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Commit | Line | Data |
---|---|---|
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 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
fc01f7e7 | 37 | |
71e72a19 | 38 | #ifdef CONFIG_BSD |
7674e7bf FB |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
72cf2d4f | 42 | #include <sys/queue.h> |
c5e97233 | 43 | #ifndef __DragonFly__ |
7674e7bf FB |
44 | #include <sys/disk.h> |
45 | #endif | |
c5e97233 | 46 | #endif |
7674e7bf | 47 | |
49dc768d AL |
48 | #ifdef _WIN32 |
49 | #include <windows.h> | |
50 | #endif | |
51 | ||
e4654d2d FZ |
52 | struct BdrvDirtyBitmap { |
53 | HBitmap *bitmap; | |
54 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
55 | }; | |
56 | ||
1c9805a3 SH |
57 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
58 | ||
7d4b4ba5 | 59 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
63 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
64 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 65 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
66 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
69 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
70 | int64_t sector_num, int nb_sectors, | |
71 | QEMUIOVector *iov); | |
c5fbe571 | 72 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
1c9805a3 | 75 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
77 | BdrvRequestFlags flags); | |
b2a61371 SH |
78 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
79 | int64_t sector_num, | |
80 | QEMUIOVector *qiov, | |
81 | int nb_sectors, | |
d20d9b7c | 82 | BdrvRequestFlags flags, |
b2a61371 SH |
83 | BlockDriverCompletionFunc *cb, |
84 | void *opaque, | |
8c5873d6 | 85 | bool is_write); |
b2a61371 | 86 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 87 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 88 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 89 | |
1b7bdbc1 SH |
90 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
91 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 92 | |
8a22f02a SH |
93 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
94 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 95 | |
eb852011 MA |
96 | /* If non-zero, use only whitelisted block drivers */ |
97 | static int use_bdrv_whitelist; | |
98 | ||
9e0b22f4 SH |
99 | #ifdef _WIN32 |
100 | static int is_windows_drive_prefix(const char *filename) | |
101 | { | |
102 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
103 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
104 | filename[1] == ':'); | |
105 | } | |
106 | ||
107 | int is_windows_drive(const char *filename) | |
108 | { | |
109 | if (is_windows_drive_prefix(filename) && | |
110 | filename[2] == '\0') | |
111 | return 1; | |
112 | if (strstart(filename, "\\\\.\\", NULL) || | |
113 | strstart(filename, "//./", NULL)) | |
114 | return 1; | |
115 | return 0; | |
116 | } | |
117 | #endif | |
118 | ||
0563e191 | 119 | /* throttling disk I/O limits */ |
cc0681c4 BC |
120 | void bdrv_set_io_limits(BlockDriverState *bs, |
121 | ThrottleConfig *cfg) | |
98f90dba | 122 | { |
cc0681c4 | 123 | int i; |
98f90dba | 124 | |
cc0681c4 | 125 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 126 | |
cc0681c4 BC |
127 | for (i = 0; i < 2; i++) { |
128 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 129 | } |
cc0681c4 BC |
130 | } |
131 | ||
132 | /* this function drain all the throttled IOs */ | |
133 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
134 | { | |
135 | bool drained = false; | |
136 | bool enabled = bs->io_limits_enabled; | |
137 | int i; | |
138 | ||
139 | bs->io_limits_enabled = false; | |
140 | ||
141 | for (i = 0; i < 2; i++) { | |
142 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
143 | drained = true; | |
144 | } | |
145 | } | |
146 | ||
147 | bs->io_limits_enabled = enabled; | |
98f90dba | 148 | |
cc0681c4 | 149 | return drained; |
98f90dba ZYW |
150 | } |
151 | ||
cc0681c4 | 152 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 153 | { |
cc0681c4 | 154 | bs->io_limits_enabled = false; |
0563e191 | 155 | |
cc0681c4 BC |
156 | bdrv_start_throttled_reqs(bs); |
157 | ||
158 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
159 | } |
160 | ||
cc0681c4 | 161 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 162 | { |
cc0681c4 BC |
163 | BlockDriverState *bs = opaque; |
164 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
165 | } |
166 | ||
cc0681c4 | 167 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 168 | { |
cc0681c4 BC |
169 | BlockDriverState *bs = opaque; |
170 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
171 | } |
172 | ||
cc0681c4 BC |
173 | /* should be called before bdrv_set_io_limits if a limit is set */ |
174 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
175 | { | |
176 | assert(!bs->io_limits_enabled); | |
177 | throttle_init(&bs->throttle_state, | |
178 | QEMU_CLOCK_VIRTUAL, | |
179 | bdrv_throttle_read_timer_cb, | |
180 | bdrv_throttle_write_timer_cb, | |
181 | bs); | |
182 | bs->io_limits_enabled = true; | |
183 | } | |
184 | ||
185 | /* This function makes an IO wait if needed | |
186 | * | |
187 | * @nb_sectors: the number of sectors of the IO | |
188 | * @is_write: is the IO a write | |
189 | */ | |
98f90dba | 190 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
cc0681c4 BC |
191 | int nb_sectors, |
192 | bool is_write) | |
98f90dba | 193 | { |
cc0681c4 BC |
194 | /* does this io must wait */ |
195 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 196 | |
cc0681c4 BC |
197 | /* if must wait or any request of this type throttled queue the IO */ |
198 | if (must_wait || | |
199 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
200 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
201 | } |
202 | ||
cc0681c4 BC |
203 | /* the IO will be executed, do the accounting */ |
204 | throttle_account(&bs->throttle_state, | |
205 | is_write, | |
206 | nb_sectors * BDRV_SECTOR_SIZE); | |
98f90dba | 207 | |
cc0681c4 BC |
208 | /* if the next request must wait -> do nothing */ |
209 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
210 | return; | |
98f90dba ZYW |
211 | } |
212 | ||
cc0681c4 BC |
213 | /* else queue next request for execution */ |
214 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
215 | } |
216 | ||
9e0b22f4 SH |
217 | /* check if the path starts with "<protocol>:" */ |
218 | static int path_has_protocol(const char *path) | |
219 | { | |
947995c0 PB |
220 | const char *p; |
221 | ||
9e0b22f4 SH |
222 | #ifdef _WIN32 |
223 | if (is_windows_drive(path) || | |
224 | is_windows_drive_prefix(path)) { | |
225 | return 0; | |
226 | } | |
947995c0 PB |
227 | p = path + strcspn(path, ":/\\"); |
228 | #else | |
229 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
230 | #endif |
231 | ||
947995c0 | 232 | return *p == ':'; |
9e0b22f4 SH |
233 | } |
234 | ||
83f64091 | 235 | int path_is_absolute(const char *path) |
3b0d4f61 | 236 | { |
21664424 FB |
237 | #ifdef _WIN32 |
238 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 239 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 240 | return 1; |
f53f4da9 PB |
241 | } |
242 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 243 | #else |
f53f4da9 | 244 | return (*path == '/'); |
3b9f94e1 | 245 | #endif |
3b0d4f61 FB |
246 | } |
247 | ||
83f64091 FB |
248 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
249 | path to it by considering it is relative to base_path. URL are | |
250 | supported. */ | |
251 | void path_combine(char *dest, int dest_size, | |
252 | const char *base_path, | |
253 | const char *filename) | |
3b0d4f61 | 254 | { |
83f64091 FB |
255 | const char *p, *p1; |
256 | int len; | |
257 | ||
258 | if (dest_size <= 0) | |
259 | return; | |
260 | if (path_is_absolute(filename)) { | |
261 | pstrcpy(dest, dest_size, filename); | |
262 | } else { | |
263 | p = strchr(base_path, ':'); | |
264 | if (p) | |
265 | p++; | |
266 | else | |
267 | p = base_path; | |
3b9f94e1 FB |
268 | p1 = strrchr(base_path, '/'); |
269 | #ifdef _WIN32 | |
270 | { | |
271 | const char *p2; | |
272 | p2 = strrchr(base_path, '\\'); | |
273 | if (!p1 || p2 > p1) | |
274 | p1 = p2; | |
275 | } | |
276 | #endif | |
83f64091 FB |
277 | if (p1) |
278 | p1++; | |
279 | else | |
280 | p1 = base_path; | |
281 | if (p1 > p) | |
282 | p = p1; | |
283 | len = p - base_path; | |
284 | if (len > dest_size - 1) | |
285 | len = dest_size - 1; | |
286 | memcpy(dest, base_path, len); | |
287 | dest[len] = '\0'; | |
288 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 289 | } |
3b0d4f61 FB |
290 | } |
291 | ||
dc5a1371 PB |
292 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
293 | { | |
294 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
295 | pstrcpy(dest, sz, bs->backing_file); | |
296 | } else { | |
297 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
298 | } | |
299 | } | |
300 | ||
5efa9d5a | 301 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 302 | { |
8c5873d6 SH |
303 | /* Block drivers without coroutine functions need emulation */ |
304 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
305 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
306 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
307 | ||
f8c35c1d SH |
308 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
309 | * the block driver lacks aio we need to emulate that too. | |
310 | */ | |
f9f05dc5 KW |
311 | if (!bdrv->bdrv_aio_readv) { |
312 | /* add AIO emulation layer */ | |
313 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
314 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 315 | } |
83f64091 | 316 | } |
b2e12bc6 | 317 | |
8a22f02a | 318 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 319 | } |
b338082b FB |
320 | |
321 | /* create a new block device (by default it is empty) */ | |
322 | BlockDriverState *bdrv_new(const char *device_name) | |
323 | { | |
1b7bdbc1 | 324 | BlockDriverState *bs; |
b338082b | 325 | |
7267c094 | 326 | bs = g_malloc0(sizeof(BlockDriverState)); |
e4654d2d | 327 | QLIST_INIT(&bs->dirty_bitmaps); |
b338082b | 328 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 329 | if (device_name[0] != '\0') { |
1b7bdbc1 | 330 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 331 | } |
28a7282a | 332 | bdrv_iostatus_disable(bs); |
d7d512f6 | 333 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 334 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
335 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
336 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 337 | bs->refcnt = 1; |
d7d512f6 | 338 | |
b338082b FB |
339 | return bs; |
340 | } | |
341 | ||
d7d512f6 PB |
342 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
343 | { | |
344 | notifier_list_add(&bs->close_notifiers, notify); | |
345 | } | |
346 | ||
ea2384d3 FB |
347 | BlockDriver *bdrv_find_format(const char *format_name) |
348 | { | |
349 | BlockDriver *drv1; | |
8a22f02a SH |
350 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
351 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 352 | return drv1; |
8a22f02a | 353 | } |
ea2384d3 FB |
354 | } |
355 | return NULL; | |
356 | } | |
357 | ||
b64ec4e4 | 358 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 359 | { |
b64ec4e4 FZ |
360 | static const char *whitelist_rw[] = { |
361 | CONFIG_BDRV_RW_WHITELIST | |
362 | }; | |
363 | static const char *whitelist_ro[] = { | |
364 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
365 | }; |
366 | const char **p; | |
367 | ||
b64ec4e4 | 368 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 369 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 370 | } |
eb852011 | 371 | |
b64ec4e4 | 372 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
373 | if (!strcmp(drv->format_name, *p)) { |
374 | return 1; | |
375 | } | |
376 | } | |
b64ec4e4 FZ |
377 | if (read_only) { |
378 | for (p = whitelist_ro; *p; p++) { | |
379 | if (!strcmp(drv->format_name, *p)) { | |
380 | return 1; | |
381 | } | |
382 | } | |
383 | } | |
eb852011 MA |
384 | return 0; |
385 | } | |
386 | ||
b64ec4e4 FZ |
387 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
388 | bool read_only) | |
eb852011 MA |
389 | { |
390 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 391 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
392 | } |
393 | ||
5b7e1542 ZYW |
394 | typedef struct CreateCo { |
395 | BlockDriver *drv; | |
396 | char *filename; | |
397 | QEMUOptionParameter *options; | |
398 | int ret; | |
cc84d90f | 399 | Error *err; |
5b7e1542 ZYW |
400 | } CreateCo; |
401 | ||
402 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
403 | { | |
cc84d90f HR |
404 | Error *local_err = NULL; |
405 | int ret; | |
406 | ||
5b7e1542 ZYW |
407 | CreateCo *cco = opaque; |
408 | assert(cco->drv); | |
409 | ||
cc84d90f HR |
410 | ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err); |
411 | if (error_is_set(&local_err)) { | |
412 | error_propagate(&cco->err, local_err); | |
413 | } | |
414 | cco->ret = ret; | |
5b7e1542 ZYW |
415 | } |
416 | ||
0e7e1989 | 417 | int bdrv_create(BlockDriver *drv, const char* filename, |
cc84d90f | 418 | QEMUOptionParameter *options, Error **errp) |
ea2384d3 | 419 | { |
5b7e1542 ZYW |
420 | int ret; |
421 | ||
422 | Coroutine *co; | |
423 | CreateCo cco = { | |
424 | .drv = drv, | |
425 | .filename = g_strdup(filename), | |
426 | .options = options, | |
427 | .ret = NOT_DONE, | |
cc84d90f | 428 | .err = NULL, |
5b7e1542 ZYW |
429 | }; |
430 | ||
431 | if (!drv->bdrv_create) { | |
cc84d90f | 432 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
433 | ret = -ENOTSUP; |
434 | goto out; | |
5b7e1542 ZYW |
435 | } |
436 | ||
437 | if (qemu_in_coroutine()) { | |
438 | /* Fast-path if already in coroutine context */ | |
439 | bdrv_create_co_entry(&cco); | |
440 | } else { | |
441 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
442 | qemu_coroutine_enter(co, &cco); | |
443 | while (cco.ret == NOT_DONE) { | |
444 | qemu_aio_wait(); | |
445 | } | |
446 | } | |
447 | ||
448 | ret = cco.ret; | |
cc84d90f HR |
449 | if (ret < 0) { |
450 | if (error_is_set(&cco.err)) { | |
451 | error_propagate(errp, cco.err); | |
452 | } else { | |
453 | error_setg_errno(errp, -ret, "Could not create image"); | |
454 | } | |
455 | } | |
0e7e1989 | 456 | |
80168bff LC |
457 | out: |
458 | g_free(cco.filename); | |
5b7e1542 | 459 | return ret; |
ea2384d3 FB |
460 | } |
461 | ||
cc84d90f HR |
462 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options, |
463 | Error **errp) | |
84a12e66 CH |
464 | { |
465 | BlockDriver *drv; | |
cc84d90f HR |
466 | Error *local_err = NULL; |
467 | int ret; | |
84a12e66 | 468 | |
98289620 | 469 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 470 | if (drv == NULL) { |
cc84d90f | 471 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 472 | return -ENOENT; |
84a12e66 CH |
473 | } |
474 | ||
cc84d90f HR |
475 | ret = bdrv_create(drv, filename, options, &local_err); |
476 | if (error_is_set(&local_err)) { | |
477 | error_propagate(errp, local_err); | |
478 | } | |
479 | return ret; | |
84a12e66 CH |
480 | } |
481 | ||
eba25057 JM |
482 | /* |
483 | * Create a uniquely-named empty temporary file. | |
484 | * Return 0 upon success, otherwise a negative errno value. | |
485 | */ | |
486 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 487 | { |
eba25057 | 488 | #ifdef _WIN32 |
3b9f94e1 | 489 | char temp_dir[MAX_PATH]; |
eba25057 JM |
490 | /* GetTempFileName requires that its output buffer (4th param) |
491 | have length MAX_PATH or greater. */ | |
492 | assert(size >= MAX_PATH); | |
493 | return (GetTempPath(MAX_PATH, temp_dir) | |
494 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
495 | ? 0 : -GetLastError()); | |
d5249393 | 496 | #else |
67b915a5 | 497 | int fd; |
7ccfb2eb | 498 | const char *tmpdir; |
0badc1ee AJ |
499 | tmpdir = getenv("TMPDIR"); |
500 | if (!tmpdir) | |
501 | tmpdir = "/tmp"; | |
eba25057 JM |
502 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
503 | return -EOVERFLOW; | |
504 | } | |
ea2384d3 | 505 | fd = mkstemp(filename); |
fe235a06 DH |
506 | if (fd < 0) { |
507 | return -errno; | |
508 | } | |
509 | if (close(fd) != 0) { | |
510 | unlink(filename); | |
eba25057 JM |
511 | return -errno; |
512 | } | |
513 | return 0; | |
d5249393 | 514 | #endif |
eba25057 | 515 | } |
fc01f7e7 | 516 | |
84a12e66 CH |
517 | /* |
518 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
519 | * recognized as a host CDROM. | |
520 | */ | |
521 | static BlockDriver *find_hdev_driver(const char *filename) | |
522 | { | |
523 | int score_max = 0, score; | |
524 | BlockDriver *drv = NULL, *d; | |
525 | ||
526 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
527 | if (d->bdrv_probe_device) { | |
528 | score = d->bdrv_probe_device(filename); | |
529 | if (score > score_max) { | |
530 | score_max = score; | |
531 | drv = d; | |
532 | } | |
533 | } | |
534 | } | |
535 | ||
536 | return drv; | |
537 | } | |
538 | ||
98289620 KW |
539 | BlockDriver *bdrv_find_protocol(const char *filename, |
540 | bool allow_protocol_prefix) | |
83f64091 FB |
541 | { |
542 | BlockDriver *drv1; | |
543 | char protocol[128]; | |
1cec71e3 | 544 | int len; |
83f64091 | 545 | const char *p; |
19cb3738 | 546 | |
66f82cee KW |
547 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
548 | ||
39508e7a CH |
549 | /* |
550 | * XXX(hch): we really should not let host device detection | |
551 | * override an explicit protocol specification, but moving this | |
552 | * later breaks access to device names with colons in them. | |
553 | * Thanks to the brain-dead persistent naming schemes on udev- | |
554 | * based Linux systems those actually are quite common. | |
555 | */ | |
556 | drv1 = find_hdev_driver(filename); | |
557 | if (drv1) { | |
558 | return drv1; | |
559 | } | |
560 | ||
98289620 | 561 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 562 | return bdrv_find_format("file"); |
84a12e66 | 563 | } |
98289620 | 564 | |
9e0b22f4 SH |
565 | p = strchr(filename, ':'); |
566 | assert(p != NULL); | |
1cec71e3 AL |
567 | len = p - filename; |
568 | if (len > sizeof(protocol) - 1) | |
569 | len = sizeof(protocol) - 1; | |
570 | memcpy(protocol, filename, len); | |
571 | protocol[len] = '\0'; | |
8a22f02a | 572 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 573 | if (drv1->protocol_name && |
8a22f02a | 574 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 575 | return drv1; |
8a22f02a | 576 | } |
83f64091 FB |
577 | } |
578 | return NULL; | |
579 | } | |
580 | ||
f500a6d3 | 581 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 582 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 583 | { |
f500a6d3 | 584 | int score, score_max; |
f3a5d3f8 CH |
585 | BlockDriver *drv1, *drv; |
586 | uint8_t buf[2048]; | |
f500a6d3 | 587 | int ret = 0; |
f8ea0b00 | 588 | |
08a00559 | 589 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 590 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
591 | drv = bdrv_find_format("raw"); |
592 | if (!drv) { | |
34b5d2c6 | 593 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
594 | ret = -ENOENT; |
595 | } | |
596 | *pdrv = drv; | |
597 | return ret; | |
1a396859 | 598 | } |
f8ea0b00 | 599 | |
83f64091 | 600 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 601 | if (ret < 0) { |
34b5d2c6 HR |
602 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
603 | "format"); | |
c98ac35d SW |
604 | *pdrv = NULL; |
605 | return ret; | |
83f64091 FB |
606 | } |
607 | ||
ea2384d3 | 608 | score_max = 0; |
84a12e66 | 609 | drv = NULL; |
8a22f02a | 610 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
611 | if (drv1->bdrv_probe) { |
612 | score = drv1->bdrv_probe(buf, ret, filename); | |
613 | if (score > score_max) { | |
614 | score_max = score; | |
615 | drv = drv1; | |
616 | } | |
0849bf08 | 617 | } |
fc01f7e7 | 618 | } |
c98ac35d | 619 | if (!drv) { |
34b5d2c6 HR |
620 | error_setg(errp, "Could not determine image format: No compatible " |
621 | "driver found"); | |
c98ac35d SW |
622 | ret = -ENOENT; |
623 | } | |
624 | *pdrv = drv; | |
625 | return ret; | |
ea2384d3 FB |
626 | } |
627 | ||
51762288 SH |
628 | /** |
629 | * Set the current 'total_sectors' value | |
630 | */ | |
631 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
632 | { | |
633 | BlockDriver *drv = bs->drv; | |
634 | ||
396759ad NB |
635 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
636 | if (bs->sg) | |
637 | return 0; | |
638 | ||
51762288 SH |
639 | /* query actual device if possible, otherwise just trust the hint */ |
640 | if (drv->bdrv_getlength) { | |
641 | int64_t length = drv->bdrv_getlength(bs); | |
642 | if (length < 0) { | |
643 | return length; | |
644 | } | |
7e382003 | 645 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
646 | } |
647 | ||
648 | bs->total_sectors = hint; | |
649 | return 0; | |
650 | } | |
651 | ||
9e8f1835 PB |
652 | /** |
653 | * Set open flags for a given discard mode | |
654 | * | |
655 | * Return 0 on success, -1 if the discard mode was invalid. | |
656 | */ | |
657 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
658 | { | |
659 | *flags &= ~BDRV_O_UNMAP; | |
660 | ||
661 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
662 | /* do nothing */ | |
663 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
664 | *flags |= BDRV_O_UNMAP; | |
665 | } else { | |
666 | return -1; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
c3993cdc SH |
672 | /** |
673 | * Set open flags for a given cache mode | |
674 | * | |
675 | * Return 0 on success, -1 if the cache mode was invalid. | |
676 | */ | |
677 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
678 | { | |
679 | *flags &= ~BDRV_O_CACHE_MASK; | |
680 | ||
681 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
