ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Block driver for Parallels disk image format |
| 3 | * |
| 4 | * Copyright (c) 2007 Alex Beregszaszi |
| 5 | * |
| 6 | * This code is based on comparing different disk images created by Parallels. |
| 7 | * |
| 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 9 | * of this software and associated documentation files (the "Software"), to deal |
| 10 | * in the Software without restriction, including without limitation the rights |
| 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 12 | * copies of the Software, and to permit persons to whom the Software is |
| 13 | * furnished to do so, subject to the following conditions: |
| 14 | * |
| 15 | * The above copyright notice and this permission notice shall be included in |
| 16 | * all copies or substantial portions of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 24 | * THE SOFTWARE. |
| 25 | */ |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 26 | #include "qemu-common.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 27 | #include "block/block_int.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 28 | #include "qemu/module.h" |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 29 | |
| 30 | /**************************************************************/ |
| 31 | |
| 32 | #define HEADER_MAGIC "WithoutFreeSpace" |
| 33 | #define HEADER_VERSION 2 |
| 34 | #define HEADER_SIZE 64 |
| 35 | |
| 36 | // always little-endian |
| 37 | struct parallels_header { |
| 38 | char magic[16]; // "WithoutFreeSpace" |
| 39 | uint32_t version; |
| 40 | uint32_t heads; |
| 41 | uint32_t cylinders; |
| 42 | uint32_t tracks; |
| 43 | uint32_t catalog_entries; |
| 44 | uint32_t nb_sectors; |
| 45 | char padding[24]; |
Stefan Weil | 541dc0d | 2011-08-31 12:38:01 +0200 | [diff] [blame] | 46 | } QEMU_PACKED; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 47 | |
| 48 | typedef struct BDRVParallelsState { |
Paolo Bonzini | 848c66e | 2011-10-20 13:16:21 +0200 | [diff] [blame] | 49 | CoMutex lock; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 50 | |
| 51 | uint32_t *catalog_bitmap; |
Kevin Wolf | afbcc40 | 2014-03-26 13:06:08 +0100 | [diff] [blame] | 52 | unsigned int catalog_size; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 53 | |
Kevin Wolf | 9302e86 | 2014-03-26 13:06:09 +0100 | [diff] [blame] | 54 | unsigned int tracks; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 55 | } BDRVParallelsState; |
| 56 | |
| 57 | static int parallels_probe(const uint8_t *buf, int buf_size, const char *filename) |
| 58 | { |
| 59 | const struct parallels_header *ph = (const void *)buf; |
| 60 | |
| 61 | if (buf_size < HEADER_SIZE) |
| 62 | return 0; |
| 63 | |
| 64 | if (!memcmp(ph->magic, HEADER_MAGIC, 16) && |
| 65 | (le32_to_cpu(ph->version) == HEADER_VERSION)) |
| 66 | return 100; |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
Max Reitz | 015a103 | 2013-09-05 14:22:29 +0200 | [diff] [blame] | 71 | static int parallels_open(BlockDriverState *bs, QDict *options, int flags, |
| 72 | Error **errp) |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 73 | { |
| 74 | BDRVParallelsState *s = bs->opaque; |
Christoph Hellwig | 1dec5a7 | 2010-05-06 22:04:50 +0200 | [diff] [blame] | 75 | int i; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 76 | struct parallels_header ph; |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 77 | int ret; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 78 | |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 79 | bs->read_only = 1; // no write support yet |
| 80 | |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 81 | ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); |
| 82 | if (ret < 0) { |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 83 | goto fail; |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 84 | } |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 85 | |
| 86 | if (memcmp(ph.magic, HEADER_MAGIC, 16) || |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 87 | (le32_to_cpu(ph.version) != HEADER_VERSION)) { |
Paolo Bonzini | 76abe40 | 2014-02-17 14:44:06 +0100 | [diff] [blame] | 88 | error_setg(errp, "Image not in Parallels format"); |
| 89 | ret = -EINVAL; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 90 | goto fail; |
| 91 | } |
| 92 | |
| 93 | bs->total_sectors = le32_to_cpu(ph.nb_sectors); |
| 94 | |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 95 | s->tracks = le32_to_cpu(ph.tracks); |
Kevin Wolf | 9302e86 | 2014-03-26 13:06:09 +0100 | [diff] [blame] | 96 | if (s->tracks == 0) { |
| 97 | error_setg(errp, "Invalid image: Zero sectors per track"); |
| 98 | ret = -EINVAL; |
| 99 | goto fail; |
| 100 | } |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 101 | |
