bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Block driver for the QCOW version 2 format |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 24 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 25 | #include "qemu/osdep.h" |
Vladimir Sementsov-Ogievskiy | 2714f13 | 2018-06-20 17:48:36 +0300 | [diff] [blame] | 26 | |
Max Reitz | 609f45e | 2018-06-14 21:14:28 +0200 | [diff] [blame] | 27 | #include "block/qdict.h" |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 28 | #include "sysemu/block-backend.h" |
Markus Armbruster | db72581 | 2019-08-12 07:23:50 +0200 | [diff] [blame] | 29 | #include "qemu/main-loop.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 30 | #include "qemu/module.h" |
Michael S. Tsirkin | 0d8c41d | 2018-05-03 22:50:20 +0300 | [diff] [blame] | 31 | #include "qcow2.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 32 | #include "qemu/error-report.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 33 | #include "qapi/error.h" |
Markus Armbruster | 9af2398 | 2018-02-11 10:36:01 +0100 | [diff] [blame] | 34 | #include "qapi/qapi-events-block-core.h" |
Markus Armbruster | 6b67395 | 2018-02-01 12:18:35 +0100 | [diff] [blame] | 35 | #include "qapi/qmp/qdict.h" |
| 36 | #include "qapi/qmp/qstring.h" |
Kevin Wolf | 3cce16f | 2012-03-01 18:36:21 +0100 | [diff] [blame] | 37 | #include "trace.h" |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 38 | #include "qemu/option_int.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 39 | #include "qemu/cutils.h" |
Paolo Bonzini | 58369e2 | 2016-03-15 17:22:36 +0100 | [diff] [blame] | 40 | #include "qemu/bswap.h" |
Peter Maydell | 5df022c | 2022-02-26 18:07:23 +0000 | [diff] [blame] | 41 | #include "qemu/memalign.h" |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 42 | #include "qapi/qobject-input-visitor.h" |
| 43 | #include "qapi/qapi-visit-block-core.h" |
Michael S. Tsirkin | 0d8c41d | 2018-05-03 22:50:20 +0300 | [diff] [blame] | 44 | #include "crypto.h" |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 45 | #include "block/aio_task.h" |
Markus Armbruster | e2c1c34 | 2022-12-21 14:35:49 +0100 | [diff] [blame] | 46 | #include "block/dirty-bitmap.h" |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 47 | |
| 48 | /* |
| 49 | Differences with QCOW: |
| 50 | |
| 51 | - Support for multiple incremental snapshots. |
| 52 | - Memory management by reference counts. |
| 53 | - Clusters which have a reference count of one have the bit |
| 54 | QCOW_OFLAG_COPIED to optimize write performance. |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 55 | - Size of compressed clusters is stored in sectors to reduce bit usage |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 56 | in the cluster offsets. |
| 57 | - Support for storing additional data (such as the VM state) in the |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 58 | snapshots. |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 59 | - If a backing store is used, the cluster size is not constrained |
| 60 | (could be backported to QCOW). |
| 61 | - L2 tables have always a size of one cluster. |
| 62 | */ |
| 63 | |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 64 | |
| 65 | typedef struct { |
| 66 | uint32_t magic; |
| 67 | uint32_t len; |
Jeff Cody | c4217f6 | 2013-09-25 12:08:50 -0400 | [diff] [blame] | 68 | } QEMU_PACKED QCowExtension; |
Jeff Cody | 21d82ac | 2012-09-20 15:13:28 -0400 | [diff] [blame] | 69 | |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 70 | #define QCOW2_EXT_MAGIC_END 0 |
Andrey Shinkevich | 8098969 | 2020-07-17 11:14:49 +0300 | [diff] [blame] | 71 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xe2792aca |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 72 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 73 | #define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77 |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 74 | #define QCOW2_EXT_MAGIC_BITMAPS 0x23852875 |
Kevin Wolf | 93c2493 | 2019-01-14 16:48:25 +0100 | [diff] [blame] | 75 | #define QCOW2_EXT_MAGIC_DATA_FILE 0x44415441 |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 76 | |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 77 | static int coroutine_fn |
| 78 | qcow2_co_preadv_compressed(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 9a3978a | 2021-09-14 15:24:46 +0300 | [diff] [blame] | 79 | uint64_t l2_entry, |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 80 | uint64_t offset, |
| 81 | uint64_t bytes, |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 82 | QEMUIOVector *qiov, |
| 83 | size_t qiov_offset); |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 84 | |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 85 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 86 | { |
| 87 | const QCowHeader *cow_header = (const void *)buf; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 88 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 89 | if (buf_size >= sizeof(QCowHeader) && |
| 90 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 91 | be32_to_cpu(cow_header->version) >= 2) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 92 | return 100; |
| 93 | else |
| 94 | return 0; |
| 95 | } |
| 96 | |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 97 | |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 98 | static int qcow2_crypto_hdr_read_func(QCryptoBlock *block, size_t offset, |
| 99 | uint8_t *buf, size_t buflen, |
| 100 | void *opaque, Error **errp) |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 101 | { |
| 102 | BlockDriverState *bs = opaque; |
| 103 | BDRVQcow2State *s = bs->opaque; |
| 104 | ssize_t ret; |
| 105 | |
| 106 | if ((offset + buflen) > s->crypto_header.length) { |
| 107 | error_setg(errp, "Request for data outside of extension header"); |
| 108 | return -1; |
| 109 | } |
| 110 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 111 | ret = bdrv_pread(bs->file, s->crypto_header.offset + offset, buflen, buf, |
Alberto Faria | 53fb784 | 2022-06-09 16:27:35 +0100 | [diff] [blame] | 112 | 0); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 113 | if (ret < 0) { |
| 114 | error_setg_errno(errp, -ret, "Could not read encryption header"); |
| 115 | return -1; |
| 116 | } |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 117 | return 0; |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 121 | static int qcow2_crypto_hdr_init_func(QCryptoBlock *block, size_t headerlen, |
| 122 | void *opaque, Error **errp) |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 123 | { |
| 124 | BlockDriverState *bs = opaque; |
| 125 | BDRVQcow2State *s = bs->opaque; |
| 126 | int64_t ret; |
| 127 | int64_t clusterlen; |
| 128 | |
| 129 | ret = qcow2_alloc_clusters(bs, headerlen); |
| 130 | if (ret < 0) { |
| 131 | error_setg_errno(errp, -ret, |
| 132 | "Cannot allocate cluster for LUKS header size %zu", |
| 133 | headerlen); |
| 134 | return -1; |
| 135 | } |
| 136 | |
| 137 | s->crypto_header.length = headerlen; |
| 138 | s->crypto_header.offset = ret; |
| 139 | |
Daniel P. Berrangé | 087ab8e | 2020-02-07 13:55:20 +0000 | [diff] [blame] | 140 | /* |
| 141 | * Zero fill all space in cluster so it has predictable |
| 142 | * content, as we may not initialize some regions of the |
| 143 | * header (eg only 1 out of 8 key slots will be initialized) |
| 144 | */ |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 145 | clusterlen = size_to_clusters(s, headerlen) * s->cluster_size; |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 146 | assert(qcow2_pre_write_overlap_check(bs, 0, ret, clusterlen, false) == 0); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 147 | ret = bdrv_pwrite_zeroes(bs->file, |
Daniel P. Berrangé | 087ab8e | 2020-02-07 13:55:20 +0000 | [diff] [blame] | 148 | ret, |
| 149 | clusterlen, 0); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 150 | if (ret < 0) { |
| 151 | error_setg_errno(errp, -ret, "Could not zero fill encryption header"); |
| 152 | return -1; |
| 153 | } |
| 154 | |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 155 | return 0; |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 159 | static int qcow2_crypto_hdr_write_func(QCryptoBlock *block, size_t offset, |
| 160 | const uint8_t *buf, size_t buflen, |
| 161 | void *opaque, Error **errp) |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 162 | { |
| 163 | BlockDriverState *bs = opaque; |
| 164 | BDRVQcow2State *s = bs->opaque; |
| 165 | ssize_t ret; |
| 166 | |
| 167 | if ((offset + buflen) > s->crypto_header.length) { |
| 168 | error_setg(errp, "Request for data outside of extension header"); |
| 169 | return -1; |
| 170 | } |
| 171 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 172 | ret = bdrv_pwrite(bs->file, s->crypto_header.offset + offset, buflen, buf, |
Alberto Faria | 53fb784 | 2022-06-09 16:27:35 +0100 | [diff] [blame] | 173 | 0); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 174 | if (ret < 0) { |
| 175 | error_setg_errno(errp, -ret, "Could not read encryption header"); |
| 176 | return -1; |
| 177 | } |
Alberto Faria | 757dda5 | 2022-06-09 16:27:38 +0100 | [diff] [blame] | 178 | return 0; |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 179 | } |
| 180 | |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 181 | static QDict* |
| 182 | qcow2_extract_crypto_opts(QemuOpts *opts, const char *fmt, Error **errp) |
| 183 | { |
| 184 | QDict *cryptoopts_qdict; |
| 185 | QDict *opts_qdict; |
| 186 | |
| 187 | /* Extract "encrypt." options into a qdict */ |
| 188 | opts_qdict = qemu_opts_to_qdict(opts, NULL); |
| 189 | qdict_extract_subqdict(opts_qdict, &cryptoopts_qdict, "encrypt."); |
| 190 | qobject_unref(opts_qdict); |
| 191 | qdict_put_str(cryptoopts_qdict, "format", fmt); |
| 192 | return cryptoopts_qdict; |
| 193 | } |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 194 | |
Eric Blake | a951a63 | 2020-03-24 12:42:30 -0500 | [diff] [blame] | 195 | /* |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 196 | * read qcow2 extension and fill bs |
| 197 | * start reading from start_offset |
| 198 | * finish reading upon magic of value 0 or when end_offset reached |
| 199 | * unknown magic is skipped (future extension this version knows nothing about) |
| 200 | * return 0 upon success, non-0 otherwise |
| 201 | */ |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 202 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 203 | uint64_t end_offset, void **p_feature_table, |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 204 | int flags, bool *need_update_header, |
| 205 | Error **errp) |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 206 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 207 | BDRVQcow2State *s = bs->opaque; |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 208 | QCowExtension ext; |
| 209 | uint64_t offset; |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 210 | int ret; |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 211 | Qcow2BitmapHeaderExt bitmaps_ext; |
| 212 | |
| 213 | if (need_update_header != NULL) { |
| 214 | *need_update_header = false; |
| 215 | } |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 216 | |
| 217 | #ifdef DEBUG_EXT |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 218 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 219 | #endif |
| 220 | offset = start_offset; |
| 221 | while (offset < end_offset) { |
| 222 | |
| 223 | #ifdef DEBUG_EXT |
| 224 | /* Sanity check */ |
| 225 | if (offset > s->cluster_size) |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 226 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 227 | |
Dong Xu Wang | 9b2260c | 2011-11-22 18:06:25 +0800 | [diff] [blame] | 228 | printf("attempting to read extended header in offset %lu\n", offset); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 229 | #endif |
| 230 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 231 | ret = bdrv_pread(bs->file, offset, sizeof(ext), &ext, 0); |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 232 | if (ret < 0) { |
| 233 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " |
| 234 | "pread fail from offset %" PRIu64, offset); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 235 | return 1; |
| 236 | } |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 237 | ext.magic = be32_to_cpu(ext.magic); |
| 238 | ext.len = be32_to_cpu(ext.len); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 239 | offset += sizeof(ext); |
| 240 | #ifdef DEBUG_EXT |
| 241 | printf("ext.magic = 0x%x\n", ext.magic); |
| 242 | #endif |
Kevin Wolf | 2ebafc8 | 2014-11-25 18:12:40 +0100 | [diff] [blame] | 243 | if (offset > end_offset || ext.len > end_offset - offset) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 244 | error_setg(errp, "Header extension too large"); |
Kevin Wolf | 64ca6ae | 2012-02-22 12:37:13 +0100 | [diff] [blame] | 245 | return -EINVAL; |
| 246 | } |
| 247 | |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 248 | switch (ext.magic) { |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 249 | case QCOW2_EXT_MAGIC_END: |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 250 | return 0; |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 251 | |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 252 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 253 | if (ext.len >= sizeof(bs->backing_format)) { |
Max Reitz | 521b2b5 | 2014-04-29 19:03:12 +0200 | [diff] [blame] | 254 | error_setg(errp, "ERROR: ext_backing_format: len=%" PRIu32 |
| 255 | " too large (>=%zu)", ext.len, |
| 256 | sizeof(bs->backing_format)); |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 257 | return 2; |
| 258 | } |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 259 | ret = bdrv_pread(bs->file, offset, ext.len, bs->backing_format, 0); |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 260 | if (ret < 0) { |
| 261 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " |
| 262 | "Could not read format name"); |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 263 | return 3; |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 264 | } |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 265 | bs->backing_format[ext.len] = '\0'; |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 266 | s->image_backing_format = g_strdup(bs->backing_format); |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 267 | #ifdef DEBUG_EXT |
| 268 | printf("Qcow2: Got format extension %s\n", bs->backing_format); |
| 269 | #endif |
aliguori | f965509 | 2009-03-28 17:55:14 +0000 | [diff] [blame] | 270 | break; |
| 271 | |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 272 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
| 273 | if (p_feature_table != NULL) { |
shiliyang | 5f14f31 | 2020-10-30 11:35:12 +0800 | [diff] [blame] | 274 | void *feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 275 | ret = bdrv_pread(bs->file, offset, ext.len, feature_table, 0); |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 276 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 277 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
| 278 | "Could not read table"); |
lu zhipeng | 38f034e | 2022-09-21 22:45:15 +0800 | [diff] [blame] | 279 | g_free(feature_table); |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | *p_feature_table = feature_table; |
| 284 | } |
| 285 | break; |
| 286 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 287 | case QCOW2_EXT_MAGIC_CRYPTO_HEADER: { |
| 288 | unsigned int cflags = 0; |
| 289 | if (s->crypt_method_header != QCOW_CRYPT_LUKS) { |
| 290 | error_setg(errp, "CRYPTO header extension only " |
| 291 | "expected with LUKS encryption method"); |
| 292 | return -EINVAL; |
| 293 | } |
| 294 | if (ext.len != sizeof(Qcow2CryptoHeaderExtension)) { |
| 295 | error_setg(errp, "CRYPTO header extension size %u, " |
| 296 | "but expected size %zu", ext.len, |
| 297 | sizeof(Qcow2CryptoHeaderExtension)); |
| 298 | return -EINVAL; |
| 299 | } |
| 300 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 301 | ret = bdrv_pread(bs->file, offset, ext.len, &s->crypto_header, 0); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 302 | if (ret < 0) { |
| 303 | error_setg_errno(errp, -ret, |
| 304 | "Unable to read CRYPTO header extension"); |
| 305 | return ret; |
| 306 | } |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 307 | s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); |
| 308 | s->crypto_header.length = be64_to_cpu(s->crypto_header.length); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 309 | |
| 310 | if ((s->crypto_header.offset % s->cluster_size) != 0) { |
| 311 | error_setg(errp, "Encryption header offset '%" PRIu64 "' is " |
| 312 | "not a multiple of cluster size '%u'", |
| 313 | s->crypto_header.offset, s->cluster_size); |
| 314 | return -EINVAL; |
| 315 | } |
| 316 | |
| 317 | if (flags & BDRV_O_NO_IO) { |
| 318 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; |
| 319 | } |
Daniel P. Berrange | 1cd9a78 | 2017-06-23 17:24:17 +0100 | [diff] [blame] | 320 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 321 | qcow2_crypto_hdr_read_func, |
Vladimir Sementsov-Ogievskiy | 8ac0f15 | 2019-05-06 17:27:41 +0300 | [diff] [blame] | 322 | bs, cflags, QCOW2_MAX_THREADS, errp); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 323 | if (!s->crypto) { |
| 324 | return -EINVAL; |
| 325 | } |
| 326 | } break; |
| 327 | |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 328 | case QCOW2_EXT_MAGIC_BITMAPS: |
| 329 | if (ext.len != sizeof(bitmaps_ext)) { |
| 330 | error_setg_errno(errp, -ret, "bitmaps_ext: " |
| 331 | "Invalid extension length"); |
| 332 | return -EINVAL; |
| 333 | } |
| 334 | |
| 335 | if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) { |
Max Reitz | c9ceb3e | 2017-11-23 03:08:17 +0100 | [diff] [blame] | 336 | if (s->qcow_version < 3) { |
| 337 | /* Let's be a bit more specific */ |
| 338 | warn_report("This qcow2 v2 image contains bitmaps, but " |
| 339 | "they may have been modified by a program " |
| 340 | "without persistent bitmap support; so now " |
| 341 | "they must all be considered inconsistent"); |
| 342 | } else { |
| 343 | warn_report("a program lacking bitmap support " |
| 344 | "modified this file, so all bitmaps are now " |
| 345 | "considered inconsistent"); |
| 346 | } |
Alistair Francis | 55d527a | 2017-09-11 12:52:46 -0700 | [diff] [blame] | 347 | error_printf("Some clusters may be leaked, " |
| 348 | "run 'qemu-img check -r' on the image " |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 349 | "file to fix."); |
| 350 | if (need_update_header != NULL) { |
| 351 | /* Updating is needed to drop invalid bitmap extension. */ |
| 352 | *need_update_header = true; |
| 353 | } |
| 354 | break; |
| 355 | } |
| 356 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 357 | ret = bdrv_pread(bs->file, offset, ext.len, &bitmaps_ext, 0); |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 358 | if (ret < 0) { |
| 359 | error_setg_errno(errp, -ret, "bitmaps_ext: " |
| 360 | "Could not read ext header"); |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | if (bitmaps_ext.reserved32 != 0) { |
| 365 | error_setg_errno(errp, -ret, "bitmaps_ext: " |
| 366 | "Reserved field is not zero"); |
| 367 | return -EINVAL; |
| 368 | } |
| 369 | |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 370 | bitmaps_ext.nb_bitmaps = be32_to_cpu(bitmaps_ext.nb_bitmaps); |
| 371 | bitmaps_ext.bitmap_directory_size = |
| 372 | be64_to_cpu(bitmaps_ext.bitmap_directory_size); |
| 373 | bitmaps_ext.bitmap_directory_offset = |
| 374 | be64_to_cpu(bitmaps_ext.bitmap_directory_offset); |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 375 | |
| 376 | if (bitmaps_ext.nb_bitmaps > QCOW2_MAX_BITMAPS) { |
| 377 | error_setg(errp, |
| 378 | "bitmaps_ext: Image has %" PRIu32 " bitmaps, " |
| 379 | "exceeding the QEMU supported maximum of %d", |
| 380 | bitmaps_ext.nb_bitmaps, QCOW2_MAX_BITMAPS); |
| 381 | return -EINVAL; |
| 382 | } |
| 383 | |
| 384 | if (bitmaps_ext.nb_bitmaps == 0) { |
| 385 | error_setg(errp, "found bitmaps extension with zero bitmaps"); |
| 386 | return -EINVAL; |
| 387 | } |
| 388 | |
Alberto Garcia | 74e60fb | 2019-12-12 12:01:21 +0200 | [diff] [blame] | 389 | if (offset_into_cluster(s, bitmaps_ext.bitmap_directory_offset)) { |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 390 | error_setg(errp, "bitmaps_ext: " |
| 391 | "invalid bitmap directory offset"); |
| 392 | return -EINVAL; |
| 393 | } |
| 394 | |
| 395 | if (bitmaps_ext.bitmap_directory_size > |
| 396 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { |
| 397 | error_setg(errp, "bitmaps_ext: " |
| 398 | "bitmap directory size (%" PRIu64 ") exceeds " |
| 399 | "the maximum supported size (%d)", |
| 400 | bitmaps_ext.bitmap_directory_size, |
| 401 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE); |
| 402 | return -EINVAL; |
| 403 | } |
| 404 | |
| 405 | s->nb_bitmaps = bitmaps_ext.nb_bitmaps; |
| 406 | s->bitmap_directory_offset = |
| 407 | bitmaps_ext.bitmap_directory_offset; |
| 408 | s->bitmap_directory_size = |
| 409 | bitmaps_ext.bitmap_directory_size; |
| 410 | |
| 411 | #ifdef DEBUG_EXT |
| 412 | printf("Qcow2: Got bitmaps extension: " |
| 413 | "offset=%" PRIu64 " nb_bitmaps=%" PRIu32 "\n", |
| 414 | s->bitmap_directory_offset, s->nb_bitmaps); |
| 415 | #endif |
| 416 | break; |
| 417 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 418 | case QCOW2_EXT_MAGIC_DATA_FILE: |
| 419 | { |
| 420 | s->image_data_file = g_malloc0(ext.len + 1); |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 421 | ret = bdrv_pread(bs->file, offset, ext.len, s->image_data_file, 0); |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 422 | if (ret < 0) { |
| 423 | error_setg_errno(errp, -ret, |
| 424 | "ERROR: Could not read data file name"); |
| 425 | return ret; |
| 426 | } |
| 427 | #ifdef DEBUG_EXT |
| 428 | printf("Qcow2: Got external data file %s\n", s->image_data_file); |
| 429 | #endif |
| 430 | break; |
| 431 | } |
| 432 | |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 433 | default: |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 434 | /* unknown magic - save it in case we need to rewrite the header */ |
Eric Blake | 4096974 | 2017-11-17 10:47:47 -0600 | [diff] [blame] | 435 | /* If you add a new feature, make sure to also update the fast |
| 436 | * path of qcow2_make_empty() to deal with it. */ |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 437 | { |
| 438 | Qcow2UnknownHeaderExtension *uext; |
| 439 | |
| 440 | uext = g_malloc0(sizeof(*uext) + ext.len); |
| 441 | uext->magic = ext.magic; |
| 442 | uext->len = ext.len; |
| 443 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); |
| 444 | |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 445 | ret = bdrv_pread(bs->file, offset, uext->len, uext->data, 0); |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 446 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 447 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
| 448 | "Could not read data"); |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 449 | return ret; |
| 450 | } |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 451 | } |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 452 | break; |
| 453 | } |
Kevin Wolf | fd29b4b | 2012-02-22 12:31:47 +0100 | [diff] [blame] | 454 | |
| 455 | offset += ((ext.len + 7) & ~7); |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | return 0; |
| 459 | } |
| 460 | |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 461 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
| 462 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 463 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 464 | Qcow2UnknownHeaderExtension *uext, *next; |
| 465 | |
| 466 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { |
| 467 | QLIST_REMOVE(uext, next); |
| 468 | g_free(uext); |
| 469 | } |
| 470 | } |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 471 | |
Max Reitz | a55448b | 2016-03-16 19:54:33 +0100 | [diff] [blame] | 472 | static void report_unsupported_feature(Error **errp, Qcow2Feature *table, |
| 473 | uint64_t mask) |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 474 | { |
Alberto Garcia | 7cdca2e | 2020-01-15 14:56:26 +0100 | [diff] [blame] | 475 | g_autoptr(GString) features = g_string_sized_new(60); |
Kevin Wolf | 12ac6d3 | 2014-07-17 11:41:53 +0200 | [diff] [blame] | 476 | |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 477 | while (table && table->name[0] != '\0') { |
| 478 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { |
Kevin Wolf | 12ac6d3 | 2014-07-17 11:41:53 +0200 | [diff] [blame] | 479 | if (mask & (1ULL << table->bit)) { |
Alberto Garcia | 7cdca2e | 2020-01-15 14:56:26 +0100 | [diff] [blame] | 480 | if (features->len > 0) { |
| 481 | g_string_append(features, ", "); |
| 482 | } |
| 483 | g_string_append_printf(features, "%.46s", table->name); |
Kevin Wolf | 12ac6d3 | 2014-07-17 11:41:53 +0200 | [diff] [blame] | 484 | mask &= ~(1ULL << table->bit); |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 485 | } |
| 486 | } |
| 487 | table++; |
| 488 | } |
| 489 | |
| 490 | if (mask) { |
Alberto Garcia | 7cdca2e | 2020-01-15 14:56:26 +0100 | [diff] [blame] | 491 | if (features->len > 0) { |
| 492 | g_string_append(features, ", "); |
| 493 | } |
| 494 | g_string_append_printf(features, |
| 495 | "Unknown incompatible feature: %" PRIx64, mask); |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 496 | } |
Kevin Wolf | 12ac6d3 | 2014-07-17 11:41:53 +0200 | [diff] [blame] | 497 | |
Alberto Garcia | 7cdca2e | 2020-01-15 14:56:26 +0100 | [diff] [blame] | 498 | error_setg(errp, "Unsupported qcow2 feature(s): %s", features->str); |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 499 | } |
| 500 | |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 501 | /* |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 502 | * Sets the dirty bit and flushes afterwards if necessary. |
| 503 | * |
| 504 | * The incompatible_features bit is only set if the image file header was |
| 505 | * updated successfully. Therefore it is not required to check the return |
| 506 | * value of this function. |
| 507 | */ |
Kevin Wolf | 280d373 | 2012-12-07 18:08:47 +0100 | [diff] [blame] | 508 | int qcow2_mark_dirty(BlockDriverState *bs) |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 509 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 510 | BDRVQcow2State *s = bs->opaque; |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 511 | uint64_t val; |
| 512 | int ret; |
| 513 | |
| 514 | assert(s->qcow_version >= 3); |
| 515 | |
| 516 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { |
| 517 | return 0; /* already dirty */ |
| 518 | } |
| 519 | |
| 520 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); |
Alberto Faria | 86da432 | 2022-06-09 16:27:44 +0100 | [diff] [blame] | 521 | ret = bdrv_pwrite_sync(bs->file, |
| 522 | offsetof(QCowHeader, incompatible_features), |
| 523 | sizeof(val), &val, 0); |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 524 | if (ret < 0) { |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | /* Only treat image as dirty if the header was updated successfully */ |
| 529 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | /* |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 534 | * Clears the dirty bit and flushes before if necessary. Only call this |
| 535 | * function when there are no pending requests, it does not guard against |
| 536 | * concurrent requests dirtying the image. |
| 537 | */ |
| 538 | static int qcow2_mark_clean(BlockDriverState *bs) |
| 539 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 540 | BDRVQcow2State *s = bs->opaque; |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 541 | |
| 542 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 543 | int ret; |
| 544 | |
| 545 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; |
| 546 | |
Paolo Bonzini | 8b220eb | 2018-03-01 17:36:14 +0100 | [diff] [blame] | 547 | ret = qcow2_flush_caches(bs); |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 548 | if (ret < 0) { |
| 549 | return ret; |
| 550 | } |
| 551 | |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 552 | return qcow2_update_header(bs); |
| 553 | } |
| 554 | return 0; |
| 555 | } |
| 556 | |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 557 | /* |
| 558 | * Marks the image as corrupt. |
| 559 | */ |
| 560 | int qcow2_mark_corrupt(BlockDriverState *bs) |
| 561 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 562 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 563 | |
| 564 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; |
| 565 | return qcow2_update_header(bs); |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes |
| 570 | * before if necessary. |
| 571 | */ |
| 572 | int qcow2_mark_consistent(BlockDriverState *bs) |
| 573 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 574 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 575 | |
| 576 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
Paolo Bonzini | 8b220eb | 2018-03-01 17:36:14 +0100 | [diff] [blame] | 577 | int ret = qcow2_flush_caches(bs); |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 578 | if (ret < 0) { |
| 579 | return ret; |
| 580 | } |
| 581 | |
| 582 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; |
| 583 | return qcow2_update_header(bs); |
| 584 | } |
| 585 | return 0; |
| 586 | } |
| 587 | |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 588 | static void qcow2_add_check_result(BdrvCheckResult *out, |
| 589 | const BdrvCheckResult *src, |
| 590 | bool set_allocation_info) |
| 591 | { |
| 592 | out->corruptions += src->corruptions; |
| 593 | out->leaks += src->leaks; |
| 594 | out->check_errors += src->check_errors; |
| 595 | out->corruptions_fixed += src->corruptions_fixed; |
| 596 | out->leaks_fixed += src->leaks_fixed; |
| 597 | |
| 598 | if (set_allocation_info) { |
| 599 | out->image_end_offset = src->image_end_offset; |
| 600 | out->bfi = src->bfi; |
| 601 | } |
| 602 | } |
| 603 | |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 604 | static int coroutine_fn qcow2_co_check_locked(BlockDriverState *bs, |
| 605 | BdrvCheckResult *result, |
| 606 | BdrvCheckMode fix) |
Stefan Hajnoczi | acbe598 | 2012-08-09 13:05:55 +0100 | [diff] [blame] | 607 | { |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 608 | BdrvCheckResult snapshot_res = {}; |
| 609 | BdrvCheckResult refcount_res = {}; |
| 610 | int ret; |
| 611 | |
| 612 | memset(result, 0, sizeof(*result)); |
| 613 | |
| 614 | ret = qcow2_check_read_snapshot_table(bs, &snapshot_res, fix); |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 615 | if (ret < 0) { |
Max Reitz | fe446b5 | 2019-10-11 17:28:07 +0200 | [diff] [blame] | 616 | qcow2_add_check_result(result, &snapshot_res, false); |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 617 | return ret; |
| 618 | } |
| 619 | |
| 620 | ret = qcow2_check_refcounts(bs, &refcount_res, fix); |
| 621 | qcow2_add_check_result(result, &refcount_res, true); |
Stefan Hajnoczi | acbe598 | 2012-08-09 13:05:55 +0100 | [diff] [blame] | 622 | if (ret < 0) { |
Max Reitz | fe446b5 | 2019-10-11 17:28:07 +0200 | [diff] [blame] | 623 | qcow2_add_check_result(result, &snapshot_res, false); |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | ret = qcow2_check_fix_snapshot_table(bs, &snapshot_res, fix); |
| 628 | qcow2_add_check_result(result, &snapshot_res, false); |
| 629 | if (ret < 0) { |
Stefan Hajnoczi | acbe598 | 2012-08-09 13:05:55 +0100 | [diff] [blame] | 630 | return ret; |
| 631 | } |
| 632 | |
| 633 | if (fix && result->check_errors == 0 && result->corruptions == 0) { |
Max Reitz | 24530f3 | 2013-08-30 14:34:30 +0200 | [diff] [blame] | 634 | ret = qcow2_mark_clean(bs); |
| 635 | if (ret < 0) { |
| 636 | return ret; |
| 637 | } |
| 638 | return qcow2_mark_consistent(bs); |
Stefan Hajnoczi | acbe598 | 2012-08-09 13:05:55 +0100 | [diff] [blame] | 639 | } |
| 640 | return ret; |
| 641 | } |
| 642 | |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 643 | static int coroutine_fn qcow2_co_check(BlockDriverState *bs, |
| 644 | BdrvCheckResult *result, |
| 645 | BdrvCheckMode fix) |
| 646 | { |
| 647 | BDRVQcow2State *s = bs->opaque; |
| 648 | int ret; |
| 649 | |
| 650 | qemu_co_mutex_lock(&s->lock); |
| 651 | ret = qcow2_co_check_locked(bs, result, fix); |
| 652 | qemu_co_mutex_unlock(&s->lock); |
| 653 | return ret; |
| 654 | } |
| 655 | |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 656 | int qcow2_validate_table(BlockDriverState *bs, uint64_t offset, |
| 657 | uint64_t entries, size_t entry_len, |
| 658 | int64_t max_size_bytes, const char *table_name, |
| 659 | Error **errp) |
Kevin Wolf | 8c7de28 | 2014-03-26 13:05:44 +0100 | [diff] [blame] | 660 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 661 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 662 | |
| 663 | if (entries > max_size_bytes / entry_len) { |
| 664 | error_setg(errp, "%s too large", table_name); |
| 665 | return -EFBIG; |
| 666 | } |
Kevin Wolf | 8c7de28 | 2014-03-26 13:05:44 +0100 | [diff] [blame] | 667 | |
| 668 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, |
| 669 | * because values will be passed to qemu functions taking int64_t. */ |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 670 | if ((INT64_MAX - entries * entry_len < offset) || |
| 671 | (offset_into_cluster(s, offset) != 0)) { |
| 672 | error_setg(errp, "%s offset invalid", table_name); |
Kevin Wolf | 8c7de28 | 2014-03-26 13:05:44 +0100 | [diff] [blame] | 673 | return -EINVAL; |
| 674 | } |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
Alberto Garcia | 8a2ce0b | 2019-03-12 18:48:48 +0200 | [diff] [blame] | 679 | static const char *const mutable_opts[] = { |
| 680 | QCOW2_OPT_LAZY_REFCOUNTS, |
| 681 | QCOW2_OPT_DISCARD_REQUEST, |
| 682 | QCOW2_OPT_DISCARD_SNAPSHOT, |
| 683 | QCOW2_OPT_DISCARD_OTHER, |
| 684 | QCOW2_OPT_OVERLAP, |
| 685 | QCOW2_OPT_OVERLAP_TEMPLATE, |
| 686 | QCOW2_OPT_OVERLAP_MAIN_HEADER, |
| 687 | QCOW2_OPT_OVERLAP_ACTIVE_L1, |
| 688 | QCOW2_OPT_OVERLAP_ACTIVE_L2, |
| 689 | QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, |
| 690 | QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, |
| 691 | QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, |
| 692 | QCOW2_OPT_OVERLAP_INACTIVE_L1, |
| 693 | QCOW2_OPT_OVERLAP_INACTIVE_L2, |
| 694 | QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, |
| 695 | QCOW2_OPT_CACHE_SIZE, |
| 696 | QCOW2_OPT_L2_CACHE_SIZE, |
| 697 | QCOW2_OPT_L2_CACHE_ENTRY_SIZE, |
| 698 | QCOW2_OPT_REFCOUNT_CACHE_SIZE, |
| 699 | QCOW2_OPT_CACHE_CLEAN_INTERVAL, |
| 700 | NULL |
| 701 | }; |
| 702 | |
Kevin Wolf | 74c4510 | 2013-03-15 10:35:08 +0100 | [diff] [blame] | 703 | static QemuOptsList qcow2_runtime_opts = { |
| 704 | .name = "qcow2", |
| 705 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), |
| 706 | .desc = { |
| 707 | { |
Kevin Wolf | 64aa99d | 2013-07-17 14:45:34 +0200 | [diff] [blame] | 708 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
Kevin Wolf | 74c4510 | 2013-03-15 10:35:08 +0100 | [diff] [blame] | 709 | .type = QEMU_OPT_BOOL, |
| 710 | .help = "Postpone refcount updates", |
| 711 | }, |
Kevin Wolf | 67af674 | 2013-06-19 13:44:19 +0200 | [diff] [blame] | 712 | { |
| 713 | .name = QCOW2_OPT_DISCARD_REQUEST, |
| 714 | .type = QEMU_OPT_BOOL, |
| 715 | .help = "Pass guest discard requests to the layer below", |
| 716 | }, |
| 717 | { |
| 718 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, |
| 719 | .type = QEMU_OPT_BOOL, |
| 720 | .help = "Generate discard requests when snapshot related space " |
| 721 | "is freed", |
| 722 | }, |
| 723 | { |
| 724 | .name = QCOW2_OPT_DISCARD_OTHER, |
| 725 | .type = QEMU_OPT_BOOL, |
| 726 | .help = "Generate discard requests when other clusters are freed", |
| 727 | }, |
Max Reitz | 05de7e8 | 2013-10-10 11:09:25 +0200 | [diff] [blame] | 728 | { |
| 729 | .name = QCOW2_OPT_OVERLAP, |
| 730 | .type = QEMU_OPT_STRING, |
| 731 | .help = "Selects which overlap checks to perform from a range of " |
| 732 | "templates (none, constant, cached, all)", |
| 733 | }, |
| 734 | { |
Max Reitz | ee42b5c | 2014-08-20 19:59:35 +0200 | [diff] [blame] | 735 | .name = QCOW2_OPT_OVERLAP_TEMPLATE, |
| 736 | .type = QEMU_OPT_STRING, |
| 737 | .help = "Selects which overlap checks to perform from a range of " |
| 738 | "templates (none, constant, cached, all)", |
| 739 | }, |
| 740 | { |
Max Reitz | 05de7e8 | 2013-10-10 11:09:25 +0200 | [diff] [blame] | 741 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, |
| 742 | .type = QEMU_OPT_BOOL, |
| 743 | .help = "Check for unintended writes into the main qcow2 header", |
| 744 | }, |
| 745 | { |
| 746 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, |
| 747 | .type = QEMU_OPT_BOOL, |
| 748 | .help = "Check for unintended writes into the active L1 table", |
| 749 | }, |
| 750 | { |
| 751 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, |
| 752 | .type = QEMU_OPT_BOOL, |
| 753 | .help = "Check for unintended writes into an active L2 table", |
| 754 | }, |
| 755 | { |
| 756 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, |
| 757 | .type = QEMU_OPT_BOOL, |
| 758 | .help = "Check for unintended writes into the refcount table", |
| 759 | }, |
| 760 | { |
| 761 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, |
| 762 | .type = QEMU_OPT_BOOL, |
| 763 | .help = "Check for unintended writes into a refcount block", |
| 764 | }, |
| 765 | { |
| 766 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, |
| 767 | .type = QEMU_OPT_BOOL, |
| 768 | .help = "Check for unintended writes into the snapshot table", |
| 769 | }, |
| 770 | { |
| 771 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, |
| 772 | .type = QEMU_OPT_BOOL, |
| 773 | .help = "Check for unintended writes into an inactive L1 table", |
| 774 | }, |
| 775 | { |
| 776 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, |
| 777 | .type = QEMU_OPT_BOOL, |
| 778 | .help = "Check for unintended writes into an inactive L2 table", |
| 779 | }, |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 780 | { |
Vladimir Sementsov-Ogievskiy | 0e4e431 | 2018-07-05 18:15:15 +0300 | [diff] [blame] | 781 | .name = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, |
| 782 | .type = QEMU_OPT_BOOL, |
| 783 | .help = "Check for unintended writes into the bitmap directory", |
| 784 | }, |
| 785 | { |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 786 | .name = QCOW2_OPT_CACHE_SIZE, |
| 787 | .type = QEMU_OPT_SIZE, |
| 788 | .help = "Maximum combined metadata (L2 tables and refcount blocks) " |
| 789 | "cache size", |
| 790 | }, |
| 791 | { |
| 792 | .name = QCOW2_OPT_L2_CACHE_SIZE, |
| 793 | .type = QEMU_OPT_SIZE, |
| 794 | .help = "Maximum L2 table cache size", |
| 795 | }, |
| 796 | { |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 797 | .name = QCOW2_OPT_L2_CACHE_ENTRY_SIZE, |
| 798 | .type = QEMU_OPT_SIZE, |
| 799 | .help = "Size of each entry in the L2 cache", |
| 800 | }, |
| 801 | { |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 802 | .name = QCOW2_OPT_REFCOUNT_CACHE_SIZE, |
| 803 | .type = QEMU_OPT_SIZE, |
| 804 | .help = "Maximum refcount block cache size", |
| 805 | }, |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 806 | { |
| 807 | .name = QCOW2_OPT_CACHE_CLEAN_INTERVAL, |
| 808 | .type = QEMU_OPT_NUMBER, |
| 809 | .help = "Clean unused cache entries after this time (in seconds)", |
| 810 | }, |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 811 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", |
| 812 | "ID of secret providing qcow2 AES key or LUKS passphrase"), |
Kevin Wolf | 74c4510 | 2013-03-15 10:35:08 +0100 | [diff] [blame] | 813 | { /* end of list */ } |
| 814 | }, |
| 815 | }; |
| 816 | |
Max Reitz | 4092e99 | 2013-10-10 11:09:26 +0200 | [diff] [blame] | 817 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
Vladimir Sementsov-Ogievskiy | 0e4e431 | 2018-07-05 18:15:15 +0300 | [diff] [blame] | 818 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, |
| 819 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, |
| 820 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, |
| 821 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, |
| 822 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, |
| 823 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, |
| 824 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, |
| 825 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, |
| 826 | [QCOW2_OL_BITMAP_DIRECTORY_BITNR] = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, |
Max Reitz | 4092e99 | 2013-10-10 11:09:26 +0200 | [diff] [blame] | 827 | }; |
| 828 | |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 829 | static void cache_clean_timer_cb(void *opaque) |
| 830 | { |
| 831 | BlockDriverState *bs = opaque; |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 832 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | b2f68bf | 2018-02-05 16:33:09 +0200 | [diff] [blame] | 833 | qcow2_cache_clean_unused(s->l2_table_cache); |
| 834 | qcow2_cache_clean_unused(s->refcount_block_cache); |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 835 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + |
| 836 | (int64_t) s->cache_clean_interval * 1000); |
| 837 | } |
| 838 | |
| 839 | static void cache_clean_timer_init(BlockDriverState *bs, AioContext *context) |
| 840 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 841 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 842 | if (s->cache_clean_interval > 0) { |
