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 | */ |
Peter Maydell | d38ea87 | 2016-01-29 17:50:05 +0000 | [diff] [blame] | 24 | #include "qemu/osdep.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" |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 32 | #include "qapi/qmp/qbool.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 33 | #include "qapi/qmp/qjson.h" |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 34 | #include "sysemu/block-backend.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 35 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 36 | #include "qemu/notify.h" |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 37 | #include "qemu/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 38 | #include "block/qapi.h" |
Luiz Capitulino | b202381 | 2011-09-21 17:16:47 -0300 | [diff] [blame] | 39 | #include "qmp-commands.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 40 | #include "qemu/timer.h" |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 41 | #include "qapi-event.h" |
Alberto Garcia | db62833 | 2015-06-08 18:17:45 +0200 | [diff] [blame] | 42 | #include "block/throttle-groups.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 43 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 44 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 45 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 46 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 47 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 48 | #include <sys/disk.h> |
| 49 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 50 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 51 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 52 | #ifdef _WIN32 |
| 53 | #include <windows.h> |
| 54 | #endif |
| 55 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 56 | /** |
| 57 | * A BdrvDirtyBitmap can be in three possible states: |
| 58 | * (1) successor is NULL and disabled is false: full r/w mode |
| 59 | * (2) successor is NULL and disabled is true: read only mode ("disabled") |
| 60 | * (3) successor is set: frozen mode. |
| 61 | * A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set, |
| 62 | * or enabled. A frozen bitmap can only abdicate() or reclaim(). |
| 63 | */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 64 | struct BdrvDirtyBitmap { |
John Snow | aa0c7ca | 2015-04-17 19:50:01 -0400 | [diff] [blame] | 65 | HBitmap *bitmap; /* Dirty sector bitmap implementation */ |
| 66 | BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ |
| 67 | char *name; /* Optional non-empty unique ID */ |
| 68 | int64_t size; /* Size of the bitmap (Number of sectors) */ |
| 69 | bool disabled; /* Bitmap is read-only */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 70 | QLIST_ENTRY(BdrvDirtyBitmap) list; |
| 71 | }; |
| 72 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 73 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 74 | |
Max Reitz | c69a4dd | 2015-10-26 21:39:06 +0100 | [diff] [blame] | 75 | struct BdrvStates bdrv_states = QTAILQ_HEAD_INITIALIZER(bdrv_states); |
blueswir1 | 7ee930d | 2008-09-17 19:04:14 +0000 | [diff] [blame] | 76 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 77 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 78 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 79 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 80 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
| 81 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); |
| 82 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 83 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 84 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 85 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 86 | static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, |
| 87 | const char *reference, QDict *options, int flags, |
| 88 | BlockDriverState *parent, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 89 | const BdrvChildRole *child_role, Error **errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 90 | |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 91 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 92 | static void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs); |
| 93 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 94 | /* If non-zero, use only whitelisted block drivers */ |
| 95 | static int use_bdrv_whitelist; |
| 96 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 97 | static void bdrv_close(BlockDriverState *bs); |
| 98 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 99 | #ifdef _WIN32 |
| 100 | static int is_windows_drive_prefix(const char *filename) |
| 101 | { |
| 102 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 103 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 104 | filename[1] == ':'); |
| 105 | } |
| 106 | |
| 107 | int is_windows_drive(const char *filename) |
| 108 | { |
| 109 | if (is_windows_drive_prefix(filename) && |
| 110 | filename[2] == '\0') |
| 111 | return 1; |
| 112 | if (strstart(filename, "\\\\.\\", NULL) || |
| 113 | strstart(filename, "//./", NULL)) |
| 114 | return 1; |
| 115 | return 0; |
| 116 | } |
| 117 | #endif |
| 118 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 119 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 120 | { |
| 121 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 122 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 123 | return MAX(4096, getpagesize()); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | return bs->bl.opt_mem_alignment; |
| 127 | } |
| 128 | |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 129 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
| 130 | { |
| 131 | if (!bs || !bs->drv) { |
Denis V. Lunev | 459b4e6 | 2015-05-12 17:30:56 +0300 | [diff] [blame] | 132 | /* page size or 4k (hdd sector size) should be on the safe side */ |
| 133 | return MAX(4096, getpagesize()); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | return bs->bl.min_mem_alignment; |
| 137 | } |
| 138 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 139 | /* check if the path starts with "<protocol>:" */ |
Max Reitz | 5c98415 | 2014-12-03 14:57:22 +0100 | [diff] [blame] | 140 | int path_has_protocol(const char *path) |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 141 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 142 | const char *p; |
| 143 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 144 | #ifdef _WIN32 |
| 145 | if (is_windows_drive(path) || |
| 146 | is_windows_drive_prefix(path)) { |
| 147 | return 0; |
| 148 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 149 | p = path + strcspn(path, ":/\\"); |
| 150 | #else |
| 151 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 152 | #endif |
| 153 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 154 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 155 | } |
| 156 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 157 | int path_is_absolute(const char *path) |
| 158 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 159 | #ifdef _WIN32 |
| 160 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 161 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 162 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 163 | } |
| 164 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 165 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 166 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 167 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 171 | path to it by considering it is relative to base_path. URL are |
| 172 | supported. */ |
| 173 | void path_combine(char *dest, int dest_size, |
| 174 | const char *base_path, |
| 175 | const char *filename) |
| 176 | { |
| 177 | const char *p, *p1; |
| 178 | int len; |
| 179 | |
| 180 | if (dest_size <= 0) |
| 181 | return; |
| 182 | if (path_is_absolute(filename)) { |
| 183 | pstrcpy(dest, dest_size, filename); |
| 184 | } else { |
| 185 | p = strchr(base_path, ':'); |
| 186 | if (p) |
| 187 | p++; |
| 188 | else |
| 189 | p = base_path; |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 190 | p1 = strrchr(base_path, '/'); |
| 191 | #ifdef _WIN32 |
| 192 | { |
| 193 | const char *p2; |
| 194 | p2 = strrchr(base_path, '\\'); |
| 195 | if (!p1 || p2 > p1) |
| 196 | p1 = p2; |
| 197 | } |
| 198 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 199 | if (p1) |
| 200 | p1++; |
| 201 | else |
| 202 | p1 = base_path; |
| 203 | if (p1 > p) |
| 204 | p = p1; |
| 205 | len = p - base_path; |
| 206 | if (len > dest_size - 1) |
| 207 | len = dest_size - 1; |
| 208 | memcpy(dest, base_path, len); |
| 209 | dest[len] = '\0'; |
| 210 | pstrcat(dest, dest_size, filename); |
| 211 | } |
| 212 | } |
| 213 | |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 214 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
| 215 | const char *backing, |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 216 | char *dest, size_t sz, |
| 217 | Error **errp) |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 218 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 219 | if (backing[0] == '\0' || path_has_protocol(backing) || |
| 220 | path_is_absolute(backing)) |
| 221 | { |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 222 | pstrcpy(dest, sz, backing); |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 223 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
| 224 | error_setg(errp, "Cannot use relative backing file names for '%s'", |
| 225 | backed); |
Max Reitz | 0a82855 | 2014-11-26 17:20:25 +0100 | [diff] [blame] | 226 | } else { |
| 227 | path_combine(dest, sz, backed, backing); |
| 228 | } |
| 229 | } |
| 230 | |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 231 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
| 232 | Error **errp) |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 233 | { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 234 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
| 235 | |
| 236 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, |
| 237 | dest, sz, errp); |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 238 | } |
| 239 | |
Stefan Hajnoczi | 0eb7217 | 2015-04-28 14:27:51 +0100 | [diff] [blame] | 240 | void bdrv_register(BlockDriver *bdrv) |
| 241 | { |
| 242 | bdrv_setup_io_funcs(bdrv); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 243 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 244 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 245 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 246 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 247 | BlockDriverState *bdrv_new_root(void) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 248 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 249 | BlockDriverState *bs = bdrv_new(); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 250 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 251 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 252 | return bs; |
| 253 | } |
| 254 | |
| 255 | BlockDriverState *bdrv_new(void) |
| 256 | { |
| 257 | BlockDriverState *bs; |
| 258 | int i; |
| 259 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 260 | bs = g_new0(BlockDriverState, 1); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 261 | QLIST_INIT(&bs->dirty_bitmaps); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 262 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 263 | QLIST_INIT(&bs->op_blockers[i]); |
| 264 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 265 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 266 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
| 267 | qemu_co_queue_init(&bs->throttled_reqs[1]); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 268 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 269 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 270 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 271 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
| 272 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 273 | return bs; |
| 274 | } |
| 275 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 276 | BlockDriver *bdrv_find_format(const char *format_name) |
| 277 | { |
| 278 | BlockDriver *drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 279 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 280 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 281 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 282 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 283 | } |
| 284 | return NULL; |
| 285 | } |
| 286 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 287 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 288 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 289 | static const char *whitelist_rw[] = { |
| 290 | CONFIG_BDRV_RW_WHITELIST |
| 291 | }; |
| 292 | static const char *whitelist_ro[] = { |
| 293 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 294 | }; |
| 295 | const char **p; |
| 296 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 297 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 298 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 299 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 300 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 301 | for (p = whitelist_rw; *p; p++) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 302 | if (!strcmp(drv->format_name, *p)) { |
| 303 | return 1; |
| 304 | } |
| 305 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 306 | if (read_only) { |
| 307 | for (p = whitelist_ro; *p; p++) { |
| 308 | if (!strcmp(drv->format_name, *p)) { |
| 309 | return 1; |
| 310 | } |
| 311 | } |
| 312 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 313 | return 0; |
| 314 | } |
| 315 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 316 | typedef struct CreateCo { |
| 317 | BlockDriver *drv; |
| 318 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 319 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 320 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 321 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 322 | } CreateCo; |
| 323 | |
| 324 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 325 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 326 | Error *local_err = NULL; |
| 327 | int ret; |
| 328 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 329 | CreateCo *cco = opaque; |
| 330 | assert(cco->drv); |
| 331 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 332 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 333 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 334 | error_propagate(&cco->err, local_err); |
| 335 | } |
| 336 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 337 | } |
| 338 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 339 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 340 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 341 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 342 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 343 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 344 | Coroutine *co; |
| 345 | CreateCo cco = { |
| 346 | .drv = drv, |
| 347 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 348 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 349 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 350 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 351 | }; |
| 352 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 353 | if (!drv->bdrv_create) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 354 | 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] | 355 | ret = -ENOTSUP; |
| 356 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | if (qemu_in_coroutine()) { |
| 360 | /* Fast-path if already in coroutine context */ |
| 361 | bdrv_create_co_entry(&cco); |
| 362 | } else { |
| 363 | co = qemu_coroutine_create(bdrv_create_co_entry); |
| 364 | qemu_coroutine_enter(co, &cco); |
| 365 | while (cco.ret == NOT_DONE) { |
Paolo Bonzini | b47ec2c | 2014-07-07 15:18:01 +0200 | [diff] [blame] | 366 | aio_poll(qemu_get_aio_context(), true); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 367 | } |
| 368 | } |
| 369 | |
| 370 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 371 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 372 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 373 | error_propagate(errp, cco.err); |
| 374 | } else { |
| 375 | error_setg_errno(errp, -ret, "Could not create image"); |
| 376 | } |
| 377 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 378 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 379 | out: |
| 380 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 381 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 382 | } |
| 383 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 384 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 385 | { |
| 386 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 387 | Error *local_err = NULL; |
| 388 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 389 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 390 | drv = bdrv_find_protocol(filename, true, errp); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 391 | if (drv == NULL) { |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 392 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 393 | } |
| 394 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 395 | ret = bdrv_create(drv, filename, opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 396 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 397 | error_propagate(errp, local_err); |
| 398 | } |
| 399 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 400 | } |
| 401 | |
Ekaterina Tumanova | 892b7de | 2015-02-16 12:47:54 +0100 | [diff] [blame] | 402 | /** |
| 403 | * Try to get @bs's logical and physical block size. |
| 404 | * On success, store them in @bsz struct and return 0. |
| 405 | * On failure return -errno. |
| 406 | * @bs must not be empty. |
| 407 | */ |
| 408 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 409 | { |
| 410 | BlockDriver *drv = bs->drv; |
| 411 | |
| 412 | if (drv && drv->bdrv_probe_blocksizes) { |
| 413 | return drv->bdrv_probe_blocksizes(bs, bsz); |
| 414 | } |
| 415 | |
| 416 | return -ENOTSUP; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * Try to get @bs's geometry (cyls, heads, sectors). |
| 421 | * On success, store them in @geo struct and return 0. |
| 422 | * On failure return -errno. |
| 423 | * @bs must not be empty. |
| 424 | */ |
| 425 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 426 | { |
| 427 | BlockDriver *drv = bs->drv; |
| 428 | |
| 429 | if (drv && drv->bdrv_probe_geometry) { |
| 430 | return drv->bdrv_probe_geometry(bs, geo); |
| 431 | } |
| 432 | |
| 433 | return -ENOTSUP; |
| 434 | } |
| 435 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 436 | /* |
| 437 | * Create a uniquely-named empty temporary file. |
| 438 | * Return 0 upon success, otherwise a negative errno value. |
| 439 | */ |
| 440 | int get_tmp_filename(char *filename, int size) |
| 441 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 442 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 443 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 444 | /* GetTempFileName requires that its output buffer (4th param) |
| 445 | have length MAX_PATH or greater. */ |
| 446 | assert(size >= MAX_PATH); |
| 447 | return (GetTempPath(MAX_PATH, temp_dir) |
| 448 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 449 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 450 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 451 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 452 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 453 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 454 | if (!tmpdir) { |
| 455 | tmpdir = "/var/tmp"; |
| 456 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 457 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 458 | return -EOVERFLOW; |
| 459 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 460 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 461 | if (fd < 0) { |
| 462 | return -errno; |
| 463 | } |
| 464 | if (close(fd) != 0) { |
| 465 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 466 | return -errno; |
| 467 | } |
| 468 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 469 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 470 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 471 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 472 | /* |
| 473 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 474 | * recognized as a host CDROM. |
| 475 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 476 | static BlockDriver *find_hdev_driver(const char *filename) |
| 477 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 478 | int score_max = 0, score; |
| 479 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 480 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 481 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 482 | if (d->bdrv_probe_device) { |
| 483 | score = d->bdrv_probe_device(filename); |
| 484 | if (score > score_max) { |
| 485 | score_max = score; |
| 486 | drv = d; |
| 487 | } |
| 488 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 489 | } |
| 490 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 491 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 492 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 493 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 494 | BlockDriver *bdrv_find_protocol(const char *filename, |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 495 | bool allow_protocol_prefix, |
| 496 | Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 497 | { |
| 498 | BlockDriver *drv1; |
| 499 | char protocol[128]; |
| 500 | int len; |
| 501 | const char *p; |
| 502 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 503 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 504 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 505 | /* |
| 506 | * XXX(hch): we really should not let host device detection |
| 507 | * override an explicit protocol specification, but moving this |
| 508 | * later breaks access to device names with colons in them. |
| 509 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 510 | * based Linux systems those actually are quite common. |
| 511 | */ |
| 512 | drv1 = find_hdev_driver(filename); |
| 513 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 514 | return drv1; |
| 515 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 516 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 517 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 518 | return &bdrv_file; |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 519 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 520 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 521 | p = strchr(filename, ':'); |
| 522 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 523 | len = p - filename; |
| 524 | if (len > sizeof(protocol) - 1) |
| 525 | len = sizeof(protocol) - 1; |
| 526 | memcpy(protocol, filename, len); |
| 527 | protocol[len] = '\0'; |
| 528 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 529 | if (drv1->protocol_name && |
| 530 | !strcmp(drv1->protocol_name, protocol)) { |
| 531 | return drv1; |
| 532 | } |
| 533 | } |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 534 | |
| 535 | error_setg(errp, "Unknown protocol '%s'", protocol); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 536 | return NULL; |
| 537 | } |
| 538 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 539 | /* |
| 540 | * Guess image format by probing its contents. |
| 541 | * This is not a good idea when your image is raw (CVE-2008-2004), but |
| 542 | * we do it anyway for backward compatibility. |
| 543 | * |
| 544 | * @buf contains the image's first @buf_size bytes. |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 545 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
| 546 | * but can be smaller if the image file is smaller) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 547 | * @filename is its filename. |
| 548 | * |
| 549 | * For all block drivers, call the bdrv_probe() method to get its |
| 550 | * probing score. |
| 551 | * Return the first block driver with the highest probing score. |
| 552 | */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 553 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
| 554 | const char *filename) |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 555 | { |
| 556 | int score_max = 0, score; |
| 557 | BlockDriver *drv = NULL, *d; |
| 558 | |
| 559 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
| 560 | if (d->bdrv_probe) { |
| 561 | score = d->bdrv_probe(buf, buf_size, filename); |
| 562 | if (score > score_max) { |
| 563 | score_max = score; |
| 564 | drv = d; |
| 565 | } |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | return drv; |
| 570 | } |
| 571 | |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 572 | static int find_image_format(BlockDriverState *bs, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 573 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 574 | { |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 575 | BlockDriver *drv; |
Kevin Wolf | 7cddd37 | 2014-11-20 16:27:11 +0100 | [diff] [blame] | 576 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 577 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 578 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 579 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 580 | 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] | 581 | *pdrv = &bdrv_raw; |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 582 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 583 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 584 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 585 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 586 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 587 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 588 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 589 | *pdrv = NULL; |
| 590 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 591 | } |
| 592 | |
Markus Armbruster | c668424 | 2014-11-20 16:27:10 +0100 | [diff] [blame] | 593 | drv = bdrv_probe_all(buf, ret, filename); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 594 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 595 | error_setg(errp, "Could not determine image format: No compatible " |
