bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +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 | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 25 | #include "qemu/osdep.h" |
Daniel P. Berrange | 0ab8ed1 | 2017-01-25 16:14:15 +0000 | [diff] [blame] | 26 | #include "block/trace.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 27 | #include "block/block_int.h" |
| 28 | #include "block/blockjob.h" |
Kevin Wolf | cd7fca9 | 2016-07-06 11:22:39 +0200 | [diff] [blame] | 29 | #include "block/nbd.h" |
Max Reitz | 609f45e | 2018-06-14 21:14:28 +0200 | [diff] [blame] | 30 | #include "block/qdict.h" |
Markus Armbruster | d49b683 | 2015-03-17 18:29:20 +0100 | [diff] [blame] | 31 | #include "qemu/error-report.h" |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 32 | #include "module_block.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 33 | #include "qemu/module.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 34 | #include "qapi/error.h" |
Markus Armbruster | 452fcdb | 2018-02-01 12:18:39 +0100 | [diff] [blame] | 35 | #include "qapi/qmp/qdict.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 36 | #include "qapi/qmp/qjson.h" |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 37 | #include "qapi/qmp/qnull.h" |
Markus Armbruster | fc81fa1 | 2018-02-01 12:18:40 +0100 | [diff] [blame] | 38 | #include "qapi/qmp/qstring.h" |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 39 | #include "qapi/qobject-output-visitor.h" |
| 40 | #include "qapi/qapi-visit-block-core.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 41 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 42 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 43 | #include "qemu/notify.h" |
Markus Armbruster | 922a01a | 2018-02-01 12:18:46 +0100 | [diff] [blame] | 44 | #include "qemu/option.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 45 | #include "qemu/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 46 | #include "block/qapi.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 47 | #include "qemu/timer.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 48 | #include "qemu/cutils.h" |
| 49 | #include "qemu/id.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 50 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 51 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 52 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 53 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 54 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 55 | #include <sys/disk.h> |
| 56 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 57 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 58 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 59 | #ifdef _WIN32 |
| 60 | #include <windows.h> |
| 61 | #endif |
| 62 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 63 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 64 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 65 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 66 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 67 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 68 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
| 69 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); |
| 70 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 71 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 72 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 73 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 74 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
| 75 | const char *reference, |
| 76 | QDict *options, int flags, |
| 77 | BlockDriverState *parent, |
| 78 | const BdrvChildRole *child_role, |
| 79 | Error **errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 80 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 81 | /* If non-zero, use only whitelisted block drivers */ |
| 82 | static int use_bdrv_whitelist; |
| 83 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 84 | #ifdef _WIN32 |
| 85 | static int is_windows_drive_prefix(const char *filename) |
| 86 | { |
| 87 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 88 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 89 | filename[1] == ':'); |
| 90 | } |
| 91 | |
| 92 | int is_windows_drive(const char *filename) |
| 93 | { |
| 94 | if (is_windows_drive_prefix(filename) && |
| 95 | filename[2] == '\0') |
| 96 | return 1; |
| 97 | if (strstart(filename, "\\\\.\\", NULL) || |
| 98 | strstart(filename, "//./", NULL)) |
| 99 | return 1; |
| 100 | return 0; |
| 101 | } |
| 102 | #endif |
| 103 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 104 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 105 | { |
| 106 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 107 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 108 | return MAX(4096, getpagesize()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | return bs->bl.opt_mem_alignment; |
| 112 | } |
| 113 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 114 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 115 | { |
| 116 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 117 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 118 | return MAX(4096, getpagesize()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | return bs->bl.min_mem_alignment; |
| 122 | } |
| 123 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 124 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 125 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 126 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 127 | const char *p; |
| 128 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 129 | #ifdef _WIN32 |
| 130 | if (is_windows_drive(path) || |
| 131 | is_windows_drive_prefix(path)) { |
| 132 | return 0; |
| 133 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 134 | p = path + strcspn(path, ":/\\"); |
| 135 | #else |
| 136 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 137 | #endif |
| 138 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 139 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 140 | } |
| 141 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 142 | int path_is_absolute(const char *path) |
| 143 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 144 | #ifdef _WIN32 |
| 145 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 146 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 147 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 148 | } |
| 149 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 150 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 151 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 152 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 153 | } |
| 154 | |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 155 | /* if filename is absolute, just return its duplicate. Otherwise, build a |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 156 | path to it by considering it is relative to base_path. URL are |
| 157 | supported. */ |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 158 | char *path_combine(const char *base_path, const char *filename) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 159 | { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 160 | const char *protocol_stripped = NULL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 161 | const char *p, *p1; |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 162 | char *result; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 163 | int len; |
| 164 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 165 | if (path_is_absolute(filename)) { |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 166 | return g_strdup(filename); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 167 | } |
Max Reitz | 009b03a | 2019-02-01 20:29:13 +0100 | [diff] [blame] | 168 | |
| 169 | if (path_has_protocol(base_path)) { |
| 170 | protocol_stripped = strchr(base_path, ':'); |
| 171 | if (protocol_stripped) { |
| 172 | protocol_stripped++; |
| 173 | } |
| 174 | } |
| 175 | p = protocol_stripped ?: base_path; |
| 176 | |
| 177 | p1 = strrchr(base_path, '/'); |
| 178 | #ifdef _WIN32 |
| 179 | { |
| 180 | const char *p2; |
| 181 | p2 = strrchr(base_path, '\\'); |
| 182 | if (!p1 || p2 > p1) { |
| 183 | p1 = p2; |
| 184 | } |
| 185 | } |
| 186 | #endif |
| 187 | if (p1) { |
| 188 | p1++; |
| 189 | } else { |
| 190 | p1 = base_path; |
| 191 | } |
| 192 | if (p1 > p) { |
| 193 | p = p1; |
| 194 | } |
| 195 | len = p - base_path; |
| 196 | |
| 197 | result = g_malloc(len + strlen(filename) + 1); |
| 198 | memcpy(result, base_path, len); |
| 199 | strcpy(result + len, filename); |
| 200 | |
| 201 | return result; |
| 202 | } |
| 203 | |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 204 | /* |
| 205 | * Helper function for bdrv_parse_filename() implementations to remove optional |
| 206 | * protocol prefixes (especially "file:") from a filename and for putting the |
| 207 | * stripped filename into the options QDict if there is such a prefix. |
| 208 | */ |
| 209 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
| 210 | QDict *options) |
| 211 | { |
| 212 | if (strstart(filename, prefix, &filename)) { |
| 213 | /* Stripping the explicit protocol prefix may result in a protocol |
| 214 | * prefix being (wrongly) detected (if the filename contains a colon) */ |
| 215 | if (path_has_protocol(filename)) { |
| 216 | QString *fat_filename; |
| 217 | |
| 218 | /* This means there is some colon before the first slash; therefore, |
| 219 | * this cannot be an absolute path */ |
| 220 | assert(!path_is_absolute(filename)); |
| 221 | |
| 222 | /* And we can thus fix the protocol detection issue by prefixing it |
| 223 | * by "./" */ |
| 224 | fat_filename = qstring_from_str("./"); |
| 225 | qstring_append(fat_filename, filename); |
| 226 | |
| 227 | assert(!path_has_protocol(qstring_get_str(fat_filename))); |
| 228 | |
| 229 | qdict_put(options, "filename", fat_filename); |
| 230 | } else { |
| 231 | /* If no protocol prefix was detected, we can use the shortened |
| 232 | * filename as-is */ |
| 233 | qdict_put_str(options, "filename", filename); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 239 | /* Returns whether the image file is opened as read-only. Note that this can |
| 240 | * return false and writing to the image file is still not possible because the |
| 241 | * image is inactivated. */ |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 242 | bool bdrv_is_read_only(BlockDriverState *bs) |
| 243 | { |
| 244 | return bs->read_only; |
| 245 | } |
| 246 | |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 247 | int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| 248 | bool ignore_allow_rdw, Error **errp) |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 249 | { |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 250 | /* Do not set read_only if copy_on_read is enabled */ |
| 251 | if (bs->copy_on_read && read_only) { |
| 252 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", |
| 253 | bdrv_get_device_or_node_name(bs)); |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 257 | /* Do not clear read_only if it is prohibited */ |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 258 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 259 | !ignore_allow_rdw) |
| 260 | { |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 261 | error_setg(errp, "Node '%s' is read only", |
| 262 | bdrv_get_device_or_node_name(bs)); |
| 263 | return -EPERM; |
| 264 | } |
| 265 | |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 269 | /* |
| 270 | * Called by a driver that can only provide a read-only image. |
| 271 | * |
| 272 | * Returns 0 if the node is already read-only or it could switch the node to |
| 273 | * read-only because BDRV_O_AUTO_RDONLY is set. |
| 274 | * |
| 275 | * Returns -EACCES if the node is read-write and BDRV_O_AUTO_RDONLY is not set |
| 276 | * or bdrv_can_set_read_only() forbids making the node read-only. If @errmsg |
| 277 | * is not NULL, it is used as the error message for the Error object. |
| 278 | */ |
| 279 | int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, |
| 280 | Error **errp) |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 281 | { |
| 282 | int ret = 0; |
| 283 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 284 | if (!(bs->open_flags & BDRV_O_RDWR)) { |
| 285 | return 0; |
| 286 | } |
| 287 | if (!(bs->open_flags & BDRV_O_AUTO_RDONLY)) { |
| 288 | goto fail; |
| 289 | } |
| 290 | |
| 291 | ret = bdrv_can_set_read_only(bs, true, false, NULL); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 292 | if (ret < 0) { |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 293 | goto fail; |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 294 | } |
| 295 | |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 296 | bs->read_only = true; |
| 297 | bs->open_flags &= ~BDRV_O_RDWR; |
Kevin Wolf | eeae6a5 | 2018-10-09 16:57:12 +0200 | [diff] [blame] | 298 | |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 299 | return 0; |
Kevin Wolf | eaa2410 | 2018-10-12 11:27:41 +0200 | [diff] [blame] | 300 | |
| 301 | fail: |
| 302 | error_setg(errp, "%s", errmsg ?: "Image is read-only"); |
| 303 | return -EACCES; |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 304 | } |
| 305 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 306 | /* |
| 307 | * If @backing is empty, this function returns NULL without setting |
| 308 | * @errp. In all other cases, NULL will only be returned with @errp |
| 309 | * set. |
| 310 | * |
| 311 | * Therefore, a return value of NULL without @errp set means that |
| 312 | * there is no backing file; if @errp is set, there is one but its |
| 313 | * absolute filename cannot be generated. |
| 314 | */ |
| 315 | char *bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 316 | const char *backing, |
| 317 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 318 | { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 319 | if (backing[0] == '\0') { |
| 320 | return NULL; |
| 321 | } else if (path_has_protocol(backing) || path_is_absolute(backing)) { |
| 322 | return g_strdup(backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 323 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 324 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 325 | backed); |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 326 | return NULL; |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 327 | } else { |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 328 | return path_combine(backed, backing); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 329 | } |
| 330 | } |
| 331 | |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 332 | /* |
| 333 | * If @filename is empty or NULL, this function returns NULL without |
| 334 | * setting @errp. In all other cases, NULL will only be returned with |
| 335 | * @errp set. |
| 336 | */ |
| 337 | static char *bdrv_make_absolute_filename(BlockDriverState *relative_to, |
| 338 | const char *filename, Error **errp) |
| 339 | { |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 340 | char *dir, *full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 341 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 342 | if (!filename || filename[0] == '\0') { |
| 343 | return NULL; |
| 344 | } else if (path_has_protocol(filename) || path_is_absolute(filename)) { |
| 345 | return g_strdup(filename); |
| 346 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 347 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 348 | dir = bdrv_dirname(relative_to, errp); |
| 349 | if (!dir) { |
| 350 | return NULL; |
| 351 | } |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 352 | |
Max Reitz | 8df6861 | 2019-02-01 20:29:23 +0100 | [diff] [blame] | 353 | full_name = g_strconcat(dir, filename, NULL); |
| 354 | g_free(dir); |
| 355 | return full_name; |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 356 | } |
| 357 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 358 | char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 359 | { |
Max Reitz | 9f4793d | 2019-02-01 20:29:16 +0100 | [diff] [blame] | 360 | return bdrv_make_absolute_filename(bs, bs->backing_file, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 361 | } |
| 362 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 363 | void bdrv_register(BlockDriver *bdrv) |
| 364 | { |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 365 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 366 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 367 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 368 | BlockDriverState *bdrv_new(void) |
| 369 | { |
| 370 | BlockDriverState *bs; |
| 371 | int i; |
| 372 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 373 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 374 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 375 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 376 | QLIST_INIT(&bs->op_blockers[i]); |
| 377 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 378 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Paolo Bonzini | 3783fa3 | 2017-06-05 14:39:02 +0200 | [diff] [blame] | 379 | qemu_co_mutex_init(&bs->reqs_lock); |
Paolo Bonzini | 2119882 | 2017-06-05 14:39:03 +0200 | [diff] [blame] | 380 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 381 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 382 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 383 | |
Evgeny Yakovlev | 3ff2f67 | 2016-07-18 22:39:52 +0300 | [diff] [blame] | 384 | qemu_co_queue_init(&bs->flush_queue); |
| 385 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 386 | for (i = 0; i < bdrv_drain_all_count; i++) { |
| 387 | bdrv_drained_begin(bs); |
| 388 | } |
| 389 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 390 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 391 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 392 | return bs; |
| 393 | } |
| 394 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 395 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 396 | { |
| 397 | BlockDriver *drv1; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 398 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 399 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 400 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 401 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 402 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 403 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 404 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 405 | return NULL; |
| 406 | } |
| 407 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 408 | BlockDriver *bdrv_find_format(const char *format_name) |
| 409 | { |
| 410 | BlockDriver *drv1; |
| 411 | int i; |
| 412 | |
| 413 | drv1 = bdrv_do_find_format(format_name); |
| 414 | if (drv1) { |
| 415 | return drv1; |
| 416 | } |
| 417 | |
| 418 | /* The driver isn't registered, maybe we need to load a module */ |
| 419 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 420 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { |
| 421 | block_module_load_one(block_driver_modules[i].library_name); |
| 422 | break; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | return bdrv_do_find_format(format_name); |
| 427 | } |
| 428 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 429 | static int bdrv_format_is_whitelisted(const char *format_name, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 430 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 431 | static const char *whitelist_rw[] = { |
| 432 | CONFIG_BDRV_RW_WHITELIST |
| 433 | }; |
| 434 | static const char *whitelist_ro[] = { |
| 435 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 436 | }; |
| 437 | const char **p; |
| 438 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 439 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 440 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 441 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 442 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 443 | for (p = whitelist_rw; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 444 | if (!strcmp(format_name, *p)) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 445 | return 1; |
| 446 | } |
| 447 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 448 | if (read_only) { |
| 449 | for (p = whitelist_ro; *p; p++) { |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 450 | if (!strcmp(format_name, *p)) { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 451 | return 1; |
| 452 | } |
| 453 | } |
| 454 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 455 | return 0; |
| 456 | } |
| 457 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 458 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
| 459 | { |
| 460 | return bdrv_format_is_whitelisted(drv->format_name, read_only); |
| 461 | } |
| 462 | |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 463 | bool bdrv_uses_whitelist(void) |
| 464 | { |
| 465 | return use_bdrv_whitelist; |
| 466 | } |
| 467 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 468 | typedef struct CreateCo { |
| 469 | BlockDriver *drv; |
| 470 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 471 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 472 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 473 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 474 | } CreateCo; |
| 475 | |
| 476 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 477 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 478 | Error *local_err = NULL; |
| 479 | int ret; |
| 480 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 481 | CreateCo *cco = opaque; |
| 482 | assert(cco->drv); |
| 483 | |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 484 | ret = cco->drv->bdrv_co_create_opts(cco->filename, cco->opts, &local_err); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 485 | error_propagate(&cco->err, local_err); |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 486 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 487 | } |
| 488 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 489 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 490 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 491 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 492 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 493 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 494 | Coroutine *co; |
| 495 | CreateCo cco = { |
| 496 | .drv = drv, |
| 497 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 498 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 499 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 500 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 501 | }; |
| 502 | |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 503 | if (!drv->bdrv_co_create_opts) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 504 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 505 | ret = -ENOTSUP; |
| 506 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | if (qemu_in_coroutine()) { |
| 510 | /* Fast-path if already in coroutine context */ |
| 511 | bdrv_create_co_entry(&cco); |
| 512 | } else { |
Paolo Bonzini | 0b8b875 | 2016-07-04 19:10:01 +0200 | [diff] [blame] | 513 | co = qemu_coroutine_create(bdrv_create_co_entry, &cco); |
| 514 | qemu_coroutine_enter(co); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 515 | while (cco.ret == NOT_DONE) { |
Paolo Bonzini | b47ec2c | 2014-07-07 15:18:01 +0200 | [diff] [blame] | 516 | aio_poll(qemu_get_aio_context(), true); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 517 | } |
| 518 | } |
| 519 | |
| 520 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 521 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 522 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 523 | error_propagate(errp, cco.err); |
| 524 | } else { |
| 525 | error_setg_errno(errp, -ret, "Could not create image"); |
| 526 | } |
| 527 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 528 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 529 | out: |
| 530 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 531 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 532 | } |
| 533 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 534 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 535 | { |
| 536 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 537 | Error *local_err = NULL; |
| 538 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 539 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 540 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 541 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 542 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 543 | } |
| 544 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 545 | ret = bdrv_create(drv, filename, opts, &local_err); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 546 | error_propagate(errp, local_err); |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 547 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 548 | } |
| 549 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 550 | /** |
| 551 | * Try to get @bs's logical and physical block size. |
| 552 | * On success, store them in @bsz struct and return 0. |
| 553 | * On failure return -errno. |
| 554 | * @bs must not be empty. |
| 555 | */ |
| 556 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 557 | { |
| 558 | BlockDriver *drv = bs->drv; |
| 559 | |
| 560 | if (drv && drv->bdrv_probe_blocksizes) { |
| 561 | return drv->bdrv_probe_blocksizes(bs, bsz); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 562 | } else if (drv && drv->is_filter && bs->file) { |
| 563 | return bdrv_probe_blocksizes(bs->file->bs, bsz); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | return -ENOTSUP; |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 571 | * On success, store them in @geo struct and return 0. |
| 572 | * On failure return -errno. |
| 573 | * @bs must not be empty. |
| 574 | */ |
| 575 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 576 | { |
| 577 | BlockDriver *drv = bs->drv; |
| 578 | |
| 579 | if (drv && drv->bdrv_probe_geometry) { |
| 580 | return drv->bdrv_probe_geometry(bs, geo); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 581 | } else if (drv && drv->is_filter && bs->file) { |
| 582 | return bdrv_probe_geometry(bs->file->bs, geo); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 583 | } |
| 584 | |
| 585 | return -ENOTSUP; |
| 586 | } |
| 587 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 588 | /* |
| 589 | * Create a uniquely-named empty temporary file. |
| 590 | * Return 0 upon success, otherwise a negative errno value. |
| 591 | */ |
| 592 | int get_tmp_filename(char *filename, int size) |
| 593 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 594 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 595 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 596 | /* GetTempFileName requires that its output buffer (4th param) |
| 597 | have length MAX_PATH or greater. */ |
| 598 | assert(size >= MAX_PATH); |
| 599 | return (GetTempPath(MAX_PATH, temp_dir) |
| 600 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 601 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 602 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 603 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 604 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 605 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 606 | if (!tmpdir) { |
| 607 | tmpdir = "/var/tmp"; |
| 608 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 609 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 610 | return -EOVERFLOW; |
| 611 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 612 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 613 | if (fd < 0) { |
| 614 | return -errno; |
| 615 | } |
| 616 | if (close(fd) != 0) { |
| 617 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 618 | return -errno; |
| 619 | } |
| 620 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 621 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 622 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 623 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 624 | /* |
| 625 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 626 | * recognized as a host CDROM. |
| 627 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 628 | static BlockDriver *find_hdev_driver(const char *filename) |
| 629 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 630 | int score_max = 0, score; |
| 631 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 632 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 633 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 634 | if (d->bdrv_probe_device) { |
| 635 | score = d->bdrv_probe_device(filename); |
| 636 | if (score > score_max) { |
| 637 | score_max = score; |
| 638 | drv = d; |
| 639 | } |
| 640 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 641 | } |
| 642 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 643 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 644 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 645 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 646 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
| 647 | { |
| 648 | BlockDriver *drv1; |
| 649 | |
| 650 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 651 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { |
| 652 | return drv1; |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | return NULL; |
| 657 | } |
| 658 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 659 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 660 | bool allow_protocol_prefix, |
| 661 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 662 | { |
| 663 | BlockDriver *drv1; |
| 664 | char protocol[128]; |
| 665 | int len; |
| 666 | const char *p; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 667 | int i; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 668 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 669 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 670 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 671 | /* |
| 672 | * XXX(hch): we really should not let host device detection |
| 673 | * override an explicit protocol specification, but moving this |
| 674 | * later breaks access to device names with colons in them. |
| 675 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 676 | * based Linux systems those actually are quite common. |
| 677 | */ |
| 678 | drv1 = find_hdev_driver(filename); |
| 679 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 680 | return drv1; |
| 681 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 682 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 683 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 684 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 685 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 686 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 687 | p = strchr(filename, ':'); |
| 688 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 689 | len = p - filename; |
| 690 | if (len > sizeof(protocol) - 1) |
| 691 | len = sizeof(protocol) - 1; |
| 692 | memcpy(protocol, filename, len); |
| 693 | protocol[len] = '\0'; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 694 | |
| 695 | drv1 = bdrv_do_find_protocol(protocol); |
| 696 | if (drv1) { |
| 697 | return drv1; |
| 698 | } |
| 699 | |
| 700 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 701 | if (block_driver_modules[i].protocol_name && |
| 702 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { |
| 703 | block_module_load_one(block_driver_modules[i].library_name); |
| 704 | break; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 705 | } |
| 706 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 707 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 708 | drv1 = bdrv_do_find_protocol(protocol); |
| 709 | if (!drv1) { |
| 710 | error_setg(errp, "Unknown protocol '%s'", protocol); |
| 711 | } |
| 712 | return drv1; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 713 | } |
| 714 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 715 | /* |
| 716 | * Guess image format by probing its contents. |
| 717 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 718 | * we do it anyway for backward compatibility. |
| 719 | * |
| 720 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 721 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 722 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 723 | * @filename is its filename. |
| 724 | * |
| 725 | * For all block drivers, call the bdrv_probe() method to get its |
| 726 | * probing score. |
| 727 | * Return the first block driver with the highest probing score. |
| 728 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 729 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 730 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 731 | { |
| 732 | int score_max = 0, score; |
| 733 | BlockDriver *drv = NULL, *d; |
| 734 | |
| 735 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 736 | if (d->bdrv_probe) { |
| 737 | score = d->bdrv_probe(buf, buf_size, filename); |
| 738 | if (score > score_max) { |
| 739 | score_max = score; |
| 740 | drv = d; |
| 741 | } |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | return drv; |
| 746 | } |
| 747 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 748 | static int find_image_format(BlockBackend *file, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 749 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 750 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 751 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 752 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 753 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 754 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 755 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 756 | if (blk_is_sg(file) || !blk_is_inserted(file) || blk_getlength(file) == 0) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 757 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 758 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 759 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 760 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 761 | ret = blk_pread(file, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 762 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 763 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 764 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 765 | *pdrv = NULL; |
| 766 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 767 | } |
| 768 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 769 | drv = bdrv_probe_all(buf, ret, filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 770 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 771 | error_setg(errp, "Could not determine image format: No compatible " |
| 772 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 773 | ret = -ENOENT; |
| 774 | } |
| 775 | *pdrv = drv; |
| 776 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 777 | } |
| 778 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 779 | /** |
| 780 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 781 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 782 | */ |
Kevin Wolf | 3d9f2d2 | 2018-06-26 13:55:20 +0200 | [diff] [blame] | 783 | int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 784 | { |
| 785 | BlockDriver *drv = bs->drv; |
| 786 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 787 | if (!drv) { |
| 788 | return -ENOMEDIUM; |
| 789 | } |
| 790 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 791 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 792 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 793 | return 0; |
| 794 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 795 | /* query actual device if possible, otherwise just trust the hint */ |
| 796 | if (drv->bdrv_getlength) { |
| 797 | int64_t length = drv->bdrv_getlength(bs); |
| 798 | if (length < 0) { |
| 799 | return length; |
| 800 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 801 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | bs->total_sectors = hint; |
| 805 | return 0; |
| 806 | } |
| 807 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 808 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 809 | * Combines a QDict of new block driver @options with any missing options taken |
| 810 | * from @old_options, so that leaving out an option defaults to its old value. |
| 811 | */ |
| 812 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 813 | QDict *old_options) |
| 814 | { |
| 815 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 816 | bs->drv->bdrv_join_options(options, old_options); |
