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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 | ||
1c9805a3 SH |
52 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
53 | ||
470c0504 SH |
54 | typedef enum { |
55 | BDRV_REQ_COPY_ON_READ = 0x1, | |
f08f2dda | 56 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
57 | } BdrvRequestFlags; |
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, | |
82 | BlockDriverCompletionFunc *cb, | |
83 | void *opaque, | |
8c5873d6 | 84 | bool is_write); |
b2a61371 | 85 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
86 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
87 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 88 | |
1b7bdbc1 SH |
89 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
90 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 91 | |
8a22f02a SH |
92 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
93 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 94 | |
eb852011 MA |
95 | /* If non-zero, use only whitelisted block drivers */ |
96 | static int use_bdrv_whitelist; | |
97 | ||
9e0b22f4 SH |
98 | #ifdef _WIN32 |
99 | static int is_windows_drive_prefix(const char *filename) | |
100 | { | |
101 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
102 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
103 | filename[1] == ':'); | |
104 | } | |
105 | ||
106 | int is_windows_drive(const char *filename) | |
107 | { | |
108 | if (is_windows_drive_prefix(filename) && | |
109 | filename[2] == '\0') | |
110 | return 1; | |
111 | if (strstart(filename, "\\\\.\\", NULL) || | |
112 | strstart(filename, "//./", NULL)) | |
113 | return 1; | |
114 | return 0; | |
115 | } | |
116 | #endif | |
117 | ||
0563e191 | 118 | /* throttling disk I/O limits */ |
cc0681c4 BC |
119 | void bdrv_set_io_limits(BlockDriverState *bs, |
120 | ThrottleConfig *cfg) | |
98f90dba | 121 | { |
cc0681c4 | 122 | int i; |
98f90dba | 123 | |
cc0681c4 | 124 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 125 | |
cc0681c4 BC |
126 | for (i = 0; i < 2; i++) { |
127 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 128 | } |
cc0681c4 BC |
129 | } |
130 | ||
131 | /* this function drain all the throttled IOs */ | |
132 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
133 | { | |
134 | bool drained = false; | |
135 | bool enabled = bs->io_limits_enabled; | |
136 | int i; | |
137 | ||
138 | bs->io_limits_enabled = false; | |
139 | ||
140 | for (i = 0; i < 2; i++) { | |
141 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
142 | drained = true; | |
143 | } | |
144 | } | |
145 | ||
146 | bs->io_limits_enabled = enabled; | |
98f90dba | 147 | |
cc0681c4 | 148 | return drained; |
98f90dba ZYW |
149 | } |
150 | ||
cc0681c4 | 151 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 152 | { |
cc0681c4 | 153 | bs->io_limits_enabled = false; |
0563e191 | 154 | |
cc0681c4 BC |
155 | bdrv_start_throttled_reqs(bs); |
156 | ||
157 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
158 | } |
159 | ||
cc0681c4 | 160 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 161 | { |
cc0681c4 BC |
162 | BlockDriverState *bs = opaque; |
163 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
164 | } |
165 | ||
cc0681c4 | 166 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 167 | { |
cc0681c4 BC |
168 | BlockDriverState *bs = opaque; |
169 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
170 | } |
171 | ||
cc0681c4 BC |
172 | /* should be called before bdrv_set_io_limits if a limit is set */ |
173 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
174 | { | |
175 | assert(!bs->io_limits_enabled); | |
176 | throttle_init(&bs->throttle_state, | |
177 | QEMU_CLOCK_VIRTUAL, | |
178 | bdrv_throttle_read_timer_cb, | |
179 | bdrv_throttle_write_timer_cb, | |
180 | bs); | |
181 | bs->io_limits_enabled = true; | |
182 | } | |
183 | ||
184 | /* This function makes an IO wait if needed | |
185 | * | |
186 | * @nb_sectors: the number of sectors of the IO | |
187 | * @is_write: is the IO a write | |
188 | */ | |
98f90dba | 189 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
cc0681c4 BC |
190 | int nb_sectors, |
191 | bool is_write) | |
98f90dba | 192 | { |
cc0681c4 BC |
193 | /* does this io must wait */ |
194 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 195 | |
cc0681c4 BC |
196 | /* if must wait or any request of this type throttled queue the IO */ |
197 | if (must_wait || | |
198 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
199 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
200 | } |
201 | ||
cc0681c4 BC |
202 | /* the IO will be executed, do the accounting */ |
203 | throttle_account(&bs->throttle_state, | |
204 | is_write, | |
205 | nb_sectors * BDRV_SECTOR_SIZE); | |
98f90dba | 206 | |
cc0681c4 BC |
207 | /* if the next request must wait -> do nothing */ |
208 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
209 | return; | |
98f90dba ZYW |
210 | } |
211 | ||
cc0681c4 BC |
212 | /* else queue next request for execution */ |
213 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
214 | } |
215 | ||
9e0b22f4 SH |
216 | /* check if the path starts with "<protocol>:" */ |
217 | static int path_has_protocol(const char *path) | |
218 | { | |
947995c0 PB |
219 | const char *p; |
220 | ||
9e0b22f4 SH |
221 | #ifdef _WIN32 |
222 | if (is_windows_drive(path) || | |
223 | is_windows_drive_prefix(path)) { | |
224 | return 0; | |
225 | } | |
947995c0 PB |
226 | p = path + strcspn(path, ":/\\"); |
227 | #else | |
228 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
229 | #endif |
230 | ||
947995c0 | 231 | return *p == ':'; |
9e0b22f4 SH |
232 | } |
233 | ||
83f64091 | 234 | int path_is_absolute(const char *path) |
3b0d4f61 | 235 | { |
21664424 FB |
236 | #ifdef _WIN32 |
237 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 238 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 239 | return 1; |
f53f4da9 PB |
240 | } |
241 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 242 | #else |
f53f4da9 | 243 | return (*path == '/'); |
3b9f94e1 | 244 | #endif |
3b0d4f61 FB |
245 | } |
246 | ||
83f64091 FB |
247 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
248 | path to it by considering it is relative to base_path. URL are | |
249 | supported. */ | |
250 | void path_combine(char *dest, int dest_size, | |
251 | const char *base_path, | |
252 | const char *filename) | |
3b0d4f61 | 253 | { |
83f64091 FB |
254 | const char *p, *p1; |
255 | int len; | |
256 | ||
257 | if (dest_size <= 0) | |
258 | return; | |
259 | if (path_is_absolute(filename)) { | |
260 | pstrcpy(dest, dest_size, filename); | |
261 | } else { | |
262 | p = strchr(base_path, ':'); | |
263 | if (p) | |
264 | p++; | |
265 | else | |
266 | p = base_path; | |
3b9f94e1 FB |
267 | p1 = strrchr(base_path, '/'); |
268 | #ifdef _WIN32 | |
269 | { | |
270 | const char *p2; | |
271 | p2 = strrchr(base_path, '\\'); | |
272 | if (!p1 || p2 > p1) | |
273 | p1 = p2; | |
274 | } | |
275 | #endif | |
83f64091 FB |
276 | if (p1) |
277 | p1++; | |
278 | else | |
279 | p1 = base_path; | |
280 | if (p1 > p) | |
281 | p = p1; | |
282 | len = p - base_path; | |
283 | if (len > dest_size - 1) | |
284 | len = dest_size - 1; | |
285 | memcpy(dest, base_path, len); | |
286 | dest[len] = '\0'; | |
287 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 288 | } |
3b0d4f61 FB |
289 | } |
290 | ||
dc5a1371 PB |
291 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
292 | { | |
293 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
294 | pstrcpy(dest, sz, bs->backing_file); | |
295 | } else { | |
296 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
297 | } | |
298 | } | |
299 | ||
5efa9d5a | 300 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 301 | { |
8c5873d6 SH |
302 | /* Block drivers without coroutine functions need emulation */ |
303 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
304 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
305 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
306 | ||
f8c35c1d SH |
307 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
308 | * the block driver lacks aio we need to emulate that too. | |
309 | */ | |
f9f05dc5 KW |
310 | if (!bdrv->bdrv_aio_readv) { |
311 | /* add AIO emulation layer */ | |
312 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
313 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 314 | } |
83f64091 | 315 | } |
b2e12bc6 | 316 | |
8a22f02a | 317 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 318 | } |
b338082b FB |
319 | |
320 | /* create a new block device (by default it is empty) */ | |
321 | BlockDriverState *bdrv_new(const char *device_name) | |
322 | { | |
1b7bdbc1 | 323 | BlockDriverState *bs; |
b338082b | 324 | |
7267c094 | 325 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 326 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 327 | if (device_name[0] != '\0') { |
1b7bdbc1 | 328 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 329 | } |
28a7282a | 330 | bdrv_iostatus_disable(bs); |
d7d512f6 | 331 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 332 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
333 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
334 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 335 | bs->refcnt = 1; |
d7d512f6 | 336 | |
b338082b FB |
337 | return bs; |
338 | } | |
339 | ||
d7d512f6 PB |
340 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
341 | { | |
342 | notifier_list_add(&bs->close_notifiers, notify); | |
343 | } | |
344 | ||
ea2384d3 FB |
345 | BlockDriver *bdrv_find_format(const char *format_name) |
346 | { | |
347 | BlockDriver *drv1; | |
8a22f02a SH |
348 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
349 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 350 | return drv1; |
8a22f02a | 351 | } |
ea2384d3 FB |
352 | } |
353 | return NULL; | |
354 | } | |
355 | ||
b64ec4e4 | 356 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 357 | { |
b64ec4e4 FZ |
358 | static const char *whitelist_rw[] = { |
359 | CONFIG_BDRV_RW_WHITELIST | |
360 | }; | |
361 | static const char *whitelist_ro[] = { | |
362 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
363 | }; |
364 | const char **p; | |
365 | ||
b64ec4e4 | 366 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 367 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 368 | } |
eb852011 | 369 | |
b64ec4e4 | 370 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
371 | if (!strcmp(drv->format_name, *p)) { |
372 | return 1; | |
373 | } | |
374 | } | |
b64ec4e4 FZ |
375 | if (read_only) { |
376 | for (p = whitelist_ro; *p; p++) { | |
377 | if (!strcmp(drv->format_name, *p)) { | |
378 | return 1; | |
379 | } | |
380 | } | |
381 | } | |
eb852011 MA |
382 | return 0; |
383 | } | |
384 | ||
b64ec4e4 FZ |
385 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
386 | bool read_only) | |
eb852011 MA |
387 | { |
388 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 389 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
390 | } |
391 | ||
5b7e1542 ZYW |
392 | typedef struct CreateCo { |
393 | BlockDriver *drv; | |
394 | char *filename; | |
395 | QEMUOptionParameter *options; | |
396 | int ret; | |
397 | } CreateCo; | |
398 | ||
399 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
400 | { | |
401 | CreateCo *cco = opaque; | |
402 | assert(cco->drv); | |
403 | ||
404 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
405 | } | |
406 | ||
0e7e1989 KW |
407 | int bdrv_create(BlockDriver *drv, const char* filename, |
408 | QEMUOptionParameter *options) | |
ea2384d3 | 409 | { |
5b7e1542 ZYW |
410 | int ret; |
411 | ||
412 | Coroutine *co; | |
413 | CreateCo cco = { | |
414 | .drv = drv, | |
415 | .filename = g_strdup(filename), | |
416 | .options = options, | |
417 | .ret = NOT_DONE, | |
418 | }; | |
419 | ||
420 | if (!drv->bdrv_create) { | |
80168bff LC |
421 | ret = -ENOTSUP; |
422 | goto out; | |
5b7e1542 ZYW |
423 | } |
424 | ||
425 | if (qemu_in_coroutine()) { | |
426 | /* Fast-path if already in coroutine context */ | |
427 | bdrv_create_co_entry(&cco); | |
428 | } else { | |
429 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
430 | qemu_coroutine_enter(co, &cco); | |
431 | while (cco.ret == NOT_DONE) { | |
432 | qemu_aio_wait(); | |
433 | } | |
434 | } | |
435 | ||
436 | ret = cco.ret; | |
0e7e1989 | 437 | |
80168bff LC |
438 | out: |
439 | g_free(cco.filename); | |
5b7e1542 | 440 | return ret; |
ea2384d3 FB |
441 | } |
442 | ||
84a12e66 CH |
443 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
444 | { | |
445 | BlockDriver *drv; | |
446 | ||
98289620 | 447 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 448 | if (drv == NULL) { |
16905d71 | 449 | return -ENOENT; |
84a12e66 CH |
450 | } |
451 | ||
452 | return bdrv_create(drv, filename, options); | |
453 | } | |
454 | ||
eba25057 JM |
455 | /* |
456 | * Create a uniquely-named empty temporary file. | |
457 | * Return 0 upon success, otherwise a negative errno value. | |
458 | */ | |
459 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 460 | { |
eba25057 | 461 | #ifdef _WIN32 |
3b9f94e1 | 462 | char temp_dir[MAX_PATH]; |
eba25057 JM |
463 | /* GetTempFileName requires that its output buffer (4th param) |
464 | have length MAX_PATH or greater. */ | |
465 | assert(size >= MAX_PATH); | |
466 | return (GetTempPath(MAX_PATH, temp_dir) | |
467 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
468 | ? 0 : -GetLastError()); | |
d5249393 | 469 | #else |
67b915a5 | 470 | int fd; |
7ccfb2eb | 471 | const char *tmpdir; |
0badc1ee AJ |
472 | tmpdir = getenv("TMPDIR"); |
473 | if (!tmpdir) | |
474 | tmpdir = "/tmp"; | |
eba25057 JM |
475 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
476 | return -EOVERFLOW; | |
477 | } | |
ea2384d3 | 478 | fd = mkstemp(filename); |
fe235a06 DH |
479 | if (fd < 0) { |
480 | return -errno; | |
481 | } | |
482 | if (close(fd) != 0) { | |
483 | unlink(filename); | |
eba25057 JM |
484 | return -errno; |
485 | } | |
486 | return 0; | |
d5249393 | 487 | #endif |
eba25057 | 488 | } |
fc01f7e7 | 489 | |
84a12e66 CH |
490 | /* |
491 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
492 | * recognized as a host CDROM. | |
493 | */ | |
494 | static BlockDriver *find_hdev_driver(const char *filename) | |
495 | { | |
496 | int score_max = 0, score; | |
497 | BlockDriver *drv = NULL, *d; | |
498 | ||
499 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
500 | if (d->bdrv_probe_device) { | |
501 | score = d->bdrv_probe_device(filename); | |
502 | if (score > score_max) { | |
503 | score_max = score; | |
504 | drv = d; | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | return drv; | |
510 | } | |
511 | ||
98289620 KW |
512 | BlockDriver *bdrv_find_protocol(const char *filename, |
513 | bool allow_protocol_prefix) | |
83f64091 FB |
514 | { |
515 | BlockDriver *drv1; | |
516 | char protocol[128]; | |
1cec71e3 | 517 | int len; |
83f64091 | 518 | const char *p; |
19cb3738 | 519 | |
66f82cee KW |
520 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
521 | ||
39508e7a CH |
522 | /* |
523 | * XXX(hch): we really should not let host device detection | |
524 | * override an explicit protocol specification, but moving this | |
525 | * later breaks access to device names with colons in them. | |
526 | * Thanks to the brain-dead persistent naming schemes on udev- | |
527 | * based Linux systems those actually are quite common. | |
528 | */ | |
529 | drv1 = find_hdev_driver(filename); | |
530 | if (drv1) { | |
531 | return drv1; | |
532 | } | |
533 | ||
98289620 | 534 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 535 | return bdrv_find_format("file"); |
84a12e66 | 536 | } |
98289620 | 537 | |
9e0b22f4 SH |
538 | p = strchr(filename, ':'); |
539 | assert(p != NULL); | |
1cec71e3 AL |
540 | len = p - filename; |
541 | if (len > sizeof(protocol) - 1) | |
542 | len = sizeof(protocol) - 1; | |
543 | memcpy(protocol, filename, len); | |
544 | protocol[len] = '\0'; | |
8a22f02a | 545 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 546 | if (drv1->protocol_name && |
8a22f02a | 547 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 548 | return drv1; |
8a22f02a | 549 | } |
83f64091 FB |
550 | } |
551 | return NULL; | |
552 | } | |
553 | ||
f500a6d3 KW |
554 | static int find_image_format(BlockDriverState *bs, const char *filename, |
555 | BlockDriver **pdrv) | |
f3a5d3f8 | 556 | { |
f500a6d3 | 557 | int score, score_max; |
f3a5d3f8 CH |
558 | BlockDriver *drv1, *drv; |
559 | uint8_t buf[2048]; | |
f500a6d3 | 560 | int ret = 0; |
f8ea0b00 | 561 | |
08a00559 | 562 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 563 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
564 | drv = bdrv_find_format("raw"); |
565 | if (!drv) { | |
566 | ret = -ENOENT; | |
567 | } | |
568 | *pdrv = drv; | |
569 | return ret; | |
1a396859 | 570 | } |
f8ea0b00 | 571 | |
83f64091 | 572 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 573 | if (ret < 0) { |
c98ac35d SW |
574 | *pdrv = NULL; |
575 | return ret; | |
83f64091 FB |
576 | } |
577 | ||
ea2384d3 | 578 | score_max = 0; |
84a12e66 | 579 | drv = NULL; |
8a22f02a | 580 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
581 | if (drv1->bdrv_probe) { |
582 | score = drv1->bdrv_probe(buf, ret, filename); | |
583 | if (score > score_max) { | |
584 | score_max = score; | |
585 | drv = drv1; | |
586 | } | |
0849bf08 | 587 | } |
fc01f7e7 | 588 | } |
c98ac35d SW |
589 | if (!drv) { |
590 | ret = -ENOENT; | |
591 | } | |
592 | *pdrv = drv; | |
593 | return ret; | |
ea2384d3 FB |
594 | } |
595 | ||
51762288 SH |
596 | /** |
597 | * Set the current 'total_sectors' value | |
598 | */ | |
599 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
600 | { | |
601 | BlockDriver *drv = bs->drv; | |
602 | ||
396759ad NB |
603 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
604 | if (bs->sg) | |
605 | return 0; | |
606 | ||
51762288 SH |
607 | /* query actual device if possible, otherwise just trust the hint */ |
608 | if (drv->bdrv_getlength) { | |
609 | int64_t length = drv->bdrv_getlength(bs); | |
610 | if (length < 0) { | |
611 | return length; | |
612 | } | |
613 | hint = length >> BDRV_SECTOR_BITS; | |
614 | } | |
615 | ||
616 | bs->total_sectors = hint; | |
617 | return 0; | |
618 | } | |
619 | ||
9e8f1835 PB |
620 | /** |
621 | * Set open flags for a given discard mode | |
622 | * | |
623 | * Return 0 on success, -1 if the discard mode was invalid. | |
624 | */ | |
625 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
626 | { | |
627 | *flags &= ~BDRV_O_UNMAP; | |
628 | ||
629 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
630 | /* do nothing */ | |
631 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
632 | *flags |= BDRV_O_UNMAP; | |
633 | } else { | |
634 | return -1; | |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
c3993cdc SH |
640 | /** |
641 | * Set open flags for a given cache mode | |
642 | * | |
643 | * Return 0 on success, -1 if the cache mode was invalid. | |
644 | */ | |
645 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
646 | { | |
647 | *flags &= ~BDRV_O_CACHE_MASK; | |
648 | ||
649 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
650 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
651 | } else if (!strcmp(mode, "directsync")) { |
