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" |
Markus Armbruster | d49b683 | 2015-03-17 18:29:20 +0100 | [diff] [blame] | 30 | #include "qemu/error-report.h" |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 31 | #include "module_block.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 32 | #include "qemu/module.h" |
Markus Armbruster | e688df6 | 2018-02-01 12:18:31 +0100 | [diff] [blame] | 33 | #include "qapi/error.h" |
Markus Armbruster | 452fcdb | 2018-02-01 12:18:39 +0100 | [diff] [blame] | 34 | #include "qapi/qmp/qdict.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 35 | #include "qapi/qmp/qjson.h" |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 36 | #include "qapi/qmp/qnull.h" |
Markus Armbruster | fc81fa1 | 2018-02-01 12:18:40 +0100 | [diff] [blame] | 37 | #include "qapi/qmp/qstring.h" |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 38 | #include "qapi/qobject-output-visitor.h" |
| 39 | #include "qapi/qapi-visit-block-core.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 40 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 41 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 42 | #include "qemu/notify.h" |
Markus Armbruster | 922a01a | 2018-02-01 12:18:46 +0100 | [diff] [blame] | 43 | #include "qemu/option.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 44 | #include "qemu/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 45 | #include "block/qapi.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 46 | #include "qemu/timer.h" |
Veronia Bahaa | f348b6d | 2016-03-20 19:16:19 +0200 | [diff] [blame] | 47 | #include "qemu/cutils.h" |
| 48 | #include "qemu/id.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 49 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 50 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 51 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 52 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 53 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 54 | #include <sys/disk.h> |
| 55 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 56 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 57 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 58 | #ifdef _WIN32 |
| 59 | #include <windows.h> |
| 60 | #endif |
| 61 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 62 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 63 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 64 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 65 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 66 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 67 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
| 68 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); |
| 69 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 70 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 71 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 72 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 73 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
| 74 | const char *reference, |
| 75 | QDict *options, int flags, |
| 76 | BlockDriverState *parent, |
| 77 | const BdrvChildRole *child_role, |
| 78 | Error **errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 79 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 80 | /* If non-zero, use only whitelisted block drivers */ |
| 81 | static int use_bdrv_whitelist; |
| 82 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 83 | #ifdef _WIN32 |
| 84 | static int is_windows_drive_prefix(const char *filename) |
| 85 | { |
| 86 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 87 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 88 | filename[1] == ':'); |
| 89 | } |
| 90 | |
| 91 | int is_windows_drive(const char *filename) |
| 92 | { |
| 93 | if (is_windows_drive_prefix(filename) && |
| 94 | filename[2] == '\0') |
| 95 | return 1; |
| 96 | if (strstart(filename, "\\\\.\\", NULL) || |
| 97 | strstart(filename, "//./", NULL)) |
| 98 | return 1; |
| 99 | return 0; |
| 100 | } |
| 101 | #endif |
| 102 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 103 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 104 | { |
| 105 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 106 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 107 | return MAX(4096, getpagesize()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | return bs->bl.opt_mem_alignment; |
| 111 | } |
| 112 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 113 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 114 | { |
| 115 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 116 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 117 | return MAX(4096, getpagesize()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 118 | } |
| 119 | |
| 120 | return bs->bl.min_mem_alignment; |
| 121 | } |
| 122 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 123 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 124 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 125 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 126 | const char *p; |
| 127 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 128 | #ifdef _WIN32 |
| 129 | if (is_windows_drive(path) || |
| 130 | is_windows_drive_prefix(path)) { |
| 131 | return 0; |
| 132 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 133 | p = path + strcspn(path, ":/\\"); |
| 134 | #else |
| 135 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 136 | #endif |
| 137 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 138 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 139 | } |
| 140 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 141 | int path_is_absolute(const char *path) |
| 142 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 143 | #ifdef _WIN32 |
| 144 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 145 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 146 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 147 | } |
| 148 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 149 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 150 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 151 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 155 | path to it by considering it is relative to base_path. URL are |
| 156 | supported. */ |
| 157 | void path_combine(char *dest, int dest_size, |
| 158 | const char *base_path, |
| 159 | const char *filename) |
| 160 | { |
| 161 | const char *p, *p1; |
| 162 | int len; |
| 163 | |
| 164 | if (dest_size <= 0) |
| 165 | return; |
| 166 | if (path_is_absolute(filename)) { |
| 167 | pstrcpy(dest, dest_size, filename); |
| 168 | } else { |
Max Reitz | 0d54a6f | 2017-05-22 21:52:15 +0200 | [diff] [blame] | 169 | const char *protocol_stripped = NULL; |
| 170 | |
| 171 | if (path_has_protocol(base_path)) { |
| 172 | protocol_stripped = strchr(base_path, ':'); |
| 173 | if (protocol_stripped) { |
| 174 | protocol_stripped++; |
| 175 | } |
| 176 | } |
| 177 | p = protocol_stripped ?: base_path; |
| 178 | |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 179 | p1 = strrchr(base_path, '/'); |
| 180 | #ifdef _WIN32 |
| 181 | { |
| 182 | const char *p2; |
| 183 | p2 = strrchr(base_path, '\\'); |
| 184 | if (!p1 || p2 > p1) |
| 185 | p1 = p2; |
| 186 | } |
| 187 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 188 | if (p1) |
| 189 | p1++; |
| 190 | else |
| 191 | p1 = base_path; |
| 192 | if (p1 > p) |
| 193 | p = p1; |
| 194 | len = p - base_path; |
| 195 | if (len > dest_size - 1) |
| 196 | len = dest_size - 1; |
| 197 | memcpy(dest, base_path, len); |
| 198 | dest[len] = '\0'; |
| 199 | pstrcat(dest, dest_size, filename); |
| 200 | } |
| 201 | } |
| 202 | |
Max Reitz | 03c320d | 2017-05-22 21:52:16 +0200 | [diff] [blame] | 203 | /* |
| 204 | * Helper function for bdrv_parse_filename() implementations to remove optional |
| 205 | * protocol prefixes (especially "file:") from a filename and for putting the |
| 206 | * stripped filename into the options QDict if there is such a prefix. |
| 207 | */ |
| 208 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, |
| 209 | QDict *options) |
| 210 | { |
| 211 | if (strstart(filename, prefix, &filename)) { |
| 212 | /* Stripping the explicit protocol prefix may result in a protocol |
| 213 | * prefix being (wrongly) detected (if the filename contains a colon) */ |
| 214 | if (path_has_protocol(filename)) { |
| 215 | QString *fat_filename; |
| 216 | |
| 217 | /* This means there is some colon before the first slash; therefore, |
| 218 | * this cannot be an absolute path */ |
| 219 | assert(!path_is_absolute(filename)); |
| 220 | |
| 221 | /* And we can thus fix the protocol detection issue by prefixing it |
| 222 | * by "./" */ |
| 223 | fat_filename = qstring_from_str("./"); |
| 224 | qstring_append(fat_filename, filename); |
| 225 | |
| 226 | assert(!path_has_protocol(qstring_get_str(fat_filename))); |
| 227 | |
| 228 | qdict_put(options, "filename", fat_filename); |
| 229 | } else { |
| 230 | /* If no protocol prefix was detected, we can use the shortened |
| 231 | * filename as-is */ |
| 232 | qdict_put_str(options, "filename", filename); |
| 233 | } |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 238 | /* Returns whether the image file is opened as read-only. Note that this can |
| 239 | * return false and writing to the image file is still not possible because the |
| 240 | * image is inactivated. */ |
Jeff Cody | 93ed524 | 2017-04-07 16:55:28 -0400 | [diff] [blame] | 241 | bool bdrv_is_read_only(BlockDriverState *bs) |
| 242 | { |
| 243 | return bs->read_only; |
| 244 | } |
| 245 | |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 246 | int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
| 247 | bool ignore_allow_rdw, Error **errp) |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 248 | { |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 249 | /* Do not set read_only if copy_on_read is enabled */ |
| 250 | if (bs->copy_on_read && read_only) { |
| 251 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", |
| 252 | bdrv_get_device_or_node_name(bs)); |
| 253 | return -EINVAL; |
| 254 | } |
| 255 | |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 256 | /* Do not clear read_only if it is prohibited */ |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 257 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 258 | !ignore_allow_rdw) |
| 259 | { |
Jeff Cody | d6fcdf0 | 2017-04-07 16:55:27 -0400 | [diff] [blame] | 260 | error_setg(errp, "Node '%s' is read only", |
| 261 | bdrv_get_device_or_node_name(bs)); |
| 262 | return -EPERM; |
| 263 | } |
| 264 | |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 265 | return 0; |
| 266 | } |
| 267 | |
Kevin Wolf | 398e6ad | 2017-11-07 18:21:41 +0100 | [diff] [blame] | 268 | /* TODO Remove (deprecated since 2.11) |
| 269 | * Block drivers are not supposed to automatically change bs->read_only. |
| 270 | * Instead, they should just check whether they can provide what the user |
| 271 | * explicitly requested and error out if read-write is requested, but they can |
| 272 | * only provide read-only access. */ |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 273 | int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) |
| 274 | { |
| 275 | int ret = 0; |
| 276 | |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 277 | ret = bdrv_can_set_read_only(bs, read_only, false, errp); |
Jeff Cody | 45803a0 | 2017-04-07 16:55:29 -0400 | [diff] [blame] | 278 | if (ret < 0) { |
| 279 | return ret; |
| 280 | } |
| 281 | |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 282 | bs->read_only = read_only; |
Jeff Cody | e2b8247 | 2017-04-07 16:55:26 -0400 | [diff] [blame] | 283 | return 0; |
Jeff Cody | fe5241b | 2017-04-07 16:55:25 -0400 | [diff] [blame] | 284 | } |
| 285 | |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 286 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 287 | const char *backing, |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 288 | char *dest, size_t sz, |
| 289 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 290 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 291 | if (backing[0] == '\0' || path_has_protocol(backing) || |
| 292 | path_is_absolute(backing)) |
| 293 | { |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 294 | pstrcpy(dest, sz, backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 295 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 296 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 297 | backed); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 298 | } else { |
| 299 | path_combine(dest, sz, backed, backing); |
| 300 | } |
| 301 | } |
| 302 | |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 303 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
| 304 | Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 305 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 306 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
| 307 | |
| 308 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, |
| 309 | dest, sz, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 310 | } |
| 311 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 312 | void bdrv_register(BlockDriver *bdrv) |
| 313 | { |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 314 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 315 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 316 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 317 | BlockDriverState *bdrv_new(void) |
| 318 | { |
| 319 | BlockDriverState *bs; |
| 320 | int i; |
| 321 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 322 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 323 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 324 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 325 | QLIST_INIT(&bs->op_blockers[i]); |
| 326 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 327 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Paolo Bonzini | 3783fa3 | 2017-06-05 14:39:02 +0200 | [diff] [blame] | 328 | qemu_co_mutex_init(&bs->reqs_lock); |
Paolo Bonzini | 2119882 | 2017-06-05 14:39:03 +0200 | [diff] [blame] | 329 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 330 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 331 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 332 | |
Evgeny Yakovlev | 3ff2f67 | 2016-07-18 22:39:52 +0300 | [diff] [blame] | 333 | qemu_co_queue_init(&bs->flush_queue); |
| 334 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 335 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 336 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 337 | return bs; |
| 338 | } |
| 339 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 340 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 341 | { |
| 342 | BlockDriver *drv1; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 343 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 344 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 345 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 346 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 347 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 348 | } |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 349 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 350 | return NULL; |
| 351 | } |
| 352 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 353 | BlockDriver *bdrv_find_format(const char *format_name) |
| 354 | { |
| 355 | BlockDriver *drv1; |
| 356 | int i; |
| 357 | |
| 358 | drv1 = bdrv_do_find_format(format_name); |
| 359 | if (drv1) { |
| 360 | return drv1; |
| 361 | } |
| 362 | |
| 363 | /* The driver isn't registered, maybe we need to load a module */ |
| 364 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 365 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { |
| 366 | block_module_load_one(block_driver_modules[i].library_name); |
| 367 | break; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | return bdrv_do_find_format(format_name); |
| 372 | } |
| 373 | |
Kevin Wolf | e8eb863 | 2018-02-21 11:47:43 +0100 | [diff] [blame] | 374 | int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 375 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 376 | static const char *whitelist_rw[] = { |
| 377 | CONFIG_BDRV_RW_WHITELIST |
| 378 | }; |
| 379 | static const char *whitelist_ro[] = { |
| 380 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 381 | }; |
| 382 | const char **p; |
| 383 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 384 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 385 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 386 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 387 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 388 | for (p = whitelist_rw; *p; p++) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 389 | if (!strcmp(drv->format_name, *p)) { |
| 390 | return 1; |
| 391 | } |
| 392 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 393 | if (read_only) { |
| 394 | for (p = whitelist_ro; *p; p++) { |
| 395 | if (!strcmp(drv->format_name, *p)) { |
| 396 | return 1; |
| 397 | } |
| 398 | } |
| 399 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 400 | return 0; |
| 401 | } |
| 402 | |
Daniel P. Berrange | e6ff69b | 2016-03-21 14:11:48 +0000 | [diff] [blame] | 403 | bool bdrv_uses_whitelist(void) |
| 404 | { |
| 405 | return use_bdrv_whitelist; |
| 406 | } |
| 407 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 408 | typedef struct CreateCo { |
| 409 | BlockDriver *drv; |
| 410 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 411 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 412 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 413 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 414 | } CreateCo; |
| 415 | |
| 416 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 417 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 418 | Error *local_err = NULL; |
| 419 | int ret; |
| 420 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 421 | CreateCo *cco = opaque; |
| 422 | assert(cco->drv); |
| 423 | |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 424 | 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] | 425 | error_propagate(&cco->err, local_err); |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 426 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 427 | } |
| 428 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 429 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 430 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 431 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 432 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 433 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 434 | Coroutine *co; |
| 435 | CreateCo cco = { |
| 436 | .drv = drv, |
| 437 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 438 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 439 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 440 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 441 | }; |
| 442 | |
Stefan Hajnoczi | efc75e2 | 2018-01-18 13:43:45 +0100 | [diff] [blame] | 443 | if (!drv->bdrv_co_create_opts) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 444 | 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] | 445 | ret = -ENOTSUP; |
| 446 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | if (qemu_in_coroutine()) { |
| 450 | /* Fast-path if already in coroutine context */ |
| 451 | bdrv_create_co_entry(&cco); |
| 452 | } else { |
Paolo Bonzini | 0b8b875 | 2016-07-04 19:10:01 +0200 | [diff] [blame] | 453 | co = qemu_coroutine_create(bdrv_create_co_entry, &cco); |
| 454 | qemu_coroutine_enter(co); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 455 | while (cco.ret == NOT_DONE) { |
Paolo Bonzini | b47ec2c | 2014-07-07 15:18:01 +0200 | [diff] [blame] | 456 | aio_poll(qemu_get_aio_context(), true); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 457 | } |
| 458 | } |
| 459 | |
| 460 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 461 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 462 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 463 | error_propagate(errp, cco.err); |
| 464 | } else { |
| 465 | error_setg_errno(errp, -ret, "Could not create image"); |
| 466 | } |
| 467 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 468 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 469 | out: |
| 470 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 471 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 472 | } |
| 473 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 474 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 475 | { |
| 476 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 477 | Error *local_err = NULL; |
| 478 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 479 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 480 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 481 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 482 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 483 | } |
| 484 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 485 | ret = bdrv_create(drv, filename, opts, &local_err); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 486 | error_propagate(errp, local_err); |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 487 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 488 | } |
| 489 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 490 | /** |
| 491 | * Try to get @bs's logical and physical block size. |
| 492 | * On success, store them in @bsz struct and return 0. |
| 493 | * On failure return -errno. |
| 494 | * @bs must not be empty. |
| 495 | */ |
| 496 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 497 | { |
| 498 | BlockDriver *drv = bs->drv; |
| 499 | |
| 500 | if (drv && drv->bdrv_probe_blocksizes) { |
| 501 | return drv->bdrv_probe_blocksizes(bs, bsz); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 502 | } else if (drv && drv->is_filter && bs->file) { |
| 503 | return bdrv_probe_blocksizes(bs->file->bs, bsz); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 504 | } |
| 505 | |
| 506 | return -ENOTSUP; |
| 507 | } |
| 508 | |
| 509 | /** |
| 510 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 511 | * On success, store them in @geo struct and return 0. |
| 512 | * On failure return -errno. |
| 513 | * @bs must not be empty. |
| 514 | */ |
| 515 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 516 | { |
| 517 | BlockDriver *drv = bs->drv; |
| 518 | |
| 519 | if (drv && drv->bdrv_probe_geometry) { |
| 520 | return drv->bdrv_probe_geometry(bs, geo); |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 521 | } else if (drv && drv->is_filter && bs->file) { |
| 522 | return bdrv_probe_geometry(bs->file->bs, geo); |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | return -ENOTSUP; |
| 526 | } |
| 527 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 528 | /* |
| 529 | * Create a uniquely-named empty temporary file. |
| 530 | * Return 0 upon success, otherwise a negative errno value. |
| 531 | */ |
| 532 | int get_tmp_filename(char *filename, int size) |
| 533 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 534 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 535 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 536 | /* GetTempFileName requires that its output buffer (4th param) |
| 537 | have length MAX_PATH or greater. */ |
| 538 | assert(size >= MAX_PATH); |
| 539 | return (GetTempPath(MAX_PATH, temp_dir) |
| 540 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 541 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 542 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 543 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 544 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 545 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 546 | if (!tmpdir) { |
| 547 | tmpdir = "/var/tmp"; |
| 548 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 549 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 550 | return -EOVERFLOW; |
| 551 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 552 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 553 | if (fd < 0) { |
| 554 | return -errno; |
| 555 | } |
| 556 | if (close(fd) != 0) { |
| 557 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 558 | return -errno; |
| 559 | } |
| 560 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 561 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 562 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 563 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 564 | /* |
| 565 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 566 | * recognized as a host CDROM. |
| 567 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 568 | static BlockDriver *find_hdev_driver(const char *filename) |
| 569 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 570 | int score_max = 0, score; |
| 571 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 572 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 573 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 574 | if (d->bdrv_probe_device) { |
| 575 | score = d->bdrv_probe_device(filename); |
| 576 | if (score > score_max) { |
| 577 | score_max = score; |
| 578 | drv = d; |
| 579 | } |
| 580 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 581 | } |
| 582 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 583 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 584 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 585 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 586 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
| 587 | { |
| 588 | BlockDriver *drv1; |
| 589 | |
| 590 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 591 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { |
| 592 | return drv1; |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | return NULL; |
| 597 | } |
| 598 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 599 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 600 | bool allow_protocol_prefix, |
| 601 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 602 | { |
| 603 | BlockDriver *drv1; |
| 604 | char protocol[128]; |
| 605 | int len; |
| 606 | const char *p; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 607 | int i; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 608 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 609 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 610 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 611 | /* |
| 612 | * XXX(hch): we really should not let host device detection |
| 613 | * override an explicit protocol specification, but moving this |
| 614 | * later breaks access to device names with colons in them. |
| 615 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 616 | * based Linux systems those actually are quite common. |
| 617 | */ |
| 618 | drv1 = find_hdev_driver(filename); |
| 619 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 620 | return drv1; |
| 621 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 622 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 623 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 624 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 625 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 626 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 627 | p = strchr(filename, ':'); |
| 628 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 629 | len = p - filename; |
| 630 | if (len > sizeof(protocol) - 1) |
| 631 | len = sizeof(protocol) - 1; |
| 632 | memcpy(protocol, filename, len); |
| 633 | protocol[len] = '\0'; |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 634 | |
| 635 | drv1 = bdrv_do_find_protocol(protocol); |
| 636 | if (drv1) { |
| 637 | return drv1; |
| 638 | } |
| 639 | |
| 640 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { |
| 641 | if (block_driver_modules[i].protocol_name && |
| 642 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { |
| 643 | block_module_load_one(block_driver_modules[i].library_name); |
| 644 | break; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 645 | } |
| 646 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 647 | |
Marc Mari | 88d8879 | 2016-08-12 09:27:03 -0400 | [diff] [blame] | 648 | drv1 = bdrv_do_find_protocol(protocol); |
| 649 | if (!drv1) { |
| 650 | error_setg(errp, "Unknown protocol '%s'", protocol); |
| 651 | } |
| 652 | return drv1; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 653 | } |
| 654 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 655 | /* |
| 656 | * Guess image format by probing its contents. |
| 657 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 658 | * we do it anyway for backward compatibility. |
| 659 | * |
| 660 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 661 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 662 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 663 | * @filename is its filename. |
| 664 | * |
| 665 | * For all block drivers, call the bdrv_probe() method to get its |
| 666 | * probing score. |
| 667 | * Return the first block driver with the highest probing score. |
| 668 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 669 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 670 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 671 | { |
| 672 | int score_max = 0, score; |
| 673 | BlockDriver *drv = NULL, *d; |
| 674 | |
| 675 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 676 | if (d->bdrv_probe) { |
| 677 | score = d->bdrv_probe(buf, buf_size, filename); |
| 678 | if (score > score_max) { |
| 679 | score_max = score; |
| 680 | drv = d; |
| 681 | } |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | return drv; |
| 686 | } |
| 687 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 688 | static int find_image_format(BlockBackend *file, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 689 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 690 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 691 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 692 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 693 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 694 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 695 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 696 | 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] | 697 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 698 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 699 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 700 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 701 | ret = blk_pread(file, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 702 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 703 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 704 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 705 | *pdrv = NULL; |
| 706 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 707 | } |
| 708 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 709 | drv = bdrv_probe_all(buf, ret, filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 710 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 711 | error_setg(errp, "Could not determine image format: No compatible " |
| 712 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 713 | ret = -ENOENT; |
| 714 | } |
| 715 | *pdrv = drv; |
| 716 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 717 | } |
| 718 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 719 | /** |
| 720 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 721 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 722 | */ |
| 723 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 724 | { |
| 725 | BlockDriver *drv = bs->drv; |
| 726 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 727 | if (!drv) { |
| 728 | return -ENOMEDIUM; |
| 729 | } |
| 730 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 731 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 732 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 733 | return 0; |