| 817 | } else { |
| 818 | qdict_join(options, old_options, false); |
| 819 | } |
| 820 | } |
| 821 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 822 | static BlockdevDetectZeroesOptions bdrv_parse_detect_zeroes(QemuOpts *opts, |
| 823 | int open_flags, |
| 824 | Error **errp) |
| 825 | { |
| 826 | Error *local_err = NULL; |
| 827 | char *value = qemu_opt_get_del(opts, "detect-zeroes"); |
| 828 | BlockdevDetectZeroesOptions detect_zeroes = |
| 829 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, value, |
| 830 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, &local_err); |
| 831 | g_free(value); |
| 832 | if (local_err) { |
| 833 | error_propagate(errp, local_err); |
| 834 | return detect_zeroes; |
| 835 | } |
| 836 | |
| 837 | if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| 838 | !(open_flags & BDRV_O_UNMAP)) |
| 839 | { |
| 840 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " |
| 841 | "without setting discard operation to unmap"); |
| 842 | } |
| 843 | |
| 844 | return detect_zeroes; |
| 845 | } |
| 846 | |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 847 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 848 | * Set open flags for a given discard mode |
| 849 | * |
| 850 | * Return 0 on success, -1 if the discard mode was invalid. |
| 851 | */ |
| 852 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 853 | { |
| 854 | *flags &= ~BDRV_O_UNMAP; |
| 855 | |
| 856 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 857 | /* do nothing */ |
| 858 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 859 | *flags |= BDRV_O_UNMAP; |
| 860 | } else { |
| 861 | return -1; |
| 862 | } |
| 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 868 | * Set open flags for a given cache mode |
| 869 | * |
| 870 | * Return 0 on success, -1 if the cache mode was invalid. |
| 871 | */ |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 872 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 873 | { |
| 874 | *flags &= ~BDRV_O_CACHE_MASK; |
| 875 | |
| 876 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 877 | *writethrough = false; |
| 878 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 879 | } else if (!strcmp(mode, "directsync")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 880 | *writethrough = true; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 881 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 882 | } else if (!strcmp(mode, "writeback")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 883 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 884 | } else if (!strcmp(mode, "unsafe")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 885 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 886 | *flags |= BDRV_O_NO_FLUSH; |
| 887 | } else if (!strcmp(mode, "writethrough")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 888 | *writethrough = true; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 889 | } else { |
| 890 | return -1; |
| 891 | } |
| 892 | |
| 893 | return 0; |
| 894 | } |
| 895 | |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 896 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
| 897 | { |
| 898 | BlockDriverState *parent = c->opaque; |
| 899 | return g_strdup(bdrv_get_device_or_node_name(parent)); |
| 900 | } |
| 901 | |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 902 | static void bdrv_child_cb_drained_begin(BdrvChild *child) |
| 903 | { |
| 904 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 6cd5c9d | 2018-05-29 17:17:45 +0200 | [diff] [blame] | 905 | bdrv_do_drained_begin_quiesce(bs, NULL, false); |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 906 | } |
| 907 | |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 908 | static bool bdrv_child_cb_drained_poll(BdrvChild *child) |
| 909 | { |
| 910 | BlockDriverState *bs = child->opaque; |
Kevin Wolf | 6cd5c9d | 2018-05-29 17:17:45 +0200 | [diff] [blame] | 911 | return bdrv_drain_poll(bs, false, NULL, false); |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 912 | } |
| 913 | |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 914 | static void bdrv_child_cb_drained_end(BdrvChild *child) |
| 915 | { |
| 916 | BlockDriverState *bs = child->opaque; |
| 917 | bdrv_drained_end(bs); |
| 918 | } |
| 919 | |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 920 | static void bdrv_child_cb_attach(BdrvChild *child) |
| 921 | { |
| 922 | BlockDriverState *bs = child->opaque; |
| 923 | bdrv_apply_subtree_drain(child, bs); |
| 924 | } |
| 925 | |
| 926 | static void bdrv_child_cb_detach(BdrvChild *child) |
| 927 | { |
| 928 | BlockDriverState *bs = child->opaque; |
| 929 | bdrv_unapply_subtree_drain(child, bs); |
| 930 | } |
| 931 | |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 932 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
| 933 | { |
| 934 | BlockDriverState *bs = child->opaque; |
| 935 | assert(bs->open_flags & BDRV_O_INACTIVE); |
| 936 | return 0; |
| 937 | } |
| 938 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 939 | /* |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 940 | * Returns the options and flags that a temporary snapshot should get, based on |
| 941 | * the originally requested flags (the originally requested image will have |
| 942 | * flags like a backing file) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 943 | */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 944 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
| 945 | int parent_flags, QDict *parent_options) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 946 | { |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 947 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 948 | |
| 949 | /* For temporary files, unconditional cache=unsafe is fine */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 950 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
| 951 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 952 | |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 953 | /* Copy the read-only option from the parent */ |
| 954 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 955 | |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 956 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
| 957 | * temporary snapshot */ |
| 958 | *child_flags &= ~BDRV_O_NATIVE_AIO; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 959 | } |
| 960 | |
| 961 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 962 | * Returns the options and flags that bs->file should get if a protocol driver |
| 963 | * is expected, based on the given options and flags for the parent BDS |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 964 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 965 | static void bdrv_inherited_options(int *child_flags, QDict *child_options, |
| 966 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 967 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 968 | int flags = parent_flags; |
| 969 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 970 | /* Enable protocol handling, disable format probing for bs->file */ |
| 971 | flags |= BDRV_O_PROTOCOL; |
| 972 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 973 | /* If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 974 | * the parent. */ |
| 975 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 976 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 977 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 978 | |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 979 | /* Inherit the read-only option from the parent if it's not set */ |
| 980 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 981 | qdict_copy_default(child_options, parent_options, BDRV_OPT_AUTO_READ_ONLY); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 982 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 983 | /* Our block drivers take care to send flushes and respect unmap policy, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 984 | * so we can default to enable both on lower layers regardless of the |
| 985 | * corresponding parent options. */ |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 986 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 987 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 988 | /* Clear flags that only apply to the top layer */ |
Daniel P. Berrange | abb06c5 | 2016-03-21 14:11:42 +0000 | [diff] [blame] | 989 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ | |
| 990 | BDRV_O_NO_IO); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 991 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 992 | *child_flags = flags; |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 993 | } |
| 994 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 995 | const BdrvChildRole child_file = { |
Kevin Wolf | 6cd5c9d | 2018-05-29 17:17:45 +0200 | [diff] [blame] | 996 | .parent_is_bds = true, |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 997 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 998 | .inherit_options = bdrv_inherited_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 999 | .drained_begin = bdrv_child_cb_drained_begin, |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1000 | .drained_poll = bdrv_child_cb_drained_poll, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1001 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1002 | .attach = bdrv_child_cb_attach, |
| 1003 | .detach = bdrv_child_cb_detach, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1004 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1005 | }; |
| 1006 | |
| 1007 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1008 | * Returns the options and flags that bs->file should get if the use of formats |
| 1009 | * (and not only protocols) is permitted for it, based on the given options and |
| 1010 | * flags for the parent BDS |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1011 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1012 | static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options, |
| 1013 | int parent_flags, QDict *parent_options) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1014 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1015 | child_file.inherit_options(child_flags, child_options, |
| 1016 | parent_flags, parent_options); |
| 1017 | |
Daniel P. Berrange | abb06c5 | 2016-03-21 14:11:42 +0000 | [diff] [blame] | 1018 | *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | const BdrvChildRole child_format = { |
Kevin Wolf | 6cd5c9d | 2018-05-29 17:17:45 +0200 | [diff] [blame] | 1022 | .parent_is_bds = true, |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1023 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1024 | .inherit_options = bdrv_inherited_fmt_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1025 | .drained_begin = bdrv_child_cb_drained_begin, |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1026 | .drained_poll = bdrv_child_cb_drained_poll, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1027 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1028 | .attach = bdrv_child_cb_attach, |
| 1029 | .detach = bdrv_child_cb_detach, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1030 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1031 | }; |
| 1032 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1033 | static void bdrv_backing_attach(BdrvChild *c) |
| 1034 | { |
| 1035 | BlockDriverState *parent = c->opaque; |
| 1036 | BlockDriverState *backing_hd = c->bs; |
| 1037 | |
| 1038 | assert(!parent->backing_blocker); |
| 1039 | error_setg(&parent->backing_blocker, |
| 1040 | "node is used as backing hd of '%s'", |
| 1041 | bdrv_get_device_or_node_name(parent)); |
| 1042 | |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1043 | bdrv_refresh_filename(backing_hd); |
| 1044 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1045 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
| 1046 | pstrcpy(parent->backing_file, sizeof(parent->backing_file), |
| 1047 | backing_hd->filename); |
| 1048 | pstrcpy(parent->backing_format, sizeof(parent->backing_format), |
| 1049 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
| 1050 | |
| 1051 | bdrv_op_block_all(backing_hd, parent->backing_blocker); |
| 1052 | /* Otherwise we won't be able to commit or stream */ |
| 1053 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
| 1054 | parent->backing_blocker); |
| 1055 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, |
| 1056 | parent->backing_blocker); |
| 1057 | /* |
| 1058 | * We do backup in 3 ways: |
| 1059 | * 1. drive backup |
| 1060 | * The target bs is new opened, and the source is top BDS |
| 1061 | * 2. blockdev backup |
| 1062 | * Both the source and the target are top BDSes. |
| 1063 | * 3. internal backup(used for block replication) |
| 1064 | * Both the source and the target are backing file |
| 1065 | * |
| 1066 | * In case 1 and 2, neither the source nor the target is the backing file. |
| 1067 | * In case 3, we will block the top BDS, so there is only one block job |
| 1068 | * for the top BDS and its backing chain. |
| 1069 | */ |
| 1070 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, |
| 1071 | parent->backing_blocker); |
| 1072 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, |
| 1073 | parent->backing_blocker); |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1074 | |
| 1075 | bdrv_child_cb_attach(c); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1076 | } |
| 1077 | |
| 1078 | static void bdrv_backing_detach(BdrvChild *c) |
| 1079 | { |
| 1080 | BlockDriverState *parent = c->opaque; |
| 1081 | |
| 1082 | assert(parent->backing_blocker); |
| 1083 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); |
| 1084 | error_free(parent->backing_blocker); |
| 1085 | parent->backing_blocker = NULL; |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 1086 | |
| 1087 | bdrv_child_cb_detach(c); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1088 | } |
| 1089 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1090 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1091 | * Returns the options and flags that bs->backing should get, based on the |
| 1092 | * given options and flags for the parent BDS |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1093 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1094 | static void bdrv_backing_options(int *child_flags, QDict *child_options, |
| 1095 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1096 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1097 | int flags = parent_flags; |
| 1098 | |
Kevin Wolf | b8816a4 | 2016-03-04 14:52:32 +0100 | [diff] [blame] | 1099 | /* The cache mode is inherited unmodified for backing files; except WCE, |
| 1100 | * which is only applied on the top level (BlockBackend) */ |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1101 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 1102 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1103 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1104 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1105 | /* backing files always opened read-only */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1106 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1107 | qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off"); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1108 | flags &= ~BDRV_O_COPY_ON_READ; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1109 | |
| 1110 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1111 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1112 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1113 | *child_flags = flags; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1114 | } |
| 1115 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1116 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
| 1117 | const char *filename, Error **errp) |
| 1118 | { |
| 1119 | BlockDriverState *parent = c->opaque; |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1120 | bool read_only = bdrv_is_read_only(parent); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1121 | int ret; |
| 1122 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1123 | if (read_only) { |
| 1124 | ret = bdrv_reopen_set_read_only(parent, false, errp); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1125 | if (ret < 0) { |
| 1126 | return ret; |
| 1127 | } |
| 1128 | } |
| 1129 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1130 | ret = bdrv_change_backing_file(parent, filename, |
| 1131 | base->drv ? base->drv->format_name : ""); |
| 1132 | if (ret < 0) { |
Kevin Wolf | 6473069 | 2017-11-06 17:52:58 +0100 | [diff] [blame] | 1133 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1134 | } |
| 1135 | |
Alberto Garcia | e94d3db | 2018-11-12 16:00:34 +0200 | [diff] [blame] | 1136 | if (read_only) { |
| 1137 | bdrv_reopen_set_read_only(parent, true, NULL); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1138 | } |
| 1139 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1140 | return ret; |
| 1141 | } |
| 1142 | |
Kevin Wolf | 91ef382 | 2016-12-20 16:23:46 +0100 | [diff] [blame] | 1143 | const BdrvChildRole child_backing = { |
Kevin Wolf | 6cd5c9d | 2018-05-29 17:17:45 +0200 | [diff] [blame] | 1144 | .parent_is_bds = true, |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1145 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1146 | .attach = bdrv_backing_attach, |
| 1147 | .detach = bdrv_backing_detach, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1148 | .inherit_options = bdrv_backing_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1149 | .drained_begin = bdrv_child_cb_drained_begin, |
Kevin Wolf | 89bd030 | 2018-03-22 14:11:20 +0100 | [diff] [blame] | 1150 | .drained_poll = bdrv_child_cb_drained_poll, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1151 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1152 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1153 | .update_filename = bdrv_backing_update_filename, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1154 | }; |
| 1155 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1156 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 1157 | { |
Kevin Wolf | 61de4c6 | 2016-03-18 17:46:45 +0100 | [diff] [blame] | 1158 | int open_flags = flags; |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1159 | |
| 1160 | /* |
| 1161 | * Clear flags that are internal to the block layer before opening the |
| 1162 | * image. |
| 1163 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 1164 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1165 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1166 | return open_flags; |
| 1167 | } |
| 1168 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1169 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 1170 | { |
Alberto Garcia | 2a3d433 | 2018-11-12 16:00:48 +0200 | [diff] [blame] | 1171 | *flags &= ~(BDRV_O_CACHE_MASK | BDRV_O_RDWR | BDRV_O_AUTO_RDONLY); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1172 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1173 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1174 | *flags |= BDRV_O_NO_FLUSH; |
| 1175 | } |
| 1176 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1177 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1178 | *flags |= BDRV_O_NOCACHE; |
| 1179 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1180 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 1181 | if (!qemu_opt_get_bool_del(opts, BDRV_OPT_READ_ONLY, false)) { |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1182 | *flags |= BDRV_O_RDWR; |
| 1183 | } |
| 1184 | |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1185 | if (qemu_opt_get_bool_del(opts, BDRV_OPT_AUTO_READ_ONLY, false)) { |
| 1186 | *flags |= BDRV_O_AUTO_RDONLY; |
| 1187 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1188 | } |
| 1189 | |
| 1190 | static void update_options_from_flags(QDict *options, int flags) |
| 1191 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1192 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1193 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1194 | } |
| 1195 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1196 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 1197 | flags & BDRV_O_NO_FLUSH); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1198 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1199 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1200 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1201 | } |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1202 | if (!qdict_haskey(options, BDRV_OPT_AUTO_READ_ONLY)) { |
| 1203 | qdict_put_bool(options, BDRV_OPT_AUTO_READ_ONLY, |
| 1204 | flags & BDRV_O_AUTO_RDONLY); |
| 1205 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1206 | } |
| 1207 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1208 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 1209 | const char *node_name, |
| 1210 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1211 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1212 | char *gen_node_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1213 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1214 | if (!node_name) { |
| 1215 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 1216 | } else if (!id_wellformed(node_name)) { |
| 1217 | /* |
| 1218 | * Check for empty string or invalid characters, but not if it is |
| 1219 | * generated (generated names use characters not available to the user) |
| 1220 | */ |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 1221 | error_setg(errp, "Invalid node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1222 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1223 | } |
| 1224 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1225 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 1226 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1227 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 1228 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1229 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1230 | } |
| 1231 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1232 | /* takes care of avoiding duplicates node names */ |
| 1233 | if (bdrv_find_node(node_name)) { |
| 1234 | error_setg(errp, "Duplicate node name"); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1235 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1236 | } |
| 1237 | |
Kevin Wolf | 824808d | 2018-07-04 13:28:29 +0200 | [diff] [blame] | 1238 | /* Make sure that the node name isn't truncated */ |
| 1239 | if (strlen(node_name) >= sizeof(bs->node_name)) { |
| 1240 | error_setg(errp, "Node name too long"); |
| 1241 | goto out; |
| 1242 | } |
| 1243 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1244 | /* copy node name into the bs and insert it into the graph list */ |
| 1245 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 1246 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1247 | out: |
| 1248 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1249 | } |
| 1250 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1251 | static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, |
| 1252 | const char *node_name, QDict *options, |
| 1253 | int open_flags, Error **errp) |
| 1254 | { |
| 1255 | Error *local_err = NULL; |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1256 | int i, ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1257 | |
| 1258 | bdrv_assign_node_name(bs, node_name, &local_err); |
| 1259 | if (local_err) { |
| 1260 | error_propagate(errp, local_err); |
| 1261 | return -EINVAL; |
| 1262 | } |
| 1263 | |
| 1264 | bs->drv = drv; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1265 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1266 | bs->opaque = g_malloc0(drv->instance_size); |
| 1267 | |
| 1268 | if (drv->bdrv_file_open) { |
| 1269 | assert(!drv->bdrv_needs_filename || bs->filename[0]); |
| 1270 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1271 | } else if (drv->bdrv_open) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1272 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1273 | } else { |
| 1274 | ret = 0; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | if (ret < 0) { |
| 1278 | if (local_err) { |
| 1279 | error_propagate(errp, local_err); |
| 1280 | } else if (bs->filename[0]) { |
| 1281 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
| 1282 | } else { |
| 1283 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1284 | } |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1285 | goto open_failed; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1286 | } |
| 1287 | |
| 1288 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 1289 | if (ret < 0) { |
| 1290 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1291 | return ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1292 | } |
| 1293 | |
| 1294 | bdrv_refresh_limits(bs, &local_err); |
| 1295 | if (local_err) { |
| 1296 | error_propagate(errp, local_err); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1297 | return -EINVAL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1298 | } |
| 1299 | |
| 1300 | assert(bdrv_opt_mem_align(bs) != 0); |
| 1301 | assert(bdrv_min_mem_align(bs) != 0); |
| 1302 | assert(is_power_of_2(bs->bl.request_alignment)); |
| 1303 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 1304 | for (i = 0; i < bs->quiesce_counter; i++) { |
| 1305 | if (drv->bdrv_co_drain_begin) { |
| 1306 | drv->bdrv_co_drain_begin(bs); |
| 1307 | } |
| 1308 | } |
| 1309 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1310 | return 0; |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1311 | open_failed: |
| 1312 | bs->drv = NULL; |
| 1313 | if (bs->file != NULL) { |
| 1314 | bdrv_unref_child(bs, bs->file); |
| 1315 | bs->file = NULL; |
| 1316 | } |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1317 | g_free(bs->opaque); |
| 1318 | bs->opaque = NULL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1319 | return ret; |
| 1320 | } |
| 1321 | |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1322 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| 1323 | int flags, Error **errp) |
| 1324 | { |
| 1325 | BlockDriverState *bs; |
| 1326 | int ret; |
| 1327 | |
| 1328 | bs = bdrv_new(); |
| 1329 | bs->open_flags = flags; |
| 1330 | bs->explicit_options = qdict_new(); |
| 1331 | bs->options = qdict_new(); |
| 1332 | bs->opaque = NULL; |
| 1333 | |
| 1334 | update_options_from_flags(bs->options, flags); |
| 1335 | |
| 1336 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); |
| 1337 | if (ret < 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1338 | qobject_unref(bs->explicit_options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1339 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1340 | qobject_unref(bs->options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1341 | bs->options = NULL; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1342 | bdrv_unref(bs); |
| 1343 | return NULL; |
| 1344 | } |
| 1345 | |
| 1346 | return bs; |
| 1347 | } |
| 1348 | |
Kevin Wolf | c5f3014 | 2016-10-06 11:33:17 +0200 | [diff] [blame] | 1349 | QemuOptsList bdrv_runtime_opts = { |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1350 | .name = "bdrv_common", |
| 1351 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 1352 | .desc = { |
| 1353 | { |
| 1354 | .name = "node-name", |
| 1355 | .type = QEMU_OPT_STRING, |
| 1356 | .help = "Node name of the block device node", |
| 1357 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1358 | { |
| 1359 | .name = "driver", |
| 1360 | .type = QEMU_OPT_STRING, |
| 1361 | .help = "Block driver to use for the node", |
| 1362 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1363 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1364 | .name = BDRV_OPT_CACHE_DIRECT, |
| 1365 | .type = QEMU_OPT_BOOL, |
| 1366 | .help = "Bypass software writeback cache on the host", |
| 1367 | }, |
| 1368 | { |
| 1369 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 1370 | .type = QEMU_OPT_BOOL, |
| 1371 | .help = "Ignore flush requests", |
| 1372 | }, |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1373 | { |
| 1374 | .name = BDRV_OPT_READ_ONLY, |
| 1375 | .type = QEMU_OPT_BOOL, |
| 1376 | .help = "Node is opened in read-only mode", |
| 1377 | }, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1378 | { |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 1379 | .name = BDRV_OPT_AUTO_READ_ONLY, |
| 1380 | .type = QEMU_OPT_BOOL, |
| 1381 | .help = "Node can become read-only if opening read-write fails", |
| 1382 | }, |
| 1383 | { |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1384 | .name = "detect-zeroes", |
| 1385 | .type = QEMU_OPT_STRING, |
| 1386 | .help = "try to optimize zero writes (off, on, unmap)", |
| 1387 | }, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1388 | { |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1389 | .name = BDRV_OPT_DISCARD, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1390 | .type = QEMU_OPT_STRING, |
| 1391 | .help = "discard operation (ignore/off, unmap/on)", |
| 1392 | }, |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1393 | { |
| 1394 | .name = BDRV_OPT_FORCE_SHARE, |
| 1395 | .type = QEMU_OPT_BOOL, |
| 1396 | .help = "always accept other writers (default: off)", |
| 1397 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1398 | { /* end of list */ } |
| 1399 | }, |
| 1400 | }; |
| 1401 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1402 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1403 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1404 | * |
| 1405 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1406 | */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1407 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1408 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1409 | { |
| 1410 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 1411 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1412 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1413 | const char *node_name = NULL; |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1414 | const char *discard; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1415 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1416 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1417 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1418 | |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1419 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 1420 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1421 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1422 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 1423 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 1424 | if (local_err) { |
| 1425 | error_propagate(errp, local_err); |
| 1426 | ret = -EINVAL; |
| 1427 | goto fail_opts; |
| 1428 | } |
| 1429 | |
Alberto Garcia | 9b7e869 | 2016-09-15 17:53:01 +0300 | [diff] [blame] | 1430 | update_flags_from_options(&bs->open_flags, opts); |
| 1431 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1432 | driver_name = qemu_opt_get(opts, "driver"); |
| 1433 | drv = bdrv_find_format(driver_name); |
| 1434 | assert(drv != NULL); |
| 1435 | |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1436 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
| 1437 | |
| 1438 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { |
| 1439 | error_setg(errp, |
| 1440 | BDRV_OPT_FORCE_SHARE |
| 1441 | "=on can only be used with read-only images"); |
| 1442 | ret = -EINVAL; |
| 1443 | goto fail_opts; |
| 1444 | } |
| 1445 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1446 | if (file != NULL) { |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 1447 | bdrv_refresh_filename(blk_bs(file)); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1448 | filename = blk_bs(file)->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1449 | } else { |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1450 | /* |
| 1451 | * Caution: while qdict_get_try_str() is fine, getting |
| 1452 | * non-string types would require more care. When @options |
| 1453 | * come from -blockdev or blockdev_add, its members are typed |
| 1454 | * according to the QAPI schema, but when they come from |
| 1455 | * -drive, they're all QString. |
| 1456 | */ |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1457 | filename = qdict_get_try_str(options, "filename"); |
| 1458 | } |
| 1459 | |
Max Reitz | 4a00824 | 2017-04-13 18:06:24 +0200 | [diff] [blame] | 1460 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 1461 | error_setg(errp, "The '%s' block driver requires a file name", |
| 1462 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1463 | ret = -EINVAL; |
| 1464 | goto fail_opts; |
| 1465 | } |
| 1466 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1467 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 1468 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1469 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1470 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1471 | |
| 1472 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8be25de | 2019-01-22 13:15:31 +0100 | [diff] [blame] | 1473 | if (!bs->read_only && bdrv_is_whitelisted(drv, true)) { |
| 1474 | ret = bdrv_apply_auto_read_only(bs, NULL, NULL); |
| 1475 | } else { |
| 1476 | ret = -ENOTSUP; |
| 1477 | } |
| 1478 | if (ret < 0) { |
| 1479 | error_setg(errp, |
| 1480 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 1481 | ? "Driver '%s' can only be used for read-only devices" |
| 1482 | : "Driver '%s' is not whitelisted", |
| 1483 | drv->format_name); |
| 1484 | goto fail_opts; |
| 1485 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1486 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1487 | |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1488 | /* bdrv_new() and bdrv_close() make it so */ |
| 1489 | assert(atomic_read(&bs->copy_on_read) == 0); |
| 1490 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1491 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1492 | if (!bs->read_only) { |
| 1493 | bdrv_enable_copy_on_read(bs); |
| 1494 | } else { |
| 1495 | error_setg(errp, "Can't use copy-on-read on read-only device"); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1496 | ret = -EINVAL; |
| 1497 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1498 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1499 | } |
| 1500 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 1501 | discard = qemu_opt_get(opts, BDRV_OPT_DISCARD); |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1502 | if (discard != NULL) { |
| 1503 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { |
| 1504 | error_setg(errp, "Invalid discard option"); |
| 1505 | ret = -EINVAL; |
| 1506 | goto fail_opts; |
| 1507 | } |
| 1508 | } |
| 1509 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 1510 | bs->detect_zeroes = |
| 1511 | bdrv_parse_detect_zeroes(opts, bs->open_flags, &local_err); |
| 1512 | if (local_err) { |
| 1513 | error_propagate(errp, local_err); |
| 1514 | ret = -EINVAL; |
| 1515 | goto fail_opts; |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1516 | } |
| 1517 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 1518 | if (filename != NULL) { |
| 1519 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 1520 | } else { |
| 1521 | bs->filename[0] = '\0'; |
| 1522 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1523 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1524 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1525 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1526 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1527 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1528 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1529 | assert(!drv->bdrv_file_open || file == NULL); |
| 1530 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1531 | if (ret < 0) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1532 | goto fail_opts; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1533 | } |
| 1534 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1535 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1536 | return 0; |
| 1537 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1538 | fail_opts: |
| 1539 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1540 | return ret; |
| 1541 | } |
| 1542 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1543 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1544 | { |
| 1545 | QObject *options_obj; |
| 1546 | QDict *options; |
| 1547 | int ret; |
| 1548 | |
| 1549 | ret = strstart(filename, "json:", &filename); |