652 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
653 | } else if (!strcmp(mode, "writeback")) { |
654 | *flags |= BDRV_O_CACHE_WB; | |
655 | } else if (!strcmp(mode, "unsafe")) { | |
656 | *flags |= BDRV_O_CACHE_WB; | |
657 | *flags |= BDRV_O_NO_FLUSH; | |
658 | } else if (!strcmp(mode, "writethrough")) { | |
659 | /* this is the default */ | |
660 | } else { | |
661 | return -1; | |
662 | } | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
53fec9d3 SH |
667 | /** |
668 | * The copy-on-read flag is actually a reference count so multiple users may | |
669 | * use the feature without worrying about clobbering its previous state. | |
670 | * Copy-on-read stays enabled until all users have called to disable it. | |
671 | */ | |
672 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
673 | { | |
674 | bs->copy_on_read++; | |
675 | } | |
676 | ||
677 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
678 | { | |
679 | assert(bs->copy_on_read > 0); | |
680 | bs->copy_on_read--; | |
681 | } | |
682 | ||
7b272452 KW |
683 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
684 | { | |
685 | int open_flags = flags | BDRV_O_CACHE_WB; | |
686 | ||
687 | /* | |
688 | * Clear flags that are internal to the block layer before opening the | |
689 | * image. | |
690 | */ | |
691 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
692 | ||
693 | /* | |
694 | * Snapshots should be writable. | |
695 | */ | |
696 | if (bs->is_temporary) { | |
697 | open_flags |= BDRV_O_RDWR; | |
698 | } | |
699 | ||
700 | return open_flags; | |
701 | } | |
702 | ||
57915332 KW |
703 | /* |
704 | * Common part for opening disk images and files | |
b6ad491a KW |
705 | * |
706 | * Removes all processed options from *options. | |
57915332 | 707 | */ |
f500a6d3 | 708 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
035fccdf | 709 | QDict *options, int flags, BlockDriver *drv) |
57915332 KW |
710 | { |
711 | int ret, open_flags; | |
035fccdf | 712 | const char *filename; |
57915332 KW |
713 | |
714 | assert(drv != NULL); | |
6405875c | 715 | assert(bs->file == NULL); |
707ff828 | 716 | assert(options != NULL && bs->options != options); |
57915332 | 717 | |
45673671 KW |
718 | if (file != NULL) { |
719 | filename = file->filename; | |
720 | } else { | |
721 | filename = qdict_get_try_str(options, "filename"); | |
722 | } | |
723 | ||
724 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); | |
28dcee10 | 725 | |
5d186eb0 KW |
726 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
727 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
728 | * and return immediately. */ | |
729 | if (file != NULL && drv->bdrv_file_open) { | |
730 | bdrv_swap(file, bs); | |
731 | return 0; | |
732 | } | |
733 | ||
57915332 | 734 | bs->open_flags = flags; |
57915332 | 735 | bs->buffer_alignment = 512; |
0d51b4de | 736 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
737 | open_flags = bdrv_open_flags(bs, flags); |
738 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
739 | ||
740 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
741 | return -ENOTSUP; | |
742 | } | |
57915332 | 743 | |
53fec9d3 | 744 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
b64ec4e4 | 745 | if (!bs->read_only && (flags & BDRV_O_COPY_ON_READ)) { |
53fec9d3 SH |
746 | bdrv_enable_copy_on_read(bs); |
747 | } | |
748 | ||
c2ad1b0c KW |
749 | if (filename != NULL) { |
750 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
751 | } else { | |
752 | bs->filename[0] = '\0'; | |
753 | } | |
57915332 | 754 | |
57915332 | 755 | bs->drv = drv; |
7267c094 | 756 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 757 | |
03f541bd | 758 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 759 | |
66f82cee KW |
760 | /* Open the image, either directly or using a protocol */ |
761 | if (drv->bdrv_file_open) { | |
5d186eb0 KW |
762 | assert(file == NULL); |
763 | assert(drv->bdrv_parse_filename || filename != NULL); | |
56d1b4d2 | 764 | ret = drv->bdrv_file_open(bs, options, open_flags); |
f500a6d3 | 765 | } else { |
2af5ef70 KW |
766 | if (file == NULL) { |
767 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't use '%s' as a " | |
768 | "block driver for the protocol level", | |
769 | drv->format_name); | |
770 | ret = -EINVAL; | |
771 | goto free_and_fail; | |
772 | } | |
f500a6d3 | 773 | bs->file = file; |
b6ad491a | 774 | ret = drv->bdrv_open(bs, options, open_flags); |
66f82cee KW |
775 | } |
776 | ||
57915332 KW |
777 | if (ret < 0) { |
778 | goto free_and_fail; | |
779 | } | |
780 | ||
51762288 SH |
781 | ret = refresh_total_sectors(bs, bs->total_sectors); |
782 | if (ret < 0) { | |
783 | goto free_and_fail; | |
57915332 | 784 | } |
51762288 | 785 | |
57915332 KW |
786 | #ifndef _WIN32 |
787 | if (bs->is_temporary) { | |
c2ad1b0c | 788 | assert(filename != NULL); |
57915332 KW |
789 | unlink(filename); |
790 | } | |
791 | #endif | |
792 | return 0; | |
793 | ||
794 | free_and_fail: | |
f500a6d3 | 795 | bs->file = NULL; |
7267c094 | 796 | g_free(bs->opaque); |
57915332 KW |
797 | bs->opaque = NULL; |
798 | bs->drv = NULL; | |
799 | return ret; | |
800 | } | |
801 | ||
b6ce07aa KW |
802 | /* |
803 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
804 | * |
805 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
806 | * empty set of options. The reference to the QDict belongs to the block layer | |
807 | * after the call (even on failure), so if the caller intends to reuse the | |
808 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 809 | */ |
787e4a85 KW |
810 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
811 | QDict *options, int flags) | |
ea2384d3 | 812 | { |
83f64091 | 813 | BlockDriverState *bs; |
6db95603 | 814 | BlockDriver *drv; |
c2ad1b0c | 815 | const char *drvname; |
98289620 | 816 | bool allow_protocol_prefix = false; |
83f64091 FB |
817 | int ret; |
818 | ||
707ff828 KW |
819 | /* NULL means an empty set of options */ |
820 | if (options == NULL) { | |
821 | options = qdict_new(); | |
822 | } | |
823 | ||
83f64091 | 824 | bs = bdrv_new(""); |
707ff828 KW |
825 | bs->options = options; |
826 | options = qdict_clone_shallow(options); | |
827 | ||
035fccdf KW |
828 | /* Fetch the file name from the options QDict if necessary */ |
829 | if (!filename) { | |
830 | filename = qdict_get_try_str(options, "filename"); | |
831 | } else if (filename && !qdict_haskey(options, "filename")) { | |
832 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 833 | allow_protocol_prefix = true; |
035fccdf KW |
834 | } else { |
835 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't specify 'file' and " | |
836 | "'filename' options at the same time"); | |
837 | ret = -EINVAL; | |
838 | goto fail; | |
839 | } | |
840 | ||
c2ad1b0c KW |
841 | /* Find the right block driver */ |
842 | drvname = qdict_get_try_str(options, "driver"); | |
843 | if (drvname) { | |
b64ec4e4 | 844 | drv = bdrv_find_whitelisted_format(drvname, !(flags & BDRV_O_RDWR)); |
c2ad1b0c KW |
845 | qdict_del(options, "driver"); |
846 | } else if (filename) { | |
98289620 KW |
847 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
848 | if (!drv) { | |
849 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Unknown protocol"); | |
850 | } | |
c2ad1b0c KW |
851 | } else { |
852 | qerror_report(ERROR_CLASS_GENERIC_ERROR, | |
853 | "Must specify either driver or file"); | |
854 | drv = NULL; | |
855 | } | |
856 | ||
857 | if (!drv) { | |
858 | ret = -ENOENT; | |
859 | goto fail; | |
860 | } | |
861 | ||
862 | /* Parse the filename and open it */ | |
863 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d KW |
864 | Error *local_err = NULL; |
865 | drv->bdrv_parse_filename(filename, options, &local_err); | |
866 | if (error_is_set(&local_err)) { | |
867 | qerror_report_err(local_err); | |
868 | error_free(local_err); | |
869 | ret = -EINVAL; | |
870 | goto fail; | |
871 | } | |
56d1b4d2 | 872 | qdict_del(options, "filename"); |
c2ad1b0c KW |
873 | } else if (!drv->bdrv_parse_filename && !filename) { |
874 | qerror_report(ERROR_CLASS_GENERIC_ERROR, | |
875 | "The '%s' block driver requires a file name", | |
876 | drv->format_name); | |
877 | ret = -EINVAL; | |
878 | goto fail; | |
6963a30d KW |
879 | } |
880 | ||
035fccdf | 881 | ret = bdrv_open_common(bs, NULL, options, flags, drv); |
83f64091 | 882 | if (ret < 0) { |
707ff828 KW |
883 | goto fail; |
884 | } | |
885 | ||
886 | /* Check if any unknown options were used */ | |
887 | if (qdict_size(options) != 0) { | |
888 | const QDictEntry *entry = qdict_first(options); | |
889 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block protocol '%s' doesn't " | |
890 | "support the option '%s'", | |
891 | drv->format_name, entry->key); | |
892 | ret = -EINVAL; | |
893 | goto fail; | |
3b0d4f61 | 894 | } |
707ff828 KW |
895 | QDECREF(options); |
896 | ||
71d0770c | 897 | bs->growable = 1; |
83f64091 FB |
898 | *pbs = bs; |
899 | return 0; | |
707ff828 KW |
900 | |
901 | fail: | |
902 | QDECREF(options); | |
903 | if (!bs->drv) { | |
904 | QDECREF(bs->options); | |
905 | } | |
4f6fd349 | 906 | bdrv_unref(bs); |
707ff828 | 907 | return ret; |
83f64091 FB |
908 | } |
909 | ||
31ca6d07 KW |
910 | /* |
911 | * Opens the backing file for a BlockDriverState if not yet open | |
912 | * | |
913 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
914 | * empty set of options. The reference to the QDict is transferred to this | |
915 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
916 | * it needs to use QINCREF() before calling bdrv_file_open. | |
917 | */ | |
918 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options) | |
9156df12 PB |
919 | { |
920 | char backing_filename[PATH_MAX]; | |
921 | int back_flags, ret; | |
922 | BlockDriver *back_drv = NULL; | |
923 | ||
924 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 925 | QDECREF(options); |
9156df12 PB |
926 | return 0; |
927 | } | |
928 | ||
31ca6d07 KW |
929 | /* NULL means an empty set of options */ |
930 | if (options == NULL) { | |
931 | options = qdict_new(); | |
932 | } | |
933 | ||
9156df12 | 934 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
935 | if (qdict_haskey(options, "file.filename")) { |
936 | backing_filename[0] = '\0'; | |
937 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 938 | QDECREF(options); |
9156df12 PB |
939 | return 0; |
940 | } | |
941 | ||
942 | bs->backing_hd = bdrv_new(""); | |
943 | bdrv_get_full_backing_filename(bs, backing_filename, | |
944 | sizeof(backing_filename)); | |
945 | ||
946 | if (bs->backing_format[0] != '\0') { | |
947 | back_drv = bdrv_find_format(bs->backing_format); | |
948 | } | |
949 | ||
950 | /* backing files always opened read-only */ | |
951 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); | |
952 | ||
31ca6d07 KW |
953 | ret = bdrv_open(bs->backing_hd, |
954 | *backing_filename ? backing_filename : NULL, options, | |
de9c0cec | 955 | back_flags, back_drv); |
9156df12 | 956 | if (ret < 0) { |
4f6fd349 | 957 | bdrv_unref(bs->backing_hd); |
9156df12 PB |
958 | bs->backing_hd = NULL; |
959 | bs->open_flags |= BDRV_O_NO_BACKING; | |
960 | return ret; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | ||
707ff828 KW |
965 | static void extract_subqdict(QDict *src, QDict **dst, const char *start) |
966 | { | |
967 | const QDictEntry *entry, *next; | |
968 | const char *p; | |
969 | ||
970 | *dst = qdict_new(); | |
971 | entry = qdict_first(src); | |
972 | ||
973 | while (entry != NULL) { | |
974 | next = qdict_next(src, entry); | |
975 | if (strstart(entry->key, start, &p)) { | |
976 | qobject_incref(entry->value); | |
977 | qdict_put_obj(*dst, p, entry->value); | |
978 | qdict_del(src, entry->key); | |
979 | } | |
980 | entry = next; | |
981 | } | |
982 | } | |
983 | ||
b6ce07aa KW |
984 | /* |
985 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
986 | * |
987 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
988 | * empty set of options. The reference to the QDict belongs to the block layer | |
989 | * after the call (even on failure), so if the caller intends to reuse the | |
990 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 991 | */ |
de9c0cec KW |
992 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
993 | int flags, BlockDriver *drv) | |
ea2384d3 | 994 | { |
b6ce07aa | 995 | int ret; |
89c9bc3d SW |
996 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
997 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 998 | BlockDriverState *file = NULL; |
707ff828 | 999 | QDict *file_options = NULL; |
74fe54f2 | 1000 | const char *drvname; |
712e7874 | 1001 | |
de9c0cec KW |
1002 | /* NULL means an empty set of options */ |
1003 | if (options == NULL) { | |
1004 | options = qdict_new(); | |
1005 | } | |
1006 | ||
1007 | bs->options = options; | |
b6ad491a | 1008 | options = qdict_clone_shallow(options); |
de9c0cec KW |
1009 | |
1010 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 1011 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
1012 | BlockDriverState *bs1; |
1013 | int64_t total_size; | |
91a073a9 | 1014 | BlockDriver *bdrv_qcow2; |
08b392e1 | 1015 | QEMUOptionParameter *create_options; |
b6ce07aa | 1016 | char backing_filename[PATH_MAX]; |
3b46e624 | 1017 | |
c2ad1b0c KW |
1018 | if (qdict_size(options) != 0) { |
1019 | error_report("Can't use snapshot=on with driver-specific options"); | |
1020 | ret = -EINVAL; | |
1021 | goto fail; | |
1022 | } | |
1023 | assert(filename != NULL); | |
1024 | ||
ea2384d3 FB |
1025 | /* if snapshot, we create a temporary backing file and open it |
1026 | instead of opening 'filename' directly */ | |
33e3963e | 1027 | |
ea2384d3 FB |
1028 | /* if there is a backing file, use it */ |
1029 | bs1 = bdrv_new(""); | |
de9c0cec | 1030 | ret = bdrv_open(bs1, filename, NULL, 0, drv); |
51d7c00c | 1031 | if (ret < 0) { |
4f6fd349 | 1032 | bdrv_unref(bs1); |
de9c0cec | 1033 | goto fail; |
ea2384d3 | 1034 | } |
3e82990b | 1035 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1036 | |
4f6fd349 | 1037 | bdrv_unref(bs1); |
3b46e624 | 1038 | |
eba25057 JM |
1039 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1040 | if (ret < 0) { | |
de9c0cec | 1041 | goto fail; |
eba25057 | 1042 | } |
7c96d46e AL |
1043 | |
1044 | /* Real path is meaningless for protocols */ | |
4d70655b | 1045 | if (path_has_protocol(filename)) { |
7c96d46e AL |
1046 | snprintf(backing_filename, sizeof(backing_filename), |
1047 | "%s", filename); | |
de9c0cec KW |
1048 | } else if (!realpath(filename, backing_filename)) { |
1049 | ret = -errno; | |
1050 | goto fail; | |
1051 | } | |
7c96d46e | 1052 | |
91a073a9 | 1053 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1054 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1055 | NULL); | |
91a073a9 | 1056 | |
08b392e1 KW |
1057 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
1058 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FILE, | |
1059 | backing_filename); | |
91a073a9 | 1060 | if (drv) { |
08b392e1 | 1061 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FMT, |
91a073a9 KW |
1062 | drv->format_name); |
1063 | } | |
1064 | ||
08b392e1 KW |
1065 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options); |
1066 | free_option_parameters(create_options); | |
51d7c00c | 1067 | if (ret < 0) { |
de9c0cec | 1068 | goto fail; |
ea2384d3 | 1069 | } |
91a073a9 | 1070 | |
ea2384d3 | 1071 | filename = tmp_filename; |
91a073a9 | 1072 | drv = bdrv_qcow2; |
ea2384d3 FB |
1073 | bs->is_temporary = 1; |
1074 | } | |
712e7874 | 1075 | |
f500a6d3 KW |
1076 | /* Open image file without format layer */ |
1077 | if (flags & BDRV_O_RDWR) { | |
1078 | flags |= BDRV_O_ALLOW_RDWR; | |
1079 | } | |
1080 | ||
707ff828 KW |
1081 | extract_subqdict(options, &file_options, "file."); |
1082 | ||
1083 | ret = bdrv_file_open(&file, filename, file_options, | |
50b05b6f | 1084 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP)); |
f500a6d3 | 1085 | if (ret < 0) { |
de9c0cec | 1086 | goto fail; |
f500a6d3 KW |
1087 | } |
1088 | ||
b6ce07aa | 1089 | /* Find the right image format driver */ |
74fe54f2 KW |
1090 | drvname = qdict_get_try_str(options, "driver"); |
1091 | if (drvname) { | |
1092 | drv = bdrv_find_whitelisted_format(drvname, !(flags & BDRV_O_RDWR)); | |
1093 | qdict_del(options, "driver"); | |
1094 | } | |
1095 | ||
6db95603 | 1096 | if (!drv) { |
f500a6d3 | 1097 | ret = find_image_format(file, filename, &drv); |
51d7c00c | 1098 | } |
6987307c | 1099 | |
51d7c00c | 1100 | if (!drv) { |
51d7c00c | 1101 | goto unlink_and_fail; |
ea2384d3 | 1102 | } |
b6ce07aa KW |
1103 | |
1104 | /* Open the image */ | |
035fccdf | 1105 | ret = bdrv_open_common(bs, file, options, flags, drv); |
b6ce07aa | 1106 | if (ret < 0) { |
6987307c CH |
1107 | goto unlink_and_fail; |
1108 | } | |
1109 | ||
f500a6d3 | 1110 | if (bs->file != file) { |
4f6fd349 | 1111 | bdrv_unref(file); |
f500a6d3 KW |
1112 | file = NULL; |
1113 | } | |
1114 | ||
b6ce07aa | 1115 | /* If there is a backing file, use it */ |
9156df12 | 1116 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1117 | QDict *backing_options; |
1118 | ||
1119 | extract_subqdict(options, &backing_options, "backing."); | |
1120 | ret = bdrv_open_backing_file(bs, backing_options); | |
b6ce07aa | 1121 | if (ret < 0) { |
b6ad491a | 1122 | goto close_and_fail; |
b6ce07aa | 1123 | } |
b6ce07aa KW |
1124 | } |
1125 | ||
b6ad491a KW |
1126 | /* Check if any unknown options were used */ |
1127 | if (qdict_size(options) != 0) { | |
1128 | const QDictEntry *entry = qdict_first(options); | |
1129 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block format '%s' used by " | |
1130 | "device '%s' doesn't support the option '%s'", | |
1131 | drv->format_name, bs->device_name, entry->key); | |
1132 | ||
1133 | ret = -EINVAL; | |
1134 | goto close_and_fail; | |
1135 | } | |
1136 | QDECREF(options); | |
1137 | ||
b6ce07aa | 1138 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1139 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1140 | } |
1141 | ||
1142 | return 0; | |
1143 | ||
1144 | unlink_and_fail: | |
f500a6d3 | 1145 | if (file != NULL) { |
4f6fd349 | 1146 | bdrv_unref(file); |
f500a6d3 | 1147 | } |
b6ce07aa KW |
1148 | if (bs->is_temporary) { |
1149 | unlink(filename); | |
1150 | } | |
de9c0cec KW |
1151 | fail: |
1152 | QDECREF(bs->options); | |
b6ad491a | 1153 | QDECREF(options); |
de9c0cec | 1154 | bs->options = NULL; |
b6ad491a | 1155 | return ret; |
de9c0cec | 1156 | |
b6ad491a KW |
1157 | close_and_fail: |
1158 | bdrv_close(bs); | |
1159 | QDECREF(options); | |
b6ce07aa KW |
1160 | return ret; |
1161 | } | |
1162 | ||
e971aa12 JC |
1163 | typedef struct BlockReopenQueueEntry { |
1164 | bool prepared; | |
1165 | BDRVReopenState state; | |
1166 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1167 | } BlockReopenQueueEntry; | |
1168 | ||
1169 | /* | |
1170 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1171 | * reopen of multiple devices. | |
1172 | * | |
1173 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1174 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1175 | * be created and initialized. This newly created BlockReopenQueue should be | |
1176 | * passed back in for subsequent calls that are intended to be of the same | |
1177 | * atomic 'set'. | |
1178 | * | |
1179 | * bs is the BlockDriverState to add to the reopen queue. | |
1180 | * | |
1181 | * flags contains the open flags for the associated bs | |