Pavel Dovgalyuk | ad0ce64 | 2021-03-29 11:06:03 +0300 | [diff] [blame] | 843 | s->cache_clean_timer = |
| 844 | aio_timer_new_with_attrs(context, QEMU_CLOCK_VIRTUAL, |
| 845 | SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, |
| 846 | cache_clean_timer_cb, bs); |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 847 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + |
| 848 | (int64_t) s->cache_clean_interval * 1000); |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | static void cache_clean_timer_del(BlockDriverState *bs) |
| 853 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 854 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 855 | if (s->cache_clean_timer) { |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 856 | timer_free(s->cache_clean_timer); |
| 857 | s->cache_clean_timer = NULL; |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | static void qcow2_detach_aio_context(BlockDriverState *bs) |
| 862 | { |
| 863 | cache_clean_timer_del(bs); |
| 864 | } |
| 865 | |
| 866 | static void qcow2_attach_aio_context(BlockDriverState *bs, |
| 867 | AioContext *new_context) |
| 868 | { |
| 869 | cache_clean_timer_init(bs, new_context); |
| 870 | } |
| 871 | |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 872 | static bool read_cache_sizes(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | bc85ef2 | 2015-06-01 18:09:19 +0200 | [diff] [blame] | 873 | uint64_t *l2_cache_size, |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 874 | uint64_t *l2_cache_entry_size, |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 875 | uint64_t *refcount_cache_size, Error **errp) |
| 876 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 877 | BDRVQcow2State *s = bs->opaque; |
Leonid Bloch | b749562 | 2018-09-26 19:04:43 +0300 | [diff] [blame] | 878 | uint64_t combined_cache_size, l2_cache_max_setting; |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 879 | bool l2_cache_size_set, refcount_cache_size_set, combined_cache_size_set; |
Alberto Garcia | af39bd0 | 2019-02-13 18:48:53 +0200 | [diff] [blame] | 880 | bool l2_cache_entry_size_set; |
Alberto Garcia | 7af5eea | 2018-05-28 17:01:28 +0200 | [diff] [blame] | 881 | int min_refcount_cache = MIN_REFCOUNT_CACHE_SIZE * s->cluster_size; |
Leonid Bloch | b749562 | 2018-09-26 19:04:43 +0300 | [diff] [blame] | 882 | uint64_t virtual_disk_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
Alberto Garcia | b70d082 | 2019-08-16 15:17:42 +0300 | [diff] [blame] | 883 | uint64_t max_l2_entries = DIV_ROUND_UP(virtual_disk_size, s->cluster_size); |
| 884 | /* An L2 table is always one cluster in size so the max cache size |
| 885 | * should be a multiple of the cluster size. */ |
Alberto Garcia | c8fd855 | 2020-07-10 18:12:54 +0200 | [diff] [blame] | 886 | uint64_t max_l2_cache = ROUND_UP(max_l2_entries * l2_entry_size(s), |
Alberto Garcia | b70d082 | 2019-08-16 15:17:42 +0300 | [diff] [blame] | 887 | s->cluster_size); |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 888 | |
| 889 | combined_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_CACHE_SIZE); |
| 890 | l2_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_SIZE); |
| 891 | refcount_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_REFCOUNT_CACHE_SIZE); |
Alberto Garcia | af39bd0 | 2019-02-13 18:48:53 +0200 | [diff] [blame] | 892 | l2_cache_entry_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_ENTRY_SIZE); |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 893 | |
| 894 | combined_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_CACHE_SIZE, 0); |
Leonid Bloch | b749562 | 2018-09-26 19:04:43 +0300 | [diff] [blame] | 895 | l2_cache_max_setting = qemu_opt_get_size(opts, QCOW2_OPT_L2_CACHE_SIZE, |
| 896 | DEFAULT_L2_CACHE_MAX_SIZE); |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 897 | *refcount_cache_size = qemu_opt_get_size(opts, |
| 898 | QCOW2_OPT_REFCOUNT_CACHE_SIZE, 0); |
| 899 | |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 900 | *l2_cache_entry_size = qemu_opt_get_size( |
| 901 | opts, QCOW2_OPT_L2_CACHE_ENTRY_SIZE, s->cluster_size); |
| 902 | |
Leonid Bloch | b749562 | 2018-09-26 19:04:43 +0300 | [diff] [blame] | 903 | *l2_cache_size = MIN(max_l2_cache, l2_cache_max_setting); |
| 904 | |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 905 | if (combined_cache_size_set) { |
| 906 | if (l2_cache_size_set && refcount_cache_size_set) { |
| 907 | error_setg(errp, QCOW2_OPT_CACHE_SIZE ", " QCOW2_OPT_L2_CACHE_SIZE |
| 908 | " and " QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not be set " |
Leonid Bloch | 308999e | 2018-07-25 17:27:55 +0300 | [diff] [blame] | 909 | "at the same time"); |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 910 | return false; |
Leonid Bloch | b749562 | 2018-09-26 19:04:43 +0300 | [diff] [blame] | 911 | } else if (l2_cache_size_set && |
| 912 | (l2_cache_max_setting > combined_cache_size)) { |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 913 | error_setg(errp, QCOW2_OPT_L2_CACHE_SIZE " may not exceed " |
| 914 | QCOW2_OPT_CACHE_SIZE); |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 915 | return false; |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 916 | } else if (*refcount_cache_size > combined_cache_size) { |
| 917 | error_setg(errp, QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not exceed " |
| 918 | QCOW2_OPT_CACHE_SIZE); |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 919 | return false; |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | if (l2_cache_size_set) { |
| 923 | *refcount_cache_size = combined_cache_size - *l2_cache_size; |
| 924 | } else if (refcount_cache_size_set) { |
| 925 | *l2_cache_size = combined_cache_size - *refcount_cache_size; |
| 926 | } else { |
Alberto Garcia | 5225399 | 2018-04-17 15:37:04 +0300 | [diff] [blame] | 927 | /* Assign as much memory as possible to the L2 cache, and |
| 928 | * use the remainder for the refcount cache */ |
| 929 | if (combined_cache_size >= max_l2_cache + min_refcount_cache) { |
| 930 | *l2_cache_size = max_l2_cache; |
| 931 | *refcount_cache_size = combined_cache_size - *l2_cache_size; |
| 932 | } else { |
| 933 | *refcount_cache_size = |
| 934 | MIN(combined_cache_size, min_refcount_cache); |
| 935 | *l2_cache_size = combined_cache_size - *refcount_cache_size; |
| 936 | } |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 937 | } |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 938 | } |
Alberto Garcia | af39bd0 | 2019-02-13 18:48:53 +0200 | [diff] [blame] | 939 | |
| 940 | /* |
| 941 | * If the L2 cache is not enough to cover the whole disk then |
| 942 | * default to 4KB entries. Smaller entries reduce the cost of |
| 943 | * loads and evictions and increase I/O performance. |
| 944 | */ |
| 945 | if (*l2_cache_size < max_l2_cache && !l2_cache_entry_size_set) { |
| 946 | *l2_cache_entry_size = MIN(s->cluster_size, 4096); |
| 947 | } |
| 948 | |
Leonid Bloch | 657ada5 | 2018-09-26 19:04:42 +0300 | [diff] [blame] | 949 | /* l2_cache_size and refcount_cache_size are ensured to have at least |
| 950 | * their minimum values in qcow2_update_options_prepare() */ |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 951 | |
| 952 | if (*l2_cache_entry_size < (1 << MIN_CLUSTER_BITS) || |
| 953 | *l2_cache_entry_size > s->cluster_size || |
| 954 | !is_power_of_2(*l2_cache_entry_size)) { |
| 955 | error_setg(errp, "L2 cache entry size must be a power of two " |
| 956 | "between %d and the cluster size (%d)", |
| 957 | 1 << MIN_CLUSTER_BITS, s->cluster_size); |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 958 | return false; |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 959 | } |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 960 | |
| 961 | return true; |
Max Reitz | 6c1c8d5 | 2014-08-18 22:07:33 +0200 | [diff] [blame] | 962 | } |
| 963 | |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 964 | typedef struct Qcow2ReopenState { |
| 965 | Qcow2Cache *l2_table_cache; |
| 966 | Qcow2Cache *refcount_block_cache; |
Alberto Garcia | 3c2e511 | 2018-02-05 16:33:13 +0200 | [diff] [blame] | 967 | int l2_slice_size; /* Number of entries in a slice of the L2 table */ |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 968 | bool use_lazy_refcounts; |
| 969 | int overlap_check; |
| 970 | bool discard_passthrough[QCOW2_DISCARD_MAX]; |
| 971 | uint64_t cache_clean_interval; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 972 | QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */ |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 973 | } Qcow2ReopenState; |
| 974 | |
| 975 | static int qcow2_update_options_prepare(BlockDriverState *bs, |
| 976 | Qcow2ReopenState *r, |
| 977 | QDict *options, int flags, |
| 978 | Error **errp) |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 979 | { |
| 980 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 981 | QemuOpts *opts = NULL; |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 982 | const char *opt_overlap_check, *opt_overlap_check_template; |
| 983 | int overlap_check_template = 0; |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 984 | uint64_t l2_cache_size, l2_cache_entry_size, refcount_cache_size; |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 985 | int i; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 986 | const char *encryptfmt; |
| 987 | QDict *encryptopts = NULL; |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 988 | int ret; |
| 989 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 990 | qdict_extract_subqdict(options, &encryptopts, "encrypt."); |
| 991 | encryptfmt = qdict_get_try_str(encryptopts, "format"); |
| 992 | |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 993 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 994 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 995 | ret = -EINVAL; |
| 996 | goto fail; |
| 997 | } |
| 998 | |
| 999 | /* get L2 table/refcount block cache size from command line options */ |
Vladimir Sementsov-Ogievskiy | 772c4ca | 2021-02-02 15:49:53 +0300 | [diff] [blame] | 1000 | if (!read_cache_sizes(bs, opts, &l2_cache_size, &l2_cache_entry_size, |
| 1001 | &refcount_cache_size, errp)) { |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1002 | ret = -EINVAL; |
| 1003 | goto fail; |
| 1004 | } |
| 1005 | |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 1006 | l2_cache_size /= l2_cache_entry_size; |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1007 | if (l2_cache_size < MIN_L2_CACHE_SIZE) { |
| 1008 | l2_cache_size = MIN_L2_CACHE_SIZE; |
| 1009 | } |
| 1010 | if (l2_cache_size > INT_MAX) { |
| 1011 | error_setg(errp, "L2 cache size too big"); |
| 1012 | ret = -EINVAL; |
| 1013 | goto fail; |
| 1014 | } |
| 1015 | |
| 1016 | refcount_cache_size /= s->cluster_size; |
| 1017 | if (refcount_cache_size < MIN_REFCOUNT_CACHE_SIZE) { |
| 1018 | refcount_cache_size = MIN_REFCOUNT_CACHE_SIZE; |
| 1019 | } |
| 1020 | if (refcount_cache_size > INT_MAX) { |
| 1021 | error_setg(errp, "Refcount cache size too big"); |
| 1022 | ret = -EINVAL; |
| 1023 | goto fail; |
| 1024 | } |
| 1025 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1026 | /* alloc new L2 table/refcount block cache, flush old one */ |
| 1027 | if (s->l2_table_cache) { |
| 1028 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
| 1029 | if (ret) { |
| 1030 | error_setg_errno(errp, -ret, "Failed to flush the L2 table cache"); |
| 1031 | goto fail; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | if (s->refcount_block_cache) { |
| 1036 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); |
| 1037 | if (ret) { |
| 1038 | error_setg_errno(errp, -ret, |
| 1039 | "Failed to flush the refcount block cache"); |
| 1040 | goto fail; |
| 1041 | } |
| 1042 | } |
| 1043 | |
Alberto Garcia | c8fd855 | 2020-07-10 18:12:54 +0200 | [diff] [blame] | 1044 | r->l2_slice_size = l2_cache_entry_size / l2_entry_size(s); |
Alberto Garcia | 1221fe6 | 2018-02-05 16:33:36 +0200 | [diff] [blame] | 1045 | r->l2_table_cache = qcow2_cache_create(bs, l2_cache_size, |
| 1046 | l2_cache_entry_size); |
| 1047 | r->refcount_block_cache = qcow2_cache_create(bs, refcount_cache_size, |
| 1048 | s->cluster_size); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1049 | if (r->l2_table_cache == NULL || r->refcount_block_cache == NULL) { |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1050 | error_setg(errp, "Could not allocate metadata caches"); |
| 1051 | ret = -ENOMEM; |
| 1052 | goto fail; |
| 1053 | } |
| 1054 | |
| 1055 | /* New interval for cache cleanup timer */ |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1056 | r->cache_clean_interval = |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1057 | qemu_opt_get_number(opts, QCOW2_OPT_CACHE_CLEAN_INTERVAL, |
Leonid Bloch | e957b50 | 2018-09-26 19:04:46 +0300 | [diff] [blame] | 1058 | DEFAULT_CACHE_CLEAN_INTERVAL); |
Alberto Garcia | 91203f0 | 2016-11-25 13:27:44 +0200 | [diff] [blame] | 1059 | #ifndef CONFIG_LINUX |
| 1060 | if (r->cache_clean_interval != 0) { |
| 1061 | error_setg(errp, QCOW2_OPT_CACHE_CLEAN_INTERVAL |
| 1062 | " not supported on this host"); |
| 1063 | ret = -EINVAL; |
| 1064 | goto fail; |
| 1065 | } |
| 1066 | #endif |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1067 | if (r->cache_clean_interval > UINT_MAX) { |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1068 | error_setg(errp, "Cache clean interval too big"); |
| 1069 | ret = -EINVAL; |
| 1070 | goto fail; |
| 1071 | } |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1072 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1073 | /* lazy-refcounts; flush if going from enabled to disabled */ |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1074 | r->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1075 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1076 | if (r->use_lazy_refcounts && s->qcow_version < 3) { |
Kevin Wolf | 007dbc3 | 2015-04-16 13:11:39 +0200 | [diff] [blame] | 1077 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
| 1078 | "qemu 1.1 compatibility level"); |
| 1079 | ret = -EINVAL; |
| 1080 | goto fail; |
| 1081 | } |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1082 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1083 | if (s->use_lazy_refcounts && !r->use_lazy_refcounts) { |
| 1084 | ret = qcow2_mark_clean(bs); |
| 1085 | if (ret < 0) { |
| 1086 | error_setg_errno(errp, -ret, "Failed to disable lazy refcounts"); |
| 1087 | goto fail; |
| 1088 | } |
| 1089 | } |
| 1090 | |
Kevin Wolf | 007dbc3 | 2015-04-16 13:11:39 +0200 | [diff] [blame] | 1091 | /* Overlap check options */ |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1092 | opt_overlap_check = qemu_opt_get(opts, QCOW2_OPT_OVERLAP); |
| 1093 | opt_overlap_check_template = qemu_opt_get(opts, QCOW2_OPT_OVERLAP_TEMPLATE); |
| 1094 | if (opt_overlap_check_template && opt_overlap_check && |
| 1095 | strcmp(opt_overlap_check_template, opt_overlap_check)) |
| 1096 | { |
| 1097 | error_setg(errp, "Conflicting values for qcow2 options '" |
| 1098 | QCOW2_OPT_OVERLAP "' ('%s') and '" QCOW2_OPT_OVERLAP_TEMPLATE |
| 1099 | "' ('%s')", opt_overlap_check, opt_overlap_check_template); |
| 1100 | ret = -EINVAL; |
| 1101 | goto fail; |
| 1102 | } |
| 1103 | if (!opt_overlap_check) { |
| 1104 | opt_overlap_check = opt_overlap_check_template ?: "cached"; |
| 1105 | } |
| 1106 | |
| 1107 | if (!strcmp(opt_overlap_check, "none")) { |
| 1108 | overlap_check_template = 0; |
| 1109 | } else if (!strcmp(opt_overlap_check, "constant")) { |
| 1110 | overlap_check_template = QCOW2_OL_CONSTANT; |
| 1111 | } else if (!strcmp(opt_overlap_check, "cached")) { |
| 1112 | overlap_check_template = QCOW2_OL_CACHED; |
| 1113 | } else if (!strcmp(opt_overlap_check, "all")) { |
| 1114 | overlap_check_template = QCOW2_OL_ALL; |
| 1115 | } else { |
| 1116 | error_setg(errp, "Unsupported value '%s' for qcow2 option " |
| 1117 | "'overlap-check'. Allowed are any of the following: " |
| 1118 | "none, constant, cached, all", opt_overlap_check); |
| 1119 | ret = -EINVAL; |
| 1120 | goto fail; |
| 1121 | } |
| 1122 | |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1123 | r->overlap_check = 0; |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1124 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { |
| 1125 | /* overlap-check defines a template bitmask, but every flag may be |
| 1126 | * overwritten through the associated boolean option */ |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1127 | r->overlap_check |= |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1128 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], |
| 1129 | overlap_check_template & (1 << i)) << i; |
| 1130 | } |
| 1131 | |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1132 | r->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
| 1133 | r->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; |
| 1134 | r->discard_passthrough[QCOW2_DISCARD_REQUEST] = |
Kevin Wolf | 007dbc3 | 2015-04-16 13:11:39 +0200 | [diff] [blame] | 1135 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, |
| 1136 | flags & BDRV_O_UNMAP); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1137 | r->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = |
Kevin Wolf | 007dbc3 | 2015-04-16 13:11:39 +0200 | [diff] [blame] | 1138 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1139 | r->discard_passthrough[QCOW2_DISCARD_OTHER] = |
Kevin Wolf | 007dbc3 | 2015-04-16 13:11:39 +0200 | [diff] [blame] | 1140 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); |
| 1141 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1142 | switch (s->crypt_method_header) { |
| 1143 | case QCOW_CRYPT_NONE: |
| 1144 | if (encryptfmt) { |
| 1145 | error_setg(errp, "No encryption in image header, but options " |
| 1146 | "specified format '%s'", encryptfmt); |
| 1147 | ret = -EINVAL; |
| 1148 | goto fail; |
| 1149 | } |
| 1150 | break; |
| 1151 | |
| 1152 | case QCOW_CRYPT_AES: |
| 1153 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { |
| 1154 | error_setg(errp, |
| 1155 | "Header reported 'aes' encryption format but " |
| 1156 | "options specify '%s'", encryptfmt); |
| 1157 | ret = -EINVAL; |
| 1158 | goto fail; |
| 1159 | } |
Markus Armbruster | 796d323 | 2018-06-26 19:41:19 +0200 | [diff] [blame] | 1160 | qdict_put_str(encryptopts, "format", "qcow"); |
| 1161 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); |
Vladimir Sementsov-Ogievskiy | 1184b41 | 2021-02-02 15:49:56 +0300 | [diff] [blame] | 1162 | if (!r->crypto_opts) { |
| 1163 | ret = -EINVAL; |
| 1164 | goto fail; |
| 1165 | } |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1166 | break; |
| 1167 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 1168 | case QCOW_CRYPT_LUKS: |
| 1169 | if (encryptfmt && !g_str_equal(encryptfmt, "luks")) { |
| 1170 | error_setg(errp, |
| 1171 | "Header reported 'luks' encryption format but " |
| 1172 | "options specify '%s'", encryptfmt); |
| 1173 | ret = -EINVAL; |
| 1174 | goto fail; |
| 1175 | } |
Markus Armbruster | 796d323 | 2018-06-26 19:41:19 +0200 | [diff] [blame] | 1176 | qdict_put_str(encryptopts, "format", "luks"); |
| 1177 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); |
Vladimir Sementsov-Ogievskiy | 1184b41 | 2021-02-02 15:49:56 +0300 | [diff] [blame] | 1178 | if (!r->crypto_opts) { |
| 1179 | ret = -EINVAL; |
| 1180 | goto fail; |
| 1181 | } |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 1182 | break; |
| 1183 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1184 | default: |
| 1185 | error_setg(errp, "Unsupported encryption method %d", |
| 1186 | s->crypt_method_header); |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1187 | ret = -EINVAL; |
| 1188 | goto fail; |
| 1189 | } |
| 1190 | |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1191 | ret = 0; |
| 1192 | fail: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1193 | qobject_unref(encryptopts); |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1194 | qemu_opts_del(opts); |
| 1195 | opts = NULL; |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1196 | return ret; |
| 1197 | } |
| 1198 | |
| 1199 | static void qcow2_update_options_commit(BlockDriverState *bs, |
| 1200 | Qcow2ReopenState *r) |
| 1201 | { |
| 1202 | BDRVQcow2State *s = bs->opaque; |
| 1203 | int i; |
| 1204 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1205 | if (s->l2_table_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1206 | qcow2_cache_destroy(s->l2_table_cache); |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1207 | } |
| 1208 | if (s->refcount_block_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1209 | qcow2_cache_destroy(s->refcount_block_cache); |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1210 | } |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1211 | s->l2_table_cache = r->l2_table_cache; |
| 1212 | s->refcount_block_cache = r->refcount_block_cache; |
Alberto Garcia | 3c2e511 | 2018-02-05 16:33:13 +0200 | [diff] [blame] | 1213 | s->l2_slice_size = r->l2_slice_size; |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1214 | |
| 1215 | s->overlap_check = r->overlap_check; |
| 1216 | s->use_lazy_refcounts = r->use_lazy_refcounts; |
| 1217 | |
| 1218 | for (i = 0; i < QCOW2_DISCARD_MAX; i++) { |
| 1219 | s->discard_passthrough[i] = r->discard_passthrough[i]; |
| 1220 | } |
| 1221 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1222 | if (s->cache_clean_interval != r->cache_clean_interval) { |
| 1223 | cache_clean_timer_del(bs); |
| 1224 | s->cache_clean_interval = r->cache_clean_interval; |
| 1225 | cache_clean_timer_init(bs, bdrv_get_aio_context(bs)); |
| 1226 | } |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1227 | |
| 1228 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); |
| 1229 | s->crypto_opts = r->crypto_opts; |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1230 | } |
| 1231 | |
| 1232 | static void qcow2_update_options_abort(BlockDriverState *bs, |
| 1233 | Qcow2ReopenState *r) |
| 1234 | { |
| 1235 | if (r->l2_table_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1236 | qcow2_cache_destroy(r->l2_table_cache); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1237 | } |
| 1238 | if (r->refcount_block_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1239 | qcow2_cache_destroy(r->refcount_block_cache); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1240 | } |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1241 | qapi_free_QCryptoBlockOpenOptions(r->crypto_opts); |
Kevin Wolf | ee55b17 | 2015-04-16 16:16:02 +0200 | [diff] [blame] | 1242 | } |
| 1243 | |
| 1244 | static int qcow2_update_options(BlockDriverState *bs, QDict *options, |
| 1245 | int flags, Error **errp) |
| 1246 | { |
| 1247 | Qcow2ReopenState r = {}; |
| 1248 | int ret; |
| 1249 | |
| 1250 | ret = qcow2_update_options_prepare(bs, &r, options, flags, errp); |
| 1251 | if (ret >= 0) { |
| 1252 | qcow2_update_options_commit(bs, &r); |
| 1253 | } else { |
| 1254 | qcow2_update_options_abort(bs, &r); |
| 1255 | } |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1256 | |
Kevin Wolf | 4c75d1a | 2015-04-16 11:29:27 +0200 | [diff] [blame] | 1257 | return ret; |
| 1258 | } |
| 1259 | |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 1260 | static int validate_compression_type(BDRVQcow2State *s, Error **errp) |
| 1261 | { |
| 1262 | switch (s->compression_type) { |
| 1263 | case QCOW2_COMPRESSION_TYPE_ZLIB: |
Denis Plotnikov | d298ac1 | 2020-05-07 11:25:20 +0300 | [diff] [blame] | 1264 | #ifdef CONFIG_ZSTD |
| 1265 | case QCOW2_COMPRESSION_TYPE_ZSTD: |
| 1266 | #endif |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 1267 | break; |
| 1268 | |
| 1269 | default: |
| 1270 | error_setg(errp, "qcow2: unknown compression type: %u", |
| 1271 | s->compression_type); |
| 1272 | return -ENOTSUP; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * if the compression type differs from QCOW2_COMPRESSION_TYPE_ZLIB |
| 1277 | * the incompatible feature flag must be set |
| 1278 | */ |
| 1279 | if (s->compression_type == QCOW2_COMPRESSION_TYPE_ZLIB) { |
| 1280 | if (s->incompatible_features & QCOW2_INCOMPAT_COMPRESSION) { |
| 1281 | error_setg(errp, "qcow2: Compression type incompatible feature " |
| 1282 | "bit must not be set"); |
| 1283 | return -EINVAL; |
| 1284 | } |
| 1285 | } else { |
| 1286 | if (!(s->incompatible_features & QCOW2_INCOMPAT_COMPRESSION)) { |
| 1287 | error_setg(errp, "qcow2: Compression type incompatible feature " |
| 1288 | "bit must be set"); |
| 1289 | return -EINVAL; |
| 1290 | } |
| 1291 | } |
| 1292 | |
| 1293 | return 0; |
| 1294 | } |
| 1295 | |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1296 | /* Called with s->lock held. */ |
| 1297 | static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1298 | int flags, bool open_data_file, |
| 1299 | Error **errp) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1300 | { |
Vladimir Sementsov-Ogievskiy | bc52024 | 2021-02-02 15:49:45 +0300 | [diff] [blame] | 1301 | ERRP_GUARD(); |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 1302 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | 6d33e8e | 2014-03-26 13:05:47 +0100 | [diff] [blame] | 1303 | unsigned int len, i; |
| 1304 | int ret = 0; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1305 | QCowHeader header; |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 1306 | uint64_t ext_end; |
Kevin Wolf | 2cf7cfa | 2013-05-14 16:14:33 +0200 | [diff] [blame] | 1307 | uint64_t l1_vm_state_index; |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 1308 | bool update_header = false; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1309 | |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 1310 | ret = bdrv_co_pread(bs->file, 0, sizeof(header), &header, 0); |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1311 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1312 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1313 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1314 | } |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 1315 | header.magic = be32_to_cpu(header.magic); |
| 1316 | header.version = be32_to_cpu(header.version); |
| 1317 | header.backing_file_offset = be64_to_cpu(header.backing_file_offset); |
| 1318 | header.backing_file_size = be32_to_cpu(header.backing_file_size); |
| 1319 | header.size = be64_to_cpu(header.size); |
| 1320 | header.cluster_bits = be32_to_cpu(header.cluster_bits); |
| 1321 | header.crypt_method = be32_to_cpu(header.crypt_method); |
| 1322 | header.l1_table_offset = be64_to_cpu(header.l1_table_offset); |
| 1323 | header.l1_size = be32_to_cpu(header.l1_size); |
| 1324 | header.refcount_table_offset = be64_to_cpu(header.refcount_table_offset); |
| 1325 | header.refcount_table_clusters = |
| 1326 | be32_to_cpu(header.refcount_table_clusters); |
| 1327 | header.snapshots_offset = be64_to_cpu(header.snapshots_offset); |
| 1328 | header.nb_snapshots = be32_to_cpu(header.nb_snapshots); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 1329 | |
Kevin Wolf | e8cdcec | 2011-02-09 11:11:07 +0100 | [diff] [blame] | 1330 | if (header.magic != QCOW_MAGIC) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1331 | error_setg(errp, "Image is not in qcow2 format"); |
Paolo Bonzini | 76abe40 | 2014-02-17 14:44:06 +0100 | [diff] [blame] | 1332 | ret = -EINVAL; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1333 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1334 | } |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1335 | if (header.version < 2 || header.version > 3) { |
Max Reitz | a55448b | 2016-03-16 19:54:33 +0100 | [diff] [blame] | 1336 | error_setg(errp, "Unsupported qcow2 version %" PRIu32, header.version); |
Kevin Wolf | e8cdcec | 2011-02-09 11:11:07 +0100 | [diff] [blame] | 1337 | ret = -ENOTSUP; |
| 1338 | goto fail; |
| 1339 | } |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1340 | |
| 1341 | s->qcow_version = header.version; |
| 1342 | |
Kevin Wolf | 24342f2 | 2014-03-26 13:05:41 +0100 | [diff] [blame] | 1343 | /* Initialise cluster size */ |
| 1344 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
| 1345 | header.cluster_bits > MAX_CLUSTER_BITS) { |
Max Reitz | 521b2b5 | 2014-04-29 19:03:12 +0200 | [diff] [blame] | 1346 | error_setg(errp, "Unsupported cluster size: 2^%" PRIu32, |
| 1347 | header.cluster_bits); |
Kevin Wolf | 24342f2 | 2014-03-26 13:05:41 +0100 | [diff] [blame] | 1348 | ret = -EINVAL; |
| 1349 | goto fail; |
| 1350 | } |
| 1351 | |
| 1352 | s->cluster_bits = header.cluster_bits; |
| 1353 | s->cluster_size = 1 << s->cluster_bits; |
Kevin Wolf | 24342f2 | 2014-03-26 13:05:41 +0100 | [diff] [blame] | 1354 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1355 | /* Initialise version 3 header fields */ |
| 1356 | if (header.version == 2) { |
| 1357 | header.incompatible_features = 0; |
| 1358 | header.compatible_features = 0; |
| 1359 | header.autoclear_features = 0; |
| 1360 | header.refcount_order = 4; |
| 1361 | header.header_length = 72; |
| 1362 | } else { |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 1363 | header.incompatible_features = |
| 1364 | be64_to_cpu(header.incompatible_features); |
| 1365 | header.compatible_features = be64_to_cpu(header.compatible_features); |
| 1366 | header.autoclear_features = be64_to_cpu(header.autoclear_features); |
| 1367 | header.refcount_order = be32_to_cpu(header.refcount_order); |
| 1368 | header.header_length = be32_to_cpu(header.header_length); |
Kevin Wolf | 24342f2 | 2014-03-26 13:05:41 +0100 | [diff] [blame] | 1369 | |
| 1370 | if (header.header_length < 104) { |
| 1371 | error_setg(errp, "qcow2 header too short"); |
| 1372 | ret = -EINVAL; |
| 1373 | goto fail; |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | if (header.header_length > s->cluster_size) { |
| 1378 | error_setg(errp, "qcow2 header exceeds cluster size"); |
| 1379 | ret = -EINVAL; |
| 1380 | goto fail; |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | if (header.header_length > sizeof(header)) { |
| 1384 | s->unknown_header_fields_size = header.header_length - sizeof(header); |
| 1385 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 1386 | ret = bdrv_co_pread(bs->file, sizeof(header), |
| 1387 | s->unknown_header_fields_size, |
| 1388 | s->unknown_header_fields, 0); |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1389 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1390 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
| 1391 | "fields"); |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1392 | goto fail; |
| 1393 | } |
| 1394 | } |
| 1395 | |
Kevin Wolf | a1b3955c | 2014-03-26 13:05:42 +0100 | [diff] [blame] | 1396 | if (header.backing_file_offset > s->cluster_size) { |
| 1397 | error_setg(errp, "Invalid backing file offset"); |
| 1398 | ret = -EINVAL; |
| 1399 | goto fail; |
| 1400 | } |
| 1401 | |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 1402 | if (header.backing_file_offset) { |
| 1403 | ext_end = header.backing_file_offset; |
| 1404 | } else { |
| 1405 | ext_end = 1 << header.cluster_bits; |
| 1406 | } |
| 1407 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1408 | /* Handle feature bits */ |
| 1409 | s->incompatible_features = header.incompatible_features; |
| 1410 | s->compatible_features = header.compatible_features; |
| 1411 | s->autoclear_features = header.autoclear_features; |
| 1412 | |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 1413 | /* |
| 1414 | * Handle compression type |
| 1415 | * Older qcow2 images don't contain the compression type header. |
| 1416 | * Distinguish them by the header length and use |
| 1417 | * the only valid (default) compression type in that case |
| 1418 | */ |
| 1419 | if (header.header_length > offsetof(QCowHeader, compression_type)) { |
| 1420 | s->compression_type = header.compression_type; |
| 1421 | } else { |
| 1422 | s->compression_type = QCOW2_COMPRESSION_TYPE_ZLIB; |
| 1423 | } |
| 1424 | |
| 1425 | ret = validate_compression_type(s, errp); |
| 1426 | if (ret) { |
| 1427 | goto fail; |
| 1428 | } |
| 1429 | |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 1430 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 1431 | void *feature_table = NULL; |
| 1432 | qcow2_read_extensions(bs, header.header_length, ext_end, |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 1433 | &feature_table, flags, NULL, NULL); |
Max Reitz | a55448b | 2016-03-16 19:54:33 +0100 | [diff] [blame] | 1434 | report_unsupported_feature(errp, feature_table, |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 1435 | s->incompatible_features & |
| 1436 | ~QCOW2_INCOMPAT_MASK); |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1437 | ret = -ENOTSUP; |
Prasad Joshi | c5a33ee | 2014-03-28 23:08:58 +0530 | [diff] [blame] | 1438 | g_free(feature_table); |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1439 | goto fail; |
| 1440 | } |
| 1441 | |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 1442 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
| 1443 | /* Corrupt images may not be written to unless they are being repaired |
| 1444 | */ |
| 1445 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1446 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
| 1447 | "read/write"); |
Max Reitz | 69c9872 | 2013-08-30 14:34:24 +0200 | [diff] [blame] | 1448 | ret = -EACCES; |
| 1449 | goto fail; |
| 1450 | } |
| 1451 | } |
| 1452 | |
Alberto Garcia | d0346b5 | 2020-07-10 18:12:51 +0200 | [diff] [blame] | 1453 | s->subclusters_per_cluster = |
| 1454 | has_subclusters(s) ? QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER : 1; |
| 1455 | s->subcluster_size = s->cluster_size / s->subclusters_per_cluster; |
| 1456 | s->subcluster_bits = ctz32(s->subcluster_size); |
| 1457 | |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 1458 | if (s->subcluster_size < (1 << MIN_CLUSTER_BITS)) { |
| 1459 | error_setg(errp, "Unsupported subcluster size: %d", s->subcluster_size); |
| 1460 | ret = -EINVAL; |
| 1461 | goto fail; |
| 1462 | } |
| 1463 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1464 | /* Check support for various header values */ |
Max Reitz | b72faf9 | 2015-02-10 15:28:52 -0500 | [diff] [blame] | 1465 | if (header.refcount_order > 6) { |
| 1466 | error_setg(errp, "Reference count entry width too large; may not " |
| 1467 | "exceed 64 bits"); |
| 1468 | ret = -EINVAL; |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1469 | goto fail; |
| 1470 | } |
Max Reitz | b6481f3 | 2013-09-03 10:09:53 +0200 | [diff] [blame] | 1471 | s->refcount_order = header.refcount_order; |
Max Reitz | 346a53d | 2015-02-10 15:28:43 -0500 | [diff] [blame] | 1472 | s->refcount_bits = 1 << s->refcount_order; |
| 1473 | s->refcount_max = UINT64_C(1) << (s->refcount_bits - 1); |
| 1474 | s->refcount_max += s->refcount_max - 1; |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1475 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1476 | s->crypt_method_header = header.crypt_method; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1477 | if (s->crypt_method_header) { |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 1478 | if (bdrv_uses_whitelist() && |
| 1479 | s->crypt_method_header == QCOW_CRYPT_AES) { |
Daniel P. Berrange | 8c0dcbc | 2016-06-13 12:30:09 +0100 | [diff] [blame] | 1480 | error_setg(errp, |
| 1481 | "Use of AES-CBC encrypted qcow2 images is no longer " |
| 1482 | "supported in system emulators"); |
| 1483 | error_append_hint(errp, |
| 1484 | "You can use 'qemu-img convert' to convert your " |
| 1485 | "image to an alternative supported format, such " |
| 1486 | "as unencrypted qcow2, or raw with the LUKS " |
| 1487 | "format instead.\n"); |
| 1488 | ret = -ENOSYS; |
| 1489 | goto fail; |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 1490 | } |
| 1491 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 1492 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
| 1493 | s->crypt_physical_offset = false; |
| 1494 | } else { |
| 1495 | /* Assuming LUKS and any future crypt methods we |
| 1496 | * add will all use physical offsets, due to the |
| 1497 | * fact that the alternative is insecure... */ |
| 1498 | s->crypt_physical_offset = true; |
| 1499 | } |
| 1500 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 1501 | bs->encrypted = true; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1502 | } |
Kevin Wolf | 24342f2 | 2014-03-26 13:05:41 +0100 | [diff] [blame] | 1503 | |
Alberto Garcia | c8fd855 | 2020-07-10 18:12:54 +0200 | [diff] [blame] | 1504 | s->l2_bits = s->cluster_bits - ctz32(l2_entry_size(s)); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1505 | s->l2_size = 1 << s->l2_bits; |
Max Reitz | 1d13d65 | 2014-10-22 14:09:28 +0200 | [diff] [blame] | 1506 | /* 2^(s->refcount_order - 3) is the refcount width in bytes */ |
| 1507 | s->refcount_block_bits = s->cluster_bits - (s->refcount_order - 3); |
| 1508 | s->refcount_block_size = 1 << s->refcount_block_bits; |
Leonid Bloch | bd016b9 | 2018-09-26 19:04:47 +0300 | [diff] [blame] | 1509 | bs->total_sectors = header.size / BDRV_SECTOR_SIZE; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1510 | s->csize_shift = (62 - (s->cluster_bits - 8)); |
| 1511 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
| 1512 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
Kevin Wolf | 5dab2fa | 2014-03-26 13:05:43 +0100 | [diff] [blame] | 1513 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1514 | s->refcount_table_offset = header.refcount_table_offset; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 1515 | s->refcount_table_size = |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1516 | header.refcount_table_clusters << (s->cluster_bits - 3); |
| 1517 | |
Alberto Garcia | 951053a | 2017-11-03 16:18:53 +0200 | [diff] [blame] | 1518 | if (header.refcount_table_clusters == 0 && !(flags & BDRV_O_CHECK)) { |
| 1519 | error_setg(errp, "Image does not contain a reference count table"); |
| 1520 | ret = -EINVAL; |
| 1521 | goto fail; |
| 1522 | } |
| 1523 | |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 1524 | ret = qcow2_validate_table(bs, s->refcount_table_offset, |
| 1525 | header.refcount_table_clusters, |
| 1526 | s->cluster_size, QCOW_MAX_REFTABLE_SIZE, |
| 1527 | "Reference count table", errp); |
Kevin Wolf | 8c7de28 | 2014-03-26 13:05:44 +0100 | [diff] [blame] | 1528 | if (ret < 0) { |
Kevin Wolf | 8c7de28 | 2014-03-26 13:05:44 +0100 | [diff] [blame] | 1529 | goto fail; |
| 1530 | } |
| 1531 | |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 1532 | if (!(flags & BDRV_O_CHECK)) { |
| 1533 | /* |
| 1534 | * The total size in bytes of the snapshot table is checked in |
| 1535 | * qcow2_read_snapshots() because the size of each snapshot is |
| 1536 | * variable and we don't know it yet. |
| 1537 | * Here we only check the offset and number of snapshots. |
| 1538 | */ |
| 1539 | ret = qcow2_validate_table(bs, header.snapshots_offset, |
| 1540 | header.nb_snapshots, |
| 1541 | sizeof(QCowSnapshotHeader), |
| 1542 | sizeof(QCowSnapshotHeader) * |
| 1543 | QCOW_MAX_SNAPSHOTS, |
| 1544 | "Snapshot table", errp); |
| 1545 | if (ret < 0) { |
| 1546 | goto fail; |
| 1547 | } |
Kevin Wolf | ce48f2f4 | 2014-03-26 13:05:45 +0100 | [diff] [blame] | 1548 | } |
| 1549 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1550 | /* read the level 1 table */ |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 1551 | ret = qcow2_validate_table(bs, header.l1_table_offset, |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 1552 | header.l1_size, L1E_SIZE, |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 1553 | QCOW_MAX_L1_SIZE, "Active L1 table", errp); |
| 1554 | if (ret < 0) { |
Kevin Wolf | 2d51c32 | 2014-03-26 13:05:46 +0100 | [diff] [blame] | 1555 | goto fail; |
| 1556 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1557 | s->l1_size = header.l1_size; |
Alberto Garcia | 0cf0e59 | 2018-03-06 18:14:06 +0200 | [diff] [blame] | 1558 | s->l1_table_offset = header.l1_table_offset; |
Kevin Wolf | 2cf7cfa | 2013-05-14 16:14:33 +0200 | [diff] [blame] | 1559 | |
| 1560 | l1_vm_state_index = size_to_l1(s, header.size); |
| 1561 | if (l1_vm_state_index > INT_MAX) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1562 | error_setg(errp, "Image is too big"); |
Kevin Wolf | 2cf7cfa | 2013-05-14 16:14:33 +0200 | [diff] [blame] | 1563 | ret = -EFBIG; |
| 1564 | goto fail; |
| 1565 | } |
| 1566 | s->l1_vm_state_index = l1_vm_state_index; |
| 1567 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1568 | /* the L1 table must contain at least enough entries to put |
| 1569 | header.size bytes */ |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1570 | if (s->l1_size < s->l1_vm_state_index) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1571 | error_setg(errp, "L1 table is too small"); |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1572 | ret = -EINVAL; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1573 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1574 | } |
Kevin Wolf | 2d51c32 | 2014-03-26 13:05:46 +0100 | [diff] [blame] | 1575 | |
Stefan Weil | d191d12 | 2009-10-26 16:11:16 +0100 | [diff] [blame] | 1576 | if (s->l1_size > 0) { |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 1577 | s->l1_table = qemu_try_blockalign(bs->file->bs, s->l1_size * L1E_SIZE); |
Kevin Wolf | de82815 | 2014-05-20 17:12:47 +0200 | [diff] [blame] | 1578 | if (s->l1_table == NULL) { |
| 1579 | error_setg(errp, "Could not allocate L1 table"); |
| 1580 | ret = -ENOMEM; |
| 1581 | goto fail; |
| 1582 | } |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 1583 | ret = bdrv_co_pread(bs->file, s->l1_table_offset, s->l1_size * L1E_SIZE, |