| 1550 | assert(ret); |
| 1551 | |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1552 | options_obj = qobject_from_json(filename, errp); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1553 | if (!options_obj) { |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1554 | error_prepend(errp, "Could not parse the JSON options: "); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1555 | return NULL; |
| 1556 | } |
| 1557 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 1558 | options = qobject_to(QDict, options_obj); |
Markus Armbruster | ca6b6e1 | 2017-02-17 21:38:18 +0100 | [diff] [blame] | 1559 | if (!options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1560 | qobject_unref(options_obj); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1561 | error_setg(errp, "Invalid JSON object given"); |
| 1562 | return NULL; |
| 1563 | } |
| 1564 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1565 | qdict_flatten(options); |
| 1566 | |
| 1567 | return options; |
| 1568 | } |
| 1569 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1570 | static void parse_json_protocol(QDict *options, const char **pfilename, |
| 1571 | Error **errp) |
| 1572 | { |
| 1573 | QDict *json_options; |
| 1574 | Error *local_err = NULL; |
| 1575 | |
| 1576 | /* Parse json: pseudo-protocol */ |
| 1577 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { |
| 1578 | return; |
| 1579 | } |
| 1580 | |
| 1581 | json_options = parse_json_filename(*pfilename, &local_err); |
| 1582 | if (local_err) { |
| 1583 | error_propagate(errp, local_err); |
| 1584 | return; |
| 1585 | } |
| 1586 | |
| 1587 | /* Options given in the filename have lower priority than options |
| 1588 | * specified directly */ |
| 1589 | qdict_join(options, json_options, false); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1590 | qobject_unref(json_options); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1591 | *pfilename = NULL; |
| 1592 | } |
| 1593 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1594 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1595 | * Fills in default options for opening images and converts the legacy |
| 1596 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1597 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 1598 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1599 | */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1600 | static int bdrv_fill_options(QDict **options, const char *filename, |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1601 | int *flags, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1602 | { |
| 1603 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1604 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1605 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1606 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1607 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1608 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1609 | /* |
| 1610 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 1611 | * types would require more care. When @options come from |
| 1612 | * -blockdev or blockdev_add, its members are typed according to |
| 1613 | * the QAPI schema, but when they come from -drive, they're all |
| 1614 | * QString. |
| 1615 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1616 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1617 | if (drvname) { |
| 1618 | drv = bdrv_find_format(drvname); |
| 1619 | if (!drv) { |
| 1620 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1621 | return -ENOENT; |
| 1622 | } |
| 1623 | /* If the user has explicitly specified the driver, this choice should |
| 1624 | * override the BDRV_O_PROTOCOL flag */ |
| 1625 | protocol = drv->bdrv_file_open; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1626 | } |
| 1627 | |
| 1628 | if (protocol) { |
| 1629 | *flags |= BDRV_O_PROTOCOL; |
| 1630 | } else { |
| 1631 | *flags &= ~BDRV_O_PROTOCOL; |
| 1632 | } |
| 1633 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1634 | /* Translate cache options from flags into options */ |
| 1635 | update_options_from_flags(*options, *flags); |
| 1636 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1637 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1638 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1639 | if (!qdict_haskey(*options, "filename")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1640 | qdict_put_str(*options, "filename", filename); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1641 | parse_filename = true; |
| 1642 | } else { |
| 1643 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1644 | "the same time"); |
| 1645 | return -EINVAL; |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | /* Find the right block driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1650 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1651 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1652 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1653 | if (!drvname && protocol) { |
| 1654 | if (filename) { |
| 1655 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 1656 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1657 | return -EINVAL; |
| 1658 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1659 | |
| 1660 | drvname = drv->format_name; |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1661 | qdict_put_str(*options, "driver", drvname); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1662 | } else { |
| 1663 | error_setg(errp, "Must specify either driver or file"); |
| 1664 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1665 | } |
| 1666 | } |
| 1667 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1668 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1669 | |
| 1670 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1671 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1672 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1673 | if (local_err) { |
| 1674 | error_propagate(errp, local_err); |
| 1675 | return -EINVAL; |
| 1676 | } |
| 1677 | |
| 1678 | if (!drv->bdrv_needs_filename) { |
| 1679 | qdict_del(*options, "filename"); |
| 1680 | } |
| 1681 | } |
| 1682 | |
| 1683 | return 0; |
| 1684 | } |
| 1685 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1686 | static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q, |
| 1687 | uint64_t perm, uint64_t shared, |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1688 | GSList *ignore_children, Error **errp); |
| 1689 | static void bdrv_child_abort_perm_update(BdrvChild *c); |
| 1690 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared); |
| 1691 | |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1692 | typedef struct BlockReopenQueueEntry { |
| 1693 | bool prepared; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 1694 | bool perms_checked; |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1695 | BDRVReopenState state; |
| 1696 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1697 | } BlockReopenQueueEntry; |
| 1698 | |
| 1699 | /* |
| 1700 | * Return the flags that @bs will have after the reopens in @q have |
| 1701 | * successfully completed. If @q is NULL (or @bs is not contained in @q), |
| 1702 | * return the current flags. |
| 1703 | */ |
| 1704 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) |
| 1705 | { |
| 1706 | BlockReopenQueueEntry *entry; |
| 1707 | |
| 1708 | if (q != NULL) { |
| 1709 | QSIMPLEQ_FOREACH(entry, q, entry) { |
| 1710 | if (entry->state.bs == bs) { |
| 1711 | return entry->state.flags; |
| 1712 | } |
| 1713 | } |
| 1714 | } |
| 1715 | |
| 1716 | return bs->open_flags; |
| 1717 | } |
| 1718 | |
| 1719 | /* Returns whether the image file can be written to after the reopen queue @q |
| 1720 | * has been successfully applied, or right now if @q is NULL. */ |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 1721 | static bool bdrv_is_writable_after_reopen(BlockDriverState *bs, |
| 1722 | BlockReopenQueue *q) |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1723 | { |
| 1724 | int flags = bdrv_reopen_get_flags(q, bs); |
| 1725 | |
| 1726 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; |
| 1727 | } |
| 1728 | |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 1729 | /* |
| 1730 | * Return whether the BDS can be written to. This is not necessarily |
| 1731 | * the same as !bdrv_is_read_only(bs), as inactivated images may not |
| 1732 | * be written to but do not count as read-only images. |
| 1733 | */ |
| 1734 | bool bdrv_is_writable(BlockDriverState *bs) |
| 1735 | { |
| 1736 | return bdrv_is_writable_after_reopen(bs, NULL); |
| 1737 | } |
| 1738 | |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1739 | static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1740 | BdrvChild *c, const BdrvChildRole *role, |
| 1741 | BlockReopenQueue *reopen_queue, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1742 | uint64_t parent_perm, uint64_t parent_shared, |
| 1743 | uint64_t *nperm, uint64_t *nshared) |
| 1744 | { |
| 1745 | if (bs->drv && bs->drv->bdrv_child_perm) { |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1746 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1747 | parent_perm, parent_shared, |
| 1748 | nperm, nshared); |
| 1749 | } |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1750 | /* TODO Take force_share from reopen_queue */ |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1751 | if (child_bs && child_bs->force_share) { |
| 1752 | *nshared = BLK_PERM_ALL; |
| 1753 | } |
| 1754 | } |
| 1755 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1756 | /* |
| 1757 | * Check whether permissions on this node can be changed in a way that |
| 1758 | * @cumulative_perms and @cumulative_shared_perms are the new cumulative |
| 1759 | * permissions of all its parents. This involves checking whether all necessary |
| 1760 | * permission changes to child nodes can be performed. |
| 1761 | * |
| 1762 | * A call to this function must always be followed by a call to bdrv_set_perm() |
| 1763 | * or bdrv_abort_perm_update(). |
| 1764 | */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1765 | static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 1766 | uint64_t cumulative_perms, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1767 | uint64_t cumulative_shared_perms, |
| 1768 | GSList *ignore_children, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1769 | { |
| 1770 | BlockDriver *drv = bs->drv; |
| 1771 | BdrvChild *c; |
| 1772 | int ret; |
| 1773 | |
| 1774 | /* Write permissions never work with read-only images */ |
| 1775 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 1776 | !bdrv_is_writable_after_reopen(bs, q)) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1777 | { |
| 1778 | error_setg(errp, "Block node is read-only"); |
| 1779 | return -EPERM; |
| 1780 | } |
| 1781 | |
| 1782 | /* Check this node */ |
| 1783 | if (!drv) { |
| 1784 | return 0; |
| 1785 | } |
| 1786 | |
| 1787 | if (drv->bdrv_check_perm) { |
| 1788 | return drv->bdrv_check_perm(bs, cumulative_perms, |
| 1789 | cumulative_shared_perms, errp); |
| 1790 | } |
| 1791 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1792 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1793 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1794 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1795 | return 0; |
| 1796 | } |
| 1797 | |
| 1798 | /* Check all children */ |
| 1799 | QLIST_FOREACH(c, &bs->children, next) { |
| 1800 | uint64_t cur_perm, cur_shared; |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1801 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1802 | cumulative_perms, cumulative_shared_perms, |
| 1803 | &cur_perm, &cur_shared); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1804 | ret = bdrv_child_check_perm(c, q, cur_perm, cur_shared, |
| 1805 | ignore_children, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1806 | if (ret < 0) { |
| 1807 | return ret; |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | return 0; |
| 1812 | } |
| 1813 | |
| 1814 | /* |
| 1815 | * Notifies drivers that after a previous bdrv_check_perm() call, the |
| 1816 | * permission update is not performed and any preparations made for it (e.g. |
| 1817 | * taken file locks) need to be undone. |
| 1818 | * |
| 1819 | * This function recursively notifies all child nodes. |
| 1820 | */ |
| 1821 | static void bdrv_abort_perm_update(BlockDriverState *bs) |
| 1822 | { |
| 1823 | BlockDriver *drv = bs->drv; |
| 1824 | BdrvChild *c; |
| 1825 | |
| 1826 | if (!drv) { |
| 1827 | return; |
| 1828 | } |
| 1829 | |
| 1830 | if (drv->bdrv_abort_perm_update) { |
| 1831 | drv->bdrv_abort_perm_update(bs); |
| 1832 | } |
| 1833 | |
| 1834 | QLIST_FOREACH(c, &bs->children, next) { |
| 1835 | bdrv_child_abort_perm_update(c); |
| 1836 | } |
| 1837 | } |
| 1838 | |
| 1839 | static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms, |
| 1840 | uint64_t cumulative_shared_perms) |
| 1841 | { |
| 1842 | BlockDriver *drv = bs->drv; |
| 1843 | BdrvChild *c; |
| 1844 | |
| 1845 | if (!drv) { |
| 1846 | return; |
| 1847 | } |
| 1848 | |
| 1849 | /* Update this node */ |
| 1850 | if (drv->bdrv_set_perm) { |
| 1851 | drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); |
| 1852 | } |
| 1853 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1854 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1855 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1856 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1857 | return; |
| 1858 | } |
| 1859 | |
| 1860 | /* Update all children */ |
| 1861 | QLIST_FOREACH(c, &bs->children, next) { |
| 1862 | uint64_t cur_perm, cur_shared; |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1863 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1864 | cumulative_perms, cumulative_shared_perms, |
| 1865 | &cur_perm, &cur_shared); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1866 | bdrv_child_set_perm(c, cur_perm, cur_shared); |
| 1867 | } |
| 1868 | } |
| 1869 | |
| 1870 | static void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
| 1871 | uint64_t *shared_perm) |
| 1872 | { |
| 1873 | BdrvChild *c; |
| 1874 | uint64_t cumulative_perms = 0; |
| 1875 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 1876 | |
| 1877 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 1878 | cumulative_perms |= c->perm; |
| 1879 | cumulative_shared_perms &= c->shared_perm; |
| 1880 | } |
| 1881 | |
| 1882 | *perm = cumulative_perms; |
| 1883 | *shared_perm = cumulative_shared_perms; |
| 1884 | } |
| 1885 | |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1886 | static char *bdrv_child_user_desc(BdrvChild *c) |
| 1887 | { |
| 1888 | if (c->role->get_parent_desc) { |
| 1889 | return c->role->get_parent_desc(c); |
| 1890 | } |
| 1891 | |
| 1892 | return g_strdup("another user"); |
| 1893 | } |
| 1894 | |
Fam Zheng | 5176196 | 2017-05-03 00:35:36 +0800 | [diff] [blame] | 1895 | char *bdrv_perm_names(uint64_t perm) |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1896 | { |
| 1897 | struct perm_name { |
| 1898 | uint64_t perm; |
| 1899 | const char *name; |
| 1900 | } permissions[] = { |
| 1901 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, |
| 1902 | { BLK_PERM_WRITE, "write" }, |
| 1903 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, |
| 1904 | { BLK_PERM_RESIZE, "resize" }, |
| 1905 | { BLK_PERM_GRAPH_MOD, "change children" }, |
| 1906 | { 0, NULL } |
| 1907 | }; |
| 1908 | |
| 1909 | char *result = g_strdup(""); |
| 1910 | struct perm_name *p; |
| 1911 | |
| 1912 | for (p = permissions; p->name; p++) { |
| 1913 | if (perm & p->perm) { |
| 1914 | char *old = result; |
| 1915 | result = g_strdup_printf("%s%s%s", old, *old ? ", " : "", p->name); |
| 1916 | g_free(old); |
| 1917 | } |
| 1918 | } |
| 1919 | |
| 1920 | return result; |
| 1921 | } |
| 1922 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1923 | /* |
| 1924 | * Checks whether a new reference to @bs can be added if the new user requires |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1925 | * @new_used_perm/@new_shared_perm as its permissions. If @ignore_children is |
| 1926 | * set, the BdrvChild objects in this list are ignored in the calculations; |
| 1927 | * this allows checking permission updates for an existing reference. |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1928 | * |
| 1929 | * Needs to be followed by a call to either bdrv_set_perm() or |
| 1930 | * bdrv_abort_perm_update(). */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1931 | static int bdrv_check_update_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 1932 | uint64_t new_used_perm, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1933 | uint64_t new_shared_perm, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1934 | GSList *ignore_children, Error **errp) |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1935 | { |
| 1936 | BdrvChild *c; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1937 | uint64_t cumulative_perms = new_used_perm; |
| 1938 | uint64_t cumulative_shared_perms = new_shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1939 | |
| 1940 | /* There is no reason why anyone couldn't tolerate write_unchanged */ |
| 1941 | assert(new_shared_perm & BLK_PERM_WRITE_UNCHANGED); |
| 1942 | |
| 1943 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1944 | if (g_slist_find(ignore_children, c)) { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1945 | continue; |
| 1946 | } |
| 1947 | |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1948 | if ((new_used_perm & c->shared_perm) != new_used_perm) { |
| 1949 | char *user = bdrv_child_user_desc(c); |
| 1950 | char *perm_names = bdrv_perm_names(new_used_perm & ~c->shared_perm); |
| 1951 | error_setg(errp, "Conflicts with use by %s as '%s', which does not " |
| 1952 | "allow '%s' on %s", |
| 1953 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); |
| 1954 | g_free(user); |
| 1955 | g_free(perm_names); |
| 1956 | return -EPERM; |
| 1957 | } |
| 1958 | |
| 1959 | if ((c->perm & new_shared_perm) != c->perm) { |
| 1960 | char *user = bdrv_child_user_desc(c); |
| 1961 | char *perm_names = bdrv_perm_names(c->perm & ~new_shared_perm); |
| 1962 | error_setg(errp, "Conflicts with use by %s as '%s', which uses " |
| 1963 | "'%s' on %s", |
| 1964 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); |
| 1965 | g_free(user); |
| 1966 | g_free(perm_names); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1967 | return -EPERM; |
| 1968 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1969 | |
| 1970 | cumulative_perms |= c->perm; |
| 1971 | cumulative_shared_perms &= c->shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1972 | } |
| 1973 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1974 | return bdrv_check_perm(bs, q, cumulative_perms, cumulative_shared_perms, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1975 | ignore_children, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1976 | } |
| 1977 | |
| 1978 | /* Needs to be followed by a call to either bdrv_child_set_perm() or |
| 1979 | * bdrv_child_abort_perm_update(). */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1980 | static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q, |
| 1981 | uint64_t perm, uint64_t shared, |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1982 | GSList *ignore_children, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1983 | { |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1984 | int ret; |
| 1985 | |
| 1986 | ignore_children = g_slist_prepend(g_slist_copy(ignore_children), c); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1987 | ret = bdrv_check_update_perm(c->bs, q, perm, shared, ignore_children, errp); |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1988 | g_slist_free(ignore_children); |
| 1989 | |
Vladimir Sementsov-Ogievskiy | f962e96 | 2019-02-23 22:20:40 +0300 | [diff] [blame] | 1990 | if (ret < 0) { |
| 1991 | return ret; |
| 1992 | } |
| 1993 | |
| 1994 | if (!c->has_backup_perm) { |
| 1995 | c->has_backup_perm = true; |
| 1996 | c->backup_perm = c->perm; |
| 1997 | c->backup_shared_perm = c->shared_perm; |
| 1998 | } |
| 1999 | /* |
| 2000 | * Note: it's OK if c->has_backup_perm was already set, as we can find the |
| 2001 | * same child twice during check_perm procedure |
| 2002 | */ |
| 2003 | |
| 2004 | c->perm = perm; |
| 2005 | c->shared_perm = shared; |
| 2006 | |
| 2007 | return 0; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2008 | } |
| 2009 | |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 2010 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2011 | { |
| 2012 | uint64_t cumulative_perms, cumulative_shared_perms; |
| 2013 | |
Vladimir Sementsov-Ogievskiy | f962e96 | 2019-02-23 22:20:40 +0300 | [diff] [blame] | 2014 | c->has_backup_perm = false; |
| 2015 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2016 | c->perm = perm; |
| 2017 | c->shared_perm = shared; |
| 2018 | |
| 2019 | bdrv_get_cumulative_perm(c->bs, &cumulative_perms, |
| 2020 | &cumulative_shared_perms); |
| 2021 | bdrv_set_perm(c->bs, cumulative_perms, cumulative_shared_perms); |
| 2022 | } |
| 2023 | |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 2024 | static void bdrv_child_abort_perm_update(BdrvChild *c) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2025 | { |
Vladimir Sementsov-Ogievskiy | f962e96 | 2019-02-23 22:20:40 +0300 | [diff] [blame] | 2026 | if (c->has_backup_perm) { |
| 2027 | c->perm = c->backup_perm; |
| 2028 | c->shared_perm = c->backup_shared_perm; |
| 2029 | c->has_backup_perm = false; |
| 2030 | } |
| 2031 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2032 | bdrv_abort_perm_update(c->bs); |
| 2033 | } |
| 2034 | |
| 2035 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
| 2036 | Error **errp) |
| 2037 | { |
| 2038 | int ret; |
| 2039 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 2040 | ret = bdrv_child_check_perm(c, NULL, perm, shared, NULL, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2041 | if (ret < 0) { |
| 2042 | bdrv_child_abort_perm_update(c); |
| 2043 | return ret; |
| 2044 | } |
| 2045 | |
| 2046 | bdrv_child_set_perm(c, perm, shared); |
| 2047 | |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2048 | return 0; |
| 2049 | } |
| 2050 | |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2051 | void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, |
| 2052 | const BdrvChildRole *role, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2053 | BlockReopenQueue *reopen_queue, |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 2054 | uint64_t perm, uint64_t shared, |
| 2055 | uint64_t *nperm, uint64_t *nshared) |
| 2056 | { |
| 2057 | if (c == NULL) { |
| 2058 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
| 2059 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; |
| 2060 | return; |
| 2061 | } |
| 2062 | |
| 2063 | *nperm = (perm & DEFAULT_PERM_PASSTHROUGH) | |
| 2064 | (c->perm & DEFAULT_PERM_UNCHANGED); |
| 2065 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | |
| 2066 | (c->shared_perm & DEFAULT_PERM_UNCHANGED); |
| 2067 | } |
| 2068 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2069 | void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, |
| 2070 | const BdrvChildRole *role, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2071 | BlockReopenQueue *reopen_queue, |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2072 | uint64_t perm, uint64_t shared, |
| 2073 | uint64_t *nperm, uint64_t *nshared) |
| 2074 | { |
| 2075 | bool backing = (role == &child_backing); |
| 2076 | assert(role == &child_backing || role == &child_file); |
| 2077 | |
| 2078 | if (!backing) { |
Kevin Wolf | 5fbfabd | 2017-11-30 17:38:43 +0100 | [diff] [blame] | 2079 | int flags = bdrv_reopen_get_flags(reopen_queue, bs); |
| 2080 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2081 | /* Apart from the modifications below, the same permissions are |
| 2082 | * forwarded and left alone as for filters */ |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2083 | bdrv_filter_default_perms(bs, c, role, reopen_queue, perm, shared, |
| 2084 | &perm, &shared); |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2085 | |
| 2086 | /* Format drivers may touch metadata even if the guest doesn't write */ |
Max Reitz | cc02214 | 2018-06-06 21:37:00 +0200 | [diff] [blame] | 2087 | if (bdrv_is_writable_after_reopen(bs, reopen_queue)) { |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2088 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2089 | } |
| 2090 | |
| 2091 | /* bs->file always needs to be consistent because of the metadata. We |
| 2092 | * can never allow other users to resize or write to it. */ |
Kevin Wolf | 5fbfabd | 2017-11-30 17:38:43 +0100 | [diff] [blame] | 2093 | if (!(flags & BDRV_O_NO_IO)) { |
| 2094 | perm |= BLK_PERM_CONSISTENT_READ; |
| 2095 | } |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2096 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); |
| 2097 | } else { |
| 2098 | /* We want consistent read from backing files if the parent needs it. |
| 2099 | * No other operations are performed on backing files. */ |
| 2100 | perm &= BLK_PERM_CONSISTENT_READ; |
| 2101 | |
| 2102 | /* If the parent can deal with changing data, we're okay with a |
| 2103 | * writable and resizable backing file. */ |
| 2104 | /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */ |
| 2105 | if (shared & BLK_PERM_WRITE) { |
| 2106 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2107 | } else { |
| 2108 | shared = 0; |
| 2109 | } |
| 2110 | |
| 2111 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD | |
| 2112 | BLK_PERM_WRITE_UNCHANGED; |
| 2113 | } |
| 2114 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 2115 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 2116 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 2117 | } |
| 2118 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 2119 | *nperm = perm; |
| 2120 | *nshared = shared; |
| 2121 | } |
| 2122 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2123 | static void bdrv_replace_child_noperm(BdrvChild *child, |
| 2124 | BlockDriverState *new_bs) |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2125 | { |
| 2126 | BlockDriverState *old_bs = child->bs; |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 2127 | int i; |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2128 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2129 | assert(!child->frozen); |
| 2130 | |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2131 | if (old_bs && new_bs) { |
| 2132 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); |
| 2133 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2134 | if (old_bs) { |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2135 | /* Detach first so that the recursive drain sections coming from @child |
| 2136 | * are already gone and we only end the drain sections that came from |
| 2137 | * elsewhere. */ |
| 2138 | if (child->role->detach) { |
| 2139 | child->role->detach(child); |
| 2140 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2141 | if (old_bs->quiesce_counter && child->role->drained_end) { |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 2142 | int num = old_bs->quiesce_counter; |
| 2143 | if (child->role->parent_is_bds) { |
| 2144 | num -= bdrv_drain_all_count; |
| 2145 | } |
| 2146 | assert(num >= 0); |
| 2147 | for (i = 0; i < num; i++) { |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 2148 | child->role->drained_end(child); |
| 2149 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2150 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2151 | QLIST_REMOVE(child, next_parent); |
| 2152 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2153 | |
| 2154 | child->bs = new_bs; |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2155 | |
| 2156 | if (new_bs) { |
| 2157 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); |
| 2158 | if (new_bs->quiesce_counter && child->role->drained_begin) { |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 2159 | int num = new_bs->quiesce_counter; |
| 2160 | if (child->role->parent_is_bds) { |
| 2161 | num -= bdrv_drain_all_count; |
| 2162 | } |
| 2163 | assert(num >= 0); |
| 2164 | for (i = 0; i < num; i++) { |
Kevin Wolf | 4be6a6d | 2018-06-29 18:01:31 +0200 | [diff] [blame] | 2165 | bdrv_parent_drained_begin_single(child, true); |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 2166 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2167 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2168 | |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2169 | /* Attach only after starting new drained sections, so that recursive |
| 2170 | * drain sections coming from @child don't get an extra .drained_begin |
| 2171 | * callback. */ |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 2172 | if (child->role->attach) { |
| 2173 | child->role->attach(child); |
| 2174 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2175 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2176 | } |
| 2177 | |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2178 | /* |
| 2179 | * Updates @child to change its reference to point to @new_bs, including |
| 2180 | * checking and applying the necessary permisson updates both to the old node |
| 2181 | * and to @new_bs. |
| 2182 | * |
| 2183 | * NULL is passed as @new_bs for removing the reference before freeing @child. |
| 2184 | * |
| 2185 | * If @new_bs is not NULL, bdrv_check_perm() must be called beforehand, as this |
| 2186 | * function uses bdrv_set_perm() to update the permissions according to the new |
| 2187 | * reference that @new_bs gets. |
| 2188 | */ |
| 2189 | static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs) |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2190 | { |
| 2191 | BlockDriverState *old_bs = child->bs; |
| 2192 | uint64_t perm, shared_perm; |
| 2193 | |
Kevin Wolf | 8aecf1d | 2017-08-03 17:02:57 +0200 | [diff] [blame] | 2194 | bdrv_replace_child_noperm(child, new_bs); |
| 2195 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2196 | if (old_bs) { |
| 2197 | /* Update permissions for old node. This is guaranteed to succeed |
| 2198 | * because we're just taking a parent away, so we're loosening |
| 2199 | * restrictions. */ |
| 2200 | bdrv_get_cumulative_perm(old_bs, &perm, &shared_perm); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 2201 | bdrv_check_perm(old_bs, NULL, perm, shared_perm, NULL, &error_abort); |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2202 | bdrv_set_perm(old_bs, perm, shared_perm); |
| 2203 | } |
| 2204 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2205 | if (new_bs) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2206 | bdrv_get_cumulative_perm(new_bs, &perm, &shared_perm); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2207 | bdrv_set_perm(new_bs, perm, shared_perm); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2208 | } |
| 2209 | } |
| 2210 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2211 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
| 2212 | const char *child_name, |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2213 | const BdrvChildRole *child_role, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2214 | uint64_t perm, uint64_t shared_perm, |
| 2215 | void *opaque, Error **errp) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2216 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2217 | BdrvChild *child; |
| 2218 | int ret; |
| 2219 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 2220 | ret = bdrv_check_update_perm(child_bs, NULL, perm, shared_perm, NULL, errp); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2221 | if (ret < 0) { |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2222 | bdrv_abort_perm_update(child_bs); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2223 | return NULL; |
| 2224 | } |
| 2225 | |
| 2226 | child = g_new(BdrvChild, 1); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2227 | *child = (BdrvChild) { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2228 | .bs = NULL, |
| 2229 | .name = g_strdup(child_name), |
| 2230 | .role = child_role, |
| 2231 | .perm = perm, |
| 2232 | .shared_perm = shared_perm, |
| 2233 | .opaque = opaque, |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2234 | }; |
| 2235 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2236 | /* This performs the matching bdrv_set_perm() for the above check. */ |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2237 | bdrv_replace_child(child, child_bs); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2238 | |
| 2239 | return child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2240 | } |
| 2241 | |
Wen Congyang | 98292c6 | 2016-05-10 15:36:38 +0800 | [diff] [blame] | 2242 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 2243 | BlockDriverState *child_bs, |
| 2244 | const char *child_name, |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2245 | const BdrvChildRole *child_role, |
| 2246 | Error **errp) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2247 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2248 | BdrvChild *child; |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2249 | uint64_t perm, shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2250 | |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2251 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
| 2252 | |
| 2253 | assert(parent_bs->drv); |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2254 | assert(bdrv_get_aio_context(parent_bs) == bdrv_get_aio_context(child_bs)); |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 2255 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2256 | perm, shared_perm, &perm, &shared_perm); |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2257 | |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2258 | child = bdrv_root_attach_child(child_bs, child_name, child_role, |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2259 | perm, shared_perm, parent_bs, errp); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2260 | if (child == NULL) { |
| 2261 | return NULL; |
| 2262 | } |
| 2263 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2264 | QLIST_INSERT_HEAD(&parent_bs->children, child, next); |
| 2265 | return child; |
| 2266 | } |
| 2267 | |
Kevin Wolf | 3f09bfb | 2015-09-15 11:58:23 +0200 | [diff] [blame] | 2268 | static void bdrv_detach_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2269 | { |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2270 | if (child->next.le_prev) { |
| 2271 | QLIST_REMOVE(child, next); |
| 2272 | child->next.le_prev = NULL; |
| 2273 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2274 | |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2275 | bdrv_replace_child(child, NULL); |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2276 | |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 2277 | g_free(child->name); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2278 | g_free(child); |
| 2279 | } |
| 2280 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2281 | void bdrv_root_unref_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2282 | { |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 2283 | BlockDriverState *child_bs; |
| 2284 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2285 | child_bs = child->bs; |
| 2286 | bdrv_detach_child(child); |
| 2287 | bdrv_unref(child_bs); |
| 2288 | } |
| 2289 | |
| 2290 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 2291 | { |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 2292 | if (child == NULL) { |
| 2293 | return; |
| 2294 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2295 | |
| 2296 | if (child->bs->inherits_from == parent) { |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2297 | BdrvChild *c; |
| 2298 | |
| 2299 | /* Remove inherits_from only when the last reference between parent and |
| 2300 | * child->bs goes away. */ |
| 2301 | QLIST_FOREACH(c, &parent->children, next) { |
| 2302 | if (c != child && c->bs == child->bs) { |
| 2303 | break; |
| 2304 | } |
| 2305 | } |
| 2306 | if (c == NULL) { |
| 2307 | child->bs->inherits_from = NULL; |
| 2308 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2309 | } |
| 2310 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2311 | bdrv_root_unref_child(child); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2312 | } |
| 2313 | |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 2314 | |
| 2315 | static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) |
| 2316 | { |
| 2317 | BdrvChild *c; |
| 2318 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2319 | if (c->role->change_media) { |
| 2320 | c->role->change_media(c, load); |
