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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
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" |
c13163fb | 35 | #include "block/qapi.h" |
b2023818 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
fc01f7e7 | 38 | |
71e72a19 | 39 | #ifdef CONFIG_BSD |
7674e7bf FB |
40 | #include <sys/types.h> |
41 | #include <sys/stat.h> | |
42 | #include <sys/ioctl.h> | |
72cf2d4f | 43 | #include <sys/queue.h> |
c5e97233 | 44 | #ifndef __DragonFly__ |
7674e7bf FB |
45 | #include <sys/disk.h> |
46 | #endif | |
c5e97233 | 47 | #endif |
7674e7bf | 48 | |
49dc768d AL |
49 | #ifdef _WIN32 |
50 | #include <windows.h> | |
51 | #endif | |
52 | ||
e4654d2d FZ |
53 | struct BdrvDirtyBitmap { |
54 | HBitmap *bitmap; | |
55 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
56 | }; | |
57 | ||
1c9805a3 SH |
58 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
59 | ||
7d4b4ba5 | 60 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
61 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
62 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 63 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
64 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 66 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
67 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
68 | int64_t sector_num, int nb_sectors, | |
69 | QEMUIOVector *iov); | |
70 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
71 | int64_t sector_num, int nb_sectors, | |
72 | QEMUIOVector *iov); | |
775aa8b6 KW |
73 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
74 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
470c0504 | 75 | BdrvRequestFlags flags); |
775aa8b6 KW |
76 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
f08f2dda | 78 | BdrvRequestFlags flags); |
b2a61371 SH |
79 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
80 | int64_t sector_num, | |
81 | QEMUIOVector *qiov, | |
82 | int nb_sectors, | |
d20d9b7c | 83 | BdrvRequestFlags flags, |
b2a61371 SH |
84 | BlockDriverCompletionFunc *cb, |
85 | void *opaque, | |
8c5873d6 | 86 | bool is_write); |
b2a61371 | 87 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 88 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 89 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 90 | |
1b7bdbc1 SH |
91 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
92 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 93 | |
dc364f4c BC |
94 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
95 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
96 | ||
8a22f02a SH |
97 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
98 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 99 | |
eb852011 MA |
100 | /* If non-zero, use only whitelisted block drivers */ |
101 | static int use_bdrv_whitelist; | |
102 | ||
9e0b22f4 SH |
103 | #ifdef _WIN32 |
104 | static int is_windows_drive_prefix(const char *filename) | |
105 | { | |
106 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
107 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
108 | filename[1] == ':'); | |
109 | } | |
110 | ||
111 | int is_windows_drive(const char *filename) | |
112 | { | |
113 | if (is_windows_drive_prefix(filename) && | |
114 | filename[2] == '\0') | |
115 | return 1; | |
116 | if (strstart(filename, "\\\\.\\", NULL) || | |
117 | strstart(filename, "//./", NULL)) | |
118 | return 1; | |
119 | return 0; | |
120 | } | |
121 | #endif | |
122 | ||
0563e191 | 123 | /* throttling disk I/O limits */ |
cc0681c4 BC |
124 | void bdrv_set_io_limits(BlockDriverState *bs, |
125 | ThrottleConfig *cfg) | |
98f90dba | 126 | { |
cc0681c4 | 127 | int i; |
98f90dba | 128 | |
cc0681c4 | 129 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 130 | |
cc0681c4 BC |
131 | for (i = 0; i < 2; i++) { |
132 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 133 | } |
cc0681c4 BC |
134 | } |
135 | ||
136 | /* this function drain all the throttled IOs */ | |
137 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
138 | { | |
139 | bool drained = false; | |
140 | bool enabled = bs->io_limits_enabled; | |
141 | int i; | |
142 | ||
143 | bs->io_limits_enabled = false; | |
144 | ||
145 | for (i = 0; i < 2; i++) { | |
146 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
147 | drained = true; | |
148 | } | |
149 | } | |
150 | ||
151 | bs->io_limits_enabled = enabled; | |
98f90dba | 152 | |
cc0681c4 | 153 | return drained; |
98f90dba ZYW |
154 | } |
155 | ||
cc0681c4 | 156 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 157 | { |
cc0681c4 | 158 | bs->io_limits_enabled = false; |
0563e191 | 159 | |
cc0681c4 BC |
160 | bdrv_start_throttled_reqs(bs); |
161 | ||
162 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
163 | } |
164 | ||
cc0681c4 | 165 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 166 | { |
cc0681c4 BC |
167 | BlockDriverState *bs = opaque; |
168 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
169 | } |
170 | ||
cc0681c4 | 171 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 172 | { |
cc0681c4 BC |
173 | BlockDriverState *bs = opaque; |
174 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
175 | } |
176 | ||
cc0681c4 BC |
177 | /* should be called before bdrv_set_io_limits if a limit is set */ |
178 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
179 | { | |
180 | assert(!bs->io_limits_enabled); | |
181 | throttle_init(&bs->throttle_state, | |
