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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
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 | */ | |
d38ea87a | 24 | #include "qemu/osdep.h" |
0ab8ed18 | 25 | #include "block/trace.h" |
737e150e PB |
26 | #include "block/block_int.h" |
27 | #include "block/blockjob.h" | |
cd7fca95 | 28 | #include "block/nbd.h" |
d49b6836 | 29 | #include "qemu/error-report.h" |
88d88798 | 30 | #include "module_block.h" |
1de7afc9 | 31 | #include "qemu/module.h" |
cc7a8ea7 | 32 | #include "qapi/qmp/qerror.h" |
91a097e7 | 33 | #include "qapi/qmp/qbool.h" |
7b1b5d19 | 34 | #include "qapi/qmp/qjson.h" |
bfb197e0 | 35 | #include "sysemu/block-backend.h" |
9c17d615 | 36 | #include "sysemu/sysemu.h" |
1de7afc9 | 37 | #include "qemu/notify.h" |
10817bf0 | 38 | #include "qemu/coroutine.h" |
c13163fb | 39 | #include "block/qapi.h" |
b2023818 | 40 | #include "qmp-commands.h" |
1de7afc9 | 41 | #include "qemu/timer.h" |
a5ee7bd4 | 42 | #include "qapi-event.h" |
f348b6d1 VB |
43 | #include "qemu/cutils.h" |
44 | #include "qemu/id.h" | |
692e01a2 | 45 | #include "qapi/util.h" |
fc01f7e7 | 46 | |
71e72a19 | 47 | #ifdef CONFIG_BSD |
7674e7bf | 48 | #include <sys/ioctl.h> |
72cf2d4f | 49 | #include <sys/queue.h> |
c5e97233 | 50 | #ifndef __DragonFly__ |
7674e7bf FB |
51 | #include <sys/disk.h> |
52 | #endif | |
c5e97233 | 53 | #endif |
7674e7bf | 54 | |
49dc768d AL |
55 | #ifdef _WIN32 |
56 | #include <windows.h> | |
57 | #endif | |
58 | ||
1c9805a3 SH |
59 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
60 | ||
dc364f4c BC |
61 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
62 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
63 | ||
2c1d04e0 HR |
64 | static QTAILQ_HEAD(, BlockDriverState) all_bdrv_states = |
65 | QTAILQ_HEAD_INITIALIZER(all_bdrv_states); | |
66 | ||
8a22f02a SH |
67 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
68 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 69 | |
5b363937 HR |
70 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
71 | const char *reference, | |
72 | QDict *options, int flags, | |
73 | BlockDriverState *parent, | |
74 | const BdrvChildRole *child_role, | |
75 | Error **errp); | |
f3930ed0 | 76 | |
eb852011 MA |
77 | /* If non-zero, use only whitelisted block drivers */ |
78 | static int use_bdrv_whitelist; | |
79 | ||
9e0b22f4 SH |
80 | #ifdef _WIN32 |
81 | static int is_windows_drive_prefix(const char *filename) | |
82 | { | |
83 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
84 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
85 | filename[1] == ':'); | |
86 | } | |
87 | ||
88 | int is_windows_drive(const char *filename) | |
89 | { | |
90 | if (is_windows_drive_prefix(filename) && | |
91 | filename[2] == '\0') | |
92 | return 1; | |
93 | if (strstart(filename, "\\\\.\\", NULL) || | |
94 | strstart(filename, "//./", NULL)) | |
95 | return 1; | |
96 | return 0; | |
97 | } | |
98 | #endif | |
99 | ||
339064d5 KW |
100 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
101 | { | |
102 | if (!bs || !bs->drv) { | |
459b4e66 DL |
103 | /* page size or 4k (hdd sector size) should be on the safe side */ |
104 | return MAX(4096, getpagesize()); | |
339064d5 KW |
105 | } |
106 | ||
107 | return bs->bl.opt_mem_alignment; | |
108 | } | |
109 | ||
4196d2f0 DL |
110 | size_t bdrv_min_mem_align(BlockDriverState *bs) |
111 | { | |
112 | if (!bs || !bs->drv) { | |
459b4e66 DL |
113 | /* page size or 4k (hdd sector size) should be on the safe side */ |
114 | return MAX(4096, getpagesize()); | |
4196d2f0 DL |
115 | } |
116 | ||
117 | return bs->bl.min_mem_alignment; | |
118 | } | |
119 | ||
9e0b22f4 | 120 | /* check if the path starts with "<protocol>:" */ |
5c98415b | 121 | int path_has_protocol(const char *path) |
9e0b22f4 | 122 | { |
947995c0 PB |
123 | const char *p; |
124 | ||
9e0b22f4 SH |
125 | #ifdef _WIN32 |
126 | if (is_windows_drive(path) || | |
127 | is_windows_drive_prefix(path)) { | |
128 | return 0; | |
129 | } | |
947995c0 PB |
130 | p = path + strcspn(path, ":/\\"); |
131 | #else | |
132 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
133 | #endif |
134 | ||
947995c0 | 135 | return *p == ':'; |
9e0b22f4 SH |
136 | } |
137 | ||
83f64091 | 138 | int path_is_absolute(const char *path) |
3b0d4f61 | 139 | { |
21664424 FB |
140 | #ifdef _WIN32 |
141 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 142 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 143 | return 1; |
f53f4da9 PB |
144 | } |
145 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 146 | #else |
f53f4da9 | 147 | return (*path == '/'); |
3b9f94e1 | 148 | #endif |
3b0d4f61 FB |
149 | } |
150 | ||
83f64091 FB |
151 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
152 | path to it by considering it is relative to base_path. URL are | |
153 | supported. */ | |
154 | void path_combine(char *dest, int dest_size, | |
155 | const char *base_path, | |
156 | const char *filename) | |
3b0d4f61 | 157 | { |
83f64091 FB |
158 | const char *p, *p1; |
159 | int len; | |
160 | ||
161 | if (dest_size <= 0) | |
162 | return; | |
163 | if (path_is_absolute(filename)) { | |
164 | pstrcpy(dest, dest_size, filename); | |
165 | } else { | |
0d54a6fe HR |
166 | const char *protocol_stripped = NULL; |
167 | ||
168 | if (path_has_protocol(base_path)) { | |
169 | protocol_stripped = strchr(base_path, ':'); | |
170 | if (protocol_stripped) { | |
171 | protocol_stripped++; | |
172 | } | |
173 | } | |
174 | p = protocol_stripped ?: base_path; | |
175 | ||
3b9f94e1 FB |
176 | p1 = strrchr(base_path, '/'); |
177 | #ifdef _WIN32 | |
178 | { | |
179 | const char *p2; | |
180 | p2 = strrchr(base_path, '\\'); | |
181 | if (!p1 || p2 > p1) | |
182 | p1 = p2; | |
183 | } | |
184 | #endif | |
83f64091 FB |
185 | if (p1) |
186 | p1++; | |
187 | else | |
188 | p1 = base_path; | |
189 | if (p1 > p) | |
190 | p = p1; | |
191 | len = p - base_path; | |
192 | if (len > dest_size - 1) | |
193 | len = dest_size - 1; | |
194 | memcpy(dest, base_path, len); | |
195 | dest[len] = '\0'; | |
196 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 197 | } |
3b0d4f61 FB |
198 | } |
199 | ||
03c320d8 HR |
200 | /* |
201 | * Helper function for bdrv_parse_filename() implementations to remove optional | |
202 | * protocol prefixes (especially "file:") from a filename and for putting the | |
203 | * stripped filename into the options QDict if there is such a prefix. | |
204 | */ | |
205 | void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, | |
206 | QDict *options) | |
207 | { | |
208 | if (strstart(filename, prefix, &filename)) { | |
209 | /* Stripping the explicit protocol prefix may result in a protocol | |
210 | * prefix being (wrongly) detected (if the filename contains a colon) */ | |
211 | if (path_has_protocol(filename)) { | |
212 | QString *fat_filename; | |
213 | ||
214 | /* This means there is some colon before the first slash; therefore, | |
215 | * this cannot be an absolute path */ | |
216 | assert(!path_is_absolute(filename)); | |
217 | ||
218 | /* And we can thus fix the protocol detection issue by prefixing it | |
219 | * by "./" */ | |
220 | fat_filename = qstring_from_str("./"); | |
221 | qstring_append(fat_filename, filename); | |
222 | ||
223 | assert(!path_has_protocol(qstring_get_str(fat_filename))); | |
224 | ||
225 | qdict_put(options, "filename", fat_filename); | |
226 | } else { | |
227 | /* If no protocol prefix was detected, we can use the shortened | |
228 | * filename as-is */ | |
229 | qdict_put_str(options, "filename", filename); | |
230 | } | |
231 | } | |
232 | } | |
233 | ||
234 | ||
9c5e6594 KW |
235 | /* Returns whether the image file is opened as read-only. Note that this can |
236 | * return false and writing to the image file is still not possible because the | |
237 | * image is inactivated. */ | |
93ed524e JC |
238 | bool bdrv_is_read_only(BlockDriverState *bs) |
239 | { | |
240 | return bs->read_only; | |
241 | } | |
242 | ||
9c5e6594 KW |
243 | /* Returns whether the image file can be written to right now */ |
244 | bool bdrv_is_writable(BlockDriverState *bs) | |
245 | { | |
246 | return !bdrv_is_read_only(bs) && !(bs->open_flags & BDRV_O_INACTIVE); | |
247 | } | |
248 | ||
54a32bfe KW |
249 | int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, |
250 | bool ignore_allow_rdw, Error **errp) | |
fe5241bf | 251 | { |
e2b8247a JC |
252 | /* Do not set read_only if copy_on_read is enabled */ |
253 | if (bs->copy_on_read && read_only) { | |
254 | error_setg(errp, "Can't set node '%s' to r/o with copy-on-read enabled", | |
255 | bdrv_get_device_or_node_name(bs)); | |
256 | return -EINVAL; | |
257 | } | |
258 | ||
d6fcdf06 | 259 | /* Do not clear read_only if it is prohibited */ |
54a32bfe KW |
260 | if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR) && |
261 | !ignore_allow_rdw) | |
262 | { | |
d6fcdf06 JC |
263 | error_setg(errp, "Node '%s' is read only", |
264 | bdrv_get_device_or_node_name(bs)); | |
265 | return -EPERM; | |
266 | } | |
267 | ||
45803a03 JC |
268 | return 0; |
269 | } | |
270 | ||
271 | int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp) | |
272 | { | |
273 | int ret = 0; | |
274 | ||
54a32bfe | 275 | ret = bdrv_can_set_read_only(bs, read_only, false, errp); |
45803a03 JC |
276 | if (ret < 0) { |
277 | return ret; | |
278 | } | |
279 | ||
fe5241bf | 280 | bs->read_only = read_only; |
e2b8247a | 281 | return 0; |
fe5241bf JC |
282 | } |
283 | ||
0a82855a HR |
284 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
285 | const char *backing, | |
9f07429e HR |
286 | char *dest, size_t sz, |
287 | Error **errp) | |
dc5a1371 | 288 | { |
9f07429e HR |
289 | if (backing[0] == '\0' || path_has_protocol(backing) || |
290 | path_is_absolute(backing)) | |
291 | { | |
0a82855a | 292 | pstrcpy(dest, sz, backing); |
9f07429e HR |
293 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
294 | error_setg(errp, "Cannot use relative backing file names for '%s'", | |
295 | backed); | |
dc5a1371 | 296 | } else { |
0a82855a | 297 | path_combine(dest, sz, backed, backing); |
dc5a1371 PB |
298 | } |
299 | } | |
300 | ||
9f07429e HR |
301 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
302 | Error **errp) | |
0a82855a | 303 | { |
9f07429e HR |
304 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
305 | ||
306 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, | |
307 | dest, sz, errp); | |
0a82855a HR |
308 | } |
309 | ||
0eb7217e SH |
310 | void bdrv_register(BlockDriver *bdrv) |
311 | { | |
8a22f02a | 312 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 313 | } |
b338082b | 314 | |
e4e9986b MA |
315 | BlockDriverState *bdrv_new(void) |
316 | { | |
317 | BlockDriverState *bs; | |
318 | int i; | |
319 | ||
5839e53b | 320 | bs = g_new0(BlockDriverState, 1); |
e4654d2d | 321 | QLIST_INIT(&bs->dirty_bitmaps); |
fbe40ff7 FZ |
322 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
323 | QLIST_INIT(&bs->op_blockers[i]); | |
324 | } | |
d616b224 | 325 | notifier_with_return_list_init(&bs->before_write_notifiers); |
3783fa3d | 326 | qemu_co_mutex_init(&bs->reqs_lock); |
2119882c | 327 | qemu_mutex_init(&bs->dirty_bitmap_mutex); |
9fcb0251 | 328 | bs->refcnt = 1; |
dcd04228 | 329 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 330 | |
3ff2f67a EY |
331 | qemu_co_queue_init(&bs->flush_queue); |
332 | ||
2c1d04e0 HR |
333 | QTAILQ_INSERT_TAIL(&all_bdrv_states, bs, bs_list); |
334 | ||
b338082b FB |
335 | return bs; |
336 | } | |
337 | ||
88d88798 | 338 | static BlockDriver *bdrv_do_find_format(const char *format_name) |
ea2384d3 FB |
339 | { |
340 | BlockDriver *drv1; | |
88d88798 | 341 | |
8a22f02a SH |
342 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
343 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 344 | return drv1; |
8a22f02a | 345 | } |
ea2384d3 | 346 | } |
88d88798 | 347 | |
ea2384d3 FB |
348 | return NULL; |
349 | } | |
350 | ||
88d88798 MM |
351 | BlockDriver *bdrv_find_format(const char *format_name) |
352 | { | |
353 | BlockDriver *drv1; | |
354 | int i; | |
355 | ||
356 | drv1 = bdrv_do_find_format(format_name); | |
357 | if (drv1) { | |
358 | return drv1; | |
359 | } | |
360 | ||
361 | /* The driver isn't registered, maybe we need to load a module */ | |
362 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { | |
363 | if (!strcmp(block_driver_modules[i].format_name, format_name)) { | |
364 | block_module_load_one(block_driver_modules[i].library_name); | |
365 | break; | |
366 | } | |
367 | } | |
368 | ||
369 | return bdrv_do_find_format(format_name); | |
370 | } | |
371 | ||
b64ec4e4 | 372 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 373 | { |
b64ec4e4 FZ |
374 | static const char *whitelist_rw[] = { |
375 | CONFIG_BDRV_RW_WHITELIST | |
376 | }; | |
377 | static const char *whitelist_ro[] = { | |
378 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
379 | }; |
380 | const char **p; | |
381 | ||
b64ec4e4 | 382 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 383 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 384 | } |
eb852011 | 385 | |
b64ec4e4 | 386 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
387 | if (!strcmp(drv->format_name, *p)) { |
388 | return 1; | |
389 | } | |
390 | } | |
b64ec4e4 FZ |
391 | if (read_only) { |
392 | for (p = whitelist_ro; *p; p++) { | |
393 | if (!strcmp(drv->format_name, *p)) { | |
394 | return 1; | |
395 | } | |
396 | } | |
397 | } | |
eb852011 MA |
398 | return 0; |
399 | } | |
400 | ||
e6ff69bf DB |
401 | bool bdrv_uses_whitelist(void) |
402 | { | |
403 | return use_bdrv_whitelist; | |
404 | } | |
405 | ||
5b7e1542 ZYW |
406 | typedef struct CreateCo { |
407 | BlockDriver *drv; | |
408 | char *filename; | |
83d0521a | 409 | QemuOpts *opts; |
5b7e1542 | 410 | int ret; |
cc84d90f | 411 | Error *err; |
5b7e1542 ZYW |
412 | } CreateCo; |
413 | ||
414 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
415 | { | |
cc84d90f HR |
416 | Error *local_err = NULL; |
417 | int ret; | |
418 | ||
5b7e1542 ZYW |
419 | CreateCo *cco = opaque; |
420 | assert(cco->drv); | |
421 | ||
c282e1fd | 422 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
621ff94d | 423 | error_propagate(&cco->err, local_err); |
cc84d90f | 424 | cco->ret = ret; |
5b7e1542 ZYW |
425 | } |
426 | ||
0e7e1989 | 427 | int bdrv_create(BlockDriver *drv, const char* filename, |
83d0521a | 428 | QemuOpts *opts, Error **errp) |
ea2384d3 | 429 | { |
5b7e1542 ZYW |
430 | int ret; |
431 | ||
432 | Coroutine *co; | |
433 | CreateCo cco = { | |
434 | .drv = drv, | |
435 | .filename = g_strdup(filename), | |
83d0521a | 436 | .opts = opts, |
5b7e1542 | 437 | .ret = NOT_DONE, |
cc84d90f | 438 | .err = NULL, |
5b7e1542 ZYW |
439 | }; |
440 | ||
c282e1fd | 441 | if (!drv->bdrv_create) { |
cc84d90f | 442 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
443 | ret = -ENOTSUP; |
444 | goto out; | |
5b7e1542 ZYW |
445 | } |
446 | ||
447 | if (qemu_in_coroutine()) { | |
448 | /* Fast-path if already in coroutine context */ | |
449 | bdrv_create_co_entry(&cco); | |
450 | } else { | |
0b8b8753 PB |
451 | co = qemu_coroutine_create(bdrv_create_co_entry, &cco); |
452 | qemu_coroutine_enter(co); | |
5b7e1542 | 453 | while (cco.ret == NOT_DONE) { |
b47ec2c4 | 454 | aio_poll(qemu_get_aio_context(), true); |
5b7e1542 ZYW |
455 | } |
456 | } | |
457 | ||
458 | ret = cco.ret; | |
cc84d90f | 459 | if (ret < 0) { |
84d18f06 | 460 | if (cco.err) { |
cc84d90f HR |
461 | error_propagate(errp, cco.err); |
462 | } else { | |
463 | error_setg_errno(errp, -ret, "Could not create image"); | |
464 | } | |
465 | } | |
0e7e1989 | 466 | |
80168bff LC |
467 | out: |
468 | g_free(cco.filename); | |
5b7e1542 | 469 | return ret; |
ea2384d3 FB |
470 | } |
471 | ||
c282e1fd | 472 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
84a12e66 CH |
473 | { |
474 | BlockDriver *drv; | |
cc84d90f HR |
475 | Error *local_err = NULL; |
476 | int ret; | |
84a12e66 | 477 | |
b65a5e12 | 478 | drv = bdrv_find_protocol(filename, true, errp); |
84a12e66 | 479 | if (drv == NULL) { |
16905d71 | 480 | return -ENOENT; |
84a12e66 CH |
481 | } |
482 | ||
c282e1fd | 483 | ret = bdrv_create(drv, filename, opts, &local_err); |
621ff94d | 484 | error_propagate(errp, local_err); |
cc84d90f | 485 | return ret; |
84a12e66 CH |
486 | } |
487 | ||
892b7de8 ET |
488 | /** |
489 | * Try to get @bs's logical and physical block size. | |
490 | * On success, store them in @bsz struct and return 0. | |
491 | * On failure return -errno. | |
492 | * @bs must not be empty. | |
493 | */ | |
494 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) | |
495 | { | |
496 | BlockDriver *drv = bs->drv; | |
497 | ||
498 | if (drv && drv->bdrv_probe_blocksizes) { | |
499 | return drv->bdrv_probe_blocksizes(bs, bsz); | |
500 | } | |
501 | ||
502 | return -ENOTSUP; | |
503 | } | |
504 | ||
505 | /** | |
506 | * Try to get @bs's geometry (cyls, heads, sectors). | |
507 | * On success, store them in @geo struct and return 0. | |
508 | * On failure return -errno. | |
509 | * @bs must not be empty. | |
510 | */ | |
511 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
512 | { | |
513 | BlockDriver *drv = bs->drv; | |
514 | ||
515 | if (drv && drv->bdrv_probe_geometry) { | |
516 | return drv->bdrv_probe_geometry(bs, geo); | |
517 | } | |
518 | ||
519 | return -ENOTSUP; | |
520 | } | |
521 | ||
eba25057 JM |
522 | /* |
523 | * Create a uniquely-named empty temporary file. | |
524 | * Return 0 upon success, otherwise a negative errno value. | |
525 | */ | |
526 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 527 | { |
eba25057 | 528 | #ifdef _WIN32 |
3b9f94e1 | 529 | char temp_dir[MAX_PATH]; |
eba25057 JM |
530 | /* GetTempFileName requires that its output buffer (4th param) |
531 | have length MAX_PATH or greater. */ | |
532 | assert(size >= MAX_PATH); | |
533 | return (GetTempPath(MAX_PATH, temp_dir) | |
534 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
535 | ? 0 : -GetLastError()); | |
d5249393 | 536 | #else |
67b915a5 | 537 | int fd; |
7ccfb2eb | 538 | const char *tmpdir; |
0badc1ee | 539 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
540 | if (!tmpdir) { |
541 | tmpdir = "/var/tmp"; | |
542 | } | |
eba25057 JM |
543 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
544 | return -EOVERFLOW; | |
545 | } | |
ea2384d3 | 546 | fd = mkstemp(filename); |
fe235a06 DH |
547 | if (fd < 0) { |
548 | return -errno; | |
549 | } | |
550 | if (close(fd) != 0) { | |
551 | unlink(filename); | |
eba25057 JM |
552 | return -errno; |
553 | } | |
554 | return 0; | |
d5249393 | 555 | #endif |
eba25057 | 556 | } |
fc01f7e7 | 557 | |
84a12e66 CH |
558 | /* |
559 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
560 | * recognized as a host CDROM. | |
561 | */ | |
562 | static BlockDriver *find_hdev_driver(const char *filename) | |
563 | { | |
564 | int score_max = 0, score; | |
565 | BlockDriver *drv = NULL, *d; | |
566 | ||
567 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
568 | if (d->bdrv_probe_device) { | |
569 | score = d->bdrv_probe_device(filename); | |
570 | if (score > score_max) { | |
571 | score_max = score; | |
572 | drv = d; | |
573 | } | |
574 | } | |
575 | } | |
576 | ||
577 | return drv; | |
578 | } | |
579 | ||
88d88798 MM |
580 | static BlockDriver *bdrv_do_find_protocol(const char *protocol) |
581 | { | |
582 | BlockDriver *drv1; | |
583 | ||
584 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
585 | if (drv1->protocol_name && !strcmp(drv1->protocol_name, protocol)) { | |
586 | return drv1; | |
587 | } | |
588 | } | |
589 | ||
590 | return NULL; | |
591 | } | |
592 | ||
98289620 | 593 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
594 | bool allow_protocol_prefix, |
595 | Error **errp) | |
83f64091 FB |
596 | { |
597 | BlockDriver *drv1; | |
598 | char protocol[128]; | |
1cec71e3 | 599 | int len; |
83f64091 | 600 | const char *p; |
88d88798 | 601 | int i; |
19cb3738 | 602 | |
66f82cee KW |
603 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
604 | ||
39508e7a CH |
605 | /* |
606 | * XXX(hch): we really should not let host device detection | |
607 | * override an explicit protocol specification, but moving this | |
608 | * later breaks access to device names with colons in them. | |
609 | * Thanks to the brain-dead persistent naming schemes on udev- | |
610 | * based Linux systems those actually are quite common. | |
611 | */ | |
612 | drv1 = find_hdev_driver(filename); | |
613 | if (drv1) { | |
614 | return drv1; | |
615 | } | |
616 | ||
98289620 | 617 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
ef810437 | 618 | return &bdrv_file; |
84a12e66 | 619 | } |
98289620 | 620 | |
9e0b22f4 SH |
621 | p = strchr(filename, ':'); |
622 | assert(p != NULL); | |
1cec71e3 AL |
623 | len = p - filename; |
624 | if (len > sizeof(protocol) - 1) | |
625 | len = sizeof(protocol) - 1; | |
626 | memcpy(protocol, filename, len); | |
627 | protocol[len] = '\0'; | |
88d88798 MM |
628 | |
629 | drv1 = bdrv_do_find_protocol(protocol); | |
630 | if (drv1) { | |
631 | return drv1; | |
632 | } | |
633 | ||
634 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); ++i) { | |
635 | if (block_driver_modules[i].protocol_name && | |
636 | !strcmp(block_driver_modules[i].protocol_name, protocol)) { | |
637 | block_module_load_one(block_driver_modules[i].library_name); | |
638 | break; | |
8a22f02a | 639 | } |
83f64091 | 640 | } |
b65a5e12 | 641 | |
88d88798 MM |
642 | drv1 = bdrv_do_find_protocol(protocol); |
643 | if (!drv1) { | |
644 | error_setg(errp, "Unknown protocol '%s'", protocol); | |
645 | } | |
646 | return drv1; | |
83f64091 FB |
647 | } |
648 | ||
c6684249 MA |
649 | /* |
650 | * Guess image format by probing its contents. | |
651 | * This is not a good idea when your image is raw (CVE-2008-2004), but | |
652 | * we do it anyway for backward compatibility. | |
653 | * | |
654 | * @buf contains the image's first @buf_size bytes. | |
7cddd372 KW |
655 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
656 | * but can be smaller if the image file is smaller) | |
c6684249 MA |
657 | * @filename is its filename. |
658 | * | |
659 | * For all block drivers, call the bdrv_probe() method to get its | |
660 | * probing score. | |
661 | * Return the first block driver with the highest probing score. | |
662 | */ | |
38f3ef57 KW |
663 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
664 | const char *filename) | |
c6684249 MA |
665 | { |
666 | int score_max = 0, score; | |
667 | BlockDriver *drv = NULL, *d; | |
668 | ||
669 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
670 | if (d->bdrv_probe) { | |
671 | score = d->bdrv_probe(buf, buf_size, filename); | |
672 | if (score > score_max) { | |
673 | score_max = score; | |
674 | drv = d; | |
675 | } | |
676 | } | |
677 | } | |
678 | ||
679 | return drv; | |
680 | } | |
681 | ||
5696c6e3 | 682 | static int find_image_format(BlockBackend *file, const char *filename, |
34b5d2c6 | 683 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 684 | { |
c6684249 | 685 | BlockDriver *drv; |
7cddd372 | 686 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
f500a6d3 | 687 | int ret = 0; |
f8ea0b00 | 688 | |
08a00559 | 689 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
5696c6e3 | 690 | if (blk_is_sg(file) || !blk_is_inserted(file) || blk_getlength(file) == 0) { |
ef810437 | 691 | *pdrv = &bdrv_raw; |
c98ac35d | 692 | return ret; |
1a396859 | 693 | } |
f8ea0b00 | 694 | |