| 1584 | s->l1_table, 0); |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1585 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1586 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
Stefan Weil | d191d12 | 2009-10-26 16:11:16 +0100 | [diff] [blame] | 1587 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1588 | } |
Stefan Weil | d191d12 | 2009-10-26 16:11:16 +0100 | [diff] [blame] | 1589 | for(i = 0;i < s->l1_size; i++) { |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 1590 | s->l1_table[i] = be64_to_cpu(s->l1_table[i]); |
Stefan Weil | d191d12 | 2009-10-26 16:11:16 +0100 | [diff] [blame] | 1591 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1592 | } |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 1593 | |
Kevin Wolf | 94edf3f | 2015-04-16 11:44:26 +0200 | [diff] [blame] | 1594 | /* Parse driver-specific options */ |
| 1595 | ret = qcow2_update_options(bs, options, flags, errp); |
Kevin Wolf | 90efa0e | 2015-04-16 11:36:10 +0200 | [diff] [blame] | 1596 | if (ret < 0) { |
| 1597 | goto fail; |
| 1598 | } |
| 1599 | |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 1600 | s->flags = flags; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 1601 | |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1602 | ret = qcow2_refcount_init(bs); |
| 1603 | if (ret != 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1604 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1605 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1606 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1607 | |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 1608 | QLIST_INIT(&s->cluster_allocs); |
Kevin Wolf | 0b919fa | 2013-06-19 13:44:20 +0200 | [diff] [blame] | 1609 | QTAILQ_INIT(&s->discards); |
Kevin Wolf | f214978 | 2009-08-31 16:48:49 +0200 | [diff] [blame] | 1610 | |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 1611 | /* read qcow2 extensions */ |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1612 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 1613 | flags, &update_header, errp)) { |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1614 | ret = -EINVAL; |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 1615 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1616 | } |
aliguori | 9b80ddf | 2009-03-28 17:55:06 +0000 | [diff] [blame] | 1617 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1618 | if (open_data_file) { |
| 1619 | /* Open external data file */ |
| 1620 | s->data_file = bdrv_open_child(NULL, options, "data-file", bs, |
| 1621 | &child_of_bds, BDRV_CHILD_DATA, |
| 1622 | true, errp); |
| 1623 | if (*errp) { |
| 1624 | ret = -EINVAL; |
| 1625 | goto fail; |
| 1626 | } |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 1627 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1628 | if (s->incompatible_features & QCOW2_INCOMPAT_DATA_FILE) { |
| 1629 | if (!s->data_file && s->image_data_file) { |
| 1630 | s->data_file = bdrv_open_child(s->image_data_file, options, |
| 1631 | "data-file", bs, &child_of_bds, |
| 1632 | BDRV_CHILD_DATA, false, errp); |
| 1633 | if (!s->data_file) { |
| 1634 | ret = -EINVAL; |
| 1635 | goto fail; |
| 1636 | } |
| 1637 | } |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 1638 | if (!s->data_file) { |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1639 | error_setg(errp, "'data-file' is required for this image"); |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 1640 | ret = -EINVAL; |
| 1641 | goto fail; |
| 1642 | } |
Max Reitz | 8b1869d | 2020-05-13 13:05:35 +0200 | [diff] [blame] | 1643 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1644 | /* No data here */ |
| 1645 | bs->file->role &= ~BDRV_CHILD_DATA; |
Max Reitz | 8b1869d | 2020-05-13 13:05:35 +0200 | [diff] [blame] | 1646 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1647 | /* Must succeed because we have given up permissions if anything */ |
| 1648 | bdrv_child_refresh_perms(bs, bs->file, &error_abort); |
| 1649 | } else { |
| 1650 | if (s->data_file) { |
| 1651 | error_setg(errp, "'data-file' can only be set for images with " |
| 1652 | "an external data file"); |
| 1653 | ret = -EINVAL; |
| 1654 | goto fail; |
| 1655 | } |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 1656 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1657 | s->data_file = bs->file; |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 1658 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1659 | if (data_file_is_raw(bs)) { |
| 1660 | error_setg(errp, "data-file-raw requires a data file"); |
| 1661 | ret = -EINVAL; |
| 1662 | goto fail; |
| 1663 | } |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 1664 | } |
| 1665 | } |
Kevin Wolf | 93c2493 | 2019-01-14 16:48:25 +0100 | [diff] [blame] | 1666 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 1667 | /* qcow2_read_extension may have set up the crypto context |
| 1668 | * if the crypt method needs a header region, some methods |
| 1669 | * don't need header extensions, so must check here |
| 1670 | */ |
| 1671 | if (s->crypt_method_header && !s->crypto) { |
| 1672 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
| 1673 | unsigned int cflags = 0; |
| 1674 | if (flags & BDRV_O_NO_IO) { |
| 1675 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; |
| 1676 | } |
Daniel P. Berrange | 1cd9a78 | 2017-06-23 17:24:17 +0100 | [diff] [blame] | 1677 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
Vladimir Sementsov-Ogievskiy | 8ac0f15 | 2019-05-06 17:27:41 +0300 | [diff] [blame] | 1678 | NULL, NULL, cflags, |
| 1679 | QCOW2_MAX_THREADS, errp); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 1680 | if (!s->crypto) { |
| 1681 | ret = -EINVAL; |
| 1682 | goto fail; |
| 1683 | } |
| 1684 | } else if (!(flags & BDRV_O_NO_IO)) { |
| 1685 | error_setg(errp, "Missing CRYPTO header for crypt method %d", |
| 1686 | s->crypt_method_header); |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1687 | ret = -EINVAL; |
| 1688 | goto fail; |
| 1689 | } |
| 1690 | } |
| 1691 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1692 | /* read the backing file name */ |
| 1693 | if (header.backing_file_offset != 0) { |
| 1694 | len = header.backing_file_size; |
Jeff Cody | 9a29e18 | 2015-01-22 08:03:30 -0500 | [diff] [blame] | 1695 | if (len > MIN(1023, s->cluster_size - header.backing_file_offset) || |
Jeff Cody | e729fa6 | 2015-01-27 08:33:55 -0500 | [diff] [blame] | 1696 | len >= sizeof(bs->backing_file)) { |
Kevin Wolf | 6d33e8e | 2014-03-26 13:05:47 +0100 | [diff] [blame] | 1697 | error_setg(errp, "Backing file name too long"); |
| 1698 | ret = -EINVAL; |
| 1699 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1700 | } |
Hanna Reitz | ec64b1c | 2022-08-03 16:44:44 +0200 | [diff] [blame] | 1701 | |
| 1702 | s->image_backing_file = g_malloc(len + 1); |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 1703 | ret = bdrv_co_pread(bs->file, header.backing_file_offset, len, |
| 1704 | s->image_backing_file, 0); |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1705 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1706 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1707 | goto fail; |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1708 | } |
Hanna Reitz | ec64b1c | 2022-08-03 16:44:44 +0200 | [diff] [blame] | 1709 | s->image_backing_file[len] = '\0'; |
| 1710 | |
| 1711 | /* |
| 1712 | * Update only when something has changed. This function is called by |
| 1713 | * qcow2_co_invalidate_cache(), and we do not want to reset |
| 1714 | * auto_backing_file unless necessary. |
| 1715 | */ |
| 1716 | if (!g_str_equal(s->image_backing_file, bs->backing_file)) { |
| 1717 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), |
| 1718 | s->image_backing_file); |
| 1719 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 1720 | s->image_backing_file); |
| 1721 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1722 | } |
Kevin Wolf | 42deb29 | 2011-11-16 11:43:28 +0100 | [diff] [blame] | 1723 | |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 1724 | /* |
| 1725 | * Internal snapshots; skip reading them in check mode, because |
| 1726 | * we do not need them then, and we do not want to abort because |
| 1727 | * of a broken table. |
| 1728 | */ |
| 1729 | if (!(flags & BDRV_O_CHECK)) { |
| 1730 | s->snapshots_offset = header.snapshots_offset; |
| 1731 | s->nb_snapshots = header.nb_snapshots; |
Kevin Wolf | 11b128f | 2014-03-26 13:06:04 +0100 | [diff] [blame] | 1732 | |
Max Reitz | 8bc584f | 2019-10-11 17:28:06 +0200 | [diff] [blame] | 1733 | ret = qcow2_read_snapshots(bs, errp); |
| 1734 | if (ret < 0) { |
| 1735 | goto fail; |
| 1736 | } |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1737 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1738 | |
Stefan Hajnoczi | af7b708 | 2012-06-14 11:42:23 +0100 | [diff] [blame] | 1739 | /* Clear unknown autoclear feature bits */ |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 1740 | update_header |= s->autoclear_features & ~QCOW2_AUTOCLEAR_MASK; |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1741 | update_header = update_header && bdrv_is_writable(bs); |
Vladimir Sementsov-Ogievskiy | d1258dd | 2017-06-28 15:05:11 +0300 | [diff] [blame] | 1742 | if (update_header) { |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 1743 | s->autoclear_features &= QCOW2_AUTOCLEAR_MASK; |
Vladimir Sementsov-Ogievskiy | d1258dd | 2017-06-28 15:05:11 +0300 | [diff] [blame] | 1744 | } |
| 1745 | |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 1746 | /* == Handle persistent dirty bitmaps == |
| 1747 | * |
| 1748 | * We want load dirty bitmaps in three cases: |
| 1749 | * |
| 1750 | * 1. Normal open of the disk in active mode, not related to invalidation |
| 1751 | * after migration. |
| 1752 | * |
| 1753 | * 2. Invalidation of the target vm after pre-copy phase of migration, if |
| 1754 | * bitmaps are _not_ migrating through migration channel, i.e. |
| 1755 | * 'dirty-bitmaps' capability is disabled. |
| 1756 | * |
| 1757 | * 3. Invalidation of source vm after failed or canceled migration. |
| 1758 | * This is a very interesting case. There are two possible types of |
| 1759 | * bitmaps: |
| 1760 | * |
| 1761 | * A. Stored on inactivation and removed. They should be loaded from the |
| 1762 | * image. |
| 1763 | * |
| 1764 | * B. Not stored: not-persistent bitmaps and bitmaps, migrated through |
| 1765 | * the migration channel (with dirty-bitmaps capability). |
| 1766 | * |
| 1767 | * On the other hand, there are two possible sub-cases: |
| 1768 | * |
| 1769 | * 3.1 disk was changed by somebody else while were inactive. In this |
| 1770 | * case all in-RAM dirty bitmaps (both persistent and not) are |
| 1771 | * definitely invalid. And we don't have any method to determine |
| 1772 | * this. |
| 1773 | * |
| 1774 | * Simple and safe thing is to just drop all the bitmaps of type B on |
| 1775 | * inactivation. But in this case we lose bitmaps in valid 4.2 case. |
| 1776 | * |
| 1777 | * On the other hand, resuming source vm, if disk was already changed |
| 1778 | * is a bad thing anyway: not only bitmaps, the whole vm state is |
| 1779 | * out of sync with disk. |
| 1780 | * |
| 1781 | * This means, that user or management tool, who for some reason |
| 1782 | * decided to resume source vm, after disk was already changed by |
| 1783 | * target vm, should at least drop all dirty bitmaps by hand. |
| 1784 | * |
| 1785 | * So, we can ignore this case for now, but TODO: "generation" |
| 1786 | * extension for qcow2, to determine, that image was changed after |
| 1787 | * last inactivation. And if it is changed, we will drop (or at least |
| 1788 | * mark as 'invalid' all the bitmaps of type B, both persistent |
| 1789 | * and not). |
| 1790 | * |
| 1791 | * 3.2 disk was _not_ changed while were inactive. Bitmaps may be saved |
| 1792 | * to disk ('dirty-bitmaps' capability disabled), or not saved |
| 1793 | * ('dirty-bitmaps' capability enabled), but we don't need to care |
| 1794 | * of: let's load bitmaps as always: stored bitmaps will be loaded, |
| 1795 | * and not stored has flag IN_USE=1 in the image and will be skipped |
| 1796 | * on loading. |
| 1797 | * |
| 1798 | * One remaining possible case when we don't want load bitmaps: |
| 1799 | * |
| 1800 | * 4. Open disk in inactive mode in target vm (bitmaps are migrating or |
| 1801 | * will be loaded on invalidation, no needs try loading them before) |
| 1802 | */ |
| 1803 | |
| 1804 | if (!(bdrv_get_flags(bs) & BDRV_O_INACTIVE)) { |
| 1805 | /* It's case 1, 2 or 3.2. Or 3.1 which is BUG in management layer. */ |
Vladimir Sementsov-Ogievskiy | 0c1e9d2 | 2021-02-02 15:49:51 +0300 | [diff] [blame] | 1806 | bool header_updated; |
| 1807 | if (!qcow2_load_dirty_bitmaps(bs, &header_updated, errp)) { |
Tuguoyi | 66be5c3 | 2019-12-18 11:53:35 +0000 | [diff] [blame] | 1808 | ret = -EINVAL; |
| 1809 | goto fail; |
| 1810 | } |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 1811 | |
| 1812 | update_header = update_header && !header_updated; |
Vladimir Sementsov-Ogievskiy | d1258dd | 2017-06-28 15:05:11 +0300 | [diff] [blame] | 1813 | } |
Vladimir Sementsov-Ogievskiy | d1258dd | 2017-06-28 15:05:11 +0300 | [diff] [blame] | 1814 | |
| 1815 | if (update_header) { |
Stefan Hajnoczi | af7b708 | 2012-06-14 11:42:23 +0100 | [diff] [blame] | 1816 | ret = qcow2_update_header(bs); |
| 1817 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1818 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
Stefan Hajnoczi | af7b708 | 2012-06-14 11:42:23 +0100 | [diff] [blame] | 1819 | goto fail; |
| 1820 | } |
| 1821 | } |
| 1822 | |
Kevin Wolf | 3b65081 | 2019-11-22 16:57:48 +0100 | [diff] [blame] | 1823 | bs->supported_zero_flags = header.version >= 3 ? |
| 1824 | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK : 0; |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 1825 | bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; |
Kevin Wolf | 68d100e | 2011-06-30 17:42:09 +0200 | [diff] [blame] | 1826 | |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 1827 | /* Repair image if dirty */ |
Vladimir Sementsov-Ogievskiy | 307261b | 2021-05-27 18:40:54 +0300 | [diff] [blame] | 1828 | if (!(flags & BDRV_O_CHECK) && bdrv_is_writable(bs) && |
Stefan Hajnoczi | 058f8f1 | 2012-08-09 13:05:56 +0100 | [diff] [blame] | 1829 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 1830 | BdrvCheckResult result = {0}; |
| 1831 | |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 1832 | ret = qcow2_co_check_locked(bs, &result, |
| 1833 | BDRV_FIX_ERRORS | BDRV_FIX_LEAKS); |
Max Reitz | 791fff5 | 2017-11-10 21:31:07 +0100 | [diff] [blame] | 1834 | if (ret < 0 || result.check_errors) { |
| 1835 | if (ret >= 0) { |
| 1836 | ret = -EIO; |
| 1837 | } |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 1838 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 1839 | goto fail; |
| 1840 | } |
| 1841 | } |
| 1842 | |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1843 | #ifdef DEBUG_ALLOC |
Philipp Hahn | 6cbc303 | 2011-08-04 19:22:10 +0200 | [diff] [blame] | 1844 | { |
| 1845 | BdrvCheckResult result = {0}; |
Stefan Hajnoczi | b35278f | 2012-06-15 16:41:07 +0100 | [diff] [blame] | 1846 | qcow2_check_refcounts(bs, &result, 0); |
Philipp Hahn | 6cbc303 | 2011-08-04 19:22:10 +0200 | [diff] [blame] | 1847 | } |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1848 | #endif |
Vladimir Sementsov-Ogievskiy | ceb029c | 2018-06-20 17:48:37 +0300 | [diff] [blame] | 1849 | |
Vladimir Sementsov-Ogievskiy | 6f13a31 | 2019-05-06 17:27:38 +0300 | [diff] [blame] | 1850 | qemu_co_queue_init(&s->thread_task_queue); |
Vladimir Sementsov-Ogievskiy | ceb029c | 2018-06-20 17:48:37 +0300 | [diff] [blame] | 1851 | |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1852 | return ret; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1853 | |
| 1854 | fail: |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 1855 | g_free(s->image_data_file); |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1856 | if (open_data_file && has_data_file(bs)) { |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 1857 | bdrv_unref_child(bs, s->data_file); |
Vladimir Sementsov-Ogievskiy | 808cf3c | 2020-03-16 09:06:31 +0300 | [diff] [blame] | 1858 | s->data_file = NULL; |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 1859 | } |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 1860 | g_free(s->unknown_header_fields); |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 1861 | cleanup_unknown_header_ext(bs); |
Kevin Wolf | ed6ccf0 | 2009-05-28 16:07:07 +0200 | [diff] [blame] | 1862 | qcow2_free_snapshots(bs); |
| 1863 | qcow2_refcount_close(bs); |
Kevin Wolf | de82815 | 2014-05-20 17:12:47 +0200 | [diff] [blame] | 1864 | qemu_vfree(s->l1_table); |
Max Reitz | cf93980 | 2013-08-30 14:34:26 +0200 | [diff] [blame] | 1865 | /* else pre-write overlap checks in cache_destroy may crash */ |
| 1866 | s->l1_table = NULL; |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 1867 | cache_clean_timer_del(bs); |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 1868 | if (s->l2_table_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1869 | qcow2_cache_destroy(s->l2_table_cache); |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 1870 | } |
Prasad Joshi | c5a33ee | 2014-03-28 23:08:58 +0530 | [diff] [blame] | 1871 | if (s->refcount_block_cache) { |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 1872 | qcow2_cache_destroy(s->refcount_block_cache); |
Prasad Joshi | c5a33ee | 2014-03-28 23:08:58 +0530 | [diff] [blame] | 1873 | } |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 1874 | qcrypto_block_free(s->crypto); |
| 1875 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); |
Jes Sorensen | 6d85a57 | 2010-12-17 16:02:40 +0100 | [diff] [blame] | 1876 | return ret; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 1877 | } |
| 1878 | |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1879 | typedef struct QCow2OpenCo { |
| 1880 | BlockDriverState *bs; |
| 1881 | QDict *options; |
| 1882 | int flags; |
| 1883 | Error **errp; |
| 1884 | int ret; |
| 1885 | } QCow2OpenCo; |
| 1886 | |
| 1887 | static void coroutine_fn qcow2_open_entry(void *opaque) |
| 1888 | { |
| 1889 | QCow2OpenCo *qoc = opaque; |
| 1890 | BDRVQcow2State *s = qoc->bs->opaque; |
| 1891 | |
| 1892 | qemu_co_mutex_lock(&s->lock); |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 1893 | qoc->ret = qcow2_do_open(qoc->bs, qoc->options, qoc->flags, true, |
| 1894 | qoc->errp); |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1895 | qemu_co_mutex_unlock(&s->lock); |
| 1896 | } |
| 1897 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 1898 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
| 1899 | Error **errp) |
| 1900 | { |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1901 | BDRVQcow2State *s = bs->opaque; |
| 1902 | QCow2OpenCo qoc = { |
| 1903 | .bs = bs, |
| 1904 | .options = options, |
| 1905 | .flags = flags, |
| 1906 | .errp = errp, |
| 1907 | .ret = -EINPROGRESS |
| 1908 | }; |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 1909 | int ret; |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1910 | |
Vladimir Sementsov-Ogievskiy | 8393078 | 2022-07-26 23:11:21 +0300 | [diff] [blame] | 1911 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
| 1912 | if (ret < 0) { |
| 1913 | return ret; |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 1914 | } |
| 1915 | |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1916 | /* Initialise locks */ |
| 1917 | qemu_co_mutex_init(&s->lock); |
| 1918 | |
| 1919 | if (qemu_in_coroutine()) { |
| 1920 | /* From bdrv_co_create. */ |
| 1921 | qcow2_open_entry(&qoc); |
| 1922 | } else { |
Kevin Wolf | 4720cbe | 2019-01-07 13:02:48 +0100 | [diff] [blame] | 1923 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
Paolo Bonzini | 1fafcd9 | 2018-03-01 17:36:16 +0100 | [diff] [blame] | 1924 | qemu_coroutine_enter(qemu_coroutine_create(qcow2_open_entry, &qoc)); |
| 1925 | BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS); |
| 1926 | } |
| 1927 | return qoc.ret; |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 1928 | } |
| 1929 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1930 | static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp) |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 1931 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 1932 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 1933 | |
Eric Blake | a84178c | 2016-06-23 16:37:15 -0600 | [diff] [blame] | 1934 | if (bs->encrypted) { |
| 1935 | /* Encryption works on a sector granularity */ |
Alberto Garcia | 6f8f015 | 2018-10-11 13:58:02 +0300 | [diff] [blame] | 1936 | bs->bl.request_alignment = qcrypto_block_get_sector_size(s->crypto); |
Eric Blake | a84178c | 2016-06-23 16:37:15 -0600 | [diff] [blame] | 1937 | } |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 1938 | bs->bl.pwrite_zeroes_alignment = s->subcluster_size; |
Eric Blake | ecdbead | 2016-11-17 14:13:55 -0600 | [diff] [blame] | 1939 | bs->bl.pdiscard_alignment = s->cluster_size; |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 1940 | } |
| 1941 | |
Jeff Cody | 21d82ac | 2012-09-20 15:13:28 -0400 | [diff] [blame] | 1942 | static int qcow2_reopen_prepare(BDRVReopenState *state, |
| 1943 | BlockReopenQueue *queue, Error **errp) |
| 1944 | { |
Kevin Wolf | bcfd86d | 2021-07-08 13:47:04 +0200 | [diff] [blame] | 1945 | BDRVQcow2State *s = state->bs->opaque; |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1946 | Qcow2ReopenState *r; |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 1947 | int ret; |
| 1948 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1949 | r = g_new0(Qcow2ReopenState, 1); |
| 1950 | state->opaque = r; |
| 1951 | |
| 1952 | ret = qcow2_update_options_prepare(state->bs, r, state->options, |
| 1953 | state->flags, errp); |
| 1954 | if (ret < 0) { |
| 1955 | goto fail; |
| 1956 | } |
| 1957 | |
| 1958 | /* We need to write out any unwritten data if we reopen read-only. */ |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 1959 | if ((state->flags & BDRV_O_RDWR) == 0) { |
Vladimir Sementsov-Ogievskiy | 169b879 | 2017-06-28 15:05:20 +0300 | [diff] [blame] | 1960 | ret = qcow2_reopen_bitmaps_ro(state->bs, errp); |
| 1961 | if (ret < 0) { |
| 1962 | goto fail; |
| 1963 | } |
| 1964 | |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 1965 | ret = bdrv_flush(state->bs); |
| 1966 | if (ret < 0) { |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1967 | goto fail; |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 1968 | } |
| 1969 | |
| 1970 | ret = qcow2_mark_clean(state->bs); |
| 1971 | if (ret < 0) { |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1972 | goto fail; |
Kevin Wolf | 4c2e5f8 | 2014-04-03 13:47:50 +0200 | [diff] [blame] | 1973 | } |
| 1974 | } |
| 1975 | |
Kevin Wolf | bcfd86d | 2021-07-08 13:47:04 +0200 | [diff] [blame] | 1976 | /* |
| 1977 | * Without an external data file, s->data_file points to the same BdrvChild |
| 1978 | * as bs->file. It needs to be resynced after reopen because bs->file may |
| 1979 | * be changed. We can't use it in the meantime. |
| 1980 | */ |
| 1981 | if (!has_data_file(state->bs)) { |
| 1982 | assert(s->data_file == state->bs->file); |
| 1983 | s->data_file = NULL; |
| 1984 | } |
| 1985 | |
Jeff Cody | 21d82ac | 2012-09-20 15:13:28 -0400 | [diff] [blame] | 1986 | return 0; |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1987 | |
| 1988 | fail: |
| 1989 | qcow2_update_options_abort(state->bs, r); |
| 1990 | g_free(r); |
| 1991 | return ret; |
| 1992 | } |
| 1993 | |
| 1994 | static void qcow2_reopen_commit(BDRVReopenState *state) |
| 1995 | { |
Kevin Wolf | bcfd86d | 2021-07-08 13:47:04 +0200 | [diff] [blame] | 1996 | BDRVQcow2State *s = state->bs->opaque; |
| 1997 | |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 1998 | qcow2_update_options_commit(state->bs, state->opaque); |
Kevin Wolf | bcfd86d | 2021-07-08 13:47:04 +0200 | [diff] [blame] | 1999 | if (!s->data_file) { |
| 2000 | /* |
| 2001 | * If we don't have an external data file, s->data_file was cleared by |
| 2002 | * qcow2_reopen_prepare() and needs to be updated. |
| 2003 | */ |
| 2004 | s->data_file = state->bs->file; |
| 2005 | } |
Peter Krempa | 65eb7c8 | 2020-02-28 13:44:47 +0100 | [diff] [blame] | 2006 | g_free(state->opaque); |
| 2007 | } |
| 2008 | |
| 2009 | static void qcow2_reopen_commit_post(BDRVReopenState *state) |
| 2010 | { |
Vladimir Sementsov-Ogievskiy | 4dd09f6 | 2019-09-27 15:23:55 +0300 | [diff] [blame] | 2011 | if (state->flags & BDRV_O_RDWR) { |
| 2012 | Error *local_err = NULL; |
| 2013 | |
| 2014 | if (qcow2_reopen_bitmaps_rw(state->bs, &local_err) < 0) { |
| 2015 | /* |
| 2016 | * This is not fatal, bitmaps just left read-only, so all following |
| 2017 | * writes will fail. User can remove read-only bitmaps to unblock |
| 2018 | * writes or retry reopen. |
| 2019 | */ |
| 2020 | error_reportf_err(local_err, |
| 2021 | "%s: Failed to make dirty bitmaps writable: ", |
| 2022 | bdrv_get_node_name(state->bs)); |
| 2023 | } |
| 2024 | } |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 2025 | } |
| 2026 | |
| 2027 | static void qcow2_reopen_abort(BDRVReopenState *state) |
| 2028 | { |
Kevin Wolf | bcfd86d | 2021-07-08 13:47:04 +0200 | [diff] [blame] | 2029 | BDRVQcow2State *s = state->bs->opaque; |
| 2030 | |
| 2031 | if (!s->data_file) { |
| 2032 | /* |
| 2033 | * If we don't have an external data file, s->data_file was cleared by |
| 2034 | * qcow2_reopen_prepare() and needs to be restored. |
| 2035 | */ |
| 2036 | s->data_file = state->bs->file; |
| 2037 | } |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 2038 | qcow2_update_options_abort(state->bs, state->opaque); |
| 2039 | g_free(state->opaque); |
Jeff Cody | 21d82ac | 2012-09-20 15:13:28 -0400 | [diff] [blame] | 2040 | } |
| 2041 | |
Kevin Wolf | 5365f44 | 2015-11-16 15:34:59 +0100 | [diff] [blame] | 2042 | static void qcow2_join_options(QDict *options, QDict *old_options) |
| 2043 | { |
| 2044 | bool has_new_overlap_template = |
| 2045 | qdict_haskey(options, QCOW2_OPT_OVERLAP) || |
| 2046 | qdict_haskey(options, QCOW2_OPT_OVERLAP_TEMPLATE); |
| 2047 | bool has_new_total_cache_size = |
| 2048 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE); |
| 2049 | bool has_all_cache_options; |
| 2050 | |
| 2051 | /* New overlap template overrides all old overlap options */ |
| 2052 | if (has_new_overlap_template) { |
| 2053 | qdict_del(old_options, QCOW2_OPT_OVERLAP); |
| 2054 | qdict_del(old_options, QCOW2_OPT_OVERLAP_TEMPLATE); |
| 2055 | qdict_del(old_options, QCOW2_OPT_OVERLAP_MAIN_HEADER); |
| 2056 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L1); |
| 2057 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L2); |
| 2058 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_TABLE); |
| 2059 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK); |
| 2060 | qdict_del(old_options, QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE); |
| 2061 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L1); |
| 2062 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L2); |
| 2063 | } |
| 2064 | |
| 2065 | /* New total cache size overrides all old options */ |
| 2066 | if (qdict_haskey(options, QCOW2_OPT_CACHE_SIZE)) { |
| 2067 | qdict_del(old_options, QCOW2_OPT_L2_CACHE_SIZE); |
| 2068 | qdict_del(old_options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); |
| 2069 | } |
| 2070 | |
| 2071 | qdict_join(options, old_options, false); |
| 2072 | |
| 2073 | /* |
| 2074 | * If after merging all cache size options are set, an old total size is |
| 2075 | * overwritten. Do keep all options, however, if all three are new. The |
| 2076 | * resulting error message is what we want to happen. |
| 2077 | */ |
| 2078 | has_all_cache_options = |
| 2079 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE) || |
| 2080 | qdict_haskey(options, QCOW2_OPT_L2_CACHE_SIZE) || |
| 2081 | qdict_haskey(options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); |
| 2082 | |
| 2083 | if (has_all_cache_options && !has_new_total_cache_size) { |
| 2084 | qdict_del(options, QCOW2_OPT_CACHE_SIZE); |
| 2085 | } |
| 2086 | } |
| 2087 | |
Eric Blake | a320fb0 | 2018-02-13 14:26:52 -0600 | [diff] [blame] | 2088 | static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, |
| 2089 | bool want_zero, |
| 2090 | int64_t offset, int64_t count, |
| 2091 | int64_t *pnum, int64_t *map, |
| 2092 | BlockDriverState **file) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2093 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2094 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | 388e581 | 2020-07-10 18:12:44 +0200 | [diff] [blame] | 2095 | uint64_t host_offset; |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2096 | unsigned int bytes; |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2097 | QCow2SubclusterType type; |
Alberto Garcia | 74e60fb | 2019-12-12 12:01:21 +0200 | [diff] [blame] | 2098 | int ret, status = 0; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2099 | |
Kevin Wolf | 5e97855 | 2019-10-24 16:26:58 +0200 | [diff] [blame] | 2100 | qemu_co_mutex_lock(&s->lock); |
| 2101 | |
Vladimir Sementsov-Ogievskiy | 69f4750 | 2019-04-08 19:26:17 +0300 | [diff] [blame] | 2102 | if (!s->metadata_preallocation_checked) { |
| 2103 | ret = qcow2_detect_metadata_preallocation(bs); |
| 2104 | s->metadata_preallocation = (ret == 1); |
| 2105 | s->metadata_preallocation_checked = true; |
| 2106 | } |
| 2107 | |
Eric Blake | a320fb0 | 2018-02-13 14:26:52 -0600 | [diff] [blame] | 2108 | bytes = MIN(INT_MAX, count); |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 2109 | ret = qcow2_get_host_offset(bs, offset, &bytes, &host_offset, &type); |
Stefan Hajnoczi | f8a2e5e | 2011-11-14 12:44:21 +0000 | [diff] [blame] | 2110 | qemu_co_mutex_unlock(&s->lock); |
Kevin Wolf | 1c46efa | 2010-05-21 17:59:36 +0200 | [diff] [blame] | 2111 | if (ret < 0) { |
Paolo Bonzini | d663640 | 2013-09-04 19:00:25 +0200 | [diff] [blame] | 2112 | return ret; |
Kevin Wolf | 1c46efa | 2010-05-21 17:59:36 +0200 | [diff] [blame] | 2113 | } |
aliguori | 095a9c5 | 2008-08-14 18:10:28 +0000 | [diff] [blame] | 2114 | |
Eric Blake | a320fb0 | 2018-02-13 14:26:52 -0600 | [diff] [blame] | 2115 | *pnum = bytes; |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2116 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2117 | if ((type == QCOW2_SUBCLUSTER_NORMAL || |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 2118 | type == QCOW2_SUBCLUSTER_ZERO_ALLOC || |
| 2119 | type == QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC) && !s->crypto) { |
Alberto Garcia | 388e581 | 2020-07-10 18:12:44 +0200 | [diff] [blame] | 2120 | *map = host_offset; |
Kevin Wolf | 37be140 | 2019-02-27 13:22:56 +0100 | [diff] [blame] | 2121 | *file = s->data_file->bs; |
Eric Blake | a320fb0 | 2018-02-13 14:26:52 -0600 | [diff] [blame] | 2122 | status |= BDRV_BLOCK_OFFSET_VALID; |
Paolo Bonzini | 4bc74be | 2013-09-04 19:00:30 +0200 | [diff] [blame] | 2123 | } |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2124 | if (type == QCOW2_SUBCLUSTER_ZERO_PLAIN || |
| 2125 | type == QCOW2_SUBCLUSTER_ZERO_ALLOC) { |
Paolo Bonzini | 4bc74be | 2013-09-04 19:00:30 +0200 | [diff] [blame] | 2126 | status |= BDRV_BLOCK_ZERO; |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 2127 | } else if (type != QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN && |
| 2128 | type != QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC) { |
Paolo Bonzini | 4bc74be | 2013-09-04 19:00:30 +0200 | [diff] [blame] | 2129 | status |= BDRV_BLOCK_DATA; |
| 2130 | } |
Vladimir Sementsov-Ogievskiy | 69f4750 | 2019-04-08 19:26:17 +0300 | [diff] [blame] | 2131 | if (s->metadata_preallocation && (status & BDRV_BLOCK_DATA) && |
| 2132 | (status & BDRV_BLOCK_OFFSET_VALID)) |
| 2133 | { |
| 2134 | status |= BDRV_BLOCK_RECURSE; |
| 2135 | } |
Paolo Bonzini | 4bc74be | 2013-09-04 19:00:30 +0200 | [diff] [blame] | 2136 | return status; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2137 | } |
| 2138 | |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 2139 | static coroutine_fn int qcow2_handle_l2meta(BlockDriverState *bs, |
| 2140 | QCowL2Meta **pl2meta, |
| 2141 | bool link_l2) |
| 2142 | { |
| 2143 | int ret = 0; |
| 2144 | QCowL2Meta *l2meta = *pl2meta; |
| 2145 | |
| 2146 | while (l2meta != NULL) { |
| 2147 | QCowL2Meta *next; |
| 2148 | |
Fam Zheng | 354d930 | 2018-06-27 11:57:51 +0800 | [diff] [blame] | 2149 | if (link_l2) { |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 2150 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
| 2151 | if (ret) { |
| 2152 | goto out; |
| 2153 | } |
Kevin Wolf | 8b24cd1 | 2018-06-28 17:05:45 +0200 | [diff] [blame] | 2154 | } else { |
| 2155 | qcow2_alloc_cluster_abort(bs, l2meta); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 2156 | } |
| 2157 | |
| 2158 | /* Take the request off the list of running requests */ |
Alberto Garcia | f7bd5bb | 2020-09-03 18:37:48 +0200 | [diff] [blame] | 2159 | QLIST_REMOVE(l2meta, next_in_flight); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 2160 | |
| 2161 | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
| 2162 | |
| 2163 | next = l2meta->next; |
| 2164 | g_free(l2meta); |
| 2165 | l2meta = next; |
| 2166 | } |
| 2167 | out: |
| 2168 | *pl2meta = l2meta; |
| 2169 | return ret; |
| 2170 | } |
| 2171 | |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2172 | static coroutine_fn int |
| 2173 | qcow2_co_preadv_encrypted(BlockDriverState *bs, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2174 | uint64_t host_offset, |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2175 | uint64_t offset, |
| 2176 | uint64_t bytes, |
| 2177 | QEMUIOVector *qiov, |
| 2178 | uint64_t qiov_offset) |
| 2179 | { |
| 2180 | int ret; |
| 2181 | BDRVQcow2State *s = bs->opaque; |
| 2182 | uint8_t *buf; |
| 2183 | |
| 2184 | assert(bs->encrypted && s->crypto); |
| 2185 | assert(bytes <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
| 2186 | |
| 2187 | /* |
| 2188 | * For encrypted images, read everything into a temporary |
| 2189 | * contiguous buffer on which the AES functions can work. |
| 2190 | * Also, decryption in a separate buffer is better as it |
| 2191 | * prevents the guest from learning information about the |
| 2192 | * encrypted nature of the virtual disk. |
| 2193 | */ |
| 2194 | |
| 2195 | buf = qemu_try_blockalign(s->data_file->bs, bytes); |
| 2196 | if (buf == NULL) { |
| 2197 | return -ENOMEM; |
| 2198 | } |
| 2199 | |
| 2200 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2201 | ret = bdrv_co_pread(s->data_file, host_offset, bytes, buf, 0); |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2202 | if (ret < 0) { |
| 2203 | goto fail; |
| 2204 | } |
| 2205 | |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2206 | if (qcow2_co_decrypt(bs, host_offset, offset, buf, bytes) < 0) |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2207 | { |
| 2208 | ret = -EIO; |
| 2209 | goto fail; |
| 2210 | } |
| 2211 | qemu_iovec_from_buf(qiov, qiov_offset, buf, bytes); |
| 2212 | |
| 2213 | fail: |
| 2214 | qemu_vfree(buf); |
| 2215 | |
| 2216 | return ret; |
| 2217 | } |
| 2218 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2219 | typedef struct Qcow2AioTask { |
| 2220 | AioTask task; |
| 2221 | |
| 2222 | BlockDriverState *bs; |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2223 | QCow2SubclusterType subcluster_type; /* only for read */ |
Vladimir Sementsov-Ogievskiy | 9a3978a | 2021-09-14 15:24:46 +0300 | [diff] [blame] | 2224 | uint64_t host_offset; /* or l2_entry for compressed read */ |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2225 | uint64_t offset; |
| 2226 | uint64_t bytes; |
| 2227 | QEMUIOVector *qiov; |
| 2228 | uint64_t qiov_offset; |
| 2229 | QCowL2Meta *l2meta; /* only for write */ |
| 2230 | } Qcow2AioTask; |
| 2231 | |
| 2232 | static coroutine_fn int qcow2_co_preadv_task_entry(AioTask *task); |
| 2233 | static coroutine_fn int qcow2_add_task(BlockDriverState *bs, |
| 2234 | AioTaskPool *pool, |
| 2235 | AioTaskFunc func, |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2236 | QCow2SubclusterType subcluster_type, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2237 | uint64_t host_offset, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2238 | uint64_t offset, |
| 2239 | uint64_t bytes, |
| 2240 | QEMUIOVector *qiov, |
| 2241 | size_t qiov_offset, |
| 2242 | QCowL2Meta *l2meta) |
| 2243 | { |
| 2244 | Qcow2AioTask local_task; |
| 2245 | Qcow2AioTask *task = pool ? g_new(Qcow2AioTask, 1) : &local_task; |
| 2246 | |
| 2247 | *task = (Qcow2AioTask) { |
| 2248 | .task.func = func, |
| 2249 | .bs = bs, |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2250 | .subcluster_type = subcluster_type, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2251 | .qiov = qiov, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2252 | .host_offset = host_offset, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2253 | .offset = offset, |
| 2254 | .bytes = bytes, |
| 2255 | .qiov_offset = qiov_offset, |
| 2256 | .l2meta = l2meta, |
| 2257 | }; |
| 2258 | |
| 2259 | trace_qcow2_add_task(qemu_coroutine_self(), bs, pool, |
| 2260 | func == qcow2_co_preadv_task_entry ? "read" : "write", |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2261 | subcluster_type, host_offset, offset, bytes, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2262 | qiov, qiov_offset); |
| 2263 | |
| 2264 | if (!pool) { |
| 2265 | return func(&task->task); |
| 2266 | } |
| 2267 | |
| 2268 | aio_task_pool_start_task(pool, &task->task); |
| 2269 | |
| 2270 | return 0; |
| 2271 | } |
| 2272 | |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2273 | static coroutine_fn int qcow2_co_preadv_task(BlockDriverState *bs, |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2274 | QCow2SubclusterType subc_type, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2275 | uint64_t host_offset, |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2276 | uint64_t offset, uint64_t bytes, |
| 2277 | QEMUIOVector *qiov, |
| 2278 | size_t qiov_offset) |
| 2279 | { |
| 2280 | BDRVQcow2State *s = bs->opaque; |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2281 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2282 | switch (subc_type) { |
| 2283 | case QCOW2_SUBCLUSTER_ZERO_PLAIN: |
| 2284 | case QCOW2_SUBCLUSTER_ZERO_ALLOC: |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2285 | /* Both zero types are handled in qcow2_co_preadv_part */ |
| 2286 | g_assert_not_reached(); |
| 2287 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2288 | case QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN: |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 2289 | case QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC: |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2290 | assert(bs->backing); /* otherwise handled in qcow2_co_preadv_part */ |
| 2291 | |
| 2292 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
| 2293 | return bdrv_co_preadv_part(bs->backing, offset, bytes, |
| 2294 | qiov, qiov_offset, 0); |
| 2295 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2296 | case QCOW2_SUBCLUSTER_COMPRESSED: |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2297 | return qcow2_co_preadv_compressed(bs, host_offset, |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2298 | offset, bytes, qiov, qiov_offset); |
| 2299 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2300 | case QCOW2_SUBCLUSTER_NORMAL: |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2301 | if (bs->encrypted) { |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2302 | return qcow2_co_preadv_encrypted(bs, host_offset, |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2303 | offset, bytes, qiov, qiov_offset); |
| 2304 | } |
| 2305 | |
| 2306 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2307 | return bdrv_co_preadv_part(s->data_file, host_offset, |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2308 | bytes, qiov, qiov_offset, 0); |
| 2309 | |
| 2310 | default: |
| 2311 | g_assert_not_reached(); |
| 2312 | } |
| 2313 | |
| 2314 | g_assert_not_reached(); |
| 2315 | } |
| 2316 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2317 | static coroutine_fn int qcow2_co_preadv_task_entry(AioTask *task) |
| 2318 | { |
| 2319 | Qcow2AioTask *t = container_of(task, Qcow2AioTask, task); |
| 2320 | |
| 2321 | assert(!t->l2meta); |
| 2322 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2323 | return qcow2_co_preadv_task(t->bs, t->subcluster_type, |
| 2324 | t->host_offset, t->offset, t->bytes, |
| 2325 | t->qiov, t->qiov_offset); |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2326 | } |
| 2327 | |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 2328 | static coroutine_fn int qcow2_co_preadv_part(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | f7ef38d | 2021-09-03 13:27:59 +0300 | [diff] [blame] | 2329 | int64_t offset, int64_t bytes, |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 2330 | QEMUIOVector *qiov, |
Vladimir Sementsov-Ogievskiy | f7ef38d | 2021-09-03 13:27:59 +0300 | [diff] [blame] | 2331 | size_t qiov_offset, |
| 2332 | BdrvRequestFlags flags) |
aliguori | 1490791 | 2008-10-31 17:28:00 +0000 | [diff] [blame] | 2333 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2334 | BDRVQcow2State *s = bs->opaque; |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2335 | int ret = 0; |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2336 | unsigned int cur_bytes; /* number of bytes in current iteration */ |
