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 | */ |
blueswir1 | 3990d09 | 2008-12-05 17:53:21 +0000 | [diff] [blame] | 24 | #include "config-host.h" |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 25 | #include "qemu-common.h" |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 26 | #include "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" |
Markus Armbruster | d49b683 | 2015-03-17 18:29:20 +0100 | [diff] [blame] | 29 | #include "qemu/error-report.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 30 | #include "qemu/module.h" |
Markus Armbruster | cc7a8ea | 2015-03-17 17:22:46 +0100 | [diff] [blame] | 31 | #include "qapi/qmp/qerror.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 32 | #include "qapi/qmp/qjson.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 33 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 34 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 35 | #include "qemu/notify.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 36 | #include "block/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 37 | #include "block/qapi.h" |
Luiz Capitulino | b202381 | 2011-09-21 17:16:47 -0300 | [diff] [blame] | 38 | #include "qmp-commands.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 39 | #include "qemu/timer.h" |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 40 | #include "qapi-event.h" |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 41 | #include "block/throttle-groups.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 42 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 43 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 44 | #include <sys/types.h> |
| 45 | #include <sys/stat.h> |
| 46 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 47 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 48 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 49 | #include <sys/disk.h> |
| 50 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 51 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 52 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 53 | #ifdef _WIN32 |
| 54 | #include <windows.h> |
| 55 | #endif |
| 56 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 57 | /** |
| 58 | * A BdrvDirtyBitmap can be in three possible states: |
| 59 | * (1) successor is NULL and disabled is false: full r/w mode |
| 60 | * (2) successor is NULL and disabled is true: read only mode ("disabled") |
| 61 | * (3) successor is set: frozen mode. |
| 62 | * A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set, |
| 63 | * or enabled. A frozen bitmap can only abdicate() or reclaim(). |
| 64 | */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 65 | struct BdrvDirtyBitmap { |
John Snow | aa0c7ca | 2015-04-17 19:50:01 -0400 | [diff] [blame] | 66 | HBitmap *bitmap; /* Dirty sector bitmap implementation */ |
| 67 | BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ |
| 68 | char *name; /* Optional non-empty unique ID */ |
| 69 | int64_t size; /* Size of the bitmap (Number of sectors) */ |
| 70 | bool disabled; /* Bitmap is read-only */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 71 | QLIST_ENTRY(BdrvDirtyBitmap) list; |
| 72 | }; |
| 73 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 74 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 75 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 76 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
| 77 | QTAILQ_HEAD_INITIALIZER(bdrv_states); |
blueswir1 | 7ee930d | 2008-09-17 19:04:14 +0000 | [diff] [blame] | 78 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 79 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 80 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 81 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 82 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 83 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 84 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 85 | static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, |
| 86 | const char *reference, QDict *options, int flags, |
| 87 | BlockDriverState *parent, |
| 88 | const BdrvChildRole *child_role, |
| 89 | BlockDriver *drv, Error **errp); |
| 90 | |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 91 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 92 | /* If non-zero, use only whitelisted block drivers */ |
| 93 | static int use_bdrv_whitelist; |
| 94 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 95 | #ifdef _WIN32 |
| 96 | static int is_windows_drive_prefix(const char *filename) |
| 97 | { |
| 98 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 99 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 100 | filename[1] == ':'); |
| 101 | } |
| 102 | |
| 103 | int is_windows_drive(const char *filename) |
| 104 | { |
| 105 | if (is_windows_drive_prefix(filename) && |
| 106 | filename[2] == '\0') |
| 107 | return 1; |
| 108 | if (strstart(filename, "\\\\.\\", NULL) || |
| 109 | strstart(filename, "//./", NULL)) |
| 110 | return 1; |
| 111 | return 0; |
| 112 | } |
| 113 | #endif |
| 114 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 115 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 116 | { |
| 117 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 118 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 119 | return MAX(4096, getpagesize()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | return bs->bl.opt_mem_alignment; |
| 123 | } |
| 124 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 125 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 126 | { |
| 127 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 128 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 129 | return MAX(4096, getpagesize()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | return bs->bl.min_mem_alignment; |
| 133 | } |
| 134 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 135 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 136 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 137 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 138 | const char *p; |
| 139 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 140 | #ifdef _WIN32 |
| 141 | if (is_windows_drive(path) || |
| 142 | is_windows_drive_prefix(path)) { |
| 143 | return 0; |
| 144 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 145 | p = path + strcspn(path, ":/\\"); |
| 146 | #else |
| 147 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 148 | #endif |
| 149 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 150 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 151 | } |
| 152 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 153 | int path_is_absolute(const char *path) |
| 154 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 155 | #ifdef _WIN32 |
| 156 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 157 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 158 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 159 | } |
| 160 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 161 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 162 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 163 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 167 | path to it by considering it is relative to base_path. URL are |
| 168 | supported. */ |
| 169 | void path_combine(char *dest, int dest_size, |
| 170 | const char *base_path, |
| 171 | const char *filename) |
| 172 | { |
| 173 | const char *p, *p1; |
| 174 | int len; |
| 175 | |
| 176 | if (dest_size <= 0) |
| 177 | return; |
| 178 | if (path_is_absolute(filename)) { |
| 179 | pstrcpy(dest, dest_size, filename); |
| 180 | } else { |
| 181 | p = strchr(base_path, ':'); |
| 182 | if (p) |
| 183 | p++; |
| 184 | else |
| 185 | p = base_path; |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 186 | p1 = strrchr(base_path, '/'); |
| 187 | #ifdef _WIN32 |
| 188 | { |
| 189 | const char *p2; |
| 190 | p2 = strrchr(base_path, '\\'); |
| 191 | if (!p1 || p2 > p1) |
| 192 | p1 = p2; |
| 193 | } |
| 194 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 195 | if (p1) |
| 196 | p1++; |
| 197 | else |
| 198 | p1 = base_path; |
| 199 | if (p1 > p) |
| 200 | p = p1; |
| 201 | len = p - base_path; |
| 202 | if (len > dest_size - 1) |
| 203 | len = dest_size - 1; |
| 204 | memcpy(dest, base_path, len); |
| 205 | dest[len] = '\0'; |
| 206 | pstrcat(dest, dest_size, filename); |
| 207 | } |
| 208 | } |
| 209 | |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 210 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 211 | const char *backing, |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 212 | char *dest, size_t sz, |
| 213 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 214 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 215 | if (backing[0] == '\0' || path_has_protocol(backing) || |
| 216 | path_is_absolute(backing)) |
| 217 | { |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 218 | pstrcpy(dest, sz, backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 219 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 220 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 221 | backed); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 222 | } else { |
| 223 | path_combine(dest, sz, backed, backing); |
| 224 | } |
| 225 | } |
| 226 | |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 227 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
| 228 | Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 229 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 230 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
| 231 | |
| 232 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, |
| 233 | dest, sz, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 234 | } |
| 235 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 236 | void bdrv_register(BlockDriver *bdrv) |
| 237 | { |
| 238 | bdrv_setup_io_funcs(bdrv); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 239 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 240 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 241 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 242 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 243 | BlockDriverState *bdrv_new_root(void) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 244 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 245 | BlockDriverState *bs = bdrv_new(); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 246 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 247 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 248 | return bs; |
| 249 | } |
| 250 | |
| 251 | BlockDriverState *bdrv_new(void) |
| 252 | { |
| 253 | BlockDriverState *bs; |
| 254 | int i; |
| 255 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 256 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 257 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 258 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 259 | QLIST_INIT(&bs->op_blockers[i]); |
| 260 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 261 | bdrv_iostatus_disable(bs); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 262 | notifier_list_init(&bs->close_notifiers); |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 263 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 264 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
| 265 | qemu_co_queue_init(&bs->throttled_reqs[1]); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 266 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 267 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 268 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 269 | return bs; |
| 270 | } |
| 271 | |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 272 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
| 273 | { |
| 274 | notifier_list_add(&bs->close_notifiers, notify); |
| 275 | } |
| 276 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 277 | BlockDriver *bdrv_find_format(const char *format_name) |
| 278 | { |
| 279 | BlockDriver *drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 280 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 281 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 282 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 283 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 284 | } |
| 285 | return NULL; |
| 286 | } |
| 287 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 288 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 289 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 290 | static const char *whitelist_rw[] = { |
| 291 | CONFIG_BDRV_RW_WHITELIST |
| 292 | }; |
| 293 | static const char *whitelist_ro[] = { |
| 294 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 295 | }; |
| 296 | const char **p; |
| 297 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 298 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 299 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 300 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 301 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 302 | for (p = whitelist_rw; *p; p++) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 303 | if (!strcmp(drv->format_name, *p)) { |
| 304 | return 1; |
| 305 | } |
| 306 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 307 | if (read_only) { |
| 308 | for (p = whitelist_ro; *p; p++) { |
| 309 | if (!strcmp(drv->format_name, *p)) { |
| 310 | return 1; |
| 311 | } |
| 312 | } |
| 313 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 314 | return 0; |
| 315 | } |
| 316 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 317 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
| 318 | bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 319 | { |
| 320 | BlockDriver *drv = bdrv_find_format(format_name); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 321 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 322 | } |
| 323 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 324 | typedef struct CreateCo { |
| 325 | BlockDriver *drv; |
| 326 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 327 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 328 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 329 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 330 | } CreateCo; |
| 331 | |
| 332 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 333 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 334 | Error *local_err = NULL; |
| 335 | int ret; |
| 336 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 337 | CreateCo *cco = opaque; |
| 338 | assert(cco->drv); |
| 339 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 340 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 341 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 342 | error_propagate(&cco->err, local_err); |
| 343 | } |
| 344 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 345 | } |
| 346 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 347 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 348 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 349 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 350 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 351 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 352 | Coroutine *co; |
| 353 | CreateCo cco = { |
| 354 | .drv = drv, |
| 355 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 356 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 357 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 358 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 359 | }; |
| 360 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 361 | if (!drv->bdrv_create) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 362 | 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] | 363 | ret = -ENOTSUP; |
| 364 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | if (qemu_in_coroutine()) { |
| 368 | /* Fast-path if already in coroutine context */ |
| 369 | bdrv_create_co_entry(&cco); |
| 370 | } else { |
| 371 | co = qemu_coroutine_create(bdrv_create_co_entry); |
| 372 | qemu_coroutine_enter(co, &cco); |
| 373 | while (cco.ret == NOT_DONE) { |
Paolo Bonzini | b47ec2c | 2014-07-07 15:18:01 +0200 | [diff] [blame] | 374 | aio_poll(qemu_get_aio_context(), true); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 375 | } |
| 376 | } |
| 377 | |
| 378 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 379 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 380 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 381 | error_propagate(errp, cco.err); |
| 382 | } else { |
| 383 | error_setg_errno(errp, -ret, "Could not create image"); |
| 384 | } |
| 385 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 386 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 387 | out: |
| 388 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 389 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 390 | } |
| 391 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 392 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 393 | { |
| 394 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 395 | Error *local_err = NULL; |
| 396 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 397 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 398 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 399 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 400 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 403 | ret = bdrv_create(drv, filename, opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 404 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 405 | error_propagate(errp, local_err); |
| 406 | } |
| 407 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 408 | } |
| 409 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 410 | /** |
| 411 | * Try to get @bs's logical and physical block size. |
| 412 | * On success, store them in @bsz struct and return 0. |
| 413 | * On failure return -errno. |
| 414 | * @bs must not be empty. |
| 415 | */ |
| 416 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 417 | { |
| 418 | BlockDriver *drv = bs->drv; |
| 419 | |
| 420 | if (drv && drv->bdrv_probe_blocksizes) { |
| 421 | return drv->bdrv_probe_blocksizes(bs, bsz); |
| 422 | } |
| 423 | |
| 424 | return -ENOTSUP; |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 429 | * On success, store them in @geo struct and return 0. |
| 430 | * On failure return -errno. |
| 431 | * @bs must not be empty. |
| 432 | */ |
| 433 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 434 | { |
| 435 | BlockDriver *drv = bs->drv; |
| 436 | |
| 437 | if (drv && drv->bdrv_probe_geometry) { |
| 438 | return drv->bdrv_probe_geometry(bs, geo); |
| 439 | } |
| 440 | |
| 441 | return -ENOTSUP; |
| 442 | } |
| 443 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 444 | /* |
| 445 | * Create a uniquely-named empty temporary file. |
| 446 | * Return 0 upon success, otherwise a negative errno value. |
| 447 | */ |
| 448 | int get_tmp_filename(char *filename, int size) |
| 449 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 450 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 451 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 452 | /* GetTempFileName requires that its output buffer (4th param) |
| 453 | have length MAX_PATH or greater. */ |
| 454 | assert(size >= MAX_PATH); |
| 455 | return (GetTempPath(MAX_PATH, temp_dir) |
| 456 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 457 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 458 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 459 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 460 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 461 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 462 | if (!tmpdir) { |
| 463 | tmpdir = "/var/tmp"; |
| 464 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 465 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 466 | return -EOVERFLOW; |
| 467 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 468 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 469 | if (fd < 0) { |
| 470 | return -errno; |
| 471 | } |
| 472 | if (close(fd) != 0) { |
| 473 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 474 | return -errno; |
| 475 | } |
| 476 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 477 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 478 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 479 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 480 | /* |
| 481 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 482 | * recognized as a host CDROM. |
| 483 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 484 | static BlockDriver *find_hdev_driver(const char *filename) |
| 485 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 486 | int score_max = 0, score; |
| 487 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 488 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 489 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 490 | if (d->bdrv_probe_device) { |
| 491 | score = d->bdrv_probe_device(filename); |
| 492 | if (score > score_max) { |
| 493 | score_max = score; |
| 494 | drv = d; |
| 495 | } |
| 496 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 497 | } |
| 498 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 499 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 500 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 501 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 502 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 503 | bool allow_protocol_prefix, |
| 504 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 505 | { |
| 506 | BlockDriver *drv1; |
| 507 | char protocol[128]; |
| 508 | int len; |
| 509 | const char *p; |
| 510 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 511 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 512 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 513 | /* |
| 514 | * XXX(hch): we really should not let host device detection |
| 515 | * override an explicit protocol specification, but moving this |
| 516 | * later breaks access to device names with colons in them. |
| 517 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 518 | * based Linux systems those actually are quite common. |
| 519 | */ |
| 520 | drv1 = find_hdev_driver(filename); |
| 521 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 522 | return drv1; |
| 523 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 524 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 525 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 526 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 527 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 528 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 529 | p = strchr(filename, ':'); |
| 530 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 531 | len = p - filename; |
| 532 | if (len > sizeof(protocol) - 1) |
| 533 | len = sizeof(protocol) - 1; |
| 534 | memcpy(protocol, filename, len); |
| 535 | protocol[len] = '\0'; |
| 536 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 537 | if (drv1->protocol_name && |
| 538 | !strcmp(drv1->protocol_name, protocol)) { |
| 539 | return drv1; |
| 540 | } |
| 541 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 542 | |
| 543 | error_setg(errp, "Unknown protocol '%s'", protocol); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 544 | return NULL; |
| 545 | } |
| 546 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 547 | /* |
| 548 | * Guess image format by probing its contents. |
| 549 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 550 | * we do it anyway for backward compatibility. |
| 551 | * |
| 552 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 553 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 554 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 555 | * @filename is its filename. |
| 556 | * |
| 557 | * For all block drivers, call the bdrv_probe() method to get its |
| 558 | * probing score. |
| 559 | * Return the first block driver with the highest probing score. |