5696c6e3 | 695 | ret = blk_pread(file, 0, buf, sizeof(buf)); |
83f64091 | 696 | if (ret < 0) { |
34b5d2c6 HR |
697 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
698 | "format"); | |
c98ac35d SW |
699 | *pdrv = NULL; |
700 | return ret; | |
83f64091 FB |
701 | } |
702 | ||
c6684249 | 703 | drv = bdrv_probe_all(buf, ret, filename); |
c98ac35d | 704 | if (!drv) { |
34b5d2c6 HR |
705 | error_setg(errp, "Could not determine image format: No compatible " |
706 | "driver found"); | |
c98ac35d SW |
707 | ret = -ENOENT; |
708 | } | |
709 | *pdrv = drv; | |
710 | return ret; | |
ea2384d3 FB |
711 | } |
712 | ||
51762288 SH |
713 | /** |
714 | * Set the current 'total_sectors' value | |
65a9bb25 | 715 | * Return 0 on success, -errno on error. |
51762288 SH |
716 | */ |
717 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
718 | { | |
719 | BlockDriver *drv = bs->drv; | |
720 | ||
396759ad | 721 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
b192af8a | 722 | if (bdrv_is_sg(bs)) |
396759ad NB |
723 | return 0; |
724 | ||
51762288 SH |
725 | /* query actual device if possible, otherwise just trust the hint */ |
726 | if (drv->bdrv_getlength) { | |
727 | int64_t length = drv->bdrv_getlength(bs); | |
728 | if (length < 0) { | |
729 | return length; | |
730 | } | |
7e382003 | 731 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
732 | } |
733 | ||
734 | bs->total_sectors = hint; | |
735 | return 0; | |
736 | } | |
737 | ||
cddff5ba KW |
738 | /** |
739 | * Combines a QDict of new block driver @options with any missing options taken | |
740 | * from @old_options, so that leaving out an option defaults to its old value. | |
741 | */ | |
742 | static void bdrv_join_options(BlockDriverState *bs, QDict *options, | |
743 | QDict *old_options) | |
744 | { | |
745 | if (bs->drv && bs->drv->bdrv_join_options) { | |
746 | bs->drv->bdrv_join_options(options, old_options); | |
747 | } else { | |
748 | qdict_join(options, old_options, false); | |
749 | } | |
750 | } | |
751 | ||
9e8f1835 PB |
752 | /** |
753 | * Set open flags for a given discard mode | |
754 | * | |
755 | * Return 0 on success, -1 if the discard mode was invalid. | |
756 | */ | |
757 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
758 | { | |
759 | *flags &= ~BDRV_O_UNMAP; | |
760 | ||
761 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
762 | /* do nothing */ | |
763 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
764 | *flags |= BDRV_O_UNMAP; | |
765 | } else { | |
766 | return -1; | |
767 | } | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
c3993cdc SH |
772 | /** |
773 | * Set open flags for a given cache mode | |
774 | * | |
775 | * Return 0 on success, -1 if the cache mode was invalid. | |
776 | */ | |
53e8ae01 | 777 | int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough) |
c3993cdc SH |
778 | { |
779 | *flags &= ~BDRV_O_CACHE_MASK; | |
780 | ||
781 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
53e8ae01 KW |
782 | *writethrough = false; |
783 | *flags |= BDRV_O_NOCACHE; | |
92196b2f | 784 | } else if (!strcmp(mode, "directsync")) { |
53e8ae01 | 785 | *writethrough = true; |
92196b2f | 786 | *flags |= BDRV_O_NOCACHE; |
c3993cdc | 787 | } else if (!strcmp(mode, "writeback")) { |
53e8ae01 | 788 | *writethrough = false; |
c3993cdc | 789 | } else if (!strcmp(mode, "unsafe")) { |
53e8ae01 | 790 | *writethrough = false; |
c3993cdc SH |
791 | *flags |= BDRV_O_NO_FLUSH; |
792 | } else if (!strcmp(mode, "writethrough")) { | |
53e8ae01 | 793 | *writethrough = true; |
c3993cdc SH |
794 | } else { |
795 | return -1; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
b5411555 KW |
801 | static char *bdrv_child_get_parent_desc(BdrvChild *c) |
802 | { | |
803 | BlockDriverState *parent = c->opaque; | |
804 | return g_strdup(bdrv_get_device_or_node_name(parent)); | |
805 | } | |
806 | ||
20018e12 KW |
807 | static void bdrv_child_cb_drained_begin(BdrvChild *child) |
808 | { | |
809 | BlockDriverState *bs = child->opaque; | |
810 | bdrv_drained_begin(bs); | |
811 | } | |
812 | ||
813 | static void bdrv_child_cb_drained_end(BdrvChild *child) | |
814 | { | |
815 | BlockDriverState *bs = child->opaque; | |
816 | bdrv_drained_end(bs); | |
817 | } | |
818 | ||
38701b6a KW |
819 | static int bdrv_child_cb_inactivate(BdrvChild *child) |
820 | { | |
821 | BlockDriverState *bs = child->opaque; | |
822 | assert(bs->open_flags & BDRV_O_INACTIVE); | |
823 | return 0; | |
824 | } | |
825 | ||
b1e6fc08 | 826 | /* |
73176bee KW |
827 | * Returns the options and flags that a temporary snapshot should get, based on |
828 | * the originally requested flags (the originally requested image will have | |
829 | * flags like a backing file) | |
b1e6fc08 | 830 | */ |
73176bee KW |
831 | static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options, |
832 | int parent_flags, QDict *parent_options) | |
b1e6fc08 | 833 | { |
73176bee KW |
834 | *child_flags = (parent_flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
835 | ||
836 | /* For temporary files, unconditional cache=unsafe is fine */ | |
73176bee KW |
837 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_DIRECT, "off"); |
838 | qdict_set_default_str(child_options, BDRV_OPT_CACHE_NO_FLUSH, "on"); | |
41869044 | 839 | |
f87a0e29 AG |
840 | /* Copy the read-only option from the parent */ |
841 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); | |
842 | ||
41869044 KW |
843 | /* aio=native doesn't work for cache.direct=off, so disable it for the |
844 | * temporary snapshot */ | |
845 | *child_flags &= ~BDRV_O_NATIVE_AIO; | |
b1e6fc08 KW |
846 | } |
847 | ||
0b50cc88 | 848 | /* |
8e2160e2 KW |
849 | * Returns the options and flags that bs->file should get if a protocol driver |
850 | * is expected, based on the given options and flags for the parent BDS | |
0b50cc88 | 851 | */ |
8e2160e2 KW |
852 | static void bdrv_inherited_options(int *child_flags, QDict *child_options, |
853 | int parent_flags, QDict *parent_options) | |
0b50cc88 | 854 | { |
8e2160e2 KW |
855 | int flags = parent_flags; |
856 | ||
0b50cc88 KW |
857 | /* Enable protocol handling, disable format probing for bs->file */ |
858 | flags |= BDRV_O_PROTOCOL; | |
859 | ||
91a097e7 KW |
860 | /* If the cache mode isn't explicitly set, inherit direct and no-flush from |
861 | * the parent. */ | |
862 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); | |
863 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); | |
5a9347c6 | 864 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
91a097e7 | 865 | |
f87a0e29 AG |
866 | /* Inherit the read-only option from the parent if it's not set */ |
867 | qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY); | |
868 | ||
0b50cc88 | 869 | /* Our block drivers take care to send flushes and respect unmap policy, |
91a097e7 KW |
870 | * so we can default to enable both on lower layers regardless of the |
871 | * corresponding parent options. */ | |
818584a4 | 872 | qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap"); |
0b50cc88 | 873 | |
0b50cc88 | 874 | /* Clear flags that only apply to the top layer */ |
abb06c5a DB |
875 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ | |
876 | BDRV_O_NO_IO); | |
0b50cc88 | 877 | |
8e2160e2 | 878 | *child_flags = flags; |
0b50cc88 KW |
879 | } |
880 | ||
f3930ed0 | 881 | const BdrvChildRole child_file = { |
b5411555 | 882 | .get_parent_desc = bdrv_child_get_parent_desc, |
8e2160e2 | 883 | .inherit_options = bdrv_inherited_options, |
20018e12 KW |
884 | .drained_begin = bdrv_child_cb_drained_begin, |
885 | .drained_end = bdrv_child_cb_drained_end, | |
38701b6a | 886 | .inactivate = bdrv_child_cb_inactivate, |
f3930ed0 KW |
887 | }; |
888 | ||
889 | /* | |
8e2160e2 KW |
890 | * Returns the options and flags that bs->file should get if the use of formats |
891 | * (and not only protocols) is permitted for it, based on the given options and | |
892 | * flags for the parent BDS | |
f3930ed0 | 893 | */ |
8e2160e2 KW |
894 | static void bdrv_inherited_fmt_options(int *child_flags, QDict *child_options, |
895 | int parent_flags, QDict *parent_options) | |
f3930ed0 | 896 | { |
8e2160e2 KW |
897 | child_file.inherit_options(child_flags, child_options, |
898 | parent_flags, parent_options); | |
899 | ||
abb06c5a | 900 | *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO); |
f3930ed0 KW |
901 | } |
902 | ||
903 | const BdrvChildRole child_format = { | |
b5411555 | 904 | .get_parent_desc = bdrv_child_get_parent_desc, |
8e2160e2 | 905 | .inherit_options = bdrv_inherited_fmt_options, |
20018e12 KW |
906 | .drained_begin = bdrv_child_cb_drained_begin, |
907 | .drained_end = bdrv_child_cb_drained_end, | |
38701b6a | 908 | .inactivate = bdrv_child_cb_inactivate, |
f3930ed0 KW |
909 | }; |
910 | ||
db95dbba KW |
911 | static void bdrv_backing_attach(BdrvChild *c) |
912 | { | |
913 | BlockDriverState *parent = c->opaque; | |
914 | BlockDriverState *backing_hd = c->bs; | |
915 | ||
916 | assert(!parent->backing_blocker); | |
917 | error_setg(&parent->backing_blocker, | |
918 | "node is used as backing hd of '%s'", | |
919 | bdrv_get_device_or_node_name(parent)); | |
920 | ||
921 | parent->open_flags &= ~BDRV_O_NO_BACKING; | |
922 | pstrcpy(parent->backing_file, sizeof(parent->backing_file), | |
923 | backing_hd->filename); | |
924 | pstrcpy(parent->backing_format, sizeof(parent->backing_format), | |
925 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
926 | ||
927 | bdrv_op_block_all(backing_hd, parent->backing_blocker); | |
928 | /* Otherwise we won't be able to commit or stream */ | |
929 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, | |
930 | parent->backing_blocker); | |
931 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_STREAM, | |
932 | parent->backing_blocker); | |
933 | /* | |
934 | * We do backup in 3 ways: | |
935 | * 1. drive backup | |
936 | * The target bs is new opened, and the source is top BDS | |
937 | * 2. blockdev backup | |
938 | * Both the source and the target are top BDSes. | |
939 | * 3. internal backup(used for block replication) | |
940 | * Both the source and the target are backing file | |
941 | * | |
942 | * In case 1 and 2, neither the source nor the target is the backing file. | |
943 | * In case 3, we will block the top BDS, so there is only one block job | |
944 | * for the top BDS and its backing chain. | |
945 | */ | |
946 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_SOURCE, | |
947 | parent->backing_blocker); | |
948 | bdrv_op_unblock(backing_hd, BLOCK_OP_TYPE_BACKUP_TARGET, | |
949 | parent->backing_blocker); | |
950 | } | |
951 | ||
952 | static void bdrv_backing_detach(BdrvChild *c) | |
953 | { | |
954 | BlockDriverState *parent = c->opaque; | |
955 | ||
956 | assert(parent->backing_blocker); | |
957 | bdrv_op_unblock_all(c->bs, parent->backing_blocker); | |
958 | error_free(parent->backing_blocker); | |
959 | parent->backing_blocker = NULL; | |
960 | } | |
961 | ||
317fc44e | 962 | /* |
8e2160e2 KW |
963 | * Returns the options and flags that bs->backing should get, based on the |
964 | * given options and flags for the parent BDS | |
317fc44e | 965 | */ |
8e2160e2 KW |
966 | static void bdrv_backing_options(int *child_flags, QDict *child_options, |
967 | int parent_flags, QDict *parent_options) | |
317fc44e | 968 | { |
8e2160e2 KW |
969 | int flags = parent_flags; |
970 | ||
b8816a43 KW |
971 | /* The cache mode is inherited unmodified for backing files; except WCE, |
972 | * which is only applied on the top level (BlockBackend) */ | |
91a097e7 KW |
973 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT); |
974 | qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH); | |
5a9347c6 | 975 | qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE); |
91a097e7 | 976 | |
317fc44e | 977 | /* backing files always opened read-only */ |
f87a0e29 AG |
978 | qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on"); |
979 | flags &= ~BDRV_O_COPY_ON_READ; | |
317fc44e KW |
980 | |
981 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 982 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e | 983 | |
8e2160e2 | 984 | *child_flags = flags; |
317fc44e KW |
985 | } |
986 | ||
91ef3825 | 987 | const BdrvChildRole child_backing = { |
b5411555 | 988 | .get_parent_desc = bdrv_child_get_parent_desc, |
db95dbba KW |
989 | .attach = bdrv_backing_attach, |
990 | .detach = bdrv_backing_detach, | |
8e2160e2 | 991 | .inherit_options = bdrv_backing_options, |
20018e12 KW |
992 | .drained_begin = bdrv_child_cb_drained_begin, |
993 | .drained_end = bdrv_child_cb_drained_end, | |
38701b6a | 994 | .inactivate = bdrv_child_cb_inactivate, |
f3930ed0 KW |
995 | }; |
996 | ||
7b272452 KW |
997 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
998 | { | |
61de4c68 | 999 | int open_flags = flags; |
7b272452 KW |
1000 | |
1001 | /* | |
1002 | * Clear flags that are internal to the block layer before opening the | |
1003 | * image. | |
1004 | */ | |
20cca275 | 1005 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 KW |
1006 | |
1007 | /* | |
1008 | * Snapshots should be writable. | |
1009 | */ | |
8bfea15d | 1010 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
1011 | open_flags |= BDRV_O_RDWR; |
1012 | } | |
1013 | ||
1014 | return open_flags; | |
1015 | } | |
1016 | ||
91a097e7 KW |
1017 | static void update_flags_from_options(int *flags, QemuOpts *opts) |
1018 | { | |
1019 | *flags &= ~BDRV_O_CACHE_MASK; | |
1020 | ||
91a097e7 KW |
1021 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_NO_FLUSH)); |
1022 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_NO_FLUSH, false)) { | |
1023 | *flags |= BDRV_O_NO_FLUSH; | |
1024 | } | |
1025 | ||
1026 | assert(qemu_opt_find(opts, BDRV_OPT_CACHE_DIRECT)); | |
1027 | if (qemu_opt_get_bool(opts, BDRV_OPT_CACHE_DIRECT, false)) { | |
1028 | *flags |= BDRV_O_NOCACHE; | |
1029 | } | |
f87a0e29 AG |
1030 | |
1031 | *flags &= ~BDRV_O_RDWR; | |
1032 | ||
1033 | assert(qemu_opt_find(opts, BDRV_OPT_READ_ONLY)); | |
1034 | if (!qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false)) { | |
1035 | *flags |= BDRV_O_RDWR; | |
1036 | } | |
1037 | ||
91a097e7 KW |
1038 | } |
1039 | ||
1040 | static void update_options_from_flags(QDict *options, int flags) | |
1041 | { | |
91a097e7 | 1042 | if (!qdict_haskey(options, BDRV_OPT_CACHE_DIRECT)) { |
46f5ac20 | 1043 | qdict_put_bool(options, BDRV_OPT_CACHE_DIRECT, flags & BDRV_O_NOCACHE); |
91a097e7 KW |
1044 | } |
1045 | if (!qdict_haskey(options, BDRV_OPT_CACHE_NO_FLUSH)) { | |
46f5ac20 EB |
1046 | qdict_put_bool(options, BDRV_OPT_CACHE_NO_FLUSH, |
1047 | flags & BDRV_O_NO_FLUSH); | |
91a097e7 | 1048 | } |
f87a0e29 | 1049 | if (!qdict_haskey(options, BDRV_OPT_READ_ONLY)) { |
46f5ac20 | 1050 | qdict_put_bool(options, BDRV_OPT_READ_ONLY, !(flags & BDRV_O_RDWR)); |
f87a0e29 | 1051 | } |
91a097e7 KW |
1052 | } |
1053 | ||
636ea370 KW |
1054 | static void bdrv_assign_node_name(BlockDriverState *bs, |
1055 | const char *node_name, | |
1056 | Error **errp) | |
6913c0c2 | 1057 | { |
15489c76 | 1058 | char *gen_node_name = NULL; |
6913c0c2 | 1059 | |
15489c76 JC |
1060 | if (!node_name) { |
1061 | node_name = gen_node_name = id_generate(ID_BLOCK); | |
1062 | } else if (!id_wellformed(node_name)) { | |
1063 | /* | |
1064 | * Check for empty string or invalid characters, but not if it is | |
1065 | * generated (generated names use characters not available to the user) | |
1066 | */ | |
9aebf3b8 | 1067 | error_setg(errp, "Invalid node name"); |
636ea370 | 1068 | return; |
6913c0c2 BC |
1069 | } |
1070 | ||
0c5e94ee | 1071 | /* takes care of avoiding namespaces collisions */ |
7f06d47e | 1072 | if (blk_by_name(node_name)) { |
0c5e94ee BC |
1073 | error_setg(errp, "node-name=%s is conflicting with a device id", |
1074 | node_name); | |
15489c76 | 1075 | goto out; |
0c5e94ee BC |
1076 | } |
1077 | ||
6913c0c2 BC |
1078 | /* takes care of avoiding duplicates node names */ |
1079 | if (bdrv_find_node(node_name)) { | |
1080 | error_setg(errp, "Duplicate node name"); | |
15489c76 | 1081 | goto out; |
6913c0c2 BC |
1082 | } |
1083 | ||
1084 | /* copy node name into the bs and insert it into the graph list */ | |
1085 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
1086 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
15489c76 JC |
1087 | out: |
1088 | g_free(gen_node_name); | |
6913c0c2 BC |
1089 | } |
1090 | ||
01a56501 KW |
1091 | static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, |
1092 | const char *node_name, QDict *options, | |
1093 | int open_flags, Error **errp) | |
1094 | { | |
1095 | Error *local_err = NULL; | |
1096 | int ret; | |
1097 | ||
1098 | bdrv_assign_node_name(bs, node_name, &local_err); | |
1099 | if (local_err) { | |
1100 | error_propagate(errp, local_err); | |
1101 | return -EINVAL; | |
1102 | } | |
1103 | ||
1104 | bs->drv = drv; | |
680c7f96 | 1105 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
01a56501 KW |
1106 | bs->opaque = g_malloc0(drv->instance_size); |
1107 | ||
1108 | if (drv->bdrv_file_open) { | |
1109 | assert(!drv->bdrv_needs_filename || bs->filename[0]); | |
1110 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); | |
680c7f96 | 1111 | } else if (drv->bdrv_open) { |
01a56501 | 1112 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
680c7f96 KW |
1113 | } else { |
1114 | ret = 0; | |
01a56501 KW |
1115 | } |
1116 | ||
1117 | if (ret < 0) { | |
1118 | if (local_err) { | |
1119 | error_propagate(errp, local_err); | |
1120 | } else if (bs->filename[0]) { | |
1121 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
1122 | } else { | |
1123 | error_setg_errno(errp, -ret, "Could not open image"); | |
1124 | } | |
180ca19a | 1125 | goto open_failed; |
01a56501 KW |
1126 | } |
1127 | ||
1128 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
1129 | if (ret < 0) { | |
1130 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
180ca19a | 1131 | return ret; |
01a56501 KW |
1132 | } |
1133 | ||
1134 | bdrv_refresh_limits(bs, &local_err); | |
1135 | if (local_err) { | |
1136 | error_propagate(errp, local_err); | |
180ca19a | 1137 | return -EINVAL; |
01a56501 KW |
1138 | } |
1139 | ||
1140 | assert(bdrv_opt_mem_align(bs) != 0); | |
1141 | assert(bdrv_min_mem_align(bs) != 0); | |
1142 | assert(is_power_of_2(bs->bl.request_alignment)); | |
1143 | ||
1144 | return 0; | |
180ca19a MP |
1145 | open_failed: |
1146 | bs->drv = NULL; | |
1147 | if (bs->file != NULL) { | |
1148 | bdrv_unref_child(bs, bs->file); | |
1149 | bs->file = NULL; | |
1150 | } | |
01a56501 KW |
1151 | g_free(bs->opaque); |
1152 | bs->opaque = NULL; | |
01a56501 KW |
1153 | return ret; |
1154 | } | |
1155 | ||
680c7f96 KW |
1156 | BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, |
1157 | int flags, Error **errp) | |
1158 | { | |
1159 | BlockDriverState *bs; | |
1160 | int ret; | |
1161 | ||
1162 | bs = bdrv_new(); | |
1163 | bs->open_flags = flags; | |
1164 | bs->explicit_options = qdict_new(); | |
1165 | bs->options = qdict_new(); | |
1166 | bs->opaque = NULL; | |
1167 | ||
1168 | update_options_from_flags(bs->options, flags); | |
1169 | ||
1170 | ret = bdrv_open_driver(bs, drv, node_name, bs->options, flags, errp); | |
1171 | if (ret < 0) { | |
1172 | QDECREF(bs->explicit_options); | |
180ca19a | 1173 | bs->explicit_options = NULL; |
680c7f96 | 1174 | QDECREF(bs->options); |
180ca19a | 1175 | bs->options = NULL; |
680c7f96 KW |
1176 | bdrv_unref(bs); |
1177 | return NULL; | |
1178 | } | |
1179 | ||
1180 | return bs; | |
1181 | } | |
1182 | ||
c5f3014b | 1183 | QemuOptsList bdrv_runtime_opts = { |
18edf289 KW |
1184 | .name = "bdrv_common", |
1185 | .head = QTAILQ_HEAD_INITIALIZER(bdrv_runtime_opts.head), | |
1186 | .desc = { | |
1187 | { | |
1188 | .name = "node-name", | |
1189 | .type = QEMU_OPT_STRING, | |
1190 | .help = "Node name of the block device node", | |
1191 | }, | |
62392ebb KW |
1192 | { |
1193 | .name = "driver", | |
1194 | .type = QEMU_OPT_STRING, | |
1195 | .help = "Block driver to use for the node", | |
1196 | }, | |
91a097e7 KW |
1197 | { |
1198 | .name = BDRV_OPT_CACHE_DIRECT, | |
1199 | .type = QEMU_OPT_BOOL, | |
1200 | .help = "Bypass software writeback cache on the host", | |
1201 | }, | |
1202 | { | |
1203 | .name = BDRV_OPT_CACHE_NO_FLUSH, | |
1204 | .type = QEMU_OPT_BOOL, | |
1205 | .help = "Ignore flush requests", | |
1206 | }, | |
f87a0e29 AG |
1207 | { |
1208 | .name = BDRV_OPT_READ_ONLY, | |
1209 | .type = QEMU_OPT_BOOL, | |
1210 | .help = "Node is opened in read-only mode", | |
1211 | }, | |
692e01a2 KW |
1212 | { |
1213 | .name = "detect-zeroes", | |
1214 | .type = QEMU_OPT_STRING, | |
1215 | .help = "try to optimize zero writes (off, on, unmap)", | |
1216 | }, | |
818584a4 KW |
1217 | { |
1218 | .name = "discard", | |
1219 | .type = QEMU_OPT_STRING, | |
1220 | .help = "discard operation (ignore/off, unmap/on)", | |
1221 | }, | |
5a9347c6 FZ |
1222 | { |
1223 | .name = BDRV_OPT_FORCE_SHARE, | |
1224 | .type = QEMU_OPT_BOOL, | |
1225 | .help = "always accept other writers (default: off)", | |
1226 | }, | |
18edf289 KW |
1227 | { /* end of list */ } |
1228 | }, | |
1229 | }; | |
1230 | ||
57915332 KW |
1231 | /* |
1232 | * Common part for opening disk images and files | |
b6ad491a KW |
1233 | * |
1234 | * Removes all processed options from *options. | |
57915332 | 1235 | */ |
5696c6e3 | 1236 | static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file, |
82dc8b41 | 1237 | QDict *options, Error **errp) |
57915332 KW |
1238 | { |
1239 | int ret, open_flags; | |
035fccdf | 1240 | const char *filename; |
62392ebb | 1241 | const char *driver_name = NULL; |
6913c0c2 | 1242 | const char *node_name = NULL; |
818584a4 | 1243 | const char *discard; |
692e01a2 | 1244 | const char *detect_zeroes; |
18edf289 | 1245 | QemuOpts *opts; |
62392ebb | 1246 | BlockDriver *drv; |
34b5d2c6 | 1247 | Error *local_err = NULL; |
57915332 | 1248 | |
6405875c | 1249 | assert(bs->file == NULL); |
707ff828 | 1250 | assert(options != NULL && bs->options != options); |
57915332 | 1251 | |
62392ebb KW |
1252 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); |
1253 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
1254 | if (local_err) { | |
1255 | error_propagate(errp, local_err); | |
1256 | ret = -EINVAL; | |
1257 | goto fail_opts; | |
1258 | } | |
1259 | ||
9b7e8691 AG |
1260 | update_flags_from_options(&bs->open_flags, opts); |
1261 | ||
62392ebb KW |
1262 | driver_name = qemu_opt_get(opts, "driver"); |
1263 | drv = bdrv_find_format(driver_name); | |
1264 | assert(drv != NULL); | |
1265 | ||
5a9347c6 FZ |
1266 | bs->force_share = qemu_opt_get_bool(opts, BDRV_OPT_FORCE_SHARE, false); |
1267 | ||
1268 | if (bs->force_share && (bs->open_flags & BDRV_O_RDWR)) { | |
1269 | error_setg(errp, | |
1270 | BDRV_OPT_FORCE_SHARE | |
1271 | "=on can only be used with read-only images"); | |
1272 | ret = -EINVAL; | |
1273 | goto fail_opts; | |
1274 | } | |
1275 | ||
45673671 | 1276 | if (file != NULL) { |
5696c6e3 | 1277 | filename = blk_bs(file)->filename; |
45673671 | 1278 | } else { |
129c7d1c MA |
1279 | /* |
1280 | * Caution: while qdict_get_try_str() is fine, getting | |
1281 | * non-string types would require more care. When @options | |
1282 | * come from -blockdev or blockdev_add, its members are typed | |
1283 | * according to the QAPI schema, but when they come from | |
1284 | * -drive, they're all QString. | |
1285 | */ | |
45673671 KW |
1286 | filename = qdict_get_try_str(options, "filename"); |
1287 | } | |