| 734 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 735 | /* query actual device if possible, otherwise just trust the hint */ |
| 736 | if (drv->bdrv_getlength) { |
| 737 | int64_t length = drv->bdrv_getlength(bs); |
| 738 | if (length < 0) { |
| 739 | return length; |
| 740 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 741 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | bs->total_sectors = hint; |
| 745 | return 0; |
| 746 | } |
| 747 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 748 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 749 | * Combines a QDict of new block driver @options with any missing options taken |
| 750 | * from @old_options, so that leaving out an option defaults to its old value. |
| 751 | */ |
| 752 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 753 | QDict *old_options) |
| 754 | { |
| 755 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 756 | bs->drv->bdrv_join_options(options, old_options); |
| 757 | } else { |
| 758 | qdict_join(options, old_options, false); |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 763 | * Set open flags for a given discard mode |
| 764 | * |
| 765 | * Return 0 on success, -1 if the discard mode was invalid. |
| 766 | */ |
| 767 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 768 | { |
| 769 | *flags &= ~BDRV_O_UNMAP; |
| 770 | |
| 771 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 772 | /* do nothing */ |
| 773 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 774 | *flags |= BDRV_O_UNMAP; |
| 775 | } else { |
| 776 | return -1; |
| 777 | } |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
| 782 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 783 | * Set open flags for a given cache mode |
| 784 | * |
| 785 | * Return 0 on success, -1 if the cache mode was invalid. |
| 786 | */ |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 787 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 788 | { |
| 789 | *flags &= ~BDRV_O_CACHE_MASK; |
| 790 | |
| 791 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 792 | *writethrough = false; |
| 793 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 794 | } else if (!strcmp(mode, "directsync")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 795 | *writethrough = true; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 796 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 797 | } else if (!strcmp(mode, "writeback")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 798 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 799 | } else if (!strcmp(mode, "unsafe")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 800 | *writethrough = false; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 801 | *flags |= BDRV_O_NO_FLUSH; |
| 802 | } else if (!strcmp(mode, "writethrough")) { |
Kevin Wolf | 53e8ae0 | 2016-03-18 15:36:58 +0100 | [diff] [blame] | 803 | *writethrough = true; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 804 | } else { |
| 805 | return -1; |
| 806 | } |
| 807 | |
| 808 | return 0; |
| 809 | } |
| 810 | |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 811 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
| 812 | { |
| 813 | BlockDriverState *parent = c->opaque; |
| 814 | return g_strdup(bdrv_get_device_or_node_name(parent)); |
| 815 | } |
| 816 | |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 817 | static void bdrv_child_cb_drained_begin(BdrvChild *child) |
| 818 | { |
| 819 | BlockDriverState *bs = child->opaque; |
| 820 | bdrv_drained_begin(bs); |
| 821 | } |
| 822 | |
| 823 | static void bdrv_child_cb_drained_end(BdrvChild *child) |
| 824 | { |
| 825 | BlockDriverState *bs = child->opaque; |
| 826 | bdrv_drained_end(bs); |
| 827 | } |
| 828 | |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 829 | static void bdrv_child_cb_attach(BdrvChild *child) |
| 830 | { |
| 831 | BlockDriverState *bs = child->opaque; |
| 832 | bdrv_apply_subtree_drain(child, bs); |
| 833 | } |
| 834 | |
| 835 | static void bdrv_child_cb_detach(BdrvChild *child) |
| 836 | { |
| 837 | BlockDriverState *bs = child->opaque; |
| 838 | bdrv_unapply_subtree_drain(child, bs); |
| 839 | } |
| 840 | |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 841 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
| 842 | { |
| 843 | BlockDriverState *bs = child->opaque; |
| 844 | assert(bs->open_flags & BDRV_O_INACTIVE); |
| 845 | return 0; |
| 846 | } |
| 847 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 848 | /* |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 849 | * Returns the options and flags that a temporary snapshot should get, based on |
| 850 | * the originally requested flags (the originally requested image will have |
| 851 | * flags like a backing file) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 852 | */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 853 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
| 854 | int parent_flags, QDict *parent_options) |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 855 | { |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 856 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 857 | |
| 858 | /* For temporary files, unconditional cache=unsafe is fine */ |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 859 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
| 860 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 861 | |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 862 | /* Copy the read-only option from the parent */ |
| 863 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 864 | |
Kevin Wolf | 4186904 | 2016-06-16 12:59:30 +0200 | [diff] [blame] | 865 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
| 866 | * temporary snapshot */ |
| 867 | *child_flags &= ~BDRV_O_NATIVE_AIO; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 871 | * Returns the options and flags that bs->file should get if a protocol driver |
| 872 | * 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] | 873 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 874 | static void bdrv_inherited_options(int *child_flags, QDict *child_options, |
| 875 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 876 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 877 | int flags = parent_flags; |
| 878 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 879 | /* Enable protocol handling, disable format probing for bs->file */ |
| 880 | flags |= BDRV_O_PROTOCOL; |
| 881 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 882 | /* If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 883 | * the parent. */ |
| 884 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 885 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 886 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 887 | |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 888 | /* Inherit the read-only option from the parent if it's not set */ |
| 889 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); |
| 890 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 891 | /* Our block drivers take care to send flushes and respect unmap policy, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 892 | * so we can default to enable both on lower layers regardless of the |
| 893 | * corresponding parent options. */ |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 894 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 895 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 896 | /* Clear flags that only apply to the top layer */ |
Daniel P. Berrange | abb06c5 | 2016-03-21 14:11:42 +0000 | [diff] [blame] | 897 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ | |
| 898 | BDRV_O_NO_IO); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 899 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 900 | *child_flags = flags; |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 901 | } |
| 902 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 903 | const BdrvChildRole child_file = { |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 904 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 905 | .inherit_options = bdrv_inherited_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 906 | .drained_begin = bdrv_child_cb_drained_begin, |
| 907 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 908 | .attach = bdrv_child_cb_attach, |
| 909 | .detach = bdrv_child_cb_detach, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 910 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 911 | }; |
| 912 | |
| 913 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 914 | * Returns the options and flags that bs->file should get if the use of formats |
| 915 | * (and not only protocols) is permitted for it, based on the given options and |
| 916 | * flags for the parent BDS |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 917 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 918 | static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options, |
| 919 | int parent_flags, QDict *parent_options) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 920 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 921 | child_file.inherit_options(child_flags, child_options, |
| 922 | parent_flags, parent_options); |
| 923 | |
Daniel P. Berrange | abb06c5 | 2016-03-21 14:11:42 +0000 | [diff] [blame] | 924 | *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 925 | } |
| 926 | |
| 927 | const BdrvChildRole child_format = { |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 928 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 929 | .inherit_options = bdrv_inherited_fmt_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 930 | .drained_begin = bdrv_child_cb_drained_begin, |
| 931 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 932 | .attach = bdrv_child_cb_attach, |
| 933 | .detach = bdrv_child_cb_detach, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 934 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 935 | }; |
| 936 | |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 937 | static void bdrv_backing_attach(BdrvChild *c) |
| 938 | { |
| 939 | BlockDriverState *parent = c->opaque; |
| 940 | BlockDriverState *backing_hd = c->bs; |
| 941 | |
| 942 | assert(!parent->backing_blocker); |
| 943 | error_setg(&parent->backing_blocker, |
| 944 | "node is used as backing hd of '%s'", |
| 945 | bdrv_get_device_or_node_name(parent)); |
| 946 | |
| 947 | parent->open_flags &= ~BDRV_O_NO_BACKING; |
| 948 | pstrcpy(parent->backing_file, sizeof(parent->backing_file), |
| 949 | backing_hd->filename); |
| 950 | pstrcpy(parent->backing_format, sizeof(parent->backing_format), |
| 951 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
| 952 | |
| 953 | bdrv_op_block_all(backing_hd, parent->backing_blocker); |
| 954 | /* Otherwise we won't be able to commit or stream */ |
| 955 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
| 956 | parent->backing_blocker); |
| 957 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, |
| 958 | parent->backing_blocker); |
| 959 | /* |
| 960 | * We do backup in 3 ways: |
| 961 | * 1. drive backup |
| 962 | * The target bs is new opened, and the source is top BDS |
| 963 | * 2. blockdev backup |
| 964 | * Both the source and the target are top BDSes. |
| 965 | * 3. internal backup(used for block replication) |
| 966 | * Both the source and the target are backing file |
| 967 | * |
| 968 | * In case 1 and 2, neither the source nor the target is the backing file. |
| 969 | * In case 3, we will block the top BDS, so there is only one block job |
| 970 | * for the top BDS and its backing chain. |
| 971 | */ |
| 972 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, |
| 973 | parent->backing_blocker); |
| 974 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, |
| 975 | parent->backing_blocker); |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 976 | |
| 977 | bdrv_child_cb_attach(c); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | static void bdrv_backing_detach(BdrvChild *c) |
| 981 | { |
| 982 | BlockDriverState *parent = c->opaque; |
| 983 | |
| 984 | assert(parent->backing_blocker); |
| 985 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); |
| 986 | error_free(parent->backing_blocker); |
| 987 | parent->backing_blocker = NULL; |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 988 | |
| 989 | bdrv_child_cb_detach(c); |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 990 | } |
| 991 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 992 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 993 | * Returns the options and flags that bs->backing should get, based on the |
| 994 | * given options and flags for the parent BDS |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 995 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 996 | static void bdrv_backing_options(int *child_flags, QDict *child_options, |
| 997 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 998 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 999 | int flags = parent_flags; |
| 1000 | |
Kevin Wolf | b8816a4 | 2016-03-04 14:52:32 +0100 | [diff] [blame] | 1001 | /* The cache mode is inherited unmodified for backing files; except WCE, |
| 1002 | * which is only applied on the top level (BlockBackend) */ |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1003 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 1004 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1005 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1006 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1007 | /* backing files always opened read-only */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1008 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
| 1009 | flags &= ~BDRV_O_COPY_ON_READ; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1010 | |
| 1011 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1012 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1013 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1014 | *child_flags = flags; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1015 | } |
| 1016 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1017 | static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base, |
| 1018 | const char *filename, Error **errp) |
| 1019 | { |
| 1020 | BlockDriverState *parent = c->opaque; |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1021 | int orig_flags = bdrv_get_flags(parent); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1022 | int ret; |
| 1023 | |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1024 | if (!(orig_flags & BDRV_O_RDWR)) { |
| 1025 | ret = bdrv_reopen(parent, orig_flags | BDRV_O_RDWR, errp); |
| 1026 | if (ret < 0) { |
| 1027 | return ret; |
| 1028 | } |
| 1029 | } |
| 1030 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1031 | ret = bdrv_change_backing_file(parent, filename, |
| 1032 | base->drv ? base->drv->format_name : ""); |
| 1033 | if (ret < 0) { |
Kevin Wolf | 6473069 | 2017-11-06 17:52:58 +0100 | [diff] [blame] | 1034 | error_setg_errno(errp, -ret, "Could not update backing file link"); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1035 | } |
| 1036 | |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 1037 | if (!(orig_flags & BDRV_O_RDWR)) { |
| 1038 | bdrv_reopen(parent, orig_flags, NULL); |
| 1039 | } |
| 1040 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1041 | return ret; |
| 1042 | } |
| 1043 | |
Kevin Wolf | 91ef382 | 2016-12-20 16:23:46 +0100 | [diff] [blame] | 1044 | const BdrvChildRole child_backing = { |
Kevin Wolf | b541155 | 2017-01-17 15:56:16 +0100 | [diff] [blame] | 1045 | .get_parent_desc = bdrv_child_get_parent_desc, |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 1046 | .attach = bdrv_backing_attach, |
| 1047 | .detach = bdrv_backing_detach, |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1048 | .inherit_options = bdrv_backing_options, |
Kevin Wolf | 20018e1 | 2016-05-23 18:46:59 +0200 | [diff] [blame] | 1049 | .drained_begin = bdrv_child_cb_drained_begin, |
| 1050 | .drained_end = bdrv_child_cb_drained_end, |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 1051 | .inactivate = bdrv_child_cb_inactivate, |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 1052 | .update_filename = bdrv_backing_update_filename, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1053 | }; |
| 1054 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1055 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 1056 | { |
Kevin Wolf | 61de4c6 | 2016-03-18 17:46:45 +0100 | [diff] [blame] | 1057 | int open_flags = flags; |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1058 | |
| 1059 | /* |
| 1060 | * Clear flags that are internal to the block layer before opening the |
| 1061 | * image. |
| 1062 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 1063 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1064 | |
| 1065 | /* |
| 1066 | * Snapshots should be writable. |
| 1067 | */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1068 | if (flags & BDRV_O_TEMPORARY) { |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 1069 | open_flags |= BDRV_O_RDWR; |
| 1070 | } |
| 1071 | |
| 1072 | return open_flags; |
| 1073 | } |
| 1074 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1075 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 1076 | { |
| 1077 | *flags &= ~BDRV_O_CACHE_MASK; |
| 1078 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1079 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_NO_FLUSH)); |
| 1080 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { |
| 1081 | *flags |= BDRV_O_NO_FLUSH; |
| 1082 | } |
| 1083 | |
| 1084 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_DIRECT)); |
| 1085 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
| 1086 | *flags |= BDRV_O_NOCACHE; |
| 1087 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1088 | |
| 1089 | *flags &= ~BDRV_O_RDWR; |
| 1090 | |
| 1091 | assert(qemu_opt_find(opts, BDRV_OPT_READ_ONLY)); |
| 1092 | if (!qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false)) { |
| 1093 | *flags |= BDRV_O_RDWR; |
| 1094 | } |
| 1095 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1096 | } |
| 1097 | |
| 1098 | static void update_options_from_flags(QDict *options, int flags) |
| 1099 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1100 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1101 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1102 | } |
| 1103 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1104 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 1105 | flags & BDRV_O_NO_FLUSH); |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1106 | } |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1107 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1108 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1109 | } |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1110 | } |
| 1111 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1112 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 1113 | const char *node_name, |
| 1114 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1115 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1116 | char *gen_node_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1117 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1118 | if (!node_name) { |
| 1119 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 1120 | } else if (!id_wellformed(node_name)) { |
| 1121 | /* |
| 1122 | * Check for empty string or invalid characters, but not if it is |
| 1123 | * generated (generated names use characters not available to the user) |
| 1124 | */ |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 1125 | error_setg(errp, "Invalid node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 1126 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1127 | } |
| 1128 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1129 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 1130 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1131 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 1132 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1133 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 1134 | } |
| 1135 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1136 | /* takes care of avoiding duplicates node names */ |
| 1137 | if (bdrv_find_node(node_name)) { |
| 1138 | error_setg(errp, "Duplicate node name"); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1139 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | /* copy node name into the bs and insert it into the graph list */ |
| 1143 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 1144 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 1145 | out: |
| 1146 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1147 | } |
| 1148 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1149 | static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, |
| 1150 | const char *node_name, QDict *options, |
| 1151 | int open_flags, Error **errp) |
| 1152 | { |
| 1153 | Error *local_err = NULL; |
| 1154 | int ret; |
| 1155 | |
| 1156 | bdrv_assign_node_name(bs, node_name, &local_err); |
| 1157 | if (local_err) { |
| 1158 | error_propagate(errp, local_err); |
| 1159 | return -EINVAL; |
| 1160 | } |
| 1161 | |
| 1162 | bs->drv = drv; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1163 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1164 | bs->opaque = g_malloc0(drv->instance_size); |
| 1165 | |
| 1166 | if (drv->bdrv_file_open) { |
| 1167 | assert(!drv->bdrv_needs_filename || bs->filename[0]); |
| 1168 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1169 | } else if (drv->bdrv_open) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1170 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1171 | } else { |
| 1172 | ret = 0; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | if (ret < 0) { |
| 1176 | if (local_err) { |
| 1177 | error_propagate(errp, local_err); |
| 1178 | } else if (bs->filename[0]) { |
| 1179 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
| 1180 | } else { |
| 1181 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1182 | } |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1183 | goto open_failed; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 1187 | if (ret < 0) { |
| 1188 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1189 | return ret; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | bdrv_refresh_limits(bs, &local_err); |
| 1193 | if (local_err) { |
| 1194 | error_propagate(errp, local_err); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1195 | return -EINVAL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1196 | } |
| 1197 | |
| 1198 | assert(bdrv_opt_mem_align(bs) != 0); |
| 1199 | assert(bdrv_min_mem_align(bs) != 0); |
| 1200 | assert(is_power_of_2(bs->bl.request_alignment)); |
| 1201 | |
| 1202 | return 0; |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1203 | open_failed: |
| 1204 | bs->drv = NULL; |
| 1205 | if (bs->file != NULL) { |
| 1206 | bdrv_unref_child(bs, bs->file); |
| 1207 | bs->file = NULL; |
| 1208 | } |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1209 | g_free(bs->opaque); |
| 1210 | bs->opaque = NULL; |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1211 | return ret; |
| 1212 | } |
| 1213 | |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1214 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
| 1215 | int flags, Error **errp) |
| 1216 | { |
| 1217 | BlockDriverState *bs; |
| 1218 | int ret; |
| 1219 | |
| 1220 | bs = bdrv_new(); |
| 1221 | bs->open_flags = flags; |
| 1222 | bs->explicit_options = qdict_new(); |
| 1223 | bs->options = qdict_new(); |
| 1224 | bs->opaque = NULL; |
| 1225 | |
| 1226 | update_options_from_flags(bs->options, flags); |
| 1227 | |
| 1228 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); |
| 1229 | if (ret < 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1230 | qobject_unref(bs->explicit_options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1231 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1232 | qobject_unref(bs->options); |
Manos Pitsidianakis | 180ca19 | 2017-07-14 17:35:48 +0300 | [diff] [blame] | 1233 | bs->options = NULL; |
Kevin Wolf | 680c7f9 | 2017-01-18 17:16:41 +0100 | [diff] [blame] | 1234 | bdrv_unref(bs); |
| 1235 | return NULL; |
| 1236 | } |
| 1237 | |
| 1238 | return bs; |
| 1239 | } |
| 1240 | |
Kevin Wolf | c5f3014 | 2016-10-06 11:33:17 +0200 | [diff] [blame] | 1241 | QemuOptsList bdrv_runtime_opts = { |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1242 | .name = "bdrv_common", |
| 1243 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 1244 | .desc = { |
| 1245 | { |
| 1246 | .name = "node-name", |
| 1247 | .type = QEMU_OPT_STRING, |
| 1248 | .help = "Node name of the block device node", |
| 1249 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1250 | { |
| 1251 | .name = "driver", |
| 1252 | .type = QEMU_OPT_STRING, |
| 1253 | .help = "Block driver to use for the node", |
| 1254 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1255 | { |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1256 | .name = BDRV_OPT_CACHE_DIRECT, |
| 1257 | .type = QEMU_OPT_BOOL, |
| 1258 | .help = "Bypass software writeback cache on the host", |
| 1259 | }, |
| 1260 | { |
| 1261 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 1262 | .type = QEMU_OPT_BOOL, |
| 1263 | .help = "Ignore flush requests", |
| 1264 | }, |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 1265 | { |
| 1266 | .name = BDRV_OPT_READ_ONLY, |
| 1267 | .type = QEMU_OPT_BOOL, |
| 1268 | .help = "Node is opened in read-only mode", |
| 1269 | }, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1270 | { |
| 1271 | .name = "detect-zeroes", |
| 1272 | .type = QEMU_OPT_STRING, |
| 1273 | .help = "try to optimize zero writes (off, on, unmap)", |
| 1274 | }, |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1275 | { |
| 1276 | .name = "discard", |
| 1277 | .type = QEMU_OPT_STRING, |
| 1278 | .help = "discard operation (ignore/off, unmap/on)", |
| 1279 | }, |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1280 | { |
| 1281 | .name = BDRV_OPT_FORCE_SHARE, |
| 1282 | .type = QEMU_OPT_BOOL, |
| 1283 | .help = "always accept other writers (default: off)", |
| 1284 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1285 | { /* end of list */ } |
| 1286 | }, |
| 1287 | }; |
| 1288 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1289 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1290 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1291 | * |
| 1292 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1293 | */ |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1294 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1295 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1296 | { |
| 1297 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 1298 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1299 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 1300 | const char *node_name = NULL; |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1301 | const char *discard; |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1302 | const char *detect_zeroes; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1303 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1304 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1305 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1306 | |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1307 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 1308 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1309 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1310 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 1311 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 1312 | if (local_err) { |
| 1313 | error_propagate(errp, local_err); |
| 1314 | ret = -EINVAL; |
| 1315 | goto fail_opts; |
| 1316 | } |
| 1317 | |
Alberto Garcia | 9b7e869 | 2016-09-15 17:53:01 +0300 | [diff] [blame] | 1318 | update_flags_from_options(&bs->open_flags, opts); |
| 1319 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1320 | driver_name = qemu_opt_get(opts, "driver"); |
| 1321 | drv = bdrv_find_format(driver_name); |
| 1322 | assert(drv != NULL); |
| 1323 | |
Fam Zheng | 5a9347c | 2017-05-03 00:35:37 +0800 | [diff] [blame] | 1324 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
| 1325 | |
| 1326 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { |
| 1327 | error_setg(errp, |
| 1328 | BDRV_OPT_FORCE_SHARE |
| 1329 | "=on can only be used with read-only images"); |
| 1330 | ret = -EINVAL; |
| 1331 | goto fail_opts; |
| 1332 | } |
| 1333 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1334 | if (file != NULL) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 1335 | filename = blk_bs(file)->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1336 | } else { |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1337 | /* |
| 1338 | * Caution: while qdict_get_try_str() is fine, getting |
| 1339 | * non-string types would require more care. When @options |
| 1340 | * come from -blockdev or blockdev_add, its members are typed |
| 1341 | * according to the QAPI schema, but when they come from |
| 1342 | * -drive, they're all QString. |
| 1343 | */ |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 1344 | filename = qdict_get_try_str(options, "filename"); |
| 1345 | } |
| 1346 | |
Max Reitz | 4a00824 | 2017-04-13 18:06:24 +0200 | [diff] [blame] | 1347 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 1348 | error_setg(errp, "The '%s' block driver requires a file name", |
| 1349 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1350 | ret = -EINVAL; |
| 1351 | goto fail_opts; |
| 1352 | } |
| 1353 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1354 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 1355 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1356 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1357 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1358 | |
| 1359 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8f94a6e | 2013-10-10 11:45:55 +0200 | [diff] [blame] | 1360 | error_setg(errp, |
| 1361 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 1362 | ? "Driver '%s' can only be used for read-only devices" |
| 1363 | : "Driver '%s' is not whitelisted", |
| 1364 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1365 | ret = -ENOTSUP; |
| 1366 | goto fail_opts; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 1367 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1368 | |
Paolo Bonzini | d3faa13 | 2017-06-05 14:38:50 +0200 | [diff] [blame] | 1369 | /* bdrv_new() and bdrv_close() make it so */ |
| 1370 | assert(atomic_read(&bs->copy_on_read) == 0); |
| 1371 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1372 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1373 | if (!bs->read_only) { |
| 1374 | bdrv_enable_copy_on_read(bs); |
| 1375 | } else { |
| 1376 | 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] | 1377 | ret = -EINVAL; |
| 1378 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 1379 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1380 | } |
| 1381 | |
Kevin Wolf | 818584a | 2016-09-12 18:03:18 +0200 | [diff] [blame] | 1382 | discard = qemu_opt_get(opts, "discard"); |
| 1383 | if (discard != NULL) { |
| 1384 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { |
| 1385 | error_setg(errp, "Invalid discard option"); |
| 1386 | ret = -EINVAL; |
| 1387 | goto fail_opts; |
| 1388 | } |
| 1389 | } |
| 1390 | |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1391 | detect_zeroes = qemu_opt_get(opts, "detect-zeroes"); |
| 1392 | if (detect_zeroes) { |
| 1393 | BlockdevDetectZeroesOptions value = |
Marc-André Lureau | f7abe0e | 2017-08-24 10:46:10 +0200 | [diff] [blame] | 1394 | qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1395 | detect_zeroes, |