| 560 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 561 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 562 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 563 | { |
| 564 | int score_max = 0, score; |
| 565 | BlockDriver *drv = NULL, *d; |
| 566 | |
| 567 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 568 | if (d->bdrv_probe) { |
| 569 | score = d->bdrv_probe(buf, buf_size, filename); |
| 570 | if (score > score_max) { |
| 571 | score_max = score; |
| 572 | drv = d; |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | return drv; |
| 578 | } |
| 579 | |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 580 | static int find_image_format(BlockDriverState *bs, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 581 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 582 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 583 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 584 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 585 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 586 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 587 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 588 | if (bdrv_is_sg(bs) || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 589 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 590 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 591 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 592 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 593 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 594 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 595 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 596 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 597 | *pdrv = NULL; |
| 598 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 599 | } |
| 600 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 601 | drv = bdrv_probe_all(buf, ret, filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 602 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 603 | error_setg(errp, "Could not determine image format: No compatible " |
| 604 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 605 | ret = -ENOENT; |
| 606 | } |
| 607 | *pdrv = drv; |
| 608 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 609 | } |
| 610 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 611 | /** |
| 612 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 613 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 614 | */ |
| 615 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 616 | { |
| 617 | BlockDriver *drv = bs->drv; |
| 618 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 619 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 620 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 621 | return 0; |
| 622 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 623 | /* query actual device if possible, otherwise just trust the hint */ |
| 624 | if (drv->bdrv_getlength) { |
| 625 | int64_t length = drv->bdrv_getlength(bs); |
| 626 | if (length < 0) { |
| 627 | return length; |
| 628 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 629 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | bs->total_sectors = hint; |
| 633 | return 0; |
| 634 | } |
| 635 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 636 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 637 | * Set open flags for a given discard mode |
| 638 | * |
| 639 | * Return 0 on success, -1 if the discard mode was invalid. |
| 640 | */ |
| 641 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 642 | { |
| 643 | *flags &= ~BDRV_O_UNMAP; |
| 644 | |
| 645 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 646 | /* do nothing */ |
| 647 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 648 | *flags |= BDRV_O_UNMAP; |
| 649 | } else { |
| 650 | return -1; |
| 651 | } |
| 652 | |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 657 | * Set open flags for a given cache mode |
| 658 | * |
| 659 | * Return 0 on success, -1 if the cache mode was invalid. |
| 660 | */ |
| 661 | int bdrv_parse_cache_flags(const char *mode, int *flags) |
| 662 | { |
| 663 | *flags &= ~BDRV_O_CACHE_MASK; |
| 664 | |
| 665 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
| 666 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 667 | } else if (!strcmp(mode, "directsync")) { |
| 668 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 669 | } else if (!strcmp(mode, "writeback")) { |
| 670 | *flags |= BDRV_O_CACHE_WB; |
| 671 | } else if (!strcmp(mode, "unsafe")) { |
| 672 | *flags |= BDRV_O_CACHE_WB; |
| 673 | *flags |= BDRV_O_NO_FLUSH; |
| 674 | } else if (!strcmp(mode, "writethrough")) { |
| 675 | /* this is the default */ |
| 676 | } else { |
| 677 | return -1; |
| 678 | } |
| 679 | |
| 680 | return 0; |
| 681 | } |
| 682 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 683 | /* |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 684 | * Returns the flags that a temporary snapshot should get, based on the |
| 685 | * originally requested flags (the originally requested image will have flags |
| 686 | * like a backing file) |
| 687 | */ |
| 688 | static int bdrv_temp_snapshot_flags(int flags) |
| 689 | { |
| 690 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 691 | } |
| 692 | |
| 693 | /* |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 694 | * Returns the flags that bs->file should get if a protocol driver is expected, |
| 695 | * based on the given flags for the parent BDS |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 696 | */ |
| 697 | static int bdrv_inherited_flags(int flags) |
| 698 | { |
| 699 | /* Enable protocol handling, disable format probing for bs->file */ |
| 700 | flags |= BDRV_O_PROTOCOL; |
| 701 | |
| 702 | /* Our block drivers take care to send flushes and respect unmap policy, |
| 703 | * so we can enable both unconditionally on lower layers. */ |
| 704 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; |
| 705 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 706 | /* Clear flags that only apply to the top layer */ |
Kevin Wolf | 5669b44 | 2014-04-11 21:36:45 +0200 | [diff] [blame] | 707 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 708 | |
| 709 | return flags; |
| 710 | } |
| 711 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 712 | const BdrvChildRole child_file = { |
| 713 | .inherit_flags = bdrv_inherited_flags, |
| 714 | }; |
| 715 | |
| 716 | /* |
| 717 | * Returns the flags that bs->file should get if the use of formats (and not |
| 718 | * only protocols) is permitted for it, based on the given flags for the parent |
| 719 | * BDS |
| 720 | */ |
| 721 | static int bdrv_inherited_fmt_flags(int parent_flags) |
| 722 | { |
| 723 | int flags = child_file.inherit_flags(parent_flags); |
| 724 | return flags & ~BDRV_O_PROTOCOL; |
| 725 | } |
| 726 | |
| 727 | const BdrvChildRole child_format = { |
| 728 | .inherit_flags = bdrv_inherited_fmt_flags, |
| 729 | }; |
| 730 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 731 | /* |
| 732 | * Returns the flags that bs->backing_hd should get, based on the given flags |
| 733 | * for the parent BDS |
| 734 | */ |
| 735 | static int bdrv_backing_flags(int flags) |
| 736 | { |
| 737 | /* backing files always opened read-only */ |
| 738 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); |
| 739 | |
| 740 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 741 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 742 | |
| 743 | return flags; |
| 744 | } |
| 745 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 746 | static const BdrvChildRole child_backing = { |
| 747 | .inherit_flags = bdrv_backing_flags, |
| 748 | }; |
| 749 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 750 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 751 | { |
| 752 | int open_flags = flags | BDRV_O_CACHE_WB; |
| 753 | |
| 754 | /* |
| 755 | * Clear flags that are internal to the block layer before opening the |
| 756 | * image. |
| 757 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 758 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 759 | |
| 760 | /* |
| 761 | * Snapshots should be writable. |
| 762 | */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 763 | if (flags & BDRV_O_TEMPORARY) { |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 764 | open_flags |= BDRV_O_RDWR; |
| 765 | } |
| 766 | |
| 767 | return open_flags; |
| 768 | } |
| 769 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 770 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 771 | const char *node_name, |
| 772 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 773 | { |
| 774 | if (!node_name) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 775 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 776 | } |
| 777 | |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 778 | /* Check for empty string or invalid characters */ |
Markus Armbruster | f5bebbb | 2014-09-30 13:59:30 +0200 | [diff] [blame] | 779 | if (!id_wellformed(node_name)) { |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 780 | error_setg(errp, "Invalid node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 781 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 782 | } |
| 783 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 784 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 785 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 786 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 787 | node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 788 | return; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 789 | } |
| 790 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 791 | /* takes care of avoiding duplicates node names */ |
| 792 | if (bdrv_find_node(node_name)) { |
| 793 | error_setg(errp, "Duplicate node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 794 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | /* copy node name into the bs and insert it into the graph list */ |
| 798 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 799 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 800 | } |
| 801 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 802 | static QemuOptsList bdrv_runtime_opts = { |
| 803 | .name = "bdrv_common", |
| 804 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 805 | .desc = { |
| 806 | { |
| 807 | .name = "node-name", |
| 808 | .type = QEMU_OPT_STRING, |
| 809 | .help = "Node name of the block device node", |
| 810 | }, |
| 811 | { /* end of list */ } |
| 812 | }, |
| 813 | }; |
| 814 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 815 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 816 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 817 | * |
| 818 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 819 | */ |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 820 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 821 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 822 | { |
| 823 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 824 | const char *filename; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 825 | const char *node_name = NULL; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 826 | QemuOpts *opts; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 827 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 828 | |
| 829 | assert(drv != NULL); |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 830 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 831 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 832 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 833 | if (file != NULL) { |
| 834 | filename = file->filename; |
| 835 | } else { |
| 836 | filename = qdict_get_try_str(options, "filename"); |
| 837 | } |
| 838 | |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 839 | if (drv->bdrv_needs_filename && !filename) { |
| 840 | error_setg(errp, "The '%s' block driver requires a file name", |
| 841 | drv->format_name); |
| 842 | return -EINVAL; |
| 843 | } |
| 844 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 845 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
Stefan Hajnoczi | 28dcee1 | 2011-09-22 20:14:12 +0100 | [diff] [blame] | 846 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 847 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 848 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 849 | if (local_err) { |
| 850 | error_propagate(errp, local_err); |
| 851 | ret = -EINVAL; |
| 852 | goto fail_opts; |
| 853 | } |
| 854 | |
| 855 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 856 | bdrv_assign_node_name(bs, node_name, &local_err); |
Markus Armbruster | 0fb6395 | 2014-04-25 16:50:31 +0200 | [diff] [blame] | 857 | if (local_err) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 858 | error_propagate(errp, local_err); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 859 | ret = -EINVAL; |
| 860 | goto fail_opts; |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 861 | } |
| 862 | |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 863 | bs->guest_block_size = 512; |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 864 | bs->request_alignment = 512; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 865 | bs->zero_beyond_eof = true; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 866 | open_flags = bdrv_open_flags(bs, flags); |
| 867 | bs->read_only = !(open_flags & BDRV_O_RDWR); |
| 868 | |
| 869 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8f94a6e | 2013-10-10 11:45:55 +0200 | [diff] [blame] | 870 | error_setg(errp, |
| 871 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 872 | ? "Driver '%s' can only be used for read-only devices" |
| 873 | : "Driver '%s' is not whitelisted", |
| 874 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 875 | ret = -ENOTSUP; |
| 876 | goto fail_opts; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 877 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 878 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 879 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 880 | if (flags & BDRV_O_COPY_ON_READ) { |
| 881 | if (!bs->read_only) { |
| 882 | bdrv_enable_copy_on_read(bs); |
| 883 | } else { |
| 884 | 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] | 885 | ret = -EINVAL; |
| 886 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 887 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 888 | } |
| 889 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 890 | if (filename != NULL) { |
| 891 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 892 | } else { |
| 893 | bs->filename[0] = '\0'; |
| 894 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 895 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 896 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 897 | bs->drv = drv; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 898 | bs->opaque = g_malloc0(drv->instance_size); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 899 | |
Stefan Hajnoczi | 03f541b | 2011-10-27 10:54:28 +0100 | [diff] [blame] | 900 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
Stefan Hajnoczi | e7c6379 | 2011-10-27 10:54:27 +0100 | [diff] [blame] | 901 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 902 | /* Open the image, either directly or using a protocol */ |
| 903 | if (drv->bdrv_file_open) { |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 904 | assert(file == NULL); |
Benoît Canet | 030be32 | 2013-09-24 17:07:04 +0200 | [diff] [blame] | 905 | assert(!drv->bdrv_needs_filename || filename != NULL); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 906 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 907 | } else { |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 908 | if (file == NULL) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 909 | error_setg(errp, "Can't use '%s' as a block driver for the " |
| 910 | "protocol level", drv->format_name); |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 911 | ret = -EINVAL; |
| 912 | goto free_and_fail; |
| 913 | } |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 914 | bs->file = file; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 915 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 916 | } |
| 917 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 918 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 919 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 920 | error_propagate(errp, local_err); |
Dunrong Huang | 2fa9aa5 | 2013-09-24 18:14:01 +0800 | [diff] [blame] | 921 | } else if (bs->filename[0]) { |
| 922 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 923 | } else { |
| 924 | error_setg_errno(errp, -ret, "Could not open image"); |
| 925 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 926 | goto free_and_fail; |
| 927 | } |
| 928 | |
Markus Armbruster | a1f688f | 2015-03-13 21:09:40 +0100 | [diff] [blame] | 929 | if (bs->encrypted) { |
| 930 | error_report("Encrypted images are deprecated"); |
| 931 | error_printf("Support for them will be removed in a future release.\n" |
| 932 | "You can use 'qemu-img convert' to convert your image" |
| 933 | " to an unencrypted one.\n"); |
| 934 | } |
| 935 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 936 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 937 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 938 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 939 | goto free_and_fail; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 940 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 941 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 942 | bdrv_refresh_limits(bs, &local_err); |
| 943 | if (local_err) { |
| 944 | error_propagate(errp, local_err); |
| 945 | ret = -EINVAL; |
| 946 | goto free_and_fail; |
| 947 | } |
| 948 | |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 949 | assert(bdrv_opt_mem_align(bs) != 0); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 950 | assert(bdrv_min_mem_align(bs) != 0); |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 951 | assert((bs->request_alignment != 0) || bdrv_is_sg(bs)); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 952 | |
| 953 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 954 | return 0; |
| 955 | |
| 956 | free_and_fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 957 | bs->file = NULL; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 958 | g_free(bs->opaque); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 959 | bs->opaque = NULL; |
| 960 | bs->drv = NULL; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 961 | fail_opts: |
| 962 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 963 | return ret; |
| 964 | } |
| 965 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 966 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 967 | { |
| 968 | QObject *options_obj; |
| 969 | QDict *options; |
| 970 | int ret; |
| 971 | |
| 972 | ret = strstart(filename, "json:", &filename); |
| 973 | assert(ret); |
| 974 | |
| 975 | options_obj = qobject_from_json(filename); |
| 976 | if (!options_obj) { |
| 977 | error_setg(errp, "Could not parse the JSON options"); |
| 978 | return NULL; |
| 979 | } |
| 980 | |
| 981 | if (qobject_type(options_obj) != QTYPE_QDICT) { |
| 982 | qobject_decref(options_obj); |
| 983 | error_setg(errp, "Invalid JSON object given"); |
| 984 | return NULL; |
| 985 | } |
| 986 | |
| 987 | options = qobject_to_qdict(options_obj); |
| 988 | qdict_flatten(options); |
| 989 | |
| 990 | return options; |
| 991 | } |
| 992 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 993 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 994 | * Fills in default options for opening images and converts the legacy |
| 995 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 996 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 997 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 998 | */ |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 999 | static int bdrv_fill_options(QDict **options, const char **pfilename, |
| 1000 | int *flags, BlockDriver *drv, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1001 | { |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1002 | const char *filename = *pfilename; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1003 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1004 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1005 | bool parse_filename = false; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1006 | BlockDriver *tmp_drv; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1007 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1008 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1009 | /* Parse json: pseudo-protocol */ |
| 1010 | if (filename && g_str_has_prefix(filename, "json:")) { |
| 1011 | QDict *json_options = parse_json_filename(filename, &local_err); |
| 1012 | if (local_err) { |
| 1013 | error_propagate(errp, local_err); |
| 1014 | return -EINVAL; |
| 1015 | } |
| 1016 | |
| 1017 | /* Options given in the filename have lower priority than options |
| 1018 | * specified directly */ |
| 1019 | qdict_join(*options, json_options, false); |
| 1020 | QDECREF(json_options); |
| 1021 | *pfilename = filename = NULL; |
| 1022 | } |
| 1023 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1024 | drvname = qdict_get_try_str(*options, "driver"); |
| 1025 | |
| 1026 | /* If the user has explicitly specified the driver, this choice should |
| 1027 | * override the BDRV_O_PROTOCOL flag */ |
| 1028 | tmp_drv = drv; |
| 1029 | if (!tmp_drv && drvname) { |
| 1030 | tmp_drv = bdrv_find_format(drvname); |
| 1031 | } |
| 1032 | if (tmp_drv) { |
| 1033 | protocol = tmp_drv->bdrv_file_open; |
| 1034 | } |
| 1035 | |
| 1036 | if (protocol) { |
| 1037 | *flags |= BDRV_O_PROTOCOL; |
| 1038 | } else { |
| 1039 | *flags &= ~BDRV_O_PROTOCOL; |
| 1040 | } |
| 1041 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1042 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1043 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1044 | if (!qdict_haskey(*options, "filename")) { |
| 1045 | qdict_put(*options, "filename", qstring_from_str(filename)); |
| 1046 | parse_filename = true; |
| 1047 | } else { |
| 1048 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1049 | "the same time"); |
| 1050 | return -EINVAL; |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | /* Find the right block driver */ |
| 1055 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1056 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1057 | if (drv) { |
| 1058 | if (drvname) { |
| 1059 | error_setg(errp, "Driver specified twice"); |
| 1060 | return -EINVAL; |
| 1061 | } |
| 1062 | drvname = drv->format_name; |
| 1063 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1064 | } else { |
| 1065 | if (!drvname && protocol) { |
| 1066 | if (filename) { |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 1067 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1068 | if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1069 | return -EINVAL; |
| 1070 | } |
| 1071 | |
| 1072 | drvname = drv->format_name; |
| 1073 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1074 | } else { |
| 1075 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1076 | return -EINVAL; |
| 1077 | } |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1078 | } else if (drvname) { |
| 1079 | drv = bdrv_find_format(drvname); |
| 1080 | if (!drv) { |
| 1081 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1082 | return -ENOENT; |
| 1083 | } |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1084 | } |
| 1085 | } |
| 1086 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1087 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1088 | |
| 1089 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1090 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1091 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1092 | if (local_err) { |
| 1093 | error_propagate(errp, local_err); |
| 1094 | return -EINVAL; |
| 1095 | } |
| 1096 | |
| 1097 | if (!drv->bdrv_needs_filename) { |