1288 | ||
4a008240 | 1289 | if (drv->bdrv_needs_filename && (!filename || !filename[0])) { |
765003db KW |
1290 | error_setg(errp, "The '%s' block driver requires a file name", |
1291 | drv->format_name); | |
18edf289 KW |
1292 | ret = -EINVAL; |
1293 | goto fail_opts; | |
6913c0c2 | 1294 | } |
6913c0c2 | 1295 | |
82dc8b41 KW |
1296 | trace_bdrv_open_common(bs, filename ?: "", bs->open_flags, |
1297 | drv->format_name); | |
62392ebb | 1298 | |
82dc8b41 | 1299 | bs->read_only = !(bs->open_flags & BDRV_O_RDWR); |
b64ec4e4 FZ |
1300 | |
1301 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
1302 | error_setg(errp, |
1303 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
1304 | ? "Driver '%s' can only be used for read-only devices" | |
1305 | : "Driver '%s' is not whitelisted", | |
1306 | drv->format_name); | |
18edf289 KW |
1307 | ret = -ENOTSUP; |
1308 | goto fail_opts; | |
b64ec4e4 | 1309 | } |
57915332 | 1310 | |
d3faa13e PB |
1311 | /* bdrv_new() and bdrv_close() make it so */ |
1312 | assert(atomic_read(&bs->copy_on_read) == 0); | |
1313 | ||
82dc8b41 | 1314 | if (bs->open_flags & BDRV_O_COPY_ON_READ) { |
0ebd24e0 KW |
1315 | if (!bs->read_only) { |
1316 | bdrv_enable_copy_on_read(bs); | |
1317 | } else { | |
1318 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
18edf289 KW |
1319 | ret = -EINVAL; |
1320 | goto fail_opts; | |
0ebd24e0 | 1321 | } |
53fec9d3 SH |
1322 | } |
1323 | ||
818584a4 KW |
1324 | discard = qemu_opt_get(opts, "discard"); |
1325 | if (discard != NULL) { | |
1326 | if (bdrv_parse_discard_flags(discard, &bs->open_flags) != 0) { | |
1327 | error_setg(errp, "Invalid discard option"); | |
1328 | ret = -EINVAL; | |
1329 | goto fail_opts; | |
1330 | } | |
1331 | } | |
1332 | ||
692e01a2 KW |
1333 | detect_zeroes = qemu_opt_get(opts, "detect-zeroes"); |
1334 | if (detect_zeroes) { | |
1335 | BlockdevDetectZeroesOptions value = | |
1336 | qapi_enum_parse(BlockdevDetectZeroesOptions_lookup, | |
1337 | detect_zeroes, | |
692e01a2 KW |
1338 | BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF, |
1339 | &local_err); | |
1340 | if (local_err) { | |
1341 | error_propagate(errp, local_err); | |
1342 | ret = -EINVAL; | |
1343 | goto fail_opts; | |
1344 | } | |
1345 | ||
1346 | if (value == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP && | |
1347 | !(bs->open_flags & BDRV_O_UNMAP)) | |
1348 | { | |
1349 | error_setg(errp, "setting detect-zeroes to unmap is not allowed " | |
1350 | "without setting discard operation to unmap"); | |
1351 | ret = -EINVAL; | |
1352 | goto fail_opts; | |
1353 | } | |
1354 | ||
1355 | bs->detect_zeroes = value; | |
1356 | } | |
1357 | ||
c2ad1b0c KW |
1358 | if (filename != NULL) { |
1359 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
1360 | } else { | |
1361 | bs->filename[0] = '\0'; | |
1362 | } | |
91af7014 | 1363 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
57915332 | 1364 | |
66f82cee | 1365 | /* Open the image, either directly or using a protocol */ |
82dc8b41 | 1366 | open_flags = bdrv_open_flags(bs, bs->open_flags); |
01a56501 | 1367 | node_name = qemu_opt_get(opts, "node-name"); |
57915332 | 1368 | |
01a56501 KW |
1369 | assert(!drv->bdrv_file_open || file == NULL); |
1370 | ret = bdrv_open_driver(bs, drv, node_name, options, open_flags, errp); | |
51762288 | 1371 | if (ret < 0) { |
01a56501 | 1372 | goto fail_opts; |
3baca891 KW |
1373 | } |
1374 | ||
18edf289 | 1375 | qemu_opts_del(opts); |
57915332 KW |
1376 | return 0; |
1377 | ||
18edf289 KW |
1378 | fail_opts: |
1379 | qemu_opts_del(opts); | |
57915332 KW |
1380 | return ret; |
1381 | } | |
1382 | ||
5e5c4f63 KW |
1383 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1384 | { | |
1385 | QObject *options_obj; | |
1386 | QDict *options; | |
1387 | int ret; | |
1388 | ||
1389 | ret = strstart(filename, "json:", &filename); | |
1390 | assert(ret); | |
1391 | ||
5577fff7 | 1392 | options_obj = qobject_from_json(filename, errp); |
5e5c4f63 | 1393 | if (!options_obj) { |
5577fff7 MA |
1394 | /* Work around qobject_from_json() lossage TODO fix that */ |
1395 | if (errp && !*errp) { | |
1396 | error_setg(errp, "Could not parse the JSON options"); | |
1397 | return NULL; | |
1398 | } | |
1399 | error_prepend(errp, "Could not parse the JSON options: "); | |
5e5c4f63 KW |
1400 | return NULL; |
1401 | } | |
1402 | ||
ca6b6e1e MA |
1403 | options = qobject_to_qdict(options_obj); |
1404 | if (!options) { | |
5e5c4f63 KW |
1405 | qobject_decref(options_obj); |
1406 | error_setg(errp, "Invalid JSON object given"); | |
1407 | return NULL; | |
1408 | } | |
1409 | ||
5e5c4f63 KW |
1410 | qdict_flatten(options); |
1411 | ||
1412 | return options; | |
1413 | } | |
1414 | ||
de3b53f0 KW |
1415 | static void parse_json_protocol(QDict *options, const char **pfilename, |
1416 | Error **errp) | |
1417 | { | |
1418 | QDict *json_options; | |
1419 | Error *local_err = NULL; | |
1420 | ||
1421 | /* Parse json: pseudo-protocol */ | |
1422 | if (!*pfilename || !g_str_has_prefix(*pfilename, "json:")) { | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | json_options = parse_json_filename(*pfilename, &local_err); | |
1427 | if (local_err) { | |
1428 | error_propagate(errp, local_err); | |
1429 | return; | |
1430 | } | |
1431 | ||
1432 | /* Options given in the filename have lower priority than options | |
1433 | * specified directly */ | |
1434 | qdict_join(options, json_options, false); | |
1435 | QDECREF(json_options); | |
1436 | *pfilename = NULL; | |
1437 | } | |
1438 | ||
b6ce07aa | 1439 | /* |
f54120ff KW |
1440 | * Fills in default options for opening images and converts the legacy |
1441 | * filename/flags pair to option QDict entries. | |
53a29513 HR |
1442 | * The BDRV_O_PROTOCOL flag in *flags will be set or cleared accordingly if a |
1443 | * block driver has been specified explicitly. | |
b6ce07aa | 1444 | */ |
de3b53f0 | 1445 | static int bdrv_fill_options(QDict **options, const char *filename, |
053e1578 | 1446 | int *flags, Error **errp) |
ea2384d3 | 1447 | { |
c2ad1b0c | 1448 | const char *drvname; |
53a29513 | 1449 | bool protocol = *flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 1450 | bool parse_filename = false; |
053e1578 | 1451 | BlockDriver *drv = NULL; |
34b5d2c6 | 1452 | Error *local_err = NULL; |
83f64091 | 1453 | |
129c7d1c MA |
1454 | /* |
1455 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
1456 | * types would require more care. When @options come from | |
1457 | * -blockdev or blockdev_add, its members are typed according to | |
1458 | * the QAPI schema, but when they come from -drive, they're all | |
1459 | * QString. | |
1460 | */ | |
53a29513 | 1461 | drvname = qdict_get_try_str(*options, "driver"); |
053e1578 HR |
1462 | if (drvname) { |
1463 | drv = bdrv_find_format(drvname); | |
1464 | if (!drv) { | |
1465 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1466 | return -ENOENT; | |
1467 | } | |
1468 | /* If the user has explicitly specified the driver, this choice should | |
1469 | * override the BDRV_O_PROTOCOL flag */ | |
1470 | protocol = drv->bdrv_file_open; | |
53a29513 HR |
1471 | } |
1472 | ||
1473 | if (protocol) { | |
1474 | *flags |= BDRV_O_PROTOCOL; | |
1475 | } else { | |
1476 | *flags &= ~BDRV_O_PROTOCOL; | |
1477 | } | |
1478 | ||
91a097e7 KW |
1479 | /* Translate cache options from flags into options */ |
1480 | update_options_from_flags(*options, *flags); | |
1481 | ||
035fccdf | 1482 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 1483 | if (protocol && filename) { |
f54120ff | 1484 | if (!qdict_haskey(*options, "filename")) { |
46f5ac20 | 1485 | qdict_put_str(*options, "filename", filename); |
f54120ff KW |
1486 | parse_filename = true; |
1487 | } else { | |
1488 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
1489 | "the same time"); | |
1490 | return -EINVAL; | |
1491 | } | |
035fccdf KW |
1492 | } |
1493 | ||
c2ad1b0c | 1494 | /* Find the right block driver */ |
129c7d1c | 1495 | /* See cautionary note on accessing @options above */ |
f54120ff | 1496 | filename = qdict_get_try_str(*options, "filename"); |
f54120ff | 1497 | |
053e1578 HR |
1498 | if (!drvname && protocol) { |
1499 | if (filename) { | |
1500 | drv = bdrv_find_protocol(filename, parse_filename, errp); | |
17b005f1 | 1501 | if (!drv) { |
053e1578 | 1502 | return -EINVAL; |
17b005f1 | 1503 | } |
053e1578 HR |
1504 | |
1505 | drvname = drv->format_name; | |
46f5ac20 | 1506 | qdict_put_str(*options, "driver", drvname); |
053e1578 HR |
1507 | } else { |
1508 | error_setg(errp, "Must specify either driver or file"); | |
1509 | return -EINVAL; | |
98289620 | 1510 | } |
c2ad1b0c KW |
1511 | } |
1512 | ||
17b005f1 | 1513 | assert(drv || !protocol); |
c2ad1b0c | 1514 | |
f54120ff | 1515 | /* Driver-specific filename parsing */ |
17b005f1 | 1516 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1517 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1518 | if (local_err) { |
34b5d2c6 | 1519 | error_propagate(errp, local_err); |
f54120ff | 1520 | return -EINVAL; |
6963a30d | 1521 | } |
cd5d031e HR |
1522 | |
1523 | if (!drv->bdrv_needs_filename) { | |
1524 | qdict_del(*options, "filename"); | |
cd5d031e | 1525 | } |
6963a30d KW |
1526 | } |
1527 | ||
f54120ff KW |
1528 | return 0; |
1529 | } | |
1530 | ||
c1cef672 FZ |
1531 | static int bdrv_child_check_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
1532 | GSList *ignore_children, Error **errp); | |
1533 | static void bdrv_child_abort_perm_update(BdrvChild *c); | |
1534 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared); | |
1535 | ||
ffd1a5a2 FZ |
1536 | static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs, |
1537 | BdrvChild *c, | |
1538 | const BdrvChildRole *role, | |
1539 | uint64_t parent_perm, uint64_t parent_shared, | |
1540 | uint64_t *nperm, uint64_t *nshared) | |
1541 | { | |
1542 | if (bs->drv && bs->drv->bdrv_child_perm) { | |
1543 | bs->drv->bdrv_child_perm(bs, c, role, | |
1544 | parent_perm, parent_shared, | |
1545 | nperm, nshared); | |
1546 | } | |
1547 | if (child_bs && child_bs->force_share) { | |
1548 | *nshared = BLK_PERM_ALL; | |
1549 | } | |
1550 | } | |
1551 | ||
33a610c3 KW |
1552 | /* |
1553 | * Check whether permissions on this node can be changed in a way that | |
1554 | * @cumulative_perms and @cumulative_shared_perms are the new cumulative | |
1555 | * permissions of all its parents. This involves checking whether all necessary | |
1556 | * permission changes to child nodes can be performed. | |
1557 | * | |
1558 | * A call to this function must always be followed by a call to bdrv_set_perm() | |
1559 | * or bdrv_abort_perm_update(). | |
1560 | */ | |
1561 | static int bdrv_check_perm(BlockDriverState *bs, uint64_t cumulative_perms, | |
46181129 KW |
1562 | uint64_t cumulative_shared_perms, |
1563 | GSList *ignore_children, Error **errp) | |
33a610c3 KW |
1564 | { |
1565 | BlockDriver *drv = bs->drv; | |
1566 | BdrvChild *c; | |
1567 | int ret; | |
1568 | ||
1569 | /* Write permissions never work with read-only images */ | |
1570 | if ((cumulative_perms & (BLK_PERM_WRITE | BLK_PERM_WRITE_UNCHANGED)) && | |
9c5e6594 | 1571 | !bdrv_is_writable(bs)) |
33a610c3 KW |
1572 | { |
1573 | error_setg(errp, "Block node is read-only"); | |
1574 | return -EPERM; | |
1575 | } | |
1576 | ||
1577 | /* Check this node */ | |
1578 | if (!drv) { | |
1579 | return 0; | |
1580 | } | |
1581 | ||
1582 | if (drv->bdrv_check_perm) { | |
1583 | return drv->bdrv_check_perm(bs, cumulative_perms, | |
1584 | cumulative_shared_perms, errp); | |
1585 | } | |
1586 | ||
78e421c9 | 1587 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
33a610c3 | 1588 | if (!drv->bdrv_child_perm) { |
78e421c9 | 1589 | assert(QLIST_EMPTY(&bs->children)); |
33a610c3 KW |
1590 | return 0; |
1591 | } | |
1592 | ||
1593 | /* Check all children */ | |
1594 | QLIST_FOREACH(c, &bs->children, next) { | |
1595 | uint64_t cur_perm, cur_shared; | |
ffd1a5a2 FZ |
1596 | bdrv_child_perm(bs, c->bs, c, c->role, |
1597 | cumulative_perms, cumulative_shared_perms, | |
1598 | &cur_perm, &cur_shared); | |
46181129 KW |
1599 | ret = bdrv_child_check_perm(c, cur_perm, cur_shared, ignore_children, |
1600 | errp); | |
33a610c3 KW |
1601 | if (ret < 0) { |
1602 | return ret; | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Notifies drivers that after a previous bdrv_check_perm() call, the | |
1611 | * permission update is not performed and any preparations made for it (e.g. | |
1612 | * taken file locks) need to be undone. | |
1613 | * | |
1614 | * This function recursively notifies all child nodes. | |
1615 | */ | |
1616 | static void bdrv_abort_perm_update(BlockDriverState *bs) | |
1617 | { | |
1618 | BlockDriver *drv = bs->drv; | |
1619 | BdrvChild *c; | |
1620 | ||
1621 | if (!drv) { | |
1622 | return; | |
1623 | } | |
1624 | ||
1625 | if (drv->bdrv_abort_perm_update) { | |
1626 | drv->bdrv_abort_perm_update(bs); | |
1627 | } | |
1628 | ||
1629 | QLIST_FOREACH(c, &bs->children, next) { | |
1630 | bdrv_child_abort_perm_update(c); | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | static void bdrv_set_perm(BlockDriverState *bs, uint64_t cumulative_perms, | |
1635 | uint64_t cumulative_shared_perms) | |
1636 | { | |
1637 | BlockDriver *drv = bs->drv; | |
1638 | BdrvChild *c; | |
1639 | ||
1640 | if (!drv) { | |
1641 | return; | |
1642 | } | |
1643 | ||
1644 | /* Update this node */ | |
1645 | if (drv->bdrv_set_perm) { | |
1646 | drv->bdrv_set_perm(bs, cumulative_perms, cumulative_shared_perms); | |
1647 | } | |
1648 | ||
78e421c9 | 1649 | /* Drivers that never have children can omit .bdrv_child_perm() */ |
33a610c3 | 1650 | if (!drv->bdrv_child_perm) { |
78e421c9 | 1651 | assert(QLIST_EMPTY(&bs->children)); |
33a610c3 KW |
1652 | return; |
1653 | } | |
1654 | ||
1655 | /* Update all children */ | |
1656 | QLIST_FOREACH(c, &bs->children, next) { | |
1657 | uint64_t cur_perm, cur_shared; | |
ffd1a5a2 FZ |
1658 | bdrv_child_perm(bs, c->bs, c, c->role, |
1659 | cumulative_perms, cumulative_shared_perms, | |
1660 | &cur_perm, &cur_shared); | |
33a610c3 KW |
1661 | bdrv_child_set_perm(c, cur_perm, cur_shared); |
1662 | } | |
1663 | } | |
1664 | ||
1665 | static void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm, | |
1666 | uint64_t *shared_perm) | |
1667 | { | |
1668 | BdrvChild *c; | |
1669 | uint64_t cumulative_perms = 0; | |
1670 | uint64_t cumulative_shared_perms = BLK_PERM_ALL; | |
1671 | ||
1672 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
1673 | cumulative_perms |= c->perm; | |
1674 | cumulative_shared_perms &= c->shared_perm; | |
1675 | } | |
1676 | ||
1677 | *perm = cumulative_perms; | |
1678 | *shared_perm = cumulative_shared_perms; | |
1679 | } | |
1680 | ||
d083319f KW |
1681 | static char *bdrv_child_user_desc(BdrvChild *c) |
1682 | { | |
1683 | if (c->role->get_parent_desc) { | |
1684 | return c->role->get_parent_desc(c); | |
1685 | } | |
1686 | ||
1687 | return g_strdup("another user"); | |
1688 | } | |
1689 | ||
5176196c | 1690 | char *bdrv_perm_names(uint64_t perm) |
d083319f KW |
1691 | { |
1692 | struct perm_name { | |
1693 | uint64_t perm; | |
1694 | const char *name; | |
1695 | } permissions[] = { | |
1696 | { BLK_PERM_CONSISTENT_READ, "consistent read" }, | |
1697 | { BLK_PERM_WRITE, "write" }, | |
1698 | { BLK_PERM_WRITE_UNCHANGED, "write unchanged" }, | |
1699 | { BLK_PERM_RESIZE, "resize" }, | |
1700 | { BLK_PERM_GRAPH_MOD, "change children" }, | |
1701 | { 0, NULL } | |
1702 | }; | |
1703 | ||
1704 | char *result = g_strdup(""); | |
1705 | struct perm_name *p; | |
1706 | ||
1707 | for (p = permissions; p->name; p++) { | |
1708 | if (perm & p->perm) { | |
1709 | char *old = result; | |
1710 | result = g_strdup_printf("%s%s%s", old, *old ? ", " : "", p->name); | |
1711 | g_free(old); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | return result; | |
1716 | } | |
1717 | ||
33a610c3 KW |
1718 | /* |
1719 | * Checks whether a new reference to @bs can be added if the new user requires | |
46181129 KW |
1720 | * @new_used_perm/@new_shared_perm as its permissions. If @ignore_children is |
1721 | * set, the BdrvChild objects in this list are ignored in the calculations; | |
1722 | * this allows checking permission updates for an existing reference. | |
33a610c3 KW |
1723 | * |
1724 | * Needs to be followed by a call to either bdrv_set_perm() or | |
1725 | * bdrv_abort_perm_update(). */ | |
d5e6f437 KW |
1726 | static int bdrv_check_update_perm(BlockDriverState *bs, uint64_t new_used_perm, |
1727 | uint64_t new_shared_perm, | |
46181129 | 1728 | GSList *ignore_children, Error **errp) |
d5e6f437 KW |
1729 | { |
1730 | BdrvChild *c; | |
33a610c3 KW |
1731 | uint64_t cumulative_perms = new_used_perm; |
1732 | uint64_t cumulative_shared_perms = new_shared_perm; | |
d5e6f437 KW |
1733 | |
1734 | /* There is no reason why anyone couldn't tolerate write_unchanged */ | |
1735 | assert(new_shared_perm & BLK_PERM_WRITE_UNCHANGED); | |
1736 | ||
1737 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
46181129 | 1738 | if (g_slist_find(ignore_children, c)) { |
d5e6f437 KW |
1739 | continue; |
1740 | } | |
1741 | ||
d083319f KW |
1742 | if ((new_used_perm & c->shared_perm) != new_used_perm) { |
1743 | char *user = bdrv_child_user_desc(c); | |
1744 | char *perm_names = bdrv_perm_names(new_used_perm & ~c->shared_perm); | |
1745 | error_setg(errp, "Conflicts with use by %s as '%s', which does not " | |
1746 | "allow '%s' on %s", | |
1747 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); | |
1748 | g_free(user); | |
1749 | g_free(perm_names); | |
1750 | return -EPERM; | |
1751 | } | |
1752 | ||
1753 | if ((c->perm & new_shared_perm) != c->perm) { | |
1754 | char *user = bdrv_child_user_desc(c); | |
1755 | char *perm_names = bdrv_perm_names(c->perm & ~new_shared_perm); | |
1756 | error_setg(errp, "Conflicts with use by %s as '%s', which uses " | |
1757 | "'%s' on %s", | |
1758 | user, c->name, perm_names, bdrv_get_node_name(c->bs)); | |
1759 | g_free(user); | |
1760 | g_free(perm_names); | |
d5e6f437 KW |
1761 | return -EPERM; |
1762 | } | |
33a610c3 KW |
1763 | |
1764 | cumulative_perms |= c->perm; | |
1765 | cumulative_shared_perms &= c->shared_perm; | |
d5e6f437 KW |
1766 | } |
1767 | ||
46181129 KW |
1768 | return bdrv_check_perm(bs, cumulative_perms, cumulative_shared_perms, |
1769 | ignore_children, errp); | |
33a610c3 KW |
1770 | } |
1771 | ||
1772 | /* Needs to be followed by a call to either bdrv_child_set_perm() or | |
1773 | * bdrv_child_abort_perm_update(). */ | |
c1cef672 FZ |
1774 | static int bdrv_child_check_perm(BdrvChild *c, uint64_t perm, uint64_t shared, |
1775 | GSList *ignore_children, Error **errp) | |
33a610c3 | 1776 | { |
46181129 KW |
1777 | int ret; |
1778 | ||
1779 | ignore_children = g_slist_prepend(g_slist_copy(ignore_children), c); | |
1780 | ret = bdrv_check_update_perm(c->bs, perm, shared, ignore_children, errp); | |
1781 | g_slist_free(ignore_children); | |
1782 | ||
1783 | return ret; | |
33a610c3 KW |
1784 | } |
1785 | ||
c1cef672 | 1786 | static void bdrv_child_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared) |
33a610c3 KW |
1787 | { |
1788 | uint64_t cumulative_perms, cumulative_shared_perms; | |
1789 | ||
1790 | c->perm = perm; | |
1791 | c->shared_perm = shared; | |
1792 | ||
1793 | bdrv_get_cumulative_perm(c->bs, &cumulative_perms, | |
1794 | &cumulative_shared_perms); | |
1795 | bdrv_set_perm(c->bs, cumulative_perms, cumulative_shared_perms); | |
1796 | } | |
1797 | ||
c1cef672 | 1798 | static void bdrv_child_abort_perm_update(BdrvChild *c) |
33a610c3 KW |
1799 | { |
1800 | bdrv_abort_perm_update(c->bs); | |
1801 | } | |
1802 | ||
1803 | int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, | |
1804 | Error **errp) | |
1805 | { | |
1806 | int ret; | |
1807 | ||
46181129 | 1808 | ret = bdrv_child_check_perm(c, perm, shared, NULL, errp); |
33a610c3 KW |
1809 | if (ret < 0) { |
1810 | bdrv_child_abort_perm_update(c); | |
1811 | return ret; | |
1812 | } | |
1813 | ||
1814 | bdrv_child_set_perm(c, perm, shared); | |
1815 | ||
d5e6f437 KW |
1816 | return 0; |
1817 | } | |
1818 | ||
6a1b9ee1 KW |
1819 | #define DEFAULT_PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \ |
1820 | | BLK_PERM_WRITE \ | |
1821 | | BLK_PERM_WRITE_UNCHANGED \ | |
1822 | | BLK_PERM_RESIZE) | |
1823 | #define DEFAULT_PERM_UNCHANGED (BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH) | |
1824 | ||
1825 | void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, | |
1826 | const BdrvChildRole *role, | |
1827 | uint64_t perm, uint64_t shared, | |
1828 | uint64_t *nperm, uint64_t *nshared) | |
1829 | { | |
1830 | if (c == NULL) { | |
1831 | *nperm = perm & DEFAULT_PERM_PASSTHROUGH; | |
1832 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED; | |
1833 | return; | |
1834 | } | |
1835 | ||
1836 | *nperm = (perm & DEFAULT_PERM_PASSTHROUGH) | | |
1837 | (c->perm & DEFAULT_PERM_UNCHANGED); | |
1838 | *nshared = (shared & DEFAULT_PERM_PASSTHROUGH) | | |
1839 | (c->shared_perm & DEFAULT_PERM_UNCHANGED); | |
1840 | } | |
1841 | ||
6b1a044a KW |
1842 | void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, |
1843 | const BdrvChildRole *role, | |
1844 | uint64_t perm, uint64_t shared, | |
1845 | uint64_t *nperm, uint64_t *nshared) | |
1846 | { | |
1847 | bool backing = (role == &child_backing); | |
1848 | assert(role == &child_backing || role == &child_file); | |
1849 | ||
1850 | if (!backing) { | |
1851 | /* Apart from the modifications below, the same permissions are | |
1852 | * forwarded and left alone as for filters */ | |
1853 | bdrv_filter_default_perms(bs, c, role, perm, shared, &perm, &shared); | |
1854 | ||
1855 | /* Format drivers may touch metadata even if the guest doesn't write */ | |
9c5e6594 | 1856 | if (bdrv_is_writable(bs)) { |
6b1a044a KW |
1857 | perm |= BLK_PERM_WRITE | BLK_PERM_RESIZE; |
1858 | } | |
1859 | ||
1860 | /* bs->file always needs to be consistent because of the metadata. We | |
1861 | * can never allow other users to resize or write to it. */ | |
1862 | perm |= BLK_PERM_CONSISTENT_READ; | |
1863 | shared &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
1864 | } else { | |
1865 | /* We want consistent read from backing files if the parent needs it. | |
1866 | * No other operations are performed on backing files. */ | |
1867 | perm &= BLK_PERM_CONSISTENT_READ; | |
1868 | ||
1869 | /* If the parent can deal with changing data, we're okay with a | |
1870 | * writable and resizable backing file. */ | |
1871 | /* TODO Require !(perm & BLK_PERM_CONSISTENT_READ), too? */ | |
1872 | if (shared & BLK_PERM_WRITE) { | |
1873 | shared = BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
1874 | } else { | |
1875 | shared = 0; | |
1876 | } | |
1877 | ||
1878 | shared |= BLK_PERM_CONSISTENT_READ | BLK_PERM_GRAPH_MOD | | |
1879 | BLK_PERM_WRITE_UNCHANGED; | |
1880 | } | |
1881 | ||
9c5e6594 KW |
1882 | if (bs->open_flags & BDRV_O_INACTIVE) { |
1883 | shared |= BLK_PERM_WRITE | BLK_PERM_RESIZE; | |
1884 | } | |
1885 | ||
6b1a044a KW |
1886 | *nperm = perm; |
1887 | *nshared = shared; | |
1888 | } | |
1889 | ||
8ee03995 KW |
1890 | static void bdrv_replace_child_noperm(BdrvChild *child, |
1891 | BlockDriverState *new_bs) | |
e9740bc6 KW |
1892 | { |
1893 | BlockDriverState *old_bs = child->bs; | |
1894 | ||
bb2614e9 FZ |
1895 | if (old_bs && new_bs) { |
1896 | assert(bdrv_get_aio_context(old_bs) == bdrv_get_aio_context(new_bs)); | |
1897 | } | |
e9740bc6 | 1898 | if (old_bs) { |