182 | QEMU_CLOCK_VIRTUAL, | |
183 | bdrv_throttle_read_timer_cb, | |
184 | bdrv_throttle_write_timer_cb, | |
185 | bs); | |
186 | bs->io_limits_enabled = true; | |
187 | } | |
188 | ||
189 | /* This function makes an IO wait if needed | |
190 | * | |
191 | * @nb_sectors: the number of sectors of the IO | |
192 | * @is_write: is the IO a write | |
193 | */ | |
98f90dba | 194 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 195 | unsigned int bytes, |
cc0681c4 | 196 | bool is_write) |
98f90dba | 197 | { |
cc0681c4 BC |
198 | /* does this io must wait */ |
199 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 200 | |
cc0681c4 BC |
201 | /* if must wait or any request of this type throttled queue the IO */ |
202 | if (must_wait || | |
203 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
204 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
205 | } |
206 | ||
cc0681c4 | 207 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
208 | throttle_account(&bs->throttle_state, is_write, bytes); |
209 | ||
98f90dba | 210 | |
cc0681c4 BC |
211 | /* if the next request must wait -> do nothing */ |
212 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
213 | return; | |
98f90dba ZYW |
214 | } |
215 | ||
cc0681c4 BC |
216 | /* else queue next request for execution */ |
217 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
218 | } |
219 | ||
339064d5 KW |
220 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
221 | { | |
222 | if (!bs || !bs->drv) { | |
223 | /* 4k should be on the safe side */ | |
224 | return 4096; | |
225 | } | |
226 | ||
227 | return bs->bl.opt_mem_alignment; | |
228 | } | |
229 | ||
9e0b22f4 SH |
230 | /* check if the path starts with "<protocol>:" */ |
231 | static int path_has_protocol(const char *path) | |
232 | { | |
947995c0 PB |
233 | const char *p; |
234 | ||
9e0b22f4 SH |
235 | #ifdef _WIN32 |
236 | if (is_windows_drive(path) || | |
237 | is_windows_drive_prefix(path)) { | |
238 | return 0; | |
239 | } | |
947995c0 PB |
240 | p = path + strcspn(path, ":/\\"); |
241 | #else | |
242 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
243 | #endif |
244 | ||
947995c0 | 245 | return *p == ':'; |
9e0b22f4 SH |
246 | } |
247 | ||
83f64091 | 248 | int path_is_absolute(const char *path) |
3b0d4f61 | 249 | { |
21664424 FB |
250 | #ifdef _WIN32 |
251 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 252 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 253 | return 1; |
f53f4da9 PB |
254 | } |
255 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 256 | #else |
f53f4da9 | 257 | return (*path == '/'); |
3b9f94e1 | 258 | #endif |
3b0d4f61 FB |
259 | } |
260 | ||
83f64091 FB |
261 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
262 | path to it by considering it is relative to base_path. URL are | |
263 | supported. */ | |
264 | void path_combine(char *dest, int dest_size, | |
265 | const char *base_path, | |
266 | const char *filename) | |
3b0d4f61 | 267 | { |
83f64091 FB |
268 | const char *p, *p1; |
269 | int len; | |
270 | ||
271 | if (dest_size <= 0) | |
272 | return; | |
273 | if (path_is_absolute(filename)) { | |
274 | pstrcpy(dest, dest_size, filename); | |
275 | } else { | |
276 | p = strchr(base_path, ':'); | |
277 | if (p) | |
278 | p++; | |
279 | else | |
280 | p = base_path; | |
3b9f94e1 FB |
281 | p1 = strrchr(base_path, '/'); |
282 | #ifdef _WIN32 | |
283 | { | |
284 | const char *p2; | |
285 | p2 = strrchr(base_path, '\\'); | |
286 | if (!p1 || p2 > p1) | |
287 | p1 = p2; | |
288 | } | |
289 | #endif | |
83f64091 FB |
290 | if (p1) |
291 | p1++; | |
292 | else | |
293 | p1 = base_path; | |
294 | if (p1 > p) | |
295 | p = p1; | |
296 | len = p - base_path; | |
297 | if (len > dest_size - 1) | |
298 | len = dest_size - 1; | |
299 | memcpy(dest, base_path, len); | |
300 | dest[len] = '\0'; | |
301 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 302 | } |
3b0d4f61 FB |
303 | } |
304 | ||
dc5a1371 PB |
305 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
306 | { | |
307 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
308 | pstrcpy(dest, sz, bs->backing_file); | |
309 | } else { | |
310 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
311 | } | |
312 | } | |
313 | ||
5efa9d5a | 314 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 315 | { |
8c5873d6 SH |
316 | /* Block drivers without coroutine functions need emulation */ |
317 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
318 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
319 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
320 | ||
f8c35c1d SH |
321 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
322 | * the block driver lacks aio we need to emulate that too. | |
323 | */ | |
f9f05dc5 KW |
324 | if (!bdrv->bdrv_aio_readv) { |
325 | /* add AIO emulation layer */ | |
326 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
327 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 328 | } |
83f64091 | 329 | } |
b2e12bc6 | 330 | |
8a22f02a | 331 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 332 | } |
b338082b FB |
333 | |
334 | /* create a new block device (by default it is empty) */ | |
335 | BlockDriverState *bdrv_new(const char *device_name) | |
336 | { | |
1b7bdbc1 | 337 | BlockDriverState *bs; |
b338082b | 338 | |
7267c094 | 339 | bs = g_malloc0(sizeof(BlockDriverState)); |
e4654d2d | 340 | QLIST_INIT(&bs->dirty_bitmaps); |