682 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
683 | } else if (!strcmp(mode, "directsync")) { |
684 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
685 | } else if (!strcmp(mode, "writeback")) { |
686 | *flags |= BDRV_O_CACHE_WB; | |
687 | } else if (!strcmp(mode, "unsafe")) { | |
688 | *flags |= BDRV_O_CACHE_WB; | |
689 | *flags |= BDRV_O_NO_FLUSH; | |
690 | } else if (!strcmp(mode, "writethrough")) { | |
691 | /* this is the default */ | |
692 | } else { | |
693 | return -1; | |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
53fec9d3 SH |
699 | /** |
700 | * The copy-on-read flag is actually a reference count so multiple users may | |
701 | * use the feature without worrying about clobbering its previous state. | |
702 | * Copy-on-read stays enabled until all users have called to disable it. | |
703 | */ | |
704 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
705 | { | |
706 | bs->copy_on_read++; | |
707 | } | |
708 | ||
709 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
710 | { | |
711 | assert(bs->copy_on_read > 0); | |
712 | bs->copy_on_read--; | |
713 | } | |
714 | ||
7b272452 KW |
715 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
716 | { | |
717 | int open_flags = flags | BDRV_O_CACHE_WB; | |
718 | ||
719 | /* | |
720 | * Clear flags that are internal to the block layer before opening the | |
721 | * image. | |
722 | */ | |
723 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
724 | ||
725 | /* | |
726 | * Snapshots should be writable. | |
727 | */ | |
728 | if (bs->is_temporary) { | |
729 | open_flags |= BDRV_O_RDWR; | |
730 | } | |
731 | ||
732 | return open_flags; | |
733 | } | |
734 | ||
57915332 KW |
735 | /* |
736 | * Common part for opening disk images and files | |
b6ad491a KW |
737 | * |
738 | * Removes all processed options from *options. | |
57915332 | 739 | */ |
f500a6d3 | 740 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 741 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
742 | { |
743 | int ret, open_flags; | |
035fccdf | 744 | const char *filename; |
34b5d2c6 | 745 | Error *local_err = NULL; |
57915332 KW |
746 | |
747 | assert(drv != NULL); | |
6405875c | 748 | assert(bs->file == NULL); |
707ff828 | 749 | assert(options != NULL && bs->options != options); |
57915332 | 750 | |
45673671 KW |
751 | if (file != NULL) { |
752 | filename = file->filename; | |
753 | } else { | |
754 | filename = qdict_get_try_str(options, "filename"); | |
755 | } | |
756 | ||
757 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); | |
28dcee10 | 758 | |
5d186eb0 KW |
759 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
760 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
761 | * and return immediately. */ | |
762 | if (file != NULL && drv->bdrv_file_open) { | |
763 | bdrv_swap(file, bs); | |
764 | return 0; | |
765 | } | |
766 | ||
57915332 | 767 | bs->open_flags = flags; |
57915332 | 768 | bs->buffer_alignment = 512; |
0d51b4de | 769 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
770 | open_flags = bdrv_open_flags(bs, flags); |
771 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
772 | ||
773 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
774 | error_setg(errp, |
775 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
776 | ? "Driver '%s' can only be used for read-only devices" | |
777 | : "Driver '%s' is not whitelisted", | |
778 | drv->format_name); | |
b64ec4e4 FZ |
779 | return -ENOTSUP; |
780 | } | |
57915332 | 781 | |
53fec9d3 | 782 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
783 | if (flags & BDRV_O_COPY_ON_READ) { |
784 | if (!bs->read_only) { | |
785 | bdrv_enable_copy_on_read(bs); | |
786 | } else { | |
787 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
788 | return -EINVAL; | |
789 | } | |
53fec9d3 SH |
790 | } |
791 | ||
c2ad1b0c KW |
792 | if (filename != NULL) { |
793 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
794 | } else { | |
795 | bs->filename[0] = '\0'; | |
796 | } | |
57915332 | 797 | |
57915332 | 798 | bs->drv = drv; |
7267c094 | 799 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 800 | |
03f541bd | 801 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 802 | |
66f82cee KW |
803 | /* Open the image, either directly or using a protocol */ |
804 | if (drv->bdrv_file_open) { | |
5d186eb0 | 805 | assert(file == NULL); |
030be321 | 806 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 807 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 808 | } else { |
2af5ef70 | 809 | if (file == NULL) { |
34b5d2c6 HR |
810 | error_setg(errp, "Can't use '%s' as a block driver for the " |
811 | "protocol level", drv->format_name); | |
2af5ef70 KW |
812 | ret = -EINVAL; |
813 | goto free_and_fail; | |
814 | } | |
f500a6d3 | 815 | bs->file = file; |
34b5d2c6 | 816 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
817 | } |
818 | ||
57915332 | 819 | if (ret < 0) { |
34b5d2c6 HR |
820 | if (error_is_set(&local_err)) { |
821 | error_propagate(errp, local_err); | |
2fa9aa59 DH |
822 | } else if (bs->filename[0]) { |
823 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
824 | } else { |
825 | error_setg_errno(errp, -ret, "Could not open image"); | |
826 | } | |
57915332 KW |
827 | goto free_and_fail; |
828 | } | |
829 | ||
51762288 SH |
830 | ret = refresh_total_sectors(bs, bs->total_sectors); |
831 | if (ret < 0) { | |
34b5d2c6 | 832 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 833 | goto free_and_fail; |
57915332 | 834 | } |
51762288 | 835 | |
57915332 KW |
836 | #ifndef _WIN32 |
837 | if (bs->is_temporary) { | |
d4cea8df DH |
838 | assert(bs->filename[0] != '\0'); |
839 | unlink(bs->filename); | |
57915332 KW |
840 | } |
841 | #endif | |
842 | return 0; | |
843 | ||
844 | free_and_fail: | |
f500a6d3 | 845 | bs->file = NULL; |
7267c094 | 846 | g_free(bs->opaque); |
57915332 KW |
847 | bs->opaque = NULL; |
848 | bs->drv = NULL; | |
849 | return ret; | |
850 | } | |
851 | ||
b6ce07aa KW |
852 | /* |
853 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
854 | * |
855 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
856 | * empty set of options. The reference to the QDict belongs to the block layer | |
857 | * after the call (even on failure), so if the caller intends to reuse the | |
858 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 859 | */ |
787e4a85 | 860 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
72daa72e HR |
861 | const char *reference, QDict *options, int flags, |
862 | Error **errp) | |
ea2384d3 | 863 | { |
72daa72e | 864 | BlockDriverState *bs = NULL; |
6db95603 | 865 | BlockDriver *drv; |
c2ad1b0c | 866 | const char *drvname; |
98289620 | 867 | bool allow_protocol_prefix = false; |
34b5d2c6 | 868 | Error *local_err = NULL; |
83f64091 FB |
869 | int ret; |
870 | ||
707ff828 KW |
871 | /* NULL means an empty set of options */ |
872 | if (options == NULL) { | |
873 | options = qdict_new(); | |
874 | } | |
875 | ||
72daa72e HR |
876 | if (reference) { |
877 | if (filename || qdict_size(options)) { | |
878 | error_setg(errp, "Cannot reference an existing block device with " | |
879 | "additional options or a new filename"); | |
880 | return -EINVAL; | |
881 | } | |
882 | QDECREF(options); | |
883 | ||
884 | bs = bdrv_find(reference); | |
885 | if (!bs) { | |
886 | error_setg(errp, "Cannot find block device '%s'", reference); | |
887 | return -ENODEV; | |
888 | } | |
889 | bdrv_ref(bs); | |
890 | *pbs = bs; | |
891 | return 0; | |
892 | } | |
893 | ||
83f64091 | 894 | bs = bdrv_new(""); |
707ff828 KW |
895 | bs->options = options; |
896 | options = qdict_clone_shallow(options); | |
897 | ||
035fccdf KW |
898 | /* Fetch the file name from the options QDict if necessary */ |
899 | if (!filename) { | |
900 | filename = qdict_get_try_str(options, "filename"); | |
901 | } else if (filename && !qdict_haskey(options, "filename")) { | |
902 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 903 | allow_protocol_prefix = true; |
035fccdf | 904 | } else { |
34b5d2c6 HR |
905 | error_setg(errp, "Can't specify 'file' and 'filename' options at the " |
906 | "same time"); | |
035fccdf KW |
907 | ret = -EINVAL; |
908 | goto fail; | |
909 | } | |
910 | ||
c2ad1b0c KW |
911 | /* Find the right block driver */ |
912 | drvname = qdict_get_try_str(options, "driver"); | |
913 | if (drvname) { | |
8f94a6e4 | 914 | drv = bdrv_find_format(drvname); |
34b5d2c6 HR |
915 | if (!drv) { |
916 | error_setg(errp, "Unknown driver '%s'", drvname); | |
917 | } | |
c2ad1b0c KW |
918 | qdict_del(options, "driver"); |
919 | } else if (filename) { | |
98289620 KW |
920 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
921 | if (!drv) { | |
34b5d2c6 | 922 | error_setg(errp, "Unknown protocol"); |
98289620 | 923 | } |
c2ad1b0c | 924 | } else { |
34b5d2c6 | 925 | error_setg(errp, "Must specify either driver or file"); |
c2ad1b0c KW |
926 | drv = NULL; |
927 | } | |
928 | ||
929 | if (!drv) { | |
34b5d2c6 | 930 | /* errp has been set already */ |
c2ad1b0c KW |
931 | ret = -ENOENT; |
932 | goto fail; | |
933 | } | |
934 | ||
935 | /* Parse the filename and open it */ | |
936 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d KW |
937 | drv->bdrv_parse_filename(filename, options, &local_err); |
938 | if (error_is_set(&local_err)) { | |
34b5d2c6 | 939 | error_propagate(errp, local_err); |
6963a30d KW |
940 | ret = -EINVAL; |
941 | goto fail; | |
942 | } | |
56d1b4d2 | 943 | qdict_del(options, "filename"); |
030be321 | 944 | } else if (drv->bdrv_needs_filename && !filename) { |
34b5d2c6 HR |
945 | error_setg(errp, "The '%s' block driver requires a file name", |
946 | drv->format_name); | |
c2ad1b0c KW |
947 | ret = -EINVAL; |
948 | goto fail; | |
6963a30d KW |
949 | } |
950 | ||
505d7583 HR |
951 | if (!drv->bdrv_file_open) { |
952 | ret = bdrv_open(bs, filename, options, flags, drv, &local_err); | |
953 | options = NULL; | |
954 | } else { | |
955 | ret = bdrv_open_common(bs, NULL, options, flags, drv, &local_err); | |
956 | } | |
83f64091 | 957 | if (ret < 0) { |
34b5d2c6 | 958 | error_propagate(errp, local_err); |
707ff828 KW |
959 | goto fail; |
960 | } | |
961 | ||
962 | /* Check if any unknown options were used */ | |
505d7583 | 963 | if (options && (qdict_size(options) != 0)) { |
707ff828 | 964 | const QDictEntry *entry = qdict_first(options); |
34b5d2c6 HR |
965 | error_setg(errp, "Block protocol '%s' doesn't support the option '%s'", |
966 | drv->format_name, entry->key); | |
707ff828 KW |
967 | ret = -EINVAL; |
968 | goto fail; | |
3b0d4f61 | 969 | } |
707ff828 KW |
970 | QDECREF(options); |
971 | ||
71d0770c | 972 | bs->growable = 1; |
83f64091 FB |
973 | *pbs = bs; |
974 | return 0; | |
707ff828 KW |
975 | |
976 | fail: | |
977 | QDECREF(options); | |
978 | if (!bs->drv) { | |
979 | QDECREF(bs->options); | |
980 | } | |
4f6fd349 | 981 | bdrv_unref(bs); |
707ff828 | 982 | return ret; |
83f64091 FB |
983 | } |
984 | ||
31ca6d07 KW |
985 | /* |
986 | * Opens the backing file for a BlockDriverState if not yet open | |
987 | * | |
988 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
989 | * empty set of options. The reference to the QDict is transferred to this | |
990 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
991 | * it needs to use QINCREF() before calling bdrv_file_open. | |
992 | */ | |
34b5d2c6 | 993 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 PB |
994 | { |
995 | char backing_filename[PATH_MAX]; | |
996 | int back_flags, ret; | |
997 | BlockDriver *back_drv = NULL; | |
34b5d2c6 | 998 | Error *local_err = NULL; |
9156df12 PB |
999 | |
1000 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1001 | QDECREF(options); |
9156df12 PB |
1002 | return 0; |
1003 | } | |
1004 | ||
31ca6d07 KW |
1005 | /* NULL means an empty set of options */ |
1006 | if (options == NULL) { | |
1007 | options = qdict_new(); | |
1008 | } | |
1009 | ||
9156df12 | 1010 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1011 | if (qdict_haskey(options, "file.filename")) { |
1012 | backing_filename[0] = '\0'; | |
1013 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1014 | QDECREF(options); |
9156df12 | 1015 | return 0; |
dbecebdd FZ |
1016 | } else { |
1017 | bdrv_get_full_backing_filename(bs, backing_filename, | |
1018 | sizeof(backing_filename)); | |
9156df12 PB |
1019 | } |
1020 | ||
1021 | bs->backing_hd = bdrv_new(""); | |
9156df12 PB |
1022 | |
1023 | if (bs->backing_format[0] != '\0') { | |
1024 | back_drv = bdrv_find_format(bs->backing_format); | |
1025 | } | |
1026 | ||
1027 | /* backing files always opened read-only */ | |
87a5debd TL |
1028 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | |
1029 | BDRV_O_COPY_ON_READ); | |
9156df12 | 1030 | |
31ca6d07 KW |
1031 | ret = bdrv_open(bs->backing_hd, |
1032 | *backing_filename ? backing_filename : NULL, options, | |
34b5d2c6 | 1033 | back_flags, back_drv, &local_err); |
9156df12 | 1034 | if (ret < 0) { |
4f6fd349 | 1035 | bdrv_unref(bs->backing_hd); |
9156df12 PB |
1036 | bs->backing_hd = NULL; |
1037 | bs->open_flags |= BDRV_O_NO_BACKING; | |
b04b6b6e FZ |
1038 | error_setg(errp, "Could not open backing file: %s", |
1039 | error_get_pretty(local_err)); | |
1040 | error_free(local_err); | |
9156df12 PB |
1041 | return ret; |
1042 | } | |
d80ac658 PF |
1043 | |
1044 | if (bs->backing_hd->file) { | |
1045 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), | |
1046 | bs->backing_hd->file->filename); | |
1047 | } | |
1048 | ||
9156df12 PB |
1049 | return 0; |
1050 | } | |
1051 | ||
da557aac HR |
1052 | /* |
1053 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1054 | * device's options. | |
1055 | * | |
1056 | * If force_raw is true, bdrv_file_open() will be used, thereby preventing any | |
1057 | * image format auto-detection. If it is false and a filename is given, | |
1058 | * bdrv_open() will be used for auto-detection. | |
1059 | * | |
1060 | * If allow_none is true, no image will be opened if filename is false and no | |
1061 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1062 | * | |
1063 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1064 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1065 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1066 | * BlockdevRef. | |
1067 | * | |
1068 | * The BlockdevRef will be removed from the options QDict. | |
1069 | */ | |
1070 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1071 | QDict *options, const char *bdref_key, int flags, | |
1072 | bool force_raw, bool allow_none, Error **errp) | |
1073 | { | |
1074 | QDict *image_options; | |
1075 | int ret; | |
1076 | char *bdref_key_dot; | |
1077 | const char *reference; | |
1078 | ||
1079 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); | |
1080 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1081 | g_free(bdref_key_dot); | |
1082 | ||
1083 | reference = qdict_get_try_str(options, bdref_key); | |
1084 | if (!filename && !reference && !qdict_size(image_options)) { | |
1085 | if (allow_none) { | |
1086 | ret = 0; | |
1087 | } else { | |
1088 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1089 | bdref_key); | |
1090 | ret = -EINVAL; | |
1091 | } | |
1092 | goto done; | |
1093 | } | |
1094 | ||
1095 | if (filename && !force_raw) { | |
1096 | /* If a filename is given and the block driver should be detected | |
1097 | automatically (instead of using none), use bdrv_open() in order to do | |
1098 | that auto-detection. */ | |
1099 | BlockDriverState *bs; | |
1100 | ||
1101 | if (reference) { | |
1102 | error_setg(errp, "Cannot reference an existing block device while " | |
1103 | "giving a filename"); | |
1104 | ret = -EINVAL; | |
1105 | goto done; | |
1106 | } | |
1107 | ||
1108 | bs = bdrv_new(""); | |
1109 | ret = bdrv_open(bs, filename, image_options, flags, NULL, errp); | |
1110 | if (ret < 0) { | |
1111 | bdrv_unref(bs); | |
1112 | } else { | |
1113 | *pbs = bs; | |
1114 | } | |
1115 | } else { | |
1116 | ret = bdrv_file_open(pbs, filename, reference, image_options, flags, | |
1117 | errp); | |
1118 | } | |
1119 | ||
1120 | done: | |
1121 | qdict_del(options, bdref_key); | |
1122 | return ret; | |
1123 | } | |
1124 | ||
b6ce07aa KW |
1125 | /* |
1126 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1127 | * |
1128 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1129 | * empty set of options. The reference to the QDict belongs to the block layer | |
1130 | * after the call (even on failure), so if the caller intends to reuse the | |
1131 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 1132 | */ |
de9c0cec | 1133 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
34b5d2c6 | 1134 | int flags, BlockDriver *drv, Error **errp) |
ea2384d3 | 1135 | { |
b6ce07aa | 1136 | int ret; |
89c9bc3d SW |
1137 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
1138 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 1139 | BlockDriverState *file = NULL; |
74fe54f2 | 1140 | const char *drvname; |
34b5d2c6 | 1141 | Error *local_err = NULL; |
712e7874 | 1142 | |
de9c0cec KW |
1143 | /* NULL means an empty set of options */ |
1144 | if (options == NULL) { | |
1145 | options = qdict_new(); | |
1146 | } | |
1147 | ||
1148 | bs->options = options; | |
b6ad491a | 1149 | options = qdict_clone_shallow(options); |
de9c0cec KW |
1150 | |
1151 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 1152 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
1153 | BlockDriverState *bs1; |
1154 | int64_t total_size; | |
91a073a9 | 1155 | BlockDriver *bdrv_qcow2; |
08b392e1 | 1156 | QEMUOptionParameter *create_options; |
9fd3171a | 1157 | QDict *snapshot_options; |
c2ad1b0c | 1158 | |
ea2384d3 FB |
1159 | /* if snapshot, we create a temporary backing file and open it |
1160 | instead of opening 'filename' directly */ | |
33e3963e | 1161 | |
9fd3171a | 1162 | /* Get the required size from the image */ |
ea2384d3 | 1163 | bs1 = bdrv_new(""); |
9fd3171a | 1164 | QINCREF(options); |
c9fbb99d KW |
1165 | ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING, |
1166 | drv, &local_err); | |
51d7c00c | 1167 | if (ret < 0) { |
4f6fd349 | 1168 | bdrv_unref(bs1); |
de9c0cec | 1169 | goto fail; |
ea2384d3 | 1170 | } |
3e82990b | 1171 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1172 | |
4f6fd349 | 1173 | bdrv_unref(bs1); |
3b46e624 | 1174 | |
9fd3171a | 1175 | /* Create the temporary image */ |
eba25057 JM |
1176 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1177 | if (ret < 0) { | |
34b5d2c6 | 1178 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
de9c0cec | 1179 | goto fail; |
eba25057 | 1180 | } |
7c96d46e | 1181 | |
91a073a9 | 1182 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1183 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1184 | NULL); | |
91a073a9 | 1185 | |
08b392e1 | 1186 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
91a073a9 | 1187 | |
cc84d90f | 1188 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err); |
08b392e1 | 1189 | free_option_parameters(create_options); |
51d7c00c | 1190 | if (ret < 0) { |
34b5d2c6 | 1191 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
cc84d90f HR |
1192 | "'%s': %s", tmp_filename, |
1193 | error_get_pretty(local_err)); | |
1194 | error_free(local_err); | |
1195 | local_err = NULL; | |
de9c0cec | 1196 | goto fail; |
ea2384d3 | 1197 | } |
91a073a9 | 1198 | |
9fd3171a KW |
1199 | /* Prepare a new options QDict for the temporary file, where user |
1200 | * options refer to the backing file */ | |
1201 | if (filename) { | |
1202 | qdict_put(options, "file.filename", qstring_from_str(filename)); | |
1203 | } | |
1204 | if (drv) { | |
1205 | qdict_put(options, "driver", qstring_from_str(drv->format_name)); | |
1206 | } | |
1207 | ||
1208 | snapshot_options = qdict_new(); | |
1209 | qdict_put(snapshot_options, "backing", options); | |
1210 | qdict_flatten(snapshot_options); | |
1211 | ||
1212 | bs->options = snapshot_options; | |
1213 | options = qdict_clone_shallow(bs->options); | |
1214 | ||
ea2384d3 | 1215 | filename = tmp_filename; |
91a073a9 | 1216 | drv = bdrv_qcow2; |
ea2384d3 FB |
1217 | bs->is_temporary = 1; |
1218 | } | |
712e7874 | 1219 | |
f500a6d3 KW |
1220 | /* Open image file without format layer */ |
1221 | if (flags & BDRV_O_RDWR) { | |
1222 | flags |= BDRV_O_ALLOW_RDWR; | |
1223 | } | |
1224 | ||
054963f8 HR |
1225 | ret = bdrv_open_image(&file, filename, options, "file", |
1226 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP), true, true, | |
1227 | &local_err); | |
1228 | if (ret < 0) { | |
1229 | goto fail; | |
f500a6d3 KW |
1230 | } |
1231 | ||
b6ce07aa | 1232 | /* Find the right image format driver */ |
74fe54f2 KW |
1233 | drvname = qdict_get_try_str(options, "driver"); |
1234 | if (drvname) { | |
8f94a6e4 | 1235 | drv = bdrv_find_format(drvname); |
74fe54f2 | 1236 | qdict_del(options, "driver"); |
06d22aa3 KW |
1237 | if (!drv) { |
1238 | error_setg(errp, "Invalid driver: '%s'", drvname); | |
1239 | ret = -EINVAL; | |
1240 | goto unlink_and_fail; | |
1241 | } | |
74fe54f2 KW |
1242 | } |
1243 | ||
6db95603 | 1244 | if (!drv) { |
2a05cbe4 HR |
1245 | if (file) { |
1246 | ret = find_image_format(file, filename, &drv, &local_err); | |
1247 | } else { | |
1248 | error_setg(errp, "Must specify either driver or file"); | |
1249 | ret = -EINVAL; | |
1250 | goto unlink_and_fail; | |
1251 | } | |
51d7c00c | 1252 | } |
6987307c | 1253 | |
51d7c00c | 1254 | if (!drv) { |
51d7c00c | 1255 | goto unlink_and_fail; |
ea2384d3 | 1256 | } |
b6ce07aa KW |
1257 | |
1258 | /* Open the image */ | |
34b5d2c6 | 1259 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1260 | if (ret < 0) { |
6987307c CH |
1261 | goto unlink_and_fail; |
1262 | } | |
1263 | ||
2a05cbe4 | 1264 | if (file && (bs->file != file)) { |
4f6fd349 | 1265 | bdrv_unref(file); |