36fe1331 KW |
1899 | if (old_bs->quiesce_counter && child->role->drained_end) { |
1900 | child->role->drained_end(child); | |
1901 | } | |
db95dbba KW |
1902 | if (child->role->detach) { |
1903 | child->role->detach(child); | |
1904 | } | |
e9740bc6 KW |
1905 | QLIST_REMOVE(child, next_parent); |
1906 | } | |
36fe1331 KW |
1907 | |
1908 | child->bs = new_bs; | |
1909 | ||
e9740bc6 KW |
1910 | if (new_bs) { |
1911 | QLIST_INSERT_HEAD(&new_bs->parents, child, next_parent); | |
36fe1331 KW |
1912 | if (new_bs->quiesce_counter && child->role->drained_begin) { |
1913 | child->role->drained_begin(child); | |
1914 | } | |
33a610c3 | 1915 | |
8ee03995 KW |
1916 | if (child->role->attach) { |
1917 | child->role->attach(child); | |
1918 | } | |
1919 | } | |
1920 | } | |
33a610c3 | 1921 | |
466787fb KW |
1922 | /* |
1923 | * Updates @child to change its reference to point to @new_bs, including | |
1924 | * checking and applying the necessary permisson updates both to the old node | |
1925 | * and to @new_bs. | |
1926 | * | |
1927 | * NULL is passed as @new_bs for removing the reference before freeing @child. | |
1928 | * | |
1929 | * If @new_bs is not NULL, bdrv_check_perm() must be called beforehand, as this | |
1930 | * function uses bdrv_set_perm() to update the permissions according to the new | |
1931 | * reference that @new_bs gets. | |
1932 | */ | |
1933 | static void bdrv_replace_child(BdrvChild *child, BlockDriverState *new_bs) | |
8ee03995 KW |
1934 | { |
1935 | BlockDriverState *old_bs = child->bs; | |
1936 | uint64_t perm, shared_perm; | |
1937 | ||
8aecf1d1 KW |
1938 | bdrv_replace_child_noperm(child, new_bs); |
1939 | ||
8ee03995 | 1940 | if (old_bs) { |
33a610c3 KW |
1941 | /* Update permissions for old node. This is guaranteed to succeed |
1942 | * because we're just taking a parent away, so we're loosening | |
1943 | * restrictions. */ | |
1944 | bdrv_get_cumulative_perm(old_bs, &perm, &shared_perm); | |
46181129 | 1945 | bdrv_check_perm(old_bs, perm, shared_perm, NULL, &error_abort); |
33a610c3 | 1946 | bdrv_set_perm(old_bs, perm, shared_perm); |
e9740bc6 | 1947 | } |
36fe1331 | 1948 | |
e9740bc6 | 1949 | if (new_bs) { |
33a610c3 | 1950 | bdrv_get_cumulative_perm(new_bs, &perm, &shared_perm); |
33a610c3 | 1951 | bdrv_set_perm(new_bs, perm, shared_perm); |
e9740bc6 | 1952 | } |
e9740bc6 KW |
1953 | } |
1954 | ||
f21d96d0 KW |
1955 | BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, |
1956 | const char *child_name, | |
36fe1331 | 1957 | const BdrvChildRole *child_role, |
d5e6f437 KW |
1958 | uint64_t perm, uint64_t shared_perm, |
1959 | void *opaque, Error **errp) | |
df581792 | 1960 | { |
d5e6f437 KW |
1961 | BdrvChild *child; |
1962 | int ret; | |
1963 | ||
1964 | ret = bdrv_check_update_perm(child_bs, perm, shared_perm, NULL, errp); | |
1965 | if (ret < 0) { | |
33a610c3 | 1966 | bdrv_abort_perm_update(child_bs); |
d5e6f437 KW |
1967 | return NULL; |
1968 | } | |
1969 | ||
1970 | child = g_new(BdrvChild, 1); | |
df581792 | 1971 | *child = (BdrvChild) { |
d5e6f437 KW |
1972 | .bs = NULL, |
1973 | .name = g_strdup(child_name), | |
1974 | .role = child_role, | |
1975 | .perm = perm, | |
1976 | .shared_perm = shared_perm, | |
1977 | .opaque = opaque, | |
df581792 KW |
1978 | }; |
1979 | ||
33a610c3 | 1980 | /* This performs the matching bdrv_set_perm() for the above check. */ |
466787fb | 1981 | bdrv_replace_child(child, child_bs); |
b4b059f6 KW |
1982 | |
1983 | return child; | |
df581792 KW |
1984 | } |
1985 | ||
98292c61 WC |
1986 | BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, |
1987 | BlockDriverState *child_bs, | |
1988 | const char *child_name, | |
8b2ff529 KW |
1989 | const BdrvChildRole *child_role, |
1990 | Error **errp) | |
f21d96d0 | 1991 | { |
d5e6f437 | 1992 | BdrvChild *child; |
f68c598b KW |
1993 | uint64_t perm, shared_perm; |
1994 | ||
1995 | bdrv_get_cumulative_perm(parent_bs, &perm, &shared_perm); | |
1996 | ||
1997 | assert(parent_bs->drv); | |
bb2614e9 | 1998 | assert(bdrv_get_aio_context(parent_bs) == bdrv_get_aio_context(child_bs)); |
ffd1a5a2 FZ |
1999 | bdrv_child_perm(parent_bs, child_bs, NULL, child_role, |
2000 | perm, shared_perm, &perm, &shared_perm); | |
d5e6f437 | 2001 | |
d5e6f437 | 2002 | child = bdrv_root_attach_child(child_bs, child_name, child_role, |
f68c598b | 2003 | perm, shared_perm, parent_bs, errp); |
d5e6f437 KW |
2004 | if (child == NULL) { |
2005 | return NULL; | |
2006 | } | |
2007 | ||
f21d96d0 KW |
2008 | QLIST_INSERT_HEAD(&parent_bs->children, child, next); |
2009 | return child; | |
2010 | } | |
2011 | ||
3f09bfbc | 2012 | static void bdrv_detach_child(BdrvChild *child) |
33a60407 | 2013 | { |
f21d96d0 KW |
2014 | if (child->next.le_prev) { |
2015 | QLIST_REMOVE(child, next); | |
2016 | child->next.le_prev = NULL; | |
2017 | } | |
e9740bc6 | 2018 | |
466787fb | 2019 | bdrv_replace_child(child, NULL); |
e9740bc6 | 2020 | |
260fecf1 | 2021 | g_free(child->name); |
33a60407 KW |
2022 | g_free(child); |
2023 | } | |
2024 | ||
f21d96d0 | 2025 | void bdrv_root_unref_child(BdrvChild *child) |
33a60407 | 2026 | { |
779020cb KW |
2027 | BlockDriverState *child_bs; |
2028 | ||
f21d96d0 KW |
2029 | child_bs = child->bs; |
2030 | bdrv_detach_child(child); | |
2031 | bdrv_unref(child_bs); | |
2032 | } | |
2033 | ||
2034 | void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child) | |
2035 | { | |
779020cb KW |
2036 | if (child == NULL) { |
2037 | return; | |
2038 | } | |
33a60407 KW |
2039 | |
2040 | if (child->bs->inherits_from == parent) { | |
4e4bf5c4 KW |
2041 | BdrvChild *c; |
2042 | ||
2043 | /* Remove inherits_from only when the last reference between parent and | |
2044 | * child->bs goes away. */ | |
2045 | QLIST_FOREACH(c, &parent->children, next) { | |
2046 | if (c != child && c->bs == child->bs) { | |
2047 | break; | |
2048 | } | |
2049 | } | |
2050 | if (c == NULL) { | |
2051 | child->bs->inherits_from = NULL; | |
2052 | } | |
33a60407 KW |
2053 | } |
2054 | ||
f21d96d0 | 2055 | bdrv_root_unref_child(child); |
33a60407 KW |
2056 | } |
2057 | ||
5c8cab48 KW |
2058 | |
2059 | static void bdrv_parent_cb_change_media(BlockDriverState *bs, bool load) | |
2060 | { | |
2061 | BdrvChild *c; | |
2062 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
2063 | if (c->role->change_media) { | |
2064 | c->role->change_media(c, load); | |
2065 | } | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | static void bdrv_parent_cb_resize(BlockDriverState *bs) | |
2070 | { | |
2071 | BdrvChild *c; | |
2072 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
2073 | if (c->role->resize) { | |
2074 | c->role->resize(c); | |
2075 | } | |
2076 | } | |
2077 | } | |
2078 | ||
5db15a57 KW |
2079 | /* |
2080 | * Sets the backing file link of a BDS. A new reference is created; callers | |
2081 | * which don't need their own reference any more must call bdrv_unref(). | |
2082 | */ | |
12fa4af6 KW |
2083 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, |
2084 | Error **errp) | |
8d24cce1 | 2085 | { |
5db15a57 KW |
2086 | if (backing_hd) { |
2087 | bdrv_ref(backing_hd); | |
2088 | } | |
8d24cce1 | 2089 | |
760e0063 | 2090 | if (bs->backing) { |
5db15a57 | 2091 | bdrv_unref_child(bs, bs->backing); |
826b6ca0 FZ |
2092 | } |
2093 | ||
8d24cce1 | 2094 | if (!backing_hd) { |
760e0063 | 2095 | bs->backing = NULL; |
8d24cce1 FZ |
2096 | goto out; |
2097 | } | |
12fa4af6 | 2098 | |
8b2ff529 | 2099 | bs->backing = bdrv_attach_child(bs, backing_hd, "backing", &child_backing, |
12fa4af6 KW |
2100 | errp); |
2101 | if (!bs->backing) { | |
2102 | bdrv_unref(backing_hd); | |
2103 | } | |
826b6ca0 | 2104 | |
9e7e940c KW |
2105 | bdrv_refresh_filename(bs); |
2106 | ||
8d24cce1 | 2107 | out: |
3baca891 | 2108 | bdrv_refresh_limits(bs, NULL); |
8d24cce1 FZ |
2109 | } |
2110 | ||
31ca6d07 KW |
2111 | /* |
2112 | * Opens the backing file for a BlockDriverState if not yet open | |
2113 | * | |
d9b7b057 KW |
2114 | * bdref_key specifies the key for the image's BlockdevRef in the options QDict. |
2115 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
2116 | * itself, all options starting with "${bdref_key}." are considered part of the | |
2117 | * BlockdevRef. | |
2118 | * | |
2119 | * TODO Can this be unified with bdrv_open_image()? | |
31ca6d07 | 2120 | */ |
d9b7b057 KW |
2121 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, |
2122 | const char *bdref_key, Error **errp) | |
9156df12 | 2123 | { |
1ba4b6a5 | 2124 | char *backing_filename = g_malloc0(PATH_MAX); |
d9b7b057 KW |
2125 | char *bdref_key_dot; |
2126 | const char *reference = NULL; | |
317fc44e | 2127 | int ret = 0; |
8d24cce1 | 2128 | BlockDriverState *backing_hd; |
d9b7b057 KW |
2129 | QDict *options; |
2130 | QDict *tmp_parent_options = NULL; | |
34b5d2c6 | 2131 | Error *local_err = NULL; |
9156df12 | 2132 | |
760e0063 | 2133 | if (bs->backing != NULL) { |
1ba4b6a5 | 2134 | goto free_exit; |
9156df12 PB |
2135 | } |
2136 | ||
31ca6d07 | 2137 | /* NULL means an empty set of options */ |
d9b7b057 KW |
2138 | if (parent_options == NULL) { |
2139 | tmp_parent_options = qdict_new(); | |
2140 | parent_options = tmp_parent_options; | |
31ca6d07 KW |
2141 | } |
2142 | ||
9156df12 | 2143 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
d9b7b057 KW |
2144 | |
2145 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); | |
2146 | qdict_extract_subqdict(parent_options, &options, bdref_key_dot); | |
2147 | g_free(bdref_key_dot); | |
2148 | ||
129c7d1c MA |
2149 | /* |
2150 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
2151 | * types would require more care. When @parent_options come from | |
2152 | * -blockdev or blockdev_add, its members are typed according to | |
2153 | * the QAPI schema, but when they come from -drive, they're all | |
2154 | * QString. | |
2155 | */ | |
d9b7b057 KW |
2156 | reference = qdict_get_try_str(parent_options, bdref_key); |
2157 | if (reference || qdict_haskey(options, "file.filename")) { | |
1cb6f506 KW |
2158 | backing_filename[0] = '\0'; |
2159 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 2160 | QDECREF(options); |
1ba4b6a5 | 2161 | goto free_exit; |
dbecebdd | 2162 | } else { |
9f07429e HR |
2163 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
2164 | &local_err); | |
2165 | if (local_err) { | |
2166 | ret = -EINVAL; | |
2167 | error_propagate(errp, local_err); | |
2168 | QDECREF(options); | |
2169 | goto free_exit; | |
2170 | } | |
9156df12 PB |
2171 | } |
2172 | ||
8ee79e70 KW |
2173 | if (!bs->drv || !bs->drv->supports_backing) { |
2174 | ret = -EINVAL; | |
2175 | error_setg(errp, "Driver doesn't support backing files"); | |
2176 | QDECREF(options); | |
2177 | goto free_exit; | |
2178 | } | |
2179 | ||
c5f6e493 | 2180 | if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
46f5ac20 | 2181 | qdict_put_str(options, "driver", bs->backing_format); |
9156df12 PB |
2182 | } |
2183 | ||
5b363937 HR |
2184 | backing_hd = bdrv_open_inherit(*backing_filename ? backing_filename : NULL, |
2185 | reference, options, 0, bs, &child_backing, | |
2186 | errp); | |
2187 | if (!backing_hd) { | |
9156df12 | 2188 | bs->open_flags |= BDRV_O_NO_BACKING; |
e43bfd9c | 2189 | error_prepend(errp, "Could not open backing file: "); |
5b363937 | 2190 | ret = -EINVAL; |
1ba4b6a5 | 2191 | goto free_exit; |
9156df12 | 2192 | } |
5ce6bfe2 | 2193 | bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs)); |
df581792 | 2194 | |
5db15a57 KW |
2195 | /* Hook up the backing file link; drop our reference, bs owns the |
2196 | * backing_hd reference now */ | |
12fa4af6 | 2197 | bdrv_set_backing_hd(bs, backing_hd, &local_err); |
5db15a57 | 2198 | bdrv_unref(backing_hd); |
12fa4af6 | 2199 | if (local_err) { |
8cd1a3e4 | 2200 | error_propagate(errp, local_err); |
12fa4af6 KW |
2201 | ret = -EINVAL; |
2202 | goto free_exit; | |
2203 | } | |
d80ac658 | 2204 | |
d9b7b057 KW |
2205 | qdict_del(parent_options, bdref_key); |
2206 | ||
1ba4b6a5 BC |
2207 | free_exit: |
2208 | g_free(backing_filename); | |
d9b7b057 | 2209 | QDECREF(tmp_parent_options); |
1ba4b6a5 | 2210 | return ret; |
9156df12 PB |
2211 | } |
2212 | ||
2d6b86af KW |
2213 | static BlockDriverState * |
2214 | bdrv_open_child_bs(const char *filename, QDict *options, const char *bdref_key, | |
2215 | BlockDriverState *parent, const BdrvChildRole *child_role, | |
2216 | bool allow_none, Error **errp) | |
da557aac | 2217 | { |
2d6b86af | 2218 | BlockDriverState *bs = NULL; |
da557aac | 2219 | QDict *image_options; |
da557aac HR |
2220 | char *bdref_key_dot; |
2221 | const char *reference; | |
2222 | ||
df581792 | 2223 | assert(child_role != NULL); |
f67503e5 | 2224 | |
da557aac HR |
2225 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
2226 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
2227 | g_free(bdref_key_dot); | |
2228 | ||
129c7d1c MA |
2229 | /* |
2230 | * Caution: while qdict_get_try_str() is fine, getting non-string | |
2231 | * types would require more care. When @options come from | |
2232 | * -blockdev or blockdev_add, its members are typed according to | |
2233 | * the QAPI schema, but when they come from -drive, they're all | |
2234 | * QString. | |
2235 | */ | |
da557aac HR |
2236 | reference = qdict_get_try_str(options, bdref_key); |
2237 | if (!filename && !reference && !qdict_size(image_options)) { | |
b4b059f6 | 2238 | if (!allow_none) { |
da557aac HR |
2239 | error_setg(errp, "A block device must be specified for \"%s\"", |
2240 | bdref_key); | |
da557aac | 2241 | } |
b20e61e0 | 2242 | QDECREF(image_options); |
da557aac HR |
2243 | goto done; |
2244 | } | |
2245 | ||
5b363937 HR |
2246 | bs = bdrv_open_inherit(filename, reference, image_options, 0, |
2247 | parent, child_role, errp); | |
2248 | if (!bs) { | |
df581792 KW |
2249 | goto done; |
2250 | } | |
2251 | ||
da557aac HR |
2252 | done: |
2253 | qdict_del(options, bdref_key); | |
2d6b86af KW |
2254 | return bs; |
2255 | } | |
2256 | ||
2257 | /* | |
2258 | * Opens a disk image whose options are given as BlockdevRef in another block | |
2259 | * device's options. | |
2260 | * | |
2261 | * If allow_none is true, no image will be opened if filename is false and no | |
2262 | * BlockdevRef is given. NULL will be returned, but errp remains unset. | |
2263 | * | |
2264 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
2265 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
2266 | * itself, all options starting with "${bdref_key}." are considered part of the | |
2267 | * BlockdevRef. | |
2268 | * | |
2269 | * The BlockdevRef will be removed from the options QDict. | |
2270 | */ | |
2271 | BdrvChild *bdrv_open_child(const char *filename, | |
2272 | QDict *options, const char *bdref_key, | |
2273 | BlockDriverState *parent, | |
2274 | const BdrvChildRole *child_role, | |
2275 | bool allow_none, Error **errp) | |
2276 | { | |
8b2ff529 | 2277 | BdrvChild *c; |
2d6b86af KW |
2278 | BlockDriverState *bs; |
2279 | ||
2280 | bs = bdrv_open_child_bs(filename, options, bdref_key, parent, child_role, | |
2281 | allow_none, errp); | |
2282 | if (bs == NULL) { | |
2283 | return NULL; | |
2284 | } | |
2285 | ||
8b2ff529 KW |
2286 | c = bdrv_attach_child(parent, bs, bdref_key, child_role, errp); |
2287 | if (!c) { | |
2288 | bdrv_unref(bs); | |
2289 | return NULL; | |
2290 | } | |
2291 | ||
2292 | return c; | |
b4b059f6 KW |
2293 | } |
2294 | ||
66836189 HR |
2295 | static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, |
2296 | int flags, | |
2297 | QDict *snapshot_options, | |
2298 | Error **errp) | |
b998875d KW |
2299 | { |
2300 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 2301 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d | 2302 | int64_t total_size; |
83d0521a | 2303 | QemuOpts *opts = NULL; |
ff6ed714 | 2304 | BlockDriverState *bs_snapshot = NULL; |
b2c2832c | 2305 | Error *local_err = NULL; |
b998875d KW |
2306 | int ret; |
2307 | ||
2308 | /* if snapshot, we create a temporary backing file and open it | |
2309 | instead of opening 'filename' directly */ | |
2310 | ||
2311 | /* Get the required size from the image */ | |
f187743a KW |
2312 | total_size = bdrv_getlength(bs); |
2313 | if (total_size < 0) { | |
2314 | error_setg_errno(errp, -total_size, "Could not get image size"); | |
1ba4b6a5 | 2315 | goto out; |
f187743a | 2316 | } |
b998875d KW |
2317 | |
2318 | /* Create the temporary image */ | |
1ba4b6a5 | 2319 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
2320 | if (ret < 0) { |
2321 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 2322 | goto out; |
b998875d KW |
2323 | } |
2324 | ||
ef810437 | 2325 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
c282e1fd | 2326 | &error_abort); |
39101f25 | 2327 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
e43bfd9c | 2328 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, errp); |
83d0521a | 2329 | qemu_opts_del(opts); |
b998875d | 2330 | if (ret < 0) { |
e43bfd9c MA |
2331 | error_prepend(errp, "Could not create temporary overlay '%s': ", |
2332 | tmp_filename); | |
1ba4b6a5 | 2333 | goto out; |
b998875d KW |
2334 | } |
2335 | ||
73176bee | 2336 | /* Prepare options QDict for the temporary file */ |
46f5ac20 EB |
2337 | qdict_put_str(snapshot_options, "file.driver", "file"); |
2338 | qdict_put_str(snapshot_options, "file.filename", tmp_filename); | |
2339 | qdict_put_str(snapshot_options, "driver", "qcow2"); | |
b998875d | 2340 | |
5b363937 | 2341 | bs_snapshot = bdrv_open(NULL, NULL, snapshot_options, flags, errp); |
73176bee | 2342 | snapshot_options = NULL; |
5b363937 | 2343 | if (!bs_snapshot) { |
1ba4b6a5 | 2344 | goto out; |
b998875d KW |
2345 | } |
2346 | ||
ff6ed714 EB |
2347 | /* bdrv_append() consumes a strong reference to bs_snapshot |
2348 | * (i.e. it will call bdrv_unref() on it) even on error, so in | |
2349 | * order to be able to return one, we have to increase | |
2350 | * bs_snapshot's refcount here */ | |
66836189 | 2351 | bdrv_ref(bs_snapshot); |
b2c2832c KW |
2352 | bdrv_append(bs_snapshot, bs, &local_err); |
2353 | if (local_err) { | |
2354 | error_propagate(errp, local_err); | |
ff6ed714 | 2355 | bs_snapshot = NULL; |
b2c2832c KW |
2356 | goto out; |
2357 | } | |
1ba4b6a5 BC |
2358 | |
2359 | out: | |
73176bee | 2360 | QDECREF(snapshot_options); |
1ba4b6a5 | 2361 | g_free(tmp_filename); |
ff6ed714 | 2362 | return bs_snapshot; |
b998875d KW |
2363 | } |
2364 | ||
b6ce07aa KW |
2365 | /* |
2366 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
2367 | * |
2368 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
2369 | * empty set of options. The reference to the QDict belongs to the block layer | |
2370 | * after the call (even on failure), so if the caller intends to reuse the | |
2371 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
2372 | * |
2373 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
2374 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
2375 | * |
2376 | * The reference parameter may be used to specify an existing block device which | |
2377 | * should be opened. If specified, neither options nor a filename may be given, | |
2378 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 2379 | */ |
5b363937 HR |
2380 | static BlockDriverState *bdrv_open_inherit(const char *filename, |
2381 | const char *reference, | |
2382 | QDict *options, int flags, | |
2383 | BlockDriverState *parent, | |
2384 | const BdrvChildRole *child_role, | |
2385 | Error **errp) | |
ea2384d3 | 2386 | { |
b6ce07aa | 2387 | int ret; |
5696c6e3 | 2388 | BlockBackend *file = NULL; |
9a4f4c31 | 2389 | BlockDriverState *bs; |
ce343771 | 2390 | BlockDriver *drv = NULL; |
74fe54f2 | 2391 | const char *drvname; |
3e8c2e57 | 2392 | const char *backing; |
34b5d2c6 | 2393 | Error *local_err = NULL; |
73176bee | 2394 | QDict *snapshot_options = NULL; |
b1e6fc08 | 2395 | int snapshot_flags = 0; |
712e7874 | 2396 | |
f3930ed0 KW |
2397 | assert(!child_role || !flags); |
2398 | assert(!child_role == !parent); | |
f67503e5 | 2399 | |
ddf5636d HR |
2400 | if (reference) { |
2401 | bool options_non_empty = options ? qdict_size(options) : false; | |
2402 | QDECREF(options); | |
2403 | ||
ddf5636d HR |
2404 | if (filename || options_non_empty) { |
2405 | error_setg(errp, "Cannot reference an existing block device with " | |
2406 | "additional options or a new filename"); | |
5b363937 | 2407 | return NULL; |
ddf5636d HR |
2408 | } |
2409 | ||
2410 | bs = bdrv_lookup_bs(reference, reference, errp); | |
2411 | if (!bs) { | |
5b363937 | 2412 | return NULL; |
ddf5636d | 2413 | } |
76b22320 | 2414 | |
ddf5636d | 2415 | bdrv_ref(bs); |
5b363937 | 2416 | return bs; |
ddf5636d HR |
2417 | } |
2418 | ||
5b363937 | 2419 | bs = bdrv_new(); |
f67503e5 | 2420 | |
de9c0cec KW |
2421 | /* NULL means an empty set of options */ |
2422 | if (options == NULL) { | |
2423 | options = qdict_new(); | |
2424 | } | |
2425 | ||
145f598e | 2426 | /* json: syntax counts as explicit options, as if in the QDict */ |
de3b53f0 KW |
2427 | parse_json_protocol(options, &filename, &local_err); |
2428 | if (local_err) { | |
de3b53f0 KW |
2429 | goto fail; |
2430 | } | |
2431 | ||
145f598e KW |
2432 | bs->explicit_options = qdict_clone_shallow(options); |
2433 | ||
f3930ed0 | 2434 | if (child_role) { |
bddcec37 | 2435 | bs->inherits_from = parent; |
8e2160e2 KW |
2436 | child_role->inherit_options(&flags, options, |
2437 | parent->open_flags, parent->options); | |
f3930ed0 KW |
2438 | } |
2439 | ||
de3b53f0 | 2440 | ret = bdrv_fill_options(&options, filename, &flags, &local_err); |
462f5bcf KW |
2441 | if (local_err) { |
2442 | goto fail; | |
2443 | } | |
2444 | ||
129c7d1c MA |
2445 | /* |
2446 | * Set the BDRV_O_RDWR and BDRV_O_ALLOW_RDWR flags. | |
2447 | * Caution: getting a boolean member of @options requires care. | |
2448 | * When @options come from -blockdev or blockdev_add, members are | |
2449 | * typed according to the QAPI schema, but when they come from | |
2450 | * -drive, they're all QString. | |
2451 | */ | |
f87a0e29 AG |
2452 | if (g_strcmp0(qdict_get_try_str(options, BDRV_OPT_READ_ONLY), "on") && |
2453 | !qdict_get_try_bool(options, BDRV_OPT_READ_ONLY, false)) { | |
2454 | flags |= (BDRV_O_RDWR | BDRV_O_ALLOW_RDWR); | |
2455 | } else { | |
2456 | flags &= ~BDRV_O_RDWR; | |
14499ea5 AG |
2457 | } |
2458 | ||
2459 | if (flags & BDRV_O_SNAPSHOT) { | |
2460 | snapshot_options = qdict_new(); | |
2461 | bdrv_temp_snapshot_options(&snapshot_flags, snapshot_options, | |
2462 | flags, options); | |
f87a0e29 AG |
2463 | /* Let bdrv_backing_options() override "read-only" */ |
2464 | qdict_del(options, BDRV_OPT_READ_ONLY); | |
14499ea5 AG |
2465 | bdrv_backing_options(&flags, options, flags, options); |
2466 | } | |
2467 | ||
62392ebb KW |
2468 | bs->open_flags = flags; |
2469 | bs->options = options; | |
2470 | options = qdict_clone_shallow(options); | |
2471 | ||
76c591b0 | 2472 | /* Find the right image format driver */ |
129c7d1c | 2473 | /* See cautionary note on accessing @options above */ |
76c591b0 KW |
2474 | drvname = qdict_get_try_str(options, "driver"); |
2475 | if (drvname) { | |
2476 | drv = bdrv_find_format(drvname); | |
76c591b0 KW |
2477 | if (!drv) { |
2478 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
76c591b0 KW |
2479 | goto fail; |
2480 | } | |
2481 | } | |
2482 | ||
2483 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
76c591b0 | 2484 | |
129c7d1c | 2485 | /* See cautionary note on accessing @options above */ |
3e8c2e57 AG |
2486 | backing = qdict_get_try_str(options, "backing"); |