| 596 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 597 | ret = -ENOENT; |
| 598 | } |
| 599 | *pdrv = drv; |
| 600 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 601 | } |
| 602 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 603 | /** |
| 604 | * Set the current 'total_sectors' value |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 605 | * Return 0 on success, -errno on error. |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 606 | */ |
| 607 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 608 | { |
| 609 | BlockDriver *drv = bs->drv; |
| 610 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 611 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 612 | if (bdrv_is_sg(bs)) |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 613 | return 0; |
| 614 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 615 | /* query actual device if possible, otherwise just trust the hint */ |
| 616 | if (drv->bdrv_getlength) { |
| 617 | int64_t length = drv->bdrv_getlength(bs); |
| 618 | if (length < 0) { |
| 619 | return length; |
| 620 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 621 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | bs->total_sectors = hint; |
| 625 | return 0; |
| 626 | } |
| 627 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 628 | /** |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 629 | * Combines a QDict of new block driver @options with any missing options taken |
| 630 | * from @old_options, so that leaving out an option defaults to its old value. |
| 631 | */ |
| 632 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, |
| 633 | QDict *old_options) |
| 634 | { |
| 635 | if (bs->drv && bs->drv->bdrv_join_options) { |
| 636 | bs->drv->bdrv_join_options(options, old_options); |
| 637 | } else { |
| 638 | qdict_join(options, old_options, false); |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 643 | * Set open flags for a given discard mode |
| 644 | * |
| 645 | * Return 0 on success, -1 if the discard mode was invalid. |
| 646 | */ |
| 647 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 648 | { |
| 649 | *flags &= ~BDRV_O_UNMAP; |
| 650 | |
| 651 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 652 | /* do nothing */ |
| 653 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 654 | *flags |= BDRV_O_UNMAP; |
| 655 | } else { |
| 656 | return -1; |
| 657 | } |
| 658 | |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 663 | * Set open flags for a given cache mode |
| 664 | * |
| 665 | * Return 0 on success, -1 if the cache mode was invalid. |
| 666 | */ |
| 667 | int bdrv_parse_cache_flags(const char *mode, int *flags) |
| 668 | { |
| 669 | *flags &= ~BDRV_O_CACHE_MASK; |
| 670 | |
| 671 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
| 672 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 673 | } else if (!strcmp(mode, "directsync")) { |
| 674 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 675 | } else if (!strcmp(mode, "writeback")) { |
| 676 | *flags |= BDRV_O_CACHE_WB; |
| 677 | } else if (!strcmp(mode, "unsafe")) { |
| 678 | *flags |= BDRV_O_CACHE_WB; |
| 679 | *flags |= BDRV_O_NO_FLUSH; |
| 680 | } else if (!strcmp(mode, "writethrough")) { |
| 681 | /* this is the default */ |
| 682 | } else { |
| 683 | return -1; |
| 684 | } |
| 685 | |
| 686 | return 0; |
| 687 | } |
| 688 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 689 | /* |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 690 | * Returns the flags that a temporary snapshot should get, based on the |
| 691 | * originally requested flags (the originally requested image will have flags |
| 692 | * like a backing file) |
| 693 | */ |
| 694 | static int bdrv_temp_snapshot_flags(int flags) |
| 695 | { |
| 696 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 697 | } |
| 698 | |
| 699 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 700 | * Returns the options and flags that bs->file should get if a protocol driver |
| 701 | * is expected, based on the given options and flags for the parent BDS |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 702 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 703 | static void bdrv_inherited_options(int *child_flags, QDict *child_options, |
| 704 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 705 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 706 | int flags = parent_flags; |
| 707 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 708 | /* Enable protocol handling, disable format probing for bs->file */ |
| 709 | flags |= BDRV_O_PROTOCOL; |
| 710 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 711 | /* If the cache mode isn't explicitly set, inherit direct and no-flush from |
| 712 | * the parent. */ |
| 713 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 714 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
| 715 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 716 | /* Our block drivers take care to send flushes and respect unmap policy, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 717 | * so we can default to enable both on lower layers regardless of the |
| 718 | * corresponding parent options. */ |
| 719 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_WB, "on"); |
| 720 | flags |= BDRV_O_UNMAP; |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 721 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 722 | /* Clear flags that only apply to the top layer */ |
Kevin Wolf | 5669b44 | 2014-04-11 21:36:45 +0200 | [diff] [blame] | 723 | 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] | 724 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 725 | *child_flags = flags; |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 726 | } |
| 727 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 728 | const BdrvChildRole child_file = { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 729 | .inherit_options = bdrv_inherited_options, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 730 | }; |
| 731 | |
| 732 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 733 | * Returns the options and flags that bs->file should get if the use of formats |
| 734 | * (and not only protocols) is permitted for it, based on the given options and |
| 735 | * flags for the parent BDS |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 736 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 737 | static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options, |
| 738 | int parent_flags, QDict *parent_options) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 739 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 740 | child_file.inherit_options(child_flags, child_options, |
| 741 | parent_flags, parent_options); |
| 742 | |
| 743 | *child_flags &= ~BDRV_O_PROTOCOL; |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | const BdrvChildRole child_format = { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 747 | .inherit_options = bdrv_inherited_fmt_options, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 748 | }; |
| 749 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 750 | /* |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 751 | * Returns the options and flags that bs->backing should get, based on the |
| 752 | * given options and flags for the parent BDS |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 753 | */ |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 754 | static void bdrv_backing_options(int *child_flags, QDict *child_options, |
| 755 | int parent_flags, QDict *parent_options) |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 756 | { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 757 | int flags = parent_flags; |
| 758 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 759 | /* The cache mode is inherited unmodified for backing files */ |
| 760 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_WB); |
| 761 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
| 762 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); |
| 763 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 764 | /* backing files always opened read-only */ |
| 765 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); |
| 766 | |
| 767 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 768 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 769 | |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 770 | *child_flags = flags; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 771 | } |
| 772 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 773 | static const BdrvChildRole child_backing = { |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 774 | .inherit_options = bdrv_backing_options, |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 775 | }; |
| 776 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 777 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 778 | { |
| 779 | int open_flags = flags | BDRV_O_CACHE_WB; |
| 780 | |
| 781 | /* |
| 782 | * Clear flags that are internal to the block layer before opening the |
| 783 | * image. |
| 784 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 785 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 786 | |
| 787 | /* |
| 788 | * Snapshots should be writable. |
| 789 | */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 790 | if (flags & BDRV_O_TEMPORARY) { |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 791 | open_flags |= BDRV_O_RDWR; |
| 792 | } |
| 793 | |
| 794 | return open_flags; |
| 795 | } |
| 796 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 797 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
| 798 | { |
| 799 | *flags &= ~BDRV_O_CACHE_MASK; |
| 800 | |
| 801 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_WB)); |
| 802 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, false)) { |
| 803 | *flags |= BDRV_O_CACHE_WB; |
| 804 | } |
| 805 | |
| 806 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_NO_FLUSH)); |
| 807 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { |
| 808 | *flags |= BDRV_O_NO_FLUSH; |
| 809 | } |
| 810 | |
| 811 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_DIRECT)); |
| 812 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { |
| 813 | *flags |= BDRV_O_NOCACHE; |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | static void update_options_from_flags(QDict *options, int flags) |
| 818 | { |
| 819 | if (!qdict_haskey(options, BDRV_OPT_CACHE_WB)) { |
| 820 | qdict_put(options, BDRV_OPT_CACHE_WB, |
| 821 | qbool_from_bool(flags & BDRV_O_CACHE_WB)); |
| 822 | } |
| 823 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
| 824 | qdict_put(options, BDRV_OPT_CACHE_DIRECT, |
| 825 | qbool_from_bool(flags & BDRV_O_NOCACHE)); |
| 826 | } |
| 827 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { |
| 828 | qdict_put(options, BDRV_OPT_CACHE_NO_FLUSH, |
| 829 | qbool_from_bool(flags & BDRV_O_NO_FLUSH)); |
| 830 | } |
| 831 | } |
| 832 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 833 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 834 | const char *node_name, |
| 835 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 836 | { |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 837 | char *gen_node_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 838 | |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 839 | if (!node_name) { |
| 840 | node_name = gen_node_name = id_generate(ID_BLOCK); |
| 841 | } else if (!id_wellformed(node_name)) { |
| 842 | /* |
| 843 | * Check for empty string or invalid characters, but not if it is |
| 844 | * generated (generated names use characters not available to the user) |
| 845 | */ |
Kevin Wolf | 9aebf3b | 2014-09-25 09:54:02 +0200 | [diff] [blame] | 846 | error_setg(errp, "Invalid node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 847 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 848 | } |
| 849 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 850 | /* takes care of avoiding namespaces collisions */ |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 851 | if (blk_by_name(node_name)) { |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 852 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 853 | node_name); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 854 | goto out; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 855 | } |
| 856 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 857 | /* takes care of avoiding duplicates node names */ |
| 858 | if (bdrv_find_node(node_name)) { |
| 859 | error_setg(errp, "Duplicate node name"); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 860 | goto out; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | /* copy node name into the bs and insert it into the graph list */ |
| 864 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 865 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Jeff Cody | 15489c7 | 2015-10-12 19:36:50 -0400 | [diff] [blame] | 866 | out: |
| 867 | g_free(gen_node_name); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 868 | } |
| 869 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 870 | static QemuOptsList bdrv_runtime_opts = { |
| 871 | .name = "bdrv_common", |
| 872 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), |
| 873 | .desc = { |
| 874 | { |
| 875 | .name = "node-name", |
| 876 | .type = QEMU_OPT_STRING, |
| 877 | .help = "Node name of the block device node", |
| 878 | }, |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 879 | { |
| 880 | .name = "driver", |
| 881 | .type = QEMU_OPT_STRING, |
| 882 | .help = "Block driver to use for the node", |
| 883 | }, |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 884 | { |
| 885 | .name = BDRV_OPT_CACHE_WB, |
| 886 | .type = QEMU_OPT_BOOL, |
| 887 | .help = "Enable writeback mode", |
| 888 | }, |
| 889 | { |
| 890 | .name = BDRV_OPT_CACHE_DIRECT, |
| 891 | .type = QEMU_OPT_BOOL, |
| 892 | .help = "Bypass software writeback cache on the host", |
| 893 | }, |
| 894 | { |
| 895 | .name = BDRV_OPT_CACHE_NO_FLUSH, |
| 896 | .type = QEMU_OPT_BOOL, |
| 897 | .help = "Ignore flush requests", |
| 898 | }, |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 899 | { /* end of list */ } |
| 900 | }, |
| 901 | }; |
| 902 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 903 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 904 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 905 | * |
| 906 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 907 | */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 908 | static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file, |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 909 | QDict *options, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 910 | { |
| 911 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 912 | const char *filename; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 913 | const char *driver_name = NULL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 914 | const char *node_name = NULL; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 915 | QemuOpts *opts; |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 916 | BlockDriver *drv; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 917 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 918 | |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 919 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 920 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 921 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 922 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 923 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 924 | if (local_err) { |
| 925 | error_propagate(errp, local_err); |
| 926 | ret = -EINVAL; |
| 927 | goto fail_opts; |
| 928 | } |
| 929 | |
| 930 | driver_name = qemu_opt_get(opts, "driver"); |
| 931 | drv = bdrv_find_format(driver_name); |
| 932 | assert(drv != NULL); |
| 933 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 934 | if (file != NULL) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 935 | filename = file->bs->filename; |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 936 | } else { |
| 937 | filename = qdict_get_try_str(options, "filename"); |
| 938 | } |
| 939 | |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 940 | if (drv->bdrv_needs_filename && !filename) { |
| 941 | error_setg(errp, "The '%s' block driver requires a file name", |
| 942 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 943 | ret = -EINVAL; |
| 944 | goto fail_opts; |
| 945 | } |
| 946 | |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 947 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
| 948 | drv->format_name); |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 949 | |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 950 | node_name = qemu_opt_get(opts, "node-name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 951 | bdrv_assign_node_name(bs, node_name, &local_err); |
Markus Armbruster | 0fb6395 | 2014-04-25 16:50:31 +0200 | [diff] [blame] | 952 | if (local_err) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 953 | error_propagate(errp, local_err); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 954 | ret = -EINVAL; |
| 955 | goto fail_opts; |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 956 | } |
| 957 | |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 958 | bs->request_alignment = 512; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 959 | bs->zero_beyond_eof = true; |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 960 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 961 | |
| 962 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8f94a6e | 2013-10-10 11:45:55 +0200 | [diff] [blame] | 963 | error_setg(errp, |
| 964 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 965 | ? "Driver '%s' can only be used for read-only devices" |
| 966 | : "Driver '%s' is not whitelisted", |
| 967 | drv->format_name); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 968 | ret = -ENOTSUP; |
| 969 | goto fail_opts; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 970 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 971 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 972 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 973 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 974 | if (!bs->read_only) { |
| 975 | bdrv_enable_copy_on_read(bs); |
| 976 | } else { |
| 977 | 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] | 978 | ret = -EINVAL; |
| 979 | goto fail_opts; |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 980 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 981 | } |
| 982 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 983 | if (filename != NULL) { |
| 984 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 985 | } else { |
| 986 | bs->filename[0] = '\0'; |
| 987 | } |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 988 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 989 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 990 | bs->drv = drv; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 991 | bs->opaque = g_malloc0(drv->instance_size); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 992 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 993 | /* Apply cache mode options */ |
| 994 | update_flags_from_options(&bs->open_flags, opts); |
| 995 | bdrv_set_enable_write_cache(bs, bs->open_flags & BDRV_O_CACHE_WB); |
Stefan Hajnoczi | e7c6379 | 2011-10-27 10:54:27 +0100 | [diff] [blame] | 996 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 997 | /* Open the image, either directly or using a protocol */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 998 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 999 | if (drv->bdrv_file_open) { |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 1000 | assert(file == NULL); |
Benoît Canet | 030be32 | 2013-09-24 17:07:04 +0200 | [diff] [blame] | 1001 | assert(!drv->bdrv_needs_filename || filename != NULL); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1002 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1003 | } else { |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 1004 | if (file == NULL) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1005 | error_setg(errp, "Can't use '%s' as a block driver for the " |
| 1006 | "protocol level", drv->format_name); |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 1007 | ret = -EINVAL; |
| 1008 | goto free_and_fail; |
| 1009 | } |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1010 | bs->file = file; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1011 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1012 | } |
| 1013 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1014 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1015 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1016 | error_propagate(errp, local_err); |
Dunrong Huang | 2fa9aa5 | 2013-09-24 18:14:01 +0800 | [diff] [blame] | 1017 | } else if (bs->filename[0]) { |
| 1018 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1019 | } else { |
| 1020 | error_setg_errno(errp, -ret, "Could not open image"); |
| 1021 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1022 | goto free_and_fail; |
| 1023 | } |
| 1024 | |
Markus Armbruster | a1f688f | 2015-03-13 21:09:40 +0100 | [diff] [blame] | 1025 | if (bs->encrypted) { |
| 1026 | error_report("Encrypted images are deprecated"); |
| 1027 | error_printf("Support for them will be removed in a future release.\n" |
| 1028 | "You can use 'qemu-img convert' to convert your image" |
| 1029 | " to an unencrypted one.\n"); |
| 1030 | } |
| 1031 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1032 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 1033 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1034 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1035 | goto free_and_fail; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1036 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 1037 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1038 | bdrv_refresh_limits(bs, &local_err); |
| 1039 | if (local_err) { |
| 1040 | error_propagate(errp, local_err); |
| 1041 | ret = -EINVAL; |
| 1042 | goto free_and_fail; |
| 1043 | } |
| 1044 | |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 1045 | assert(bdrv_opt_mem_align(bs) != 0); |
Denis V. Lunev | 4196d2f | 2015-05-12 17:30:55 +0300 | [diff] [blame] | 1046 | assert(bdrv_min_mem_align(bs) != 0); |
Dimitris Aragiorgis | b192af8 | 2015-06-23 13:44:56 +0300 | [diff] [blame] | 1047 | assert((bs->request_alignment != 0) || bdrv_is_sg(bs)); |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1048 | |
| 1049 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1050 | return 0; |
| 1051 | |
| 1052 | free_and_fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1053 | bs->file = NULL; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1054 | g_free(bs->opaque); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1055 | bs->opaque = NULL; |
| 1056 | bs->drv = NULL; |
Kevin Wolf | 18edf28 | 2015-04-07 17:12:56 +0200 | [diff] [blame] | 1057 | fail_opts: |
| 1058 | qemu_opts_del(opts); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1059 | return ret; |
| 1060 | } |
| 1061 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1062 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1063 | { |
| 1064 | QObject *options_obj; |
| 1065 | QDict *options; |
| 1066 | int ret; |
| 1067 | |
| 1068 | ret = strstart(filename, "json:", &filename); |
| 1069 | assert(ret); |
| 1070 | |
| 1071 | options_obj = qobject_from_json(filename); |
| 1072 | if (!options_obj) { |
| 1073 | error_setg(errp, "Could not parse the JSON options"); |
| 1074 | return NULL; |
| 1075 | } |
| 1076 | |
| 1077 | if (qobject_type(options_obj) != QTYPE_QDICT) { |
| 1078 | qobject_decref(options_obj); |
| 1079 | error_setg(errp, "Invalid JSON object given"); |
| 1080 | return NULL; |
| 1081 | } |
| 1082 | |
| 1083 | options = qobject_to_qdict(options_obj); |
| 1084 | qdict_flatten(options); |
| 1085 | |
| 1086 | return options; |
| 1087 | } |
| 1088 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1089 | static void parse_json_protocol(QDict *options, const char **pfilename, |
| 1090 | Error **errp) |
| 1091 | { |
| 1092 | QDict *json_options; |
| 1093 | Error *local_err = NULL; |
| 1094 | |
| 1095 | /* Parse json: pseudo-protocol */ |
| 1096 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { |
| 1097 | return; |
| 1098 | } |
| 1099 | |
| 1100 | json_options = parse_json_filename(*pfilename, &local_err); |
| 1101 | if (local_err) { |
| 1102 | error_propagate(errp, local_err); |
| 1103 | return; |
| 1104 | } |
| 1105 | |
| 1106 | /* Options given in the filename have lower priority than options |
| 1107 | * specified directly */ |
| 1108 | qdict_join(options, json_options, false); |
| 1109 | QDECREF(json_options); |
| 1110 | *pfilename = NULL; |
| 1111 | } |
| 1112 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1113 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1114 | * Fills in default options for opening images and converts the legacy |
| 1115 | * filename/flags pair to option QDict entries. |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1116 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
| 1117 | * block driver has been specified explicitly. |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1118 | */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1119 | static int bdrv_fill_options(QDict **options, const char *filename, |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1120 | int *flags, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1121 | { |
| 1122 | const char *drvname; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1123 | bool protocol = *flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1124 | bool parse_filename = false; |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1125 | BlockDriver *drv = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1126 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1127 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1128 | drvname = qdict_get_try_str(*options, "driver"); |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1129 | if (drvname) { |
| 1130 | drv = bdrv_find_format(drvname); |
| 1131 | if (!drv) { |