1182 | * | |
1183 | * returns a pointer to bs_queue, which is either the newly allocated | |
1184 | * bs_queue, or the existing bs_queue being used. | |
1185 | * | |
1186 | */ | |
1187 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1188 | BlockDriverState *bs, int flags) | |
1189 | { | |
1190 | assert(bs != NULL); | |
1191 | ||
1192 | BlockReopenQueueEntry *bs_entry; | |
1193 | if (bs_queue == NULL) { | |
1194 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1195 | QSIMPLEQ_INIT(bs_queue); | |
1196 | } | |
1197 | ||
1198 | if (bs->file) { | |
1199 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1200 | } | |
1201 | ||
1202 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1203 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1204 | ||
1205 | bs_entry->state.bs = bs; | |
1206 | bs_entry->state.flags = flags; | |
1207 | ||
1208 | return bs_queue; | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1213 | * | |
1214 | * The queue passed in (bs_queue) must have been built up previous | |
1215 | * via bdrv_reopen_queue(). | |
1216 | * | |
1217 | * Reopens all BDS specified in the queue, with the appropriate | |
1218 | * flags. All devices are prepared for reopen, and failure of any | |
1219 | * device will cause all device changes to be abandonded, and intermediate | |
1220 | * data cleaned up. | |
1221 | * | |
1222 | * If all devices prepare successfully, then the changes are committed | |
1223 | * to all devices. | |
1224 | * | |
1225 | */ | |
1226 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1227 | { | |
1228 | int ret = -1; | |
1229 | BlockReopenQueueEntry *bs_entry, *next; | |
1230 | Error *local_err = NULL; | |
1231 | ||
1232 | assert(bs_queue != NULL); | |
1233 | ||
1234 | bdrv_drain_all(); | |
1235 | ||
1236 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1237 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1238 | error_propagate(errp, local_err); | |
1239 | goto cleanup; | |
1240 | } | |
1241 | bs_entry->prepared = true; | |
1242 | } | |
1243 | ||
1244 | /* If we reach this point, we have success and just need to apply the | |
1245 | * changes | |
1246 | */ | |
1247 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1248 | bdrv_reopen_commit(&bs_entry->state); | |
1249 | } | |
1250 | ||
1251 | ret = 0; | |
1252 | ||
1253 | cleanup: | |
1254 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1255 | if (ret && bs_entry->prepared) { | |
1256 | bdrv_reopen_abort(&bs_entry->state); | |
1257 | } | |
1258 | g_free(bs_entry); | |
1259 | } | |
1260 | g_free(bs_queue); | |
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | ||
1265 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1266 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1267 | { | |
1268 | int ret = -1; | |
1269 | Error *local_err = NULL; | |
1270 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1271 | ||
1272 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1273 | if (local_err != NULL) { | |
1274 | error_propagate(errp, local_err); | |
1275 | } | |
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | ||
1280 | /* | |
1281 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1282 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1283 | * the block driver layer .bdrv_reopen_prepare() | |
1284 | * | |
1285 | * bs is the BlockDriverState to reopen | |
1286 | * flags are the new open flags | |
1287 | * queue is the reopen queue | |
1288 | * | |
1289 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1290 | * as well. | |
1291 | * | |
1292 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1293 | * It is the responsibility of the caller to then call the abort() or | |
1294 | * commit() for any other BDS that have been left in a prepare() state | |
1295 | * | |
1296 | */ | |
1297 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1298 | Error **errp) | |
1299 | { | |
1300 | int ret = -1; | |
1301 | Error *local_err = NULL; | |
1302 | BlockDriver *drv; | |
1303 | ||
1304 | assert(reopen_state != NULL); | |
1305 | assert(reopen_state->bs->drv != NULL); | |
1306 | drv = reopen_state->bs->drv; | |
1307 | ||
1308 | /* if we are to stay read-only, do not allow permission change | |
1309 | * to r/w */ | |
1310 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1311 | reopen_state->flags & BDRV_O_RDWR) { | |
1312 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1313 | reopen_state->bs->device_name); | |
1314 | goto error; | |
1315 | } | |
1316 | ||
1317 | ||
1318 | ret = bdrv_flush(reopen_state->bs); | |
1319 | if (ret) { | |
1320 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1321 | strerror(-ret)); | |
1322 | goto error; | |
1323 | } | |
1324 | ||
1325 | if (drv->bdrv_reopen_prepare) { | |
1326 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1327 | if (ret) { | |
1328 | if (local_err != NULL) { | |
1329 | error_propagate(errp, local_err); | |
1330 | } else { | |
d8b6895f LC |
1331 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1332 | reopen_state->bs->filename); | |
e971aa12 JC |
1333 | } |
1334 | goto error; | |
1335 | } | |
1336 | } else { | |
1337 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1338 | * handler for each supported drv. */ | |
1339 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1340 | drv->format_name, reopen_state->bs->device_name, | |
1341 | "reopening of file"); | |
1342 | ret = -1; | |
1343 | goto error; | |
1344 | } | |
1345 | ||
1346 | ret = 0; | |
1347 | ||
1348 | error: | |
1349 | return ret; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1354 | * makes them final by swapping the staging BlockDriverState contents into | |
1355 | * the active BlockDriverState contents. | |
1356 | */ | |
1357 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1358 | { | |
1359 | BlockDriver *drv; | |
1360 | ||
1361 | assert(reopen_state != NULL); | |
1362 | drv = reopen_state->bs->drv; | |
1363 | assert(drv != NULL); | |
1364 | ||
1365 | /* If there are any driver level actions to take */ | |
1366 | if (drv->bdrv_reopen_commit) { | |
1367 | drv->bdrv_reopen_commit(reopen_state); | |
1368 | } | |
1369 | ||
1370 | /* set BDS specific flags now */ | |
1371 | reopen_state->bs->open_flags = reopen_state->flags; | |
1372 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1373 | BDRV_O_CACHE_WB); | |
1374 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * Abort the reopen, and delete and free the staged changes in | |
1379 | * reopen_state | |
1380 | */ | |
1381 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1382 | { | |
1383 | BlockDriver *drv; | |
1384 | ||
1385 | assert(reopen_state != NULL); | |
1386 | drv = reopen_state->bs->drv; | |
1387 | assert(drv != NULL); | |
1388 | ||
1389 | if (drv->bdrv_reopen_abort) { | |
1390 | drv->bdrv_reopen_abort(reopen_state); | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | ||
fc01f7e7 FB |
1395 | void bdrv_close(BlockDriverState *bs) |
1396 | { | |
3cbc002c PB |
1397 | if (bs->job) { |
1398 | block_job_cancel_sync(bs->job); | |
1399 | } | |
58fda173 SH |
1400 | bdrv_drain_all(); /* complete I/O */ |
1401 | bdrv_flush(bs); | |
1402 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1403 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1404 | |
3cbc002c | 1405 | if (bs->drv) { |
557df6ac | 1406 | if (bs->backing_hd) { |
4f6fd349 | 1407 | bdrv_unref(bs->backing_hd); |
557df6ac SH |
1408 | bs->backing_hd = NULL; |
1409 | } | |
ea2384d3 | 1410 | bs->drv->bdrv_close(bs); |
7267c094 | 1411 | g_free(bs->opaque); |
ea2384d3 FB |
1412 | #ifdef _WIN32 |
1413 | if (bs->is_temporary) { | |
1414 | unlink(bs->filename); | |
1415 | } | |
67b915a5 | 1416 | #endif |
ea2384d3 FB |
1417 | bs->opaque = NULL; |
1418 | bs->drv = NULL; | |
53fec9d3 | 1419 | bs->copy_on_read = 0; |
a275fa42 PB |
1420 | bs->backing_file[0] = '\0'; |
1421 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1422 | bs->total_sectors = 0; |
1423 | bs->encrypted = 0; | |
1424 | bs->valid_key = 0; | |
1425 | bs->sg = 0; | |
1426 | bs->growable = 0; | |
0d51b4de | 1427 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1428 | QDECREF(bs->options); |
1429 | bs->options = NULL; | |
b338082b | 1430 | |
66f82cee | 1431 | if (bs->file != NULL) { |
4f6fd349 | 1432 | bdrv_unref(bs->file); |
0ac9377d | 1433 | bs->file = NULL; |
66f82cee | 1434 | } |
b338082b | 1435 | } |
98f90dba | 1436 | |
9ca11154 PH |
1437 | bdrv_dev_change_media_cb(bs, false); |
1438 | ||
98f90dba ZYW |
1439 | /*throttling disk I/O limits*/ |
1440 | if (bs->io_limits_enabled) { | |
1441 | bdrv_io_limits_disable(bs); | |
1442 | } | |
b338082b FB |
1443 | } |
1444 | ||
2bc93fed MK |
1445 | void bdrv_close_all(void) |
1446 | { | |
1447 | BlockDriverState *bs; | |
1448 | ||
1449 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1450 | bdrv_close(bs); | |
1451 | } | |
1452 | } | |
1453 | ||
88266f5a SH |
1454 | /* Check if any requests are in-flight (including throttled requests) */ |
1455 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1456 | { | |
1457 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1458 | return true; | |
1459 | } | |
cc0681c4 BC |
1460 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1461 | return true; | |
1462 | } | |
1463 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1464 | return true; |
1465 | } | |
1466 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1467 | return true; | |
1468 | } | |
1469 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1470 | return true; | |
1471 | } | |
1472 | return false; | |
1473 | } | |
1474 | ||
1475 | static bool bdrv_requests_pending_all(void) | |
1476 | { | |
1477 | BlockDriverState *bs; | |
1478 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1479 | if (bdrv_requests_pending(bs)) { | |
1480 | return true; | |
1481 | } | |
1482 | } | |
1483 | return false; | |
1484 | } | |
1485 | ||
922453bc SH |
1486 | /* |
1487 | * Wait for pending requests to complete across all BlockDriverStates | |
1488 | * | |
1489 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1490 | * after calling this function. | |
4c355d53 ZYW |
1491 | * |
1492 | * Note that completion of an asynchronous I/O operation can trigger any | |
1493 | * number of other I/O operations on other devices---for example a coroutine | |
1494 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1495 | * coroutine is complete. Because of this, it is not possible to have a | |
1496 | * function to drain a single device's I/O queue. | |
922453bc SH |
1497 | */ |
1498 | void bdrv_drain_all(void) | |
1499 | { | |
88266f5a SH |
1500 | /* Always run first iteration so any pending completion BHs run */ |
1501 | bool busy = true; | |
922453bc SH |
1502 | BlockDriverState *bs; |
1503 | ||
88266f5a | 1504 | while (busy) { |
4c355d53 ZYW |
1505 | /* FIXME: We do not have timer support here, so this is effectively |
1506 | * a busy wait. | |
1507 | */ | |
1508 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
cc0681c4 | 1509 | if (bdrv_start_throttled_reqs(bs)) { |
4c355d53 ZYW |
1510 | busy = true; |
1511 | } | |
1512 | } | |
922453bc | 1513 | |
88266f5a SH |
1514 | busy = bdrv_requests_pending_all(); |
1515 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1516 | } |
1517 | } | |
1518 | ||
d22b2f41 RH |
1519 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1520 | Also, NULL terminate the device_name to prevent double remove */ | |
1521 | void bdrv_make_anon(BlockDriverState *bs) | |
1522 | { | |
1523 | if (bs->device_name[0] != '\0') { | |
1524 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1525 | } | |
1526 | bs->device_name[0] = '\0'; | |
1527 | } | |
1528 | ||
e023b2e2 PB |
1529 | static void bdrv_rebind(BlockDriverState *bs) |
1530 | { | |
1531 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1532 | bs->drv->bdrv_rebind(bs); | |
1533 | } | |
1534 | } | |
1535 | ||
4ddc07ca PB |
1536 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1537 | BlockDriverState *bs_src) | |
8802d1fd | 1538 | { |
4ddc07ca PB |
1539 | /* move some fields that need to stay attached to the device */ |
1540 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1541 | |
1542 | /* dev info */ | |
4ddc07ca PB |
1543 | bs_dest->dev_ops = bs_src->dev_ops; |
1544 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1545 | bs_dest->dev = bs_src->dev; | |
1546 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1547 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1548 | |
4ddc07ca | 1549 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1550 | |
cc0681c4 BC |
1551 | /* i/o throttled req */ |
1552 | memcpy(&bs_dest->throttle_state, | |
1553 | &bs_src->throttle_state, | |
1554 | sizeof(ThrottleState)); | |
1555 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1556 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1557 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1558 | |
8802d1fd | 1559 | /* r/w error */ |
4ddc07ca PB |
1560 | bs_dest->on_read_error = bs_src->on_read_error; |
1561 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1562 | |
1563 | /* i/o status */ | |
4ddc07ca PB |
1564 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1565 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1566 | |
a9fc4408 | 1567 | /* dirty bitmap */ |
4ddc07ca | 1568 | bs_dest->dirty_bitmap = bs_src->dirty_bitmap; |
a9fc4408 | 1569 | |
9fcb0251 FZ |
1570 | /* reference count */ |
1571 | bs_dest->refcnt = bs_src->refcnt; | |
1572 | ||
a9fc4408 | 1573 | /* job */ |
4ddc07ca PB |
1574 | bs_dest->in_use = bs_src->in_use; |
1575 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1576 | |
8802d1fd | 1577 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1578 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1579 | bs_src->device_name); | |
1580 | bs_dest->list = bs_src->list; | |
1581 | } | |
8802d1fd | 1582 | |
4ddc07ca PB |
1583 | /* |
1584 | * Swap bs contents for two image chains while they are live, | |
1585 | * while keeping required fields on the BlockDriverState that is | |
1586 | * actually attached to a device. | |
1587 | * | |
1588 | * This will modify the BlockDriverState fields, and swap contents | |
1589 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1590 | * | |
1591 | * bs_new is required to be anonymous. | |
1592 | * | |
1593 | * This function does not create any image files. | |
1594 | */ | |
1595 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1596 | { | |
1597 | BlockDriverState tmp; | |
f6801b83 | 1598 | |
4ddc07ca PB |
1599 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1600 | assert(bs_new->device_name[0] == '\0'); | |
1601 | assert(bs_new->dirty_bitmap == NULL); | |
1602 | assert(bs_new->job == NULL); | |
1603 | assert(bs_new->dev == NULL); | |
1604 | assert(bs_new->in_use == 0); | |
1605 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1606 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 1607 | |
4ddc07ca PB |
1608 | tmp = *bs_new; |
1609 | *bs_new = *bs_old; | |
1610 | *bs_old = tmp; | |
a9fc4408 | 1611 | |
4ddc07ca PB |
1612 | /* there are some fields that should not be swapped, move them back */ |
1613 | bdrv_move_feature_fields(&tmp, bs_old); | |
1614 | bdrv_move_feature_fields(bs_old, bs_new); | |
1615 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1616 | |
4ddc07ca PB |
1617 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1618 | assert(bs_new->device_name[0] == '\0'); | |
1619 | ||
1620 | /* Check a few fields that should remain attached to the device */ | |
1621 | assert(bs_new->dev == NULL); | |
1622 | assert(bs_new->job == NULL); | |
1623 | assert(bs_new->in_use == 0); | |
1624 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1625 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 PB |
1626 | |
1627 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1628 | bdrv_rebind(bs_old); |
1629 | } | |
1630 | ||
1631 | /* | |
1632 | * Add new bs contents at the top of an image chain while the chain is | |
1633 | * live, while keeping required fields on the top layer. | |
1634 | * | |
1635 | * This will modify the BlockDriverState fields, and swap contents | |
1636 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1637 | * | |
1638 | * bs_new is required to be anonymous. | |
1639 | * | |
1640 | * This function does not create any image files. | |
1641 | */ | |
1642 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1643 | { | |
1644 | bdrv_swap(bs_new, bs_top); | |
1645 | ||
1646 | /* The contents of 'tmp' will become bs_top, as we are | |
1647 | * swapping bs_new and bs_top contents. */ | |
1648 | bs_top->backing_hd = bs_new; | |
1649 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1650 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1651 | bs_new->filename); | |
1652 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1653 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1654 | } |
1655 | ||
4f6fd349 | 1656 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 1657 | { |
fa879d62 | 1658 | assert(!bs->dev); |
3e914655 PB |
1659 | assert(!bs->job); |
1660 | assert(!bs->in_use); | |
4f6fd349 | 1661 | assert(!bs->refcnt); |
18846dee | 1662 | |
e1b5c52e SH |
1663 | bdrv_close(bs); |
1664 | ||
1b7bdbc1 | 1665 | /* remove from list, if necessary */ |
d22b2f41 | 1666 | bdrv_make_anon(bs); |
34c6f050 | 1667 | |
7267c094 | 1668 | g_free(bs); |
fc01f7e7 FB |
1669 | } |
1670 | ||
fa879d62 MA |
1671 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1672 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1673 | { |
fa879d62 | 1674 | if (bs->dev) { |
18846dee MA |
1675 | return -EBUSY; |
1676 | } | |
fa879d62 | 1677 | bs->dev = dev; |
28a7282a | 1678 | bdrv_iostatus_reset(bs); |
18846dee MA |
1679 | return 0; |
1680 | } | |
1681 | ||
fa879d62 MA |
1682 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1683 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1684 | { |
fa879d62 MA |
1685 | if (bdrv_attach_dev(bs, dev) < 0) { |
1686 | abort(); | |
1687 | } | |
1688 | } | |
1689 | ||
1690 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1691 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1692 | { | |
1693 | assert(bs->dev == dev); | |
1694 | bs->dev = NULL; | |
0e49de52 MA |
1695 | bs->dev_ops = NULL; |
1696 | bs->dev_opaque = NULL; | |
29e05f20 | 1697 | bs->buffer_alignment = 512; |
18846dee MA |
1698 | } |
1699 | ||
fa879d62 MA |
1700 | /* TODO change to return DeviceState * when all users are qdevified */ |
1701 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1702 | { |
fa879d62 | 1703 | return bs->dev; |
18846dee MA |
1704 | } |
1705 | ||
0e49de52 MA |
1706 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1707 | void *opaque) | |
1708 | { | |
1709 | bs->dev_ops = ops; | |
1710 | bs->dev_opaque = opaque; | |
1711 | } | |
1712 | ||
32c81a4a PB |
1713 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1714 | enum MonitorEvent ev, | |
1715 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1716 | { |
1717 | QObject *data; | |
1718 | const char *action_str; | |
1719 | ||
1720 | switch (action) { | |
1721 | case BDRV_ACTION_REPORT: | |
1722 | action_str = "report"; | |
1723 | break; | |
1724 | case BDRV_ACTION_IGNORE: | |
1725 | action_str = "ignore"; | |
1726 | break; | |
1727 | case BDRV_ACTION_STOP: | |
1728 | action_str = "stop"; | |
1729 | break; | |
1730 | default: | |
1731 | abort(); | |
1732 | } | |
1733 | ||