2487 | if (backing && *backing == '\0') { | |
2488 | flags |= BDRV_O_NO_BACKING; | |
2489 | qdict_del(options, "backing"); | |
2490 | } | |
2491 | ||
5696c6e3 | 2492 | /* Open image file without format layer. This BlockBackend is only used for |
4e4bf5c4 KW |
2493 | * probing, the block drivers will do their own bdrv_open_child() for the |
2494 | * same BDS, which is why we put the node name back into options. */ | |
f4788adc | 2495 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
5696c6e3 KW |
2496 | BlockDriverState *file_bs; |
2497 | ||
2498 | file_bs = bdrv_open_child_bs(filename, options, "file", bs, | |
2499 | &child_file, true, &local_err); | |
1fdd6933 | 2500 | if (local_err) { |
f4788adc KW |
2501 | goto fail; |
2502 | } | |
5696c6e3 | 2503 | if (file_bs != NULL) { |
6d0eb64d | 2504 | file = blk_new(BLK_PERM_CONSISTENT_READ, BLK_PERM_ALL); |
d7086422 | 2505 | blk_insert_bs(file, file_bs, &local_err); |
5696c6e3 | 2506 | bdrv_unref(file_bs); |
d7086422 KW |
2507 | if (local_err) { |
2508 | goto fail; | |
2509 | } | |
5696c6e3 | 2510 | |
46f5ac20 | 2511 | qdict_put_str(options, "file", bdrv_get_node_name(file_bs)); |
4e4bf5c4 | 2512 | } |
f500a6d3 KW |
2513 | } |
2514 | ||
76c591b0 | 2515 | /* Image format probing */ |
38f3ef57 | 2516 | bs->probed = !drv; |
76c591b0 | 2517 | if (!drv && file) { |
cf2ab8fc | 2518 | ret = find_image_format(file, filename, &drv, &local_err); |
17b005f1 | 2519 | if (ret < 0) { |
8bfea15d | 2520 | goto fail; |
2a05cbe4 | 2521 | } |
62392ebb KW |
2522 | /* |
2523 | * This option update would logically belong in bdrv_fill_options(), | |
2524 | * but we first need to open bs->file for the probing to work, while | |
2525 | * opening bs->file already requires the (mostly) final set of options | |
2526 | * so that cache mode etc. can be inherited. | |
2527 | * | |
2528 | * Adding the driver later is somewhat ugly, but it's not an option | |
2529 | * that would ever be inherited, so it's correct. We just need to make | |
2530 | * sure to update both bs->options (which has the full effective | |
2531 | * options for bs) and options (which has file.* already removed). | |
2532 | */ | |
46f5ac20 EB |
2533 | qdict_put_str(bs->options, "driver", drv->format_name); |
2534 | qdict_put_str(options, "driver", drv->format_name); | |
76c591b0 | 2535 | } else if (!drv) { |
17b005f1 | 2536 | error_setg(errp, "Must specify either driver or file"); |
8bfea15d | 2537 | goto fail; |
ea2384d3 | 2538 | } |
b6ce07aa | 2539 | |
53a29513 HR |
2540 | /* BDRV_O_PROTOCOL must be set iff a protocol BDS is about to be created */ |
2541 | assert(!!(flags & BDRV_O_PROTOCOL) == !!drv->bdrv_file_open); | |
2542 | /* file must be NULL if a protocol BDS is about to be created | |
2543 | * (the inverse results in an error message from bdrv_open_common()) */ | |
2544 | assert(!(flags & BDRV_O_PROTOCOL) || !file); | |
2545 | ||
b6ce07aa | 2546 | /* Open the image */ |
82dc8b41 | 2547 | ret = bdrv_open_common(bs, file, options, &local_err); |
b6ce07aa | 2548 | if (ret < 0) { |
8bfea15d | 2549 | goto fail; |
6987307c CH |
2550 | } |
2551 | ||
4e4bf5c4 | 2552 | if (file) { |
5696c6e3 | 2553 | blk_unref(file); |
f500a6d3 KW |
2554 | file = NULL; |
2555 | } | |
2556 | ||
b6ce07aa | 2557 | /* If there is a backing file, use it */ |
9156df12 | 2558 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
d9b7b057 | 2559 | ret = bdrv_open_backing_file(bs, options, "backing", &local_err); |
b6ce07aa | 2560 | if (ret < 0) { |
b6ad491a | 2561 | goto close_and_fail; |
b6ce07aa | 2562 | } |
b6ce07aa KW |
2563 | } |
2564 | ||
91af7014 HR |
2565 | bdrv_refresh_filename(bs); |
2566 | ||
b6ad491a | 2567 | /* Check if any unknown options were used */ |
7ad2757f | 2568 | if (qdict_size(options) != 0) { |
b6ad491a | 2569 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
2570 | if (flags & BDRV_O_PROTOCOL) { |
2571 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
2572 | "'%s'", drv->format_name, entry->key); | |
2573 | } else { | |
d0e46a55 HR |
2574 | error_setg(errp, |
2575 | "Block format '%s' does not support the option '%s'", | |
2576 | drv->format_name, entry->key); | |
5acd9d81 | 2577 | } |
b6ad491a | 2578 | |
b6ad491a KW |
2579 | goto close_and_fail; |
2580 | } | |
b6ad491a | 2581 | |
c01c214b | 2582 | bdrv_parent_cb_change_media(bs, true); |
b6ce07aa | 2583 | |
c3adb58f | 2584 | QDECREF(options); |
dd62f1ca KW |
2585 | |
2586 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the | |
2587 | * temporary snapshot afterwards. */ | |
2588 | if (snapshot_flags) { | |
66836189 HR |
2589 | BlockDriverState *snapshot_bs; |
2590 | snapshot_bs = bdrv_append_temp_snapshot(bs, snapshot_flags, | |
2591 | snapshot_options, &local_err); | |
73176bee | 2592 | snapshot_options = NULL; |
dd62f1ca KW |
2593 | if (local_err) { |
2594 | goto close_and_fail; | |
2595 | } | |
5b363937 HR |
2596 | /* We are not going to return bs but the overlay on top of it |
2597 | * (snapshot_bs); thus, we have to drop the strong reference to bs | |
2598 | * (which we obtained by calling bdrv_new()). bs will not be deleted, | |
2599 | * though, because the overlay still has a reference to it. */ | |
2600 | bdrv_unref(bs); | |
2601 | bs = snapshot_bs; | |
dd62f1ca KW |
2602 | } |
2603 | ||
5b363937 | 2604 | return bs; |
b6ce07aa | 2605 | |
8bfea15d | 2606 | fail: |
5696c6e3 | 2607 | blk_unref(file); |
73176bee | 2608 | QDECREF(snapshot_options); |
145f598e | 2609 | QDECREF(bs->explicit_options); |
de9c0cec | 2610 | QDECREF(bs->options); |
b6ad491a | 2611 | QDECREF(options); |
de9c0cec | 2612 | bs->options = NULL; |
998cbd6a | 2613 | bs->explicit_options = NULL; |
5b363937 | 2614 | bdrv_unref(bs); |
621ff94d | 2615 | error_propagate(errp, local_err); |
5b363937 | 2616 | return NULL; |
de9c0cec | 2617 | |
b6ad491a | 2618 | close_and_fail: |
5b363937 | 2619 | bdrv_unref(bs); |
73176bee | 2620 | QDECREF(snapshot_options); |
b6ad491a | 2621 | QDECREF(options); |
621ff94d | 2622 | error_propagate(errp, local_err); |
5b363937 | 2623 | return NULL; |
b6ce07aa KW |
2624 | } |
2625 | ||
5b363937 HR |
2626 | BlockDriverState *bdrv_open(const char *filename, const char *reference, |
2627 | QDict *options, int flags, Error **errp) | |
f3930ed0 | 2628 | { |
5b363937 | 2629 | return bdrv_open_inherit(filename, reference, options, flags, NULL, |
ce343771 | 2630 | NULL, errp); |
f3930ed0 KW |
2631 | } |
2632 | ||
e971aa12 JC |
2633 | typedef struct BlockReopenQueueEntry { |
2634 | bool prepared; | |
2635 | BDRVReopenState state; | |
2636 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
2637 | } BlockReopenQueueEntry; | |
2638 | ||
2639 | /* | |
2640 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
2641 | * reopen of multiple devices. | |
2642 | * | |
2643 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
2644 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
2645 | * be created and initialized. This newly created BlockReopenQueue should be | |
2646 | * passed back in for subsequent calls that are intended to be of the same | |
2647 | * atomic 'set'. | |
2648 | * | |
2649 | * bs is the BlockDriverState to add to the reopen queue. | |
2650 | * | |
4d2cb092 KW |
2651 | * options contains the changed options for the associated bs |
2652 | * (the BlockReopenQueue takes ownership) | |
2653 | * | |
e971aa12 JC |
2654 | * flags contains the open flags for the associated bs |
2655 | * | |
2656 | * returns a pointer to bs_queue, which is either the newly allocated | |
2657 | * bs_queue, or the existing bs_queue being used. | |
2658 | * | |
2659 | */ | |
28518102 KW |
2660 | static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue, |
2661 | BlockDriverState *bs, | |
2662 | QDict *options, | |
2663 | int flags, | |
2664 | const BdrvChildRole *role, | |
2665 | QDict *parent_options, | |
2666 | int parent_flags) | |
e971aa12 JC |
2667 | { |
2668 | assert(bs != NULL); | |
2669 | ||
2670 | BlockReopenQueueEntry *bs_entry; | |
67251a31 | 2671 | BdrvChild *child; |
145f598e | 2672 | QDict *old_options, *explicit_options; |
67251a31 | 2673 | |
e971aa12 JC |
2674 | if (bs_queue == NULL) { |
2675 | bs_queue = g_new0(BlockReopenQueue, 1); | |
2676 | QSIMPLEQ_INIT(bs_queue); | |
2677 | } | |
2678 | ||
4d2cb092 KW |
2679 | if (!options) { |
2680 | options = qdict_new(); | |
2681 | } | |
2682 | ||
5b7ba05f AG |
2683 | /* Check if this BlockDriverState is already in the queue */ |
2684 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
2685 | if (bs == bs_entry->state.bs) { | |
2686 | break; | |
2687 | } | |
2688 | } | |
2689 | ||
28518102 KW |
2690 | /* |
2691 | * Precedence of options: | |
2692 | * 1. Explicitly passed in options (highest) | |
91a097e7 | 2693 | * 2. Set in flags (only for top level) |
145f598e | 2694 | * 3. Retained from explicitly set options of bs |
8e2160e2 | 2695 | * 4. Inherited from parent node |
28518102 KW |
2696 | * 5. Retained from effective options of bs |
2697 | */ | |
2698 | ||
91a097e7 KW |
2699 | if (!parent_options) { |
2700 | /* | |
2701 | * Any setting represented by flags is always updated. If the | |
2702 | * corresponding QDict option is set, it takes precedence. Otherwise | |
2703 | * the flag is translated into a QDict option. The old setting of bs is | |
2704 | * not considered. | |
2705 | */ | |
2706 | update_options_from_flags(options, flags); | |
2707 | } | |
2708 | ||
145f598e | 2709 | /* Old explicitly set values (don't overwrite by inherited value) */ |
5b7ba05f AG |
2710 | if (bs_entry) { |
2711 | old_options = qdict_clone_shallow(bs_entry->state.explicit_options); | |
2712 | } else { | |
2713 | old_options = qdict_clone_shallow(bs->explicit_options); | |
2714 | } | |
145f598e KW |
2715 | bdrv_join_options(bs, options, old_options); |
2716 | QDECREF(old_options); | |
2717 | ||
2718 | explicit_options = qdict_clone_shallow(options); | |
2719 | ||
28518102 KW |
2720 | /* Inherit from parent node */ |
2721 | if (parent_options) { | |
2722 | assert(!flags); | |
8e2160e2 | 2723 | role->inherit_options(&flags, options, parent_flags, parent_options); |
28518102 KW |
2724 | } |
2725 | ||
2726 | /* Old values are used for options that aren't set yet */ | |
4d2cb092 | 2727 | old_options = qdict_clone_shallow(bs->options); |
cddff5ba | 2728 | bdrv_join_options(bs, options, old_options); |
4d2cb092 KW |
2729 | QDECREF(old_options); |
2730 | ||
fd452021 | 2731 | /* bdrv_open_inherit() sets and clears some additional flags internally */ |
f1f25a2e | 2732 | flags &= ~BDRV_O_PROTOCOL; |
fd452021 KW |
2733 | if (flags & BDRV_O_RDWR) { |
2734 | flags |= BDRV_O_ALLOW_RDWR; | |
2735 | } | |
f1f25a2e | 2736 | |
67251a31 | 2737 | QLIST_FOREACH(child, &bs->children, next) { |
4c9dfe5d KW |
2738 | QDict *new_child_options; |
2739 | char *child_key_dot; | |
67251a31 | 2740 | |
4c9dfe5d KW |
2741 | /* reopen can only change the options of block devices that were |
2742 | * implicitly created and inherited options. For other (referenced) | |
2743 | * block devices, a syntax like "backing.foo" results in an error. */ | |
67251a31 KW |
2744 | if (child->bs->inherits_from != bs) { |
2745 | continue; | |
2746 | } | |
2747 | ||
4c9dfe5d KW |
2748 | child_key_dot = g_strdup_printf("%s.", child->name); |
2749 | qdict_extract_subqdict(options, &new_child_options, child_key_dot); | |
2750 | g_free(child_key_dot); | |
2751 | ||
28518102 KW |
2752 | bdrv_reopen_queue_child(bs_queue, child->bs, new_child_options, 0, |
2753 | child->role, options, flags); | |
e971aa12 JC |
2754 | } |
2755 | ||
5b7ba05f AG |
2756 | if (!bs_entry) { |
2757 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
2758 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
2759 | } else { | |
2760 | QDECREF(bs_entry->state.options); | |
2761 | QDECREF(bs_entry->state.explicit_options); | |
2762 | } | |
e971aa12 JC |
2763 | |
2764 | bs_entry->state.bs = bs; | |
4d2cb092 | 2765 | bs_entry->state.options = options; |
145f598e | 2766 | bs_entry->state.explicit_options = explicit_options; |
e971aa12 JC |
2767 | bs_entry->state.flags = flags; |
2768 | ||
2769 | return bs_queue; | |
2770 | } | |
2771 | ||
28518102 KW |
2772 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
2773 | BlockDriverState *bs, | |
2774 | QDict *options, int flags) | |
2775 | { | |
2776 | return bdrv_reopen_queue_child(bs_queue, bs, options, flags, | |
2777 | NULL, NULL, 0); | |
2778 | } | |
2779 | ||
e971aa12 JC |
2780 | /* |
2781 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
2782 | * | |
2783 | * The queue passed in (bs_queue) must have been built up previous | |
2784 | * via bdrv_reopen_queue(). | |
2785 | * | |
2786 | * Reopens all BDS specified in the queue, with the appropriate | |
2787 | * flags. All devices are prepared for reopen, and failure of any | |
2788 | * device will cause all device changes to be abandonded, and intermediate | |
2789 | * data cleaned up. | |
2790 | * | |
2791 | * If all devices prepare successfully, then the changes are committed | |
2792 | * to all devices. | |
2793 | * | |
2794 | */ | |
720150f3 | 2795 | int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp) |
e971aa12 JC |
2796 | { |
2797 | int ret = -1; | |
2798 | BlockReopenQueueEntry *bs_entry, *next; | |
2799 | Error *local_err = NULL; | |
2800 | ||
2801 | assert(bs_queue != NULL); | |
2802 | ||
c9d1a561 | 2803 | aio_context_release(ctx); |
40840e41 | 2804 | bdrv_drain_all_begin(); |
c9d1a561 | 2805 | aio_context_acquire(ctx); |
e971aa12 JC |
2806 | |
2807 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
2808 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
2809 | error_propagate(errp, local_err); | |
2810 | goto cleanup; | |
2811 | } | |
2812 | bs_entry->prepared = true; | |
2813 | } | |
2814 | ||
2815 | /* If we reach this point, we have success and just need to apply the | |
2816 | * changes | |
2817 | */ | |
2818 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
2819 | bdrv_reopen_commit(&bs_entry->state); | |
2820 | } | |
2821 | ||
2822 | ret = 0; | |
2823 | ||
2824 | cleanup: | |
2825 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
2826 | if (ret && bs_entry->prepared) { | |
2827 | bdrv_reopen_abort(&bs_entry->state); | |
145f598e KW |
2828 | } else if (ret) { |
2829 | QDECREF(bs_entry->state.explicit_options); | |
e971aa12 | 2830 | } |
4d2cb092 | 2831 | QDECREF(bs_entry->state.options); |
e971aa12 JC |
2832 | g_free(bs_entry); |
2833 | } | |
2834 | g_free(bs_queue); | |
40840e41 AG |
2835 | |
2836 | bdrv_drain_all_end(); | |
2837 | ||
e971aa12 JC |
2838 | return ret; |
2839 | } | |
2840 | ||
2841 | ||
2842 | /* Reopen a single BlockDriverState with the specified flags. */ | |
2843 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
2844 | { | |
2845 | int ret = -1; | |
2846 | Error *local_err = NULL; | |
4d2cb092 | 2847 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, NULL, bdrv_flags); |
e971aa12 | 2848 | |
720150f3 | 2849 | ret = bdrv_reopen_multiple(bdrv_get_aio_context(bs), queue, &local_err); |
e971aa12 JC |
2850 | if (local_err != NULL) { |
2851 | error_propagate(errp, local_err); | |
2852 | } | |
2853 | return ret; | |
2854 | } | |
2855 | ||
2856 | ||
2857 | /* | |
2858 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
2859 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
2860 | * the block driver layer .bdrv_reopen_prepare() | |
2861 | * | |
2862 | * bs is the BlockDriverState to reopen | |
2863 | * flags are the new open flags | |
2864 | * queue is the reopen queue | |
2865 | * | |
2866 | * Returns 0 on success, non-zero on error. On error errp will be set | |
2867 | * as well. | |
2868 | * | |
2869 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
2870 | * It is the responsibility of the caller to then call the abort() or | |
2871 | * commit() for any other BDS that have been left in a prepare() state | |
2872 | * | |
2873 | */ | |
2874 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
2875 | Error **errp) | |
2876 | { | |
2877 | int ret = -1; | |
2878 | Error *local_err = NULL; | |
2879 | BlockDriver *drv; | |
ccf9dc07 KW |
2880 | QemuOpts *opts; |
2881 | const char *value; | |
3d8ce171 | 2882 | bool read_only; |
e971aa12 JC |
2883 | |
2884 | assert(reopen_state != NULL); | |
2885 | assert(reopen_state->bs->drv != NULL); | |
2886 | drv = reopen_state->bs->drv; | |
2887 | ||
ccf9dc07 KW |
2888 | /* Process generic block layer options */ |
2889 | opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort); | |
2890 | qemu_opts_absorb_qdict(opts, reopen_state->options, &local_err); | |
2891 | if (local_err) { | |
2892 | error_propagate(errp, local_err); | |
2893 | ret = -EINVAL; | |
2894 | goto error; | |
2895 | } | |
2896 | ||
91a097e7 KW |
2897 | update_flags_from_options(&reopen_state->flags, opts); |
2898 | ||
ccf9dc07 KW |
2899 | /* node-name and driver must be unchanged. Put them back into the QDict, so |
2900 | * that they are checked at the end of this function. */ | |
2901 | value = qemu_opt_get(opts, "node-name"); | |
2902 | if (value) { | |
46f5ac20 | 2903 | qdict_put_str(reopen_state->options, "node-name", value); |
ccf9dc07 KW |
2904 | } |
2905 | ||
2906 | value = qemu_opt_get(opts, "driver"); | |
2907 | if (value) { | |
46f5ac20 | 2908 | qdict_put_str(reopen_state->options, "driver", value); |
ccf9dc07 KW |
2909 | } |
2910 | ||
3d8ce171 JC |
2911 | /* If we are to stay read-only, do not allow permission change |
2912 | * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is | |
2913 | * not set, or if the BDS still has copy_on_read enabled */ | |
2914 | read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
54a32bfe | 2915 | ret = bdrv_can_set_read_only(reopen_state->bs, read_only, true, &local_err); |
3d8ce171 JC |
2916 | if (local_err) { |
2917 | error_propagate(errp, local_err); | |
e971aa12 JC |
2918 | goto error; |
2919 | } | |
2920 | ||
2921 | ||
2922 | ret = bdrv_flush(reopen_state->bs); | |
2923 | if (ret) { | |
455b0fde | 2924 | error_setg_errno(errp, -ret, "Error flushing drive"); |
e971aa12 JC |
2925 | goto error; |
2926 | } | |
2927 | ||
2928 | if (drv->bdrv_reopen_prepare) { | |
2929 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
2930 | if (ret) { | |
2931 | if (local_err != NULL) { | |
2932 | error_propagate(errp, local_err); | |
2933 | } else { | |
d8b6895f LC |
2934 | error_setg(errp, "failed while preparing to reopen image '%s'", |
2935 | reopen_state->bs->filename); | |
e971aa12 JC |
2936 | } |
2937 | goto error; | |
2938 | } | |
2939 | } else { | |
2940 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
2941 | * handler for each supported drv. */ | |
81e5f78a AG |
2942 | error_setg(errp, "Block format '%s' used by node '%s' " |
2943 | "does not support reopening files", drv->format_name, | |
2944 | bdrv_get_device_or_node_name(reopen_state->bs)); | |
e971aa12 JC |
2945 | ret = -1; |
2946 | goto error; | |
2947 | } | |
2948 | ||
4d2cb092 KW |
2949 | /* Options that are not handled are only okay if they are unchanged |
2950 | * compared to the old state. It is expected that some options are only | |
2951 | * used for the initial open, but not reopen (e.g. filename) */ | |
2952 | if (qdict_size(reopen_state->options)) { | |
2953 | const QDictEntry *entry = qdict_first(reopen_state->options); | |
2954 | ||
2955 | do { | |
2956 | QString *new_obj = qobject_to_qstring(entry->value); | |
2957 | const char *new = qstring_get_str(new_obj); | |
129c7d1c MA |
2958 | /* |
2959 | * Caution: while qdict_get_try_str() is fine, getting | |
2960 | * non-string types would require more care. When | |
2961 | * bs->options come from -blockdev or blockdev_add, its | |
2962 | * members are typed according to the QAPI schema, but | |
2963 | * when they come from -drive, they're all QString. | |
2964 | */ | |
4d2cb092 KW |
2965 | const char *old = qdict_get_try_str(reopen_state->bs->options, |
2966 | entry->key); | |
2967 | ||
2968 | if (!old || strcmp(new, old)) { | |
2969 | error_setg(errp, "Cannot change the option '%s'", entry->key); | |
2970 | ret = -EINVAL; | |
2971 | goto error; | |
2972 | } | |
2973 | } while ((entry = qdict_next(reopen_state->options, entry))); | |
2974 | } | |
2975 | ||
e971aa12 JC |
2976 | ret = 0; |
2977 | ||
2978 | error: | |
ccf9dc07 | 2979 | qemu_opts_del(opts); |
e971aa12 JC |
2980 | return ret; |
2981 | } | |
2982 | ||
2983 | /* | |
2984 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
2985 | * makes them final by swapping the staging BlockDriverState contents into | |
2986 | * the active BlockDriverState contents. | |
2987 | */ | |
2988 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
2989 | { | |
2990 | BlockDriver *drv; | |
50bf65ba | 2991 | BlockDriverState *bs; |
cb9ff6c2 | 2992 | bool old_can_write, new_can_write; |
e971aa12 JC |
2993 | |
2994 | assert(reopen_state != NULL); | |
50bf65ba VSO |
2995 | bs = reopen_state->bs; |
2996 | drv = bs->drv; | |
e971aa12 JC |
2997 | assert(drv != NULL); |
2998 | ||
cb9ff6c2 VSO |
2999 | old_can_write = |
3000 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); | |
3001 | ||
e971aa12 JC |
3002 | /* If there are any driver level actions to take */ |
3003 | if (drv->bdrv_reopen_commit) { | |
3004 | drv->bdrv_reopen_commit(reopen_state); | |
3005 | } | |
3006 | ||
3007 | /* set BDS specific flags now */ | |
50bf65ba | 3008 | QDECREF(bs->explicit_options); |
145f598e | 3009 | |
50bf65ba VSO |
3010 | bs->explicit_options = reopen_state->explicit_options; |
3011 | bs->open_flags = reopen_state->flags; | |
3012 | bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac | 3013 | |
50bf65ba | 3014 | bdrv_refresh_limits(bs, NULL); |
cb9ff6c2 VSO |
3015 | |
3016 | new_can_write = | |
3017 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE); | |
3018 | if (!old_can_write && new_can_write && drv->bdrv_reopen_bitmaps_rw) { | |
3019 | Error *local_err = NULL; | |
3020 | if (drv->bdrv_reopen_bitmaps_rw(bs, &local_err) < 0) { | |
3021 | /* This is not fatal, bitmaps just left read-only, so all following | |
3022 | * writes will fail. User can remove read-only bitmaps to unblock | |
3023 | * writes. | |
3024 | */ | |
3025 | error_reportf_err(local_err, | |
3026 | "%s: Failed to make dirty bitmaps writable: ", | |
3027 | bdrv_get_node_name(bs)); | |
3028 | } | |
3029 | } | |
e971aa12 JC |
3030 | } |
3031 | ||
3032 | /* | |
3033 | * Abort the reopen, and delete and free the staged changes in | |
3034 | * reopen_state | |
3035 | */ | |
3036 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
3037 | { | |
3038 | BlockDriver *drv; | |
3039 | ||
3040 | assert(reopen_state != NULL); | |
3041 | drv = reopen_state->bs->drv; | |
3042 | assert(drv != NULL); | |
3043 | ||
3044 | if (drv->bdrv_reopen_abort) { | |
3045 | drv->bdrv_reopen_abort(reopen_state); | |
3046 | } | |
145f598e KW |
3047 | |
3048 | QDECREF(reopen_state->explicit_options); | |
e971aa12 JC |
3049 | } |
3050 | ||
3051 | ||
64dff520 | 3052 | static void bdrv_close(BlockDriverState *bs) |
fc01f7e7 | 3053 | { |
33384421 HR |
3054 | BdrvAioNotifier *ban, *ban_next; |
3055 | ||
ca9bd24c | 3056 | assert(!bs->job); |
30f55fb8 | 3057 | assert(!bs->refcnt); |
99b7e775 | 3058 | |
fc27291d | 3059 | bdrv_drained_begin(bs); /* complete I/O */ |
58fda173 | 3060 | bdrv_flush(bs); |
53ec73e2 | 3061 | bdrv_drain(bs); /* in case flush left pending I/O */ |
fc27291d | 3062 | |
3cbc002c | 3063 | if (bs->drv) { |
6e93e7c4 KW |
3064 | BdrvChild *child, *next; |
3065 | ||
9a7dedbc | 3066 | bs->drv->bdrv_close(bs); |
9a4f4c31 | 3067 | bs->drv = NULL; |