b338082b | 341 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 342 | if (device_name[0] != '\0') { |
dc364f4c | 343 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
ea2384d3 | 344 | } |
28a7282a | 345 | bdrv_iostatus_disable(bs); |
d7d512f6 | 346 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 347 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
348 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
349 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 350 | bs->refcnt = 1; |
d7d512f6 | 351 | |
b338082b FB |
352 | return bs; |
353 | } | |
354 | ||
d7d512f6 PB |
355 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
356 | { | |
357 | notifier_list_add(&bs->close_notifiers, notify); | |
358 | } | |
359 | ||
ea2384d3 FB |
360 | BlockDriver *bdrv_find_format(const char *format_name) |
361 | { | |
362 | BlockDriver *drv1; | |
8a22f02a SH |
363 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
364 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 365 | return drv1; |
8a22f02a | 366 | } |
ea2384d3 FB |
367 | } |
368 | return NULL; | |
369 | } | |
370 | ||
b64ec4e4 | 371 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 372 | { |
b64ec4e4 FZ |
373 | static const char *whitelist_rw[] = { |
374 | CONFIG_BDRV_RW_WHITELIST | |
375 | }; | |
376 | static const char *whitelist_ro[] = { | |
377 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
378 | }; |
379 | const char **p; | |
380 | ||
b64ec4e4 | 381 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 382 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 383 | } |
eb852011 | 384 | |
b64ec4e4 | 385 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
386 | if (!strcmp(drv->format_name, *p)) { |
387 | return 1; | |
388 | } | |
389 | } | |
b64ec4e4 FZ |
390 | if (read_only) { |
391 | for (p = whitelist_ro; *p; p++) { | |
392 | if (!strcmp(drv->format_name, *p)) { | |
393 | return 1; | |
394 | } | |
395 | } | |
396 | } | |
eb852011 MA |
397 | return 0; |
398 | } | |
399 | ||
b64ec4e4 FZ |
400 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
401 | bool read_only) | |
eb852011 MA |
402 | { |
403 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 404 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
405 | } |
406 | ||
5b7e1542 ZYW |
407 | typedef struct CreateCo { |
408 | BlockDriver *drv; | |
409 | char *filename; | |
410 | QEMUOptionParameter *options; | |
411 | int ret; | |
cc84d90f | 412 | Error *err; |
5b7e1542 ZYW |
413 | } CreateCo; |
414 | ||
415 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
416 | { | |
cc84d90f HR |
417 | Error *local_err = NULL; |
418 | int ret; | |
419 | ||
5b7e1542 ZYW |
420 | CreateCo *cco = opaque; |
421 | assert(cco->drv); | |
422 | ||
cc84d90f | 423 | ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err); |
84d18f06 | 424 | if (local_err) { |
cc84d90f HR |
425 | error_propagate(&cco->err, local_err); |
426 | } | |
427 | cco->ret = ret; | |
5b7e1542 ZYW |
428 | } |
429 | ||
0e7e1989 | 430 | int bdrv_create(BlockDriver *drv, const char* filename, |
cc84d90f | 431 | QEMUOptionParameter *options, Error **errp) |
ea2384d3 | 432 | { |
5b7e1542 ZYW |
433 | int ret; |
434 | ||
435 | Coroutine *co; | |
436 | CreateCo cco = { | |
437 | .drv = drv, | |
438 | .filename = g_strdup(filename), | |
439 | .options = options, | |
440 | .ret = NOT_DONE, | |
cc84d90f | 441 | .err = NULL, |
5b7e1542 ZYW |
442 | }; |
443 | ||
444 | if (!drv->bdrv_create) { | |
cc84d90f | 445 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
446 | ret = -ENOTSUP; |
447 | goto out; | |
5b7e1542 ZYW |
448 | } |
449 | ||
450 | if (qemu_in_coroutine()) { | |
451 | /* Fast-path if already in coroutine context */ | |
452 | bdrv_create_co_entry(&cco); | |
453 | } else { | |
454 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
455 | qemu_coroutine_enter(co, &cco); | |
456 | while (cco.ret == NOT_DONE) { | |
457 | qemu_aio_wait(); | |
458 | } | |
459 | } | |
460 | ||
461 | ret = cco.ret; | |
cc84d90f | 462 | if (ret < 0) { |
84d18f06 | 463 | if (cco.err) { |
cc84d90f HR |
464 | error_propagate(errp, cco.err); |
465 | } else { | |
466 | error_setg_errno(errp, -ret, "Could not create image"); | |
467 | } | |
468 | } | |
0e7e1989 | 469 | |
80168bff LC |
470 | out: |
471 | g_free(cco.filename); | |
5b7e1542 | 472 | return ret; |
ea2384d3 FB |
473 | } |
474 | ||
cc84d90f HR |
475 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options, |
476 | Error **errp) | |
84a12e66 CH |
477 | { |
478 | BlockDriver *drv; | |
cc84d90f HR |
479 | Error *local_err = NULL; |
480 | int ret; | |
84a12e66 | 481 | |
98289620 | 482 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 483 | if (drv == NULL) { |
cc84d90f | 484 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 485 | return -ENOENT; |
84a12e66 CH |
486 | } |
487 | ||
cc84d90f | 488 | ret = bdrv_create(drv, filename, options, &local_err); |
84d18f06 | 489 | if (local_err) { |
cc84d90f HR |
490 | error_propagate(errp, local_err); |
491 | } | |
492 | return ret; | |
84a12e66 CH |
493 | } |
494 | ||
355ef4ac | 495 | int bdrv_refresh_limits(BlockDriverState *bs) |
d34682cd KW |
496 | { |
497 | BlockDriver *drv = bs->drv; | |
498 | ||
499 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
500 | ||
466ad822 KW |
501 | if (!drv) { |
502 | return 0; | |
503 | } | |
504 | ||
505 | /* Take some limits from the children as a default */ | |
506 | if (bs->file) { | |
507 | bdrv_refresh_limits(bs->file); | |