| 1132 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1133 | return -ENOENT; |
| 1134 | } |
| 1135 | /* If the user has explicitly specified the driver, this choice should |
| 1136 | * override the BDRV_O_PROTOCOL flag */ |
| 1137 | protocol = drv->bdrv_file_open; |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1138 | } |
| 1139 | |
| 1140 | if (protocol) { |
| 1141 | *flags |= BDRV_O_PROTOCOL; |
| 1142 | } else { |
| 1143 | *flags &= ~BDRV_O_PROTOCOL; |
| 1144 | } |
| 1145 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1146 | /* Translate cache options from flags into options */ |
| 1147 | update_options_from_flags(*options, *flags); |
| 1148 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1149 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1150 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1151 | if (!qdict_haskey(*options, "filename")) { |
| 1152 | qdict_put(*options, "filename", qstring_from_str(filename)); |
| 1153 | parse_filename = true; |
| 1154 | } else { |
| 1155 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1156 | "the same time"); |
| 1157 | return -EINVAL; |
| 1158 | } |
| 1159 | } |
| 1160 | |
| 1161 | /* Find the right block driver */ |
| 1162 | filename = qdict_get_try_str(*options, "filename"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1163 | |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1164 | if (!drvname && protocol) { |
| 1165 | if (filename) { |
| 1166 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
| 1167 | if (!drv) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1168 | return -EINVAL; |
| 1169 | } |
Max Reitz | 053e157 | 2015-08-26 19:47:51 +0200 | [diff] [blame] | 1170 | |
| 1171 | drvname = drv->format_name; |
| 1172 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1173 | } else { |
| 1174 | error_setg(errp, "Must specify either driver or file"); |
| 1175 | return -EINVAL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1176 | } |
| 1177 | } |
| 1178 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1179 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1180 | |
| 1181 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1182 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1183 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1184 | if (local_err) { |
| 1185 | error_propagate(errp, local_err); |
| 1186 | return -EINVAL; |
| 1187 | } |
| 1188 | |
| 1189 | if (!drv->bdrv_needs_filename) { |
| 1190 | qdict_del(*options, "filename"); |
| 1191 | } |
| 1192 | } |
| 1193 | |
Max Reitz | d44f928 | 2015-10-19 17:53:08 +0200 | [diff] [blame] | 1194 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 1195 | *flags |= BDRV_O_INACTIVE; |
Max Reitz | d44f928 | 2015-10-19 17:53:08 +0200 | [diff] [blame] | 1196 | } |
| 1197 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1198 | return 0; |
| 1199 | } |
| 1200 | |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1201 | static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
| 1202 | BlockDriverState *child_bs, |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 1203 | const char *child_name, |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1204 | const BdrvChildRole *child_role) |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1205 | { |
| 1206 | BdrvChild *child = g_new(BdrvChild, 1); |
| 1207 | *child = (BdrvChild) { |
| 1208 | .bs = child_bs, |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 1209 | .name = g_strdup(child_name), |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1210 | .role = child_role, |
| 1211 | }; |
| 1212 | |
| 1213 | QLIST_INSERT_HEAD(&parent_bs->children, child, next); |
Kevin Wolf | d42a8a9 | 2015-09-17 13:18:23 +0200 | [diff] [blame] | 1214 | QLIST_INSERT_HEAD(&child_bs->parents, child, next_parent); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1215 | |
| 1216 | return child; |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1217 | } |
| 1218 | |
Kevin Wolf | 3f09bfb | 2015-09-15 11:58:23 +0200 | [diff] [blame] | 1219 | static void bdrv_detach_child(BdrvChild *child) |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1220 | { |
| 1221 | QLIST_REMOVE(child, next); |
Kevin Wolf | d42a8a9 | 2015-09-17 13:18:23 +0200 | [diff] [blame] | 1222 | QLIST_REMOVE(child, next_parent); |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 1223 | g_free(child->name); |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1224 | g_free(child); |
| 1225 | } |
| 1226 | |
| 1227 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) |
| 1228 | { |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 1229 | BlockDriverState *child_bs; |
| 1230 | |
| 1231 | if (child == NULL) { |
| 1232 | return; |
| 1233 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1234 | |
| 1235 | if (child->bs->inherits_from == parent) { |
| 1236 | child->bs->inherits_from = NULL; |
| 1237 | } |
| 1238 | |
Kevin Wolf | 779020c | 2015-10-13 14:09:44 +0200 | [diff] [blame] | 1239 | child_bs = child->bs; |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 1240 | bdrv_detach_child(child); |
| 1241 | bdrv_unref(child_bs); |
| 1242 | } |
| 1243 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 1244 | /* |
| 1245 | * Sets the backing file link of a BDS. A new reference is created; callers |
| 1246 | * which don't need their own reference any more must call bdrv_unref(). |
| 1247 | */ |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1248 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
| 1249 | { |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 1250 | if (backing_hd) { |
| 1251 | bdrv_ref(backing_hd); |
| 1252 | } |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1253 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1254 | if (bs->backing) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1255 | assert(bs->backing_blocker); |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1256 | bdrv_op_unblock_all(bs->backing->bs, bs->backing_blocker); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 1257 | bdrv_unref_child(bs, bs->backing); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1258 | } else if (backing_hd) { |
| 1259 | error_setg(&bs->backing_blocker, |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 1260 | "node is used as backing hd of '%s'", |
| 1261 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1262 | } |
| 1263 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1264 | if (!backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1265 | error_free(bs->backing_blocker); |
| 1266 | bs->backing_blocker = NULL; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1267 | bs->backing = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1268 | goto out; |
| 1269 | } |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 1270 | bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1271 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
| 1272 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); |
| 1273 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), |
| 1274 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1275 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1276 | bdrv_op_block_all(backing_hd, bs->backing_blocker); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1277 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1278 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1279 | bs->backing_blocker); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1280 | out: |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 1281 | bdrv_refresh_limits(bs, NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1282 | } |
| 1283 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1284 | /* |
| 1285 | * Opens the backing file for a BlockDriverState if not yet open |
| 1286 | * |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1287 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
| 1288 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 1289 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 1290 | * BlockdevRef. |
| 1291 | * |
| 1292 | * TODO Can this be unified with bdrv_open_image()? |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1293 | */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1294 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
| 1295 | const char *bdref_key, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1296 | { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1297 | char *backing_filename = g_malloc0(PATH_MAX); |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1298 | char *bdref_key_dot; |
| 1299 | const char *reference = NULL; |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1300 | int ret = 0; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1301 | BlockDriverState *backing_hd; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1302 | QDict *options; |
| 1303 | QDict *tmp_parent_options = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1304 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1305 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 1306 | if (bs->backing != NULL) { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1307 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1308 | } |
| 1309 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1310 | /* NULL means an empty set of options */ |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1311 | if (parent_options == NULL) { |
| 1312 | tmp_parent_options = qdict_new(); |
| 1313 | parent_options = tmp_parent_options; |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1314 | } |
| 1315 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1316 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1317 | |
| 1318 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 1319 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); |
| 1320 | g_free(bdref_key_dot); |
| 1321 | |
| 1322 | reference = qdict_get_try_str(parent_options, bdref_key); |
| 1323 | if (reference || qdict_haskey(options, "file.filename")) { |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 1324 | backing_filename[0] = '\0'; |
| 1325 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1326 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1327 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 1328 | } else { |
Max Reitz | 9f07429 | 2014-11-26 17:20:26 +0100 | [diff] [blame] | 1329 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
| 1330 | &local_err); |
| 1331 | if (local_err) { |
| 1332 | ret = -EINVAL; |
| 1333 | error_propagate(errp, local_err); |
| 1334 | QDECREF(options); |
| 1335 | goto free_exit; |
| 1336 | } |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1337 | } |
| 1338 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 1339 | if (!bs->drv || !bs->drv->supports_backing) { |
| 1340 | ret = -EINVAL; |
| 1341 | error_setg(errp, "Driver doesn't support backing files"); |
| 1342 | QDECREF(options); |
| 1343 | goto free_exit; |
| 1344 | } |
| 1345 | |
Kevin Wolf | c5f6e49 | 2014-11-25 18:12:42 +0100 | [diff] [blame] | 1346 | if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
| 1347 | qdict_put(options, "driver", qstring_from_str(bs->backing_format)); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1348 | } |
| 1349 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1350 | backing_hd = NULL; |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1351 | ret = bdrv_open_inherit(&backing_hd, |
| 1352 | *backing_filename ? backing_filename : NULL, |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1353 | reference, options, 0, bs, &child_backing, |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 1354 | errp); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1355 | if (ret < 0) { |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1356 | bs->open_flags |= BDRV_O_NO_BACKING; |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 1357 | error_prepend(errp, "Could not open backing file: "); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1358 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1359 | } |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1360 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 1361 | /* Hook up the backing file link; drop our reference, bs owns the |
| 1362 | * backing_hd reference now */ |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1363 | bdrv_set_backing_hd(bs, backing_hd); |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 1364 | bdrv_unref(backing_hd); |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 1365 | |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1366 | qdict_del(parent_options, bdref_key); |
| 1367 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1368 | free_exit: |
| 1369 | g_free(backing_filename); |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1370 | QDECREF(tmp_parent_options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1371 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1372 | } |
| 1373 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1374 | /* |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1375 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 1376 | * device's options. |
| 1377 | * |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1378 | * 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] | 1379 | * BlockdevRef is given. NULL will be returned, but errp remains unset. |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1380 | * |
| 1381 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 1382 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 1383 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 1384 | * BlockdevRef. |
| 1385 | * |
| 1386 | * The BlockdevRef will be removed from the options QDict. |
| 1387 | */ |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1388 | BdrvChild *bdrv_open_child(const char *filename, |
| 1389 | QDict *options, const char *bdref_key, |
| 1390 | BlockDriverState* parent, |
| 1391 | const BdrvChildRole *child_role, |
| 1392 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1393 | { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1394 | BdrvChild *c = NULL; |
| 1395 | BlockDriverState *bs; |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1396 | QDict *image_options; |
| 1397 | int ret; |
| 1398 | char *bdref_key_dot; |
| 1399 | const char *reference; |
| 1400 | |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1401 | assert(child_role != NULL); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1402 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1403 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 1404 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 1405 | g_free(bdref_key_dot); |
| 1406 | |
| 1407 | reference = qdict_get_try_str(options, bdref_key); |
| 1408 | if (!filename && !reference && !qdict_size(image_options)) { |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1409 | if (!allow_none) { |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1410 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 1411 | bdref_key); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1412 | } |
Markus Armbruster | b20e61e | 2014-05-28 11:16:57 +0200 | [diff] [blame] | 1413 | QDECREF(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1414 | goto done; |
| 1415 | } |
| 1416 | |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1417 | bs = NULL; |
| 1418 | ret = bdrv_open_inherit(&bs, filename, reference, image_options, 0, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 1419 | parent, child_role, errp); |
Kevin Wolf | df58179 | 2015-06-15 11:53:47 +0200 | [diff] [blame] | 1420 | if (ret < 0) { |
| 1421 | goto done; |
| 1422 | } |
| 1423 | |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 1424 | c = bdrv_attach_child(parent, bs, bdref_key, child_role); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1425 | |
| 1426 | done: |
| 1427 | qdict_del(options, bdref_key); |
Kevin Wolf | b4b059f | 2015-06-15 13:24:19 +0200 | [diff] [blame] | 1428 | return c; |
| 1429 | } |
| 1430 | |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1431 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1432 | { |
| 1433 | /* 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] | 1434 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1435 | int64_t total_size; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1436 | QemuOpts *opts = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1437 | QDict *snapshot_options; |
| 1438 | BlockDriverState *bs_snapshot; |
Fam Zheng | c2e0dbb | 2015-07-06 12:24:44 +0800 | [diff] [blame] | 1439 | Error *local_err = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1440 | int ret; |
| 1441 | |
| 1442 | /* if snapshot, we create a temporary backing file and open it |
| 1443 | instead of opening 'filename' directly */ |
| 1444 | |
| 1445 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1446 | total_size = bdrv_getlength(bs); |
| 1447 | if (total_size < 0) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1448 | ret = total_size; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1449 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1450 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1451 | } |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1452 | |
| 1453 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1454 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1455 | if (ret < 0) { |
| 1456 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1457 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1458 | } |
| 1459 | |
Max Reitz | ef81043 | 2014-12-02 18:32:42 +0100 | [diff] [blame] | 1460 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1461 | &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 1462 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 1463 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1464 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1465 | if (ret < 0) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 1466 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
| 1467 | tmp_filename); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1468 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1469 | } |
| 1470 | |
| 1471 | /* Prepare a new options QDict for the temporary file */ |
| 1472 | snapshot_options = qdict_new(); |
| 1473 | qdict_put(snapshot_options, "file.driver", |
| 1474 | qstring_from_str("file")); |
| 1475 | qdict_put(snapshot_options, "file.filename", |
| 1476 | qstring_from_str(tmp_filename)); |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 1477 | qdict_put(snapshot_options, "driver", |
| 1478 | qstring_from_str("qcow2")); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1479 | |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1480 | bs_snapshot = bdrv_new(); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1481 | |
| 1482 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, |
Max Reitz | 6ebf9aa | 2015-08-26 19:47:49 +0200 | [diff] [blame] | 1483 | flags, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1484 | if (ret < 0) { |
| 1485 | error_propagate(errp, local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1486 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1487 | } |
| 1488 | |
| 1489 | bdrv_append(bs_snapshot, bs); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1490 | |
| 1491 | out: |
| 1492 | g_free(tmp_filename); |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1493 | return ret; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1494 | } |
| 1495 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1496 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1497 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1498 | * |
| 1499 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1500 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1501 | * after the call (even on failure), so if the caller intends to reuse the |
| 1502 | * dictionary, it needs to use QINCREF() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1503 | * |
| 1504 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 1505 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1506 | * |
| 1507 | * The reference parameter may be used to specify an existing block device which |
| 1508 | * should be opened. If specified, neither options nor a filename may be given, |
| 1509 | * 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] | 1510 | */ |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1511 | static int bdrv_open_inherit(BlockDriverState **pbs, const char *filename, |
| 1512 | const char *reference, QDict *options, int flags, |
| 1513 | BlockDriverState *parent, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 1514 | const BdrvChildRole *child_role, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1515 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1516 | int ret; |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1517 | BdrvChild *file = NULL; |
| 1518 | BlockDriverState *bs; |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 1519 | BlockDriver *drv = NULL; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 1520 | const char *drvname; |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 1521 | const char *backing; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1522 | Error *local_err = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1523 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 1524 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1525 | assert(pbs); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1526 | assert(!child_role || !flags); |
| 1527 | assert(!child_role == !parent); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1528 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1529 | if (reference) { |
| 1530 | bool options_non_empty = options ? qdict_size(options) : false; |
| 1531 | QDECREF(options); |
| 1532 | |
| 1533 | if (*pbs) { |
| 1534 | error_setg(errp, "Cannot reuse an existing BDS when referencing " |
| 1535 | "another block device"); |
| 1536 | return -EINVAL; |
| 1537 | } |
| 1538 | |
| 1539 | if (filename || options_non_empty) { |
| 1540 | error_setg(errp, "Cannot reference an existing block device with " |
| 1541 | "additional options or a new filename"); |
| 1542 | return -EINVAL; |
| 1543 | } |
| 1544 | |
| 1545 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 1546 | if (!bs) { |
| 1547 | return -ENODEV; |
| 1548 | } |
| 1549 | bdrv_ref(bs); |
| 1550 | *pbs = bs; |
| 1551 | return 0; |
| 1552 | } |
| 1553 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1554 | if (*pbs) { |
| 1555 | bs = *pbs; |
| 1556 | } else { |
Markus Armbruster | e4e9986 | 2014-10-07 13:59:03 +0200 | [diff] [blame] | 1557 | bs = bdrv_new(); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1558 | } |
| 1559 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1560 | /* NULL means an empty set of options */ |
| 1561 | if (options == NULL) { |
| 1562 | options = qdict_new(); |
| 1563 | } |
| 1564 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1565 | /* json: syntax counts as explicit options, as if in the QDict */ |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1566 | parse_json_protocol(options, &filename, &local_err); |
| 1567 | if (local_err) { |
| 1568 | ret = -EINVAL; |
| 1569 | goto fail; |
| 1570 | } |
| 1571 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1572 | bs->explicit_options = qdict_clone_shallow(options); |
| 1573 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1574 | if (child_role) { |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 1575 | bs->inherits_from = parent; |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1576 | child_role->inherit_options(&flags, options, |
| 1577 | parent->open_flags, parent->options); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1578 | } |
| 1579 | |
Kevin Wolf | de3b53f | 2015-10-29 15:24:41 +0100 | [diff] [blame] | 1580 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1581 | if (local_err) { |
| 1582 | goto fail; |
| 1583 | } |
| 1584 | |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1585 | bs->open_flags = flags; |
| 1586 | bs->options = options; |
| 1587 | options = qdict_clone_shallow(options); |
| 1588 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1589 | /* Find the right image format driver */ |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1590 | drvname = qdict_get_try_str(options, "driver"); |
| 1591 | if (drvname) { |
| 1592 | drv = bdrv_find_format(drvname); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1593 | if (!drv) { |
| 1594 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 1595 | ret = -EINVAL; |
| 1596 | goto fail; |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1601 | |
Alberto Garcia | 3e8c2e5 | 2015-10-26 14:27:15 +0200 | [diff] [blame] | 1602 | backing = qdict_get_try_str(options, "backing"); |
| 1603 | if (backing && *backing == '\0') { |
| 1604 | flags |= BDRV_O_NO_BACKING; |
| 1605 | qdict_del(options, "backing"); |
| 1606 | } |
| 1607 | |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1608 | /* Open image file without format layer */ |
| 1609 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
| 1610 | if (flags & BDRV_O_RDWR) { |
| 1611 | flags |= BDRV_O_ALLOW_RDWR; |
| 1612 | } |
| 1613 | if (flags & BDRV_O_SNAPSHOT) { |
| 1614 | snapshot_flags = bdrv_temp_snapshot_flags(flags); |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1615 | bdrv_backing_options(&flags, options, flags, options); |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1616 | } |
| 1617 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1618 | bs->open_flags = flags; |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 1619 | |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1620 | file = bdrv_open_child(filename, options, "file", bs, |
| 1621 | &child_file, true, &local_err); |
Kevin Wolf | 1fdd693 | 2015-06-15 14:11:51 +0200 | [diff] [blame] | 1622 | if (local_err) { |
| 1623 | ret = -EINVAL; |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 1624 | goto fail; |
| 1625 | } |
| 1626 | } |
| 1627 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1628 | /* Image format probing */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 1629 | bs->probed = !drv; |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1630 | if (!drv && file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1631 | ret = find_image_format(file->bs, filename, &drv, &local_err); |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1632 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1633 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1634 | } |