Kevin Wolf | 692e01a | 2016-09-12 21:00:41 +0200 | [diff] [blame] | 1396 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, |
| 1397 | &local_err); |
| 1398 | if (local_err) { |
| 1399 | error_propagate(errp, local_err); |
| 1400 | ret = -EINVAL; |
| 1401 | goto fail_opts; |
| 1402 | } |
| 1403 | |
| 1404 | if (value == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && |
| 1405 | !(bs->open_flags & BDRV_O_UNMAP)) |
| 1406 | { |
| 1407 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " |
| 1408 | "without setting discard operation to unmap"); |
| 1409 | ret = -EINVAL; |
| 1410 | goto fail_opts; |
| 1411 | } |
| 1412 | |
| 1413 | bs->detect_zeroes = value; |
| 1414 | } |
| 1415 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 1416 | if (filename != NULL) { |
| 1417 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 1418 | } else { |
| 1419 | bs->filename[0] = '\0'; |
| 1420 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1421 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1422 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1423 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1424 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1425 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1426 | |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1427 | assert(!drv->bdrv_file_open || file == NULL); |
| 1428 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1429 | if (ret < 0) { |
Kevin Wolf | 01a5650 | 2017-01-18 15:51:56 +0100 | [diff] [blame] | 1430 | goto fail_opts; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1431 | } |
| 1432 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1433 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1434 | return 0; |
| 1435 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1436 | fail_opts: |
| 1437 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1438 | return ret; |
| 1439 | } |
| 1440 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1441 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1442 | { |
| 1443 | QObject *options_obj; |
| 1444 | QDict *options; |
| 1445 | int ret; |
| 1446 | |
| 1447 | ret = strstart(filename, "json:", &filename); |
| 1448 | assert(ret); |
| 1449 | |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1450 | options_obj = qobject_from_json(filename, errp); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1451 | if (!options_obj) { |
Markus Armbruster | 5577fff | 2017-02-28 22:26:59 +0100 | [diff] [blame] | 1452 | /* Work around qobject_from_json() lossage TODO fix that */ |
| 1453 | if (errp && !*errp) { |
| 1454 | error_setg(errp, "Could not parse the JSON options"); |
| 1455 | return NULL; |
| 1456 | } |
| 1457 | error_prepend(errp, "Could not parse the JSON options: "); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1458 | return NULL; |
| 1459 | } |
| 1460 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 1461 | options = qobject_to(QDict, options_obj); |
Markus Armbruster | ca6b6e1 | 2017-02-17 21:38:18 +0100 | [diff] [blame] | 1462 | if (!options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1463 | qobject_unref(options_obj); |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1464 | error_setg(errp, "Invalid JSON object given"); |
| 1465 | return NULL; |
| 1466 | } |
| 1467 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1468 | qdict_flatten(options); |
| 1469 | |
| 1470 | return options; |
| 1471 | } |
| 1472 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1473 | static void parse_json_protocol(QDict *options, const char **pfilename, |
| 1474 | Error **errp) |
| 1475 | { |
| 1476 | QDict *json_options; |
| 1477 | Error *local_err = NULL; |
| 1478 | |
| 1479 | /* Parse json: pseudo-protocol */ |
| 1480 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { |
| 1481 | return; |
| 1482 | } |
| 1483 | |
| 1484 | json_options = parse_json_filename(*pfilename, &local_err); |
| 1485 | if (local_err) { |
| 1486 | error_propagate(errp, local_err); |
| 1487 | return; |
| 1488 | } |
| 1489 | |
| 1490 | /* Options given in the filename have lower priority than options |
| 1491 | * specified directly */ |
| 1492 | qdict_join(options, json_options, false); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 1493 | qobject_unref(json_options); |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1494 | *pfilename = NULL; |
| 1495 | } |
| 1496 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1497 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1498 | * Fills in default options for opening images and converts the legacy |
| 1499 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1500 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 1501 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1502 | */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1503 | static int bdrv_fill_options(QDict **options, const char *filename, |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1504 | int *flags, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1505 | { |
| 1506 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1507 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1508 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1509 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1510 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1511 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1512 | /* |
| 1513 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 1514 | * types would require more care. When @options come from |
| 1515 | * -blockdev or blockdev_add, its members are typed according to |
| 1516 | * the QAPI schema, but when they come from -drive, they're all |
| 1517 | * QString. |
| 1518 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1519 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1520 | if (drvname) { |
| 1521 | drv = bdrv_find_format(drvname); |
| 1522 | if (!drv) { |
| 1523 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1524 | return -ENOENT; |
| 1525 | } |
| 1526 | /* If the user has explicitly specified the driver, this choice should |
| 1527 | * override the BDRV_O_PROTOCOL flag */ |
| 1528 | protocol = drv->bdrv_file_open; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1529 | } |
| 1530 | |
| 1531 | if (protocol) { |
| 1532 | *flags |= BDRV_O_PROTOCOL; |
| 1533 | } else { |
| 1534 | *flags &= ~BDRV_O_PROTOCOL; |
| 1535 | } |
| 1536 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1537 | /* Translate cache options from flags into options */ |
| 1538 | update_options_from_flags(*options, *flags); |
| 1539 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1540 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1541 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1542 | if (!qdict_haskey(*options, "filename")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1543 | qdict_put_str(*options, "filename", filename); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1544 | parse_filename = true; |
| 1545 | } else { |
| 1546 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1547 | "the same time"); |
| 1548 | return -EINVAL; |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | /* Find the right block driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 1553 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1554 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1555 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1556 | if (!drvname && protocol) { |
| 1557 | if (filename) { |
| 1558 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 1559 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1560 | return -EINVAL; |
| 1561 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1562 | |
| 1563 | drvname = drv->format_name; |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 1564 | qdict_put_str(*options, "driver", drvname); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1565 | } else { |
| 1566 | error_setg(errp, "Must specify either driver or file"); |
| 1567 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1568 | } |
| 1569 | } |
| 1570 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1571 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1572 | |
| 1573 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1574 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1575 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1576 | if (local_err) { |
| 1577 | error_propagate(errp, local_err); |
| 1578 | return -EINVAL; |
| 1579 | } |
| 1580 | |
| 1581 | if (!drv->bdrv_needs_filename) { |
| 1582 | qdict_del(*options, "filename"); |
| 1583 | } |
| 1584 | } |
| 1585 | |
| 1586 | return 0; |
| 1587 | } |
| 1588 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1589 | static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q, |
| 1590 | uint64_t perm, uint64_t shared, |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1591 | GSList *ignore_children, Error **errp); |
| 1592 | static void bdrv_child_abort_perm_update(BdrvChild *c); |
| 1593 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared); |
| 1594 | |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1595 | typedef struct BlockReopenQueueEntry { |
| 1596 | bool prepared; |
| 1597 | BDRVReopenState state; |
| 1598 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1599 | } BlockReopenQueueEntry; |
| 1600 | |
| 1601 | /* |
| 1602 | * Return the flags that @bs will have after the reopens in @q have |
| 1603 | * successfully completed. If @q is NULL (or @bs is not contained in @q), |
| 1604 | * return the current flags. |
| 1605 | */ |
| 1606 | static int bdrv_reopen_get_flags(BlockReopenQueue *q, BlockDriverState *bs) |
| 1607 | { |
| 1608 | BlockReopenQueueEntry *entry; |
| 1609 | |
| 1610 | if (q != NULL) { |
| 1611 | QSIMPLEQ_FOREACH(entry, q, entry) { |
| 1612 | if (entry->state.bs == bs) { |
| 1613 | return entry->state.flags; |
| 1614 | } |
| 1615 | } |
| 1616 | } |
| 1617 | |
| 1618 | return bs->open_flags; |
| 1619 | } |
| 1620 | |
| 1621 | /* Returns whether the image file can be written to after the reopen queue @q |
| 1622 | * has been successfully applied, or right now if @q is NULL. */ |
| 1623 | static bool bdrv_is_writable(BlockDriverState *bs, BlockReopenQueue *q) |
| 1624 | { |
| 1625 | int flags = bdrv_reopen_get_flags(q, bs); |
| 1626 | |
| 1627 | return (flags & (BDRV_O_RDWR | BDRV_O_INACTIVE)) == BDRV_O_RDWR; |
| 1628 | } |
| 1629 | |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1630 | static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1631 | BdrvChild *c, const BdrvChildRole *role, |
| 1632 | BlockReopenQueue *reopen_queue, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1633 | uint64_t parent_perm, uint64_t parent_shared, |
| 1634 | uint64_t *nperm, uint64_t *nshared) |
| 1635 | { |
| 1636 | if (bs->drv && bs->drv->bdrv_child_perm) { |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1637 | bs->drv->bdrv_child_perm(bs, c, role, reopen_queue, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1638 | parent_perm, parent_shared, |
| 1639 | nperm, nshared); |
| 1640 | } |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1641 | /* TODO Take force_share from reopen_queue */ |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1642 | if (child_bs && child_bs->force_share) { |
| 1643 | *nshared = BLK_PERM_ALL; |
| 1644 | } |
| 1645 | } |
| 1646 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1647 | /* |
| 1648 | * Check whether permissions on this node can be changed in a way that |
| 1649 | * @cumulative_perms and @cumulative_shared_perms are the new cumulative |
| 1650 | * permissions of all its parents. This involves checking whether all necessary |
| 1651 | * permission changes to child nodes can be performed. |
| 1652 | * |
| 1653 | * A call to this function must always be followed by a call to bdrv_set_perm() |
| 1654 | * or bdrv_abort_perm_update(). |
| 1655 | */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1656 | static int bdrv_check_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 1657 | uint64_t cumulative_perms, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1658 | uint64_t cumulative_shared_perms, |
| 1659 | GSList *ignore_children, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1660 | { |
| 1661 | BlockDriver *drv = bs->drv; |
| 1662 | BdrvChild *c; |
| 1663 | int ret; |
| 1664 | |
| 1665 | /* Write permissions never work with read-only images */ |
| 1666 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1667 | !bdrv_is_writable(bs, q)) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1668 | { |
| 1669 | error_setg(errp, "Block node is read-only"); |
| 1670 | return -EPERM; |
| 1671 | } |
| 1672 | |
| 1673 | /* Check this node */ |
| 1674 | if (!drv) { |
| 1675 | return 0; |
| 1676 | } |
| 1677 | |
| 1678 | if (drv->bdrv_check_perm) { |
| 1679 | return drv->bdrv_check_perm(bs, cumulative_perms, |
| 1680 | cumulative_shared_perms, errp); |
| 1681 | } |
| 1682 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1683 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1684 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1685 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1686 | return 0; |
| 1687 | } |
| 1688 | |
| 1689 | /* Check all children */ |
| 1690 | QLIST_FOREACH(c, &bs->children, next) { |
| 1691 | uint64_t cur_perm, cur_shared; |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1692 | bdrv_child_perm(bs, c->bs, c, c->role, q, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1693 | cumulative_perms, cumulative_shared_perms, |
| 1694 | &cur_perm, &cur_shared); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1695 | ret = bdrv_child_check_perm(c, q, cur_perm, cur_shared, |
| 1696 | ignore_children, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1697 | if (ret < 0) { |
| 1698 | return ret; |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | return 0; |
| 1703 | } |
| 1704 | |
| 1705 | /* |
| 1706 | * Notifies drivers that after a previous bdrv_check_perm() call, the |
| 1707 | * permission update is not performed and any preparations made for it (e.g. |
| 1708 | * taken file locks) need to be undone. |
| 1709 | * |
| 1710 | * This function recursively notifies all child nodes. |
| 1711 | */ |
| 1712 | static void bdrv_abort_perm_update(BlockDriverState *bs) |
| 1713 | { |
| 1714 | BlockDriver *drv = bs->drv; |
| 1715 | BdrvChild *c; |
| 1716 | |
| 1717 | if (!drv) { |
| 1718 | return; |
| 1719 | } |
| 1720 | |
| 1721 | if (drv->bdrv_abort_perm_update) { |
| 1722 | drv->bdrv_abort_perm_update(bs); |
| 1723 | } |
| 1724 | |
| 1725 | QLIST_FOREACH(c, &bs->children, next) { |
| 1726 | bdrv_child_abort_perm_update(c); |
| 1727 | } |
| 1728 | } |
| 1729 | |
| 1730 | static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms, |
| 1731 | uint64_t cumulative_shared_perms) |
| 1732 | { |
| 1733 | BlockDriver *drv = bs->drv; |
| 1734 | BdrvChild *c; |
| 1735 | |
| 1736 | if (!drv) { |
| 1737 | return; |
| 1738 | } |
| 1739 | |
| 1740 | /* Update this node */ |
| 1741 | if (drv->bdrv_set_perm) { |
| 1742 | drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); |
| 1743 | } |
| 1744 | |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1745 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1746 | if (!drv->bdrv_child_perm) { |
Kevin Wolf | 78e421c | 2016-12-20 23:25:12 +0100 | [diff] [blame] | 1747 | assert(QLIST_EMPTY(&bs->children)); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1748 | return; |
| 1749 | } |
| 1750 | |
| 1751 | /* Update all children */ |
| 1752 | QLIST_FOREACH(c, &bs->children, next) { |
| 1753 | uint64_t cur_perm, cur_shared; |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1754 | bdrv_child_perm(bs, c->bs, c, c->role, NULL, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 1755 | cumulative_perms, cumulative_shared_perms, |
| 1756 | &cur_perm, &cur_shared); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1757 | bdrv_child_set_perm(c, cur_perm, cur_shared); |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | static void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, |
| 1762 | uint64_t *shared_perm) |
| 1763 | { |
| 1764 | BdrvChild *c; |
| 1765 | uint64_t cumulative_perms = 0; |
| 1766 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 1767 | |
| 1768 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 1769 | cumulative_perms |= c->perm; |
| 1770 | cumulative_shared_perms &= c->shared_perm; |
| 1771 | } |
| 1772 | |
| 1773 | *perm = cumulative_perms; |
| 1774 | *shared_perm = cumulative_shared_perms; |
| 1775 | } |
| 1776 | |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1777 | static char *bdrv_child_user_desc(BdrvChild *c) |
| 1778 | { |
| 1779 | if (c->role->get_parent_desc) { |
| 1780 | return c->role->get_parent_desc(c); |
| 1781 | } |
| 1782 | |
| 1783 | return g_strdup("another user"); |
| 1784 | } |
| 1785 | |
Fam Zheng | 5176196 | 2017-05-03 00:35:36 +0800 | [diff] [blame] | 1786 | char *bdrv_perm_names(uint64_t perm) |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1787 | { |
| 1788 | struct perm_name { |
| 1789 | uint64_t perm; |
| 1790 | const char *name; |
| 1791 | } permissions[] = { |
| 1792 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, |
| 1793 | { BLK_PERM_WRITE, "write" }, |
| 1794 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, |
| 1795 | { BLK_PERM_RESIZE, "resize" }, |
| 1796 | { BLK_PERM_GRAPH_MOD, "change children" }, |
| 1797 | { 0, NULL } |
| 1798 | }; |
| 1799 | |
| 1800 | char *result = g_strdup(""); |
| 1801 | struct perm_name *p; |
| 1802 | |
| 1803 | for (p = permissions; p->name; p++) { |
| 1804 | if (perm & p->perm) { |
| 1805 | char *old = result; |
| 1806 | result = g_strdup_printf("%s%s%s", old, *old ? ", " : "", p->name); |
| 1807 | g_free(old); |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | return result; |
| 1812 | } |
| 1813 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1814 | /* |
| 1815 | * 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] | 1816 | * @new_used_perm/@new_shared_perm as its permissions. If @ignore_children is |
| 1817 | * set, the BdrvChild objects in this list are ignored in the calculations; |
| 1818 | * this allows checking permission updates for an existing reference. |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1819 | * |
| 1820 | * Needs to be followed by a call to either bdrv_set_perm() or |
| 1821 | * bdrv_abort_perm_update(). */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1822 | static int bdrv_check_update_perm(BlockDriverState *bs, BlockReopenQueue *q, |
| 1823 | uint64_t new_used_perm, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1824 | uint64_t new_shared_perm, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1825 | GSList *ignore_children, Error **errp) |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1826 | { |
| 1827 | BdrvChild *c; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1828 | uint64_t cumulative_perms = new_used_perm; |
| 1829 | uint64_t cumulative_shared_perms = new_shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1830 | |
| 1831 | /* There is no reason why anyone couldn't tolerate write_unchanged */ |
| 1832 | assert(new_shared_perm & BLK_PERM_WRITE_UNCHANGED); |
| 1833 | |
| 1834 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1835 | if (g_slist_find(ignore_children, c)) { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1836 | continue; |
| 1837 | } |
| 1838 | |
Kevin Wolf | d083319 | 2017-01-16 18:26:20 +0100 | [diff] [blame] | 1839 | if ((new_used_perm & c->shared_perm) != new_used_perm) { |
| 1840 | char *user = bdrv_child_user_desc(c); |
| 1841 | char *perm_names = bdrv_perm_names(new_used_perm & ~c->shared_perm); |
| 1842 | error_setg(errp, "Conflicts with use by %s as '%s', which does not " |
| 1843 | "allow '%s' on %s", |
| 1844 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); |
| 1845 | g_free(user); |
| 1846 | g_free(perm_names); |
| 1847 | return -EPERM; |
| 1848 | } |
| 1849 | |
| 1850 | if ((c->perm & new_shared_perm) != c->perm) { |
| 1851 | char *user = bdrv_child_user_desc(c); |
| 1852 | char *perm_names = bdrv_perm_names(c->perm & ~new_shared_perm); |
| 1853 | error_setg(errp, "Conflicts with use by %s as '%s', which uses " |
| 1854 | "'%s' on %s", |
| 1855 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); |
| 1856 | g_free(user); |
| 1857 | g_free(perm_names); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1858 | return -EPERM; |
| 1859 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1860 | |
| 1861 | cumulative_perms |= c->perm; |
| 1862 | cumulative_shared_perms &= c->shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1863 | } |
| 1864 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1865 | return bdrv_check_perm(bs, q, cumulative_perms, cumulative_shared_perms, |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1866 | ignore_children, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1867 | } |
| 1868 | |
| 1869 | /* Needs to be followed by a call to either bdrv_child_set_perm() or |
| 1870 | * bdrv_child_abort_perm_update(). */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1871 | static int bdrv_child_check_perm(BdrvChild *c, BlockReopenQueue *q, |
| 1872 | uint64_t perm, uint64_t shared, |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1873 | GSList *ignore_children, Error **errp) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1874 | { |
Kevin Wolf | 4618112 | 2017-03-06 15:00:13 +0100 | [diff] [blame] | 1875 | int ret; |
| 1876 | |
| 1877 | ignore_children = g_slist_prepend(g_slist_copy(ignore_children), c); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1878 | 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] | 1879 | g_slist_free(ignore_children); |
| 1880 | |
| 1881 | return ret; |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1882 | } |
| 1883 | |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1884 | 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] | 1885 | { |
| 1886 | uint64_t cumulative_perms, cumulative_shared_perms; |
| 1887 | |
| 1888 | c->perm = perm; |
| 1889 | c->shared_perm = shared; |
| 1890 | |
| 1891 | bdrv_get_cumulative_perm(c->bs, &cumulative_perms, |
| 1892 | &cumulative_shared_perms); |
| 1893 | bdrv_set_perm(c->bs, cumulative_perms, cumulative_shared_perms); |
| 1894 | } |
| 1895 | |
Fam Zheng | c1cef67 | 2017-03-14 10:30:50 +0800 | [diff] [blame] | 1896 | static void bdrv_child_abort_perm_update(BdrvChild *c) |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1897 | { |
| 1898 | bdrv_abort_perm_update(c->bs); |
| 1899 | } |
| 1900 | |
| 1901 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
| 1902 | Error **errp) |
| 1903 | { |
| 1904 | int ret; |
| 1905 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 1906 | ret = bdrv_child_check_perm(c, NULL, perm, shared, NULL, errp); |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 1907 | if (ret < 0) { |
| 1908 | bdrv_child_abort_perm_update(c); |
| 1909 | return ret; |
| 1910 | } |
| 1911 | |
| 1912 | bdrv_child_set_perm(c, perm, shared); |
| 1913 | |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 1914 | return 0; |
| 1915 | } |
| 1916 | |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 1917 | #define DEFAULT_PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \ |
| 1918 | | BLK_PERM_WRITE \ |
| 1919 | | BLK_PERM_WRITE_UNCHANGED \ |
| 1920 | | BLK_PERM_RESIZE) |
| 1921 | #define DEFAULT_PERM_UNCHANGED (BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH) |
| 1922 | |
| 1923 | void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, |
| 1924 | const BdrvChildRole *role, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1925 | BlockReopenQueue *reopen_queue, |
Kevin Wolf | 6a1b9ee | 2016-12-15 11:27:32 +0100 | [diff] [blame] | 1926 | uint64_t perm, uint64_t shared, |
| 1927 | uint64_t *nperm, uint64_t *nshared) |
| 1928 | { |
| 1929 | if (c == NULL) { |
| 1930 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; |
| 1931 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; |
| 1932 | return; |
| 1933 | } |
| 1934 | |
| 1935 | *nperm = (perm & DEFAULT_PERM_PASSTHROUGH) | |
| 1936 | (c->perm & DEFAULT_PERM_UNCHANGED); |
| 1937 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | |
| 1938 | (c->shared_perm & DEFAULT_PERM_UNCHANGED); |
| 1939 | } |
| 1940 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1941 | void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, |
| 1942 | const BdrvChildRole *role, |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1943 | BlockReopenQueue *reopen_queue, |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1944 | uint64_t perm, uint64_t shared, |
| 1945 | uint64_t *nperm, uint64_t *nshared) |
| 1946 | { |
| 1947 | bool backing = (role == &child_backing); |
| 1948 | assert(role == &child_backing || role == &child_file); |
| 1949 | |
| 1950 | if (!backing) { |
Kevin Wolf | 5fbfabd | 2017-11-30 17:38:43 +0100 | [diff] [blame] | 1951 | int flags = bdrv_reopen_get_flags(reopen_queue, bs); |
| 1952 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1953 | /* Apart from the modifications below, the same permissions are |
| 1954 | * forwarded and left alone as for filters */ |
Kevin Wolf | e0995dc | 2017-09-14 12:47:11 +0200 | [diff] [blame] | 1955 | bdrv_filter_default_perms(bs, c, role, reopen_queue, perm, shared, |
| 1956 | &perm, &shared); |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1957 | |
| 1958 | /* Format drivers may touch metadata even if the guest doesn't write */ |
Kevin Wolf | 148eb13 | 2017-09-14 14:32:04 +0200 | [diff] [blame] | 1959 | if (bdrv_is_writable(bs, reopen_queue)) { |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1960 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 1961 | } |
| 1962 | |
| 1963 | /* bs->file always needs to be consistent because of the metadata. We |
| 1964 | * can never allow other users to resize or write to it. */ |
Kevin Wolf | 5fbfabd | 2017-11-30 17:38:43 +0100 | [diff] [blame] | 1965 | if (!(flags & BDRV_O_NO_IO)) { |
| 1966 | perm |= BLK_PERM_CONSISTENT_READ; |
| 1967 | } |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1968 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); |
| 1969 | } else { |
| 1970 | /* We want consistent read from backing files if the parent needs it. |
| 1971 | * No other operations are performed on backing files. */ |
| 1972 | perm &= BLK_PERM_CONSISTENT_READ; |
| 1973 | |
| 1974 | /* If the parent can deal with changing data, we're okay with a |
| 1975 | * writable and resizable backing file. */ |
| 1976 | /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */ |
| 1977 | if (shared & BLK_PERM_WRITE) { |
| 1978 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 1979 | } else { |
| 1980 | shared = 0; |
| 1981 | } |
| 1982 | |
| 1983 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD | |
| 1984 | BLK_PERM_WRITE_UNCHANGED; |
| 1985 | } |
| 1986 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 1987 | if (bs->open_flags & BDRV_O_INACTIVE) { |
| 1988 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
| 1989 | } |
| 1990 | |
Kevin Wolf | 6b1a044 | 2016-12-19 15:21:48 +0100 | [diff] [blame] | 1991 | *nperm = perm; |
| 1992 | *nshared = shared; |
| 1993 | } |
| 1994 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 1995 | static void bdrv_replace_child_noperm(BdrvChild *child, |
| 1996 | BlockDriverState *new_bs) |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 1997 | { |
| 1998 | BlockDriverState *old_bs = child->bs; |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 1999 | int i; |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2000 | |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2001 | if (old_bs && new_bs) { |
| 2002 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); |
| 2003 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2004 | if (old_bs) { |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2005 | /* Detach first so that the recursive drain sections coming from @child |
| 2006 | * are already gone and we only end the drain sections that came from |
| 2007 | * elsewhere. */ |
| 2008 | if (child->role->detach) { |
| 2009 | child->role->detach(child); |
| 2010 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2011 | if (old_bs->quiesce_counter && child->role->drained_end) { |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 2012 | for (i = 0; i < old_bs->quiesce_counter; i++) { |
| 2013 | child->role->drained_end(child); |
| 2014 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2015 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2016 | QLIST_REMOVE(child, next_parent); |
| 2017 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2018 | |
| 2019 | child->bs = new_bs; |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2020 | |
| 2021 | if (new_bs) { |
| 2022 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); |
| 2023 | if (new_bs->quiesce_counter && child->role->drained_begin) { |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 2024 | for (i = 0; i < new_bs->quiesce_counter; i++) { |
| 2025 | child->role->drained_begin(child); |
| 2026 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2027 | } |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2028 | |
Kevin Wolf | d736f11 | 2017-12-18 16:05:48 +0100 | [diff] [blame] | 2029 | /* Attach only after starting new drained sections, so that recursive |
| 2030 | * drain sections coming from @child don't get an extra .drained_begin |
| 2031 | * callback. */ |
Kevin Wolf | db95dbb | 2017-02-08 11:28:52 +0100 | [diff] [blame] | 2032 | if (child->role->attach) { |
| 2033 | child->role->attach(child); |
| 2034 | } |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2035 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2036 | } |
| 2037 | |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2038 | /* |
| 2039 | * Updates @child to change its reference to point to @new_bs, including |
| 2040 | * checking and applying the necessary permisson updates both to the old node |
| 2041 | * and to @new_bs. |
| 2042 | * |
| 2043 | * NULL is passed as @new_bs for removing the reference before freeing @child. |
| 2044 | * |
| 2045 | * If @new_bs is not NULL, bdrv_check_perm() must be called beforehand, as this |
| 2046 | * function uses bdrv_set_perm() to update the permissions according to the new |
| 2047 | * reference that @new_bs gets. |
| 2048 | */ |
| 2049 | static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs) |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2050 | { |
| 2051 | BlockDriverState *old_bs = child->bs; |
| 2052 | uint64_t perm, shared_perm; |
| 2053 | |
Kevin Wolf | 8aecf1d | 2017-08-03 17:02:57 +0200 | [diff] [blame] | 2054 | bdrv_replace_child_noperm(child, new_bs); |
| 2055 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2056 | if (old_bs) { |
| 2057 | /* Update permissions for old node. This is guaranteed to succeed |
| 2058 | * because we're just taking a parent away, so we're loosening |
| 2059 | * restrictions. */ |
| 2060 | bdrv_get_cumulative_perm(old_bs, &perm, &shared_perm); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 2061 | bdrv_check_perm(old_bs, NULL, perm, shared_perm, NULL, &error_abort); |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2062 | bdrv_set_perm(old_bs, perm, shared_perm); |
| 2063 | } |
| 2064 | |
Kevin Wolf | 8ee0399 | 2017-03-06 13:45:28 +0100 | [diff] [blame] | 2065 | if (new_bs) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2066 | bdrv_get_cumulative_perm(new_bs, &perm, &shared_perm); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2067 | bdrv_set_perm(new_bs, perm, shared_perm); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 2068 | } |
| 2069 | } |
| 2070 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2071 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
| 2072 | const char *child_name, |
Kevin Wolf | 36fe133 | 2016-05-17 14:51:55 +0200 | [diff] [blame] | 2073 | const BdrvChildRole *child_role, |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2074 | uint64_t perm, uint64_t shared_perm, |