| 2321 | } |
| 2322 | } |
| 2323 | } |
| 2324 | |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 2325 | /* Return true if you can reach parent going through child->inherits_from |
| 2326 | * recursively. If parent or child are NULL, return false */ |
| 2327 | static bool bdrv_inherits_from_recursive(BlockDriverState *child, |
| 2328 | BlockDriverState *parent) |
| 2329 | { |
| 2330 | while (child && child != parent) { |
| 2331 | child = child->inherits_from; |
| 2332 | } |
| 2333 | |
| 2334 | return child != NULL; |
| 2335 | } |
| 2336 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2337 | /* |
| 2338 | * Sets the backing file link of a BDS. A new reference is created; callers |
| 2339 | * which don't need their own reference any more must call bdrv_unref(). |
| 2340 | */ |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2341 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| 2342 | Error **errp) |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2343 | { |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 2344 | bool update_inherits_from = bdrv_chain_contains(bs, backing_hd) && |
| 2345 | bdrv_inherits_from_recursive(backing_hd, bs); |
| 2346 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 2347 | if (bdrv_is_backing_chain_frozen(bs, backing_bs(bs), errp)) { |
| 2348 | return; |
| 2349 | } |
| 2350 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2351 | if (backing_hd) { |
| 2352 | bdrv_ref(backing_hd); |
| 2353 | } |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2354 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2355 | if (bs->backing) { |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2356 | bdrv_unref_child(bs, bs->backing); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 2357 | } |
| 2358 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2359 | if (!backing_hd) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2360 | bs->backing = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2361 | goto out; |
| 2362 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2363 | |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2364 | bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing, |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2365 | errp); |
Alberto Garcia | 0065c45 | 2018-10-31 18:16:37 +0200 | [diff] [blame] | 2366 | /* If backing_hd was already part of bs's backing chain, and |
| 2367 | * inherits_from pointed recursively to bs then let's update it to |
| 2368 | * point directly to bs (else it will become NULL). */ |
| 2369 | if (update_inherits_from) { |
| 2370 | backing_hd->inherits_from = bs; |
| 2371 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2372 | if (!bs->backing) { |
| 2373 | bdrv_unref(backing_hd); |
| 2374 | } |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 2375 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2376 | out: |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 2377 | bdrv_refresh_limits(bs, NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2378 | } |
| 2379 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2380 | /* |
| 2381 | * Opens the backing file for a BlockDriverState if not yet open |
| 2382 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2383 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 2384 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 2385 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 2386 | * BlockdevRef. |
| 2387 | * |
| 2388 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2389 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2390 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 2391 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2392 | { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 2393 | char *backing_filename = NULL; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2394 | char *bdref_key_dot; |
| 2395 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 2396 | int ret = 0; |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 2397 | bool implicit_backing = false; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2398 | BlockDriverState *backing_hd; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2399 | QDict *options; |
| 2400 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 2401 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2402 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2403 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2404 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2405 | } |
| 2406 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2407 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2408 | if (parent_options == NULL) { |
| 2409 | tmp_parent_options = qdict_new(); |
| 2410 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2411 | } |
| 2412 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2413 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2414 | |
| 2415 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 2416 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 2417 | g_free(bdref_key_dot); |
| 2418 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2419 | /* |
| 2420 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2421 | * types would require more care. When @parent_options come from |
| 2422 | * -blockdev or blockdev_add, its members are typed according to |
| 2423 | * the QAPI schema, but when they come from -drive, they're all |
| 2424 | * QString. |
| 2425 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2426 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 2427 | if (reference || qdict_haskey(options, "file.filename")) { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 2428 | /* keep backing_filename NULL */ |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 2429 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2430 | qobject_unref(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2431 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 2432 | } else { |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 2433 | if (qdict_size(options) == 0) { |
| 2434 | /* If the user specifies options that do not modify the |
| 2435 | * backing file's behavior, we might still consider it the |
| 2436 | * implicit backing file. But it's easier this way, and |
| 2437 | * just specifying some of the backing BDS's options is |
| 2438 | * only possible with -drive anyway (otherwise the QAPI |
| 2439 | * schema forces the user to specify everything). */ |
| 2440 | implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file); |
| 2441 | } |
| 2442 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 2443 | backing_filename = bdrv_get_full_backing_filename(bs, &local_err); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 2444 | if (local_err) { |
| 2445 | ret = -EINVAL; |
| 2446 | error_propagate(errp, local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2447 | qobject_unref(options); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 2448 | goto free_exit; |
| 2449 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2450 | } |
| 2451 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 2452 | if (!bs->drv || !bs->drv->supports_backing) { |
| 2453 | ret = -EINVAL; |
| 2454 | error_setg(errp, "Driver doesn't support backing files"); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2455 | qobject_unref(options); |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 2456 | goto free_exit; |
| 2457 | } |
| 2458 | |
Peter Krempa | 6bff597 | 2017-10-12 16:14:10 +0200 | [diff] [blame] | 2459 | if (!reference && |
| 2460 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2461 | qdict_put_str(options, "driver", bs->backing_format); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2462 | } |
| 2463 | |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 2464 | backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs, |
| 2465 | &child_backing, errp); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2466 | if (!backing_hd) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2467 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2468 | error_prepend(errp, "Could not open backing file: "); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2469 | ret = -EINVAL; |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2470 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2471 | } |
sochin.jiang | 5ce6bfe | 2017-06-26 19:04:24 +0800 | [diff] [blame] | 2472 | bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs)); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2473 | |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 2474 | if (implicit_backing) { |
| 2475 | bdrv_refresh_filename(backing_hd); |
| 2476 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 2477 | backing_hd->filename); |
| 2478 | } |
| 2479 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2480 | /* Hook up the backing file link; drop our reference, bs owns the |
| 2481 | * backing_hd reference now */ |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2482 | bdrv_set_backing_hd(bs, backing_hd, &local_err); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2483 | bdrv_unref(backing_hd); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2484 | if (local_err) { |
Fam Zheng | 8cd1a3e | 2017-03-17 09:56:30 +0800 | [diff] [blame] | 2485 | error_propagate(errp, local_err); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2486 | ret = -EINVAL; |
| 2487 | goto free_exit; |
| 2488 | } |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 2489 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2490 | qdict_del(parent_options, bdref_key); |
| 2491 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2492 | free_exit: |
| 2493 | g_free(backing_filename); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2494 | qobject_unref(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2495 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2496 | } |
| 2497 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2498 | static BlockDriverState * |
| 2499 | bdrv_open_child_bs(const char *filename, QDict *options, const char *bdref_key, |
| 2500 | BlockDriverState *parent, const BdrvChildRole *child_role, |
| 2501 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2502 | { |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2503 | BlockDriverState *bs = NULL; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2504 | QDict *image_options; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2505 | char *bdref_key_dot; |
| 2506 | const char *reference; |
| 2507 | |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2508 | assert(child_role != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2509 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2510 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 2511 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 2512 | g_free(bdref_key_dot); |
| 2513 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2514 | /* |
| 2515 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2516 | * types would require more care. When @options come from |
| 2517 | * -blockdev or blockdev_add, its members are typed according to |
| 2518 | * the QAPI schema, but when they come from -drive, they're all |
| 2519 | * QString. |
| 2520 | */ |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2521 | reference = qdict_get_try_str(options, bdref_key); |
| 2522 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2523 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2524 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 2525 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2526 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2527 | qobject_unref(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2528 | goto done; |
| 2529 | } |
| 2530 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2531 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
| 2532 | parent, child_role, errp); |
| 2533 | if (!bs) { |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2534 | goto done; |
| 2535 | } |
| 2536 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2537 | done: |
| 2538 | qdict_del(options, bdref_key); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2539 | return bs; |
| 2540 | } |
| 2541 | |
| 2542 | /* |
| 2543 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 2544 | * device's options. |
| 2545 | * |
| 2546 | * If allow_none is true, no image will be opened if filename is false and no |
| 2547 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
| 2548 | * |
| 2549 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 2550 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 2551 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 2552 | * BlockdevRef. |
| 2553 | * |
| 2554 | * The BlockdevRef will be removed from the options QDict. |
| 2555 | */ |
| 2556 | BdrvChild *bdrv_open_child(const char *filename, |
| 2557 | QDict *options, const char *bdref_key, |
| 2558 | BlockDriverState *parent, |
| 2559 | const BdrvChildRole *child_role, |
| 2560 | bool allow_none, Error **errp) |
| 2561 | { |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2562 | BdrvChild *c; |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2563 | BlockDriverState *bs; |
| 2564 | |
| 2565 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_role, |
| 2566 | allow_none, errp); |
| 2567 | if (bs == NULL) { |
| 2568 | return NULL; |
| 2569 | } |
| 2570 | |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2571 | c = bdrv_attach_child(parent, bs, bdref_key, child_role, errp); |
| 2572 | if (!c) { |
| 2573 | bdrv_unref(bs); |
| 2574 | return NULL; |
| 2575 | } |
| 2576 | |
| 2577 | return c; |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2578 | } |
| 2579 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2580 | /* TODO Future callers may need to specify parent/child_role in order for |
| 2581 | * option inheritance to work. Existing callers use it for the root node. */ |
| 2582 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
| 2583 | { |
| 2584 | BlockDriverState *bs = NULL; |
| 2585 | Error *local_err = NULL; |
| 2586 | QObject *obj = NULL; |
| 2587 | QDict *qdict = NULL; |
| 2588 | const char *reference = NULL; |
| 2589 | Visitor *v = NULL; |
| 2590 | |
| 2591 | if (ref->type == QTYPE_QSTRING) { |
| 2592 | reference = ref->u.reference; |
| 2593 | } else { |
| 2594 | BlockdevOptions *options = &ref->u.definition; |
| 2595 | assert(ref->type == QTYPE_QDICT); |
| 2596 | |
| 2597 | v = qobject_output_visitor_new(&obj); |
| 2598 | visit_type_BlockdevOptions(v, NULL, &options, &local_err); |
| 2599 | if (local_err) { |
| 2600 | error_propagate(errp, local_err); |
| 2601 | goto fail; |
| 2602 | } |
| 2603 | visit_complete(v, &obj); |
| 2604 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 2605 | qdict = qobject_to(QDict, obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2606 | qdict_flatten(qdict); |
| 2607 | |
| 2608 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for |
| 2609 | * compatibility with other callers) rather than what we want as the |
| 2610 | * real defaults. Apply the defaults here instead. */ |
| 2611 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); |
| 2612 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| 2613 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); |
Kevin Wolf | e35bdc1 | 2018-10-05 18:57:40 +0200 | [diff] [blame] | 2614 | qdict_set_default_str(qdict, BDRV_OPT_AUTO_READ_ONLY, "off"); |
| 2615 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2616 | } |
| 2617 | |
| 2618 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, errp); |
| 2619 | obj = NULL; |
| 2620 | |
| 2621 | fail: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2622 | qobject_unref(obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2623 | visit_free(v); |
| 2624 | return bs; |
| 2625 | } |
| 2626 | |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2627 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
| 2628 | int flags, |
| 2629 | QDict *snapshot_options, |
| 2630 | Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2631 | { |
| 2632 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2633 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2634 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 2635 | QemuOpts *opts = NULL; |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2636 | BlockDriverState *bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2637 | Error *local_err = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2638 | int ret; |
| 2639 | |
| 2640 | /* if snapshot, we create a temporary backing file and open it |
| 2641 | instead of opening 'filename' directly */ |
| 2642 | |
| 2643 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 2644 | total_size = bdrv_getlength(bs); |
| 2645 | if (total_size < 0) { |
| 2646 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2647 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 2648 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2649 | |
| 2650 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2651 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2652 | if (ret < 0) { |
| 2653 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2654 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2655 | } |
| 2656 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 2657 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 2658 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 2659 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2660 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 2661 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2662 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2663 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 2664 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2665 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2666 | } |
| 2667 | |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2668 | /* Prepare options QDict for the temporary file */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2669 | qdict_put_str(snapshot_options, "file.driver", "file"); |
| 2670 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); |
| 2671 | qdict_put_str(snapshot_options, "driver", "qcow2"); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2672 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2673 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2674 | snapshot_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2675 | if (!bs_snapshot) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2676 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2677 | } |
| 2678 | |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2679 | /* bdrv_append() consumes a strong reference to bs_snapshot |
| 2680 | * (i.e. it will call bdrv_unref() on it) even on error, so in |
| 2681 | * order to be able to return one, we have to increase |
| 2682 | * bs_snapshot's refcount here */ |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2683 | bdrv_ref(bs_snapshot); |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2684 | bdrv_append(bs_snapshot, bs, &local_err); |
| 2685 | if (local_err) { |
| 2686 | error_propagate(errp, local_err); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2687 | bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2688 | goto out; |
| 2689 | } |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2690 | |
| 2691 | out: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2692 | qobject_unref(snapshot_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2693 | g_free(tmp_filename); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2694 | return bs_snapshot; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2695 | } |
| 2696 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2697 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2698 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2699 | * |
| 2700 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 2701 | * empty set of options. The reference to the QDict belongs to the block layer |
| 2702 | * after the call (even on failure), so if the caller intends to reuse the |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2703 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2704 | * |
| 2705 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 2706 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2707 | * |
| 2708 | * The reference parameter may be used to specify an existing block device which |
| 2709 | * should be opened. If specified, neither options nor a filename may be given, |
| 2710 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2711 | */ |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2712 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
| 2713 | const char *reference, |
| 2714 | QDict *options, int flags, |
| 2715 | BlockDriverState *parent, |
| 2716 | const BdrvChildRole *child_role, |
| 2717 | Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2718 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2719 | int ret; |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2720 | BlockBackend *file = NULL; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 2721 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 2722 | BlockDriver *drv = NULL; |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 2723 | BdrvChild *child; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 2724 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2725 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 2726 | Error *local_err = NULL; |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2727 | QDict *snapshot_options = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 2728 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 2729 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2730 | assert(!child_role || !flags); |
| 2731 | assert(!child_role == !parent); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2732 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2733 | if (reference) { |
| 2734 | bool options_non_empty = options ? qdict_size(options) : false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2735 | qobject_unref(options); |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2736 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2737 | if (filename || options_non_empty) { |
| 2738 | error_setg(errp, "Cannot reference an existing block device with " |
| 2739 | "additional options or a new filename"); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2740 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2741 | } |
| 2742 | |
| 2743 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 2744 | if (!bs) { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2745 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2746 | } |
Kevin Wolf | 76b2232 | 2016-04-04 17:11:13 +0200 | [diff] [blame] | 2747 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2748 | bdrv_ref(bs); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2749 | return bs; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2750 | } |
| 2751 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2752 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2753 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2754 | /* NULL means an empty set of options */ |
| 2755 | if (options == NULL) { |
| 2756 | options = qdict_new(); |
| 2757 | } |
| 2758 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2759 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2760 | parse_json_protocol(options, &filename, &local_err); |
| 2761 | if (local_err) { |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2762 | goto fail; |
| 2763 | } |
| 2764 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2765 | bs->explicit_options = qdict_clone_shallow(options); |
| 2766 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2767 | if (child_role) { |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 2768 | bs->inherits_from = parent; |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 2769 | child_role->inherit_options(&flags, options, |
| 2770 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2771 | } |
| 2772 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2773 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 2774 | if (local_err) { |
| 2775 | goto fail; |
| 2776 | } |
| 2777 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2778 | /* |
| 2779 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. |
| 2780 | * Caution: getting a boolean member of @options requires care. |
| 2781 | * When @options come from -blockdev or blockdev_add, members are |
| 2782 | * typed according to the QAPI schema, but when they come from |
| 2783 | * -drive, they're all QString. |
| 2784 | */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 2785 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
| 2786 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { |
| 2787 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); |
| 2788 | } else { |
| 2789 | flags &= ~BDRV_O_RDWR; |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 2790 | } |
| 2791 | |
| 2792 | if (flags & BDRV_O_SNAPSHOT) { |
| 2793 | snapshot_options = qdict_new(); |
| 2794 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, |
| 2795 | flags, options); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 2796 | /* Let bdrv_backing_options() override "read-only" */ |
| 2797 | qdict_del(options, BDRV_OPT_READ_ONLY); |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 2798 | bdrv_backing_options(&flags, options, flags, options); |
| 2799 | } |
| 2800 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 2801 | bs->open_flags = flags; |
| 2802 | bs->options = options; |
| 2803 | options = qdict_clone_shallow(options); |
| 2804 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2805 | /* Find the right image format driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2806 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2807 | drvname = qdict_get_try_str(options, "driver"); |
| 2808 | if (drvname) { |
| 2809 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2810 | if (!drv) { |
| 2811 | error_setg(errp, "Unknown driver: '%s'", drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2812 | goto fail; |
| 2813 | } |
| 2814 | } |
| 2815 | |
| 2816 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2817 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2818 | /* See cautionary note on accessing @options above */ |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2819 | backing = qdict_get_try_str(options, "backing"); |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 2820 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
| 2821 | (backing && *backing == '\0')) |
| 2822 | { |
Max Reitz | 4f7be28 | 2018-02-24 16:40:33 +0100 | [diff] [blame] | 2823 | if (backing) { |
| 2824 | warn_report("Use of \"backing\": \"\" is deprecated; " |
| 2825 | "use \"backing\": null instead"); |
| 2826 | } |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2827 | flags |= BDRV_O_NO_BACKING; |
| 2828 | qdict_del(options, "backing"); |
| 2829 | } |
| 2830 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2831 | /* Open image file without format layer. This BlockBackend is only used for |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2832 | * probing, the block drivers will do their own bdrv_open_child() for the |
| 2833 | * same BDS, which is why we put the node name back into options. */ |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 2834 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2835 | BlockDriverState *file_bs; |
| 2836 | |
| 2837 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, |
| 2838 | &child_file, true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 2839 | if (local_err) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 2840 | goto fail; |
| 2841 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2842 | if (file_bs != NULL) { |
Kevin Wolf | dacaa16 | 2017-11-20 14:59:13 +0100 | [diff] [blame] | 2843 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
| 2844 | * looking at the header to guess the image format. This works even |
| 2845 | * in cases where a guest would not see a consistent state. */ |
| 2846 | file = blk_new(0, BLK_PERM_ALL); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 2847 | blk_insert_bs(file, file_bs, &local_err); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2848 | bdrv_unref(file_bs); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 2849 | if (local_err) { |
| 2850 | goto fail; |
| 2851 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2852 | |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2853 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2854 | } |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 2855 | } |
| 2856 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2857 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 2858 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2859 | if (!drv && file) { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 2860 | ret = find_image_format(file, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2861 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2862 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 2863 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 2864 | /* |
| 2865 | * This option update would logically belong in bdrv_fill_options(), |
| 2866 | * but we first need to open bs->file for the probing to work, while |
| 2867 | * opening bs->file already requires the (mostly) final set of options |
| 2868 | * so that cache mode etc. can be inherited. |
| 2869 | * |
| 2870 | * Adding the driver later is somewhat ugly, but it's not an option |
| 2871 | * that would ever be inherited, so it's correct. We just need to make |
| 2872 | * sure to update both bs->options (which has the full effective |
| 2873 | * options for bs) and options (which has file.* already removed). |
| 2874 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2875 | qdict_put_str(bs->options, "driver", drv->format_name); |
| 2876 | qdict_put_str(options, "driver", drv->format_name); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2877 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2878 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2879 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 2880 | } |
| 2881 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2882 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 2883 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 2884 | /* file must be NULL if a protocol BDS is about to be created |
| 2885 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 2886 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 2887 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2888 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 2889 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2890 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2891 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 2892 | } |
| 2893 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2894 | if (file) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2895 | blk_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 2896 | file = NULL; |
| 2897 | } |
| 2898 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2899 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2900 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2901 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2902 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2903 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2904 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2905 | } |
| 2906 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 2907 | /* Remove all children options and references |
| 2908 | * from bs->options and bs->explicit_options */ |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 2909 | QLIST_FOREACH(child, &bs->children, next) { |
| 2910 | char *child_key_dot; |
| 2911 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 2912 | qdict_extract_subqdict(bs->explicit_options, NULL, child_key_dot); |
| 2913 | qdict_extract_subqdict(bs->options, NULL, child_key_dot); |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 2914 | qdict_del(bs->explicit_options, child->name); |
| 2915 | qdict_del(bs->options, child->name); |
Alberto Garcia | 2f624b8 | 2018-06-29 14:37:00 +0300 | [diff] [blame] | 2916 | g_free(child_key_dot); |
| 2917 | } |
| 2918 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2919 | /* Check if any unknown options were used */ |
Paolo Bonzini | 7ad2757 | 2017-01-04 15:59:14 +0100 | [diff] [blame] | 2920 | if (qdict_size(options) != 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2921 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 2922 | if (flags & BDRV_O_PROTOCOL) { |
| 2923 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 2924 | "'%s'", drv->format_name, entry->key); |
| 2925 | } else { |
Max Reitz | d0e46a5 | 2016-03-16 19:54:34 +0100 | [diff] [blame] | 2926 | error_setg(errp, |
| 2927 | "Block format '%s' does not support the option '%s'", |
| 2928 | drv->format_name, entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 2929 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2930 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2931 | goto close_and_fail; |
| 2932 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2933 | |
Daniel P. Berrange | c01c214 | 2017-06-23 17:24:16 +0100 | [diff] [blame] | 2934 | bdrv_parent_cb_change_media(bs, true); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2935 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2936 | qobject_unref(options); |
Alberto Garcia | 8961be3 | 2018-09-06 17:25:41 +0300 | [diff] [blame] | 2937 | options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2938 | |
| 2939 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 2940 | * temporary snapshot afterwards. */ |
| 2941 | if (snapshot_flags) { |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2942 | BlockDriverState *snapshot_bs; |
| 2943 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, |
| 2944 | snapshot_options, &local_err); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2945 | snapshot_options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2946 | if (local_err) { |
| 2947 | goto close_and_fail; |
| 2948 | } |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2949 | /* We are not going to return bs but the overlay on top of it |
| 2950 | * (snapshot_bs); thus, we have to drop the strong reference to bs |
| 2951 | * (which we obtained by calling bdrv_new()). bs will not be deleted, |
| 2952 | * though, because the overlay still has a reference to it. */ |
| 2953 | bdrv_unref(bs); |
| 2954 | bs = snapshot_bs; |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2955 | } |
| 2956 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2957 | return bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2958 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2959 | fail: |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2960 | blk_unref(file); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2961 | qobject_unref(snapshot_options); |
| 2962 | qobject_unref(bs->explicit_options); |
| 2963 | qobject_unref(bs->options); |
| 2964 | qobject_unref(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2965 | bs->options = NULL; |
Manos Pitsidianakis | 998cbd6 | 2017-07-14 17:35:47 +0300 | [diff] [blame] | 2966 | bs->explicit_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2967 | bdrv_unref(bs); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 2968 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2969 | return NULL; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2970 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2971 | close_and_fail: |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2972 | bdrv_unref(bs); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2973 | qobject_unref(snapshot_options); |
| 2974 | qobject_unref(options); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 2975 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2976 | return NULL; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2977 | } |
| 2978 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2979 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| 2980 | QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2981 | { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2982 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 2983 | NULL, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2984 | } |
| 2985 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2986 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 2987 | * Returns true if @child can be reached recursively from @bs |