Alberto Garcia | 388e581 | 2020-07-10 18:12:44 +0200 | [diff] [blame] | 2337 | uint64_t host_offset = 0; |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2338 | QCow2SubclusterType type; |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2339 | AioTaskPool *aio = NULL; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2340 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2341 | while (bytes != 0 && aio_task_pool_status(aio) == 0) { |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2342 | /* prepare next request */ |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2343 | cur_bytes = MIN(bytes, INT_MAX); |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 2344 | if (s->crypto) { |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2345 | cur_bytes = MIN(cur_bytes, |
| 2346 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
Kevin Wolf | bd28f83 | 2010-09-13 18:08:52 +0200 | [diff] [blame] | 2347 | } |
| 2348 | |
Vladimir Sementsov-Ogievskiy | f24196d | 2019-05-06 17:27:39 +0300 | [diff] [blame] | 2349 | qemu_co_mutex_lock(&s->lock); |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 2350 | ret = qcow2_get_host_offset(bs, offset, &cur_bytes, |
| 2351 | &host_offset, &type); |
Vladimir Sementsov-Ogievskiy | f24196d | 2019-05-06 17:27:39 +0300 | [diff] [blame] | 2352 | qemu_co_mutex_unlock(&s->lock); |
Kevin Wolf | 68d100e | 2011-06-30 17:42:09 +0200 | [diff] [blame] | 2353 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2354 | goto out; |
Kevin Wolf | 171e3d6 | 2010-04-06 15:30:09 +0200 | [diff] [blame] | 2355 | } |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2356 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2357 | if (type == QCOW2_SUBCLUSTER_ZERO_PLAIN || |
| 2358 | type == QCOW2_SUBCLUSTER_ZERO_ALLOC || |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 2359 | (type == QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN && !bs->backing) || |
| 2360 | (type == QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC && !bs->backing)) |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2361 | { |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 2362 | qemu_iovec_memset(qiov, qiov_offset, 0, cur_bytes); |
Vladimir Sementsov-Ogievskiy | 88f468e | 2019-09-16 20:53:22 +0300 | [diff] [blame] | 2363 | } else { |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2364 | if (!aio && cur_bytes != bytes) { |
| 2365 | aio = aio_task_pool_new(QCOW2_MAX_WORKERS); |
| 2366 | } |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 2367 | ret = qcow2_add_task(bs, aio, qcow2_co_preadv_task_entry, type, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2368 | host_offset, offset, cur_bytes, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2369 | qiov, qiov_offset, NULL); |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2370 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2371 | goto out; |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2372 | } |
Frediano Ziglio | faf575c | 2011-08-23 15:21:14 +0200 | [diff] [blame] | 2373 | } |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2374 | |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 2375 | bytes -= cur_bytes; |
| 2376 | offset += cur_bytes; |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 2377 | qiov_offset += cur_bytes; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2378 | } |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 2379 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2380 | out: |
| 2381 | if (aio) { |
| 2382 | aio_task_pool_wait_all(aio); |
| 2383 | if (ret == 0) { |
| 2384 | ret = aio_task_pool_status(aio); |
| 2385 | } |
| 2386 | g_free(aio); |
| 2387 | } |
| 2388 | |
| 2389 | return ret; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2390 | } |
| 2391 | |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2392 | /* Check if it's possible to merge a write request with the writing of |
| 2393 | * the data from the COW regions */ |
| 2394 | static bool merge_cow(uint64_t offset, unsigned bytes, |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 2395 | QEMUIOVector *qiov, size_t qiov_offset, |
| 2396 | QCowL2Meta *l2meta) |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2397 | { |
| 2398 | QCowL2Meta *m; |
| 2399 | |
| 2400 | for (m = l2meta; m != NULL; m = m->next) { |
| 2401 | /* If both COW regions are empty then there's nothing to merge */ |
| 2402 | if (m->cow_start.nb_bytes == 0 && m->cow_end.nb_bytes == 0) { |
| 2403 | continue; |
| 2404 | } |
| 2405 | |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2406 | /* If COW regions are handled already, skip this too */ |
| 2407 | if (m->skip_cow) { |
| 2408 | continue; |
| 2409 | } |
| 2410 | |
Alberto Garcia | 3441ad4 | 2020-10-07 18:13:23 +0200 | [diff] [blame] | 2411 | /* |
| 2412 | * The write request should start immediately after the first |
| 2413 | * COW region. This does not always happen because the area |
| 2414 | * touched by the request can be larger than the one defined |
| 2415 | * by @m (a single request can span an area consisting of a |
| 2416 | * mix of previously unallocated and allocated clusters, that |
| 2417 | * is why @l2meta is a list). |
| 2418 | */ |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2419 | if (l2meta_cow_start(m) + m->cow_start.nb_bytes != offset) { |
Alberto Garcia | 3441ad4 | 2020-10-07 18:13:23 +0200 | [diff] [blame] | 2420 | /* In this case the request starts before this region */ |
| 2421 | assert(offset < l2meta_cow_start(m)); |
| 2422 | assert(m->cow_start.nb_bytes == 0); |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2423 | continue; |
| 2424 | } |
| 2425 | |
Alberto Garcia | 3441ad4 | 2020-10-07 18:13:23 +0200 | [diff] [blame] | 2426 | /* The write request should end immediately before the second |
| 2427 | * COW region (see above for why it does not always happen) */ |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2428 | if (m->offset + m->cow_end.offset != offset + bytes) { |
Alberto Garcia | 3441ad4 | 2020-10-07 18:13:23 +0200 | [diff] [blame] | 2429 | assert(offset + bytes > m->offset + m->cow_end.offset); |
| 2430 | assert(m->cow_end.nb_bytes == 0); |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2431 | continue; |
| 2432 | } |
| 2433 | |
| 2434 | /* Make sure that adding both COW regions to the QEMUIOVector |
| 2435 | * does not exceed IOV_MAX */ |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 2436 | if (qemu_iovec_subvec_niov(qiov, qiov_offset, bytes) > IOV_MAX - 2) { |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2437 | continue; |
| 2438 | } |
| 2439 | |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 2440 | m->data_qiov = qiov; |
| 2441 | m->data_qiov_offset = qiov_offset; |
Alberto Garcia | ee22a9d | 2017-06-19 16:40:08 +0300 | [diff] [blame] | 2442 | return true; |
| 2443 | } |
| 2444 | |
| 2445 | return false; |
| 2446 | } |
| 2447 | |
Alberto Garcia | 46cd1e8 | 2020-10-26 17:58:27 +0100 | [diff] [blame] | 2448 | /* |
| 2449 | * Return 1 if the COW regions read as zeroes, 0 if not, < 0 on error. |
| 2450 | * Note that returning 0 does not guarantee non-zero data. |
| 2451 | */ |
Paolo Bonzini | 050ed2e | 2022-09-22 10:49:12 +0200 | [diff] [blame] | 2452 | static int coroutine_fn is_zero_cow(BlockDriverState *bs, QCowL2Meta *m) |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2453 | { |
| 2454 | /* |
| 2455 | * This check is designed for optimization shortcut so it must be |
| 2456 | * efficient. |
Alberto Garcia | 46cd1e8 | 2020-10-26 17:58:27 +0100 | [diff] [blame] | 2457 | * Instead of is_zero(), use bdrv_co_is_zero_fast() as it is |
| 2458 | * faster (but not as accurate and can result in false negatives). |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2459 | */ |
Alberto Garcia | 46cd1e8 | 2020-10-26 17:58:27 +0100 | [diff] [blame] | 2460 | int ret = bdrv_co_is_zero_fast(bs, m->offset + m->cow_start.offset, |
| 2461 | m->cow_start.nb_bytes); |
| 2462 | if (ret <= 0) { |
| 2463 | return ret; |
| 2464 | } |
| 2465 | |
| 2466 | return bdrv_co_is_zero_fast(bs, m->offset + m->cow_end.offset, |
| 2467 | m->cow_end.nb_bytes); |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2468 | } |
| 2469 | |
Paolo Bonzini | 050ed2e | 2022-09-22 10:49:12 +0200 | [diff] [blame] | 2470 | static int coroutine_fn handle_alloc_space(BlockDriverState *bs, |
| 2471 | QCowL2Meta *l2meta) |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2472 | { |
| 2473 | BDRVQcow2State *s = bs->opaque; |
| 2474 | QCowL2Meta *m; |
| 2475 | |
| 2476 | if (!(s->data_file->bs->supported_zero_flags & BDRV_REQ_NO_FALLBACK)) { |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
| 2480 | if (bs->encrypted) { |
| 2481 | return 0; |
| 2482 | } |
| 2483 | |
| 2484 | for (m = l2meta; m != NULL; m = m->next) { |
| 2485 | int ret; |
Alberto Garcia | bf4a66e | 2020-07-10 18:13:09 +0200 | [diff] [blame] | 2486 | uint64_t start_offset = m->alloc_offset + m->cow_start.offset; |
| 2487 | unsigned nb_bytes = m->cow_end.offset + m->cow_end.nb_bytes - |
| 2488 | m->cow_start.offset; |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2489 | |
| 2490 | if (!m->cow_start.nb_bytes && !m->cow_end.nb_bytes) { |
| 2491 | continue; |
| 2492 | } |
| 2493 | |
Alberto Garcia | 46cd1e8 | 2020-10-26 17:58:27 +0100 | [diff] [blame] | 2494 | ret = is_zero_cow(bs, m); |
| 2495 | if (ret < 0) { |
| 2496 | return ret; |
| 2497 | } else if (ret == 0) { |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2498 | continue; |
| 2499 | } |
| 2500 | |
| 2501 | /* |
| 2502 | * instead of writing zero COW buffers, |
| 2503 | * efficiently zero out the whole clusters |
| 2504 | */ |
| 2505 | |
Alberto Garcia | bf4a66e | 2020-07-10 18:13:09 +0200 | [diff] [blame] | 2506 | ret = qcow2_pre_write_overlap_check(bs, 0, start_offset, nb_bytes, |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2507 | true); |
| 2508 | if (ret < 0) { |
| 2509 | return ret; |
| 2510 | } |
| 2511 | |
| 2512 | BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC_SPACE); |
Alberto Garcia | bf4a66e | 2020-07-10 18:13:09 +0200 | [diff] [blame] | 2513 | ret = bdrv_co_pwrite_zeroes(s->data_file, start_offset, nb_bytes, |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2514 | BDRV_REQ_NO_FALLBACK); |
| 2515 | if (ret < 0) { |
| 2516 | if (ret != -ENOTSUP && ret != -EAGAIN) { |
| 2517 | return ret; |
| 2518 | } |
| 2519 | continue; |
| 2520 | } |
| 2521 | |
| 2522 | trace_qcow2_skip_cow(qemu_coroutine_self(), m->offset, m->nb_clusters); |
| 2523 | m->skip_cow = true; |
| 2524 | } |
| 2525 | return 0; |
| 2526 | } |
| 2527 | |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2528 | /* |
| 2529 | * qcow2_co_pwritev_task |
| 2530 | * Called with s->lock unlocked |
| 2531 | * l2meta - if not NULL, qcow2_co_pwritev_task() will consume it. Caller must |
| 2532 | * not use it somehow after qcow2_co_pwritev_task() call |
| 2533 | */ |
| 2534 | static coroutine_fn int qcow2_co_pwritev_task(BlockDriverState *bs, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2535 | uint64_t host_offset, |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2536 | uint64_t offset, uint64_t bytes, |
| 2537 | QEMUIOVector *qiov, |
| 2538 | uint64_t qiov_offset, |
| 2539 | QCowL2Meta *l2meta) |
| 2540 | { |
| 2541 | int ret; |
| 2542 | BDRVQcow2State *s = bs->opaque; |
| 2543 | void *crypt_buf = NULL; |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2544 | QEMUIOVector encrypted_qiov; |
| 2545 | |
| 2546 | if (bs->encrypted) { |
| 2547 | assert(s->crypto); |
| 2548 | assert(bytes <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
| 2549 | crypt_buf = qemu_try_blockalign(bs->file->bs, bytes); |
| 2550 | if (crypt_buf == NULL) { |
| 2551 | ret = -ENOMEM; |
| 2552 | goto out_unlocked; |
| 2553 | } |
| 2554 | qemu_iovec_to_buf(qiov, qiov_offset, crypt_buf, bytes); |
| 2555 | |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2556 | if (qcow2_co_encrypt(bs, host_offset, offset, crypt_buf, bytes) < 0) { |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2557 | ret = -EIO; |
| 2558 | goto out_unlocked; |
| 2559 | } |
| 2560 | |
| 2561 | qemu_iovec_init_buf(&encrypted_qiov, crypt_buf, bytes); |
| 2562 | qiov = &encrypted_qiov; |
| 2563 | qiov_offset = 0; |
| 2564 | } |
| 2565 | |
| 2566 | /* Try to efficiently initialize the physical space with zeroes */ |
| 2567 | ret = handle_alloc_space(bs, l2meta); |
| 2568 | if (ret < 0) { |
| 2569 | goto out_unlocked; |
| 2570 | } |
| 2571 | |
| 2572 | /* |
| 2573 | * If we need to do COW, check if it's possible to merge the |
| 2574 | * writing of the guest data together with that of the COW regions. |
| 2575 | * If it's not possible (or not necessary) then write the |
| 2576 | * guest data now. |
| 2577 | */ |
| 2578 | if (!merge_cow(offset, bytes, qiov, qiov_offset, l2meta)) { |
| 2579 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2580 | trace_qcow2_writev_data(qemu_coroutine_self(), host_offset); |
| 2581 | ret = bdrv_co_pwritev_part(s->data_file, host_offset, |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2582 | bytes, qiov, qiov_offset, 0); |
| 2583 | if (ret < 0) { |
| 2584 | goto out_unlocked; |
| 2585 | } |
| 2586 | } |
| 2587 | |
| 2588 | qemu_co_mutex_lock(&s->lock); |
| 2589 | |
| 2590 | ret = qcow2_handle_l2meta(bs, &l2meta, true); |
| 2591 | goto out_locked; |
| 2592 | |
| 2593 | out_unlocked: |
| 2594 | qemu_co_mutex_lock(&s->lock); |
| 2595 | |
| 2596 | out_locked: |
| 2597 | qcow2_handle_l2meta(bs, &l2meta, false); |
| 2598 | qemu_co_mutex_unlock(&s->lock); |
| 2599 | |
| 2600 | qemu_vfree(crypt_buf); |
| 2601 | |
| 2602 | return ret; |
| 2603 | } |
| 2604 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2605 | static coroutine_fn int qcow2_co_pwritev_task_entry(AioTask *task) |
| 2606 | { |
| 2607 | Qcow2AioTask *t = container_of(task, Qcow2AioTask, task); |
| 2608 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 2609 | assert(!t->subcluster_type); |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2610 | |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2611 | return qcow2_co_pwritev_task(t->bs, t->host_offset, |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2612 | t->offset, t->bytes, t->qiov, t->qiov_offset, |
| 2613 | t->l2meta); |
| 2614 | } |
| 2615 | |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 2616 | static coroutine_fn int qcow2_co_pwritev_part( |
Vladimir Sementsov-Ogievskiy | e75abed | 2021-09-03 13:28:00 +0300 | [diff] [blame] | 2617 | BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 2618 | QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2619 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2620 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2621 | int offset_in_cluster; |
Kevin Wolf | 68d100e | 2011-06-30 17:42:09 +0200 | [diff] [blame] | 2622 | int ret; |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2623 | unsigned int cur_bytes; /* number of sectors in current iteration */ |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 2624 | uint64_t host_offset; |
Kevin Wolf | 8d2497c | 2013-01-14 17:31:31 +0100 | [diff] [blame] | 2625 | QCowL2Meta *l2meta = NULL; |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2626 | AioTaskPool *aio = NULL; |
Frediano Ziglio | c227140 | 2011-08-23 15:21:15 +0200 | [diff] [blame] | 2627 | |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2628 | trace_qcow2_writev_start_req(qemu_coroutine_self(), offset, bytes); |
Kevin Wolf | 3cce16f | 2012-03-01 18:36:21 +0100 | [diff] [blame] | 2629 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2630 | while (bytes != 0 && aio_task_pool_status(aio) == 0) { |
Frediano Ziglio | 3fc48d0 | 2011-08-23 15:21:19 +0200 | [diff] [blame] | 2631 | |
Kevin Wolf | f50f88b | 2012-12-07 18:08:46 +0100 | [diff] [blame] | 2632 | l2meta = NULL; |
Kevin Wolf | cf5c1a2 | 2012-12-07 18:08:44 +0100 | [diff] [blame] | 2633 | |
Kevin Wolf | 3cce16f | 2012-03-01 18:36:21 +0100 | [diff] [blame] | 2634 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2635 | offset_in_cluster = offset_into_cluster(s, offset); |
| 2636 | cur_bytes = MIN(bytes, INT_MAX); |
| 2637 | if (bs->encrypted) { |
| 2638 | cur_bytes = MIN(cur_bytes, |
| 2639 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
| 2640 | - offset_in_cluster); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2641 | } |
Kevin Wolf | 6f5f060 | 2010-09-13 18:24:10 +0200 | [diff] [blame] | 2642 | |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2643 | qemu_co_mutex_lock(&s->lock); |
| 2644 | |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 2645 | ret = qcow2_alloc_host_offset(bs, offset, &cur_bytes, |
| 2646 | &host_offset, &l2meta); |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2647 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 5447c3a | 2019-05-06 17:27:40 +0300 | [diff] [blame] | 2648 | goto out_locked; |
Frediano Ziglio | 5ebaa27 | 2011-08-23 15:21:18 +0200 | [diff] [blame] | 2649 | } |
Kevin Wolf | 6f5f060 | 2010-09-13 18:24:10 +0200 | [diff] [blame] | 2650 | |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 2651 | ret = qcow2_pre_write_overlap_check(bs, 0, host_offset, |
Vladimir Sementsov-Ogievskiy | 5447c3a | 2019-05-06 17:27:40 +0300 | [diff] [blame] | 2652 | cur_bytes, true); |
| 2653 | if (ret < 0) { |
| 2654 | goto out_locked; |
| 2655 | } |
| 2656 | |
| 2657 | qemu_co_mutex_unlock(&s->lock); |
| 2658 | |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2659 | if (!aio && cur_bytes != bytes) { |
| 2660 | aio = aio_task_pool_new(QCOW2_MAX_WORKERS); |
| 2661 | } |
| 2662 | ret = qcow2_add_task(bs, aio, qcow2_co_pwritev_task_entry, 0, |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 2663 | host_offset, offset, |
Alberto Garcia | 9c4269d | 2020-07-10 18:12:43 +0200 | [diff] [blame] | 2664 | cur_bytes, qiov, qiov_offset, l2meta); |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2665 | l2meta = NULL; /* l2meta is consumed by qcow2_co_pwritev_task() */ |
Anton Nefedov | c8bb23c | 2019-05-16 17:27:49 +0300 | [diff] [blame] | 2666 | if (ret < 0) { |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2667 | goto fail_nometa; |
Kevin Wolf | f50f88b | 2012-12-07 18:08:46 +0100 | [diff] [blame] | 2668 | } |
Kevin Wolf | 0fa9131 | 2011-09-01 15:02:13 +0200 | [diff] [blame] | 2669 | |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2670 | bytes -= cur_bytes; |
| 2671 | offset += cur_bytes; |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2672 | qiov_offset += cur_bytes; |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 2673 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_bytes); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2674 | } |
Frediano Ziglio | 3fc48d0 | 2011-08-23 15:21:19 +0200 | [diff] [blame] | 2675 | ret = 0; |
Kevin Wolf | 6f5f060 | 2010-09-13 18:24:10 +0200 | [diff] [blame] | 2676 | |
Vladimir Sementsov-Ogievskiy | 5447c3a | 2019-05-06 17:27:40 +0300 | [diff] [blame] | 2677 | qemu_co_mutex_lock(&s->lock); |
| 2678 | |
| 2679 | out_locked: |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 2680 | qcow2_handle_l2meta(bs, &l2meta, false); |
Kevin Wolf | 0fa9131 | 2011-09-01 15:02:13 +0200 | [diff] [blame] | 2681 | |
Paolo Bonzini | a8c5740 | 2017-06-29 15:27:39 +0200 | [diff] [blame] | 2682 | qemu_co_mutex_unlock(&s->lock); |
| 2683 | |
Vladimir Sementsov-Ogievskiy | 6aa7a26 | 2019-09-16 20:53:23 +0300 | [diff] [blame] | 2684 | fail_nometa: |
Vladimir Sementsov-Ogievskiy | d710cf5 | 2019-09-16 20:53:24 +0300 | [diff] [blame] | 2685 | if (aio) { |
| 2686 | aio_task_pool_wait_all(aio); |
| 2687 | if (ret == 0) { |
| 2688 | ret = aio_task_pool_status(aio); |
| 2689 | } |
| 2690 | g_free(aio); |
| 2691 | } |
| 2692 | |
Kevin Wolf | 3cce16f | 2012-03-01 18:36:21 +0100 | [diff] [blame] | 2693 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
Kevin Wolf | 42496d6 | 2011-06-07 15:04:32 +0200 | [diff] [blame] | 2694 | |
Kevin Wolf | 68d100e | 2011-06-30 17:42:09 +0200 | [diff] [blame] | 2695 | return ret; |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2696 | } |
| 2697 | |
Kevin Wolf | ec6d891 | 2015-12-22 16:04:57 +0100 | [diff] [blame] | 2698 | static int qcow2_inactivate(BlockDriverState *bs) |
| 2699 | { |
| 2700 | BDRVQcow2State *s = bs->opaque; |
| 2701 | int ret, result = 0; |
Vladimir Sementsov-Ogievskiy | 5f72826 | 2017-06-28 15:05:19 +0300 | [diff] [blame] | 2702 | Error *local_err = NULL; |
Kevin Wolf | ec6d891 | 2015-12-22 16:04:57 +0100 | [diff] [blame] | 2703 | |
Vladimir Sementsov-Ogievskiy | 644ddbb | 2019-09-27 15:23:52 +0300 | [diff] [blame] | 2704 | qcow2_store_persistent_dirty_bitmaps(bs, true, &local_err); |
Pavel Butsykin | 83a8c77 | 2017-09-04 13:18:00 +0300 | [diff] [blame] | 2705 | if (local_err != NULL) { |
| 2706 | result = -EINVAL; |
Vladimir Sementsov-Ogievskiy | 132adb6 | 2018-10-29 16:23:15 -0400 | [diff] [blame] | 2707 | error_reportf_err(local_err, "Lost persistent bitmaps during " |
| 2708 | "inactivation of node '%s': ", |
| 2709 | bdrv_get_device_or_node_name(bs)); |
Pavel Butsykin | 83a8c77 | 2017-09-04 13:18:00 +0300 | [diff] [blame] | 2710 | } |
| 2711 | |
Kevin Wolf | ec6d891 | 2015-12-22 16:04:57 +0100 | [diff] [blame] | 2712 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
| 2713 | if (ret) { |
| 2714 | result = ret; |
| 2715 | error_report("Failed to flush the L2 table cache: %s", |
| 2716 | strerror(-ret)); |
| 2717 | } |
| 2718 | |
| 2719 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); |
| 2720 | if (ret) { |
| 2721 | result = ret; |
| 2722 | error_report("Failed to flush the refcount block cache: %s", |
| 2723 | strerror(-ret)); |
| 2724 | } |
| 2725 | |
| 2726 | if (result == 0) { |
| 2727 | qcow2_mark_clean(bs); |
| 2728 | } |
| 2729 | |
| 2730 | return result; |
| 2731 | } |
| 2732 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2733 | static void qcow2_do_close(BlockDriverState *bs, bool close_data_file) |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2734 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2735 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | de82815 | 2014-05-20 17:12:47 +0200 | [diff] [blame] | 2736 | qemu_vfree(s->l1_table); |
Max Reitz | cf93980 | 2013-08-30 14:34:26 +0200 | [diff] [blame] | 2737 | /* else pre-write overlap checks in cache_destroy may crash */ |
| 2738 | s->l1_table = NULL; |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 2739 | |
Kevin Wolf | 140fd5a | 2015-12-22 16:10:32 +0100 | [diff] [blame] | 2740 | if (!(s->flags & BDRV_O_INACTIVE)) { |
Kevin Wolf | ec6d891 | 2015-12-22 16:04:57 +0100 | [diff] [blame] | 2741 | qcow2_inactivate(bs); |
Kevin Wolf | 27eb6c0 | 2014-03-11 15:15:03 +0100 | [diff] [blame] | 2742 | } |
Stefan Hajnoczi | c61d000 | 2012-07-27 09:05:19 +0100 | [diff] [blame] | 2743 | |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 2744 | cache_clean_timer_del(bs); |
Alberto Garcia | e64d407 | 2018-02-05 16:33:08 +0200 | [diff] [blame] | 2745 | qcow2_cache_destroy(s->l2_table_cache); |
| 2746 | qcow2_cache_destroy(s->refcount_block_cache); |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 2747 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 2748 | qcrypto_block_free(s->crypto); |
| 2749 | s->crypto = NULL; |
Pan Nengyuan | 4aebf0f | 2020-02-27 09:29:49 +0800 | [diff] [blame] | 2750 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); |
Daniel P. Berrange | f6fa64f | 2015-07-01 18:10:37 +0100 | [diff] [blame] | 2751 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2752 | g_free(s->unknown_header_fields); |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 2753 | cleanup_unknown_header_ext(bs); |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2754 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 2755 | g_free(s->image_data_file); |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 2756 | g_free(s->image_backing_file); |
| 2757 | g_free(s->image_backing_format); |
| 2758 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2759 | if (close_data_file && has_data_file(bs)) { |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 2760 | bdrv_unref_child(bs, s->data_file); |
Vladimir Sementsov-Ogievskiy | 808cf3c | 2020-03-16 09:06:31 +0300 | [diff] [blame] | 2761 | s->data_file = NULL; |
Kevin Wolf | 0e8c08b | 2019-01-29 17:13:57 +0100 | [diff] [blame] | 2762 | } |
| 2763 | |
Kevin Wolf | ed6ccf0 | 2009-05-28 16:07:07 +0200 | [diff] [blame] | 2764 | qcow2_refcount_close(bs); |
Li Zhi Hui | 28c1202 | 2011-12-07 17:25:48 +0800 | [diff] [blame] | 2765 | qcow2_free_snapshots(bs); |
bellard | 585f858 | 2006-08-05 21:14:20 +0000 | [diff] [blame] | 2766 | } |
| 2767 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2768 | static void qcow2_close(BlockDriverState *bs) |
| 2769 | { |
| 2770 | qcow2_do_close(bs, true); |
| 2771 | } |
| 2772 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 2773 | static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs, |
| 2774 | Error **errp) |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2775 | { |
Vladimir Sementsov-Ogievskiy | e6247c9 | 2021-02-02 15:49:54 +0300 | [diff] [blame] | 2776 | ERRP_GUARD(); |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2777 | BDRVQcow2State *s = bs->opaque; |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2778 | BdrvChild *data_file; |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2779 | int flags = s->flags; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 2780 | QCryptoBlock *crypto = NULL; |
Kevin Wolf | acdfb48 | 2013-03-18 13:08:10 +0100 | [diff] [blame] | 2781 | QDict *options; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 2782 | int ret; |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2783 | |
| 2784 | /* |
| 2785 | * Backing files are read-only which makes all of their metadata immutable, |
| 2786 | * that means we don't have to worry about reopening them here. |
| 2787 | */ |
| 2788 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 2789 | crypto = s->crypto; |
| 2790 | s->crypto = NULL; |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2791 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2792 | /* |
| 2793 | * Do not reopen s->data_file (i.e., have qcow2_do_close() not close it, |
| 2794 | * and then prevent qcow2_do_open() from opening it), because this function |
| 2795 | * runs in the I/O path and as such we must not invoke global-state |
| 2796 | * functions like bdrv_unref_child() and bdrv_open_child(). |
| 2797 | */ |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2798 | |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2799 | qcow2_do_close(bs, false); |
| 2800 | |
| 2801 | data_file = s->data_file; |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2802 | memset(s, 0, sizeof(BDRVQcow2State)); |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2803 | s->data_file = data_file; |
| 2804 | |
Kevin Wolf | d475e5a | 2014-03-11 17:42:41 +0100 | [diff] [blame] | 2805 | options = qdict_clone_shallow(bs->options); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 2806 | |
Kevin Wolf | 140fd5a | 2015-12-22 16:10:32 +0100 | [diff] [blame] | 2807 | flags &= ~BDRV_O_INACTIVE; |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 2808 | qemu_co_mutex_lock(&s->lock); |
Hanna Reitz | 06e9cd1 | 2022-04-27 13:40:55 +0200 | [diff] [blame] | 2809 | ret = qcow2_do_open(bs, options, flags, false, errp); |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 2810 | qemu_co_mutex_unlock(&s->lock); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2811 | qobject_unref(options); |
Vladimir Sementsov-Ogievskiy | e6247c9 | 2021-02-02 15:49:54 +0300 | [diff] [blame] | 2812 | if (ret < 0) { |
| 2813 | error_prepend(errp, "Could not reopen qcow2 layer: "); |
Kevin Wolf | 191fb11 | 2015-12-22 16:14:10 +0100 | [diff] [blame] | 2814 | bs->drv = NULL; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 2815 | return; |
| 2816 | } |
Kevin Wolf | acdfb48 | 2013-03-18 13:08:10 +0100 | [diff] [blame] | 2817 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 2818 | s->crypto = crypto; |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 2819 | } |
| 2820 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2821 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
| 2822 | size_t len, size_t buflen) |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2823 | { |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2824 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; |
| 2825 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2826 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2827 | if (buflen < ext_len) { |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2828 | return -ENOSPC; |
| 2829 | } |
| 2830 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2831 | *ext_backing_fmt = (QCowExtension) { |
| 2832 | .magic = cpu_to_be32(magic), |
| 2833 | .len = cpu_to_be32(len), |
| 2834 | }; |
Stefan Hajnoczi | 0647d47 | 2016-09-13 09:56:27 +0100 | [diff] [blame] | 2835 | |
| 2836 | if (len) { |
| 2837 | memcpy(buf + sizeof(QCowExtension), s, len); |
| 2838 | } |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2839 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2840 | return ext_len; |
| 2841 | } |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2842 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2843 | /* |
| 2844 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
| 2845 | * the backing file name and all extensions. qcow2 was not designed to allow |
| 2846 | * such changes, so if we run out of space (we can only use the first cluster) |
| 2847 | * this function may fail. |
| 2848 | * |
| 2849 | * Returns 0 on success, -errno in error cases. |
| 2850 | */ |
| 2851 | int qcow2_update_header(BlockDriverState *bs) |
| 2852 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 2853 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2854 | QCowHeader *header; |
| 2855 | char *buf; |
| 2856 | size_t buflen = s->cluster_size; |
| 2857 | int ret; |
| 2858 | uint64_t total_size; |
| 2859 | uint32_t refcount_table_clusters; |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2860 | size_t header_length; |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 2861 | Qcow2UnknownHeaderExtension *uext; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2862 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2863 | buf = qemu_blockalign(bs, buflen); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2864 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2865 | /* Header structure */ |
| 2866 | header = (QCowHeader*) buf; |
| 2867 | |
| 2868 | if (buflen < sizeof(*header)) { |
| 2869 | ret = -ENOSPC; |
| 2870 | goto fail; |
| 2871 | } |
| 2872 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2873 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2874 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
| 2875 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); |
| 2876 | |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 2877 | ret = validate_compression_type(s, NULL); |
| 2878 | if (ret) { |
| 2879 | goto fail; |
| 2880 | } |
| 2881 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2882 | *header = (QCowHeader) { |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2883 | /* Version 2 fields */ |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2884 | .magic = cpu_to_be32(QCOW_MAGIC), |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2885 | .version = cpu_to_be32(s->qcow_version), |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2886 | .backing_file_offset = 0, |
| 2887 | .backing_file_size = 0, |
| 2888 | .cluster_bits = cpu_to_be32(s->cluster_bits), |
| 2889 | .size = cpu_to_be64(total_size), |
| 2890 | .crypt_method = cpu_to_be32(s->crypt_method_header), |
| 2891 | .l1_size = cpu_to_be32(s->l1_size), |
| 2892 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), |
| 2893 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), |
| 2894 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), |
| 2895 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), |
| 2896 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2897 | |
| 2898 | /* Version 3 fields */ |
| 2899 | .incompatible_features = cpu_to_be64(s->incompatible_features), |
| 2900 | .compatible_features = cpu_to_be64(s->compatible_features), |
| 2901 | .autoclear_features = cpu_to_be64(s->autoclear_features), |
Max Reitz | b6481f3 | 2013-09-03 10:09:53 +0200 | [diff] [blame] | 2902 | .refcount_order = cpu_to_be32(s->refcount_order), |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2903 | .header_length = cpu_to_be32(header_length), |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 2904 | .compression_type = s->compression_type, |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2905 | }; |
| 2906 | |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2907 | /* For older versions, write a shorter header */ |
| 2908 | switch (s->qcow_version) { |
| 2909 | case 2: |
| 2910 | ret = offsetof(QCowHeader, incompatible_features); |
| 2911 | break; |
| 2912 | case 3: |
| 2913 | ret = sizeof(*header); |
| 2914 | break; |
| 2915 | default: |
Jim Meyering | b6c1476 | 2012-05-21 13:06:54 +0200 | [diff] [blame] | 2916 | ret = -EINVAL; |
| 2917 | goto fail; |
Kevin Wolf | 6744cba | 2011-12-15 12:20:58 +0100 | [diff] [blame] | 2918 | } |
| 2919 | |
| 2920 | buf += ret; |
| 2921 | buflen -= ret; |
| 2922 | memset(buf, 0, buflen); |
| 2923 | |
| 2924 | /* Preserve any unknown field in the header */ |
| 2925 | if (s->unknown_header_fields_size) { |
| 2926 | if (buflen < s->unknown_header_fields_size) { |
| 2927 | ret = -ENOSPC; |
| 2928 | goto fail; |
| 2929 | } |
| 2930 | |
| 2931 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); |
| 2932 | buf += s->unknown_header_fields_size; |
| 2933 | buflen -= s->unknown_header_fields_size; |
| 2934 | } |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2935 | |
| 2936 | /* Backing file format header extension */ |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 2937 | if (s->image_backing_format) { |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2938 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 2939 | s->image_backing_format, |
| 2940 | strlen(s->image_backing_format), |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2941 | buflen); |
| 2942 | if (ret < 0) { |
| 2943 | goto fail; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2944 | } |
| 2945 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 2946 | buf += ret; |
| 2947 | buflen -= ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2948 | } |
| 2949 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 2950 | /* External data file header extension */ |
| 2951 | if (has_data_file(bs) && s->image_data_file) { |
| 2952 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_DATA_FILE, |
| 2953 | s->image_data_file, strlen(s->image_data_file), |
| 2954 | buflen); |
| 2955 | if (ret < 0) { |
| 2956 | goto fail; |
| 2957 | } |
| 2958 | |
| 2959 | buf += ret; |
| 2960 | buflen -= ret; |
| 2961 | } |
| 2962 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 2963 | /* Full disk encryption header pointer extension */ |
| 2964 | if (s->crypto_header.offset != 0) { |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 2965 | s->crypto_header.offset = cpu_to_be64(s->crypto_header.offset); |
| 2966 | s->crypto_header.length = cpu_to_be64(s->crypto_header.length); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 2967 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_CRYPTO_HEADER, |
| 2968 | &s->crypto_header, sizeof(s->crypto_header), |
| 2969 | buflen); |
Peter Maydell | 3b698f5 | 2018-10-09 18:24:59 +0100 | [diff] [blame] | 2970 | s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); |
| 2971 | s->crypto_header.length = be64_to_cpu(s->crypto_header.length); |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 2972 | if (ret < 0) { |
| 2973 | goto fail; |
| 2974 | } |
| 2975 | buf += ret; |
| 2976 | buflen -= ret; |
| 2977 | } |
| 2978 | |
Eric Blake | e7be13a | 2020-03-24 12:42:32 -0500 | [diff] [blame] | 2979 | /* |
| 2980 | * Feature table. A mere 8 feature names occupies 392 bytes, and |
| 2981 | * when coupled with the v3 minimum header of 104 bytes plus the |
| 2982 | * 8-byte end-of-extension marker, that would leave only 8 bytes |
| 2983 | * for a backing file name in an image with 512-byte clusters. |
| 2984 | * Thus, we choose to omit this header for cluster sizes 4k and |
| 2985 | * smaller. |
| 2986 | */ |
| 2987 | if (s->qcow_version >= 3 && s->cluster_size > 4096) { |
Eric Blake | bb40ebc | 2020-03-24 12:42:31 -0500 | [diff] [blame] | 2988 | static const Qcow2Feature features[] = { |
Kevin Wolf | 1a4828c | 2015-12-02 19:11:04 +0100 | [diff] [blame] | 2989 | { |
| 2990 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
| 2991 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, |
| 2992 | .name = "dirty bit", |
| 2993 | }, |
| 2994 | { |
| 2995 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
| 2996 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, |
| 2997 | .name = "corrupt bit", |
| 2998 | }, |
| 2999 | { |
Kevin Wolf | 93c2493 | 2019-01-14 16:48:25 +0100 | [diff] [blame] | 3000 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
| 3001 | .bit = QCOW2_INCOMPAT_DATA_FILE_BITNR, |
| 3002 | .name = "external data file", |
| 3003 | }, |
| 3004 | { |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3005 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
| 3006 | .bit = QCOW2_INCOMPAT_COMPRESSION_BITNR, |
| 3007 | .name = "compression type", |
| 3008 | }, |
| 3009 | { |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3010 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
| 3011 | .bit = QCOW2_INCOMPAT_EXTL2_BITNR, |
| 3012 | .name = "extended L2 entries", |
| 3013 | }, |
| 3014 | { |
Kevin Wolf | 1a4828c | 2015-12-02 19:11:04 +0100 | [diff] [blame] | 3015 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, |
| 3016 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, |
| 3017 | .name = "lazy refcounts", |
| 3018 | }, |
Eric Blake | bb40ebc | 2020-03-24 12:42:31 -0500 | [diff] [blame] | 3019 | { |
| 3020 | .type = QCOW2_FEAT_TYPE_AUTOCLEAR, |
| 3021 | .bit = QCOW2_AUTOCLEAR_BITMAPS_BITNR, |
| 3022 | .name = "bitmaps", |
| 3023 | }, |
| 3024 | { |
| 3025 | .type = QCOW2_FEAT_TYPE_AUTOCLEAR, |
| 3026 | .bit = QCOW2_AUTOCLEAR_DATA_FILE_RAW_BITNR, |
| 3027 | .name = "raw external data", |
| 3028 | }, |
Kevin Wolf | 1a4828c | 2015-12-02 19:11:04 +0100 | [diff] [blame] | 3029 | }; |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 3030 | |
Kevin Wolf | 1a4828c | 2015-12-02 19:11:04 +0100 | [diff] [blame] | 3031 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, |
| 3032 | features, sizeof(features), buflen); |
| 3033 | if (ret < 0) { |
| 3034 | goto fail; |
| 3035 | } |
| 3036 | buf += ret; |
| 3037 | buflen -= ret; |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 3038 | } |
Kevin Wolf | cfcc4c6 | 2012-04-12 15:20:27 +0200 | [diff] [blame] | 3039 | |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 3040 | /* Bitmap extension */ |
| 3041 | if (s->nb_bitmaps > 0) { |
| 3042 | Qcow2BitmapHeaderExt bitmaps_header = { |
| 3043 | .nb_bitmaps = cpu_to_be32(s->nb_bitmaps), |
| 3044 | .bitmap_directory_size = |
| 3045 | cpu_to_be64(s->bitmap_directory_size), |
| 3046 | .bitmap_directory_offset = |
| 3047 | cpu_to_be64(s->bitmap_directory_offset) |
| 3048 | }; |
| 3049 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BITMAPS, |
| 3050 | &bitmaps_header, sizeof(bitmaps_header), |
| 3051 | buflen); |
| 3052 | if (ret < 0) { |
| 3053 | goto fail; |
| 3054 | } |
| 3055 | buf += ret; |
| 3056 | buflen -= ret; |
| 3057 | } |
| 3058 | |
Kevin Wolf | 75bab85 | 2012-02-02 14:52:08 +0100 | [diff] [blame] | 3059 | /* Keep unknown header extensions */ |
| 3060 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { |
| 3061 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); |
| 3062 | if (ret < 0) { |
| 3063 | goto fail; |
| 3064 | } |
| 3065 | |
| 3066 | buf += ret; |
| 3067 | buflen -= ret; |
| 3068 | } |
| 3069 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3070 | /* End of header extensions */ |
| 3071 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3072 | if (ret < 0) { |
| 3073 | goto fail; |
| 3074 | } |
| 3075 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3076 | buf += ret; |
| 3077 | buflen -= ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3078 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3079 | /* Backing file name */ |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 3080 | if (s->image_backing_file) { |
| 3081 | size_t backing_file_len = strlen(s->image_backing_file); |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3082 | |
| 3083 | if (buflen < backing_file_len) { |
| 3084 | ret = -ENOSPC; |
| 3085 | goto fail; |
| 3086 | } |
| 3087 | |
Jim Meyering | 00ea188 | 2012-10-04 13:10:01 +0200 | [diff] [blame] | 3088 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 3089 | strncpy(buf, s->image_backing_file, buflen); |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3090 | |
| 3091 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); |
| 3092 | header->backing_file_size = cpu_to_be32(backing_file_len); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3093 | } |
| 3094 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3095 | /* Write the new header */ |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 3096 | ret = bdrv_pwrite(bs->file, 0, s->cluster_size, header, 0); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3097 | if (ret < 0) { |