f500a6d3 KW |
1266 | file = NULL; |
1267 | } | |
1268 | ||
b6ce07aa | 1269 | /* If there is a backing file, use it */ |
9156df12 | 1270 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1271 | QDict *backing_options; |
1272 | ||
5726d872 | 1273 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1274 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1275 | if (ret < 0) { |
b6ad491a | 1276 | goto close_and_fail; |
b6ce07aa | 1277 | } |
b6ce07aa KW |
1278 | } |
1279 | ||
b6ad491a KW |
1280 | /* Check if any unknown options were used */ |
1281 | if (qdict_size(options) != 0) { | |
1282 | const QDictEntry *entry = qdict_first(options); | |
34b5d2c6 HR |
1283 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
1284 | "support the option '%s'", drv->format_name, bs->device_name, | |
1285 | entry->key); | |
b6ad491a KW |
1286 | |
1287 | ret = -EINVAL; | |
1288 | goto close_and_fail; | |
1289 | } | |
1290 | QDECREF(options); | |
1291 | ||
b6ce07aa | 1292 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1293 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1294 | } |
1295 | ||
1296 | return 0; | |
1297 | ||
1298 | unlink_and_fail: | |
f500a6d3 | 1299 | if (file != NULL) { |
4f6fd349 | 1300 | bdrv_unref(file); |
f500a6d3 | 1301 | } |
b6ce07aa KW |
1302 | if (bs->is_temporary) { |
1303 | unlink(filename); | |
1304 | } | |
de9c0cec KW |
1305 | fail: |
1306 | QDECREF(bs->options); | |
b6ad491a | 1307 | QDECREF(options); |
de9c0cec | 1308 | bs->options = NULL; |
34b5d2c6 HR |
1309 | if (error_is_set(&local_err)) { |
1310 | error_propagate(errp, local_err); | |
1311 | } | |
b6ad491a | 1312 | return ret; |
de9c0cec | 1313 | |
b6ad491a KW |
1314 | close_and_fail: |
1315 | bdrv_close(bs); | |
1316 | QDECREF(options); | |
34b5d2c6 HR |
1317 | if (error_is_set(&local_err)) { |
1318 | error_propagate(errp, local_err); | |
1319 | } | |
b6ce07aa KW |
1320 | return ret; |
1321 | } | |
1322 | ||
e971aa12 JC |
1323 | typedef struct BlockReopenQueueEntry { |
1324 | bool prepared; | |
1325 | BDRVReopenState state; | |
1326 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1327 | } BlockReopenQueueEntry; | |
1328 | ||
1329 | /* | |
1330 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1331 | * reopen of multiple devices. | |
1332 | * | |
1333 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1334 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1335 | * be created and initialized. This newly created BlockReopenQueue should be | |
1336 | * passed back in for subsequent calls that are intended to be of the same | |
1337 | * atomic 'set'. | |
1338 | * | |
1339 | * bs is the BlockDriverState to add to the reopen queue. | |
1340 | * | |
1341 | * flags contains the open flags for the associated bs | |
1342 | * | |
1343 | * returns a pointer to bs_queue, which is either the newly allocated | |
1344 | * bs_queue, or the existing bs_queue being used. | |
1345 | * | |
1346 | */ | |
1347 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1348 | BlockDriverState *bs, int flags) | |
1349 | { | |
1350 | assert(bs != NULL); | |
1351 | ||
1352 | BlockReopenQueueEntry *bs_entry; | |
1353 | if (bs_queue == NULL) { | |
1354 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1355 | QSIMPLEQ_INIT(bs_queue); | |
1356 | } | |
1357 | ||
1358 | if (bs->file) { | |
1359 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1360 | } | |
1361 | ||
1362 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1363 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1364 | ||
1365 | bs_entry->state.bs = bs; | |
1366 | bs_entry->state.flags = flags; | |
1367 | ||
1368 | return bs_queue; | |
1369 | } | |
1370 | ||
1371 | /* | |
1372 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1373 | * | |
1374 | * The queue passed in (bs_queue) must have been built up previous | |
1375 | * via bdrv_reopen_queue(). | |
1376 | * | |
1377 | * Reopens all BDS specified in the queue, with the appropriate | |
1378 | * flags. All devices are prepared for reopen, and failure of any | |
1379 | * device will cause all device changes to be abandonded, and intermediate | |
1380 | * data cleaned up. | |
1381 | * | |
1382 | * If all devices prepare successfully, then the changes are committed | |
1383 | * to all devices. | |
1384 | * | |
1385 | */ | |
1386 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1387 | { | |
1388 | int ret = -1; | |
1389 | BlockReopenQueueEntry *bs_entry, *next; | |
1390 | Error *local_err = NULL; | |
1391 | ||
1392 | assert(bs_queue != NULL); | |
1393 | ||
1394 | bdrv_drain_all(); | |
1395 | ||
1396 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1397 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1398 | error_propagate(errp, local_err); | |
1399 | goto cleanup; | |
1400 | } | |
1401 | bs_entry->prepared = true; | |
1402 | } | |
1403 | ||
1404 | /* If we reach this point, we have success and just need to apply the | |
1405 | * changes | |
1406 | */ | |
1407 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1408 | bdrv_reopen_commit(&bs_entry->state); | |
1409 | } | |
1410 | ||
1411 | ret = 0; | |
1412 | ||
1413 | cleanup: | |
1414 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1415 | if (ret && bs_entry->prepared) { | |
1416 | bdrv_reopen_abort(&bs_entry->state); | |
1417 | } | |
1418 | g_free(bs_entry); | |
1419 | } | |
1420 | g_free(bs_queue); | |
1421 | return ret; | |
1422 | } | |
1423 | ||
1424 | ||
1425 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1426 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1427 | { | |
1428 | int ret = -1; | |
1429 | Error *local_err = NULL; | |
1430 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1431 | ||
1432 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1433 | if (local_err != NULL) { | |
1434 | error_propagate(errp, local_err); | |
1435 | } | |
1436 | return ret; | |
1437 | } | |
1438 | ||
1439 | ||
1440 | /* | |
1441 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1442 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1443 | * the block driver layer .bdrv_reopen_prepare() | |
1444 | * | |
1445 | * bs is the BlockDriverState to reopen | |
1446 | * flags are the new open flags | |
1447 | * queue is the reopen queue | |
1448 | * | |
1449 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1450 | * as well. | |
1451 | * | |
1452 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1453 | * It is the responsibility of the caller to then call the abort() or | |
1454 | * commit() for any other BDS that have been left in a prepare() state | |
1455 | * | |
1456 | */ | |
1457 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1458 | Error **errp) | |
1459 | { | |
1460 | int ret = -1; | |
1461 | Error *local_err = NULL; | |
1462 | BlockDriver *drv; | |
1463 | ||
1464 | assert(reopen_state != NULL); | |
1465 | assert(reopen_state->bs->drv != NULL); | |
1466 | drv = reopen_state->bs->drv; | |
1467 | ||
1468 | /* if we are to stay read-only, do not allow permission change | |
1469 | * to r/w */ | |
1470 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1471 | reopen_state->flags & BDRV_O_RDWR) { | |
1472 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1473 | reopen_state->bs->device_name); | |
1474 | goto error; | |
1475 | } | |
1476 | ||
1477 | ||
1478 | ret = bdrv_flush(reopen_state->bs); | |
1479 | if (ret) { | |
1480 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1481 | strerror(-ret)); | |
1482 | goto error; | |
1483 | } | |
1484 | ||
1485 | if (drv->bdrv_reopen_prepare) { | |
1486 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1487 | if (ret) { | |
1488 | if (local_err != NULL) { | |
1489 | error_propagate(errp, local_err); | |
1490 | } else { | |
d8b6895f LC |
1491 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1492 | reopen_state->bs->filename); | |
e971aa12 JC |
1493 | } |
1494 | goto error; | |
1495 | } | |
1496 | } else { | |
1497 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1498 | * handler for each supported drv. */ | |
1499 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1500 | drv->format_name, reopen_state->bs->device_name, | |
1501 | "reopening of file"); | |
1502 | ret = -1; | |
1503 | goto error; | |
1504 | } | |
1505 | ||
1506 | ret = 0; | |
1507 | ||
1508 | error: | |
1509 | return ret; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1514 | * makes them final by swapping the staging BlockDriverState contents into | |
1515 | * the active BlockDriverState contents. | |
1516 | */ | |
1517 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1518 | { | |
1519 | BlockDriver *drv; | |
1520 | ||
1521 | assert(reopen_state != NULL); | |
1522 | drv = reopen_state->bs->drv; | |
1523 | assert(drv != NULL); | |
1524 | ||
1525 | /* If there are any driver level actions to take */ | |
1526 | if (drv->bdrv_reopen_commit) { | |
1527 | drv->bdrv_reopen_commit(reopen_state); | |
1528 | } | |
1529 | ||
1530 | /* set BDS specific flags now */ | |
1531 | reopen_state->bs->open_flags = reopen_state->flags; | |
1532 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1533 | BDRV_O_CACHE_WB); | |
1534 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Abort the reopen, and delete and free the staged changes in | |
1539 | * reopen_state | |
1540 | */ | |
1541 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1542 | { | |
1543 | BlockDriver *drv; | |
1544 | ||
1545 | assert(reopen_state != NULL); | |
1546 | drv = reopen_state->bs->drv; | |
1547 | assert(drv != NULL); | |
1548 | ||
1549 | if (drv->bdrv_reopen_abort) { | |
1550 | drv->bdrv_reopen_abort(reopen_state); | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | ||
fc01f7e7 FB |
1555 | void bdrv_close(BlockDriverState *bs) |
1556 | { | |
3cbc002c PB |
1557 | if (bs->job) { |
1558 | block_job_cancel_sync(bs->job); | |
1559 | } | |
58fda173 SH |
1560 | bdrv_drain_all(); /* complete I/O */ |
1561 | bdrv_flush(bs); | |
1562 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1563 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1564 | |
3cbc002c | 1565 | if (bs->drv) { |
557df6ac | 1566 | if (bs->backing_hd) { |
4f6fd349 | 1567 | bdrv_unref(bs->backing_hd); |
557df6ac SH |
1568 | bs->backing_hd = NULL; |
1569 | } | |
ea2384d3 | 1570 | bs->drv->bdrv_close(bs); |
7267c094 | 1571 | g_free(bs->opaque); |
ea2384d3 FB |
1572 | #ifdef _WIN32 |
1573 | if (bs->is_temporary) { | |
1574 | unlink(bs->filename); | |
1575 | } | |
67b915a5 | 1576 | #endif |
ea2384d3 FB |
1577 | bs->opaque = NULL; |
1578 | bs->drv = NULL; | |
53fec9d3 | 1579 | bs->copy_on_read = 0; |
a275fa42 PB |
1580 | bs->backing_file[0] = '\0'; |
1581 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1582 | bs->total_sectors = 0; |
1583 | bs->encrypted = 0; | |
1584 | bs->valid_key = 0; | |
1585 | bs->sg = 0; | |
1586 | bs->growable = 0; | |
0d51b4de | 1587 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1588 | QDECREF(bs->options); |
1589 | bs->options = NULL; | |
b338082b | 1590 | |
66f82cee | 1591 | if (bs->file != NULL) { |
4f6fd349 | 1592 | bdrv_unref(bs->file); |
0ac9377d | 1593 | bs->file = NULL; |
66f82cee | 1594 | } |
b338082b | 1595 | } |
98f90dba | 1596 | |
9ca11154 PH |
1597 | bdrv_dev_change_media_cb(bs, false); |
1598 | ||
98f90dba ZYW |
1599 | /*throttling disk I/O limits*/ |
1600 | if (bs->io_limits_enabled) { | |
1601 | bdrv_io_limits_disable(bs); | |
1602 | } | |
b338082b FB |
1603 | } |
1604 | ||
2bc93fed MK |
1605 | void bdrv_close_all(void) |
1606 | { | |
1607 | BlockDriverState *bs; | |
1608 | ||
1609 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1610 | bdrv_close(bs); | |
1611 | } | |
1612 | } | |
1613 | ||
88266f5a SH |
1614 | /* Check if any requests are in-flight (including throttled requests) */ |
1615 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1616 | { | |
1617 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1618 | return true; | |
1619 | } | |
cc0681c4 BC |
1620 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1621 | return true; | |
1622 | } | |
1623 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1624 | return true; |
1625 | } | |
1626 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1627 | return true; | |
1628 | } | |
1629 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1630 | return true; | |
1631 | } | |
1632 | return false; | |
1633 | } | |
1634 | ||
1635 | static bool bdrv_requests_pending_all(void) | |
1636 | { | |
1637 | BlockDriverState *bs; | |
1638 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1639 | if (bdrv_requests_pending(bs)) { | |
1640 | return true; | |
1641 | } | |
1642 | } | |
1643 | return false; | |
1644 | } | |
1645 | ||
922453bc SH |
1646 | /* |
1647 | * Wait for pending requests to complete across all BlockDriverStates | |
1648 | * | |
1649 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1650 | * after calling this function. | |
4c355d53 ZYW |
1651 | * |
1652 | * Note that completion of an asynchronous I/O operation can trigger any | |
1653 | * number of other I/O operations on other devices---for example a coroutine | |
1654 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1655 | * coroutine is complete. Because of this, it is not possible to have a | |
1656 | * function to drain a single device's I/O queue. | |
922453bc SH |
1657 | */ |
1658 | void bdrv_drain_all(void) | |
1659 | { | |
88266f5a SH |
1660 | /* Always run first iteration so any pending completion BHs run */ |
1661 | bool busy = true; | |
922453bc SH |
1662 | BlockDriverState *bs; |
1663 | ||
88266f5a | 1664 | while (busy) { |
4c355d53 | 1665 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
0b06ef3b | 1666 | bdrv_start_throttled_reqs(bs); |
4c355d53 | 1667 | } |
922453bc | 1668 | |
88266f5a SH |
1669 | busy = bdrv_requests_pending_all(); |
1670 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1671 | } |
1672 | } | |
1673 | ||
d22b2f41 RH |
1674 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1675 | Also, NULL terminate the device_name to prevent double remove */ | |
1676 | void bdrv_make_anon(BlockDriverState *bs) | |
1677 | { | |
1678 | if (bs->device_name[0] != '\0') { | |
1679 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1680 | } | |
1681 | bs->device_name[0] = '\0'; | |
1682 | } | |
1683 | ||
e023b2e2 PB |
1684 | static void bdrv_rebind(BlockDriverState *bs) |
1685 | { | |
1686 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1687 | bs->drv->bdrv_rebind(bs); | |
1688 | } | |
1689 | } | |
1690 | ||
4ddc07ca PB |
1691 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1692 | BlockDriverState *bs_src) | |
8802d1fd | 1693 | { |
4ddc07ca PB |
1694 | /* move some fields that need to stay attached to the device */ |
1695 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1696 | |
1697 | /* dev info */ | |
4ddc07ca PB |
1698 | bs_dest->dev_ops = bs_src->dev_ops; |
1699 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1700 | bs_dest->dev = bs_src->dev; | |
1701 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1702 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1703 | |
4ddc07ca | 1704 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1705 | |
cc0681c4 BC |
1706 | /* i/o throttled req */ |
1707 | memcpy(&bs_dest->throttle_state, | |
1708 | &bs_src->throttle_state, | |
1709 | sizeof(ThrottleState)); | |
1710 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1711 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1712 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1713 | |
8802d1fd | 1714 | /* r/w error */ |
4ddc07ca PB |
1715 | bs_dest->on_read_error = bs_src->on_read_error; |
1716 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1717 | |
1718 | /* i/o status */ | |
4ddc07ca PB |
1719 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1720 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1721 | |
a9fc4408 | 1722 | /* dirty bitmap */ |
e4654d2d | 1723 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 1724 | |
9fcb0251 FZ |
1725 | /* reference count */ |
1726 | bs_dest->refcnt = bs_src->refcnt; | |
1727 | ||
a9fc4408 | 1728 | /* job */ |
4ddc07ca PB |
1729 | bs_dest->in_use = bs_src->in_use; |
1730 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1731 | |
8802d1fd | 1732 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1733 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1734 | bs_src->device_name); | |
1735 | bs_dest->list = bs_src->list; | |
1736 | } | |
8802d1fd | 1737 | |
4ddc07ca PB |
1738 | /* |
1739 | * Swap bs contents for two image chains while they are live, | |
1740 | * while keeping required fields on the BlockDriverState that is | |
1741 | * actually attached to a device. | |
1742 | * | |
1743 | * This will modify the BlockDriverState fields, and swap contents | |
1744 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1745 | * | |
1746 | * bs_new is required to be anonymous. | |
1747 | * | |
1748 | * This function does not create any image files. | |
1749 | */ | |
1750 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1751 | { | |
1752 | BlockDriverState tmp; | |
f6801b83 | 1753 | |
4ddc07ca PB |
1754 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1755 | assert(bs_new->device_name[0] == '\0'); | |
e4654d2d | 1756 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
1757 | assert(bs_new->job == NULL); |
1758 | assert(bs_new->dev == NULL); | |
1759 | assert(bs_new->in_use == 0); | |
1760 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1761 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 1762 | |
4ddc07ca PB |
1763 | tmp = *bs_new; |
1764 | *bs_new = *bs_old; | |
1765 | *bs_old = tmp; | |
a9fc4408 | 1766 | |
4ddc07ca PB |
1767 | /* there are some fields that should not be swapped, move them back */ |
1768 | bdrv_move_feature_fields(&tmp, bs_old); | |
1769 | bdrv_move_feature_fields(bs_old, bs_new); | |
1770 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1771 | |
4ddc07ca PB |
1772 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1773 | assert(bs_new->device_name[0] == '\0'); | |
1774 | ||
1775 | /* Check a few fields that should remain attached to the device */ | |
1776 | assert(bs_new->dev == NULL); | |
1777 | assert(bs_new->job == NULL); | |
1778 | assert(bs_new->in_use == 0); | |
1779 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1780 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 PB |
1781 | |
1782 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1783 | bdrv_rebind(bs_old); |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * Add new bs contents at the top of an image chain while the chain is | |
1788 | * live, while keeping required fields on the top layer. | |
1789 | * | |
1790 | * This will modify the BlockDriverState fields, and swap contents | |
1791 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1792 | * | |
1793 | * bs_new is required to be anonymous. | |
1794 | * | |
1795 | * This function does not create any image files. | |
1796 | */ | |
1797 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1798 | { | |
1799 | bdrv_swap(bs_new, bs_top); | |
1800 | ||
1801 | /* The contents of 'tmp' will become bs_top, as we are | |
1802 | * swapping bs_new and bs_top contents. */ | |
1803 | bs_top->backing_hd = bs_new; | |
1804 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1805 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1806 | bs_new->filename); | |
1807 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1808 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1809 | } |
1810 | ||
4f6fd349 | 1811 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 1812 | { |
fa879d62 | 1813 | assert(!bs->dev); |
3e914655 PB |
1814 | assert(!bs->job); |
1815 | assert(!bs->in_use); | |
4f6fd349 | 1816 | assert(!bs->refcnt); |
e4654d2d | 1817 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 1818 | |
e1b5c52e SH |
1819 | bdrv_close(bs); |
1820 | ||
1b7bdbc1 | 1821 | /* remove from list, if necessary */ |
d22b2f41 | 1822 | bdrv_make_anon(bs); |
34c6f050 | 1823 | |
7267c094 | 1824 | g_free(bs); |
fc01f7e7 FB |
1825 | } |
1826 | ||
fa879d62 MA |
1827 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1828 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1829 | { |
fa879d62 | 1830 | if (bs->dev) { |
18846dee MA |
1831 | return -EBUSY; |
1832 | } | |
fa879d62 | 1833 | bs->dev = dev; |
28a7282a | 1834 | bdrv_iostatus_reset(bs); |
18846dee MA |
1835 | return 0; |
1836 | } | |
1837 | ||
fa879d62 MA |
1838 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1839 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1840 | { |
fa879d62 MA |
1841 | if (bdrv_attach_dev(bs, dev) < 0) { |
1842 | abort(); | |
1843 | } | |
1844 | } | |
1845 | ||
1846 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1847 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1848 | { | |
1849 | assert(bs->dev == dev); | |
1850 | bs->dev = NULL; | |
0e49de52 MA |
1851 | bs->dev_ops = NULL; |
1852 | bs->dev_opaque = NULL; | |
29e05f20 | 1853 | bs->buffer_alignment = 512; |
18846dee MA |
1854 | } |
1855 | ||
fa879d62 MA |
1856 | /* TODO change to return DeviceState * when all users are qdevified */ |
1857 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1858 | { |
fa879d62 | 1859 | return bs->dev; |
18846dee MA |
1860 | } |
1861 | ||
0e49de52 MA |
1862 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1863 | void *opaque) | |
1864 | { | |
1865 | bs->dev_ops = ops; | |
1866 | bs->dev_opaque = opaque; | |
1867 | } | |
1868 | ||
32c81a4a PB |
1869 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1870 | enum MonitorEvent ev, | |
1871 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1872 | { |
1873 | QObject *data; | |
1874 | const char *action_str; | |
1875 | ||
1876 | switch (action) { | |
1877 | case BDRV_ACTION_REPORT: | |