1734 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1735 | bdrv->device_name, | |
1736 | action_str, | |
1737 | is_read ? "read" : "write"); | |
32c81a4a | 1738 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1739 | |
1740 | qobject_decref(data); | |
1741 | } | |
1742 | ||
6f382ed2 LC |
1743 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1744 | { | |
1745 | QObject *data; | |
1746 | ||
1747 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1748 | bdrv_get_device_name(bs), ejected); | |
1749 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1750 | ||
1751 | qobject_decref(data); | |
1752 | } | |
1753 | ||
7d4b4ba5 | 1754 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1755 | { |
145feb17 | 1756 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1757 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1758 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1759 | if (tray_was_closed) { |
1760 | /* tray open */ | |
1761 | bdrv_emit_qmp_eject_event(bs, true); | |
1762 | } | |
1763 | if (load) { | |
1764 | /* tray close */ | |
1765 | bdrv_emit_qmp_eject_event(bs, false); | |
1766 | } | |
145feb17 MA |
1767 | } |
1768 | } | |
1769 | ||
2c6942fa MA |
1770 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1771 | { | |
1772 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1773 | } | |
1774 | ||
025ccaa7 PB |
1775 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1776 | { | |
1777 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1778 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1779 | } | |
1780 | } | |
1781 | ||
e4def80b MA |
1782 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1783 | { | |
1784 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1785 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1786 | } | |
1787 | return false; | |
1788 | } | |
1789 | ||
145feb17 MA |
1790 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1791 | { | |
1792 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1793 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1794 | } |
1795 | } | |
1796 | ||
f107639a MA |
1797 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1798 | { | |
1799 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1800 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1801 | } | |
1802 | return false; | |
1803 | } | |
1804 | ||
e97fc193 AL |
1805 | /* |
1806 | * Run consistency checks on an image | |
1807 | * | |
e076f338 | 1808 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1809 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1810 | * check are stored in res. |
e97fc193 | 1811 | */ |
4534ff54 | 1812 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1813 | { |
1814 | if (bs->drv->bdrv_check == NULL) { | |
1815 | return -ENOTSUP; | |
1816 | } | |
1817 | ||
e076f338 | 1818 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1819 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1820 | } |
1821 | ||
8a426614 KW |
1822 | #define COMMIT_BUF_SECTORS 2048 |
1823 | ||
33e3963e FB |
1824 | /* commit COW file into the raw image */ |
1825 | int bdrv_commit(BlockDriverState *bs) | |
1826 | { | |
19cb3738 | 1827 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1828 | int64_t sector, total_sectors; |
1829 | int n, ro, open_flags; | |
0bce597d | 1830 | int ret = 0; |
8a426614 | 1831 | uint8_t *buf; |
c2cba3d9 | 1832 | char filename[PATH_MAX]; |
33e3963e | 1833 | |
19cb3738 FB |
1834 | if (!drv) |
1835 | return -ENOMEDIUM; | |
4dca4b63 NS |
1836 | |
1837 | if (!bs->backing_hd) { | |
1838 | return -ENOTSUP; | |
33e3963e FB |
1839 | } |
1840 | ||
2d3735d3 SH |
1841 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1842 | return -EBUSY; | |
1843 | } | |
1844 | ||
4dca4b63 | 1845 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
1846 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
1847 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
1848 | open_flags = bs->backing_hd->open_flags; |
1849 | ||
1850 | if (ro) { | |
0bce597d JC |
1851 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
1852 | return -EACCES; | |
4dca4b63 | 1853 | } |
ea2384d3 | 1854 | } |
33e3963e | 1855 | |
6ea44308 | 1856 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1857 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1858 | |
1859 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1860 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1861 | |
1862 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1863 | ret = -EIO; | |
1864 | goto ro_cleanup; | |
1865 | } | |
1866 | ||
1867 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1868 | ret = -EIO; | |
1869 | goto ro_cleanup; | |
1870 | } | |
ea2384d3 | 1871 | } |
33e3963e | 1872 | } |
95389c86 | 1873 | |
1d44952f CH |
1874 | if (drv->bdrv_make_empty) { |
1875 | ret = drv->bdrv_make_empty(bs); | |
1876 | bdrv_flush(bs); | |
1877 | } | |
95389c86 | 1878 | |
3f5075ae CH |
1879 | /* |
1880 | * Make sure all data we wrote to the backing device is actually | |
1881 | * stable on disk. | |
1882 | */ | |
1883 | if (bs->backing_hd) | |
1884 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1885 | |
1886 | ro_cleanup: | |
7267c094 | 1887 | g_free(buf); |
4dca4b63 NS |
1888 | |
1889 | if (ro) { | |
0bce597d JC |
1890 | /* ignoring error return here */ |
1891 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
1892 | } |
1893 | ||
1d44952f | 1894 | return ret; |
33e3963e FB |
1895 | } |
1896 | ||
e8877497 | 1897 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1898 | { |
1899 | BlockDriverState *bs; | |
1900 | ||
1901 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
272d2d8e JC |
1902 | if (bs->drv && bs->backing_hd) { |
1903 | int ret = bdrv_commit(bs); | |
1904 | if (ret < 0) { | |
1905 | return ret; | |
1906 | } | |
e8877497 | 1907 | } |
6ab4b5ab | 1908 | } |
e8877497 | 1909 | return 0; |
6ab4b5ab MA |
1910 | } |
1911 | ||
dbffbdcf SH |
1912 | /** |
1913 | * Remove an active request from the tracked requests list | |
1914 | * | |
1915 | * This function should be called when a tracked request is completing. | |
1916 | */ | |
1917 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1918 | { | |
1919 | QLIST_REMOVE(req, list); | |
f4658285 | 1920 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1921 | } |
1922 | ||
1923 | /** | |
1924 | * Add an active request to the tracked requests list | |
1925 | */ | |
1926 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1927 | BlockDriverState *bs, | |
1928 | int64_t sector_num, | |
1929 | int nb_sectors, bool is_write) | |
1930 | { | |
1931 | *req = (BdrvTrackedRequest){ | |
1932 | .bs = bs, | |
1933 | .sector_num = sector_num, | |
1934 | .nb_sectors = nb_sectors, | |
1935 | .is_write = is_write, | |
5f8b6491 | 1936 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1937 | }; |
1938 | ||
f4658285 SH |
1939 | qemu_co_queue_init(&req->wait_queue); |
1940 | ||
dbffbdcf SH |
1941 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1942 | } | |
1943 | ||
d83947ac SH |
1944 | /** |
1945 | * Round a region to cluster boundaries | |
1946 | */ | |
343bded4 PB |
1947 | void bdrv_round_to_clusters(BlockDriverState *bs, |
1948 | int64_t sector_num, int nb_sectors, | |
1949 | int64_t *cluster_sector_num, | |
1950 | int *cluster_nb_sectors) | |
d83947ac SH |
1951 | { |
1952 | BlockDriverInfo bdi; | |
1953 | ||
1954 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1955 | *cluster_sector_num = sector_num; | |
1956 | *cluster_nb_sectors = nb_sectors; | |
1957 | } else { | |
1958 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1959 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1960 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1961 | nb_sectors, c); | |
1962 | } | |
1963 | } | |
1964 | ||
f4658285 SH |
1965 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1966 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1967 | /* aaaa bbbb */ |
1968 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1969 | return false; | |
1970 | } | |
1971 | /* bbbb aaaa */ | |
1972 | if (req->sector_num >= sector_num + nb_sectors) { | |
1973 | return false; | |
1974 | } | |
1975 | return true; | |
f4658285 SH |
1976 | } |
1977 | ||
1978 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1979 | int64_t sector_num, int nb_sectors) | |
1980 | { | |
1981 | BdrvTrackedRequest *req; | |
d83947ac SH |
1982 | int64_t cluster_sector_num; |
1983 | int cluster_nb_sectors; | |
f4658285 SH |
1984 | bool retry; |
1985 | ||
d83947ac SH |
1986 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1987 | * that allocating writes will be serialized and not race with each other | |
1988 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1989 | * CoR read and write operations are atomic and guest writes cannot | |
1990 | * interleave between them. | |
1991 | */ | |
343bded4 PB |
1992 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
1993 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 1994 | |
f4658285 SH |
1995 | do { |
1996 | retry = false; | |
1997 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1998 | if (tracked_request_overlaps(req, cluster_sector_num, |
1999 | cluster_nb_sectors)) { | |
5f8b6491 SH |
2000 | /* Hitting this means there was a reentrant request, for |
2001 | * example, a block driver issuing nested requests. This must | |
2002 | * never happen since it means deadlock. | |
2003 | */ | |
2004 | assert(qemu_coroutine_self() != req->co); | |
2005 | ||
f4658285 SH |
2006 | qemu_co_queue_wait(&req->wait_queue); |
2007 | retry = true; | |
2008 | break; | |
2009 | } | |
2010 | } | |
2011 | } while (retry); | |
2012 | } | |
2013 | ||
756e6736 KW |
2014 | /* |
2015 | * Return values: | |
2016 | * 0 - success | |
2017 | * -EINVAL - backing format specified, but no file | |
2018 | * -ENOSPC - can't update the backing file because no space is left in the | |
2019 | * image file header | |
2020 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2021 | */ | |
2022 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2023 | const char *backing_file, const char *backing_fmt) | |
2024 | { | |
2025 | BlockDriver *drv = bs->drv; | |
469ef350 | 2026 | int ret; |
756e6736 | 2027 | |
5f377794 PB |
2028 | /* Backing file format doesn't make sense without a backing file */ |
2029 | if (backing_fmt && !backing_file) { | |
2030 | return -EINVAL; | |
2031 | } | |
2032 | ||
756e6736 | 2033 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2034 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2035 | } else { |
469ef350 | 2036 | ret = -ENOTSUP; |
756e6736 | 2037 | } |
469ef350 PB |
2038 | |
2039 | if (ret == 0) { | |
2040 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2041 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2042 | } | |
2043 | return ret; | |
756e6736 KW |
2044 | } |
2045 | ||
6ebdcee2 JC |
2046 | /* |
2047 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2048 | * | |
2049 | * active is the current topmost image. | |
2050 | * | |
2051 | * Returns NULL if bs is not found in active's image chain, | |
2052 | * or if active == bs. | |
2053 | */ | |
2054 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2055 | BlockDriverState *bs) | |
2056 | { | |
2057 | BlockDriverState *overlay = NULL; | |
2058 | BlockDriverState *intermediate; | |
2059 | ||
2060 | assert(active != NULL); | |
2061 | assert(bs != NULL); | |
2062 | ||
2063 | /* if bs is the same as active, then by definition it has no overlay | |
2064 | */ | |
2065 | if (active == bs) { | |
2066 | return NULL; | |
2067 | } | |
2068 | ||
2069 | intermediate = active; | |
2070 | while (intermediate->backing_hd) { | |
2071 | if (intermediate->backing_hd == bs) { | |
2072 | overlay = intermediate; | |
2073 | break; | |
2074 | } | |
2075 | intermediate = intermediate->backing_hd; | |
2076 | } | |
2077 | ||
2078 | return overlay; | |
2079 | } | |
2080 | ||
2081 | typedef struct BlkIntermediateStates { | |
2082 | BlockDriverState *bs; | |
2083 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2084 | } BlkIntermediateStates; | |
2085 | ||
2086 | ||
2087 | /* | |
2088 | * Drops images above 'base' up to and including 'top', and sets the image | |
2089 | * above 'top' to have base as its backing file. | |
2090 | * | |
2091 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2092 | * information in 'bs' can be properly updated. | |
2093 | * | |
2094 | * E.g., this will convert the following chain: | |
2095 | * bottom <- base <- intermediate <- top <- active | |
2096 | * | |
2097 | * to | |
2098 | * | |
2099 | * bottom <- base <- active | |
2100 | * | |
2101 | * It is allowed for bottom==base, in which case it converts: | |
2102 | * | |
2103 | * base <- intermediate <- top <- active | |
2104 | * | |
2105 | * to | |
2106 | * | |
2107 | * base <- active | |
2108 | * | |
2109 | * Error conditions: | |
2110 | * if active == top, that is considered an error | |
2111 | * | |
2112 | */ | |
2113 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2114 | BlockDriverState *base) | |
2115 | { | |
2116 | BlockDriverState *intermediate; | |
2117 | BlockDriverState *base_bs = NULL; | |
2118 | BlockDriverState *new_top_bs = NULL; | |
2119 | BlkIntermediateStates *intermediate_state, *next; | |
2120 | int ret = -EIO; | |
2121 | ||
2122 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2123 | QSIMPLEQ_INIT(&states_to_delete); | |
2124 | ||
2125 | if (!top->drv || !base->drv) { | |
2126 | goto exit; | |
2127 | } | |
2128 | ||
2129 | new_top_bs = bdrv_find_overlay(active, top); | |
2130 | ||
2131 | if (new_top_bs == NULL) { | |
2132 | /* we could not find the image above 'top', this is an error */ | |
2133 | goto exit; | |
2134 | } | |
2135 | ||
2136 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2137 | * to do, no intermediate images */ | |
2138 | if (new_top_bs->backing_hd == base) { | |
2139 | ret = 0; | |
2140 | goto exit; | |
2141 | } | |
2142 | ||
2143 | intermediate = top; | |
2144 | ||
2145 | /* now we will go down through the list, and add each BDS we find | |
2146 | * into our deletion queue, until we hit the 'base' | |
2147 | */ | |
2148 | while (intermediate) { | |
2149 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2150 | intermediate_state->bs = intermediate; | |
2151 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2152 | ||
2153 | if (intermediate->backing_hd == base) { | |
2154 | base_bs = intermediate->backing_hd; | |
2155 | break; | |
2156 | } | |
2157 | intermediate = intermediate->backing_hd; | |
2158 | } | |
2159 | if (base_bs == NULL) { | |
2160 | /* something went wrong, we did not end at the base. safely | |
2161 | * unravel everything, and exit with error */ | |
2162 | goto exit; | |
2163 | } | |
2164 | ||
2165 | /* success - we can delete the intermediate states, and link top->base */ | |
2166 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2167 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2168 | if (ret) { | |
2169 | goto exit; | |
2170 | } | |
2171 | new_top_bs->backing_hd = base_bs; | |
2172 | ||
2173 | ||
2174 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2175 | /* so that bdrv_close() does not recursively close the chain */ | |
2176 | intermediate_state->bs->backing_hd = NULL; | |
4f6fd349 | 2177 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2178 | } |
2179 | ret = 0; | |
2180 | ||
2181 | exit: | |
2182 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2183 | g_free(intermediate_state); | |
2184 | } | |
2185 | return ret; | |
2186 | } | |
2187 | ||
2188 | ||
71d0770c AL |
2189 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2190 | size_t size) | |
2191 | { | |
2192 | int64_t len; | |
2193 | ||
2194 | if (!bdrv_is_inserted(bs)) | |
2195 | return -ENOMEDIUM; | |
2196 | ||
2197 | if (bs->growable) | |
2198 | return 0; | |
2199 | ||
2200 | len = bdrv_getlength(bs); | |
2201 | ||
fbb7b4e0 KW |
2202 | if (offset < 0) |
2203 | return -EIO; | |
2204 | ||
2205 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2206 | return -EIO; |
2207 | ||
2208 | return 0; | |
2209 | } | |
2210 | ||
2211 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2212 | int nb_sectors) | |
2213 | { | |
eb5a3165 JS |
2214 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2215 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2216 | } |
2217 | ||
1c9805a3 SH |
2218 | typedef struct RwCo { |
2219 | BlockDriverState *bs; | |
2220 | int64_t sector_num; | |
2221 | int nb_sectors; | |
2222 | QEMUIOVector *qiov; | |
2223 | bool is_write; | |
2224 | int ret; | |
4105eaaa | 2225 | BdrvRequestFlags flags; |
1c9805a3 SH |
2226 | } RwCo; |
2227 | ||
2228 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2229 | { |
1c9805a3 | 2230 | RwCo *rwco = opaque; |
ea2384d3 | 2231 | |
1c9805a3 SH |
2232 | if (!rwco->is_write) { |
2233 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2234 | rwco->nb_sectors, rwco->qiov, |
2235 | rwco->flags); | |
1c9805a3 SH |
2236 | } else { |
2237 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2238 | rwco->nb_sectors, rwco->qiov, |
2239 | rwco->flags); | |
1c9805a3 SH |
2240 | } |
2241 | } | |
e7a8a783 | 2242 | |
1c9805a3 | 2243 | /* |
8d3b1a2d | 2244 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2245 | */ |
8d3b1a2d | 2246 | static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num, |
4105eaaa PL |
2247 | QEMUIOVector *qiov, bool is_write, |
2248 | BdrvRequestFlags flags) | |
1c9805a3 | 2249 | { |
1c9805a3 SH |
2250 | Coroutine *co; |
2251 | RwCo rwco = { | |
2252 | .bs = bs, | |
2253 | .sector_num = sector_num, | |
8d3b1a2d KW |
2254 | .nb_sectors = qiov->size >> BDRV_SECTOR_BITS, |
2255 | .qiov = qiov, | |
1c9805a3 SH |
2256 | .is_write = is_write, |
2257 | .ret = NOT_DONE, | |
4105eaaa | 2258 | .flags = flags, |
1c9805a3 | 2259 | }; |
8d3b1a2d | 2260 | assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0); |
e7a8a783 | 2261 | |
498e386c ZYW |
2262 | /** |
2263 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2264 | * will not fire; so the I/O throttling function has to be disabled here | |
2265 | * if it has been enabled. | |
2266 | */ | |
2267 | if (bs->io_limits_enabled) { | |
2268 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2269 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2270 | bdrv_io_limits_disable(bs); | |
2271 | } | |
2272 | ||
1c9805a3 SH |
2273 | if (qemu_in_coroutine()) { |
2274 | /* Fast-path if already in coroutine context */ | |
2275 | bdrv_rw_co_entry(&rwco); | |
2276 | } else { | |
2277 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2278 | qemu_coroutine_enter(co, &rwco); | |
2279 | while (rwco.ret == NOT_DONE) { | |
2280 | qemu_aio_wait(); | |
2281 | } | |
2282 | } | |
2283 | return rwco.ret; | |
2284 | } | |
b338082b | 2285 | |
8d3b1a2d KW |
2286 | /* |
2287 | * Process a synchronous request using coroutines | |
2288 | */ | |
2289 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2290 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2291 | { |
2292 | QEMUIOVector qiov; | |
2293 | struct iovec iov = { | |
2294 | .iov_base = (void *)buf, | |
2295 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2296 | }; | |
2297 | ||
2298 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4105eaaa | 2299 | return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags); |
8d3b1a2d KW |
2300 | } |
2301 | ||
1c9805a3 SH |