| 3098 | goto fail; |
| 3099 | } |
| 3100 | |
| 3101 | ret = 0; |
| 3102 | fail: |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3103 | qemu_vfree(header); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3104 | return ret; |
| 3105 | } |
| 3106 | |
| 3107 | static int qcow2_change_backing_file(BlockDriverState *bs, |
| 3108 | const char *backing_file, const char *backing_fmt) |
| 3109 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 3110 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 3111 | |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3112 | /* Adding a backing file means that the external data file alone won't be |
| 3113 | * enough to make sense of the content */ |
| 3114 | if (backing_file && data_file_is_raw(bs)) { |
| 3115 | return -EINVAL; |
| 3116 | } |
| 3117 | |
Max Reitz | 4e876bc | 2016-04-06 18:32:48 +0200 | [diff] [blame] | 3118 | if (backing_file && strlen(backing_file) > 1023) { |
| 3119 | return -EINVAL; |
| 3120 | } |
| 3121 | |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 3122 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 3123 | backing_file ?: ""); |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3124 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 3125 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 3126 | |
Kevin Wolf | e4603fe | 2015-04-07 15:03:16 +0200 | [diff] [blame] | 3127 | g_free(s->image_backing_file); |
| 3128 | g_free(s->image_backing_format); |
| 3129 | |
| 3130 | s->image_backing_file = backing_file ? g_strdup(bs->backing_file) : NULL; |
| 3131 | s->image_backing_format = backing_fmt ? g_strdup(bs->backing_format) : NULL; |
| 3132 | |
Kevin Wolf | e24e49e | 2012-02-02 12:32:31 +0100 | [diff] [blame] | 3133 | return qcow2_update_header(bs); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3134 | } |
| 3135 | |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3136 | static int qcow2_set_up_encryption(BlockDriverState *bs, |
| 3137 | QCryptoBlockCreateOptions *cryptoopts, |
| 3138 | Error **errp) |
| 3139 | { |
| 3140 | BDRVQcow2State *s = bs->opaque; |
| 3141 | QCryptoBlock *crypto = NULL; |
| 3142 | int fmt, ret; |
| 3143 | |
| 3144 | switch (cryptoopts->format) { |
| 3145 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: |
| 3146 | fmt = QCOW_CRYPT_LUKS; |
| 3147 | break; |
| 3148 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
| 3149 | fmt = QCOW_CRYPT_AES; |
| 3150 | break; |
| 3151 | default: |
| 3152 | error_setg(errp, "Crypto format not supported in qcow2"); |
| 3153 | return -EINVAL; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3154 | } |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3155 | |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 3156 | s->crypt_method_header = fmt; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3157 | |
Daniel P. Berrange | 1cd9a78 | 2017-06-23 17:24:17 +0100 | [diff] [blame] | 3158 | crypto = qcrypto_block_create(cryptoopts, "encrypt.", |
Daniel P. Berrange | 4652b8f | 2017-06-23 17:24:12 +0100 | [diff] [blame] | 3159 | qcow2_crypto_hdr_init_func, |
| 3160 | qcow2_crypto_hdr_write_func, |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3161 | bs, errp); |
| 3162 | if (!crypto) { |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3163 | return -EINVAL; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3164 | } |
| 3165 | |
| 3166 | ret = qcow2_update_header(bs); |
| 3167 | if (ret < 0) { |
| 3168 | error_setg_errno(errp, -ret, "Could not write encryption header"); |
| 3169 | goto out; |
| 3170 | } |
| 3171 | |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3172 | ret = 0; |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3173 | out: |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3174 | qcrypto_block_free(crypto); |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3175 | return ret; |
| 3176 | } |
| 3177 | |
Max Reitz | 7bc45dc | 2017-06-13 22:21:00 +0200 | [diff] [blame] | 3178 | /** |
| 3179 | * Preallocates metadata structures for data clusters between @offset (in the |
| 3180 | * guest disk) and @new_length (which is thus generally the new guest disk |
| 3181 | * size). |
| 3182 | * |
| 3183 | * Returns: 0 on success, -errno on failure. |
| 3184 | */ |
Kevin Wolf | 47e86b8 | 2018-06-26 15:52:13 +0200 | [diff] [blame] | 3185 | static int coroutine_fn preallocate_co(BlockDriverState *bs, uint64_t offset, |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 3186 | uint64_t new_length, PreallocMode mode, |
| 3187 | Error **errp) |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3188 | { |
Kevin Wolf | 93e32b3 | 2019-04-15 17:54:50 +0200 | [diff] [blame] | 3189 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 3190 | uint64_t bytes; |
Kevin Wolf | 060bee8 | 2012-12-07 18:08:45 +0100 | [diff] [blame] | 3191 | uint64_t host_offset = 0; |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 3192 | int64_t file_length; |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 3193 | unsigned int cur_bytes; |
Kevin Wolf | 148da7e | 2010-01-20 15:03:01 +0100 | [diff] [blame] | 3194 | int ret; |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3195 | QCowL2Meta *meta = NULL, *m; |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3196 | |
Max Reitz | 7bc45dc | 2017-06-13 22:21:00 +0200 | [diff] [blame] | 3197 | assert(offset <= new_length); |
| 3198 | bytes = new_length - offset; |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3199 | |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 3200 | while (bytes) { |
Kevin Wolf | f29fbf7 | 2019-04-15 16:25:01 +0200 | [diff] [blame] | 3201 | cur_bytes = MIN(bytes, QEMU_ALIGN_DOWN(INT_MAX, s->cluster_size)); |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 3202 | ret = qcow2_alloc_host_offset(bs, offset, &cur_bytes, |
| 3203 | &host_offset, &meta); |
Kevin Wolf | 148da7e | 2010-01-20 15:03:01 +0100 | [diff] [blame] | 3204 | if (ret < 0) { |
Kevin Wolf | 360bd07 | 2019-04-15 16:56:07 +0200 | [diff] [blame] | 3205 | error_setg_errno(errp, -ret, "Allocating clusters failed"); |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3206 | goto out; |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3207 | } |
| 3208 | |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3209 | for (m = meta; m != NULL; m = m->next) { |
| 3210 | m->prealloc = true; |
| 3211 | } |
Stefan Hajnoczi | c792707 | 2014-04-01 11:12:57 +0200 | [diff] [blame] | 3212 | |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3213 | ret = qcow2_handle_l2meta(bs, &meta, true); |
| 3214 | if (ret < 0) { |
| 3215 | error_setg_errno(errp, -ret, "Mapping clusters failed"); |
| 3216 | goto out; |
Kevin Wolf | f50f88b | 2012-12-07 18:08:46 +0100 | [diff] [blame] | 3217 | } |
Kevin Wolf | f214978 | 2009-08-31 16:48:49 +0200 | [diff] [blame] | 3218 | |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3219 | /* TODO Preallocate data if requested */ |
| 3220 | |
Kevin Wolf | d46a0bb | 2016-06-01 16:55:05 +0200 | [diff] [blame] | 3221 | bytes -= cur_bytes; |
| 3222 | offset += cur_bytes; |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3223 | } |
| 3224 | |
| 3225 | /* |
| 3226 | * It is expected that the image file is large enough to actually contain |
| 3227 | * all of the allocated clusters (otherwise we get failing reads after |
| 3228 | * EOF). Extend the image to the last allocated sector. |
| 3229 | */ |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 3230 | file_length = bdrv_getlength(s->data_file->bs); |
| 3231 | if (file_length < 0) { |
| 3232 | error_setg_errno(errp, -file_length, "Could not get file size"); |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3233 | ret = file_length; |
| 3234 | goto out; |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 3235 | } |
| 3236 | |
| 3237 | if (host_offset + cur_bytes > file_length) { |
| 3238 | if (mode == PREALLOC_MODE_METADATA) { |
| 3239 | mode = PREALLOC_MODE_OFF; |
| 3240 | } |
Max Reitz | c80d8b0 | 2019-09-18 11:51:40 +0200 | [diff] [blame] | 3241 | ret = bdrv_co_truncate(s->data_file, host_offset + cur_bytes, false, |
Kevin Wolf | 7b8e485 | 2020-04-24 14:54:40 +0200 | [diff] [blame] | 3242 | mode, 0, errp); |
Kevin Wolf | 19dbcbf | 2010-06-22 16:59:46 +0200 | [diff] [blame] | 3243 | if (ret < 0) { |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3244 | goto out; |
Kevin Wolf | 19dbcbf | 2010-06-22 16:59:46 +0200 | [diff] [blame] | 3245 | } |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3246 | } |
| 3247 | |
Alberto Garcia | 1a52b73 | 2020-09-08 16:08:27 +0200 | [diff] [blame] | 3248 | ret = 0; |
| 3249 | |
| 3250 | out: |
| 3251 | qcow2_handle_l2meta(bs, &meta, false); |
| 3252 | return ret; |
Kevin Wolf | a35e1c1 | 2009-08-17 15:50:10 +0200 | [diff] [blame] | 3253 | } |
| 3254 | |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3255 | /* qcow2_refcount_metadata_size: |
| 3256 | * @clusters: number of clusters to refcount (including data and L1/L2 tables) |
| 3257 | * @cluster_size: size of a cluster, in bytes |
| 3258 | * @refcount_order: refcount bits power-of-2 exponent |
Max Reitz | 12cc30a | 2017-06-13 22:21:03 +0200 | [diff] [blame] | 3259 | * @generous_increase: allow for the refcount table to be 1.5x as large as it |
| 3260 | * needs to be |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3261 | * |
| 3262 | * Returns: Number of bytes required for refcount blocks and table metadata. |
| 3263 | */ |
Max Reitz | 12cc30a | 2017-06-13 22:21:03 +0200 | [diff] [blame] | 3264 | int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size, |
| 3265 | int refcount_order, bool generous_increase, |
| 3266 | uint64_t *refblock_count) |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3267 | { |
| 3268 | /* |
| 3269 | * Every host cluster is reference-counted, including metadata (even |
| 3270 | * refcount metadata is recursively included). |
| 3271 | * |
| 3272 | * An accurate formula for the size of refcount metadata size is difficult |
| 3273 | * to derive. An easier method of calculation is finding the fixed point |
| 3274 | * where no further refcount blocks or table clusters are required to |
| 3275 | * reference count every cluster. |
| 3276 | */ |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 3277 | int64_t blocks_per_table_cluster = cluster_size / REFTABLE_ENTRY_SIZE; |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3278 | int64_t refcounts_per_block = cluster_size * 8 / (1 << refcount_order); |
| 3279 | int64_t table = 0; /* number of refcount table clusters */ |
| 3280 | int64_t blocks = 0; /* number of refcount block clusters */ |
| 3281 | int64_t last; |
| 3282 | int64_t n = 0; |
| 3283 | |
| 3284 | do { |
| 3285 | last = n; |
| 3286 | blocks = DIV_ROUND_UP(clusters + table + blocks, refcounts_per_block); |
| 3287 | table = DIV_ROUND_UP(blocks, blocks_per_table_cluster); |
| 3288 | n = clusters + blocks + table; |
Max Reitz | 12cc30a | 2017-06-13 22:21:03 +0200 | [diff] [blame] | 3289 | |
| 3290 | if (n == last && generous_increase) { |
| 3291 | clusters += DIV_ROUND_UP(table, 2); |
| 3292 | n = 0; /* force another loop */ |
| 3293 | generous_increase = false; |
| 3294 | } |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3295 | } while (n != last); |
| 3296 | |
Max Reitz | 12cc30a | 2017-06-13 22:21:03 +0200 | [diff] [blame] | 3297 | if (refblock_count) { |
| 3298 | *refblock_count = blocks; |
| 3299 | } |
| 3300 | |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3301 | return (blocks + table) * cluster_size; |
| 3302 | } |
| 3303 | |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3304 | /** |
| 3305 | * qcow2_calc_prealloc_size: |
| 3306 | * @total_size: virtual disk size in bytes |
| 3307 | * @cluster_size: cluster size in bytes |
| 3308 | * @refcount_order: refcount bits power-of-2 exponent |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 3309 | * @extended_l2: true if the image has extended L2 entries |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3310 | * |
| 3311 | * Returns: Total number of bytes required for the fully allocated image |
| 3312 | * (including metadata). |
| 3313 | */ |
| 3314 | static int64_t qcow2_calc_prealloc_size(int64_t total_size, |
| 3315 | size_t cluster_size, |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 3316 | int refcount_order, |
| 3317 | bool extended_l2) |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3318 | { |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3319 | int64_t meta_size = 0; |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3320 | uint64_t nl1e, nl2e; |
Alberto Garcia | 9e02968 | 2018-02-15 15:10:08 +0200 | [diff] [blame] | 3321 | int64_t aligned_total_size = ROUND_UP(total_size, cluster_size); |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 3322 | size_t l2e_size = extended_l2 ? L2E_SIZE_EXTENDED : L2E_SIZE_NORMAL; |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3323 | |
| 3324 | /* header: 1 cluster */ |
| 3325 | meta_size += cluster_size; |
| 3326 | |
| 3327 | /* total size of L2 tables */ |
| 3328 | nl2e = aligned_total_size / cluster_size; |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 3329 | nl2e = ROUND_UP(nl2e, cluster_size / l2e_size); |
| 3330 | meta_size += nl2e * l2e_size; |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3331 | |
| 3332 | /* total size of L1 tables */ |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 3333 | nl1e = nl2e * l2e_size / cluster_size; |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 3334 | nl1e = ROUND_UP(nl1e, cluster_size / L1E_SIZE); |
| 3335 | meta_size += nl1e * L1E_SIZE; |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3336 | |
Stefan Hajnoczi | 7c5bcc4 | 2017-07-05 13:57:33 +0100 | [diff] [blame] | 3337 | /* total size of refcount table and blocks */ |
| 3338 | meta_size += qcow2_refcount_metadata_size( |
| 3339 | (meta_size + aligned_total_size) / cluster_size, |
Max Reitz | 12cc30a | 2017-06-13 22:21:03 +0200 | [diff] [blame] | 3340 | cluster_size, refcount_order, false, NULL); |
Stefan Hajnoczi | 95c67e3 | 2017-07-05 13:57:32 +0100 | [diff] [blame] | 3341 | |
| 3342 | return meta_size + aligned_total_size; |
| 3343 | } |
| 3344 | |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3345 | static bool validate_cluster_size(size_t cluster_size, bool extended_l2, |
| 3346 | Error **errp) |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3347 | { |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3348 | int cluster_bits = ctz32(cluster_size); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3349 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || |
| 3350 | (1 << cluster_bits) != cluster_size) |
| 3351 | { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3352 | error_setg(errp, "Cluster size must be a power of two between %d and " |
| 3353 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3354 | return false; |
| 3355 | } |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3356 | |
| 3357 | if (extended_l2) { |
| 3358 | unsigned min_cluster_size = |
| 3359 | (1 << MIN_CLUSTER_BITS) * QCOW_EXTL2_SUBCLUSTERS_PER_CLUSTER; |
| 3360 | if (cluster_size < min_cluster_size) { |
| 3361 | error_setg(errp, "Extended L2 entries are only supported with " |
| 3362 | "cluster sizes of at least %u bytes", min_cluster_size); |
| 3363 | return false; |
| 3364 | } |
| 3365 | } |
| 3366 | |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3367 | return true; |
| 3368 | } |
| 3369 | |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3370 | static size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, bool extended_l2, |
| 3371 | Error **errp) |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3372 | { |
| 3373 | size_t cluster_size; |
| 3374 | |
| 3375 | cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, |
| 3376 | DEFAULT_CLUSTER_SIZE); |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3377 | if (!validate_cluster_size(cluster_size, extended_l2, errp)) { |
Stefan Hajnoczi | 0eb4a8c | 2017-07-05 13:57:34 +0100 | [diff] [blame] | 3378 | return 0; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3379 | } |
Stefan Hajnoczi | 0eb4a8c | 2017-07-05 13:57:34 +0100 | [diff] [blame] | 3380 | return cluster_size; |
| 3381 | } |
| 3382 | |
| 3383 | static int qcow2_opt_get_version_del(QemuOpts *opts, Error **errp) |
| 3384 | { |
| 3385 | char *buf; |
| 3386 | int ret; |
| 3387 | |
| 3388 | buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL); |
| 3389 | if (!buf) { |
| 3390 | ret = 3; /* default */ |
| 3391 | } else if (!strcmp(buf, "0.10")) { |
| 3392 | ret = 2; |
| 3393 | } else if (!strcmp(buf, "1.1")) { |
| 3394 | ret = 3; |
| 3395 | } else { |
| 3396 | error_setg(errp, "Invalid compatibility level: '%s'", buf); |
| 3397 | ret = -EINVAL; |
| 3398 | } |
| 3399 | g_free(buf); |
| 3400 | return ret; |
| 3401 | } |
| 3402 | |
| 3403 | static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version, |
| 3404 | Error **errp) |
| 3405 | { |
| 3406 | uint64_t refcount_bits; |
| 3407 | |
| 3408 | refcount_bits = qemu_opt_get_number_del(opts, BLOCK_OPT_REFCOUNT_BITS, 16); |
| 3409 | if (refcount_bits > 64 || !is_power_of_2(refcount_bits)) { |
| 3410 | error_setg(errp, "Refcount width must be a power of two and may not " |
| 3411 | "exceed 64 bits"); |
| 3412 | return 0; |
| 3413 | } |
| 3414 | |
| 3415 | if (version < 3 && refcount_bits != 16) { |
| 3416 | error_setg(errp, "Different refcount widths than 16 bits require " |
| 3417 | "compatibility level 1.1 or above (use compat=1.1 or " |
| 3418 | "greater)"); |
| 3419 | return 0; |
| 3420 | } |
| 3421 | |
| 3422 | return refcount_bits; |
| 3423 | } |
| 3424 | |
Stefan Hajnoczi | c274393 | 2018-01-18 13:43:46 +0100 | [diff] [blame] | 3425 | static int coroutine_fn |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3426 | qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp) |
Stefan Hajnoczi | 0eb4a8c | 2017-07-05 13:57:34 +0100 | [diff] [blame] | 3427 | { |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3428 | BlockdevCreateOptionsQcow2 *qcow2_opts; |
Stefan Hajnoczi | 0eb4a8c | 2017-07-05 13:57:34 +0100 | [diff] [blame] | 3429 | QDict *options; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3430 | |
| 3431 | /* |
| 3432 | * Open the image file and write a minimal qcow2 header. |
| 3433 | * |
| 3434 | * We keep things simple and start with a zero-sized image. We also |
| 3435 | * do without refcount blocks or a L1 table for now. We'll fix the |
| 3436 | * inconsistency later. |
| 3437 | * |
| 3438 | * We do need a refcount table because growing the refcount table means |
Eric Blake | a951a63 | 2020-03-24 12:42:30 -0500 | [diff] [blame] | 3439 | * allocating two new refcount blocks - the second of which would be at |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3440 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file |
| 3441 | * size for any qcow2 image. |
| 3442 | */ |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3443 | BlockBackend *blk = NULL; |
| 3444 | BlockDriverState *bs = NULL; |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3445 | BlockDriverState *data_bs = NULL; |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3446 | QCowHeader *header; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3447 | size_t cluster_size; |
| 3448 | int version; |
| 3449 | int refcount_order; |
shiliyang | 5f14f31 | 2020-10-30 11:35:12 +0800 | [diff] [blame] | 3450 | uint64_t *refcount_table; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3451 | int ret; |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3452 | uint8_t compression_type = QCOW2_COMPRESSION_TYPE_ZLIB; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3453 | |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3454 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2); |
| 3455 | qcow2_opts = &create_options->u.qcow2; |
| 3456 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3457 | bs = bdrv_open_blockdev_ref(qcow2_opts->file, errp); |
| 3458 | if (bs == NULL) { |
| 3459 | return -EIO; |
| 3460 | } |
| 3461 | |
| 3462 | /* Validate options and set default values */ |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3463 | if (!QEMU_IS_ALIGNED(qcow2_opts->size, BDRV_SECTOR_SIZE)) { |
Alberto Garcia | 3afea40 | 2020-01-18 20:09:30 +0100 | [diff] [blame] | 3464 | error_setg(errp, "Image size must be a multiple of %u bytes", |
| 3465 | (unsigned) BDRV_SECTOR_SIZE); |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3466 | ret = -EINVAL; |
| 3467 | goto out; |
| 3468 | } |
| 3469 | |
| 3470 | if (qcow2_opts->has_version) { |
| 3471 | switch (qcow2_opts->version) { |
| 3472 | case BLOCKDEV_QCOW2_VERSION_V2: |
| 3473 | version = 2; |
| 3474 | break; |
| 3475 | case BLOCKDEV_QCOW2_VERSION_V3: |
| 3476 | version = 3; |
| 3477 | break; |
| 3478 | default: |
| 3479 | g_assert_not_reached(); |
| 3480 | } |
| 3481 | } else { |
| 3482 | version = 3; |
| 3483 | } |
| 3484 | |
| 3485 | if (qcow2_opts->has_cluster_size) { |
| 3486 | cluster_size = qcow2_opts->cluster_size; |
| 3487 | } else { |
| 3488 | cluster_size = DEFAULT_CLUSTER_SIZE; |
| 3489 | } |
| 3490 | |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3491 | if (!qcow2_opts->has_extended_l2) { |
| 3492 | qcow2_opts->extended_l2 = false; |
| 3493 | } |
| 3494 | if (qcow2_opts->extended_l2) { |
| 3495 | if (version < 3) { |
| 3496 | error_setg(errp, "Extended L2 entries are only supported with " |
| 3497 | "compatibility level 1.1 and above (use version=v3 or " |
| 3498 | "greater)"); |
| 3499 | ret = -EINVAL; |
| 3500 | goto out; |
| 3501 | } |
| 3502 | } |
| 3503 | |
| 3504 | if (!validate_cluster_size(cluster_size, qcow2_opts->extended_l2, errp)) { |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3505 | ret = -EINVAL; |
| 3506 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3507 | } |
| 3508 | |
| 3509 | if (!qcow2_opts->has_preallocation) { |
| 3510 | qcow2_opts->preallocation = PREALLOC_MODE_OFF; |
| 3511 | } |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3512 | if (qcow2_opts->backing_file && |
Alberto Garcia | 2118771 | 2020-07-10 18:13:14 +0200 | [diff] [blame] | 3513 | qcow2_opts->preallocation != PREALLOC_MODE_OFF && |
| 3514 | !qcow2_opts->extended_l2) |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3515 | { |
Alberto Garcia | 2118771 | 2020-07-10 18:13:14 +0200 | [diff] [blame] | 3516 | error_setg(errp, "Backing file and preallocation can only be used at " |
| 3517 | "the same time if extended_l2 is on"); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3518 | ret = -EINVAL; |
| 3519 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3520 | } |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3521 | if (qcow2_opts->has_backing_fmt && !qcow2_opts->backing_file) { |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3522 | error_setg(errp, "Backing format cannot be used without backing file"); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3523 | ret = -EINVAL; |
| 3524 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3525 | } |
| 3526 | |
| 3527 | if (!qcow2_opts->has_lazy_refcounts) { |
| 3528 | qcow2_opts->lazy_refcounts = false; |
| 3529 | } |
| 3530 | if (version < 3 && qcow2_opts->lazy_refcounts) { |
| 3531 | error_setg(errp, "Lazy refcounts only supported with compatibility " |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3532 | "level 1.1 and above (use version=v3 or greater)"); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3533 | ret = -EINVAL; |
| 3534 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3535 | } |
| 3536 | |
| 3537 | if (!qcow2_opts->has_refcount_bits) { |
| 3538 | qcow2_opts->refcount_bits = 16; |
| 3539 | } |
| 3540 | if (qcow2_opts->refcount_bits > 64 || |
| 3541 | !is_power_of_2(qcow2_opts->refcount_bits)) |
| 3542 | { |
| 3543 | error_setg(errp, "Refcount width must be a power of two and may not " |
| 3544 | "exceed 64 bits"); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3545 | ret = -EINVAL; |
| 3546 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3547 | } |
| 3548 | if (version < 3 && qcow2_opts->refcount_bits != 16) { |
| 3549 | error_setg(errp, "Different refcount widths than 16 bits require " |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3550 | "compatibility level 1.1 or above (use version=v3 or " |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3551 | "greater)"); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3552 | ret = -EINVAL; |
| 3553 | goto out; |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3554 | } |
| 3555 | refcount_order = ctz32(qcow2_opts->refcount_bits); |
| 3556 | |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3557 | if (qcow2_opts->data_file_raw && !qcow2_opts->data_file) { |
| 3558 | error_setg(errp, "data-file-raw requires data-file"); |
| 3559 | ret = -EINVAL; |
| 3560 | goto out; |
| 3561 | } |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3562 | if (qcow2_opts->data_file_raw && qcow2_opts->backing_file) { |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3563 | error_setg(errp, "Backing file and data-file-raw cannot be used at " |
| 3564 | "the same time"); |
| 3565 | ret = -EINVAL; |
| 3566 | goto out; |
| 3567 | } |
Max Reitz | 4841082 | 2021-03-26 15:55:08 +0100 | [diff] [blame] | 3568 | if (qcow2_opts->data_file_raw && |
| 3569 | qcow2_opts->preallocation == PREALLOC_MODE_OFF) |
| 3570 | { |
| 3571 | /* |
| 3572 | * data-file-raw means that "the external data file can be |
| 3573 | * read as a consistent standalone raw image without looking |
| 3574 | * at the qcow2 metadata." It does not say that the metadata |
| 3575 | * must be ignored, though (and the qcow2 driver in fact does |
| 3576 | * not ignore it), so the L1/L2 tables must be present and |
| 3577 | * give a 1:1 mapping, so you get the same result regardless |
| 3578 | * of whether you look at the metadata or whether you ignore |
| 3579 | * it. |
| 3580 | */ |
| 3581 | qcow2_opts->preallocation = PREALLOC_MODE_METADATA; |
| 3582 | |
| 3583 | /* |
| 3584 | * Cannot use preallocation with backing files, but giving a |
| 3585 | * backing file when specifying data_file_raw is an error |
| 3586 | * anyway. |
| 3587 | */ |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3588 | assert(!qcow2_opts->backing_file); |
Max Reitz | 4841082 | 2021-03-26 15:55:08 +0100 | [diff] [blame] | 3589 | } |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3590 | |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3591 | if (qcow2_opts->data_file) { |
| 3592 | if (version < 3) { |
| 3593 | error_setg(errp, "External data files are only supported with " |
| 3594 | "compatibility level 1.1 and above (use version=v3 or " |
| 3595 | "greater)"); |
| 3596 | ret = -EINVAL; |
| 3597 | goto out; |
| 3598 | } |
| 3599 | data_bs = bdrv_open_blockdev_ref(qcow2_opts->data_file, errp); |
Kevin Wolf | a0cf836 | 2019-03-13 15:22:38 +0100 | [diff] [blame] | 3600 | if (data_bs == NULL) { |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3601 | ret = -EIO; |
| 3602 | goto out; |
| 3603 | } |
| 3604 | } |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3605 | |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3606 | if (qcow2_opts->has_compression_type && |
| 3607 | qcow2_opts->compression_type != QCOW2_COMPRESSION_TYPE_ZLIB) { |
| 3608 | |
| 3609 | ret = -EINVAL; |
| 3610 | |
| 3611 | if (version < 3) { |
| 3612 | error_setg(errp, "Non-zlib compression type is only supported with " |
| 3613 | "compatibility level 1.1 and above (use version=v3 or " |
| 3614 | "greater)"); |
| 3615 | goto out; |
| 3616 | } |
| 3617 | |
| 3618 | switch (qcow2_opts->compression_type) { |
Denis Plotnikov | d298ac1 | 2020-05-07 11:25:20 +0300 | [diff] [blame] | 3619 | #ifdef CONFIG_ZSTD |
| 3620 | case QCOW2_COMPRESSION_TYPE_ZSTD: |
| 3621 | break; |
| 3622 | #endif |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3623 | default: |
| 3624 | error_setg(errp, "Unknown compression type"); |
| 3625 | goto out; |
| 3626 | } |
| 3627 | |
| 3628 | compression_type = qcow2_opts->compression_type; |
| 3629 | } |
| 3630 | |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3631 | /* Create BlockBackend to write to the image */ |
Eric Blake | a3aeeab | 2020-04-28 14:26:46 -0500 | [diff] [blame] | 3632 | blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, |
| 3633 | errp); |
| 3634 | if (!blk) { |
| 3635 | ret = -EPERM; |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3636 | goto out; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3637 | } |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3638 | blk_set_allow_write_beyond_eof(blk, true); |
| 3639 | |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3640 | /* Write the header */ |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3641 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
| 3642 | header = g_malloc0(cluster_size); |
| 3643 | *header = (QCowHeader) { |
| 3644 | .magic = cpu_to_be32(QCOW_MAGIC), |
| 3645 | .version = cpu_to_be32(version), |
Stefan Hajnoczi | 0eb4a8c | 2017-07-05 13:57:34 +0100 | [diff] [blame] | 3646 | .cluster_bits = cpu_to_be32(ctz32(cluster_size)), |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3647 | .size = cpu_to_be64(0), |
| 3648 | .l1_table_offset = cpu_to_be64(0), |
| 3649 | .l1_size = cpu_to_be32(0), |
| 3650 | .refcount_table_offset = cpu_to_be64(cluster_size), |
| 3651 | .refcount_table_clusters = cpu_to_be32(1), |
Max Reitz | bd4b167 | 2015-02-18 17:40:46 -0500 | [diff] [blame] | 3652 | .refcount_order = cpu_to_be32(refcount_order), |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3653 | /* don't deal with endianness since compression_type is 1 byte long */ |
| 3654 | .compression_type = compression_type, |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3655 | .header_length = cpu_to_be32(sizeof(*header)), |
| 3656 | }; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3657 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3658 | /* We'll update this to correct value later */ |
| 3659 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3660 | |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3661 | if (qcow2_opts->lazy_refcounts) { |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3662 | header->compatible_features |= |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 3663 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
| 3664 | } |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3665 | if (data_bs) { |
| 3666 | header->incompatible_features |= |
| 3667 | cpu_to_be64(QCOW2_INCOMPAT_DATA_FILE); |
| 3668 | } |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3669 | if (qcow2_opts->data_file_raw) { |
| 3670 | header->autoclear_features |= |
| 3671 | cpu_to_be64(QCOW2_AUTOCLEAR_DATA_FILE_RAW); |
| 3672 | } |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3673 | if (compression_type != QCOW2_COMPRESSION_TYPE_ZLIB) { |
| 3674 | header->incompatible_features |= |
| 3675 | cpu_to_be64(QCOW2_INCOMPAT_COMPRESSION); |
| 3676 | } |
Stefan Hajnoczi | bfe8043 | 2012-07-27 09:05:22 +0100 | [diff] [blame] | 3677 | |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3678 | if (qcow2_opts->extended_l2) { |
| 3679 | header->incompatible_features |= |
| 3680 | cpu_to_be64(QCOW2_INCOMPAT_EXTL2); |
| 3681 | } |
| 3682 | |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 3683 | ret = blk_co_pwrite(blk, 0, cluster_size, header, 0); |
Kevin Wolf | f8413b3 | 2013-12-04 11:06:36 +0100 | [diff] [blame] | 3684 | g_free(header); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3685 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3686 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3687 | goto out; |
| 3688 | } |
| 3689 | |
Kevin Wolf | b106ad9 | 2014-03-28 18:06:31 +0100 | [diff] [blame] | 3690 | /* Write a refcount table with one refcount block */ |
| 3691 | refcount_table = g_malloc0(2 * cluster_size); |
| 3692 | refcount_table[0] = cpu_to_be64(2 * cluster_size); |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 3693 | ret = blk_co_pwrite(blk, cluster_size, 2 * cluster_size, refcount_table, 0); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 3694 | g_free(refcount_table); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3695 | |
| 3696 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3697 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3698 | goto out; |
| 3699 | } |
| 3700 | |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3701 | blk_unref(blk); |
| 3702 | blk = NULL; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3703 | |
| 3704 | /* |
| 3705 | * And now open the image and make it consistent first (i.e. increase the |
| 3706 | * refcount of the cluster that is occupied by the header and the refcount |
| 3707 | * table) |
| 3708 | */ |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 3709 | options = qdict_new(); |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3710 | qdict_put_str(options, "driver", "qcow2"); |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3711 | qdict_put_str(options, "file", bs->node_name); |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3712 | if (data_bs) { |
| 3713 | qdict_put_str(options, "data-file", data_bs->node_name); |
| 3714 | } |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3715 | blk = blk_new_open(NULL, NULL, options, |
Kevin Wolf | 5588060 | 2017-02-17 15:07:38 +0100 | [diff] [blame] | 3716 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH, |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 3717 | errp); |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3718 | if (blk == NULL) { |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3719 | ret = -EIO; |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3720 | goto out; |
| 3721 | } |
| 3722 | |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3723 | ret = qcow2_alloc_clusters(blk_bs(blk), 3 * cluster_size); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3724 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3725 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
| 3726 | "header and refcount table"); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3727 | goto out; |
| 3728 | |
| 3729 | } else if (ret != 0) { |
| 3730 | error_report("Huh, first cluster in empty image is already in use?"); |
| 3731 | abort(); |
| 3732 | } |
| 3733 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 3734 | /* Set the external data file if necessary */ |
| 3735 | if (data_bs) { |
| 3736 | BDRVQcow2State *s = blk_bs(blk)->opaque; |
| 3737 | s->image_data_file = g_strdup(data_bs->filename); |
| 3738 | } |
| 3739 | |
Kevin Wolf | b527c9b | 2015-12-02 18:34:39 +0100 | [diff] [blame] | 3740 | /* Create a full header (including things like feature table) */ |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3741 | ret = qcow2_update_header(blk_bs(blk)); |
Kevin Wolf | b527c9b | 2015-12-02 18:34:39 +0100 | [diff] [blame] | 3742 | if (ret < 0) { |
| 3743 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
| 3744 | goto out; |
| 3745 | } |
| 3746 | |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3747 | /* Okay, now that we have a valid image, let's give it the right size */ |
Alberto Faria | 38505e2 | 2022-10-13 14:37:06 +0200 | [diff] [blame] | 3748 | ret = blk_co_truncate(blk, qcow2_opts->size, false, |
| 3749 | qcow2_opts->preallocation, 0, errp); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3750 | if (ret < 0) { |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3751 | error_prepend(errp, "Could not resize image: "); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3752 | goto out; |
| 3753 | } |
| 3754 | |
Eric Blake | a951a63 | 2020-03-24 12:42:30 -0500 | [diff] [blame] | 3755 | /* Want a backing file? There you go. */ |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3756 | if (qcow2_opts->backing_file) { |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3757 | const char *backing_format = NULL; |
| 3758 | |
| 3759 | if (qcow2_opts->has_backing_fmt) { |
| 3760 | backing_format = BlockdevDriver_str(qcow2_opts->backing_fmt); |
| 3761 | } |
| 3762 | |
| 3763 | ret = bdrv_change_backing_file(blk_bs(blk), qcow2_opts->backing_file, |
Eric Blake | e54ee1b | 2020-07-06 15:39:53 -0500 | [diff] [blame] | 3764 | backing_format, false); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3765 | if (ret < 0) { |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3766 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3767 | "with format '%s'", qcow2_opts->backing_file, |
| 3768 | backing_format); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3769 | goto out; |
| 3770 | } |
| 3771 | } |
| 3772 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3773 | /* Want encryption? There you go. */ |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 3774 | if (qcow2_opts->encrypt) { |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3775 | ret = qcow2_set_up_encryption(blk_bs(blk), qcow2_opts->encrypt, errp); |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3776 | if (ret < 0) { |
| 3777 | goto out; |
| 3778 | } |
| 3779 | } |
| 3780 | |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3781 | blk_unref(blk); |
| 3782 | blk = NULL; |
Max Reitz | ba2ab2f | 2013-10-24 20:35:06 +0200 | [diff] [blame] | 3783 | |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3784 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning. |
| 3785 | * Using BDRV_O_NO_IO, since encryption is now setup we don't want to |
| 3786 | * have to setup decryption context. We're not doing any I/O on the top |
| 3787 | * level BlockDriverState, only lower layers, where BDRV_O_NO_IO does |
| 3788 | * not have effect. |
| 3789 | */ |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 3790 | options = qdict_new(); |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3791 | qdict_put_str(options, "driver", "qcow2"); |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3792 | qdict_put_str(options, "file", bs->node_name); |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3793 | if (data_bs) { |
| 3794 | qdict_put_str(options, "data-file", data_bs->node_name); |
| 3795 | } |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3796 | blk = blk_new_open(NULL, NULL, options, |
Daniel P. Berrange | b25b387 | 2017-06-23 17:24:10 +0100 | [diff] [blame] | 3797 | BDRV_O_RDWR | BDRV_O_NO_BACKING | BDRV_O_NO_IO, |
Markus Armbruster | af175e8 | 2020-07-07 18:06:03 +0200 | [diff] [blame] | 3798 | errp); |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3799 | if (blk == NULL) { |
Kevin Wolf | 2358879 | 2016-03-08 15:57:05 +0100 | [diff] [blame] | 3800 | ret = -EIO; |
Max Reitz | ba2ab2f | 2013-10-24 20:35:06 +0200 | [diff] [blame] | 3801 | goto out; |
| 3802 | } |
| 3803 | |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3804 | ret = 0; |
| 3805 | out: |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 3806 | blk_unref(blk); |
| 3807 | bdrv_unref(bs); |
Kevin Wolf | dcc9868 | 2019-01-14 16:57:27 +0100 | [diff] [blame] | 3808 | bdrv_unref(data_bs); |
Kevin Wolf | a942073 | 2010-06-11 21:37:37 +0200 | [diff] [blame] | 3809 | return ret; |
| 3810 | } |
Kevin Wolf | de5f3f4 | 2010-05-07 12:43:45 +0200 | [diff] [blame] | 3811 | |
Maxim Levitsky | b92902d | 2020-03-26 03:12:17 +0200 | [diff] [blame] | 3812 | static int coroutine_fn qcow2_co_create_opts(BlockDriver *drv, |
| 3813 | const char *filename, |
| 3814 | QemuOpts *opts, |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 3815 | Error **errp) |
Kevin Wolf | de5f3f4 | 2010-05-07 12:43:45 +0200 | [diff] [blame] | 3816 | { |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3817 | BlockdevCreateOptions *create_options = NULL; |
Markus Armbruster | 92adf9d | 2018-06-14 21:14:32 +0200 | [diff] [blame] | 3818 | QDict *qdict; |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3819 | Visitor *v; |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3820 | BlockDriverState *bs = NULL; |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 3821 | BlockDriverState *data_bs = NULL; |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3822 | const char *val; |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3823 | int ret; |
Kevin Wolf | de5f3f4 | 2010-05-07 12:43:45 +0200 | [diff] [blame] | 3824 | |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3825 | /* Only the keyval visitor supports the dotted syntax needed for |
| 3826 | * encryption, so go through a QDict before getting a QAPI type. Ignore |
| 3827 | * options meant for the protocol layer so that the visitor doesn't |
| 3828 | * complain. */ |
| 3829 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, bdrv_qcow2.create_opts, |
| 3830 | true); |
| 3831 | |
| 3832 | /* Handle encryption options */ |
| 3833 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); |
| 3834 | if (val && !strcmp(val, "on")) { |
| 3835 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); |
| 3836 | } else if (val && !strcmp(val, "off")) { |
| 3837 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); |
| 3838 | } |
| 3839 | |
| 3840 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); |
| 3841 | if (val && !strcmp(val, "aes")) { |
| 3842 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); |
| 3843 | } |
| 3844 | |
| 3845 | /* Convert compat=0.10/1.1 into compat=v2/v3, to be renamed into |
| 3846 | * version=v2/v3 below. */ |
| 3847 | val = qdict_get_try_str(qdict, BLOCK_OPT_COMPAT_LEVEL); |
| 3848 | if (val && !strcmp(val, "0.10")) { |
| 3849 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v2"); |
| 3850 | } else if (val && !strcmp(val, "1.1")) { |
| 3851 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v3"); |
| 3852 | } |
| 3853 | |