| 2988 | */ |
| 2989 | static bool bdrv_recurse_has_child(BlockDriverState *bs, |
| 2990 | BlockDriverState *child) |
| 2991 | { |
| 2992 | BdrvChild *c; |
| 2993 | |
| 2994 | if (bs == child) { |
| 2995 | return true; |
| 2996 | } |
| 2997 | |
| 2998 | QLIST_FOREACH(c, &bs->children, next) { |
| 2999 | if (bdrv_recurse_has_child(c->bs, child)) { |
| 3000 | return true; |
| 3001 | } |
| 3002 | } |
| 3003 | |
| 3004 | return false; |
| 3005 | } |
| 3006 | |
| 3007 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3008 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 3009 | * reopen of multiple devices. |
| 3010 | * |
| 3011 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 3012 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 3013 | * be created and initialized. This newly created BlockReopenQueue should be |
| 3014 | * passed back in for subsequent calls that are intended to be of the same |
| 3015 | * atomic 'set'. |
| 3016 | * |
| 3017 | * bs is the BlockDriverState to add to the reopen queue. |
| 3018 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3019 | * options contains the changed options for the associated bs |
| 3020 | * (the BlockReopenQueue takes ownership) |
| 3021 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3022 | * flags contains the open flags for the associated bs |
| 3023 | * |
| 3024 | * returns a pointer to bs_queue, which is either the newly allocated |
| 3025 | * bs_queue, or the existing bs_queue being used. |
| 3026 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3027 | * bs must be drained between bdrv_reopen_queue() and bdrv_reopen_multiple(). |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3028 | */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3029 | static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, |
| 3030 | BlockDriverState *bs, |
| 3031 | QDict *options, |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3032 | const BdrvChildRole *role, |
| 3033 | QDict *parent_options, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3034 | int parent_flags, |
| 3035 | bool keep_old_opts) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3036 | { |
| 3037 | assert(bs != NULL); |
| 3038 | |
| 3039 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 3040 | BdrvChild *child; |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3041 | QDict *old_options, *explicit_options, *options_copy; |
| 3042 | int flags; |
| 3043 | QemuOpts *opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 3044 | |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3045 | /* Make sure that the caller remembered to use a drained section. This is |
| 3046 | * important to avoid graph changes between the recursive queuing here and |
| 3047 | * bdrv_reopen_multiple(). */ |
| 3048 | assert(bs->quiesce_counter > 0); |
| 3049 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3050 | if (bs_queue == NULL) { |
| 3051 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 3052 | QSIMPLEQ_INIT(bs_queue); |
| 3053 | } |
| 3054 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3055 | if (!options) { |
| 3056 | options = qdict_new(); |
| 3057 | } |
| 3058 | |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 3059 | /* Check if this BlockDriverState is already in the queue */ |
| 3060 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 3061 | if (bs == bs_entry->state.bs) { |
| 3062 | break; |
| 3063 | } |
| 3064 | } |
| 3065 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3066 | /* |
| 3067 | * Precedence of options: |
| 3068 | * 1. Explicitly passed in options (highest) |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3069 | * 2. Retained from explicitly set options of bs |
| 3070 | * 3. Inherited from parent node |
| 3071 | * 4. Retained from effective options of bs |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3072 | */ |
| 3073 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3074 | /* Old explicitly set values (don't overwrite by inherited value) */ |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3075 | if (bs_entry || keep_old_opts) { |
| 3076 | old_options = qdict_clone_shallow(bs_entry ? |
| 3077 | bs_entry->state.explicit_options : |
| 3078 | bs->explicit_options); |
| 3079 | bdrv_join_options(bs, options, old_options); |
| 3080 | qobject_unref(old_options); |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 3081 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3082 | |
| 3083 | explicit_options = qdict_clone_shallow(options); |
| 3084 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3085 | /* Inherit from parent node */ |
| 3086 | if (parent_options) { |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3087 | flags = 0; |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 3088 | role->inherit_options(&flags, options, parent_flags, parent_options); |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3089 | } else { |
| 3090 | flags = bdrv_get_flags(bs); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3091 | } |
| 3092 | |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3093 | if (keep_old_opts) { |
| 3094 | /* Old values are used for options that aren't set yet */ |
| 3095 | old_options = qdict_clone_shallow(bs->options); |
| 3096 | bdrv_join_options(bs, options, old_options); |
| 3097 | qobject_unref(old_options); |
| 3098 | } |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3099 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3100 | /* We have the final set of options so let's update the flags */ |
| 3101 | options_copy = qdict_clone_shallow(options); |
| 3102 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 3103 | qemu_opts_absorb_qdict(opts, options_copy, NULL); |
| 3104 | update_flags_from_options(&flags, opts); |
| 3105 | qemu_opts_del(opts); |
| 3106 | qobject_unref(options_copy); |
| 3107 | |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 3108 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 3109 | flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 3110 | if (flags & BDRV_O_RDWR) { |
| 3111 | flags |= BDRV_O_ALLOW_RDWR; |
| 3112 | } |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 3113 | |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 3114 | if (!bs_entry) { |
| 3115 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 3116 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 3117 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3118 | qobject_unref(bs_entry->state.options); |
| 3119 | qobject_unref(bs_entry->state.explicit_options); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 3120 | } |
| 3121 | |
| 3122 | bs_entry->state.bs = bs; |
| 3123 | bs_entry->state.options = options; |
| 3124 | bs_entry->state.explicit_options = explicit_options; |
| 3125 | bs_entry->state.flags = flags; |
| 3126 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3127 | /* This needs to be overwritten in bdrv_reopen_prepare() */ |
| 3128 | bs_entry->state.perm = UINT64_MAX; |
| 3129 | bs_entry->state.shared_perm = 0; |
| 3130 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 3131 | /* |
| 3132 | * If keep_old_opts is false then it means that unspecified |
| 3133 | * options must be reset to their original value. We don't allow |
| 3134 | * resetting 'backing' but we need to know if the option is |
| 3135 | * missing in order to decide if we have to return an error. |
| 3136 | */ |
| 3137 | if (!keep_old_opts) { |
| 3138 | bs_entry->state.backing_missing = |
| 3139 | !qdict_haskey(options, "backing") && |
| 3140 | !qdict_haskey(options, "backing.driver"); |
| 3141 | } |
| 3142 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 3143 | QLIST_FOREACH(child, &bs->children, next) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 3144 | QDict *new_child_options = NULL; |
| 3145 | bool child_keep_old = keep_old_opts; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 3146 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 3147 | /* reopen can only change the options of block devices that were |
| 3148 | * implicitly created and inherited options. For other (referenced) |
| 3149 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 3150 | if (child->bs->inherits_from != bs) { |
| 3151 | continue; |
| 3152 | } |
| 3153 | |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 3154 | /* Check if the options contain a child reference */ |
| 3155 | if (qdict_haskey(options, child->name)) { |
| 3156 | const char *childref = qdict_get_try_str(options, child->name); |
| 3157 | /* |
| 3158 | * The current child must not be reopened if the child |
| 3159 | * reference is null or points to a different node. |
| 3160 | */ |
| 3161 | if (g_strcmp0(childref, child->bs->node_name)) { |
| 3162 | continue; |
| 3163 | } |
| 3164 | /* |
| 3165 | * If the child reference points to the current child then |
| 3166 | * reopen it with its existing set of options (note that |
| 3167 | * it can still inherit new options from the parent). |
| 3168 | */ |
| 3169 | child_keep_old = true; |
| 3170 | } else { |
| 3171 | /* Extract child options ("child-name.*") */ |
| 3172 | char *child_key_dot = g_strdup_printf("%s.", child->name); |
| 3173 | qdict_extract_subqdict(explicit_options, NULL, child_key_dot); |
| 3174 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 3175 | g_free(child_key_dot); |
| 3176 | } |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 3177 | |
Alberto Garcia | 9aa09dd | 2018-11-12 16:00:45 +0200 | [diff] [blame] | 3178 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 3179 | child->role, options, flags, child_keep_old); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3180 | } |
| 3181 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3182 | return bs_queue; |
| 3183 | } |
| 3184 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3185 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 3186 | BlockDriverState *bs, |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3187 | QDict *options, bool keep_old_opts) |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3188 | { |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3189 | return bdrv_reopen_queue_child(bs_queue, bs, options, NULL, NULL, 0, |
| 3190 | keep_old_opts); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 3191 | } |
| 3192 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3193 | /* |
| 3194 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 3195 | * |
| 3196 | * The queue passed in (bs_queue) must have been built up previous |
| 3197 | * via bdrv_reopen_queue(). |
| 3198 | * |
| 3199 | * Reopens all BDS specified in the queue, with the appropriate |
| 3200 | * flags. All devices are prepared for reopen, and failure of any |
Stefan Weil | 50d6a8a | 2018-07-12 21:51:20 +0200 | [diff] [blame] | 3201 | * device will cause all device changes to be abandoned, and intermediate |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3202 | * data cleaned up. |
| 3203 | * |
| 3204 | * If all devices prepare successfully, then the changes are committed |
| 3205 | * to all devices. |
| 3206 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3207 | * All affected nodes must be drained between bdrv_reopen_queue() and |
| 3208 | * bdrv_reopen_multiple(). |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3209 | */ |
Paolo Bonzini | 720150f | 2016-10-27 12:49:02 +0200 | [diff] [blame] | 3210 | int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3211 | { |
| 3212 | int ret = -1; |
| 3213 | BlockReopenQueueEntry *bs_entry, *next; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3214 | |
| 3215 | assert(bs_queue != NULL); |
| 3216 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3217 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3218 | assert(bs_entry->state.bs->quiesce_counter > 0); |
Kevin Wolf | a4615ab | 2019-03-05 16:51:13 +0100 | [diff] [blame] | 3219 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, errp)) { |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3220 | goto cleanup; |
| 3221 | } |
| 3222 | bs_entry->prepared = true; |
| 3223 | } |
| 3224 | |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 3225 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 3226 | BDRVReopenState *state = &bs_entry->state; |
| 3227 | ret = bdrv_check_perm(state->bs, bs_queue, state->perm, |
| 3228 | state->shared_perm, NULL, errp); |
| 3229 | if (ret < 0) { |
| 3230 | goto cleanup_perm; |
| 3231 | } |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3232 | /* Check if new_backing_bs would accept the new permissions */ |
| 3233 | if (state->replace_backing_bs && state->new_backing_bs) { |
| 3234 | uint64_t nperm, nshared; |
| 3235 | bdrv_child_perm(state->bs, state->new_backing_bs, |
| 3236 | NULL, &child_backing, bs_queue, |
| 3237 | state->perm, state->shared_perm, |
| 3238 | &nperm, &nshared); |
| 3239 | ret = bdrv_check_update_perm(state->new_backing_bs, NULL, |
| 3240 | nperm, nshared, NULL, errp); |
| 3241 | if (ret < 0) { |
| 3242 | goto cleanup_perm; |
| 3243 | } |
| 3244 | } |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 3245 | bs_entry->perms_checked = true; |
| 3246 | } |
| 3247 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3248 | /* If we reach this point, we have success and just need to apply the |
| 3249 | * changes |
| 3250 | */ |
| 3251 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 3252 | bdrv_reopen_commit(&bs_entry->state); |
| 3253 | } |
| 3254 | |
| 3255 | ret = 0; |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 3256 | cleanup_perm: |
| 3257 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 3258 | BDRVReopenState *state = &bs_entry->state; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3259 | |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 3260 | if (!bs_entry->perms_checked) { |
| 3261 | continue; |
| 3262 | } |
| 3263 | |
| 3264 | if (ret == 0) { |
| 3265 | bdrv_set_perm(state->bs, state->perm, state->shared_perm); |
| 3266 | } else { |
| 3267 | bdrv_abort_perm_update(state->bs); |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3268 | if (state->replace_backing_bs && state->new_backing_bs) { |
| 3269 | bdrv_abort_perm_update(state->new_backing_bs); |
| 3270 | } |
Kevin Wolf | 69b736e | 2019-03-05 17:18:22 +0100 | [diff] [blame] | 3271 | } |
| 3272 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3273 | cleanup: |
| 3274 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
Alberto Garcia | 1bab38e | 2018-06-29 14:37:01 +0300 | [diff] [blame] | 3275 | if (ret) { |
| 3276 | if (bs_entry->prepared) { |
| 3277 | bdrv_reopen_abort(&bs_entry->state); |
| 3278 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3279 | qobject_unref(bs_entry->state.explicit_options); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3280 | qobject_unref(bs_entry->state.options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3281 | } |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3282 | if (bs_entry->state.new_backing_bs) { |
| 3283 | bdrv_unref(bs_entry->state.new_backing_bs); |
| 3284 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3285 | g_free(bs_entry); |
| 3286 | } |
| 3287 | g_free(bs_queue); |
Alberto Garcia | 40840e4 | 2016-10-28 10:08:03 +0300 | [diff] [blame] | 3288 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3289 | return ret; |
| 3290 | } |
| 3291 | |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 3292 | int bdrv_reopen_set_read_only(BlockDriverState *bs, bool read_only, |
| 3293 | Error **errp) |
| 3294 | { |
| 3295 | int ret; |
| 3296 | BlockReopenQueue *queue; |
| 3297 | QDict *opts = qdict_new(); |
| 3298 | |
| 3299 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, read_only); |
| 3300 | |
| 3301 | bdrv_subtree_drained_begin(bs); |
Alberto Garcia | 077e8e2 | 2019-03-12 18:48:44 +0200 | [diff] [blame] | 3302 | queue = bdrv_reopen_queue(NULL, bs, opts, true); |
Alberto Garcia | 6e1000a | 2018-11-12 16:00:33 +0200 | [diff] [blame] | 3303 | ret = bdrv_reopen_multiple(bdrv_get_aio_context(bs), queue, errp); |
| 3304 | bdrv_subtree_drained_end(bs); |
| 3305 | |
| 3306 | return ret; |
| 3307 | } |
| 3308 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3309 | static BlockReopenQueueEntry *find_parent_in_reopen_queue(BlockReopenQueue *q, |
| 3310 | BdrvChild *c) |
| 3311 | { |
| 3312 | BlockReopenQueueEntry *entry; |
| 3313 | |
| 3314 | QSIMPLEQ_FOREACH(entry, q, entry) { |
| 3315 | BlockDriverState *bs = entry->state.bs; |
| 3316 | BdrvChild *child; |
| 3317 | |
| 3318 | QLIST_FOREACH(child, &bs->children, next) { |
| 3319 | if (child == c) { |
| 3320 | return entry; |
| 3321 | } |
| 3322 | } |
| 3323 | } |
| 3324 | |
| 3325 | return NULL; |
| 3326 | } |
| 3327 | |
| 3328 | static void bdrv_reopen_perm(BlockReopenQueue *q, BlockDriverState *bs, |
| 3329 | uint64_t *perm, uint64_t *shared) |
| 3330 | { |
| 3331 | BdrvChild *c; |
| 3332 | BlockReopenQueueEntry *parent; |
| 3333 | uint64_t cumulative_perms = 0; |
| 3334 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 3335 | |
| 3336 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 3337 | parent = find_parent_in_reopen_queue(q, c); |
| 3338 | if (!parent) { |
| 3339 | cumulative_perms |= c->perm; |
| 3340 | cumulative_shared_perms &= c->shared_perm; |
| 3341 | } else { |
| 3342 | uint64_t nperm, nshared; |
| 3343 | |
| 3344 | bdrv_child_perm(parent->state.bs, bs, c, c->role, q, |
| 3345 | parent->state.perm, parent->state.shared_perm, |
| 3346 | &nperm, &nshared); |
| 3347 | |
| 3348 | cumulative_perms |= nperm; |
| 3349 | cumulative_shared_perms &= nshared; |
| 3350 | } |
| 3351 | } |
| 3352 | *perm = cumulative_perms; |
| 3353 | *shared = cumulative_shared_perms; |
| 3354 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3355 | |
| 3356 | /* |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3357 | * Take a BDRVReopenState and check if the value of 'backing' in the |
| 3358 | * reopen_state->options QDict is valid or not. |
| 3359 | * |
| 3360 | * If 'backing' is missing from the QDict then return 0. |
| 3361 | * |
| 3362 | * If 'backing' contains the node name of the backing file of |
| 3363 | * reopen_state->bs then return 0. |
| 3364 | * |
| 3365 | * If 'backing' contains a different node name (or is null) then check |
| 3366 | * whether the current backing file can be replaced with the new one. |
| 3367 | * If that's the case then reopen_state->replace_backing_bs is set to |
| 3368 | * true and reopen_state->new_backing_bs contains a pointer to the new |
| 3369 | * backing BlockDriverState (or NULL). |
| 3370 | * |
| 3371 | * Return 0 on success, otherwise return < 0 and set @errp. |
| 3372 | */ |
| 3373 | static int bdrv_reopen_parse_backing(BDRVReopenState *reopen_state, |
| 3374 | Error **errp) |
| 3375 | { |
| 3376 | BlockDriverState *bs = reopen_state->bs; |
| 3377 | BlockDriverState *overlay_bs, *new_backing_bs; |
| 3378 | QObject *value; |
| 3379 | const char *str; |
| 3380 | |
| 3381 | value = qdict_get(reopen_state->options, "backing"); |
| 3382 | if (value == NULL) { |
| 3383 | return 0; |
| 3384 | } |
| 3385 | |
| 3386 | switch (qobject_type(value)) { |
| 3387 | case QTYPE_QNULL: |
| 3388 | new_backing_bs = NULL; |
| 3389 | break; |
| 3390 | case QTYPE_QSTRING: |
| 3391 | str = qobject_get_try_str(value); |
| 3392 | new_backing_bs = bdrv_lookup_bs(NULL, str, errp); |
| 3393 | if (new_backing_bs == NULL) { |
| 3394 | return -EINVAL; |
| 3395 | } else if (bdrv_recurse_has_child(new_backing_bs, bs)) { |
| 3396 | error_setg(errp, "Making '%s' a backing file of '%s' " |
| 3397 | "would create a cycle", str, bs->node_name); |
| 3398 | return -EINVAL; |
| 3399 | } |
| 3400 | break; |
| 3401 | default: |
| 3402 | /* 'backing' does not allow any other data type */ |
| 3403 | g_assert_not_reached(); |
| 3404 | } |
| 3405 | |
| 3406 | /* |
| 3407 | * TODO: before removing the x- prefix from x-blockdev-reopen we |
| 3408 | * should move the new backing file into the right AioContext |
| 3409 | * instead of returning an error. |
| 3410 | */ |
| 3411 | if (new_backing_bs) { |
| 3412 | if (bdrv_get_aio_context(new_backing_bs) != bdrv_get_aio_context(bs)) { |
| 3413 | error_setg(errp, "Cannot use a new backing file " |
| 3414 | "with a different AioContext"); |
| 3415 | return -EINVAL; |
| 3416 | } |
| 3417 | } |
| 3418 | |
| 3419 | /* |
| 3420 | * Find the "actual" backing file by skipping all links that point |
| 3421 | * to an implicit node, if any (e.g. a commit filter node). |
| 3422 | */ |
| 3423 | overlay_bs = bs; |
| 3424 | while (backing_bs(overlay_bs) && backing_bs(overlay_bs)->implicit) { |
| 3425 | overlay_bs = backing_bs(overlay_bs); |
| 3426 | } |
| 3427 | |
| 3428 | /* If we want to replace the backing file we need some extra checks */ |
| 3429 | if (new_backing_bs != backing_bs(overlay_bs)) { |
| 3430 | /* Check for implicit nodes between bs and its backing file */ |
| 3431 | if (bs != overlay_bs) { |
| 3432 | error_setg(errp, "Cannot change backing link if '%s' has " |
| 3433 | "an implicit backing file", bs->node_name); |
| 3434 | return -EPERM; |
| 3435 | } |
| 3436 | /* Check if the backing link that we want to replace is frozen */ |
| 3437 | if (bdrv_is_backing_chain_frozen(overlay_bs, backing_bs(overlay_bs), |
| 3438 | errp)) { |
| 3439 | return -EPERM; |
| 3440 | } |
| 3441 | reopen_state->replace_backing_bs = true; |
| 3442 | if (new_backing_bs) { |
| 3443 | bdrv_ref(new_backing_bs); |
| 3444 | reopen_state->new_backing_bs = new_backing_bs; |
| 3445 | } |
| 3446 | } |
| 3447 | |
| 3448 | return 0; |
| 3449 | } |
| 3450 | |
| 3451 | /* |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3452 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 3453 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 3454 | * the block driver layer .bdrv_reopen_prepare() |
| 3455 | * |
| 3456 | * bs is the BlockDriverState to reopen |
| 3457 | * flags are the new open flags |
| 3458 | * queue is the reopen queue |
| 3459 | * |
| 3460 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 3461 | * as well. |
| 3462 | * |
| 3463 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 3464 | * It is the responsibility of the caller to then call the abort() or |
| 3465 | * commit() for any other BDS that have been left in a prepare() state |
| 3466 | * |
| 3467 | */ |
| 3468 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 3469 | Error **errp) |
| 3470 | { |
| 3471 | int ret = -1; |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 3472 | int old_flags; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3473 | Error *local_err = NULL; |
| 3474 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3475 | QemuOpts *opts; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3476 | QDict *orig_reopen_opts; |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 3477 | char *discard = NULL; |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 3478 | bool read_only; |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 3479 | bool drv_prepared = false; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3480 | |
| 3481 | assert(reopen_state != NULL); |
| 3482 | assert(reopen_state->bs->drv != NULL); |
| 3483 | drv = reopen_state->bs->drv; |
| 3484 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3485 | /* This function and each driver's bdrv_reopen_prepare() remove |
| 3486 | * entries from reopen_state->options as they are processed, so |
| 3487 | * we need to make a copy of the original QDict. */ |
| 3488 | orig_reopen_opts = qdict_clone_shallow(reopen_state->options); |
| 3489 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3490 | /* Process generic block layer options */ |
| 3491 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 3492 | qemu_opts_absorb_qdict(opts, reopen_state->options, &local_err); |
| 3493 | if (local_err) { |
| 3494 | error_propagate(errp, local_err); |
| 3495 | ret = -EINVAL; |
| 3496 | goto error; |
| 3497 | } |
| 3498 | |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 3499 | /* This was already called in bdrv_reopen_queue_child() so the flags |
| 3500 | * are up-to-date. This time we simply want to remove the options from |
| 3501 | * QemuOpts in order to indicate that they have been processed. */ |
| 3502 | old_flags = reopen_state->flags; |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 3503 | update_flags_from_options(&reopen_state->flags, opts); |
Alberto Garcia | e6d79c4 | 2018-11-12 16:00:47 +0200 | [diff] [blame] | 3504 | assert(old_flags == reopen_state->flags); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 3505 | |
Alberto Garcia | 415bbca | 2018-10-03 13:23:13 +0300 | [diff] [blame] | 3506 | discard = qemu_opt_get_del(opts, BDRV_OPT_DISCARD); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 3507 | if (discard != NULL) { |
| 3508 | if (bdrv_parse_discard_flags(discard, &reopen_state->flags) != 0) { |
| 3509 | error_setg(errp, "Invalid discard option"); |
| 3510 | ret = -EINVAL; |
| 3511 | goto error; |
| 3512 | } |
| 3513 | } |
| 3514 | |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 3515 | reopen_state->detect_zeroes = |
| 3516 | bdrv_parse_detect_zeroes(opts, reopen_state->flags, &local_err); |
| 3517 | if (local_err) { |
| 3518 | error_propagate(errp, local_err); |
| 3519 | ret = -EINVAL; |
| 3520 | goto error; |
| 3521 | } |
| 3522 | |
Alberto Garcia | 57f9db9 | 2018-09-06 12:37:06 +0300 | [diff] [blame] | 3523 | /* All other options (including node-name and driver) must be unchanged. |
| 3524 | * Put them back into the QDict, so that they are checked at the end |
| 3525 | * of this function. */ |
| 3526 | qemu_opts_to_qdict(opts, reopen_state->options); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3527 | |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 3528 | /* If we are to stay read-only, do not allow permission change |
| 3529 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is |
| 3530 | * not set, or if the BDS still has copy_on_read enabled */ |
| 3531 | read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 3532 | ret = bdrv_can_set_read_only(reopen_state->bs, read_only, true, &local_err); |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 3533 | if (local_err) { |
| 3534 | error_propagate(errp, local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3535 | goto error; |
| 3536 | } |
| 3537 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3538 | /* Calculate required permissions after reopening */ |
| 3539 | bdrv_reopen_perm(queue, reopen_state->bs, |
| 3540 | &reopen_state->perm, &reopen_state->shared_perm); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3541 | |
| 3542 | ret = bdrv_flush(reopen_state->bs); |
| 3543 | if (ret) { |
Eric Blake | 455b0fd | 2015-11-10 23:51:20 -0700 | [diff] [blame] | 3544 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3545 | goto error; |
| 3546 | } |
| 3547 | |
| 3548 | if (drv->bdrv_reopen_prepare) { |
| 3549 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 3550 | if (ret) { |
| 3551 | if (local_err != NULL) { |
| 3552 | error_propagate(errp, local_err); |
| 3553 | } else { |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 3554 | bdrv_refresh_filename(reopen_state->bs); |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 3555 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 3556 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3557 | } |
| 3558 | goto error; |
| 3559 | } |
| 3560 | } else { |
| 3561 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 3562 | * handler for each supported drv. */ |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 3563 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 3564 | "does not support reopening files", drv->format_name, |
| 3565 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3566 | ret = -1; |
| 3567 | goto error; |
| 3568 | } |
| 3569 | |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 3570 | drv_prepared = true; |
| 3571 | |
Alberto Garcia | bacd9b8 | 2019-03-12 18:48:46 +0200 | [diff] [blame] | 3572 | /* |
| 3573 | * We must provide the 'backing' option if the BDS has a backing |
| 3574 | * file or if the image file has a backing file name as part of |
| 3575 | * its metadata. Otherwise the 'backing' option can be omitted. |
| 3576 | */ |
| 3577 | if (drv->supports_backing && reopen_state->backing_missing && |
| 3578 | (backing_bs(reopen_state->bs) || reopen_state->bs->backing_file[0])) { |
Alberto Garcia | 8546632 | 2019-03-12 18:48:45 +0200 | [diff] [blame] | 3579 | error_setg(errp, "backing is missing for '%s'", |
| 3580 | reopen_state->bs->node_name); |
| 3581 | ret = -EINVAL; |
| 3582 | goto error; |
| 3583 | } |
| 3584 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3585 | /* |
| 3586 | * Allow changing the 'backing' option. The new value can be |
| 3587 | * either a reference to an existing node (using its node name) |
| 3588 | * or NULL to simply detach the current backing file. |
| 3589 | */ |
| 3590 | ret = bdrv_reopen_parse_backing(reopen_state, errp); |
| 3591 | if (ret < 0) { |
| 3592 | goto error; |
| 3593 | } |
| 3594 | qdict_del(reopen_state->options, "backing"); |
| 3595 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3596 | /* Options that are not handled are only okay if they are unchanged |
| 3597 | * compared to the old state. It is expected that some options are only |
| 3598 | * used for the initial open, but not reopen (e.g. filename) */ |
| 3599 | if (qdict_size(reopen_state->options)) { |
| 3600 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 3601 | |
| 3602 | do { |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 3603 | QObject *new = entry->value; |
| 3604 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3605 | |
Alberto Garcia | db90528 | 2018-09-06 12:37:05 +0300 | [diff] [blame] | 3606 | /* Allow child references (child_name=node_name) as long as they |
| 3607 | * point to the current child (i.e. everything stays the same). */ |
| 3608 | if (qobject_type(new) == QTYPE_QSTRING) { |
| 3609 | BdrvChild *child; |
| 3610 | QLIST_FOREACH(child, &reopen_state->bs->children, next) { |
| 3611 | if (!strcmp(child->name, entry->key)) { |
| 3612 | break; |
| 3613 | } |
| 3614 | } |
| 3615 | |
| 3616 | if (child) { |
| 3617 | const char *str = qobject_get_try_str(new); |
| 3618 | if (!strcmp(child->bs->node_name, str)) { |
| 3619 | continue; /* Found child with this name, skip option */ |
| 3620 | } |
| 3621 | } |
| 3622 | } |
| 3623 | |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 3624 | /* |
| 3625 | * TODO: When using -drive to specify blockdev options, all values |
| 3626 | * will be strings; however, when using -blockdev, blockdev-add or |
| 3627 | * filenames using the json:{} pseudo-protocol, they will be |
| 3628 | * correctly typed. |
| 3629 | * In contrast, reopening options are (currently) always strings |
| 3630 | * (because you can only specify them through qemu-io; all other |
| 3631 | * callers do not specify any options). |
| 3632 | * Therefore, when using anything other than -drive to create a BDS, |
| 3633 | * this cannot detect non-string options as unchanged, because |
| 3634 | * qobject_is_equal() always returns false for objects of different |
| 3635 | * type. In the future, this should be remedied by correctly typing |
| 3636 | * all options. For now, this is not too big of an issue because |
| 3637 | * the user can simply omit options which cannot be changed anyway, |
| 3638 | * so they will stay unchanged. |
| 3639 | */ |
| 3640 | if (!qobject_is_equal(new, old)) { |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3641 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 3642 | ret = -EINVAL; |
| 3643 | goto error; |
| 3644 | } |
| 3645 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 3646 | } |
| 3647 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3648 | ret = 0; |
| 3649 | |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3650 | /* Restore the original reopen_state->options QDict */ |
| 3651 | qobject_unref(reopen_state->options); |
| 3652 | reopen_state->options = qobject_ref(orig_reopen_opts); |
| 3653 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3654 | error: |
Max Reitz | 9ad08c4 | 2018-11-16 17:45:24 +0100 | [diff] [blame] | 3655 | if (ret < 0 && drv_prepared) { |
| 3656 | /* drv->bdrv_reopen_prepare() has succeeded, so we need to |
| 3657 | * call drv->bdrv_reopen_abort() before signaling an error |
| 3658 | * (bdrv_reopen_multiple() will not call bdrv_reopen_abort() |
| 3659 | * when the respective bdrv_reopen_prepare() has failed) */ |
| 3660 | if (drv->bdrv_reopen_abort) { |
| 3661 | drv->bdrv_reopen_abort(reopen_state); |
| 3662 | } |
| 3663 | } |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3664 | qemu_opts_del(opts); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3665 | qobject_unref(orig_reopen_opts); |
Alberto Garcia | 593b307 | 2018-09-06 12:37:08 +0300 | [diff] [blame] | 3666 | g_free(discard); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3667 | return ret; |
| 3668 | } |
| 3669 | |
| 3670 | /* |
| 3671 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 3672 | * makes them final by swapping the staging BlockDriverState contents into |
| 3673 | * the active BlockDriverState contents. |
| 3674 | */ |
| 3675 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 3676 | { |
| 3677 | BlockDriver *drv; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3678 | BlockDriverState *bs; |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 3679 | BdrvChild *child; |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3680 | bool old_can_write, new_can_write; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3681 | |
| 3682 | assert(reopen_state != NULL); |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3683 | bs = reopen_state->bs; |
| 3684 | drv = bs->drv; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3685 | assert(drv != NULL); |
| 3686 | |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3687 | old_can_write = |
| 3688 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); |
| 3689 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3690 | /* If there are any driver level actions to take */ |
| 3691 | if (drv->bdrv_reopen_commit) { |
| 3692 | drv->bdrv_reopen_commit(reopen_state); |
| 3693 | } |
| 3694 | |
| 3695 | /* set BDS specific flags now */ |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3696 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3697 | qobject_unref(bs->options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3698 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3699 | bs->explicit_options = reopen_state->explicit_options; |
Alberto Garcia | 4c8350f | 2018-06-29 14:37:02 +0300 | [diff] [blame] | 3700 | bs->options = reopen_state->options; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3701 | bs->open_flags = reopen_state->flags; |
| 3702 | bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Alberto Garcia | 543770b | 2018-09-06 12:37:09 +0300 | [diff] [blame] | 3703 | bs->detect_zeroes = reopen_state->detect_zeroes; |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 3704 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3705 | if (reopen_state->replace_backing_bs) { |
| 3706 | qdict_del(bs->explicit_options, "backing"); |
| 3707 | qdict_del(bs->options, "backing"); |
| 3708 | } |
| 3709 | |
Alberto Garcia | 50196d7 | 2018-09-06 12:37:03 +0300 | [diff] [blame] | 3710 | /* Remove child references from bs->options and bs->explicit_options. |
| 3711 | * Child options were already removed in bdrv_reopen_queue_child() */ |
| 3712 | QLIST_FOREACH(child, &bs->children, next) { |
| 3713 | qdict_del(bs->explicit_options, child->name); |
| 3714 | qdict_del(bs->options, child->name); |
| 3715 | } |
| 3716 | |
Alberto Garcia | cb828c3 | 2019-03-12 18:48:47 +0200 | [diff] [blame^] | 3717 | /* |
| 3718 | * Change the backing file if a new one was specified. We do this |
| 3719 | * after updating bs->options, so bdrv_refresh_filename() (called |
| 3720 | * from bdrv_set_backing_hd()) has the new values. |
| 3721 | */ |
| 3722 | if (reopen_state->replace_backing_bs) { |
| 3723 | BlockDriverState *old_backing_bs = backing_bs(bs); |
| 3724 | assert(!old_backing_bs || !old_backing_bs->implicit); |
| 3725 | /* Abort the permission update on the backing bs we're detaching */ |
| 3726 | if (old_backing_bs) { |
| 3727 | bdrv_abort_perm_update(old_backing_bs); |
| 3728 | } |
| 3729 | bdrv_set_backing_hd(bs, reopen_state->new_backing_bs, &error_abort); |
| 3730 | } |
| 3731 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3732 | bdrv_refresh_limits(bs, NULL); |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3733 | |
| 3734 | new_can_write = |
| 3735 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); |
| 3736 | if (!old_can_write && new_can_write && drv->bdrv_reopen_bitmaps_rw) { |