Kevin Wolf | 62392eb | 2015-04-24 16:38:02 +0200 | [diff] [blame] | 1635 | /* |
| 1636 | * This option update would logically belong in bdrv_fill_options(), |
| 1637 | * but we first need to open bs->file for the probing to work, while |
| 1638 | * opening bs->file already requires the (mostly) final set of options |
| 1639 | * so that cache mode etc. can be inherited. |
| 1640 | * |
| 1641 | * Adding the driver later is somewhat ugly, but it's not an option |
| 1642 | * that would ever be inherited, so it's correct. We just need to make |
| 1643 | * sure to update both bs->options (which has the full effective |
| 1644 | * options for bs) and options (which has file.* already removed). |
| 1645 | */ |
| 1646 | qdict_put(bs->options, "driver", qstring_from_str(drv->format_name)); |
| 1647 | qdict_put(options, "driver", qstring_from_str(drv->format_name)); |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1648 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1649 | error_setg(errp, "Must specify either driver or file"); |
| 1650 | ret = -EINVAL; |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1651 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1652 | } |
| 1653 | |
Max Reitz | 53a2951 | 2015-03-19 14:53:16 -0400 | [diff] [blame] | 1654 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
| 1655 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); |
| 1656 | /* file must be NULL if a protocol BDS is about to be created |
| 1657 | * (the inverse results in an error message from bdrv_open_common()) */ |
| 1658 | assert(!(flags & BDRV_O_PROTOCOL) || !file); |
| 1659 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1660 | /* Open the image */ |
Kevin Wolf | 82dc8b4 | 2016-01-11 19:07:50 +0100 | [diff] [blame] | 1661 | ret = bdrv_open_common(bs, file, options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1662 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1663 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 1664 | } |
| 1665 | |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1666 | if (file && (bs->file != file)) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1667 | bdrv_unref_child(bs, file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1668 | file = NULL; |
| 1669 | } |
| 1670 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1671 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1672 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | d9b7b05 | 2015-01-16 18:23:41 +0100 | [diff] [blame] | 1673 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1674 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1675 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1676 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1677 | } |
| 1678 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 1679 | bdrv_refresh_filename(bs); |
| 1680 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1681 | /* Check if any unknown options were used */ |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1682 | if (options && (qdict_size(options) != 0)) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1683 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1684 | if (flags & BDRV_O_PROTOCOL) { |
| 1685 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 1686 | "'%s'", drv->format_name, entry->key); |
| 1687 | } else { |
| 1688 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
| 1689 | "support the option '%s'", drv->format_name, |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 1690 | bdrv_get_device_name(bs), entry->key); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1691 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1692 | |
| 1693 | ret = -EINVAL; |
| 1694 | goto close_and_fail; |
| 1695 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1696 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1697 | if (!bdrv_key_required(bs)) { |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 1698 | if (bs->blk) { |
| 1699 | blk_dev_change_media_cb(bs->blk, true); |
| 1700 | } |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1701 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
| 1702 | && !runstate_check(RUN_STATE_INMIGRATE) |
| 1703 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ |
| 1704 | error_setg(errp, |
| 1705 | "Guest must be stopped for opening of encrypted image"); |
| 1706 | ret = -EBUSY; |
| 1707 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1708 | } |
| 1709 | |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1710 | QDECREF(options); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1711 | *pbs = bs; |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 1712 | |
| 1713 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 1714 | * temporary snapshot afterwards. */ |
| 1715 | if (snapshot_flags) { |
| 1716 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
| 1717 | if (local_err) { |
| 1718 | goto close_and_fail; |
| 1719 | } |
| 1720 | } |
| 1721 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1722 | return 0; |
| 1723 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1724 | fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1725 | if (file != NULL) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 1726 | bdrv_unref_child(bs, file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1727 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1728 | QDECREF(bs->explicit_options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1729 | QDECREF(bs->options); |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1730 | QDECREF(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1731 | bs->options = NULL; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1732 | if (!*pbs) { |
| 1733 | /* If *pbs is NULL, a new BDS has been created in this function and |
| 1734 | needs to be freed now. Otherwise, it does not need to be closed, |
| 1735 | since it has not really been opened yet. */ |
| 1736 | bdrv_unref(bs); |
| 1737 | } |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1738 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1739 | error_propagate(errp, local_err); |
| 1740 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1741 | return ret; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1742 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1743 | close_and_fail: |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1744 | /* See fail path, but now the BDS has to be always closed */ |
| 1745 | if (*pbs) { |
| 1746 | bdrv_close(bs); |
| 1747 | } else { |
| 1748 | bdrv_unref(bs); |
| 1749 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1750 | QDECREF(options); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1751 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1752 | error_propagate(errp, local_err); |
| 1753 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1754 | return ret; |
| 1755 | } |
| 1756 | |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1757 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
Max Reitz | 6ebf9aa | 2015-08-26 19:47:49 +0200 | [diff] [blame] | 1758 | const char *reference, QDict *options, int flags, Error **errp) |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1759 | { |
| 1760 | return bdrv_open_inherit(pbs, filename, reference, options, flags, NULL, |
Max Reitz | ce34377 | 2015-08-26 19:47:50 +0200 | [diff] [blame] | 1761 | NULL, errp); |
Kevin Wolf | f3930ed | 2015-04-08 13:43:47 +0200 | [diff] [blame] | 1762 | } |
| 1763 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1764 | typedef struct BlockReopenQueueEntry { |
| 1765 | bool prepared; |
| 1766 | BDRVReopenState state; |
| 1767 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1768 | } BlockReopenQueueEntry; |
| 1769 | |
| 1770 | /* |
| 1771 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 1772 | * reopen of multiple devices. |
| 1773 | * |
| 1774 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 1775 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 1776 | * be created and initialized. This newly created BlockReopenQueue should be |
| 1777 | * passed back in for subsequent calls that are intended to be of the same |
| 1778 | * atomic 'set'. |
| 1779 | * |
| 1780 | * bs is the BlockDriverState to add to the reopen queue. |
| 1781 | * |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1782 | * options contains the changed options for the associated bs |
| 1783 | * (the BlockReopenQueue takes ownership) |
| 1784 | * |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1785 | * flags contains the open flags for the associated bs |
| 1786 | * |
| 1787 | * returns a pointer to bs_queue, which is either the newly allocated |
| 1788 | * bs_queue, or the existing bs_queue being used. |
| 1789 | * |
| 1790 | */ |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1791 | static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, |
| 1792 | BlockDriverState *bs, |
| 1793 | QDict *options, |
| 1794 | int flags, |
| 1795 | const BdrvChildRole *role, |
| 1796 | QDict *parent_options, |
| 1797 | int parent_flags) |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1798 | { |
| 1799 | assert(bs != NULL); |
| 1800 | |
| 1801 | BlockReopenQueueEntry *bs_entry; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1802 | BdrvChild *child; |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1803 | QDict *old_options, *explicit_options; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1804 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1805 | if (bs_queue == NULL) { |
| 1806 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 1807 | QSIMPLEQ_INIT(bs_queue); |
| 1808 | } |
| 1809 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1810 | if (!options) { |
| 1811 | options = qdict_new(); |
| 1812 | } |
| 1813 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1814 | /* |
| 1815 | * Precedence of options: |
| 1816 | * 1. Explicitly passed in options (highest) |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1817 | * 2. Set in flags (only for top level) |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1818 | * 3. Retained from explicitly set options of bs |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1819 | * 4. Inherited from parent node |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1820 | * 5. Retained from effective options of bs |
| 1821 | */ |
| 1822 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 1823 | if (!parent_options) { |
| 1824 | /* |
| 1825 | * Any setting represented by flags is always updated. If the |
| 1826 | * corresponding QDict option is set, it takes precedence. Otherwise |
| 1827 | * the flag is translated into a QDict option. The old setting of bs is |
| 1828 | * not considered. |
| 1829 | */ |
| 1830 | update_options_from_flags(options, flags); |
| 1831 | } |
| 1832 | |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1833 | /* Old explicitly set values (don't overwrite by inherited value) */ |
| 1834 | old_options = qdict_clone_shallow(bs->explicit_options); |
| 1835 | bdrv_join_options(bs, options, old_options); |
| 1836 | QDECREF(old_options); |
| 1837 | |
| 1838 | explicit_options = qdict_clone_shallow(options); |
| 1839 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1840 | /* Inherit from parent node */ |
| 1841 | if (parent_options) { |
| 1842 | assert(!flags); |
Kevin Wolf | 8e2160e | 2015-04-29 17:29:39 +0200 | [diff] [blame] | 1843 | role->inherit_options(&flags, options, parent_flags, parent_options); |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1844 | } |
| 1845 | |
| 1846 | /* Old values are used for options that aren't set yet */ |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1847 | old_options = qdict_clone_shallow(bs->options); |
Kevin Wolf | cddff5b | 2015-11-16 16:43:27 +0100 | [diff] [blame] | 1848 | bdrv_join_options(bs, options, old_options); |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1849 | QDECREF(old_options); |
| 1850 | |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1851 | /* bdrv_open() masks this flag out */ |
| 1852 | flags &= ~BDRV_O_PROTOCOL; |
| 1853 | |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1854 | QLIST_FOREACH(child, &bs->children, next) { |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 1855 | QDict *new_child_options; |
| 1856 | char *child_key_dot; |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1857 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 1858 | /* reopen can only change the options of block devices that were |
| 1859 | * implicitly created and inherited options. For other (referenced) |
| 1860 | * block devices, a syntax like "backing.foo" results in an error. */ |
Kevin Wolf | 67251a3 | 2015-04-09 18:54:04 +0200 | [diff] [blame] | 1861 | if (child->bs->inherits_from != bs) { |
| 1862 | continue; |
| 1863 | } |
| 1864 | |
Kevin Wolf | 4c9dfe5 | 2015-05-08 15:14:15 +0200 | [diff] [blame] | 1865 | child_key_dot = g_strdup_printf("%s.", child->name); |
| 1866 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); |
| 1867 | g_free(child_key_dot); |
| 1868 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1869 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, 0, |
| 1870 | child->role, options, flags); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1871 | } |
| 1872 | |
| 1873 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 1874 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 1875 | |
| 1876 | bs_entry->state.bs = bs; |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1877 | bs_entry->state.options = options; |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1878 | bs_entry->state.explicit_options = explicit_options; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1879 | bs_entry->state.flags = flags; |
| 1880 | |
| 1881 | return bs_queue; |
| 1882 | } |
| 1883 | |
Kevin Wolf | 2851810 | 2015-05-08 17:07:31 +0200 | [diff] [blame] | 1884 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 1885 | BlockDriverState *bs, |
| 1886 | QDict *options, int flags) |
| 1887 | { |
| 1888 | return bdrv_reopen_queue_child(bs_queue, bs, options, flags, |
| 1889 | NULL, NULL, 0); |
| 1890 | } |
| 1891 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1892 | /* |
| 1893 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 1894 | * |
| 1895 | * The queue passed in (bs_queue) must have been built up previous |
| 1896 | * via bdrv_reopen_queue(). |
| 1897 | * |
| 1898 | * Reopens all BDS specified in the queue, with the appropriate |
| 1899 | * flags. All devices are prepared for reopen, and failure of any |
| 1900 | * device will cause all device changes to be abandonded, and intermediate |
| 1901 | * data cleaned up. |
| 1902 | * |
| 1903 | * If all devices prepare successfully, then the changes are committed |
| 1904 | * to all devices. |
| 1905 | * |
| 1906 | */ |
| 1907 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
| 1908 | { |
| 1909 | int ret = -1; |
| 1910 | BlockReopenQueueEntry *bs_entry, *next; |
| 1911 | Error *local_err = NULL; |
| 1912 | |
| 1913 | assert(bs_queue != NULL); |
| 1914 | |
| 1915 | bdrv_drain_all(); |
| 1916 | |
| 1917 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1918 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { |
| 1919 | error_propagate(errp, local_err); |
| 1920 | goto cleanup; |
| 1921 | } |
| 1922 | bs_entry->prepared = true; |
| 1923 | } |
| 1924 | |
| 1925 | /* If we reach this point, we have success and just need to apply the |
| 1926 | * changes |
| 1927 | */ |
| 1928 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1929 | bdrv_reopen_commit(&bs_entry->state); |
| 1930 | } |
| 1931 | |
| 1932 | ret = 0; |
| 1933 | |
| 1934 | cleanup: |
| 1935 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 1936 | if (ret && bs_entry->prepared) { |
| 1937 | bdrv_reopen_abort(&bs_entry->state); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 1938 | } else if (ret) { |
| 1939 | QDECREF(bs_entry->state.explicit_options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1940 | } |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1941 | QDECREF(bs_entry->state.options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1942 | g_free(bs_entry); |
| 1943 | } |
| 1944 | g_free(bs_queue); |
| 1945 | return ret; |
| 1946 | } |
| 1947 | |
| 1948 | |
| 1949 | /* Reopen a single BlockDriverState with the specified flags. */ |
| 1950 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) |
| 1951 | { |
| 1952 | int ret = -1; |
| 1953 | Error *local_err = NULL; |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 1954 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, NULL, bdrv_flags); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1955 | |
| 1956 | ret = bdrv_reopen_multiple(queue, &local_err); |
| 1957 | if (local_err != NULL) { |
| 1958 | error_propagate(errp, local_err); |
| 1959 | } |
| 1960 | return ret; |
| 1961 | } |
| 1962 | |
| 1963 | |
| 1964 | /* |
| 1965 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 1966 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 1967 | * the block driver layer .bdrv_reopen_prepare() |
| 1968 | * |
| 1969 | * bs is the BlockDriverState to reopen |
| 1970 | * flags are the new open flags |
| 1971 | * queue is the reopen queue |
| 1972 | * |
| 1973 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 1974 | * as well. |
| 1975 | * |
| 1976 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 1977 | * It is the responsibility of the caller to then call the abort() or |
| 1978 | * commit() for any other BDS that have been left in a prepare() state |
| 1979 | * |
| 1980 | */ |
| 1981 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 1982 | Error **errp) |
| 1983 | { |
| 1984 | int ret = -1; |
| 1985 | Error *local_err = NULL; |
| 1986 | BlockDriver *drv; |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 1987 | QemuOpts *opts; |
| 1988 | const char *value; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1989 | |
| 1990 | assert(reopen_state != NULL); |
| 1991 | assert(reopen_state->bs->drv != NULL); |
| 1992 | drv = reopen_state->bs->drv; |
| 1993 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 1994 | /* Process generic block layer options */ |
| 1995 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
| 1996 | qemu_opts_absorb_qdict(opts, reopen_state->options, &local_err); |
| 1997 | if (local_err) { |
| 1998 | error_propagate(errp, local_err); |
| 1999 | ret = -EINVAL; |
| 2000 | goto error; |
| 2001 | } |
| 2002 | |
Kevin Wolf | 91a097e | 2015-05-08 17:49:53 +0200 | [diff] [blame] | 2003 | update_flags_from_options(&reopen_state->flags, opts); |
| 2004 | |
| 2005 | /* If a guest device is attached, it owns WCE */ |
| 2006 | if (reopen_state->bs->blk && blk_get_attached_dev(reopen_state->bs->blk)) { |
| 2007 | bool old_wce = bdrv_enable_write_cache(reopen_state->bs); |
| 2008 | bool new_wce = (reopen_state->flags & BDRV_O_CACHE_WB); |
| 2009 | if (old_wce != new_wce) { |
| 2010 | error_setg(errp, "Cannot change cache.writeback: Device attached"); |
| 2011 | ret = -EINVAL; |
| 2012 | goto error; |
| 2013 | } |
| 2014 | } |
| 2015 | |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 2016 | /* node-name and driver must be unchanged. Put them back into the QDict, so |
| 2017 | * that they are checked at the end of this function. */ |
| 2018 | value = qemu_opt_get(opts, "node-name"); |
| 2019 | if (value) { |
| 2020 | qdict_put(reopen_state->options, "node-name", qstring_from_str(value)); |
| 2021 | } |
| 2022 | |
| 2023 | value = qemu_opt_get(opts, "driver"); |
| 2024 | if (value) { |
| 2025 | qdict_put(reopen_state->options, "driver", qstring_from_str(value)); |
| 2026 | } |
| 2027 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2028 | /* if we are to stay read-only, do not allow permission change |
| 2029 | * to r/w */ |
| 2030 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 2031 | reopen_state->flags & BDRV_O_RDWR) { |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2032 | error_setg(errp, "Node '%s' is read only", |
| 2033 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2034 | goto error; |
| 2035 | } |
| 2036 | |
| 2037 | |
| 2038 | ret = bdrv_flush(reopen_state->bs); |
| 2039 | if (ret) { |
Eric Blake | 455b0fd | 2015-11-10 23:51:20 -0700 | [diff] [blame] | 2040 | error_setg_errno(errp, -ret, "Error flushing drive"); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2041 | goto error; |
| 2042 | } |
| 2043 | |
| 2044 | if (drv->bdrv_reopen_prepare) { |
| 2045 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 2046 | if (ret) { |
| 2047 | if (local_err != NULL) { |
| 2048 | error_propagate(errp, local_err); |
| 2049 | } else { |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 2050 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 2051 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2052 | } |
| 2053 | goto error; |
| 2054 | } |
| 2055 | } else { |
| 2056 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 2057 | * handler for each supported drv. */ |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2058 | error_setg(errp, "Block format '%s' used by node '%s' " |
| 2059 | "does not support reopening files", drv->format_name, |
| 2060 | bdrv_get_device_or_node_name(reopen_state->bs)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2061 | ret = -1; |
| 2062 | goto error; |
| 2063 | } |
| 2064 | |
Kevin Wolf | 4d2cb09 | 2015-04-10 17:50:50 +0200 | [diff] [blame] | 2065 | /* Options that are not handled are only okay if they are unchanged |
| 2066 | * compared to the old state. It is expected that some options are only |
| 2067 | * used for the initial open, but not reopen (e.g. filename) */ |
| 2068 | if (qdict_size(reopen_state->options)) { |
| 2069 | const QDictEntry *entry = qdict_first(reopen_state->options); |
| 2070 | |
| 2071 | do { |
| 2072 | QString *new_obj = qobject_to_qstring(entry->value); |
| 2073 | const char *new = qstring_get_str(new_obj); |
| 2074 | const char *old = qdict_get_try_str(reopen_state->bs->options, |
| 2075 | entry->key); |
| 2076 | |
| 2077 | if (!old || strcmp(new, old)) { |
| 2078 | error_setg(errp, "Cannot change the option '%s'", entry->key); |
| 2079 | ret = -EINVAL; |
| 2080 | goto error; |
| 2081 | } |
| 2082 | } while ((entry = qdict_next(reopen_state->options, entry))); |
| 2083 | } |
| 2084 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2085 | ret = 0; |
| 2086 | |
| 2087 | error: |
Kevin Wolf | ccf9dc0 | 2015-05-08 17:24:56 +0200 | [diff] [blame] | 2088 | qemu_opts_del(opts); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2089 | return ret; |
| 2090 | } |
| 2091 | |
| 2092 | /* |
| 2093 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 2094 | * makes them final by swapping the staging BlockDriverState contents into |
| 2095 | * the active BlockDriverState contents. |
| 2096 | */ |
| 2097 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 2098 | { |
| 2099 | BlockDriver *drv; |
| 2100 | |
| 2101 | assert(reopen_state != NULL); |
| 2102 | drv = reopen_state->bs->drv; |
| 2103 | assert(drv != NULL); |
| 2104 | |
| 2105 | /* If there are any driver level actions to take */ |
| 2106 | if (drv->bdrv_reopen_commit) { |
| 2107 | drv->bdrv_reopen_commit(reopen_state); |
| 2108 | } |
| 2109 | |
| 2110 | /* set BDS specific flags now */ |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2111 | QDECREF(reopen_state->bs->explicit_options); |
| 2112 | |
| 2113 | reopen_state->bs->explicit_options = reopen_state->explicit_options; |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2114 | reopen_state->bs->open_flags = reopen_state->flags; |
| 2115 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & |
| 2116 | BDRV_O_CACHE_WB); |
| 2117 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 2118 | |
Kevin Wolf | 3baca89 | 2014-07-16 17:48:16 +0200 | [diff] [blame] | 2119 | bdrv_refresh_limits(reopen_state->bs, NULL); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2120 | } |
| 2121 | |
| 2122 | /* |
| 2123 | * Abort the reopen, and delete and free the staged changes in |
| 2124 | * reopen_state |
| 2125 | */ |
| 2126 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 2127 | { |
| 2128 | BlockDriver *drv; |
| 2129 | |
| 2130 | assert(reopen_state != NULL); |
| 2131 | drv = reopen_state->bs->drv; |
| 2132 | assert(drv != NULL); |
| 2133 | |
| 2134 | if (drv->bdrv_reopen_abort) { |
| 2135 | drv->bdrv_reopen_abort(reopen_state); |
| 2136 | } |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2137 | |
| 2138 | QDECREF(reopen_state->explicit_options); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 2139 | } |
| 2140 | |
| 2141 | |
Max Reitz | 64dff52 | 2016-01-29 16:36:10 +0100 | [diff] [blame] | 2142 | static void bdrv_close(BlockDriverState *bs) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2143 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 2144 | BdrvAioNotifier *ban, *ban_next; |
| 2145 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 2146 | assert(!bs->job); |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 2147 | |
| 2148 | /* Disable I/O limits and drain all pending throttled requests */ |
Alberto Garcia | a0d64a6 | 2015-11-04 15:15:36 +0200 | [diff] [blame] | 2149 | if (bs->throttle_state) { |
Alberto Garcia | 99b7e77 | 2015-09-25 16:41:44 +0300 | [diff] [blame] | 2150 | bdrv_io_limits_disable(bs); |
| 2151 | } |
| 2152 | |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 2153 | bdrv_drained_begin(bs); /* complete I/O */ |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 2154 | bdrv_flush(bs); |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 2155 | bdrv_drain(bs); /* in case flush left pending I/O */ |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 2156 | |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 2157 | bdrv_release_named_dirty_bitmaps(bs); |
| 2158 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
| 2159 | |
Max Reitz | b4d0282 | 2015-10-19 17:53:15 +0200 | [diff] [blame] | 2160 | if (bs->blk) { |
| 2161 | blk_dev_change_media_cb(bs->blk, false); |
| 2162 | } |
| 2163 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 2164 | if (bs->drv) { |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 2165 | BdrvChild *child, *next; |
| 2166 | |