2302 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2303 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2304 | uint8_t *buf, int nb_sectors) | |
2305 | { | |
4105eaaa | 2306 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2307 | } |
2308 | ||
07d27a44 MA |
2309 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2310 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2311 | uint8_t *buf, int nb_sectors) | |
2312 | { | |
2313 | bool enabled; | |
2314 | int ret; | |
2315 | ||
2316 | enabled = bs->io_limits_enabled; | |
2317 | bs->io_limits_enabled = false; | |
4e7395e8 | 2318 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2319 | bs->io_limits_enabled = enabled; |
2320 | return ret; | |
2321 | } | |
2322 | ||
5fafdf24 | 2323 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2324 | -EIO generic I/O error (may happen for all errors) |
2325 | -ENOMEDIUM No media inserted. | |
2326 | -EINVAL Invalid sector number or nb_sectors | |
2327 | -EACCES Trying to write a read-only device | |
2328 | */ | |
5fafdf24 | 2329 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2330 | const uint8_t *buf, int nb_sectors) |
2331 | { | |
4105eaaa | 2332 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2333 | } |
2334 | ||
8d3b1a2d KW |
2335 | int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov) |
2336 | { | |
4105eaaa PL |
2337 | return bdrv_rwv_co(bs, sector_num, qiov, true, 0); |
2338 | } | |
2339 | ||
2340 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
2341 | { | |
2342 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
2343 | BDRV_REQ_ZERO_WRITE); | |
8d3b1a2d KW |
2344 | } |
2345 | ||
eda578e5 AL |
2346 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2347 | void *buf, int count1) | |
83f64091 | 2348 | { |
6ea44308 | 2349 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2350 | int len, nb_sectors, count; |
2351 | int64_t sector_num; | |
9a8c4cce | 2352 | int ret; |
83f64091 FB |
2353 | |
2354 | count = count1; | |
2355 | /* first read to align to sector start */ | |
6ea44308 | 2356 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2357 | if (len > count) |
2358 | len = count; | |
6ea44308 | 2359 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2360 | if (len > 0) { |
9a8c4cce KW |
2361 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2362 | return ret; | |
6ea44308 | 2363 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2364 | count -= len; |
2365 | if (count == 0) | |
2366 | return count1; | |
2367 | sector_num++; | |
2368 | buf += len; | |
2369 | } | |
2370 | ||
2371 | /* read the sectors "in place" */ | |
6ea44308 | 2372 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2373 | if (nb_sectors > 0) { |
9a8c4cce KW |
2374 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2375 | return ret; | |
83f64091 | 2376 | sector_num += nb_sectors; |
6ea44308 | 2377 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2378 | buf += len; |
2379 | count -= len; | |
2380 | } | |
2381 | ||
2382 | /* add data from the last sector */ | |
2383 | if (count > 0) { | |
9a8c4cce KW |
2384 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2385 | return ret; | |
83f64091 FB |
2386 | memcpy(buf, tmp_buf, count); |
2387 | } | |
2388 | return count1; | |
2389 | } | |
2390 | ||
8d3b1a2d | 2391 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2392 | { |
6ea44308 | 2393 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2394 | int len, nb_sectors, count; |
2395 | int64_t sector_num; | |
9a8c4cce | 2396 | int ret; |
83f64091 | 2397 | |
8d3b1a2d KW |
2398 | count = qiov->size; |
2399 | ||
83f64091 | 2400 | /* first write to align to sector start */ |
6ea44308 | 2401 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2402 | if (len > count) |
2403 | len = count; | |
6ea44308 | 2404 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2405 | if (len > 0) { |
9a8c4cce KW |
2406 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2407 | return ret; | |
8d3b1a2d KW |
2408 | qemu_iovec_to_buf(qiov, 0, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), |
2409 | len); | |
9a8c4cce KW |
2410 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2411 | return ret; | |
83f64091 FB |
2412 | count -= len; |
2413 | if (count == 0) | |
8d3b1a2d | 2414 | return qiov->size; |
83f64091 | 2415 | sector_num++; |
83f64091 FB |
2416 | } |
2417 | ||
2418 | /* write the sectors "in place" */ | |
6ea44308 | 2419 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2420 | if (nb_sectors > 0) { |
8d3b1a2d KW |
2421 | QEMUIOVector qiov_inplace; |
2422 | ||
2423 | qemu_iovec_init(&qiov_inplace, qiov->niov); | |
2424 | qemu_iovec_concat(&qiov_inplace, qiov, len, | |
2425 | nb_sectors << BDRV_SECTOR_BITS); | |
2426 | ret = bdrv_writev(bs, sector_num, &qiov_inplace); | |
2427 | qemu_iovec_destroy(&qiov_inplace); | |
2428 | if (ret < 0) { | |
9a8c4cce | 2429 | return ret; |
8d3b1a2d KW |
2430 | } |
2431 | ||
83f64091 | 2432 | sector_num += nb_sectors; |
6ea44308 | 2433 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2434 | count -= len; |
2435 | } | |
2436 | ||
2437 | /* add data from the last sector */ | |
2438 | if (count > 0) { | |
9a8c4cce KW |
2439 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2440 | return ret; | |
8d3b1a2d | 2441 | qemu_iovec_to_buf(qiov, qiov->size - count, tmp_buf, count); |
9a8c4cce KW |
2442 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2443 | return ret; | |
83f64091 | 2444 | } |
8d3b1a2d KW |
2445 | return qiov->size; |
2446 | } | |
2447 | ||
2448 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
2449 | const void *buf, int count1) | |
2450 | { | |
2451 | QEMUIOVector qiov; | |
2452 | struct iovec iov = { | |
2453 | .iov_base = (void *) buf, | |
2454 | .iov_len = count1, | |
2455 | }; | |
2456 | ||
2457 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2458 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2459 | } |
83f64091 | 2460 | |
f08145fe KW |
2461 | /* |
2462 | * Writes to the file and ensures that no writes are reordered across this | |
2463 | * request (acts as a barrier) | |
2464 | * | |
2465 | * Returns 0 on success, -errno in error cases. | |
2466 | */ | |
2467 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2468 | const void *buf, int count) | |
2469 | { | |
2470 | int ret; | |
2471 | ||
2472 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2473 | if (ret < 0) { | |
2474 | return ret; | |
2475 | } | |
2476 | ||
f05fa4ad PB |
2477 | /* No flush needed for cache modes that already do it */ |
2478 | if (bs->enable_write_cache) { | |
f08145fe KW |
2479 | bdrv_flush(bs); |
2480 | } | |
2481 | ||
2482 | return 0; | |
2483 | } | |
2484 | ||
470c0504 | 2485 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2486 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2487 | { | |
2488 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2489 | * their read buffer while the operation is in progress do not end up | |
2490 | * modifying the image file. This is critical for zero-copy guest I/O | |
2491 | * where anything might happen inside guest memory. | |
2492 | */ | |
2493 | void *bounce_buffer; | |
2494 | ||
79c053bd | 2495 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2496 | struct iovec iov; |
2497 | QEMUIOVector bounce_qiov; | |
2498 | int64_t cluster_sector_num; | |
2499 | int cluster_nb_sectors; | |
2500 | size_t skip_bytes; | |
2501 | int ret; | |
2502 | ||
2503 | /* Cover entire cluster so no additional backing file I/O is required when | |
2504 | * allocating cluster in the image file. | |
2505 | */ | |
343bded4 PB |
2506 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2507 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2508 | |
470c0504 SH |
2509 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2510 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2511 | |
2512 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2513 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2514 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2515 | ||
79c053bd SH |
2516 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2517 | &bounce_qiov); | |
ab185921 SH |
2518 | if (ret < 0) { |
2519 | goto err; | |
2520 | } | |
2521 | ||
79c053bd SH |
2522 | if (drv->bdrv_co_write_zeroes && |
2523 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
2524 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
2525 | cluster_nb_sectors); | |
79c053bd | 2526 | } else { |
f05fa4ad PB |
2527 | /* This does not change the data on the disk, it is not necessary |
2528 | * to flush even in cache=writethrough mode. | |
2529 | */ | |
79c053bd | 2530 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2531 | &bounce_qiov); |
79c053bd SH |
2532 | } |
2533 | ||
ab185921 SH |
2534 | if (ret < 0) { |
2535 | /* It might be okay to ignore write errors for guest requests. If this | |
2536 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2537 | * Simply report it in all cases. | |
2538 | */ | |
2539 | goto err; | |
2540 | } | |
2541 | ||
2542 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2543 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2544 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2545 | |
2546 | err: | |
2547 | qemu_vfree(bounce_buffer); | |
2548 | return ret; | |
2549 | } | |
2550 | ||
c5fbe571 SH |
2551 | /* |
2552 | * Handle a read request in coroutine context | |
2553 | */ | |
2554 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2555 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2556 | BdrvRequestFlags flags) | |
da1fa91d KW |
2557 | { |
2558 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2559 | BdrvTrackedRequest req; |
2560 | int ret; | |
da1fa91d | 2561 | |
da1fa91d KW |
2562 | if (!drv) { |
2563 | return -ENOMEDIUM; | |
2564 | } | |
2565 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2566 | return -EIO; | |
2567 | } | |
2568 | ||
f4658285 | 2569 | if (bs->copy_on_read) { |
470c0504 SH |
2570 | flags |= BDRV_REQ_COPY_ON_READ; |
2571 | } | |
2572 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2573 | bs->copy_on_read_in_flight++; | |
2574 | } | |
2575 | ||
2576 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2577 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2578 | } | |
2579 | ||
cc0681c4 BC |
2580 | /* throttling disk I/O */ |
2581 | if (bs->io_limits_enabled) { | |
2582 | bdrv_io_limits_intercept(bs, nb_sectors, false); | |
2583 | } | |
2584 | ||
dbffbdcf | 2585 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2586 | |
470c0504 | 2587 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2588 | int pnum; |
2589 | ||
bdad13b9 | 2590 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
2591 | if (ret < 0) { |
2592 | goto out; | |
2593 | } | |
2594 | ||
2595 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2596 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2597 | goto out; |
2598 | } | |
2599 | } | |
2600 | ||
893a8f62 MK |
2601 | if (!(bs->zero_beyond_eof && bs->growable)) { |
2602 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
2603 | } else { | |
2604 | /* Read zeros after EOF of growable BDSes */ | |
2605 | int64_t len, total_sectors, max_nb_sectors; | |
2606 | ||
2607 | len = bdrv_getlength(bs); | |
2608 | if (len < 0) { | |
2609 | ret = len; | |
2610 | goto out; | |
2611 | } | |
2612 | ||
2613 | total_sectors = len >> BDRV_SECTOR_BITS; | |
2614 | max_nb_sectors = MAX(0, total_sectors - sector_num); | |
2615 | if (max_nb_sectors > 0) { | |
2616 | ret = drv->bdrv_co_readv(bs, sector_num, | |
2617 | MIN(nb_sectors, max_nb_sectors), qiov); | |
2618 | } else { | |
2619 | ret = 0; | |
2620 | } | |
2621 | ||
2622 | /* Reading beyond end of file is supposed to produce zeroes */ | |
2623 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
2624 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
2625 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
2626 | BDRV_SECTOR_SIZE; | |
2627 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
2628 | } | |
2629 | } | |
ab185921 SH |
2630 | |
2631 | out: | |
dbffbdcf | 2632 | tracked_request_end(&req); |
470c0504 SH |
2633 | |
2634 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2635 | bs->copy_on_read_in_flight--; | |
2636 | } | |
2637 | ||
dbffbdcf | 2638 | return ret; |
da1fa91d KW |
2639 | } |
2640 | ||
c5fbe571 | 2641 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2642 | int nb_sectors, QEMUIOVector *qiov) |
2643 | { | |
c5fbe571 | 2644 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2645 | |
470c0504 SH |
2646 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2647 | } | |
2648 | ||
2649 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2650 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2651 | { | |
2652 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2653 | ||
2654 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2655 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2656 | } |
2657 | ||
f08f2dda SH |
2658 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
2659 | int64_t sector_num, int nb_sectors) | |
2660 | { | |
2661 | BlockDriver *drv = bs->drv; | |
2662 | QEMUIOVector qiov; | |
2663 | struct iovec iov; | |
2664 | int ret; | |
2665 | ||
621f0589 KW |
2666 | /* TODO Emulate only part of misaligned requests instead of letting block |
2667 | * drivers return -ENOTSUP and emulate everything */ | |
2668 | ||
f08f2dda SH |
2669 | /* First try the efficient write zeroes operation */ |
2670 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
2671 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
2672 | if (ret != -ENOTSUP) { | |
2673 | return ret; | |
2674 | } | |
f08f2dda SH |
2675 | } |
2676 | ||
2677 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2678 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2679 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
2680 | memset(iov.iov_base, 0, iov.iov_len); | |
2681 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2682 | ||
2683 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
2684 | ||
2685 | qemu_vfree(iov.iov_base); | |
2686 | return ret; | |
2687 | } | |
2688 | ||
c5fbe571 SH |
2689 | /* |
2690 | * Handle a write request in coroutine context | |
2691 | */ | |
2692 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2693 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2694 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2695 | { |
2696 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2697 | BdrvTrackedRequest req; |
6b7cb247 | 2698 | int ret; |
da1fa91d KW |
2699 | |
2700 | if (!bs->drv) { | |
2701 | return -ENOMEDIUM; | |
2702 | } | |
2703 | if (bs->read_only) { | |
2704 | return -EACCES; | |
2705 | } | |
2706 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2707 | return -EIO; | |
2708 | } | |
2709 | ||
470c0504 | 2710 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2711 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2712 | } | |
2713 | ||
cc0681c4 BC |
2714 | /* throttling disk I/O */ |
2715 | if (bs->io_limits_enabled) { | |
2716 | bdrv_io_limits_intercept(bs, nb_sectors, true); | |
2717 | } | |
2718 | ||
dbffbdcf SH |
2719 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2720 | ||
d616b224 SH |
2721 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req); |
2722 | ||
2723 | if (ret < 0) { | |
2724 | /* Do nothing, write notifier decided to fail this request */ | |
2725 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
f08f2dda SH |
2726 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); |
2727 | } else { | |
2728 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2729 | } | |
6b7cb247 | 2730 | |
f05fa4ad PB |
2731 | if (ret == 0 && !bs->enable_write_cache) { |
2732 | ret = bdrv_co_flush(bs); | |
2733 | } | |
2734 | ||
da1fa91d | 2735 | if (bs->dirty_bitmap) { |
1755da16 | 2736 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2737 | } |
2738 | ||
2739 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2740 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2741 | } | |
df2a6f29 PB |
2742 | if (bs->growable && ret >= 0) { |
2743 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
2744 | } | |
da1fa91d | 2745 | |
dbffbdcf SH |
2746 | tracked_request_end(&req); |
2747 | ||
6b7cb247 | 2748 | return ret; |
da1fa91d KW |
2749 | } |
2750 | ||
c5fbe571 SH |
2751 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2752 | int nb_sectors, QEMUIOVector *qiov) | |
2753 | { | |
2754 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2755 | ||
f08f2dda SH |
2756 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2757 | } | |
2758 | ||
2759 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2760 | int64_t sector_num, int nb_sectors) | |
2761 | { | |
2762 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2763 | ||
2764 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2765 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2766 | } |
2767 | ||
83f64091 FB |
2768 | /** |
2769 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2770 | */ | |
2771 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2772 | { | |
2773 | BlockDriver *drv = bs->drv; | |
51762288 | 2774 | int ret; |
83f64091 | 2775 | if (!drv) |
19cb3738 | 2776 | return -ENOMEDIUM; |
83f64091 FB |
2777 | if (!drv->bdrv_truncate) |
2778 | return -ENOTSUP; | |
59f2689d NS |
2779 | if (bs->read_only) |
2780 | return -EACCES; | |
8591675f MT |
2781 | if (bdrv_in_use(bs)) |
2782 | return -EBUSY; | |
51762288 SH |
2783 | ret = drv->bdrv_truncate(bs, offset); |
2784 | if (ret == 0) { | |
2785 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2786 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2787 | } |
2788 | return ret; | |
83f64091 FB |
2789 | } |
2790 | ||
4a1d5e1f FZ |
2791 | /** |
2792 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2793 | * allocated space. Return < 0 if error or unknown. | |
2794 | */ | |
2795 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2796 | { | |
2797 | BlockDriver *drv = bs->drv; | |
2798 | if (!drv) { | |
2799 | return -ENOMEDIUM; | |
2800 | } | |
2801 | if (drv->bdrv_get_allocated_file_size) { | |
2802 | return drv->bdrv_get_allocated_file_size(bs); | |
2803 | } | |
2804 | if (bs->file) { | |
2805 | return bdrv_get_allocated_file_size(bs->file); | |
2806 | } | |
2807 | return -ENOTSUP; | |
2808 | } | |
2809 | ||
83f64091 FB |
2810 | /** |
2811 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2812 | */ | |
2813 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2814 | { | |
2815 | BlockDriver *drv = bs->drv; | |
2816 | if (!drv) | |
19cb3738 | 2817 | return -ENOMEDIUM; |
51762288 | 2818 | |
df2a6f29 | 2819 | if (bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2820 | if (drv->bdrv_getlength) { |
2821 | return drv->bdrv_getlength(bs); | |
2822 | } | |
83f64091 | 2823 | } |
46a4e4e6 | 2824 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2825 | } |
2826 | ||
19cb3738 | 2827 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2828 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2829 | { |
19cb3738 FB |
2830 | int64_t length; |
2831 | length = bdrv_getlength(bs); | |
2832 | if (length < 0) | |
2833 | length = 0; | |
2834 | else | |
6ea44308 | 2835 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2836 | *nb_sectors_ptr = length; |
fc01f7e7 | 2837 | } |
cf98951b | 2838 | |
ff06f5f3 PB |
2839 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
2840 | BlockdevOnError on_write_error) | |