| 3737 | Error *local_err = NULL; |
| 3738 | if (drv->bdrv_reopen_bitmaps_rw(bs, &local_err) < 0) { |
| 3739 | /* This is not fatal, bitmaps just left read-only, so all following |
| 3740 | * writes will fail. User can remove read-only bitmaps to unblock |
| 3741 | * writes. |
| 3742 | */ |
| 3743 | error_reportf_err(local_err, |
| 3744 | "%s: Failed to make dirty bitmaps writable: ", |
| 3745 | bdrv_get_node_name(bs)); |
| 3746 | } |
| 3747 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3748 | } |
| 3749 | |
| 3750 | /* |
| 3751 | * Abort the reopen, and delete and free the staged changes in |
| 3752 | * reopen_state |
| 3753 | */ |
| 3754 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 3755 | { |
| 3756 | BlockDriver *drv; |
| 3757 | |
| 3758 | assert(reopen_state != NULL); |
| 3759 | drv = reopen_state->bs->drv; |
| 3760 | assert(drv != NULL); |
| 3761 | |
| 3762 | if (drv->bdrv_reopen_abort) { |
| 3763 | drv->bdrv_reopen_abort(reopen_state); |
| 3764 | } |
| 3765 | } |
| 3766 | |
| 3767 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 3768 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3769 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3770 | BdrvAioNotifier *ban, *ban_next; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3771 | BdrvChild *child, *next; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3772 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3773 | assert(!bs->job); |
Max Reitz | 30f55fb | 2016-05-17 16:41:32 +0200 | [diff] [blame] | 3774 | assert(!bs->refcnt); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 3775 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3776 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 3777 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 3778 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3779 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 3780 | if (bs->drv) { |
Vladimir Sementsov-Ogievskiy | 3c00529 | 2018-08-14 15:43:19 +0300 | [diff] [blame] | 3781 | if (bs->drv->bdrv_close) { |
| 3782 | bs->drv->bdrv_close(bs); |
| 3783 | } |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3784 | bs->drv = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3785 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 3786 | |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3787 | bdrv_set_backing_hd(bs, NULL, &error_abort); |
| 3788 | |
| 3789 | if (bs->file != NULL) { |
| 3790 | bdrv_unref_child(bs, bs->file); |
| 3791 | bs->file = NULL; |
| 3792 | } |
| 3793 | |
| 3794 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
| 3795 | /* TODO Remove bdrv_unref() from drivers' close function and use |
| 3796 | * bdrv_unref_child() here */ |
| 3797 | if (child->bs->inherits_from == bs) { |
| 3798 | child->bs->inherits_from = NULL; |
| 3799 | } |
| 3800 | bdrv_detach_child(child); |
| 3801 | } |
| 3802 | |
| 3803 | g_free(bs->opaque); |
| 3804 | bs->opaque = NULL; |
| 3805 | atomic_set(&bs->copy_on_read, 0); |
| 3806 | bs->backing_file[0] = '\0'; |
| 3807 | bs->backing_format[0] = '\0'; |
| 3808 | bs->total_sectors = 0; |
| 3809 | bs->encrypted = false; |
| 3810 | bs->sg = false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3811 | qobject_unref(bs->options); |
| 3812 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3813 | bs->options = NULL; |
| 3814 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3815 | qobject_unref(bs->full_open_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3816 | bs->full_open_options = NULL; |
| 3817 | |
Vladimir Sementsov-Ogievskiy | cca43ae | 2017-06-28 15:05:16 +0300 | [diff] [blame] | 3818 | bdrv_release_named_dirty_bitmaps(bs); |
| 3819 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 3820 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3821 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 3822 | g_free(ban); |
| 3823 | } |
| 3824 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3825 | bdrv_drained_end(bs); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3826 | } |
| 3827 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3828 | void bdrv_close_all(void) |
| 3829 | { |
Kevin Wolf | b3b5299 | 2018-05-16 13:46:37 +0200 | [diff] [blame] | 3830 | assert(job_next(NULL) == NULL); |
Kevin Wolf | cd7fca9 | 2016-07-06 11:22:39 +0200 | [diff] [blame] | 3831 | nbd_export_close_all(); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3832 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3833 | /* Drop references from requests still in flight, such as canceled block |
| 3834 | * jobs whose AIO context has not been polled yet */ |
| 3835 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3836 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3837 | blk_remove_all_bs(); |
| 3838 | blockdev_close_all_bdrv_states(); |
| 3839 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 3840 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3841 | } |
| 3842 | |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3843 | static bool should_update_child(BdrvChild *c, BlockDriverState *to) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3844 | { |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 3845 | GQueue *queue; |
| 3846 | GHashTable *found; |
| 3847 | bool ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3848 | |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3849 | if (c->role->stay_at_node) { |
| 3850 | return false; |
| 3851 | } |
| 3852 | |
Max Reitz | ec9f10f | 2018-06-13 20:18:15 +0200 | [diff] [blame] | 3853 | /* If the child @c belongs to the BDS @to, replacing the current |
| 3854 | * c->bs by @to would mean to create a loop. |
| 3855 | * |
| 3856 | * Such a case occurs when appending a BDS to a backing chain. |
| 3857 | * For instance, imagine the following chain: |
| 3858 | * |
| 3859 | * guest device -> node A -> further backing chain... |
| 3860 | * |
| 3861 | * Now we create a new BDS B which we want to put on top of this |
| 3862 | * chain, so we first attach A as its backing node: |
| 3863 | * |
| 3864 | * node B |
| 3865 | * | |
| 3866 | * v |
| 3867 | * guest device -> node A -> further backing chain... |
| 3868 | * |
| 3869 | * Finally we want to replace A by B. When doing that, we want to |
| 3870 | * replace all pointers to A by pointers to B -- except for the |
| 3871 | * pointer from B because (1) that would create a loop, and (2) |
| 3872 | * that pointer should simply stay intact: |
| 3873 | * |
| 3874 | * guest device -> node B |
| 3875 | * | |
| 3876 | * v |
| 3877 | * node A -> further backing chain... |
| 3878 | * |
| 3879 | * In general, when replacing a node A (c->bs) by a node B (@to), |
| 3880 | * if A is a child of B, that means we cannot replace A by B there |
| 3881 | * because that would create a loop. Silently detaching A from B |
| 3882 | * is also not really an option. So overall just leaving A in |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 3883 | * place there is the most sensible choice. |
| 3884 | * |
| 3885 | * We would also create a loop in any cases where @c is only |
| 3886 | * indirectly referenced by @to. Prevent this by returning false |
| 3887 | * if @c is found (by breadth-first search) anywhere in the whole |
| 3888 | * subtree of @to. |
| 3889 | */ |
| 3890 | |
| 3891 | ret = true; |
| 3892 | found = g_hash_table_new(NULL, NULL); |
| 3893 | g_hash_table_add(found, to); |
| 3894 | queue = g_queue_new(); |
| 3895 | g_queue_push_tail(queue, to); |
| 3896 | |
| 3897 | while (!g_queue_is_empty(queue)) { |
| 3898 | BlockDriverState *v = g_queue_pop_head(queue); |
| 3899 | BdrvChild *c2; |
| 3900 | |
| 3901 | QLIST_FOREACH(c2, &v->children, next) { |
| 3902 | if (c2 == c) { |
| 3903 | ret = false; |
| 3904 | break; |
| 3905 | } |
| 3906 | |
| 3907 | if (g_hash_table_contains(found, c2->bs)) { |
| 3908 | continue; |
| 3909 | } |
| 3910 | |
| 3911 | g_queue_push_tail(queue, c2->bs); |
| 3912 | g_hash_table_add(found, c2->bs); |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3913 | } |
| 3914 | } |
| 3915 | |
Vladimir Sementsov-Ogievskiy | 2f30b7c | 2019-02-23 22:20:39 +0300 | [diff] [blame] | 3916 | g_queue_free(queue); |
| 3917 | g_hash_table_destroy(found); |
| 3918 | |
| 3919 | return ret; |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3920 | } |
| 3921 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 3922 | void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| 3923 | Error **errp) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3924 | { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3925 | BdrvChild *c, *next; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3926 | GSList *list = NULL, *p; |
| 3927 | uint64_t old_perm, old_shared; |
| 3928 | uint64_t perm = 0, shared = BLK_PERM_ALL; |
| 3929 | int ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3930 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 3931 | assert(!atomic_read(&from->in_flight)); |
| 3932 | assert(!atomic_read(&to->in_flight)); |
| 3933 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3934 | /* Make sure that @from doesn't go away until we have successfully attached |
| 3935 | * all of its parents to @to. */ |
| 3936 | bdrv_ref(from); |
| 3937 | |
| 3938 | /* Put all parents into @list and calculate their cumulative permissions */ |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3939 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
Max Reitz | ec9f10f | 2018-06-13 20:18:15 +0200 | [diff] [blame] | 3940 | assert(c->bs == from); |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3941 | if (!should_update_child(c, to)) { |
Kevin Wolf | 26de943 | 2017-01-17 13:39:34 +0100 | [diff] [blame] | 3942 | continue; |
| 3943 | } |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 3944 | if (c->frozen) { |
| 3945 | error_setg(errp, "Cannot change '%s' link to '%s'", |
| 3946 | c->name, from->node_name); |
| 3947 | goto out; |
| 3948 | } |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3949 | list = g_slist_prepend(list, c); |
| 3950 | perm |= c->perm; |
| 3951 | shared &= c->shared_perm; |
| 3952 | } |
| 3953 | |
| 3954 | /* Check whether the required permissions can be granted on @to, ignoring |
| 3955 | * all BdrvChild in @list so that they can't block themselves. */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 3956 | ret = bdrv_check_update_perm(to, NULL, perm, shared, list, errp); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3957 | if (ret < 0) { |
| 3958 | bdrv_abort_perm_update(to); |
| 3959 | goto out; |
| 3960 | } |
| 3961 | |
| 3962 | /* Now actually perform the change. We performed the permission check for |
| 3963 | * all elements of @list at once, so set the permissions all at once at the |
| 3964 | * very end. */ |
| 3965 | for (p = list; p != NULL; p = p->next) { |
| 3966 | c = p->data; |
Max Reitz | 9bd910e | 2016-06-10 20:57:46 +0200 | [diff] [blame] | 3967 | |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3968 | bdrv_ref(to); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3969 | bdrv_replace_child_noperm(c, to); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3970 | bdrv_unref(from); |
| 3971 | } |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3972 | |
| 3973 | bdrv_get_cumulative_perm(to, &old_perm, &old_shared); |
| 3974 | bdrv_set_perm(to, old_perm | perm, old_shared | shared); |
| 3975 | |
| 3976 | out: |
| 3977 | g_slist_free(list); |
| 3978 | bdrv_unref(from); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3979 | } |
| 3980 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3981 | /* |
| 3982 | * Add new bs contents at the top of an image chain while the chain is |
| 3983 | * live, while keeping required fields on the top layer. |
| 3984 | * |
| 3985 | * This will modify the BlockDriverState fields, and swap contents |
| 3986 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 3987 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3988 | * bs_new must not be attached to a BlockBackend. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 3989 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3990 | * This function does not create any image files. |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3991 | * |
| 3992 | * bdrv_append() takes ownership of a bs_new reference and unrefs it because |
| 3993 | * that's what the callers commonly need. bs_new will be referenced by the old |
| 3994 | * parents of bs_top after bdrv_append() returns. If the caller needs to keep a |
| 3995 | * reference of its own, it must call bdrv_ref(). |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3996 | */ |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3997 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| 3998 | Error **errp) |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3999 | { |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 4000 | Error *local_err = NULL; |
| 4001 | |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 4002 | bdrv_set_backing_hd(bs_new, bs_top, &local_err); |
| 4003 | if (local_err) { |
| 4004 | error_propagate(errp, local_err); |
| 4005 | goto out; |
| 4006 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4007 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 4008 | bdrv_replace_node(bs_top, bs_new, &local_err); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 4009 | if (local_err) { |
| 4010 | error_propagate(errp, local_err); |
| 4011 | bdrv_set_backing_hd(bs_new, NULL, &error_abort); |
| 4012 | goto out; |
| 4013 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4014 | |
| 4015 | /* bs_new is now referenced by its new parents, we don't need the |
| 4016 | * additional reference any more. */ |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 4017 | out: |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 4018 | bdrv_unref(bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 4019 | } |
| 4020 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 4021 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 4022 | { |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 4023 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 4024 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 4025 | assert(!bs->refcnt); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 4026 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 4027 | bdrv_close(bs); |
| 4028 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 4029 | /* remove from list, if necessary */ |
Kevin Wolf | 63eaaae | 2016-03-18 10:46:57 +0100 | [diff] [blame] | 4030 | if (bs->node_name[0] != '\0') { |
| 4031 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 4032 | } |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 4033 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 4034 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4035 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4036 | } |
| 4037 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 4038 | /* |
| 4039 | * Run consistency checks on an image |
| 4040 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 4041 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
Stefan Weil | a1c7273 | 2011-04-28 17:20:38 +0200 | [diff] [blame] | 4042 | * free of errors) or -errno when an internal error occurred. The results of the |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 4043 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 4044 | */ |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 4045 | static int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
| 4046 | BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 4047 | { |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 4048 | if (bs->drv == NULL) { |
| 4049 | return -ENOMEDIUM; |
| 4050 | } |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 4051 | if (bs->drv->bdrv_co_check == NULL) { |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 4052 | return -ENOTSUP; |
| 4053 | } |
| 4054 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 4055 | memset(res, 0, sizeof(*res)); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 4056 | return bs->drv->bdrv_co_check(bs, res, fix); |
| 4057 | } |
| 4058 | |
| 4059 | typedef struct CheckCo { |
| 4060 | BlockDriverState *bs; |
| 4061 | BdrvCheckResult *res; |
| 4062 | BdrvCheckMode fix; |
| 4063 | int ret; |
| 4064 | } CheckCo; |
| 4065 | |
| 4066 | static void bdrv_check_co_entry(void *opaque) |
| 4067 | { |
| 4068 | CheckCo *cco = opaque; |
| 4069 | cco->ret = bdrv_co_check(cco->bs, cco->res, cco->fix); |
Kevin Wolf | 4720cbe | 2019-01-07 13:02:48 +0100 | [diff] [blame] | 4070 | aio_wait_kick(); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 4071 | } |
| 4072 | |
| 4073 | int bdrv_check(BlockDriverState *bs, |
| 4074 | BdrvCheckResult *res, BdrvCheckMode fix) |
| 4075 | { |
| 4076 | Coroutine *co; |
| 4077 | CheckCo cco = { |
| 4078 | .bs = bs, |
| 4079 | .res = res, |
| 4080 | .ret = -EINPROGRESS, |
| 4081 | .fix = fix, |
| 4082 | }; |
| 4083 | |
| 4084 | if (qemu_in_coroutine()) { |
| 4085 | /* Fast-path if already in coroutine context */ |
| 4086 | bdrv_check_co_entry(&cco); |
| 4087 | } else { |
| 4088 | co = qemu_coroutine_create(bdrv_check_co_entry, &cco); |
Kevin Wolf | 4720cbe | 2019-01-07 13:02:48 +0100 | [diff] [blame] | 4089 | bdrv_coroutine_enter(bs, co); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 4090 | BDRV_POLL_WHILE(bs, cco.ret == -EINPROGRESS); |
| 4091 | } |
| 4092 | |
| 4093 | return cco.ret; |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 4094 | } |
| 4095 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4096 | /* |
| 4097 | * Return values: |
| 4098 | * 0 - success |
| 4099 | * -EINVAL - backing format specified, but no file |
| 4100 | * -ENOSPC - can't update the backing file because no space is left in the |
| 4101 | * image file header |
| 4102 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 4103 | */ |
| 4104 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 4105 | const char *backing_file, const char *backing_fmt) |
| 4106 | { |
| 4107 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 4108 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4109 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 4110 | if (!drv) { |
| 4111 | return -ENOMEDIUM; |
| 4112 | } |
| 4113 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 4114 | /* Backing file format doesn't make sense without a backing file */ |
| 4115 | if (backing_fmt && !backing_file) { |
| 4116 | return -EINVAL; |
| 4117 | } |
| 4118 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4119 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 4120 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4121 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 4122 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4123 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 4124 | |
| 4125 | if (ret == 0) { |
| 4126 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 4127 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
Max Reitz | 998c201 | 2019-02-01 20:29:08 +0100 | [diff] [blame] | 4128 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
| 4129 | backing_file ?: ""); |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 4130 | } |
| 4131 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 4132 | } |
| 4133 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4134 | /* |
| 4135 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 4136 | * |
| 4137 | * active is the current topmost image. |
| 4138 | * |
| 4139 | * Returns NULL if bs is not found in active's image chain, |
| 4140 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 4141 | * |
| 4142 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4143 | */ |
| 4144 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 4145 | BlockDriverState *bs) |
| 4146 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4147 | while (active && bs != backing_bs(active)) { |
| 4148 | active = backing_bs(active); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4149 | } |
| 4150 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 4151 | return active; |
| 4152 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4153 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 4154 | /* Given a BDS, searches for the base layer. */ |
| 4155 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 4156 | { |
| 4157 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4158 | } |
| 4159 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4160 | /* |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 4161 | * Return true if at least one of the backing links between @bs and |
| 4162 | * @base is frozen. @errp is set if that's the case. |
| 4163 | */ |
| 4164 | bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base, |
| 4165 | Error **errp) |
| 4166 | { |
| 4167 | BlockDriverState *i; |
| 4168 | |
| 4169 | for (i = bs; i != base && i->backing; i = backing_bs(i)) { |
| 4170 | if (i->backing->frozen) { |
| 4171 | error_setg(errp, "Cannot change '%s' link from '%s' to '%s'", |
| 4172 | i->backing->name, i->node_name, |
| 4173 | backing_bs(i)->node_name); |
| 4174 | return true; |
| 4175 | } |
| 4176 | } |
| 4177 | |
| 4178 | return false; |
| 4179 | } |
| 4180 | |
| 4181 | /* |
| 4182 | * Freeze all backing links between @bs and @base. |
| 4183 | * If any of the links is already frozen the operation is aborted and |
| 4184 | * none of the links are modified. |
| 4185 | * Returns 0 on success. On failure returns < 0 and sets @errp. |
| 4186 | */ |
| 4187 | int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base, |
| 4188 | Error **errp) |
| 4189 | { |
| 4190 | BlockDriverState *i; |
| 4191 | |
| 4192 | if (bdrv_is_backing_chain_frozen(bs, base, errp)) { |
| 4193 | return -EPERM; |
| 4194 | } |
| 4195 | |
| 4196 | for (i = bs; i != base && i->backing; i = backing_bs(i)) { |
| 4197 | i->backing->frozen = true; |
| 4198 | } |
| 4199 | |
| 4200 | return 0; |
| 4201 | } |
| 4202 | |
| 4203 | /* |
| 4204 | * Unfreeze all backing links between @bs and @base. The caller must |
| 4205 | * ensure that all links are frozen before using this function. |
| 4206 | */ |
| 4207 | void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base) |
| 4208 | { |
| 4209 | BlockDriverState *i; |
| 4210 | |
| 4211 | for (i = bs; i != base && i->backing; i = backing_bs(i)) { |
| 4212 | assert(i->backing->frozen); |
| 4213 | i->backing->frozen = false; |
| 4214 | } |
| 4215 | } |
| 4216 | |
| 4217 | /* |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4218 | * Drops images above 'base' up to and including 'top', and sets the image |
| 4219 | * above 'top' to have base as its backing file. |
| 4220 | * |
| 4221 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 4222 | * information in 'bs' can be properly updated. |
| 4223 | * |
| 4224 | * E.g., this will convert the following chain: |
| 4225 | * bottom <- base <- intermediate <- top <- active |
| 4226 | * |
| 4227 | * to |
| 4228 | * |
| 4229 | * bottom <- base <- active |
| 4230 | * |
| 4231 | * It is allowed for bottom==base, in which case it converts: |
| 4232 | * |
| 4233 | * base <- intermediate <- top <- active |
| 4234 | * |
| 4235 | * to |
| 4236 | * |
| 4237 | * base <- active |
| 4238 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 4239 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 4240 | * overlay image metadata. |
| 4241 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4242 | * Error conditions: |
| 4243 | * if active == top, that is considered an error |
| 4244 | * |
| 4245 | */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 4246 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
| 4247 | const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4248 | { |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 4249 | BlockDriverState *explicit_top = top; |
| 4250 | bool update_inherits_from; |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 4251 | BdrvChild *c, *next; |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 4252 | Error *local_err = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4253 | int ret = -EIO; |
| 4254 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 4255 | bdrv_ref(top); |
| 4256 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4257 | if (!top->drv || !base->drv) { |
| 4258 | goto exit; |
| 4259 | } |
| 4260 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 4261 | /* Make sure that base is in the backing chain of top */ |
| 4262 | if (!bdrv_chain_contains(top, base)) { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4263 | goto exit; |
| 4264 | } |
| 4265 | |
Alberto Garcia | 2cad1eb | 2019-03-12 18:48:40 +0200 | [diff] [blame] | 4266 | /* This function changes all links that point to top and makes |
| 4267 | * them point to base. Check that none of them is frozen. */ |
| 4268 | QLIST_FOREACH(c, &top->parents, next_parent) { |
| 4269 | if (c->frozen) { |
| 4270 | goto exit; |
| 4271 | } |
| 4272 | } |
| 4273 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 4274 | /* If 'base' recursively inherits from 'top' then we should set |
| 4275 | * base->inherits_from to top->inherits_from after 'top' and all |
| 4276 | * other intermediate nodes have been dropped. |
| 4277 | * If 'top' is an implicit node (e.g. "commit_top") we should skip |
| 4278 | * it because no one inherits from it. We use explicit_top for that. */ |
| 4279 | while (explicit_top && explicit_top->implicit) { |
| 4280 | explicit_top = backing_bs(explicit_top); |
| 4281 | } |
| 4282 | update_inherits_from = bdrv_inherits_from_recursive(base, explicit_top); |
| 4283 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4284 | /* success - we can delete the intermediate states, and link top->base */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 4285 | /* TODO Check graph modification op blockers (BLK_PERM_GRAPH_MOD) once |
| 4286 | * we've figured out how they should work. */ |
Max Reitz | f30c66b | 2019-02-01 20:29:05 +0100 | [diff] [blame] | 4287 | if (!backing_file_str) { |
| 4288 | bdrv_refresh_filename(base); |
| 4289 | backing_file_str = base->filename; |
| 4290 | } |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 4291 | |
| 4292 | QLIST_FOREACH_SAFE(c, &top->parents, next_parent, next) { |
| 4293 | /* Check whether we are allowed to switch c from top to base */ |
| 4294 | GSList *ignore_children = g_slist_prepend(NULL, c); |
| 4295 | bdrv_check_update_perm(base, NULL, c->perm, c->shared_perm, |
| 4296 | ignore_children, &local_err); |
Fam Zheng | 2c860e7 | 2018-03-15 11:51:57 +0800 | [diff] [blame] | 4297 | g_slist_free(ignore_children); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 4298 | if (local_err) { |
| 4299 | ret = -EPERM; |
| 4300 | error_report_err(local_err); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 4301 | goto exit; |
| 4302 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 4303 | |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 4304 | /* If so, update the backing file path in the image file */ |
| 4305 | if (c->role->update_filename) { |
| 4306 | ret = c->role->update_filename(c, base, backing_file_str, |
| 4307 | &local_err); |
| 4308 | if (ret < 0) { |
| 4309 | bdrv_abort_perm_update(base); |
| 4310 | error_report_err(local_err); |
| 4311 | goto exit; |
| 4312 | } |
| 4313 | } |
| 4314 | |
| 4315 | /* Do the actual switch in the in-memory graph. |
| 4316 | * Completes bdrv_check_update_perm() transaction internally. */ |
| 4317 | bdrv_ref(base); |
| 4318 | bdrv_replace_child(c, base); |
| 4319 | bdrv_unref(top); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 4320 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4321 | |
Alberto Garcia | 6bd858b | 2018-10-31 18:16:38 +0200 | [diff] [blame] | 4322 | if (update_inherits_from) { |
| 4323 | base->inherits_from = explicit_top->inherits_from; |
| 4324 | } |
| 4325 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4326 | ret = 0; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4327 | exit: |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 4328 | bdrv_unref(top); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 4329 | return ret; |
| 4330 | } |
| 4331 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4332 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 4333 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 4334 | * allocated space. Return < 0 if error or unknown. |
| 4335 | */ |
| 4336 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 4337 | { |
| 4338 | BlockDriver *drv = bs->drv; |
| 4339 | if (!drv) { |
| 4340 | return -ENOMEDIUM; |
| 4341 | } |
| 4342 | if (drv->bdrv_get_allocated_file_size) { |
| 4343 | return drv->bdrv_get_allocated_file_size(bs); |
| 4344 | } |
| 4345 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4346 | return bdrv_get_allocated_file_size(bs->file->bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 4347 | } |
| 4348 | return -ENOTSUP; |
| 4349 | } |
| 4350 | |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 4351 | /* |
| 4352 | * bdrv_measure: |
| 4353 | * @drv: Format driver |
| 4354 | * @opts: Creation options for new image |
| 4355 | * @in_bs: Existing image containing data for new image (may be NULL) |
| 4356 | * @errp: Error object |
| 4357 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) |
| 4358 | * or NULL on error |
| 4359 | * |
| 4360 | * Calculate file size required to create a new image. |
| 4361 | * |
| 4362 | * If @in_bs is given then space for allocated clusters and zero clusters |
| 4363 | * from that image are included in the calculation. If @opts contains a |
| 4364 | * backing file that is shared by @in_bs then backing clusters may be omitted |
| 4365 | * from the calculation. |
| 4366 | * |
| 4367 | * If @in_bs is NULL then the calculation includes no allocated clusters |
| 4368 | * unless a preallocation option is given in @opts. |
| 4369 | * |
| 4370 | * Note that @in_bs may use a different BlockDriver from @drv. |
| 4371 | * |
| 4372 | * If an error occurs the @errp pointer is set. |
| 4373 | */ |
| 4374 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| 4375 | BlockDriverState *in_bs, Error **errp) |
| 4376 | { |
| 4377 | if (!drv->bdrv_measure) { |
| 4378 | error_setg(errp, "Block driver '%s' does not support size measurement", |
| 4379 | drv->format_name); |
| 4380 | return NULL; |
| 4381 | } |
| 4382 | |
| 4383 | return drv->bdrv_measure(opts, in_bs, errp); |
| 4384 | } |
| 4385 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 4386 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4387 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4388 | */ |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4389 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4390 | { |
| 4391 | BlockDriver *drv = bs->drv; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4392 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4393 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4394 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 4395 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 4396 | if (drv->has_variable_length) { |
| 4397 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 4398 | if (ret < 0) { |
| 4399 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 4400 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4401 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4402 | return bs->total_sectors; |
| 4403 | } |
| 4404 | |
| 4405 | /** |
| 4406 | * Return length in bytes on success, -errno on error. |
| 4407 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 4408 | */ |
| 4409 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 4410 | { |
| 4411 | int64_t ret = bdrv_nb_sectors(bs); |
| 4412 | |
Fam Zheng | 4a9c9ea | 2015-05-15 16:36:05 +0800 | [diff] [blame] | 4413 | ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4414 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4415 | } |
| 4416 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4417 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 4418 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4419 | { |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 4420 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
| 4421 | |
| 4422 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4423 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 4424 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 4425 | bool bdrv_is_sg(BlockDriverState *bs) |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 4426 | { |
| 4427 | return bs->sg; |
| 4428 | } |
| 4429 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 4430 | bool bdrv_is_encrypted(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4431 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4432 | if (bs->backing && bs->backing->bs->encrypted) { |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 4433 | return true; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4434 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4435 | return bs->encrypted; |
| 4436 | } |
| 4437 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 4438 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4439 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 4440 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4441 | } |
| 4442 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 4443 | static int qsort_strcmp(const void *a, const void *b) |
| 4444 | { |
Max Reitz | ceff5bd | 2016-10-12 22:49:05 +0200 | [diff] [blame] | 4445 | return strcmp(*(char *const *)a, *(char *const *)b); |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 4446 | } |
| 4447 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4448 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 4449 | void *opaque, bool read_only) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4450 | { |
| 4451 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4452 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 4453 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4454 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4455 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 4456 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4457 | if (drv->format_name) { |
| 4458 | bool found = false; |
| 4459 | int i = count; |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 4460 | |
| 4461 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, read_only)) { |
| 4462 | continue; |
| 4463 | } |
| 4464 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4465 | while (formats && i && !found) { |
| 4466 | found = !strcmp(formats[--i], drv->format_name); |
| 4467 | } |
| 4468 | |
| 4469 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 4470 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4471 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4472 | } |
| 4473 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4474 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 4475 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 4476 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
| 4477 | const char *format_name = block_driver_modules[i].format_name; |
| 4478 | |
| 4479 | if (format_name) { |
| 4480 | bool found = false; |
| 4481 | int j = count; |
| 4482 | |
Andrey Shinkevich | 9ac404c | 2019-03-07 16:33:58 +0300 | [diff] [blame] | 4483 | if (use_bdrv_whitelist && |
| 4484 | !bdrv_format_is_whitelisted(format_name, read_only)) { |
| 4485 | continue; |
| 4486 | } |
| 4487 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 4488 | while (formats && j && !found) { |
| 4489 | found = !strcmp(formats[--j], format_name); |
| 4490 | } |
| 4491 | |
| 4492 | if (!found) { |
| 4493 | formats = g_renew(const char *, formats, count + 1); |
| 4494 | formats[count++] = format_name; |
| 4495 | } |
| 4496 | } |
| 4497 | } |
| 4498 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 4499 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 4500 | |
| 4501 | for (i = 0; i < count; i++) { |
| 4502 | it(opaque, formats[i]); |
| 4503 | } |
| 4504 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 4505 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4506 | } |
| 4507 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 4508 | /* This function is to find a node in the bs graph */ |
| 4509 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 4510 | { |
| 4511 | BlockDriverState *bs; |
| 4512 | |
| 4513 | assert(node_name); |
| 4514 | |
| 4515 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 4516 | if (!strcmp(node_name, bs->node_name)) { |
| 4517 | return bs; |
| 4518 | } |
| 4519 | } |
| 4520 | return NULL; |
| 4521 | } |
| 4522 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 4523 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 4524 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 4525 | { |
| 4526 | BlockDeviceInfoList *list, *entry; |
| 4527 | BlockDriverState *bs; |
| 4528 | |