| 2075 | void *opaque, Error **errp) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2076 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2077 | BdrvChild *child; |
| 2078 | int ret; |
| 2079 | |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 2080 | 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] | 2081 | if (ret < 0) { |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2082 | bdrv_abort_perm_update(child_bs); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2083 | return NULL; |
| 2084 | } |
| 2085 | |
| 2086 | child = g_new(BdrvChild, 1); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2087 | *child = (BdrvChild) { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2088 | .bs = NULL, |
| 2089 | .name = g_strdup(child_name), |
| 2090 | .role = child_role, |
| 2091 | .perm = perm, |
| 2092 | .shared_perm = shared_perm, |
| 2093 | .opaque = opaque, |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2094 | }; |
| 2095 | |
Kevin Wolf | 33a610c | 2016-12-15 13:04:20 +0100 | [diff] [blame] | 2096 | /* This performs the matching bdrv_set_perm() for the above check. */ |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2097 | bdrv_replace_child(child, child_bs); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2098 | |
| 2099 | return child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2100 | } |
| 2101 | |
Wen Congyang | 98292c6 | 2016-05-10 15:36:38 +0800 | [diff] [blame] | 2102 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 2103 | BlockDriverState *child_bs, |
| 2104 | const char *child_name, |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2105 | const BdrvChildRole *child_role, |
| 2106 | Error **errp) |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2107 | { |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2108 | BdrvChild *child; |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2109 | uint64_t perm, shared_perm; |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2110 | |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2111 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); |
| 2112 | |
| 2113 | assert(parent_bs->drv); |
Fam Zheng | bb2614e | 2017-04-07 14:54:10 +0800 | [diff] [blame] | 2114 | 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] | 2115 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, NULL, |
Fam Zheng | ffd1a5a | 2017-05-03 00:35:38 +0800 | [diff] [blame] | 2116 | perm, shared_perm, &perm, &shared_perm); |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2117 | |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2118 | child = bdrv_root_attach_child(child_bs, child_name, child_role, |
Kevin Wolf | f68c598 | 2016-12-20 15:51:12 +0100 | [diff] [blame] | 2119 | perm, shared_perm, parent_bs, errp); |
Kevin Wolf | d5e6f43 | 2016-12-14 17:24:36 +0100 | [diff] [blame] | 2120 | if (child == NULL) { |
| 2121 | return NULL; |
| 2122 | } |
| 2123 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2124 | QLIST_INSERT_HEAD(&parent_bs->children, child, next); |
| 2125 | return child; |
| 2126 | } |
| 2127 | |
Kevin Wolf | 3f09bfb | 2015-09-15 11:58:23 +0200 | [diff] [blame] | 2128 | static void bdrv_detach_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2129 | { |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2130 | if (child->next.le_prev) { |
| 2131 | QLIST_REMOVE(child, next); |
| 2132 | child->next.le_prev = NULL; |
| 2133 | } |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2134 | |
Kevin Wolf | 466787f | 2017-03-08 14:44:07 +0100 | [diff] [blame] | 2135 | bdrv_replace_child(child, NULL); |
Kevin Wolf | e9740bc | 2016-05-23 15:52:26 +0200 | [diff] [blame] | 2136 | |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 2137 | g_free(child->name); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2138 | g_free(child); |
| 2139 | } |
| 2140 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2141 | void bdrv_root_unref_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2142 | { |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 2143 | BlockDriverState *child_bs; |
| 2144 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2145 | child_bs = child->bs; |
| 2146 | bdrv_detach_child(child); |
| 2147 | bdrv_unref(child_bs); |
| 2148 | } |
| 2149 | |
| 2150 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 2151 | { |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 2152 | if (child == NULL) { |
| 2153 | return; |
| 2154 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2155 | |
| 2156 | if (child->bs->inherits_from == parent) { |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2157 | BdrvChild *c; |
| 2158 | |
| 2159 | /* Remove inherits_from only when the last reference between parent and |
| 2160 | * child->bs goes away. */ |
| 2161 | QLIST_FOREACH(c, &parent->children, next) { |
| 2162 | if (c != child && c->bs == child->bs) { |
| 2163 | break; |
| 2164 | } |
| 2165 | } |
| 2166 | if (c == NULL) { |
| 2167 | child->bs->inherits_from = NULL; |
| 2168 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2169 | } |
| 2170 | |
Kevin Wolf | f21d96d | 2016-03-08 13:47:46 +0100 | [diff] [blame] | 2171 | bdrv_root_unref_child(child); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2172 | } |
| 2173 | |
Kevin Wolf | 5c8cab4 | 2016-02-24 15:13:35 +0100 | [diff] [blame] | 2174 | |
| 2175 | static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) |
| 2176 | { |
| 2177 | BdrvChild *c; |
| 2178 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2179 | if (c->role->change_media) { |
| 2180 | c->role->change_media(c, load); |
| 2181 | } |
| 2182 | } |
| 2183 | } |
| 2184 | |
| 2185 | static void bdrv_parent_cb_resize(BlockDriverState *bs) |
| 2186 | { |
| 2187 | BdrvChild *c; |
| 2188 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 2189 | if (c->role->resize) { |
| 2190 | c->role->resize(c); |
| 2191 | } |
| 2192 | } |
| 2193 | } |
| 2194 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2195 | /* |
| 2196 | * Sets the backing file link of a BDS. A new reference is created; callers |
| 2197 | * which don't need their own reference any more must call bdrv_unref(). |
| 2198 | */ |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2199 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
| 2200 | Error **errp) |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2201 | { |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2202 | if (backing_hd) { |
| 2203 | bdrv_ref(backing_hd); |
| 2204 | } |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2205 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2206 | if (bs->backing) { |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2207 | bdrv_unref_child(bs, bs->backing); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 2208 | } |
| 2209 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2210 | if (!backing_hd) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2211 | bs->backing = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2212 | goto out; |
| 2213 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2214 | |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2215 | bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing, |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2216 | errp); |
| 2217 | if (!bs->backing) { |
| 2218 | bdrv_unref(backing_hd); |
| 2219 | } |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 2220 | |
Kevin Wolf | 9e7e940 | 2017-03-09 11:45:39 +0100 | [diff] [blame] | 2221 | bdrv_refresh_filename(bs); |
| 2222 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2223 | out: |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 2224 | bdrv_refresh_limits(bs, NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2225 | } |
| 2226 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2227 | /* |
| 2228 | * Opens the backing file for a BlockDriverState if not yet open |
| 2229 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2230 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 2231 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 2232 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 2233 | * BlockdevRef. |
| 2234 | * |
| 2235 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2236 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2237 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 2238 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2239 | { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2240 | char *backing_filename = g_malloc0(PATH_MAX); |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2241 | char *bdref_key_dot; |
| 2242 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 2243 | int ret = 0; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2244 | BlockDriverState *backing_hd; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2245 | QDict *options; |
| 2246 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 2247 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2248 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2249 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2250 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2251 | } |
| 2252 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2253 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2254 | if (parent_options == NULL) { |
| 2255 | tmp_parent_options = qdict_new(); |
| 2256 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 2257 | } |
| 2258 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2259 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2260 | |
| 2261 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 2262 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 2263 | g_free(bdref_key_dot); |
| 2264 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2265 | /* |
| 2266 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2267 | * types would require more care. When @parent_options come from |
| 2268 | * -blockdev or blockdev_add, its members are typed according to |
| 2269 | * the QAPI schema, but when they come from -drive, they're all |
| 2270 | * QString. |
| 2271 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2272 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 2273 | if (reference || qdict_haskey(options, "file.filename")) { |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 2274 | backing_filename[0] = '\0'; |
| 2275 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2276 | qobject_unref(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2277 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 2278 | } else { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 2279 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
| 2280 | &local_err); |
| 2281 | if (local_err) { |
| 2282 | ret = -EINVAL; |
| 2283 | error_propagate(errp, local_err); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2284 | qobject_unref(options); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 2285 | goto free_exit; |
| 2286 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2287 | } |
| 2288 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 2289 | if (!bs->drv || !bs->drv->supports_backing) { |
| 2290 | ret = -EINVAL; |
| 2291 | error_setg(errp, "Driver doesn't support backing files"); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2292 | qobject_unref(options); |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 2293 | goto free_exit; |
| 2294 | } |
| 2295 | |
Peter Krempa | 6bff597 | 2017-10-12 16:14:10 +0200 | [diff] [blame] | 2296 | if (!reference && |
| 2297 | bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2298 | qdict_put_str(options, "driver", bs->backing_format); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2299 | } |
| 2300 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2301 | backing_hd = bdrv_open_inherit(*backing_filename ? backing_filename : NULL, |
| 2302 | reference, options, 0, bs, &child_backing, |
| 2303 | errp); |
| 2304 | if (!backing_hd) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2305 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2306 | error_prepend(errp, "Could not open backing file: "); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2307 | ret = -EINVAL; |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2308 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2309 | } |
sochin.jiang | 5ce6bfe | 2017-06-26 19:04:24 +0800 | [diff] [blame] | 2310 | bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs)); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2311 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2312 | /* Hook up the backing file link; drop our reference, bs owns the |
| 2313 | * backing_hd reference now */ |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2314 | bdrv_set_backing_hd(bs, backing_hd, &local_err); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2315 | bdrv_unref(backing_hd); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2316 | if (local_err) { |
Fam Zheng | 8cd1a3e | 2017-03-17 09:56:30 +0800 | [diff] [blame] | 2317 | error_propagate(errp, local_err); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 2318 | ret = -EINVAL; |
| 2319 | goto free_exit; |
| 2320 | } |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 2321 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2322 | qdict_del(parent_options, bdref_key); |
| 2323 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2324 | free_exit: |
| 2325 | g_free(backing_filename); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2326 | qobject_unref(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2327 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2328 | } |
| 2329 | |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2330 | static BlockDriverState * |
| 2331 | bdrv_open_child_bs(const char *filename, QDict *options, const char *bdref_key, |
| 2332 | BlockDriverState *parent, const BdrvChildRole *child_role, |
| 2333 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2334 | { |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2335 | BlockDriverState *bs = NULL; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2336 | QDict *image_options; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2337 | char *bdref_key_dot; |
| 2338 | const char *reference; |
| 2339 | |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2340 | assert(child_role != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2341 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2342 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 2343 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 2344 | g_free(bdref_key_dot); |
| 2345 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2346 | /* |
| 2347 | * Caution: while qdict_get_try_str() is fine, getting non-string |
| 2348 | * types would require more care. When @options come from |
| 2349 | * -blockdev or blockdev_add, its members are typed according to |
| 2350 | * the QAPI schema, but when they come from -drive, they're all |
| 2351 | * QString. |
| 2352 | */ |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2353 | reference = qdict_get_try_str(options, bdref_key); |
| 2354 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2355 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2356 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 2357 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2358 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2359 | qobject_unref(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2360 | goto done; |
| 2361 | } |
| 2362 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2363 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
| 2364 | parent, child_role, errp); |
| 2365 | if (!bs) { |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 2366 | goto done; |
| 2367 | } |
| 2368 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2369 | done: |
| 2370 | qdict_del(options, bdref_key); |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2371 | return bs; |
| 2372 | } |
| 2373 | |
| 2374 | /* |
| 2375 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 2376 | * device's options. |
| 2377 | * |
| 2378 | * If allow_none is true, no image will be opened if filename is false and no |
| 2379 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
| 2380 | * |
| 2381 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 2382 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 2383 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 2384 | * BlockdevRef. |
| 2385 | * |
| 2386 | * The BlockdevRef will be removed from the options QDict. |
| 2387 | */ |
| 2388 | BdrvChild *bdrv_open_child(const char *filename, |
| 2389 | QDict *options, const char *bdref_key, |
| 2390 | BlockDriverState *parent, |
| 2391 | const BdrvChildRole *child_role, |
| 2392 | bool allow_none, Error **errp) |
| 2393 | { |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2394 | BdrvChild *c; |
Kevin Wolf | 2d6b86a | 2017-02-17 17:43:59 +0100 | [diff] [blame] | 2395 | BlockDriverState *bs; |
| 2396 | |
| 2397 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_role, |
| 2398 | allow_none, errp); |
| 2399 | if (bs == NULL) { |
| 2400 | return NULL; |
| 2401 | } |
| 2402 | |
Kevin Wolf | 8b2ff52 | 2016-12-20 22:21:17 +0100 | [diff] [blame] | 2403 | c = bdrv_attach_child(parent, bs, bdref_key, child_role, errp); |
| 2404 | if (!c) { |
| 2405 | bdrv_unref(bs); |
| 2406 | return NULL; |
| 2407 | } |
| 2408 | |
| 2409 | return c; |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 2410 | } |
| 2411 | |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2412 | /* TODO Future callers may need to specify parent/child_role in order for |
| 2413 | * option inheritance to work. Existing callers use it for the root node. */ |
| 2414 | BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp) |
| 2415 | { |
| 2416 | BlockDriverState *bs = NULL; |
| 2417 | Error *local_err = NULL; |
| 2418 | QObject *obj = NULL; |
| 2419 | QDict *qdict = NULL; |
| 2420 | const char *reference = NULL; |
| 2421 | Visitor *v = NULL; |
| 2422 | |
| 2423 | if (ref->type == QTYPE_QSTRING) { |
| 2424 | reference = ref->u.reference; |
| 2425 | } else { |
| 2426 | BlockdevOptions *options = &ref->u.definition; |
| 2427 | assert(ref->type == QTYPE_QDICT); |
| 2428 | |
| 2429 | v = qobject_output_visitor_new(&obj); |
| 2430 | visit_type_BlockdevOptions(v, NULL, &options, &local_err); |
| 2431 | if (local_err) { |
| 2432 | error_propagate(errp, local_err); |
| 2433 | goto fail; |
| 2434 | } |
| 2435 | visit_complete(v, &obj); |
| 2436 | |
Max Reitz | 7dc847e | 2018-02-24 16:40:29 +0100 | [diff] [blame] | 2437 | qdict = qobject_to(QDict, obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2438 | qdict_flatten(qdict); |
| 2439 | |
| 2440 | /* bdrv_open_inherit() defaults to the values in bdrv_flags (for |
| 2441 | * compatibility with other callers) rather than what we want as the |
| 2442 | * real defaults. Apply the defaults here instead. */ |
| 2443 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_DIRECT, "off"); |
| 2444 | qdict_set_default_str(qdict, BDRV_OPT_CACHE_NO_FLUSH, "off"); |
| 2445 | qdict_set_default_str(qdict, BDRV_OPT_READ_ONLY, "off"); |
| 2446 | } |
| 2447 | |
| 2448 | bs = bdrv_open_inherit(NULL, reference, qdict, 0, NULL, NULL, errp); |
| 2449 | obj = NULL; |
| 2450 | |
| 2451 | fail: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2452 | qobject_unref(obj); |
Kevin Wolf | e1d74bc | 2018-01-10 15:52:33 +0100 | [diff] [blame] | 2453 | visit_free(v); |
| 2454 | return bs; |
| 2455 | } |
| 2456 | |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2457 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
| 2458 | int flags, |
| 2459 | QDict *snapshot_options, |
| 2460 | Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2461 | { |
| 2462 | /* 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] | 2463 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2464 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 2465 | QemuOpts *opts = NULL; |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2466 | BlockDriverState *bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2467 | Error *local_err = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2468 | int ret; |
| 2469 | |
| 2470 | /* if snapshot, we create a temporary backing file and open it |
| 2471 | instead of opening 'filename' directly */ |
| 2472 | |
| 2473 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 2474 | total_size = bdrv_getlength(bs); |
| 2475 | if (total_size < 0) { |
| 2476 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2477 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 2478 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2479 | |
| 2480 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2481 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2482 | if (ret < 0) { |
| 2483 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2484 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2485 | } |
| 2486 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 2487 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 2488 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 2489 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2490 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 2491 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2492 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 2493 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 2494 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2495 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2496 | } |
| 2497 | |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2498 | /* Prepare options QDict for the temporary file */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2499 | qdict_put_str(snapshot_options, "file.driver", "file"); |
| 2500 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); |
| 2501 | qdict_put_str(snapshot_options, "driver", "qcow2"); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2502 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2503 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2504 | snapshot_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2505 | if (!bs_snapshot) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2506 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2507 | } |
| 2508 | |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2509 | /* bdrv_append() consumes a strong reference to bs_snapshot |
| 2510 | * (i.e. it will call bdrv_unref() on it) even on error, so in |
| 2511 | * order to be able to return one, we have to increase |
| 2512 | * bs_snapshot's refcount here */ |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2513 | bdrv_ref(bs_snapshot); |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2514 | bdrv_append(bs_snapshot, bs, &local_err); |
| 2515 | if (local_err) { |
| 2516 | error_propagate(errp, local_err); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2517 | bs_snapshot = NULL; |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 2518 | goto out; |
| 2519 | } |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2520 | |
| 2521 | out: |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2522 | qobject_unref(snapshot_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 2523 | g_free(tmp_filename); |
Eric Blake | ff6ed71 | 2017-04-27 16:58:18 -0500 | [diff] [blame] | 2524 | return bs_snapshot; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 2525 | } |
| 2526 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 2527 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2528 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2529 | * |
| 2530 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 2531 | * empty set of options. The reference to the QDict belongs to the block layer |
| 2532 | * 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] | 2533 | * dictionary, it needs to use qobject_ref() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2534 | * |
| 2535 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 2536 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2537 | * |
| 2538 | * The reference parameter may be used to specify an existing block device which |
| 2539 | * should be opened. If specified, neither options nor a filename may be given, |
| 2540 | * 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] | 2541 | */ |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2542 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
| 2543 | const char *reference, |
| 2544 | QDict *options, int flags, |
| 2545 | BlockDriverState *parent, |
| 2546 | const BdrvChildRole *child_role, |
| 2547 | Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2548 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2549 | int ret; |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2550 | BlockBackend *file = NULL; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 2551 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 2552 | BlockDriver *drv = NULL; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 2553 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2554 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 2555 | Error *local_err = NULL; |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2556 | QDict *snapshot_options = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 2557 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 2558 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2559 | assert(!child_role || !flags); |
| 2560 | assert(!child_role == !parent); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2561 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2562 | if (reference) { |
| 2563 | bool options_non_empty = options ? qdict_size(options) : false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2564 | qobject_unref(options); |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2565 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2566 | if (filename || options_non_empty) { |
| 2567 | error_setg(errp, "Cannot reference an existing block device with " |
| 2568 | "additional options or a new filename"); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2569 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2570 | } |
| 2571 | |
| 2572 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 2573 | if (!bs) { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2574 | return NULL; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2575 | } |
Kevin Wolf | 76b2232 | 2016-04-04 17:11:13 +0200 | [diff] [blame] | 2576 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2577 | bdrv_ref(bs); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2578 | return bs; |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 2579 | } |
| 2580 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2581 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 2582 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2583 | /* NULL means an empty set of options */ |
| 2584 | if (options == NULL) { |
| 2585 | options = qdict_new(); |
| 2586 | } |
| 2587 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2588 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2589 | parse_json_protocol(options, &filename, &local_err); |
| 2590 | if (local_err) { |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2591 | goto fail; |
| 2592 | } |
| 2593 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2594 | bs->explicit_options = qdict_clone_shallow(options); |
| 2595 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2596 | if (child_role) { |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 2597 | bs->inherits_from = parent; |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 2598 | child_role->inherit_options(&flags, options, |
| 2599 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2600 | } |
| 2601 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 2602 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 2603 | if (local_err) { |
| 2604 | goto fail; |
| 2605 | } |
| 2606 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2607 | /* |
| 2608 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. |
| 2609 | * Caution: getting a boolean member of @options requires care. |
| 2610 | * When @options come from -blockdev or blockdev_add, members are |
| 2611 | * typed according to the QAPI schema, but when they come from |
| 2612 | * -drive, they're all QString. |
| 2613 | */ |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 2614 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
| 2615 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { |
| 2616 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); |
| 2617 | } else { |
| 2618 | flags &= ~BDRV_O_RDWR; |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 2619 | } |
| 2620 | |
| 2621 | if (flags & BDRV_O_SNAPSHOT) { |
| 2622 | snapshot_options = qdict_new(); |
| 2623 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, |
| 2624 | flags, options); |
Alberto Garcia | f87a0e2 | 2016-09-15 17:53:02 +0300 | [diff] [blame] | 2625 | /* Let bdrv_backing_options() override "read-only" */ |
| 2626 | qdict_del(options, BDRV_OPT_READ_ONLY); |
Alberto Garcia | 14499ea | 2016-09-15 17:53:00 +0300 | [diff] [blame] | 2627 | bdrv_backing_options(&flags, options, flags, options); |
| 2628 | } |
| 2629 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 2630 | bs->open_flags = flags; |
| 2631 | bs->options = options; |
| 2632 | options = qdict_clone_shallow(options); |
| 2633 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2634 | /* Find the right image format driver */ |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2635 | /* See cautionary note on accessing @options above */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2636 | drvname = qdict_get_try_str(options, "driver"); |
| 2637 | if (drvname) { |
| 2638 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2639 | if (!drv) { |
| 2640 | error_setg(errp, "Unknown driver: '%s'", drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2641 | goto fail; |
| 2642 | } |
| 2643 | } |
| 2644 | |
| 2645 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2646 | |
Markus Armbruster | 129c7d1 | 2017-03-30 19:43:12 +0200 | [diff] [blame] | 2647 | /* See cautionary note on accessing @options above */ |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2648 | backing = qdict_get_try_str(options, "backing"); |
Max Reitz | e59a0cf | 2018-02-24 16:40:32 +0100 | [diff] [blame] | 2649 | if (qobject_to(QNull, qdict_get(options, "backing")) != NULL || |
| 2650 | (backing && *backing == '\0')) |
| 2651 | { |
Max Reitz | 4f7be28 | 2018-02-24 16:40:33 +0100 | [diff] [blame] | 2652 | if (backing) { |
| 2653 | warn_report("Use of \"backing\": \"\" is deprecated; " |
| 2654 | "use \"backing\": null instead"); |
| 2655 | } |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 2656 | flags |= BDRV_O_NO_BACKING; |
| 2657 | qdict_del(options, "backing"); |
| 2658 | } |
| 2659 | |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2660 | /* Open image file without format layer. This BlockBackend is only used for |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2661 | * probing, the block drivers will do their own bdrv_open_child() for the |
| 2662 | * 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] | 2663 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2664 | BlockDriverState *file_bs; |
| 2665 | |
| 2666 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, |
| 2667 | &child_file, true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 2668 | if (local_err) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 2669 | goto fail; |
| 2670 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2671 | if (file_bs != NULL) { |
Kevin Wolf | dacaa16 | 2017-11-20 14:59:13 +0100 | [diff] [blame] | 2672 | /* Not requesting BLK_PERM_CONSISTENT_READ because we're only |
| 2673 | * looking at the header to guess the image format. This works even |
| 2674 | * in cases where a guest would not see a consistent state. */ |
| 2675 | file = blk_new(0, BLK_PERM_ALL); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 2676 | blk_insert_bs(file, file_bs, &local_err); |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2677 | bdrv_unref(file_bs); |