abd7f68d MA |
2841 | { |
2842 | bs->on_read_error = on_read_error; | |
2843 | bs->on_write_error = on_write_error; | |
2844 | } | |
2845 | ||
1ceee0d5 | 2846 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
2847 | { |
2848 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2849 | } | |
2850 | ||
3e1caa5f PB |
2851 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
2852 | { | |
2853 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
2854 | ||
2855 | switch (on_err) { | |
2856 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2857 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
2858 | case BLOCKDEV_ON_ERROR_STOP: | |
2859 | return BDRV_ACTION_STOP; | |
2860 | case BLOCKDEV_ON_ERROR_REPORT: | |
2861 | return BDRV_ACTION_REPORT; | |
2862 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2863 | return BDRV_ACTION_IGNORE; | |
2864 | default: | |
2865 | abort(); | |
2866 | } | |
2867 | } | |
2868 | ||
2869 | /* This is done by device models because, while the block layer knows | |
2870 | * about the error, it does not know whether an operation comes from | |
2871 | * the device or the block layer (from a job, for example). | |
2872 | */ | |
2873 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
2874 | bool is_read, int error) | |
2875 | { | |
2876 | assert(error >= 0); | |
32c81a4a | 2877 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
2878 | if (action == BDRV_ACTION_STOP) { |
2879 | vm_stop(RUN_STATE_IO_ERROR); | |
2880 | bdrv_iostatus_set_err(bs, error); | |
2881 | } | |
2882 | } | |
2883 | ||
b338082b FB |
2884 | int bdrv_is_read_only(BlockDriverState *bs) |
2885 | { | |
2886 | return bs->read_only; | |
2887 | } | |
2888 | ||
985a03b0 TS |
2889 | int bdrv_is_sg(BlockDriverState *bs) |
2890 | { | |
2891 | return bs->sg; | |
2892 | } | |
2893 | ||
e900a7b7 CH |
2894 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2895 | { | |
2896 | return bs->enable_write_cache; | |
2897 | } | |
2898 | ||
425b0148 PB |
2899 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2900 | { | |
2901 | bs->enable_write_cache = wce; | |
55b110f2 JC |
2902 | |
2903 | /* so a reopen() will preserve wce */ | |
2904 | if (wce) { | |
2905 | bs->open_flags |= BDRV_O_CACHE_WB; | |
2906 | } else { | |
2907 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
2908 | } | |
425b0148 PB |
2909 | } |
2910 | ||
ea2384d3 FB |
2911 | int bdrv_is_encrypted(BlockDriverState *bs) |
2912 | { | |
2913 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2914 | return 1; | |
2915 | return bs->encrypted; | |
2916 | } | |
2917 | ||
c0f4ce77 AL |
2918 | int bdrv_key_required(BlockDriverState *bs) |
2919 | { | |
2920 | BlockDriverState *backing_hd = bs->backing_hd; | |
2921 | ||
2922 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2923 | return 1; | |
2924 | return (bs->encrypted && !bs->valid_key); | |
2925 | } | |
2926 | ||
ea2384d3 FB |
2927 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2928 | { | |
2929 | int ret; | |
2930 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2931 | ret = bdrv_set_key(bs->backing_hd, key); | |
2932 | if (ret < 0) | |
2933 | return ret; | |
2934 | if (!bs->encrypted) | |
2935 | return 0; | |
2936 | } | |
fd04a2ae SH |
2937 | if (!bs->encrypted) { |
2938 | return -EINVAL; | |
2939 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2940 | return -ENOMEDIUM; | |
2941 | } | |
c0f4ce77 | 2942 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2943 | if (ret < 0) { |
2944 | bs->valid_key = 0; | |
2945 | } else if (!bs->valid_key) { | |
2946 | bs->valid_key = 1; | |
2947 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2948 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2949 | } |
c0f4ce77 | 2950 | return ret; |
ea2384d3 FB |
2951 | } |
2952 | ||
f8d6bba1 | 2953 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2954 | { |
f8d6bba1 | 2955 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2956 | } |
2957 | ||
5fafdf24 | 2958 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2959 | void *opaque) |
2960 | { | |
2961 | BlockDriver *drv; | |
2962 | ||
8a22f02a | 2963 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2964 | it(opaque, drv->format_name); |
2965 | } | |
2966 | } | |
2967 | ||
b338082b FB |
2968 | BlockDriverState *bdrv_find(const char *name) |
2969 | { | |
2970 | BlockDriverState *bs; | |
2971 | ||
1b7bdbc1 SH |
2972 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2973 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2974 | return bs; |
1b7bdbc1 | 2975 | } |
b338082b FB |
2976 | } |
2977 | return NULL; | |
2978 | } | |
2979 | ||
2f399b0a MA |
2980 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2981 | { | |
2982 | if (!bs) { | |
2983 | return QTAILQ_FIRST(&bdrv_states); | |
2984 | } | |
2985 | return QTAILQ_NEXT(bs, list); | |
2986 | } | |
2987 | ||
51de9760 | 2988 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2989 | { |
2990 | BlockDriverState *bs; | |
2991 | ||
1b7bdbc1 | 2992 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2993 | it(opaque, bs); |
81d0912d FB |
2994 | } |
2995 | } | |
2996 | ||
ea2384d3 FB |
2997 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2998 | { | |
2999 | return bs->device_name; | |
3000 | } | |
3001 | ||
c8433287 MA |
3002 | int bdrv_get_flags(BlockDriverState *bs) |
3003 | { | |
3004 | return bs->open_flags; | |
3005 | } | |
3006 | ||
f0f0fdfe | 3007 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3008 | { |
3009 | BlockDriverState *bs; | |
f0f0fdfe | 3010 | int result = 0; |
c6ca28d6 | 3011 | |
1b7bdbc1 | 3012 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f0f0fdfe KW |
3013 | int ret = bdrv_flush(bs); |
3014 | if (ret < 0 && !result) { | |
3015 | result = ret; | |
3016 | } | |
1b7bdbc1 | 3017 | } |
f0f0fdfe KW |
3018 | |
3019 | return result; | |
c6ca28d6 AL |
3020 | } |
3021 | ||
3ac21627 PL |
3022 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3023 | { | |
3024 | return 1; | |
3025 | } | |
3026 | ||
f2feebbd KW |
3027 | int bdrv_has_zero_init(BlockDriverState *bs) |
3028 | { | |
3029 | assert(bs->drv); | |
3030 | ||
336c1c12 KW |
3031 | if (bs->drv->bdrv_has_zero_init) { |
3032 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3033 | } |
3034 | ||
3ac21627 PL |
3035 | /* safe default */ |
3036 | return 0; | |
f2feebbd KW |
3037 | } |
3038 | ||
376ae3f1 SH |
3039 | typedef struct BdrvCoIsAllocatedData { |
3040 | BlockDriverState *bs; | |
b35b2bba | 3041 | BlockDriverState *base; |
376ae3f1 SH |
3042 | int64_t sector_num; |
3043 | int nb_sectors; | |
3044 | int *pnum; | |
3045 | int ret; | |
3046 | bool done; | |
3047 | } BdrvCoIsAllocatedData; | |
3048 | ||
f58c7b35 TS |
3049 | /* |
3050 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3051 | * not implementing the functionality are assumed to not support backing files, | |
3052 | * hence all their sectors are reported as allocated. | |
3053 | * | |
bd9533e3 SH |
3054 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3055 | * and 'pnum' is set to 0. | |
3056 | * | |
f58c7b35 TS |
3057 | * 'pnum' is set to the number of sectors (including and immediately following |
3058 | * the specified sector) that are known to be in the same | |
3059 | * allocated/unallocated state. | |
3060 | * | |
bd9533e3 SH |
3061 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3062 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3063 | */ |
bdad13b9 PB |
3064 | static int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, |
3065 | int64_t sector_num, | |
3066 | int nb_sectors, int *pnum) | |
f58c7b35 | 3067 | { |
617ccb46 | 3068 | int64_t length; |
bd9533e3 SH |
3069 | int64_t n; |
3070 | ||
617ccb46 PB |
3071 | length = bdrv_getlength(bs); |
3072 | if (length < 0) { | |
3073 | return length; | |
3074 | } | |
3075 | ||
3076 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3077 | *pnum = 0; |
3078 | return 0; | |
3079 | } | |
3080 | ||
3081 | n = bs->total_sectors - sector_num; | |
3082 | if (n < nb_sectors) { | |
3083 | nb_sectors = n; | |
3084 | } | |
3085 | ||
6aebab14 | 3086 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 3087 | *pnum = nb_sectors; |
f58c7b35 TS |
3088 | return 1; |
3089 | } | |
6aebab14 | 3090 | |
060f51c9 SH |
3091 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
3092 | } | |
3093 | ||
3094 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
3095 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
3096 | { | |
3097 | BdrvCoIsAllocatedData *data = opaque; | |
3098 | BlockDriverState *bs = data->bs; | |
3099 | ||
3100 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
3101 | data->pnum); | |
3102 | data->done = true; | |
3103 | } | |
3104 | ||
3105 | /* | |
3106 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
3107 | * | |
3108 | * See bdrv_co_is_allocated() for details. | |
3109 | */ | |
3110 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
3111 | int *pnum) | |
3112 | { | |
6aebab14 SH |
3113 | Coroutine *co; |
3114 | BdrvCoIsAllocatedData data = { | |
3115 | .bs = bs, | |
3116 | .sector_num = sector_num, | |
3117 | .nb_sectors = nb_sectors, | |
3118 | .pnum = pnum, | |
3119 | .done = false, | |
3120 | }; | |
3121 | ||
bdad13b9 PB |
3122 | if (qemu_in_coroutine()) { |
3123 | /* Fast-path if already in coroutine context */ | |
3124 | bdrv_is_allocated_co_entry(&data); | |
3125 | } else { | |
3126 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
3127 | qemu_coroutine_enter(co, &data); | |
3128 | while (!data.done) { | |
3129 | qemu_aio_wait(); | |
3130 | } | |
6aebab14 SH |
3131 | } |
3132 | return data.ret; | |
f58c7b35 TS |
3133 | } |
3134 | ||
188a7bbf PB |
3135 | /* |
3136 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3137 | * | |
3138 | * Return true if the given sector is allocated in any image between | |
3139 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3140 | * sector is allocated in any image of the chain. Return false otherwise. | |
3141 | * | |
3142 | * 'pnum' is set to the number of sectors (including and immediately following | |
3143 | * the specified sector) that are known to be in the same | |
3144 | * allocated/unallocated state. | |
3145 | * | |
3146 | */ | |
4f578637 PB |
3147 | int bdrv_is_allocated_above(BlockDriverState *top, |
3148 | BlockDriverState *base, | |
3149 | int64_t sector_num, | |
3150 | int nb_sectors, int *pnum) | |
188a7bbf PB |
3151 | { |
3152 | BlockDriverState *intermediate; | |
3153 | int ret, n = nb_sectors; | |
3154 | ||
3155 | intermediate = top; | |
3156 | while (intermediate && intermediate != base) { | |
3157 | int pnum_inter; | |
bdad13b9 PB |
3158 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
3159 | &pnum_inter); | |
188a7bbf PB |
3160 | if (ret < 0) { |
3161 | return ret; | |
3162 | } else if (ret) { | |
3163 | *pnum = pnum_inter; | |
3164 | return 1; | |
3165 | } | |
3166 | ||
3167 | /* | |
3168 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3169 | * might have | |
3170 | * | |
3171 | * [sector_num+x, nr_sectors] allocated. | |
3172 | */ | |
63ba17d3 VI |
3173 | if (n > pnum_inter && |
3174 | (intermediate == top || | |
3175 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3176 | n = pnum_inter; |
3177 | } | |
3178 | ||
3179 | intermediate = intermediate->backing_hd; | |
3180 | } | |
3181 | ||
3182 | *pnum = n; | |
3183 | return 0; | |
3184 | } | |
3185 | ||
045df330 AL |
3186 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3187 | { | |
3188 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3189 | return bs->backing_file; | |
3190 | else if (bs->encrypted) | |
3191 | return bs->filename; | |
3192 | else | |
3193 | return NULL; | |
3194 | } | |
3195 | ||
5fafdf24 | 3196 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3197 | char *filename, int filename_size) |
3198 | { | |
3574c608 | 3199 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3200 | } |
3201 | ||
5fafdf24 | 3202 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3203 | const uint8_t *buf, int nb_sectors) |
3204 | { | |
3205 | BlockDriver *drv = bs->drv; | |
3206 | if (!drv) | |
19cb3738 | 3207 | return -ENOMEDIUM; |
faea38e7 FB |
3208 | if (!drv->bdrv_write_compressed) |
3209 | return -ENOTSUP; | |
fbb7b4e0 KW |
3210 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3211 | return -EIO; | |
a55eb92c | 3212 | |
1755da16 | 3213 | assert(!bs->dirty_bitmap); |
a55eb92c | 3214 | |
faea38e7 FB |
3215 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3216 | } | |
3b46e624 | 3217 | |
faea38e7 FB |
3218 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3219 | { | |
3220 | BlockDriver *drv = bs->drv; | |
3221 | if (!drv) | |
19cb3738 | 3222 | return -ENOMEDIUM; |
faea38e7 FB |
3223 | if (!drv->bdrv_get_info) |
3224 | return -ENOTSUP; | |
3225 | memset(bdi, 0, sizeof(*bdi)); | |
3226 | return drv->bdrv_get_info(bs, bdi); | |
3227 | } | |
3228 | ||
45566e9c CH |
3229 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3230 | int64_t pos, int size) | |
cf8074b3 KW |
3231 | { |
3232 | QEMUIOVector qiov; | |
3233 | struct iovec iov = { | |
3234 | .iov_base = (void *) buf, | |
3235 | .iov_len = size, | |
3236 | }; | |
3237 | ||
3238 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3239 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3240 | } | |
3241 | ||
3242 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
3243 | { |
3244 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
3245 | |
3246 | if (!drv) { | |
178e08a5 | 3247 | return -ENOMEDIUM; |
cf8074b3 KW |
3248 | } else if (drv->bdrv_save_vmstate) { |
3249 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
3250 | } else if (bs->file) { | |
3251 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
3252 | } | |
3253 | ||
7cdb1f6d | 3254 | return -ENOTSUP; |
178e08a5 AL |
3255 | } |
3256 | ||
45566e9c CH |
3257 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3258 | int64_t pos, int size) | |
178e08a5 AL |
3259 | { |
3260 | BlockDriver *drv = bs->drv; | |
3261 | if (!drv) | |
3262 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3263 | if (drv->bdrv_load_vmstate) |
3264 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3265 | if (bs->file) | |
3266 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3267 | return -ENOTSUP; | |
178e08a5 AL |
3268 | } |
3269 | ||
8b9b0cc2 KW |
3270 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3271 | { | |
bf736fe3 | 3272 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
3273 | return; |
3274 | } | |
3275 | ||
bf736fe3 | 3276 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3277 | } |
3278 | ||
3279 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3280 | const char *tag) | |
3281 | { | |
3282 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3283 | bs = bs->file; | |
3284 | } | |
3285 | ||
3286 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3287 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3288 | } | |
3289 | ||
3290 | return -ENOTSUP; | |
3291 | } | |
3292 | ||
3293 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) | |
3294 | { | |
3295 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3296 | bs = bs->file; | |
3297 | } | |
8b9b0cc2 | 3298 | |
41c695c7 KW |
3299 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3300 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3301 | } | |
3302 | ||
3303 | return -ENOTSUP; | |
3304 | } | |
3305 | ||
3306 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3307 | { | |
3308 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3309 | bs = bs->file; | |
3310 | } | |
3311 | ||
3312 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3313 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3314 | } | |
3315 | ||
3316 | return false; | |
8b9b0cc2 KW |
3317 | } |
3318 | ||
199630b6 BS |
3319 | int bdrv_is_snapshot(BlockDriverState *bs) |
3320 | { | |
3321 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3322 | } | |
3323 | ||
b1b1d783 JC |
3324 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3325 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3326 | * from a BDS as backing_file should not be done, as that may be relative to | |
3327 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3328 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3329 | const char *backing_file) | |
3330 | { | |
b1b1d783 JC |
3331 | char *filename_full = NULL; |
3332 | char *backing_file_full = NULL; | |
3333 | char *filename_tmp = NULL; | |
3334 | int is_protocol = 0; | |
3335 | BlockDriverState *curr_bs = NULL; | |
3336 | BlockDriverState *retval = NULL; | |
3337 | ||
3338 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3339 | return NULL; |
3340 | } | |
3341 | ||
b1b1d783 JC |
3342 | filename_full = g_malloc(PATH_MAX); |
3343 | backing_file_full = g_malloc(PATH_MAX); | |
3344 | filename_tmp = g_malloc(PATH_MAX); | |
3345 | ||
3346 | is_protocol = path_has_protocol(backing_file); | |
3347 | ||
3348 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3349 | ||
3350 | /* If either of the filename paths is actually a protocol, then | |
3351 | * compare unmodified paths; otherwise make paths relative */ | |
3352 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3353 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3354 | retval = curr_bs->backing_hd; | |
3355 | break; | |
3356 | } | |
e8a6bb9c | 3357 | } else { |
b1b1d783 JC |
3358 | /* If not an absolute filename path, make it relative to the current |
3359 | * image's filename path */ | |
3360 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3361 | backing_file); | |
3362 | ||
3363 | /* We are going to compare absolute pathnames */ | |
3364 | if (!realpath(filename_tmp, filename_full)) { | |
3365 | continue; | |
3366 | } | |
3367 | ||
3368 | /* We need to make sure the backing filename we are comparing against | |
3369 | * is relative to the current image filename (or absolute) */ | |
3370 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3371 | curr_bs->backing_file); | |
3372 | ||
3373 | if (!realpath(filename_tmp, backing_file_full)) { | |
3374 | continue; | |
3375 | } | |
3376 | ||
3377 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3378 | retval = curr_bs->backing_hd; | |
3379 | break; | |
3380 | } | |
e8a6bb9c MT |
3381 | } |
3382 | } | |
3383 | ||
b1b1d783 JC |
3384 | g_free(filename_full); |
3385 | g_free(backing_file_full); | |
3386 | g_free(filename_tmp); | |
3387 | return retval; | |
e8a6bb9c MT |
3388 | } |
3389 | ||
f198fd1c BC |
3390 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3391 | { | |
3392 | if (!bs->drv) { | |
3393 | return 0; | |
3394 | } | |
3395 | ||
3396 | if (!bs->backing_hd) { | |
3397 | return 0; | |
3398 | } | |
3399 | ||
3400 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3401 | } | |
3402 | ||
79fac568 JC |
3403 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3404 | { | |
3405 | BlockDriverState *curr_bs = NULL; | |
3406 | ||
3407 | if (!bs) { | |
3408 | return NULL; | |
3409 | } | |
3410 | ||
3411 | curr_bs = bs; | |
3412 | ||
3413 | while (curr_bs->backing_hd) { | |
3414 | curr_bs = curr_bs->backing_hd; | |
3415 | } | |
3416 | return curr_bs; | |
3417 | } | |
3418 | ||
ea2384d3 | 3419 | /**************************************************************/ |
83f64091 | 3420 | /* async I/Os */ |
ea2384d3 | 3421 | |
3b69e4b9 | 3422 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3423 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3424 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3425 | { |