1878 | action_str = "report"; | |
1879 | break; | |
1880 | case BDRV_ACTION_IGNORE: | |
1881 | action_str = "ignore"; | |
1882 | break; | |
1883 | case BDRV_ACTION_STOP: | |
1884 | action_str = "stop"; | |
1885 | break; | |
1886 | default: | |
1887 | abort(); | |
1888 | } | |
1889 | ||
1890 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1891 | bdrv->device_name, | |
1892 | action_str, | |
1893 | is_read ? "read" : "write"); | |
32c81a4a | 1894 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1895 | |
1896 | qobject_decref(data); | |
1897 | } | |
1898 | ||
6f382ed2 LC |
1899 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1900 | { | |
1901 | QObject *data; | |
1902 | ||
1903 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1904 | bdrv_get_device_name(bs), ejected); | |
1905 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1906 | ||
1907 | qobject_decref(data); | |
1908 | } | |
1909 | ||
7d4b4ba5 | 1910 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1911 | { |
145feb17 | 1912 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1913 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1914 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1915 | if (tray_was_closed) { |
1916 | /* tray open */ | |
1917 | bdrv_emit_qmp_eject_event(bs, true); | |
1918 | } | |
1919 | if (load) { | |
1920 | /* tray close */ | |
1921 | bdrv_emit_qmp_eject_event(bs, false); | |
1922 | } | |
145feb17 MA |
1923 | } |
1924 | } | |
1925 | ||
2c6942fa MA |
1926 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1927 | { | |
1928 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1929 | } | |
1930 | ||
025ccaa7 PB |
1931 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1932 | { | |
1933 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1934 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1935 | } | |
1936 | } | |
1937 | ||
e4def80b MA |
1938 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1939 | { | |
1940 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1941 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1942 | } | |
1943 | return false; | |
1944 | } | |
1945 | ||
145feb17 MA |
1946 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1947 | { | |
1948 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1949 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1950 | } |
1951 | } | |
1952 | ||
f107639a MA |
1953 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1954 | { | |
1955 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1956 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1957 | } | |
1958 | return false; | |
1959 | } | |
1960 | ||
e97fc193 AL |
1961 | /* |
1962 | * Run consistency checks on an image | |
1963 | * | |
e076f338 | 1964 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1965 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1966 | * check are stored in res. |
e97fc193 | 1967 | */ |
4534ff54 | 1968 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1969 | { |
1970 | if (bs->drv->bdrv_check == NULL) { | |
1971 | return -ENOTSUP; | |
1972 | } | |
1973 | ||
e076f338 | 1974 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1975 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1976 | } |
1977 | ||
8a426614 KW |
1978 | #define COMMIT_BUF_SECTORS 2048 |
1979 | ||
33e3963e FB |
1980 | /* commit COW file into the raw image */ |
1981 | int bdrv_commit(BlockDriverState *bs) | |
1982 | { | |
19cb3738 | 1983 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1984 | int64_t sector, total_sectors; |
1985 | int n, ro, open_flags; | |
0bce597d | 1986 | int ret = 0; |
8a426614 | 1987 | uint8_t *buf; |
c2cba3d9 | 1988 | char filename[PATH_MAX]; |
33e3963e | 1989 | |
19cb3738 FB |
1990 | if (!drv) |
1991 | return -ENOMEDIUM; | |
4dca4b63 NS |
1992 | |
1993 | if (!bs->backing_hd) { | |
1994 | return -ENOTSUP; | |
33e3963e FB |
1995 | } |
1996 | ||
2d3735d3 SH |
1997 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1998 | return -EBUSY; | |
1999 | } | |
2000 | ||
4dca4b63 | 2001 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2002 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2003 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2004 | open_flags = bs->backing_hd->open_flags; |
2005 | ||
2006 | if (ro) { | |
0bce597d JC |
2007 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2008 | return -EACCES; | |
4dca4b63 | 2009 | } |
ea2384d3 | 2010 | } |
33e3963e | 2011 | |
6ea44308 | 2012 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 2013 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
2014 | |
2015 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2016 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2017 | if (ret < 0) { | |
2018 | goto ro_cleanup; | |
2019 | } | |
2020 | if (ret) { | |
8a426614 KW |
2021 | if (bdrv_read(bs, sector, buf, n) != 0) { |
2022 | ret = -EIO; | |
2023 | goto ro_cleanup; | |
2024 | } | |
2025 | ||
2026 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
2027 | ret = -EIO; | |
2028 | goto ro_cleanup; | |
2029 | } | |
ea2384d3 | 2030 | } |
33e3963e | 2031 | } |
95389c86 | 2032 | |
1d44952f CH |
2033 | if (drv->bdrv_make_empty) { |
2034 | ret = drv->bdrv_make_empty(bs); | |
2035 | bdrv_flush(bs); | |
2036 | } | |
95389c86 | 2037 | |
3f5075ae CH |
2038 | /* |
2039 | * Make sure all data we wrote to the backing device is actually | |
2040 | * stable on disk. | |
2041 | */ | |
2042 | if (bs->backing_hd) | |
2043 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
2044 | |
2045 | ro_cleanup: | |
7267c094 | 2046 | g_free(buf); |
4dca4b63 NS |
2047 | |
2048 | if (ro) { | |
0bce597d JC |
2049 | /* ignoring error return here */ |
2050 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2051 | } |
2052 | ||
1d44952f | 2053 | return ret; |
33e3963e FB |
2054 | } |
2055 | ||
e8877497 | 2056 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2057 | { |
2058 | BlockDriverState *bs; | |
2059 | ||
2060 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
272d2d8e JC |
2061 | if (bs->drv && bs->backing_hd) { |
2062 | int ret = bdrv_commit(bs); | |
2063 | if (ret < 0) { | |
2064 | return ret; | |
2065 | } | |
e8877497 | 2066 | } |
6ab4b5ab | 2067 | } |
e8877497 | 2068 | return 0; |
6ab4b5ab MA |
2069 | } |
2070 | ||
dbffbdcf SH |
2071 | /** |
2072 | * Remove an active request from the tracked requests list | |
2073 | * | |
2074 | * This function should be called when a tracked request is completing. | |
2075 | */ | |
2076 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2077 | { | |
2078 | QLIST_REMOVE(req, list); | |
f4658285 | 2079 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2080 | } |
2081 | ||
2082 | /** | |
2083 | * Add an active request to the tracked requests list | |
2084 | */ | |
2085 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2086 | BlockDriverState *bs, | |
2087 | int64_t sector_num, | |
2088 | int nb_sectors, bool is_write) | |
2089 | { | |
2090 | *req = (BdrvTrackedRequest){ | |
2091 | .bs = bs, | |
2092 | .sector_num = sector_num, | |
2093 | .nb_sectors = nb_sectors, | |
2094 | .is_write = is_write, | |
5f8b6491 | 2095 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
2096 | }; |
2097 | ||
f4658285 SH |
2098 | qemu_co_queue_init(&req->wait_queue); |
2099 | ||
dbffbdcf SH |
2100 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2101 | } | |
2102 | ||
d83947ac SH |
2103 | /** |
2104 | * Round a region to cluster boundaries | |
2105 | */ | |
343bded4 PB |
2106 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2107 | int64_t sector_num, int nb_sectors, | |
2108 | int64_t *cluster_sector_num, | |
2109 | int *cluster_nb_sectors) | |
d83947ac SH |
2110 | { |
2111 | BlockDriverInfo bdi; | |
2112 | ||
2113 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2114 | *cluster_sector_num = sector_num; | |
2115 | *cluster_nb_sectors = nb_sectors; | |
2116 | } else { | |
2117 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2118 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2119 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2120 | nb_sectors, c); | |
2121 | } | |
2122 | } | |
2123 | ||
f4658285 SH |
2124 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
2125 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
2126 | /* aaaa bbbb */ |
2127 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
2128 | return false; | |
2129 | } | |
2130 | /* bbbb aaaa */ | |
2131 | if (req->sector_num >= sector_num + nb_sectors) { | |
2132 | return false; | |
2133 | } | |
2134 | return true; | |
f4658285 SH |
2135 | } |
2136 | ||
2137 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
2138 | int64_t sector_num, int nb_sectors) | |
2139 | { | |
2140 | BdrvTrackedRequest *req; | |
d83947ac SH |
2141 | int64_t cluster_sector_num; |
2142 | int cluster_nb_sectors; | |
f4658285 SH |
2143 | bool retry; |
2144 | ||
d83947ac SH |
2145 | /* If we touch the same cluster it counts as an overlap. This guarantees |
2146 | * that allocating writes will be serialized and not race with each other | |
2147 | * for the same cluster. For example, in copy-on-read it ensures that the | |
2148 | * CoR read and write operations are atomic and guest writes cannot | |
2149 | * interleave between them. | |
2150 | */ | |
343bded4 PB |
2151 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2152 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 2153 | |
f4658285 SH |
2154 | do { |
2155 | retry = false; | |
2156 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
2157 | if (tracked_request_overlaps(req, cluster_sector_num, |
2158 | cluster_nb_sectors)) { | |
5f8b6491 SH |
2159 | /* Hitting this means there was a reentrant request, for |
2160 | * example, a block driver issuing nested requests. This must | |
2161 | * never happen since it means deadlock. | |
2162 | */ | |
2163 | assert(qemu_coroutine_self() != req->co); | |
2164 | ||
f4658285 SH |
2165 | qemu_co_queue_wait(&req->wait_queue); |
2166 | retry = true; | |
2167 | break; | |
2168 | } | |
2169 | } | |
2170 | } while (retry); | |
2171 | } | |
2172 | ||
756e6736 KW |
2173 | /* |
2174 | * Return values: | |
2175 | * 0 - success | |
2176 | * -EINVAL - backing format specified, but no file | |
2177 | * -ENOSPC - can't update the backing file because no space is left in the | |
2178 | * image file header | |
2179 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2180 | */ | |
2181 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2182 | const char *backing_file, const char *backing_fmt) | |
2183 | { | |
2184 | BlockDriver *drv = bs->drv; | |
469ef350 | 2185 | int ret; |
756e6736 | 2186 | |
5f377794 PB |
2187 | /* Backing file format doesn't make sense without a backing file */ |
2188 | if (backing_fmt && !backing_file) { | |
2189 | return -EINVAL; | |
2190 | } | |
2191 | ||
756e6736 | 2192 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2193 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2194 | } else { |
469ef350 | 2195 | ret = -ENOTSUP; |
756e6736 | 2196 | } |
469ef350 PB |
2197 | |
2198 | if (ret == 0) { | |
2199 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2200 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2201 | } | |
2202 | return ret; | |
756e6736 KW |
2203 | } |
2204 | ||
6ebdcee2 JC |
2205 | /* |
2206 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2207 | * | |
2208 | * active is the current topmost image. | |
2209 | * | |
2210 | * Returns NULL if bs is not found in active's image chain, | |
2211 | * or if active == bs. | |
2212 | */ | |
2213 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2214 | BlockDriverState *bs) | |
2215 | { | |
2216 | BlockDriverState *overlay = NULL; | |
2217 | BlockDriverState *intermediate; | |
2218 | ||
2219 | assert(active != NULL); | |
2220 | assert(bs != NULL); | |
2221 | ||
2222 | /* if bs is the same as active, then by definition it has no overlay | |
2223 | */ | |
2224 | if (active == bs) { | |
2225 | return NULL; | |
2226 | } | |
2227 | ||
2228 | intermediate = active; | |
2229 | while (intermediate->backing_hd) { | |
2230 | if (intermediate->backing_hd == bs) { | |
2231 | overlay = intermediate; | |
2232 | break; | |
2233 | } | |
2234 | intermediate = intermediate->backing_hd; | |
2235 | } | |
2236 | ||
2237 | return overlay; | |
2238 | } | |
2239 | ||
2240 | typedef struct BlkIntermediateStates { | |
2241 | BlockDriverState *bs; | |
2242 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2243 | } BlkIntermediateStates; | |
2244 | ||
2245 | ||
2246 | /* | |
2247 | * Drops images above 'base' up to and including 'top', and sets the image | |
2248 | * above 'top' to have base as its backing file. | |
2249 | * | |
2250 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2251 | * information in 'bs' can be properly updated. | |
2252 | * | |
2253 | * E.g., this will convert the following chain: | |
2254 | * bottom <- base <- intermediate <- top <- active | |
2255 | * | |
2256 | * to | |
2257 | * | |
2258 | * bottom <- base <- active | |
2259 | * | |
2260 | * It is allowed for bottom==base, in which case it converts: | |
2261 | * | |
2262 | * base <- intermediate <- top <- active | |
2263 | * | |
2264 | * to | |
2265 | * | |
2266 | * base <- active | |
2267 | * | |
2268 | * Error conditions: | |
2269 | * if active == top, that is considered an error | |
2270 | * | |
2271 | */ | |
2272 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2273 | BlockDriverState *base) | |
2274 | { | |
2275 | BlockDriverState *intermediate; | |
2276 | BlockDriverState *base_bs = NULL; | |
2277 | BlockDriverState *new_top_bs = NULL; | |
2278 | BlkIntermediateStates *intermediate_state, *next; | |
2279 | int ret = -EIO; | |
2280 | ||
2281 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2282 | QSIMPLEQ_INIT(&states_to_delete); | |
2283 | ||
2284 | if (!top->drv || !base->drv) { | |
2285 | goto exit; | |
2286 | } | |
2287 | ||
2288 | new_top_bs = bdrv_find_overlay(active, top); | |
2289 | ||
2290 | if (new_top_bs == NULL) { | |
2291 | /* we could not find the image above 'top', this is an error */ | |
2292 | goto exit; | |
2293 | } | |
2294 | ||
2295 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2296 | * to do, no intermediate images */ | |
2297 | if (new_top_bs->backing_hd == base) { | |
2298 | ret = 0; | |
2299 | goto exit; | |
2300 | } | |
2301 | ||
2302 | intermediate = top; | |
2303 | ||
2304 | /* now we will go down through the list, and add each BDS we find | |
2305 | * into our deletion queue, until we hit the 'base' | |
2306 | */ | |
2307 | while (intermediate) { | |
2308 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2309 | intermediate_state->bs = intermediate; | |
2310 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2311 | ||
2312 | if (intermediate->backing_hd == base) { | |
2313 | base_bs = intermediate->backing_hd; | |
2314 | break; | |
2315 | } | |
2316 | intermediate = intermediate->backing_hd; | |
2317 | } | |
2318 | if (base_bs == NULL) { | |
2319 | /* something went wrong, we did not end at the base. safely | |
2320 | * unravel everything, and exit with error */ | |
2321 | goto exit; | |
2322 | } | |
2323 | ||
2324 | /* success - we can delete the intermediate states, and link top->base */ | |
2325 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2326 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2327 | if (ret) { | |
2328 | goto exit; | |
2329 | } | |
2330 | new_top_bs->backing_hd = base_bs; | |
2331 | ||
2332 | ||
2333 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2334 | /* so that bdrv_close() does not recursively close the chain */ | |
2335 | intermediate_state->bs->backing_hd = NULL; | |
4f6fd349 | 2336 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2337 | } |
2338 | ret = 0; | |
2339 | ||
2340 | exit: | |
2341 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2342 | g_free(intermediate_state); | |
2343 | } | |
2344 | return ret; | |
2345 | } | |
2346 | ||
2347 | ||
71d0770c AL |
2348 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2349 | size_t size) | |
2350 | { | |
2351 | int64_t len; | |
2352 | ||
2353 | if (!bdrv_is_inserted(bs)) | |
2354 | return -ENOMEDIUM; | |
2355 | ||
2356 | if (bs->growable) | |
2357 | return 0; | |
2358 | ||
2359 | len = bdrv_getlength(bs); | |
2360 | ||
fbb7b4e0 KW |
2361 | if (offset < 0) |
2362 | return -EIO; | |
2363 | ||
2364 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2365 | return -EIO; |
2366 | ||
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2371 | int nb_sectors) | |
2372 | { | |
eb5a3165 JS |
2373 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2374 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2375 | } |
2376 | ||
1c9805a3 SH |
2377 | typedef struct RwCo { |
2378 | BlockDriverState *bs; | |
2379 | int64_t sector_num; | |
2380 | int nb_sectors; | |
2381 | QEMUIOVector *qiov; | |
2382 | bool is_write; | |
2383 | int ret; | |
4105eaaa | 2384 | BdrvRequestFlags flags; |
1c9805a3 SH |
2385 | } RwCo; |
2386 | ||
2387 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2388 | { |
1c9805a3 | 2389 | RwCo *rwco = opaque; |
ea2384d3 | 2390 | |
1c9805a3 SH |
2391 | if (!rwco->is_write) { |
2392 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2393 | rwco->nb_sectors, rwco->qiov, |
2394 | rwco->flags); | |
1c9805a3 SH |
2395 | } else { |
2396 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2397 | rwco->nb_sectors, rwco->qiov, |
2398 | rwco->flags); | |
1c9805a3 SH |
2399 | } |
2400 | } | |
e7a8a783 | 2401 | |
1c9805a3 | 2402 | /* |
8d3b1a2d | 2403 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2404 | */ |
8d3b1a2d | 2405 | static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num, |
4105eaaa PL |
2406 | QEMUIOVector *qiov, bool is_write, |
2407 | BdrvRequestFlags flags) | |
1c9805a3 | 2408 | { |
1c9805a3 SH |
2409 | Coroutine *co; |
2410 | RwCo rwco = { | |
2411 | .bs = bs, | |
2412 | .sector_num = sector_num, | |
8d3b1a2d KW |
2413 | .nb_sectors = qiov->size >> BDRV_SECTOR_BITS, |
2414 | .qiov = qiov, | |
1c9805a3 SH |
2415 | .is_write = is_write, |
2416 | .ret = NOT_DONE, | |
4105eaaa | 2417 | .flags = flags, |
1c9805a3 | 2418 | }; |
8d3b1a2d | 2419 | assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0); |
e7a8a783 | 2420 | |
498e386c ZYW |
2421 | /** |
2422 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2423 | * will not fire; so the I/O throttling function has to be disabled here | |
2424 | * if it has been enabled. | |
2425 | */ | |
2426 | if (bs->io_limits_enabled) { | |
2427 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2428 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2429 | bdrv_io_limits_disable(bs); | |
2430 | } | |
2431 | ||
1c9805a3 SH |
2432 | if (qemu_in_coroutine()) { |
2433 | /* Fast-path if already in coroutine context */ | |
2434 | bdrv_rw_co_entry(&rwco); | |
2435 | } else { | |
2436 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2437 | qemu_coroutine_enter(co, &rwco); | |
2438 | while (rwco.ret == NOT_DONE) { | |
2439 | qemu_aio_wait(); | |
2440 | } | |
2441 | } | |
2442 | return rwco.ret; | |
2443 | } | |
b338082b | 2444 | |
8d3b1a2d KW |
2445 | /* |
2446 | * Process a synchronous request using coroutines | |
2447 | */ | |
2448 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2449 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2450 | { |
2451 | QEMUIOVector qiov; | |
2452 | struct iovec iov = { | |
2453 | .iov_base = (void *)buf, | |
2454 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2455 | }; | |
2456 | ||
2457 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4105eaaa | 2458 | return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags); |
8d3b1a2d KW |
2459 | } |
2460 | ||
1c9805a3 SH |
2461 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2462 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2463 | uint8_t *buf, int nb_sectors) | |
2464 | { | |
4105eaaa | 2465 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2466 | } |
2467 | ||
07d27a44 MA |
2468 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2469 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2470 | uint8_t *buf, int nb_sectors) | |
2471 | { | |
2472 | bool enabled; | |
2473 | int ret; | |
2474 | ||
2475 | enabled = bs->io_limits_enabled; | |
2476 | bs->io_limits_enabled = false; | |
4e7395e8 | 2477 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2478 | bs->io_limits_enabled = enabled; |
2479 | return ret; | |
2480 | } | |
2481 | ||
5fafdf24 | 2482 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2483 | -EIO generic I/O error (may happen for all errors) |
2484 | -ENOMEDIUM No media inserted. | |
2485 | -EINVAL Invalid sector number or nb_sectors | |
2486 | -EACCES Trying to write a read-only device | |
2487 | */ | |
5fafdf24 | 2488 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2489 | const uint8_t *buf, int nb_sectors) |
2490 | { | |
4105eaaa | 2491 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2492 | } |
2493 | ||
8d3b1a2d KW |
2494 | int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov) |
2495 | { | |
4105eaaa PL |
2496 | return bdrv_rwv_co(bs, sector_num, qiov, true, 0); |
2497 | } | |
2498 | ||
aa7bfbff PL |
2499 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2500 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2501 | { |
2502 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2503 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2504 | } |
2505 | ||
d75cbb5e PL |
2506 | /* |
2507 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2508 | * The operation is sped up by checking the block status and only writing | |
2509 | * zeroes to the device if they currently do not return zeroes. Optional | |
2510 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2511 | * | |