Kevin Wolf | d708642 | 2017-01-13 19:02:32 +0100 | [diff] [blame] | 2678 | if (local_err) { |
| 2679 | goto fail; |
| 2680 | } |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2681 | |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2682 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2683 | } |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 2684 | } |
| 2685 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2686 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 2687 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2688 | if (!drv && file) { |
Kevin Wolf | cf2ab8f | 2016-06-20 18:24:02 +0200 | [diff] [blame] | 2689 | ret = find_image_format(file, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2690 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2691 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 2692 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 2693 | /* |
| 2694 | * This option update would logically belong in bdrv_fill_options(), |
| 2695 | * but we first need to open bs->file for the probing to work, while |
| 2696 | * opening bs->file already requires the (mostly) final set of options |
| 2697 | * so that cache mode etc. can be inherited. |
| 2698 | * |
| 2699 | * Adding the driver later is somewhat ugly, but it's not an option |
| 2700 | * that would ever be inherited, so it's correct. We just need to make |
| 2701 | * sure to update both bs->options (which has the full effective |
| 2702 | * options for bs) and options (which has file.* already removed). |
| 2703 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 2704 | qdict_put_str(bs->options, "driver", drv->format_name); |
| 2705 | qdict_put_str(options, "driver", drv->format_name); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 2706 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 2707 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2708 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 2709 | } |
| 2710 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 2711 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 2712 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 2713 | /* file must be NULL if a protocol BDS is about to be created |
| 2714 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 2715 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 2716 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2717 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 2718 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2719 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2720 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 2721 | } |
| 2722 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 2723 | if (file) { |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2724 | blk_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 2725 | file = NULL; |
| 2726 | } |
| 2727 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2728 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 2729 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 2730 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2731 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2732 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2733 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2734 | } |
| 2735 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 2736 | bdrv_refresh_filename(bs); |
| 2737 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2738 | /* Check if any unknown options were used */ |
Paolo Bonzini | 7ad2757 | 2017-01-04 15:59:14 +0100 | [diff] [blame] | 2739 | if (qdict_size(options) != 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2740 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 2741 | if (flags & BDRV_O_PROTOCOL) { |
| 2742 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 2743 | "'%s'", drv->format_name, entry->key); |
| 2744 | } else { |
Max Reitz | d0e46a5 | 2016-03-16 19:54:34 +0100 | [diff] [blame] | 2745 | error_setg(errp, |
| 2746 | "Block format '%s' does not support the option '%s'", |
| 2747 | drv->format_name, entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 2748 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2749 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2750 | goto close_and_fail; |
| 2751 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2752 | |
Daniel P. Berrange | c01c214 | 2017-06-23 17:24:16 +0100 | [diff] [blame] | 2753 | bdrv_parent_cb_change_media(bs, true); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2754 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2755 | qobject_unref(options); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2756 | |
| 2757 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 2758 | * temporary snapshot afterwards. */ |
| 2759 | if (snapshot_flags) { |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2760 | BlockDriverState *snapshot_bs; |
| 2761 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, |
| 2762 | snapshot_options, &local_err); |
Kevin Wolf | 73176be | 2016-03-07 13:02:15 +0100 | [diff] [blame] | 2763 | snapshot_options = NULL; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2764 | if (local_err) { |
| 2765 | goto close_and_fail; |
| 2766 | } |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2767 | /* We are not going to return bs but the overlay on top of it |
| 2768 | * (snapshot_bs); thus, we have to drop the strong reference to bs |
| 2769 | * (which we obtained by calling bdrv_new()). bs will not be deleted, |
| 2770 | * though, because the overlay still has a reference to it. */ |
| 2771 | bdrv_unref(bs); |
| 2772 | bs = snapshot_bs; |
Max Reitz | 6683618 | 2016-05-17 16:41:27 +0200 | [diff] [blame] | 2773 | } |
| 2774 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2775 | return bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2776 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 2777 | fail: |
Kevin Wolf | 5696c6e | 2017-02-17 18:39:24 +0100 | [diff] [blame] | 2778 | blk_unref(file); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2779 | qobject_unref(snapshot_options); |
| 2780 | qobject_unref(bs->explicit_options); |
| 2781 | qobject_unref(bs->options); |
| 2782 | qobject_unref(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2783 | bs->options = NULL; |
Manos Pitsidianakis | 998cbd6 | 2017-07-14 17:35:47 +0300 | [diff] [blame] | 2784 | bs->explicit_options = NULL; |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2785 | bdrv_unref(bs); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 2786 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2787 | return NULL; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2788 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 2789 | close_and_fail: |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2790 | bdrv_unref(bs); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2791 | qobject_unref(snapshot_options); |
| 2792 | qobject_unref(options); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 2793 | error_propagate(errp, local_err); |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2794 | return NULL; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 2795 | } |
| 2796 | |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2797 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
| 2798 | QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2799 | { |
Max Reitz | 5b36393 | 2016-05-17 16:41:31 +0200 | [diff] [blame] | 2800 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 2801 | NULL, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 2802 | } |
| 2803 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2804 | /* |
| 2805 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 2806 | * reopen of multiple devices. |
| 2807 | * |
| 2808 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 2809 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 2810 | * be created and initialized. This newly created BlockReopenQueue should be |
| 2811 | * passed back in for subsequent calls that are intended to be of the same |
| 2812 | * atomic 'set'. |
| 2813 | * |
| 2814 | * bs is the BlockDriverState to add to the reopen queue. |
| 2815 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 2816 | * options contains the changed options for the associated bs |
| 2817 | * (the BlockReopenQueue takes ownership) |
| 2818 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2819 | * flags contains the open flags for the associated bs |
| 2820 | * |
| 2821 | * returns a pointer to bs_queue, which is either the newly allocated |
| 2822 | * bs_queue, or the existing bs_queue being used. |
| 2823 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 2824 | * bs must be drained between bdrv_reopen_queue() and bdrv_reopen_multiple(). |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2825 | */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2826 | static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, |
| 2827 | BlockDriverState *bs, |
| 2828 | QDict *options, |
| 2829 | int flags, |
| 2830 | const BdrvChildRole *role, |
| 2831 | QDict *parent_options, |
| 2832 | int parent_flags) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2833 | { |
| 2834 | assert(bs != NULL); |
| 2835 | |
| 2836 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 2837 | BdrvChild *child; |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2838 | QDict *old_options, *explicit_options; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 2839 | |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 2840 | /* Make sure that the caller remembered to use a drained section. This is |
| 2841 | * important to avoid graph changes between the recursive queuing here and |
| 2842 | * bdrv_reopen_multiple(). */ |
| 2843 | assert(bs->quiesce_counter > 0); |
| 2844 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2845 | if (bs_queue == NULL) { |
| 2846 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 2847 | QSIMPLEQ_INIT(bs_queue); |
| 2848 | } |
| 2849 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 2850 | if (!options) { |
| 2851 | options = qdict_new(); |
| 2852 | } |
| 2853 | |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 2854 | /* Check if this BlockDriverState is already in the queue */ |
| 2855 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 2856 | if (bs == bs_entry->state.bs) { |
| 2857 | break; |
| 2858 | } |
| 2859 | } |
| 2860 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2861 | /* |
| 2862 | * Precedence of options: |
| 2863 | * 1. Explicitly passed in options (highest) |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2864 | * 2. Set in flags (only for top level) |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2865 | * 3. Retained from explicitly set options of bs |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 2866 | * 4. Inherited from parent node |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2867 | * 5. Retained from effective options of bs |
| 2868 | */ |
| 2869 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2870 | if (!parent_options) { |
| 2871 | /* |
| 2872 | * Any setting represented by flags is always updated. If the |
| 2873 | * corresponding QDict option is set, it takes precedence. Otherwise |
| 2874 | * the flag is translated into a QDict option. The old setting of bs is |
| 2875 | * not considered. |
| 2876 | */ |
| 2877 | update_options_from_flags(options, flags); |
| 2878 | } |
| 2879 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2880 | /* Old explicitly set values (don't overwrite by inherited value) */ |
Alberto Garcia | 5b7ba05 | 2016-09-15 17:53:03 +0300 | [diff] [blame] | 2881 | if (bs_entry) { |
| 2882 | old_options = qdict_clone_shallow(bs_entry->state.explicit_options); |
| 2883 | } else { |
| 2884 | old_options = qdict_clone_shallow(bs->explicit_options); |
| 2885 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2886 | bdrv_join_options(bs, options, old_options); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2887 | qobject_unref(old_options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2888 | |
| 2889 | explicit_options = qdict_clone_shallow(options); |
| 2890 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2891 | /* Inherit from parent node */ |
| 2892 | if (parent_options) { |
Fam Zheng | 1a52973 | 2018-03-13 22:20:02 +0800 | [diff] [blame] | 2893 | QemuOpts *opts; |
| 2894 | QDict *options_copy; |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2895 | assert(!flags); |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 2896 | role->inherit_options(&flags, options, parent_flags, parent_options); |
Fam Zheng | 1a52973 | 2018-03-13 22:20:02 +0800 | [diff] [blame] | 2897 | options_copy = qdict_clone_shallow(options); |
| 2898 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 2899 | qemu_opts_absorb_qdict(opts, options_copy, NULL); |
| 2900 | update_flags_from_options(&flags, opts); |
| 2901 | qemu_opts_del(opts); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2902 | qobject_unref(options_copy); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2903 | } |
| 2904 | |
| 2905 | /* Old values are used for options that aren't set yet */ |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 2906 | old_options = qdict_clone_shallow(bs->options); |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 2907 | bdrv_join_options(bs, options, old_options); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2908 | qobject_unref(old_options); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 2909 | |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 2910 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 2911 | flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | fd45202 | 2017-08-03 17:02:59 +0200 | [diff] [blame] | 2912 | if (flags & BDRV_O_RDWR) { |
| 2913 | flags |= BDRV_O_ALLOW_RDWR; |
| 2914 | } |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 2915 | |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 2916 | if (!bs_entry) { |
| 2917 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 2918 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 2919 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 2920 | qobject_unref(bs_entry->state.options); |
| 2921 | qobject_unref(bs_entry->state.explicit_options); |
Kevin Wolf | 1857c97 | 2017-09-14 14:53:46 +0200 | [diff] [blame] | 2922 | } |
| 2923 | |
| 2924 | bs_entry->state.bs = bs; |
| 2925 | bs_entry->state.options = options; |
| 2926 | bs_entry->state.explicit_options = explicit_options; |
| 2927 | bs_entry->state.flags = flags; |
| 2928 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 2929 | /* This needs to be overwritten in bdrv_reopen_prepare() */ |
| 2930 | bs_entry->state.perm = UINT64_MAX; |
| 2931 | bs_entry->state.shared_perm = 0; |
| 2932 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 2933 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 2934 | QDict *new_child_options; |
| 2935 | char *child_key_dot; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 2936 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 2937 | /* reopen can only change the options of block devices that were |
| 2938 | * implicitly created and inherited options. For other (referenced) |
| 2939 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 2940 | if (child->bs->inherits_from != bs) { |
| 2941 | continue; |
| 2942 | } |
| 2943 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 2944 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 2945 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 2946 | g_free(child_key_dot); |
| 2947 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2948 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, 0, |
| 2949 | child->role, options, flags); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2950 | } |
| 2951 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2952 | return bs_queue; |
| 2953 | } |
| 2954 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 2955 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 2956 | BlockDriverState *bs, |
| 2957 | QDict *options, int flags) |
| 2958 | { |
| 2959 | return bdrv_reopen_queue_child(bs_queue, bs, options, flags, |
| 2960 | NULL, NULL, 0); |
| 2961 | } |
| 2962 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2963 | /* |
| 2964 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 2965 | * |
| 2966 | * The queue passed in (bs_queue) must have been built up previous |
| 2967 | * via bdrv_reopen_queue(). |
| 2968 | * |
| 2969 | * Reopens all BDS specified in the queue, with the appropriate |
| 2970 | * flags. All devices are prepared for reopen, and failure of any |
| 2971 | * device will cause all device changes to be abandonded, and intermediate |
| 2972 | * data cleaned up. |
| 2973 | * |
| 2974 | * If all devices prepare successfully, then the changes are committed |
| 2975 | * to all devices. |
| 2976 | * |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 2977 | * All affected nodes must be drained between bdrv_reopen_queue() and |
| 2978 | * bdrv_reopen_multiple(). |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2979 | */ |
Paolo Bonzini | 720150f | 2016-10-27 12:49:02 +0200 | [diff] [blame] | 2980 | int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2981 | { |
| 2982 | int ret = -1; |
| 2983 | BlockReopenQueueEntry *bs_entry, *next; |
| 2984 | Error *local_err = NULL; |
| 2985 | |
| 2986 | assert(bs_queue != NULL); |
| 2987 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2988 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 2989 | assert(bs_entry->state.bs->quiesce_counter > 0); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2990 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { |
| 2991 | error_propagate(errp, local_err); |
| 2992 | goto cleanup; |
| 2993 | } |
| 2994 | bs_entry->prepared = true; |
| 2995 | } |
| 2996 | |
| 2997 | /* If we reach this point, we have success and just need to apply the |
| 2998 | * changes |
| 2999 | */ |
| 3000 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 3001 | bdrv_reopen_commit(&bs_entry->state); |
| 3002 | } |
| 3003 | |
| 3004 | ret = 0; |
| 3005 | |
| 3006 | cleanup: |
| 3007 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 3008 | if (ret && bs_entry->prepared) { |
| 3009 | bdrv_reopen_abort(&bs_entry->state); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3010 | } else if (ret) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3011 | qobject_unref(bs_entry->state.explicit_options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3012 | } |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3013 | qobject_unref(bs_entry->state.options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3014 | g_free(bs_entry); |
| 3015 | } |
| 3016 | g_free(bs_queue); |
Alberto Garcia | 40840e4 | 2016-10-28 10:08:03 +0300 | [diff] [blame] | 3017 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3018 | return ret; |
| 3019 | } |
| 3020 | |
| 3021 | |
| 3022 | /* Reopen a single BlockDriverState with the specified flags. */ |
| 3023 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) |
| 3024 | { |
| 3025 | int ret = -1; |
| 3026 | Error *local_err = NULL; |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3027 | BlockReopenQueue *queue; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3028 | |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3029 | bdrv_subtree_drained_begin(bs); |
| 3030 | |
| 3031 | queue = bdrv_reopen_queue(NULL, bs, NULL, bdrv_flags); |
Paolo Bonzini | 720150f | 2016-10-27 12:49:02 +0200 | [diff] [blame] | 3032 | ret = bdrv_reopen_multiple(bdrv_get_aio_context(bs), queue, &local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3033 | if (local_err != NULL) { |
| 3034 | error_propagate(errp, local_err); |
| 3035 | } |
Kevin Wolf | 1a63a90 | 2017-12-06 20:24:44 +0100 | [diff] [blame] | 3036 | |
| 3037 | bdrv_subtree_drained_end(bs); |
| 3038 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3039 | return ret; |
| 3040 | } |
| 3041 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3042 | static BlockReopenQueueEntry *find_parent_in_reopen_queue(BlockReopenQueue *q, |
| 3043 | BdrvChild *c) |
| 3044 | { |
| 3045 | BlockReopenQueueEntry *entry; |
| 3046 | |
| 3047 | QSIMPLEQ_FOREACH(entry, q, entry) { |
| 3048 | BlockDriverState *bs = entry->state.bs; |
| 3049 | BdrvChild *child; |
| 3050 | |
| 3051 | QLIST_FOREACH(child, &bs->children, next) { |
| 3052 | if (child == c) { |
| 3053 | return entry; |
| 3054 | } |
| 3055 | } |
| 3056 | } |
| 3057 | |
| 3058 | return NULL; |
| 3059 | } |
| 3060 | |
| 3061 | static void bdrv_reopen_perm(BlockReopenQueue *q, BlockDriverState *bs, |
| 3062 | uint64_t *perm, uint64_t *shared) |
| 3063 | { |
| 3064 | BdrvChild *c; |
| 3065 | BlockReopenQueueEntry *parent; |
| 3066 | uint64_t cumulative_perms = 0; |
| 3067 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; |
| 3068 | |
| 3069 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 3070 | parent = find_parent_in_reopen_queue(q, c); |
| 3071 | if (!parent) { |
| 3072 | cumulative_perms |= c->perm; |
| 3073 | cumulative_shared_perms &= c->shared_perm; |
| 3074 | } else { |
| 3075 | uint64_t nperm, nshared; |
| 3076 | |
| 3077 | bdrv_child_perm(parent->state.bs, bs, c, c->role, q, |
| 3078 | parent->state.perm, parent->state.shared_perm, |
| 3079 | &nperm, &nshared); |
| 3080 | |
| 3081 | cumulative_perms |= nperm; |
| 3082 | cumulative_shared_perms &= nshared; |
| 3083 | } |
| 3084 | } |
| 3085 | *perm = cumulative_perms; |
| 3086 | *shared = cumulative_shared_perms; |
| 3087 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3088 | |
| 3089 | /* |
| 3090 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 3091 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 3092 | * the block driver layer .bdrv_reopen_prepare() |
| 3093 | * |
| 3094 | * bs is the BlockDriverState to reopen |
| 3095 | * flags are the new open flags |
| 3096 | * queue is the reopen queue |
| 3097 | * |
| 3098 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 3099 | * as well. |
| 3100 | * |
| 3101 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 3102 | * It is the responsibility of the caller to then call the abort() or |
| 3103 | * commit() for any other BDS that have been left in a prepare() state |
| 3104 | * |
| 3105 | */ |
| 3106 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 3107 | Error **errp) |
| 3108 | { |
| 3109 | int ret = -1; |
| 3110 | Error *local_err = NULL; |
| 3111 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3112 | QemuOpts *opts; |
| 3113 | const char *value; |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 3114 | bool read_only; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3115 | |
| 3116 | assert(reopen_state != NULL); |
| 3117 | assert(reopen_state->bs->drv != NULL); |
| 3118 | drv = reopen_state->bs->drv; |
| 3119 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3120 | /* Process generic block layer options */ |
| 3121 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 3122 | qemu_opts_absorb_qdict(opts, reopen_state->options, &local_err); |
| 3123 | if (local_err) { |
| 3124 | error_propagate(errp, local_err); |
| 3125 | ret = -EINVAL; |
| 3126 | goto error; |
| 3127 | } |
| 3128 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 3129 | update_flags_from_options(&reopen_state->flags, opts); |
| 3130 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3131 | /* node-name and driver must be unchanged. Put them back into the QDict, so |
| 3132 | * that they are checked at the end of this function. */ |
| 3133 | value = qemu_opt_get(opts, "node-name"); |
| 3134 | if (value) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3135 | qdict_put_str(reopen_state->options, "node-name", value); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3136 | } |
| 3137 | |
| 3138 | value = qemu_opt_get(opts, "driver"); |
| 3139 | if (value) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 3140 | qdict_put_str(reopen_state->options, "driver", value); |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3141 | } |
| 3142 | |
Jeff Cody | 3d8ce17 | 2017-04-07 16:55:30 -0400 | [diff] [blame] | 3143 | /* If we are to stay read-only, do not allow permission change |
| 3144 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is |
| 3145 | * not set, or if the BDS still has copy_on_read enabled */ |
| 3146 | read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 54a32bf | 2017-08-03 17:02:58 +0200 | [diff] [blame] | 3147 | 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] | 3148 | if (local_err) { |
| 3149 | error_propagate(errp, local_err); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3150 | goto error; |
| 3151 | } |
| 3152 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3153 | /* Calculate required permissions after reopening */ |
| 3154 | bdrv_reopen_perm(queue, reopen_state->bs, |
| 3155 | &reopen_state->perm, &reopen_state->shared_perm); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3156 | |
| 3157 | ret = bdrv_flush(reopen_state->bs); |
| 3158 | if (ret) { |
Eric Blake | 455b0fd | 2015-11-10 23:51:20 -0700 | [diff] [blame] | 3159 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3160 | goto error; |
| 3161 | } |
| 3162 | |
| 3163 | if (drv->bdrv_reopen_prepare) { |
| 3164 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 3165 | if (ret) { |
| 3166 | if (local_err != NULL) { |
| 3167 | error_propagate(errp, local_err); |
| 3168 | } else { |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 3169 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 3170 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3171 | } |
| 3172 | goto error; |
| 3173 | } |
| 3174 | } else { |
| 3175 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 3176 | * handler for each supported drv. */ |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 3177 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 3178 | "does not support reopening files", drv->format_name, |
| 3179 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3180 | ret = -1; |
| 3181 | goto error; |
| 3182 | } |
| 3183 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3184 | /* Options that are not handled are only okay if they are unchanged |
| 3185 | * compared to the old state. It is expected that some options are only |
| 3186 | * used for the initial open, but not reopen (e.g. filename) */ |
| 3187 | if (qdict_size(reopen_state->options)) { |
| 3188 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 3189 | |
| 3190 | do { |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 3191 | QObject *new = entry->value; |
| 3192 | QObject *old = qdict_get(reopen_state->bs->options, entry->key); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3193 | |
Max Reitz | 54fd1b0 | 2017-11-14 19:01:26 +0100 | [diff] [blame] | 3194 | /* |
| 3195 | * TODO: When using -drive to specify blockdev options, all values |
| 3196 | * will be strings; however, when using -blockdev, blockdev-add or |
| 3197 | * filenames using the json:{} pseudo-protocol, they will be |
| 3198 | * correctly typed. |
| 3199 | * In contrast, reopening options are (currently) always strings |
| 3200 | * (because you can only specify them through qemu-io; all other |
| 3201 | * callers do not specify any options). |
| 3202 | * Therefore, when using anything other than -drive to create a BDS, |
| 3203 | * this cannot detect non-string options as unchanged, because |
| 3204 | * qobject_is_equal() always returns false for objects of different |
| 3205 | * type. In the future, this should be remedied by correctly typing |
| 3206 | * all options. For now, this is not too big of an issue because |
| 3207 | * the user can simply omit options which cannot be changed anyway, |
| 3208 | * so they will stay unchanged. |
| 3209 | */ |
| 3210 | if (!qobject_is_equal(new, old)) { |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 3211 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 3212 | ret = -EINVAL; |
| 3213 | goto error; |
| 3214 | } |
| 3215 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 3216 | } |
| 3217 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3218 | ret = bdrv_check_perm(reopen_state->bs, queue, reopen_state->perm, |
| 3219 | reopen_state->shared_perm, NULL, errp); |
| 3220 | if (ret < 0) { |
| 3221 | goto error; |
| 3222 | } |
| 3223 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3224 | ret = 0; |
| 3225 | |
| 3226 | error: |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 3227 | qemu_opts_del(opts); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3228 | return ret; |
| 3229 | } |
| 3230 | |
| 3231 | /* |
| 3232 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 3233 | * makes them final by swapping the staging BlockDriverState contents into |
| 3234 | * the active BlockDriverState contents. |
| 3235 | */ |
| 3236 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 3237 | { |
| 3238 | BlockDriver *drv; |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3239 | BlockDriverState *bs; |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3240 | bool old_can_write, new_can_write; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3241 | |
| 3242 | assert(reopen_state != NULL); |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3243 | bs = reopen_state->bs; |
| 3244 | drv = bs->drv; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3245 | assert(drv != NULL); |
| 3246 | |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3247 | old_can_write = |
| 3248 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); |
| 3249 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3250 | /* If there are any driver level actions to take */ |
| 3251 | if (drv->bdrv_reopen_commit) { |
| 3252 | drv->bdrv_reopen_commit(reopen_state); |
| 3253 | } |
| 3254 | |
| 3255 | /* set BDS specific flags now */ |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3256 | qobject_unref(bs->explicit_options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3257 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3258 | bs->explicit_options = reopen_state->explicit_options; |
| 3259 | bs->open_flags = reopen_state->flags; |
| 3260 | bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 3261 | |
Vladimir Sementsov-Ogievskiy | 50bf65b | 2017-06-28 15:05:12 +0300 | [diff] [blame] | 3262 | bdrv_refresh_limits(bs, NULL); |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3263 | |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3264 | bdrv_set_perm(reopen_state->bs, reopen_state->perm, |
| 3265 | reopen_state->shared_perm); |
| 3266 | |
Vladimir Sementsov-Ogievskiy | cb9ff6c | 2017-06-28 15:05:13 +0300 | [diff] [blame] | 3267 | new_can_write = |
| 3268 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); |
| 3269 | if (!old_can_write && new_can_write && drv->bdrv_reopen_bitmaps_rw) { |
| 3270 | Error *local_err = NULL; |
| 3271 | if (drv->bdrv_reopen_bitmaps_rw(bs, &local_err) < 0) { |
| 3272 | /* This is not fatal, bitmaps just left read-only, so all following |
| 3273 | * writes will fail. User can remove read-only bitmaps to unblock |
| 3274 | * writes. |
| 3275 | */ |
| 3276 | error_reportf_err(local_err, |
| 3277 | "%s: Failed to make dirty bitmaps writable: ", |
| 3278 | bdrv_get_node_name(bs)); |
| 3279 | } |
| 3280 | } |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3281 | } |
| 3282 | |
| 3283 | /* |
| 3284 | * Abort the reopen, and delete and free the staged changes in |
| 3285 | * reopen_state |
| 3286 | */ |
| 3287 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 3288 | { |
| 3289 | BlockDriver *drv; |
| 3290 | |
| 3291 | assert(reopen_state != NULL); |
| 3292 | drv = reopen_state->bs->drv; |
| 3293 | assert(drv != NULL); |
| 3294 | |
| 3295 | if (drv->bdrv_reopen_abort) { |
| 3296 | drv->bdrv_reopen_abort(reopen_state); |
| 3297 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 3298 | |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3299 | qobject_unref(reopen_state->explicit_options); |