| 3854 | /* Change legacy command line options into QMP ones */ |
| 3855 | static const QDictRenames opt_renames[] = { |
| 3856 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, |
| 3857 | { BLOCK_OPT_BACKING_FMT, "backing-fmt" }, |
| 3858 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, |
| 3859 | { BLOCK_OPT_LAZY_REFCOUNTS, "lazy-refcounts" }, |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 3860 | { BLOCK_OPT_EXTL2, "extended-l2" }, |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3861 | { BLOCK_OPT_REFCOUNT_BITS, "refcount-bits" }, |
| 3862 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, |
| 3863 | { BLOCK_OPT_COMPAT_LEVEL, "version" }, |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 3864 | { BLOCK_OPT_DATA_FILE_RAW, "data-file-raw" }, |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 3865 | { BLOCK_OPT_COMPRESSION_TYPE, "compression-type" }, |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3866 | { NULL, NULL }, |
| 3867 | }; |
| 3868 | |
| 3869 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { |
Kevin Wolf | 29ca9e4 | 2018-01-09 19:44:33 +0100 | [diff] [blame] | 3870 | ret = -EINVAL; |
| 3871 | goto finish; |
| 3872 | } |
Kevin Wolf | 60900b7 | 2018-01-10 17:55:16 +0100 | [diff] [blame] | 3873 | |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3874 | /* Create and open the file (protocol layer) */ |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 3875 | ret = bdrv_co_create_file(filename, opts, errp); |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3876 | if (ret < 0) { |
| 3877 | goto finish; |
| 3878 | } |
| 3879 | |
| 3880 | bs = bdrv_open(filename, NULL, NULL, |
| 3881 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); |
| 3882 | if (bs == NULL) { |
| 3883 | ret = -EIO; |
| 3884 | goto finish; |
| 3885 | } |
| 3886 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 3887 | /* Create and open an external data file (protocol layer) */ |
| 3888 | val = qdict_get_try_str(qdict, BLOCK_OPT_DATA_FILE); |
| 3889 | if (val) { |
Emanuele Giuseppe Esposito | 2475a0d | 2022-11-28 09:23:31 -0500 | [diff] [blame] | 3890 | ret = bdrv_co_create_file(val, opts, errp); |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 3891 | if (ret < 0) { |
| 3892 | goto finish; |
| 3893 | } |
| 3894 | |
| 3895 | data_bs = bdrv_open(val, NULL, NULL, |
| 3896 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, |
| 3897 | errp); |
| 3898 | if (data_bs == NULL) { |
| 3899 | ret = -EIO; |
| 3900 | goto finish; |
| 3901 | } |
| 3902 | |
| 3903 | qdict_del(qdict, BLOCK_OPT_DATA_FILE); |
| 3904 | qdict_put_str(qdict, "data-file", data_bs->node_name); |
| 3905 | } |
| 3906 | |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3907 | /* Set 'driver' and 'node' options */ |
| 3908 | qdict_put_str(qdict, "driver", "qcow2"); |
| 3909 | qdict_put_str(qdict, "file", bs->node_name); |
| 3910 | |
| 3911 | /* Now get the QAPI type BlockdevCreateOptions */ |
Markus Armbruster | af91062 | 2018-06-14 21:14:33 +0200 | [diff] [blame] | 3912 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
| 3913 | if (!v) { |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3914 | ret = -EINVAL; |
| 3915 | goto finish; |
| 3916 | } |
| 3917 | |
Markus Armbruster | b11a093 | 2020-07-07 18:06:07 +0200 | [diff] [blame] | 3918 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3919 | visit_free(v); |
Markus Armbruster | b11a093 | 2020-07-07 18:06:07 +0200 | [diff] [blame] | 3920 | if (!create_options) { |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3921 | ret = -EINVAL; |
| 3922 | goto finish; |
| 3923 | } |
| 3924 | |
| 3925 | /* Silently round up size */ |
| 3926 | create_options->u.qcow2.size = ROUND_UP(create_options->u.qcow2.size, |
| 3927 | BDRV_SECTOR_SIZE); |
| 3928 | |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3929 | /* Create the qcow2 image (format layer) */ |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3930 | ret = qcow2_co_create(create_options, errp); |
Maxim Levitsky | 6094cbe | 2020-12-17 19:09:04 +0200 | [diff] [blame] | 3931 | finish: |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3932 | if (ret < 0) { |
Maxim Levitsky | 6094cbe | 2020-12-17 19:09:04 +0200 | [diff] [blame] | 3933 | bdrv_co_delete_file_noerr(bs); |
| 3934 | bdrv_co_delete_file_noerr(data_bs); |
| 3935 | } else { |
| 3936 | ret = 0; |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3937 | } |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 3938 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3939 | qobject_unref(qdict); |
Kevin Wolf | cbf2b7c | 2018-01-09 17:35:26 +0100 | [diff] [blame] | 3940 | bdrv_unref(bs); |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 3941 | bdrv_unref(data_bs); |
Kevin Wolf | b76b4f6 | 2018-01-11 16:18:08 +0100 | [diff] [blame] | 3942 | qapi_free_BlockdevCreateOptions(create_options); |
Max Reitz | 3ef6c40 | 2013-09-05 09:40:43 +0200 | [diff] [blame] | 3943 | return ret; |
Kevin Wolf | de5f3f4 | 2010-05-07 12:43:45 +0200 | [diff] [blame] | 3944 | } |
| 3945 | |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3946 | |
Eric Blake | f06f6b6 | 2017-10-11 22:47:00 -0500 | [diff] [blame] | 3947 | static bool is_zero(BlockDriverState *bs, int64_t offset, int64_t bytes) |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3948 | { |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 3949 | int64_t nr; |
| 3950 | int res; |
Eric Blake | f06f6b6 | 2017-10-11 22:47:00 -0500 | [diff] [blame] | 3951 | |
| 3952 | /* Clamp to image length, before checking status of underlying sectors */ |
Eric Blake | 8cbf74b | 2017-10-11 22:47:19 -0500 | [diff] [blame] | 3953 | if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { |
| 3954 | bytes = bs->total_sectors * BDRV_SECTOR_SIZE - offset; |
Eric Blake | fbaa6bb | 2017-05-06 19:05:50 -0500 | [diff] [blame] | 3955 | } |
| 3956 | |
Eric Blake | f06f6b6 | 2017-10-11 22:47:00 -0500 | [diff] [blame] | 3957 | if (!bytes) { |
Eric Blake | ebb718a | 2016-05-25 21:48:49 -0600 | [diff] [blame] | 3958 | return true; |
| 3959 | } |
Vladimir Sementsov-Ogievskiy | 67c095c | 2020-09-24 22:39:59 +0300 | [diff] [blame] | 3960 | |
| 3961 | /* |
| 3962 | * bdrv_block_status_above doesn't merge different types of zeros, for |
| 3963 | * example, zeros which come from the region which is unallocated in |
| 3964 | * the whole backing chain, and zeros which come because of a short |
| 3965 | * backing file. So, we need a loop. |
| 3966 | */ |
| 3967 | do { |
| 3968 | res = bdrv_block_status_above(bs, NULL, offset, bytes, &nr, NULL, NULL); |
| 3969 | offset += nr; |
| 3970 | bytes -= nr; |
| 3971 | } while (res >= 0 && (res & BDRV_BLOCK_ZERO) && nr && bytes); |
| 3972 | |
| 3973 | return res >= 0 && (res & BDRV_BLOCK_ZERO) && bytes == 0; |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3974 | } |
| 3975 | |
Eric Blake | 5544b59 | 2016-06-01 15:10:06 -0600 | [diff] [blame] | 3976 | static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | f34b2bc | 2021-09-03 13:28:03 +0300 | [diff] [blame] | 3977 | int64_t offset, int64_t bytes, BdrvRequestFlags flags) |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3978 | { |
| 3979 | int ret; |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 3980 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3981 | |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 3982 | uint32_t head = offset_into_subcluster(s, offset); |
| 3983 | uint32_t tail = ROUND_UP(offset + bytes, s->subcluster_size) - |
| 3984 | (offset + bytes); |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3985 | |
Manos Pitsidianakis | f5a5ca7 | 2017-06-09 13:18:08 +0300 | [diff] [blame] | 3986 | trace_qcow2_pwrite_zeroes_start_req(qemu_coroutine_self(), offset, bytes); |
| 3987 | if (offset + bytes == bs->total_sectors * BDRV_SECTOR_SIZE) { |
Eric Blake | fbaa6bb | 2017-05-06 19:05:50 -0500 | [diff] [blame] | 3988 | tail = 0; |
| 3989 | } |
Denis V. Lunev | 5a64e94 | 2016-05-25 21:48:47 -0600 | [diff] [blame] | 3990 | |
Eric Blake | ebb718a | 2016-05-25 21:48:49 -0600 | [diff] [blame] | 3991 | if (head || tail) { |
Eric Blake | ebb718a | 2016-05-25 21:48:49 -0600 | [diff] [blame] | 3992 | uint64_t off; |
Kevin Wolf | ecfe186 | 2016-05-31 16:13:07 +0200 | [diff] [blame] | 3993 | unsigned int nr; |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 3994 | QCow2SubclusterType type; |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3995 | |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 3996 | assert(head + bytes + tail <= s->subcluster_size); |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 3997 | |
Eric Blake | ebb718a | 2016-05-25 21:48:49 -0600 | [diff] [blame] | 3998 | /* check whether remainder of cluster already reads as zero */ |
Eric Blake | f06f6b6 | 2017-10-11 22:47:00 -0500 | [diff] [blame] | 3999 | if (!(is_zero(bs, offset - head, head) && |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4000 | is_zero(bs, offset + bytes, tail))) { |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 4001 | return -ENOTSUP; |
| 4002 | } |
| 4003 | |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 4004 | qemu_co_mutex_lock(&s->lock); |
| 4005 | /* We can have new write after previous check */ |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4006 | offset -= head; |
| 4007 | bytes = s->subcluster_size; |
| 4008 | nr = s->subcluster_size; |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 4009 | ret = qcow2_get_host_offset(bs, offset, &nr, &off, &type); |
| 4010 | if (ret < 0 || |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4011 | (type != QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN && |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 4012 | type != QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC && |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4013 | type != QCOW2_SUBCLUSTER_ZERO_PLAIN && |
| 4014 | type != QCOW2_SUBCLUSTER_ZERO_ALLOC)) { |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 4015 | qemu_co_mutex_unlock(&s->lock); |
Alberto Garcia | 580384d | 2020-09-09 14:37:39 +0200 | [diff] [blame] | 4016 | return ret < 0 ? ret : -ENOTSUP; |
Denis V. Lunev | 2928abc | 2016-05-11 10:00:14 +0300 | [diff] [blame] | 4017 | } |
| 4018 | } else { |
| 4019 | qemu_co_mutex_lock(&s->lock); |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 4020 | } |
| 4021 | |
Manos Pitsidianakis | f5a5ca7 | 2017-06-09 13:18:08 +0300 | [diff] [blame] | 4022 | trace_qcow2_pwrite_zeroes(qemu_coroutine_self(), offset, bytes); |
Denis V. Lunev | 5a64e94 | 2016-05-25 21:48:47 -0600 | [diff] [blame] | 4023 | |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4024 | /* Whatever is left can use real zero subclusters */ |
| 4025 | ret = qcow2_subcluster_zeroize(bs, offset, bytes, flags); |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 4026 | qemu_co_mutex_unlock(&s->lock); |
| 4027 | |
| 4028 | return ret; |
| 4029 | } |
| 4030 | |
Eric Blake | 82e8a78 | 2016-07-15 17:23:03 -0600 | [diff] [blame] | 4031 | static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 0c80228 | 2021-09-03 13:28:06 +0300 | [diff] [blame] | 4032 | int64_t offset, int64_t bytes) |
Kevin Wolf | 5ea929e | 2011-01-26 16:56:48 +0100 | [diff] [blame] | 4033 | { |
Paolo Bonzini | 6db39ae | 2011-10-20 13:16:25 +0200 | [diff] [blame] | 4034 | int ret; |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4035 | BDRVQcow2State *s = bs->opaque; |
Paolo Bonzini | 6db39ae | 2011-10-20 13:16:25 +0200 | [diff] [blame] | 4036 | |
Alberto Garcia | 80f5c01 | 2020-03-31 13:43:45 +0200 | [diff] [blame] | 4037 | /* If the image does not support QCOW_OFLAG_ZERO then discarding |
| 4038 | * clusters could expose stale data from the backing file. */ |
| 4039 | if (s->qcow_version < 3 && bs->backing) { |
| 4040 | return -ENOTSUP; |
| 4041 | } |
| 4042 | |
Manos Pitsidianakis | f5a5ca7 | 2017-06-09 13:18:08 +0300 | [diff] [blame] | 4043 | if (!QEMU_IS_ALIGNED(offset | bytes, s->cluster_size)) { |
| 4044 | assert(bytes < s->cluster_size); |
Eric Blake | 048c5fd | 2017-04-06 20:37:09 -0500 | [diff] [blame] | 4045 | /* Ignore partial clusters, except for the special case of the |
| 4046 | * complete partial cluster at the end of an unaligned file */ |
| 4047 | if (!QEMU_IS_ALIGNED(offset, s->cluster_size) || |
Manos Pitsidianakis | f5a5ca7 | 2017-06-09 13:18:08 +0300 | [diff] [blame] | 4048 | offset + bytes != bs->total_sectors * BDRV_SECTOR_SIZE) { |
Eric Blake | 048c5fd | 2017-04-06 20:37:09 -0500 | [diff] [blame] | 4049 | return -ENOTSUP; |
| 4050 | } |
Eric Blake | 49228d1 | 2016-11-17 14:13:57 -0600 | [diff] [blame] | 4051 | } |
| 4052 | |
Paolo Bonzini | 6db39ae | 2011-10-20 13:16:25 +0200 | [diff] [blame] | 4053 | qemu_co_mutex_lock(&s->lock); |
Manos Pitsidianakis | f5a5ca7 | 2017-06-09 13:18:08 +0300 | [diff] [blame] | 4054 | ret = qcow2_cluster_discard(bs, offset, bytes, QCOW2_DISCARD_REQUEST, |
Eric Blake | d2cb36a | 2017-05-06 19:05:52 -0500 | [diff] [blame] | 4055 | false); |
Paolo Bonzini | 6db39ae | 2011-10-20 13:16:25 +0200 | [diff] [blame] | 4056 | qemu_co_mutex_unlock(&s->lock); |
| 4057 | return ret; |
Kevin Wolf | 5ea929e | 2011-01-26 16:56:48 +0100 | [diff] [blame] | 4058 | } |
| 4059 | |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4060 | static int coroutine_fn |
| 4061 | qcow2_co_copy_range_from(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 4853504 | 2021-09-03 13:28:01 +0300 | [diff] [blame] | 4062 | BdrvChild *src, int64_t src_offset, |
| 4063 | BdrvChild *dst, int64_t dst_offset, |
| 4064 | int64_t bytes, BdrvRequestFlags read_flags, |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4065 | BdrvRequestFlags write_flags) |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4066 | { |
| 4067 | BDRVQcow2State *s = bs->opaque; |
| 4068 | int ret; |
| 4069 | unsigned int cur_bytes; /* number of bytes in current iteration */ |
| 4070 | BdrvChild *child = NULL; |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4071 | BdrvRequestFlags cur_write_flags; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4072 | |
| 4073 | assert(!bs->encrypted); |
| 4074 | qemu_co_mutex_lock(&s->lock); |
| 4075 | |
| 4076 | while (bytes != 0) { |
| 4077 | uint64_t copy_offset = 0; |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4078 | QCow2SubclusterType type; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4079 | /* prepare next request */ |
| 4080 | cur_bytes = MIN(bytes, INT_MAX); |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4081 | cur_write_flags = write_flags; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4082 | |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 4083 | ret = qcow2_get_host_offset(bs, src_offset, &cur_bytes, |
| 4084 | ©_offset, &type); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4085 | if (ret < 0) { |
| 4086 | goto out; |
| 4087 | } |
| 4088 | |
Alberto Garcia | ca4a0bb | 2020-07-10 18:12:59 +0200 | [diff] [blame] | 4089 | switch (type) { |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4090 | case QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN: |
Alberto Garcia | 97490a1 | 2020-07-10 18:13:01 +0200 | [diff] [blame] | 4091 | case QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC: |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4092 | if (bs->backing && bs->backing->bs) { |
| 4093 | int64_t backing_length = bdrv_getlength(bs->backing->bs); |
| 4094 | if (src_offset >= backing_length) { |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4095 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4096 | } else { |
| 4097 | child = bs->backing; |
| 4098 | cur_bytes = MIN(cur_bytes, backing_length - src_offset); |
| 4099 | copy_offset = src_offset; |
| 4100 | } |
| 4101 | } else { |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4102 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4103 | } |
| 4104 | break; |
| 4105 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4106 | case QCOW2_SUBCLUSTER_ZERO_PLAIN: |
| 4107 | case QCOW2_SUBCLUSTER_ZERO_ALLOC: |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4108 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4109 | break; |
| 4110 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4111 | case QCOW2_SUBCLUSTER_COMPRESSED: |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4112 | ret = -ENOTSUP; |
| 4113 | goto out; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4114 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4115 | case QCOW2_SUBCLUSTER_NORMAL: |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4116 | child = s->data_file; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4117 | break; |
| 4118 | |
| 4119 | default: |
| 4120 | abort(); |
| 4121 | } |
| 4122 | qemu_co_mutex_unlock(&s->lock); |
| 4123 | ret = bdrv_co_copy_range_from(child, |
| 4124 | copy_offset, |
| 4125 | dst, dst_offset, |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4126 | cur_bytes, read_flags, cur_write_flags); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4127 | qemu_co_mutex_lock(&s->lock); |
| 4128 | if (ret < 0) { |
| 4129 | goto out; |
| 4130 | } |
| 4131 | |
| 4132 | bytes -= cur_bytes; |
| 4133 | src_offset += cur_bytes; |
| 4134 | dst_offset += cur_bytes; |
| 4135 | } |
| 4136 | ret = 0; |
| 4137 | |
| 4138 | out: |
| 4139 | qemu_co_mutex_unlock(&s->lock); |
| 4140 | return ret; |
| 4141 | } |
| 4142 | |
| 4143 | static int coroutine_fn |
| 4144 | qcow2_co_copy_range_to(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 4853504 | 2021-09-03 13:28:01 +0300 | [diff] [blame] | 4145 | BdrvChild *src, int64_t src_offset, |
| 4146 | BdrvChild *dst, int64_t dst_offset, |
| 4147 | int64_t bytes, BdrvRequestFlags read_flags, |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4148 | BdrvRequestFlags write_flags) |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4149 | { |
| 4150 | BDRVQcow2State *s = bs->opaque; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4151 | int ret; |
| 4152 | unsigned int cur_bytes; /* number of sectors in current iteration */ |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 4153 | uint64_t host_offset; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4154 | QCowL2Meta *l2meta = NULL; |
| 4155 | |
| 4156 | assert(!bs->encrypted); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4157 | |
| 4158 | qemu_co_mutex_lock(&s->lock); |
| 4159 | |
| 4160 | while (bytes != 0) { |
| 4161 | |
| 4162 | l2meta = NULL; |
| 4163 | |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4164 | cur_bytes = MIN(bytes, INT_MAX); |
| 4165 | |
| 4166 | /* TODO: |
| 4167 | * If src->bs == dst->bs, we could simply copy by incrementing |
| 4168 | * the refcnt, without copying user data. |
| 4169 | * Or if src->bs == dst->bs->backing->bs, we could copy by discarding. */ |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 4170 | ret = qcow2_alloc_host_offset(bs, dst_offset, &cur_bytes, |
| 4171 | &host_offset, &l2meta); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4172 | if (ret < 0) { |
| 4173 | goto fail; |
| 4174 | } |
| 4175 | |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 4176 | ret = qcow2_pre_write_overlap_check(bs, 0, host_offset, cur_bytes, |
| 4177 | true); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4178 | if (ret < 0) { |
| 4179 | goto fail; |
| 4180 | } |
| 4181 | |
| 4182 | qemu_co_mutex_unlock(&s->lock); |
Alberto Garcia | bfd0989 | 2020-09-11 16:09:42 +0200 | [diff] [blame] | 4183 | ret = bdrv_co_copy_range_to(src, src_offset, s->data_file, host_offset, |
Vladimir Sementsov-Ogievskiy | 67b51fb | 2018-07-09 19:37:17 +0300 | [diff] [blame] | 4184 | cur_bytes, read_flags, write_flags); |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4185 | qemu_co_mutex_lock(&s->lock); |
| 4186 | if (ret < 0) { |
| 4187 | goto fail; |
| 4188 | } |
| 4189 | |
| 4190 | ret = qcow2_handle_l2meta(bs, &l2meta, true); |
| 4191 | if (ret) { |
| 4192 | goto fail; |
| 4193 | } |
| 4194 | |
| 4195 | bytes -= cur_bytes; |
Fam Zheng | e06f463 | 2018-06-29 14:03:26 +0800 | [diff] [blame] | 4196 | src_offset += cur_bytes; |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4197 | dst_offset += cur_bytes; |
| 4198 | } |
| 4199 | ret = 0; |
| 4200 | |
| 4201 | fail: |
| 4202 | qcow2_handle_l2meta(bs, &l2meta, false); |
| 4203 | |
| 4204 | qemu_co_mutex_unlock(&s->lock); |
| 4205 | |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 4206 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
| 4207 | |
| 4208 | return ret; |
| 4209 | } |
| 4210 | |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4211 | static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, |
Max Reitz | c80d8b0 | 2019-09-18 11:51:40 +0200 | [diff] [blame] | 4212 | bool exact, PreallocMode prealloc, |
Kevin Wolf | 92b9279 | 2020-04-24 14:54:39 +0200 | [diff] [blame] | 4213 | BdrvRequestFlags flags, Error **errp) |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4214 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4215 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4216 | uint64_t old_length; |
Kevin Wolf | 2cf7cfa | 2013-05-14 16:14:33 +0200 | [diff] [blame] | 4217 | int64_t new_l1_size; |
| 4218 | int ret; |
Leonid Bloch | 45b4949 | 2018-09-26 19:04:45 +0300 | [diff] [blame] | 4219 | QDict *options; |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4220 | |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4221 | if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA && |
| 4222 | prealloc != PREALLOC_MODE_FALLOC && prealloc != PREALLOC_MODE_FULL) |
| 4223 | { |
Max Reitz | 8243ccb | 2017-06-13 22:20:52 +0200 | [diff] [blame] | 4224 | error_setg(errp, "Unsupported preallocation mode '%s'", |
Markus Armbruster | 977c736 | 2017-08-24 10:46:08 +0200 | [diff] [blame] | 4225 | PreallocMode_str(prealloc)); |
Max Reitz | 8243ccb | 2017-06-13 22:20:52 +0200 | [diff] [blame] | 4226 | return -ENOTSUP; |
| 4227 | } |
| 4228 | |
Alberto Garcia | 3afea40 | 2020-01-18 20:09:30 +0100 | [diff] [blame] | 4229 | if (!QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE)) { |
| 4230 | error_setg(errp, "The new size must be a multiple of %u", |
| 4231 | (unsigned) BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4232 | return -EINVAL; |
| 4233 | } |
| 4234 | |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4235 | qemu_co_mutex_lock(&s->lock); |
| 4236 | |
Eric Blake | 7fa140a | 2020-04-28 14:26:47 -0500 | [diff] [blame] | 4237 | /* |
| 4238 | * Even though we store snapshot size for all images, it was not |
| 4239 | * required until v3, so it is not safe to proceed for v2. |
| 4240 | */ |
| 4241 | if (s->nb_snapshots && s->qcow_version < 3) { |
| 4242 | error_setg(errp, "Can't resize a v2 image which has snapshots"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4243 | ret = -ENOTSUP; |
| 4244 | goto fail; |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4245 | } |
| 4246 | |
Eric Blake | ee1244a | 2020-04-28 14:26:48 -0500 | [diff] [blame] | 4247 | /* See qcow2-bitmap.c for which bitmap scenarios prevent a resize. */ |
John Snow | d19c6b3 | 2019-03-11 21:51:46 +0300 | [diff] [blame] | 4248 | if (qcow2_truncate_bitmaps_check(bs, errp)) { |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4249 | ret = -ENOTSUP; |
| 4250 | goto fail; |
Vladimir Sementsov-Ogievskiy | 88ddffa | 2017-06-28 15:05:08 +0300 | [diff] [blame] | 4251 | } |
| 4252 | |
Leonid Bloch | bd016b9 | 2018-09-26 19:04:47 +0300 | [diff] [blame] | 4253 | old_length = bs->total_sectors * BDRV_SECTOR_SIZE; |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4254 | new_l1_size = size_to_l1(s, offset); |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4255 | |
| 4256 | if (offset < old_length) { |
Pavel Butsykin | 163bc39 | 2017-09-29 15:16:13 +0300 | [diff] [blame] | 4257 | int64_t last_cluster, old_file_size; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4258 | if (prealloc != PREALLOC_MODE_OFF) { |
| 4259 | error_setg(errp, |
| 4260 | "Preallocation can't be used for shrinking an image"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4261 | ret = -EINVAL; |
| 4262 | goto fail; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4263 | } |
| 4264 | |
| 4265 | ret = qcow2_cluster_discard(bs, ROUND_UP(offset, s->cluster_size), |
| 4266 | old_length - ROUND_UP(offset, |
| 4267 | s->cluster_size), |
| 4268 | QCOW2_DISCARD_ALWAYS, true); |
| 4269 | if (ret < 0) { |
| 4270 | error_setg_errno(errp, -ret, "Failed to discard cropped clusters"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4271 | goto fail; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4272 | } |
| 4273 | |
| 4274 | ret = qcow2_shrink_l1_table(bs, new_l1_size); |
| 4275 | if (ret < 0) { |
| 4276 | error_setg_errno(errp, -ret, |
| 4277 | "Failed to reduce the number of L2 tables"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4278 | goto fail; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4279 | } |
| 4280 | |
| 4281 | ret = qcow2_shrink_reftable(bs); |
| 4282 | if (ret < 0) { |
| 4283 | error_setg_errno(errp, -ret, |
| 4284 | "Failed to discard unused refblocks"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4285 | goto fail; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4286 | } |
Pavel Butsykin | 163bc39 | 2017-09-29 15:16:13 +0300 | [diff] [blame] | 4287 | |
| 4288 | old_file_size = bdrv_getlength(bs->file->bs); |
| 4289 | if (old_file_size < 0) { |
| 4290 | error_setg_errno(errp, -old_file_size, |
| 4291 | "Failed to inquire current file length"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4292 | ret = old_file_size; |
| 4293 | goto fail; |
Pavel Butsykin | 163bc39 | 2017-09-29 15:16:13 +0300 | [diff] [blame] | 4294 | } |
| 4295 | last_cluster = qcow2_get_last_cluster(bs, old_file_size); |
| 4296 | if (last_cluster < 0) { |
| 4297 | error_setg_errno(errp, -last_cluster, |
| 4298 | "Failed to find the last cluster"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4299 | ret = last_cluster; |
| 4300 | goto fail; |
Pavel Butsykin | 163bc39 | 2017-09-29 15:16:13 +0300 | [diff] [blame] | 4301 | } |
| 4302 | if ((last_cluster + 1) * s->cluster_size < old_file_size) { |
Max Reitz | 233521b | 2017-10-09 17:54:31 +0200 | [diff] [blame] | 4303 | Error *local_err = NULL; |
| 4304 | |
Max Reitz | e61a28a | 2019-09-18 11:51:42 +0200 | [diff] [blame] | 4305 | /* |
| 4306 | * Do not pass @exact here: It will not help the user if |
| 4307 | * we get an error here just because they wanted to shrink |
| 4308 | * their qcow2 image (on a block device) with qemu-img. |
| 4309 | * (And on the qcow2 layer, the @exact requirement is |
| 4310 | * always fulfilled, so there is no need to pass it on.) |
| 4311 | */ |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4312 | bdrv_co_truncate(bs->file, (last_cluster + 1) * s->cluster_size, |
Kevin Wolf | 7b8e485 | 2020-04-24 14:54:40 +0200 | [diff] [blame] | 4313 | false, PREALLOC_MODE_OFF, 0, &local_err); |
Max Reitz | 233521b | 2017-10-09 17:54:31 +0200 | [diff] [blame] | 4314 | if (local_err) { |
| 4315 | warn_reportf_err(local_err, |
| 4316 | "Failed to truncate the tail of the image: "); |
Pavel Butsykin | 163bc39 | 2017-09-29 15:16:13 +0300 | [diff] [blame] | 4317 | } |
| 4318 | } |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4319 | } else { |
| 4320 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
| 4321 | if (ret < 0) { |
| 4322 | error_setg_errno(errp, -ret, "Failed to grow the L1 table"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4323 | goto fail; |
Pavel Butsykin | 46b732c | 2017-09-18 15:42:29 +0300 | [diff] [blame] | 4324 | } |
Max Reitz | 4841082 | 2021-03-26 15:55:08 +0100 | [diff] [blame] | 4325 | |
| 4326 | if (data_file_is_raw(bs) && prealloc == PREALLOC_MODE_OFF) { |
| 4327 | /* |
| 4328 | * When creating a qcow2 image with data-file-raw, we enforce |
| 4329 | * at least prealloc=metadata, so that the L1/L2 tables are |
| 4330 | * fully allocated and reading from the data file will return |
| 4331 | * the same data as reading from the qcow2 image. When the |
| 4332 | * image is grown, we must consequently preallocate the |
| 4333 | * metadata structures to cover the added area. |
| 4334 | */ |
| 4335 | prealloc = PREALLOC_MODE_METADATA; |
| 4336 | } |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4337 | } |
| 4338 | |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4339 | switch (prealloc) { |
| 4340 | case PREALLOC_MODE_OFF: |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 4341 | if (has_data_file(bs)) { |
Max Reitz | e61a28a | 2019-09-18 11:51:42 +0200 | [diff] [blame] | 4342 | /* |
| 4343 | * If the caller wants an exact resize, the external data |
| 4344 | * file should be resized to the exact target size, too, |
| 4345 | * so we pass @exact here. |
| 4346 | */ |
Kevin Wolf | 7b8e485 | 2020-04-24 14:54:40 +0200 | [diff] [blame] | 4347 | ret = bdrv_co_truncate(s->data_file, offset, exact, prealloc, 0, |
| 4348 | errp); |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 4349 | if (ret < 0) { |
| 4350 | goto fail; |
| 4351 | } |
| 4352 | } |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4353 | break; |
| 4354 | |
| 4355 | case PREALLOC_MODE_METADATA: |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 4356 | ret = preallocate_co(bs, old_length, offset, prealloc, errp); |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4357 | if (ret < 0) { |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4358 | goto fail; |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4359 | } |
| 4360 | break; |
| 4361 | |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4362 | case PREALLOC_MODE_FALLOC: |
| 4363 | case PREALLOC_MODE_FULL: |
| 4364 | { |
| 4365 | int64_t allocation_start, host_offset, guest_offset; |
| 4366 | int64_t clusters_allocated; |
Max Reitz | 4b96fa3 | 2020-05-05 16:18:01 +0200 | [diff] [blame] | 4367 | int64_t old_file_size, last_cluster, new_file_size; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4368 | uint64_t nb_new_data_clusters, nb_new_l2_tables; |
Alberto Garcia | 40dee94 | 2020-07-10 18:13:12 +0200 | [diff] [blame] | 4369 | bool subclusters_need_allocation = false; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4370 | |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4371 | /* With a data file, preallocation means just allocating the metadata |
| 4372 | * and forwarding the truncate request to the data file */ |
| 4373 | if (has_data_file(bs)) { |
Kevin Wolf | 718c0fc | 2019-04-15 16:34:30 +0200 | [diff] [blame] | 4374 | ret = preallocate_co(bs, old_length, offset, prealloc, errp); |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4375 | if (ret < 0) { |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4376 | goto fail; |
| 4377 | } |
| 4378 | break; |
| 4379 | } |
| 4380 | |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4381 | old_file_size = bdrv_getlength(bs->file->bs); |
| 4382 | if (old_file_size < 0) { |
| 4383 | error_setg_errno(errp, -old_file_size, |
| 4384 | "Failed to inquire current file length"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4385 | ret = old_file_size; |
| 4386 | goto fail; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4387 | } |
Max Reitz | 4b96fa3 | 2020-05-05 16:18:01 +0200 | [diff] [blame] | 4388 | |
| 4389 | last_cluster = qcow2_get_last_cluster(bs, old_file_size); |
| 4390 | if (last_cluster >= 0) { |
| 4391 | old_file_size = (last_cluster + 1) * s->cluster_size; |
| 4392 | } else { |
| 4393 | old_file_size = ROUND_UP(old_file_size, s->cluster_size); |
| 4394 | } |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4395 | |
Alberto Garcia | a5675f3 | 2020-06-17 16:00:36 +0200 | [diff] [blame] | 4396 | nb_new_data_clusters = (ROUND_UP(offset, s->cluster_size) - |
| 4397 | start_of_cluster(s, old_length)) >> s->cluster_bits; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4398 | |
| 4399 | /* This is an overestimation; we will not actually allocate space for |
| 4400 | * these in the file but just make sure the new refcount structures are |
| 4401 | * able to cover them so we will not have to allocate new refblocks |
| 4402 | * while entering the data blocks in the potentially new L2 tables. |
| 4403 | * (We do not actually care where the L2 tables are placed. Maybe they |
| 4404 | * are already allocated or they can be placed somewhere before |
| 4405 | * @old_file_size. It does not matter because they will be fully |
| 4406 | * allocated automatically, so they do not need to be covered by the |
| 4407 | * preallocation. All that matters is that we will not have to allocate |
| 4408 | * new refcount structures for them.) */ |
| 4409 | nb_new_l2_tables = DIV_ROUND_UP(nb_new_data_clusters, |
Alberto Garcia | c8fd855 | 2020-07-10 18:12:54 +0200 | [diff] [blame] | 4410 | s->cluster_size / l2_entry_size(s)); |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4411 | /* The cluster range may not be aligned to L2 boundaries, so add one L2 |
| 4412 | * table for a potential head/tail */ |
| 4413 | nb_new_l2_tables++; |
| 4414 | |
| 4415 | allocation_start = qcow2_refcount_area(bs, old_file_size, |
| 4416 | nb_new_data_clusters + |
| 4417 | nb_new_l2_tables, |
| 4418 | true, 0, 0); |
| 4419 | if (allocation_start < 0) { |
| 4420 | error_setg_errno(errp, -allocation_start, |
| 4421 | "Failed to resize refcount structures"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4422 | ret = allocation_start; |
| 4423 | goto fail; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4424 | } |
| 4425 | |
| 4426 | clusters_allocated = qcow2_alloc_clusters_at(bs, allocation_start, |
| 4427 | nb_new_data_clusters); |
| 4428 | if (clusters_allocated < 0) { |
| 4429 | error_setg_errno(errp, -clusters_allocated, |
| 4430 | "Failed to allocate data clusters"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4431 | ret = clusters_allocated; |
| 4432 | goto fail; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4433 | } |
| 4434 | |
| 4435 | assert(clusters_allocated == nb_new_data_clusters); |
| 4436 | |
| 4437 | /* Allocate the data area */ |
| 4438 | new_file_size = allocation_start + |
| 4439 | nb_new_data_clusters * s->cluster_size; |
Kevin Wolf | eb8a0cf | 2020-04-24 16:27:01 +0200 | [diff] [blame] | 4440 | /* |
| 4441 | * Image file grows, so @exact does not matter. |
| 4442 | * |
| 4443 | * If we need to zero out the new area, try first whether the protocol |
| 4444 | * driver can already take care of this. |
| 4445 | */ |
| 4446 | if (flags & BDRV_REQ_ZERO_WRITE) { |
| 4447 | ret = bdrv_co_truncate(bs->file, new_file_size, false, prealloc, |
| 4448 | BDRV_REQ_ZERO_WRITE, NULL); |
| 4449 | if (ret >= 0) { |
| 4450 | flags &= ~BDRV_REQ_ZERO_WRITE; |
Alberto Garcia | 40dee94 | 2020-07-10 18:13:12 +0200 | [diff] [blame] | 4451 | /* Ensure that we read zeroes and not backing file data */ |
| 4452 | subclusters_need_allocation = true; |
Kevin Wolf | eb8a0cf | 2020-04-24 16:27:01 +0200 | [diff] [blame] | 4453 | } |
| 4454 | } else { |
| 4455 | ret = -1; |
| 4456 | } |
| 4457 | if (ret < 0) { |
| 4458 | ret = bdrv_co_truncate(bs->file, new_file_size, false, prealloc, 0, |
| 4459 | errp); |
| 4460 | } |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4461 | if (ret < 0) { |
| 4462 | error_prepend(errp, "Failed to resize underlying file: "); |
| 4463 | qcow2_free_clusters(bs, allocation_start, |
| 4464 | nb_new_data_clusters * s->cluster_size, |
| 4465 | QCOW2_DISCARD_OTHER); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4466 | goto fail; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4467 | } |
| 4468 | |
| 4469 | /* Create the necessary L2 entries */ |
| 4470 | host_offset = allocation_start; |
| 4471 | guest_offset = old_length; |
| 4472 | while (nb_new_data_clusters) { |
Alberto Garcia | 13bec22 | 2018-02-05 16:33:31 +0200 | [diff] [blame] | 4473 | int64_t nb_clusters = MIN( |
| 4474 | nb_new_data_clusters, |
| 4475 | s->l2_slice_size - offset_to_l2_slice_index(s, guest_offset)); |
Alberto Garcia | a5675f3 | 2020-06-17 16:00:36 +0200 | [diff] [blame] | 4476 | unsigned cow_start_length = offset_into_cluster(s, guest_offset); |
| 4477 | QCowL2Meta allocation; |
| 4478 | guest_offset = start_of_cluster(s, guest_offset); |
| 4479 | allocation = (QCowL2Meta) { |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4480 | .offset = guest_offset, |
| 4481 | .alloc_offset = host_offset, |
| 4482 | .nb_clusters = nb_clusters, |
Alberto Garcia | a5675f3 | 2020-06-17 16:00:36 +0200 | [diff] [blame] | 4483 | .cow_start = { |
| 4484 | .offset = 0, |
| 4485 | .nb_bytes = cow_start_length, |
| 4486 | }, |
| 4487 | .cow_end = { |
| 4488 | .offset = nb_clusters << s->cluster_bits, |
| 4489 | .nb_bytes = 0, |
| 4490 | }, |
Alberto Garcia | 40dee94 | 2020-07-10 18:13:12 +0200 | [diff] [blame] | 4491 | .prealloc = !subclusters_need_allocation, |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4492 | }; |
| 4493 | qemu_co_queue_init(&allocation.dependent_requests); |
| 4494 | |
| 4495 | ret = qcow2_alloc_cluster_link_l2(bs, &allocation); |
| 4496 | if (ret < 0) { |
| 4497 | error_setg_errno(errp, -ret, "Failed to update L2 tables"); |
| 4498 | qcow2_free_clusters(bs, host_offset, |
| 4499 | nb_new_data_clusters * s->cluster_size, |
| 4500 | QCOW2_DISCARD_OTHER); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4501 | goto fail; |
Max Reitz | 772d1f9 | 2017-06-13 22:21:05 +0200 | [diff] [blame] | 4502 | } |
| 4503 | |
| 4504 | guest_offset += nb_clusters * s->cluster_size; |
| 4505 | host_offset += nb_clusters * s->cluster_size; |
| 4506 | nb_new_data_clusters -= nb_clusters; |
| 4507 | } |
| 4508 | break; |
| 4509 | } |
| 4510 | |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4511 | default: |
| 4512 | g_assert_not_reached(); |
| 4513 | } |
| 4514 | |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 4515 | if ((flags & BDRV_REQ_ZERO_WRITE) && offset > old_length) { |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4516 | uint64_t zero_start = QEMU_ALIGN_UP(old_length, s->subcluster_size); |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 4517 | |
| 4518 | /* |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4519 | * Use zero clusters as much as we can. qcow2_subcluster_zeroize() |
| 4520 | * requires a subcluster-aligned start. The end may be unaligned if |
| 4521 | * it is at the end of the image (which it is here). |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 4522 | */ |
Alberto Garcia | e4d7019 | 2020-05-04 17:52:17 +0200 | [diff] [blame] | 4523 | if (offset > zero_start) { |
Alberto Garcia | a6841a2 | 2020-07-10 18:13:10 +0200 | [diff] [blame] | 4524 | ret = qcow2_subcluster_zeroize(bs, zero_start, offset - zero_start, |
| 4525 | 0); |
Alberto Garcia | e4d7019 | 2020-05-04 17:52:17 +0200 | [diff] [blame] | 4526 | if (ret < 0) { |
| 4527 | error_setg_errno(errp, -ret, "Failed to zero out new clusters"); |
| 4528 | goto fail; |
| 4529 | } |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 4530 | } |
| 4531 | |
| 4532 | /* Write explicit zeros for the unaligned head */ |
| 4533 | if (zero_start > old_length) { |
Alberto Garcia | e4d7019 | 2020-05-04 17:52:17 +0200 | [diff] [blame] | 4534 | uint64_t len = MIN(zero_start, offset) - old_length; |
Kevin Wolf | f01643f | 2020-04-24 14:54:42 +0200 | [diff] [blame] | 4535 | uint8_t *buf = qemu_blockalign0(bs, len); |
| 4536 | QEMUIOVector qiov; |
| 4537 | qemu_iovec_init_buf(&qiov, buf, len); |
| 4538 | |
| 4539 | qemu_co_mutex_unlock(&s->lock); |
| 4540 | ret = qcow2_co_pwritev_part(bs, old_length, len, &qiov, 0, 0); |
| 4541 | qemu_co_mutex_lock(&s->lock); |
| 4542 | |
| 4543 | qemu_vfree(buf); |
| 4544 | if (ret < 0) { |
| 4545 | error_setg_errno(errp, -ret, "Failed to zero out the new area"); |
| 4546 | goto fail; |
| 4547 | } |
| 4548 | } |
| 4549 | } |
| 4550 | |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4551 | if (prealloc != PREALLOC_MODE_OFF) { |
| 4552 | /* Flush metadata before actually changing the image size */ |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4553 | ret = qcow2_write_caches(bs); |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4554 | if (ret < 0) { |
| 4555 | error_setg_errno(errp, -ret, |
| 4556 | "Failed to flush the preallocated area to disk"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4557 | goto fail; |
Max Reitz | 95b98f3 | 2017-06-13 22:21:02 +0200 | [diff] [blame] | 4558 | } |
| 4559 | } |
| 4560 | |
Leonid Bloch | 45b4949 | 2018-09-26 19:04:45 +0300 | [diff] [blame] | 4561 | bs->total_sectors = offset / BDRV_SECTOR_SIZE; |
| 4562 | |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4563 | /* write updated header.size */ |
| 4564 | offset = cpu_to_be64(offset); |
Alberto Faria | a8f0e83 | 2022-06-09 16:27:43 +0100 | [diff] [blame] | 4565 | ret = bdrv_co_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
| 4566 | sizeof(offset), &offset, 0); |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4567 | if (ret < 0) { |
Max Reitz | f59adb3 | 2017-03-28 22:51:29 +0200 | [diff] [blame] | 4568 | error_setg_errno(errp, -ret, "Failed to update the image size"); |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4569 | goto fail; |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4570 | } |
| 4571 | |
| 4572 | s->l1_vm_state_index = new_l1_size; |
Leonid Bloch | 45b4949 | 2018-09-26 19:04:45 +0300 | [diff] [blame] | 4573 | |
| 4574 | /* Update cache sizes */ |
| 4575 | options = qdict_clone_shallow(bs->options); |
| 4576 | ret = qcow2_update_options(bs, options, s->flags, errp); |
| 4577 | qobject_unref(options); |
| 4578 | if (ret < 0) { |
| 4579 | goto fail; |
| 4580 | } |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 4581 | ret = 0; |
| 4582 | fail: |
| 4583 | qemu_co_mutex_unlock(&s->lock); |