| 4529 | list = NULL; |
| 4530 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Kevin Wolf | c83f9fb | 2016-03-03 11:37:48 +0100 | [diff] [blame] | 4531 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, errp); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 4532 | if (!info) { |
| 4533 | qapi_free_BlockDeviceInfoList(list); |
| 4534 | return NULL; |
| 4535 | } |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 4536 | entry = g_malloc0(sizeof(*entry)); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 4537 | entry->value = info; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 4538 | entry->next = list; |
| 4539 | list = entry; |
| 4540 | } |
| 4541 | |
| 4542 | return list; |
| 4543 | } |
| 4544 | |
Vladimir Sementsov-Ogievskiy | 5d3b4e9 | 2018-12-21 20:09:07 +0300 | [diff] [blame] | 4545 | #define QAPI_LIST_ADD(list, element) do { \ |
| 4546 | typeof(list) _tmp = g_new(typeof(*(list)), 1); \ |
| 4547 | _tmp->value = (element); \ |
| 4548 | _tmp->next = (list); \ |
| 4549 | (list) = _tmp; \ |
| 4550 | } while (0) |
| 4551 | |
| 4552 | typedef struct XDbgBlockGraphConstructor { |
| 4553 | XDbgBlockGraph *graph; |
| 4554 | GHashTable *graph_nodes; |
| 4555 | } XDbgBlockGraphConstructor; |
| 4556 | |
| 4557 | static XDbgBlockGraphConstructor *xdbg_graph_new(void) |
| 4558 | { |
| 4559 | XDbgBlockGraphConstructor *gr = g_new(XDbgBlockGraphConstructor, 1); |
| 4560 | |
| 4561 | gr->graph = g_new0(XDbgBlockGraph, 1); |
| 4562 | gr->graph_nodes = g_hash_table_new(NULL, NULL); |
| 4563 | |
| 4564 | return gr; |
| 4565 | } |
| 4566 | |
| 4567 | static XDbgBlockGraph *xdbg_graph_finalize(XDbgBlockGraphConstructor *gr) |
| 4568 | { |
| 4569 | XDbgBlockGraph *graph = gr->graph; |
| 4570 | |
| 4571 | g_hash_table_destroy(gr->graph_nodes); |
| 4572 | g_free(gr); |
| 4573 | |
| 4574 | return graph; |
| 4575 | } |
| 4576 | |
| 4577 | static uintptr_t xdbg_graph_node_num(XDbgBlockGraphConstructor *gr, void *node) |
| 4578 | { |
| 4579 | uintptr_t ret = (uintptr_t)g_hash_table_lookup(gr->graph_nodes, node); |
| 4580 | |
| 4581 | if (ret != 0) { |
| 4582 | return ret; |
| 4583 | } |
| 4584 | |
| 4585 | /* |
| 4586 | * Start counting from 1, not 0, because 0 interferes with not-found (NULL) |
| 4587 | * answer of g_hash_table_lookup. |
| 4588 | */ |
| 4589 | ret = g_hash_table_size(gr->graph_nodes) + 1; |
| 4590 | g_hash_table_insert(gr->graph_nodes, node, (void *)ret); |
| 4591 | |
| 4592 | return ret; |
| 4593 | } |
| 4594 | |
| 4595 | static void xdbg_graph_add_node(XDbgBlockGraphConstructor *gr, void *node, |
| 4596 | XDbgBlockGraphNodeType type, const char *name) |
| 4597 | { |
| 4598 | XDbgBlockGraphNode *n; |
| 4599 | |
| 4600 | n = g_new0(XDbgBlockGraphNode, 1); |
| 4601 | |
| 4602 | n->id = xdbg_graph_node_num(gr, node); |
| 4603 | n->type = type; |
| 4604 | n->name = g_strdup(name); |
| 4605 | |
| 4606 | QAPI_LIST_ADD(gr->graph->nodes, n); |
| 4607 | } |
| 4608 | |
| 4609 | static void xdbg_graph_add_edge(XDbgBlockGraphConstructor *gr, void *parent, |
| 4610 | const BdrvChild *child) |
| 4611 | { |
| 4612 | typedef struct { |
| 4613 | unsigned int flag; |
| 4614 | BlockPermission num; |
| 4615 | } PermissionMap; |
| 4616 | |
| 4617 | static const PermissionMap permissions[] = { |
| 4618 | { BLK_PERM_CONSISTENT_READ, BLOCK_PERMISSION_CONSISTENT_READ }, |
| 4619 | { BLK_PERM_WRITE, BLOCK_PERMISSION_WRITE }, |
| 4620 | { BLK_PERM_WRITE_UNCHANGED, BLOCK_PERMISSION_WRITE_UNCHANGED }, |
| 4621 | { BLK_PERM_RESIZE, BLOCK_PERMISSION_RESIZE }, |
| 4622 | { BLK_PERM_GRAPH_MOD, BLOCK_PERMISSION_GRAPH_MOD }, |
| 4623 | { 0, 0 } |
| 4624 | }; |
| 4625 | const PermissionMap *p; |
| 4626 | XDbgBlockGraphEdge *edge; |
| 4627 | |
| 4628 | QEMU_BUILD_BUG_ON(1UL << (ARRAY_SIZE(permissions) - 1) != BLK_PERM_ALL + 1); |
| 4629 | |
| 4630 | edge = g_new0(XDbgBlockGraphEdge, 1); |
| 4631 | |
| 4632 | edge->parent = xdbg_graph_node_num(gr, parent); |
| 4633 | edge->child = xdbg_graph_node_num(gr, child->bs); |
| 4634 | edge->name = g_strdup(child->name); |
| 4635 | |
| 4636 | for (p = permissions; p->flag; p++) { |
| 4637 | if (p->flag & child->perm) { |
| 4638 | QAPI_LIST_ADD(edge->perm, p->num); |
| 4639 | } |
| 4640 | if (p->flag & child->shared_perm) { |
| 4641 | QAPI_LIST_ADD(edge->shared_perm, p->num); |
| 4642 | } |
| 4643 | } |
| 4644 | |
| 4645 | QAPI_LIST_ADD(gr->graph->edges, edge); |
| 4646 | } |
| 4647 | |
| 4648 | |
| 4649 | XDbgBlockGraph *bdrv_get_xdbg_block_graph(Error **errp) |
| 4650 | { |
| 4651 | BlockBackend *blk; |
| 4652 | BlockJob *job; |
| 4653 | BlockDriverState *bs; |
| 4654 | BdrvChild *child; |
| 4655 | XDbgBlockGraphConstructor *gr = xdbg_graph_new(); |
| 4656 | |
| 4657 | for (blk = blk_all_next(NULL); blk; blk = blk_all_next(blk)) { |
| 4658 | char *allocated_name = NULL; |
| 4659 | const char *name = blk_name(blk); |
| 4660 | |
| 4661 | if (!*name) { |
| 4662 | name = allocated_name = blk_get_attached_dev_id(blk); |
| 4663 | } |
| 4664 | xdbg_graph_add_node(gr, blk, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_BACKEND, |
| 4665 | name); |
| 4666 | g_free(allocated_name); |
| 4667 | if (blk_root(blk)) { |
| 4668 | xdbg_graph_add_edge(gr, blk, blk_root(blk)); |
| 4669 | } |
| 4670 | } |
| 4671 | |
| 4672 | for (job = block_job_next(NULL); job; job = block_job_next(job)) { |
| 4673 | GSList *el; |
| 4674 | |
| 4675 | xdbg_graph_add_node(gr, job, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_JOB, |
| 4676 | job->job.id); |
| 4677 | for (el = job->nodes; el; el = el->next) { |
| 4678 | xdbg_graph_add_edge(gr, job, (BdrvChild *)el->data); |
| 4679 | } |
| 4680 | } |
| 4681 | |
| 4682 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 4683 | xdbg_graph_add_node(gr, bs, X_DBG_BLOCK_GRAPH_NODE_TYPE_BLOCK_DRIVER, |
| 4684 | bs->node_name); |
| 4685 | QLIST_FOREACH(child, &bs->children, next) { |
| 4686 | xdbg_graph_add_edge(gr, bs, child); |
| 4687 | } |
| 4688 | } |
| 4689 | |
| 4690 | return xdbg_graph_finalize(gr); |
| 4691 | } |
| 4692 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4693 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 4694 | const char *node_name, |
| 4695 | Error **errp) |
| 4696 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 4697 | BlockBackend *blk; |
| 4698 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4699 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4700 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 4701 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4702 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 4703 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 4704 | bs = blk_bs(blk); |
| 4705 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 4706 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 4707 | } |
| 4708 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 4709 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4710 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4711 | } |
| 4712 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 4713 | if (node_name) { |
| 4714 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4715 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 4716 | if (bs) { |
| 4717 | return bs; |
| 4718 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4719 | } |
| 4720 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 4721 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 4722 | device ? device : "", |
| 4723 | node_name ? node_name : ""); |
| 4724 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4725 | } |
| 4726 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 4727 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 4728 | * return false. If either argument is NULL, return false. */ |
| 4729 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 4730 | { |
| 4731 | while (top && top != base) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4732 | top = backing_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 4733 | } |
| 4734 | |
| 4735 | return top != NULL; |
| 4736 | } |
| 4737 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 4738 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 4739 | { |
| 4740 | if (!bs) { |
| 4741 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 4742 | } |
| 4743 | return QTAILQ_NEXT(bs, node_list); |
| 4744 | } |
| 4745 | |
Kevin Wolf | 0f12264 | 2018-03-28 18:29:18 +0200 | [diff] [blame] | 4746 | BlockDriverState *bdrv_next_all_states(BlockDriverState *bs) |
| 4747 | { |
| 4748 | if (!bs) { |
| 4749 | return QTAILQ_FIRST(&all_bdrv_states); |
| 4750 | } |
| 4751 | return QTAILQ_NEXT(bs, bs_list); |
| 4752 | } |
| 4753 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 4754 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 4755 | { |
| 4756 | return bs->node_name; |
| 4757 | } |
| 4758 | |
Kevin Wolf | 1f0c461 | 2016-03-22 18:38:44 +0100 | [diff] [blame] | 4759 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4760 | { |
| 4761 | BdrvChild *c; |
| 4762 | const char *name; |
| 4763 | |
| 4764 | /* If multiple parents have a name, just pick the first one. */ |
| 4765 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 4766 | if (c->role->get_name) { |
| 4767 | name = c->role->get_name(c); |
| 4768 | if (name && *name) { |
| 4769 | return name; |
| 4770 | } |
| 4771 | } |
| 4772 | } |
| 4773 | |
| 4774 | return NULL; |
| 4775 | } |
| 4776 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 4777 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 4778 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4779 | { |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4780 | return bdrv_get_parent_name(bs) ?: ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4781 | } |
| 4782 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 4783 | /* This can be used to identify nodes that might not have a device |
| 4784 | * name associated. Since node and device names live in the same |
| 4785 | * namespace, the result is unambiguous. The exception is if both are |
| 4786 | * absent, then this returns an empty (non-null) string. */ |
| 4787 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 4788 | { |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4789 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 4790 | } |
| 4791 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 4792 | int bdrv_get_flags(BlockDriverState *bs) |
| 4793 | { |
| 4794 | return bs->open_flags; |
| 4795 | } |
| 4796 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 4797 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 4798 | { |
| 4799 | return 1; |
| 4800 | } |
| 4801 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4802 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 4803 | { |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 4804 | if (!bs->drv) { |
| 4805 | return 0; |
| 4806 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4807 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 4808 | /* If BS is a copy on write image, it is initialized to |
| 4809 | the contents of the base image, which may not be zeroes. */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4810 | if (bs->backing) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 4811 | return 0; |
| 4812 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 4813 | if (bs->drv->bdrv_has_zero_init) { |
| 4814 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4815 | } |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4816 | if (bs->file && bs->drv->is_filter) { |
| 4817 | return bdrv_has_zero_init(bs->file->bs); |
| 4818 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4819 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 4820 | /* safe default */ |
| 4821 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4822 | } |
| 4823 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4824 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 4825 | { |
| 4826 | BlockDriverInfo bdi; |
| 4827 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4828 | if (bs->backing) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4829 | return false; |
| 4830 | } |
| 4831 | |
| 4832 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 4833 | return bdi.unallocated_blocks_are_zero; |
| 4834 | } |
| 4835 | |
| 4836 | return false; |
| 4837 | } |
| 4838 | |
| 4839 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 4840 | { |
Denis V. Lunev | 2f0342e | 2016-07-14 16:33:26 +0300 | [diff] [blame] | 4841 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4842 | return false; |
| 4843 | } |
| 4844 | |
Eric Blake | e24d813 | 2018-01-26 13:34:39 -0600 | [diff] [blame] | 4845 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4846 | } |
| 4847 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4848 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4849 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4850 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 4851 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4852 | } |
| 4853 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4854 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 4855 | { |
| 4856 | BlockDriver *drv = bs->drv; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4857 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
| 4858 | if (!drv) { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4859 | return -ENOMEDIUM; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4860 | } |
| 4861 | if (!drv->bdrv_get_info) { |
| 4862 | if (bs->file && drv->is_filter) { |
| 4863 | return bdrv_get_info(bs->file->bs, bdi); |
| 4864 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4865 | return -ENOTSUP; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4866 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4867 | memset(bdi, 0, sizeof(*bdi)); |
| 4868 | return drv->bdrv_get_info(bs, bdi); |
| 4869 | } |
| 4870 | |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 4871 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs, |
| 4872 | Error **errp) |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 4873 | { |
| 4874 | BlockDriver *drv = bs->drv; |
| 4875 | if (drv && drv->bdrv_get_specific_info) { |
Andrey Shinkevich | 1bf6e9c | 2019-02-08 18:06:06 +0300 | [diff] [blame] | 4876 | return drv->bdrv_get_specific_info(bs, errp); |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 4877 | } |
| 4878 | return NULL; |
| 4879 | } |
| 4880 | |
Eric Blake | a31939e | 2015-11-18 01:52:54 -0700 | [diff] [blame] | 4881 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4882 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4883 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4884 | return; |
| 4885 | } |
| 4886 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4887 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4888 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4889 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4890 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 4891 | const char *tag) |
| 4892 | { |
| 4893 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4894 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4895 | } |
| 4896 | |
| 4897 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 4898 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 4899 | } |
| 4900 | |
| 4901 | return -ENOTSUP; |
| 4902 | } |
| 4903 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4904 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 4905 | { |
| 4906 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4907 | bs = bs->file ? bs->file->bs : NULL; |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4908 | } |
| 4909 | |
| 4910 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 4911 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 4912 | } |
| 4913 | |
| 4914 | return -ENOTSUP; |
| 4915 | } |
| 4916 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4917 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 4918 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 4919 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4920 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4921 | } |
| 4922 | |
| 4923 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 4924 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 4925 | } |
| 4926 | |
| 4927 | return -ENOTSUP; |
| 4928 | } |
| 4929 | |
| 4930 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 4931 | { |
| 4932 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4933 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4934 | } |
| 4935 | |
| 4936 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 4937 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 4938 | } |
| 4939 | |
| 4940 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4941 | } |
| 4942 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4943 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 4944 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 4945 | * from a BDS as backing_file should not be done, as that may be relative to |
| 4946 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4947 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 4948 | const char *backing_file) |
| 4949 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4950 | char *filename_full = NULL; |
| 4951 | char *backing_file_full = NULL; |
| 4952 | char *filename_tmp = NULL; |
| 4953 | int is_protocol = 0; |
| 4954 | BlockDriverState *curr_bs = NULL; |
| 4955 | BlockDriverState *retval = NULL; |
| 4956 | |
| 4957 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4958 | return NULL; |
| 4959 | } |
| 4960 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4961 | filename_full = g_malloc(PATH_MAX); |
| 4962 | backing_file_full = g_malloc(PATH_MAX); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4963 | |
| 4964 | is_protocol = path_has_protocol(backing_file); |
| 4965 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4966 | for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4967 | |
| 4968 | /* If either of the filename paths is actually a protocol, then |
| 4969 | * compare unmodified paths; otherwise make paths relative */ |
| 4970 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 4971 | char *backing_file_full_ret; |
| 4972 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4973 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4974 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4975 | break; |
| 4976 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 4977 | /* Also check against the full backing filename for the image */ |
Max Reitz | 6b6833c | 2019-02-01 20:29:15 +0100 | [diff] [blame] | 4978 | backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs, |
| 4979 | NULL); |
| 4980 | if (backing_file_full_ret) { |
| 4981 | bool equal = strcmp(backing_file, backing_file_full_ret) == 0; |
| 4982 | g_free(backing_file_full_ret); |
| 4983 | if (equal) { |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 4984 | retval = curr_bs->backing->bs; |
| 4985 | break; |
| 4986 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 4987 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4988 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4989 | /* If not an absolute filename path, make it relative to the current |
| 4990 | * image's filename path */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 4991 | filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file, |
| 4992 | NULL); |
| 4993 | /* We are going to compare canonicalized absolute pathnames */ |
| 4994 | if (!filename_tmp || !realpath(filename_tmp, filename_full)) { |
| 4995 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4996 | continue; |
| 4997 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 4998 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4999 | |
| 5000 | /* We need to make sure the backing filename we are comparing against |
| 5001 | * is relative to the current image filename (or absolute) */ |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 5002 | filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL); |
| 5003 | if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) { |
| 5004 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 5005 | continue; |
| 5006 | } |
Max Reitz | 2d9158c | 2019-02-01 20:29:17 +0100 | [diff] [blame] | 5007 | g_free(filename_tmp); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 5008 | |
| 5009 | if (strcmp(backing_file_full, filename_full) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 5010 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 5011 | break; |
| 5012 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 5013 | } |
| 5014 | } |
| 5015 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 5016 | g_free(filename_full); |
| 5017 | g_free(backing_file_full); |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 5018 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 5019 | } |
| 5020 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 5021 | void bdrv_init(void) |
| 5022 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 5023 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 5024 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 5025 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 5026 | void bdrv_init_with_whitelist(void) |
| 5027 | { |
| 5028 | use_bdrv_whitelist = 1; |
| 5029 | bdrv_init(); |
| 5030 | } |
| 5031 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5032 | static void coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, |
| 5033 | Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5034 | { |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 5035 | BdrvChild *child, *parent; |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 5036 | uint64_t perm, shared_perm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5037 | Error *local_err = NULL; |
| 5038 | int ret; |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 5039 | BdrvDirtyBitmap *bm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5040 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5041 | if (!bs->drv) { |
| 5042 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5043 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5044 | |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 5045 | if (!(bs->open_flags & BDRV_O_INACTIVE)) { |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 5046 | return; |
| 5047 | } |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 5048 | |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 5049 | QLIST_FOREACH(child, &bs->children, next) { |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5050 | bdrv_co_invalidate_cache(child->bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 5051 | if (local_err) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 5052 | error_propagate(errp, local_err); |
| 5053 | return; |
| 5054 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5055 | } |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 5056 | |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 5057 | /* |
| 5058 | * Update permissions, they may differ for inactive nodes. |
| 5059 | * |
| 5060 | * Note that the required permissions of inactive images are always a |
| 5061 | * subset of the permissions required after activating the image. This |
| 5062 | * allows us to just get the permissions upfront without restricting |
| 5063 | * drv->bdrv_invalidate_cache(). |
| 5064 | * |
| 5065 | * It also means that in error cases, we don't have to try and revert to |
| 5066 | * the old permissions (which is an operation that could fail, too). We can |
| 5067 | * just keep the extended permissions for the next time that an activation |
| 5068 | * of the image is tried. |
| 5069 | */ |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 5070 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 5071 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); |
| 5072 | ret = bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, &local_err); |
| 5073 | if (ret < 0) { |
| 5074 | bs->open_flags |= BDRV_O_INACTIVE; |
| 5075 | error_propagate(errp, local_err); |
| 5076 | return; |
| 5077 | } |
| 5078 | bdrv_set_perm(bs, perm, shared_perm); |
| 5079 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5080 | if (bs->drv->bdrv_co_invalidate_cache) { |
| 5081 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 5082 | if (local_err) { |
| 5083 | bs->open_flags |= BDRV_O_INACTIVE; |
| 5084 | error_propagate(errp, local_err); |
| 5085 | return; |
| 5086 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 5087 | } |
| 5088 | |
Vladimir Sementsov-Ogievskiy | 9c98f14 | 2018-10-29 16:23:17 -0400 | [diff] [blame] | 5089 | for (bm = bdrv_dirty_bitmap_next(bs, NULL); bm; |
| 5090 | bm = bdrv_dirty_bitmap_next(bs, bm)) |
| 5091 | { |
| 5092 | bdrv_dirty_bitmap_set_migration(bm, false); |
| 5093 | } |
| 5094 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5095 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 5096 | if (ret < 0) { |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 5097 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5098 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 5099 | return; |
| 5100 | } |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 5101 | |
| 5102 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
| 5103 | if (parent->role->activate) { |
| 5104 | parent->role->activate(parent, &local_err); |
| 5105 | if (local_err) { |
Kevin Wolf | 78fc3b3 | 2019-01-31 15:16:10 +0100 | [diff] [blame] | 5106 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 5107 | error_propagate(errp, local_err); |
| 5108 | return; |
| 5109 | } |
| 5110 | } |
| 5111 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5112 | } |
| 5113 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5114 | typedef struct InvalidateCacheCo { |
| 5115 | BlockDriverState *bs; |
| 5116 | Error **errp; |
| 5117 | bool done; |
| 5118 | } InvalidateCacheCo; |
| 5119 | |
| 5120 | static void coroutine_fn bdrv_invalidate_cache_co_entry(void *opaque) |
| 5121 | { |
| 5122 | InvalidateCacheCo *ico = opaque; |
| 5123 | bdrv_co_invalidate_cache(ico->bs, ico->errp); |
| 5124 | ico->done = true; |
Kevin Wolf | 4720cbe | 2019-01-07 13:02:48 +0100 | [diff] [blame] | 5125 | aio_wait_kick(); |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5126 | } |
| 5127 | |
| 5128 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
| 5129 | { |
| 5130 | Coroutine *co; |
| 5131 | InvalidateCacheCo ico = { |
| 5132 | .bs = bs, |
| 5133 | .done = false, |
| 5134 | .errp = errp |
| 5135 | }; |
| 5136 | |
| 5137 | if (qemu_in_coroutine()) { |
| 5138 | /* Fast-path if already in coroutine context */ |
| 5139 | bdrv_invalidate_cache_co_entry(&ico); |
| 5140 | } else { |
| 5141 | co = qemu_coroutine_create(bdrv_invalidate_cache_co_entry, &ico); |
Kevin Wolf | 4720cbe | 2019-01-07 13:02:48 +0100 | [diff] [blame] | 5142 | bdrv_coroutine_enter(bs, co); |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 5143 | BDRV_POLL_WHILE(bs, !ico.done); |
| 5144 | } |
| 5145 | } |
| 5146 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5147 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5148 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 5149 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5150 | Error *local_err = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5151 | BdrvNextIterator it; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5152 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5153 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5154 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5155 | |
| 5156 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5157 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 5158 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5159 | if (local_err) { |
| 5160 | error_propagate(errp, local_err); |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 5161 | bdrv_next_cleanup(&it); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 5162 | return; |
| 5163 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 5164 | } |
| 5165 | } |
| 5166 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5167 | static bool bdrv_has_bds_parent(BlockDriverState *bs, bool only_active) |
| 5168 | { |
| 5169 | BdrvChild *parent; |
| 5170 | |
| 5171 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
| 5172 | if (parent->role->parent_is_bds) { |
| 5173 | BlockDriverState *parent_bs = parent->opaque; |
| 5174 | if (!only_active || !(parent_bs->open_flags & BDRV_O_INACTIVE)) { |
| 5175 | return true; |
| 5176 | } |
| 5177 | } |
| 5178 | } |
| 5179 | |
| 5180 | return false; |
| 5181 | } |
| 5182 | |
| 5183 | static int bdrv_inactivate_recurse(BlockDriverState *bs) |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5184 | { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 5185 | BdrvChild *child, *parent; |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5186 | uint64_t perm, shared_perm; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5187 | int ret; |
| 5188 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5189 | if (!bs->drv) { |
| 5190 | return -ENOMEDIUM; |
| 5191 | } |
| 5192 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5193 | /* Make sure that we don't inactivate a child before its parent. |
| 5194 | * It will be covered by recursion from the yet active parent. */ |
| 5195 | if (bdrv_has_bds_parent(bs, true)) { |
| 5196 | return 0; |
| 5197 | } |
| 5198 | |
| 5199 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
| 5200 | |
| 5201 | /* Inactivate this node */ |
| 5202 | if (bs->drv->bdrv_inactivate) { |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5203 | ret = bs->drv->bdrv_inactivate(bs); |
| 5204 | if (ret < 0) { |
| 5205 | return ret; |
| 5206 | } |
| 5207 | } |
| 5208 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5209 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
| 5210 | if (parent->role->inactivate) { |
| 5211 | ret = parent->role->inactivate(parent); |
| 5212 | if (ret < 0) { |
| 5213 | return ret; |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 5214 | } |
| 5215 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5216 | } |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 5217 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5218 | bs->open_flags |= BDRV_O_INACTIVE; |
| 5219 | |
| 5220 | /* Update permissions, they may differ for inactive nodes */ |
| 5221 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); |
| 5222 | bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, &error_abort); |
| 5223 | bdrv_set_perm(bs, perm, shared_perm); |
| 5224 | |
| 5225 | |
| 5226 | /* Recursively inactivate children */ |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 5227 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5228 | ret = bdrv_inactivate_recurse(child->bs); |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 5229 | if (ret < 0) { |
| 5230 | return ret; |
| 5231 | } |
| 5232 | } |
| 5233 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5234 | return 0; |
| 5235 | } |
| 5236 | |
| 5237 | int bdrv_inactivate_all(void) |
| 5238 | { |
Max Reitz | 79720af | 2016-03-16 19:54:44 +0100 | [diff] [blame] | 5239 | BlockDriverState *bs = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5240 | BdrvNextIterator it; |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5241 | int ret = 0; |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 5242 | GSList *aio_ctxs = NULL, *ctx; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5243 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5244 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 5245 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5246 | |
| 5247 | if (!g_slist_find(aio_ctxs, aio_context)) { |
| 5248 | aio_ctxs = g_slist_prepend(aio_ctxs, aio_context); |
| 5249 | aio_context_acquire(aio_context); |
| 5250 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5251 | } |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5252 | |
Kevin Wolf | 9e37271 | 2018-11-23 15:11:14 +0100 | [diff] [blame] | 5253 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
| 5254 | /* Nodes with BDS parents are covered by recursion from the last |
| 5255 | * parent that gets inactivated. Don't inactivate them a second |
| 5256 | * time if that has already happened. */ |
| 5257 | if (bdrv_has_bds_parent(bs, false)) { |
| 5258 | continue; |
| 5259 | } |
| 5260 | ret = bdrv_inactivate_recurse(bs); |
| 5261 | if (ret < 0) { |
| 5262 | bdrv_next_cleanup(&it); |
| 5263 | goto out; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5264 | } |
| 5265 | } |
| 5266 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5267 | out: |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 5268 | for (ctx = aio_ctxs; ctx != NULL; ctx = ctx->next) { |
| 5269 | AioContext *aio_context = ctx->data; |
| 5270 | aio_context_release(aio_context); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5271 | } |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 5272 | g_slist_free(aio_ctxs); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 5273 | |
| 5274 | return ret; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 5275 | } |
| 5276 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 5277 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5278 | /* removable device support */ |
| 5279 | |
| 5280 | /** |
| 5281 | * Return TRUE if the media is present |
| 5282 | */ |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 5283 | bool bdrv_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5284 | { |
| 5285 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 5286 | BdrvChild *child; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 5287 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 5288 | if (!drv) { |
| 5289 | return false; |
| 5290 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 5291 | if (drv->bdrv_is_inserted) { |
| 5292 | return drv->bdrv_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 5293 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 5294 | QLIST_FOREACH(child, &bs->children, next) { |
| 5295 | if (!bdrv_is_inserted(child->bs)) { |
| 5296 | return false; |
| 5297 | } |
| 5298 | } |
| 5299 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5300 | } |
| 5301 | |
| 5302 | /** |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5303 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 5304 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 5305 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5306 | { |
| 5307 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5308 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 5309 | if (drv && drv->bdrv_eject) { |
| 5310 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5311 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5312 | } |
| 5313 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5314 | /** |
| 5315 | * Lock or unlock the media (if it is locked, the user won't be able |
| 5316 | * to eject it manually). |
| 5317 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5318 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5319 | { |
| 5320 | BlockDriver *drv = bs->drv; |
| 5321 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5322 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 5323 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5324 | if (drv && drv->bdrv_lock_medium) { |
| 5325 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5326 | } |
| 5327 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 5328 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 5329 | /* Get a reference to bs */ |
| 5330 | void bdrv_ref(BlockDriverState *bs) |
| 5331 | { |
| 5332 | bs->refcnt++; |
| 5333 | } |
| 5334 | |
| 5335 | /* Release a previously grabbed reference to bs. |
| 5336 | * If after releasing, reference count is zero, the BlockDriverState is |
| 5337 | * deleted. */ |
| 5338 | void bdrv_unref(BlockDriverState *bs) |
| 5339 | { |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 5340 | if (!bs) { |
| 5341 | return; |
| 5342 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 5343 | assert(bs->refcnt > 0); |
| 5344 | if (--bs->refcnt == 0) { |
| 5345 | bdrv_delete(bs); |
| 5346 | } |
| 5347 | } |
| 5348 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5349 | struct BdrvOpBlocker { |
| 5350 | Error *reason; |
| 5351 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 5352 | }; |
| 5353 | |
| 5354 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 5355 | { |
| 5356 | BdrvOpBlocker *blocker; |
| 5357 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5358 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 5359 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
Markus Armbruster | 4b57664 | 2018-10-17 10:26:25 +0200 | [diff] [blame] | 5360 | error_propagate_prepend(errp, error_copy(blocker->reason), |