bbf0a440 SH |
3426 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3427 | ||
b2a61371 | 3428 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3429 | cb, opaque, false); |
ea2384d3 FB |
3430 | } |
3431 | ||
f141eafe AL |
3432 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3433 | QEMUIOVector *qiov, int nb_sectors, | |
3434 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3435 | { |
bbf0a440 SH |
3436 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3437 | ||
1a6e115b | 3438 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3439 | cb, opaque, true); |
83f64091 FB |
3440 | } |
3441 | ||
40b4f539 KW |
3442 | |
3443 | typedef struct MultiwriteCB { | |
3444 | int error; | |
3445 | int num_requests; | |
3446 | int num_callbacks; | |
3447 | struct { | |
3448 | BlockDriverCompletionFunc *cb; | |
3449 | void *opaque; | |
3450 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3451 | } callbacks[]; |
3452 | } MultiwriteCB; | |
3453 | ||
3454 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3455 | { | |
3456 | int i; | |
3457 | ||
3458 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3459 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3460 | if (mcb->callbacks[i].free_qiov) { |
3461 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3462 | } | |
7267c094 | 3463 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3464 | } |
3465 | } | |
3466 | ||
3467 | static void multiwrite_cb(void *opaque, int ret) | |
3468 | { | |
3469 | MultiwriteCB *mcb = opaque; | |
3470 | ||
6d519a5f SH |
3471 | trace_multiwrite_cb(mcb, ret); |
3472 | ||
cb6d3ca0 | 3473 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3474 | mcb->error = ret; |
40b4f539 KW |
3475 | } |
3476 | ||
3477 | mcb->num_requests--; | |
3478 | if (mcb->num_requests == 0) { | |
de189a1b | 3479 | multiwrite_user_cb(mcb); |
7267c094 | 3480 | g_free(mcb); |
40b4f539 KW |
3481 | } |
3482 | } | |
3483 | ||
3484 | static int multiwrite_req_compare(const void *a, const void *b) | |
3485 | { | |
77be4366 CH |
3486 | const BlockRequest *req1 = a, *req2 = b; |
3487 | ||
3488 | /* | |
3489 | * Note that we can't simply subtract req2->sector from req1->sector | |
3490 | * here as that could overflow the return value. | |
3491 | */ | |
3492 | if (req1->sector > req2->sector) { | |
3493 | return 1; | |
3494 | } else if (req1->sector < req2->sector) { | |
3495 | return -1; | |
3496 | } else { | |
3497 | return 0; | |
3498 | } | |
40b4f539 KW |
3499 | } |
3500 | ||
3501 | /* | |
3502 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3503 | * requests that remain after merging. | |
3504 | */ | |
3505 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3506 | int num_reqs, MultiwriteCB *mcb) | |
3507 | { | |
3508 | int i, outidx; | |
3509 | ||
3510 | // Sort requests by start sector | |
3511 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3512 | ||
3513 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3514 | // filling up gaps with zero sectors. | |
3515 | outidx = 0; | |
3516 | for (i = 1; i < num_reqs; i++) { | |
3517 | int merge = 0; | |
3518 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3519 | ||
b6a127a1 | 3520 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3521 | if (reqs[i].sector <= oldreq_last) { |
3522 | merge = 1; | |
3523 | } | |
3524 | ||
e2a305fb CH |
3525 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3526 | merge = 0; | |
3527 | } | |
3528 | ||
40b4f539 KW |
3529 | if (merge) { |
3530 | size_t size; | |
7267c094 | 3531 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3532 | qemu_iovec_init(qiov, |
3533 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3534 | ||
3535 | // Add the first request to the merged one. If the requests are | |
3536 | // overlapping, drop the last sectors of the first request. | |
3537 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3538 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3539 | |
b6a127a1 PB |
3540 | // We should need to add any zeros between the two requests |
3541 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3542 | |
3543 | // Add the second request | |
1b093c48 | 3544 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3545 | |
cbf1dff2 | 3546 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3547 | reqs[outidx].qiov = qiov; |
3548 | ||
3549 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3550 | } else { | |
3551 | outidx++; | |
3552 | reqs[outidx].sector = reqs[i].sector; | |
3553 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3554 | reqs[outidx].qiov = reqs[i].qiov; | |
3555 | } | |
3556 | } | |
3557 | ||
3558 | return outidx + 1; | |
3559 | } | |
3560 | ||
3561 | /* | |
3562 | * Submit multiple AIO write requests at once. | |
3563 | * | |
3564 | * On success, the function returns 0 and all requests in the reqs array have | |
3565 | * been submitted. In error case this function returns -1, and any of the | |
3566 | * requests may or may not be submitted yet. In particular, this means that the | |
3567 | * callback will be called for some of the requests, for others it won't. The | |
3568 | * caller must check the error field of the BlockRequest to wait for the right | |
3569 | * callbacks (if error != 0, no callback will be called). | |
3570 | * | |
3571 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3572 | * requests. However, the fields opaque and error are left unmodified as they | |
3573 | * are used to signal failure for a single request to the caller. | |
3574 | */ | |
3575 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3576 | { | |
40b4f539 KW |
3577 | MultiwriteCB *mcb; |
3578 | int i; | |
3579 | ||
301db7c2 RH |
3580 | /* don't submit writes if we don't have a medium */ |
3581 | if (bs->drv == NULL) { | |
3582 | for (i = 0; i < num_reqs; i++) { | |
3583 | reqs[i].error = -ENOMEDIUM; | |
3584 | } | |
3585 | return -1; | |
3586 | } | |
3587 | ||
40b4f539 KW |
3588 | if (num_reqs == 0) { |
3589 | return 0; | |
3590 | } | |
3591 | ||
3592 | // Create MultiwriteCB structure | |
7267c094 | 3593 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3594 | mcb->num_requests = 0; |
3595 | mcb->num_callbacks = num_reqs; | |
3596 | ||
3597 | for (i = 0; i < num_reqs; i++) { | |
3598 | mcb->callbacks[i].cb = reqs[i].cb; | |
3599 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3600 | } | |
3601 | ||
3602 | // Check for mergable requests | |
3603 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3604 | ||
6d519a5f SH |
3605 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3606 | ||
df9309fb PB |
3607 | /* Run the aio requests. */ |
3608 | mcb->num_requests = num_reqs; | |
40b4f539 | 3609 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3610 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3611 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3612 | } |
3613 | ||
3614 | return 0; | |
40b4f539 KW |
3615 | } |
3616 | ||
83f64091 | 3617 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3618 | { |
d7331bed | 3619 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3620 | } |
3621 | ||
3622 | /**************************************************************/ | |
3623 | /* async block device emulation */ | |
3624 | ||
c16b5a2c CH |
3625 | typedef struct BlockDriverAIOCBSync { |
3626 | BlockDriverAIOCB common; | |
3627 | QEMUBH *bh; | |
3628 | int ret; | |
3629 | /* vector translation state */ | |
3630 | QEMUIOVector *qiov; | |
3631 | uint8_t *bounce; | |
3632 | int is_write; | |
3633 | } BlockDriverAIOCBSync; | |
3634 | ||
3635 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3636 | { | |
b666d239 KW |
3637 | BlockDriverAIOCBSync *acb = |
3638 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3639 | qemu_bh_delete(acb->bh); |
36afc451 | 3640 | acb->bh = NULL; |
c16b5a2c CH |
3641 | qemu_aio_release(acb); |
3642 | } | |
3643 | ||
d7331bed | 3644 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
3645 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
3646 | .cancel = bdrv_aio_cancel_em, | |
3647 | }; | |
3648 | ||
ce1a14dc | 3649 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3650 | { |
ce1a14dc | 3651 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3652 | |
f141eafe | 3653 | if (!acb->is_write) |
03396148 | 3654 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 3655 | qemu_vfree(acb->bounce); |
ce1a14dc | 3656 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3657 | qemu_bh_delete(acb->bh); |
36afc451 | 3658 | acb->bh = NULL; |
ce1a14dc | 3659 | qemu_aio_release(acb); |
83f64091 | 3660 | } |
beac80cd | 3661 | |
f141eafe AL |
3662 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3663 | int64_t sector_num, | |
3664 | QEMUIOVector *qiov, | |
3665 | int nb_sectors, | |
3666 | BlockDriverCompletionFunc *cb, | |
3667 | void *opaque, | |
3668 | int is_write) | |
3669 | ||
83f64091 | 3670 | { |
ce1a14dc | 3671 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3672 | |
d7331bed | 3673 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
3674 | acb->is_write = is_write; |
3675 | acb->qiov = qiov; | |
e268ca52 | 3676 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3677 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3678 | |
3679 | if (is_write) { | |
d5e6b161 | 3680 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 3681 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3682 | } else { |
1ed20acf | 3683 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3684 | } |
3685 | ||
ce1a14dc | 3686 | qemu_bh_schedule(acb->bh); |
f141eafe | 3687 | |
ce1a14dc | 3688 | return &acb->common; |
beac80cd FB |
3689 | } |
3690 | ||
f141eafe AL |
3691 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3692 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3693 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3694 | { |
f141eafe AL |
3695 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3696 | } | |
83f64091 | 3697 | |
f141eafe AL |
3698 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3699 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3700 | BlockDriverCompletionFunc *cb, void *opaque) | |
3701 | { | |
3702 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3703 | } |
beac80cd | 3704 | |
68485420 KW |
3705 | |
3706 | typedef struct BlockDriverAIOCBCoroutine { | |
3707 | BlockDriverAIOCB common; | |
3708 | BlockRequest req; | |
3709 | bool is_write; | |
d318aea9 | 3710 | bool *done; |
68485420 KW |
3711 | QEMUBH* bh; |
3712 | } BlockDriverAIOCBCoroutine; | |
3713 | ||
3714 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3715 | { | |
d318aea9 KW |
3716 | BlockDriverAIOCBCoroutine *acb = |
3717 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
3718 | bool done = false; | |
3719 | ||
3720 | acb->done = &done; | |
3721 | while (!done) { | |
3722 | qemu_aio_wait(); | |
3723 | } | |
68485420 KW |
3724 | } |
3725 | ||
d7331bed | 3726 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
3727 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
3728 | .cancel = bdrv_aio_co_cancel_em, | |
3729 | }; | |
3730 | ||
35246a68 | 3731 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3732 | { |
3733 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3734 | ||
3735 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
3736 | |
3737 | if (acb->done) { | |
3738 | *acb->done = true; | |
3739 | } | |
3740 | ||
68485420 KW |
3741 | qemu_bh_delete(acb->bh); |
3742 | qemu_aio_release(acb); | |
3743 | } | |
3744 | ||
b2a61371 SH |
3745 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3746 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3747 | { | |
3748 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3749 | BlockDriverState *bs = acb->common.bs; | |
3750 | ||
3751 | if (!acb->is_write) { | |
3752 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3753 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3754 | } else { |
3755 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3756 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3757 | } |
3758 | ||
35246a68 | 3759 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3760 | qemu_bh_schedule(acb->bh); |
3761 | } | |
3762 | ||
68485420 KW |
3763 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3764 | int64_t sector_num, | |
3765 | QEMUIOVector *qiov, | |
3766 | int nb_sectors, | |
3767 | BlockDriverCompletionFunc *cb, | |
3768 | void *opaque, | |
8c5873d6 | 3769 | bool is_write) |
68485420 KW |
3770 | { |
3771 | Coroutine *co; | |
3772 | BlockDriverAIOCBCoroutine *acb; | |
3773 | ||
d7331bed | 3774 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
3775 | acb->req.sector = sector_num; |
3776 | acb->req.nb_sectors = nb_sectors; | |
3777 | acb->req.qiov = qiov; | |
3778 | acb->is_write = is_write; | |
d318aea9 | 3779 | acb->done = NULL; |
68485420 | 3780 | |
8c5873d6 | 3781 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3782 | qemu_coroutine_enter(co, acb); |
3783 | ||
3784 | return &acb->common; | |
3785 | } | |
3786 | ||
07f07615 | 3787 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3788 | { |
07f07615 PB |
3789 | BlockDriverAIOCBCoroutine *acb = opaque; |
3790 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3791 | |
07f07615 PB |
3792 | acb->req.error = bdrv_co_flush(bs); |
3793 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3794 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3795 | } |
3796 | ||
07f07615 | 3797 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3798 | BlockDriverCompletionFunc *cb, void *opaque) |
3799 | { | |
07f07615 | 3800 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3801 | |
07f07615 PB |
3802 | Coroutine *co; |
3803 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3804 | |
d7331bed | 3805 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
3806 | acb->done = NULL; |
3807 | ||
07f07615 PB |
3808 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
3809 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3810 | |
016f5cf6 AG |
3811 | return &acb->common; |
3812 | } | |
3813 | ||
4265d620 PB |
3814 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3815 | { | |
3816 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3817 | BlockDriverState *bs = acb->common.bs; | |
3818 | ||
3819 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3820 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3821 | qemu_bh_schedule(acb->bh); | |
3822 | } | |
3823 | ||
3824 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3825 | int64_t sector_num, int nb_sectors, | |
3826 | BlockDriverCompletionFunc *cb, void *opaque) | |
3827 | { | |
3828 | Coroutine *co; | |
3829 | BlockDriverAIOCBCoroutine *acb; | |
3830 | ||
3831 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3832 | ||
d7331bed | 3833 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
3834 | acb->req.sector = sector_num; |
3835 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 3836 | acb->done = NULL; |
4265d620 PB |
3837 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
3838 | qemu_coroutine_enter(co, acb); | |
3839 | ||
3840 | return &acb->common; | |
3841 | } | |
3842 | ||
ea2384d3 FB |
3843 | void bdrv_init(void) |
3844 | { | |
5efa9d5a | 3845 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3846 | } |
ce1a14dc | 3847 | |
eb852011 MA |
3848 | void bdrv_init_with_whitelist(void) |
3849 | { | |
3850 | use_bdrv_whitelist = 1; | |
3851 | bdrv_init(); | |
3852 | } | |
3853 | ||
d7331bed | 3854 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 3855 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 3856 | { |
ce1a14dc PB |
3857 | BlockDriverAIOCB *acb; |
3858 | ||
d7331bed SH |
3859 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
3860 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
3861 | acb->bs = bs; |
3862 | acb->cb = cb; | |
3863 | acb->opaque = opaque; | |
3864 | return acb; | |
3865 | } | |
3866 | ||
3867 | void qemu_aio_release(void *p) | |
3868 | { | |
d37c975f | 3869 | BlockDriverAIOCB *acb = p; |
d7331bed | 3870 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 3871 | } |
19cb3738 | 3872 | |
f9f05dc5 KW |
3873 | /**************************************************************/ |
3874 | /* Coroutine block device emulation */ | |
3875 | ||
3876 | typedef struct CoroutineIOCompletion { | |
3877 | Coroutine *coroutine; | |
3878 | int ret; | |
3879 | } CoroutineIOCompletion; | |
3880 | ||
3881 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3882 | { | |
3883 | CoroutineIOCompletion *co = opaque; | |
3884 | ||
3885 | co->ret = ret; | |
3886 | qemu_coroutine_enter(co->coroutine, NULL); | |
3887 | } | |
3888 | ||
3889 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3890 | int nb_sectors, QEMUIOVector *iov, | |
3891 | bool is_write) | |
3892 | { | |
3893 | CoroutineIOCompletion co = { | |
3894 | .coroutine = qemu_coroutine_self(), | |
3895 | }; | |
3896 | BlockDriverAIOCB *acb; | |
3897 | ||
3898 | if (is_write) { | |
a652d160 SH |
3899 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3900 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3901 | } else { |
a652d160 SH |
3902 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3903 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3904 | } |
3905 | ||
59370aaa | 3906 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3907 | if (!acb) { |
3908 | return -EIO; | |
3909 | } | |
3910 | qemu_coroutine_yield(); | |
3911 | ||
3912 | return co.ret; | |
3913 | } | |
3914 | ||
3915 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3916 | int64_t sector_num, int nb_sectors, | |
3917 | QEMUIOVector *iov) | |
3918 | { | |
3919 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
3920 | } | |
3921 | ||
3922 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
3923 | int64_t sector_num, int nb_sectors, | |
3924 | QEMUIOVector *iov) | |
3925 | { | |
3926 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3927 | } | |
3928 | ||
07f07615 | 3929 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 3930 | { |
07f07615 PB |
3931 | RwCo *rwco = opaque; |
3932 | ||
3933 | rwco->ret = bdrv_co_flush(rwco->bs); | |
3934 | } | |
3935 | ||
3936 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
3937 | { | |
eb489bb1 KW |
3938 | int ret; |
3939 | ||
29cdb251 | 3940 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 3941 | return 0; |
eb489bb1 KW |
3942 | } |
3943 | ||
ca716364 | 3944 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 3945 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
3946 | if (bs->drv->bdrv_co_flush_to_os) { |
3947 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
3948 | if (ret < 0) { | |
3949 | return ret; | |
3950 | } | |
3951 | } | |
3952 | ||
ca716364 KW |
3953 | /* But don't actually force it to the disk with cache=unsafe */ |
3954 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 3955 | goto flush_parent; |
ca716364 KW |
3956 | } |
3957 | ||
bf736fe3 | 3958 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 3959 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 3960 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
3961 | } else if (bs->drv->bdrv_aio_flush) { |
3962 | BlockDriverAIOCB *acb; | |
3963 | CoroutineIOCompletion co = { | |
3964 | .coroutine = qemu_coroutine_self(), | |
3965 | }; | |
3966 | ||
3967 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3968 | if (acb == NULL) { | |