9a7dedbc | 3068 | |
12fa4af6 | 3069 | bdrv_set_backing_hd(bs, NULL, &error_abort); |
9a7dedbc | 3070 | |
9a4f4c31 KW |
3071 | if (bs->file != NULL) { |
3072 | bdrv_unref_child(bs, bs->file); | |
3073 | bs->file = NULL; | |
3074 | } | |
3075 | ||
6e93e7c4 | 3076 | QLIST_FOREACH_SAFE(child, &bs->children, next, next) { |
33a60407 KW |
3077 | /* TODO Remove bdrv_unref() from drivers' close function and use |
3078 | * bdrv_unref_child() here */ | |
bddcec37 KW |
3079 | if (child->bs->inherits_from == bs) { |
3080 | child->bs->inherits_from = NULL; | |
3081 | } | |
33a60407 | 3082 | bdrv_detach_child(child); |
6e93e7c4 KW |
3083 | } |
3084 | ||
7267c094 | 3085 | g_free(bs->opaque); |
ea2384d3 | 3086 | bs->opaque = NULL; |
d3faa13e | 3087 | atomic_set(&bs->copy_on_read, 0); |
a275fa42 PB |
3088 | bs->backing_file[0] = '\0'; |
3089 | bs->backing_format[0] = '\0'; | |
6405875c | 3090 | bs->total_sectors = 0; |
54115412 | 3091 | bs->encrypted = false; |
54115412 | 3092 | bs->sg = false; |
de9c0cec | 3093 | QDECREF(bs->options); |
145f598e | 3094 | QDECREF(bs->explicit_options); |
de9c0cec | 3095 | bs->options = NULL; |
998cbd6a | 3096 | bs->explicit_options = NULL; |
91af7014 HR |
3097 | QDECREF(bs->full_open_options); |
3098 | bs->full_open_options = NULL; | |
b338082b | 3099 | } |
98f90dba | 3100 | |
cca43ae1 VSO |
3101 | bdrv_release_named_dirty_bitmaps(bs); |
3102 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); | |
3103 | ||
33384421 HR |
3104 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { |
3105 | g_free(ban); | |
3106 | } | |
3107 | QLIST_INIT(&bs->aio_notifiers); | |
fc27291d | 3108 | bdrv_drained_end(bs); |
b338082b FB |
3109 | } |
3110 | ||
2bc93fed MK |
3111 | void bdrv_close_all(void) |
3112 | { | |
a1a2af07 | 3113 | block_job_cancel_sync_all(); |
cd7fca95 | 3114 | nbd_export_close_all(); |
ca9bd24c HR |
3115 | |
3116 | /* Drop references from requests still in flight, such as canceled block | |
3117 | * jobs whose AIO context has not been polled yet */ | |
3118 | bdrv_drain_all(); | |
2bc93fed | 3119 | |
ca9bd24c HR |
3120 | blk_remove_all_bs(); |
3121 | blockdev_close_all_bdrv_states(); | |
ed78cda3 | 3122 | |
a1a2af07 | 3123 | assert(QTAILQ_EMPTY(&all_bdrv_states)); |
2bc93fed MK |
3124 | } |
3125 | ||
d0ac0380 KW |
3126 | static bool should_update_child(BdrvChild *c, BlockDriverState *to) |
3127 | { | |
3128 | BdrvChild *to_c; | |
3129 | ||
3130 | if (c->role->stay_at_node) { | |
3131 | return false; | |
3132 | } | |
3133 | ||
3134 | if (c->role == &child_backing) { | |
3135 | /* If @from is a backing file of @to, ignore the child to avoid | |
3136 | * creating a loop. We only want to change the pointer of other | |
3137 | * parents. */ | |
3138 | QLIST_FOREACH(to_c, &to->children, next) { | |
3139 | if (to_c == c) { | |
3140 | break; | |
3141 | } | |
3142 | } | |
3143 | if (to_c) { | |
3144 | return false; | |
3145 | } | |
3146 | } | |
3147 | ||
3148 | return true; | |
3149 | } | |
3150 | ||
5fe31c25 KW |
3151 | void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, |
3152 | Error **errp) | |
dd62f1ca | 3153 | { |
d0ac0380 | 3154 | BdrvChild *c, *next; |
234ac1a9 KW |
3155 | GSList *list = NULL, *p; |
3156 | uint64_t old_perm, old_shared; | |
3157 | uint64_t perm = 0, shared = BLK_PERM_ALL; | |
3158 | int ret; | |
3159 | ||
5fe31c25 KW |
3160 | assert(!atomic_read(&from->in_flight)); |
3161 | assert(!atomic_read(&to->in_flight)); | |
dd62f1ca | 3162 | |
234ac1a9 KW |
3163 | /* Make sure that @from doesn't go away until we have successfully attached |
3164 | * all of its parents to @to. */ | |
3165 | bdrv_ref(from); | |
dd62f1ca | 3166 | |
234ac1a9 | 3167 | /* Put all parents into @list and calculate their cumulative permissions */ |
dd62f1ca | 3168 | QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) { |
d0ac0380 | 3169 | if (!should_update_child(c, to)) { |
26de9438 KW |
3170 | continue; |
3171 | } | |
234ac1a9 KW |
3172 | list = g_slist_prepend(list, c); |
3173 | perm |= c->perm; | |
3174 | shared &= c->shared_perm; | |
3175 | } | |
3176 | ||
3177 | /* Check whether the required permissions can be granted on @to, ignoring | |
3178 | * all BdrvChild in @list so that they can't block themselves. */ | |
3179 | ret = bdrv_check_update_perm(to, perm, shared, list, errp); | |
3180 | if (ret < 0) { | |
3181 | bdrv_abort_perm_update(to); | |
3182 | goto out; | |
3183 | } | |
3184 | ||
3185 | /* Now actually perform the change. We performed the permission check for | |
3186 | * all elements of @list at once, so set the permissions all at once at the | |
3187 | * very end. */ | |
3188 | for (p = list; p != NULL; p = p->next) { | |
3189 | c = p->data; | |
9bd910e2 | 3190 | |
dd62f1ca | 3191 | bdrv_ref(to); |
234ac1a9 | 3192 | bdrv_replace_child_noperm(c, to); |
dd62f1ca KW |
3193 | bdrv_unref(from); |
3194 | } | |
234ac1a9 KW |
3195 | |
3196 | bdrv_get_cumulative_perm(to, &old_perm, &old_shared); | |
3197 | bdrv_set_perm(to, old_perm | perm, old_shared | shared); | |
3198 | ||
3199 | out: | |
3200 | g_slist_free(list); | |
3201 | bdrv_unref(from); | |
dd62f1ca KW |
3202 | } |
3203 | ||
4ddc07ca PB |
3204 | /* |
3205 | * Add new bs contents at the top of an image chain while the chain is | |
3206 | * live, while keeping required fields on the top layer. | |
3207 | * | |
3208 | * This will modify the BlockDriverState fields, and swap contents | |
3209 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
3210 | * | |
bfb197e0 | 3211 | * bs_new must not be attached to a BlockBackend. |
4ddc07ca PB |
3212 | * |
3213 | * This function does not create any image files. | |
dd62f1ca KW |
3214 | * |
3215 | * bdrv_append() takes ownership of a bs_new reference and unrefs it because | |
3216 | * that's what the callers commonly need. bs_new will be referenced by the old | |
3217 | * parents of bs_top after bdrv_append() returns. If the caller needs to keep a | |
3218 | * reference of its own, it must call bdrv_ref(). | |
4ddc07ca | 3219 | */ |
b2c2832c KW |
3220 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, |
3221 | Error **errp) | |
4ddc07ca | 3222 | { |
b2c2832c KW |
3223 | Error *local_err = NULL; |
3224 | ||
b2c2832c KW |
3225 | bdrv_set_backing_hd(bs_new, bs_top, &local_err); |
3226 | if (local_err) { | |
3227 | error_propagate(errp, local_err); | |
3228 | goto out; | |
3229 | } | |
dd62f1ca | 3230 | |
5fe31c25 | 3231 | bdrv_replace_node(bs_top, bs_new, &local_err); |
234ac1a9 KW |
3232 | if (local_err) { |
3233 | error_propagate(errp, local_err); | |
3234 | bdrv_set_backing_hd(bs_new, NULL, &error_abort); | |
3235 | goto out; | |
3236 | } | |
4ddc07ca | 3237 | |
dd62f1ca KW |
3238 | /* bs_new is now referenced by its new parents, we don't need the |
3239 | * additional reference any more. */ | |
b2c2832c | 3240 | out: |
dd62f1ca | 3241 | bdrv_unref(bs_new); |
8802d1fd JC |
3242 | } |
3243 | ||
4f6fd349 | 3244 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 3245 | { |
3e914655 | 3246 | assert(!bs->job); |
3718d8ab | 3247 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 3248 | assert(!bs->refcnt); |
18846dee | 3249 | |
e1b5c52e SH |
3250 | bdrv_close(bs); |
3251 | ||
1b7bdbc1 | 3252 | /* remove from list, if necessary */ |
63eaaae0 KW |
3253 | if (bs->node_name[0] != '\0') { |
3254 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
3255 | } | |
2c1d04e0 HR |
3256 | QTAILQ_REMOVE(&all_bdrv_states, bs, bs_list); |
3257 | ||
7267c094 | 3258 | g_free(bs); |
fc01f7e7 FB |
3259 | } |
3260 | ||
e97fc193 AL |
3261 | /* |
3262 | * Run consistency checks on an image | |
3263 | * | |
e076f338 | 3264 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 3265 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 3266 | * check are stored in res. |
e97fc193 | 3267 | */ |
4534ff54 | 3268 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 | 3269 | { |
908bcd54 HR |
3270 | if (bs->drv == NULL) { |
3271 | return -ENOMEDIUM; | |
3272 | } | |
e97fc193 AL |
3273 | if (bs->drv->bdrv_check == NULL) { |
3274 | return -ENOTSUP; | |
3275 | } | |
3276 | ||
e076f338 | 3277 | memset(res, 0, sizeof(*res)); |
4534ff54 | 3278 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
3279 | } |
3280 | ||
756e6736 KW |
3281 | /* |
3282 | * Return values: | |
3283 | * 0 - success | |
3284 | * -EINVAL - backing format specified, but no file | |
3285 | * -ENOSPC - can't update the backing file because no space is left in the | |
3286 | * image file header | |
3287 | * -ENOTSUP - format driver doesn't support changing the backing file | |
3288 | */ | |
3289 | int bdrv_change_backing_file(BlockDriverState *bs, | |
3290 | const char *backing_file, const char *backing_fmt) | |
3291 | { | |
3292 | BlockDriver *drv = bs->drv; | |
469ef350 | 3293 | int ret; |
756e6736 | 3294 | |
5f377794 PB |
3295 | /* Backing file format doesn't make sense without a backing file */ |
3296 | if (backing_fmt && !backing_file) { | |
3297 | return -EINVAL; | |
3298 | } | |
3299 | ||
756e6736 | 3300 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 3301 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 3302 | } else { |
469ef350 | 3303 | ret = -ENOTSUP; |
756e6736 | 3304 | } |
469ef350 PB |
3305 | |
3306 | if (ret == 0) { | |
3307 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
3308 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
3309 | } | |
3310 | return ret; | |
756e6736 KW |
3311 | } |
3312 | ||
6ebdcee2 JC |
3313 | /* |
3314 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
3315 | * | |
3316 | * active is the current topmost image. | |
3317 | * | |
3318 | * Returns NULL if bs is not found in active's image chain, | |
3319 | * or if active == bs. | |
4caf0fcd JC |
3320 | * |
3321 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
3322 | */ |
3323 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
3324 | BlockDriverState *bs) | |
3325 | { | |
760e0063 KW |
3326 | while (active && bs != backing_bs(active)) { |
3327 | active = backing_bs(active); | |
6ebdcee2 JC |
3328 | } |
3329 | ||
4caf0fcd JC |
3330 | return active; |
3331 | } | |
6ebdcee2 | 3332 | |
4caf0fcd JC |
3333 | /* Given a BDS, searches for the base layer. */ |
3334 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
3335 | { | |
3336 | return bdrv_find_overlay(bs, NULL); | |
6ebdcee2 JC |
3337 | } |
3338 | ||
6ebdcee2 JC |
3339 | /* |
3340 | * Drops images above 'base' up to and including 'top', and sets the image | |
3341 | * above 'top' to have base as its backing file. | |
3342 | * | |
3343 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
3344 | * information in 'bs' can be properly updated. | |
3345 | * | |
3346 | * E.g., this will convert the following chain: | |
3347 | * bottom <- base <- intermediate <- top <- active | |
3348 | * | |
3349 | * to | |
3350 | * | |
3351 | * bottom <- base <- active | |
3352 | * | |
3353 | * It is allowed for bottom==base, in which case it converts: | |
3354 | * | |
3355 | * base <- intermediate <- top <- active | |
3356 | * | |
3357 | * to | |
3358 | * | |
3359 | * base <- active | |
3360 | * | |
54e26900 JC |
3361 | * If backing_file_str is non-NULL, it will be used when modifying top's |
3362 | * overlay image metadata. | |
3363 | * | |
6ebdcee2 JC |
3364 | * Error conditions: |
3365 | * if active == top, that is considered an error | |
3366 | * | |
3367 | */ | |
3368 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
54e26900 | 3369 | BlockDriverState *base, const char *backing_file_str) |
6ebdcee2 | 3370 | { |
6ebdcee2 | 3371 | BlockDriverState *new_top_bs = NULL; |
12fa4af6 | 3372 | Error *local_err = NULL; |
6ebdcee2 JC |
3373 | int ret = -EIO; |
3374 | ||
6ebdcee2 JC |
3375 | if (!top->drv || !base->drv) { |
3376 | goto exit; | |
3377 | } | |
3378 | ||
3379 | new_top_bs = bdrv_find_overlay(active, top); | |
3380 | ||
3381 | if (new_top_bs == NULL) { | |
3382 | /* we could not find the image above 'top', this is an error */ | |
3383 | goto exit; | |
3384 | } | |
3385 | ||
760e0063 | 3386 | /* special case of new_top_bs->backing->bs already pointing to base - nothing |
6ebdcee2 | 3387 | * to do, no intermediate images */ |
760e0063 | 3388 | if (backing_bs(new_top_bs) == base) { |
6ebdcee2 JC |
3389 | ret = 0; |
3390 | goto exit; | |
3391 | } | |
3392 | ||
5db15a57 KW |
3393 | /* Make sure that base is in the backing chain of top */ |
3394 | if (!bdrv_chain_contains(top, base)) { | |
6ebdcee2 JC |
3395 | goto exit; |
3396 | } | |
3397 | ||
3398 | /* success - we can delete the intermediate states, and link top->base */ | |
5db15a57 | 3399 | backing_file_str = backing_file_str ? backing_file_str : base->filename; |
54e26900 | 3400 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, |
5db15a57 | 3401 | base->drv ? base->drv->format_name : ""); |
6ebdcee2 JC |
3402 | if (ret) { |
3403 | goto exit; | |
3404 | } | |
12fa4af6 KW |
3405 | |
3406 | bdrv_set_backing_hd(new_top_bs, base, &local_err); | |
3407 | if (local_err) { | |
3408 | ret = -EPERM; | |
3409 | error_report_err(local_err); | |
3410 | goto exit; | |
3411 | } | |
6ebdcee2 | 3412 | |
6ebdcee2 | 3413 | ret = 0; |
6ebdcee2 | 3414 | exit: |
6ebdcee2 JC |
3415 | return ret; |
3416 | } | |
3417 | ||
61007b31 SH |
3418 | /** |
3419 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3420 | */ | |
7ea37c30 HR |
3421 | int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, |
3422 | Error **errp) | |
71d0770c | 3423 | { |
52cdbc58 | 3424 | BlockDriverState *bs = child->bs; |
61007b31 SH |
3425 | BlockDriver *drv = bs->drv; |
3426 | int ret; | |
c8f6d58e | 3427 | |
362b3786 | 3428 | assert(child->perm & BLK_PERM_RESIZE); |
c8f6d58e | 3429 | |
ed3d2ec9 HR |
3430 | if (!drv) { |
3431 | error_setg(errp, "No medium inserted"); | |
71d0770c | 3432 | return -ENOMEDIUM; |
ed3d2ec9 HR |
3433 | } |
3434 | if (!drv->bdrv_truncate) { | |
3435 | error_setg(errp, "Image format driver does not support resize"); | |
61007b31 | 3436 | return -ENOTSUP; |
ed3d2ec9 HR |
3437 | } |
3438 | if (bs->read_only) { | |
3439 | error_setg(errp, "Image is read-only"); | |
61007b31 | 3440 | return -EACCES; |
ed3d2ec9 | 3441 | } |
71d0770c | 3442 | |
504c205a DL |
3443 | assert(!(bs->open_flags & BDRV_O_INACTIVE)); |
3444 | ||
7ea37c30 | 3445 | ret = drv->bdrv_truncate(bs, offset, prealloc, errp); |
61007b31 SH |
3446 | if (ret == 0) { |
3447 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
3448 | bdrv_dirty_bitmap_truncate(bs); | |
5c8cab48 | 3449 | bdrv_parent_cb_resize(bs); |
47fec599 | 3450 | atomic_inc(&bs->write_gen); |
c0191e76 | 3451 | } |
61007b31 | 3452 | return ret; |
71d0770c AL |
3453 | } |
3454 | ||
61007b31 SH |
3455 | /** |
3456 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3457 | * allocated space. Return < 0 if error or unknown. | |
3458 | */ | |
3459 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
71d0770c | 3460 | { |
61007b31 SH |
3461 | BlockDriver *drv = bs->drv; |
3462 | if (!drv) { | |
3463 | return -ENOMEDIUM; | |
8f4754ed | 3464 | } |
61007b31 SH |
3465 | if (drv->bdrv_get_allocated_file_size) { |
3466 | return drv->bdrv_get_allocated_file_size(bs); | |
3467 | } | |
3468 | if (bs->file) { | |
9a4f4c31 | 3469 | return bdrv_get_allocated_file_size(bs->file->bs); |
1c9805a3 | 3470 | } |
61007b31 | 3471 | return -ENOTSUP; |
1c9805a3 | 3472 | } |
e7a8a783 | 3473 | |
90880ff1 SH |
3474 | /* |
3475 | * bdrv_measure: | |
3476 | * @drv: Format driver | |
3477 | * @opts: Creation options for new image | |
3478 | * @in_bs: Existing image containing data for new image (may be NULL) | |
3479 | * @errp: Error object | |
3480 | * Returns: A #BlockMeasureInfo (free using qapi_free_BlockMeasureInfo()) | |
3481 | * or NULL on error | |
3482 | * | |
3483 | * Calculate file size required to create a new image. | |
3484 | * | |
3485 | * If @in_bs is given then space for allocated clusters and zero clusters | |
3486 | * from that image are included in the calculation. If @opts contains a | |
3487 | * backing file that is shared by @in_bs then backing clusters may be omitted | |
3488 | * from the calculation. | |
3489 | * | |
3490 | * If @in_bs is NULL then the calculation includes no allocated clusters | |
3491 | * unless a preallocation option is given in @opts. | |
3492 | * | |
3493 | * Note that @in_bs may use a different BlockDriver from @drv. | |
3494 | * | |
3495 | * If an error occurs the @errp pointer is set. | |
3496 | */ | |
3497 | BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, | |
3498 | BlockDriverState *in_bs, Error **errp) | |
3499 | { | |
3500 | if (!drv->bdrv_measure) { | |
3501 | error_setg(errp, "Block driver '%s' does not support size measurement", | |
3502 | drv->format_name); | |
3503 | return NULL; | |
3504 | } | |
3505 | ||
3506 | return drv->bdrv_measure(opts, in_bs, errp); | |
3507 | } | |
3508 | ||
61007b31 SH |
3509 | /** |
3510 | * Return number of sectors on success, -errno on error. | |
1c9805a3 | 3511 | */ |
61007b31 | 3512 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
1c9805a3 | 3513 | { |
61007b31 | 3514 | BlockDriver *drv = bs->drv; |
498e386c | 3515 | |
61007b31 SH |
3516 | if (!drv) |
3517 | return -ENOMEDIUM; | |
2572b37a | 3518 | |
61007b31 SH |
3519 | if (drv->has_variable_length) { |
3520 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3521 | if (ret < 0) { | |
3522 | return ret; | |
1c9805a3 SH |
3523 | } |
3524 | } | |
61007b31 | 3525 | return bs->total_sectors; |
1c9805a3 | 3526 | } |
b338082b | 3527 | |
61007b31 SH |
3528 | /** |
3529 | * Return length in bytes on success, -errno on error. | |
3530 | * The length is always a multiple of BDRV_SECTOR_SIZE. | |
8d3b1a2d | 3531 | */ |
61007b31 | 3532 | int64_t bdrv_getlength(BlockDriverState *bs) |
8d3b1a2d | 3533 | { |
61007b31 | 3534 | int64_t ret = bdrv_nb_sectors(bs); |
8d3b1a2d | 3535 | |
4a9c9ea0 | 3536 | ret = ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; |
61007b31 | 3537 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3538 | } |
3539 | ||
61007b31 SH |
3540 | /* return 0 as number of sectors if no device present or error */ |
3541 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) | |
07d27a44 | 3542 | { |
61007b31 | 3543 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
07d27a44 | 3544 | |
61007b31 | 3545 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; |
07d27a44 MA |
3546 | } |
3547 | ||
54115412 | 3548 | bool bdrv_is_sg(BlockDriverState *bs) |
f08145fe | 3549 | { |
61007b31 | 3550 | return bs->sg; |
f08145fe KW |
3551 | } |
3552 | ||
54115412 | 3553 | bool bdrv_is_encrypted(BlockDriverState *bs) |
fc3959e4 | 3554 | { |
760e0063 | 3555 | if (bs->backing && bs->backing->bs->encrypted) { |
54115412 | 3556 | return true; |
760e0063 | 3557 | } |
61007b31 | 3558 | return bs->encrypted; |
fc3959e4 FZ |
3559 | } |
3560 | ||
61007b31 | 3561 | const char *bdrv_get_format_name(BlockDriverState *bs) |
40b4f539 | 3562 | { |
61007b31 | 3563 | return bs->drv ? bs->drv->format_name : NULL; |
40b4f539 KW |
3564 | } |
3565 | ||
61007b31 | 3566 | static int qsort_strcmp(const void *a, const void *b) |
40b4f539 | 3567 | { |
ceff5bd7 | 3568 | return strcmp(*(char *const *)a, *(char *const *)b); |
40b4f539 KW |
3569 | } |
3570 | ||
61007b31 SH |
3571 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
3572 | void *opaque) | |
40b4f539 | 3573 | { |
61007b31 SH |
3574 | BlockDriver *drv; |
3575 | int count = 0; | |
3576 | int i; | |
3577 | const char **formats = NULL; | |
40b4f539 | 3578 | |
61007b31 SH |
3579 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
3580 | if (drv->format_name) { | |
3581 | bool found = false; | |
3582 | int i = count; | |
3583 | while (formats && i && !found) { | |
3584 | found = !strcmp(formats[--i], drv->format_name); | |
3585 | } | |
e2a305fb | 3586 | |
61007b31 SH |
3587 | if (!found) { |
3588 | formats = g_renew(const char *, formats, count + 1); | |
3589 | formats[count++] = drv->format_name; | |
3590 | } | |
6c5a42ac | 3591 | } |
61007b31 | 3592 | } |
6c5a42ac | 3593 | |
eb0df69f HR |
3594 | for (i = 0; i < (int)ARRAY_SIZE(block_driver_modules); i++) { |
3595 | const char *format_name = block_driver_modules[i].format_name; | |
3596 | ||
3597 | if (format_name) { | |
3598 | bool found = false; | |
3599 | int j = count; | |
3600 | ||
3601 | while (formats && j && !found) { | |
3602 | found = !strcmp(formats[--j], format_name); | |
3603 | } | |
3604 | ||
3605 | if (!found) { | |
3606 | formats = g_renew(const char *, formats, count + 1); | |
3607 | formats[count++] = format_name; | |
3608 | } | |
3609 | } | |
3610 | } | |
3611 | ||
61007b31 | 3612 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); |
40b4f539 | 3613 | |
61007b31 SH |
3614 | for (i = 0; i < count; i++) { |
3615 | it(opaque, formats[i]); | |
3616 | } | |
40b4f539 | 3617 | |
61007b31 SH |
3618 | g_free(formats); |
3619 | } | |
40b4f539 | 3620 | |
61007b31 SH |
3621 | /* This function is to find a node in the bs graph */ |
3622 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3623 | { | |
3624 | BlockDriverState *bs; | |
391827eb | 3625 | |
61007b31 | 3626 | assert(node_name); |
40b4f539 | 3627 | |
61007b31 SH |
3628 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
3629 | if (!strcmp(node_name, bs->node_name)) { | |
3630 | return bs; | |
40b4f539 KW |
3631 | } |
3632 | } | |
61007b31 | 3633 | return NULL; |
40b4f539 KW |
3634 | } |
3635 | ||
61007b31 SH |
3636 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3637 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) | |
40b4f539 | 3638 | { |
61007b31 SH |
3639 | BlockDeviceInfoList *list, *entry; |
3640 | BlockDriverState *bs; | |
40b4f539 | 3641 | |
61007b31 SH |
3642 | list = NULL; |
3643 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
c83f9fba | 3644 | BlockDeviceInfo *info = bdrv_block_device_info(NULL, bs, errp); |
61007b31 SH |
3645 | if (!info) { |
3646 | qapi_free_BlockDeviceInfoList(list); | |
3647 | return NULL; | |
301db7c2 | 3648 | } |
61007b31 SH |
3649 | entry = g_malloc0(sizeof(*entry)); |
3650 | entry->value = info; | |
3651 | entry->next = list; | |
3652 | list = entry; | |
301db7c2 RH |
3653 | } |
3654 | ||
61007b31 SH |
3655 | return list; |
3656 | } | |
40b4f539 | 3657 | |
61007b31 SH |
3658 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3659 | const char *node_name, | |
3660 | Error **errp) | |
3661 | { | |
3662 | BlockBackend *blk; | |
3663 | BlockDriverState *bs; | |
40b4f539 | 3664 | |
61007b31 SH |
3665 | if (device) { |
3666 | blk = blk_by_name(device); | |
40b4f539 | 3667 | |
61007b31 | 3668 | if (blk) { |
9f4ed6fb AG |
3669 | bs = blk_bs(blk); |
3670 | if (!bs) { | |
5433c24f | 3671 | error_setg(errp, "Device '%s' has no medium", device); |
5433c24f HR |
3672 | } |
3673 | ||
9f4ed6fb | 3674 | return bs; |
61007b31 SH |
3675 | } |
3676 | } | |
40b4f539 | 3677 | |
61007b31 SH |
3678 | if (node_name) { |
3679 | bs = bdrv_find_node(node_name); | |
6d519a5f | 3680 | |
61007b31 SH |
3681 | if (bs) { |
3682 | return bs; | |
3683 | } | |
40b4f539 KW |
3684 | } |
3685 | ||
61007b31 SH |
3686 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3687 | device ? device : "", | |
3688 | node_name ? node_name : ""); | |
3689 | return NULL; | |
40b4f539 KW |
3690 | } |
3691 | ||
61007b31 SH |
3692 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
3693 | * return false. If either argument is NULL, return false. */ | |
3694 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
83f64091 | 3695 | { |
61007b31 | 3696 | while (top && top != base) { |