| 1098 | qdict_del(*options, "filename"); |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1105 | static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 1106 | BlockDriverState *child_bs, |
| 1107 | const BdrvChildRole *child_role) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1108 | { |
| 1109 | BdrvChild *child = g_new(BdrvChild, 1); |
| 1110 | *child = (BdrvChild) { |
| 1111 | .bs = child_bs, |
| 1112 | .role = child_role, |
| 1113 | }; |
| 1114 | |
| 1115 | QLIST_INSERT_HEAD(&parent_bs->children, child, next); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1116 | |
| 1117 | return child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1118 | } |
| 1119 | |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1120 | static void bdrv_detach_child(BdrvChild *child) |
| 1121 | { |
| 1122 | QLIST_REMOVE(child, next); |
| 1123 | g_free(child); |
| 1124 | } |
| 1125 | |
| 1126 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 1127 | { |
| 1128 | BlockDriverState *child_bs = child->bs; |
| 1129 | |
| 1130 | if (child->bs->inherits_from == parent) { |
| 1131 | child->bs->inherits_from = NULL; |
| 1132 | } |
| 1133 | |
| 1134 | bdrv_detach_child(child); |
| 1135 | bdrv_unref(child_bs); |
| 1136 | } |
| 1137 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1138 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
| 1139 | { |
| 1140 | |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1141 | if (bs->backing_hd) { |
| 1142 | assert(bs->backing_blocker); |
| 1143 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); |
Kevin Wolf | 80a1e13 | 2015-06-17 15:52:09 +0200 | [diff] [blame] | 1144 | bdrv_detach_child(bs->backing_child); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1145 | } else if (backing_hd) { |
| 1146 | error_setg(&bs->backing_blocker, |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 1147 | "node is used as backing hd of '%s'", |
| 1148 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1149 | } |
| 1150 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1151 | bs->backing_hd = backing_hd; |
| 1152 | if (!backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1153 | error_free(bs->backing_blocker); |
| 1154 | bs->backing_blocker = NULL; |
Kevin Wolf | 80a1e13 | 2015-06-17 15:52:09 +0200 | [diff] [blame] | 1155 | bs->backing_child = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1156 | goto out; |
| 1157 | } |
Kevin Wolf | 80a1e13 | 2015-06-17 15:52:09 +0200 | [diff] [blame] | 1158 | bs->backing_child = bdrv_attach_child(bs, backing_hd, &child_backing); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1159 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
| 1160 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); |
| 1161 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), |
| 1162 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1163 | |
| 1164 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); |
| 1165 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ |
Fam Zheng | bb00021 | 2014-09-11 13:14:00 +0800 | [diff] [blame] | 1166 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1167 | bs->backing_blocker); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1168 | out: |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1169 | bdrv_refresh_limits(bs, NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1170 | } |
| 1171 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1172 | /* |
| 1173 | * Opens the backing file for a BlockDriverState if not yet open |
| 1174 | * |
| 1175 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1176 | * empty set of options. The reference to the QDict is transferred to this |
| 1177 | * function (even on failure), so if the caller intends to reuse the dictionary, |
| 1178 | * it needs to use QINCREF() before calling bdrv_file_open. |
| 1179 | */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1180 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1181 | { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1182 | char *backing_filename = g_malloc0(PATH_MAX); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1183 | int ret = 0; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1184 | BlockDriverState *backing_hd; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1185 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1186 | |
| 1187 | if (bs->backing_hd != NULL) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1188 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1189 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1190 | } |
| 1191 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1192 | /* NULL means an empty set of options */ |
| 1193 | if (options == NULL) { |
| 1194 | options = qdict_new(); |
| 1195 | } |
| 1196 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1197 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 1198 | if (qdict_haskey(options, "file.filename")) { |
| 1199 | backing_filename[0] = '\0'; |
| 1200 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1201 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1202 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 1203 | } else { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 1204 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
| 1205 | &local_err); |
| 1206 | if (local_err) { |
| 1207 | ret = -EINVAL; |
| 1208 | error_propagate(errp, local_err); |
| 1209 | QDECREF(options); |
| 1210 | goto free_exit; |
| 1211 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1212 | } |
| 1213 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 1214 | if (!bs->drv || !bs->drv->supports_backing) { |
| 1215 | ret = -EINVAL; |
| 1216 | error_setg(errp, "Driver doesn't support backing files"); |
| 1217 | QDECREF(options); |
| 1218 | goto free_exit; |
| 1219 | } |
| 1220 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1221 | backing_hd = bdrv_new(); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1222 | |
Kevin Wolf | c5f6e49 | 2014-11-25 18:12:42 +0100 | [diff] [blame] | 1223 | if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
| 1224 | qdict_put(options, "driver", qstring_from_str(bs->backing_format)); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1225 | } |
| 1226 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1227 | assert(bs->backing_hd == NULL); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1228 | ret = bdrv_open_inherit(&backing_hd, |
| 1229 | *backing_filename ? backing_filename : NULL, |
| 1230 | NULL, options, 0, bs, &child_backing, |
| 1231 | NULL, &local_err); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1232 | if (ret < 0) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1233 | bdrv_unref(backing_hd); |
| 1234 | backing_hd = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1235 | bs->open_flags |= BDRV_O_NO_BACKING; |
Fam Zheng | b04b6b6 | 2013-11-08 11:26:49 +0800 | [diff] [blame] | 1236 | error_setg(errp, "Could not open backing file: %s", |
| 1237 | error_get_pretty(local_err)); |
| 1238 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1239 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1240 | } |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1241 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1242 | bdrv_set_backing_hd(bs, backing_hd); |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 1243 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1244 | free_exit: |
| 1245 | g_free(backing_filename); |
| 1246 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1247 | } |
| 1248 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1249 | /* |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1250 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 1251 | * device's options. |
| 1252 | * |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1253 | * If allow_none is true, no image will be opened if filename is false and no |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1254 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1255 | * |
| 1256 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 1257 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 1258 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 1259 | * BlockdevRef. |
| 1260 | * |
| 1261 | * The BlockdevRef will be removed from the options QDict. |
| 1262 | */ |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1263 | BdrvChild *bdrv_open_child(const char *filename, |
| 1264 | QDict *options, const char *bdref_key, |
| 1265 | BlockDriverState* parent, |
| 1266 | const BdrvChildRole *child_role, |
| 1267 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1268 | { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1269 | BdrvChild *c = NULL; |
| 1270 | BlockDriverState *bs; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1271 | QDict *image_options; |
| 1272 | int ret; |
| 1273 | char *bdref_key_dot; |
| 1274 | const char *reference; |
| 1275 | |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1276 | assert(child_role != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1277 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1278 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 1279 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 1280 | g_free(bdref_key_dot); |
| 1281 | |
| 1282 | reference = qdict_get_try_str(options, bdref_key); |
| 1283 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1284 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1285 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 1286 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1287 | } |
Markus Armbruster | b20e61e | 2014-05-28 11:16:57 +0200 | [diff] [blame] | 1288 | QDECREF(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1289 | goto done; |
| 1290 | } |
| 1291 | |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1292 | bs = NULL; |
| 1293 | ret = bdrv_open_inherit(&bs, filename, reference, image_options, 0, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1294 | parent, child_role, NULL, errp); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1295 | if (ret < 0) { |
| 1296 | goto done; |
| 1297 | } |
| 1298 | |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1299 | c = bdrv_attach_child(parent, bs, child_role); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1300 | |
| 1301 | done: |
| 1302 | qdict_del(options, bdref_key); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1303 | return c; |
| 1304 | } |
| 1305 | |
| 1306 | /* |
| 1307 | * This is a version of bdrv_open_child() that returns 0/-EINVAL instead of |
| 1308 | * a BdrvChild object. |
| 1309 | * |
| 1310 | * If allow_none is true, no image will be opened if filename is false and no |
| 1311 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. |
| 1312 | * |
| 1313 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. |
| 1314 | */ |
| 1315 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, |
| 1316 | QDict *options, const char *bdref_key, |
| 1317 | BlockDriverState* parent, const BdrvChildRole *child_role, |
| 1318 | bool allow_none, Error **errp) |
| 1319 | { |
| 1320 | Error *local_err = NULL; |
| 1321 | BdrvChild *c; |
| 1322 | |
| 1323 | assert(pbs); |
| 1324 | assert(*pbs == NULL); |
| 1325 | |
| 1326 | c = bdrv_open_child(filename, options, bdref_key, parent, child_role, |
| 1327 | allow_none, &local_err); |
| 1328 | if (local_err) { |
| 1329 | error_propagate(errp, local_err); |
| 1330 | return -EINVAL; |
| 1331 | } |
| 1332 | |
| 1333 | if (c != NULL) { |
| 1334 | *pbs = c->bs; |
| 1335 | } |
| 1336 | |
| 1337 | return 0; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1338 | } |
| 1339 | |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1340 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1341 | { |
| 1342 | /* 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] | 1343 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1344 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1345 | QemuOpts *opts = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1346 | QDict *snapshot_options; |
| 1347 | BlockDriverState *bs_snapshot; |
Fam Zheng | c2e0dbb | 2015-07-06 12:24:44 +0800 | [diff] [blame] | 1348 | Error *local_err = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1349 | int ret; |
| 1350 | |
| 1351 | /* if snapshot, we create a temporary backing file and open it |
| 1352 | instead of opening 'filename' directly */ |
| 1353 | |
| 1354 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1355 | total_size = bdrv_getlength(bs); |
| 1356 | if (total_size < 0) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1357 | ret = total_size; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1358 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1359 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1360 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1361 | |
| 1362 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1363 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1364 | if (ret < 0) { |
| 1365 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1366 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1367 | } |
| 1368 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 1369 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1370 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 1371 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 1372 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1373 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1374 | if (ret < 0) { |
| 1375 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
| 1376 | "'%s': %s", tmp_filename, |
| 1377 | error_get_pretty(local_err)); |
| 1378 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1379 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1380 | } |
| 1381 | |
| 1382 | /* Prepare a new options QDict for the temporary file */ |
| 1383 | snapshot_options = qdict_new(); |
| 1384 | qdict_put(snapshot_options, "file.driver", |
| 1385 | qstring_from_str("file")); |
| 1386 | qdict_put(snapshot_options, "file.filename", |
| 1387 | qstring_from_str(tmp_filename)); |
| 1388 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1389 | bs_snapshot = bdrv_new(); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1390 | |
| 1391 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 1392 | flags, &bdrv_qcow2, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1393 | if (ret < 0) { |
| 1394 | error_propagate(errp, local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1395 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1396 | } |
| 1397 | |
| 1398 | bdrv_append(bs_snapshot, bs); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1399 | |
| 1400 | out: |
| 1401 | g_free(tmp_filename); |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1402 | return ret; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1403 | } |
| 1404 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1405 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1406 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1407 | * |
| 1408 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1409 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1410 | * after the call (even on failure), so if the caller intends to reuse the |
| 1411 | * dictionary, it needs to use QINCREF() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1412 | * |
| 1413 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 1414 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1415 | * |
| 1416 | * The reference parameter may be used to specify an existing block device which |
| 1417 | * should be opened. If specified, neither options nor a filename may be given, |
| 1418 | * 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] | 1419 | */ |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1420 | static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, |
| 1421 | const char *reference, QDict *options, int flags, |
| 1422 | BlockDriverState *parent, |
| 1423 | const BdrvChildRole *child_role, |
| 1424 | BlockDriver *drv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1425 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1426 | int ret; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1427 | BlockDriverState *file = NULL, *bs; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 1428 | const char *drvname; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1429 | Error *local_err = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1430 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 1431 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1432 | assert(pbs); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1433 | assert(!child_role || !flags); |
| 1434 | assert(!child_role == !parent); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1435 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1436 | if (reference) { |
| 1437 | bool options_non_empty = options ? qdict_size(options) : false; |
| 1438 | QDECREF(options); |
| 1439 | |
| 1440 | if (*pbs) { |
| 1441 | error_setg(errp, "Cannot reuse an existing BDS when referencing " |
| 1442 | "another block device"); |
| 1443 | return -EINVAL; |
| 1444 | } |
| 1445 | |
| 1446 | if (filename || options_non_empty) { |
| 1447 | error_setg(errp, "Cannot reference an existing block device with " |
| 1448 | "additional options or a new filename"); |
| 1449 | return -EINVAL; |
| 1450 | } |
| 1451 | |
| 1452 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 1453 | if (!bs) { |
| 1454 | return -ENODEV; |
| 1455 | } |
| 1456 | bdrv_ref(bs); |
| 1457 | *pbs = bs; |
| 1458 | return 0; |
| 1459 | } |
| 1460 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1461 | if (*pbs) { |
| 1462 | bs = *pbs; |
| 1463 | } else { |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1464 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1465 | } |
| 1466 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1467 | /* NULL means an empty set of options */ |
| 1468 | if (options == NULL) { |
| 1469 | options = qdict_new(); |
| 1470 | } |
| 1471 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1472 | if (child_role) { |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 1473 | bs->inherits_from = parent; |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1474 | flags = child_role->inherit_flags(parent->open_flags); |
| 1475 | } |
| 1476 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1477 | ret = bdrv_fill_options(&options, &filename, &flags, drv, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1478 | if (local_err) { |
| 1479 | goto fail; |
| 1480 | } |
| 1481 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1482 | /* Find the right image format driver */ |
| 1483 | drv = NULL; |
| 1484 | drvname = qdict_get_try_str(options, "driver"); |
| 1485 | if (drvname) { |
| 1486 | drv = bdrv_find_format(drvname); |
| 1487 | qdict_del(options, "driver"); |
| 1488 | if (!drv) { |
| 1489 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 1490 | ret = -EINVAL; |
| 1491 | goto fail; |
| 1492 | } |
| 1493 | } |
| 1494 | |
| 1495 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1496 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1497 | bs->open_flags = flags; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1498 | bs->options = options; |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1499 | options = qdict_clone_shallow(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1500 | |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1501 | /* Open image file without format layer */ |
| 1502 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
| 1503 | if (flags & BDRV_O_RDWR) { |
| 1504 | flags |= BDRV_O_ALLOW_RDWR; |
| 1505 | } |
| 1506 | if (flags & BDRV_O_SNAPSHOT) { |
| 1507 | snapshot_flags = bdrv_temp_snapshot_flags(flags); |
| 1508 | flags = bdrv_backing_flags(flags); |
| 1509 | } |
| 1510 | |
| 1511 | assert(file == NULL); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1512 | bs->open_flags = flags; |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1513 | ret = bdrv_open_image(&file, filename, options, "file", |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1514 | bs, &child_file, true, &local_err); |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1515 | if (ret < 0) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 1516 | goto fail; |
| 1517 | } |
| 1518 | } |
| 1519 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1520 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 1521 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1522 | if (!drv && file) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1523 | ret = find_image_format(file, filename, &drv, &local_err); |
| 1524 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1525 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1526 | } |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1527 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1528 | error_setg(errp, "Must specify either driver or file"); |
| 1529 | ret = -EINVAL; |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1530 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1531 | } |
| 1532 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1533 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 1534 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 1535 | /* file must be NULL if a protocol BDS is about to be created |
| 1536 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 1537 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 1538 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1539 | /* Open the image */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1540 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1541 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1542 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 1543 | } |
| 1544 | |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1545 | if (file && (bs->file != file)) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1546 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1547 | file = NULL; |
| 1548 | } |
| 1549 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1550 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1551 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1552 | QDict *backing_options; |
| 1553 | |
Benoît Canet | 5726d87 | 2013-09-25 13:30:01 +0200 | [diff] [blame] | 1554 | qdict_extract_subqdict(options, &backing_options, "backing."); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1555 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1556 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1557 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1558 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1559 | } |
| 1560 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1561 | bdrv_refresh_filename(bs); |
| 1562 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1563 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 1564 | * temporary snapshot afterwards. */ |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1565 | if (snapshot_flags) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1566 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1567 | if (local_err) { |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1568 | goto close_and_fail; |
| 1569 | } |
| 1570 | } |
| 1571 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1572 | /* Check if any unknown options were used */ |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1573 | if (options && (qdict_size(options) != 0)) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1574 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1575 | if (flags & BDRV_O_PROTOCOL) { |
| 1576 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 1577 | "'%s'", drv->format_name, entry->key); |
| 1578 | } else { |
| 1579 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
| 1580 | "support the option '%s'", drv->format_name, |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1581 | bdrv_get_device_name(bs), entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1582 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1583 | |
| 1584 | ret = -EINVAL; |