Kevin Wolf | 3045025 | 2017-07-03 17:07:35 +0200 | [diff] [blame] | 3300 | |
| 3301 | bdrv_abort_perm_update(reopen_state->bs); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 3302 | } |
| 3303 | |
| 3304 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 3305 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3306 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3307 | BdrvAioNotifier *ban, *ban_next; |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3308 | BdrvChild *child, *next; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3309 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3310 | assert(!bs->job); |
Max Reitz | 30f55fb | 2016-05-17 16:41:32 +0200 | [diff] [blame] | 3311 | assert(!bs->refcnt); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 3312 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3313 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 3314 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 3315 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3316 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 3317 | if (bs->drv) { |
Kevin Wolf | 9a7dedb | 2015-06-16 10:58:20 +0200 | [diff] [blame] | 3318 | bs->drv->bdrv_close(bs); |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3319 | bs->drv = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3320 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 3321 | |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3322 | bdrv_set_backing_hd(bs, NULL, &error_abort); |
| 3323 | |
| 3324 | if (bs->file != NULL) { |
| 3325 | bdrv_unref_child(bs, bs->file); |
| 3326 | bs->file = NULL; |
| 3327 | } |
| 3328 | |
| 3329 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
| 3330 | /* TODO Remove bdrv_unref() from drivers' close function and use |
| 3331 | * bdrv_unref_child() here */ |
| 3332 | if (child->bs->inherits_from == bs) { |
| 3333 | child->bs->inherits_from = NULL; |
| 3334 | } |
| 3335 | bdrv_detach_child(child); |
| 3336 | } |
| 3337 | |
| 3338 | g_free(bs->opaque); |
| 3339 | bs->opaque = NULL; |
| 3340 | atomic_set(&bs->copy_on_read, 0); |
| 3341 | bs->backing_file[0] = '\0'; |
| 3342 | bs->backing_format[0] = '\0'; |
| 3343 | bs->total_sectors = 0; |
| 3344 | bs->encrypted = false; |
| 3345 | bs->sg = false; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3346 | qobject_unref(bs->options); |
| 3347 | qobject_unref(bs->explicit_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3348 | bs->options = NULL; |
| 3349 | bs->explicit_options = NULL; |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 3350 | qobject_unref(bs->full_open_options); |
Alberto Garcia | 50a3efb | 2017-11-06 16:53:45 +0200 | [diff] [blame] | 3351 | bs->full_open_options = NULL; |
| 3352 | |
Vladimir Sementsov-Ogievskiy | cca43ae | 2017-06-28 15:05:16 +0300 | [diff] [blame] | 3353 | bdrv_release_named_dirty_bitmaps(bs); |
| 3354 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 3355 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3356 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 3357 | g_free(ban); |
| 3358 | } |
| 3359 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 3360 | bdrv_drained_end(bs); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3361 | } |
| 3362 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3363 | void bdrv_close_all(void) |
| 3364 | { |
Kevin Wolf | b3b5299 | 2018-05-16 13:46:37 +0200 | [diff] [blame] | 3365 | assert(job_next(NULL) == NULL); |
Kevin Wolf | cd7fca9 | 2016-07-06 11:22:39 +0200 | [diff] [blame] | 3366 | nbd_export_close_all(); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3367 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3368 | /* Drop references from requests still in flight, such as canceled block |
| 3369 | * jobs whose AIO context has not been polled yet */ |
| 3370 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3371 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 3372 | blk_remove_all_bs(); |
| 3373 | blockdev_close_all_bdrv_states(); |
| 3374 | |
Kevin Wolf | a1a2af0 | 2016-04-08 18:26:37 +0200 | [diff] [blame] | 3375 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 3376 | } |
| 3377 | |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3378 | static bool should_update_child(BdrvChild *c, BlockDriverState *to) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3379 | { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3380 | BdrvChild *to_c; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3381 | |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3382 | if (c->role->stay_at_node) { |
| 3383 | return false; |
| 3384 | } |
| 3385 | |
| 3386 | if (c->role == &child_backing) { |
| 3387 | /* If @from is a backing file of @to, ignore the child to avoid |
| 3388 | * creating a loop. We only want to change the pointer of other |
| 3389 | * parents. */ |
| 3390 | QLIST_FOREACH(to_c, &to->children, next) { |
| 3391 | if (to_c == c) { |
| 3392 | break; |
| 3393 | } |
| 3394 | } |
| 3395 | if (to_c) { |
| 3396 | return false; |
| 3397 | } |
| 3398 | } |
| 3399 | |
| 3400 | return true; |
| 3401 | } |
| 3402 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 3403 | void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
| 3404 | Error **errp) |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3405 | { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3406 | BdrvChild *c, *next; |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3407 | GSList *list = NULL, *p; |
| 3408 | uint64_t old_perm, old_shared; |
| 3409 | uint64_t perm = 0, shared = BLK_PERM_ALL; |
| 3410 | int ret; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3411 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 3412 | assert(!atomic_read(&from->in_flight)); |
| 3413 | assert(!atomic_read(&to->in_flight)); |
| 3414 | |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3415 | /* Make sure that @from doesn't go away until we have successfully attached |
| 3416 | * all of its parents to @to. */ |
| 3417 | bdrv_ref(from); |
| 3418 | |
| 3419 | /* Put all parents into @list and calculate their cumulative permissions */ |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3420 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
Kevin Wolf | d0ac038 | 2017-03-01 17:30:41 +0100 | [diff] [blame] | 3421 | if (!should_update_child(c, to)) { |
Kevin Wolf | 26de943 | 2017-01-17 13:39:34 +0100 | [diff] [blame] | 3422 | continue; |
| 3423 | } |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3424 | list = g_slist_prepend(list, c); |
| 3425 | perm |= c->perm; |
| 3426 | shared &= c->shared_perm; |
| 3427 | } |
| 3428 | |
| 3429 | /* Check whether the required permissions can be granted on @to, ignoring |
| 3430 | * all BdrvChild in @list so that they can't block themselves. */ |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 3431 | ret = bdrv_check_update_perm(to, NULL, perm, shared, list, errp); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3432 | if (ret < 0) { |
| 3433 | bdrv_abort_perm_update(to); |
| 3434 | goto out; |
| 3435 | } |
| 3436 | |
| 3437 | /* Now actually perform the change. We performed the permission check for |
| 3438 | * all elements of @list at once, so set the permissions all at once at the |
| 3439 | * very end. */ |
| 3440 | for (p = list; p != NULL; p = p->next) { |
| 3441 | c = p->data; |
Max Reitz | 9bd910e | 2016-06-10 20:57:46 +0200 | [diff] [blame] | 3442 | |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3443 | bdrv_ref(to); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3444 | bdrv_replace_child_noperm(c, to); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3445 | bdrv_unref(from); |
| 3446 | } |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3447 | |
| 3448 | bdrv_get_cumulative_perm(to, &old_perm, &old_shared); |
| 3449 | bdrv_set_perm(to, old_perm | perm, old_shared | shared); |
| 3450 | |
| 3451 | out: |
| 3452 | g_slist_free(list); |
| 3453 | bdrv_unref(from); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3454 | } |
| 3455 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3456 | /* |
| 3457 | * Add new bs contents at the top of an image chain while the chain is |
| 3458 | * live, while keeping required fields on the top layer. |
| 3459 | * |
| 3460 | * This will modify the BlockDriverState fields, and swap contents |
| 3461 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 3462 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3463 | * bs_new must not be attached to a BlockBackend. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 3464 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3465 | * This function does not create any image files. |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3466 | * |
| 3467 | * bdrv_append() takes ownership of a bs_new reference and unrefs it because |
| 3468 | * that's what the callers commonly need. bs_new will be referenced by the old |
| 3469 | * parents of bs_top after bdrv_append() returns. If the caller needs to keep a |
| 3470 | * reference of its own, it must call bdrv_ref(). |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3471 | */ |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3472 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
| 3473 | Error **errp) |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3474 | { |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3475 | Error *local_err = NULL; |
| 3476 | |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3477 | bdrv_set_backing_hd(bs_new, bs_top, &local_err); |
| 3478 | if (local_err) { |
| 3479 | error_propagate(errp, local_err); |
| 3480 | goto out; |
| 3481 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3482 | |
Kevin Wolf | 5fe31c2 | 2017-03-06 16:20:51 +0100 | [diff] [blame] | 3483 | bdrv_replace_node(bs_top, bs_new, &local_err); |
Kevin Wolf | 234ac1a | 2017-03-02 18:43:00 +0100 | [diff] [blame] | 3484 | if (local_err) { |
| 3485 | error_propagate(errp, local_err); |
| 3486 | bdrv_set_backing_hd(bs_new, NULL, &error_abort); |
| 3487 | goto out; |
| 3488 | } |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3489 | |
| 3490 | /* bs_new is now referenced by its new parents, we don't need the |
| 3491 | * additional reference any more. */ |
Kevin Wolf | b2c2832 | 2017-02-20 12:46:42 +0100 | [diff] [blame] | 3492 | out: |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 3493 | bdrv_unref(bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 3494 | } |
| 3495 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 3496 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3497 | { |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 3498 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 3499 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 3500 | assert(!bs->refcnt); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 3501 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 3502 | bdrv_close(bs); |
| 3503 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 3504 | /* remove from list, if necessary */ |
Kevin Wolf | 63eaaae | 2016-03-18 10:46:57 +0100 | [diff] [blame] | 3505 | if (bs->node_name[0] != '\0') { |
| 3506 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 3507 | } |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 3508 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 3509 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 3510 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3511 | } |
| 3512 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 3513 | /* |
| 3514 | * Run consistency checks on an image |
| 3515 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 3516 | * 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] | 3517 | * 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] | 3518 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 3519 | */ |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 3520 | static int coroutine_fn bdrv_co_check(BlockDriverState *bs, |
| 3521 | BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 3522 | { |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 3523 | if (bs->drv == NULL) { |
| 3524 | return -ENOMEDIUM; |
| 3525 | } |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 3526 | if (bs->drv->bdrv_co_check == NULL) { |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 3527 | return -ENOTSUP; |
| 3528 | } |
| 3529 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 3530 | memset(res, 0, sizeof(*res)); |
Paolo Bonzini | 2fd6163 | 2018-03-01 17:36:19 +0100 | [diff] [blame] | 3531 | return bs->drv->bdrv_co_check(bs, res, fix); |
| 3532 | } |
| 3533 | |
| 3534 | typedef struct CheckCo { |
| 3535 | BlockDriverState *bs; |
| 3536 | BdrvCheckResult *res; |
| 3537 | BdrvCheckMode fix; |
| 3538 | int ret; |
| 3539 | } CheckCo; |
| 3540 | |
| 3541 | static void bdrv_check_co_entry(void *opaque) |
| 3542 | { |
| 3543 | CheckCo *cco = opaque; |
| 3544 | cco->ret = bdrv_co_check(cco->bs, cco->res, cco->fix); |
| 3545 | } |
| 3546 | |
| 3547 | int bdrv_check(BlockDriverState *bs, |
| 3548 | BdrvCheckResult *res, BdrvCheckMode fix) |
| 3549 | { |
| 3550 | Coroutine *co; |
| 3551 | CheckCo cco = { |
| 3552 | .bs = bs, |
| 3553 | .res = res, |
| 3554 | .ret = -EINPROGRESS, |
| 3555 | .fix = fix, |
| 3556 | }; |
| 3557 | |
| 3558 | if (qemu_in_coroutine()) { |
| 3559 | /* Fast-path if already in coroutine context */ |
| 3560 | bdrv_check_co_entry(&cco); |
| 3561 | } else { |
| 3562 | co = qemu_coroutine_create(bdrv_check_co_entry, &cco); |
| 3563 | qemu_coroutine_enter(co); |
| 3564 | BDRV_POLL_WHILE(bs, cco.ret == -EINPROGRESS); |
| 3565 | } |
| 3566 | |
| 3567 | return cco.ret; |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 3568 | } |
| 3569 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3570 | /* |
| 3571 | * Return values: |
| 3572 | * 0 - success |
| 3573 | * -EINVAL - backing format specified, but no file |
| 3574 | * -ENOSPC - can't update the backing file because no space is left in the |
| 3575 | * image file header |
| 3576 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 3577 | */ |
| 3578 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 3579 | const char *backing_file, const char *backing_fmt) |
| 3580 | { |
| 3581 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 3582 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3583 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 3584 | if (!drv) { |
| 3585 | return -ENOMEDIUM; |
| 3586 | } |
| 3587 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 3588 | /* Backing file format doesn't make sense without a backing file */ |
| 3589 | if (backing_fmt && !backing_file) { |
| 3590 | return -EINVAL; |
| 3591 | } |
| 3592 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3593 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 3594 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3595 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 3596 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3597 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 3598 | |
| 3599 | if (ret == 0) { |
| 3600 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 3601 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 3602 | } |
| 3603 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 3604 | } |
| 3605 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3606 | /* |
| 3607 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 3608 | * |
| 3609 | * active is the current topmost image. |
| 3610 | * |
| 3611 | * Returns NULL if bs is not found in active's image chain, |
| 3612 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 3613 | * |
| 3614 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3615 | */ |
| 3616 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 3617 | BlockDriverState *bs) |
| 3618 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3619 | while (active && bs != backing_bs(active)) { |
| 3620 | active = backing_bs(active); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3621 | } |
| 3622 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 3623 | return active; |
| 3624 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3625 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 3626 | /* Given a BDS, searches for the base layer. */ |
| 3627 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 3628 | { |
| 3629 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3630 | } |
| 3631 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3632 | /* |
| 3633 | * Drops images above 'base' up to and including 'top', and sets the image |
| 3634 | * above 'top' to have base as its backing file. |
| 3635 | * |
| 3636 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 3637 | * information in 'bs' can be properly updated. |
| 3638 | * |
| 3639 | * E.g., this will convert the following chain: |
| 3640 | * bottom <- base <- intermediate <- top <- active |
| 3641 | * |
| 3642 | * to |
| 3643 | * |
| 3644 | * bottom <- base <- active |
| 3645 | * |
| 3646 | * It is allowed for bottom==base, in which case it converts: |
| 3647 | * |
| 3648 | * base <- intermediate <- top <- active |
| 3649 | * |
| 3650 | * to |
| 3651 | * |
| 3652 | * base <- active |
| 3653 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 3654 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 3655 | * overlay image metadata. |
| 3656 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3657 | * Error conditions: |
| 3658 | * if active == top, that is considered an error |
| 3659 | * |
| 3660 | */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 3661 | int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, |
| 3662 | const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3663 | { |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 3664 | BdrvChild *c, *next; |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3665 | Error *local_err = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3666 | int ret = -EIO; |
| 3667 | |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 3668 | bdrv_ref(top); |
| 3669 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3670 | if (!top->drv || !base->drv) { |
| 3671 | goto exit; |
| 3672 | } |
| 3673 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 3674 | /* Make sure that base is in the backing chain of top */ |
| 3675 | if (!bdrv_chain_contains(top, base)) { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3676 | goto exit; |
| 3677 | } |
| 3678 | |
| 3679 | /* success - we can delete the intermediate states, and link top->base */ |
Kevin Wolf | bde7071 | 2017-06-27 20:36:18 +0200 | [diff] [blame] | 3680 | /* TODO Check graph modification op blockers (BLK_PERM_GRAPH_MOD) once |
| 3681 | * we've figured out how they should work. */ |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 3682 | backing_file_str = backing_file_str ? backing_file_str : base->filename; |
| 3683 | |
| 3684 | QLIST_FOREACH_SAFE(c, &top->parents, next_parent, next) { |
| 3685 | /* Check whether we are allowed to switch c from top to base */ |
| 3686 | GSList *ignore_children = g_slist_prepend(NULL, c); |
| 3687 | bdrv_check_update_perm(base, NULL, c->perm, c->shared_perm, |
| 3688 | ignore_children, &local_err); |
Fam Zheng | 2c860e7 | 2018-03-15 11:51:57 +0800 | [diff] [blame] | 3689 | g_slist_free(ignore_children); |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 3690 | if (local_err) { |
| 3691 | ret = -EPERM; |
| 3692 | error_report_err(local_err); |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 3693 | goto exit; |
| 3694 | } |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3695 | |
Kevin Wolf | 61f09ce | 2017-09-19 16:22:54 +0200 | [diff] [blame] | 3696 | /* If so, update the backing file path in the image file */ |
| 3697 | if (c->role->update_filename) { |
| 3698 | ret = c->role->update_filename(c, base, backing_file_str, |
| 3699 | &local_err); |
| 3700 | if (ret < 0) { |
| 3701 | bdrv_abort_perm_update(base); |
| 3702 | error_report_err(local_err); |
| 3703 | goto exit; |
| 3704 | } |
| 3705 | } |
| 3706 | |
| 3707 | /* Do the actual switch in the in-memory graph. |
| 3708 | * Completes bdrv_check_update_perm() transaction internally. */ |
| 3709 | bdrv_ref(base); |
| 3710 | bdrv_replace_child(c, base); |
| 3711 | bdrv_unref(top); |
Kevin Wolf | 12fa4af | 2017-02-17 20:42:32 +0100 | [diff] [blame] | 3712 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3713 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3714 | ret = 0; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3715 | exit: |
Kevin Wolf | 6858eba | 2017-06-29 19:32:21 +0200 | [diff] [blame] | 3716 | bdrv_unref(top); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 3717 | return ret; |
| 3718 | } |
| 3719 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3720 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3721 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 3722 | */ |
Max Reitz | 7ea37c3 | 2017-06-13 22:20:53 +0200 | [diff] [blame] | 3723 | int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, |
| 3724 | Error **errp) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3725 | { |
Kevin Wolf | 52cdbc5 | 2017-02-16 18:39:03 +0100 | [diff] [blame] | 3726 | BlockDriverState *bs = child->bs; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3727 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3728 | int ret; |
Kevin Wolf | c8f6d58 | 2017-02-17 14:52:00 +0100 | [diff] [blame] | 3729 | |
Max Reitz | 362b378 | 2017-04-11 17:52:26 +0200 | [diff] [blame] | 3730 | assert(child->perm & BLK_PERM_RESIZE); |
Kevin Wolf | c8f6d58 | 2017-02-17 14:52:00 +0100 | [diff] [blame] | 3731 | |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 3732 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3733 | if (!drv) { |
| 3734 | error_setg(errp, "No medium inserted"); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3735 | return -ENOMEDIUM; |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3736 | } |
Kevin Wolf | cd8b7aa | 2018-02-07 17:58:47 +0100 | [diff] [blame] | 3737 | if (offset < 0) { |
| 3738 | error_setg(errp, "Image size cannot be negative"); |
| 3739 | return -EINVAL; |
| 3740 | } |
| 3741 | |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3742 | if (!drv->bdrv_truncate) { |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 3743 | if (bs->file && drv->is_filter) { |
| 3744 | return bdrv_truncate(bs->file, offset, prealloc, errp); |
| 3745 | } |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3746 | error_setg(errp, "Image format driver does not support resize"); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3747 | return -ENOTSUP; |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3748 | } |
| 3749 | if (bs->read_only) { |
| 3750 | error_setg(errp, "Image is read-only"); |
Naphtali Sprei | 59f2689 | 2009-10-26 16:25:16 +0200 | [diff] [blame] | 3751 | return -EACCES; |
Max Reitz | ed3d2ec | 2017-03-28 22:51:27 +0200 | [diff] [blame] | 3752 | } |
Jeff Cody | 9c75e16 | 2014-06-25 16:55:30 -0400 | [diff] [blame] | 3753 | |
Denis V. Lunev | 504c205 | 2017-04-05 18:18:25 +0300 | [diff] [blame] | 3754 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
| 3755 | |
Max Reitz | 7ea37c3 | 2017-06-13 22:20:53 +0200 | [diff] [blame] | 3756 | ret = drv->bdrv_truncate(bs, offset, prealloc, errp); |
Eric Blake | 1b6cc57 | 2017-09-25 09:55:11 -0500 | [diff] [blame] | 3757 | if (ret < 0) { |
| 3758 | return ret; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3759 | } |
Eric Blake | 1b6cc57 | 2017-09-25 09:55:11 -0500 | [diff] [blame] | 3760 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
| 3761 | if (ret < 0) { |
| 3762 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 3763 | } else { |
| 3764 | offset = bs->total_sectors * BDRV_SECTOR_SIZE; |
| 3765 | } |
| 3766 | bdrv_dirty_bitmap_truncate(bs, offset); |
| 3767 | bdrv_parent_cb_resize(bs); |
| 3768 | atomic_inc(&bs->write_gen); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3769 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3770 | } |
| 3771 | |
| 3772 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 3773 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 3774 | * allocated space. Return < 0 if error or unknown. |
| 3775 | */ |
| 3776 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 3777 | { |
| 3778 | BlockDriver *drv = bs->drv; |
| 3779 | if (!drv) { |
| 3780 | return -ENOMEDIUM; |
| 3781 | } |
| 3782 | if (drv->bdrv_get_allocated_file_size) { |
| 3783 | return drv->bdrv_get_allocated_file_size(bs); |
| 3784 | } |
| 3785 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3786 | return bdrv_get_allocated_file_size(bs->file->bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 3787 | } |
| 3788 | return -ENOTSUP; |
| 3789 | } |
| 3790 | |
Stefan Hajnoczi | 90880ff | 2017-07-05 13:57:30 +0100 | [diff] [blame] | 3791 | /* |
| 3792 | * bdrv_measure: |
| 3793 | * @drv: Format driver |
| 3794 | * @opts: Creation options for new image |
| 3795 | * @in_bs: Existing image containing data for new image (may be NULL) |
| 3796 | * @errp: Error object |
| 3797 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) |
| 3798 | * or NULL on error |
| 3799 | * |
| 3800 | * Calculate file size required to create a new image. |
| 3801 | * |
| 3802 | * If @in_bs is given then space for allocated clusters and zero clusters |
| 3803 | * from that image are included in the calculation. If @opts contains a |
| 3804 | * backing file that is shared by @in_bs then backing clusters may be omitted |
| 3805 | * from the calculation. |
| 3806 | * |
| 3807 | * If @in_bs is NULL then the calculation includes no allocated clusters |
| 3808 | * unless a preallocation option is given in @opts. |
| 3809 | * |
| 3810 | * Note that @in_bs may use a different BlockDriver from @drv. |
| 3811 | * |
| 3812 | * If an error occurs the @errp pointer is set. |
| 3813 | */ |
| 3814 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, |
| 3815 | BlockDriverState *in_bs, Error **errp) |
| 3816 | { |
| 3817 | if (!drv->bdrv_measure) { |
| 3818 | error_setg(errp, "Block driver '%s' does not support size measurement", |
| 3819 | drv->format_name); |
| 3820 | return NULL; |
| 3821 | } |
| 3822 | |
| 3823 | return drv->bdrv_measure(opts, in_bs, errp); |
| 3824 | } |
| 3825 | |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 3826 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3827 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3828 | */ |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3829 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3830 | { |
| 3831 | BlockDriver *drv = bs->drv; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3832 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3833 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3834 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3835 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 3836 | if (drv->has_variable_length) { |
| 3837 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 3838 | if (ret < 0) { |
| 3839 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 3840 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3841 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3842 | return bs->total_sectors; |
| 3843 | } |
| 3844 | |
| 3845 | /** |
| 3846 | * Return length in bytes on success, -errno on error. |
| 3847 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 3848 | */ |
| 3849 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 3850 | { |
| 3851 | int64_t ret = bdrv_nb_sectors(bs); |
| 3852 | |
Fam Zheng | 4a9c9ea | 2015-05-15 16:36:05 +0800 | [diff] [blame] | 3853 | ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3854 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3855 | } |
| 3856 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3857 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 3858 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3859 | { |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 3860 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
| 3861 | |
| 3862 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3863 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 3864 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 3865 | bool bdrv_is_sg(BlockDriverState *bs) |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 3866 | { |
| 3867 | return bs->sg; |
| 3868 | } |
| 3869 | |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 3870 | bool bdrv_is_encrypted(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3871 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3872 | if (bs->backing && bs->backing->bs->encrypted) { |
Eric Blake | 5411541 | 2016-06-23 16:37:26 -0600 | [diff] [blame] | 3873 | return true; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3874 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3875 | return bs->encrypted; |
| 3876 | } |
| 3877 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3878 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3879 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3880 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3881 | } |
| 3882 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3883 | static int qsort_strcmp(const void *a, const void *b) |
| 3884 | { |
Max Reitz | ceff5bd | 2016-10-12 22:49:05 +0200 | [diff] [blame] | 3885 | return strcmp(*(char *const *)a, *(char *const *)b); |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3886 | } |
| 3887 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3888 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3889 | void *opaque) |
| 3890 | { |
| 3891 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3892 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3893 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3894 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3895 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 3896 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3897 | if (drv->format_name) { |
| 3898 | bool found = false; |
| 3899 | int i = count; |
| 3900 | while (formats && i && !found) { |
| 3901 | found = !strcmp(formats[--i], drv->format_name); |
| 3902 | } |
| 3903 | |
| 3904 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3905 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3906 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3907 | } |
| 3908 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3909 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3910 | |
Max Reitz | eb0df69 | 2016-10-12 22:49:06 +0200 | [diff] [blame] | 3911 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
| 3912 | const char *format_name = block_driver_modules[i].format_name; |
| 3913 | |
| 3914 | if (format_name) { |
| 3915 | bool found = false; |
| 3916 | int j = count; |
| 3917 | |
| 3918 | while (formats && j && !found) { |
| 3919 | found = !strcmp(formats[--j], format_name); |
| 3920 | } |
| 3921 | |
| 3922 | if (!found) { |
| 3923 | formats = g_renew(const char *, formats, count + 1); |
| 3924 | formats[count++] = format_name; |
| 3925 | } |
| 3926 | } |
| 3927 | } |
| 3928 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 3929 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 3930 | |
| 3931 | for (i = 0; i < count; i++) { |
| 3932 | it(opaque, formats[i]); |
| 3933 | } |
| 3934 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3935 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3936 | } |
| 3937 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3938 | /* This function is to find a node in the bs graph */ |
| 3939 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 3940 | { |
| 3941 | BlockDriverState *bs; |
| 3942 | |
| 3943 | assert(node_name); |
| 3944 | |
| 3945 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 3946 | if (!strcmp(node_name, bs->node_name)) { |
| 3947 | return bs; |
| 3948 | } |
| 3949 | } |
| 3950 | return NULL; |
| 3951 | } |
| 3952 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3953 | /* 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] | 3954 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3955 | { |