2512 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2513 | */ | |
2514 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2515 | { | |
2516 | int64_t target_size = bdrv_getlength(bs) / BDRV_SECTOR_SIZE; | |
2517 | int64_t ret, nb_sectors, sector_num = 0; | |
2518 | int n; | |
2519 | ||
2520 | for (;;) { | |
2521 | nb_sectors = target_size - sector_num; | |
2522 | if (nb_sectors <= 0) { | |
2523 | return 0; | |
2524 | } | |
2525 | if (nb_sectors > INT_MAX) { | |
2526 | nb_sectors = INT_MAX; | |
2527 | } | |
2528 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2529 | if (ret < 0) { |
2530 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2531 | sector_num, strerror(-ret)); | |
2532 | return ret; | |
2533 | } | |
d75cbb5e PL |
2534 | if (ret & BDRV_BLOCK_ZERO) { |
2535 | sector_num += n; | |
2536 | continue; | |
2537 | } | |
2538 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2539 | if (ret < 0) { | |
2540 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2541 | sector_num, strerror(-ret)); | |
2542 | return ret; | |
2543 | } | |
2544 | sector_num += n; | |
2545 | } | |
2546 | } | |
2547 | ||
eda578e5 AL |
2548 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2549 | void *buf, int count1) | |
83f64091 | 2550 | { |
6ea44308 | 2551 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2552 | int len, nb_sectors, count; |
2553 | int64_t sector_num; | |
9a8c4cce | 2554 | int ret; |
83f64091 FB |
2555 | |
2556 | count = count1; | |
2557 | /* first read to align to sector start */ | |
6ea44308 | 2558 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2559 | if (len > count) |
2560 | len = count; | |
6ea44308 | 2561 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2562 | if (len > 0) { |
9a8c4cce KW |
2563 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2564 | return ret; | |
6ea44308 | 2565 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2566 | count -= len; |
2567 | if (count == 0) | |
2568 | return count1; | |
2569 | sector_num++; | |
2570 | buf += len; | |
2571 | } | |
2572 | ||
2573 | /* read the sectors "in place" */ | |
6ea44308 | 2574 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2575 | if (nb_sectors > 0) { |
9a8c4cce KW |
2576 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2577 | return ret; | |
83f64091 | 2578 | sector_num += nb_sectors; |
6ea44308 | 2579 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2580 | buf += len; |
2581 | count -= len; | |
2582 | } | |
2583 | ||
2584 | /* add data from the last sector */ | |
2585 | if (count > 0) { | |
9a8c4cce KW |
2586 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2587 | return ret; | |
83f64091 FB |
2588 | memcpy(buf, tmp_buf, count); |
2589 | } | |
2590 | return count1; | |
2591 | } | |
2592 | ||
8d3b1a2d | 2593 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2594 | { |
6ea44308 | 2595 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2596 | int len, nb_sectors, count; |
2597 | int64_t sector_num; | |
9a8c4cce | 2598 | int ret; |
83f64091 | 2599 | |
8d3b1a2d KW |
2600 | count = qiov->size; |
2601 | ||
83f64091 | 2602 | /* first write to align to sector start */ |
6ea44308 | 2603 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2604 | if (len > count) |
2605 | len = count; | |
6ea44308 | 2606 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2607 | if (len > 0) { |
9a8c4cce KW |
2608 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2609 | return ret; | |
8d3b1a2d KW |
2610 | qemu_iovec_to_buf(qiov, 0, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), |
2611 | len); | |
9a8c4cce KW |
2612 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2613 | return ret; | |
83f64091 FB |
2614 | count -= len; |
2615 | if (count == 0) | |
8d3b1a2d | 2616 | return qiov->size; |
83f64091 | 2617 | sector_num++; |
83f64091 FB |
2618 | } |
2619 | ||
2620 | /* write the sectors "in place" */ | |
6ea44308 | 2621 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2622 | if (nb_sectors > 0) { |
8d3b1a2d KW |
2623 | QEMUIOVector qiov_inplace; |
2624 | ||
2625 | qemu_iovec_init(&qiov_inplace, qiov->niov); | |
2626 | qemu_iovec_concat(&qiov_inplace, qiov, len, | |
2627 | nb_sectors << BDRV_SECTOR_BITS); | |
2628 | ret = bdrv_writev(bs, sector_num, &qiov_inplace); | |
2629 | qemu_iovec_destroy(&qiov_inplace); | |
2630 | if (ret < 0) { | |
9a8c4cce | 2631 | return ret; |
8d3b1a2d KW |
2632 | } |
2633 | ||
83f64091 | 2634 | sector_num += nb_sectors; |
6ea44308 | 2635 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2636 | count -= len; |
2637 | } | |
2638 | ||
2639 | /* add data from the last sector */ | |
2640 | if (count > 0) { | |
9a8c4cce KW |
2641 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2642 | return ret; | |
8d3b1a2d | 2643 | qemu_iovec_to_buf(qiov, qiov->size - count, tmp_buf, count); |
9a8c4cce KW |
2644 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2645 | return ret; | |
83f64091 | 2646 | } |
8d3b1a2d KW |
2647 | return qiov->size; |
2648 | } | |
2649 | ||
2650 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
2651 | const void *buf, int count1) | |
2652 | { | |
2653 | QEMUIOVector qiov; | |
2654 | struct iovec iov = { | |
2655 | .iov_base = (void *) buf, | |
2656 | .iov_len = count1, | |
2657 | }; | |
2658 | ||
2659 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2660 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2661 | } |
83f64091 | 2662 | |
f08145fe KW |
2663 | /* |
2664 | * Writes to the file and ensures that no writes are reordered across this | |
2665 | * request (acts as a barrier) | |
2666 | * | |
2667 | * Returns 0 on success, -errno in error cases. | |
2668 | */ | |
2669 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2670 | const void *buf, int count) | |
2671 | { | |
2672 | int ret; | |
2673 | ||
2674 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2675 | if (ret < 0) { | |
2676 | return ret; | |
2677 | } | |
2678 | ||
f05fa4ad PB |
2679 | /* No flush needed for cache modes that already do it */ |
2680 | if (bs->enable_write_cache) { | |
f08145fe KW |
2681 | bdrv_flush(bs); |
2682 | } | |
2683 | ||
2684 | return 0; | |
2685 | } | |
2686 | ||
470c0504 | 2687 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2688 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2689 | { | |
2690 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2691 | * their read buffer while the operation is in progress do not end up | |
2692 | * modifying the image file. This is critical for zero-copy guest I/O | |
2693 | * where anything might happen inside guest memory. | |
2694 | */ | |
2695 | void *bounce_buffer; | |
2696 | ||
79c053bd | 2697 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2698 | struct iovec iov; |
2699 | QEMUIOVector bounce_qiov; | |
2700 | int64_t cluster_sector_num; | |
2701 | int cluster_nb_sectors; | |
2702 | size_t skip_bytes; | |
2703 | int ret; | |
2704 | ||
2705 | /* Cover entire cluster so no additional backing file I/O is required when | |
2706 | * allocating cluster in the image file. | |
2707 | */ | |
343bded4 PB |
2708 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2709 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2710 | |
470c0504 SH |
2711 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2712 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2713 | |
2714 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2715 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2716 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2717 | ||
79c053bd SH |
2718 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2719 | &bounce_qiov); | |
ab185921 SH |
2720 | if (ret < 0) { |
2721 | goto err; | |
2722 | } | |
2723 | ||
79c053bd SH |
2724 | if (drv->bdrv_co_write_zeroes && |
2725 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 2726 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 2727 | cluster_nb_sectors, 0); |
79c053bd | 2728 | } else { |
f05fa4ad PB |
2729 | /* This does not change the data on the disk, it is not necessary |
2730 | * to flush even in cache=writethrough mode. | |
2731 | */ | |
79c053bd | 2732 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2733 | &bounce_qiov); |
79c053bd SH |
2734 | } |
2735 | ||
ab185921 SH |
2736 | if (ret < 0) { |
2737 | /* It might be okay to ignore write errors for guest requests. If this | |
2738 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2739 | * Simply report it in all cases. | |
2740 | */ | |
2741 | goto err; | |
2742 | } | |
2743 | ||
2744 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2745 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2746 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2747 | |
2748 | err: | |
2749 | qemu_vfree(bounce_buffer); | |
2750 | return ret; | |
2751 | } | |
2752 | ||
c5fbe571 SH |
2753 | /* |
2754 | * Handle a read request in coroutine context | |
2755 | */ | |
2756 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2757 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2758 | BdrvRequestFlags flags) | |
da1fa91d KW |
2759 | { |
2760 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2761 | BdrvTrackedRequest req; |
2762 | int ret; | |
da1fa91d | 2763 | |
da1fa91d KW |
2764 | if (!drv) { |
2765 | return -ENOMEDIUM; | |
2766 | } | |
2767 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2768 | return -EIO; | |
2769 | } | |
2770 | ||
f4658285 | 2771 | if (bs->copy_on_read) { |
470c0504 SH |
2772 | flags |= BDRV_REQ_COPY_ON_READ; |
2773 | } | |
2774 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2775 | bs->copy_on_read_in_flight++; | |
2776 | } | |
2777 | ||
2778 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2779 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2780 | } | |
2781 | ||
cc0681c4 BC |
2782 | /* throttling disk I/O */ |
2783 | if (bs->io_limits_enabled) { | |
2784 | bdrv_io_limits_intercept(bs, nb_sectors, false); | |
2785 | } | |
2786 | ||
dbffbdcf | 2787 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2788 | |
470c0504 | 2789 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2790 | int pnum; |
2791 | ||
bdad13b9 | 2792 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
2793 | if (ret < 0) { |
2794 | goto out; | |
2795 | } | |
2796 | ||
2797 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2798 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2799 | goto out; |
2800 | } | |
2801 | } | |
2802 | ||
893a8f62 MK |
2803 | if (!(bs->zero_beyond_eof && bs->growable)) { |
2804 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
2805 | } else { | |
2806 | /* Read zeros after EOF of growable BDSes */ | |
2807 | int64_t len, total_sectors, max_nb_sectors; | |
2808 | ||
2809 | len = bdrv_getlength(bs); | |
2810 | if (len < 0) { | |
2811 | ret = len; | |
2812 | goto out; | |
2813 | } | |
2814 | ||
d055a1fe | 2815 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
893a8f62 MK |
2816 | max_nb_sectors = MAX(0, total_sectors - sector_num); |
2817 | if (max_nb_sectors > 0) { | |
2818 | ret = drv->bdrv_co_readv(bs, sector_num, | |
2819 | MIN(nb_sectors, max_nb_sectors), qiov); | |
2820 | } else { | |
2821 | ret = 0; | |
2822 | } | |
2823 | ||
2824 | /* Reading beyond end of file is supposed to produce zeroes */ | |
2825 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
2826 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
2827 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
2828 | BDRV_SECTOR_SIZE; | |
2829 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
2830 | } | |
2831 | } | |
ab185921 SH |
2832 | |
2833 | out: | |
dbffbdcf | 2834 | tracked_request_end(&req); |
470c0504 SH |
2835 | |
2836 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2837 | bs->copy_on_read_in_flight--; | |
2838 | } | |
2839 | ||
dbffbdcf | 2840 | return ret; |
da1fa91d KW |
2841 | } |
2842 | ||
c5fbe571 | 2843 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2844 | int nb_sectors, QEMUIOVector *qiov) |
2845 | { | |
c5fbe571 | 2846 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2847 | |
470c0504 SH |
2848 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2849 | } | |
2850 | ||
2851 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2852 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2853 | { | |
2854 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2855 | ||
2856 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2857 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2858 | } |
2859 | ||
c31cb707 PL |
2860 | /* if no limit is specified in the BlockLimits use a default |
2861 | * of 32768 512-byte sectors (16 MiB) per request. | |
2862 | */ | |
2863 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
2864 | ||
f08f2dda | 2865 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 2866 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
2867 | { |
2868 | BlockDriver *drv = bs->drv; | |
2869 | QEMUIOVector qiov; | |
c31cb707 PL |
2870 | struct iovec iov = {0}; |
2871 | int ret = 0; | |
f08f2dda | 2872 | |
c31cb707 PL |
2873 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
2874 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 2875 | |
c31cb707 PL |
2876 | while (nb_sectors > 0 && !ret) { |
2877 | int num = nb_sectors; | |
2878 | ||
b8d71c09 PB |
2879 | /* Align request. Block drivers can expect the "bulk" of the request |
2880 | * to be aligned. | |
2881 | */ | |
2882 | if (bs->bl.write_zeroes_alignment | |
2883 | && num > bs->bl.write_zeroes_alignment) { | |
2884 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
2885 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 2886 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
2887 | num -= sector_num % bs->bl.write_zeroes_alignment; |
2888 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
2889 | /* Shorten the request to the last aligned sector. num cannot | |
2890 | * underflow because num > bs->bl.write_zeroes_alignment. | |
2891 | */ | |
2892 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 2893 | } |
621f0589 | 2894 | } |
f08f2dda | 2895 | |
c31cb707 PL |
2896 | /* limit request size */ |
2897 | if (num > max_write_zeroes) { | |
2898 | num = max_write_zeroes; | |
2899 | } | |
2900 | ||
2901 | ret = -ENOTSUP; | |
2902 | /* First try the efficient write zeroes operation */ | |
2903 | if (drv->bdrv_co_write_zeroes) { | |
2904 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
2905 | } | |
2906 | ||
2907 | if (ret == -ENOTSUP) { | |
2908 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2909 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
2910 | if (iov.iov_base == NULL) { | |
b8d71c09 PB |
2911 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
2912 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); | |
c31cb707 PL |
2913 | } |
2914 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 2915 | |
c31cb707 | 2916 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
2917 | |
2918 | /* Keep bounce buffer around if it is big enough for all | |
2919 | * all future requests. | |
2920 | */ | |
2921 | if (num < max_write_zeroes) { | |
2922 | qemu_vfree(iov.iov_base); | |
2923 | iov.iov_base = NULL; | |
2924 | } | |
c31cb707 PL |
2925 | } |
2926 | ||
2927 | sector_num += num; | |
2928 | nb_sectors -= num; | |
2929 | } | |
f08f2dda SH |
2930 | |
2931 | qemu_vfree(iov.iov_base); | |
2932 | return ret; | |
2933 | } | |
2934 | ||
c5fbe571 SH |
2935 | /* |
2936 | * Handle a write request in coroutine context | |
2937 | */ | |
2938 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2939 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2940 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2941 | { |
2942 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2943 | BdrvTrackedRequest req; |
6b7cb247 | 2944 | int ret; |
da1fa91d KW |
2945 | |
2946 | if (!bs->drv) { | |
2947 | return -ENOMEDIUM; | |
2948 | } | |
2949 | if (bs->read_only) { | |
2950 | return -EACCES; | |
2951 | } | |
2952 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2953 | return -EIO; | |
2954 | } | |
2955 | ||
470c0504 | 2956 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2957 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2958 | } | |
2959 | ||
cc0681c4 BC |
2960 | /* throttling disk I/O */ |
2961 | if (bs->io_limits_enabled) { | |
2962 | bdrv_io_limits_intercept(bs, nb_sectors, true); | |
2963 | } | |
2964 | ||
dbffbdcf SH |
2965 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2966 | ||
d616b224 SH |
2967 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req); |
2968 | ||
2969 | if (ret < 0) { | |
2970 | /* Do nothing, write notifier decided to fail this request */ | |
2971 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
aa7bfbff | 2972 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda SH |
2973 | } else { |
2974 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2975 | } | |
6b7cb247 | 2976 | |
f05fa4ad PB |
2977 | if (ret == 0 && !bs->enable_write_cache) { |
2978 | ret = bdrv_co_flush(bs); | |
2979 | } | |
2980 | ||
e4654d2d | 2981 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2982 | |
2983 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2984 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2985 | } | |
df2a6f29 PB |
2986 | if (bs->growable && ret >= 0) { |
2987 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
2988 | } | |
da1fa91d | 2989 | |
dbffbdcf SH |
2990 | tracked_request_end(&req); |
2991 | ||
6b7cb247 | 2992 | return ret; |
da1fa91d KW |
2993 | } |
2994 | ||
c5fbe571 SH |
2995 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2996 | int nb_sectors, QEMUIOVector *qiov) | |
2997 | { | |
2998 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2999 | ||
f08f2dda SH |
3000 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3001 | } | |
3002 | ||
3003 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3004 | int64_t sector_num, int nb_sectors, |
3005 | BdrvRequestFlags flags) | |
f08f2dda | 3006 | { |
94d6ff21 | 3007 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3008 | |
d32f35cb PL |
3009 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3010 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3011 | } | |
3012 | ||
f08f2dda | 3013 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3014 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3015 | } |
3016 | ||
83f64091 FB |
3017 | /** |
3018 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3019 | */ | |
3020 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3021 | { | |
3022 | BlockDriver *drv = bs->drv; | |
51762288 | 3023 | int ret; |
83f64091 | 3024 | if (!drv) |
19cb3738 | 3025 | return -ENOMEDIUM; |
83f64091 FB |
3026 | if (!drv->bdrv_truncate) |
3027 | return -ENOTSUP; | |
59f2689d NS |
3028 | if (bs->read_only) |
3029 | return -EACCES; | |
8591675f MT |
3030 | if (bdrv_in_use(bs)) |
3031 | return -EBUSY; | |
51762288 SH |
3032 | ret = drv->bdrv_truncate(bs, offset); |
3033 | if (ret == 0) { | |
3034 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3035 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3036 | } |
3037 | return ret; | |
83f64091 FB |
3038 | } |
3039 | ||
4a1d5e1f FZ |
3040 | /** |
3041 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3042 | * allocated space. Return < 0 if error or unknown. | |
3043 | */ | |
3044 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3045 | { | |
3046 | BlockDriver *drv = bs->drv; | |
3047 | if (!drv) { | |
3048 | return -ENOMEDIUM; | |
3049 | } | |
3050 | if (drv->bdrv_get_allocated_file_size) { | |
3051 | return drv->bdrv_get_allocated_file_size(bs); | |
3052 | } | |
3053 | if (bs->file) { | |
3054 | return bdrv_get_allocated_file_size(bs->file); | |
3055 | } | |
3056 | return -ENOTSUP; | |
3057 | } | |
3058 | ||
83f64091 FB |
3059 | /** |
3060 | * Length of a file in bytes. Return < 0 if error or unknown. | |
3061 | */ | |
3062 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3063 | { | |
3064 | BlockDriver *drv = bs->drv; | |
3065 | if (!drv) | |
19cb3738 | 3066 | return -ENOMEDIUM; |
51762288 | 3067 | |
b94a2610 KW |
3068 | if (drv->has_variable_length) { |
3069 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3070 | if (ret < 0) { | |
3071 | return ret; | |
46a4e4e6 | 3072 | } |
83f64091 | 3073 | } |
46a4e4e6 | 3074 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3075 | } |
3076 | ||
19cb3738 | 3077 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3078 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3079 | { |
19cb3738 FB |
3080 | int64_t length; |
3081 | length = bdrv_getlength(bs); | |
3082 | if (length < 0) | |
3083 | length = 0; | |
3084 | else | |
6ea44308 | 3085 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 3086 | *nb_sectors_ptr = length; |
fc01f7e7 | 3087 | } |
cf98951b | 3088 | |
ff06f5f3 PB |
3089 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3090 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3091 | { |
3092 | bs->on_read_error = on_read_error; | |
3093 | bs->on_write_error = on_write_error; | |
3094 | } | |
3095 | ||
1ceee0d5 | 3096 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3097 | { |
3098 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3099 | } | |
3100 | ||
3e1caa5f PB |
3101 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3102 | { | |
3103 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3104 | ||
3105 | switch (on_err) { | |
3106 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
3107 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
3108 | case BLOCKDEV_ON_ERROR_STOP: | |
3109 | return BDRV_ACTION_STOP; | |
3110 | case BLOCKDEV_ON_ERROR_REPORT: | |
3111 | return BDRV_ACTION_REPORT; | |
3112 | case BLOCKDEV_ON_ERROR_IGNORE: | |
3113 | return BDRV_ACTION_IGNORE; | |
3114 | default: | |
3115 | abort(); | |
3116 | } | |
3117 | } | |
3118 | ||