| 4584 | return ret; |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 4585 | } |
| 4586 | |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4587 | static coroutine_fn int |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4588 | qcow2_co_pwritev_compressed_task(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 4589 | uint64_t offset, uint64_t bytes, |
| 4590 | QEMUIOVector *qiov, size_t qiov_offset) |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4591 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4592 | BDRVQcow2State *s = bs->opaque; |
Vladimir Sementsov-Ogievskiy | 2714f13 | 2018-06-20 17:48:36 +0300 | [diff] [blame] | 4593 | int ret; |
Alberto Garcia | e1f4a37 | 2019-04-30 13:08:02 +0300 | [diff] [blame] | 4594 | ssize_t out_len; |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4595 | uint8_t *buf, *out_buf; |
Kevin Wolf | 77e023f | 2019-02-27 10:26:24 +0100 | [diff] [blame] | 4596 | uint64_t cluster_offset; |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4597 | |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4598 | assert(bytes == s->cluster_size || (bytes < s->cluster_size && |
| 4599 | (offset + bytes == bs->total_sectors << BDRV_SECTOR_BITS))); |
Anton Nefedov | 3e3b838 | 2017-11-14 13:16:49 +0300 | [diff] [blame] | 4600 | |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4601 | buf = qemu_blockalign(bs, s->cluster_size); |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4602 | if (bytes < s->cluster_size) { |
Pavel Butsykin | a2c0ca6 | 2016-07-22 11:17:44 +0300 | [diff] [blame] | 4603 | /* Zero-pad last write if image size is not cluster aligned */ |
| 4604 | memset(buf + bytes, 0, s->cluster_size - bytes); |
| 4605 | } |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 4606 | qemu_iovec_to_buf(qiov, qiov_offset, buf, bytes); |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4607 | |
Vladimir Sementsov-Ogievskiy | ebf7bba | 2016-07-14 19:59:25 +0300 | [diff] [blame] | 4608 | out_buf = g_malloc(s->cluster_size); |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4609 | |
Vladimir Sementsov-Ogievskiy | 6994fd7 | 2018-11-01 21:27:33 +0300 | [diff] [blame] | 4610 | out_len = qcow2_co_compress(bs, out_buf, s->cluster_size - 1, |
| 4611 | buf, s->cluster_size); |
Alberto Garcia | e1f4a37 | 2019-04-30 13:08:02 +0300 | [diff] [blame] | 4612 | if (out_len == -ENOMEM) { |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4613 | /* could not compress: write normal cluster */ |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 4614 | ret = qcow2_co_pwritev_part(bs, offset, bytes, qiov, qiov_offset, 0); |
Kevin Wolf | 8f1efd0 | 2011-10-18 17:12:44 +0200 | [diff] [blame] | 4615 | if (ret < 0) { |
| 4616 | goto fail; |
| 4617 | } |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4618 | goto success; |
Alberto Garcia | e1f4a37 | 2019-04-30 13:08:02 +0300 | [diff] [blame] | 4619 | } else if (out_len < 0) { |
| 4620 | ret = -EINVAL; |
| 4621 | goto fail; |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4622 | } |
| 4623 | |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4624 | qemu_co_mutex_lock(&s->lock); |
Kevin Wolf | 77e023f | 2019-02-27 10:26:24 +0100 | [diff] [blame] | 4625 | ret = qcow2_alloc_compressed_cluster_offset(bs, offset, out_len, |
| 4626 | &cluster_offset); |
| 4627 | if (ret < 0) { |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4628 | qemu_co_mutex_unlock(&s->lock); |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4629 | goto fail; |
| 4630 | } |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4631 | |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4632 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len, true); |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4633 | qemu_co_mutex_unlock(&s->lock); |
| 4634 | if (ret < 0) { |
| 4635 | goto fail; |
| 4636 | } |
| 4637 | |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 4638 | BLKDBG_EVENT(s->data_file, BLKDBG_WRITE_COMPRESSED); |
Vladimir Sementsov-Ogievskiy | b00cb15 | 2019-04-22 17:58:31 +0300 | [diff] [blame] | 4639 | ret = bdrv_co_pwrite(s->data_file, cluster_offset, out_len, out_buf, 0); |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4640 | if (ret < 0) { |
| 4641 | goto fail; |
| 4642 | } |
| 4643 | success: |
Kevin Wolf | 8f1efd0 | 2011-10-18 17:12:44 +0200 | [diff] [blame] | 4644 | ret = 0; |
| 4645 | fail: |
Pavel Butsykin | fcccefc | 2016-07-22 11:17:43 +0300 | [diff] [blame] | 4646 | qemu_vfree(buf); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4647 | g_free(out_buf); |
Kevin Wolf | 8f1efd0 | 2011-10-18 17:12:44 +0200 | [diff] [blame] | 4648 | return ret; |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4649 | } |
| 4650 | |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4651 | static coroutine_fn int qcow2_co_pwritev_compressed_task_entry(AioTask *task) |
| 4652 | { |
| 4653 | Qcow2AioTask *t = container_of(task, Qcow2AioTask, task); |
| 4654 | |
Alberto Garcia | 10dabdc5 | 2020-07-10 18:13:00 +0200 | [diff] [blame] | 4655 | assert(!t->subcluster_type && !t->l2meta); |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4656 | |
| 4657 | return qcow2_co_pwritev_compressed_task(t->bs, t->offset, t->bytes, t->qiov, |
| 4658 | t->qiov_offset); |
| 4659 | } |
| 4660 | |
| 4661 | /* |
| 4662 | * XXX: put compressed sectors first, then all the cluster aligned |
| 4663 | * tables to avoid losing bytes in alignment |
| 4664 | */ |
| 4665 | static coroutine_fn int |
| 4666 | qcow2_co_pwritev_compressed_part(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | e75abed | 2021-09-03 13:28:00 +0300 | [diff] [blame] | 4667 | int64_t offset, int64_t bytes, |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4668 | QEMUIOVector *qiov, size_t qiov_offset) |
| 4669 | { |
| 4670 | BDRVQcow2State *s = bs->opaque; |
| 4671 | AioTaskPool *aio = NULL; |
| 4672 | int ret = 0; |
| 4673 | |
| 4674 | if (has_data_file(bs)) { |
| 4675 | return -ENOTSUP; |
| 4676 | } |
| 4677 | |
| 4678 | if (bytes == 0) { |
| 4679 | /* |
| 4680 | * align end of file to a sector boundary to ease reading with |
| 4681 | * sector based I/Os |
| 4682 | */ |
| 4683 | int64_t len = bdrv_getlength(bs->file->bs); |
| 4684 | if (len < 0) { |
| 4685 | return len; |
| 4686 | } |
Kevin Wolf | 7b8e485 | 2020-04-24 14:54:40 +0200 | [diff] [blame] | 4687 | return bdrv_co_truncate(bs->file, len, false, PREALLOC_MODE_OFF, 0, |
| 4688 | NULL); |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4689 | } |
| 4690 | |
| 4691 | if (offset_into_cluster(s, offset)) { |
| 4692 | return -EINVAL; |
| 4693 | } |
| 4694 | |
Alberto Garcia | fb43d2d | 2020-04-06 16:34:01 +0200 | [diff] [blame] | 4695 | if (offset_into_cluster(s, bytes) && |
| 4696 | (offset + bytes) != (bs->total_sectors << BDRV_SECTOR_BITS)) { |
| 4697 | return -EINVAL; |
| 4698 | } |
| 4699 | |
Andrey Shinkevich | 0d483dc | 2019-12-02 15:15:05 +0300 | [diff] [blame] | 4700 | while (bytes && aio_task_pool_status(aio) == 0) { |
| 4701 | uint64_t chunk_size = MIN(bytes, s->cluster_size); |
| 4702 | |
| 4703 | if (!aio && chunk_size != bytes) { |
| 4704 | aio = aio_task_pool_new(QCOW2_MAX_WORKERS); |
| 4705 | } |
| 4706 | |
| 4707 | ret = qcow2_add_task(bs, aio, qcow2_co_pwritev_compressed_task_entry, |
| 4708 | 0, 0, offset, chunk_size, qiov, qiov_offset, NULL); |
| 4709 | if (ret < 0) { |
| 4710 | break; |
| 4711 | } |
| 4712 | qiov_offset += chunk_size; |
| 4713 | offset += chunk_size; |
| 4714 | bytes -= chunk_size; |
| 4715 | } |
| 4716 | |
| 4717 | if (aio) { |
| 4718 | aio_task_pool_wait_all(aio); |
| 4719 | if (ret == 0) { |
| 4720 | ret = aio_task_pool_status(aio); |
| 4721 | } |
| 4722 | g_free(aio); |
| 4723 | } |
| 4724 | |
| 4725 | return ret; |
| 4726 | } |
| 4727 | |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4728 | static int coroutine_fn |
| 4729 | qcow2_co_preadv_compressed(BlockDriverState *bs, |
Vladimir Sementsov-Ogievskiy | 9a3978a | 2021-09-14 15:24:46 +0300 | [diff] [blame] | 4730 | uint64_t l2_entry, |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4731 | uint64_t offset, |
| 4732 | uint64_t bytes, |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 4733 | QEMUIOVector *qiov, |
| 4734 | size_t qiov_offset) |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4735 | { |
| 4736 | BDRVQcow2State *s = bs->opaque; |
Vladimir Sementsov-Ogievskiy | a6e0984 | 2021-09-14 15:24:47 +0300 | [diff] [blame] | 4737 | int ret = 0, csize; |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4738 | uint64_t coffset; |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4739 | uint8_t *buf, *out_buf; |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4740 | int offset_in_cluster = offset_into_cluster(s, offset); |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4741 | |
Vladimir Sementsov-Ogievskiy | a6e0984 | 2021-09-14 15:24:47 +0300 | [diff] [blame] | 4742 | qcow2_parse_compressed_l2_entry(bs, l2_entry, &coffset, &csize); |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4743 | |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4744 | buf = g_try_malloc(csize); |
| 4745 | if (!buf) { |
| 4746 | return -ENOMEM; |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4747 | } |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4748 | |
| 4749 | out_buf = qemu_blockalign(bs, s->cluster_size); |
| 4750 | |
| 4751 | BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
Vladimir Sementsov-Ogievskiy | b00cb15 | 2019-04-22 17:58:31 +0300 | [diff] [blame] | 4752 | ret = bdrv_co_pread(bs->file, coffset, csize, buf, 0); |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4753 | if (ret < 0) { |
| 4754 | goto fail; |
| 4755 | } |
| 4756 | |
Vladimir Sementsov-Ogievskiy | e23c9d7 | 2018-11-01 21:27:38 +0300 | [diff] [blame] | 4757 | if (qcow2_co_decompress(bs, out_buf, s->cluster_size, buf, csize) < 0) { |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4758 | ret = -EIO; |
| 4759 | goto fail; |
| 4760 | } |
| 4761 | |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 4762 | qemu_iovec_from_buf(qiov, qiov_offset, out_buf + offset_in_cluster, bytes); |
Vladimir Sementsov-Ogievskiy | c3c10f7 | 2018-11-01 21:27:37 +0300 | [diff] [blame] | 4763 | |
| 4764 | fail: |
| 4765 | qemu_vfree(out_buf); |
| 4766 | g_free(buf); |
| 4767 | |
| 4768 | return ret; |
Vladimir Sementsov-Ogievskiy | f4b3e2a | 2018-11-01 21:27:34 +0300 | [diff] [blame] | 4769 | } |
| 4770 | |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4771 | static int make_completely_empty(BlockDriverState *bs) |
| 4772 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4773 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 4774 | Error *local_err = NULL; |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4775 | int ret, l1_clusters; |
| 4776 | int64_t offset; |
| 4777 | uint64_t *new_reftable = NULL; |
| 4778 | uint64_t rt_entry, l1_size2; |
| 4779 | struct { |
| 4780 | uint64_t l1_offset; |
| 4781 | uint64_t reftable_offset; |
| 4782 | uint32_t reftable_clusters; |
| 4783 | } QEMU_PACKED l1_ofs_rt_ofs_cls; |
| 4784 | |
| 4785 | ret = qcow2_cache_empty(bs, s->l2_table_cache); |
| 4786 | if (ret < 0) { |
| 4787 | goto fail; |
| 4788 | } |
| 4789 | |
| 4790 | ret = qcow2_cache_empty(bs, s->refcount_block_cache); |
| 4791 | if (ret < 0) { |
| 4792 | goto fail; |
| 4793 | } |
| 4794 | |
| 4795 | /* Refcounts will be broken utterly */ |
| 4796 | ret = qcow2_mark_dirty(bs); |
| 4797 | if (ret < 0) { |
| 4798 | goto fail; |
| 4799 | } |
| 4800 | |
| 4801 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); |
| 4802 | |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 4803 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / L1E_SIZE); |
| 4804 | l1_size2 = (uint64_t)s->l1_size * L1E_SIZE; |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4805 | |
| 4806 | /* After this call, neither the in-memory nor the on-disk refcount |
| 4807 | * information accurately describe the actual references */ |
| 4808 | |
Kevin Wolf | 720ff28 | 2016-06-16 15:13:15 +0200 | [diff] [blame] | 4809 | ret = bdrv_pwrite_zeroes(bs->file, s->l1_table_offset, |
Eric Blake | 74021bc | 2016-06-01 15:10:04 -0600 | [diff] [blame] | 4810 | l1_clusters * s->cluster_size, 0); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4811 | if (ret < 0) { |
| 4812 | goto fail_broken_refcounts; |
| 4813 | } |
| 4814 | memset(s->l1_table, 0, l1_size2); |
| 4815 | |
| 4816 | BLKDBG_EVENT(bs->file, BLKDBG_EMPTY_IMAGE_PREPARE); |
| 4817 | |
| 4818 | /* Overwrite enough clusters at the beginning of the sectors to place |
| 4819 | * the refcount table, a refcount block and the L1 table in; this may |
| 4820 | * overwrite parts of the existing refcount and L1 table, which is not |
| 4821 | * an issue because the dirty flag is set, complete data loss is in fact |
| 4822 | * desired and partial data loss is consequently fine as well */ |
Kevin Wolf | 720ff28 | 2016-06-16 15:13:15 +0200 | [diff] [blame] | 4823 | ret = bdrv_pwrite_zeroes(bs->file, s->cluster_size, |
Eric Blake | 74021bc | 2016-06-01 15:10:04 -0600 | [diff] [blame] | 4824 | (2 + l1_clusters) * s->cluster_size, 0); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4825 | /* This call (even if it failed overall) may have overwritten on-disk |
| 4826 | * refcount structures; in that case, the in-memory refcount information |
| 4827 | * will probably differ from the on-disk information which makes the BDS |
| 4828 | * unusable */ |
| 4829 | if (ret < 0) { |
| 4830 | goto fail_broken_refcounts; |
| 4831 | } |
| 4832 | |
| 4833 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); |
| 4834 | BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_UPDATE); |
| 4835 | |
| 4836 | /* "Create" an empty reftable (one cluster) directly after the image |
| 4837 | * header and an empty L1 table three clusters after the image header; |
| 4838 | * the cluster between those two will be used as the first refblock */ |
Peter Maydell | f1f7a1d | 2016-06-16 17:06:17 +0100 | [diff] [blame] | 4839 | l1_ofs_rt_ofs_cls.l1_offset = cpu_to_be64(3 * s->cluster_size); |
| 4840 | l1_ofs_rt_ofs_cls.reftable_offset = cpu_to_be64(s->cluster_size); |
| 4841 | l1_ofs_rt_ofs_cls.reftable_clusters = cpu_to_be32(1); |
Kevin Wolf | d9ca2ea | 2016-06-20 20:09:15 +0200 | [diff] [blame] | 4842 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset), |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 4843 | sizeof(l1_ofs_rt_ofs_cls), &l1_ofs_rt_ofs_cls, 0); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4844 | if (ret < 0) { |
| 4845 | goto fail_broken_refcounts; |
| 4846 | } |
| 4847 | |
| 4848 | s->l1_table_offset = 3 * s->cluster_size; |
| 4849 | |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 4850 | new_reftable = g_try_new0(uint64_t, s->cluster_size / REFTABLE_ENTRY_SIZE); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4851 | if (!new_reftable) { |
| 4852 | ret = -ENOMEM; |
| 4853 | goto fail_broken_refcounts; |
| 4854 | } |
| 4855 | |
| 4856 | s->refcount_table_offset = s->cluster_size; |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 4857 | s->refcount_table_size = s->cluster_size / REFTABLE_ENTRY_SIZE; |
Alberto Garcia | 7061a07 | 2017-02-01 14:38:28 +0200 | [diff] [blame] | 4858 | s->max_refcount_table_index = 0; |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4859 | |
| 4860 | g_free(s->refcount_table); |
| 4861 | s->refcount_table = new_reftable; |
| 4862 | new_reftable = NULL; |
| 4863 | |
| 4864 | /* Now the in-memory refcount information again corresponds to the on-disk |
| 4865 | * information (reftable is empty and no refblocks (the refblock cache is |
| 4866 | * empty)); however, this means some clusters (e.g. the image header) are |
| 4867 | * referenced, but not refcounted, but the normal qcow2 code assumes that |
| 4868 | * the in-memory information is always correct */ |
| 4869 | |
| 4870 | BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC); |
| 4871 | |
| 4872 | /* Enter the first refblock into the reftable */ |
| 4873 | rt_entry = cpu_to_be64(2 * s->cluster_size); |
Alberto Faria | 32cc71d | 2022-06-09 16:27:36 +0100 | [diff] [blame] | 4874 | ret = bdrv_pwrite_sync(bs->file, s->cluster_size, sizeof(rt_entry), |
| 4875 | &rt_entry, 0); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4876 | if (ret < 0) { |
| 4877 | goto fail_broken_refcounts; |
| 4878 | } |
| 4879 | s->refcount_table[0] = 2 * s->cluster_size; |
| 4880 | |
| 4881 | s->free_cluster_index = 0; |
| 4882 | assert(3 + l1_clusters <= s->refcount_block_size); |
| 4883 | offset = qcow2_alloc_clusters(bs, 3 * s->cluster_size + l1_size2); |
| 4884 | if (offset < 0) { |
| 4885 | ret = offset; |
| 4886 | goto fail_broken_refcounts; |
| 4887 | } else if (offset > 0) { |
| 4888 | error_report("First cluster in emptied image is in use"); |
| 4889 | abort(); |
| 4890 | } |
| 4891 | |
| 4892 | /* Now finally the in-memory information corresponds to the on-disk |
| 4893 | * structures and is correct */ |
| 4894 | ret = qcow2_mark_clean(bs); |
| 4895 | if (ret < 0) { |
| 4896 | goto fail; |
| 4897 | } |
| 4898 | |
Max Reitz | c80d8b0 | 2019-09-18 11:51:40 +0200 | [diff] [blame] | 4899 | ret = bdrv_truncate(bs->file, (3 + l1_clusters) * s->cluster_size, false, |
Kevin Wolf | 7b8e485 | 2020-04-24 14:54:40 +0200 | [diff] [blame] | 4900 | PREALLOC_MODE_OFF, 0, &local_err); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4901 | if (ret < 0) { |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 4902 | error_report_err(local_err); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4903 | goto fail; |
| 4904 | } |
| 4905 | |
| 4906 | return 0; |
| 4907 | |
| 4908 | fail_broken_refcounts: |
| 4909 | /* The BDS is unusable at this point. If we wanted to make it usable, we |
| 4910 | * would have to call qcow2_refcount_close(), qcow2_refcount_init(), |
| 4911 | * qcow2_check_refcounts(), qcow2_refcount_close() and qcow2_refcount_init() |
| 4912 | * again. However, because the functions which could have caused this error |
| 4913 | * path to be taken are used by those functions as well, it's very likely |
| 4914 | * that that sequence will fail as well. Therefore, just eject the BDS. */ |
| 4915 | bs->drv = NULL; |
| 4916 | |
| 4917 | fail: |
| 4918 | g_free(new_reftable); |
| 4919 | return ret; |
| 4920 | } |
| 4921 | |
Max Reitz | 491d27e | 2014-10-24 15:57:31 +0200 | [diff] [blame] | 4922 | static int qcow2_make_empty(BlockDriverState *bs) |
| 4923 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4924 | BDRVQcow2State *s = bs->opaque; |
Eric Blake | d2cb36a | 2017-05-06 19:05:52 -0500 | [diff] [blame] | 4925 | uint64_t offset, end_offset; |
| 4926 | int step = QEMU_ALIGN_DOWN(INT_MAX, s->cluster_size); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4927 | int l1_clusters, ret = 0; |
Max Reitz | 491d27e | 2014-10-24 15:57:31 +0200 | [diff] [blame] | 4928 | |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 4929 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / L1E_SIZE); |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4930 | |
Eric Blake | 4096974 | 2017-11-17 10:47:47 -0600 | [diff] [blame] | 4931 | if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps && |
Daniel P. Berrange | f060332 | 2017-11-17 11:29:13 +0000 | [diff] [blame] | 4932 | 3 + l1_clusters <= s->refcount_block_size && |
Kevin Wolf | db04524 | 2019-04-29 12:52:21 +0200 | [diff] [blame] | 4933 | s->crypt_method_header != QCOW_CRYPT_LUKS && |
| 4934 | !has_data_file(bs)) { |
Eric Blake | 4096974 | 2017-11-17 10:47:47 -0600 | [diff] [blame] | 4935 | /* The following function only works for qcow2 v3 images (it |
| 4936 | * requires the dirty flag) and only as long as there are no |
| 4937 | * features that reserve extra clusters (such as snapshots, |
| 4938 | * LUKS header, or persistent bitmaps), because it completely |
| 4939 | * empties the image. Furthermore, the L1 table and three |
| 4940 | * additional clusters (image header, refcount table, one |
Kevin Wolf | db04524 | 2019-04-29 12:52:21 +0200 | [diff] [blame] | 4941 | * refcount block) have to fit inside one refcount block. It |
| 4942 | * only resets the image file, i.e. does not work with an |
| 4943 | * external data file. */ |
Max Reitz | 9405418 | 2014-10-24 15:57:32 +0200 | [diff] [blame] | 4944 | return make_completely_empty(bs); |
| 4945 | } |
| 4946 | |
| 4947 | /* This fallback code simply discards every active cluster; this is slow, |
| 4948 | * but works in all cases */ |
Eric Blake | d2cb36a | 2017-05-06 19:05:52 -0500 | [diff] [blame] | 4949 | end_offset = bs->total_sectors * BDRV_SECTOR_SIZE; |
| 4950 | for (offset = 0; offset < end_offset; offset += step) { |
Max Reitz | 491d27e | 2014-10-24 15:57:31 +0200 | [diff] [blame] | 4951 | /* As this function is generally used after committing an external |
| 4952 | * snapshot, QCOW2_DISCARD_SNAPSHOT seems appropriate. Also, the |
| 4953 | * default action for this kind of discard is to pass the discard, |
| 4954 | * which will ideally result in an actually smaller image file, as |
| 4955 | * is probably desired. */ |
Eric Blake | d2cb36a | 2017-05-06 19:05:52 -0500 | [diff] [blame] | 4956 | ret = qcow2_cluster_discard(bs, offset, MIN(step, end_offset - offset), |
| 4957 | QCOW2_DISCARD_SNAPSHOT, true); |
Max Reitz | 491d27e | 2014-10-24 15:57:31 +0200 | [diff] [blame] | 4958 | if (ret < 0) { |
| 4959 | break; |
| 4960 | } |
| 4961 | } |
| 4962 | |
| 4963 | return ret; |
| 4964 | } |
| 4965 | |
Dong Xu Wang | a968168 | 2011-11-10 16:23:22 +0800 | [diff] [blame] | 4966 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 4967 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 4968 | BDRVQcow2State *s = bs->opaque; |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 4969 | int ret; |
| 4970 | |
Paolo Bonzini | 8b94ff8 | 2011-10-20 13:16:24 +0200 | [diff] [blame] | 4971 | qemu_co_mutex_lock(&s->lock); |
Paolo Bonzini | 8b220eb | 2018-03-01 17:36:14 +0100 | [diff] [blame] | 4972 | ret = qcow2_write_caches(bs); |
Paolo Bonzini | 8b94ff8 | 2011-10-20 13:16:24 +0200 | [diff] [blame] | 4973 | qemu_co_mutex_unlock(&s->lock); |
Kevin Wolf | 29c1a73 | 2011-01-10 17:17:28 +0100 | [diff] [blame] | 4974 | |
Paolo Bonzini | 8b220eb | 2018-03-01 17:36:14 +0100 | [diff] [blame] | 4975 | return ret; |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4976 | } |
| 4977 | |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 4978 | static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs, |
| 4979 | Error **errp) |
| 4980 | { |
| 4981 | Error *local_err = NULL; |
| 4982 | BlockMeasureInfo *info; |
| 4983 | uint64_t required = 0; /* bytes that contribute to required size */ |
| 4984 | uint64_t virtual_size; /* disk size as seen by guest */ |
| 4985 | uint64_t refcount_bits; |
| 4986 | uint64_t l2_tables; |
Stefan Hajnoczi | 61914f8 | 2019-02-18 10:45:24 +0000 | [diff] [blame] | 4987 | uint64_t luks_payload_size = 0; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 4988 | size_t cluster_size; |
| 4989 | int version; |
| 4990 | char *optstr; |
| 4991 | PreallocMode prealloc; |
| 4992 | bool has_backing_file; |
Stefan Hajnoczi | 61914f8 | 2019-02-18 10:45:24 +0000 | [diff] [blame] | 4993 | bool has_luks; |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 4994 | bool extended_l2; |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 4995 | size_t l2e_size; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 4996 | |
| 4997 | /* Parse image creation options */ |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 4998 | extended_l2 = qemu_opt_get_bool_del(opts, BLOCK_OPT_EXTL2, false); |
| 4999 | |
| 5000 | cluster_size = qcow2_opt_get_cluster_size_del(opts, extended_l2, |
| 5001 | &local_err); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5002 | if (local_err) { |
| 5003 | goto err; |
| 5004 | } |
| 5005 | |
| 5006 | version = qcow2_opt_get_version_del(opts, &local_err); |
| 5007 | if (local_err) { |
| 5008 | goto err; |
| 5009 | } |
| 5010 | |
| 5011 | refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err); |
| 5012 | if (local_err) { |
| 5013 | goto err; |
| 5014 | } |
| 5015 | |
| 5016 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); |
Marc-André Lureau | f7abe0e | 2017-08-24 10:46:10 +0200 | [diff] [blame] | 5017 | prealloc = qapi_enum_parse(&PreallocMode_lookup, optstr, |
Markus Armbruster | 06c60b6 | 2017-08-24 10:45:57 +0200 | [diff] [blame] | 5018 | PREALLOC_MODE_OFF, &local_err); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5019 | g_free(optstr); |
| 5020 | if (local_err) { |
| 5021 | goto err; |
| 5022 | } |
| 5023 | |
| 5024 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); |
| 5025 | has_backing_file = !!optstr; |
| 5026 | g_free(optstr); |
| 5027 | |
Stefan Hajnoczi | 61914f8 | 2019-02-18 10:45:24 +0000 | [diff] [blame] | 5028 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_ENCRYPT_FORMAT); |
| 5029 | has_luks = optstr && strcmp(optstr, "luks") == 0; |
| 5030 | g_free(optstr); |
| 5031 | |
| 5032 | if (has_luks) { |
Stefan Hajnoczi | 6d49d3a | 2020-02-21 11:25:19 +0000 | [diff] [blame] | 5033 | g_autoptr(QCryptoBlockCreateOptions) create_opts = NULL; |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5034 | QDict *cryptoopts = qcow2_extract_crypto_opts(opts, "luks", errp); |
Stefan Hajnoczi | 61914f8 | 2019-02-18 10:45:24 +0000 | [diff] [blame] | 5035 | size_t headerlen; |
| 5036 | |
Stefan Hajnoczi | 6d49d3a | 2020-02-21 11:25:19 +0000 | [diff] [blame] | 5037 | create_opts = block_crypto_create_opts_init(cryptoopts, errp); |
| 5038 | qobject_unref(cryptoopts); |
| 5039 | if (!create_opts) { |
| 5040 | goto err; |
| 5041 | } |
| 5042 | |
| 5043 | if (!qcrypto_block_calculate_payload_offset(create_opts, |
| 5044 | "encrypt.", |
| 5045 | &headerlen, |
| 5046 | &local_err)) { |
Stefan Hajnoczi | 61914f8 | 2019-02-18 10:45:24 +0000 | [diff] [blame] | 5047 | goto err; |
| 5048 | } |
| 5049 | |
| 5050 | luks_payload_size = ROUND_UP(headerlen, cluster_size); |
| 5051 | } |
| 5052 | |
Alberto Garcia | 9e02968 | 2018-02-15 15:10:08 +0200 | [diff] [blame] | 5053 | virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
| 5054 | virtual_size = ROUND_UP(virtual_size, cluster_size); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5055 | |
| 5056 | /* Check that virtual disk size is valid */ |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 5057 | l2e_size = extended_l2 ? L2E_SIZE_EXTENDED : L2E_SIZE_NORMAL; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5058 | l2_tables = DIV_ROUND_UP(virtual_size / cluster_size, |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 5059 | cluster_size / l2e_size); |
Alberto Garcia | 02b1ecf | 2020-08-28 13:08:28 +0200 | [diff] [blame] | 5060 | if (l2_tables * L1E_SIZE > QCOW_MAX_L1_SIZE) { |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5061 | error_setg(&local_err, "The image size is too large " |
| 5062 | "(try using a larger cluster size)"); |
| 5063 | goto err; |
| 5064 | } |
| 5065 | |
| 5066 | /* Account for input image */ |
| 5067 | if (in_bs) { |
| 5068 | int64_t ssize = bdrv_getlength(in_bs); |
| 5069 | if (ssize < 0) { |
| 5070 | error_setg_errno(&local_err, -ssize, |
| 5071 | "Unable to get image virtual_size"); |
| 5072 | goto err; |
| 5073 | } |
| 5074 | |
Alberto Garcia | 9e02968 | 2018-02-15 15:10:08 +0200 | [diff] [blame] | 5075 | virtual_size = ROUND_UP(ssize, cluster_size); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5076 | |
| 5077 | if (has_backing_file) { |
| 5078 | /* We don't how much of the backing chain is shared by the input |
| 5079 | * image and the new image file. In the worst case the new image's |
| 5080 | * backing file has nothing in common with the input image. Be |
| 5081 | * conservative and assume all clusters need to be written. |
| 5082 | */ |
| 5083 | required = virtual_size; |
| 5084 | } else { |
Eric Blake | b85ee45 | 2017-09-25 09:55:22 -0500 | [diff] [blame] | 5085 | int64_t offset; |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 5086 | int64_t pnum = 0; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5087 | |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 5088 | for (offset = 0; offset < ssize; offset += pnum) { |
| 5089 | int ret; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5090 | |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 5091 | ret = bdrv_block_status_above(in_bs, NULL, offset, |
| 5092 | ssize - offset, &pnum, NULL, |
| 5093 | NULL); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5094 | if (ret < 0) { |
| 5095 | error_setg_errno(&local_err, -ret, |
| 5096 | "Unable to get block status"); |
| 5097 | goto err; |
| 5098 | } |
| 5099 | |
| 5100 | if (ret & BDRV_BLOCK_ZERO) { |
| 5101 | /* Skip zero regions (safe with no backing file) */ |
| 5102 | } else if ((ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) == |
| 5103 | (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) { |
| 5104 | /* Extend pnum to end of cluster for next iteration */ |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 5105 | pnum = ROUND_UP(offset + pnum, cluster_size) - offset; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5106 | |
| 5107 | /* Count clusters we've seen */ |
Eric Blake | 3182664 | 2017-10-11 22:47:08 -0500 | [diff] [blame] | 5108 | required += offset % cluster_size + pnum; |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5109 | } |
| 5110 | } |
| 5111 | } |
| 5112 | } |
| 5113 | |
| 5114 | /* Take into account preallocation. Nothing special is needed for |
| 5115 | * PREALLOC_MODE_METADATA since metadata is always counted. |
| 5116 | */ |
| 5117 | if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) { |
| 5118 | required = virtual_size; |
| 5119 | } |
| 5120 | |
Eric Blake | 5d72c68 | 2020-05-21 14:21:34 -0500 | [diff] [blame] | 5121 | info = g_new0(BlockMeasureInfo, 1); |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 5122 | info->fully_allocated = luks_payload_size + |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5123 | qcow2_calc_prealloc_size(virtual_size, cluster_size, |
Alberto Garcia | 0dd07b2 | 2020-07-10 18:13:11 +0200 | [diff] [blame] | 5124 | ctz32(refcount_bits), extended_l2); |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5125 | |
Eric Blake | 5d72c68 | 2020-05-21 14:21:34 -0500 | [diff] [blame] | 5126 | /* |
| 5127 | * Remove data clusters that are not required. This overestimates the |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5128 | * required size because metadata needed for the fully allocated file is |
Eric Blake | 5d72c68 | 2020-05-21 14:21:34 -0500 | [diff] [blame] | 5129 | * still counted. Show bitmaps only if both source and destination |
| 5130 | * would support them. |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5131 | */ |
| 5132 | info->required = info->fully_allocated - virtual_size + required; |
Eric Blake | 5d72c68 | 2020-05-21 14:21:34 -0500 | [diff] [blame] | 5133 | info->has_bitmaps = version >= 3 && in_bs && |
| 5134 | bdrv_supports_persistent_dirty_bitmap(in_bs); |
| 5135 | if (info->has_bitmaps) { |
| 5136 | info->bitmaps = qcow2_get_persistent_dirty_bitmap_size(in_bs, |
| 5137 | cluster_size); |
| 5138 | } |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 5139 | return info; |
| 5140 | |
| 5141 | err: |
| 5142 | error_propagate(errp, local_err); |
| 5143 | return NULL; |
| 5144 | } |
| 5145 | |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 5146 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5147 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 5148 | BDRVQcow2State *s = bs->opaque; |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5149 | bdi->cluster_size = s->cluster_size; |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 5150 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
Vladimir Sementsov-Ogievskiy | 38b4409 | 2021-05-04 19:06:56 +0300 | [diff] [blame] | 5151 | bdi->is_dirty = s->incompatible_features & QCOW2_INCOMPAT_DIRTY; |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5152 | return 0; |
| 5153 | } |
| 5154 | |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 5155 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs, |
| 5156 | Error **errp) |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5157 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 5158 | BDRVQcow2State *s = bs->opaque; |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5159 | ImageInfoSpecific *spec_info; |
| 5160 | QCryptoBlockInfo *encrypt_info = NULL; |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5161 | |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5162 | if (s->crypto != NULL) { |
Vladimir Sementsov-Ogievskiy | 83bad8c | 2021-02-02 15:49:50 +0300 | [diff] [blame] | 5163 | encrypt_info = qcrypto_block_get_info(s->crypto, errp); |
| 5164 | if (!encrypt_info) { |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 5165 | return NULL; |
| 5166 | } |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5167 | } |
| 5168 | |
| 5169 | spec_info = g_new(ImageInfoSpecific, 1); |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5170 | *spec_info = (ImageInfoSpecific){ |
Eric Blake | 6a8f966 | 2015-10-26 16:34:54 -0600 | [diff] [blame] | 5171 | .type = IMAGE_INFO_SPECIFIC_KIND_QCOW2, |
Andrey Shinkevich | b8968c8 | 2019-02-08 18:06:07 +0300 | [diff] [blame] | 5172 | .u.qcow2.data = g_new0(ImageInfoSpecificQCow2, 1), |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5173 | }; |
| 5174 | if (s->qcow_version == 2) { |
Eric Blake | 32bafa8 | 2016-03-17 16:48:37 -0600 | [diff] [blame] | 5175 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
Max Reitz | 0709c5a | 2015-02-10 15:28:44 -0500 | [diff] [blame] | 5176 | .compat = g_strdup("0.10"), |
| 5177 | .refcount_bits = s->refcount_bits, |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5178 | }; |
| 5179 | } else if (s->qcow_version == 3) { |
Andrey Shinkevich | b8968c8 | 2019-02-08 18:06:07 +0300 | [diff] [blame] | 5180 | Qcow2BitmapInfoList *bitmaps; |
Vladimir Sementsov-Ogievskiy | 83bad8c | 2021-02-02 15:49:50 +0300 | [diff] [blame] | 5181 | if (!qcow2_get_bitmap_info_list(bs, &bitmaps, errp)) { |
Andrey Shinkevich | b8968c8 | 2019-02-08 18:06:07 +0300 | [diff] [blame] | 5182 | qapi_free_ImageInfoSpecific(spec_info); |
Eric Blake | 71eaec2 | 2020-03-20 13:36:20 -0500 | [diff] [blame] | 5183 | qapi_free_QCryptoBlockInfo(encrypt_info); |
Andrey Shinkevich | b8968c8 | 2019-02-08 18:06:07 +0300 | [diff] [blame] | 5184 | return NULL; |
| 5185 | } |
Eric Blake | 32bafa8 | 2016-03-17 16:48:37 -0600 | [diff] [blame] | 5186 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5187 | .compat = g_strdup("1.1"), |
| 5188 | .lazy_refcounts = s->compatible_features & |
| 5189 | QCOW2_COMPAT_LAZY_REFCOUNTS, |
| 5190 | .has_lazy_refcounts = true, |
Max Reitz | 9009b19 | 2014-09-30 21:31:28 +0200 | [diff] [blame] | 5191 | .corrupt = s->incompatible_features & |
| 5192 | QCOW2_INCOMPAT_CORRUPT, |
| 5193 | .has_corrupt = true, |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 5194 | .has_extended_l2 = true, |
| 5195 | .extended_l2 = has_subclusters(s), |
Max Reitz | 0709c5a | 2015-02-10 15:28:44 -0500 | [diff] [blame] | 5196 | .refcount_bits = s->refcount_bits, |
Andrey Shinkevich | b8968c8 | 2019-02-08 18:06:07 +0300 | [diff] [blame] | 5197 | .has_bitmaps = !!bitmaps, |
| 5198 | .bitmaps = bitmaps, |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 5199 | .data_file = g_strdup(s->image_data_file), |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 5200 | .has_data_file_raw = has_data_file(bs), |
| 5201 | .data_file_raw = data_file_is_raw(bs), |
Denis Plotnikov | 572ad97 | 2020-05-07 11:25:18 +0300 | [diff] [blame] | 5202 | .compression_type = s->compression_type, |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5203 | }; |
Denis V. Lunev | b1fc8f9 | 2015-12-10 12:55:48 +0300 | [diff] [blame] | 5204 | } else { |
| 5205 | /* if this assertion fails, this probably means a new version was |
| 5206 | * added without having it covered here */ |
| 5207 | assert(false); |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5208 | } |
| 5209 | |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5210 | if (encrypt_info) { |
| 5211 | ImageInfoSpecificQCow2Encryption *qencrypt = |
| 5212 | g_new(ImageInfoSpecificQCow2Encryption, 1); |
| 5213 | switch (encrypt_info->format) { |
| 5214 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: |
| 5215 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_AES; |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5216 | break; |
| 5217 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: |
| 5218 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_LUKS; |
| 5219 | qencrypt->u.luks = encrypt_info->u.luks; |
| 5220 | break; |
| 5221 | default: |
| 5222 | abort(); |
| 5223 | } |
| 5224 | /* Since we did shallow copy above, erase any pointers |
| 5225 | * in the original info */ |
| 5226 | memset(&encrypt_info->u, 0, sizeof(encrypt_info->u)); |
| 5227 | qapi_free_QCryptoBlockInfo(encrypt_info); |
| 5228 | |
Daniel P. Berrange | 0a12f6f | 2017-06-23 17:24:18 +0100 | [diff] [blame] | 5229 | spec_info->u.qcow2.data->encrypt = qencrypt; |
| 5230 | } |
| 5231 | |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 5232 | return spec_info; |
| 5233 | } |
| 5234 | |
Max Reitz | 38841dc | 2019-07-24 19:12:34 +0200 | [diff] [blame] | 5235 | static int qcow2_has_zero_init(BlockDriverState *bs) |
| 5236 | { |
| 5237 | BDRVQcow2State *s = bs->opaque; |
| 5238 | bool preallocated; |
| 5239 | |
| 5240 | if (qemu_in_coroutine()) { |
| 5241 | qemu_co_mutex_lock(&s->lock); |
| 5242 | } |
| 5243 | /* |
| 5244 | * Check preallocation status: Preallocated images have all L2 |
| 5245 | * tables allocated, nonpreallocated images have none. It is |
| 5246 | * therefore enough to check the first one. |
| 5247 | */ |
| 5248 | preallocated = s->l1_size > 0 && s->l1_table[0] != 0; |
| 5249 | if (qemu_in_coroutine()) { |
| 5250 | qemu_co_mutex_unlock(&s->lock); |
| 5251 | } |
| 5252 | |
| 5253 | if (!preallocated) { |
| 5254 | return 1; |
| 5255 | } else if (bs->encrypted) { |
| 5256 | return 0; |
| 5257 | } else { |
| 5258 | return bdrv_has_zero_init(s->data_file->bs); |
| 5259 | } |
| 5260 | } |
| 5261 | |
Vladimir Sementsov-Ogievskiy | 558902c | 2021-09-03 13:27:58 +0300 | [diff] [blame] | 5262 | /* |
| 5263 | * Check the request to vmstate. On success return |
| 5264 | * qcow2_vm_state_offset(bs) + @pos |
| 5265 | */ |
| 5266 | static int64_t qcow2_check_vmstate_request(BlockDriverState *bs, |
| 5267 | QEMUIOVector *qiov, int64_t pos) |
| 5268 | { |
| 5269 | BDRVQcow2State *s = bs->opaque; |
| 5270 | int64_t vmstate_offset = qcow2_vm_state_offset(s); |
| 5271 | int ret; |
| 5272 | |
| 5273 | /* Incoming requests must be OK */ |
| 5274 | bdrv_check_qiov_request(pos, qiov->size, qiov, 0, &error_abort); |
| 5275 | |
| 5276 | if (INT64_MAX - pos < vmstate_offset) { |
| 5277 | return -EIO; |
| 5278 | } |
| 5279 | |
| 5280 | pos += vmstate_offset; |
| 5281 | ret = bdrv_check_qiov_request(pos, qiov->size, qiov, 0, NULL); |
| 5282 | if (ret < 0) { |
| 5283 | return ret; |
| 5284 | } |
| 5285 | |
| 5286 | return pos; |
| 5287 | } |
| 5288 | |
Alberto Faria | 014688a | 2022-10-13 14:36:56 +0200 | [diff] [blame] | 5289 | static coroutine_fn int qcow2_save_vmstate(BlockDriverState *bs, |
| 5290 | QEMUIOVector *qiov, int64_t pos) |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5291 | { |
Vladimir Sementsov-Ogievskiy | 558902c | 2021-09-03 13:27:58 +0300 | [diff] [blame] | 5292 | int64_t offset = qcow2_check_vmstate_request(bs, qiov, pos); |
| 5293 | if (offset < 0) { |
| 5294 | return offset; |
| 5295 | } |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5296 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 5297 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
Vladimir Sementsov-Ogievskiy | 558902c | 2021-09-03 13:27:58 +0300 | [diff] [blame] | 5298 | return bs->drv->bdrv_co_pwritev_part(bs, offset, qiov->size, qiov, 0, 0); |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5299 | } |
| 5300 | |
Alberto Faria | 014688a | 2022-10-13 14:36:56 +0200 | [diff] [blame] | 5301 | static coroutine_fn int qcow2_load_vmstate(BlockDriverState *bs, |
| 5302 | QEMUIOVector *qiov, int64_t pos) |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5303 | { |
Vladimir Sementsov-Ogievskiy | 558902c | 2021-09-03 13:27:58 +0300 | [diff] [blame] | 5304 | int64_t offset = qcow2_check_vmstate_request(bs, qiov, pos); |
| 5305 | if (offset < 0) { |
| 5306 | return offset; |
| 5307 | } |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5308 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 5309 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
Vladimir Sementsov-Ogievskiy | 558902c | 2021-09-03 13:27:58 +0300 | [diff] [blame] | 5310 | return bs->drv->bdrv_co_preadv_part(bs, offset, qiov->size, qiov, 0, 0); |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 5311 | } |
| 5312 | |
Vladimir Sementsov-Ogievskiy | 083c245 | 2021-12-23 17:01:37 +0100 | [diff] [blame] | 5313 | static int qcow2_has_compressed_clusters(BlockDriverState *bs) |
| 5314 | { |
| 5315 | int64_t offset = 0; |
| 5316 | int64_t bytes = bdrv_getlength(bs); |
| 5317 | |
| 5318 | if (bytes < 0) { |
| 5319 | return bytes; |
| 5320 | } |
| 5321 | |
| 5322 | while (bytes != 0) { |
| 5323 | int ret; |
| 5324 | QCow2SubclusterType type; |
| 5325 | unsigned int cur_bytes = MIN(INT_MAX, bytes); |
| 5326 | uint64_t host_offset; |
| 5327 | |
| 5328 | ret = qcow2_get_host_offset(bs, offset, &cur_bytes, &host_offset, |
| 5329 | &type); |
| 5330 | if (ret < 0) { |
| 5331 | return ret; |
| 5332 | } |
| 5333 | |
| 5334 | if (type == QCOW2_SUBCLUSTER_COMPRESSED) { |