| 3956 | BlockDeviceInfoList *list, *entry; |
| 3957 | BlockDriverState *bs; |
| 3958 | |
| 3959 | list = NULL; |
| 3960 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Kevin Wolf | c83f9fb | 2016-03-03 11:37:48 +0100 | [diff] [blame] | 3961 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, errp); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 3962 | if (!info) { |
| 3963 | qapi_free_BlockDeviceInfoList(list); |
| 3964 | return NULL; |
| 3965 | } |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3966 | entry = g_malloc0(sizeof(*entry)); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 3967 | entry->value = info; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3968 | entry->next = list; |
| 3969 | list = entry; |
| 3970 | } |
| 3971 | |
| 3972 | return list; |
| 3973 | } |
| 3974 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3975 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 3976 | const char *node_name, |
| 3977 | Error **errp) |
| 3978 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3979 | BlockBackend *blk; |
| 3980 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3981 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3982 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3983 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3984 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3985 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 3986 | bs = blk_bs(blk); |
| 3987 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 3988 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 3989 | } |
| 3990 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 3991 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3992 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3993 | } |
| 3994 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3995 | if (node_name) { |
| 3996 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3997 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3998 | if (bs) { |
| 3999 | return bs; |
| 4000 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4001 | } |
| 4002 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 4003 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 4004 | device ? device : "", |
| 4005 | node_name ? node_name : ""); |
| 4006 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 4007 | } |
| 4008 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 4009 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 4010 | * return false. If either argument is NULL, return false. */ |
| 4011 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 4012 | { |
| 4013 | while (top && top != base) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4014 | top = backing_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 4015 | } |
| 4016 | |
| 4017 | return top != NULL; |
| 4018 | } |
| 4019 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 4020 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 4021 | { |
| 4022 | if (!bs) { |
| 4023 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 4024 | } |
| 4025 | return QTAILQ_NEXT(bs, node_list); |
| 4026 | } |
| 4027 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 4028 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 4029 | { |
| 4030 | return bs->node_name; |
| 4031 | } |
| 4032 | |
Kevin Wolf | 1f0c461 | 2016-03-22 18:38:44 +0100 | [diff] [blame] | 4033 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4034 | { |
| 4035 | BdrvChild *c; |
| 4036 | const char *name; |
| 4037 | |
| 4038 | /* If multiple parents have a name, just pick the first one. */ |
| 4039 | QLIST_FOREACH(c, &bs->parents, next_parent) { |
| 4040 | if (c->role->get_name) { |
| 4041 | name = c->role->get_name(c); |
| 4042 | if (name && *name) { |
| 4043 | return name; |
| 4044 | } |
| 4045 | } |
| 4046 | } |
| 4047 | |
| 4048 | return NULL; |
| 4049 | } |
| 4050 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 4051 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 4052 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4053 | { |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4054 | return bdrv_get_parent_name(bs) ?: ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4055 | } |
| 4056 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 4057 | /* This can be used to identify nodes that might not have a device |
| 4058 | * name associated. Since node and device names live in the same |
| 4059 | * namespace, the result is unambiguous. The exception is if both are |
| 4060 | * absent, then this returns an empty (non-null) string. */ |
| 4061 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 4062 | { |
Kevin Wolf | 4c265bf | 2016-02-26 10:22:16 +0100 | [diff] [blame] | 4063 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 4064 | } |
| 4065 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 4066 | int bdrv_get_flags(BlockDriverState *bs) |
| 4067 | { |
| 4068 | return bs->open_flags; |
| 4069 | } |
| 4070 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 4071 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 4072 | { |
| 4073 | return 1; |
| 4074 | } |
| 4075 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4076 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 4077 | { |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 4078 | if (!bs->drv) { |
| 4079 | return 0; |
| 4080 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4081 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 4082 | /* If BS is a copy on write image, it is initialized to |
| 4083 | the contents of the base image, which may not be zeroes. */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4084 | if (bs->backing) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 4085 | return 0; |
| 4086 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 4087 | if (bs->drv->bdrv_has_zero_init) { |
| 4088 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4089 | } |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4090 | if (bs->file && bs->drv->is_filter) { |
| 4091 | return bdrv_has_zero_init(bs->file->bs); |
| 4092 | } |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4093 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 4094 | /* safe default */ |
| 4095 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 4096 | } |
| 4097 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4098 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 4099 | { |
| 4100 | BlockDriverInfo bdi; |
| 4101 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4102 | if (bs->backing) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4103 | return false; |
| 4104 | } |
| 4105 | |
| 4106 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 4107 | return bdi.unallocated_blocks_are_zero; |
| 4108 | } |
| 4109 | |
| 4110 | return false; |
| 4111 | } |
| 4112 | |
| 4113 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 4114 | { |
Denis V. Lunev | 2f0342e | 2016-07-14 16:33:26 +0300 | [diff] [blame] | 4115 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4116 | return false; |
| 4117 | } |
| 4118 | |
Eric Blake | e24d813 | 2018-01-26 13:34:39 -0600 | [diff] [blame] | 4119 | return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP; |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 4120 | } |
| 4121 | |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 4122 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 4123 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4124 | if (bs->backing && bs->backing->bs->encrypted) |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 4125 | return bs->backing_file; |
| 4126 | else if (bs->encrypted) |
| 4127 | return bs->filename; |
| 4128 | else |
| 4129 | return NULL; |
| 4130 | } |
| 4131 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4132 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4133 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4134 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 4135 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4136 | } |
| 4137 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4138 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 4139 | { |
| 4140 | BlockDriver *drv = bs->drv; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4141 | /* if bs->drv == NULL, bs is closed, so there's nothing to do here */ |
| 4142 | if (!drv) { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4143 | return -ENOMEDIUM; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4144 | } |
| 4145 | if (!drv->bdrv_get_info) { |
| 4146 | if (bs->file && drv->is_filter) { |
| 4147 | return bdrv_get_info(bs->file->bs, bdi); |
| 4148 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4149 | return -ENOTSUP; |
Manos Pitsidianakis | 5a612c0 | 2017-07-13 18:30:25 +0300 | [diff] [blame] | 4150 | } |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4151 | memset(bdi, 0, sizeof(*bdi)); |
| 4152 | return drv->bdrv_get_info(bs, bdi); |
| 4153 | } |
| 4154 | |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 4155 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
| 4156 | { |
| 4157 | BlockDriver *drv = bs->drv; |
| 4158 | if (drv && drv->bdrv_get_specific_info) { |
| 4159 | return drv->bdrv_get_specific_info(bs); |
| 4160 | } |
| 4161 | return NULL; |
| 4162 | } |
| 4163 | |
Eric Blake | a31939e | 2015-11-18 01:52:54 -0700 | [diff] [blame] | 4164 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4165 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4166 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4167 | return; |
| 4168 | } |
| 4169 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4170 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4171 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4172 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4173 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 4174 | const char *tag) |
| 4175 | { |
| 4176 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4177 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4178 | } |
| 4179 | |
| 4180 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 4181 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 4182 | } |
| 4183 | |
| 4184 | return -ENOTSUP; |
| 4185 | } |
| 4186 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4187 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 4188 | { |
| 4189 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4190 | bs = bs->file ? bs->file->bs : NULL; |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4191 | } |
| 4192 | |
| 4193 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 4194 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 4195 | } |
| 4196 | |
| 4197 | return -ENOTSUP; |
| 4198 | } |
| 4199 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4200 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 4201 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 4202 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4203 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4204 | } |
| 4205 | |
| 4206 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 4207 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 4208 | } |
| 4209 | |
| 4210 | return -ENOTSUP; |
| 4211 | } |
| 4212 | |
| 4213 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 4214 | { |
| 4215 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4216 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4217 | } |
| 4218 | |
| 4219 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 4220 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 4221 | } |
| 4222 | |
| 4223 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4224 | } |
| 4225 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4226 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 4227 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 4228 | * from a BDS as backing_file should not be done, as that may be relative to |
| 4229 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4230 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 4231 | const char *backing_file) |
| 4232 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4233 | char *filename_full = NULL; |
| 4234 | char *backing_file_full = NULL; |
| 4235 | char *filename_tmp = NULL; |
| 4236 | int is_protocol = 0; |
| 4237 | BlockDriverState *curr_bs = NULL; |
| 4238 | BlockDriverState *retval = NULL; |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 4239 | Error *local_error = NULL; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4240 | |
| 4241 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4242 | return NULL; |
| 4243 | } |
| 4244 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4245 | filename_full = g_malloc(PATH_MAX); |
| 4246 | backing_file_full = g_malloc(PATH_MAX); |
| 4247 | filename_tmp = g_malloc(PATH_MAX); |
| 4248 | |
| 4249 | is_protocol = path_has_protocol(backing_file); |
| 4250 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4251 | 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] | 4252 | |
| 4253 | /* If either of the filename paths is actually a protocol, then |
| 4254 | * compare unmodified paths; otherwise make paths relative */ |
| 4255 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 4256 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4257 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4258 | break; |
| 4259 | } |
Jeff Cody | 418661e | 2017-01-25 20:08:20 -0500 | [diff] [blame] | 4260 | /* Also check against the full backing filename for the image */ |
| 4261 | bdrv_get_full_backing_filename(curr_bs, backing_file_full, PATH_MAX, |
| 4262 | &local_error); |
| 4263 | if (local_error == NULL) { |
| 4264 | if (strcmp(backing_file, backing_file_full) == 0) { |
| 4265 | retval = curr_bs->backing->bs; |
| 4266 | break; |
| 4267 | } |
| 4268 | } else { |
| 4269 | error_free(local_error); |
| 4270 | local_error = NULL; |
| 4271 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4272 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4273 | /* If not an absolute filename path, make it relative to the current |
| 4274 | * image's filename path */ |
| 4275 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4276 | backing_file); |
| 4277 | |
| 4278 | /* We are going to compare absolute pathnames */ |
| 4279 | if (!realpath(filename_tmp, filename_full)) { |
| 4280 | continue; |
| 4281 | } |
| 4282 | |
| 4283 | /* We need to make sure the backing filename we are comparing against |
| 4284 | * is relative to the current image filename (or absolute) */ |
| 4285 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4286 | curr_bs->backing_file); |
| 4287 | |
| 4288 | if (!realpath(filename_tmp, backing_file_full)) { |
| 4289 | continue; |
| 4290 | } |
| 4291 | |
| 4292 | if (strcmp(backing_file_full, filename_full) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4293 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4294 | break; |
| 4295 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4296 | } |
| 4297 | } |
| 4298 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4299 | g_free(filename_full); |
| 4300 | g_free(backing_file_full); |
| 4301 | g_free(filename_tmp); |
| 4302 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4303 | } |
| 4304 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4305 | void bdrv_init(void) |
| 4306 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 4307 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4308 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4309 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 4310 | void bdrv_init_with_whitelist(void) |
| 4311 | { |
| 4312 | use_bdrv_whitelist = 1; |
| 4313 | bdrv_init(); |
| 4314 | } |
| 4315 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 4316 | static void coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, |
| 4317 | Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4318 | { |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 4319 | BdrvChild *child, *parent; |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 4320 | uint64_t perm, shared_perm; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4321 | Error *local_err = NULL; |
| 4322 | int ret; |
| 4323 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4324 | if (!bs->drv) { |
| 4325 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4326 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4327 | |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 4328 | if (!(bs->open_flags & BDRV_O_INACTIVE)) { |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 4329 | return; |
| 4330 | } |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 4331 | |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 4332 | QLIST_FOREACH(child, &bs->children, next) { |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 4333 | bdrv_co_invalidate_cache(child->bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 4334 | if (local_err) { |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 4335 | error_propagate(errp, local_err); |
| 4336 | return; |
| 4337 | } |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4338 | } |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 4339 | |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 4340 | /* |
| 4341 | * Update permissions, they may differ for inactive nodes. |
| 4342 | * |
| 4343 | * Note that the required permissions of inactive images are always a |
| 4344 | * subset of the permissions required after activating the image. This |
| 4345 | * allows us to just get the permissions upfront without restricting |
| 4346 | * drv->bdrv_invalidate_cache(). |
| 4347 | * |
| 4348 | * It also means that in error cases, we don't have to try and revert to |
| 4349 | * the old permissions (which is an operation that could fail, too). We can |
| 4350 | * just keep the extended permissions for the next time that an activation |
| 4351 | * of the image is tried. |
| 4352 | */ |
Vladimir Sementsov-Ogievskiy | 16e977d | 2017-01-31 14:23:08 +0300 | [diff] [blame] | 4353 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Kevin Wolf | dafe096 | 2017-11-16 13:00:01 +0100 | [diff] [blame] | 4354 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); |
| 4355 | ret = bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, &local_err); |
| 4356 | if (ret < 0) { |
| 4357 | bs->open_flags |= BDRV_O_INACTIVE; |
| 4358 | error_propagate(errp, local_err); |
| 4359 | return; |
| 4360 | } |
| 4361 | bdrv_set_perm(bs, perm, shared_perm); |
| 4362 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 4363 | if (bs->drv->bdrv_co_invalidate_cache) { |
| 4364 | bs->drv->bdrv_co_invalidate_cache(bs, &local_err); |
Fam Zheng | 0d1c5c9 | 2016-05-11 10:45:33 +0800 | [diff] [blame] | 4365 | if (local_err) { |
| 4366 | bs->open_flags |= BDRV_O_INACTIVE; |
| 4367 | error_propagate(errp, local_err); |
| 4368 | return; |
| 4369 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4370 | } |
| 4371 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4372 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 4373 | if (ret < 0) { |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 4374 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4375 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 4376 | return; |
| 4377 | } |
Kevin Wolf | 4417ab7 | 2017-05-04 18:52:37 +0200 | [diff] [blame] | 4378 | |
| 4379 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
| 4380 | if (parent->role->activate) { |
| 4381 | parent->role->activate(parent, &local_err); |
| 4382 | if (local_err) { |
| 4383 | error_propagate(errp, local_err); |
| 4384 | return; |
| 4385 | } |
| 4386 | } |
| 4387 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4388 | } |
| 4389 | |
Paolo Bonzini | 2b148f3 | 2018-03-01 17:36:18 +0100 | [diff] [blame] | 4390 | typedef struct InvalidateCacheCo { |
| 4391 | BlockDriverState *bs; |
| 4392 | Error **errp; |
| 4393 | bool done; |
| 4394 | } InvalidateCacheCo; |
| 4395 | |
| 4396 | static void coroutine_fn bdrv_invalidate_cache_co_entry(void *opaque) |
| 4397 | { |
| 4398 | InvalidateCacheCo *ico = opaque; |
| 4399 | bdrv_co_invalidate_cache(ico->bs, ico->errp); |
| 4400 | ico->done = true; |
| 4401 | } |
| 4402 | |
| 4403 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
| 4404 | { |
| 4405 | Coroutine *co; |
| 4406 | InvalidateCacheCo ico = { |
| 4407 | .bs = bs, |
| 4408 | .done = false, |
| 4409 | .errp = errp |
| 4410 | }; |
| 4411 | |
| 4412 | if (qemu_in_coroutine()) { |
| 4413 | /* Fast-path if already in coroutine context */ |
| 4414 | bdrv_invalidate_cache_co_entry(&ico); |
| 4415 | } else { |
| 4416 | co = qemu_coroutine_create(bdrv_invalidate_cache_co_entry, &ico); |
| 4417 | qemu_coroutine_enter(co); |
| 4418 | BDRV_POLL_WHILE(bs, !ico.done); |
| 4419 | } |
| 4420 | } |
| 4421 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4422 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4423 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 4424 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4425 | Error *local_err = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 4426 | BdrvNextIterator it; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4427 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 4428 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4429 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4430 | |
| 4431 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4432 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4433 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4434 | if (local_err) { |
| 4435 | error_propagate(errp, local_err); |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 4436 | bdrv_next_cleanup(&it); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4437 | return; |
| 4438 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4439 | } |
| 4440 | } |
| 4441 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4442 | static int bdrv_inactivate_recurse(BlockDriverState *bs, |
| 4443 | bool setting_flag) |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4444 | { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 4445 | BdrvChild *child, *parent; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4446 | int ret; |
| 4447 | |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 4448 | if (!bs->drv) { |
| 4449 | return -ENOMEDIUM; |
| 4450 | } |
| 4451 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4452 | if (!setting_flag && bs->drv->bdrv_inactivate) { |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4453 | ret = bs->drv->bdrv_inactivate(bs); |
| 4454 | if (ret < 0) { |
| 4455 | return ret; |
| 4456 | } |
| 4457 | } |
| 4458 | |
Stefan Hajnoczi | 7d5b526 | 2017-08-23 21:42:42 +0800 | [diff] [blame] | 4459 | if (setting_flag && !(bs->open_flags & BDRV_O_INACTIVE)) { |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 4460 | uint64_t perm, shared_perm; |
| 4461 | |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 4462 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
| 4463 | if (parent->role->inactivate) { |
| 4464 | ret = parent->role->inactivate(parent); |
| 4465 | if (ret < 0) { |
Kevin Wolf | cfa1a57 | 2017-05-04 18:52:38 +0200 | [diff] [blame] | 4466 | return ret; |
| 4467 | } |
| 4468 | } |
| 4469 | } |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 4470 | |
Stefan Hajnoczi | 7d5b526 | 2017-08-23 21:42:42 +0800 | [diff] [blame] | 4471 | bs->open_flags |= BDRV_O_INACTIVE; |
| 4472 | |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 4473 | /* Update permissions, they may differ for inactive nodes */ |
| 4474 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); |
Kevin Wolf | 3121fb4 | 2017-09-14 14:42:12 +0200 | [diff] [blame] | 4475 | bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, &error_abort); |
Kevin Wolf | 9c5e659 | 2017-05-04 18:52:40 +0200 | [diff] [blame] | 4476 | bdrv_set_perm(bs, perm, shared_perm); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4477 | } |
Kevin Wolf | 38701b6 | 2017-05-04 18:52:39 +0200 | [diff] [blame] | 4478 | |
| 4479 | QLIST_FOREACH(child, &bs->children, next) { |
| 4480 | ret = bdrv_inactivate_recurse(child->bs, setting_flag); |
| 4481 | if (ret < 0) { |
| 4482 | return ret; |
| 4483 | } |
| 4484 | } |
| 4485 | |
Vladimir Sementsov-Ogievskiy | 615b5dc | 2017-06-28 15:05:30 +0300 | [diff] [blame] | 4486 | /* At this point persistent bitmaps should be already stored by the format |
| 4487 | * driver */ |
| 4488 | bdrv_release_persistent_dirty_bitmaps(bs); |
| 4489 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4490 | return 0; |
| 4491 | } |
| 4492 | |
| 4493 | int bdrv_inactivate_all(void) |
| 4494 | { |
Max Reitz | 79720af | 2016-03-16 19:54:44 +0100 | [diff] [blame] | 4495 | BlockDriverState *bs = NULL; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 4496 | BdrvNextIterator it; |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4497 | int ret = 0; |
| 4498 | int pass; |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 4499 | GSList *aio_ctxs = NULL, *ctx; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4500 | |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 4501 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 4502 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4503 | |
| 4504 | if (!g_slist_find(aio_ctxs, aio_context)) { |
| 4505 | aio_ctxs = g_slist_prepend(aio_ctxs, aio_context); |
| 4506 | aio_context_acquire(aio_context); |
| 4507 | } |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4508 | } |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4509 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4510 | /* We do two passes of inactivation. The first pass calls to drivers' |
| 4511 | * .bdrv_inactivate callbacks recursively so all cache is flushed to disk; |
| 4512 | * the second pass sets the BDRV_O_INACTIVE flag so that no further write |
| 4513 | * is allowed. */ |
| 4514 | for (pass = 0; pass < 2; pass++) { |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 4515 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4516 | ret = bdrv_inactivate_recurse(bs, pass); |
| 4517 | if (ret < 0) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 4518 | bdrv_next_cleanup(&it); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4519 | goto out; |
| 4520 | } |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4521 | } |
| 4522 | } |
| 4523 | |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4524 | out: |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 4525 | for (ctx = aio_ctxs; ctx != NULL; ctx = ctx->next) { |
| 4526 | AioContext *aio_context = ctx->data; |
| 4527 | aio_context_release(aio_context); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4528 | } |
Paolo Bonzini | bd6458e | 2017-12-07 20:13:15 +0000 | [diff] [blame] | 4529 | g_slist_free(aio_ctxs); |
Fam Zheng | aad0b7a | 2016-05-11 10:45:35 +0800 | [diff] [blame] | 4530 | |
| 4531 | return ret; |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 4532 | } |
| 4533 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4534 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4535 | /* removable device support */ |
| 4536 | |
| 4537 | /** |
| 4538 | * Return TRUE if the media is present |
| 4539 | */ |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 4540 | bool bdrv_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4541 | { |
| 4542 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 4543 | BdrvChild *child; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 4544 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 4545 | if (!drv) { |
| 4546 | return false; |
| 4547 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 4548 | if (drv->bdrv_is_inserted) { |
| 4549 | return drv->bdrv_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 4550 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 4551 | QLIST_FOREACH(child, &bs->children, next) { |
| 4552 | if (!bdrv_is_inserted(child->bs)) { |
| 4553 | return false; |
| 4554 | } |
| 4555 | } |
| 4556 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4557 | } |
| 4558 | |
| 4559 | /** |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4560 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 4561 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 4562 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4563 | { |
| 4564 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4565 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 4566 | if (drv && drv->bdrv_eject) { |
| 4567 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4568 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4569 | } |
| 4570 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4571 | /** |
| 4572 | * Lock or unlock the media (if it is locked, the user won't be able |
| 4573 | * to eject it manually). |
| 4574 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 4575 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4576 | { |
| 4577 | BlockDriver *drv = bs->drv; |
| 4578 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 4579 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 4580 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 4581 | if (drv && drv->bdrv_lock_medium) { |
| 4582 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4583 | } |
| 4584 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 4585 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 4586 | /* Get a reference to bs */ |
| 4587 | void bdrv_ref(BlockDriverState *bs) |
| 4588 | { |
| 4589 | bs->refcnt++; |
| 4590 | } |
| 4591 | |
| 4592 | /* Release a previously grabbed reference to bs. |
| 4593 | * If after releasing, reference count is zero, the BlockDriverState is |
| 4594 | * deleted. */ |
| 4595 | void bdrv_unref(BlockDriverState *bs) |
| 4596 | { |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 4597 | if (!bs) { |
| 4598 | return; |
| 4599 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 4600 | assert(bs->refcnt > 0); |
| 4601 | if (--bs->refcnt == 0) { |
| 4602 | bdrv_delete(bs); |
| 4603 | } |
| 4604 | } |
| 4605 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 4606 | struct BdrvOpBlocker { |
| 4607 | Error *reason; |
| 4608 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 4609 | }; |
| 4610 | |
| 4611 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 4612 | { |
| 4613 | BdrvOpBlocker *blocker; |
| 4614 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 4615 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 4616 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
Eduardo Habkost | 57ef3f1 | 2017-06-08 10:39:03 -0300 | [diff] [blame] | 4617 | error_propagate(errp, error_copy(blocker->reason)); |
| 4618 | error_prepend(errp, "Node '%s' is busy: ", |
| 4619 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 4620 | return true; |
| 4621 | } |
| 4622 | return false; |
| 4623 | } |
| 4624 | |
| 4625 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 4626 | { |
| 4627 | BdrvOpBlocker *blocker; |
| 4628 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 4629 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 4630 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 4631 | blocker->reason = reason; |
| 4632 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 4633 | } |
| 4634 | |
| 4635 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 4636 | { |
| 4637 | BdrvOpBlocker *blocker, *next; |
| 4638 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 4639 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 4640 | if (blocker->reason == reason) { |
| 4641 | QLIST_REMOVE(blocker, list); |
| 4642 | g_free(blocker); |
| 4643 | } |
| 4644 | } |
| 4645 | } |
| 4646 | |
| 4647 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 4648 | { |
| 4649 | int i; |
| 4650 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 4651 | bdrv_op_block(bs, i, reason); |
| 4652 | } |
| 4653 | } |
| 4654 | |
| 4655 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 4656 | { |
| 4657 | int i; |
| 4658 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 4659 | bdrv_op_unblock(bs, i, reason); |