| 1585 | goto close_and_fail; |
| 1586 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1587 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1588 | if (!bdrv_key_required(bs)) { |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 1589 | if (bs->blk) { |
| 1590 | blk_dev_change_media_cb(bs->blk, true); |
| 1591 | } |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1592 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
| 1593 | && !runstate_check(RUN_STATE_INMIGRATE) |
| 1594 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ |
| 1595 | error_setg(errp, |
| 1596 | "Guest must be stopped for opening of encrypted image"); |
| 1597 | ret = -EBUSY; |
| 1598 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1599 | } |
| 1600 | |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1601 | QDECREF(options); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1602 | *pbs = bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1603 | return 0; |
| 1604 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1605 | fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1606 | if (file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1607 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1608 | } |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1609 | QDECREF(bs->options); |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1610 | QDECREF(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1611 | bs->options = NULL; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1612 | if (!*pbs) { |
| 1613 | /* If *pbs is NULL, a new BDS has been created in this function and |
| 1614 | needs to be freed now. Otherwise, it does not need to be closed, |
| 1615 | since it has not really been opened yet. */ |
| 1616 | bdrv_unref(bs); |
| 1617 | } |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1618 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1619 | error_propagate(errp, local_err); |
| 1620 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1621 | return ret; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1622 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1623 | close_and_fail: |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1624 | /* See fail path, but now the BDS has to be always closed */ |
| 1625 | if (*pbs) { |
| 1626 | bdrv_close(bs); |
| 1627 | } else { |
| 1628 | bdrv_unref(bs); |
| 1629 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1630 | QDECREF(options); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1631 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1632 | error_propagate(errp, local_err); |
| 1633 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1634 | return ret; |
| 1635 | } |
| 1636 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1637 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
| 1638 | const char *reference, QDict *options, int flags, |
| 1639 | BlockDriver *drv, Error **errp) |
| 1640 | { |
| 1641 | return bdrv_open_inherit(pbs, filename, reference, options, flags, NULL, |
| 1642 | NULL, drv, errp); |
| 1643 | } |
| 1644 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1645 | typedef struct BlockReopenQueueEntry { |
| 1646 | bool prepared; |
| 1647 | BDRVReopenState state; |
| 1648 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1649 | } BlockReopenQueueEntry; |
| 1650 | |
| 1651 | /* |
| 1652 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 1653 | * reopen of multiple devices. |
| 1654 | * |
| 1655 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 1656 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 1657 | * be created and initialized. This newly created BlockReopenQueue should be |
| 1658 | * passed back in for subsequent calls that are intended to be of the same |
| 1659 | * atomic 'set'. |
| 1660 | * |
| 1661 | * bs is the BlockDriverState to add to the reopen queue. |
| 1662 | * |
| 1663 | * flags contains the open flags for the associated bs |
| 1664 | * |
| 1665 | * returns a pointer to bs_queue, which is either the newly allocated |
| 1666 | * bs_queue, or the existing bs_queue being used. |
| 1667 | * |
| 1668 | */ |
| 1669 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 1670 | BlockDriverState *bs, int flags) |
| 1671 | { |
| 1672 | assert(bs != NULL); |
| 1673 | |
| 1674 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1675 | BdrvChild *child; |
| 1676 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1677 | if (bs_queue == NULL) { |
| 1678 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 1679 | QSIMPLEQ_INIT(bs_queue); |
| 1680 | } |
| 1681 | |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1682 | /* bdrv_open() masks this flag out */ |
| 1683 | flags &= ~BDRV_O_PROTOCOL; |
| 1684 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1685 | QLIST_FOREACH(child, &bs->children, next) { |
| 1686 | int child_flags; |
| 1687 | |
| 1688 | if (child->bs->inherits_from != bs) { |
| 1689 | continue; |
| 1690 | } |
| 1691 | |
| 1692 | child_flags = child->role->inherit_flags(flags); |
| 1693 | bdrv_reopen_queue(bs_queue, child->bs, child_flags); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1694 | } |
| 1695 | |
| 1696 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 1697 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 1698 | |
| 1699 | bs_entry->state.bs = bs; |
| 1700 | bs_entry->state.flags = flags; |
| 1701 | |
| 1702 | return bs_queue; |
| 1703 | } |
| 1704 | |
| 1705 | /* |
| 1706 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 1707 | * |
| 1708 | * The queue passed in (bs_queue) must have been built up previous |
| 1709 | * via bdrv_reopen_queue(). |
| 1710 | * |
| 1711 | * Reopens all BDS specified in the queue, with the appropriate |
| 1712 | * flags. All devices are prepared for reopen, and failure of any |
| 1713 | * device will cause all device changes to be abandonded, and intermediate |
| 1714 | * data cleaned up. |
| 1715 | * |
| 1716 | * If all devices prepare successfully, then the changes are committed |
| 1717 | * to all devices. |
| 1718 | * |
| 1719 | */ |
| 1720 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
| 1721 | { |
| 1722 | int ret = -1; |
| 1723 | BlockReopenQueueEntry *bs_entry, *next; |
| 1724 | Error *local_err = NULL; |
| 1725 | |
| 1726 | assert(bs_queue != NULL); |
| 1727 | |
| 1728 | bdrv_drain_all(); |
| 1729 | |
| 1730 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1731 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { |
| 1732 | error_propagate(errp, local_err); |
| 1733 | goto cleanup; |
| 1734 | } |
| 1735 | bs_entry->prepared = true; |
| 1736 | } |
| 1737 | |
| 1738 | /* If we reach this point, we have success and just need to apply the |
| 1739 | * changes |
| 1740 | */ |
| 1741 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1742 | bdrv_reopen_commit(&bs_entry->state); |
| 1743 | } |
| 1744 | |
| 1745 | ret = 0; |
| 1746 | |
| 1747 | cleanup: |
| 1748 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 1749 | if (ret && bs_entry->prepared) { |
| 1750 | bdrv_reopen_abort(&bs_entry->state); |
| 1751 | } |
| 1752 | g_free(bs_entry); |
| 1753 | } |
| 1754 | g_free(bs_queue); |
| 1755 | return ret; |
| 1756 | } |
| 1757 | |
| 1758 | |
| 1759 | /* Reopen a single BlockDriverState with the specified flags. */ |
| 1760 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) |
| 1761 | { |
| 1762 | int ret = -1; |
| 1763 | Error *local_err = NULL; |
| 1764 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); |
| 1765 | |
| 1766 | ret = bdrv_reopen_multiple(queue, &local_err); |
| 1767 | if (local_err != NULL) { |
| 1768 | error_propagate(errp, local_err); |
| 1769 | } |
| 1770 | return ret; |
| 1771 | } |
| 1772 | |
| 1773 | |
| 1774 | /* |
| 1775 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 1776 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 1777 | * the block driver layer .bdrv_reopen_prepare() |
| 1778 | * |
| 1779 | * bs is the BlockDriverState to reopen |
| 1780 | * flags are the new open flags |
| 1781 | * queue is the reopen queue |
| 1782 | * |
| 1783 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 1784 | * as well. |
| 1785 | * |
| 1786 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 1787 | * It is the responsibility of the caller to then call the abort() or |
| 1788 | * commit() for any other BDS that have been left in a prepare() state |
| 1789 | * |
| 1790 | */ |
| 1791 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 1792 | Error **errp) |
| 1793 | { |
| 1794 | int ret = -1; |
| 1795 | Error *local_err = NULL; |
| 1796 | BlockDriver *drv; |
| 1797 | |
| 1798 | assert(reopen_state != NULL); |
| 1799 | assert(reopen_state->bs->drv != NULL); |
| 1800 | drv = reopen_state->bs->drv; |
| 1801 | |
| 1802 | /* if we are to stay read-only, do not allow permission change |
| 1803 | * to r/w */ |
| 1804 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 1805 | reopen_state->flags & BDRV_O_RDWR) { |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 1806 | error_setg(errp, "Node '%s' is read only", |
| 1807 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1808 | goto error; |
| 1809 | } |
| 1810 | |
| 1811 | |
| 1812 | ret = bdrv_flush(reopen_state->bs); |
| 1813 | if (ret) { |
| 1814 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", |
| 1815 | strerror(-ret)); |
| 1816 | goto error; |
| 1817 | } |
| 1818 | |
| 1819 | if (drv->bdrv_reopen_prepare) { |
| 1820 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 1821 | if (ret) { |
| 1822 | if (local_err != NULL) { |
| 1823 | error_propagate(errp, local_err); |
| 1824 | } else { |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 1825 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 1826 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1827 | } |
| 1828 | goto error; |
| 1829 | } |
| 1830 | } else { |
| 1831 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 1832 | * handler for each supported drv. */ |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 1833 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 1834 | "does not support reopening files", drv->format_name, |
| 1835 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1836 | ret = -1; |
| 1837 | goto error; |
| 1838 | } |
| 1839 | |
| 1840 | ret = 0; |
| 1841 | |
| 1842 | error: |
| 1843 | return ret; |
| 1844 | } |
| 1845 | |
| 1846 | /* |
| 1847 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 1848 | * makes them final by swapping the staging BlockDriverState contents into |
| 1849 | * the active BlockDriverState contents. |
| 1850 | */ |
| 1851 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 1852 | { |
| 1853 | BlockDriver *drv; |
| 1854 | |
| 1855 | assert(reopen_state != NULL); |
| 1856 | drv = reopen_state->bs->drv; |
| 1857 | assert(drv != NULL); |
| 1858 | |
| 1859 | /* If there are any driver level actions to take */ |
| 1860 | if (drv->bdrv_reopen_commit) { |
| 1861 | drv->bdrv_reopen_commit(reopen_state); |
| 1862 | } |
| 1863 | |
| 1864 | /* set BDS specific flags now */ |
| 1865 | reopen_state->bs->open_flags = reopen_state->flags; |
| 1866 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & |
| 1867 | BDRV_O_CACHE_WB); |
| 1868 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 1869 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1870 | bdrv_refresh_limits(reopen_state->bs, NULL); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1871 | } |
| 1872 | |
| 1873 | /* |
| 1874 | * Abort the reopen, and delete and free the staged changes in |
| 1875 | * reopen_state |
| 1876 | */ |
| 1877 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 1878 | { |
| 1879 | BlockDriver *drv; |
| 1880 | |
| 1881 | assert(reopen_state != NULL); |
| 1882 | drv = reopen_state->bs->drv; |
| 1883 | assert(drv != NULL); |
| 1884 | |
| 1885 | if (drv->bdrv_reopen_abort) { |
| 1886 | drv->bdrv_reopen_abort(reopen_state); |
| 1887 | } |
| 1888 | } |
| 1889 | |
| 1890 | |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1891 | void bdrv_close(BlockDriverState *bs) |
| 1892 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 1893 | BdrvAioNotifier *ban, *ban_next; |
| 1894 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1895 | if (bs->job) { |
| 1896 | block_job_cancel_sync(bs->job); |
| 1897 | } |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 1898 | bdrv_drain(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 1899 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 1900 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 1901 | notifier_list_notify(&bs->close_notifiers, bs); |
Kevin Wolf | 7094f12 | 2012-04-11 11:06:37 +0200 | [diff] [blame] | 1902 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1903 | if (bs->drv) { |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 1904 | BdrvChild *child, *next; |
| 1905 | |
Kevin Wolf | 9a7dedb | 2015-06-16 10:58:20 +0200 | [diff] [blame] | 1906 | bs->drv->bdrv_close(bs); |
| 1907 | |
| 1908 | if (bs->backing_hd) { |
| 1909 | BlockDriverState *backing_hd = bs->backing_hd; |
| 1910 | bdrv_set_backing_hd(bs, NULL); |
| 1911 | bdrv_unref(backing_hd); |
| 1912 | } |
| 1913 | |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 1914 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1915 | /* TODO Remove bdrv_unref() from drivers' close function and use |
| 1916 | * bdrv_unref_child() here */ |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 1917 | if (child->bs->inherits_from == bs) { |
| 1918 | child->bs->inherits_from = NULL; |
| 1919 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1920 | bdrv_detach_child(child); |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 1921 | } |
| 1922 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1923 | g_free(bs->opaque); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1924 | bs->opaque = NULL; |
| 1925 | bs->drv = NULL; |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1926 | bs->copy_on_read = 0; |
Paolo Bonzini | a275fa4 | 2012-05-08 16:51:43 +0200 | [diff] [blame] | 1927 | bs->backing_file[0] = '\0'; |
| 1928 | bs->backing_format[0] = '\0'; |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1929 | bs->total_sectors = 0; |
| 1930 | bs->encrypted = 0; |
| 1931 | bs->valid_key = 0; |
| 1932 | bs->sg = 0; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 1933 | bs->zero_beyond_eof = false; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1934 | QDECREF(bs->options); |
| 1935 | bs->options = NULL; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1936 | QDECREF(bs->full_open_options); |
| 1937 | bs->full_open_options = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1938 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1939 | if (bs->file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1940 | bdrv_unref(bs->file); |
Paolo Bonzini | 0ac9377 | 2012-05-08 16:51:44 +0200 | [diff] [blame] | 1941 | bs->file = NULL; |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1942 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1943 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1944 | |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 1945 | if (bs->blk) { |
| 1946 | blk_dev_change_media_cb(bs->blk, false); |
| 1947 | } |
Pavel Hrdina | 9ca1115 | 2012-08-09 12:44:48 +0200 | [diff] [blame] | 1948 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1949 | /*throttling disk I/O limits*/ |
| 1950 | if (bs->io_limits_enabled) { |
| 1951 | bdrv_io_limits_disable(bs); |
| 1952 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 1953 | |
| 1954 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 1955 | g_free(ban); |
| 1956 | } |
| 1957 | QLIST_INIT(&bs->aio_notifiers); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1958 | } |
| 1959 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1960 | void bdrv_close_all(void) |
| 1961 | { |
| 1962 | BlockDriverState *bs; |
| 1963 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1964 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1965 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 1966 | |
| 1967 | aio_context_acquire(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1968 | bdrv_close(bs); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1969 | aio_context_release(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1970 | } |
| 1971 | } |
| 1972 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1973 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
| 1974 | * graph_bdrv_state list. |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1975 | Also, NULL terminate the device_name to prevent double remove */ |
| 1976 | void bdrv_make_anon(BlockDriverState *bs) |
| 1977 | { |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1978 | /* |
| 1979 | * Take care to remove bs from bdrv_states only when it's actually |
| 1980 | * in it. Note that bs->device_list.tqe_prev is initially null, |
| 1981 | * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish |
| 1982 | * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by |
| 1983 | * resetting it to null on remove. |
| 1984 | */ |
| 1985 | if (bs->device_list.tqe_prev) { |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1986 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1987 | bs->device_list.tqe_prev = NULL; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1988 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1989 | if (bs->node_name[0] != '\0') { |
| 1990 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 1991 | } |
| 1992 | bs->node_name[0] = '\0'; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1993 | } |
| 1994 | |
Paolo Bonzini | e023b2e | 2012-05-08 16:51:41 +0200 | [diff] [blame] | 1995 | static void bdrv_rebind(BlockDriverState *bs) |
| 1996 | { |
| 1997 | if (bs->drv && bs->drv->bdrv_rebind) { |
| 1998 | bs->drv->bdrv_rebind(bs); |
| 1999 | } |
| 2000 | } |
| 2001 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2002 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
| 2003 | BlockDriverState *bs_src) |
| 2004 | { |
| 2005 | /* move some fields that need to stay attached to the device */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2006 | |
| 2007 | /* dev info */ |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 2008 | bs_dest->guest_block_size = bs_src->guest_block_size; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2009 | bs_dest->copy_on_read = bs_src->copy_on_read; |
| 2010 | |
| 2011 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
| 2012 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 2013 | /* i/o throttled req */ |
Alberto Garcia | 76f4afb | 2015-06-08 18:17:44 +0200 | [diff] [blame] | 2014 | bs_dest->throttle_state = bs_src->throttle_state, |
| 2015 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
| 2016 | bs_dest->pending_reqs[0] = bs_src->pending_reqs[0]; |
| 2017 | bs_dest->pending_reqs[1] = bs_src->pending_reqs[1]; |
| 2018 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; |
| 2019 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; |
| 2020 | memcpy(&bs_dest->round_robin, |
| 2021 | &bs_src->round_robin, |
| 2022 | sizeof(bs_dest->round_robin)); |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 2023 | memcpy(&bs_dest->throttle_timers, |
| 2024 | &bs_src->throttle_timers, |
| 2025 | sizeof(ThrottleTimers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2026 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2027 | /* r/w error */ |
| 2028 | bs_dest->on_read_error = bs_src->on_read_error; |
| 2029 | bs_dest->on_write_error = bs_src->on_write_error; |
| 2030 | |
| 2031 | /* i/o status */ |
| 2032 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
| 2033 | bs_dest->iostatus = bs_src->iostatus; |
| 2034 | |
| 2035 | /* dirty bitmap */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2036 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2037 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 2038 | /* reference count */ |
| 2039 | bs_dest->refcnt = bs_src->refcnt; |
| 2040 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2041 | /* job */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2042 | bs_dest->job = bs_src->job; |
| 2043 | |
| 2044 | /* keep the same entry in bdrv_states */ |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2045 | bs_dest->device_list = bs_src->device_list; |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2046 | bs_dest->blk = bs_src->blk; |
| 2047 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 2048 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
| 2049 | sizeof(bs_dest->op_blockers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2050 | } |
| 2051 | |
| 2052 | /* |
| 2053 | * Swap bs contents for two image chains while they are live, |
| 2054 | * while keeping required fields on the BlockDriverState that is |
| 2055 | * actually attached to a device. |
| 2056 | * |
| 2057 | * This will modify the BlockDriverState fields, and swap contents |
| 2058 | * between bs_new and bs_old. Both bs_new and bs_old are modified. |
| 2059 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2060 | * bs_new must not be attached to a BlockBackend. |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2061 | * |
| 2062 | * This function does not create any image files. |
| 2063 | */ |
| 2064 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) |
| 2065 | { |
| 2066 | BlockDriverState tmp; |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 2067 | BdrvChild *child; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2068 | |
Kevin Wolf | 6ee4ce1 | 2015-06-10 13:33:17 +0200 | [diff] [blame] | 2069 | bdrv_drain(bs_new); |
| 2070 | bdrv_drain(bs_old); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2071 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2072 | /* The code needs to swap the node_name but simply swapping node_list won't |
| 2073 | * work so first remove the nodes from the graph list, do the swap then |
| 2074 | * insert them back if needed. |
| 2075 | */ |
| 2076 | if (bs_new->node_name[0] != '\0') { |
| 2077 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); |
| 2078 | } |
| 2079 | if (bs_old->node_name[0] != '\0') { |
| 2080 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); |
| 2081 | } |
| 2082 | |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 2083 | /* If the BlockDriverState is part of a throttling group acquire |
| 2084 | * its lock since we're going to mess with the protected fields. |
| 2085 | * Otherwise there's no need to worry since no one else can touch |
| 2086 | * them. */ |
| 2087 | if (bs_old->throttle_state) { |
| 2088 | throttle_group_lock(bs_old); |
| 2089 | } |
| 2090 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2091 | /* bs_new must be unattached and shouldn't have anything fancy enabled */ |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2092 | assert(!bs_new->blk); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2093 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2094 | assert(bs_new->job == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2095 | assert(bs_new->io_limits_enabled == false); |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 2096 | assert(bs_new->throttle_state == NULL); |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 2097 | assert(!throttle_timers_are_initialized(&bs_new->throttle_timers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2098 | |
| 2099 | tmp = *bs_new; |
| 2100 | *bs_new = *bs_old; |
| 2101 | *bs_old = tmp; |
| 2102 | |
| 2103 | /* there are some fields that should not be swapped, move them back */ |
| 2104 | bdrv_move_feature_fields(&tmp, bs_old); |
| 2105 | bdrv_move_feature_fields(bs_old, bs_new); |
| 2106 | bdrv_move_feature_fields(bs_new, &tmp); |
| 2107 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2108 | /* bs_new must remain unattached */ |
Markus Armbruster | 7e7d56d | 2014-10-07 13:59:05 +0200 | [diff] [blame] | 2109 | assert(!bs_new->blk); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2110 | |