| 5335 | return 1; |
| 5336 | } |
| 5337 | |
| 5338 | offset += cur_bytes; |
| 5339 | bytes -= cur_bytes; |
| 5340 | } |
| 5341 | |
| 5342 | return 0; |
| 5343 | } |
| 5344 | |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5345 | /* |
| 5346 | * Downgrades an image's version. To achieve this, any incompatible features |
| 5347 | * have to be removed. |
| 5348 | */ |
Max Reitz | 4057a2b | 2014-10-27 11:12:53 +0100 | [diff] [blame] | 5349 | static int qcow2_downgrade(BlockDriverState *bs, int target_version, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5350 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
| 5351 | Error **errp) |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5352 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 5353 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5354 | int current_version = s->qcow_version; |
| 5355 | int ret; |
Eric Blake | 7fa140a | 2020-04-28 14:26:47 -0500 | [diff] [blame] | 5356 | int i; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5357 | |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5358 | /* This is qcow2_downgrade(), not qcow2_upgrade() */ |
| 5359 | assert(target_version < current_version); |
| 5360 | |
| 5361 | /* There are no other versions (now) that you can downgrade to */ |
| 5362 | assert(target_version == 2); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5363 | |
| 5364 | if (s->refcount_order != 4) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5365 | error_setg(errp, "compat=0.10 requires refcount_bits=16"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5366 | return -ENOTSUP; |
| 5367 | } |
| 5368 | |
Kevin Wolf | 966b000 | 2019-01-15 20:39:06 +0100 | [diff] [blame] | 5369 | if (has_data_file(bs)) { |
| 5370 | error_setg(errp, "Cannot downgrade an image with a data file"); |
| 5371 | return -ENOTSUP; |
| 5372 | } |
| 5373 | |
Eric Blake | 7fa140a | 2020-04-28 14:26:47 -0500 | [diff] [blame] | 5374 | /* |
| 5375 | * If any internal snapshot has a different size than the current |
| 5376 | * image size, or VM state size that exceeds 32 bits, downgrading |
| 5377 | * is unsafe. Even though we would still use v3-compliant output |
| 5378 | * to preserve that data, other v2 programs might not realize |
| 5379 | * those optional fields are important. |
| 5380 | */ |
| 5381 | for (i = 0; i < s->nb_snapshots; i++) { |
| 5382 | if (s->snapshots[i].vm_state_size > UINT32_MAX || |
| 5383 | s->snapshots[i].disk_size != bs->total_sectors * BDRV_SECTOR_SIZE) { |
| 5384 | error_setg(errp, "Internal snapshots prevent downgrade of image"); |
| 5385 | return -ENOTSUP; |
| 5386 | } |
| 5387 | } |
| 5388 | |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5389 | /* clear incompatible features */ |
| 5390 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { |
| 5391 | ret = qcow2_mark_clean(bs); |
| 5392 | if (ret < 0) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5393 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5394 | return ret; |
| 5395 | } |
| 5396 | } |
| 5397 | |
| 5398 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in |
| 5399 | * the first place; if that happens nonetheless, returning -ENOTSUP is the |
| 5400 | * best thing to do anyway */ |
| 5401 | |
Vladimir Sementsov-Ogievskiy | 083c245 | 2021-12-23 17:01:37 +0100 | [diff] [blame] | 5402 | if (s->incompatible_features & ~QCOW2_INCOMPAT_COMPRESSION) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5403 | error_setg(errp, "Cannot downgrade an image with incompatible features " |
Vladimir Sementsov-Ogievskiy | 083c245 | 2021-12-23 17:01:37 +0100 | [diff] [blame] | 5404 | "0x%" PRIx64 " set", |
| 5405 | s->incompatible_features & ~QCOW2_INCOMPAT_COMPRESSION); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5406 | return -ENOTSUP; |
| 5407 | } |
| 5408 | |
| 5409 | /* since we can ignore compatible features, we can set them to 0 as well */ |
| 5410 | s->compatible_features = 0; |
| 5411 | /* if lazy refcounts have been used, they have already been fixed through |
| 5412 | * clearing the dirty flag */ |
| 5413 | |
| 5414 | /* clearing autoclear features is trivial */ |
| 5415 | s->autoclear_features = 0; |
| 5416 | |
Max Reitz | 8b13976 | 2015-07-27 17:51:32 +0200 | [diff] [blame] | 5417 | ret = qcow2_expand_zero_clusters(bs, status_cb, cb_opaque); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5418 | if (ret < 0) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5419 | error_setg_errno(errp, -ret, "Failed to turn zero into data clusters"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5420 | return ret; |
| 5421 | } |
| 5422 | |
Vladimir Sementsov-Ogievskiy | 083c245 | 2021-12-23 17:01:37 +0100 | [diff] [blame] | 5423 | if (s->incompatible_features & QCOW2_INCOMPAT_COMPRESSION) { |
| 5424 | ret = qcow2_has_compressed_clusters(bs); |
| 5425 | if (ret < 0) { |
| 5426 | error_setg(errp, "Failed to check block status"); |
| 5427 | return -EINVAL; |
| 5428 | } |
| 5429 | if (ret) { |
| 5430 | error_setg(errp, "Cannot downgrade an image with zstd compression " |
| 5431 | "type and existing compressed clusters"); |
| 5432 | return -ENOTSUP; |
| 5433 | } |
| 5434 | /* |
| 5435 | * No compressed clusters for now, so just chose default zlib |
| 5436 | * compression. |
| 5437 | */ |
| 5438 | s->incompatible_features &= ~QCOW2_INCOMPAT_COMPRESSION; |
| 5439 | s->compression_type = QCOW2_COMPRESSION_TYPE_ZLIB; |
| 5440 | } |
| 5441 | |
| 5442 | assert(s->incompatible_features == 0); |
| 5443 | |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5444 | s->qcow_version = target_version; |
| 5445 | ret = qcow2_update_header(bs); |
| 5446 | if (ret < 0) { |
| 5447 | s->qcow_version = current_version; |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5448 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5449 | return ret; |
| 5450 | } |
| 5451 | return 0; |
| 5452 | } |
| 5453 | |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5454 | /* |
| 5455 | * Upgrades an image's version. While newer versions encompass all |
| 5456 | * features of older versions, some things may have to be presented |
| 5457 | * differently. |
| 5458 | */ |
| 5459 | static int qcow2_upgrade(BlockDriverState *bs, int target_version, |
| 5460 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
| 5461 | Error **errp) |
| 5462 | { |
| 5463 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 0a85af3 | 2019-10-11 17:28:05 +0200 | [diff] [blame] | 5464 | bool need_snapshot_update; |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5465 | int current_version = s->qcow_version; |
Max Reitz | 0a85af3 | 2019-10-11 17:28:05 +0200 | [diff] [blame] | 5466 | int i; |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5467 | int ret; |
| 5468 | |
| 5469 | /* This is qcow2_upgrade(), not qcow2_downgrade() */ |
| 5470 | assert(target_version > current_version); |
| 5471 | |
| 5472 | /* There are no other versions (yet) that you can upgrade to */ |
| 5473 | assert(target_version == 3); |
| 5474 | |
Max Reitz | 0a85af3 | 2019-10-11 17:28:05 +0200 | [diff] [blame] | 5475 | status_cb(bs, 0, 2, cb_opaque); |
| 5476 | |
| 5477 | /* |
| 5478 | * In v2, snapshots do not need to have extra data. v3 requires |
| 5479 | * the 64-bit VM state size and the virtual disk size to be |
| 5480 | * present. |
| 5481 | * qcow2_write_snapshots() will always write the list in the |
| 5482 | * v3-compliant format. |
| 5483 | */ |
| 5484 | need_snapshot_update = false; |
| 5485 | for (i = 0; i < s->nb_snapshots; i++) { |
| 5486 | if (s->snapshots[i].extra_data_size < |
| 5487 | sizeof_field(QCowSnapshotExtraData, vm_state_size_large) + |
| 5488 | sizeof_field(QCowSnapshotExtraData, disk_size)) |
| 5489 | { |
| 5490 | need_snapshot_update = true; |
| 5491 | break; |
| 5492 | } |
| 5493 | } |
| 5494 | if (need_snapshot_update) { |
| 5495 | ret = qcow2_write_snapshots(bs); |
| 5496 | if (ret < 0) { |
| 5497 | error_setg_errno(errp, -ret, "Failed to update the snapshot table"); |
| 5498 | return ret; |
| 5499 | } |
| 5500 | } |
| 5501 | status_cb(bs, 1, 2, cb_opaque); |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5502 | |
| 5503 | s->qcow_version = target_version; |
| 5504 | ret = qcow2_update_header(bs); |
| 5505 | if (ret < 0) { |
| 5506 | s->qcow_version = current_version; |
| 5507 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
| 5508 | return ret; |
| 5509 | } |
Max Reitz | 0a85af3 | 2019-10-11 17:28:05 +0200 | [diff] [blame] | 5510 | status_cb(bs, 2, 2, cb_opaque); |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5511 | |
| 5512 | return 0; |
| 5513 | } |
| 5514 | |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5515 | typedef enum Qcow2AmendOperation { |
| 5516 | /* This is the value Qcow2AmendHelperCBInfo::last_operation will be |
| 5517 | * statically initialized to so that the helper CB can discern the first |
| 5518 | * invocation from an operation change */ |
| 5519 | QCOW2_NO_OPERATION = 0, |
| 5520 | |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5521 | QCOW2_UPGRADING, |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5522 | QCOW2_UPDATING_ENCRYPTION, |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5523 | QCOW2_CHANGING_REFCOUNT_ORDER, |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5524 | QCOW2_DOWNGRADING, |
| 5525 | } Qcow2AmendOperation; |
| 5526 | |
| 5527 | typedef struct Qcow2AmendHelperCBInfo { |
| 5528 | /* The code coordinating the amend operations should only modify |
| 5529 | * these four fields; the rest will be managed by the CB */ |
| 5530 | BlockDriverAmendStatusCB *original_status_cb; |
| 5531 | void *original_cb_opaque; |
| 5532 | |
| 5533 | Qcow2AmendOperation current_operation; |
| 5534 | |
| 5535 | /* Total number of operations to perform (only set once) */ |
| 5536 | int total_operations; |
| 5537 | |
| 5538 | /* The following fields are managed by the CB */ |
| 5539 | |
| 5540 | /* Number of operations completed */ |
| 5541 | int operations_completed; |
| 5542 | |
| 5543 | /* Cumulative offset of all completed operations */ |
| 5544 | int64_t offset_completed; |
| 5545 | |
| 5546 | Qcow2AmendOperation last_operation; |
| 5547 | int64_t last_work_size; |
| 5548 | } Qcow2AmendHelperCBInfo; |
| 5549 | |
| 5550 | static void qcow2_amend_helper_cb(BlockDriverState *bs, |
| 5551 | int64_t operation_offset, |
| 5552 | int64_t operation_work_size, void *opaque) |
| 5553 | { |
| 5554 | Qcow2AmendHelperCBInfo *info = opaque; |
| 5555 | int64_t current_work_size; |
| 5556 | int64_t projected_work_size; |
| 5557 | |
| 5558 | if (info->current_operation != info->last_operation) { |
| 5559 | if (info->last_operation != QCOW2_NO_OPERATION) { |
| 5560 | info->offset_completed += info->last_work_size; |
| 5561 | info->operations_completed++; |
| 5562 | } |
| 5563 | |
| 5564 | info->last_operation = info->current_operation; |
| 5565 | } |
| 5566 | |
| 5567 | assert(info->total_operations > 0); |
| 5568 | assert(info->operations_completed < info->total_operations); |
| 5569 | |
| 5570 | info->last_work_size = operation_work_size; |
| 5571 | |
| 5572 | current_work_size = info->offset_completed + operation_work_size; |
| 5573 | |
| 5574 | /* current_work_size is the total work size for (operations_completed + 1) |
| 5575 | * operations (which includes this one), so multiply it by the number of |
| 5576 | * operations not covered and divide it by the number of operations |
| 5577 | * covered to get a projection for the operations not covered */ |
| 5578 | projected_work_size = current_work_size * (info->total_operations - |
| 5579 | info->operations_completed - 1) |
| 5580 | / (info->operations_completed + 1); |
| 5581 | |
| 5582 | info->original_status_cb(bs, info->offset_completed + operation_offset, |
| 5583 | current_work_size + projected_work_size, |
| 5584 | info->original_cb_opaque); |
| 5585 | } |
| 5586 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 5587 | static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | 8b13976 | 2015-07-27 17:51:32 +0200 | [diff] [blame] | 5588 | BlockDriverAmendStatusCB *status_cb, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5589 | void *cb_opaque, |
Maxim Levitsky | a3579bf | 2020-06-25 14:55:38 +0200 | [diff] [blame] | 5590 | bool force, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5591 | Error **errp) |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5592 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 5593 | BDRVQcow2State *s = bs->opaque; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5594 | int old_version = s->qcow_version, new_version = old_version; |
| 5595 | uint64_t new_size = 0; |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 5596 | const char *backing_file = NULL, *backing_format = NULL, *data_file = NULL; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5597 | bool lazy_refcounts = s->use_lazy_refcounts; |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 5598 | bool data_file_raw = data_file_is_raw(bs); |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5599 | const char *compat = NULL; |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5600 | int refcount_bits = s->refcount_bits; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5601 | int ret; |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5602 | QemuOptDesc *desc = opts->list->desc; |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5603 | Qcow2AmendHelperCBInfo helper_cb_info; |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5604 | bool encryption_update = false; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5605 | |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5606 | while (desc && desc->name) { |
| 5607 | if (!qemu_opt_find(opts, desc->name)) { |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5608 | /* only change explicitly defined options */ |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5609 | desc++; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5610 | continue; |
| 5611 | } |
| 5612 | |
Max Reitz | 8a17b83 | 2015-02-18 17:40:47 -0500 | [diff] [blame] | 5613 | if (!strcmp(desc->name, BLOCK_OPT_COMPAT_LEVEL)) { |
| 5614 | compat = qemu_opt_get(opts, BLOCK_OPT_COMPAT_LEVEL); |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5615 | if (!compat) { |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5616 | /* preserve default */ |
Eric Blake | f7077c9 | 2019-07-05 10:28:12 -0500 | [diff] [blame] | 5617 | } else if (!strcmp(compat, "0.10") || !strcmp(compat, "v2")) { |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5618 | new_version = 2; |
Eric Blake | f7077c9 | 2019-07-05 10:28:12 -0500 | [diff] [blame] | 5619 | } else if (!strcmp(compat, "1.1") || !strcmp(compat, "v3")) { |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5620 | new_version = 3; |
| 5621 | } else { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5622 | error_setg(errp, "Unknown compatibility level %s", compat); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5623 | return -EINVAL; |
| 5624 | } |
Max Reitz | 8a17b83 | 2015-02-18 17:40:47 -0500 | [diff] [blame] | 5625 | } else if (!strcmp(desc->name, BLOCK_OPT_SIZE)) { |
| 5626 | new_size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
| 5627 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FILE)) { |
| 5628 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 5629 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FMT)) { |
| 5630 | backing_format = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5631 | } else if (g_str_has_prefix(desc->name, "encrypt.")) { |
| 5632 | if (!s->crypto) { |
| 5633 | error_setg(errp, |
| 5634 | "Can't amend encryption options - encryption not present"); |
| 5635 | return -EINVAL; |
| 5636 | } |
| 5637 | if (s->crypt_method_header != QCOW_CRYPT_LUKS) { |
| 5638 | error_setg(errp, |
| 5639 | "Only LUKS encryption options can be amended"); |
| 5640 | return -ENOTSUP; |
| 5641 | } |
| 5642 | encryption_update = true; |
Max Reitz | 8a17b83 | 2015-02-18 17:40:47 -0500 | [diff] [blame] | 5643 | } else if (!strcmp(desc->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
| 5644 | lazy_refcounts = qemu_opt_get_bool(opts, BLOCK_OPT_LAZY_REFCOUNTS, |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5645 | lazy_refcounts); |
Max Reitz | 06d05fa | 2015-02-18 17:40:49 -0500 | [diff] [blame] | 5646 | } else if (!strcmp(desc->name, BLOCK_OPT_REFCOUNT_BITS)) { |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5647 | refcount_bits = qemu_opt_get_number(opts, BLOCK_OPT_REFCOUNT_BITS, |
| 5648 | refcount_bits); |
| 5649 | |
| 5650 | if (refcount_bits <= 0 || refcount_bits > 64 || |
| 5651 | !is_power_of_2(refcount_bits)) |
| 5652 | { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5653 | error_setg(errp, "Refcount width must be a power of two and " |
| 5654 | "may not exceed 64 bits"); |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5655 | return -EINVAL; |
| 5656 | } |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 5657 | } else if (!strcmp(desc->name, BLOCK_OPT_DATA_FILE)) { |
| 5658 | data_file = qemu_opt_get(opts, BLOCK_OPT_DATA_FILE); |
| 5659 | if (data_file && !has_data_file(bs)) { |
| 5660 | error_setg(errp, "data-file can only be set for images that " |
| 5661 | "use an external data file"); |
| 5662 | return -EINVAL; |
| 5663 | } |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 5664 | } else if (!strcmp(desc->name, BLOCK_OPT_DATA_FILE_RAW)) { |
| 5665 | data_file_raw = qemu_opt_get_bool(opts, BLOCK_OPT_DATA_FILE_RAW, |
| 5666 | data_file_raw); |
| 5667 | if (data_file_raw && !data_file_is_raw(bs)) { |
| 5668 | error_setg(errp, "data-file-raw cannot be set on existing " |
| 5669 | "images"); |
| 5670 | return -EINVAL; |
| 5671 | } |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5672 | } else { |
Max Reitz | 164e0f8 | 2015-07-27 17:51:34 +0200 | [diff] [blame] | 5673 | /* if this point is reached, this probably means a new option was |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5674 | * added without having it covered here */ |
Max Reitz | 164e0f8 | 2015-07-27 17:51:34 +0200 | [diff] [blame] | 5675 | abort(); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5676 | } |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5677 | |
| 5678 | desc++; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5679 | } |
| 5680 | |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5681 | helper_cb_info = (Qcow2AmendHelperCBInfo){ |
| 5682 | .original_status_cb = status_cb, |
| 5683 | .original_cb_opaque = cb_opaque, |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5684 | .total_operations = (new_version != old_version) |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5685 | + (s->refcount_bits != refcount_bits) + |
| 5686 | (encryption_update == true) |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5687 | }; |
| 5688 | |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5689 | /* Upgrade first (some features may require compat=1.1) */ |
| 5690 | if (new_version > old_version) { |
Max Reitz | 722efb0 | 2019-10-11 17:28:04 +0200 | [diff] [blame] | 5691 | helper_cb_info.current_operation = QCOW2_UPGRADING; |
| 5692 | ret = qcow2_upgrade(bs, new_version, &qcow2_amend_helper_cb, |
| 5693 | &helper_cb_info, errp); |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5694 | if (ret < 0) { |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5695 | return ret; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5696 | } |
| 5697 | } |
| 5698 | |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 5699 | if (encryption_update) { |
| 5700 | QDict *amend_opts_dict; |
| 5701 | QCryptoBlockAmendOptions *amend_opts; |
| 5702 | |
| 5703 | helper_cb_info.current_operation = QCOW2_UPDATING_ENCRYPTION; |
| 5704 | amend_opts_dict = qcow2_extract_crypto_opts(opts, "luks", errp); |
| 5705 | if (!amend_opts_dict) { |
| 5706 | return -EINVAL; |
| 5707 | } |
| 5708 | amend_opts = block_crypto_amend_opts_init(amend_opts_dict, errp); |
| 5709 | qobject_unref(amend_opts_dict); |
| 5710 | if (!amend_opts) { |
| 5711 | return -EINVAL; |
| 5712 | } |
| 5713 | ret = qcrypto_block_amend_options(s->crypto, |
| 5714 | qcow2_crypto_hdr_read_func, |
| 5715 | qcow2_crypto_hdr_write_func, |
| 5716 | bs, |
| 5717 | amend_opts, |
| 5718 | force, |
| 5719 | errp); |
| 5720 | qapi_free_QCryptoBlockAmendOptions(amend_opts); |
| 5721 | if (ret < 0) { |
| 5722 | return ret; |
| 5723 | } |
| 5724 | } |
| 5725 | |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5726 | if (s->refcount_bits != refcount_bits) { |
| 5727 | int refcount_order = ctz32(refcount_bits); |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5728 | |
| 5729 | if (new_version < 3 && refcount_bits != 16) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5730 | error_setg(errp, "Refcount widths other than 16 bits require " |
| 5731 | "compatibility level 1.1 or above (use compat=1.1 or " |
| 5732 | "greater)"); |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5733 | return -EINVAL; |
| 5734 | } |
| 5735 | |
| 5736 | helper_cb_info.current_operation = QCOW2_CHANGING_REFCOUNT_ORDER; |
| 5737 | ret = qcow2_change_refcount_order(bs, refcount_order, |
| 5738 | &qcow2_amend_helper_cb, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5739 | &helper_cb_info, errp); |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5740 | if (ret < 0) { |
Max Reitz | 61ce55f | 2015-07-27 17:51:38 +0200 | [diff] [blame] | 5741 | return ret; |
| 5742 | } |
| 5743 | } |
| 5744 | |
Kevin Wolf | 6c3944d | 2019-02-22 14:29:38 +0100 | [diff] [blame] | 5745 | /* data-file-raw blocks backing files, so clear it first if requested */ |
| 5746 | if (data_file_raw) { |
| 5747 | s->autoclear_features |= QCOW2_AUTOCLEAR_DATA_FILE_RAW; |
| 5748 | } else { |
| 5749 | s->autoclear_features &= ~QCOW2_AUTOCLEAR_DATA_FILE_RAW; |
| 5750 | } |
| 5751 | |
Kevin Wolf | 9b890bd | 2019-01-15 19:02:40 +0100 | [diff] [blame] | 5752 | if (data_file) { |
| 5753 | g_free(s->image_data_file); |
| 5754 | s->image_data_file = *data_file ? g_strdup(data_file) : NULL; |
| 5755 | } |
| 5756 | |
| 5757 | ret = qcow2_update_header(bs); |
| 5758 | if (ret < 0) { |
| 5759 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
| 5760 | return ret; |
| 5761 | } |
| 5762 | |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5763 | if (backing_file || backing_format) { |
Eric Blake | bc5ee6d | 2020-07-06 15:39:51 -0500 | [diff] [blame] | 5764 | if (g_strcmp0(backing_file, s->image_backing_file) || |
| 5765 | g_strcmp0(backing_format, s->image_backing_format)) { |
Eric Blake | 5a385bf | 2021-05-03 14:35:59 -0700 | [diff] [blame] | 5766 | error_setg(errp, "Cannot amend the backing file"); |
| 5767 | error_append_hint(errp, |
| 5768 | "You can use 'qemu-img rebase' instead.\n"); |
| 5769 | return -EINVAL; |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5770 | } |
| 5771 | } |
| 5772 | |
| 5773 | if (s->use_lazy_refcounts != lazy_refcounts) { |
| 5774 | if (lazy_refcounts) { |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5775 | if (new_version < 3) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5776 | error_setg(errp, "Lazy refcounts only supported with " |
| 5777 | "compatibility level 1.1 and above (use compat=1.1 " |
| 5778 | "or greater)"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5779 | return -EINVAL; |
| 5780 | } |
| 5781 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; |
| 5782 | ret = qcow2_update_header(bs); |
| 5783 | if (ret < 0) { |
| 5784 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5785 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5786 | return ret; |
| 5787 | } |
| 5788 | s->use_lazy_refcounts = true; |
| 5789 | } else { |
| 5790 | /* make image clean first */ |
| 5791 | ret = qcow2_mark_clean(bs); |
| 5792 | if (ret < 0) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5793 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5794 | return ret; |
| 5795 | } |
| 5796 | /* now disallow lazy refcounts */ |
| 5797 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; |
| 5798 | ret = qcow2_update_header(bs); |
| 5799 | if (ret < 0) { |
| 5800 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5801 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5802 | return ret; |
| 5803 | } |
| 5804 | s->use_lazy_refcounts = false; |
| 5805 | } |
| 5806 | } |
| 5807 | |
| 5808 | if (new_size) { |
Eric Blake | a3aeeab | 2020-04-28 14:26:46 -0500 | [diff] [blame] | 5809 | BlockBackend *blk = blk_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, |
| 5810 | errp); |
| 5811 | if (!blk) { |
| 5812 | return -EPERM; |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 5813 | } |
| 5814 | |
Max Reitz | e8d04f9 | 2019-09-18 11:51:43 +0200 | [diff] [blame] | 5815 | /* |
| 5816 | * Amending image options should ensure that the image has |
| 5817 | * exactly the given new values, so pass exact=true here. |
| 5818 | */ |
Kevin Wolf | 8c6242b | 2020-04-24 14:54:41 +0200 | [diff] [blame] | 5819 | ret = blk_truncate(blk, new_size, true, PREALLOC_MODE_OFF, 0, errp); |
Kevin Wolf | 70b27f3 | 2017-02-17 10:58:25 +0100 | [diff] [blame] | 5820 | blk_unref(blk); |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5821 | if (ret < 0) { |
| 5822 | return ret; |
| 5823 | } |
| 5824 | } |
| 5825 | |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5826 | /* Downgrade last (so unsupported features can be removed before) */ |
| 5827 | if (new_version < old_version) { |
Max Reitz | c293a80 | 2015-07-27 17:51:36 +0200 | [diff] [blame] | 5828 | helper_cb_info.current_operation = QCOW2_DOWNGRADING; |
| 5829 | ret = qcow2_downgrade(bs, new_version, &qcow2_amend_helper_cb, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5830 | &helper_cb_info, errp); |
Max Reitz | 1038bbb | 2015-07-27 17:51:35 +0200 | [diff] [blame] | 5831 | if (ret < 0) { |
| 5832 | return ret; |
| 5833 | } |
| 5834 | } |
| 5835 | |
Max Reitz | 9296b3e | 2013-09-03 10:09:54 +0200 | [diff] [blame] | 5836 | return 0; |
| 5837 | } |
| 5838 | |
Maxim Levitsky | 8ea1613 | 2020-06-25 14:55:47 +0200 | [diff] [blame] | 5839 | static int coroutine_fn qcow2_co_amend(BlockDriverState *bs, |
| 5840 | BlockdevAmendOptions *opts, |
| 5841 | bool force, |
| 5842 | Error **errp) |
| 5843 | { |
| 5844 | BlockdevAmendOptionsQcow2 *qopts = &opts->u.qcow2; |
| 5845 | BDRVQcow2State *s = bs->opaque; |
| 5846 | int ret = 0; |
| 5847 | |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 5848 | if (qopts->encrypt) { |
Maxim Levitsky | 8ea1613 | 2020-06-25 14:55:47 +0200 | [diff] [blame] | 5849 | if (!s->crypto) { |
| 5850 | error_setg(errp, "image is not encrypted, can't amend"); |
| 5851 | return -EOPNOTSUPP; |
| 5852 | } |
| 5853 | |
| 5854 | if (qopts->encrypt->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) { |
| 5855 | error_setg(errp, |
| 5856 | "Amend can't be used to change the qcow2 encryption format"); |
| 5857 | return -EOPNOTSUPP; |
| 5858 | } |
| 5859 | |
| 5860 | if (s->crypt_method_header != QCOW_CRYPT_LUKS) { |
| 5861 | error_setg(errp, |
| 5862 | "Only LUKS encryption options can be amended for qcow2 with blockdev-amend"); |
| 5863 | return -EOPNOTSUPP; |
| 5864 | } |
| 5865 | |
| 5866 | ret = qcrypto_block_amend_options(s->crypto, |
| 5867 | qcow2_crypto_hdr_read_func, |
| 5868 | qcow2_crypto_hdr_write_func, |
| 5869 | bs, |
| 5870 | qopts->encrypt, |
| 5871 | force, |
| 5872 | errp); |
| 5873 | } |
| 5874 | return ret; |
| 5875 | } |
| 5876 | |
Max Reitz | 85186eb | 2014-09-05 16:07:16 +0200 | [diff] [blame] | 5877 | /* |
| 5878 | * If offset or size are negative, respectively, they will not be included in |
| 5879 | * the BLOCK_IMAGE_CORRUPTED event emitted. |
| 5880 | * fatal will be ignored for read-only BDS; corruptions found there will always |
| 5881 | * be considered non-fatal. |
| 5882 | */ |
| 5883 | void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, |
| 5884 | int64_t size, const char *message_format, ...) |
| 5885 | { |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 5886 | BDRVQcow2State *s = bs->opaque; |
Alberto Garcia | dc881b4 | 2015-04-08 12:29:20 +0300 | [diff] [blame] | 5887 | const char *node_name; |
Max Reitz | 85186eb | 2014-09-05 16:07:16 +0200 | [diff] [blame] | 5888 | char *message; |
| 5889 | va_list ap; |
| 5890 | |
Max Reitz | ddf3b47 | 2018-06-06 21:37:01 +0200 | [diff] [blame] | 5891 | fatal = fatal && bdrv_is_writable(bs); |
Max Reitz | 85186eb | 2014-09-05 16:07:16 +0200 | [diff] [blame] | 5892 | |
| 5893 | if (s->signaled_corruption && |
| 5894 | (!fatal || (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT))) |
| 5895 | { |
| 5896 | return; |
| 5897 | } |
| 5898 | |
| 5899 | va_start(ap, message_format); |
| 5900 | message = g_strdup_vprintf(message_format, ap); |
| 5901 | va_end(ap); |
| 5902 | |
| 5903 | if (fatal) { |
| 5904 | fprintf(stderr, "qcow2: Marking image as corrupt: %s; further " |
| 5905 | "corruption events will be suppressed\n", message); |
| 5906 | } else { |
| 5907 | fprintf(stderr, "qcow2: Image is corrupt: %s; further non-fatal " |
| 5908 | "corruption events will be suppressed\n", message); |
| 5909 | } |
| 5910 | |
Alberto Garcia | dc881b4 | 2015-04-08 12:29:20 +0300 | [diff] [blame] | 5911 | node_name = bdrv_get_node_name(bs); |
| 5912 | qapi_event_send_block_image_corrupted(bdrv_get_device_name(bs), |
Markus Armbruster | 54fde4f | 2022-11-04 17:06:52 +0100 | [diff] [blame] | 5913 | *node_name ? node_name : NULL, |
Alberto Garcia | dc881b4 | 2015-04-08 12:29:20 +0300 | [diff] [blame] | 5914 | message, offset >= 0, offset, |
| 5915 | size >= 0, size, |
Peter Xu | 3ab7238 | 2018-08-15 21:37:37 +0800 | [diff] [blame] | 5916 | fatal); |
Max Reitz | 85186eb | 2014-09-05 16:07:16 +0200 | [diff] [blame] | 5917 | g_free(message); |
| 5918 | |
| 5919 | if (fatal) { |
| 5920 | qcow2_mark_corrupt(bs); |
| 5921 | bs->drv = NULL; /* make BDS unusable */ |
| 5922 | } |
| 5923 | |
| 5924 | s->signaled_corruption = true; |
| 5925 | } |
| 5926 | |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 5927 | #define QCOW_COMMON_OPTIONS \ |
| 5928 | { \ |
| 5929 | .name = BLOCK_OPT_SIZE, \ |
| 5930 | .type = QEMU_OPT_SIZE, \ |
| 5931 | .help = "Virtual disk size" \ |
| 5932 | }, \ |
| 5933 | { \ |
| 5934 | .name = BLOCK_OPT_COMPAT_LEVEL, \ |
| 5935 | .type = QEMU_OPT_STRING, \ |
| 5936 | .help = "Compatibility level (v2 [0.10] or v3 [1.1])" \ |
| 5937 | }, \ |
| 5938 | { \ |
| 5939 | .name = BLOCK_OPT_BACKING_FILE, \ |
| 5940 | .type = QEMU_OPT_STRING, \ |
| 5941 | .help = "File name of a base image" \ |
| 5942 | }, \ |
| 5943 | { \ |
| 5944 | .name = BLOCK_OPT_BACKING_FMT, \ |
| 5945 | .type = QEMU_OPT_STRING, \ |
| 5946 | .help = "Image format of the base image" \ |
| 5947 | }, \ |
| 5948 | { \ |
| 5949 | .name = BLOCK_OPT_DATA_FILE, \ |
| 5950 | .type = QEMU_OPT_STRING, \ |
| 5951 | .help = "File name of an external data file" \ |
| 5952 | }, \ |
| 5953 | { \ |
| 5954 | .name = BLOCK_OPT_DATA_FILE_RAW, \ |
| 5955 | .type = QEMU_OPT_BOOL, \ |
| 5956 | .help = "The external data file must stay valid " \ |
| 5957 | "as a raw image" \ |
| 5958 | }, \ |
| 5959 | { \ |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 5960 | .name = BLOCK_OPT_LAZY_REFCOUNTS, \ |
| 5961 | .type = QEMU_OPT_BOOL, \ |
| 5962 | .help = "Postpone refcount updates", \ |
| 5963 | .def_value_str = "off" \ |
| 5964 | }, \ |
| 5965 | { \ |
| 5966 | .name = BLOCK_OPT_REFCOUNT_BITS, \ |
| 5967 | .type = QEMU_OPT_NUMBER, \ |
| 5968 | .help = "Width of a reference count entry in bits", \ |
| 5969 | .def_value_str = "16" \ |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 5970 | } |
| 5971 | |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 5972 | static QemuOptsList qcow2_create_opts = { |
| 5973 | .name = "qcow2-create-opts", |
| 5974 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head), |
| 5975 | .desc = { |
Maxim Levitsky | 0b6786a | 2020-06-25 14:55:40 +0200 | [diff] [blame] | 5976 | { \ |
| 5977 | .name = BLOCK_OPT_ENCRYPT, \ |
| 5978 | .type = QEMU_OPT_BOOL, \ |
| 5979 | .help = "Encrypt the image with format 'aes'. (Deprecated " \ |
| 5980 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", \ |
| 5981 | }, \ |
| 5982 | { \ |
| 5983 | .name = BLOCK_OPT_ENCRYPT_FORMAT, \ |
| 5984 | .type = QEMU_OPT_STRING, \ |
| 5985 | .help = "Encrypt the image, format choices: 'aes', 'luks'", \ |
| 5986 | }, \ |
| 5987 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", \ |
| 5988 | "ID of secret providing qcow AES key or LUKS passphrase"), \ |
| 5989 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG("encrypt."), \ |
| 5990 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE("encrypt."), \ |
| 5991 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG("encrypt."), \ |
| 5992 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG("encrypt."), \ |
| 5993 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG("encrypt."), \ |
| 5994 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME("encrypt."), \ |
| 5995 | { \ |
| 5996 | .name = BLOCK_OPT_CLUSTER_SIZE, \ |
| 5997 | .type = QEMU_OPT_SIZE, \ |
| 5998 | .help = "qcow2 cluster size", \ |
| 5999 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) \ |
| 6000 | }, \ |
| 6001 | { \ |
Alberto Garcia | 7be2025 | 2020-07-10 18:13:13 +0200 | [diff] [blame] | 6002 | .name = BLOCK_OPT_EXTL2, \ |
| 6003 | .type = QEMU_OPT_BOOL, \ |
| 6004 | .help = "Extended L2 tables", \ |
| 6005 | .def_value_str = "off" \ |
| 6006 | }, \ |
| 6007 | { \ |
Maxim Levitsky | 0b6786a | 2020-06-25 14:55:40 +0200 | [diff] [blame] | 6008 | .name = BLOCK_OPT_PREALLOC, \ |
| 6009 | .type = QEMU_OPT_STRING, \ |
| 6010 | .help = "Preallocation mode (allowed values: off, " \ |
| 6011 | "metadata, falloc, full)" \ |
| 6012 | }, \ |
| 6013 | { \ |
| 6014 | .name = BLOCK_OPT_COMPRESSION_TYPE, \ |
| 6015 | .type = QEMU_OPT_STRING, \ |
| 6016 | .help = "Compression method used for image cluster " \ |
| 6017 | "compression", \ |
| 6018 | .def_value_str = "zlib" \ |
| 6019 | }, |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 6020 | QCOW_COMMON_OPTIONS, |
| 6021 | { /* end of list */ } |
| 6022 | } |
| 6023 | }; |
| 6024 | |
| 6025 | static QemuOptsList qcow2_amend_opts = { |
| 6026 | .name = "qcow2-amend-opts", |
| 6027 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_amend_opts.head), |
| 6028 | .desc = { |
Maxim Levitsky | 90766d9 | 2020-06-25 14:55:43 +0200 | [diff] [blame] | 6029 | BLOCK_CRYPTO_OPT_DEF_LUKS_STATE("encrypt."), |
| 6030 | BLOCK_CRYPTO_OPT_DEF_LUKS_KEYSLOT("encrypt."), |
| 6031 | BLOCK_CRYPTO_OPT_DEF_LUKS_OLD_SECRET("encrypt."), |
| 6032 | BLOCK_CRYPTO_OPT_DEF_LUKS_NEW_SECRET("encrypt."), |
| 6033 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME("encrypt."), |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 6034 | QCOW_COMMON_OPTIONS, |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 6035 | { /* end of list */ } |
| 6036 | } |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6037 | }; |
| 6038 | |
Max Reitz | 2654267 | 2019-02-01 20:29:25 +0100 | [diff] [blame] | 6039 | static const char *const qcow2_strong_runtime_opts[] = { |
| 6040 | "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, |
| 6041 | |
| 6042 | NULL |
| 6043 | }; |
| 6044 | |
Max Reitz | 5f535a9 | 2014-12-02 18:32:41 +0100 | [diff] [blame] | 6045 | BlockDriver bdrv_qcow2 = { |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 6046 | .format_name = "qcow2", |
Kevin Wolf | ff99129 | 2015-09-07 17:12:56 +0200 | [diff] [blame] | 6047 | .instance_size = sizeof(BDRVQcow2State), |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 6048 | .bdrv_probe = qcow2_probe, |
| 6049 | .bdrv_open = qcow2_open, |
| 6050 | .bdrv_close = qcow2_close, |
Jeff Cody | 21d82ac | 2012-09-20 15:13:28 -0400 | [diff] [blame] | 6051 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 6052 | .bdrv_reopen_commit = qcow2_reopen_commit, |
Peter Krempa | 65eb7c8 | 2020-02-28 13:44:47 +0100 | [diff] [blame] | 6053 | .bdrv_reopen_commit_post = qcow2_reopen_commit_post, |
Kevin Wolf | 5b0959a | 2015-04-16 13:42:27 +0200 | [diff] [blame] | 6054 | .bdrv_reopen_abort = qcow2_reopen_abort, |
Kevin Wolf | 5365f44 | 2015-11-16 15:34:59 +0100 | [diff] [blame] | 6055 | .bdrv_join_options = qcow2_join_options, |
Max Reitz | 69dca43 | 2020-05-13 13:05:39 +0200 | [diff] [blame] | 6056 | .bdrv_child_perm = bdrv_default_perms, |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 6057 | .bdrv_co_create_opts = qcow2_co_create_opts, |
Kevin Wolf | b0292b8 | 2018-01-09 16:50:57 +0100 | [diff] [blame] | 6058 | .bdrv_co_create = qcow2_co_create, |
Max Reitz | 38841dc | 2019-07-24 19:12:34 +0200 | [diff] [blame] | 6059 | .bdrv_has_zero_init = qcow2_has_zero_init, |
Eric Blake | a320fb0 | 2018-02-13 14:26:52 -0600 | [diff] [blame] | 6060 | .bdrv_co_block_status = qcow2_co_block_status, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6061 | |
Vladimir Sementsov-Ogievskiy | df893d2 | 2019-06-04 19:15:13 +0300 | [diff] [blame] | 6062 | .bdrv_co_preadv_part = qcow2_co_preadv_part, |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 6063 | .bdrv_co_pwritev_part = qcow2_co_pwritev_part, |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 6064 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
Stefan Hajnoczi | 419b19d | 2010-04-28 11:36:11 +0100 | [diff] [blame] | 6065 | |
Eric Blake | 5544b59 | 2016-06-01 15:10:06 -0600 | [diff] [blame] | 6066 | .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes, |
Eric Blake | 82e8a78 | 2016-07-15 17:23:03 -0600 | [diff] [blame] | 6067 | .bdrv_co_pdiscard = qcow2_co_pdiscard, |
Fam Zheng | fd9fcd3 | 2018-06-01 17:26:42 +0800 | [diff] [blame] | 6068 | .bdrv_co_copy_range_from = qcow2_co_copy_range_from, |
| 6069 | .bdrv_co_copy_range_to = qcow2_co_copy_range_to, |
Kevin Wolf | 061ca8a | 2018-06-21 17:54:35 +0200 | [diff] [blame] | 6070 | .bdrv_co_truncate = qcow2_co_truncate, |
Vladimir Sementsov-Ogievskiy | 5396234 | 2019-06-04 19:15:14 +0300 | [diff] [blame] | 6071 | .bdrv_co_pwritev_compressed_part = qcow2_co_pwritev_compressed_part, |
Max Reitz | 491d27e | 2014-10-24 15:57:31 +0200 | [diff] [blame] | 6072 | .bdrv_make_empty = qcow2_make_empty, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6073 | |
| 6074 | .bdrv_snapshot_create = qcow2_snapshot_create, |
| 6075 | .bdrv_snapshot_goto = qcow2_snapshot_goto, |
| 6076 | .bdrv_snapshot_delete = qcow2_snapshot_delete, |
| 6077 | .bdrv_snapshot_list = qcow2_snapshot_list, |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 6078 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
Stefan Hajnoczi | c501c35 | 2017-07-05 13:57:35 +0100 | [diff] [blame] | 6079 | .bdrv_measure = qcow2_measure, |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 6080 | .bdrv_get_info = qcow2_get_info, |
Max Reitz | 37764df | 2013-10-09 10:46:18 +0200 | [diff] [blame] | 6081 | .bdrv_get_specific_info = qcow2_get_specific_info, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6082 | |
Jes Sorensen | 7c80ab3 | 2010-12-17 16:02:39 +0100 | [diff] [blame] | 6083 | .bdrv_save_vmstate = qcow2_save_vmstate, |
| 6084 | .bdrv_load_vmstate = qcow2_load_vmstate, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6085 | |
Max Reitz | d67066d | 2020-05-13 13:05:12 +0200 | [diff] [blame] | 6086 | .is_format = true, |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 6087 | .supports_backing = true, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6088 | .bdrv_change_backing_file = qcow2_change_backing_file, |
| 6089 | |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 6090 | .bdrv_refresh_limits = qcow2_refresh_limits, |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 6091 | .bdrv_co_invalidate_cache = qcow2_co_invalidate_cache, |
Kevin Wolf | ec6d891 | 2015-12-22 16:04:57 +0100 | [diff] [blame] | 6092 | .bdrv_inactivate = qcow2_inactivate, |
Anthony Liguori | 06d9260 | 2011-11-14 15:09:46 -0600 | [diff] [blame] | 6093 | |
Chunyan Liu | 1bd0e2d | 2014-06-05 17:20:59 +0800 | [diff] [blame] | 6094 | .create_opts = &qcow2_create_opts, |
Maxim Levitsky | df373fb | 2020-06-25 14:55:39 +0200 | [diff] [blame] | 6095 | .amend_opts = &qcow2_amend_opts, |
Max Reitz | 2654267 | 2019-02-01 20:29:25 +0100 | [diff] [blame] | 6096 | .strong_runtime_opts = qcow2_strong_runtime_opts, |
Alberto Garcia | 8a2ce0b | 2019-03-12 18:48:48 +0200 | [diff] [blame] | 6097 | .mutable_opts = mutable_opts, |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 6098 | .bdrv_co_check = qcow2_co_check, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 6099 | .bdrv_amend_options = qcow2_amend_options, |
Maxim Levitsky | 8ea1613 | 2020-06-25 14:55:47 +0200 | [diff] [blame] | 6100 | .bdrv_co_amend = qcow2_co_amend, |
Alberto Garcia | 279621c | 2015-08-04 15:14:40 +0300 | [diff] [blame] | 6101 | |
| 6102 | .bdrv_detach_aio_context = qcow2_detach_aio_context, |
| 6103 | .bdrv_attach_aio_context = qcow2_attach_aio_context, |
Vladimir Sementsov-Ogievskiy | 1b6b056 | 2017-06-28 15:05:14 +0300 | [diff] [blame] | 6104 | |
Eric Blake | ef893b5 | 2020-05-12 20:16:42 -0500 | [diff] [blame] | 6105 | .bdrv_supports_persistent_dirty_bitmap = |
| 6106 | qcow2_supports_persistent_dirty_bitmap, |
Vladimir Sementsov-Ogievskiy | d2c3080 | 2019-09-20 11:25:43 +0300 | [diff] [blame] | 6107 | .bdrv_co_can_store_new_dirty_bitmap = qcow2_co_can_store_new_dirty_bitmap, |
| 6108 | .bdrv_co_remove_persistent_dirty_bitmap = |
| 6109 | qcow2_co_remove_persistent_dirty_bitmap, |
Blue Swirl | 20d9735 | 2010-04-23 20:19:47 +0000 | [diff] [blame] | 6110 | }; |
| 6111 | |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 6112 | static void bdrv_qcow2_init(void) |
| 6113 | { |
| 6114 | bdrv_register(&bdrv_qcow2); |
| 6115 | } |
| 6116 | |
| 6117 | block_init(bdrv_qcow2_init); |