3119 | /* This is done by device models because, while the block layer knows | |
3120 | * about the error, it does not know whether an operation comes from | |
3121 | * the device or the block layer (from a job, for example). | |
3122 | */ | |
3123 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3124 | bool is_read, int error) | |
3125 | { | |
3126 | assert(error >= 0); | |
32c81a4a | 3127 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
3128 | if (action == BDRV_ACTION_STOP) { |
3129 | vm_stop(RUN_STATE_IO_ERROR); | |
3130 | bdrv_iostatus_set_err(bs, error); | |
3131 | } | |
3132 | } | |
3133 | ||
b338082b FB |
3134 | int bdrv_is_read_only(BlockDriverState *bs) |
3135 | { | |
3136 | return bs->read_only; | |
3137 | } | |
3138 | ||
985a03b0 TS |
3139 | int bdrv_is_sg(BlockDriverState *bs) |
3140 | { | |
3141 | return bs->sg; | |
3142 | } | |
3143 | ||
e900a7b7 CH |
3144 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3145 | { | |
3146 | return bs->enable_write_cache; | |
3147 | } | |
3148 | ||
425b0148 PB |
3149 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3150 | { | |
3151 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3152 | |
3153 | /* so a reopen() will preserve wce */ | |
3154 | if (wce) { | |
3155 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3156 | } else { | |
3157 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3158 | } | |
425b0148 PB |
3159 | } |
3160 | ||
ea2384d3 FB |
3161 | int bdrv_is_encrypted(BlockDriverState *bs) |
3162 | { | |
3163 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3164 | return 1; | |
3165 | return bs->encrypted; | |
3166 | } | |
3167 | ||
c0f4ce77 AL |
3168 | int bdrv_key_required(BlockDriverState *bs) |
3169 | { | |
3170 | BlockDriverState *backing_hd = bs->backing_hd; | |
3171 | ||
3172 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3173 | return 1; | |
3174 | return (bs->encrypted && !bs->valid_key); | |
3175 | } | |
3176 | ||
ea2384d3 FB |
3177 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3178 | { | |
3179 | int ret; | |
3180 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3181 | ret = bdrv_set_key(bs->backing_hd, key); | |
3182 | if (ret < 0) | |
3183 | return ret; | |
3184 | if (!bs->encrypted) | |
3185 | return 0; | |
3186 | } | |
fd04a2ae SH |
3187 | if (!bs->encrypted) { |
3188 | return -EINVAL; | |
3189 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3190 | return -ENOMEDIUM; | |
3191 | } | |
c0f4ce77 | 3192 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3193 | if (ret < 0) { |
3194 | bs->valid_key = 0; | |
3195 | } else if (!bs->valid_key) { | |
3196 | bs->valid_key = 1; | |
3197 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3198 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3199 | } |
c0f4ce77 | 3200 | return ret; |
ea2384d3 FB |
3201 | } |
3202 | ||
f8d6bba1 | 3203 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3204 | { |
f8d6bba1 | 3205 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3206 | } |
3207 | ||
5fafdf24 | 3208 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3209 | void *opaque) |
3210 | { | |
3211 | BlockDriver *drv; | |
3212 | ||
8a22f02a | 3213 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
3214 | it(opaque, drv->format_name); |
3215 | } | |
3216 | } | |
3217 | ||
b338082b FB |
3218 | BlockDriverState *bdrv_find(const char *name) |
3219 | { | |
3220 | BlockDriverState *bs; | |
3221 | ||
1b7bdbc1 SH |
3222 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
3223 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 3224 | return bs; |
1b7bdbc1 | 3225 | } |
b338082b FB |
3226 | } |
3227 | return NULL; | |
3228 | } | |
3229 | ||
2f399b0a MA |
3230 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3231 | { | |
3232 | if (!bs) { | |
3233 | return QTAILQ_FIRST(&bdrv_states); | |
3234 | } | |
3235 | return QTAILQ_NEXT(bs, list); | |
3236 | } | |
3237 | ||
51de9760 | 3238 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3239 | { |
3240 | BlockDriverState *bs; | |
3241 | ||
1b7bdbc1 | 3242 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 3243 | it(opaque, bs); |
81d0912d FB |
3244 | } |
3245 | } | |
3246 | ||
ea2384d3 FB |
3247 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3248 | { | |
3249 | return bs->device_name; | |
3250 | } | |
3251 | ||
c8433287 MA |
3252 | int bdrv_get_flags(BlockDriverState *bs) |
3253 | { | |
3254 | return bs->open_flags; | |
3255 | } | |
3256 | ||
f0f0fdfe | 3257 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3258 | { |
3259 | BlockDriverState *bs; | |
f0f0fdfe | 3260 | int result = 0; |
c6ca28d6 | 3261 | |
1b7bdbc1 | 3262 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f0f0fdfe KW |
3263 | int ret = bdrv_flush(bs); |
3264 | if (ret < 0 && !result) { | |
3265 | result = ret; | |
3266 | } | |
1b7bdbc1 | 3267 | } |
f0f0fdfe KW |
3268 | |
3269 | return result; | |
c6ca28d6 AL |
3270 | } |
3271 | ||
3ac21627 PL |
3272 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3273 | { | |
3274 | return 1; | |
3275 | } | |
3276 | ||
f2feebbd KW |
3277 | int bdrv_has_zero_init(BlockDriverState *bs) |
3278 | { | |
3279 | assert(bs->drv); | |
3280 | ||
11212d8f PB |
3281 | /* If BS is a copy on write image, it is initialized to |
3282 | the contents of the base image, which may not be zeroes. */ | |
3283 | if (bs->backing_hd) { | |
3284 | return 0; | |
3285 | } | |
336c1c12 KW |
3286 | if (bs->drv->bdrv_has_zero_init) { |
3287 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3288 | } |
3289 | ||
3ac21627 PL |
3290 | /* safe default */ |
3291 | return 0; | |
f2feebbd KW |
3292 | } |
3293 | ||
4ce78691 PL |
3294 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3295 | { | |
3296 | BlockDriverInfo bdi; | |
3297 | ||
3298 | if (bs->backing_hd) { | |
3299 | return false; | |
3300 | } | |
3301 | ||
3302 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3303 | return bdi.unallocated_blocks_are_zero; | |
3304 | } | |
3305 | ||
3306 | return false; | |
3307 | } | |
3308 | ||
3309 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3310 | { | |
3311 | BlockDriverInfo bdi; | |
3312 | ||
3313 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3314 | return false; | |
3315 | } | |
3316 | ||
3317 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3318 | return bdi.can_write_zeroes_with_unmap; | |
3319 | } | |
3320 | ||
3321 | return false; | |
3322 | } | |
3323 | ||
b6b8a333 | 3324 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3325 | BlockDriverState *bs; |
b35b2bba | 3326 | BlockDriverState *base; |
376ae3f1 SH |
3327 | int64_t sector_num; |
3328 | int nb_sectors; | |
3329 | int *pnum; | |
b6b8a333 | 3330 | int64_t ret; |
376ae3f1 | 3331 | bool done; |
b6b8a333 | 3332 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3333 | |
f58c7b35 TS |
3334 | /* |
3335 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3336 | * not implementing the functionality are assumed to not support backing files, | |
3337 | * hence all their sectors are reported as allocated. | |
3338 | * | |
bd9533e3 SH |
3339 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3340 | * and 'pnum' is set to 0. | |
3341 | * | |
f58c7b35 TS |
3342 | * 'pnum' is set to the number of sectors (including and immediately following |
3343 | * the specified sector) that are known to be in the same | |
3344 | * allocated/unallocated state. | |
3345 | * | |
bd9533e3 SH |
3346 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3347 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3348 | */ |
b6b8a333 PB |
3349 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3350 | int64_t sector_num, | |
3351 | int nb_sectors, int *pnum) | |
f58c7b35 | 3352 | { |
617ccb46 | 3353 | int64_t length; |
bd9533e3 | 3354 | int64_t n; |
5daa74a6 | 3355 | int64_t ret, ret2; |
bd9533e3 | 3356 | |
617ccb46 PB |
3357 | length = bdrv_getlength(bs); |
3358 | if (length < 0) { | |
3359 | return length; | |
3360 | } | |
3361 | ||
3362 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3363 | *pnum = 0; |
3364 | return 0; | |
3365 | } | |
3366 | ||
3367 | n = bs->total_sectors - sector_num; | |
3368 | if (n < nb_sectors) { | |
3369 | nb_sectors = n; | |
3370 | } | |
3371 | ||
b6b8a333 | 3372 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3373 | *pnum = nb_sectors; |
918e92d7 PB |
3374 | ret = BDRV_BLOCK_DATA; |
3375 | if (bs->drv->protocol_name) { | |
3376 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3377 | } | |
3378 | return ret; | |
f58c7b35 | 3379 | } |
6aebab14 | 3380 | |
415b5b01 PB |
3381 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3382 | if (ret < 0) { | |
3e0a233d | 3383 | *pnum = 0; |
415b5b01 PB |
3384 | return ret; |
3385 | } | |
3386 | ||
92bc50a5 PL |
3387 | if (ret & BDRV_BLOCK_RAW) { |
3388 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
3389 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3390 | *pnum, pnum); | |
3391 | } | |
3392 | ||
c3d86884 PL |
3393 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
3394 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 3395 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 3396 | } else if (bs->backing_hd) { |
f0ad5712 PB |
3397 | BlockDriverState *bs2 = bs->backing_hd; |
3398 | int64_t length2 = bdrv_getlength(bs2); | |
3399 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3400 | ret |= BDRV_BLOCK_ZERO; | |
3401 | } | |
3402 | } | |
415b5b01 | 3403 | } |
5daa74a6 PB |
3404 | |
3405 | if (bs->file && | |
3406 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3407 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3408 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3409 | *pnum, pnum); | |
3410 | if (ret2 >= 0) { | |
3411 | /* Ignore errors. This is just providing extra information, it | |
3412 | * is useful but not necessary. | |
3413 | */ | |
3414 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3415 | } | |
3416 | } | |
3417 | ||
415b5b01 | 3418 | return ret; |
060f51c9 SH |
3419 | } |
3420 | ||
b6b8a333 PB |
3421 | /* Coroutine wrapper for bdrv_get_block_status() */ |
3422 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 3423 | { |
b6b8a333 | 3424 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
3425 | BlockDriverState *bs = data->bs; |
3426 | ||
b6b8a333 PB |
3427 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
3428 | data->pnum); | |
060f51c9 SH |
3429 | data->done = true; |
3430 | } | |
3431 | ||
3432 | /* | |
b6b8a333 | 3433 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 3434 | * |
b6b8a333 | 3435 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 3436 | */ |
b6b8a333 PB |
3437 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
3438 | int nb_sectors, int *pnum) | |
060f51c9 | 3439 | { |
6aebab14 | 3440 | Coroutine *co; |
b6b8a333 | 3441 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
3442 | .bs = bs, |
3443 | .sector_num = sector_num, | |
3444 | .nb_sectors = nb_sectors, | |
3445 | .pnum = pnum, | |
3446 | .done = false, | |
3447 | }; | |
3448 | ||
bdad13b9 PB |
3449 | if (qemu_in_coroutine()) { |
3450 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 3451 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 3452 | } else { |
b6b8a333 | 3453 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
3454 | qemu_coroutine_enter(co, &data); |
3455 | while (!data.done) { | |
3456 | qemu_aio_wait(); | |
3457 | } | |
6aebab14 SH |
3458 | } |
3459 | return data.ret; | |
f58c7b35 TS |
3460 | } |
3461 | ||
b6b8a333 PB |
3462 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
3463 | int nb_sectors, int *pnum) | |
3464 | { | |
4333bb71 PB |
3465 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
3466 | if (ret < 0) { | |
3467 | return ret; | |
3468 | } | |
3469 | return | |
3470 | (ret & BDRV_BLOCK_DATA) || | |
3471 | ((ret & BDRV_BLOCK_ZERO) && !bdrv_has_zero_init(bs)); | |
b6b8a333 PB |
3472 | } |
3473 | ||
188a7bbf PB |
3474 | /* |
3475 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3476 | * | |
3477 | * Return true if the given sector is allocated in any image between | |
3478 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3479 | * sector is allocated in any image of the chain. Return false otherwise. | |
3480 | * | |
3481 | * 'pnum' is set to the number of sectors (including and immediately following | |
3482 | * the specified sector) that are known to be in the same | |
3483 | * allocated/unallocated state. | |
3484 | * | |
3485 | */ | |
4f578637 PB |
3486 | int bdrv_is_allocated_above(BlockDriverState *top, |
3487 | BlockDriverState *base, | |
3488 | int64_t sector_num, | |
3489 | int nb_sectors, int *pnum) | |
188a7bbf PB |
3490 | { |
3491 | BlockDriverState *intermediate; | |
3492 | int ret, n = nb_sectors; | |
3493 | ||
3494 | intermediate = top; | |
3495 | while (intermediate && intermediate != base) { | |
3496 | int pnum_inter; | |
bdad13b9 PB |
3497 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
3498 | &pnum_inter); | |
188a7bbf PB |
3499 | if (ret < 0) { |
3500 | return ret; | |
3501 | } else if (ret) { | |
3502 | *pnum = pnum_inter; | |
3503 | return 1; | |
3504 | } | |
3505 | ||
3506 | /* | |
3507 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3508 | * might have | |
3509 | * | |
3510 | * [sector_num+x, nr_sectors] allocated. | |
3511 | */ | |
63ba17d3 VI |
3512 | if (n > pnum_inter && |
3513 | (intermediate == top || | |
3514 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3515 | n = pnum_inter; |
3516 | } | |
3517 | ||
3518 | intermediate = intermediate->backing_hd; | |
3519 | } | |
3520 | ||
3521 | *pnum = n; | |
3522 | return 0; | |
3523 | } | |
3524 | ||
045df330 AL |
3525 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3526 | { | |
3527 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3528 | return bs->backing_file; | |
3529 | else if (bs->encrypted) | |
3530 | return bs->filename; | |
3531 | else | |
3532 | return NULL; | |
3533 | } | |
3534 | ||
5fafdf24 | 3535 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3536 | char *filename, int filename_size) |
3537 | { | |
3574c608 | 3538 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3539 | } |
3540 | ||
5fafdf24 | 3541 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3542 | const uint8_t *buf, int nb_sectors) |
3543 | { | |
3544 | BlockDriver *drv = bs->drv; | |
3545 | if (!drv) | |
19cb3738 | 3546 | return -ENOMEDIUM; |
faea38e7 FB |
3547 | if (!drv->bdrv_write_compressed) |
3548 | return -ENOTSUP; | |
fbb7b4e0 KW |
3549 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3550 | return -EIO; | |
a55eb92c | 3551 | |
e4654d2d | 3552 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 3553 | |
faea38e7 FB |
3554 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3555 | } | |
3b46e624 | 3556 | |
faea38e7 FB |
3557 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3558 | { | |
3559 | BlockDriver *drv = bs->drv; | |
3560 | if (!drv) | |
19cb3738 | 3561 | return -ENOMEDIUM; |
faea38e7 FB |
3562 | if (!drv->bdrv_get_info) |
3563 | return -ENOTSUP; | |
3564 | memset(bdi, 0, sizeof(*bdi)); | |
3565 | return drv->bdrv_get_info(bs, bdi); | |
3566 | } | |
3567 | ||
eae041fe HR |
3568 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
3569 | { | |
3570 | BlockDriver *drv = bs->drv; | |
3571 | if (drv && drv->bdrv_get_specific_info) { | |
3572 | return drv->bdrv_get_specific_info(bs); | |
3573 | } | |
3574 | return NULL; | |
3575 | } | |
3576 | ||
45566e9c CH |
3577 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3578 | int64_t pos, int size) | |
cf8074b3 KW |
3579 | { |
3580 | QEMUIOVector qiov; | |
3581 | struct iovec iov = { | |
3582 | .iov_base = (void *) buf, | |
3583 | .iov_len = size, | |
3584 | }; | |
3585 | ||
3586 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3587 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3588 | } | |
3589 | ||
3590 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
3591 | { |
3592 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
3593 | |
3594 | if (!drv) { | |
178e08a5 | 3595 | return -ENOMEDIUM; |
cf8074b3 KW |
3596 | } else if (drv->bdrv_save_vmstate) { |
3597 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
3598 | } else if (bs->file) { | |
3599 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
3600 | } | |
3601 | ||
7cdb1f6d | 3602 | return -ENOTSUP; |
178e08a5 AL |
3603 | } |
3604 | ||
45566e9c CH |
3605 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3606 | int64_t pos, int size) | |
178e08a5 AL |
3607 | { |
3608 | BlockDriver *drv = bs->drv; | |
3609 | if (!drv) | |
3610 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3611 | if (drv->bdrv_load_vmstate) |
3612 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3613 | if (bs->file) | |
3614 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3615 | return -ENOTSUP; | |
178e08a5 AL |
3616 | } |
3617 | ||
8b9b0cc2 KW |
3618 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3619 | { | |
bf736fe3 | 3620 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
3621 | return; |
3622 | } | |
3623 | ||
bf736fe3 | 3624 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3625 | } |
3626 | ||
3627 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3628 | const char *tag) | |
3629 | { | |
3630 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3631 | bs = bs->file; | |
3632 | } | |
3633 | ||
3634 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3635 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3636 | } | |
3637 | ||
3638 | return -ENOTSUP; | |
3639 | } | |
3640 | ||
4cc70e93 FZ |
3641 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
3642 | { | |
3643 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
3644 | bs = bs->file; | |
3645 | } | |
3646 | ||
3647 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
3648 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
3649 | } | |
3650 | ||
3651 | return -ENOTSUP; | |
3652 | } | |
3653 | ||
41c695c7 KW |
3654 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
3655 | { | |
3656 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3657 | bs = bs->file; | |
3658 | } | |
8b9b0cc2 | 3659 | |
41c695c7 KW |
3660 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3661 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3662 | } | |
3663 | ||
3664 | return -ENOTSUP; | |
3665 | } | |
3666 | ||
3667 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3668 | { | |
3669 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3670 | bs = bs->file; | |
3671 | } | |
3672 | ||
3673 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3674 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3675 | } | |
3676 | ||
3677 | return false; | |
8b9b0cc2 KW |
3678 | } |
3679 | ||
199630b6 BS |
3680 | int bdrv_is_snapshot(BlockDriverState *bs) |
3681 | { | |
3682 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3683 | } | |
3684 | ||
b1b1d783 JC |
3685 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3686 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3687 | * from a BDS as backing_file should not be done, as that may be relative to | |
3688 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3689 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3690 | const char *backing_file) | |
3691 | { | |
b1b1d783 JC |
3692 | char *filename_full = NULL; |
3693 | char *backing_file_full = NULL; | |
3694 | char *filename_tmp = NULL; | |
3695 | int is_protocol = 0; | |
3696 | BlockDriverState *curr_bs = NULL; | |
3697 | BlockDriverState *retval = NULL; | |
3698 | ||
3699 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3700 | return NULL; |
3701 | } | |
3702 | ||
b1b1d783 JC |
3703 | filename_full = g_malloc(PATH_MAX); |
3704 | backing_file_full = g_malloc(PATH_MAX); | |
3705 | filename_tmp = g_malloc(PATH_MAX); | |
3706 | ||
3707 | is_protocol = path_has_protocol(backing_file); | |
3708 | ||
3709 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3710 | ||
3711 | /* If either of the filename paths is actually a protocol, then | |
3712 | * compare unmodified paths; otherwise make paths relative */ | |
3713 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3714 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3715 | retval = curr_bs->backing_hd; | |
3716 | break; | |
3717 | } | |
e8a6bb9c | 3718 | } else { |
b1b1d783 JC |
3719 | /* If not an absolute filename path, make it relative to the current |
3720 | * image's filename path */ | |
3721 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3722 | backing_file); | |
3723 | ||
3724 | /* We are going to compare absolute pathnames */ | |
3725 | if (!realpath(filename_tmp, filename_full)) { | |
3726 | continue; | |
3727 | } | |
3728 | ||
3729 | /* We need to make sure the backing filename we are comparing against | |
3730 | * is relative to the current image filename (or absolute) */ | |
3731 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3732 | curr_bs->backing_file); | |
3733 | ||
3734 | if (!realpath(filename_tmp, backing_file_full)) { | |
3735 | continue; | |
3736 | } | |
3737 | ||
3738 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3739 | retval = curr_bs->backing_hd; | |
3740 | break; | |
3741 | } | |
e8a6bb9c MT |
3742 | } |
3743 | } | |
3744 | ||
b1b1d783 JC |
3745 | g_free(filename_full); |
3746 | g_free(backing_file_full); | |
3747 | g_free(filename_tmp); | |
3748 | return retval; | |
e8a6bb9c MT |
3749 | } |
3750 | ||
f198fd1c BC |
3751 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3752 | { | |
3753 | if (!bs->drv) { | |
3754 | return 0; | |
3755 | } | |
3756 | ||
3757 | if (!bs->backing_hd) { | |
3758 | return 0; | |
3759 | } | |
3760 | ||
3761 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3762 | } | |
3763 | ||
79fac568 JC |
3764 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3765 | { | |