760e0063 | 3697 | top = backing_bs(top); |
02c50efe | 3698 | } |
61007b31 SH |
3699 | |
3700 | return top != NULL; | |
02c50efe FZ |
3701 | } |
3702 | ||
61007b31 | 3703 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
02c50efe | 3704 | { |
61007b31 SH |
3705 | if (!bs) { |
3706 | return QTAILQ_FIRST(&graph_bdrv_states); | |
02c50efe | 3707 | } |
61007b31 | 3708 | return QTAILQ_NEXT(bs, node_list); |
83f64091 FB |
3709 | } |
3710 | ||
61007b31 | 3711 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
83f64091 | 3712 | { |
61007b31 | 3713 | return bs->node_name; |
beac80cd FB |
3714 | } |
3715 | ||
1f0c461b | 3716 | const char *bdrv_get_parent_name(const BlockDriverState *bs) |
4c265bf9 KW |
3717 | { |
3718 | BdrvChild *c; | |
3719 | const char *name; | |
3720 | ||
3721 | /* If multiple parents have a name, just pick the first one. */ | |
3722 | QLIST_FOREACH(c, &bs->parents, next_parent) { | |
3723 | if (c->role->get_name) { | |
3724 | name = c->role->get_name(c); | |
3725 | if (name && *name) { | |
3726 | return name; | |
3727 | } | |
3728 | } | |
3729 | } | |
3730 | ||
3731 | return NULL; | |
3732 | } | |
3733 | ||
61007b31 SH |
3734 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
3735 | const char *bdrv_get_device_name(const BlockDriverState *bs) | |
beac80cd | 3736 | { |
4c265bf9 | 3737 | return bdrv_get_parent_name(bs) ?: ""; |
f141eafe | 3738 | } |
83f64091 | 3739 | |
61007b31 SH |
3740 | /* This can be used to identify nodes that might not have a device |
3741 | * name associated. Since node and device names live in the same | |
3742 | * namespace, the result is unambiguous. The exception is if both are | |
3743 | * absent, then this returns an empty (non-null) string. */ | |
3744 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) | |
f141eafe | 3745 | { |
4c265bf9 | 3746 | return bdrv_get_parent_name(bs) ?: bs->node_name; |
beac80cd | 3747 | } |
beac80cd | 3748 | |
61007b31 | 3749 | int bdrv_get_flags(BlockDriverState *bs) |
0b5a2445 | 3750 | { |
61007b31 | 3751 | return bs->open_flags; |
0b5a2445 PB |
3752 | } |
3753 | ||
61007b31 | 3754 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
68485420 | 3755 | { |
61007b31 | 3756 | return 1; |
0b5a2445 PB |
3757 | } |
3758 | ||
61007b31 | 3759 | int bdrv_has_zero_init(BlockDriverState *bs) |
0b5a2445 | 3760 | { |
61007b31 | 3761 | assert(bs->drv); |
0b5a2445 | 3762 | |
61007b31 SH |
3763 | /* If BS is a copy on write image, it is initialized to |
3764 | the contents of the base image, which may not be zeroes. */ | |
760e0063 | 3765 | if (bs->backing) { |
61007b31 SH |
3766 | return 0; |
3767 | } | |
3768 | if (bs->drv->bdrv_has_zero_init) { | |
3769 | return bs->drv->bdrv_has_zero_init(bs); | |
0b5a2445 | 3770 | } |
61007b31 SH |
3771 | |
3772 | /* safe default */ | |
3773 | return 0; | |
68485420 KW |
3774 | } |
3775 | ||
61007b31 | 3776 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
b2a61371 | 3777 | { |
61007b31 | 3778 | BlockDriverInfo bdi; |
b2a61371 | 3779 | |
760e0063 | 3780 | if (bs->backing) { |
61007b31 SH |
3781 | return false; |
3782 | } | |
3783 | ||
3784 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3785 | return bdi.unallocated_blocks_are_zero; | |
b2a61371 SH |
3786 | } |
3787 | ||
61007b31 | 3788 | return false; |
b2a61371 SH |
3789 | } |
3790 | ||
61007b31 | 3791 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
68485420 | 3792 | { |
61007b31 | 3793 | BlockDriverInfo bdi; |
68485420 | 3794 | |
2f0342ef | 3795 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
61007b31 SH |
3796 | return false; |
3797 | } | |
68485420 | 3798 | |
61007b31 SH |
3799 | if (bdrv_get_info(bs, &bdi) == 0) { |
3800 | return bdi.can_write_zeroes_with_unmap; | |
3801 | } | |
68485420 | 3802 | |
61007b31 | 3803 | return false; |
68485420 KW |
3804 | } |
3805 | ||
61007b31 | 3806 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
b2e12bc6 | 3807 | { |
760e0063 | 3808 | if (bs->backing && bs->backing->bs->encrypted) |
61007b31 SH |
3809 | return bs->backing_file; |
3810 | else if (bs->encrypted) | |
3811 | return bs->filename; | |
3812 | else | |
3813 | return NULL; | |
b2e12bc6 CH |
3814 | } |
3815 | ||
61007b31 SH |
3816 | void bdrv_get_backing_filename(BlockDriverState *bs, |
3817 | char *filename, int filename_size) | |
016f5cf6 | 3818 | { |
61007b31 SH |
3819 | pstrcpy(filename, filename_size, bs->backing_file); |
3820 | } | |
d318aea9 | 3821 | |
61007b31 SH |
3822 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3823 | { | |
3824 | BlockDriver *drv = bs->drv; | |
3825 | if (!drv) | |
3826 | return -ENOMEDIUM; | |
3827 | if (!drv->bdrv_get_info) | |
3828 | return -ENOTSUP; | |
3829 | memset(bdi, 0, sizeof(*bdi)); | |
3830 | return drv->bdrv_get_info(bs, bdi); | |
3831 | } | |
016f5cf6 | 3832 | |
61007b31 SH |
3833 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
3834 | { | |
3835 | BlockDriver *drv = bs->drv; | |
3836 | if (drv && drv->bdrv_get_specific_info) { | |
3837 | return drv->bdrv_get_specific_info(bs); | |
3838 | } | |
3839 | return NULL; | |
016f5cf6 AG |
3840 | } |
3841 | ||
a31939e6 | 3842 | void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event) |
4265d620 | 3843 | { |
61007b31 SH |
3844 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
3845 | return; | |
3846 | } | |
4265d620 | 3847 | |
61007b31 | 3848 | bs->drv->bdrv_debug_event(bs, event); |
4265d620 PB |
3849 | } |
3850 | ||
61007b31 SH |
3851 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
3852 | const char *tag) | |
4265d620 | 3853 | { |
61007b31 | 3854 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
9a4f4c31 | 3855 | bs = bs->file ? bs->file->bs : NULL; |
61007b31 | 3856 | } |
4265d620 | 3857 | |
61007b31 SH |
3858 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
3859 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3860 | } | |
4265d620 | 3861 | |
61007b31 | 3862 | return -ENOTSUP; |
4265d620 PB |
3863 | } |
3864 | ||
61007b31 | 3865 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
ea2384d3 | 3866 | { |
61007b31 | 3867 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
9a4f4c31 | 3868 | bs = bs->file ? bs->file->bs : NULL; |
61007b31 | 3869 | } |
ce1a14dc | 3870 | |
61007b31 SH |
3871 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
3872 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
3873 | } | |
3874 | ||
3875 | return -ENOTSUP; | |
eb852011 MA |
3876 | } |
3877 | ||
61007b31 | 3878 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
ce1a14dc | 3879 | { |
61007b31 | 3880 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
9a4f4c31 | 3881 | bs = bs->file ? bs->file->bs : NULL; |
61007b31 | 3882 | } |
ce1a14dc | 3883 | |
61007b31 SH |
3884 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3885 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3886 | } | |
ce1a14dc | 3887 | |
61007b31 | 3888 | return -ENOTSUP; |
f197fe2b FZ |
3889 | } |
3890 | ||
61007b31 | 3891 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
ce1a14dc | 3892 | { |
61007b31 | 3893 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
9a4f4c31 | 3894 | bs = bs->file ? bs->file->bs : NULL; |
f197fe2b | 3895 | } |
19cb3738 | 3896 | |
61007b31 SH |
3897 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
3898 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3899 | } | |
f9f05dc5 | 3900 | |
61007b31 SH |
3901 | return false; |
3902 | } | |
f9f05dc5 | 3903 | |
61007b31 SH |
3904 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3905 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3906 | * from a BDS as backing_file should not be done, as that may be relative to | |
3907 | * the CWD rather than the chain. */ | |
3908 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, | |
3909 | const char *backing_file) | |
f9f05dc5 | 3910 | { |
61007b31 SH |
3911 | char *filename_full = NULL; |
3912 | char *backing_file_full = NULL; | |
3913 | char *filename_tmp = NULL; | |
3914 | int is_protocol = 0; | |
3915 | BlockDriverState *curr_bs = NULL; | |
3916 | BlockDriverState *retval = NULL; | |
418661e0 | 3917 | Error *local_error = NULL; |
f9f05dc5 | 3918 | |
61007b31 SH |
3919 | if (!bs || !bs->drv || !backing_file) { |
3920 | return NULL; | |
f9f05dc5 KW |
3921 | } |
3922 | ||
61007b31 SH |
3923 | filename_full = g_malloc(PATH_MAX); |
3924 | backing_file_full = g_malloc(PATH_MAX); | |
3925 | filename_tmp = g_malloc(PATH_MAX); | |
f9f05dc5 | 3926 | |
61007b31 | 3927 | is_protocol = path_has_protocol(backing_file); |
f9f05dc5 | 3928 | |
760e0063 | 3929 | for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) { |
f9f05dc5 | 3930 | |
61007b31 SH |
3931 | /* If either of the filename paths is actually a protocol, then |
3932 | * compare unmodified paths; otherwise make paths relative */ | |
3933 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3934 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
760e0063 | 3935 | retval = curr_bs->backing->bs; |
61007b31 SH |
3936 | break; |
3937 | } | |
418661e0 JC |
3938 | /* Also check against the full backing filename for the image */ |
3939 | bdrv_get_full_backing_filename(curr_bs, backing_file_full, PATH_MAX, | |
3940 | &local_error); | |
3941 | if (local_error == NULL) { | |
3942 | if (strcmp(backing_file, backing_file_full) == 0) { | |
3943 | retval = curr_bs->backing->bs; | |
3944 | break; | |
3945 | } | |
3946 | } else { | |
3947 | error_free(local_error); | |
3948 | local_error = NULL; | |
3949 | } | |
61007b31 SH |
3950 | } else { |
3951 | /* If not an absolute filename path, make it relative to the current | |
3952 | * image's filename path */ | |
3953 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3954 | backing_file); | |
f9f05dc5 | 3955 | |
61007b31 SH |
3956 | /* We are going to compare absolute pathnames */ |
3957 | if (!realpath(filename_tmp, filename_full)) { | |
3958 | continue; | |
3959 | } | |
07f07615 | 3960 | |
61007b31 SH |
3961 | /* We need to make sure the backing filename we are comparing against |
3962 | * is relative to the current image filename (or absolute) */ | |
3963 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3964 | curr_bs->backing_file); | |
07f07615 | 3965 | |
61007b31 SH |
3966 | if (!realpath(filename_tmp, backing_file_full)) { |
3967 | continue; | |
3968 | } | |
eb489bb1 | 3969 | |
61007b31 | 3970 | if (strcmp(backing_file_full, filename_full) == 0) { |
760e0063 | 3971 | retval = curr_bs->backing->bs; |
61007b31 SH |
3972 | break; |
3973 | } | |
3974 | } | |
eb489bb1 KW |
3975 | } |
3976 | ||
61007b31 SH |
3977 | g_free(filename_full); |
3978 | g_free(backing_file_full); | |
3979 | g_free(filename_tmp); | |
3980 | return retval; | |
3981 | } | |
3982 | ||
61007b31 SH |
3983 | void bdrv_init(void) |
3984 | { | |
3985 | module_call_init(MODULE_INIT_BLOCK); | |
3986 | } | |
29cdb251 | 3987 | |
61007b31 SH |
3988 | void bdrv_init_with_whitelist(void) |
3989 | { | |
3990 | use_bdrv_whitelist = 1; | |
3991 | bdrv_init(); | |
07f07615 PB |
3992 | } |
3993 | ||
5a8a30db | 3994 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 3995 | { |
4417ab7a | 3996 | BdrvChild *child, *parent; |
9c5e6594 | 3997 | uint64_t perm, shared_perm; |
5a8a30db KW |
3998 | Error *local_err = NULL; |
3999 | int ret; | |
4000 | ||
3456a8d1 KW |
4001 | if (!bs->drv) { |
4002 | return; | |
4003 | } | |
4004 | ||
04c01a5c | 4005 | if (!(bs->open_flags & BDRV_O_INACTIVE)) { |
7ea2d269 AK |
4006 | return; |
4007 | } | |
7ea2d269 | 4008 | |
16e977d5 VSO |
4009 | QLIST_FOREACH(child, &bs->children, next) { |
4010 | bdrv_invalidate_cache(child->bs, &local_err); | |
0d1c5c91 | 4011 | if (local_err) { |
0d1c5c91 FZ |
4012 | error_propagate(errp, local_err); |
4013 | return; | |
4014 | } | |
5a8a30db | 4015 | } |
0d1c5c91 | 4016 | |
16e977d5 VSO |
4017 | bs->open_flags &= ~BDRV_O_INACTIVE; |
4018 | if (bs->drv->bdrv_invalidate_cache) { | |
4019 | bs->drv->bdrv_invalidate_cache(bs, &local_err); | |
0d1c5c91 FZ |
4020 | if (local_err) { |
4021 | bs->open_flags |= BDRV_O_INACTIVE; | |
4022 | error_propagate(errp, local_err); | |
4023 | return; | |
4024 | } | |
0f15423c | 4025 | } |
3456a8d1 | 4026 | |
5a8a30db KW |
4027 | ret = refresh_total_sectors(bs, bs->total_sectors); |
4028 | if (ret < 0) { | |
04c01a5c | 4029 | bs->open_flags |= BDRV_O_INACTIVE; |
5a8a30db KW |
4030 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
4031 | return; | |
4032 | } | |
4417ab7a | 4033 | |
9c5e6594 KW |
4034 | /* Update permissions, they may differ for inactive nodes */ |
4035 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); | |
4036 | ret = bdrv_check_perm(bs, perm, shared_perm, NULL, &local_err); | |
4037 | if (ret < 0) { | |
4038 | bs->open_flags |= BDRV_O_INACTIVE; | |
4039 | error_propagate(errp, local_err); | |
4040 | return; | |
4041 | } | |
4042 | bdrv_set_perm(bs, perm, shared_perm); | |
4043 | ||
4417ab7a KW |
4044 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
4045 | if (parent->role->activate) { | |
4046 | parent->role->activate(parent, &local_err); | |
4047 | if (local_err) { | |
4048 | error_propagate(errp, local_err); | |
4049 | return; | |
4050 | } | |
4051 | } | |
4052 | } | |
0f15423c AL |
4053 | } |
4054 | ||
5a8a30db | 4055 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c | 4056 | { |
7c8eece4 | 4057 | BlockDriverState *bs; |
5a8a30db | 4058 | Error *local_err = NULL; |
88be7b4b | 4059 | BdrvNextIterator it; |
0f15423c | 4060 | |
88be7b4b | 4061 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
ed78cda3 SH |
4062 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4063 | ||
4064 | aio_context_acquire(aio_context); | |
5a8a30db | 4065 | bdrv_invalidate_cache(bs, &local_err); |
ed78cda3 | 4066 | aio_context_release(aio_context); |
5a8a30db KW |
4067 | if (local_err) { |
4068 | error_propagate(errp, local_err); | |
4069 | return; | |
4070 | } | |
0f15423c AL |
4071 | } |
4072 | } | |
4073 | ||
aad0b7a0 FZ |
4074 | static int bdrv_inactivate_recurse(BlockDriverState *bs, |
4075 | bool setting_flag) | |
76b1c7fe | 4076 | { |
cfa1a572 | 4077 | BdrvChild *child, *parent; |
76b1c7fe KW |
4078 | int ret; |
4079 | ||
aad0b7a0 | 4080 | if (!setting_flag && bs->drv->bdrv_inactivate) { |
76b1c7fe KW |
4081 | ret = bs->drv->bdrv_inactivate(bs); |
4082 | if (ret < 0) { | |
4083 | return ret; | |
4084 | } | |
4085 | } | |
4086 | ||
7d5b5261 | 4087 | if (setting_flag && !(bs->open_flags & BDRV_O_INACTIVE)) { |
9c5e6594 KW |
4088 | uint64_t perm, shared_perm; |
4089 | ||
cfa1a572 KW |
4090 | QLIST_FOREACH(parent, &bs->parents, next_parent) { |
4091 | if (parent->role->inactivate) { | |
4092 | ret = parent->role->inactivate(parent); | |
4093 | if (ret < 0) { | |
cfa1a572 KW |
4094 | return ret; |
4095 | } | |
4096 | } | |
4097 | } | |
9c5e6594 | 4098 | |
7d5b5261 SH |
4099 | bs->open_flags |= BDRV_O_INACTIVE; |
4100 | ||
9c5e6594 KW |
4101 | /* Update permissions, they may differ for inactive nodes */ |
4102 | bdrv_get_cumulative_perm(bs, &perm, &shared_perm); | |
4103 | bdrv_check_perm(bs, perm, shared_perm, NULL, &error_abort); | |
4104 | bdrv_set_perm(bs, perm, shared_perm); | |
aad0b7a0 | 4105 | } |
38701b6a KW |
4106 | |
4107 | QLIST_FOREACH(child, &bs->children, next) { | |
4108 | ret = bdrv_inactivate_recurse(child->bs, setting_flag); | |
4109 | if (ret < 0) { | |
4110 | return ret; | |
4111 | } | |
4112 | } | |
4113 | ||
615b5dcf VSO |
4114 | /* At this point persistent bitmaps should be already stored by the format |
4115 | * driver */ | |
4116 | bdrv_release_persistent_dirty_bitmaps(bs); | |
4117 | ||
76b1c7fe KW |
4118 | return 0; |
4119 | } | |
4120 | ||
4121 | int bdrv_inactivate_all(void) | |
4122 | { | |
79720af6 | 4123 | BlockDriverState *bs = NULL; |
88be7b4b | 4124 | BdrvNextIterator it; |
aad0b7a0 FZ |
4125 | int ret = 0; |
4126 | int pass; | |
76b1c7fe | 4127 | |
88be7b4b | 4128 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
aad0b7a0 FZ |
4129 | aio_context_acquire(bdrv_get_aio_context(bs)); |
4130 | } | |
76b1c7fe | 4131 | |
aad0b7a0 FZ |
4132 | /* We do two passes of inactivation. The first pass calls to drivers' |
4133 | * .bdrv_inactivate callbacks recursively so all cache is flushed to disk; | |
4134 | * the second pass sets the BDRV_O_INACTIVE flag so that no further write | |
4135 | * is allowed. */ | |
4136 | for (pass = 0; pass < 2; pass++) { | |
88be7b4b | 4137 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
aad0b7a0 FZ |
4138 | ret = bdrv_inactivate_recurse(bs, pass); |
4139 | if (ret < 0) { | |
4140 | goto out; | |
4141 | } | |
76b1c7fe KW |
4142 | } |
4143 | } | |
4144 | ||
aad0b7a0 | 4145 | out: |
88be7b4b | 4146 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
aad0b7a0 FZ |
4147 | aio_context_release(bdrv_get_aio_context(bs)); |
4148 | } | |
4149 | ||
4150 | return ret; | |
76b1c7fe KW |
4151 | } |
4152 | ||
19cb3738 FB |
4153 | /**************************************************************/ |
4154 | /* removable device support */ | |
4155 | ||
4156 | /** | |
4157 | * Return TRUE if the media is present | |
4158 | */ | |
e031f750 | 4159 | bool bdrv_is_inserted(BlockDriverState *bs) |
19cb3738 FB |
4160 | { |
4161 | BlockDriver *drv = bs->drv; | |
28d7a789 | 4162 | BdrvChild *child; |
a1aff5bf | 4163 | |
e031f750 HR |
4164 | if (!drv) { |
4165 | return false; | |
4166 | } | |
28d7a789 HR |
4167 | if (drv->bdrv_is_inserted) { |
4168 | return drv->bdrv_is_inserted(bs); | |
4169 | } | |
4170 | QLIST_FOREACH(child, &bs->children, next) { | |
4171 | if (!bdrv_is_inserted(child->bs)) { | |
4172 | return false; | |
4173 | } | |
e031f750 | 4174 | } |
28d7a789 | 4175 | return true; |
19cb3738 FB |
4176 | } |
4177 | ||
4178 | /** | |
8e49ca46 MA |
4179 | * Return whether the media changed since the last call to this |
4180 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4181 | */ |
4182 | int bdrv_media_changed(BlockDriverState *bs) | |
4183 | { | |
4184 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4185 | |
8e49ca46 MA |
4186 | if (drv && drv->bdrv_media_changed) { |
4187 | return drv->bdrv_media_changed(bs); | |
4188 | } | |
4189 | return -ENOTSUP; | |
19cb3738 FB |
4190 | } |
4191 | ||
4192 | /** | |
4193 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4194 | */ | |
f36f3949 | 4195 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4196 | { |
4197 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4198 | |
822e1cd1 MA |
4199 | if (drv && drv->bdrv_eject) { |
4200 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 FB |
4201 | } |
4202 | } | |
4203 | ||
19cb3738 FB |
4204 | /** |
4205 | * Lock or unlock the media (if it is locked, the user won't be able | |
4206 | * to eject it manually). | |
4207 | */ | |
025e849a | 4208 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4209 | { |
4210 | BlockDriver *drv = bs->drv; | |
4211 | ||
025e849a | 4212 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4213 | |
025e849a MA |
4214 | if (drv && drv->bdrv_lock_medium) { |
4215 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4216 | } |
4217 | } | |
985a03b0 | 4218 | |
9fcb0251 FZ |
4219 | /* Get a reference to bs */ |
4220 | void bdrv_ref(BlockDriverState *bs) | |
4221 | { | |
4222 | bs->refcnt++; | |
4223 | } | |
4224 | ||
4225 | /* Release a previously grabbed reference to bs. | |
4226 | * If after releasing, reference count is zero, the BlockDriverState is | |
4227 | * deleted. */ | |
4228 | void bdrv_unref(BlockDriverState *bs) | |
4229 | { | |
9a4d5ca6 JC |
4230 | if (!bs) { |
4231 | return; | |
4232 | } | |
9fcb0251 FZ |
4233 | assert(bs->refcnt > 0); |
4234 | if (--bs->refcnt == 0) { | |
4235 | bdrv_delete(bs); | |
4236 | } | |
4237 | } | |
4238 | ||
fbe40ff7 FZ |
4239 | struct BdrvOpBlocker { |
4240 | Error *reason; | |
4241 | QLIST_ENTRY(BdrvOpBlocker) list; | |
4242 | }; | |
4243 | ||
4244 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
4245 | { | |
4246 | BdrvOpBlocker *blocker; | |
4247 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
4248 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
4249 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
57ef3f12 EH |
4250 | error_propagate(errp, error_copy(blocker->reason)); |
4251 | error_prepend(errp, "Node '%s' is busy: ", | |
4252 | bdrv_get_device_or_node_name(bs)); | |
fbe40ff7 FZ |
4253 | return true; |
4254 | } | |
4255 | return false; | |
4256 | } | |
4257 | ||
4258 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
4259 | { | |
4260 | BdrvOpBlocker *blocker; | |
4261 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
4262 | ||
5839e53b | 4263 | blocker = g_new0(BdrvOpBlocker, 1); |
fbe40ff7 FZ |
4264 | blocker->reason = reason; |
4265 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
4266 | } | |
4267 | ||
4268 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
4269 | { | |
4270 | BdrvOpBlocker *blocker, *next; | |
4271 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
4272 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
4273 | if (blocker->reason == reason) { | |
4274 | QLIST_REMOVE(blocker, list); | |
4275 | g_free(blocker); | |
4276 | } | |
4277 | } | |
4278 | } | |
4279 | ||
4280 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
4281 | { | |
4282 | int i; | |
4283 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
4284 | bdrv_op_block(bs, i, reason); | |
4285 | } | |
4286 | } | |
4287 | ||
4288 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
4289 | { | |
4290 | int i; | |
4291 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
4292 | bdrv_op_unblock(bs, i, reason); | |
4293 | } | |
4294 | } | |
4295 | ||
4296 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
4297 | { | |
4298 | int i; | |
4299 | ||
4300 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
4301 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
4302 | return false; | |
4303 | } | |
4304 | } | |
4305 | return true; | |
4306 | } | |
4307 | ||
d92ada22 LC |
4308 | void bdrv_img_create(const char *filename, const char *fmt, |
4309 | const char *base_filename, const char *base_fmt, | |
9217283d FZ |
4310 | char *options, uint64_t img_size, int flags, bool quiet, |
4311 | Error **errp) | |
f88e1a42 | 4312 | { |
83d0521a CL |
4313 | QemuOptsList *create_opts = NULL; |
4314 | QemuOpts *opts = NULL; | |
4315 | const char *backing_fmt, *backing_file; | |
4316 | int64_t size; | |
f88e1a42 | 4317 | BlockDriver *drv, *proto_drv; |
cc84d90f | 4318 | Error *local_err = NULL; |
f88e1a42 JS |
4319 | int ret = 0; |
4320 | ||
4321 | /* Find driver and parse its options */ | |
4322 | drv = bdrv_find_format(fmt); | |
4323 | if (!drv) { | |
71c79813 | 4324 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4325 | return; |
f88e1a42 JS |
4326 | } |
4327 | ||
b65a5e12 | 4328 | proto_drv = bdrv_find_protocol(filename, true, errp); |
f88e1a42 | 4329 | if (!proto_drv) { |
d92ada22 | 4330 | return; |
f88e1a42 JS |
4331 | } |
4332 | ||
c6149724 HR |
4333 | if (!drv->create_opts) { |
4334 | error_setg(errp, "Format driver '%s' does not support image creation", | |
4335 | drv->format_name); | |
4336 | return; | |
4337 | } | |
4338 | ||
4339 | if (!proto_drv->create_opts) { | |
4340 | error_setg(errp, "Protocol driver '%s' does not support image creation", | |
4341 | proto_drv->format_name); | |
4342 | return; | |
4343 | } | |
4344 | ||
c282e1fd CL |
4345 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
4346 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); | |
f88e1a42 JS |
4347 | |
4348 | /* Create parameter list with default values */ | |