Kevin Wolf | 9a7dedb | 2015-06-16 10:58:20 +0200 | [diff] [blame] | 2167 | bs->drv->bdrv_close(bs); |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 2168 | bs->drv = NULL; |
Kevin Wolf | 9a7dedb | 2015-06-16 10:58:20 +0200 | [diff] [blame] | 2169 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2170 | bdrv_set_backing_hd(bs, NULL); |
Kevin Wolf | 9a7dedb | 2015-06-16 10:58:20 +0200 | [diff] [blame] | 2171 | |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 2172 | if (bs->file != NULL) { |
| 2173 | bdrv_unref_child(bs, bs->file); |
| 2174 | bs->file = NULL; |
| 2175 | } |
| 2176 | |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 2177 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2178 | /* TODO Remove bdrv_unref() from drivers' close function and use |
| 2179 | * bdrv_unref_child() here */ |
Kevin Wolf | bddcec3 | 2015-04-09 18:47:50 +0200 | [diff] [blame] | 2180 | if (child->bs->inherits_from == bs) { |
| 2181 | child->bs->inherits_from = NULL; |
| 2182 | } |
Kevin Wolf | 33a6040 | 2015-06-15 13:51:04 +0200 | [diff] [blame] | 2183 | bdrv_detach_child(child); |
Kevin Wolf | 6e93e7c | 2015-04-08 13:49:41 +0200 | [diff] [blame] | 2184 | } |
| 2185 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2186 | g_free(bs->opaque); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2187 | bs->opaque = NULL; |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 2188 | bs->copy_on_read = 0; |
Paolo Bonzini | a275fa4 | 2012-05-08 16:51:43 +0200 | [diff] [blame] | 2189 | bs->backing_file[0] = '\0'; |
| 2190 | bs->backing_format[0] = '\0'; |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 2191 | bs->total_sectors = 0; |
| 2192 | bs->encrypted = 0; |
| 2193 | bs->valid_key = 0; |
| 2194 | bs->sg = 0; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 2195 | bs->zero_beyond_eof = false; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2196 | QDECREF(bs->options); |
Kevin Wolf | 145f598 | 2015-05-08 16:15:03 +0200 | [diff] [blame] | 2197 | QDECREF(bs->explicit_options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 2198 | bs->options = NULL; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 2199 | QDECREF(bs->full_open_options); |
| 2200 | bs->full_open_options = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2201 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 2202 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 2203 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 2204 | g_free(ban); |
| 2205 | } |
| 2206 | QLIST_INIT(&bs->aio_notifiers); |
Paolo Bonzini | fc27291 | 2015-12-23 11:48:24 +0100 | [diff] [blame] | 2207 | bdrv_drained_end(bs); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2208 | } |
| 2209 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 2210 | void bdrv_close_all(void) |
| 2211 | { |
| 2212 | BlockDriverState *bs; |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 2213 | AioContext *aio_context; |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 2214 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 2215 | /* Drop references from requests still in flight, such as canceled block |
| 2216 | * jobs whose AIO context has not been polled yet */ |
| 2217 | bdrv_drain_all(); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2218 | |
Max Reitz | ca9bd24 | 2016-01-29 16:36:14 +0100 | [diff] [blame] | 2219 | blk_remove_all_bs(); |
| 2220 | blockdev_close_all_bdrv_states(); |
| 2221 | |
| 2222 | /* Cancel all block jobs */ |
| 2223 | while (!QTAILQ_EMPTY(&all_bdrv_states)) { |
| 2224 | QTAILQ_FOREACH(bs, &all_bdrv_states, bs_list) { |
| 2225 | aio_context = bdrv_get_aio_context(bs); |
| 2226 | |
| 2227 | aio_context_acquire(aio_context); |
| 2228 | if (bs->job) { |
| 2229 | block_job_cancel_sync(bs->job); |
| 2230 | aio_context_release(aio_context); |
| 2231 | break; |
| 2232 | } |
| 2233 | aio_context_release(aio_context); |
| 2234 | } |
| 2235 | |
| 2236 | /* All the remaining BlockDriverStates are referenced directly or |
| 2237 | * indirectly from block jobs, so there needs to be at least one BDS |
| 2238 | * directly used by a block job */ |
| 2239 | assert(bs); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 2240 | } |
| 2241 | } |
| 2242 | |
Jeff Cody | f8aa905 | 2016-02-01 20:33:10 -0500 | [diff] [blame] | 2243 | /* Note that bs->device_list.tqe_prev is initially null, |
| 2244 | * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish |
| 2245 | * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by |
| 2246 | * resetting it to null on remove. */ |
| 2247 | void bdrv_device_remove(BlockDriverState *bs) |
| 2248 | { |
| 2249 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
| 2250 | bs->device_list.tqe_prev = NULL; |
| 2251 | } |
| 2252 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2253 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
| 2254 | * graph_bdrv_state list. |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2255 | Also, NULL terminate the device_name to prevent double remove */ |
| 2256 | void bdrv_make_anon(BlockDriverState *bs) |
| 2257 | { |
Jeff Cody | f8aa905 | 2016-02-01 20:33:10 -0500 | [diff] [blame] | 2258 | /* Take care to remove bs from bdrv_states only when it's actually |
| 2259 | * in it. */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2260 | if (bs->device_list.tqe_prev) { |
Jeff Cody | f8aa905 | 2016-02-01 20:33:10 -0500 | [diff] [blame] | 2261 | bdrv_device_remove(bs); |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2262 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2263 | if (bs->node_name[0] != '\0') { |
| 2264 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 2265 | } |
| 2266 | bs->node_name[0] = '\0'; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2267 | } |
| 2268 | |
Kevin Wolf | 8e419ae | 2015-09-16 16:18:38 +0200 | [diff] [blame] | 2269 | /* Fields that need to stay with the top-level BDS */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2270 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
| 2271 | BlockDriverState *bs_src) |
| 2272 | { |
| 2273 | /* move some fields that need to stay attached to the device */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2274 | |
| 2275 | /* dev info */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2276 | bs_dest->copy_on_read = bs_src->copy_on_read; |
| 2277 | |
| 2278 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
| 2279 | |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2280 | /* dirty bitmap */ |
| 2281 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
| 2282 | } |
| 2283 | |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2284 | static void change_parent_backing_link(BlockDriverState *from, |
| 2285 | BlockDriverState *to) |
| 2286 | { |
| 2287 | BdrvChild *c, *next; |
| 2288 | |
| 2289 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
| 2290 | assert(c->role != &child_backing); |
| 2291 | c->bs = to; |
| 2292 | QLIST_REMOVE(c, next_parent); |
| 2293 | QLIST_INSERT_HEAD(&to->parents, c, next_parent); |
| 2294 | bdrv_ref(to); |
| 2295 | bdrv_unref(from); |
| 2296 | } |
| 2297 | if (from->blk) { |
| 2298 | blk_set_bs(from->blk, to); |
| 2299 | if (!to->device_list.tqe_prev) { |
| 2300 | QTAILQ_INSERT_BEFORE(from, to, device_list); |
| 2301 | } |
Jeff Cody | f8aa905 | 2016-02-01 20:33:10 -0500 | [diff] [blame] | 2302 | bdrv_device_remove(from); |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2303 | } |
| 2304 | } |
| 2305 | |
| 2306 | static void swap_feature_fields(BlockDriverState *bs_top, |
| 2307 | BlockDriverState *bs_new) |
| 2308 | { |
| 2309 | BlockDriverState tmp; |
| 2310 | |
| 2311 | bdrv_move_feature_fields(&tmp, bs_top); |
| 2312 | bdrv_move_feature_fields(bs_top, bs_new); |
| 2313 | bdrv_move_feature_fields(bs_new, &tmp); |
| 2314 | |
| 2315 | assert(!bs_new->throttle_state); |
| 2316 | if (bs_top->throttle_state) { |
| 2317 | assert(bs_top->io_limits_enabled); |
| 2318 | bdrv_io_limits_enable(bs_new, throttle_group_get_name(bs_top)); |
| 2319 | bdrv_io_limits_disable(bs_top); |
| 2320 | } |
| 2321 | } |
| 2322 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2323 | /* |
| 2324 | * Add new bs contents at the top of an image chain while the chain is |
| 2325 | * live, while keeping required fields on the top layer. |
| 2326 | * |
| 2327 | * This will modify the BlockDriverState fields, and swap contents |
| 2328 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 2329 | * |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 2330 | * bs_new must not be attached to a BlockBackend. |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 2331 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2332 | * This function does not create any image files. |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2333 | * |
| 2334 | * bdrv_append() takes ownership of a bs_new reference and unrefs it because |
| 2335 | * that's what the callers commonly need. bs_new will be referenced by the old |
| 2336 | * parents of bs_top after bdrv_append() returns. If the caller needs to keep a |
| 2337 | * reference of its own, it must call bdrv_ref(). |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2338 | */ |
| 2339 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) |
| 2340 | { |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2341 | assert(!bdrv_requests_pending(bs_top)); |
| 2342 | assert(!bdrv_requests_pending(bs_new)); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2343 | |
Kevin Wolf | dd62f1c | 2015-06-18 14:09:57 +0200 | [diff] [blame] | 2344 | bdrv_ref(bs_top); |
| 2345 | change_parent_backing_link(bs_top, bs_new); |
| 2346 | |
| 2347 | /* Some fields always stay on top of the backing file chain */ |
| 2348 | swap_feature_fields(bs_top, bs_new); |
| 2349 | |
| 2350 | bdrv_set_backing_hd(bs_new, bs_top); |
| 2351 | bdrv_unref(bs_top); |
| 2352 | |
| 2353 | /* bs_new is now referenced by its new parents, we don't need the |
| 2354 | * additional reference any more. */ |
| 2355 | bdrv_unref(bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2356 | } |
| 2357 | |
Kevin Wolf | 3f09bfb | 2015-09-15 11:58:23 +0200 | [diff] [blame] | 2358 | void bdrv_replace_in_backing_chain(BlockDriverState *old, BlockDriverState *new) |
| 2359 | { |
| 2360 | assert(!bdrv_requests_pending(old)); |
| 2361 | assert(!bdrv_requests_pending(new)); |
| 2362 | |
| 2363 | bdrv_ref(old); |
| 2364 | |
| 2365 | if (old->blk) { |
| 2366 | /* As long as these fields aren't in BlockBackend, but in the top-level |
| 2367 | * BlockDriverState, it's not possible for a BDS to have two BBs. |
| 2368 | * |
| 2369 | * We really want to copy the fields from old to new, but we go for a |
| 2370 | * swap instead so that pointers aren't duplicated and cause trouble. |
| 2371 | * (Also, bdrv_swap() used to do the same.) */ |
| 2372 | assert(!new->blk); |
| 2373 | swap_feature_fields(old, new); |
| 2374 | } |
| 2375 | change_parent_backing_link(old, new); |
| 2376 | |
| 2377 | /* Change backing files if a previously independent node is added to the |
| 2378 | * chain. For active commit, we replace top by its own (indirect) backing |
| 2379 | * file and don't do anything here so we don't build a loop. */ |
| 2380 | if (new->backing == NULL && !bdrv_chain_contains(backing_bs(old), new)) { |
| 2381 | bdrv_set_backing_hd(new, backing_bs(old)); |
| 2382 | bdrv_set_backing_hd(old, NULL); |
| 2383 | } |
| 2384 | |
| 2385 | bdrv_unref(old); |
| 2386 | } |
| 2387 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2388 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2389 | { |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 2390 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2391 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2392 | assert(!bs->refcnt); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2393 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 2394 | bdrv_close(bs); |
| 2395 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 2396 | /* remove from list, if necessary */ |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2397 | bdrv_make_anon(bs); |
aurel32 | 34c6f05 | 2008-04-08 19:51:21 +0000 | [diff] [blame] | 2398 | |
Max Reitz | 2c1d04e | 2016-01-29 16:36:11 +0100 | [diff] [blame] | 2399 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
| 2400 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2401 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2402 | } |
| 2403 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2404 | /* |
| 2405 | * Run consistency checks on an image |
| 2406 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2407 | * 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] | 2408 | * 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] | 2409 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2410 | */ |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2411 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2412 | { |
Max Reitz | 908bcd5 | 2014-08-07 22:47:55 +0200 | [diff] [blame] | 2413 | if (bs->drv == NULL) { |
| 2414 | return -ENOMEDIUM; |
| 2415 | } |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2416 | if (bs->drv->bdrv_check == NULL) { |
| 2417 | return -ENOTSUP; |
| 2418 | } |
| 2419 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2420 | memset(res, 0, sizeof(*res)); |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2421 | return bs->drv->bdrv_check(bs, res, fix); |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2422 | } |
| 2423 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2424 | #define COMMIT_BUF_SECTORS 2048 |
| 2425 | |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2426 | /* commit COW file into the raw image */ |
| 2427 | int bdrv_commit(BlockDriverState *bs) |
| 2428 | { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2429 | BlockDriver *drv = bs->drv; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2430 | int64_t sector, total_sectors, length, backing_length; |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2431 | int n, ro, open_flags; |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2432 | int ret = 0; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2433 | uint8_t *buf = NULL; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2434 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2435 | if (!drv) |
| 2436 | return -ENOMEDIUM; |
Liu Yuan | 6bb4515 | 2014-09-01 13:35:21 +0800 | [diff] [blame] | 2437 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2438 | if (!bs->backing) { |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2439 | return -ENOTSUP; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2440 | } |
| 2441 | |
Fam Zheng | bb00021 | 2014-09-11 13:14:00 +0800 | [diff] [blame] | 2442 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2443 | bdrv_op_is_blocked(bs->backing->bs, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { |
Stefan Hajnoczi | 2d3735d | 2012-01-18 14:40:41 +0000 | [diff] [blame] | 2444 | return -EBUSY; |
| 2445 | } |
| 2446 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2447 | ro = bs->backing->bs->read_only; |
| 2448 | open_flags = bs->backing->bs->open_flags; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2449 | |
| 2450 | if (ro) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2451 | if (bdrv_reopen(bs->backing->bs, open_flags | BDRV_O_RDWR, NULL)) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2452 | return -EACCES; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2453 | } |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2454 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2455 | |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2456 | length = bdrv_getlength(bs); |
| 2457 | if (length < 0) { |
| 2458 | ret = length; |
| 2459 | goto ro_cleanup; |
| 2460 | } |
| 2461 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2462 | backing_length = bdrv_getlength(bs->backing->bs); |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2463 | if (backing_length < 0) { |
| 2464 | ret = backing_length; |
| 2465 | goto ro_cleanup; |
| 2466 | } |
| 2467 | |
| 2468 | /* If our top snapshot is larger than the backing file image, |
| 2469 | * grow the backing file image if possible. If not possible, |
| 2470 | * we must return an error */ |
| 2471 | if (length > backing_length) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2472 | ret = bdrv_truncate(bs->backing->bs, length); |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2473 | if (ret < 0) { |
| 2474 | goto ro_cleanup; |
| 2475 | } |
| 2476 | } |
| 2477 | |
| 2478 | total_sectors = length >> BDRV_SECTOR_BITS; |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2479 | |
| 2480 | /* qemu_try_blockalign() for bs will choose an alignment that works for |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2481 | * bs->backing->bs as well, so no need to compare the alignment manually. */ |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2482 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
| 2483 | if (buf == NULL) { |
| 2484 | ret = -ENOMEM; |
| 2485 | goto ro_cleanup; |
| 2486 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2487 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2488 | for (sector = 0; sector < total_sectors; sector += n) { |
Paolo Bonzini | d663640 | 2013-09-04 19:00:25 +0200 | [diff] [blame] | 2489 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
| 2490 | if (ret < 0) { |
| 2491 | goto ro_cleanup; |
| 2492 | } |
| 2493 | if (ret) { |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2494 | ret = bdrv_read(bs, sector, buf, n); |
| 2495 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2496 | goto ro_cleanup; |
| 2497 | } |
| 2498 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2499 | ret = bdrv_write(bs->backing->bs, sector, buf, n); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2500 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2501 | goto ro_cleanup; |
| 2502 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2503 | } |
| 2504 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2505 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2506 | if (drv->bdrv_make_empty) { |
| 2507 | ret = drv->bdrv_make_empty(bs); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2508 | if (ret < 0) { |
| 2509 | goto ro_cleanup; |
| 2510 | } |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2511 | bdrv_flush(bs); |
| 2512 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2513 | |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2514 | /* |
| 2515 | * Make sure all data we wrote to the backing device is actually |
| 2516 | * stable on disk. |
| 2517 | */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2518 | if (bs->backing) { |
| 2519 | bdrv_flush(bs->backing->bs); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2520 | } |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2521 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2522 | ret = 0; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2523 | ro_cleanup: |
Kevin Wolf | 857d4f4 | 2014-05-20 13:16:51 +0200 | [diff] [blame] | 2524 | qemu_vfree(buf); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2525 | |
| 2526 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2527 | /* ignoring error return here */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2528 | bdrv_reopen(bs->backing->bs, open_flags & ~BDRV_O_RDWR, NULL); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2529 | } |
| 2530 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2531 | return ret; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2532 | } |
| 2533 | |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2534 | int bdrv_commit_all(void) |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2535 | { |
| 2536 | BlockDriverState *bs; |
| 2537 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2538 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2539 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2540 | |
| 2541 | aio_context_acquire(aio_context); |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2542 | if (bs->drv && bs->backing) { |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2543 | int ret = bdrv_commit(bs); |
| 2544 | if (ret < 0) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2545 | aio_context_release(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2546 | return ret; |
| 2547 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2548 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2549 | aio_context_release(aio_context); |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2550 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2551 | return 0; |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2552 | } |
| 2553 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2554 | /* |
| 2555 | * Return values: |
| 2556 | * 0 - success |
| 2557 | * -EINVAL - backing format specified, but no file |
| 2558 | * -ENOSPC - can't update the backing file because no space is left in the |
| 2559 | * image file header |
| 2560 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 2561 | */ |
| 2562 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 2563 | const char *backing_file, const char *backing_fmt) |
| 2564 | { |
| 2565 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2566 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2567 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 2568 | /* Backing file format doesn't make sense without a backing file */ |
| 2569 | if (backing_fmt && !backing_file) { |
| 2570 | return -EINVAL; |
| 2571 | } |
| 2572 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2573 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2574 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2575 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2576 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2577 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2578 | |
| 2579 | if (ret == 0) { |
| 2580 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 2581 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 2582 | } |
| 2583 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2584 | } |
| 2585 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2586 | /* |
| 2587 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 2588 | * |
| 2589 | * active is the current topmost image. |
| 2590 | * |
| 2591 | * Returns NULL if bs is not found in active's image chain, |
| 2592 | * or if active == bs. |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2593 | * |
| 2594 | * Returns the bottommost base image if bs == NULL. |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2595 | */ |
| 2596 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 2597 | BlockDriverState *bs) |
| 2598 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2599 | while (active && bs != backing_bs(active)) { |
| 2600 | active = backing_bs(active); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2601 | } |
| 2602 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2603 | return active; |
| 2604 | } |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2605 | |
Jeff Cody | 4caf0fc | 2014-06-25 15:35:26 -0400 | [diff] [blame] | 2606 | /* Given a BDS, searches for the base layer. */ |
| 2607 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 2608 | { |
| 2609 | return bdrv_find_overlay(bs, NULL); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2610 | } |
| 2611 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2612 | /* |
| 2613 | * Drops images above 'base' up to and including 'top', and sets the image |
| 2614 | * above 'top' to have base as its backing file. |
| 2615 | * |
| 2616 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 2617 | * information in 'bs' can be properly updated. |
| 2618 | * |
| 2619 | * E.g., this will convert the following chain: |
| 2620 | * bottom <- base <- intermediate <- top <- active |
| 2621 | * |
| 2622 | * to |
| 2623 | * |
| 2624 | * bottom <- base <- active |
| 2625 | * |
| 2626 | * It is allowed for bottom==base, in which case it converts: |
| 2627 | * |
| 2628 | * base <- intermediate <- top <- active |
| 2629 | * |
| 2630 | * to |
| 2631 | * |
| 2632 | * base <- active |
| 2633 | * |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2634 | * If backing_file_str is non-NULL, it will be used when modifying top's |
| 2635 | * overlay image metadata. |
| 2636 | * |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2637 | * Error conditions: |
| 2638 | * if active == top, that is considered an error |
| 2639 | * |
| 2640 | */ |
| 2641 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2642 | BlockDriverState *base, const char *backing_file_str) |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2643 | { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2644 | BlockDriverState *new_top_bs = NULL; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2645 | int ret = -EIO; |
| 2646 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2647 | if (!top->drv || !base->drv) { |
| 2648 | goto exit; |
| 2649 | } |
| 2650 | |
| 2651 | new_top_bs = bdrv_find_overlay(active, top); |
| 2652 | |
| 2653 | if (new_top_bs == NULL) { |
| 2654 | /* we could not find the image above 'top', this is an error */ |
| 2655 | goto exit; |
| 2656 | } |
| 2657 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2658 | /* special case of new_top_bs->backing->bs already pointing to base - nothing |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2659 | * to do, no intermediate images */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2660 | if (backing_bs(new_top_bs) == base) { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2661 | ret = 0; |
| 2662 | goto exit; |
| 2663 | } |
| 2664 | |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2665 | /* Make sure that base is in the backing chain of top */ |
| 2666 | if (!bdrv_chain_contains(top, base)) { |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2667 | goto exit; |
| 2668 | } |
| 2669 | |
| 2670 | /* success - we can delete the intermediate states, and link top->base */ |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2671 | backing_file_str = backing_file_str ? backing_file_str : base->filename; |
Jeff Cody | 54e2690 | 2014-06-25 15:40:10 -0400 | [diff] [blame] | 2672 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2673 | base->drv ? base->drv->format_name : ""); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2674 | if (ret) { |
| 2675 | goto exit; |
| 2676 | } |