508 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; | |
339064d5 KW |
509 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
510 | } else { | |
511 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
512 | } |
513 | ||
514 | if (bs->backing_hd) { | |
515 | bdrv_refresh_limits(bs->backing_hd); | |
516 | bs->bl.opt_transfer_length = | |
517 | MAX(bs->bl.opt_transfer_length, | |
518 | bs->backing_hd->bl.opt_transfer_length); | |
339064d5 KW |
519 | bs->bl.opt_mem_alignment = |
520 | MAX(bs->bl.opt_mem_alignment, | |
521 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
522 | } |
523 | ||
524 | /* Then let the driver override it */ | |
525 | if (drv->bdrv_refresh_limits) { | |
d34682cd KW |
526 | return drv->bdrv_refresh_limits(bs); |
527 | } | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
eba25057 JM |
532 | /* |
533 | * Create a uniquely-named empty temporary file. | |
534 | * Return 0 upon success, otherwise a negative errno value. | |
535 | */ | |
536 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 537 | { |
eba25057 | 538 | #ifdef _WIN32 |
3b9f94e1 | 539 | char temp_dir[MAX_PATH]; |
eba25057 JM |
540 | /* GetTempFileName requires that its output buffer (4th param) |
541 | have length MAX_PATH or greater. */ | |
542 | assert(size >= MAX_PATH); | |
543 | return (GetTempPath(MAX_PATH, temp_dir) | |
544 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
545 | ? 0 : -GetLastError()); | |
d5249393 | 546 | #else |
67b915a5 | 547 | int fd; |
7ccfb2eb | 548 | const char *tmpdir; |
0badc1ee AJ |
549 | tmpdir = getenv("TMPDIR"); |
550 | if (!tmpdir) | |
551 | tmpdir = "/tmp"; | |
eba25057 JM |
552 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
553 | return -EOVERFLOW; | |
554 | } | |
ea2384d3 | 555 | fd = mkstemp(filename); |
fe235a06 DH |
556 | if (fd < 0) { |
557 | return -errno; | |
558 | } | |
559 | if (close(fd) != 0) { | |
560 | unlink(filename); | |
eba25057 JM |
561 | return -errno; |
562 | } | |
563 | return 0; | |
d5249393 | 564 | #endif |
eba25057 | 565 | } |
fc01f7e7 | 566 | |
84a12e66 CH |
567 | /* |
568 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
569 | * recognized as a host CDROM. | |
570 | */ | |
571 | static BlockDriver *find_hdev_driver(const char *filename) | |
572 | { | |
573 | int score_max = 0, score; | |
574 | BlockDriver *drv = NULL, *d; | |
575 | ||
576 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
577 | if (d->bdrv_probe_device) { | |
578 | score = d->bdrv_probe_device(filename); | |
579 | if (score > score_max) { | |
580 | score_max = score; | |
581 | drv = d; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | return drv; | |
587 | } | |
588 | ||
98289620 KW |
589 | BlockDriver *bdrv_find_protocol(const char *filename, |
590 | bool allow_protocol_prefix) | |
83f64091 FB |
591 | { |
592 | BlockDriver *drv1; | |
593 | char protocol[128]; | |
1cec71e3 | 594 | int len; |
83f64091 | 595 | const char *p; |
19cb3738 | 596 | |
66f82cee KW |
597 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
598 | ||
39508e7a CH |
599 | /* |
600 | * XXX(hch): we really should not let host device detection | |
601 | * override an explicit protocol specification, but moving this | |
602 | * later breaks access to device names with colons in them. | |
603 | * Thanks to the brain-dead persistent naming schemes on udev- | |
604 | * based Linux systems those actually are quite common. | |
605 | */ | |
606 | drv1 = find_hdev_driver(filename); | |
607 | if (drv1) { | |
608 | return drv1; | |
609 | } | |
610 | ||
98289620 | 611 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 612 | return bdrv_find_format("file"); |
84a12e66 | 613 | } |
98289620 | 614 | |
9e0b22f4 SH |
615 | p = strchr(filename, ':'); |
616 | assert(p != NULL); | |
1cec71e3 AL |
617 | len = p - filename; |
618 | if (len > sizeof(protocol) - 1) | |
619 | len = sizeof(protocol) - 1; | |
620 | memcpy(protocol, filename, len); | |
621 | protocol[len] = '\0'; | |
8a22f02a | 622 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 623 | if (drv1->protocol_name && |
8a22f02a | 624 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 625 | return drv1; |
8a22f02a | 626 | } |
83f64091 FB |
627 | } |
628 | return NULL; | |
629 | } | |
630 | ||
f500a6d3 | 631 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 632 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 633 | { |
f500a6d3 | 634 | int score, score_max; |
f3a5d3f8 CH |
635 | BlockDriver *drv1, *drv; |
636 | uint8_t buf[2048]; | |
f500a6d3 | 637 | int ret = 0; |
f8ea0b00 | 638 | |
08a00559 | 639 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 640 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
641 | drv = bdrv_find_format("raw"); |
642 | if (!drv) { | |
34b5d2c6 | 643 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
644 | ret = -ENOENT; |
645 | } | |
646 | *pdrv = drv; | |
647 | return ret; | |
1a396859 | 648 | } |
f8ea0b00 | 649 | |
83f64091 | 650 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 651 | if (ret < 0) { |
34b5d2c6 HR |
652 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
653 | "format"); | |
c98ac35d SW |
654 | *pdrv = NULL; |
655 | return ret; | |
83f64091 FB |
656 | } |
657 | ||
ea2384d3 | 658 | score_max = 0; |
84a12e66 | 659 | drv = NULL; |
8a22f02a | 660 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
661 | if (drv1->bdrv_probe) { |
662 | score = drv1->bdrv_probe(buf, ret, filename); | |
663 | if (score > score_max) { | |