| 102 | s->catalog_size = le32_to_cpu(ph.catalog_entries); |
Kevin Wolf | afbcc40 | 2014-03-26 13:06:08 +0100 | [diff] [blame] | 103 | if (s->catalog_size > INT_MAX / 4) { |
| 104 | error_setg(errp, "Catalog too large"); |
| 105 | ret = -EFBIG; |
| 106 | goto fail; |
| 107 | } |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 108 | s->catalog_bitmap = g_malloc(s->catalog_size * 4); |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 109 | |
| 110 | ret = bdrv_pread(bs->file, 64, s->catalog_bitmap, s->catalog_size * 4); |
| 111 | if (ret < 0) { |
| 112 | goto fail; |
| 113 | } |
| 114 | |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 115 | for (i = 0; i < s->catalog_size; i++) |
| 116 | le32_to_cpus(&s->catalog_bitmap[i]); |
| 117 | |
Paolo Bonzini | 848c66e | 2011-10-20 13:16:21 +0200 | [diff] [blame] | 118 | qemu_co_mutex_init(&s->lock); |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 119 | return 0; |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 120 | |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 121 | fail: |
Kevin Wolf | 4653623 | 2013-01-25 17:07:32 +0100 | [diff] [blame] | 122 | g_free(s->catalog_bitmap); |
| 123 | return ret; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 124 | } |
| 125 | |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 126 | static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num) |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 127 | { |
| 128 | BDRVParallelsState *s = bs->opaque; |
David Woodhouse | c34d245 | 2009-11-07 14:10:01 +0000 | [diff] [blame] | 129 | uint32_t index, offset; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 130 | |
| 131 | index = sector_num / s->tracks; |
| 132 | offset = sector_num % s->tracks; |
| 133 | |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 134 | /* not allocated */ |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 135 | if ((index > s->catalog_size) || (s->catalog_bitmap[index] == 0)) |
| 136 | return -1; |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 137 | return (uint64_t)(s->catalog_bitmap[index] + offset) * 512; |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static int parallels_read(BlockDriverState *bs, int64_t sector_num, |
| 141 | uint8_t *buf, int nb_sectors) |
| 142 | { |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 143 | while (nb_sectors > 0) { |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 144 | int64_t position = seek_to_sector(bs, sector_num); |
| 145 | if (position >= 0) { |
Christoph Hellwig | 1dec5a7 | 2010-05-06 22:04:50 +0200 | [diff] [blame] | 146 | if (bdrv_pread(bs->file, position, buf, 512) != 512) |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 147 | return -1; |
| 148 | } else { |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 149 | memset(buf, 0, 512); |
Christoph Hellwig | 9d8b88f | 2010-05-06 22:04:34 +0200 | [diff] [blame] | 150 | } |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 151 | nb_sectors--; |
| 152 | sector_num++; |
| 153 | buf += 512; |
| 154 | } |
| 155 | return 0; |
| 156 | } |
| 157 | |
Paolo Bonzini | 2914caa | 2011-10-20 13:16:22 +0200 | [diff] [blame] | 158 | static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num, |
| 159 | uint8_t *buf, int nb_sectors) |
| 160 | { |
| 161 | int ret; |
| 162 | BDRVParallelsState *s = bs->opaque; |
| 163 | qemu_co_mutex_lock(&s->lock); |
| 164 | ret = parallels_read(bs, sector_num, buf, nb_sectors); |
| 165 | qemu_co_mutex_unlock(&s->lock); |
| 166 | return ret; |
| 167 | } |
| 168 | |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 169 | static void parallels_close(BlockDriverState *bs) |
| 170 | { |
| 171 | BDRVParallelsState *s = bs->opaque; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 172 | g_free(s->catalog_bitmap); |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 173 | } |
| 174 | |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 175 | static BlockDriver bdrv_parallels = { |
aurel32 | e60f469 | 2009-03-07 22:00:29 +0000 | [diff] [blame] | 176 | .format_name = "parallels", |
| 177 | .instance_size = sizeof(BDRVParallelsState), |
| 178 | .bdrv_probe = parallels_probe, |
Christoph Hellwig | 1dec5a7 | 2010-05-06 22:04:50 +0200 | [diff] [blame] | 179 | .bdrv_open = parallels_open, |
Paolo Bonzini | 2914caa | 2011-10-20 13:16:22 +0200 | [diff] [blame] | 180 | .bdrv_read = parallels_co_read, |
aurel32 | e60f469 | 2009-03-07 22:00:29 +0000 | [diff] [blame] | 181 | .bdrv_close = parallels_close, |
ths | 6ada745 | 2007-07-31 23:28:53 +0000 | [diff] [blame] | 182 | }; |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 183 | |
| 184 | static void bdrv_parallels_init(void) |
| 185 | { |
| 186 | bdrv_register(&bdrv_parallels); |
| 187 | } |
| 188 | |
| 189 | block_init(bdrv_parallels_init); |