| 2111 | /* Check a few fields that should remain attached to the device */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2112 | assert(bs_new->job == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2113 | assert(bs_new->io_limits_enabled == false); |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 2114 | assert(bs_new->throttle_state == NULL); |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 2115 | assert(!throttle_timers_are_initialized(&bs_new->throttle_timers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2116 | |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 2117 | /* Release the ThrottleGroup lock */ |
| 2118 | if (bs_old->throttle_state) { |
| 2119 | throttle_group_unlock(bs_old); |
| 2120 | } |
| 2121 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2122 | /* insert the nodes back into the graph node list if needed */ |
| 2123 | if (bs_new->node_name[0] != '\0') { |
| 2124 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); |
| 2125 | } |
| 2126 | if (bs_old->node_name[0] != '\0') { |
| 2127 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); |
| 2128 | } |
| 2129 | |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 2130 | /* |
| 2131 | * Update lh_first.le_prev for non-empty lists. |
| 2132 | * |
| 2133 | * The head of the op blocker list doesn't change because it is moved back |
| 2134 | * in bdrv_move_feature_fields(). |
| 2135 | */ |
Kevin Wolf | 6ee4ce1 | 2015-06-10 13:33:17 +0200 | [diff] [blame] | 2136 | assert(QLIST_EMPTY(&bs_old->tracked_requests)); |
| 2137 | assert(QLIST_EMPTY(&bs_new->tracked_requests)); |
| 2138 | |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 2139 | QLIST_FIX_HEAD_PTR(&bs_new->children, next); |
| 2140 | QLIST_FIX_HEAD_PTR(&bs_old->children, next); |
| 2141 | |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 2142 | /* Update references in bs->opaque and children */ |
| 2143 | QLIST_FOREACH(child, &bs_old->children, next) { |
| 2144 | if (child->bs->inherits_from == bs_new) { |
| 2145 | child->bs->inherits_from = bs_old; |
| 2146 | } |
| 2147 | } |
| 2148 | QLIST_FOREACH(child, &bs_new->children, next) { |
| 2149 | if (child->bs->inherits_from == bs_old) { |
| 2150 | child->bs->inherits_from = bs_new; |
| 2151 | } |
| 2152 | } |
| 2153 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2154 | bdrv_rebind(bs_new); |
| 2155 | bdrv_rebind(bs_old); |
| 2156 | } |
| 2157 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2158 | /* |
| 2159 | * Add new bs contents at the top of an image chain while the chain is |
| 2160 | * live, while keeping required fields on the top layer. |
| 2161 | * |
| 2162 | * This will modify the BlockDriverState fields, and swap contents |
| 2163 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 2164 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2165 | * bs_new must not be attached to a BlockBackend. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 2166 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2167 | * This function does not create any image files. |
| 2168 | */ |
| 2169 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) |
| 2170 | { |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2171 | bdrv_swap(bs_new, bs_top); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2172 | |
| 2173 | /* The contents of 'tmp' will become bs_top, as we are |
| 2174 | * swapping bs_new and bs_top contents. */ |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2175 | bdrv_set_backing_hd(bs_top, bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2176 | } |
| 2177 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2178 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2179 | { |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 2180 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2181 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2182 | assert(!bs->refcnt); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2183 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2184 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 2185 | bdrv_close(bs); |
| 2186 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 2187 | /* remove from list, if necessary */ |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2188 | bdrv_make_anon(bs); |
aurel32 | 34c6f05 | 2008-04-08 19:51:21 +0000 | [diff] [blame] | 2189 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2190 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2191 | } |
| 2192 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2193 | /* |
| 2194 | * Run consistency checks on an image |
| 2195 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2196 | * 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] | 2197 | * 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] | 2198 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2199 | */ |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2200 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2201 | { |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 2202 | if (bs->drv == NULL) { |
| 2203 | return -ENOMEDIUM; |
| 2204 | } |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2205 | if (bs->drv->bdrv_check == NULL) { |
| 2206 | return -ENOTSUP; |
| 2207 | } |
| 2208 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2209 | memset(res, 0, sizeof(*res)); |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2210 | return bs->drv->bdrv_check(bs, res, fix); |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2211 | } |
| 2212 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2213 | #define COMMIT_BUF_SECTORS 2048 |
| 2214 | |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2215 | /* commit COW file into the raw image */ |
| 2216 | int bdrv_commit(BlockDriverState *bs) |
| 2217 | { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2218 | BlockDriver *drv = bs->drv; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2219 | int64_t sector, total_sectors, length, backing_length; |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2220 | int n, ro, open_flags; |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2221 | int ret = 0; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2222 | uint8_t *buf = NULL; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2223 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2224 | if (!drv) |
| 2225 | return -ENOMEDIUM; |
Liu Yuan | 6bb4515 | 2014-09-01 13:35:21 +0800 | [diff] [blame] | 2226 | |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2227 | if (!bs->backing_hd) { |
| 2228 | return -ENOTSUP; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2229 | } |
| 2230 | |
Fam Zheng | bb00021 | 2014-09-11 13:14:00 +0800 | [diff] [blame] | 2231 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || |
| 2232 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { |
Stefan Hajnoczi | 2d3735d | 2012-01-18 14:40:41 +0000 | [diff] [blame] | 2233 | return -EBUSY; |
| 2234 | } |
| 2235 | |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2236 | ro = bs->backing_hd->read_only; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2237 | open_flags = bs->backing_hd->open_flags; |
| 2238 | |
| 2239 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2240 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
| 2241 | return -EACCES; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2242 | } |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2243 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2244 | |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2245 | length = bdrv_getlength(bs); |
| 2246 | if (length < 0) { |
| 2247 | ret = length; |
| 2248 | goto ro_cleanup; |
| 2249 | } |
| 2250 | |
| 2251 | backing_length = bdrv_getlength(bs->backing_hd); |
| 2252 | if (backing_length < 0) { |
| 2253 | ret = backing_length; |
| 2254 | goto ro_cleanup; |
| 2255 | } |
| 2256 | |
| 2257 | /* If our top snapshot is larger than the backing file image, |
| 2258 | * grow the backing file image if possible. If not possible, |
| 2259 | * we must return an error */ |
| 2260 | if (length > backing_length) { |
| 2261 | ret = bdrv_truncate(bs->backing_hd, length); |
| 2262 | if (ret < 0) { |
| 2263 | goto ro_cleanup; |
| 2264 | } |
| 2265 | } |
| 2266 | |
| 2267 | total_sectors = length >> BDRV_SECTOR_BITS; |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2268 | |
| 2269 | /* qemu_try_blockalign() for bs will choose an alignment that works for |
| 2270 | * bs->backing_hd as well, so no need to compare the alignment manually. */ |
| 2271 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
| 2272 | if (buf == NULL) { |
| 2273 | ret = -ENOMEM; |
| 2274 | goto ro_cleanup; |
| 2275 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2276 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2277 | for (sector = 0; sector < total_sectors; sector += n) { |
Paolo Bonzini | d663640 | 2013-09-04 19:00:25 +0200 | [diff] [blame] | 2278 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
| 2279 | if (ret < 0) { |
| 2280 | goto ro_cleanup; |
| 2281 | } |
| 2282 | if (ret) { |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2283 | ret = bdrv_read(bs, sector, buf, n); |
| 2284 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2285 | goto ro_cleanup; |
| 2286 | } |
| 2287 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2288 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
| 2289 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2290 | goto ro_cleanup; |
| 2291 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2292 | } |
| 2293 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2294 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2295 | if (drv->bdrv_make_empty) { |
| 2296 | ret = drv->bdrv_make_empty(bs); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2297 | if (ret < 0) { |
| 2298 | goto ro_cleanup; |
| 2299 | } |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2300 | bdrv_flush(bs); |
| 2301 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2302 | |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2303 | /* |
| 2304 | * Make sure all data we wrote to the backing device is actually |
| 2305 | * stable on disk. |
| 2306 | */ |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2307 | if (bs->backing_hd) { |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2308 | bdrv_flush(bs->backing_hd); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2309 | } |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2310 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2311 | ret = 0; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2312 | ro_cleanup: |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2313 | qemu_vfree(buf); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2314 | |
| 2315 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2316 | /* ignoring error return here */ |
| 2317 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2318 | } |
| 2319 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2320 | return ret; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2321 | } |
| 2322 | |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2323 | int bdrv_commit_all(void) |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2324 | { |
| 2325 | BlockDriverState *bs; |
| 2326 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2327 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2328 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2329 | |
| 2330 | aio_context_acquire(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2331 | if (bs->drv && bs->backing_hd) { |
| 2332 | int ret = bdrv_commit(bs); |
| 2333 | if (ret < 0) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2334 | aio_context_release(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2335 | return ret; |
| 2336 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2337 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2338 | aio_context_release(aio_context); |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2339 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2340 | return 0; |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2341 | } |
| 2342 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2343 | /* |
| 2344 | * Return values: |
| 2345 | * 0 - success |
| 2346 | * -EINVAL - backing format specified, but no file |
| 2347 | * -ENOSPC - can't update the backing file because no space is left in the |
| 2348 | * image file header |
| 2349 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 2350 | */ |
| 2351 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 2352 | const char *backing_file, const char *backing_fmt) |
| 2353 | { |
| 2354 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2355 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2356 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 2357 | /* Backing file format doesn't make sense without a backing file */ |
| 2358 | if (backing_fmt && !backing_file) { |
| 2359 | return -EINVAL; |
| 2360 | } |
| 2361 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2362 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2363 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2364 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2365 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2366 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2367 | |
| 2368 | if (ret == 0) { |
| 2369 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 2370 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 2371 | } |
| 2372 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2373 | } |
| 2374 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2375 | /* |
| 2376 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 2377 | * |
| 2378 | * active is the current topmost image. |
| 2379 | * |
| 2380 | * Returns NULL if bs is not found in active's image chain, |
| 2381 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2382 | * |
| 2383 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2384 | */ |
| 2385 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 2386 | BlockDriverState *bs) |
| 2387 | { |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2388 | while (active && bs != active->backing_hd) { |
| 2389 | active = active->backing_hd; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2390 | } |
| 2391 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2392 | return active; |
| 2393 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2394 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2395 | /* Given a BDS, searches for the base layer. */ |
| 2396 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 2397 | { |
| 2398 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2399 | } |
| 2400 | |
| 2401 | typedef struct BlkIntermediateStates { |
| 2402 | BlockDriverState *bs; |
| 2403 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; |
| 2404 | } BlkIntermediateStates; |
| 2405 | |
| 2406 | |
| 2407 | /* |
| 2408 | * Drops images above 'base' up to and including 'top', and sets the image |
| 2409 | * above 'top' to have base as its backing file. |
| 2410 | * |
| 2411 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 2412 | * information in 'bs' can be properly updated. |
| 2413 | * |
| 2414 | * E.g., this will convert the following chain: |
| 2415 | * bottom <- base <- intermediate <- top <- active |
| 2416 | * |
| 2417 | * to |
| 2418 | * |
| 2419 | * bottom <- base <- active |
| 2420 | * |
| 2421 | * It is allowed for bottom==base, in which case it converts: |
| 2422 | * |
| 2423 | * base <- intermediate <- top <- active |
| 2424 | * |
| 2425 | * to |
| 2426 | * |
| 2427 | * base <- active |
| 2428 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2429 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 2430 | * overlay image metadata. |
| 2431 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2432 | * Error conditions: |
| 2433 | * if active == top, that is considered an error |
| 2434 | * |
| 2435 | */ |
| 2436 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2437 | BlockDriverState *base, const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2438 | { |
| 2439 | BlockDriverState *intermediate; |
| 2440 | BlockDriverState *base_bs = NULL; |
| 2441 | BlockDriverState *new_top_bs = NULL; |
| 2442 | BlkIntermediateStates *intermediate_state, *next; |
| 2443 | int ret = -EIO; |
| 2444 | |
| 2445 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; |
| 2446 | QSIMPLEQ_INIT(&states_to_delete); |
| 2447 | |
| 2448 | if (!top->drv || !base->drv) { |
| 2449 | goto exit; |
| 2450 | } |
| 2451 | |
| 2452 | new_top_bs = bdrv_find_overlay(active, top); |
| 2453 | |
| 2454 | if (new_top_bs == NULL) { |
| 2455 | /* we could not find the image above 'top', this is an error */ |
| 2456 | goto exit; |
| 2457 | } |
| 2458 | |
| 2459 | /* special case of new_top_bs->backing_hd already pointing to base - nothing |
| 2460 | * to do, no intermediate images */ |
| 2461 | if (new_top_bs->backing_hd == base) { |
| 2462 | ret = 0; |
| 2463 | goto exit; |
| 2464 | } |
| 2465 | |
| 2466 | intermediate = top; |
| 2467 | |
| 2468 | /* now we will go down through the list, and add each BDS we find |
| 2469 | * into our deletion queue, until we hit the 'base' |
| 2470 | */ |
| 2471 | while (intermediate) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 2472 | intermediate_state = g_new0(BlkIntermediateStates, 1); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2473 | intermediate_state->bs = intermediate; |
| 2474 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); |
| 2475 | |
| 2476 | if (intermediate->backing_hd == base) { |
| 2477 | base_bs = intermediate->backing_hd; |
| 2478 | break; |
| 2479 | } |
| 2480 | intermediate = intermediate->backing_hd; |
| 2481 | } |
| 2482 | if (base_bs == NULL) { |
| 2483 | /* something went wrong, we did not end at the base. safely |
| 2484 | * unravel everything, and exit with error */ |
| 2485 | goto exit; |
| 2486 | } |
| 2487 | |
| 2488 | /* success - we can delete the intermediate states, and link top->base */ |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2489 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
| 2490 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2491 | base_bs->drv ? base_bs->drv->format_name : ""); |
| 2492 | if (ret) { |
| 2493 | goto exit; |
| 2494 | } |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2495 | bdrv_set_backing_hd(new_top_bs, base_bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2496 | |
| 2497 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2498 | /* so that bdrv_close() does not recursively close the chain */ |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2499 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2500 | bdrv_unref(intermediate_state->bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2501 | } |
| 2502 | ret = 0; |
| 2503 | |
| 2504 | exit: |
| 2505 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2506 | g_free(intermediate_state); |
| 2507 | } |
| 2508 | return ret; |
| 2509 | } |
| 2510 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2511 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2512 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 2513 | */ |
| 2514 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 2515 | { |
| 2516 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2517 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2518 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2519 | return -ENOMEDIUM; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2520 | if (!drv->bdrv_truncate) |
| 2521 | return -ENOTSUP; |
Naphtali Sprei | 59f2689 | 2009-10-26 16:25:16 +0200 | [diff] [blame] | 2522 | if (bs->read_only) |
| 2523 | return -EACCES; |
Jeff Cody | 9c75e16 | 2014-06-25 16:55:30 -0400 | [diff] [blame] | 2524 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2525 | ret = drv->bdrv_truncate(bs, offset); |
| 2526 | if (ret == 0) { |
| 2527 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 2528 | bdrv_dirty_bitmap_truncate(bs); |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 2529 | if (bs->blk) { |
| 2530 | blk_dev_resize_cb(bs->blk); |
| 2531 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2532 | } |
| 2533 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2534 | } |
| 2535 | |
| 2536 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 2537 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 2538 | * allocated space. Return < 0 if error or unknown. |
| 2539 | */ |
| 2540 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 2541 | { |
| 2542 | BlockDriver *drv = bs->drv; |
| 2543 | if (!drv) { |
| 2544 | return -ENOMEDIUM; |
| 2545 | } |
| 2546 | if (drv->bdrv_get_allocated_file_size) { |
| 2547 | return drv->bdrv_get_allocated_file_size(bs); |
| 2548 | } |
| 2549 | if (bs->file) { |
| 2550 | return bdrv_get_allocated_file_size(bs->file); |
| 2551 | } |
| 2552 | return -ENOTSUP; |
| 2553 | } |
| 2554 | |
| 2555 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2556 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2557 | */ |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2558 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2559 | { |
| 2560 | BlockDriver *drv = bs->drv; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2561 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2562 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2563 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2564 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 2565 | if (drv->has_variable_length) { |
| 2566 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 2567 | if (ret < 0) { |
| 2568 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 2569 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2570 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2571 | return bs->total_sectors; |
| 2572 | } |
| 2573 | |
| 2574 | /** |
| 2575 | * Return length in bytes on success, -errno on error. |
| 2576 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 2577 | */ |
| 2578 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 2579 | { |
| 2580 | int64_t ret = bdrv_nb_sectors(bs); |
| 2581 | |
Fam Zheng | 4a9c9ea | 2015-05-15 16:36:05 +0800 | [diff] [blame] | 2582 | ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2583 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2584 | } |
| 2585 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2586 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 2587 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2588 | { |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2589 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
| 2590 | |
| 2591 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2592 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 2593 | |
Paolo Bonzini | ff06f5f | 2012-09-28 17:22:54 +0200 | [diff] [blame] | 2594 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
| 2595 | BlockdevOnError on_write_error) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 2596 | { |
| 2597 | bs->on_read_error = on_read_error; |
| 2598 | bs->on_write_error = on_write_error; |
| 2599 | } |
| 2600 | |
Paolo Bonzini | 1ceee0d | 2012-09-28 17:22:56 +0200 | [diff] [blame] | 2601 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 2602 | { |
| 2603 | return is_read ? bs->on_read_error : bs->on_write_error; |
| 2604 | } |
| 2605 | |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2606 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
| 2607 | { |
| 2608 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; |
| 2609 | |
| 2610 | switch (on_err) { |
| 2611 | case BLOCKDEV_ON_ERROR_ENOSPC: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 2612 | return (error == ENOSPC) ? |
| 2613 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2614 | case BLOCKDEV_ON_ERROR_STOP: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 2615 | return BLOCK_ERROR_ACTION_STOP; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2616 | case BLOCKDEV_ON_ERROR_REPORT: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 2617 | return BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2618 | case BLOCKDEV_ON_ERROR_IGNORE: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 2619 | return BLOCK_ERROR_ACTION_IGNORE; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2620 | default: |