3766 | BlockDriverState *curr_bs = NULL; | |
3767 | ||
3768 | if (!bs) { | |
3769 | return NULL; | |
3770 | } | |
3771 | ||
3772 | curr_bs = bs; | |
3773 | ||
3774 | while (curr_bs->backing_hd) { | |
3775 | curr_bs = curr_bs->backing_hd; | |
3776 | } | |
3777 | return curr_bs; | |
3778 | } | |
3779 | ||
ea2384d3 | 3780 | /**************************************************************/ |
83f64091 | 3781 | /* async I/Os */ |
ea2384d3 | 3782 | |
3b69e4b9 | 3783 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3784 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3785 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3786 | { |
bbf0a440 SH |
3787 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3788 | ||
d20d9b7c | 3789 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 3790 | cb, opaque, false); |
ea2384d3 FB |
3791 | } |
3792 | ||
f141eafe AL |
3793 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3794 | QEMUIOVector *qiov, int nb_sectors, | |
3795 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3796 | { |
bbf0a440 SH |
3797 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3798 | ||
d20d9b7c | 3799 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 3800 | cb, opaque, true); |
83f64091 FB |
3801 | } |
3802 | ||
d5ef94d4 PB |
3803 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
3804 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
3805 | BlockDriverCompletionFunc *cb, void *opaque) | |
3806 | { | |
3807 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
3808 | ||
3809 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
3810 | BDRV_REQ_ZERO_WRITE | flags, | |
3811 | cb, opaque, true); | |
3812 | } | |
3813 | ||
40b4f539 KW |
3814 | |
3815 | typedef struct MultiwriteCB { | |
3816 | int error; | |
3817 | int num_requests; | |
3818 | int num_callbacks; | |
3819 | struct { | |
3820 | BlockDriverCompletionFunc *cb; | |
3821 | void *opaque; | |
3822 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3823 | } callbacks[]; |
3824 | } MultiwriteCB; | |
3825 | ||
3826 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3827 | { | |
3828 | int i; | |
3829 | ||
3830 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3831 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3832 | if (mcb->callbacks[i].free_qiov) { |
3833 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3834 | } | |
7267c094 | 3835 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3836 | } |
3837 | } | |
3838 | ||
3839 | static void multiwrite_cb(void *opaque, int ret) | |
3840 | { | |
3841 | MultiwriteCB *mcb = opaque; | |
3842 | ||
6d519a5f SH |
3843 | trace_multiwrite_cb(mcb, ret); |
3844 | ||
cb6d3ca0 | 3845 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3846 | mcb->error = ret; |
40b4f539 KW |
3847 | } |
3848 | ||
3849 | mcb->num_requests--; | |
3850 | if (mcb->num_requests == 0) { | |
de189a1b | 3851 | multiwrite_user_cb(mcb); |
7267c094 | 3852 | g_free(mcb); |
40b4f539 KW |
3853 | } |
3854 | } | |
3855 | ||
3856 | static int multiwrite_req_compare(const void *a, const void *b) | |
3857 | { | |
77be4366 CH |
3858 | const BlockRequest *req1 = a, *req2 = b; |
3859 | ||
3860 | /* | |
3861 | * Note that we can't simply subtract req2->sector from req1->sector | |
3862 | * here as that could overflow the return value. | |
3863 | */ | |
3864 | if (req1->sector > req2->sector) { | |
3865 | return 1; | |
3866 | } else if (req1->sector < req2->sector) { | |
3867 | return -1; | |
3868 | } else { | |
3869 | return 0; | |
3870 | } | |
40b4f539 KW |
3871 | } |
3872 | ||
3873 | /* | |
3874 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3875 | * requests that remain after merging. | |
3876 | */ | |
3877 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3878 | int num_reqs, MultiwriteCB *mcb) | |
3879 | { | |
3880 | int i, outidx; | |
3881 | ||
3882 | // Sort requests by start sector | |
3883 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3884 | ||
3885 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3886 | // filling up gaps with zero sectors. | |
3887 | outidx = 0; | |
3888 | for (i = 1; i < num_reqs; i++) { | |
3889 | int merge = 0; | |
3890 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3891 | ||
b6a127a1 | 3892 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3893 | if (reqs[i].sector <= oldreq_last) { |
3894 | merge = 1; | |
3895 | } | |
3896 | ||
e2a305fb CH |
3897 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3898 | merge = 0; | |
3899 | } | |
3900 | ||
40b4f539 KW |
3901 | if (merge) { |
3902 | size_t size; | |
7267c094 | 3903 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3904 | qemu_iovec_init(qiov, |
3905 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3906 | ||
3907 | // Add the first request to the merged one. If the requests are | |
3908 | // overlapping, drop the last sectors of the first request. | |
3909 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3910 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3911 | |
b6a127a1 PB |
3912 | // We should need to add any zeros between the two requests |
3913 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3914 | |
3915 | // Add the second request | |
1b093c48 | 3916 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3917 | |
cbf1dff2 | 3918 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3919 | reqs[outidx].qiov = qiov; |
3920 | ||
3921 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3922 | } else { | |
3923 | outidx++; | |
3924 | reqs[outidx].sector = reqs[i].sector; | |
3925 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3926 | reqs[outidx].qiov = reqs[i].qiov; | |
3927 | } | |
3928 | } | |
3929 | ||
3930 | return outidx + 1; | |
3931 | } | |
3932 | ||
3933 | /* | |
3934 | * Submit multiple AIO write requests at once. | |
3935 | * | |
3936 | * On success, the function returns 0 and all requests in the reqs array have | |
3937 | * been submitted. In error case this function returns -1, and any of the | |
3938 | * requests may or may not be submitted yet. In particular, this means that the | |
3939 | * callback will be called for some of the requests, for others it won't. The | |
3940 | * caller must check the error field of the BlockRequest to wait for the right | |
3941 | * callbacks (if error != 0, no callback will be called). | |
3942 | * | |
3943 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3944 | * requests. However, the fields opaque and error are left unmodified as they | |
3945 | * are used to signal failure for a single request to the caller. | |
3946 | */ | |
3947 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3948 | { | |
40b4f539 KW |
3949 | MultiwriteCB *mcb; |
3950 | int i; | |
3951 | ||
301db7c2 RH |
3952 | /* don't submit writes if we don't have a medium */ |
3953 | if (bs->drv == NULL) { | |
3954 | for (i = 0; i < num_reqs; i++) { | |
3955 | reqs[i].error = -ENOMEDIUM; | |
3956 | } | |
3957 | return -1; | |
3958 | } | |
3959 | ||
40b4f539 KW |
3960 | if (num_reqs == 0) { |
3961 | return 0; | |
3962 | } | |
3963 | ||
3964 | // Create MultiwriteCB structure | |
7267c094 | 3965 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3966 | mcb->num_requests = 0; |
3967 | mcb->num_callbacks = num_reqs; | |
3968 | ||
3969 | for (i = 0; i < num_reqs; i++) { | |
3970 | mcb->callbacks[i].cb = reqs[i].cb; | |
3971 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3972 | } | |
3973 | ||
3974 | // Check for mergable requests | |
3975 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3976 | ||
6d519a5f SH |
3977 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3978 | ||
df9309fb PB |
3979 | /* Run the aio requests. */ |
3980 | mcb->num_requests = num_reqs; | |
40b4f539 | 3981 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
3982 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
3983 | reqs[i].nb_sectors, reqs[i].flags, | |
3984 | multiwrite_cb, mcb, | |
3985 | true); | |
40b4f539 KW |
3986 | } |
3987 | ||
3988 | return 0; | |
40b4f539 KW |
3989 | } |
3990 | ||
83f64091 | 3991 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3992 | { |
d7331bed | 3993 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3994 | } |
3995 | ||
3996 | /**************************************************************/ | |
3997 | /* async block device emulation */ | |
3998 | ||
c16b5a2c CH |
3999 | typedef struct BlockDriverAIOCBSync { |
4000 | BlockDriverAIOCB common; | |
4001 | QEMUBH *bh; | |
4002 | int ret; | |
4003 | /* vector translation state */ | |
4004 | QEMUIOVector *qiov; | |
4005 | uint8_t *bounce; | |
4006 | int is_write; | |
4007 | } BlockDriverAIOCBSync; | |
4008 | ||
4009 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
4010 | { | |
b666d239 KW |
4011 | BlockDriverAIOCBSync *acb = |
4012 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 4013 | qemu_bh_delete(acb->bh); |
36afc451 | 4014 | acb->bh = NULL; |
c16b5a2c CH |
4015 | qemu_aio_release(acb); |
4016 | } | |
4017 | ||
d7331bed | 4018 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
4019 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
4020 | .cancel = bdrv_aio_cancel_em, | |
4021 | }; | |
4022 | ||
ce1a14dc | 4023 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4024 | { |
ce1a14dc | 4025 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4026 | |
f141eafe | 4027 | if (!acb->is_write) |
03396148 | 4028 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 4029 | qemu_vfree(acb->bounce); |
ce1a14dc | 4030 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4031 | qemu_bh_delete(acb->bh); |
36afc451 | 4032 | acb->bh = NULL; |
ce1a14dc | 4033 | qemu_aio_release(acb); |
83f64091 | 4034 | } |
beac80cd | 4035 | |
f141eafe AL |
4036 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4037 | int64_t sector_num, | |
4038 | QEMUIOVector *qiov, | |
4039 | int nb_sectors, | |
4040 | BlockDriverCompletionFunc *cb, | |
4041 | void *opaque, | |
4042 | int is_write) | |
4043 | ||
83f64091 | 4044 | { |
ce1a14dc | 4045 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4046 | |
d7331bed | 4047 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4048 | acb->is_write = is_write; |
4049 | acb->qiov = qiov; | |
e268ca52 | 4050 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 4051 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
4052 | |
4053 | if (is_write) { | |
d5e6b161 | 4054 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4055 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4056 | } else { |
1ed20acf | 4057 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4058 | } |
4059 | ||
ce1a14dc | 4060 | qemu_bh_schedule(acb->bh); |
f141eafe | 4061 | |
ce1a14dc | 4062 | return &acb->common; |
beac80cd FB |
4063 | } |
4064 | ||
f141eafe AL |
4065 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4066 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4067 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4068 | { |
f141eafe AL |
4069 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4070 | } | |
83f64091 | 4071 | |
f141eafe AL |
4072 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4073 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4074 | BlockDriverCompletionFunc *cb, void *opaque) | |
4075 | { | |
4076 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4077 | } |
beac80cd | 4078 | |
68485420 KW |
4079 | |
4080 | typedef struct BlockDriverAIOCBCoroutine { | |
4081 | BlockDriverAIOCB common; | |
4082 | BlockRequest req; | |
4083 | bool is_write; | |
d318aea9 | 4084 | bool *done; |
68485420 KW |
4085 | QEMUBH* bh; |
4086 | } BlockDriverAIOCBCoroutine; | |
4087 | ||
4088 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
4089 | { | |
d318aea9 KW |
4090 | BlockDriverAIOCBCoroutine *acb = |
4091 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
4092 | bool done = false; | |
4093 | ||
4094 | acb->done = &done; | |
4095 | while (!done) { | |
4096 | qemu_aio_wait(); | |
4097 | } | |
68485420 KW |
4098 | } |
4099 | ||
d7331bed | 4100 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
4101 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
4102 | .cancel = bdrv_aio_co_cancel_em, | |
4103 | }; | |
4104 | ||
35246a68 | 4105 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4106 | { |
4107 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4108 | ||
4109 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
4110 | |
4111 | if (acb->done) { | |
4112 | *acb->done = true; | |
4113 | } | |
4114 | ||
68485420 KW |
4115 | qemu_bh_delete(acb->bh); |
4116 | qemu_aio_release(acb); | |
4117 | } | |
4118 | ||
b2a61371 SH |
4119 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4120 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4121 | { | |
4122 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4123 | BlockDriverState *bs = acb->common.bs; | |
4124 | ||
4125 | if (!acb->is_write) { | |
4126 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4127 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4128 | } else { |
4129 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4130 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4131 | } |
4132 | ||
35246a68 | 4133 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
4134 | qemu_bh_schedule(acb->bh); |
4135 | } | |
4136 | ||
68485420 KW |
4137 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4138 | int64_t sector_num, | |
4139 | QEMUIOVector *qiov, | |
4140 | int nb_sectors, | |
d20d9b7c | 4141 | BdrvRequestFlags flags, |
68485420 KW |
4142 | BlockDriverCompletionFunc *cb, |
4143 | void *opaque, | |
8c5873d6 | 4144 | bool is_write) |
68485420 KW |
4145 | { |
4146 | Coroutine *co; | |
4147 | BlockDriverAIOCBCoroutine *acb; | |
4148 | ||
d7331bed | 4149 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4150 | acb->req.sector = sector_num; |
4151 | acb->req.nb_sectors = nb_sectors; | |
4152 | acb->req.qiov = qiov; | |
d20d9b7c | 4153 | acb->req.flags = flags; |
68485420 | 4154 | acb->is_write = is_write; |
d318aea9 | 4155 | acb->done = NULL; |
68485420 | 4156 | |
8c5873d6 | 4157 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4158 | qemu_coroutine_enter(co, acb); |
4159 | ||
4160 | return &acb->common; | |
4161 | } | |
4162 | ||
07f07615 | 4163 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4164 | { |
07f07615 PB |
4165 | BlockDriverAIOCBCoroutine *acb = opaque; |
4166 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4167 | |
07f07615 PB |
4168 | acb->req.error = bdrv_co_flush(bs); |
4169 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 4170 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4171 | } |
4172 | ||
07f07615 | 4173 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4174 | BlockDriverCompletionFunc *cb, void *opaque) |
4175 | { | |
07f07615 | 4176 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4177 | |
07f07615 PB |
4178 | Coroutine *co; |
4179 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4180 | |
d7331bed | 4181 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
4182 | acb->done = NULL; |
4183 | ||
07f07615 PB |
4184 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4185 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4186 | |
016f5cf6 AG |
4187 | return &acb->common; |
4188 | } | |
4189 | ||
4265d620 PB |
4190 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4191 | { | |
4192 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4193 | BlockDriverState *bs = acb->common.bs; | |
4194 | ||
4195 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
4196 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
4197 | qemu_bh_schedule(acb->bh); | |
4198 | } | |
4199 | ||
4200 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4201 | int64_t sector_num, int nb_sectors, | |
4202 | BlockDriverCompletionFunc *cb, void *opaque) | |
4203 | { | |
4204 | Coroutine *co; | |
4205 | BlockDriverAIOCBCoroutine *acb; | |
4206 | ||
4207 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4208 | ||
d7331bed | 4209 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4210 | acb->req.sector = sector_num; |
4211 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4212 | acb->done = NULL; |
4265d620 PB |
4213 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4214 | qemu_coroutine_enter(co, acb); | |
4215 | ||
4216 | return &acb->common; | |
4217 | } | |
4218 | ||
ea2384d3 FB |
4219 | void bdrv_init(void) |
4220 | { | |
5efa9d5a | 4221 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4222 | } |
ce1a14dc | 4223 | |
eb852011 MA |
4224 | void bdrv_init_with_whitelist(void) |
4225 | { | |
4226 | use_bdrv_whitelist = 1; | |
4227 | bdrv_init(); | |
4228 | } | |
4229 | ||
d7331bed | 4230 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4231 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4232 | { |
ce1a14dc PB |
4233 | BlockDriverAIOCB *acb; |
4234 | ||
d7331bed SH |
4235 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4236 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4237 | acb->bs = bs; |
4238 | acb->cb = cb; | |
4239 | acb->opaque = opaque; | |
4240 | return acb; | |
4241 | } | |
4242 | ||
4243 | void qemu_aio_release(void *p) | |
4244 | { | |
d37c975f | 4245 | BlockDriverAIOCB *acb = p; |
d7331bed | 4246 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4247 | } |
19cb3738 | 4248 | |
f9f05dc5 KW |
4249 | /**************************************************************/ |
4250 | /* Coroutine block device emulation */ | |
4251 | ||
4252 | typedef struct CoroutineIOCompletion { | |
4253 | Coroutine *coroutine; | |
4254 | int ret; | |
4255 | } CoroutineIOCompletion; | |
4256 | ||
4257 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4258 | { | |
4259 | CoroutineIOCompletion *co = opaque; | |
4260 | ||
4261 | co->ret = ret; | |
4262 | qemu_coroutine_enter(co->coroutine, NULL); | |
4263 | } | |
4264 | ||
4265 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4266 | int nb_sectors, QEMUIOVector *iov, | |
4267 | bool is_write) | |
4268 | { | |
4269 | CoroutineIOCompletion co = { | |
4270 | .coroutine = qemu_coroutine_self(), | |
4271 | }; | |
4272 | BlockDriverAIOCB *acb; | |
4273 | ||
4274 | if (is_write) { | |
a652d160 SH |
4275 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4276 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4277 | } else { |
a652d160 SH |
4278 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4279 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4280 | } |
4281 | ||
59370aaa | 4282 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4283 | if (!acb) { |
4284 | return -EIO; | |
4285 | } | |
4286 | qemu_coroutine_yield(); | |
4287 | ||
4288 | return co.ret; | |
4289 | } | |
4290 | ||
4291 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4292 | int64_t sector_num, int nb_sectors, | |
4293 | QEMUIOVector *iov) | |
4294 | { | |
4295 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4296 | } | |
4297 | ||
4298 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4299 | int64_t sector_num, int nb_sectors, | |
4300 | QEMUIOVector *iov) | |
4301 | { | |
4302 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4303 | } | |
4304 | ||
07f07615 | 4305 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4306 | { |
07f07615 PB |
4307 | RwCo *rwco = opaque; |
4308 | ||
4309 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4310 | } | |
4311 | ||
4312 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4313 | { | |
eb489bb1 KW |
4314 | int ret; |
4315 | ||
29cdb251 | 4316 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4317 | return 0; |
eb489bb1 KW |
4318 | } |
4319 | ||
ca716364 | 4320 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4321 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4322 | if (bs->drv->bdrv_co_flush_to_os) { |
4323 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4324 | if (ret < 0) { | |
4325 | return ret; | |
4326 | } | |
4327 | } | |
4328 | ||
ca716364 KW |
4329 | /* But don't actually force it to the disk with cache=unsafe */ |
4330 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4331 | goto flush_parent; |
ca716364 KW |
4332 | } |
4333 | ||
bf736fe3 | 4334 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4335 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4336 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4337 | } else if (bs->drv->bdrv_aio_flush) { |
4338 | BlockDriverAIOCB *acb; | |
4339 | CoroutineIOCompletion co = { | |
4340 | .coroutine = qemu_coroutine_self(), | |
4341 | }; | |
4342 | ||
4343 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4344 | if (acb == NULL) { | |
29cdb251 | 4345 | ret = -EIO; |
07f07615 PB |
4346 | } else { |
4347 | qemu_coroutine_yield(); | |
29cdb251 | 4348 | ret = co.ret; |
07f07615 | 4349 | } |
07f07615 PB |
4350 | } else { |
4351 | /* | |
4352 | * Some block drivers always operate in either writethrough or unsafe | |
4353 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4354 | * know how the server works (because the behaviour is hardcoded or | |
4355 | * depends on server-side configuration), so we can't ensure that | |
4356 | * everything is safe on disk. Returning an error doesn't work because | |
4357 | * that would break guests even if the server operates in writethrough | |
4358 | * mode. | |
4359 | * | |
4360 | * Let's hope the user knows what he's doing. | |
4361 | */ | |
29cdb251 | 4362 | ret = 0; |
07f07615 | 4363 | } |
29cdb251 PB |
4364 | if (ret < 0) { |
4365 | return ret; | |
4366 | } | |
4367 | ||
4368 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4369 | * in the case of cache=unsafe, so there are no useless flushes. | |
4370 | */ | |
d4c82329 | 4371 | flush_parent: |
29cdb251 | 4372 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4373 | } |
4374 | ||
0f15423c AL |
4375 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4376 | { | |