83d0521a | 4349 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
39101f25 | 4350 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
f88e1a42 JS |
4351 | |
4352 | /* Parse -o options */ | |
4353 | if (options) { | |
dc523cd3 MA |
4354 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
4355 | if (local_err) { | |
4356 | error_report_err(local_err); | |
4357 | local_err = NULL; | |
83d0521a | 4358 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
f88e1a42 JS |
4359 | goto out; |
4360 | } | |
4361 | } | |
4362 | ||
4363 | if (base_filename) { | |
f43e47db | 4364 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
6be4194b | 4365 | if (local_err) { |
71c79813 LC |
4366 | error_setg(errp, "Backing file not supported for file format '%s'", |
4367 | fmt); | |
f88e1a42 JS |
4368 | goto out; |
4369 | } | |
4370 | } | |
4371 | ||
4372 | if (base_fmt) { | |
f43e47db | 4373 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
6be4194b | 4374 | if (local_err) { |
71c79813 LC |
4375 | error_setg(errp, "Backing file format not supported for file " |
4376 | "format '%s'", fmt); | |
f88e1a42 JS |
4377 | goto out; |
4378 | } | |
4379 | } | |
4380 | ||
83d0521a CL |
4381 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
4382 | if (backing_file) { | |
4383 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
4384 | error_setg(errp, "Error: Trying to create an image with the " |
4385 | "same filename as the backing file"); | |
792da93a JS |
4386 | goto out; |
4387 | } | |
4388 | } | |
4389 | ||
83d0521a | 4390 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
f88e1a42 | 4391 | |
6e6e55f5 JS |
4392 | /* The size for the image must always be specified, unless we have a backing |
4393 | * file and we have not been forbidden from opening it. */ | |
83d0521a | 4394 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
6e6e55f5 JS |
4395 | if (backing_file && !(flags & BDRV_O_NO_BACKING)) { |
4396 | BlockDriverState *bs; | |
4397 | char *full_backing = g_new0(char, PATH_MAX); | |
4398 | int back_flags; | |
4399 | QDict *backing_options = NULL; | |
4400 | ||
4401 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, | |
4402 | full_backing, PATH_MAX, | |
4403 | &local_err); | |
4404 | if (local_err) { | |
4405 | g_free(full_backing); | |
4406 | goto out; | |
4407 | } | |
29168018 | 4408 | |
6e6e55f5 JS |
4409 | /* backing files always opened read-only */ |
4410 | back_flags = flags; | |
4411 | back_flags &= ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4412 | |
6e6e55f5 JS |
4413 | if (backing_fmt) { |
4414 | backing_options = qdict_new(); | |
4415 | qdict_put_str(backing_options, "driver", backing_fmt); | |
4416 | } | |
e6641719 | 4417 | |
6e6e55f5 JS |
4418 | bs = bdrv_open(full_backing, NULL, backing_options, back_flags, |
4419 | &local_err); | |
4420 | g_free(full_backing); | |
4421 | if (!bs && size != -1) { | |
4422 | /* Couldn't open BS, but we have a size, so it's nonfatal */ | |
4423 | warn_reportf_err(local_err, | |
4424 | "Could not verify backing image. " | |
4425 | "This may become an error in future versions.\n"); | |
4426 | local_err = NULL; | |
4427 | } else if (!bs) { | |
4428 | /* Couldn't open bs, do not have size */ | |
4429 | error_append_hint(&local_err, | |
4430 | "Could not open backing image to determine size.\n"); | |
4431 | goto out; | |
4432 | } else { | |
4433 | if (size == -1) { | |
4434 | /* Opened BS, have no size */ | |
4435 | size = bdrv_getlength(bs); | |
4436 | if (size < 0) { | |
4437 | error_setg_errno(errp, -size, "Could not get size of '%s'", | |
4438 | backing_file); | |
4439 | bdrv_unref(bs); | |
4440 | goto out; | |
4441 | } | |
4442 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); | |
52bf1e72 | 4443 | } |
66f6b814 | 4444 | bdrv_unref(bs); |
f88e1a42 | 4445 | } |
6e6e55f5 JS |
4446 | } /* (backing_file && !(flags & BDRV_O_NO_BACKING)) */ |
4447 | ||
4448 | if (size == -1) { | |
4449 | error_setg(errp, "Image creation needs a size parameter"); | |
4450 | goto out; | |
f88e1a42 JS |
4451 | } |
4452 | ||
f382d43a | 4453 | if (!quiet) { |
fe646693 | 4454 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
43c5d8f8 | 4455 | qemu_opts_print(opts, " "); |
f382d43a MR |
4456 | puts(""); |
4457 | } | |
83d0521a | 4458 | |
c282e1fd | 4459 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 4460 | |
cc84d90f HR |
4461 | if (ret == -EFBIG) { |
4462 | /* This is generally a better message than whatever the driver would | |
4463 | * deliver (especially because of the cluster_size_hint), since that | |
4464 | * is most probably not much different from "image too large". */ | |
4465 | const char *cluster_size_hint = ""; | |
83d0521a | 4466 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 4467 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 4468 | } |
cc84d90f HR |
4469 | error_setg(errp, "The image size is too large for file format '%s'" |
4470 | "%s", fmt, cluster_size_hint); | |
4471 | error_free(local_err); | |
4472 | local_err = NULL; | |
f88e1a42 JS |
4473 | } |
4474 | ||
4475 | out: | |
83d0521a CL |
4476 | qemu_opts_del(opts); |
4477 | qemu_opts_free(create_opts); | |
621ff94d | 4478 | error_propagate(errp, local_err); |
f88e1a42 | 4479 | } |
85d126f3 SH |
4480 | |
4481 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
4482 | { | |
dcd04228 SH |
4483 | return bs->aio_context; |
4484 | } | |
4485 | ||
052a7572 FZ |
4486 | void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co) |
4487 | { | |
4488 | aio_co_enter(bdrv_get_aio_context(bs), co); | |
4489 | } | |
4490 | ||
e8a095da SH |
4491 | static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban) |
4492 | { | |
4493 | QLIST_REMOVE(ban, list); | |
4494 | g_free(ban); | |
4495 | } | |
4496 | ||
dcd04228 SH |
4497 | void bdrv_detach_aio_context(BlockDriverState *bs) |
4498 | { | |
e8a095da | 4499 | BdrvAioNotifier *baf, *baf_tmp; |
b97511c7 | 4500 | BdrvChild *child; |
33384421 | 4501 | |
dcd04228 SH |
4502 | if (!bs->drv) { |
4503 | return; | |
4504 | } | |
4505 | ||
e8a095da SH |
4506 | assert(!bs->walking_aio_notifiers); |
4507 | bs->walking_aio_notifiers = true; | |
4508 | QLIST_FOREACH_SAFE(baf, &bs->aio_notifiers, list, baf_tmp) { | |
4509 | if (baf->deleted) { | |
4510 | bdrv_do_remove_aio_context_notifier(baf); | |
4511 | } else { | |
4512 | baf->detach_aio_context(baf->opaque); | |
4513 | } | |
33384421 | 4514 | } |
e8a095da SH |
4515 | /* Never mind iterating again to check for ->deleted. bdrv_close() will |
4516 | * remove remaining aio notifiers if we aren't called again. | |
4517 | */ | |
4518 | bs->walking_aio_notifiers = false; | |
33384421 | 4519 | |
dcd04228 SH |
4520 | if (bs->drv->bdrv_detach_aio_context) { |
4521 | bs->drv->bdrv_detach_aio_context(bs); | |
4522 | } | |
b97511c7 HR |
4523 | QLIST_FOREACH(child, &bs->children, next) { |
4524 | bdrv_detach_aio_context(child->bs); | |
dcd04228 SH |
4525 | } |
4526 | ||
4527 | bs->aio_context = NULL; | |
4528 | } | |
4529 | ||
4530 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
4531 | AioContext *new_context) | |
4532 | { | |
e8a095da | 4533 | BdrvAioNotifier *ban, *ban_tmp; |
b97511c7 | 4534 | BdrvChild *child; |
33384421 | 4535 | |
dcd04228 SH |
4536 | if (!bs->drv) { |
4537 | return; | |
4538 | } | |
4539 | ||
4540 | bs->aio_context = new_context; | |
4541 | ||
b97511c7 HR |
4542 | QLIST_FOREACH(child, &bs->children, next) { |
4543 | bdrv_attach_aio_context(child->bs, new_context); | |
dcd04228 SH |
4544 | } |
4545 | if (bs->drv->bdrv_attach_aio_context) { | |
4546 | bs->drv->bdrv_attach_aio_context(bs, new_context); | |
4547 | } | |
33384421 | 4548 | |
e8a095da SH |
4549 | assert(!bs->walking_aio_notifiers); |
4550 | bs->walking_aio_notifiers = true; | |
4551 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_tmp) { | |
4552 | if (ban->deleted) { | |
4553 | bdrv_do_remove_aio_context_notifier(ban); | |
4554 | } else { | |
4555 | ban->attached_aio_context(new_context, ban->opaque); | |
4556 | } | |
33384421 | 4557 | } |
e8a095da | 4558 | bs->walking_aio_notifiers = false; |
dcd04228 SH |
4559 | } |
4560 | ||
4561 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) | |
4562 | { | |
aabf5910 | 4563 | AioContext *ctx = bdrv_get_aio_context(bs); |
c2b6428d | 4564 | |
aabf5910 FZ |
4565 | aio_disable_external(ctx); |
4566 | bdrv_parent_drained_begin(bs); | |
53ec73e2 | 4567 | bdrv_drain(bs); /* ensure there are no in-flight requests */ |
dcd04228 | 4568 | |
c2b6428d PB |
4569 | while (aio_poll(ctx, false)) { |
4570 | /* wait for all bottom halves to execute */ | |
4571 | } | |
4572 | ||
dcd04228 SH |
4573 | bdrv_detach_aio_context(bs); |
4574 | ||
4575 | /* This function executes in the old AioContext so acquire the new one in | |
4576 | * case it runs in a different thread. | |
4577 | */ | |
4578 | aio_context_acquire(new_context); | |
4579 | bdrv_attach_aio_context(bs, new_context); | |
aabf5910 FZ |
4580 | bdrv_parent_drained_end(bs); |
4581 | aio_enable_external(ctx); | |
dcd04228 | 4582 | aio_context_release(new_context); |
85d126f3 | 4583 | } |
d616b224 | 4584 | |
33384421 HR |
4585 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
4586 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
4587 | void (*detach_aio_context)(void *opaque), void *opaque) | |
4588 | { | |
4589 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); | |
4590 | *ban = (BdrvAioNotifier){ | |
4591 | .attached_aio_context = attached_aio_context, | |
4592 | .detach_aio_context = detach_aio_context, | |
4593 | .opaque = opaque | |
4594 | }; | |
4595 | ||
4596 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); | |
4597 | } | |
4598 | ||
4599 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
4600 | void (*attached_aio_context)(AioContext *, | |
4601 | void *), | |
4602 | void (*detach_aio_context)(void *), | |
4603 | void *opaque) | |
4604 | { | |
4605 | BdrvAioNotifier *ban, *ban_next; | |
4606 | ||
4607 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
4608 | if (ban->attached_aio_context == attached_aio_context && | |
4609 | ban->detach_aio_context == detach_aio_context && | |
e8a095da SH |
4610 | ban->opaque == opaque && |
4611 | ban->deleted == false) | |
33384421 | 4612 | { |
e8a095da SH |
4613 | if (bs->walking_aio_notifiers) { |
4614 | ban->deleted = true; | |
4615 | } else { | |
4616 | bdrv_do_remove_aio_context_notifier(ban); | |
4617 | } | |
33384421 HR |
4618 | return; |
4619 | } | |
4620 | } | |
4621 | ||
4622 | abort(); | |
4623 | } | |
4624 | ||
77485434 | 4625 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
8b13976d | 4626 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque) |
6f176b48 | 4627 | { |
c282e1fd | 4628 | if (!bs->drv->bdrv_amend_options) { |
6f176b48 HR |
4629 | return -ENOTSUP; |
4630 | } | |
8b13976d | 4631 | return bs->drv->bdrv_amend_options(bs, opts, status_cb, cb_opaque); |
6f176b48 | 4632 | } |
f6186f49 | 4633 | |
b5042a36 BC |
4634 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
4635 | * of block filter and by bdrv_is_first_non_filter. | |
4636 | * It is used to test if the given bs is the candidate or recurse more in the | |
4637 | * node graph. | |
212a5a8f | 4638 | */ |
b5042a36 | 4639 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 4640 | BlockDriverState *candidate) |
f6186f49 | 4641 | { |
b5042a36 BC |
4642 | /* return false if basic checks fails */ |
4643 | if (!bs || !bs->drv) { | |
212a5a8f | 4644 | return false; |
f6186f49 BC |
4645 | } |
4646 | ||
b5042a36 BC |
4647 | /* the code reached a non block filter driver -> check if the bs is |
4648 | * the same as the candidate. It's the recursion termination condition. | |
4649 | */ | |
4650 | if (!bs->drv->is_filter) { | |
4651 | return bs == candidate; | |
212a5a8f | 4652 | } |
b5042a36 | 4653 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 4654 | |
b5042a36 BC |
4655 | /* If the block filter recursion method is defined use it to recurse down |
4656 | * the node graph. | |
4657 | */ | |
4658 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 4659 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
4660 | } |
4661 | ||
b5042a36 BC |
4662 | /* the driver is a block filter but don't allow to recurse -> return false |
4663 | */ | |
4664 | return false; | |
f6186f49 BC |
4665 | } |
4666 | ||
212a5a8f BC |
4667 | /* This function checks if the candidate is the first non filter bs down it's |
4668 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
4669 | * from the top. Some filters can choose not to pass down the recursion. | |
4670 | */ | |
4671 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 4672 | { |
7c8eece4 | 4673 | BlockDriverState *bs; |
88be7b4b | 4674 | BdrvNextIterator it; |
212a5a8f BC |
4675 | |
4676 | /* walk down the bs forest recursively */ | |
88be7b4b | 4677 | for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { |
212a5a8f BC |
4678 | bool perm; |
4679 | ||
b5042a36 | 4680 | /* try to recurse in this top level bs */ |
e6dc8a1f | 4681 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
4682 | |
4683 | /* candidate is the first non filter */ | |
4684 | if (perm) { | |
4685 | return true; | |
4686 | } | |
4687 | } | |
4688 | ||
4689 | return false; | |
f6186f49 | 4690 | } |
09158f00 | 4691 | |
e12f3784 WC |
4692 | BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, |
4693 | const char *node_name, Error **errp) | |
09158f00 BC |
4694 | { |
4695 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5a7e7a0b SH |
4696 | AioContext *aio_context; |
4697 | ||
09158f00 BC |
4698 | if (!to_replace_bs) { |
4699 | error_setg(errp, "Node name '%s' not found", node_name); | |
4700 | return NULL; | |
4701 | } | |
4702 | ||
5a7e7a0b SH |
4703 | aio_context = bdrv_get_aio_context(to_replace_bs); |
4704 | aio_context_acquire(aio_context); | |
4705 | ||
09158f00 | 4706 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
5a7e7a0b SH |
4707 | to_replace_bs = NULL; |
4708 | goto out; | |
09158f00 BC |
4709 | } |
4710 | ||
4711 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
4712 | * most non filter in order to prevent data corruption. | |
4713 | * Another benefit is that this tests exclude backing files which are | |
4714 | * blocked by the backing blockers. | |
4715 | */ | |
e12f3784 | 4716 | if (!bdrv_recurse_is_first_non_filter(parent_bs, to_replace_bs)) { |
09158f00 | 4717 | error_setg(errp, "Only top most non filter can be replaced"); |
5a7e7a0b SH |
4718 | to_replace_bs = NULL; |
4719 | goto out; | |
09158f00 BC |
4720 | } |
4721 | ||
5a7e7a0b SH |
4722 | out: |
4723 | aio_context_release(aio_context); | |
09158f00 BC |
4724 | return to_replace_bs; |
4725 | } | |
448ad91d | 4726 | |
91af7014 HR |
4727 | static bool append_open_options(QDict *d, BlockDriverState *bs) |
4728 | { | |
4729 | const QDictEntry *entry; | |
9e700c1a | 4730 | QemuOptDesc *desc; |
260fecf1 | 4731 | BdrvChild *child; |
91af7014 | 4732 | bool found_any = false; |
260fecf1 | 4733 | const char *p; |
91af7014 HR |
4734 | |
4735 | for (entry = qdict_first(bs->options); entry; | |
4736 | entry = qdict_next(bs->options, entry)) | |
4737 | { | |
260fecf1 KW |
4738 | /* Exclude options for children */ |
4739 | QLIST_FOREACH(child, &bs->children, next) { | |
4740 | if (strstart(qdict_entry_key(entry), child->name, &p) | |
4741 | && (!*p || *p == '.')) | |
4742 | { | |
4743 | break; | |
4744 | } | |
4745 | } | |
4746 | if (child) { | |
9e700c1a | 4747 | continue; |
91af7014 | 4748 | } |
9e700c1a KW |
4749 | |
4750 | /* And exclude all non-driver-specific options */ | |
4751 | for (desc = bdrv_runtime_opts.desc; desc->name; desc++) { | |
4752 | if (!strcmp(qdict_entry_key(entry), desc->name)) { | |
4753 | break; | |
4754 | } | |
4755 | } | |
4756 | if (desc->name) { | |
4757 | continue; | |
4758 | } | |
4759 | ||
4760 | qobject_incref(qdict_entry_value(entry)); | |
4761 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); | |
4762 | found_any = true; | |
91af7014 HR |
4763 | } |
4764 | ||
4765 | return found_any; | |
4766 | } | |
4767 | ||
4768 | /* Updates the following BDS fields: | |
4769 | * - exact_filename: A filename which may be used for opening a block device | |
4770 | * which (mostly) equals the given BDS (even without any | |
4771 | * other options; so reading and writing must return the same | |
4772 | * results, but caching etc. may be different) | |
4773 | * - full_open_options: Options which, when given when opening a block device | |
4774 | * (without a filename), result in a BDS (mostly) | |
4775 | * equalling the given one | |
4776 | * - filename: If exact_filename is set, it is copied here. Otherwise, | |
4777 | * full_open_options is converted to a JSON object, prefixed with | |
4778 | * "json:" (for use through the JSON pseudo protocol) and put here. | |
4779 | */ | |
4780 | void bdrv_refresh_filename(BlockDriverState *bs) | |
4781 | { | |
4782 | BlockDriver *drv = bs->drv; | |
4783 | QDict *opts; | |
4784 | ||
4785 | if (!drv) { | |
4786 | return; | |
4787 | } | |
4788 | ||
4789 | /* This BDS's file name will most probably depend on its file's name, so | |
4790 | * refresh that first */ | |
4791 | if (bs->file) { | |
9a4f4c31 | 4792 | bdrv_refresh_filename(bs->file->bs); |
91af7014 HR |
4793 | } |
4794 | ||
4795 | if (drv->bdrv_refresh_filename) { | |
4796 | /* Obsolete information is of no use here, so drop the old file name | |
4797 | * information before refreshing it */ | |
4798 | bs->exact_filename[0] = '\0'; | |
4799 | if (bs->full_open_options) { | |
4800 | QDECREF(bs->full_open_options); | |
4801 | bs->full_open_options = NULL; | |
4802 | } | |
4803 | ||
4cdd01d3 KW |
4804 | opts = qdict_new(); |
4805 | append_open_options(opts, bs); | |
4806 | drv->bdrv_refresh_filename(bs, opts); | |
4807 | QDECREF(opts); | |
91af7014 HR |
4808 | } else if (bs->file) { |
4809 | /* Try to reconstruct valid information from the underlying file */ | |
4810 | bool has_open_options; | |
4811 | ||
4812 | bs->exact_filename[0] = '\0'; | |
4813 | if (bs->full_open_options) { | |
4814 | QDECREF(bs->full_open_options); | |
4815 | bs->full_open_options = NULL; | |
4816 | } | |
4817 | ||
4818 | opts = qdict_new(); | |
4819 | has_open_options = append_open_options(opts, bs); | |
4820 | ||
4821 | /* If no specific options have been given for this BDS, the filename of | |
4822 | * the underlying file should suffice for this one as well */ | |
9a4f4c31 KW |
4823 | if (bs->file->bs->exact_filename[0] && !has_open_options) { |
4824 | strcpy(bs->exact_filename, bs->file->bs->exact_filename); | |
91af7014 HR |
4825 | } |
4826 | /* Reconstructing the full options QDict is simple for most format block | |
4827 | * drivers, as long as the full options are known for the underlying | |
4828 | * file BDS. The full options QDict of that file BDS should somehow | |
4829 | * contain a representation of the filename, therefore the following | |
4830 | * suffices without querying the (exact_)filename of this BDS. */ | |
9a4f4c31 | 4831 | if (bs->file->bs->full_open_options) { |
46f5ac20 | 4832 | qdict_put_str(opts, "driver", drv->format_name); |
9a4f4c31 | 4833 | QINCREF(bs->file->bs->full_open_options); |
de6e7951 | 4834 | qdict_put(opts, "file", bs->file->bs->full_open_options); |
91af7014 HR |
4835 | |
4836 | bs->full_open_options = opts; | |
4837 | } else { | |
4838 | QDECREF(opts); | |
4839 | } | |
4840 | } else if (!bs->full_open_options && qdict_size(bs->options)) { | |
4841 | /* There is no underlying file BDS (at least referenced by BDS.file), | |
4842 | * so the full options QDict should be equal to the options given | |
4843 | * specifically for this block device when it was opened (plus the | |
4844 | * driver specification). | |
4845 | * Because those options don't change, there is no need to update | |
4846 | * full_open_options when it's already set. */ | |
4847 | ||
4848 | opts = qdict_new(); | |
4849 | append_open_options(opts, bs); | |
46f5ac20 | 4850 | qdict_put_str(opts, "driver", drv->format_name); |
91af7014 HR |
4851 | |
4852 | if (bs->exact_filename[0]) { | |
4853 | /* This may not work for all block protocol drivers (some may | |
4854 | * require this filename to be parsed), but we have to find some | |
4855 | * default solution here, so just include it. If some block driver | |
4856 | * does not support pure options without any filename at all or | |
4857 | * needs some special format of the options QDict, it needs to | |
4858 | * implement the driver-specific bdrv_refresh_filename() function. | |
4859 | */ | |
46f5ac20 | 4860 | qdict_put_str(opts, "filename", bs->exact_filename); |
91af7014 HR |
4861 | } |
4862 | ||
4863 | bs->full_open_options = opts; | |
4864 | } | |
4865 | ||
4866 | if (bs->exact_filename[0]) { | |
4867 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); | |
4868 | } else if (bs->full_open_options) { | |
4869 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); | |
4870 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", | |
4871 | qstring_get_str(json)); | |
4872 | QDECREF(json); | |
4873 | } | |
4874 | } | |
e06018ad WC |
4875 | |
4876 | /* | |
4877 | * Hot add/remove a BDS's child. So the user can take a child offline when | |
4878 | * it is broken and take a new child online | |
4879 | */ | |
4880 | void bdrv_add_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, | |
4881 | Error **errp) | |
4882 | { | |
4883 | ||
4884 | if (!parent_bs->drv || !parent_bs->drv->bdrv_add_child) { | |
4885 | error_setg(errp, "The node %s does not support adding a child", | |
4886 | bdrv_get_device_or_node_name(parent_bs)); | |
4887 | return; | |
4888 | } | |
4889 | ||
4890 | if (!QLIST_EMPTY(&child_bs->parents)) { | |
4891 | error_setg(errp, "The node %s already has a parent", | |
4892 | child_bs->node_name); | |
4893 | return; | |
4894 | } | |
4895 | ||
4896 | parent_bs->drv->bdrv_add_child(parent_bs, child_bs, errp); | |
4897 | } | |
4898 | ||
4899 | void bdrv_del_child(BlockDriverState *parent_bs, BdrvChild *child, Error **errp) | |
4900 | { | |
4901 | BdrvChild *tmp; | |
4902 | ||
4903 | if (!parent_bs->drv || !parent_bs->drv->bdrv_del_child) { | |
4904 | error_setg(errp, "The node %s does not support removing a child", | |
4905 | bdrv_get_device_or_node_name(parent_bs)); | |
4906 | return; | |
4907 | } | |
4908 | ||
4909 | QLIST_FOREACH(tmp, &parent_bs->children, next) { | |
4910 | if (tmp == child) { | |
4911 | break; | |
4912 | } | |
4913 | } | |
4914 | ||
4915 | if (!tmp) { | |
4916 | error_setg(errp, "The node %s does not have a child named %s", | |
4917 | bdrv_get_device_or_node_name(parent_bs), | |
4918 | bdrv_get_device_or_node_name(child->bs)); | |
4919 | return; | |
4920 | } | |
4921 | ||
4922 | parent_bs->drv->bdrv_del_child(parent_bs, child, errp); | |
4923 | } | |
67b792f5 VSO |
4924 | |
4925 | bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, | |
4926 | uint32_t granularity, Error **errp) | |
4927 | { | |
4928 | BlockDriver *drv = bs->drv; | |
4929 | ||
4930 | if (!drv) { | |
4931 | error_setg_errno(errp, ENOMEDIUM, | |
4932 | "Can't store persistent bitmaps to %s", | |
4933 | bdrv_get_device_or_node_name(bs)); | |
4934 | return false; | |
4935 | } | |
4936 | ||
4937 | if (!drv->bdrv_can_store_new_dirty_bitmap) { | |
4938 | error_setg_errno(errp, ENOTSUP, | |
4939 | "Can't store persistent bitmaps to %s", | |
4940 | bdrv_get_device_or_node_name(bs)); | |
4941 | return false; | |
4942 | } | |
4943 | ||
4944 | return drv->bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp); | |
4945 | } |