| 2621 | abort(); |
| 2622 | } |
| 2623 | } |
| 2624 | |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2625 | static void send_qmp_error_event(BlockDriverState *bs, |
| 2626 | BlockErrorAction action, |
| 2627 | bool is_read, int error) |
| 2628 | { |
Peter Maydell | 573742a | 2014-10-10 20:33:03 +0100 | [diff] [blame] | 2629 | IoOperationType optype; |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2630 | |
Peter Maydell | 573742a | 2014-10-10 20:33:03 +0100 | [diff] [blame] | 2631 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; |
| 2632 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), optype, action, |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2633 | bdrv_iostatus_is_enabled(bs), |
Luiz Capitulino | 624ff57 | 2014-09-11 10:25:48 -0400 | [diff] [blame] | 2634 | error == ENOSPC, strerror(error), |
| 2635 | &error_abort); |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2636 | } |
| 2637 | |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2638 | /* This is done by device models because, while the block layer knows |
| 2639 | * about the error, it does not know whether an operation comes from |
| 2640 | * the device or the block layer (from a job, for example). |
| 2641 | */ |
| 2642 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, |
| 2643 | bool is_read, int error) |
| 2644 | { |
| 2645 | assert(error >= 0); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 2646 | |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 2647 | if (action == BLOCK_ERROR_ACTION_STOP) { |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 2648 | /* First set the iostatus, so that "info block" returns an iostatus |
| 2649 | * that matches the events raised so far (an additional error iostatus |
| 2650 | * is fine, but not a lost one). |
| 2651 | */ |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2652 | bdrv_iostatus_set_err(bs, error); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 2653 | |
| 2654 | /* Then raise the request to stop the VM and the event. |
| 2655 | * qemu_system_vmstop_request_prepare has two effects. First, |
| 2656 | * it ensures that the STOP event always comes after the |
| 2657 | * BLOCK_IO_ERROR event. Second, it ensures that even if management |
| 2658 | * can observe the STOP event and do a "cont" before the STOP |
| 2659 | * event is issued, the VM will not stop. In this case, vm_start() |
| 2660 | * also ensures that the STOP/RESUME pair of events is emitted. |
| 2661 | */ |
| 2662 | qemu_system_vmstop_request_prepare(); |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2663 | send_qmp_error_event(bs, action, is_read, error); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 2664 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
| 2665 | } else { |
Luiz Capitulino | c7c2ff0 | 2014-08-29 16:07:27 -0400 | [diff] [blame] | 2666 | send_qmp_error_event(bs, action, is_read, error); |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 2667 | } |
| 2668 | } |
| 2669 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2670 | int bdrv_is_read_only(BlockDriverState *bs) |
| 2671 | { |
| 2672 | return bs->read_only; |
| 2673 | } |
| 2674 | |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 2675 | int bdrv_is_sg(BlockDriverState *bs) |
| 2676 | { |
| 2677 | return bs->sg; |
| 2678 | } |
| 2679 | |
Christoph Hellwig | e900a7b | 2009-09-04 19:01:15 +0200 | [diff] [blame] | 2680 | int bdrv_enable_write_cache(BlockDriverState *bs) |
| 2681 | { |
| 2682 | return bs->enable_write_cache; |
| 2683 | } |
| 2684 | |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 2685 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
| 2686 | { |
| 2687 | bs->enable_write_cache = wce; |
Jeff Cody | 55b110f | 2012-09-20 15:13:18 -0400 | [diff] [blame] | 2688 | |
| 2689 | /* so a reopen() will preserve wce */ |
| 2690 | if (wce) { |
| 2691 | bs->open_flags |= BDRV_O_CACHE_WB; |
| 2692 | } else { |
| 2693 | bs->open_flags &= ~BDRV_O_CACHE_WB; |
| 2694 | } |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 2695 | } |
| 2696 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2697 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 2698 | { |
| 2699 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 2700 | return 1; |
| 2701 | return bs->encrypted; |
| 2702 | } |
| 2703 | |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2704 | int bdrv_key_required(BlockDriverState *bs) |
| 2705 | { |
| 2706 | BlockDriverState *backing_hd = bs->backing_hd; |
| 2707 | |
| 2708 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
| 2709 | return 1; |
| 2710 | return (bs->encrypted && !bs->valid_key); |
| 2711 | } |
| 2712 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2713 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 2714 | { |
| 2715 | int ret; |
| 2716 | if (bs->backing_hd && bs->backing_hd->encrypted) { |
| 2717 | ret = bdrv_set_key(bs->backing_hd, key); |
| 2718 | if (ret < 0) |
| 2719 | return ret; |
| 2720 | if (!bs->encrypted) |
| 2721 | return 0; |
| 2722 | } |
Shahar Havivi | fd04a2a | 2010-03-06 00:26:13 +0200 | [diff] [blame] | 2723 | if (!bs->encrypted) { |
| 2724 | return -EINVAL; |
| 2725 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 2726 | return -ENOMEDIUM; |
| 2727 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2728 | ret = bs->drv->bdrv_set_key(bs, key); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 2729 | if (ret < 0) { |
| 2730 | bs->valid_key = 0; |
| 2731 | } else if (!bs->valid_key) { |
| 2732 | bs->valid_key = 1; |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 2733 | if (bs->blk) { |
| 2734 | /* call the change callback now, we skipped it on open */ |
| 2735 | blk_dev_change_media_cb(bs->blk, true); |
| 2736 | } |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 2737 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2738 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2739 | } |
| 2740 | |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2741 | /* |
| 2742 | * Provide an encryption key for @bs. |
| 2743 | * If @key is non-null: |
| 2744 | * If @bs is not encrypted, fail. |
| 2745 | * Else if the key is invalid, fail. |
| 2746 | * Else set @bs's key to @key, replacing the existing key, if any. |
| 2747 | * If @key is null: |
| 2748 | * If @bs is encrypted and still lacks a key, fail. |
| 2749 | * Else do nothing. |
| 2750 | * On failure, store an error object through @errp if non-null. |
| 2751 | */ |
| 2752 | void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp) |
| 2753 | { |
| 2754 | if (key) { |
| 2755 | if (!bdrv_is_encrypted(bs)) { |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2756 | error_setg(errp, "Node '%s' is not encrypted", |
| 2757 | bdrv_get_device_or_node_name(bs)); |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2758 | } else if (bdrv_set_key(bs, key) < 0) { |
Markus Armbruster | c6bd8c7 | 2015-03-17 11:54:50 +0100 | [diff] [blame] | 2759 | error_setg(errp, QERR_INVALID_PASSWORD); |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2760 | } |
| 2761 | } else { |
| 2762 | if (bdrv_key_required(bs)) { |
Markus Armbruster | b1ca639 | 2015-01-29 10:37:01 +0100 | [diff] [blame] | 2763 | error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED, |
| 2764 | "'%s' (%s) is encrypted", |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2765 | bdrv_get_device_or_node_name(bs), |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2766 | bdrv_get_encrypted_filename(bs)); |
| 2767 | } |
| 2768 | } |
| 2769 | } |
| 2770 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 2771 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2772 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 2773 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2774 | } |
| 2775 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2776 | static int qsort_strcmp(const void *a, const void *b) |
| 2777 | { |
| 2778 | return strcmp(a, b); |
| 2779 | } |
| 2780 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2781 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2782 | void *opaque) |
| 2783 | { |
| 2784 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2785 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2786 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2787 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2788 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 2789 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2790 | if (drv->format_name) { |
| 2791 | bool found = false; |
| 2792 | int i = count; |
| 2793 | while (formats && i && !found) { |
| 2794 | found = !strcmp(formats[--i], drv->format_name); |
| 2795 | } |
| 2796 | |
| 2797 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 2798 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2799 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2800 | } |
| 2801 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2802 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2803 | |
| 2804 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 2805 | |
| 2806 | for (i = 0; i < count; i++) { |
| 2807 | it(opaque, formats[i]); |
| 2808 | } |
| 2809 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2810 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2811 | } |
| 2812 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2813 | /* This function is to find a node in the bs graph */ |
| 2814 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 2815 | { |
| 2816 | BlockDriverState *bs; |
| 2817 | |
| 2818 | assert(node_name); |
| 2819 | |
| 2820 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 2821 | if (!strcmp(node_name, bs->node_name)) { |
| 2822 | return bs; |
| 2823 | } |
| 2824 | } |
| 2825 | return NULL; |
| 2826 | } |
| 2827 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2828 | /* 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] | 2829 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2830 | { |
| 2831 | BlockDeviceInfoList *list, *entry; |
| 2832 | BlockDriverState *bs; |
| 2833 | |
| 2834 | list = NULL; |
| 2835 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 2836 | BlockDeviceInfo *info = bdrv_block_device_info(bs, errp); |
| 2837 | if (!info) { |
| 2838 | qapi_free_BlockDeviceInfoList(list); |
| 2839 | return NULL; |
| 2840 | } |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2841 | entry = g_malloc0(sizeof(*entry)); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 2842 | entry->value = info; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2843 | entry->next = list; |
| 2844 | list = entry; |
| 2845 | } |
| 2846 | |
| 2847 | return list; |
| 2848 | } |
| 2849 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2850 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 2851 | const char *node_name, |
| 2852 | Error **errp) |
| 2853 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2854 | BlockBackend *blk; |
| 2855 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2856 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2857 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2858 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2859 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2860 | if (blk) { |
| 2861 | return blk_bs(blk); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2862 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2863 | } |
| 2864 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2865 | if (node_name) { |
| 2866 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2867 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2868 | if (bs) { |
| 2869 | return bs; |
| 2870 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2871 | } |
| 2872 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2873 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 2874 | device ? device : "", |
| 2875 | node_name ? node_name : ""); |
| 2876 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2877 | } |
| 2878 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 2879 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 2880 | * return false. If either argument is NULL, return false. */ |
| 2881 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 2882 | { |
| 2883 | while (top && top != base) { |
| 2884 | top = top->backing_hd; |
| 2885 | } |
| 2886 | |
| 2887 | return top != NULL; |
| 2888 | } |
| 2889 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 2890 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 2891 | { |
| 2892 | if (!bs) { |
| 2893 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 2894 | } |
| 2895 | return QTAILQ_NEXT(bs, node_list); |
| 2896 | } |
| 2897 | |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 2898 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 2899 | { |
| 2900 | if (!bs) { |
| 2901 | return QTAILQ_FIRST(&bdrv_states); |
| 2902 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2903 | return QTAILQ_NEXT(bs, device_list); |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 2904 | } |
| 2905 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 2906 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 2907 | { |
| 2908 | return bs->node_name; |
| 2909 | } |
| 2910 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2911 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2912 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2913 | { |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2914 | return bs->blk ? blk_name(bs->blk) : ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2915 | } |
| 2916 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 2917 | /* This can be used to identify nodes that might not have a device |
| 2918 | * name associated. Since node and device names live in the same |
| 2919 | * namespace, the result is unambiguous. The exception is if both are |
| 2920 | * absent, then this returns an empty (non-null) string. */ |
| 2921 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 2922 | { |
| 2923 | return bs->blk ? blk_name(bs->blk) : bs->node_name; |
| 2924 | } |
| 2925 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 2926 | int bdrv_get_flags(BlockDriverState *bs) |
| 2927 | { |
| 2928 | return bs->open_flags; |
| 2929 | } |
| 2930 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 2931 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 2932 | { |
| 2933 | return 1; |
| 2934 | } |
| 2935 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 2936 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 2937 | { |
| 2938 | assert(bs->drv); |
| 2939 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 2940 | /* If BS is a copy on write image, it is initialized to |
| 2941 | the contents of the base image, which may not be zeroes. */ |
| 2942 | if (bs->backing_hd) { |
| 2943 | return 0; |
| 2944 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 2945 | if (bs->drv->bdrv_has_zero_init) { |
| 2946 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 2947 | } |
| 2948 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 2949 | /* safe default */ |
| 2950 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 2951 | } |
| 2952 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 2953 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 2954 | { |
| 2955 | BlockDriverInfo bdi; |
| 2956 | |
| 2957 | if (bs->backing_hd) { |
| 2958 | return false; |
| 2959 | } |
| 2960 | |
| 2961 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 2962 | return bdi.unallocated_blocks_are_zero; |
| 2963 | } |
| 2964 | |
| 2965 | return false; |
| 2966 | } |
| 2967 | |
| 2968 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 2969 | { |
| 2970 | BlockDriverInfo bdi; |
| 2971 | |
| 2972 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { |
| 2973 | return false; |
| 2974 | } |
| 2975 | |
| 2976 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 2977 | return bdi.can_write_zeroes_with_unmap; |
| 2978 | } |
| 2979 | |
| 2980 | return false; |
| 2981 | } |
| 2982 | |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 2983 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 2984 | { |
| 2985 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 2986 | return bs->backing_file; |
| 2987 | else if (bs->encrypted) |
| 2988 | return bs->filename; |
| 2989 | else |
| 2990 | return NULL; |
| 2991 | } |
| 2992 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2993 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2994 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2995 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 2996 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2997 | } |
| 2998 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 2999 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 3000 | { |
| 3001 | BlockDriver *drv = bs->drv; |
| 3002 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3003 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 3004 | if (!drv->bdrv_get_info) |
| 3005 | return -ENOTSUP; |
| 3006 | memset(bdi, 0, sizeof(*bdi)); |
| 3007 | return drv->bdrv_get_info(bs, bdi); |
| 3008 | } |
| 3009 | |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 3010 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
| 3011 | { |
| 3012 | BlockDriver *drv = bs->drv; |
| 3013 | if (drv && drv->bdrv_get_specific_info) { |
| 3014 | return drv->bdrv_get_specific_info(bs); |
| 3015 | } |
| 3016 | return NULL; |
| 3017 | } |
| 3018 | |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3019 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
| 3020 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 3021 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3022 | return; |
| 3023 | } |
| 3024 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 3025 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3026 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3027 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3028 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 3029 | const char *tag) |
| 3030 | { |
| 3031 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
| 3032 | bs = bs->file; |
| 3033 | } |
| 3034 | |
| 3035 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 3036 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 3037 | } |
| 3038 | |
| 3039 | return -ENOTSUP; |
| 3040 | } |
| 3041 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 3042 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 3043 | { |
| 3044 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
| 3045 | bs = bs->file; |
| 3046 | } |
| 3047 | |
| 3048 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 3049 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 3050 | } |
| 3051 | |
| 3052 | return -ENOTSUP; |
| 3053 | } |
| 3054 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3055 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 3056 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 3057 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3058 | bs = bs->file; |
| 3059 | } |
| 3060 | |
| 3061 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 3062 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 3063 | } |
| 3064 | |
| 3065 | return -ENOTSUP; |
| 3066 | } |
| 3067 | |
| 3068 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 3069 | { |
| 3070 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
| 3071 | bs = bs->file; |
| 3072 | } |
| 3073 | |
| 3074 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 3075 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 3076 | } |
| 3077 | |
| 3078 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3079 | } |
| 3080 | |
Blue Swirl | 199630b | 2010-07-25 20:49:34 +0000 | [diff] [blame] | 3081 | int bdrv_is_snapshot(BlockDriverState *bs) |
| 3082 | { |
| 3083 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
| 3084 | } |
| 3085 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3086 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 3087 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 3088 | * from a BDS as backing_file should not be done, as that may be relative to |
| 3089 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3090 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 3091 | const char *backing_file) |
| 3092 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3093 | char *filename_full = NULL; |
| 3094 | char *backing_file_full = NULL; |
| 3095 | char *filename_tmp = NULL; |
| 3096 | int is_protocol = 0; |
| 3097 | BlockDriverState *curr_bs = NULL; |
| 3098 | BlockDriverState *retval = NULL; |
| 3099 | |
| 3100 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3101 | return NULL; |
| 3102 | } |
| 3103 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3104 | filename_full = g_malloc(PATH_MAX); |
| 3105 | backing_file_full = g_malloc(PATH_MAX); |
| 3106 | filename_tmp = g_malloc(PATH_MAX); |
| 3107 | |
| 3108 | is_protocol = path_has_protocol(backing_file); |
| 3109 | |
| 3110 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { |
| 3111 | |
| 3112 | /* If either of the filename paths is actually a protocol, then |
| 3113 | * compare unmodified paths; otherwise make paths relative */ |
| 3114 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 3115 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
| 3116 | retval = curr_bs->backing_hd; |
| 3117 | break; |
| 3118 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3119 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3120 | /* If not an absolute filename path, make it relative to the current |
| 3121 | * image's filename path */ |
| 3122 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 3123 | backing_file); |
| 3124 | |
| 3125 | /* We are going to compare absolute pathnames */ |
| 3126 | if (!realpath(filename_tmp, filename_full)) { |
| 3127 | continue; |
| 3128 | } |
| 3129 | |
| 3130 | /* We need to make sure the backing filename we are comparing against |
| 3131 | * is relative to the current image filename (or absolute) */ |
| 3132 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 3133 | curr_bs->backing_file); |
| 3134 | |
| 3135 | if (!realpath(filename_tmp, backing_file_full)) { |
| 3136 | continue; |
| 3137 | } |
| 3138 | |
| 3139 | if (strcmp(backing_file_full, filename_full) == 0) { |
| 3140 | retval = curr_bs->backing_hd; |
| 3141 | break; |
| 3142 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3143 | } |
| 3144 | } |
| 3145 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3146 | g_free(filename_full); |
| 3147 | g_free(backing_file_full); |
| 3148 | g_free(filename_tmp); |
| 3149 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3150 | } |
| 3151 | |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 3152 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
| 3153 | { |
| 3154 | if (!bs->drv) { |
| 3155 | return 0; |
| 3156 | } |
| 3157 | |
| 3158 | if (!bs->backing_hd) { |
| 3159 | return 0; |
| 3160 | } |
| 3161 | |
| 3162 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); |
| 3163 | } |
| 3164 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3165 | void bdrv_init(void) |
| 3166 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 3167 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3168 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 3169 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 3170 | void bdrv_init_with_whitelist(void) |
| 3171 | { |
| 3172 | use_bdrv_whitelist = 1; |
| 3173 | bdrv_init(); |
| 3174 | } |
| 3175 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3176 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3177 | { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3178 | Error *local_err = NULL; |
| 3179 | int ret; |
| 3180 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3181 | if (!bs->drv) { |
| 3182 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3183 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3184 | |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 3185 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
| 3186 | return; |
| 3187 | } |