Kevin Wolf | 5db15a5 | 2015-09-14 15:33:33 +0200 | [diff] [blame] | 2677 | bdrv_set_backing_hd(new_top_bs, base); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2678 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2679 | ret = 0; |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2680 | exit: |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2681 | return ret; |
| 2682 | } |
| 2683 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2684 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2685 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 2686 | */ |
| 2687 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 2688 | { |
| 2689 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2690 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2691 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2692 | return -ENOMEDIUM; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2693 | if (!drv->bdrv_truncate) |
| 2694 | return -ENOTSUP; |
Naphtali Sprei | 59f2689 | 2009-10-26 16:25:16 +0200 | [diff] [blame] | 2695 | if (bs->read_only) |
| 2696 | return -EACCES; |
Jeff Cody | 9c75e16 | 2014-06-25 16:55:30 -0400 | [diff] [blame] | 2697 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2698 | ret = drv->bdrv_truncate(bs, offset); |
| 2699 | if (ret == 0) { |
| 2700 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 2701 | bdrv_dirty_bitmap_truncate(bs); |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 2702 | if (bs->blk) { |
| 2703 | blk_dev_resize_cb(bs->blk); |
| 2704 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2705 | } |
| 2706 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2707 | } |
| 2708 | |
| 2709 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 2710 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 2711 | * allocated space. Return < 0 if error or unknown. |
| 2712 | */ |
| 2713 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 2714 | { |
| 2715 | BlockDriver *drv = bs->drv; |
| 2716 | if (!drv) { |
| 2717 | return -ENOMEDIUM; |
| 2718 | } |
| 2719 | if (drv->bdrv_get_allocated_file_size) { |
| 2720 | return drv->bdrv_get_allocated_file_size(bs); |
| 2721 | } |
| 2722 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 2723 | return bdrv_get_allocated_file_size(bs->file->bs); |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 2724 | } |
| 2725 | return -ENOTSUP; |
| 2726 | } |
| 2727 | |
| 2728 | /** |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2729 | * Return number of sectors on success, -errno on error. |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2730 | */ |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2731 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2732 | { |
| 2733 | BlockDriver *drv = bs->drv; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2734 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2735 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2736 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 2737 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 2738 | if (drv->has_variable_length) { |
| 2739 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 2740 | if (ret < 0) { |
| 2741 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 2742 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2743 | } |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2744 | return bs->total_sectors; |
| 2745 | } |
| 2746 | |
| 2747 | /** |
| 2748 | * Return length in bytes on success, -errno on error. |
| 2749 | * The length is always a multiple of BDRV_SECTOR_SIZE. |
| 2750 | */ |
| 2751 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 2752 | { |
| 2753 | int64_t ret = bdrv_nb_sectors(bs); |
| 2754 | |
Fam Zheng | 4a9c9ea | 2015-05-15 16:36:05 +0800 | [diff] [blame] | 2755 | ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2756 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2757 | } |
| 2758 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2759 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 2760 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2761 | { |
Markus Armbruster | 65a9bb2 | 2014-06-26 13:23:17 +0200 | [diff] [blame] | 2762 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
| 2763 | |
| 2764 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2765 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 2766 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2767 | int bdrv_is_read_only(BlockDriverState *bs) |
| 2768 | { |
| 2769 | return bs->read_only; |
| 2770 | } |
| 2771 | |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 2772 | int bdrv_is_sg(BlockDriverState *bs) |
| 2773 | { |
| 2774 | return bs->sg; |
| 2775 | } |
| 2776 | |
Christoph Hellwig | e900a7b | 2009-09-04 19:01:15 +0200 | [diff] [blame] | 2777 | int bdrv_enable_write_cache(BlockDriverState *bs) |
| 2778 | { |
| 2779 | return bs->enable_write_cache; |
| 2780 | } |
| 2781 | |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 2782 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
| 2783 | { |
| 2784 | bs->enable_write_cache = wce; |
Jeff Cody | 55b110f | 2012-09-20 15:13:18 -0400 | [diff] [blame] | 2785 | |
| 2786 | /* so a reopen() will preserve wce */ |
| 2787 | if (wce) { |
| 2788 | bs->open_flags |= BDRV_O_CACHE_WB; |
| 2789 | } else { |
| 2790 | bs->open_flags &= ~BDRV_O_CACHE_WB; |
| 2791 | } |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 2792 | } |
| 2793 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2794 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 2795 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2796 | if (bs->backing && bs->backing->bs->encrypted) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2797 | return 1; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2798 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2799 | return bs->encrypted; |
| 2800 | } |
| 2801 | |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2802 | int bdrv_key_required(BlockDriverState *bs) |
| 2803 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2804 | BdrvChild *backing = bs->backing; |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2805 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2806 | if (backing && backing->bs->encrypted && !backing->bs->valid_key) { |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2807 | return 1; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2808 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2809 | return (bs->encrypted && !bs->valid_key); |
| 2810 | } |
| 2811 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2812 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 2813 | { |
| 2814 | int ret; |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2815 | if (bs->backing && bs->backing->bs->encrypted) { |
| 2816 | ret = bdrv_set_key(bs->backing->bs, key); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2817 | if (ret < 0) |
| 2818 | return ret; |
| 2819 | if (!bs->encrypted) |
| 2820 | return 0; |
| 2821 | } |
Shahar Havivi | fd04a2a | 2010-03-06 00:26:13 +0200 | [diff] [blame] | 2822 | if (!bs->encrypted) { |
| 2823 | return -EINVAL; |
| 2824 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 2825 | return -ENOMEDIUM; |
| 2826 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2827 | ret = bs->drv->bdrv_set_key(bs, key); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 2828 | if (ret < 0) { |
| 2829 | bs->valid_key = 0; |
| 2830 | } else if (!bs->valid_key) { |
| 2831 | bs->valid_key = 1; |
Markus Armbruster | a7f53e2 | 2014-10-07 13:59:25 +0200 | [diff] [blame] | 2832 | if (bs->blk) { |
| 2833 | /* call the change callback now, we skipped it on open */ |
| 2834 | blk_dev_change_media_cb(bs->blk, true); |
| 2835 | } |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 2836 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 2837 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2838 | } |
| 2839 | |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2840 | /* |
| 2841 | * Provide an encryption key for @bs. |
| 2842 | * If @key is non-null: |
| 2843 | * If @bs is not encrypted, fail. |
| 2844 | * Else if the key is invalid, fail. |
| 2845 | * Else set @bs's key to @key, replacing the existing key, if any. |
| 2846 | * If @key is null: |
| 2847 | * If @bs is encrypted and still lacks a key, fail. |
| 2848 | * Else do nothing. |
| 2849 | * On failure, store an error object through @errp if non-null. |
| 2850 | */ |
| 2851 | void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp) |
| 2852 | { |
| 2853 | if (key) { |
| 2854 | if (!bdrv_is_encrypted(bs)) { |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2855 | error_setg(errp, "Node '%s' is not encrypted", |
| 2856 | bdrv_get_device_or_node_name(bs)); |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2857 | } else if (bdrv_set_key(bs, key) < 0) { |
Markus Armbruster | c6bd8c7 | 2015-03-17 11:54:50 +0100 | [diff] [blame] | 2858 | error_setg(errp, QERR_INVALID_PASSWORD); |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2859 | } |
| 2860 | } else { |
| 2861 | if (bdrv_key_required(bs)) { |
Markus Armbruster | b1ca639 | 2015-01-29 10:37:01 +0100 | [diff] [blame] | 2862 | error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED, |
| 2863 | "'%s' (%s) is encrypted", |
Alberto Garcia | 81e5f78 | 2015-04-08 12:29:19 +0300 | [diff] [blame] | 2864 | bdrv_get_device_or_node_name(bs), |
Markus Armbruster | 4d2855a | 2015-01-29 10:37:00 +0100 | [diff] [blame] | 2865 | bdrv_get_encrypted_filename(bs)); |
| 2866 | } |
| 2867 | } |
| 2868 | } |
| 2869 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 2870 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2871 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 2872 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2873 | } |
| 2874 | |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2875 | static int qsort_strcmp(const void *a, const void *b) |
| 2876 | { |
| 2877 | return strcmp(a, b); |
| 2878 | } |
| 2879 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2880 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2881 | void *opaque) |
| 2882 | { |
| 2883 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2884 | int count = 0; |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2885 | int i; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2886 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2887 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 2888 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2889 | if (drv->format_name) { |
| 2890 | bool found = false; |
| 2891 | int i = count; |
| 2892 | while (formats && i && !found) { |
| 2893 | found = !strcmp(formats[--i], drv->format_name); |
| 2894 | } |
| 2895 | |
| 2896 | if (!found) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 2897 | formats = g_renew(const char *, formats, count + 1); |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2898 | formats[count++] = drv->format_name; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2899 | } |
| 2900 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2901 | } |
Stefan Hajnoczi | ada4240 | 2014-08-27 12:08:55 +0100 | [diff] [blame] | 2902 | |
| 2903 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
| 2904 | |
| 2905 | for (i = 0; i < count; i++) { |
| 2906 | it(opaque, formats[i]); |
| 2907 | } |
| 2908 | |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 2909 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2910 | } |
| 2911 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2912 | /* This function is to find a node in the bs graph */ |
| 2913 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 2914 | { |
| 2915 | BlockDriverState *bs; |
| 2916 | |
| 2917 | assert(node_name); |
| 2918 | |
| 2919 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 2920 | if (!strcmp(node_name, bs->node_name)) { |
| 2921 | return bs; |
| 2922 | } |
| 2923 | } |
| 2924 | return NULL; |
| 2925 | } |
| 2926 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2927 | /* 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] | 2928 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2929 | { |
| 2930 | BlockDeviceInfoList *list, *entry; |
| 2931 | BlockDriverState *bs; |
| 2932 | |
| 2933 | list = NULL; |
| 2934 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 2935 | BlockDeviceInfo *info = bdrv_block_device_info(bs, errp); |
| 2936 | if (!info) { |
| 2937 | qapi_free_BlockDeviceInfoList(list); |
| 2938 | return NULL; |
| 2939 | } |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2940 | entry = g_malloc0(sizeof(*entry)); |
Alberto Garcia | d5a8ee6 | 2015-04-17 14:52:43 +0300 | [diff] [blame] | 2941 | entry->value = info; |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 2942 | entry->next = list; |
| 2943 | list = entry; |
| 2944 | } |
| 2945 | |
| 2946 | return list; |
| 2947 | } |
| 2948 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2949 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 2950 | const char *node_name, |
| 2951 | Error **errp) |
| 2952 | { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2953 | BlockBackend *blk; |
| 2954 | BlockDriverState *bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2955 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2956 | if (device) { |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2957 | blk = blk_by_name(device); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2958 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 2959 | if (blk) { |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 2960 | bs = blk_bs(blk); |
| 2961 | if (!bs) { |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 2962 | error_setg(errp, "Device '%s' has no medium", device); |
Max Reitz | 5433c24 | 2015-10-19 17:53:29 +0200 | [diff] [blame] | 2963 | } |
| 2964 | |
Alberto Garcia | 9f4ed6f | 2015-10-26 16:46:49 +0200 | [diff] [blame] | 2965 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2966 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2967 | } |
| 2968 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2969 | if (node_name) { |
| 2970 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2971 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2972 | if (bs) { |
| 2973 | return bs; |
| 2974 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2975 | } |
| 2976 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 2977 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 2978 | device ? device : "", |
| 2979 | node_name ? node_name : ""); |
| 2980 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 2981 | } |
| 2982 | |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 2983 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
| 2984 | * return false. If either argument is NULL, return false. */ |
| 2985 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) |
| 2986 | { |
| 2987 | while (top && top != base) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 2988 | top = backing_bs(top); |
Jeff Cody | 5a6684d | 2014-06-25 15:40:09 -0400 | [diff] [blame] | 2989 | } |
| 2990 | |
| 2991 | return top != NULL; |
| 2992 | } |
| 2993 | |
Fam Zheng | 04df765 | 2014-10-31 11:32:54 +0800 | [diff] [blame] | 2994 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
| 2995 | { |
| 2996 | if (!bs) { |
| 2997 | return QTAILQ_FIRST(&graph_bdrv_states); |
| 2998 | } |
| 2999 | return QTAILQ_NEXT(bs, node_list); |
| 3000 | } |
| 3001 | |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3002 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 3003 | { |
| 3004 | if (!bs) { |
| 3005 | return QTAILQ_FIRST(&bdrv_states); |
| 3006 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3007 | return QTAILQ_NEXT(bs, device_list); |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3008 | } |
| 3009 | |
Fam Zheng | 20a9e77 | 2014-10-31 11:32:55 +0800 | [diff] [blame] | 3010 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
| 3011 | { |
| 3012 | return bs->node_name; |
| 3013 | } |
| 3014 | |
Markus Armbruster | 7f06d47 | 2014-10-07 13:59:12 +0200 | [diff] [blame] | 3015 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3016 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3017 | { |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3018 | return bs->blk ? blk_name(bs->blk) : ""; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3019 | } |
| 3020 | |
Alberto Garcia | 9b2aa84 | 2015-04-08 12:29:18 +0300 | [diff] [blame] | 3021 | /* This can be used to identify nodes that might not have a device |
| 3022 | * name associated. Since node and device names live in the same |
| 3023 | * namespace, the result is unambiguous. The exception is if both are |
| 3024 | * absent, then this returns an empty (non-null) string. */ |
| 3025 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) |
| 3026 | { |
| 3027 | return bs->blk ? blk_name(bs->blk) : bs->node_name; |
| 3028 | } |
| 3029 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 3030 | int bdrv_get_flags(BlockDriverState *bs) |
| 3031 | { |
| 3032 | return bs->open_flags; |
| 3033 | } |
| 3034 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3035 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 3036 | { |
| 3037 | return 1; |
| 3038 | } |
| 3039 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3040 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 3041 | { |
| 3042 | assert(bs->drv); |
| 3043 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 3044 | /* If BS is a copy on write image, it is initialized to |
| 3045 | the contents of the base image, which may not be zeroes. */ |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3046 | if (bs->backing) { |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 3047 | return 0; |
| 3048 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 3049 | if (bs->drv->bdrv_has_zero_init) { |
| 3050 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3051 | } |
| 3052 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3053 | /* safe default */ |
| 3054 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3055 | } |
| 3056 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 3057 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 3058 | { |
| 3059 | BlockDriverInfo bdi; |
| 3060 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3061 | if (bs->backing) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 3062 | return false; |
| 3063 | } |
| 3064 | |
| 3065 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3066 | return bdi.unallocated_blocks_are_zero; |
| 3067 | } |
| 3068 | |
| 3069 | return false; |
| 3070 | } |
| 3071 | |
| 3072 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 3073 | { |
| 3074 | BlockDriverInfo bdi; |
| 3075 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3076 | if (bs->backing || !(bs->open_flags & BDRV_O_UNMAP)) { |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 3077 | return false; |
| 3078 | } |
| 3079 | |
| 3080 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3081 | return bdi.can_write_zeroes_with_unmap; |
| 3082 | } |
| 3083 | |
| 3084 | return false; |
| 3085 | } |
| 3086 | |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 3087 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 3088 | { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3089 | if (bs->backing && bs->backing->bs->encrypted) |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 3090 | return bs->backing_file; |
| 3091 | else if (bs->encrypted) |
| 3092 | return bs->filename; |
| 3093 | else |
| 3094 | return NULL; |
| 3095 | } |
| 3096 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3097 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3098 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3099 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 3100 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3101 | } |
| 3102 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 3103 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 3104 | { |
| 3105 | BlockDriver *drv = bs->drv; |
| 3106 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3107 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 3108 | if (!drv->bdrv_get_info) |
| 3109 | return -ENOTSUP; |
| 3110 | memset(bdi, 0, sizeof(*bdi)); |
| 3111 | return drv->bdrv_get_info(bs, bdi); |
| 3112 | } |
| 3113 | |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 3114 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
| 3115 | { |
| 3116 | BlockDriver *drv = bs->drv; |
| 3117 | if (drv && drv->bdrv_get_specific_info) { |
| 3118 | return drv->bdrv_get_specific_info(bs); |
| 3119 | } |
| 3120 | return NULL; |
| 3121 | } |
| 3122 | |
Eric Blake | a31939e | 2015-11-18 01:52:54 -0700 | [diff] [blame] | 3123 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3124 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 3125 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3126 | return; |
| 3127 | } |
| 3128 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 3129 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3130 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3131 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3132 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 3133 | const char *tag) |
| 3134 | { |
| 3135 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3136 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3137 | } |
| 3138 | |
| 3139 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 3140 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 3141 | } |
| 3142 | |
| 3143 | return -ENOTSUP; |
| 3144 | } |
| 3145 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 3146 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 3147 | { |
| 3148 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3149 | bs = bs->file ? bs->file->bs : NULL; |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 3150 | } |
| 3151 | |
| 3152 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 3153 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 3154 | } |
| 3155 | |
| 3156 | return -ENOTSUP; |
| 3157 | } |
| 3158 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3159 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 3160 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 3161 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3162 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3163 | } |
| 3164 | |
| 3165 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 3166 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 3167 | } |
| 3168 | |
| 3169 | return -ENOTSUP; |
| 3170 | } |
| 3171 | |
| 3172 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 3173 | { |
| 3174 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3175 | bs = bs->file ? bs->file->bs : NULL; |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 3176 | } |
| 3177 | |
| 3178 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 3179 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 3180 | } |
| 3181 | |
| 3182 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 3183 | } |
| 3184 | |
Blue Swirl | 199630b | 2010-07-25 20:49:34 +0000 | [diff] [blame] | 3185 | int bdrv_is_snapshot(BlockDriverState *bs) |
| 3186 | { |
| 3187 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
| 3188 | } |
| 3189 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3190 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 3191 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 3192 | * from a BDS as backing_file should not be done, as that may be relative to |
| 3193 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3194 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 3195 | const char *backing_file) |
| 3196 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3197 | char *filename_full = NULL; |
| 3198 | char *backing_file_full = NULL; |
| 3199 | char *filename_tmp = NULL; |
| 3200 | int is_protocol = 0; |
| 3201 | BlockDriverState *curr_bs = NULL; |
| 3202 | BlockDriverState *retval = NULL; |
| 3203 | |
| 3204 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3205 | return NULL; |
| 3206 | } |
| 3207 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3208 | filename_full = g_malloc(PATH_MAX); |
| 3209 | backing_file_full = g_malloc(PATH_MAX); |
| 3210 | filename_tmp = g_malloc(PATH_MAX); |
| 3211 | |
| 3212 | is_protocol = path_has_protocol(backing_file); |
| 3213 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3214 | for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3215 | |
| 3216 | /* If either of the filename paths is actually a protocol, then |
| 3217 | * compare unmodified paths; otherwise make paths relative */ |
| 3218 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 3219 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3220 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3221 | break; |
| 3222 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3223 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3224 | /* If not an absolute filename path, make it relative to the current |
| 3225 | * image's filename path */ |
| 3226 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 3227 | backing_file); |
| 3228 | |
| 3229 | /* We are going to compare absolute pathnames */ |
| 3230 | if (!realpath(filename_tmp, filename_full)) { |
| 3231 | continue; |
| 3232 | } |
| 3233 | |
| 3234 | /* We need to make sure the backing filename we are comparing against |
| 3235 | * is relative to the current image filename (or absolute) */ |
| 3236 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 3237 | curr_bs->backing_file); |
| 3238 | |
| 3239 | if (!realpath(filename_tmp, backing_file_full)) { |
| 3240 | continue; |
| 3241 | } |
| 3242 | |
| 3243 | if (strcmp(backing_file_full, filename_full) == 0) { |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3244 | retval = curr_bs->backing->bs; |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3245 | break; |
| 3246 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3247 | } |
| 3248 | } |
| 3249 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 3250 | g_free(filename_full); |
| 3251 | g_free(backing_file_full); |
| 3252 | g_free(filename_tmp); |
| 3253 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 3254 | } |
| 3255 | |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 3256 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
| 3257 | { |
| 3258 | if (!bs->drv) { |
| 3259 | return 0; |
| 3260 | } |
| 3261 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3262 | if (!bs->backing) { |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 3263 | return 0; |