29cdb251 | 3969 | ret = -EIO; |
07f07615 PB |
3970 | } else { |
3971 | qemu_coroutine_yield(); | |
29cdb251 | 3972 | ret = co.ret; |
07f07615 | 3973 | } |
07f07615 PB |
3974 | } else { |
3975 | /* | |
3976 | * Some block drivers always operate in either writethrough or unsafe | |
3977 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
3978 | * know how the server works (because the behaviour is hardcoded or | |
3979 | * depends on server-side configuration), so we can't ensure that | |
3980 | * everything is safe on disk. Returning an error doesn't work because | |
3981 | * that would break guests even if the server operates in writethrough | |
3982 | * mode. | |
3983 | * | |
3984 | * Let's hope the user knows what he's doing. | |
3985 | */ | |
29cdb251 | 3986 | ret = 0; |
07f07615 | 3987 | } |
29cdb251 PB |
3988 | if (ret < 0) { |
3989 | return ret; | |
3990 | } | |
3991 | ||
3992 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
3993 | * in the case of cache=unsafe, so there are no useless flushes. | |
3994 | */ | |
d4c82329 | 3995 | flush_parent: |
29cdb251 | 3996 | return bdrv_co_flush(bs->file); |
07f07615 PB |
3997 | } |
3998 | ||
0f15423c AL |
3999 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4000 | { | |
4001 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4002 | bs->drv->bdrv_invalidate_cache(bs); | |
4003 | } | |
4004 | } | |
4005 | ||
4006 | void bdrv_invalidate_cache_all(void) | |
4007 | { | |
4008 | BlockDriverState *bs; | |
4009 | ||
4010 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4011 | bdrv_invalidate_cache(bs); | |
4012 | } | |
4013 | } | |
4014 | ||
07789269 BC |
4015 | void bdrv_clear_incoming_migration_all(void) |
4016 | { | |
4017 | BlockDriverState *bs; | |
4018 | ||
4019 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4020 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4021 | } | |
4022 | } | |
4023 | ||
07f07615 PB |
4024 | int bdrv_flush(BlockDriverState *bs) |
4025 | { | |
4026 | Coroutine *co; | |
4027 | RwCo rwco = { | |
4028 | .bs = bs, | |
4029 | .ret = NOT_DONE, | |
e7a8a783 | 4030 | }; |
e7a8a783 | 4031 | |
07f07615 PB |
4032 | if (qemu_in_coroutine()) { |
4033 | /* Fast-path if already in coroutine context */ | |
4034 | bdrv_flush_co_entry(&rwco); | |
4035 | } else { | |
4036 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4037 | qemu_coroutine_enter(co, &rwco); | |
4038 | while (rwco.ret == NOT_DONE) { | |
4039 | qemu_aio_wait(); | |
4040 | } | |
e7a8a783 | 4041 | } |
07f07615 PB |
4042 | |
4043 | return rwco.ret; | |
e7a8a783 KW |
4044 | } |
4045 | ||
4265d620 PB |
4046 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4047 | { | |
4048 | RwCo *rwco = opaque; | |
4049 | ||
4050 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4051 | } | |
4052 | ||
4053 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
4054 | int nb_sectors) | |
4055 | { | |
4056 | if (!bs->drv) { | |
4057 | return -ENOMEDIUM; | |
4058 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4059 | return -EIO; | |
4060 | } else if (bs->read_only) { | |
4061 | return -EROFS; | |
df702c9b PB |
4062 | } |
4063 | ||
4064 | if (bs->dirty_bitmap) { | |
8f0720ec | 4065 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b PB |
4066 | } |
4067 | ||
9e8f1835 PB |
4068 | /* Do nothing if disabled. */ |
4069 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4070 | return 0; | |
4071 | } | |
4072 | ||
df702c9b | 4073 | if (bs->drv->bdrv_co_discard) { |
4265d620 PB |
4074 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
4075 | } else if (bs->drv->bdrv_aio_discard) { | |
4076 | BlockDriverAIOCB *acb; | |
4077 | CoroutineIOCompletion co = { | |
4078 | .coroutine = qemu_coroutine_self(), | |
4079 | }; | |
4080 | ||
4081 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4082 | bdrv_co_io_em_complete, &co); | |
4083 | if (acb == NULL) { | |
4084 | return -EIO; | |
4085 | } else { | |
4086 | qemu_coroutine_yield(); | |
4087 | return co.ret; | |
4088 | } | |
4265d620 PB |
4089 | } else { |
4090 | return 0; | |
4091 | } | |
4092 | } | |
4093 | ||
4094 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4095 | { | |
4096 | Coroutine *co; | |
4097 | RwCo rwco = { | |
4098 | .bs = bs, | |
4099 | .sector_num = sector_num, | |
4100 | .nb_sectors = nb_sectors, | |
4101 | .ret = NOT_DONE, | |
4102 | }; | |
4103 | ||
4104 | if (qemu_in_coroutine()) { | |
4105 | /* Fast-path if already in coroutine context */ | |
4106 | bdrv_discard_co_entry(&rwco); | |
4107 | } else { | |
4108 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4109 | qemu_coroutine_enter(co, &rwco); | |
4110 | while (rwco.ret == NOT_DONE) { | |
4111 | qemu_aio_wait(); | |
4112 | } | |
4113 | } | |
4114 | ||
4115 | return rwco.ret; | |
4116 | } | |
4117 | ||
19cb3738 FB |
4118 | /**************************************************************/ |
4119 | /* removable device support */ | |
4120 | ||
4121 | /** | |
4122 | * Return TRUE if the media is present | |
4123 | */ | |
4124 | int bdrv_is_inserted(BlockDriverState *bs) | |
4125 | { | |
4126 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4127 | |
19cb3738 FB |
4128 | if (!drv) |
4129 | return 0; | |
4130 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4131 | return 1; |
4132 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4133 | } |
4134 | ||
4135 | /** | |
8e49ca46 MA |
4136 | * Return whether the media changed since the last call to this |
4137 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4138 | */ |
4139 | int bdrv_media_changed(BlockDriverState *bs) | |
4140 | { | |
4141 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4142 | |
8e49ca46 MA |
4143 | if (drv && drv->bdrv_media_changed) { |
4144 | return drv->bdrv_media_changed(bs); | |
4145 | } | |
4146 | return -ENOTSUP; | |
19cb3738 FB |
4147 | } |
4148 | ||
4149 | /** | |
4150 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4151 | */ | |
f36f3949 | 4152 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4153 | { |
4154 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4155 | |
822e1cd1 MA |
4156 | if (drv && drv->bdrv_eject) { |
4157 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4158 | } |
6f382ed2 LC |
4159 | |
4160 | if (bs->device_name[0] != '\0') { | |
4161 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4162 | } | |
19cb3738 FB |
4163 | } |
4164 | ||
19cb3738 FB |
4165 | /** |
4166 | * Lock or unlock the media (if it is locked, the user won't be able | |
4167 | * to eject it manually). | |
4168 | */ | |
025e849a | 4169 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4170 | { |
4171 | BlockDriver *drv = bs->drv; | |
4172 | ||
025e849a | 4173 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4174 | |
025e849a MA |
4175 | if (drv && drv->bdrv_lock_medium) { |
4176 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4177 | } |
4178 | } | |
985a03b0 TS |
4179 | |
4180 | /* needed for generic scsi interface */ | |
4181 | ||
4182 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4183 | { | |
4184 | BlockDriver *drv = bs->drv; | |
4185 | ||
4186 | if (drv && drv->bdrv_ioctl) | |
4187 | return drv->bdrv_ioctl(bs, req, buf); | |
4188 | return -ENOTSUP; | |
4189 | } | |
7d780669 | 4190 | |
221f715d AL |
4191 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4192 | unsigned long int req, void *buf, | |
4193 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4194 | { |
221f715d | 4195 | BlockDriver *drv = bs->drv; |
7d780669 | 4196 | |
221f715d AL |
4197 | if (drv && drv->bdrv_aio_ioctl) |
4198 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4199 | return NULL; | |
7d780669 | 4200 | } |
e268ca52 | 4201 | |
7b6f9300 MA |
4202 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4203 | { | |
4204 | bs->buffer_alignment = align; | |
4205 | } | |
7cd1e32a | 4206 | |
e268ca52 AL |
4207 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4208 | { | |
4209 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4210 | } | |
7cd1e32a | 4211 | |
c53b1c51 SH |
4212 | /* |
4213 | * Check if all memory in this vector is sector aligned. | |
4214 | */ | |
4215 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4216 | { | |
4217 | int i; | |
4218 | ||
4219 | for (i = 0; i < qiov->niov; i++) { | |
4220 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4221 | return false; | |
4222 | } | |
4223 | } | |
4224 | ||
4225 | return true; | |
4226 | } | |
4227 | ||
50717e94 | 4228 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity) |
7cd1e32a LS |
4229 | { |
4230 | int64_t bitmap_size; | |
a55eb92c | 4231 | |
50717e94 PB |
4232 | assert((granularity & (granularity - 1)) == 0); |
4233 | ||
4234 | if (granularity) { | |
4235 | granularity >>= BDRV_SECTOR_BITS; | |
4236 | assert(!bs->dirty_bitmap); | |
4237 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4238 | bs->dirty_bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
7cd1e32a | 4239 | } else { |
c6d22830 | 4240 | if (bs->dirty_bitmap) { |
8f0720ec | 4241 | hbitmap_free(bs->dirty_bitmap); |
c6d22830 | 4242 | bs->dirty_bitmap = NULL; |
a55eb92c | 4243 | } |
7cd1e32a LS |
4244 | } |
4245 | } | |
4246 | ||
4247 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4248 | { | |
8f0720ec PB |
4249 | if (bs->dirty_bitmap) { |
4250 | return hbitmap_get(bs->dirty_bitmap, sector); | |
7cd1e32a LS |
4251 | } else { |
4252 | return 0; | |
4253 | } | |
4254 | } | |
4255 | ||
8f0720ec | 4256 | void bdrv_dirty_iter_init(BlockDriverState *bs, HBitmapIter *hbi) |
1755da16 | 4257 | { |
8f0720ec | 4258 | hbitmap_iter_init(hbi, bs->dirty_bitmap, 0); |
1755da16 PB |
4259 | } |
4260 | ||
4261 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4262 | int nr_sectors) | |
4263 | { | |
8f0720ec | 4264 | hbitmap_set(bs->dirty_bitmap, cur_sector, nr_sectors); |
1755da16 PB |
4265 | } |
4266 | ||
a55eb92c JK |
4267 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4268 | int nr_sectors) | |
7cd1e32a | 4269 | { |
8f0720ec | 4270 | hbitmap_reset(bs->dirty_bitmap, cur_sector, nr_sectors); |
7cd1e32a | 4271 | } |
aaa0eb75 LS |
4272 | |
4273 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4274 | { | |
8f0720ec | 4275 | if (bs->dirty_bitmap) { |
acc906c6 | 4276 | return hbitmap_count(bs->dirty_bitmap); |
8f0720ec PB |
4277 | } else { |
4278 | return 0; | |
4279 | } | |
aaa0eb75 | 4280 | } |
f88e1a42 | 4281 | |
9fcb0251 FZ |
4282 | /* Get a reference to bs */ |
4283 | void bdrv_ref(BlockDriverState *bs) | |
4284 | { | |
4285 | bs->refcnt++; | |
4286 | } | |
4287 | ||
4288 | /* Release a previously grabbed reference to bs. | |
4289 | * If after releasing, reference count is zero, the BlockDriverState is | |
4290 | * deleted. */ | |
4291 | void bdrv_unref(BlockDriverState *bs) | |
4292 | { | |
4293 | assert(bs->refcnt > 0); | |
4294 | if (--bs->refcnt == 0) { | |
4295 | bdrv_delete(bs); | |
4296 | } | |
4297 | } | |
4298 | ||
db593f25 MT |
4299 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4300 | { | |
4301 | assert(bs->in_use != in_use); | |
4302 | bs->in_use = in_use; | |
4303 | } | |
4304 | ||
4305 | int bdrv_in_use(BlockDriverState *bs) | |
4306 | { | |
4307 | return bs->in_use; | |
4308 | } | |
4309 | ||
28a7282a LC |
4310 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4311 | { | |
d6bf279e | 4312 | bs->iostatus_enabled = true; |
58e21ef5 | 4313 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4314 | } |
4315 | ||
4316 | /* The I/O status is only enabled if the drive explicitly | |
4317 | * enables it _and_ the VM is configured to stop on errors */ | |
4318 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4319 | { | |
d6bf279e | 4320 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4321 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4322 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4323 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4324 | } |
4325 | ||
4326 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4327 | { | |
d6bf279e | 4328 | bs->iostatus_enabled = false; |
28a7282a LC |
4329 | } |
4330 | ||
4331 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4332 | { | |
4333 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4334 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4335 | if (bs->job) { |
4336 | block_job_iostatus_reset(bs->job); | |
4337 | } | |
28a7282a LC |
4338 | } |
4339 | } | |
4340 | ||
28a7282a LC |
4341 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4342 | { | |
3e1caa5f PB |
4343 | assert(bdrv_iostatus_is_enabled(bs)); |
4344 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4345 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4346 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4347 | } |
4348 | } | |
4349 | ||
a597e79c CH |
4350 | void |
4351 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4352 | enum BlockAcctType type) | |
4353 | { | |
4354 | assert(type < BDRV_MAX_IOTYPE); | |
4355 | ||
4356 | cookie->bytes = bytes; | |
c488c7f6 | 4357 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4358 | cookie->type = type; |
4359 | } | |
4360 | ||
4361 | void | |
4362 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4363 | { | |
4364 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4365 | ||
4366 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4367 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4368 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4369 | } |
4370 | ||
d92ada22 LC |
4371 | void bdrv_img_create(const char *filename, const char *fmt, |
4372 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4373 | char *options, uint64_t img_size, int flags, |
4374 | Error **errp, bool quiet) | |
f88e1a42 JS |
4375 | { |
4376 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4377 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4378 | BlockDriverState *bs = NULL; |
4379 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4380 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4381 | int ret = 0; |
4382 | ||
4383 | /* Find driver and parse its options */ | |
4384 | drv = bdrv_find_format(fmt); | |
4385 | if (!drv) { | |
71c79813 | 4386 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4387 | return; |
f88e1a42 JS |
4388 | } |
4389 | ||
98289620 | 4390 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 4391 | if (!proto_drv) { |
71c79813 | 4392 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4393 | return; |
f88e1a42 JS |
4394 | } |
4395 | ||
4396 | create_options = append_option_parameters(create_options, | |
4397 | drv->create_options); | |
4398 | create_options = append_option_parameters(create_options, | |
4399 | proto_drv->create_options); | |
4400 | ||
4401 | /* Create parameter list with default values */ | |
4402 | param = parse_option_parameters("", create_options, param); | |
4403 | ||
4404 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4405 | ||
4406 | /* Parse -o options */ | |
4407 | if (options) { | |
4408 | param = parse_option_parameters(options, create_options, param); | |
4409 | if (param == NULL) { | |
71c79813 | 4410 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4411 | goto out; |
4412 | } | |
4413 | } | |
4414 | ||
4415 | if (base_filename) { | |
4416 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4417 | base_filename)) { | |
71c79813 LC |
4418 | error_setg(errp, "Backing file not supported for file format '%s'", |
4419 | fmt); | |
f88e1a42 JS |
4420 | goto out; |
4421 | } | |
4422 | } | |
4423 | ||
4424 | if (base_fmt) { | |
4425 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4426 | error_setg(errp, "Backing file format not supported for file " |
4427 | "format '%s'", fmt); | |
f88e1a42 JS |
4428 | goto out; |
4429 | } | |
4430 | } | |
4431 | ||
792da93a JS |
4432 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4433 | if (backing_file && backing_file->value.s) { | |
4434 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4435 | error_setg(errp, "Error: Trying to create an image with the " |
4436 | "same filename as the backing file"); | |
792da93a JS |
4437 | goto out; |
4438 | } | |
4439 | } | |
4440 | ||
f88e1a42 JS |
4441 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4442 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4443 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4444 | if (!backing_drv) { | |
71c79813 LC |
4445 | error_setg(errp, "Unknown backing file format '%s'", |
4446 | backing_fmt->value.s); | |
f88e1a42 JS |
4447 | goto out; |
4448 | } | |
4449 | } | |
4450 | ||
4451 | // The size for the image must always be specified, with one exception: | |
4452 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4453 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4454 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4455 | if (backing_file && backing_file->value.s) { |
4456 | uint64_t size; | |
f88e1a42 | 4457 | char buf[32]; |
63090dac PB |
4458 | int back_flags; |
4459 | ||
4460 | /* backing files always opened read-only */ | |
4461 | back_flags = | |
4462 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4463 | |
f88e1a42 JS |
4464 | bs = bdrv_new(""); |
4465 | ||
de9c0cec KW |
4466 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
4467 | backing_drv); | |
f88e1a42 | 4468 | if (ret < 0) { |
71c79813 LC |
4469 | error_setg_errno(errp, -ret, "Could not open '%s'", |
4470 | backing_file->value.s); | |
f88e1a42 JS |
4471 | goto out; |
4472 | } | |
4473 | bdrv_get_geometry(bs, &size); | |
4474 | size *= 512; | |
4475 | ||
4476 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4477 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4478 | } else { | |
71c79813 | 4479 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4480 | goto out; |
4481 | } | |
4482 | } | |
4483 | ||
f382d43a MR |
4484 | if (!quiet) { |
4485 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4486 | print_option_parameters(param); | |
4487 | puts(""); | |
4488 | } | |
f88e1a42 | 4489 | ret = bdrv_create(drv, filename, param); |
f88e1a42 JS |
4490 | if (ret < 0) { |
4491 | if (ret == -ENOTSUP) { | |
71c79813 LC |
4492 | error_setg(errp,"Formatting or formatting option not supported for " |
4493 | "file format '%s'", fmt); | |
f88e1a42 | 4494 | } else if (ret == -EFBIG) { |
f3f4d2c0 KW |
4495 | const char *cluster_size_hint = ""; |
4496 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
4497 | cluster_size_hint = " (try using a larger cluster size)"; | |
4498 | } | |
4499 | error_setg(errp, "The image size is too large for file format '%s'%s", | |
4500 | fmt, cluster_size_hint); | |
f88e1a42 | 4501 | } else { |
71c79813 LC |
4502 | error_setg(errp, "%s: error while creating %s: %s", filename, fmt, |
4503 | strerror(-ret)); | |
f88e1a42 JS |
4504 | } |
4505 | } | |
4506 | ||
4507 | out: | |
4508 | free_option_parameters(create_options); | |
4509 | free_option_parameters(param); | |
4510 | ||
4511 | if (bs) { | |
4f6fd349 | 4512 | bdrv_unref(bs); |
f88e1a42 | 4513 | } |
f88e1a42 | 4514 | } |
85d126f3 SH |
4515 | |
4516 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
4517 | { | |
4518 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
4519 | return qemu_get_aio_context(); | |
4520 | } | |
d616b224 SH |
4521 | |
4522 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
4523 | NotifierWithReturn *notifier) | |
4524 | { | |
4525 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
4526 | } |