| 3188 | bs->open_flags &= ~BDRV_O_INCOMING; |
| 3189 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3190 | if (bs->drv->bdrv_invalidate_cache) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3191 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3192 | } else if (bs->file) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3193 | bdrv_invalidate_cache(bs->file, &local_err); |
| 3194 | } |
| 3195 | if (local_err) { |
| 3196 | error_propagate(errp, local_err); |
| 3197 | return; |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3198 | } |
| 3199 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3200 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 3201 | if (ret < 0) { |
| 3202 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 3203 | return; |
| 3204 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3205 | } |
| 3206 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3207 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3208 | { |
| 3209 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3210 | Error *local_err = NULL; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3211 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3212 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3213 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 3214 | |
| 3215 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3216 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3217 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3218 | if (local_err) { |
| 3219 | error_propagate(errp, local_err); |
| 3220 | return; |
| 3221 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3222 | } |
| 3223 | } |
| 3224 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 3225 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3226 | /* removable device support */ |
| 3227 | |
| 3228 | /** |
| 3229 | * Return TRUE if the media is present |
| 3230 | */ |
| 3231 | int bdrv_is_inserted(BlockDriverState *bs) |
| 3232 | { |
| 3233 | BlockDriver *drv = bs->drv; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 3234 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3235 | if (!drv) |
| 3236 | return 0; |
| 3237 | if (!drv->bdrv_is_inserted) |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 3238 | return 1; |
| 3239 | return drv->bdrv_is_inserted(bs); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3240 | } |
| 3241 | |
| 3242 | /** |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 3243 | * Return whether the media changed since the last call to this |
| 3244 | * function, or -ENOTSUP if we don't know. Most drivers don't know. |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3245 | */ |
| 3246 | int bdrv_media_changed(BlockDriverState *bs) |
| 3247 | { |
| 3248 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3249 | |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 3250 | if (drv && drv->bdrv_media_changed) { |
| 3251 | return drv->bdrv_media_changed(bs); |
| 3252 | } |
| 3253 | return -ENOTSUP; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3254 | } |
| 3255 | |
| 3256 | /** |
| 3257 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 3258 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 3259 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3260 | { |
| 3261 | BlockDriver *drv = bs->drv; |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3262 | const char *device_name; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3263 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 3264 | if (drv && drv->bdrv_eject) { |
| 3265 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3266 | } |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 3267 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3268 | device_name = bdrv_get_device_name(bs); |
| 3269 | if (device_name[0] != '\0') { |
| 3270 | qapi_event_send_device_tray_moved(device_name, |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 3271 | eject_flag, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 3272 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3273 | } |
| 3274 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3275 | /** |
| 3276 | * Lock or unlock the media (if it is locked, the user won't be able |
| 3277 | * to eject it manually). |
| 3278 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3279 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3280 | { |
| 3281 | BlockDriver *drv = bs->drv; |
| 3282 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3283 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 3284 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3285 | if (drv && drv->bdrv_lock_medium) { |
| 3286 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3287 | } |
| 3288 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 3289 | |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 3290 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 3291 | { |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 3292 | bs->guest_block_size = align; |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 3293 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3294 | |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3295 | BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) |
| 3296 | { |
| 3297 | BdrvDirtyBitmap *bm; |
| 3298 | |
| 3299 | assert(name); |
| 3300 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
| 3301 | if (bm->name && !strcmp(name, bm->name)) { |
| 3302 | return bm; |
| 3303 | } |
| 3304 | } |
| 3305 | return NULL; |
| 3306 | } |
| 3307 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3308 | void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3309 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3310 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3311 | g_free(bitmap->name); |
| 3312 | bitmap->name = NULL; |
| 3313 | } |
| 3314 | |
| 3315 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3316 | uint32_t granularity, |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3317 | const char *name, |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 3318 | Error **errp) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3319 | { |
| 3320 | int64_t bitmap_size; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3321 | BdrvDirtyBitmap *bitmap; |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3322 | uint32_t sector_granularity; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 3323 | |
Paolo Bonzini | 50717e9 | 2013-01-21 17:09:45 +0100 | [diff] [blame] | 3324 | assert((granularity & (granularity - 1)) == 0); |
| 3325 | |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3326 | if (name && bdrv_find_dirty_bitmap(bs, name)) { |
| 3327 | error_setg(errp, "Bitmap already exists: %s", name); |
| 3328 | return NULL; |
| 3329 | } |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3330 | sector_granularity = granularity >> BDRV_SECTOR_BITS; |
| 3331 | assert(sector_granularity); |
Markus Armbruster | 57322b7 | 2014-06-26 13:23:22 +0200 | [diff] [blame] | 3332 | bitmap_size = bdrv_nb_sectors(bs); |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 3333 | if (bitmap_size < 0) { |
| 3334 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); |
| 3335 | errno = -bitmap_size; |
| 3336 | return NULL; |
| 3337 | } |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3338 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3339 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity)); |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3340 | bitmap->size = bitmap_size; |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3341 | bitmap->name = g_strdup(name); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3342 | bitmap->disabled = false; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3343 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); |
| 3344 | return bitmap; |
| 3345 | } |
| 3346 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3347 | bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) |
| 3348 | { |
| 3349 | return bitmap->successor; |
| 3350 | } |
| 3351 | |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3352 | bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) |
| 3353 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3354 | return !(bitmap->disabled || bitmap->successor); |
| 3355 | } |
| 3356 | |
John Snow | 9abe3bd | 2015-05-12 15:53:01 -0400 | [diff] [blame] | 3357 | DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap) |
| 3358 | { |
| 3359 | if (bdrv_dirty_bitmap_frozen(bitmap)) { |
| 3360 | return DIRTY_BITMAP_STATUS_FROZEN; |
| 3361 | } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
| 3362 | return DIRTY_BITMAP_STATUS_DISABLED; |
| 3363 | } else { |
| 3364 | return DIRTY_BITMAP_STATUS_ACTIVE; |
| 3365 | } |
| 3366 | } |
| 3367 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3368 | /** |
| 3369 | * Create a successor bitmap destined to replace this bitmap after an operation. |
| 3370 | * Requires that the bitmap is not frozen and has no successor. |
| 3371 | */ |
| 3372 | int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, |
| 3373 | BdrvDirtyBitmap *bitmap, Error **errp) |
| 3374 | { |
| 3375 | uint64_t granularity; |
| 3376 | BdrvDirtyBitmap *child; |
| 3377 | |
| 3378 | if (bdrv_dirty_bitmap_frozen(bitmap)) { |
| 3379 | error_setg(errp, "Cannot create a successor for a bitmap that is " |
| 3380 | "currently frozen"); |
| 3381 | return -1; |
| 3382 | } |
| 3383 | assert(!bitmap->successor); |
| 3384 | |
| 3385 | /* Create an anonymous successor */ |
| 3386 | granularity = bdrv_dirty_bitmap_granularity(bitmap); |
| 3387 | child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); |
| 3388 | if (!child) { |
| 3389 | return -1; |
| 3390 | } |
| 3391 | |
| 3392 | /* Successor will be on or off based on our current state. */ |
| 3393 | child->disabled = bitmap->disabled; |
| 3394 | |
| 3395 | /* Install the successor and freeze the parent */ |
| 3396 | bitmap->successor = child; |
| 3397 | return 0; |
| 3398 | } |
| 3399 | |
| 3400 | /** |
| 3401 | * For a bitmap with a successor, yield our name to the successor, |
| 3402 | * delete the old bitmap, and return a handle to the new bitmap. |
| 3403 | */ |
| 3404 | BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, |
| 3405 | BdrvDirtyBitmap *bitmap, |
| 3406 | Error **errp) |
| 3407 | { |
| 3408 | char *name; |
| 3409 | BdrvDirtyBitmap *successor = bitmap->successor; |
| 3410 | |
| 3411 | if (successor == NULL) { |
| 3412 | error_setg(errp, "Cannot relinquish control if " |
| 3413 | "there's no successor present"); |
| 3414 | return NULL; |
| 3415 | } |
| 3416 | |
| 3417 | name = bitmap->name; |
| 3418 | bitmap->name = NULL; |
| 3419 | successor->name = name; |
| 3420 | bitmap->successor = NULL; |
| 3421 | bdrv_release_dirty_bitmap(bs, bitmap); |
| 3422 | |
| 3423 | return successor; |
| 3424 | } |
| 3425 | |
| 3426 | /** |
| 3427 | * In cases of failure where we can no longer safely delete the parent, |
| 3428 | * we may wish to re-join the parent and child/successor. |
| 3429 | * The merged parent will be un-frozen, but not explicitly re-enabled. |
| 3430 | */ |
| 3431 | BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, |
| 3432 | BdrvDirtyBitmap *parent, |
| 3433 | Error **errp) |
| 3434 | { |
| 3435 | BdrvDirtyBitmap *successor = parent->successor; |
| 3436 | |
| 3437 | if (!successor) { |
| 3438 | error_setg(errp, "Cannot reclaim a successor when none is present"); |
| 3439 | return NULL; |
| 3440 | } |
| 3441 | |
| 3442 | if (!hbitmap_merge(parent->bitmap, successor->bitmap)) { |
| 3443 | error_setg(errp, "Merging of parent and successor bitmap failed"); |
| 3444 | return NULL; |
| 3445 | } |
| 3446 | bdrv_release_dirty_bitmap(bs, successor); |
| 3447 | parent->successor = NULL; |
| 3448 | |
| 3449 | return parent; |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3450 | } |
| 3451 | |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3452 | /** |
| 3453 | * Truncates _all_ bitmaps attached to a BDS. |
| 3454 | */ |
| 3455 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) |
| 3456 | { |
| 3457 | BdrvDirtyBitmap *bitmap; |
| 3458 | uint64_t size = bdrv_nb_sectors(bs); |
| 3459 | |
| 3460 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
John Snow | 06207b0 | 2015-06-10 13:24:54 -0400 | [diff] [blame] | 3461 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3462 | hbitmap_truncate(bitmap->bitmap, size); |
John Snow | 5270b6a | 2015-06-08 16:49:15 -0400 | [diff] [blame] | 3463 | bitmap->size = size; |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3464 | } |
| 3465 | } |
| 3466 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3467 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 3468 | { |
| 3469 | BdrvDirtyBitmap *bm, *next; |
| 3470 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { |
| 3471 | if (bm == bitmap) { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3472 | assert(!bdrv_dirty_bitmap_frozen(bm)); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3473 | QLIST_REMOVE(bitmap, list); |
| 3474 | hbitmap_free(bitmap->bitmap); |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3475 | g_free(bitmap->name); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3476 | g_free(bitmap); |
| 3477 | return; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 3478 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3479 | } |
| 3480 | } |
| 3481 | |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3482 | void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
| 3483 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3484 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3485 | bitmap->disabled = true; |
| 3486 | } |
| 3487 | |
| 3488 | void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
| 3489 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3490 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3491 | bitmap->disabled = false; |
| 3492 | } |
| 3493 | |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 3494 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
| 3495 | { |
| 3496 | BdrvDirtyBitmap *bm; |
| 3497 | BlockDirtyInfoList *list = NULL; |
| 3498 | BlockDirtyInfoList **plist = &list; |
| 3499 | |
| 3500 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3501 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
| 3502 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3503 | info->count = bdrv_get_dirty_count(bm); |
John Snow | 592fdd0 | 2015-04-17 19:49:53 -0400 | [diff] [blame] | 3504 | info->granularity = bdrv_dirty_bitmap_granularity(bm); |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3505 | info->has_name = !!bm->name; |
| 3506 | info->name = g_strdup(bm->name); |
John Snow | 9abe3bd | 2015-05-12 15:53:01 -0400 | [diff] [blame] | 3507 | info->status = bdrv_dirty_bitmap_status(bm); |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 3508 | entry->value = info; |
| 3509 | *plist = entry; |
| 3510 | plist = &entry->next; |
| 3511 | } |
| 3512 | |
| 3513 | return list; |
| 3514 | } |
| 3515 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3516 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3517 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3518 | if (bitmap) { |
| 3519 | return hbitmap_get(bitmap->bitmap, sector); |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3520 | } else { |
| 3521 | return 0; |
| 3522 | } |
| 3523 | } |
| 3524 | |
John Snow | 341ebc2 | 2015-04-17 19:49:52 -0400 | [diff] [blame] | 3525 | /** |
| 3526 | * Chooses a default granularity based on the existing cluster size, |
| 3527 | * but clamped between [4K, 64K]. Defaults to 64K in the case that there |
| 3528 | * is no cluster size information available. |
| 3529 | */ |
| 3530 | uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) |
| 3531 | { |
| 3532 | BlockDriverInfo bdi; |
| 3533 | uint32_t granularity; |
| 3534 | |
| 3535 | if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) { |
| 3536 | granularity = MAX(4096, bdi.cluster_size); |
| 3537 | granularity = MIN(65536, granularity); |
| 3538 | } else { |
| 3539 | granularity = 65536; |
| 3540 | } |
| 3541 | |
| 3542 | return granularity; |
| 3543 | } |
| 3544 | |
John Snow | 592fdd0 | 2015-04-17 19:49:53 -0400 | [diff] [blame] | 3545 | uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) |
| 3546 | { |
| 3547 | return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); |
| 3548 | } |
| 3549 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3550 | void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3551 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3552 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3553 | } |
| 3554 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3555 | void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3556 | int64_t cur_sector, int nr_sectors) |
| 3557 | { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3558 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3559 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
| 3560 | } |
| 3561 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3562 | void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3563 | int64_t cur_sector, int nr_sectors) |
| 3564 | { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3565 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3566 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
| 3567 | } |
| 3568 | |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3569 | void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
| 3570 | { |
| 3571 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Wen Congyang | c6a8c32 | 2015-05-22 09:29:46 +0800 | [diff] [blame] | 3572 | hbitmap_reset_all(bitmap->bitmap); |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3573 | } |
| 3574 | |
Stefan Hajnoczi | e0c47b6 | 2015-04-28 14:27:50 +0100 | [diff] [blame] | 3575 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
| 3576 | int nr_sectors) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3577 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3578 | BdrvDirtyBitmap *bitmap; |
| 3579 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3580 | if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
| 3581 | continue; |
| 3582 | } |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3583 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
Paolo Bonzini | 8f0720e | 2013-01-21 17:09:41 +0100 | [diff] [blame] | 3584 | } |
Liran Schour | aaa0eb7 | 2010-01-26 10:31:48 +0200 | [diff] [blame] | 3585 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3586 | |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 3587 | /** |
| 3588 | * Advance an HBitmapIter to an arbitrary offset. |
| 3589 | */ |
| 3590 | void bdrv_set_dirty_iter(HBitmapIter *hbi, int64_t offset) |
| 3591 | { |
| 3592 | assert(hbi->hb); |
| 3593 | hbitmap_iter_init(hbi, hbi->hb, offset); |
| 3594 | } |
| 3595 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3596 | int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3597 | { |
| 3598 | return hbitmap_count(bitmap->bitmap); |
| 3599 | } |
| 3600 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 3601 | /* Get a reference to bs */ |
| 3602 | void bdrv_ref(BlockDriverState *bs) |
| 3603 | { |
| 3604 | bs->refcnt++; |
| 3605 | } |
| 3606 | |
| 3607 | /* Release a previously grabbed reference to bs. |
| 3608 | * If after releasing, reference count is zero, the BlockDriverState is |
| 3609 | * deleted. */ |
| 3610 | void bdrv_unref(BlockDriverState *bs) |
| 3611 | { |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 3612 | if (!bs) { |
| 3613 | return; |
| 3614 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 3615 | assert(bs->refcnt > 0); |
| 3616 | if (--bs->refcnt == 0) { |
| 3617 | bdrv_delete(bs); |
| 3618 | } |
| 3619 | } |
| 3620 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3621 | struct BdrvOpBlocker { |
| 3622 | Error *reason; |
| 3623 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 3624 | }; |
| 3625 | |
| 3626 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 3627 | { |
| 3628 | BdrvOpBlocker *blocker; |
| 3629 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3630 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 3631 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
| 3632 | if (errp) { |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 3633 | error_setg(errp, "Node '%s' is busy: %s", |
| 3634 | bdrv_get_device_or_node_name(bs), |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3635 | error_get_pretty(blocker->reason)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3636 | } |
| 3637 | return true; |
| 3638 | } |
| 3639 | return false; |
| 3640 | } |
| 3641 | |
| 3642 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 3643 | { |
| 3644 | BdrvOpBlocker *blocker; |
| 3645 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3646 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3647 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3648 | blocker->reason = reason; |
| 3649 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 3650 | } |
| 3651 | |
| 3652 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 3653 | { |
| 3654 | BdrvOpBlocker *blocker, *next; |
| 3655 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3656 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 3657 | if (blocker->reason == reason) { |
| 3658 | QLIST_REMOVE(blocker, list); |
| 3659 | g_free(blocker); |
| 3660 | } |
| 3661 | } |
| 3662 | } |
| 3663 | |
| 3664 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 3665 | { |
| 3666 | int i; |
| 3667 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3668 | bdrv_op_block(bs, i, reason); |
| 3669 | } |
| 3670 | } |
| 3671 | |
| 3672 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 3673 | { |
| 3674 | int i; |
| 3675 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3676 | bdrv_op_unblock(bs, i, reason); |
| 3677 | } |
| 3678 | } |
| 3679 | |
| 3680 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 3681 | { |
| 3682 | int i; |
| 3683 | |
| 3684 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3685 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 3686 | return false; |
| 3687 | } |
| 3688 | } |
| 3689 | return true; |
| 3690 | } |
| 3691 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3692 | void bdrv_iostatus_enable(BlockDriverState *bs) |
| 3693 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 3694 | bs->iostatus_enabled = true; |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 3695 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3696 | } |
| 3697 | |
| 3698 | /* The I/O status is only enabled if the drive explicitly |
| 3699 | * enables it _and_ the VM is configured to stop on errors */ |
| 3700 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
| 3701 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 3702 | return (bs->iostatus_enabled && |
Paolo Bonzini | 92aa5c6 | 2012-09-28 17:22:55 +0200 | [diff] [blame] | 3703 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
| 3704 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || |
| 3705 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3706 | } |
| 3707 | |
| 3708 | void bdrv_iostatus_disable(BlockDriverState *bs) |
| 3709 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 3710 | bs->iostatus_enabled = false; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3711 | } |
| 3712 | |
| 3713 | void bdrv_iostatus_reset(BlockDriverState *bs) |
| 3714 | { |
| 3715 | if (bdrv_iostatus_is_enabled(bs)) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 3716 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Paolo Bonzini | 3bd293c | 2012-10-18 16:49:27 +0200 | [diff] [blame] | 3717 | if (bs->job) { |
| 3718 | block_job_iostatus_reset(bs->job); |
| 3719 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3720 | } |
| 3721 | } |
| 3722 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3723 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
| 3724 | { |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3725 | assert(bdrv_iostatus_is_enabled(bs)); |