664 | score_max = score; | |
665 | drv = drv1; | |
666 | } | |
0849bf08 | 667 | } |
fc01f7e7 | 668 | } |
c98ac35d | 669 | if (!drv) { |
34b5d2c6 HR |
670 | error_setg(errp, "Could not determine image format: No compatible " |
671 | "driver found"); | |
c98ac35d SW |
672 | ret = -ENOENT; |
673 | } | |
674 | *pdrv = drv; | |
675 | return ret; | |
ea2384d3 FB |
676 | } |
677 | ||
51762288 SH |
678 | /** |
679 | * Set the current 'total_sectors' value | |
680 | */ | |
681 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
682 | { | |
683 | BlockDriver *drv = bs->drv; | |
684 | ||
396759ad NB |
685 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
686 | if (bs->sg) | |
687 | return 0; | |
688 | ||
51762288 SH |
689 | /* query actual device if possible, otherwise just trust the hint */ |
690 | if (drv->bdrv_getlength) { | |
691 | int64_t length = drv->bdrv_getlength(bs); | |
692 | if (length < 0) { | |
693 | return length; | |
694 | } | |
7e382003 | 695 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
696 | } |
697 | ||
698 | bs->total_sectors = hint; | |
699 | return 0; | |
700 | } | |
701 | ||
9e8f1835 PB |
702 | /** |
703 | * Set open flags for a given discard mode | |
704 | * | |
705 | * Return 0 on success, -1 if the discard mode was invalid. | |
706 | */ | |
707 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
708 | { | |
709 | *flags &= ~BDRV_O_UNMAP; | |
710 | ||
711 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
712 | /* do nothing */ | |
713 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
714 | *flags |= BDRV_O_UNMAP; | |
715 | } else { | |
716 | return -1; | |
717 | } | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
c3993cdc SH |
722 | /** |
723 | * Set open flags for a given cache mode | |
724 | * | |
725 | * Return 0 on success, -1 if the cache mode was invalid. | |
726 | */ | |
727 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
728 | { | |
729 | *flags &= ~BDRV_O_CACHE_MASK; | |
730 | ||
731 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
732 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
733 | } else if (!strcmp(mode, "directsync")) { |
734 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
735 | } else if (!strcmp(mode, "writeback")) { |
736 | *flags |= BDRV_O_CACHE_WB; | |
737 | } else if (!strcmp(mode, "unsafe")) { | |
738 | *flags |= BDRV_O_CACHE_WB; | |
739 | *flags |= BDRV_O_NO_FLUSH; | |
740 | } else if (!strcmp(mode, "writethrough")) { | |
741 | /* this is the default */ | |
742 | } else { | |
743 | return -1; | |
744 | } | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
53fec9d3 SH |
749 | /** |
750 | * The copy-on-read flag is actually a reference count so multiple users may | |
751 | * use the feature without worrying about clobbering its previous state. | |
752 | * Copy-on-read stays enabled until all users have called to disable it. | |
753 | */ | |
754 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
755 | { | |
756 | bs->copy_on_read++; | |
757 | } | |
758 | ||
759 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
760 | { | |
761 | assert(bs->copy_on_read > 0); | |
762 | bs->copy_on_read--; | |
763 | } | |
764 | ||
7b272452 KW |
765 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
766 | { | |
767 | int open_flags = flags | BDRV_O_CACHE_WB; | |
768 | ||
769 | /* | |
770 | * Clear flags that are internal to the block layer before opening the | |
771 | * image. | |
772 | */ | |
773 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
774 | ||
775 | /* | |
776 | * Snapshots should be writable. | |
777 | */ | |
778 | if (bs->is_temporary) { | |
779 | open_flags |= BDRV_O_RDWR; | |
780 | } | |
781 | ||
782 | return open_flags; | |
783 | } | |
784 | ||
6913c0c2 BC |
785 | static int bdrv_assign_node_name(BlockDriverState *bs, |
786 | const char *node_name, | |
787 | Error **errp) | |
788 | { | |
789 | if (!node_name) { | |
790 | return 0; | |
791 | } | |
792 | ||
793 | /* empty string node name is invalid */ | |
794 | if (node_name[0] == '\0') { | |
795 | error_setg(errp, "Empty node name"); | |
796 | return -EINVAL; | |
797 | } | |
798 | ||
0c5e94ee BC |
799 | /* takes care of avoiding namespaces collisions */ |
800 | if (bdrv_find(node_name)) { | |
801 | error_setg(errp, "node-name=%s is conflicting with a device id", | |
802 | node_name); | |
803 | return -EINVAL; | |
804 | } | |
805 | ||
6913c0c2 BC |
806 | /* takes care of avoiding duplicates node names */ |
807 | if (bdrv_find_node(node_name)) { | |
808 | error_setg(errp, "Duplicate node name"); | |
809 | return -EINVAL; | |
810 | } | |
811 | ||
812 | /* copy node name into the bs and insert it into the graph list */ | |
813 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
814 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
815 | ||
816 | return 0; | |
817 | } | |
818 | ||
57915332 KW |
819 | /* |
820 | * Common part for opening disk images and files | |
b6ad491a KW |
821 | * |
822 | * Removes all processed options from *options. | |
57915332 | 823 | */ |
f500a6d3 | 824 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 825 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
826 | { |
827 | int ret, open_flags; | |
035fccdf | 828 | const char *filename; |
6913c0c2 | 829 | const char *node_name = NULL; |
34b5d2c6 | 830 | Error *local_err = NULL; |
57915332 KW |
831 | |
832 | assert(drv != NULL); | |
6405875c | 833 | assert(bs->file == NULL); |