| 5361 | "Node '%s' is busy: ", |
| 5362 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5363 | return true; |
| 5364 | } |
| 5365 | return false; |
| 5366 | } |
| 5367 | |
| 5368 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5369 | { |
| 5370 | BdrvOpBlocker *blocker; |
| 5371 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5372 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 5373 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5374 | blocker->reason = reason; |
| 5375 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 5376 | } |
| 5377 | |
| 5378 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5379 | { |
| 5380 | BdrvOpBlocker *blocker, *next; |
| 5381 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5382 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 5383 | if (blocker->reason == reason) { |
| 5384 | QLIST_REMOVE(blocker, list); |
| 5385 | g_free(blocker); |
| 5386 | } |
| 5387 | } |
| 5388 | } |
| 5389 | |
| 5390 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 5391 | { |
| 5392 | int i; |
| 5393 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5394 | bdrv_op_block(bs, i, reason); |
| 5395 | } |
| 5396 | } |
| 5397 | |
| 5398 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 5399 | { |
| 5400 | int i; |
| 5401 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5402 | bdrv_op_unblock(bs, i, reason); |
| 5403 | } |
| 5404 | } |
| 5405 | |
| 5406 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 5407 | { |
| 5408 | int i; |
| 5409 | |
| 5410 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5411 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 5412 | return false; |
| 5413 | } |
| 5414 | } |
| 5415 | return true; |
| 5416 | } |
| 5417 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5418 | void bdrv_img_create(const char *filename, const char *fmt, |
| 5419 | const char *base_filename, const char *base_fmt, |
Fam Zheng | 9217283 | 2017-04-21 20:27:01 +0800 | [diff] [blame] | 5420 | char *options, uint64_t img_size, int flags, bool quiet, |
| 5421 | Error **errp) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5422 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5423 | QemuOptsList *create_opts = NULL; |
| 5424 | QemuOpts *opts = NULL; |
| 5425 | const char *backing_fmt, *backing_file; |
| 5426 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5427 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5428 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5429 | int ret = 0; |
| 5430 | |
| 5431 | /* Find driver and parse its options */ |
| 5432 | drv = bdrv_find_format(fmt); |
| 5433 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5434 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5435 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5436 | } |
| 5437 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 5438 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5439 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5440 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5441 | } |
| 5442 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 5443 | if (!drv->create_opts) { |
| 5444 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 5445 | drv->format_name); |
| 5446 | return; |
| 5447 | } |
| 5448 | |
| 5449 | if (!proto_drv->create_opts) { |
| 5450 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 5451 | proto_drv->format_name); |
| 5452 | return; |
| 5453 | } |
| 5454 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5455 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 5456 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5457 | |
| 5458 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5459 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 5460 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5461 | |
| 5462 | /* Parse -o options */ |
| 5463 | if (options) { |
Markus Armbruster | dc523cd34 | 2015-02-12 18:37:11 +0100 | [diff] [blame] | 5464 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
| 5465 | if (local_err) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5466 | goto out; |
| 5467 | } |
| 5468 | } |
| 5469 | |
| 5470 | if (base_filename) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 5471 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 5472 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5473 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 5474 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5475 | goto out; |
| 5476 | } |
| 5477 | } |
| 5478 | |
| 5479 | if (base_fmt) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 5480 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 5481 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5482 | error_setg(errp, "Backing file format not supported for file " |
| 5483 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5484 | goto out; |
| 5485 | } |
| 5486 | } |
| 5487 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5488 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 5489 | if (backing_file) { |
| 5490 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5491 | error_setg(errp, "Error: Trying to create an image with the " |
| 5492 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 5493 | goto out; |
| 5494 | } |
| 5495 | } |
| 5496 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5497 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5498 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5499 | /* The size for the image must always be specified, unless we have a backing |
| 5500 | * file and we have not been forbidden from opening it. */ |
Eric Blake | a8b42a1 | 2017-09-25 09:55:07 -0500 | [diff] [blame] | 5501 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5502 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
| 5503 | BlockDriverState *bs; |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 5504 | char *full_backing; |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5505 | int back_flags; |
| 5506 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 5507 | |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 5508 | full_backing = |
| 5509 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 5510 | &local_err); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5511 | if (local_err) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5512 | goto out; |
| 5513 | } |
Max Reitz | 645ae7d | 2019-02-01 20:29:14 +0100 | [diff] [blame] | 5514 | assert(full_backing); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5515 | |
| 5516 | /* backing files always opened read-only */ |
| 5517 | back_flags = flags; |
| 5518 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 5519 | |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 5520 | backing_options = qdict_new(); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5521 | if (backing_fmt) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5522 | qdict_put_str(backing_options, "driver", backing_fmt); |
| 5523 | } |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 5524 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 5525 | |
| 5526 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
| 5527 | &local_err); |
| 5528 | g_free(full_backing); |
| 5529 | if (!bs && size != -1) { |
| 5530 | /* Couldn't open BS, but we have a size, so it's nonfatal */ |
| 5531 | warn_reportf_err(local_err, |
| 5532 | "Could not verify backing image. " |
| 5533 | "This may become an error in future versions.\n"); |
| 5534 | local_err = NULL; |
| 5535 | } else if (!bs) { |
| 5536 | /* Couldn't open bs, do not have size */ |
| 5537 | error_append_hint(&local_err, |
| 5538 | "Could not open backing image to determine size.\n"); |
| 5539 | goto out; |
| 5540 | } else { |
| 5541 | if (size == -1) { |
| 5542 | /* Opened BS, have no size */ |
| 5543 | size = bdrv_getlength(bs); |
| 5544 | if (size < 0) { |
| 5545 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 5546 | backing_file); |
| 5547 | bdrv_unref(bs); |
| 5548 | goto out; |
| 5549 | } |
| 5550 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
| 5551 | } |
| 5552 | bdrv_unref(bs); |
| 5553 | } |
| 5554 | } /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
| 5555 | |
| 5556 | if (size == -1) { |
| 5557 | error_setg(errp, "Image creation needs a size parameter"); |
| 5558 | goto out; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5559 | } |
| 5560 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5561 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 5562 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 5563 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5564 | puts(""); |
| 5565 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5566 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5567 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5568 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5569 | if (ret == -EFBIG) { |
| 5570 | /* This is generally a better message than whatever the driver would |
| 5571 | * deliver (especially because of the cluster_size_hint), since that |
| 5572 | * is most probably not much different from "image too large". */ |
| 5573 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5574 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5575 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5576 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5577 | error_setg(errp, "The image size is too large for file format '%s'" |
| 5578 | "%s", fmt, cluster_size_hint); |
| 5579 | error_free(local_err); |
| 5580 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5581 | } |
| 5582 | |
| 5583 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5584 | qemu_opts_del(opts); |
| 5585 | qemu_opts_free(create_opts); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 5586 | error_propagate(errp, local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5587 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5588 | |
| 5589 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 5590 | { |
Stefan Hajnoczi | 33f2a75 | 2018-02-16 16:50:13 +0000 | [diff] [blame] | 5591 | return bs ? bs->aio_context : qemu_get_aio_context(); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5592 | } |
| 5593 | |
Fam Zheng | 052a757 | 2017-04-10 20:09:25 +0800 | [diff] [blame] | 5594 | void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co) |
| 5595 | { |
| 5596 | aio_co_enter(bdrv_get_aio_context(bs), co); |
| 5597 | } |
| 5598 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5599 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
| 5600 | { |
| 5601 | QLIST_REMOVE(ban, list); |
| 5602 | g_free(ban); |
| 5603 | } |
| 5604 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5605 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 5606 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5607 | BdrvAioNotifier *baf, *baf_tmp; |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 5608 | BdrvChild *child; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5609 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5610 | if (!bs->drv) { |
| 5611 | return; |
| 5612 | } |
| 5613 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5614 | assert(!bs->walking_aio_notifiers); |
| 5615 | bs->walking_aio_notifiers = true; |
| 5616 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { |
| 5617 | if (baf->deleted) { |
| 5618 | bdrv_do_remove_aio_context_notifier(baf); |
| 5619 | } else { |
| 5620 | baf->detach_aio_context(baf->opaque); |
| 5621 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5622 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5623 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
| 5624 | * remove remaining aio notifiers if we aren't called again. |
| 5625 | */ |
| 5626 | bs->walking_aio_notifiers = false; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5627 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5628 | if (bs->drv->bdrv_detach_aio_context) { |
| 5629 | bs->drv->bdrv_detach_aio_context(bs); |
| 5630 | } |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 5631 | QLIST_FOREACH(child, &bs->children, next) { |
| 5632 | bdrv_detach_aio_context(child->bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5633 | } |
| 5634 | |
Kevin Wolf | e64f25f | 2019-02-08 16:51:17 +0100 | [diff] [blame] | 5635 | if (bs->quiesce_counter) { |
| 5636 | aio_enable_external(bs->aio_context); |
| 5637 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5638 | bs->aio_context = NULL; |
| 5639 | } |
| 5640 | |
| 5641 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 5642 | AioContext *new_context) |
| 5643 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5644 | BdrvAioNotifier *ban, *ban_tmp; |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 5645 | BdrvChild *child; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5646 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5647 | if (!bs->drv) { |
| 5648 | return; |
| 5649 | } |
| 5650 | |
Kevin Wolf | e64f25f | 2019-02-08 16:51:17 +0100 | [diff] [blame] | 5651 | if (bs->quiesce_counter) { |
| 5652 | aio_disable_external(new_context); |
| 5653 | } |
| 5654 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5655 | bs->aio_context = new_context; |
| 5656 | |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 5657 | QLIST_FOREACH(child, &bs->children, next) { |
| 5658 | bdrv_attach_aio_context(child->bs, new_context); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5659 | } |
| 5660 | if (bs->drv->bdrv_attach_aio_context) { |
| 5661 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 5662 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5663 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5664 | assert(!bs->walking_aio_notifiers); |
| 5665 | bs->walking_aio_notifiers = true; |
| 5666 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { |
| 5667 | if (ban->deleted) { |
| 5668 | bdrv_do_remove_aio_context_notifier(ban); |
| 5669 | } else { |
| 5670 | ban->attached_aio_context(new_context, ban->opaque); |
| 5671 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5672 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5673 | bs->walking_aio_notifiers = false; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5674 | } |
| 5675 | |
Kevin Wolf | d70d595 | 2019-02-08 16:53:37 +0100 | [diff] [blame] | 5676 | /* The caller must own the AioContext lock for the old AioContext of bs, but it |
| 5677 | * must not own the AioContext lock for new_context (unless new_context is |
| 5678 | * the same as the current context of bs). */ |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5679 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 5680 | { |
Kevin Wolf | d70d595 | 2019-02-08 16:53:37 +0100 | [diff] [blame] | 5681 | if (bdrv_get_aio_context(bs) == new_context) { |
Denis Plotnikov | 57830a4 | 2019-02-15 16:03:25 +0300 | [diff] [blame] | 5682 | return; |
| 5683 | } |
| 5684 | |
Kevin Wolf | d70d595 | 2019-02-08 16:53:37 +0100 | [diff] [blame] | 5685 | bdrv_drained_begin(bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5686 | bdrv_detach_aio_context(bs); |
| 5687 | |
| 5688 | /* This function executes in the old AioContext so acquire the new one in |
| 5689 | * case it runs in a different thread. |
| 5690 | */ |
| 5691 | aio_context_acquire(new_context); |
| 5692 | bdrv_attach_aio_context(bs, new_context); |
Kevin Wolf | d70d595 | 2019-02-08 16:53:37 +0100 | [diff] [blame] | 5693 | bdrv_drained_end(bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5694 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5695 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 5696 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5697 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 5698 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 5699 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 5700 | { |
| 5701 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 5702 | *ban = (BdrvAioNotifier){ |
| 5703 | .attached_aio_context = attached_aio_context, |
| 5704 | .detach_aio_context = detach_aio_context, |
| 5705 | .opaque = opaque |
| 5706 | }; |
| 5707 | |
| 5708 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 5709 | } |
| 5710 | |
| 5711 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 5712 | void (*attached_aio_context)(AioContext *, |
| 5713 | void *), |
| 5714 | void (*detach_aio_context)(void *), |
| 5715 | void *opaque) |
| 5716 | { |
| 5717 | BdrvAioNotifier *ban, *ban_next; |
| 5718 | |
| 5719 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 5720 | if (ban->attached_aio_context == attached_aio_context && |
| 5721 | ban->detach_aio_context == detach_aio_context && |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5722 | ban->opaque == opaque && |
| 5723 | ban->deleted == false) |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5724 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 5725 | if (bs->walking_aio_notifiers) { |
| 5726 | ban->deleted = true; |
| 5727 | } else { |
| 5728 | bdrv_do_remove_aio_context_notifier(ban); |
| 5729 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 5730 | return; |
| 5731 | } |
| 5732 | } |
| 5733 | |
| 5734 | abort(); |
| 5735 | } |
| 5736 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 5737 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5738 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
| 5739 | Error **errp) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5740 | { |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5741 | if (!bs->drv) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5742 | error_setg(errp, "Node is ejected"); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5743 | return -ENOMEDIUM; |
| 5744 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5745 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5746 | error_setg(errp, "Block driver '%s' does not support option amendment", |
| 5747 | bs->drv->format_name); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5748 | return -ENOTSUP; |
| 5749 | } |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame] | 5750 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, cb_opaque, errp); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5751 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5752 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5753 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 5754 | * of block filter and by bdrv_is_first_non_filter. |
| 5755 | * It is used to test if the given bs is the candidate or recurse more in the |
| 5756 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5757 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5758 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 5759 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5760 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5761 | /* return false if basic checks fails */ |
| 5762 | if (!bs || !bs->drv) { |
| 5763 | return false; |
| 5764 | } |
| 5765 | |
| 5766 | /* the code reached a non block filter driver -> check if the bs is |
| 5767 | * the same as the candidate. It's the recursion termination condition. |
| 5768 | */ |
| 5769 | if (!bs->drv->is_filter) { |
| 5770 | return bs == candidate; |
| 5771 | } |
| 5772 | /* Down this path the driver is a block filter driver */ |
| 5773 | |
| 5774 | /* If the block filter recursion method is defined use it to recurse down |
| 5775 | * the node graph. |
| 5776 | */ |
| 5777 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5778 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 5779 | } |
| 5780 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5781 | /* the driver is a block filter but don't allow to recurse -> return false |
| 5782 | */ |
| 5783 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5784 | } |
| 5785 | |
| 5786 | /* This function checks if the candidate is the first non filter bs down it's |
| 5787 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 5788 | * from the top. Some filters can choose not to pass down the recursion. |
| 5789 | */ |
| 5790 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 5791 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 5792 | BlockDriverState *bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5793 | BdrvNextIterator it; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5794 | |
| 5795 | /* walk down the bs forest recursively */ |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5796 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5797 | bool perm; |
| 5798 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5799 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 5800 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5801 | |
| 5802 | /* candidate is the first non filter */ |
| 5803 | if (perm) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 5804 | bdrv_next_cleanup(&it); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5805 | return true; |
| 5806 | } |
| 5807 | } |
| 5808 | |
| 5809 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5810 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5811 | |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 5812 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 5813 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5814 | { |
| 5815 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5816 | AioContext *aio_context; |
| 5817 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5818 | if (!to_replace_bs) { |
| 5819 | error_setg(errp, "Node name '%s' not found", node_name); |
| 5820 | return NULL; |
| 5821 | } |
| 5822 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5823 | aio_context = bdrv_get_aio_context(to_replace_bs); |
| 5824 | aio_context_acquire(aio_context); |
| 5825 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5826 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5827 | to_replace_bs = NULL; |
| 5828 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5829 | } |
| 5830 | |
| 5831 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 5832 | * most non filter in order to prevent data corruption. |
| 5833 | * Another benefit is that this tests exclude backing files which are |
| 5834 | * blocked by the backing blockers. |
| 5835 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 5836 | if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5837 | error_setg(errp, "Only top most non filter can be replaced"); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5838 | to_replace_bs = NULL; |
| 5839 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5840 | } |
| 5841 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5842 | out: |
| 5843 | aio_context_release(aio_context); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5844 | return to_replace_bs; |
| 5845 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 5846 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 5847 | /** |
| 5848 | * Iterates through the list of runtime option keys that are said to |
| 5849 | * be "strong" for a BDS. An option is called "strong" if it changes |
| 5850 | * a BDS's data. For example, the null block driver's "size" and |
| 5851 | * "read-zeroes" options are strong, but its "latency-ns" option is |
| 5852 | * not. |
| 5853 | * |
| 5854 | * If a key returned by this function ends with a dot, all options |
| 5855 | * starting with that prefix are strong. |
| 5856 | */ |
| 5857 | static const char *const *strong_options(BlockDriverState *bs, |
| 5858 | const char *const *curopt) |
| 5859 | { |
| 5860 | static const char *const global_options[] = { |
| 5861 | "driver", "filename", NULL |
| 5862 | }; |
| 5863 | |
| 5864 | if (!curopt) { |
| 5865 | return &global_options[0]; |
| 5866 | } |
| 5867 | |
| 5868 | curopt++; |
| 5869 | if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) { |
| 5870 | curopt = bs->drv->strong_runtime_opts; |
| 5871 | } |
| 5872 | |
| 5873 | return (curopt && *curopt) ? curopt : NULL; |
| 5874 | } |
| 5875 | |
| 5876 | /** |
| 5877 | * Copies all strong runtime options from bs->options to the given |
| 5878 | * QDict. The set of strong option keys is determined by invoking |
| 5879 | * strong_options(). |
| 5880 | * |
| 5881 | * Returns true iff any strong option was present in bs->options (and |
| 5882 | * thus copied to the target QDict) with the exception of "filename" |
| 5883 | * and "driver". The caller is expected to use this value to decide |
| 5884 | * whether the existence of strong options prevents the generation of |
| 5885 | * a plain filename. |
| 5886 | */ |
| 5887 | static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs) |
| 5888 | { |
| 5889 | bool found_any = false; |
| 5890 | const char *const *option_name = NULL; |
| 5891 | |
| 5892 | if (!bs->drv) { |
| 5893 | return false; |
| 5894 | } |
| 5895 | |
| 5896 | while ((option_name = strong_options(bs, option_name))) { |
| 5897 | bool option_given = false; |
| 5898 | |
| 5899 | assert(strlen(*option_name) > 0); |
| 5900 | if ((*option_name)[strlen(*option_name) - 1] != '.') { |
| 5901 | QObject *entry = qdict_get(bs->options, *option_name); |
| 5902 | if (!entry) { |
| 5903 | continue; |
| 5904 | } |
| 5905 | |
| 5906 | qdict_put_obj(d, *option_name, qobject_ref(entry)); |
| 5907 | option_given = true; |
| 5908 | } else { |
| 5909 | const QDictEntry *entry; |
| 5910 | for (entry = qdict_first(bs->options); entry; |
| 5911 | entry = qdict_next(bs->options, entry)) |
| 5912 | { |
| 5913 | if (strstart(qdict_entry_key(entry), *option_name, NULL)) { |
| 5914 | qdict_put_obj(d, qdict_entry_key(entry), |
| 5915 | qobject_ref(qdict_entry_value(entry))); |
| 5916 | option_given = true; |
| 5917 | } |
| 5918 | } |
| 5919 | } |
| 5920 | |
| 5921 | /* While "driver" and "filename" need to be included in a JSON filename, |
| 5922 | * their existence does not prohibit generation of a plain filename. */ |
| 5923 | if (!found_any && option_given && |
| 5924 | strcmp(*option_name, "driver") && strcmp(*option_name, "filename")) |
| 5925 | { |
| 5926 | found_any = true; |
| 5927 | } |
| 5928 | } |
| 5929 | |
Max Reitz | 62a01a27 | 2019-02-01 20:29:34 +0100 | [diff] [blame] | 5930 | if (!qdict_haskey(d, "driver")) { |
| 5931 | /* Drivers created with bdrv_new_open_driver() may not have a |
| 5932 | * @driver option. Add it here. */ |
| 5933 | qdict_put_str(d, "driver", bs->drv->format_name); |
| 5934 | } |
| 5935 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 5936 | return found_any; |
| 5937 | } |
| 5938 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 5939 | /* Note: This function may return false positives; it may return true |
| 5940 | * even if opening the backing file specified by bs's image header |
| 5941 | * would result in exactly bs->backing. */ |
| 5942 | static bool bdrv_backing_overridden(BlockDriverState *bs) |
| 5943 | { |
| 5944 | if (bs->backing) { |
| 5945 | return strcmp(bs->auto_backing_file, |
| 5946 | bs->backing->bs->filename); |
| 5947 | } else { |
| 5948 | /* No backing BDS, so if the image header reports any backing |
| 5949 | * file, it must have been suppressed */ |
| 5950 | return bs->auto_backing_file[0] != '\0'; |
| 5951 | } |
| 5952 | } |
| 5953 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5954 | /* Updates the following BDS fields: |
| 5955 | * - exact_filename: A filename which may be used for opening a block device |
| 5956 | * which (mostly) equals the given BDS (even without any |
| 5957 | * other options; so reading and writing must return the same |
| 5958 | * results, but caching etc. may be different) |
| 5959 | * - full_open_options: Options which, when given when opening a block device |
| 5960 | * (without a filename), result in a BDS (mostly) |
| 5961 | * equalling the given one |
| 5962 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 5963 | * full_open_options is converted to a JSON object, prefixed with |
| 5964 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 5965 | */ |
| 5966 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 5967 | { |
| 5968 | BlockDriver *drv = bs->drv; |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 5969 | BdrvChild *child; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5970 | QDict *opts; |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 5971 | bool backing_overridden; |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 5972 | bool generate_json_filename; /* Whether our default implementation should |
| 5973 | fill exact_filename (false) or not (true) */ |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5974 | |
| 5975 | if (!drv) { |
| 5976 | return; |
| 5977 | } |
| 5978 | |
Max Reitz | e24518e | 2019-02-01 20:29:06 +0100 | [diff] [blame] | 5979 | /* This BDS's file name may depend on any of its children's file names, so |
| 5980 | * refresh those first */ |
| 5981 | QLIST_FOREACH(child, &bs->children, next) { |
| 5982 | bdrv_refresh_filename(child->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5983 | } |
| 5984 | |
Max Reitz | bb808d5 | 2019-02-01 20:29:07 +0100 | [diff] [blame] | 5985 | if (bs->implicit) { |
| 5986 | /* For implicit nodes, just copy everything from the single child */ |
| 5987 | child = QLIST_FIRST(&bs->children); |
| 5988 | assert(QLIST_NEXT(child, next) == NULL); |
| 5989 | |
| 5990 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), |
| 5991 | child->bs->exact_filename); |
| 5992 | pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename); |
| 5993 | |
| 5994 | bs->full_open_options = qobject_ref(child->bs->full_open_options); |
| 5995 | |
| 5996 | return; |
| 5997 | } |
| 5998 | |
Max Reitz | 9099362 | 2019-02-01 20:29:09 +0100 | [diff] [blame] | 5999 | backing_overridden = bdrv_backing_overridden(bs); |
| 6000 | |
| 6001 | if (bs->open_flags & BDRV_O_NO_IO) { |
| 6002 | /* Without I/O, the backing file does not change anything. |
| 6003 | * Therefore, in such a case (primarily qemu-img), we can |
| 6004 | * pretend the backing file has not been overridden even if |
| 6005 | * it technically has been. */ |
| 6006 | backing_overridden = false; |
| 6007 | } |
| 6008 | |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 6009 | /* Gather the options QDict */ |
| 6010 | opts = qdict_new(); |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 6011 | generate_json_filename = append_strong_runtime_options(opts, bs); |
| 6012 | generate_json_filename |= backing_overridden; |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 6013 | |
| 6014 | if (drv->bdrv_gather_child_options) { |
| 6015 | /* Some block drivers may not want to present all of their children's |
| 6016 | * options, or name them differently from BdrvChild.name */ |
| 6017 | drv->bdrv_gather_child_options(bs, opts, backing_overridden); |
| 6018 | } else { |
| 6019 | QLIST_FOREACH(child, &bs->children, next) { |
| 6020 | if (child->role == &child_backing && !backing_overridden) { |
| 6021 | /* We can skip the backing BDS if it has not been overridden */ |
| 6022 | continue; |
| 6023 | } |
| 6024 | |
| 6025 | qdict_put(opts, child->name, |
| 6026 | qobject_ref(child->bs->full_open_options)); |
| 6027 | } |
| 6028 | |
| 6029 | if (backing_overridden && !bs->backing) { |
| 6030 | /* Force no backing file */ |
| 6031 | qdict_put_null(opts, "backing"); |
| 6032 | } |
| 6033 | } |
| 6034 | |
| 6035 | qobject_unref(bs->full_open_options); |
| 6036 | bs->full_open_options = opts; |
| 6037 | |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 6038 | if (drv->bdrv_refresh_filename) { |
| 6039 | /* Obsolete information is of no use here, so drop the old file name |
| 6040 | * information before refreshing it */ |
| 6041 | bs->exact_filename[0] = '\0'; |
| 6042 | |
| 6043 | drv->bdrv_refresh_filename(bs); |
| 6044 | } else if (bs->file) { |
| 6045 | /* Try to reconstruct valid information from the underlying file */ |
| 6046 | |
| 6047 | bs->exact_filename[0] = '\0'; |
| 6048 | |
Max Reitz | fb695c7 | 2019-02-01 20:29:29 +0100 | [diff] [blame] | 6049 | /* |
| 6050 | * We can use the underlying file's filename if: |
| 6051 | * - it has a filename, |
| 6052 | * - the file is a protocol BDS, and |
| 6053 | * - opening that file (as this BDS's format) will automatically create |
| 6054 | * the BDS tree we have right now, that is: |
| 6055 | * - the user did not significantly change this BDS's behavior with |
| 6056 | * some explicit (strong) options |
| 6057 | * - no non-file child of this BDS has been overridden by the user |
| 6058 | * Both of these conditions are represented by generate_json_filename. |
| 6059 | */ |
| 6060 | if (bs->file->bs->exact_filename[0] && |
| 6061 | bs->file->bs->drv->bdrv_file_open && |
| 6062 | !generate_json_filename) |
| 6063 | { |
Max Reitz | 998b3a1 | 2019-02-01 20:29:28 +0100 | [diff] [blame] | 6064 | strcpy(bs->exact_filename, bs->file->bs->exact_filename); |
| 6065 | } |
| 6066 | } |
| 6067 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 6068 | if (bs->exact_filename[0]) { |
| 6069 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
Max Reitz | 97e2f02 | 2019-02-01 20:29:27 +0100 | [diff] [blame] | 6070 | } else { |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 6071 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
| 6072 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
| 6073 | qstring_get_str(json)); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 6074 | qobject_unref(json); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 6075 | } |
| 6076 | } |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 6077 | |
Max Reitz | 1e89d0f | 2019-02-01 20:29:18 +0100 | [diff] [blame] | 6078 | char *bdrv_dirname(BlockDriverState *bs, Error **errp) |
| 6079 | { |
| 6080 | BlockDriver *drv = bs->drv; |
| 6081 | |
| 6082 | if (!drv) { |
| 6083 | error_setg(errp, "Node '%s' is ejected", bs->node_name); |
| 6084 | return NULL; |
| 6085 | } |
| 6086 | |
| 6087 | if (drv->bdrv_dirname) { |
| 6088 | return drv->bdrv_dirname(bs, errp); |
| 6089 | } |
| 6090 | |
| 6091 | if (bs->file) { |
| 6092 | return bdrv_dirname(bs->file->bs, errp); |
| 6093 | } |
| 6094 | |
| 6095 | bdrv_refresh_filename(bs); |
| 6096 | if (bs->exact_filename[0] != '\0') { |
| 6097 | return path_combine(bs->exact_filename, ""); |
| 6098 | } |
| 6099 | |
| 6100 | error_setg(errp, "Cannot generate a base directory for %s nodes", |
| 6101 | drv->format_name); |
| 6102 | return NULL; |
| 6103 | } |
| 6104 | |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 6105 | /* |
| 6106 | * Hot add/remove a BDS's child. So the user can take a child offline when |
| 6107 | * it is broken and take a new child online |
| 6108 | */ |
| 6109 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, |
| 6110 | Error **errp) |
| 6111 | { |
| 6112 | |
| 6113 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
| 6114 | error_setg(errp, "The node %s does not support adding a child", |
| 6115 | bdrv_get_device_or_node_name(parent_bs)); |
| 6116 | return; |
| 6117 | } |
| 6118 | |
| 6119 | if (!QLIST_EMPTY(&child_bs->parents)) { |
| 6120 | error_setg(errp, "The node %s already has a parent", |
| 6121 | child_bs->node_name); |
| 6122 | return; |
| 6123 | } |
| 6124 | |
| 6125 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); |
| 6126 | } |
| 6127 | |
| 6128 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) |
| 6129 | { |
| 6130 | BdrvChild *tmp; |
| 6131 | |
| 6132 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
| 6133 | error_setg(errp, "The node %s does not support removing a child", |
| 6134 | bdrv_get_device_or_node_name(parent_bs)); |
| 6135 | return; |
| 6136 | } |
| 6137 | |
| 6138 | QLIST_FOREACH(tmp, &parent_bs->children, next) { |
| 6139 | if (tmp == child) { |
| 6140 | break; |
| 6141 | } |
| 6142 | } |
| 6143 | |
| 6144 | if (!tmp) { |
| 6145 | error_setg(errp, "The node %s does not have a child named %s", |
| 6146 | bdrv_get_device_or_node_name(parent_bs), |
| 6147 | bdrv_get_device_or_node_name(child->bs)); |
| 6148 | return; |
| 6149 | } |
| 6150 | |
| 6151 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); |
| 6152 | } |
Vladimir Sementsov-Ogievskiy | 67b792f | 2017-06-28 15:05:21 +0300 | [diff] [blame] | 6153 | |
| 6154 | bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, |
| 6155 | uint32_t granularity, Error **errp) |
| 6156 | { |
| 6157 | BlockDriver *drv = bs->drv; |
| 6158 | |
| 6159 | if (!drv) { |
| 6160 | error_setg_errno(errp, ENOMEDIUM, |
| 6161 | "Can't store persistent bitmaps to %s", |
| 6162 | bdrv_get_device_or_node_name(bs)); |
| 6163 | return false; |
| 6164 | } |
| 6165 | |
| 6166 | if (!drv->bdrv_can_store_new_dirty_bitmap) { |
| 6167 | error_setg_errno(errp, ENOTSUP, |
| 6168 | "Can't store persistent bitmaps to %s", |
| 6169 | bdrv_get_device_or_node_name(bs)); |
| 6170 | return false; |
| 6171 | } |
| 6172 | |
| 6173 | return drv->bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp); |
| 6174 | } |