| 3726 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 3727 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
| 3728 | BLOCK_DEVICE_IO_STATUS_FAILED; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 3729 | } |
| 3730 | } |
| 3731 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3732 | void bdrv_img_create(const char *filename, const char *fmt, |
| 3733 | const char *base_filename, const char *base_fmt, |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 3734 | char *options, uint64_t img_size, int flags, |
| 3735 | Error **errp, bool quiet) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3736 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3737 | QemuOptsList *create_opts = NULL; |
| 3738 | QemuOpts *opts = NULL; |
| 3739 | const char *backing_fmt, *backing_file; |
| 3740 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3741 | BlockDriver *drv, *proto_drv; |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 3742 | BlockDriver *backing_drv = NULL; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3743 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3744 | int ret = 0; |
| 3745 | |
| 3746 | /* Find driver and parse its options */ |
| 3747 | drv = bdrv_find_format(fmt); |
| 3748 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3749 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3750 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3751 | } |
| 3752 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 3753 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3754 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3755 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3756 | } |
| 3757 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 3758 | if (!drv->create_opts) { |
| 3759 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 3760 | drv->format_name); |
| 3761 | return; |
| 3762 | } |
| 3763 | |
| 3764 | if (!proto_drv->create_opts) { |
| 3765 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 3766 | proto_drv->format_name); |
| 3767 | return; |
| 3768 | } |
| 3769 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3770 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 3771 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3772 | |
| 3773 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3774 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3775 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3776 | |
| 3777 | /* Parse -o options */ |
| 3778 | if (options) { |
Markus Armbruster | dc523cd34 | 2015-02-12 18:37:11 +0100 | [diff] [blame] | 3779 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
| 3780 | if (local_err) { |
| 3781 | error_report_err(local_err); |
| 3782 | local_err = NULL; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3783 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3784 | goto out; |
| 3785 | } |
| 3786 | } |
| 3787 | |
| 3788 | if (base_filename) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 3789 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 3790 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3791 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 3792 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3793 | goto out; |
| 3794 | } |
| 3795 | } |
| 3796 | |
| 3797 | if (base_fmt) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 3798 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 3799 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3800 | error_setg(errp, "Backing file format not supported for file " |
| 3801 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3802 | goto out; |
| 3803 | } |
| 3804 | } |
| 3805 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3806 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 3807 | if (backing_file) { |
| 3808 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3809 | error_setg(errp, "Error: Trying to create an image with the " |
| 3810 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 3811 | goto out; |
| 3812 | } |
| 3813 | } |
| 3814 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3815 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
| 3816 | if (backing_fmt) { |
| 3817 | backing_drv = bdrv_find_format(backing_fmt); |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 3818 | if (!backing_drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3819 | error_setg(errp, "Unknown backing file format '%s'", |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3820 | backing_fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3821 | goto out; |
| 3822 | } |
| 3823 | } |
| 3824 | |
| 3825 | // The size for the image must always be specified, with one exception: |
| 3826 | // If we are using a backing file, we can obtain the size from there |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3827 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
| 3828 | if (size == -1) { |
| 3829 | if (backing_file) { |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 3830 | BlockDriverState *bs; |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3831 | char *full_backing = g_new0(char, PATH_MAX); |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 3832 | int64_t size; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 3833 | int back_flags; |
| 3834 | |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3835 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 3836 | full_backing, PATH_MAX, |
| 3837 | &local_err); |
| 3838 | if (local_err) { |
| 3839 | g_free(full_backing); |
| 3840 | goto out; |
| 3841 | } |
| 3842 | |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 3843 | /* backing files always opened read-only */ |
| 3844 | back_flags = |
| 3845 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3846 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3847 | bs = NULL; |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3848 | ret = bdrv_open(&bs, full_backing, NULL, NULL, back_flags, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3849 | backing_drv, &local_err); |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3850 | g_free(full_backing); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3851 | if (ret < 0) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3852 | goto out; |
| 3853 | } |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 3854 | size = bdrv_getlength(bs); |
| 3855 | if (size < 0) { |
| 3856 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 3857 | backing_file); |
| 3858 | bdrv_unref(bs); |
| 3859 | goto out; |
| 3860 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3861 | |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3862 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 3863 | |
| 3864 | bdrv_unref(bs); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3865 | } else { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3866 | error_setg(errp, "Image creation needs a size parameter"); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3867 | goto out; |
| 3868 | } |
| 3869 | } |
| 3870 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 3871 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 3872 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 3873 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 3874 | puts(""); |
| 3875 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3876 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3877 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3878 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3879 | if (ret == -EFBIG) { |
| 3880 | /* This is generally a better message than whatever the driver would |
| 3881 | * deliver (especially because of the cluster_size_hint), since that |
| 3882 | * is most probably not much different from "image too large". */ |
| 3883 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3884 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3885 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3886 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3887 | error_setg(errp, "The image size is too large for file format '%s'" |
| 3888 | "%s", fmt, cluster_size_hint); |
| 3889 | error_free(local_err); |
| 3890 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3891 | } |
| 3892 | |
| 3893 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3894 | qemu_opts_del(opts); |
| 3895 | qemu_opts_free(create_opts); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 3896 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3897 | error_propagate(errp, local_err); |
| 3898 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3899 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 3900 | |
| 3901 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 3902 | { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3903 | return bs->aio_context; |
| 3904 | } |
| 3905 | |
| 3906 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 3907 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3908 | BdrvAioNotifier *baf; |
| 3909 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3910 | if (!bs->drv) { |
| 3911 | return; |
| 3912 | } |
| 3913 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3914 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
| 3915 | baf->detach_aio_context(baf->opaque); |
| 3916 | } |
| 3917 | |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 3918 | if (bs->io_limits_enabled) { |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 3919 | throttle_timers_detach_aio_context(&bs->throttle_timers); |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 3920 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3921 | if (bs->drv->bdrv_detach_aio_context) { |
| 3922 | bs->drv->bdrv_detach_aio_context(bs); |
| 3923 | } |
| 3924 | if (bs->file) { |
| 3925 | bdrv_detach_aio_context(bs->file); |
| 3926 | } |
| 3927 | if (bs->backing_hd) { |
| 3928 | bdrv_detach_aio_context(bs->backing_hd); |
| 3929 | } |
| 3930 | |
| 3931 | bs->aio_context = NULL; |
| 3932 | } |
| 3933 | |
| 3934 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 3935 | AioContext *new_context) |
| 3936 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3937 | BdrvAioNotifier *ban; |
| 3938 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3939 | if (!bs->drv) { |
| 3940 | return; |
| 3941 | } |
| 3942 | |
| 3943 | bs->aio_context = new_context; |
| 3944 | |
| 3945 | if (bs->backing_hd) { |
| 3946 | bdrv_attach_aio_context(bs->backing_hd, new_context); |
| 3947 | } |
| 3948 | if (bs->file) { |
| 3949 | bdrv_attach_aio_context(bs->file, new_context); |
| 3950 | } |
| 3951 | if (bs->drv->bdrv_attach_aio_context) { |
| 3952 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 3953 | } |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 3954 | if (bs->io_limits_enabled) { |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 3955 | throttle_timers_attach_aio_context(&bs->throttle_timers, new_context); |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 3956 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3957 | |
| 3958 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { |
| 3959 | ban->attached_aio_context(new_context, ban->opaque); |
| 3960 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3961 | } |
| 3962 | |
| 3963 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 3964 | { |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 3965 | bdrv_drain(bs); /* ensure there are no in-flight requests */ |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 3966 | |
| 3967 | bdrv_detach_aio_context(bs); |
| 3968 | |
| 3969 | /* This function executes in the old AioContext so acquire the new one in |
| 3970 | * case it runs in a different thread. |
| 3971 | */ |
| 3972 | aio_context_acquire(new_context); |
| 3973 | bdrv_attach_aio_context(bs, new_context); |
| 3974 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 3975 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 3976 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 3977 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 3978 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 3979 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 3980 | { |
| 3981 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 3982 | *ban = (BdrvAioNotifier){ |
| 3983 | .attached_aio_context = attached_aio_context, |
| 3984 | .detach_aio_context = detach_aio_context, |
| 3985 | .opaque = opaque |
| 3986 | }; |
| 3987 | |
| 3988 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 3989 | } |
| 3990 | |
| 3991 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 3992 | void (*attached_aio_context)(AioContext *, |
| 3993 | void *), |
| 3994 | void (*detach_aio_context)(void *), |
| 3995 | void *opaque) |
| 3996 | { |
| 3997 | BdrvAioNotifier *ban, *ban_next; |
| 3998 | |
| 3999 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 4000 | if (ban->attached_aio_context == attached_aio_context && |
| 4001 | ban->detach_aio_context == detach_aio_context && |
| 4002 | ban->opaque == opaque) |
| 4003 | { |
| 4004 | QLIST_REMOVE(ban, list); |
| 4005 | g_free(ban); |
| 4006 | |
| 4007 | return; |
| 4008 | } |
| 4009 | } |
| 4010 | |
| 4011 | abort(); |
| 4012 | } |
| 4013 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 4014 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
| 4015 | BlockDriverAmendStatusCB *status_cb) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4016 | { |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 4017 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4018 | return -ENOTSUP; |
| 4019 | } |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 4020 | return bs->drv->bdrv_amend_options(bs, opts, status_cb); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4021 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4022 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4023 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 4024 | * of block filter and by bdrv_is_first_non_filter. |
| 4025 | * It is used to test if the given bs is the candidate or recurse more in the |
| 4026 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4027 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4028 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 4029 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4030 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4031 | /* return false if basic checks fails */ |
| 4032 | if (!bs || !bs->drv) { |
| 4033 | return false; |
| 4034 | } |
| 4035 | |
| 4036 | /* the code reached a non block filter driver -> check if the bs is |
| 4037 | * the same as the candidate. It's the recursion termination condition. |
| 4038 | */ |
| 4039 | if (!bs->drv->is_filter) { |
| 4040 | return bs == candidate; |
| 4041 | } |
| 4042 | /* Down this path the driver is a block filter driver */ |
| 4043 | |
| 4044 | /* If the block filter recursion method is defined use it to recurse down |
| 4045 | * the node graph. |
| 4046 | */ |
| 4047 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4048 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 4049 | } |
| 4050 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4051 | /* the driver is a block filter but don't allow to recurse -> return false |
| 4052 | */ |
| 4053 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4054 | } |
| 4055 | |
| 4056 | /* This function checks if the candidate is the first non filter bs down it's |
| 4057 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 4058 | * from the top. Some filters can choose not to pass down the recursion. |
| 4059 | */ |
| 4060 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 4061 | { |
| 4062 | BlockDriverState *bs; |
| 4063 | |
| 4064 | /* walk down the bs forest recursively */ |
| 4065 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 4066 | bool perm; |
| 4067 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4068 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 4069 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4070 | |
| 4071 | /* candidate is the first non filter */ |
| 4072 | if (perm) { |
| 4073 | return true; |
| 4074 | } |
| 4075 | } |
| 4076 | |
| 4077 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4078 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4079 | |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 4080 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 4081 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4082 | { |
| 4083 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4084 | AioContext *aio_context; |
| 4085 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4086 | if (!to_replace_bs) { |
| 4087 | error_setg(errp, "Node name '%s' not found", node_name); |
| 4088 | return NULL; |
| 4089 | } |
| 4090 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4091 | aio_context = bdrv_get_aio_context(to_replace_bs); |
| 4092 | aio_context_acquire(aio_context); |
| 4093 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4094 | 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] | 4095 | to_replace_bs = NULL; |
| 4096 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4097 | } |
| 4098 | |
| 4099 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 4100 | * most non filter in order to prevent data corruption. |
| 4101 | * Another benefit is that this tests exclude backing files which are |
| 4102 | * blocked by the backing blockers. |
| 4103 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 4104 | if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4105 | error_setg(errp, "Only top most non filter can be replaced"); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4106 | to_replace_bs = NULL; |
| 4107 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4108 | } |
| 4109 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4110 | out: |
| 4111 | aio_context_release(aio_context); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4112 | return to_replace_bs; |
| 4113 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 4114 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4115 | static bool append_open_options(QDict *d, BlockDriverState *bs) |
| 4116 | { |
| 4117 | const QDictEntry *entry; |
| 4118 | bool found_any = false; |
| 4119 | |
| 4120 | for (entry = qdict_first(bs->options); entry; |
| 4121 | entry = qdict_next(bs->options, entry)) |
| 4122 | { |
| 4123 | /* Only take options for this level and exclude all non-driver-specific |
| 4124 | * options */ |
| 4125 | if (!strchr(qdict_entry_key(entry), '.') && |
| 4126 | strcmp(qdict_entry_key(entry), "node-name")) |
| 4127 | { |
| 4128 | qobject_incref(qdict_entry_value(entry)); |
| 4129 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); |
| 4130 | found_any = true; |
| 4131 | } |
| 4132 | } |
| 4133 | |
| 4134 | return found_any; |
| 4135 | } |
| 4136 | |
| 4137 | /* Updates the following BDS fields: |
| 4138 | * - exact_filename: A filename which may be used for opening a block device |
| 4139 | * which (mostly) equals the given BDS (even without any |
| 4140 | * other options; so reading and writing must return the same |
| 4141 | * results, but caching etc. may be different) |
| 4142 | * - full_open_options: Options which, when given when opening a block device |
| 4143 | * (without a filename), result in a BDS (mostly) |
| 4144 | * equalling the given one |
| 4145 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 4146 | * full_open_options is converted to a JSON object, prefixed with |
| 4147 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 4148 | */ |
| 4149 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 4150 | { |
| 4151 | BlockDriver *drv = bs->drv; |
| 4152 | QDict *opts; |
| 4153 | |
| 4154 | if (!drv) { |
| 4155 | return; |
| 4156 | } |
| 4157 | |
| 4158 | /* This BDS's file name will most probably depend on its file's name, so |
| 4159 | * refresh that first */ |
| 4160 | if (bs->file) { |
| 4161 | bdrv_refresh_filename(bs->file); |
| 4162 | } |
| 4163 | |
| 4164 | if (drv->bdrv_refresh_filename) { |
| 4165 | /* Obsolete information is of no use here, so drop the old file name |
| 4166 | * information before refreshing it */ |
| 4167 | bs->exact_filename[0] = '\0'; |
| 4168 | if (bs->full_open_options) { |
| 4169 | QDECREF(bs->full_open_options); |
| 4170 | bs->full_open_options = NULL; |
| 4171 | } |
| 4172 | |
| 4173 | drv->bdrv_refresh_filename(bs); |
| 4174 | } else if (bs->file) { |
| 4175 | /* Try to reconstruct valid information from the underlying file */ |
| 4176 | bool has_open_options; |
| 4177 | |
| 4178 | bs->exact_filename[0] = '\0'; |
| 4179 | if (bs->full_open_options) { |
| 4180 | QDECREF(bs->full_open_options); |
| 4181 | bs->full_open_options = NULL; |
| 4182 | } |
| 4183 | |
| 4184 | opts = qdict_new(); |
| 4185 | has_open_options = append_open_options(opts, bs); |
| 4186 | |
| 4187 | /* If no specific options have been given for this BDS, the filename of |
| 4188 | * the underlying file should suffice for this one as well */ |
| 4189 | if (bs->file->exact_filename[0] && !has_open_options) { |
| 4190 | strcpy(bs->exact_filename, bs->file->exact_filename); |
| 4191 | } |
| 4192 | /* Reconstructing the full options QDict is simple for most format block |
| 4193 | * drivers, as long as the full options are known for the underlying |
| 4194 | * file BDS. The full options QDict of that file BDS should somehow |
| 4195 | * contain a representation of the filename, therefore the following |
| 4196 | * suffices without querying the (exact_)filename of this BDS. */ |
| 4197 | if (bs->file->full_open_options) { |
| 4198 | qdict_put_obj(opts, "driver", |
| 4199 | QOBJECT(qstring_from_str(drv->format_name))); |
| 4200 | QINCREF(bs->file->full_open_options); |
| 4201 | qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); |
| 4202 | |
| 4203 | bs->full_open_options = opts; |
| 4204 | } else { |
| 4205 | QDECREF(opts); |
| 4206 | } |
| 4207 | } else if (!bs->full_open_options && qdict_size(bs->options)) { |
| 4208 | /* There is no underlying file BDS (at least referenced by BDS.file), |
| 4209 | * so the full options QDict should be equal to the options given |
| 4210 | * specifically for this block device when it was opened (plus the |
| 4211 | * driver specification). |
| 4212 | * Because those options don't change, there is no need to update |
| 4213 | * full_open_options when it's already set. */ |
| 4214 | |
| 4215 | opts = qdict_new(); |
| 4216 | append_open_options(opts, bs); |
| 4217 | qdict_put_obj(opts, "driver", |
| 4218 | QOBJECT(qstring_from_str(drv->format_name))); |
| 4219 | |
| 4220 | if (bs->exact_filename[0]) { |
| 4221 | /* This may not work for all block protocol drivers (some may |
| 4222 | * require this filename to be parsed), but we have to find some |
| 4223 | * default solution here, so just include it. If some block driver |
| 4224 | * does not support pure options without any filename at all or |
| 4225 | * needs some special format of the options QDict, it needs to |
| 4226 | * implement the driver-specific bdrv_refresh_filename() function. |
| 4227 | */ |
| 4228 | qdict_put_obj(opts, "filename", |
| 4229 | QOBJECT(qstring_from_str(bs->exact_filename))); |
| 4230 | } |
| 4231 | |
| 4232 | bs->full_open_options = opts; |
| 4233 | } |
| 4234 | |
| 4235 | if (bs->exact_filename[0]) { |
| 4236 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
| 4237 | } else if (bs->full_open_options) { |
| 4238 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
| 4239 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
| 4240 | qstring_get_str(json)); |
| 4241 | QDECREF(json); |
| 4242 | } |
| 4243 | } |
Benoît Canet | 5366d0c | 2014-09-05 15:46:18 +0200 | [diff] [blame] | 4244 | |
| 4245 | /* This accessor function purpose is to allow the device models to access the |
| 4246 | * BlockAcctStats structure embedded inside a BlockDriverState without being |
| 4247 | * aware of the BlockDriverState structure layout. |
| 4248 | * It will go away when the BlockAcctStats structure will be moved inside |
| 4249 | * the device models. |
| 4250 | */ |
| 4251 | BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) |
| 4252 | { |
| 4253 | return &bs->stats; |
| 4254 | } |