707ff828 | 834 | assert(options != NULL && bs->options != options); |
57915332 | 835 | |
45673671 KW |
836 | if (file != NULL) { |
837 | filename = file->filename; | |
838 | } else { | |
839 | filename = qdict_get_try_str(options, "filename"); | |
840 | } | |
841 | ||
765003db KW |
842 | if (drv->bdrv_needs_filename && !filename) { |
843 | error_setg(errp, "The '%s' block driver requires a file name", | |
844 | drv->format_name); | |
845 | return -EINVAL; | |
846 | } | |
847 | ||
45673671 | 848 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 849 | |
6913c0c2 BC |
850 | node_name = qdict_get_try_str(options, "node-name"); |
851 | ret = bdrv_assign_node_name(bs, node_name, errp); | |
852 | if (ret < 0) { | |
853 | return ret; | |
854 | } | |
855 | qdict_del(options, "node-name"); | |
856 | ||
5d186eb0 KW |
857 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
858 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
859 | * and return immediately. */ | |
860 | if (file != NULL && drv->bdrv_file_open) { | |
861 | bdrv_swap(file, bs); | |
862 | return 0; | |
863 | } | |
864 | ||
57915332 | 865 | bs->open_flags = flags; |
1b7fd729 | 866 | bs->guest_block_size = 512; |
c25f53b0 | 867 | bs->request_alignment = 512; |
0d51b4de | 868 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
869 | open_flags = bdrv_open_flags(bs, flags); |
870 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
871 | ||
872 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
873 | error_setg(errp, |
874 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
875 | ? "Driver '%s' can only be used for read-only devices" | |
876 | : "Driver '%s' is not whitelisted", | |
877 | drv->format_name); | |
b64ec4e4 FZ |
878 | return -ENOTSUP; |
879 | } | |
57915332 | 880 | |
53fec9d3 | 881 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
882 | if (flags & BDRV_O_COPY_ON_READ) { |
883 | if (!bs->read_only) { | |
884 | bdrv_enable_copy_on_read(bs); | |
885 | } else { | |
886 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
887 | return -EINVAL; | |
888 | } | |
53fec9d3 SH |
889 | } |
890 | ||
c2ad1b0c KW |
891 | if (filename != NULL) { |
892 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
893 | } else { | |
894 | bs->filename[0] = '\0'; | |
895 | } | |
57915332 | 896 | |
57915332 | 897 | bs->drv = drv; |
7267c094 | 898 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 899 | |
03f541bd | 900 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 901 | |
66f82cee KW |
902 | /* Open the image, either directly or using a protocol */ |
903 | if (drv->bdrv_file_open) { | |
5d186eb0 | 904 | assert(file == NULL); |
030be321 | 905 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 906 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 907 | } else { |
2af5ef70 | 908 | if (file == NULL) { |
34b5d2c6 HR |
909 | error_setg(errp, "Can't use '%s' as a block driver for the " |
910 | "protocol level", drv->format_name); | |
2af5ef70 KW |
911 | ret = -EINVAL; |
912 | goto free_and_fail; | |
913 | } | |
f500a6d3 | 914 | bs->file = file; |
34b5d2c6 | 915 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
916 | } |
917 | ||
57915332 | 918 | if (ret < 0) { |
84d18f06 | 919 | if (local_err) { |
34b5d2c6 | 920 | error_propagate(errp, local_err); |
2fa9aa59 DH |
921 | } else if (bs->filename[0]) { |
922 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
923 | } else { |
924 | error_setg_errno(errp, -ret, "Could not open image"); | |
925 | } | |
57915332 KW |
926 | goto free_and_fail; |
927 | } | |
928 | ||
51762288 SH |
929 | ret = refresh_total_sectors(bs, bs->total_sectors); |
930 | if (ret < 0) { | |
34b5d2c6 | 931 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 932 | goto free_and_fail; |
57915332 | 933 | } |
51762288 | 934 | |
d34682cd | 935 | bdrv_refresh_limits(bs); |
c25f53b0 PB |
936 | assert(bdrv_opt_mem_align(bs) != 0); |
937 | assert(bs->request_alignment != 0); | |
d34682cd | 938 | |
57915332 KW |
939 | #ifndef _WIN32 |
940 | if (bs->is_temporary) { | |
d4cea8df DH |
941 | assert(bs->filename[0] != '\0'); |
942 | unlink(bs->filename); | |
57915332 KW |
943 | } |
944 | #endif | |
945 | return 0; | |
946 | ||
947 | free_and_fail: | |
f500a6d3 | 948 | bs->file = NULL; |
7267c094 | 949 | g_free(bs->opaque); |
57915332 KW |
950 | bs->opaque = NULL; |
951 | bs->drv = NULL; | |
952 | return ret; | |
953 | } | |
954 | ||
b6ce07aa KW |
955 | /* |
956 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
957 | * |
958 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
959 | * empty set of options. The reference to the QDict belongs to the block layer | |
960 | * after the call (even on failure), so if the caller intends to reuse the | |
961 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 962 | */ |
2e40134b | 963 | static int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
5d12aa63 | 964 | QDict *options, int flags, Error **errp) |
ea2384d3 | 965 | { |
72daa72e | 966 | BlockDriverState *bs = NULL; |
6db95603 | 967 | BlockDriver *drv; |
c2ad1b0c | 968 | const char *drvname; |
98289620 | 969 | bool allow_protocol_prefix = false; |
34b5d2c6 | 970 | Error *local_err = NULL; |
83f64091 FB |
971 | int ret; |
972 | ||
707ff828 KW |
973 | /* NULL means an empty set of options */ |
974 | if (options == NULL) { | |
975 | options = qdict_new(); | |
976 | } | |
977 | ||
83f64091 | 978 | bs = bdrv_new(""); |
707ff828 KW |
979 | bs->options = options; |