| 4660 | } |
| 4661 | } |
| 4662 | |
| 4663 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 4664 | { |
| 4665 | int i; |
| 4666 | |
| 4667 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 4668 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 4669 | return false; |
| 4670 | } |
| 4671 | } |
| 4672 | return true; |
| 4673 | } |
| 4674 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 4675 | void bdrv_img_create(const char *filename, const char *fmt, |
| 4676 | const char *base_filename, const char *base_fmt, |
Fam Zheng | 9217283 | 2017-04-21 20:27:01 +0800 | [diff] [blame] | 4677 | char *options, uint64_t img_size, int flags, bool quiet, |
| 4678 | Error **errp) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4679 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4680 | QemuOptsList *create_opts = NULL; |
| 4681 | QemuOpts *opts = NULL; |
| 4682 | const char *backing_fmt, *backing_file; |
| 4683 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4684 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4685 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4686 | int ret = 0; |
| 4687 | |
| 4688 | /* Find driver and parse its options */ |
| 4689 | drv = bdrv_find_format(fmt); |
| 4690 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 4691 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 4692 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4693 | } |
| 4694 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 4695 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4696 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 4697 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4698 | } |
| 4699 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 4700 | if (!drv->create_opts) { |
| 4701 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 4702 | drv->format_name); |
| 4703 | return; |
| 4704 | } |
| 4705 | |
| 4706 | if (!proto_drv->create_opts) { |
| 4707 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 4708 | proto_drv->format_name); |
| 4709 | return; |
| 4710 | } |
| 4711 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 4712 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 4713 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4714 | |
| 4715 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4716 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 4717 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4718 | |
| 4719 | /* Parse -o options */ |
| 4720 | if (options) { |
Markus Armbruster | dc523cd34 | 2015-02-12 18:37:11 +0100 | [diff] [blame] | 4721 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
| 4722 | if (local_err) { |
| 4723 | error_report_err(local_err); |
| 4724 | local_err = NULL; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4725 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4726 | goto out; |
| 4727 | } |
| 4728 | } |
| 4729 | |
| 4730 | if (base_filename) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 4731 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 4732 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 4733 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 4734 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4735 | goto out; |
| 4736 | } |
| 4737 | } |
| 4738 | |
| 4739 | if (base_fmt) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 4740 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 4741 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 4742 | error_setg(errp, "Backing file format not supported for file " |
| 4743 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4744 | goto out; |
| 4745 | } |
| 4746 | } |
| 4747 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4748 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 4749 | if (backing_file) { |
| 4750 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 4751 | error_setg(errp, "Error: Trying to create an image with the " |
| 4752 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 4753 | goto out; |
| 4754 | } |
| 4755 | } |
| 4756 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4757 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4758 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4759 | /* The size for the image must always be specified, unless we have a backing |
| 4760 | * file and we have not been forbidden from opening it. */ |
Eric Blake | a8b42a1 | 2017-09-25 09:55:07 -0500 | [diff] [blame] | 4761 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4762 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
| 4763 | BlockDriverState *bs; |
| 4764 | char *full_backing = g_new0(char, PATH_MAX); |
| 4765 | int back_flags; |
| 4766 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 4767 | |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4768 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 4769 | full_backing, PATH_MAX, |
| 4770 | &local_err); |
| 4771 | if (local_err) { |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 4772 | g_free(full_backing); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4773 | goto out; |
| 4774 | } |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4775 | |
| 4776 | /* backing files always opened read-only */ |
| 4777 | back_flags = flags; |
| 4778 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 4779 | |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 4780 | backing_options = qdict_new(); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4781 | if (backing_fmt) { |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4782 | qdict_put_str(backing_options, "driver", backing_fmt); |
| 4783 | } |
Fam Zheng | cc954f0 | 2017-12-15 16:04:45 +0800 | [diff] [blame] | 4784 | qdict_put_bool(backing_options, BDRV_OPT_FORCE_SHARE, true); |
John Snow | 6e6e55f | 2017-07-17 20:34:22 -0400 | [diff] [blame] | 4785 | |
| 4786 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
| 4787 | &local_err); |
| 4788 | g_free(full_backing); |
| 4789 | if (!bs && size != -1) { |
| 4790 | /* Couldn't open BS, but we have a size, so it's nonfatal */ |
| 4791 | warn_reportf_err(local_err, |
| 4792 | "Could not verify backing image. " |
| 4793 | "This may become an error in future versions.\n"); |
| 4794 | local_err = NULL; |
| 4795 | } else if (!bs) { |
| 4796 | /* Couldn't open bs, do not have size */ |
| 4797 | error_append_hint(&local_err, |
| 4798 | "Could not open backing image to determine size.\n"); |
| 4799 | goto out; |
| 4800 | } else { |
| 4801 | if (size == -1) { |
| 4802 | /* Opened BS, have no size */ |
| 4803 | size = bdrv_getlength(bs); |
| 4804 | if (size < 0) { |
| 4805 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 4806 | backing_file); |
| 4807 | bdrv_unref(bs); |
| 4808 | goto out; |
| 4809 | } |
| 4810 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
| 4811 | } |
| 4812 | bdrv_unref(bs); |
| 4813 | } |
| 4814 | } /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
| 4815 | |
| 4816 | if (size == -1) { |
| 4817 | error_setg(errp, "Image creation needs a size parameter"); |
| 4818 | goto out; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4819 | } |
| 4820 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 4821 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 4822 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 4823 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 4824 | puts(""); |
| 4825 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4826 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 4827 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4828 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4829 | if (ret == -EFBIG) { |
| 4830 | /* This is generally a better message than whatever the driver would |
| 4831 | * deliver (especially because of the cluster_size_hint), since that |
| 4832 | * is most probably not much different from "image too large". */ |
| 4833 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4834 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4835 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4836 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4837 | error_setg(errp, "The image size is too large for file format '%s'" |
| 4838 | "%s", fmt, cluster_size_hint); |
| 4839 | error_free(local_err); |
| 4840 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4841 | } |
| 4842 | |
| 4843 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4844 | qemu_opts_del(opts); |
| 4845 | qemu_opts_free(create_opts); |
Eduardo Habkost | 621ff94 | 2016-06-13 18:57:56 -0300 | [diff] [blame] | 4846 | error_propagate(errp, local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4847 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 4848 | |
| 4849 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 4850 | { |
Stefan Hajnoczi | 33f2a75 | 2018-02-16 16:50:13 +0000 | [diff] [blame] | 4851 | return bs ? bs->aio_context : qemu_get_aio_context(); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4852 | } |
| 4853 | |
Stefan Hajnoczi | 7719f3c | 2018-02-16 16:50:12 +0000 | [diff] [blame] | 4854 | AioWait *bdrv_get_aio_wait(BlockDriverState *bs) |
| 4855 | { |
| 4856 | return bs ? &bs->wait : NULL; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4857 | } |
| 4858 | |
Fam Zheng | 052a757 | 2017-04-10 20:09:25 +0800 | [diff] [blame] | 4859 | void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co) |
| 4860 | { |
| 4861 | aio_co_enter(bdrv_get_aio_context(bs), co); |
| 4862 | } |
| 4863 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4864 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
| 4865 | { |
| 4866 | QLIST_REMOVE(ban, list); |
| 4867 | g_free(ban); |
| 4868 | } |
| 4869 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4870 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 4871 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4872 | BdrvAioNotifier *baf, *baf_tmp; |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 4873 | BdrvChild *child; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4874 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4875 | if (!bs->drv) { |
| 4876 | return; |
| 4877 | } |
| 4878 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4879 | assert(!bs->walking_aio_notifiers); |
| 4880 | bs->walking_aio_notifiers = true; |
| 4881 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { |
| 4882 | if (baf->deleted) { |
| 4883 | bdrv_do_remove_aio_context_notifier(baf); |
| 4884 | } else { |
| 4885 | baf->detach_aio_context(baf->opaque); |
| 4886 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4887 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4888 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
| 4889 | * remove remaining aio notifiers if we aren't called again. |
| 4890 | */ |
| 4891 | bs->walking_aio_notifiers = false; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4892 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4893 | if (bs->drv->bdrv_detach_aio_context) { |
| 4894 | bs->drv->bdrv_detach_aio_context(bs); |
| 4895 | } |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 4896 | QLIST_FOREACH(child, &bs->children, next) { |
| 4897 | bdrv_detach_aio_context(child->bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4898 | } |
| 4899 | |
| 4900 | bs->aio_context = NULL; |
| 4901 | } |
| 4902 | |
| 4903 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 4904 | AioContext *new_context) |
| 4905 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4906 | BdrvAioNotifier *ban, *ban_tmp; |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 4907 | BdrvChild *child; |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4908 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4909 | if (!bs->drv) { |
| 4910 | return; |
| 4911 | } |
| 4912 | |
| 4913 | bs->aio_context = new_context; |
| 4914 | |
Max Reitz | b97511c | 2016-05-17 13:38:04 +0200 | [diff] [blame] | 4915 | QLIST_FOREACH(child, &bs->children, next) { |
| 4916 | bdrv_attach_aio_context(child->bs, new_context); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4917 | } |
| 4918 | if (bs->drv->bdrv_attach_aio_context) { |
| 4919 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 4920 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4921 | |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4922 | assert(!bs->walking_aio_notifiers); |
| 4923 | bs->walking_aio_notifiers = true; |
| 4924 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { |
| 4925 | if (ban->deleted) { |
| 4926 | bdrv_do_remove_aio_context_notifier(ban); |
| 4927 | } else { |
| 4928 | ban->attached_aio_context(new_context, ban->opaque); |
| 4929 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4930 | } |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4931 | bs->walking_aio_notifiers = false; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4932 | } |
| 4933 | |
| 4934 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 4935 | { |
Fam Zheng | aabf591 | 2017-04-05 14:44:24 +0800 | [diff] [blame] | 4936 | AioContext *ctx = bdrv_get_aio_context(bs); |
Paolo Bonzini | c2b6428 | 2017-03-14 12:11:57 +0100 | [diff] [blame] | 4937 | |
Fam Zheng | aabf591 | 2017-04-05 14:44:24 +0800 | [diff] [blame] | 4938 | aio_disable_external(ctx); |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 4939 | bdrv_parent_drained_begin(bs, NULL); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 4940 | bdrv_drain(bs); /* ensure there are no in-flight requests */ |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4941 | |
Paolo Bonzini | c2b6428 | 2017-03-14 12:11:57 +0100 | [diff] [blame] | 4942 | while (aio_poll(ctx, false)) { |
| 4943 | /* wait for all bottom halves to execute */ |
| 4944 | } |
| 4945 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4946 | bdrv_detach_aio_context(bs); |
| 4947 | |
| 4948 | /* This function executes in the old AioContext so acquire the new one in |
| 4949 | * case it runs in a different thread. |
| 4950 | */ |
| 4951 | aio_context_acquire(new_context); |
| 4952 | bdrv_attach_aio_context(bs, new_context); |
Kevin Wolf | 0152bf4 | 2017-12-07 13:03:13 +0100 | [diff] [blame] | 4953 | bdrv_parent_drained_end(bs, NULL); |
Fam Zheng | aabf591 | 2017-04-05 14:44:24 +0800 | [diff] [blame] | 4954 | aio_enable_external(ctx); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4955 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 4956 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 4957 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4958 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 4959 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 4960 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 4961 | { |
| 4962 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 4963 | *ban = (BdrvAioNotifier){ |
| 4964 | .attached_aio_context = attached_aio_context, |
| 4965 | .detach_aio_context = detach_aio_context, |
| 4966 | .opaque = opaque |
| 4967 | }; |
| 4968 | |
| 4969 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 4970 | } |
| 4971 | |
| 4972 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 4973 | void (*attached_aio_context)(AioContext *, |
| 4974 | void *), |
| 4975 | void (*detach_aio_context)(void *), |
| 4976 | void *opaque) |
| 4977 | { |
| 4978 | BdrvAioNotifier *ban, *ban_next; |
| 4979 | |
| 4980 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 4981 | if (ban->attached_aio_context == attached_aio_context && |
| 4982 | ban->detach_aio_context == detach_aio_context && |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4983 | ban->opaque == opaque && |
| 4984 | ban->deleted == false) |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4985 | { |
Stefan Hajnoczi | e8a095d | 2016-06-16 17:56:26 +0100 | [diff] [blame] | 4986 | if (bs->walking_aio_notifiers) { |
| 4987 | ban->deleted = true; |
| 4988 | } else { |
| 4989 | bdrv_do_remove_aio_context_notifier(ban); |
| 4990 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4991 | return; |
| 4992 | } |
| 4993 | } |
| 4994 | |
| 4995 | abort(); |
| 4996 | } |
| 4997 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 4998 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame^] | 4999 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
| 5000 | Error **errp) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5001 | { |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5002 | if (!bs->drv) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame^] | 5003 | error_setg(errp, "Node is ejected"); |
Max Reitz | d470ad4 | 2017-11-10 21:31:09 +0100 | [diff] [blame] | 5004 | return -ENOMEDIUM; |
| 5005 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5006 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame^] | 5007 | error_setg(errp, "Block driver '%s' does not support option amendment", |
| 5008 | bs->drv->format_name); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5009 | return -ENOTSUP; |
| 5010 | } |
Max Reitz | d1402b5 | 2018-05-09 23:00:18 +0200 | [diff] [blame^] | 5011 | 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] | 5012 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5013 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5014 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 5015 | * of block filter and by bdrv_is_first_non_filter. |
| 5016 | * It is used to test if the given bs is the candidate or recurse more in the |
| 5017 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5018 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5019 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 5020 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5021 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5022 | /* return false if basic checks fails */ |
| 5023 | if (!bs || !bs->drv) { |
| 5024 | return false; |
| 5025 | } |
| 5026 | |
| 5027 | /* the code reached a non block filter driver -> check if the bs is |
| 5028 | * the same as the candidate. It's the recursion termination condition. |
| 5029 | */ |
| 5030 | if (!bs->drv->is_filter) { |
| 5031 | return bs == candidate; |
| 5032 | } |
| 5033 | /* Down this path the driver is a block filter driver */ |
| 5034 | |
| 5035 | /* If the block filter recursion method is defined use it to recurse down |
| 5036 | * the node graph. |
| 5037 | */ |
| 5038 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5039 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 5040 | } |
| 5041 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5042 | /* the driver is a block filter but don't allow to recurse -> return false |
| 5043 | */ |
| 5044 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5045 | } |
| 5046 | |
| 5047 | /* This function checks if the candidate is the first non filter bs down it's |
| 5048 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 5049 | * from the top. Some filters can choose not to pass down the recursion. |
| 5050 | */ |
| 5051 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 5052 | { |
Kevin Wolf | 7c8eece | 2016-03-22 18:58:50 +0100 | [diff] [blame] | 5053 | BlockDriverState *bs; |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5054 | BdrvNextIterator it; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5055 | |
| 5056 | /* walk down the bs forest recursively */ |
Kevin Wolf | 88be7b4 | 2016-05-20 18:49:07 +0200 | [diff] [blame] | 5057 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5058 | bool perm; |
| 5059 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5060 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 5061 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5062 | |
| 5063 | /* candidate is the first non filter */ |
| 5064 | if (perm) { |
Max Reitz | 5e003f1 | 2017-11-10 18:25:45 +0100 | [diff] [blame] | 5065 | bdrv_next_cleanup(&it); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5066 | return true; |
| 5067 | } |
| 5068 | } |
| 5069 | |
| 5070 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5071 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5072 | |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 5073 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 5074 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5075 | { |
| 5076 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5077 | AioContext *aio_context; |
| 5078 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5079 | if (!to_replace_bs) { |
| 5080 | error_setg(errp, "Node name '%s' not found", node_name); |
| 5081 | return NULL; |
| 5082 | } |
| 5083 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5084 | aio_context = bdrv_get_aio_context(to_replace_bs); |
| 5085 | aio_context_acquire(aio_context); |
| 5086 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5087 | 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] | 5088 | to_replace_bs = NULL; |
| 5089 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5090 | } |
| 5091 | |
| 5092 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 5093 | * most non filter in order to prevent data corruption. |
| 5094 | * Another benefit is that this tests exclude backing files which are |
| 5095 | * blocked by the backing blockers. |
| 5096 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 5097 | if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5098 | error_setg(errp, "Only top most non filter can be replaced"); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5099 | to_replace_bs = NULL; |
| 5100 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5101 | } |
| 5102 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 5103 | out: |
| 5104 | aio_context_release(aio_context); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5105 | return to_replace_bs; |
| 5106 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 5107 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5108 | static bool append_open_options(QDict *d, BlockDriverState *bs) |
| 5109 | { |
| 5110 | const QDictEntry *entry; |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 5111 | QemuOptDesc *desc; |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 5112 | BdrvChild *child; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5113 | bool found_any = false; |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 5114 | const char *p; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5115 | |
| 5116 | for (entry = qdict_first(bs->options); entry; |
| 5117 | entry = qdict_next(bs->options, entry)) |
| 5118 | { |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 5119 | /* Exclude options for children */ |
| 5120 | QLIST_FOREACH(child, &bs->children, next) { |
| 5121 | if (strstart(qdict_entry_key(entry), child->name, &p) |
| 5122 | && (!*p || *p == '.')) |
| 5123 | { |
| 5124 | break; |
| 5125 | } |
| 5126 | } |
| 5127 | if (child) { |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 5128 | continue; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5129 | } |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 5130 | |
| 5131 | /* And exclude all non-driver-specific options */ |
| 5132 | for (desc = bdrv_runtime_opts.desc; desc->name; desc++) { |
| 5133 | if (!strcmp(qdict_entry_key(entry), desc->name)) { |
| 5134 | break; |
| 5135 | } |
| 5136 | } |
| 5137 | if (desc->name) { |
| 5138 | continue; |
| 5139 | } |
| 5140 | |
Marc-André Lureau | f5a74a5 | 2018-04-19 17:01:44 +0200 | [diff] [blame] | 5141 | qdict_put_obj(d, qdict_entry_key(entry), |
| 5142 | qobject_ref(qdict_entry_value(entry))); |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 5143 | found_any = true; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5144 | } |
| 5145 | |
| 5146 | return found_any; |
| 5147 | } |
| 5148 | |
| 5149 | /* Updates the following BDS fields: |
| 5150 | * - exact_filename: A filename which may be used for opening a block device |
| 5151 | * which (mostly) equals the given BDS (even without any |
| 5152 | * other options; so reading and writing must return the same |
| 5153 | * results, but caching etc. may be different) |
| 5154 | * - full_open_options: Options which, when given when opening a block device |
| 5155 | * (without a filename), result in a BDS (mostly) |
| 5156 | * equalling the given one |
| 5157 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 5158 | * full_open_options is converted to a JSON object, prefixed with |
| 5159 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 5160 | */ |
| 5161 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 5162 | { |
| 5163 | BlockDriver *drv = bs->drv; |
| 5164 | QDict *opts; |
| 5165 | |
| 5166 | if (!drv) { |
| 5167 | return; |
| 5168 | } |
| 5169 | |
| 5170 | /* This BDS's file name will most probably depend on its file's name, so |
| 5171 | * refresh that first */ |
| 5172 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5173 | bdrv_refresh_filename(bs->file->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5174 | } |
| 5175 | |
| 5176 | if (drv->bdrv_refresh_filename) { |
| 5177 | /* Obsolete information is of no use here, so drop the old file name |
| 5178 | * information before refreshing it */ |
| 5179 | bs->exact_filename[0] = '\0'; |
| 5180 | if (bs->full_open_options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5181 | qobject_unref(bs->full_open_options); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5182 | bs->full_open_options = NULL; |
| 5183 | } |
| 5184 | |
Kevin Wolf | 4cdd01d | 2015-04-27 13:50:54 +0200 | [diff] [blame] | 5185 | opts = qdict_new(); |
| 5186 | append_open_options(opts, bs); |
| 5187 | drv->bdrv_refresh_filename(bs, opts); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5188 | qobject_unref(opts); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5189 | } else if (bs->file) { |
| 5190 | /* Try to reconstruct valid information from the underlying file */ |
| 5191 | bool has_open_options; |
| 5192 | |
| 5193 | bs->exact_filename[0] = '\0'; |
| 5194 | if (bs->full_open_options) { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5195 | qobject_unref(bs->full_open_options); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5196 | bs->full_open_options = NULL; |
| 5197 | } |
| 5198 | |
| 5199 | opts = qdict_new(); |
| 5200 | has_open_options = append_open_options(opts, bs); |
| 5201 | |
| 5202 | /* If no specific options have been given for this BDS, the filename of |
| 5203 | * the underlying file should suffice for this one as well */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5204 | if (bs->file->bs->exact_filename[0] && !has_open_options) { |
| 5205 | strcpy(bs->exact_filename, bs->file->bs->exact_filename); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5206 | } |
| 5207 | /* Reconstructing the full options QDict is simple for most format block |
| 5208 | * drivers, as long as the full options are known for the underlying |
| 5209 | * file BDS. The full options QDict of that file BDS should somehow |
| 5210 | * contain a representation of the filename, therefore the following |
| 5211 | * suffices without querying the (exact_)filename of this BDS. */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 5212 | if (bs->file->bs->full_open_options) { |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 5213 | qdict_put_str(opts, "driver", drv->format_name); |
Marc-André Lureau | f5a74a5 | 2018-04-19 17:01:44 +0200 | [diff] [blame] | 5214 | qdict_put(opts, "file", |
| 5215 | qobject_ref(bs->file->bs->full_open_options)); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5216 | |
| 5217 | bs->full_open_options = opts; |
| 5218 | } else { |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5219 | qobject_unref(opts); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5220 | } |
| 5221 | } else if (!bs->full_open_options && qdict_size(bs->options)) { |
| 5222 | /* There is no underlying file BDS (at least referenced by BDS.file), |
| 5223 | * so the full options QDict should be equal to the options given |
| 5224 | * specifically for this block device when it was opened (plus the |
| 5225 | * driver specification). |
| 5226 | * Because those options don't change, there is no need to update |
| 5227 | * full_open_options when it's already set. */ |
| 5228 | |
| 5229 | opts = qdict_new(); |
| 5230 | append_open_options(opts, bs); |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 5231 | qdict_put_str(opts, "driver", drv->format_name); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5232 | |
| 5233 | if (bs->exact_filename[0]) { |
| 5234 | /* This may not work for all block protocol drivers (some may |
| 5235 | * require this filename to be parsed), but we have to find some |
| 5236 | * default solution here, so just include it. If some block driver |
| 5237 | * does not support pure options without any filename at all or |
| 5238 | * needs some special format of the options QDict, it needs to |
| 5239 | * implement the driver-specific bdrv_refresh_filename() function. |
| 5240 | */ |
Eric Blake | 46f5ac2 | 2017-04-27 16:58:17 -0500 | [diff] [blame] | 5241 | qdict_put_str(opts, "filename", bs->exact_filename); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5242 | } |
| 5243 | |
| 5244 | bs->full_open_options = opts; |
| 5245 | } |
| 5246 | |
| 5247 | if (bs->exact_filename[0]) { |
| 5248 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
| 5249 | } else if (bs->full_open_options) { |
| 5250 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
| 5251 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
| 5252 | qstring_get_str(json)); |
Marc-André Lureau | cb3e7f0 | 2018-04-19 17:01:43 +0200 | [diff] [blame] | 5253 | qobject_unref(json); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 5254 | } |
| 5255 | } |
Wen Congyang | e06018a | 2016-05-10 15:36:37 +0800 | [diff] [blame] | 5256 | |
| 5257 | /* |
| 5258 | * Hot add/remove a BDS's child. So the user can take a child offline when |
| 5259 | * it is broken and take a new child online |
| 5260 | */ |
| 5261 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, |
| 5262 | Error **errp) |
| 5263 | { |
| 5264 | |
| 5265 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { |
| 5266 | error_setg(errp, "The node %s does not support adding a child", |
| 5267 | bdrv_get_device_or_node_name(parent_bs)); |
| 5268 | return; |
| 5269 | } |
| 5270 | |
| 5271 | if (!QLIST_EMPTY(&child_bs->parents)) { |
| 5272 | error_setg(errp, "The node %s already has a parent", |
| 5273 | child_bs->node_name); |
| 5274 | return; |
| 5275 | } |
| 5276 | |
| 5277 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); |
| 5278 | } |
| 5279 | |
| 5280 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) |
| 5281 | { |
| 5282 | BdrvChild *tmp; |
| 5283 | |
| 5284 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { |
| 5285 | error_setg(errp, "The node %s does not support removing a child", |
| 5286 | bdrv_get_device_or_node_name(parent_bs)); |
| 5287 | return; |
| 5288 | } |
| 5289 | |
| 5290 | QLIST_FOREACH(tmp, &parent_bs->children, next) { |
| 5291 | if (tmp == child) { |
| 5292 | break; |
| 5293 | } |
| 5294 | } |
| 5295 | |
| 5296 | if (!tmp) { |
| 5297 | error_setg(errp, "The node %s does not have a child named %s", |
| 5298 | bdrv_get_device_or_node_name(parent_bs), |
| 5299 | bdrv_get_device_or_node_name(child->bs)); |
| 5300 | return; |
| 5301 | } |
| 5302 | |
| 5303 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); |
| 5304 | } |
Vladimir Sementsov-Ogievskiy | 67b792f | 2017-06-28 15:05:21 +0300 | [diff] [blame] | 5305 | |
| 5306 | bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, |
| 5307 | uint32_t granularity, Error **errp) |
| 5308 | { |
| 5309 | BlockDriver *drv = bs->drv; |
| 5310 | |
| 5311 | if (!drv) { |
| 5312 | error_setg_errno(errp, ENOMEDIUM, |
| 5313 | "Can't store persistent bitmaps to %s", |
| 5314 | bdrv_get_device_or_node_name(bs)); |
| 5315 | return false; |
| 5316 | } |
| 5317 | |
| 5318 | if (!drv->bdrv_can_store_new_dirty_bitmap) { |
| 5319 | error_setg_errno(errp, ENOTSUP, |
| 5320 | "Can't store persistent bitmaps to %s", |
| 5321 | bdrv_get_device_or_node_name(bs)); |
| 5322 | return false; |
| 5323 | } |
| 5324 | |
| 5325 | return drv->bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp); |
| 5326 | } |