| 3264 | } |
| 3265 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 3266 | return 1 + bdrv_get_backing_file_depth(bs->backing->bs); |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 3267 | } |
| 3268 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3269 | void bdrv_init(void) |
| 3270 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 3271 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3272 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 3273 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 3274 | void bdrv_init_with_whitelist(void) |
| 3275 | { |
| 3276 | use_bdrv_whitelist = 1; |
| 3277 | bdrv_init(); |
| 3278 | } |
| 3279 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3280 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3281 | { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3282 | Error *local_err = NULL; |
| 3283 | int ret; |
| 3284 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3285 | if (!bs->drv) { |
| 3286 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3287 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3288 | |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 3289 | if (!(bs->open_flags & BDRV_O_INACTIVE)) { |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 3290 | return; |
| 3291 | } |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 3292 | bs->open_flags &= ~BDRV_O_INACTIVE; |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 3293 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3294 | if (bs->drv->bdrv_invalidate_cache) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3295 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3296 | } else if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 3297 | bdrv_invalidate_cache(bs->file->bs, &local_err); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3298 | } |
| 3299 | if (local_err) { |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 3300 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3301 | error_propagate(errp, local_err); |
| 3302 | return; |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 3303 | } |
| 3304 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3305 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 3306 | if (ret < 0) { |
Kevin Wolf | 04c01a5 | 2016-01-13 15:56:06 +0100 | [diff] [blame] | 3307 | bs->open_flags |= BDRV_O_INACTIVE; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3308 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 3309 | return; |
| 3310 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3311 | } |
| 3312 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3313 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3314 | { |
| 3315 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3316 | Error *local_err = NULL; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3317 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3318 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3319 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 3320 | |
| 3321 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3322 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3323 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 3324 | if (local_err) { |
| 3325 | error_propagate(errp, local_err); |
| 3326 | return; |
| 3327 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 3328 | } |
| 3329 | } |
| 3330 | |
Kevin Wolf | 76b1c7f | 2015-12-22 14:07:08 +0100 | [diff] [blame] | 3331 | static int bdrv_inactivate(BlockDriverState *bs) |
| 3332 | { |
| 3333 | int ret; |
| 3334 | |
| 3335 | if (bs->drv->bdrv_inactivate) { |
| 3336 | ret = bs->drv->bdrv_inactivate(bs); |
| 3337 | if (ret < 0) { |
| 3338 | return ret; |
| 3339 | } |
| 3340 | } |
| 3341 | |
| 3342 | bs->open_flags |= BDRV_O_INACTIVE; |
| 3343 | return 0; |
| 3344 | } |
| 3345 | |
| 3346 | int bdrv_inactivate_all(void) |
| 3347 | { |
| 3348 | BlockDriverState *bs; |
| 3349 | int ret; |
| 3350 | |
| 3351 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 3352 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 3353 | |
| 3354 | aio_context_acquire(aio_context); |
| 3355 | ret = bdrv_inactivate(bs); |
| 3356 | aio_context_release(aio_context); |
| 3357 | if (ret < 0) { |
| 3358 | return ret; |
| 3359 | } |
| 3360 | } |
| 3361 | |
| 3362 | return 0; |
| 3363 | } |
| 3364 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 3365 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3366 | /* removable device support */ |
| 3367 | |
| 3368 | /** |
| 3369 | * Return TRUE if the media is present |
| 3370 | */ |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 3371 | bool bdrv_is_inserted(BlockDriverState *bs) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3372 | { |
| 3373 | BlockDriver *drv = bs->drv; |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 3374 | BdrvChild *child; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 3375 | |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 3376 | if (!drv) { |
| 3377 | return false; |
| 3378 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 3379 | if (drv->bdrv_is_inserted) { |
| 3380 | return drv->bdrv_is_inserted(bs); |
Max Reitz | e031f75 | 2015-10-19 17:53:11 +0200 | [diff] [blame] | 3381 | } |
Max Reitz | 28d7a78 | 2015-10-19 17:53:13 +0200 | [diff] [blame] | 3382 | QLIST_FOREACH(child, &bs->children, next) { |
| 3383 | if (!bdrv_is_inserted(child->bs)) { |
| 3384 | return false; |
| 3385 | } |
| 3386 | } |
| 3387 | return true; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3388 | } |
| 3389 | |
| 3390 | /** |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 3391 | * Return whether the media changed since the last call to this |
| 3392 | * function, or -ENOTSUP if we don't know. Most drivers don't know. |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3393 | */ |
| 3394 | int bdrv_media_changed(BlockDriverState *bs) |
| 3395 | { |
| 3396 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3397 | |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 3398 | if (drv && drv->bdrv_media_changed) { |
| 3399 | return drv->bdrv_media_changed(bs); |
| 3400 | } |
| 3401 | return -ENOTSUP; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3402 | } |
| 3403 | |
| 3404 | /** |
| 3405 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 3406 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 3407 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3408 | { |
| 3409 | BlockDriver *drv = bs->drv; |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3410 | const char *device_name; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3411 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 3412 | if (drv && drv->bdrv_eject) { |
| 3413 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3414 | } |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 3415 | |
Markus Armbruster | bfb197e | 2014-10-07 13:59:11 +0200 | [diff] [blame] | 3416 | device_name = bdrv_get_device_name(bs); |
| 3417 | if (device_name[0] != '\0') { |
| 3418 | qapi_event_send_device_tray_moved(device_name, |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 3419 | eject_flag, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 3420 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3421 | } |
| 3422 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3423 | /** |
| 3424 | * Lock or unlock the media (if it is locked, the user won't be able |
| 3425 | * to eject it manually). |
| 3426 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3427 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3428 | { |
| 3429 | BlockDriver *drv = bs->drv; |
| 3430 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3431 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 3432 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 3433 | if (drv && drv->bdrv_lock_medium) { |
| 3434 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3435 | } |
| 3436 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 3437 | |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3438 | BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) |
| 3439 | { |
| 3440 | BdrvDirtyBitmap *bm; |
| 3441 | |
| 3442 | assert(name); |
| 3443 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
| 3444 | if (bm->name && !strcmp(name, bm->name)) { |
| 3445 | return bm; |
| 3446 | } |
| 3447 | } |
| 3448 | return NULL; |
| 3449 | } |
| 3450 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3451 | void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3452 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3453 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3454 | g_free(bitmap->name); |
| 3455 | bitmap->name = NULL; |
| 3456 | } |
| 3457 | |
| 3458 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3459 | uint32_t granularity, |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3460 | const char *name, |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 3461 | Error **errp) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3462 | { |
| 3463 | int64_t bitmap_size; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3464 | BdrvDirtyBitmap *bitmap; |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3465 | uint32_t sector_granularity; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 3466 | |
Paolo Bonzini | 50717e9 | 2013-01-21 17:09:45 +0100 | [diff] [blame] | 3467 | assert((granularity & (granularity - 1)) == 0); |
| 3468 | |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3469 | if (name && bdrv_find_dirty_bitmap(bs, name)) { |
| 3470 | error_setg(errp, "Bitmap already exists: %s", name); |
| 3471 | return NULL; |
| 3472 | } |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3473 | sector_granularity = granularity >> BDRV_SECTOR_BITS; |
| 3474 | assert(sector_granularity); |
Markus Armbruster | 57322b7 | 2014-06-26 13:23:22 +0200 | [diff] [blame] | 3475 | bitmap_size = bdrv_nb_sectors(bs); |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 3476 | if (bitmap_size < 0) { |
| 3477 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); |
| 3478 | errno = -bitmap_size; |
| 3479 | return NULL; |
| 3480 | } |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3481 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
John Snow | 5fba6c0 | 2015-04-17 19:49:51 -0400 | [diff] [blame] | 3482 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity)); |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3483 | bitmap->size = bitmap_size; |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3484 | bitmap->name = g_strdup(name); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3485 | bitmap->disabled = false; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3486 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); |
| 3487 | return bitmap; |
| 3488 | } |
| 3489 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3490 | bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) |
| 3491 | { |
| 3492 | return bitmap->successor; |
| 3493 | } |
| 3494 | |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3495 | bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) |
| 3496 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3497 | return !(bitmap->disabled || bitmap->successor); |
| 3498 | } |
| 3499 | |
John Snow | 9abe3bd | 2015-05-12 15:53:01 -0400 | [diff] [blame] | 3500 | DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap) |
| 3501 | { |
| 3502 | if (bdrv_dirty_bitmap_frozen(bitmap)) { |
| 3503 | return DIRTY_BITMAP_STATUS_FROZEN; |
| 3504 | } else if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
| 3505 | return DIRTY_BITMAP_STATUS_DISABLED; |
| 3506 | } else { |
| 3507 | return DIRTY_BITMAP_STATUS_ACTIVE; |
| 3508 | } |
| 3509 | } |
| 3510 | |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3511 | /** |
| 3512 | * Create a successor bitmap destined to replace this bitmap after an operation. |
| 3513 | * Requires that the bitmap is not frozen and has no successor. |
| 3514 | */ |
| 3515 | int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, |
| 3516 | BdrvDirtyBitmap *bitmap, Error **errp) |
| 3517 | { |
| 3518 | uint64_t granularity; |
| 3519 | BdrvDirtyBitmap *child; |
| 3520 | |
| 3521 | if (bdrv_dirty_bitmap_frozen(bitmap)) { |
| 3522 | error_setg(errp, "Cannot create a successor for a bitmap that is " |
| 3523 | "currently frozen"); |
| 3524 | return -1; |
| 3525 | } |
| 3526 | assert(!bitmap->successor); |
| 3527 | |
| 3528 | /* Create an anonymous successor */ |
| 3529 | granularity = bdrv_dirty_bitmap_granularity(bitmap); |
| 3530 | child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); |
| 3531 | if (!child) { |
| 3532 | return -1; |
| 3533 | } |
| 3534 | |
| 3535 | /* Successor will be on or off based on our current state. */ |
| 3536 | child->disabled = bitmap->disabled; |
| 3537 | |
| 3538 | /* Install the successor and freeze the parent */ |
| 3539 | bitmap->successor = child; |
| 3540 | return 0; |
| 3541 | } |
| 3542 | |
| 3543 | /** |
| 3544 | * For a bitmap with a successor, yield our name to the successor, |
| 3545 | * delete the old bitmap, and return a handle to the new bitmap. |
| 3546 | */ |
| 3547 | BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, |
| 3548 | BdrvDirtyBitmap *bitmap, |
| 3549 | Error **errp) |
| 3550 | { |
| 3551 | char *name; |
| 3552 | BdrvDirtyBitmap *successor = bitmap->successor; |
| 3553 | |
| 3554 | if (successor == NULL) { |
| 3555 | error_setg(errp, "Cannot relinquish control if " |
| 3556 | "there's no successor present"); |
| 3557 | return NULL; |
| 3558 | } |
| 3559 | |
| 3560 | name = bitmap->name; |
| 3561 | bitmap->name = NULL; |
| 3562 | successor->name = name; |
| 3563 | bitmap->successor = NULL; |
| 3564 | bdrv_release_dirty_bitmap(bs, bitmap); |
| 3565 | |
| 3566 | return successor; |
| 3567 | } |
| 3568 | |
| 3569 | /** |
| 3570 | * In cases of failure where we can no longer safely delete the parent, |
| 3571 | * we may wish to re-join the parent and child/successor. |
| 3572 | * The merged parent will be un-frozen, but not explicitly re-enabled. |
| 3573 | */ |
| 3574 | BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, |
| 3575 | BdrvDirtyBitmap *parent, |
| 3576 | Error **errp) |
| 3577 | { |
| 3578 | BdrvDirtyBitmap *successor = parent->successor; |
| 3579 | |
| 3580 | if (!successor) { |
| 3581 | error_setg(errp, "Cannot reclaim a successor when none is present"); |
| 3582 | return NULL; |
| 3583 | } |
| 3584 | |
| 3585 | if (!hbitmap_merge(parent->bitmap, successor->bitmap)) { |
| 3586 | error_setg(errp, "Merging of parent and successor bitmap failed"); |
| 3587 | return NULL; |
| 3588 | } |
| 3589 | bdrv_release_dirty_bitmap(bs, successor); |
| 3590 | parent->successor = NULL; |
| 3591 | |
| 3592 | return parent; |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3593 | } |
| 3594 | |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3595 | /** |
| 3596 | * Truncates _all_ bitmaps attached to a BDS. |
| 3597 | */ |
| 3598 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) |
| 3599 | { |
| 3600 | BdrvDirtyBitmap *bitmap; |
| 3601 | uint64_t size = bdrv_nb_sectors(bs); |
| 3602 | |
| 3603 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
John Snow | 06207b0 | 2015-06-10 13:24:54 -0400 | [diff] [blame] | 3604 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3605 | hbitmap_truncate(bitmap->bitmap, size); |
John Snow | 5270b6a | 2015-06-08 16:49:15 -0400 | [diff] [blame] | 3606 | bitmap->size = size; |
John Snow | ce1ffea | 2015-04-17 19:50:03 -0400 | [diff] [blame] | 3607 | } |
| 3608 | } |
| 3609 | |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 3610 | static void bdrv_do_release_matching_dirty_bitmap(BlockDriverState *bs, |
| 3611 | BdrvDirtyBitmap *bitmap, |
| 3612 | bool only_named) |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3613 | { |
| 3614 | BdrvDirtyBitmap *bm, *next; |
| 3615 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 3616 | if ((!bitmap || bm == bitmap) && (!only_named || bm->name)) { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3617 | assert(!bdrv_dirty_bitmap_frozen(bm)); |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 3618 | QLIST_REMOVE(bm, list); |
| 3619 | hbitmap_free(bm->bitmap); |
| 3620 | g_free(bm->name); |
| 3621 | g_free(bm); |
| 3622 | |
| 3623 | if (bitmap) { |
| 3624 | return; |
| 3625 | } |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 3626 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3627 | } |
| 3628 | } |
| 3629 | |
Max Reitz | c5acdc9 | 2016-01-29 16:36:01 +0100 | [diff] [blame] | 3630 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 3631 | { |
| 3632 | bdrv_do_release_matching_dirty_bitmap(bs, bitmap, false); |
| 3633 | } |
| 3634 | |
| 3635 | /** |
| 3636 | * Release all named dirty bitmaps attached to a BDS (for use in bdrv_close()). |
| 3637 | * There must not be any frozen bitmaps attached. |
| 3638 | */ |
| 3639 | static void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs) |
| 3640 | { |
| 3641 | bdrv_do_release_matching_dirty_bitmap(bs, NULL, true); |
| 3642 | } |
| 3643 | |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3644 | void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
| 3645 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3646 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3647 | bitmap->disabled = true; |
| 3648 | } |
| 3649 | |
| 3650 | void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
| 3651 | { |
John Snow | 9bd2b08 | 2015-04-17 19:49:57 -0400 | [diff] [blame] | 3652 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3653 | bitmap->disabled = false; |
| 3654 | } |
| 3655 | |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 3656 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
| 3657 | { |
| 3658 | BdrvDirtyBitmap *bm; |
| 3659 | BlockDirtyInfoList *list = NULL; |
| 3660 | BlockDirtyInfoList **plist = &list; |
| 3661 | |
| 3662 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3663 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
| 3664 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3665 | info->count = bdrv_get_dirty_count(bm); |
John Snow | 592fdd0 | 2015-04-17 19:49:53 -0400 | [diff] [blame] | 3666 | info->granularity = bdrv_dirty_bitmap_granularity(bm); |
Fam Zheng | 0db6e54 | 2015-04-17 19:49:50 -0400 | [diff] [blame] | 3667 | info->has_name = !!bm->name; |
| 3668 | info->name = g_strdup(bm->name); |
John Snow | 9abe3bd | 2015-05-12 15:53:01 -0400 | [diff] [blame] | 3669 | info->status = bdrv_dirty_bitmap_status(bm); |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 3670 | entry->value = info; |
| 3671 | *plist = entry; |
| 3672 | plist = &entry->next; |
| 3673 | } |
| 3674 | |
| 3675 | return list; |
| 3676 | } |
| 3677 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3678 | 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] | 3679 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3680 | if (bitmap) { |
| 3681 | return hbitmap_get(bitmap->bitmap, sector); |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 3682 | } else { |
| 3683 | return 0; |
| 3684 | } |
| 3685 | } |
| 3686 | |
John Snow | 341ebc2 | 2015-04-17 19:49:52 -0400 | [diff] [blame] | 3687 | /** |
| 3688 | * Chooses a default granularity based on the existing cluster size, |
| 3689 | * but clamped between [4K, 64K]. Defaults to 64K in the case that there |
| 3690 | * is no cluster size information available. |
| 3691 | */ |
| 3692 | uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) |
| 3693 | { |
| 3694 | BlockDriverInfo bdi; |
| 3695 | uint32_t granularity; |
| 3696 | |
| 3697 | if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) { |
| 3698 | granularity = MAX(4096, bdi.cluster_size); |
| 3699 | granularity = MIN(65536, granularity); |
| 3700 | } else { |
| 3701 | granularity = 65536; |
| 3702 | } |
| 3703 | |
| 3704 | return granularity; |
| 3705 | } |
| 3706 | |
John Snow | 592fdd0 | 2015-04-17 19:49:53 -0400 | [diff] [blame] | 3707 | uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) |
| 3708 | { |
| 3709 | return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); |
| 3710 | } |
| 3711 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3712 | void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3713 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3714 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3715 | } |
| 3716 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3717 | void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3718 | int64_t cur_sector, int nr_sectors) |
| 3719 | { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3720 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3721 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
| 3722 | } |
| 3723 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3724 | void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3725 | int64_t cur_sector, int nr_sectors) |
| 3726 | { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3727 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Vladimir Sementsov-Ogievskiy | c4237df | 2014-11-27 12:40:46 +0300 | [diff] [blame] | 3728 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
| 3729 | } |
| 3730 | |
Fam Zheng | df9a681 | 2015-11-09 18:16:54 +0800 | [diff] [blame] | 3731 | void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out) |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3732 | { |
| 3733 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
Fam Zheng | df9a681 | 2015-11-09 18:16:54 +0800 | [diff] [blame] | 3734 | if (!out) { |
| 3735 | hbitmap_reset_all(bitmap->bitmap); |
| 3736 | } else { |
| 3737 | HBitmap *backup = bitmap->bitmap; |
| 3738 | bitmap->bitmap = hbitmap_alloc(bitmap->size, |
| 3739 | hbitmap_granularity(backup)); |
| 3740 | *out = backup; |
| 3741 | } |
| 3742 | } |
| 3743 | |
| 3744 | void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in) |
| 3745 | { |
| 3746 | HBitmap *tmp = bitmap->bitmap; |
| 3747 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
| 3748 | bitmap->bitmap = in; |
| 3749 | hbitmap_free(tmp); |
John Snow | e74e6b7 | 2015-04-17 19:49:59 -0400 | [diff] [blame] | 3750 | } |
| 3751 | |
Stefan Hajnoczi | e0c47b6 | 2015-04-28 14:27:50 +0100 | [diff] [blame] | 3752 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
| 3753 | int nr_sectors) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 3754 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3755 | BdrvDirtyBitmap *bitmap; |
| 3756 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
John Snow | b8e6fb7 | 2015-04-17 19:49:56 -0400 | [diff] [blame] | 3757 | if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
| 3758 | continue; |
| 3759 | } |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3760 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
Paolo Bonzini | 8f0720e | 2013-01-21 17:09:41 +0100 | [diff] [blame] | 3761 | } |
Liran Schour | aaa0eb7 | 2010-01-26 10:31:48 +0200 | [diff] [blame] | 3762 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3763 | |
John Snow | d58d845 | 2015-04-17 19:49:58 -0400 | [diff] [blame] | 3764 | /** |
| 3765 | * Advance an HBitmapIter to an arbitrary offset. |
| 3766 | */ |
| 3767 | void bdrv_set_dirty_iter(HBitmapIter *hbi, int64_t offset) |
| 3768 | { |
| 3769 | assert(hbi->hb); |
| 3770 | hbitmap_iter_init(hbi, hbi->hb, offset); |
| 3771 | } |
| 3772 | |
John Snow | 20dca81 | 2015-04-17 19:50:02 -0400 | [diff] [blame] | 3773 | int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3774 | { |
| 3775 | return hbitmap_count(bitmap->bitmap); |
| 3776 | } |
| 3777 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 3778 | /* Get a reference to bs */ |
| 3779 | void bdrv_ref(BlockDriverState *bs) |
| 3780 | { |
| 3781 | bs->refcnt++; |
| 3782 | } |
| 3783 | |
| 3784 | /* Release a previously grabbed reference to bs. |
| 3785 | * If after releasing, reference count is zero, the BlockDriverState is |
| 3786 | * deleted. */ |
| 3787 | void bdrv_unref(BlockDriverState *bs) |
| 3788 | { |
Jeff Cody | 9a4d5ca | 2014-07-23 17:22:57 -0400 | [diff] [blame] | 3789 | if (!bs) { |
| 3790 | return; |
| 3791 | } |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 3792 | assert(bs->refcnt > 0); |
| 3793 | if (--bs->refcnt == 0) { |
| 3794 | bdrv_delete(bs); |
| 3795 | } |
| 3796 | } |
| 3797 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3798 | struct BdrvOpBlocker { |
| 3799 | Error *reason; |
| 3800 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 3801 | }; |
| 3802 | |
| 3803 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 3804 | { |
| 3805 | BdrvOpBlocker *blocker; |
| 3806 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3807 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 3808 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
| 3809 | if (errp) { |
Markus Armbruster | e43bfd9 | 2015-12-18 16:35:15 +0100 | [diff] [blame] | 3810 | *errp = error_copy(blocker->reason); |
| 3811 | error_prepend(errp, "Node '%s' is busy: ", |
| 3812 | bdrv_get_device_or_node_name(bs)); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3813 | } |
| 3814 | return true; |
| 3815 | } |
| 3816 | return false; |
| 3817 | } |
| 3818 | |
| 3819 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 3820 | { |
| 3821 | BdrvOpBlocker *blocker; |
| 3822 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3823 | |
Markus Armbruster | 5839e53 | 2014-08-19 10:31:08 +0200 | [diff] [blame] | 3824 | blocker = g_new0(BdrvOpBlocker, 1); |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 3825 | blocker->reason = reason; |
| 3826 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 3827 | } |
| 3828 | |
| 3829 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 3830 | { |
| 3831 | BdrvOpBlocker *blocker, *next; |
| 3832 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 3833 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 3834 | if (blocker->reason == reason) { |
| 3835 | QLIST_REMOVE(blocker, list); |
| 3836 | g_free(blocker); |
| 3837 | } |
| 3838 | } |
| 3839 | } |
| 3840 | |
| 3841 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 3842 | { |
| 3843 | int i; |
| 3844 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3845 | bdrv_op_block(bs, i, reason); |
| 3846 | } |
| 3847 | } |
| 3848 | |
| 3849 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 3850 | { |
| 3851 | int i; |
| 3852 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3853 | bdrv_op_unblock(bs, i, reason); |