980 | options = qdict_clone_shallow(options); | |
981 | ||
035fccdf KW |
982 | /* Fetch the file name from the options QDict if necessary */ |
983 | if (!filename) { | |
984 | filename = qdict_get_try_str(options, "filename"); | |
985 | } else if (filename && !qdict_haskey(options, "filename")) { | |
986 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 987 | allow_protocol_prefix = true; |
035fccdf | 988 | } else { |
34b5d2c6 HR |
989 | error_setg(errp, "Can't specify 'file' and 'filename' options at the " |
990 | "same time"); | |
035fccdf KW |
991 | ret = -EINVAL; |
992 | goto fail; | |
993 | } | |
994 | ||
c2ad1b0c KW |
995 | /* Find the right block driver */ |
996 | drvname = qdict_get_try_str(options, "driver"); | |
997 | if (drvname) { | |
8f94a6e4 | 998 | drv = bdrv_find_format(drvname); |
34b5d2c6 HR |
999 | if (!drv) { |
1000 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1001 | } | |
c2ad1b0c KW |
1002 | qdict_del(options, "driver"); |
1003 | } else if (filename) { | |
98289620 KW |
1004 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
1005 | if (!drv) { | |
34b5d2c6 | 1006 | error_setg(errp, "Unknown protocol"); |
98289620 | 1007 | } |
c2ad1b0c | 1008 | } else { |
34b5d2c6 | 1009 | error_setg(errp, "Must specify either driver or file"); |
c2ad1b0c KW |
1010 | drv = NULL; |
1011 | } | |
1012 | ||
1013 | if (!drv) { | |
34b5d2c6 | 1014 | /* errp has been set already */ |
c2ad1b0c KW |
1015 | ret = -ENOENT; |
1016 | goto fail; | |
1017 | } | |
1018 | ||
1019 | /* Parse the filename and open it */ | |
1020 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d | 1021 | drv->bdrv_parse_filename(filename, options, &local_err); |
84d18f06 | 1022 | if (local_err) { |
34b5d2c6 | 1023 | error_propagate(errp, local_err); |
6963a30d KW |
1024 | ret = -EINVAL; |
1025 | goto fail; | |
1026 | } | |
56d1b4d2 | 1027 | qdict_del(options, "filename"); |
6963a30d KW |
1028 | } |
1029 | ||
505d7583 | 1030 | if (!drv->bdrv_file_open) { |
ddf5636d | 1031 | ret = bdrv_open(&bs, filename, NULL, options, flags, drv, &local_err); |
505d7583 HR |
1032 | options = NULL; |
1033 | } else { | |
1034 | ret = bdrv_open_common(bs, NULL, options, flags, drv, &local_err); | |
1035 | } | |
83f64091 | 1036 | if (ret < 0) { |
34b5d2c6 | 1037 | error_propagate(errp, local_err); |
707ff828 KW |
1038 | goto fail; |
1039 | } | |
1040 | ||
1041 | /* Check if any unknown options were used */ | |
505d7583 | 1042 | if (options && (qdict_size(options) != 0)) { |
707ff828 | 1043 | const QDictEntry *entry = qdict_first(options); |
34b5d2c6 HR |
1044 | error_setg(errp, "Block protocol '%s' doesn't support the option '%s'", |
1045 | drv->format_name, entry->key); | |
707ff828 KW |
1046 | ret = -EINVAL; |
1047 | goto fail; | |
3b0d4f61 | 1048 | } |
707ff828 KW |
1049 | QDECREF(options); |
1050 | ||
71d0770c | 1051 | bs->growable = 1; |
83f64091 FB |
1052 | *pbs = bs; |
1053 | return 0; | |
707ff828 KW |
1054 | |
1055 | fail: | |
1056 | QDECREF(options); | |
1057 | if (!bs->drv) { | |
1058 | QDECREF(bs->options); | |
1059 | } | |
4f6fd349 | 1060 | bdrv_unref(bs); |
707ff828 | 1061 | return ret; |
83f64091 FB |
1062 | } |
1063 | ||
31ca6d07 KW |
1064 | /* |
1065 | * Opens the backing file for a BlockDriverState if not yet open | |
1066 | * | |
1067 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1068 | * empty set of options. The reference to the QDict is transferred to this | |
1069 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1070 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1071 | */ | |
34b5d2c6 | 1072 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 PB |
1073 | { |
1074 | char backing_filename[PATH_MAX]; | |
1075 | int back_flags, ret; | |
1076 | BlockDriver *back_drv = NULL; | |
34b5d2c6 | 1077 | Error *local_err = NULL; |
9156df12 PB |
1078 | |
1079 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1080 | QDECREF(options); |
9156df12 PB |
1081 | return 0; |
1082 | } | |
1083 | ||
31ca6d07 KW |
1084 | /* NULL means an empty set of options */ |
1085 | if (options == NULL) { | |
1086 | options = qdict_new(); | |
1087 | } | |
1088 | ||
9156df12 | 1089 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1090 | if (qdict_haskey(options, "file.filename")) { |
1091 | backing_filename[0] = '\0'; | |
1092 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1093 | QDECREF(options); |
9156df12 | 1094 | return 0; |
dbecebdd FZ |
1095 | } else { |
1096 | bdrv_get_full_backing_filename(bs, backing_filename, | |
1097 | sizeof(backing_filename)); | |
9156df12 PB |
1098 | } |
1099 | ||
9156df12 PB |
1100 | if (bs->backing_format[0] != '\0') { |
1101 | back_drv = bdrv_find_format(bs->backing_format); | |
1102 | } | |
1103 | ||
1104 | /* backing files always opened read-only */ | |
87a5debd TL |
1105 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | |
1106 | BDRV_O_COPY_ON_READ); | |
9156df12 | 1107 | |
f67503e5 HR |
1108 | assert(bs->backing_hd == NULL); |
1109 | ret = bdrv_open(&bs->backing_hd, | |
ddf5636d | 1110 | *backing_filename ? backing_filename : NULL, NULL, options, |
34b5d2c6 | 1111 | back_flags, back_drv, &local_err); |
9156df12 | 1112 | if (ret < 0) { |
9156df12 PB |
1113 | bs->backing_hd = NULL; |
1114 | bs->open_flags |= BDRV_O_NO_BACKING; | |
b04b6b6e FZ |
1115 | error_setg(errp, "Could not open backing file: %s", |
1116 | error_get_pretty(local_err)); | |
1117 | error_free(local_err); | |
9156df12 PB |
1118 | return ret; |