4377 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4378 | bs->drv->bdrv_invalidate_cache(bs); | |
4379 | } | |
4380 | } | |
4381 | ||
4382 | void bdrv_invalidate_cache_all(void) | |
4383 | { | |
4384 | BlockDriverState *bs; | |
4385 | ||
4386 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4387 | bdrv_invalidate_cache(bs); | |
4388 | } | |
4389 | } | |
4390 | ||
07789269 BC |
4391 | void bdrv_clear_incoming_migration_all(void) |
4392 | { | |
4393 | BlockDriverState *bs; | |
4394 | ||
4395 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4396 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4397 | } | |
4398 | } | |
4399 | ||
07f07615 PB |
4400 | int bdrv_flush(BlockDriverState *bs) |
4401 | { | |
4402 | Coroutine *co; | |
4403 | RwCo rwco = { | |
4404 | .bs = bs, | |
4405 | .ret = NOT_DONE, | |
e7a8a783 | 4406 | }; |
e7a8a783 | 4407 | |
07f07615 PB |
4408 | if (qemu_in_coroutine()) { |
4409 | /* Fast-path if already in coroutine context */ | |
4410 | bdrv_flush_co_entry(&rwco); | |
4411 | } else { | |
4412 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4413 | qemu_coroutine_enter(co, &rwco); | |
4414 | while (rwco.ret == NOT_DONE) { | |
4415 | qemu_aio_wait(); | |
4416 | } | |
e7a8a783 | 4417 | } |
07f07615 PB |
4418 | |
4419 | return rwco.ret; | |
e7a8a783 KW |
4420 | } |
4421 | ||
4265d620 PB |
4422 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4423 | { | |
4424 | RwCo *rwco = opaque; | |
4425 | ||
4426 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4427 | } | |
4428 | ||
6f14da52 PL |
4429 | /* if no limit is specified in the BlockLimits use a default |
4430 | * of 32768 512-byte sectors (16 MiB) per request. | |
4431 | */ | |
4432 | #define MAX_DISCARD_DEFAULT 32768 | |
4433 | ||
4265d620 PB |
4434 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
4435 | int nb_sectors) | |
4436 | { | |
d51e9fe5 PB |
4437 | int max_discard; |
4438 | ||
4265d620 PB |
4439 | if (!bs->drv) { |
4440 | return -ENOMEDIUM; | |
4441 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4442 | return -EIO; | |
4443 | } else if (bs->read_only) { | |
4444 | return -EROFS; | |
df702c9b PB |
4445 | } |
4446 | ||
e4654d2d | 4447 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 4448 | |
9e8f1835 PB |
4449 | /* Do nothing if disabled. */ |
4450 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4451 | return 0; | |
4452 | } | |
4453 | ||
d51e9fe5 PB |
4454 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
4455 | return 0; | |
4456 | } | |
6f14da52 | 4457 | |
d51e9fe5 PB |
4458 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
4459 | while (nb_sectors > 0) { | |
4460 | int ret; | |
4461 | int num = nb_sectors; | |
6f14da52 | 4462 | |
d51e9fe5 PB |
4463 | /* align request */ |
4464 | if (bs->bl.discard_alignment && | |
4465 | num >= bs->bl.discard_alignment && | |
4466 | sector_num % bs->bl.discard_alignment) { | |
4467 | if (num > bs->bl.discard_alignment) { | |
4468 | num = bs->bl.discard_alignment; | |
6f14da52 | 4469 | } |
d51e9fe5 PB |
4470 | num -= sector_num % bs->bl.discard_alignment; |
4471 | } | |
6f14da52 | 4472 | |
d51e9fe5 PB |
4473 | /* limit request size */ |
4474 | if (num > max_discard) { | |
4475 | num = max_discard; | |
4476 | } | |
6f14da52 | 4477 | |
d51e9fe5 | 4478 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 4479 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
4480 | } else { |
4481 | BlockDriverAIOCB *acb; | |
4482 | CoroutineIOCompletion co = { | |
4483 | .coroutine = qemu_coroutine_self(), | |
4484 | }; | |
4485 | ||
4486 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4487 | bdrv_co_io_em_complete, &co); | |
4488 | if (acb == NULL) { | |
4489 | return -EIO; | |
4490 | } else { | |
4491 | qemu_coroutine_yield(); | |
4492 | ret = co.ret; | |
6f14da52 | 4493 | } |
6f14da52 | 4494 | } |
7ce21016 | 4495 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 4496 | return ret; |
4265d620 | 4497 | } |
d51e9fe5 PB |
4498 | |
4499 | sector_num += num; | |
4500 | nb_sectors -= num; | |
4265d620 | 4501 | } |
d51e9fe5 | 4502 | return 0; |
4265d620 PB |
4503 | } |
4504 | ||
4505 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4506 | { | |
4507 | Coroutine *co; | |
4508 | RwCo rwco = { | |
4509 | .bs = bs, | |
4510 | .sector_num = sector_num, | |
4511 | .nb_sectors = nb_sectors, | |
4512 | .ret = NOT_DONE, | |
4513 | }; | |
4514 | ||
4515 | if (qemu_in_coroutine()) { | |
4516 | /* Fast-path if already in coroutine context */ | |
4517 | bdrv_discard_co_entry(&rwco); | |
4518 | } else { | |
4519 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4520 | qemu_coroutine_enter(co, &rwco); | |
4521 | while (rwco.ret == NOT_DONE) { | |
4522 | qemu_aio_wait(); | |
4523 | } | |
4524 | } | |
4525 | ||
4526 | return rwco.ret; | |
4527 | } | |
4528 | ||
19cb3738 FB |
4529 | /**************************************************************/ |
4530 | /* removable device support */ | |
4531 | ||
4532 | /** | |
4533 | * Return TRUE if the media is present | |
4534 | */ | |
4535 | int bdrv_is_inserted(BlockDriverState *bs) | |
4536 | { | |
4537 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4538 | |
19cb3738 FB |
4539 | if (!drv) |
4540 | return 0; | |
4541 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4542 | return 1; |
4543 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4544 | } |
4545 | ||
4546 | /** | |
8e49ca46 MA |
4547 | * Return whether the media changed since the last call to this |
4548 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4549 | */ |
4550 | int bdrv_media_changed(BlockDriverState *bs) | |
4551 | { | |
4552 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4553 | |
8e49ca46 MA |
4554 | if (drv && drv->bdrv_media_changed) { |
4555 | return drv->bdrv_media_changed(bs); | |
4556 | } | |
4557 | return -ENOTSUP; | |
19cb3738 FB |
4558 | } |
4559 | ||
4560 | /** | |
4561 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4562 | */ | |
f36f3949 | 4563 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4564 | { |
4565 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4566 | |
822e1cd1 MA |
4567 | if (drv && drv->bdrv_eject) { |
4568 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4569 | } |
6f382ed2 LC |
4570 | |
4571 | if (bs->device_name[0] != '\0') { | |
4572 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4573 | } | |
19cb3738 FB |
4574 | } |
4575 | ||
19cb3738 FB |
4576 | /** |
4577 | * Lock or unlock the media (if it is locked, the user won't be able | |
4578 | * to eject it manually). | |
4579 | */ | |
025e849a | 4580 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4581 | { |
4582 | BlockDriver *drv = bs->drv; | |
4583 | ||
025e849a | 4584 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4585 | |
025e849a MA |
4586 | if (drv && drv->bdrv_lock_medium) { |
4587 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4588 | } |
4589 | } | |
985a03b0 TS |
4590 | |
4591 | /* needed for generic scsi interface */ | |
4592 | ||
4593 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4594 | { | |
4595 | BlockDriver *drv = bs->drv; | |
4596 | ||
4597 | if (drv && drv->bdrv_ioctl) | |
4598 | return drv->bdrv_ioctl(bs, req, buf); | |
4599 | return -ENOTSUP; | |
4600 | } | |
7d780669 | 4601 | |
221f715d AL |
4602 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4603 | unsigned long int req, void *buf, | |
4604 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4605 | { |
221f715d | 4606 | BlockDriver *drv = bs->drv; |
7d780669 | 4607 | |
221f715d AL |
4608 | if (drv && drv->bdrv_aio_ioctl) |
4609 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4610 | return NULL; | |
7d780669 | 4611 | } |
e268ca52 | 4612 | |
7b6f9300 MA |
4613 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4614 | { | |
4615 | bs->buffer_alignment = align; | |
4616 | } | |
7cd1e32a | 4617 | |
e268ca52 AL |
4618 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4619 | { | |
4620 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4621 | } | |
7cd1e32a | 4622 | |
c53b1c51 SH |
4623 | /* |
4624 | * Check if all memory in this vector is sector aligned. | |
4625 | */ | |
4626 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4627 | { | |
4628 | int i; | |
4629 | ||
4630 | for (i = 0; i < qiov->niov; i++) { | |
4631 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4632 | return false; | |
4633 | } | |
4634 | } | |
4635 | ||
4636 | return true; | |
4637 | } | |
4638 | ||
e4654d2d | 4639 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity) |
7cd1e32a LS |
4640 | { |
4641 | int64_t bitmap_size; | |
e4654d2d | 4642 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 4643 | |
50717e94 PB |
4644 | assert((granularity & (granularity - 1)) == 0); |
4645 | ||
e4654d2d FZ |
4646 | granularity >>= BDRV_SECTOR_BITS; |
4647 | assert(granularity); | |
4648 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4649 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); | |
4650 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
4651 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
4652 | return bitmap; | |
4653 | } | |
4654 | ||
4655 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
4656 | { | |
4657 | BdrvDirtyBitmap *bm, *next; | |
4658 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
4659 | if (bm == bitmap) { | |
4660 | QLIST_REMOVE(bitmap, list); | |
4661 | hbitmap_free(bitmap->bitmap); | |
4662 | g_free(bitmap); | |
4663 | return; | |
a55eb92c | 4664 | } |
7cd1e32a LS |
4665 | } |
4666 | } | |
4667 | ||
21b56835 FZ |
4668 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
4669 | { | |
4670 | BdrvDirtyBitmap *bm; | |
4671 | BlockDirtyInfoList *list = NULL; | |
4672 | BlockDirtyInfoList **plist = &list; | |
4673 | ||
4674 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
4675 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); | |
4676 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); | |
4677 | info->count = bdrv_get_dirty_count(bs, bm); | |
4678 | info->granularity = | |
4679 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
4680 | entry->value = info; | |
4681 | *plist = entry; | |
4682 | plist = &entry->next; | |
4683 | } | |
4684 | ||
4685 | return list; | |
4686 | } | |
4687 | ||
e4654d2d | 4688 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 4689 | { |
e4654d2d FZ |
4690 | if (bitmap) { |
4691 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
4692 | } else { |
4693 | return 0; | |
4694 | } | |
4695 | } | |
4696 | ||
e4654d2d FZ |
4697 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
4698 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 4699 | { |
e4654d2d | 4700 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
4701 | } |
4702 | ||
4703 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4704 | int nr_sectors) | |
4705 | { | |
e4654d2d FZ |
4706 | BdrvDirtyBitmap *bitmap; |
4707 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
4708 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
4709 | } | |
1755da16 PB |
4710 | } |
4711 | ||
e4654d2d | 4712 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 4713 | { |
e4654d2d FZ |
4714 | BdrvDirtyBitmap *bitmap; |
4715 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
4716 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
4717 | } | |
7cd1e32a | 4718 | } |
aaa0eb75 | 4719 | |
e4654d2d | 4720 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 4721 | { |
e4654d2d | 4722 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 4723 | } |
f88e1a42 | 4724 | |
9fcb0251 FZ |
4725 | /* Get a reference to bs */ |
4726 | void bdrv_ref(BlockDriverState *bs) | |
4727 | { | |
4728 | bs->refcnt++; | |
4729 | } | |
4730 | ||
4731 | /* Release a previously grabbed reference to bs. | |
4732 | * If after releasing, reference count is zero, the BlockDriverState is | |
4733 | * deleted. */ | |
4734 | void bdrv_unref(BlockDriverState *bs) | |
4735 | { | |
4736 | assert(bs->refcnt > 0); | |
4737 | if (--bs->refcnt == 0) { | |
4738 | bdrv_delete(bs); | |
4739 | } | |
4740 | } | |
4741 | ||
db593f25 MT |
4742 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4743 | { | |
4744 | assert(bs->in_use != in_use); | |
4745 | bs->in_use = in_use; | |
4746 | } | |
4747 | ||
4748 | int bdrv_in_use(BlockDriverState *bs) | |
4749 | { | |
4750 | return bs->in_use; | |
4751 | } | |
4752 | ||
28a7282a LC |
4753 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4754 | { | |
d6bf279e | 4755 | bs->iostatus_enabled = true; |
58e21ef5 | 4756 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4757 | } |
4758 | ||
4759 | /* The I/O status is only enabled if the drive explicitly | |
4760 | * enables it _and_ the VM is configured to stop on errors */ | |
4761 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4762 | { | |
d6bf279e | 4763 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4764 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4765 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4766 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4767 | } |
4768 | ||
4769 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4770 | { | |
d6bf279e | 4771 | bs->iostatus_enabled = false; |
28a7282a LC |
4772 | } |
4773 | ||
4774 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4775 | { | |
4776 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4777 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4778 | if (bs->job) { |
4779 | block_job_iostatus_reset(bs->job); | |
4780 | } | |
28a7282a LC |
4781 | } |
4782 | } | |
4783 | ||
28a7282a LC |
4784 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4785 | { | |
3e1caa5f PB |
4786 | assert(bdrv_iostatus_is_enabled(bs)); |
4787 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4788 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4789 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4790 | } |
4791 | } | |
4792 | ||
a597e79c CH |
4793 | void |
4794 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4795 | enum BlockAcctType type) | |
4796 | { | |
4797 | assert(type < BDRV_MAX_IOTYPE); | |
4798 | ||
4799 | cookie->bytes = bytes; | |
c488c7f6 | 4800 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4801 | cookie->type = type; |
4802 | } | |
4803 | ||
4804 | void | |
4805 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4806 | { | |
4807 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4808 | ||
4809 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4810 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4811 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4812 | } |
4813 | ||
d92ada22 LC |
4814 | void bdrv_img_create(const char *filename, const char *fmt, |
4815 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4816 | char *options, uint64_t img_size, int flags, |
4817 | Error **errp, bool quiet) | |
f88e1a42 JS |
4818 | { |
4819 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4820 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 | 4821 | BlockDriver *drv, *proto_drv; |
96df67d1 | 4822 | BlockDriver *backing_drv = NULL; |
cc84d90f | 4823 | Error *local_err = NULL; |
f88e1a42 JS |
4824 | int ret = 0; |
4825 | ||
4826 | /* Find driver and parse its options */ | |
4827 | drv = bdrv_find_format(fmt); | |
4828 | if (!drv) { | |
71c79813 | 4829 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4830 | return; |
f88e1a42 JS |
4831 | } |
4832 | ||
98289620 | 4833 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 4834 | if (!proto_drv) { |
71c79813 | 4835 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4836 | return; |
f88e1a42 JS |
4837 | } |
4838 | ||
4839 | create_options = append_option_parameters(create_options, | |
4840 | drv->create_options); | |
4841 | create_options = append_option_parameters(create_options, | |
4842 | proto_drv->create_options); | |
4843 | ||
4844 | /* Create parameter list with default values */ | |
4845 | param = parse_option_parameters("", create_options, param); | |
4846 | ||
4847 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4848 | ||
4849 | /* Parse -o options */ | |
4850 | if (options) { | |
4851 | param = parse_option_parameters(options, create_options, param); | |
4852 | if (param == NULL) { | |
71c79813 | 4853 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4854 | goto out; |
4855 | } | |
4856 | } | |
4857 | ||
4858 | if (base_filename) { | |
4859 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4860 | base_filename)) { | |
71c79813 LC |
4861 | error_setg(errp, "Backing file not supported for file format '%s'", |
4862 | fmt); | |
f88e1a42 JS |
4863 | goto out; |
4864 | } | |
4865 | } | |
4866 | ||
4867 | if (base_fmt) { | |
4868 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4869 | error_setg(errp, "Backing file format not supported for file " |
4870 | "format '%s'", fmt); | |
f88e1a42 JS |
4871 | goto out; |
4872 | } | |
4873 | } | |
4874 | ||
792da93a JS |
4875 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4876 | if (backing_file && backing_file->value.s) { | |
4877 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4878 | error_setg(errp, "Error: Trying to create an image with the " |
4879 | "same filename as the backing file"); | |
792da93a JS |
4880 | goto out; |
4881 | } | |
4882 | } | |
4883 | ||
f88e1a42 JS |
4884 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4885 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4886 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4887 | if (!backing_drv) { | |
71c79813 LC |
4888 | error_setg(errp, "Unknown backing file format '%s'", |
4889 | backing_fmt->value.s); | |
f88e1a42 JS |
4890 | goto out; |
4891 | } | |
4892 | } | |
4893 | ||
4894 | // The size for the image must always be specified, with one exception: | |
4895 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4896 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4897 | if (size && size->value.n == -1) { | |
f88e1a42 | 4898 | if (backing_file && backing_file->value.s) { |
66f6b814 | 4899 | BlockDriverState *bs; |
f88e1a42 | 4900 | uint64_t size; |
f88e1a42 | 4901 | char buf[32]; |
63090dac PB |
4902 | int back_flags; |
4903 | ||
4904 | /* backing files always opened read-only */ | |
4905 | back_flags = | |
4906 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4907 | |
f88e1a42 JS |
4908 | bs = bdrv_new(""); |
4909 | ||
de9c0cec | 4910 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
cc84d90f | 4911 | backing_drv, &local_err); |
f88e1a42 | 4912 | if (ret < 0) { |
cc84d90f HR |
4913 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
4914 | backing_file->value.s, | |
4915 | error_get_pretty(local_err)); | |
4916 | error_free(local_err); | |
4917 | local_err = NULL; | |
66f6b814 | 4918 | bdrv_unref(bs); |
f88e1a42 JS |
4919 | goto out; |
4920 | } | |
4921 | bdrv_get_geometry(bs, &size); | |
4922 | size *= 512; | |
4923 | ||
4924 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4925 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
66f6b814 HR |
4926 | |
4927 | bdrv_unref(bs); | |
f88e1a42 | 4928 | } else { |
71c79813 | 4929 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4930 | goto out; |
4931 | } | |
4932 | } | |
4933 | ||
f382d43a MR |
4934 | if (!quiet) { |
4935 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4936 | print_option_parameters(param); | |
4937 | puts(""); | |
4938 | } | |
cc84d90f HR |
4939 | ret = bdrv_create(drv, filename, param, &local_err); |
4940 | if (ret == -EFBIG) { | |
4941 | /* This is generally a better message than whatever the driver would | |
4942 | * deliver (especially because of the cluster_size_hint), since that | |
4943 | * is most probably not much different from "image too large". */ | |
4944 | const char *cluster_size_hint = ""; | |
4945 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
4946 | cluster_size_hint = " (try using a larger cluster size)"; | |
f88e1a42 | 4947 | } |
cc84d90f HR |
4948 | error_setg(errp, "The image size is too large for file format '%s'" |
4949 | "%s", fmt, cluster_size_hint); | |
4950 | error_free(local_err); | |
4951 | local_err = NULL; | |
f88e1a42 JS |
4952 | } |
4953 | ||
4954 | out: | |
4955 | free_option_parameters(create_options); | |
4956 | free_option_parameters(param); | |
4957 | ||
cc84d90f HR |
4958 | if (error_is_set(&local_err)) { |
4959 | error_propagate(errp, local_err); | |
4960 | } | |
f88e1a42 | 4961 | } |
85d126f3 SH |
4962 | |
4963 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
4964 | { | |
4965 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
4966 | return qemu_get_aio_context(); | |
4967 | } | |
d616b224 SH |
4968 | |
4969 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
4970 | NotifierWithReturn *notifier) | |
4971 | { | |
4972 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
4973 | } | |
6f176b48 HR |
4974 | |
4975 | int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options) | |
4976 | { | |
4977 | if (bs->drv->bdrv_amend_options == NULL) { | |
4978 | return -ENOTSUP; | |
4979 | } | |
4980 | return bs->drv->bdrv_amend_options(bs, options); | |
4981 | } | |
f6186f49 BC |
4982 | |
4983 | ExtSnapshotPerm bdrv_check_ext_snapshot(BlockDriverState *bs) | |
4984 | { | |
4985 | if (bs->drv->bdrv_check_ext_snapshot) { | |
4986 | return bs->drv->bdrv_check_ext_snapshot(bs); | |
4987 | } | |
4988 | ||
4989 | if (bs->file && bs->file->drv && bs->file->drv->bdrv_check_ext_snapshot) { | |
4990 | return bs->file->drv->bdrv_check_ext_snapshot(bs); | |
4991 | } | |
4992 | ||
4993 | /* external snapshots are allowed by default */ | |
4994 | return EXT_SNAPSHOT_ALLOWED; | |
4995 | } | |
4996 | ||
4997 | ExtSnapshotPerm bdrv_check_ext_snapshot_forbidden(BlockDriverState *bs) | |
4998 | { | |
4999 | return EXT_SNAPSHOT_FORBIDDEN; | |
5000 | } |