| 3854 | } |
| 3855 | } |
| 3856 | |
| 3857 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 3858 | { |
| 3859 | int i; |
| 3860 | |
| 3861 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 3862 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 3863 | return false; |
| 3864 | } |
| 3865 | } |
| 3866 | return true; |
| 3867 | } |
| 3868 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3869 | void bdrv_img_create(const char *filename, const char *fmt, |
| 3870 | const char *base_filename, const char *base_fmt, |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 3871 | char *options, uint64_t img_size, int flags, |
| 3872 | Error **errp, bool quiet) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3873 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3874 | QemuOptsList *create_opts = NULL; |
| 3875 | QemuOpts *opts = NULL; |
| 3876 | const char *backing_fmt, *backing_file; |
| 3877 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3878 | BlockDriver *drv, *proto_drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 3879 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3880 | int ret = 0; |
| 3881 | |
| 3882 | /* Find driver and parse its options */ |
| 3883 | drv = bdrv_find_format(fmt); |
| 3884 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3885 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3886 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3887 | } |
| 3888 | |
Max Reitz | b65a5e1 | 2015-02-05 13:58:12 -0500 | [diff] [blame] | 3889 | proto_drv = bdrv_find_protocol(filename, true, errp); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3890 | if (!proto_drv) { |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 3891 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3892 | } |
| 3893 | |
Max Reitz | c614972 | 2014-12-02 18:32:45 +0100 | [diff] [blame] | 3894 | if (!drv->create_opts) { |
| 3895 | error_setg(errp, "Format driver '%s' does not support image creation", |
| 3896 | drv->format_name); |
| 3897 | return; |
| 3898 | } |
| 3899 | |
| 3900 | if (!proto_drv->create_opts) { |
| 3901 | error_setg(errp, "Protocol driver '%s' does not support image creation", |
| 3902 | proto_drv->format_name); |
| 3903 | return; |
| 3904 | } |
| 3905 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 3906 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 3907 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3908 | |
| 3909 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3910 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3911 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3912 | |
| 3913 | /* Parse -o options */ |
| 3914 | if (options) { |
Markus Armbruster | dc523cd34 | 2015-02-12 18:37:11 +0100 | [diff] [blame] | 3915 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
| 3916 | if (local_err) { |
| 3917 | error_report_err(local_err); |
| 3918 | local_err = NULL; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3919 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3920 | goto out; |
| 3921 | } |
| 3922 | } |
| 3923 | |
| 3924 | if (base_filename) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 3925 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 3926 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3927 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 3928 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3929 | goto out; |
| 3930 | } |
| 3931 | } |
| 3932 | |
| 3933 | if (base_fmt) { |
Markus Armbruster | f43e47d | 2015-02-12 17:52:20 +0100 | [diff] [blame] | 3934 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
Markus Armbruster | 6be4194 | 2015-02-12 17:49:02 +0100 | [diff] [blame] | 3935 | if (local_err) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3936 | error_setg(errp, "Backing file format not supported for file " |
| 3937 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3938 | goto out; |
| 3939 | } |
| 3940 | } |
| 3941 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3942 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 3943 | if (backing_file) { |
| 3944 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 3945 | error_setg(errp, "Error: Trying to create an image with the " |
| 3946 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 3947 | goto out; |
| 3948 | } |
| 3949 | } |
| 3950 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 3951 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3952 | |
| 3953 | // The size for the image must always be specified, with one exception: |
| 3954 | // 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] | 3955 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
| 3956 | if (size == -1) { |
| 3957 | if (backing_file) { |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 3958 | BlockDriverState *bs; |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3959 | char *full_backing = g_new0(char, PATH_MAX); |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 3960 | int64_t size; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 3961 | int back_flags; |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 3962 | QDict *backing_options = NULL; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 3963 | |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3964 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
| 3965 | full_backing, PATH_MAX, |
| 3966 | &local_err); |
| 3967 | if (local_err) { |
| 3968 | g_free(full_backing); |
| 3969 | goto out; |
| 3970 | } |
| 3971 | |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 3972 | /* backing files always opened read-only */ |
| 3973 | back_flags = |
| 3974 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3975 | |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 3976 | if (backing_fmt) { |
| 3977 | backing_options = qdict_new(); |
| 3978 | qdict_put(backing_options, "driver", |
| 3979 | qstring_from_str(backing_fmt)); |
| 3980 | } |
| 3981 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 3982 | bs = NULL; |
Max Reitz | e664171 | 2015-08-26 19:47:48 +0200 | [diff] [blame] | 3983 | ret = bdrv_open(&bs, full_backing, NULL, backing_options, |
Max Reitz | 6ebf9aa | 2015-08-26 19:47:49 +0200 | [diff] [blame] | 3984 | back_flags, &local_err); |
Max Reitz | 2916801 | 2014-11-26 17:20:27 +0100 | [diff] [blame] | 3985 | g_free(full_backing); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3986 | if (ret < 0) { |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3987 | goto out; |
| 3988 | } |
Markus Armbruster | 52bf1e7 | 2014-06-26 13:23:25 +0200 | [diff] [blame] | 3989 | size = bdrv_getlength(bs); |
| 3990 | if (size < 0) { |
| 3991 | error_setg_errno(errp, -size, "Could not get size of '%s'", |
| 3992 | backing_file); |
| 3993 | bdrv_unref(bs); |
| 3994 | goto out; |
| 3995 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 3996 | |
Markus Armbruster | 39101f2 | 2015-02-12 16:46:36 +0100 | [diff] [blame] | 3997 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 3998 | |
| 3999 | bdrv_unref(bs); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4000 | } else { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 4001 | error_setg(errp, "Image creation needs a size parameter"); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4002 | goto out; |
| 4003 | } |
| 4004 | } |
| 4005 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 4006 | if (!quiet) { |
Kővágó, Zoltán | fe64669 | 2015-07-07 16:42:10 +0200 | [diff] [blame] | 4007 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Fam Zheng | 43c5d8f | 2014-12-09 15:38:04 +0800 | [diff] [blame] | 4008 | qemu_opts_print(opts, " "); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 4009 | puts(""); |
| 4010 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4011 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 4012 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4013 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4014 | if (ret == -EFBIG) { |
| 4015 | /* This is generally a better message than whatever the driver would |
| 4016 | * deliver (especially because of the cluster_size_hint), since that |
| 4017 | * is most probably not much different from "image too large". */ |
| 4018 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4019 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4020 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4021 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4022 | error_setg(errp, "The image size is too large for file format '%s'" |
| 4023 | "%s", fmt, cluster_size_hint); |
| 4024 | error_free(local_err); |
| 4025 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4026 | } |
| 4027 | |
| 4028 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 4029 | qemu_opts_del(opts); |
| 4030 | qemu_opts_free(create_opts); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 4031 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 4032 | error_propagate(errp, local_err); |
| 4033 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 4034 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 4035 | |
| 4036 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 4037 | { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4038 | return bs->aio_context; |
| 4039 | } |
| 4040 | |
| 4041 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 4042 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4043 | BdrvAioNotifier *baf; |
| 4044 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4045 | if (!bs->drv) { |
| 4046 | return; |
| 4047 | } |
| 4048 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4049 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
| 4050 | baf->detach_aio_context(baf->opaque); |
| 4051 | } |
| 4052 | |
Alberto Garcia | a0d64a6 | 2015-11-04 15:15:36 +0200 | [diff] [blame] | 4053 | if (bs->throttle_state) { |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 4054 | throttle_timers_detach_aio_context(&bs->throttle_timers); |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 4055 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4056 | if (bs->drv->bdrv_detach_aio_context) { |
| 4057 | bs->drv->bdrv_detach_aio_context(bs); |
| 4058 | } |
| 4059 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4060 | bdrv_detach_aio_context(bs->file->bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4061 | } |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4062 | if (bs->backing) { |
| 4063 | bdrv_detach_aio_context(bs->backing->bs); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4064 | } |
| 4065 | |
| 4066 | bs->aio_context = NULL; |
| 4067 | } |
| 4068 | |
| 4069 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 4070 | AioContext *new_context) |
| 4071 | { |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4072 | BdrvAioNotifier *ban; |
| 4073 | |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4074 | if (!bs->drv) { |
| 4075 | return; |
| 4076 | } |
| 4077 | |
| 4078 | bs->aio_context = new_context; |
| 4079 | |
Kevin Wolf | 760e006 | 2015-06-17 14:55:21 +0200 | [diff] [blame] | 4080 | if (bs->backing) { |
| 4081 | bdrv_attach_aio_context(bs->backing->bs, new_context); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4082 | } |
| 4083 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4084 | bdrv_attach_aio_context(bs->file->bs, new_context); |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4085 | } |
| 4086 | if (bs->drv->bdrv_attach_aio_context) { |
| 4087 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 4088 | } |
Alberto Garcia | a0d64a6 | 2015-11-04 15:15:36 +0200 | [diff] [blame] | 4089 | if (bs->throttle_state) { |
Benoît Canet | 0e5b0a2 | 2015-06-08 18:17:41 +0200 | [diff] [blame] | 4090 | throttle_timers_attach_aio_context(&bs->throttle_timers, new_context); |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 4091 | } |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4092 | |
| 4093 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { |
| 4094 | ban->attached_aio_context(new_context, ban->opaque); |
| 4095 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4096 | } |
| 4097 | |
| 4098 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 4099 | { |
Fam Zheng | 53ec73e | 2015-05-29 18:53:14 +0800 | [diff] [blame] | 4100 | bdrv_drain(bs); /* ensure there are no in-flight requests */ |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 4101 | |
| 4102 | bdrv_detach_aio_context(bs); |
| 4103 | |
| 4104 | /* This function executes in the old AioContext so acquire the new one in |
| 4105 | * case it runs in a different thread. |
| 4106 | */ |
| 4107 | aio_context_acquire(new_context); |
| 4108 | bdrv_attach_aio_context(bs, new_context); |
| 4109 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 4110 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 4111 | |
Max Reitz | 3338442 | 2014-06-20 21:57:33 +0200 | [diff] [blame] | 4112 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
| 4113 | void (*attached_aio_context)(AioContext *new_context, void *opaque), |
| 4114 | void (*detach_aio_context)(void *opaque), void *opaque) |
| 4115 | { |
| 4116 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); |
| 4117 | *ban = (BdrvAioNotifier){ |
| 4118 | .attached_aio_context = attached_aio_context, |
| 4119 | .detach_aio_context = detach_aio_context, |
| 4120 | .opaque = opaque |
| 4121 | }; |
| 4122 | |
| 4123 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); |
| 4124 | } |
| 4125 | |
| 4126 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, |
| 4127 | void (*attached_aio_context)(AioContext *, |
| 4128 | void *), |
| 4129 | void (*detach_aio_context)(void *), |
| 4130 | void *opaque) |
| 4131 | { |
| 4132 | BdrvAioNotifier *ban, *ban_next; |
| 4133 | |
| 4134 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
| 4135 | if (ban->attached_aio_context == attached_aio_context && |
| 4136 | ban->detach_aio_context == detach_aio_context && |
| 4137 | ban->opaque == opaque) |
| 4138 | { |
| 4139 | QLIST_REMOVE(ban, list); |
| 4140 | g_free(ban); |
| 4141 | |
| 4142 | return; |
| 4143 | } |
| 4144 | } |
| 4145 | |
| 4146 | abort(); |
| 4147 | } |
| 4148 | |
Max Reitz | 7748543 | 2014-10-27 11:12:50 +0100 | [diff] [blame] | 4149 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
Max Reitz | 8b13976 | 2015-07-27 17:51:32 +0200 | [diff] [blame] | 4150 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4151 | { |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 4152 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4153 | return -ENOTSUP; |
| 4154 | } |
Max Reitz | 8b13976 | 2015-07-27 17:51:32 +0200 | [diff] [blame] | 4155 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, cb_opaque); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 4156 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4157 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4158 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 4159 | * of block filter and by bdrv_is_first_non_filter. |
| 4160 | * It is used to test if the given bs is the candidate or recurse more in the |
| 4161 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4162 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4163 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 4164 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4165 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4166 | /* return false if basic checks fails */ |
| 4167 | if (!bs || !bs->drv) { |
| 4168 | return false; |
| 4169 | } |
| 4170 | |
| 4171 | /* the code reached a non block filter driver -> check if the bs is |
| 4172 | * the same as the candidate. It's the recursion termination condition. |
| 4173 | */ |
| 4174 | if (!bs->drv->is_filter) { |
| 4175 | return bs == candidate; |
| 4176 | } |
| 4177 | /* Down this path the driver is a block filter driver */ |
| 4178 | |
| 4179 | /* If the block filter recursion method is defined use it to recurse down |
| 4180 | * the node graph. |
| 4181 | */ |
| 4182 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4183 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 4184 | } |
| 4185 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4186 | /* the driver is a block filter but don't allow to recurse -> return false |
| 4187 | */ |
| 4188 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4189 | } |
| 4190 | |
| 4191 | /* This function checks if the candidate is the first non filter bs down it's |
| 4192 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 4193 | * from the top. Some filters can choose not to pass down the recursion. |
| 4194 | */ |
| 4195 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 4196 | { |
| 4197 | BlockDriverState *bs; |
| 4198 | |
| 4199 | /* walk down the bs forest recursively */ |
| 4200 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 4201 | bool perm; |
| 4202 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 4203 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 4204 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 4205 | |
| 4206 | /* candidate is the first non filter */ |
| 4207 | if (perm) { |
| 4208 | return true; |
| 4209 | } |
| 4210 | } |
| 4211 | |
| 4212 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 4213 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4214 | |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 4215 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
| 4216 | const char *node_name, Error **errp) |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4217 | { |
| 4218 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4219 | AioContext *aio_context; |
| 4220 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4221 | if (!to_replace_bs) { |
| 4222 | error_setg(errp, "Node name '%s' not found", node_name); |
| 4223 | return NULL; |
| 4224 | } |
| 4225 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4226 | aio_context = bdrv_get_aio_context(to_replace_bs); |
| 4227 | aio_context_acquire(aio_context); |
| 4228 | |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4229 | 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] | 4230 | to_replace_bs = NULL; |
| 4231 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4232 | } |
| 4233 | |
| 4234 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 4235 | * most non filter in order to prevent data corruption. |
| 4236 | * Another benefit is that this tests exclude backing files which are |
| 4237 | * blocked by the backing blockers. |
| 4238 | */ |
Wen Congyang | e12f378 | 2015-07-17 10:12:22 +0800 | [diff] [blame] | 4239 | if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4240 | error_setg(errp, "Only top most non filter can be replaced"); |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4241 | to_replace_bs = NULL; |
| 4242 | goto out; |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4243 | } |
| 4244 | |
Stefan Hajnoczi | 5a7e7a0 | 2014-10-21 12:03:58 +0100 | [diff] [blame] | 4245 | out: |
| 4246 | aio_context_release(aio_context); |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 4247 | return to_replace_bs; |
| 4248 | } |
Ming Lei | 448ad91 | 2014-07-04 18:04:33 +0800 | [diff] [blame] | 4249 | |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4250 | static bool append_open_options(QDict *d, BlockDriverState *bs) |
| 4251 | { |
| 4252 | const QDictEntry *entry; |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 4253 | QemuOptDesc *desc; |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 4254 | BdrvChild *child; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4255 | bool found_any = false; |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 4256 | const char *p; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4257 | |
| 4258 | for (entry = qdict_first(bs->options); entry; |
| 4259 | entry = qdict_next(bs->options, entry)) |
| 4260 | { |
Kevin Wolf | 260fecf | 2015-04-27 13:46:22 +0200 | [diff] [blame] | 4261 | /* Exclude options for children */ |
| 4262 | QLIST_FOREACH(child, &bs->children, next) { |
| 4263 | if (strstart(qdict_entry_key(entry), child->name, &p) |
| 4264 | && (!*p || *p == '.')) |
| 4265 | { |
| 4266 | break; |
| 4267 | } |
| 4268 | } |
| 4269 | if (child) { |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 4270 | continue; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4271 | } |
Kevin Wolf | 9e700c1 | 2015-04-24 15:20:28 +0200 | [diff] [blame] | 4272 | |
| 4273 | /* And exclude all non-driver-specific options */ |
| 4274 | for (desc = bdrv_runtime_opts.desc; desc->name; desc++) { |
| 4275 | if (!strcmp(qdict_entry_key(entry), desc->name)) { |
| 4276 | break; |
| 4277 | } |
| 4278 | } |
| 4279 | if (desc->name) { |
| 4280 | continue; |
| 4281 | } |
| 4282 | |
| 4283 | qobject_incref(qdict_entry_value(entry)); |
| 4284 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); |
| 4285 | found_any = true; |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4286 | } |
| 4287 | |
| 4288 | return found_any; |
| 4289 | } |
| 4290 | |
| 4291 | /* Updates the following BDS fields: |
| 4292 | * - exact_filename: A filename which may be used for opening a block device |
| 4293 | * which (mostly) equals the given BDS (even without any |
| 4294 | * other options; so reading and writing must return the same |
| 4295 | * results, but caching etc. may be different) |
| 4296 | * - full_open_options: Options which, when given when opening a block device |
| 4297 | * (without a filename), result in a BDS (mostly) |
| 4298 | * equalling the given one |
| 4299 | * - filename: If exact_filename is set, it is copied here. Otherwise, |
| 4300 | * full_open_options is converted to a JSON object, prefixed with |
| 4301 | * "json:" (for use through the JSON pseudo protocol) and put here. |
| 4302 | */ |
| 4303 | void bdrv_refresh_filename(BlockDriverState *bs) |
| 4304 | { |
| 4305 | BlockDriver *drv = bs->drv; |
| 4306 | QDict *opts; |
| 4307 | |
| 4308 | if (!drv) { |
| 4309 | return; |
| 4310 | } |
| 4311 | |
| 4312 | /* This BDS's file name will most probably depend on its file's name, so |
| 4313 | * refresh that first */ |
| 4314 | if (bs->file) { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4315 | bdrv_refresh_filename(bs->file->bs); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4316 | } |
| 4317 | |
| 4318 | if (drv->bdrv_refresh_filename) { |
| 4319 | /* Obsolete information is of no use here, so drop the old file name |
| 4320 | * information before refreshing it */ |
| 4321 | bs->exact_filename[0] = '\0'; |
| 4322 | if (bs->full_open_options) { |
| 4323 | QDECREF(bs->full_open_options); |
| 4324 | bs->full_open_options = NULL; |
| 4325 | } |
| 4326 | |
Kevin Wolf | 4cdd01d | 2015-04-27 13:50:54 +0200 | [diff] [blame] | 4327 | opts = qdict_new(); |
| 4328 | append_open_options(opts, bs); |
| 4329 | drv->bdrv_refresh_filename(bs, opts); |
| 4330 | QDECREF(opts); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4331 | } else if (bs->file) { |
| 4332 | /* Try to reconstruct valid information from the underlying file */ |
| 4333 | bool has_open_options; |
| 4334 | |
| 4335 | bs->exact_filename[0] = '\0'; |
| 4336 | if (bs->full_open_options) { |
| 4337 | QDECREF(bs->full_open_options); |
| 4338 | bs->full_open_options = NULL; |
| 4339 | } |
| 4340 | |
| 4341 | opts = qdict_new(); |
| 4342 | has_open_options = append_open_options(opts, bs); |
| 4343 | |
| 4344 | /* If no specific options have been given for this BDS, the filename of |
| 4345 | * the underlying file should suffice for this one as well */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4346 | if (bs->file->bs->exact_filename[0] && !has_open_options) { |
| 4347 | strcpy(bs->exact_filename, bs->file->bs->exact_filename); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4348 | } |
| 4349 | /* Reconstructing the full options QDict is simple for most format block |
| 4350 | * drivers, as long as the full options are known for the underlying |
| 4351 | * file BDS. The full options QDict of that file BDS should somehow |
| 4352 | * contain a representation of the filename, therefore the following |
| 4353 | * suffices without querying the (exact_)filename of this BDS. */ |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4354 | if (bs->file->bs->full_open_options) { |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4355 | qdict_put_obj(opts, "driver", |
| 4356 | QOBJECT(qstring_from_str(drv->format_name))); |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 4357 | QINCREF(bs->file->bs->full_open_options); |
| 4358 | qdict_put_obj(opts, "file", |
| 4359 | QOBJECT(bs->file->bs->full_open_options)); |
Max Reitz | 91af701 | 2014-07-18 20:24:56 +0200 | [diff] [blame] | 4360 | |
| 4361 | bs->full_open_options = opts; |
| 4362 | } else { |
| 4363 | QDECREF(opts); |
| 4364 | } |
| 4365 | } else if (!bs->full_open_options && qdict_size(bs->options)) { |
| 4366 | /* There is no underlying file BDS (at least referenced by BDS.file), |
| 4367 | * so the full options QDict should be equal to the options given |
| 4368 | * specifically for this block device when it was opened (plus the |
| 4369 | * driver specification). |
| 4370 | * Because those options don't change, there is no need to update |
| 4371 | * full_open_options when it's already set. */ |
| 4372 | |
| 4373 | opts = qdict_new(); |
| 4374 | append_open_options(opts, bs); |
| 4375 | qdict_put_obj(opts, "driver", |
| 4376 | QOBJECT(qstring_from_str(drv->format_name))); |
| 4377 | |
| 4378 | if (bs->exact_filename[0]) { |
| 4379 | /* This may not work for all block protocol drivers (some may |
| 4380 | * require this filename to be parsed), but we have to find some |
| 4381 | * default solution here, so just include it. If some block driver |
| 4382 | * does not support pure options without any filename at all or |
| 4383 | * needs some special format of the options QDict, it needs to |
| 4384 | * implement the driver-specific bdrv_refresh_filename() function. |
| 4385 | */ |
| 4386 | qdict_put_obj(opts, "filename", |
| 4387 | QOBJECT(qstring_from_str(bs->exact_filename))); |
| 4388 | } |
| 4389 | |
| 4390 | bs->full_open_options = opts; |
| 4391 | } |
| 4392 | |
| 4393 | if (bs->exact_filename[0]) { |
| 4394 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); |
| 4395 | } else if (bs->full_open_options) { |
| 4396 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); |
| 4397 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", |
| 4398 | qstring_get_str(json)); |
| 4399 | QDECREF(json); |
| 4400 | } |
| 4401 | } |