1119 | } | |
d80ac658 PF |
1120 | |
1121 | if (bs->backing_hd->file) { | |
1122 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), | |
1123 | bs->backing_hd->file->filename); | |
1124 | } | |
1125 | ||
d34682cd KW |
1126 | /* Recalculate the BlockLimits with the backing file */ |
1127 | bdrv_refresh_limits(bs); | |
1128 | ||
9156df12 PB |
1129 | return 0; |
1130 | } | |
1131 | ||
da557aac HR |
1132 | /* |
1133 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1134 | * device's options. | |
1135 | * | |
1136 | * If force_raw is true, bdrv_file_open() will be used, thereby preventing any | |
1137 | * image format auto-detection. If it is false and a filename is given, | |
1138 | * bdrv_open() will be used for auto-detection. | |
1139 | * | |
1140 | * If allow_none is true, no image will be opened if filename is false and no | |
1141 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1142 | * | |
1143 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1144 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1145 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1146 | * BlockdevRef. | |
1147 | * | |
1148 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1149 | * |
1150 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1151 | */ |
1152 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1153 | QDict *options, const char *bdref_key, int flags, | |
1154 | bool force_raw, bool allow_none, Error **errp) | |
1155 | { | |
1156 | QDict *image_options; | |
1157 | int ret; | |
1158 | char *bdref_key_dot; | |
1159 | const char *reference; | |
1160 | ||
f67503e5 HR |
1161 | assert(pbs); |
1162 | assert(*pbs == NULL); | |
1163 | ||
da557aac HR |
1164 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1165 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1166 | g_free(bdref_key_dot); | |
1167 | ||
1168 | reference = qdict_get_try_str(options, bdref_key); | |
1169 | if (!filename && !reference && !qdict_size(image_options)) { | |
1170 | if (allow_none) { | |
1171 | ret = 0; | |
1172 | } else { | |
1173 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1174 | bdref_key); | |
1175 | ret = -EINVAL; | |
1176 | } | |
1177 | goto done; | |
1178 | } | |
1179 | ||
1180 | if (filename && !force_raw) { | |
1181 | /* If a filename is given and the block driver should be detected | |
1182 | automatically (instead of using none), use bdrv_open() in order to do | |
1183 | that auto-detection. */ | |
da557aac HR |
1184 | if (reference) { |
1185 | error_setg(errp, "Cannot reference an existing block device while " | |
1186 | "giving a filename"); | |
1187 | ret = -EINVAL; | |
1188 | goto done; | |
1189 | } | |
1190 | ||
ddf5636d | 1191 | ret = bdrv_open(pbs, filename, NULL, image_options, flags, NULL, errp); |
da557aac | 1192 | } else { |
2e40134b HR |
1193 | ret = bdrv_open(pbs, filename, reference, image_options, |
1194 | flags | BDRV_O_PROTOCOL, NULL, errp); | |
da557aac HR |
1195 | } |
1196 | ||
1197 | done: | |
1198 | qdict_del(options, bdref_key); | |
1199 | return ret; | |
1200 | } | |
1201 | ||
b6ce07aa KW |
1202 | /* |
1203 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1204 | * |
1205 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1206 | * empty set of options. The reference to the QDict belongs to the block layer | |
1207 | * after the call (even on failure), so if the caller intends to reuse the | |
1208 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1209 | * |
1210 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1211 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1212 | * |
1213 | * The reference parameter may be used to specify an existing block device which | |
1214 | * should be opened. If specified, neither options nor a filename may be given, | |
1215 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1216 | */ |
ddf5636d HR |
1217 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1218 | const char *reference, QDict *options, int flags, | |
1219 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1220 | { |
b6ce07aa | 1221 | int ret; |
89c9bc3d SW |
1222 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
1223 | char tmp_filename[PATH_MAX + 1]; | |
f67503e5 | 1224 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1225 | const char *drvname; |
34b5d2c6 | 1226 | Error *local_err = NULL; |
712e7874 | 1227 | |
f67503e5 HR |
1228 | assert(pbs); |
1229 | ||
ddf5636d HR |
1230 | if (reference) { |
1231 | bool options_non_empty = options ? qdict_size(options) : false; | |
1232 | QDECREF(options); | |
1233 | ||
1234 | if (*pbs) { | |
1235 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1236 | "another block device"); | |
1237 | return -EINVAL; | |
1238 | } | |
1239 | ||
1240 | if (filename || options_non_empty) { | |
1241 | error_setg(errp, "Cannot reference an existing block device with " | |
1242 | "additional options or a new filename"); | |
1243 | return -EINVAL; | |
1244 | } | |
1245 | ||
1246 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1247 | if (!bs) { | |
1248 | return -ENODEV; | |
1249 | } | |
1250 | bdrv_ref(bs); | |
1251 | *pbs = bs; | |
1252 | return 0; | |
1253 | } | |
1254 | ||
5d12aa63 HR |
1255 | if (flags & BDRV_O_PROTOCOL) { |
1256 | assert(!drv); | |
1257 | return bdrv_file_open(pbs, filename, options, flags & ~BDRV_O_PROTOCOL, | |
1258 | errp); | |
1259 | } | |
1260 | ||
f67503e5 HR |
1261 | if (*pbs) { |
1262 | bs = *pbs; | |
1263 | } else { | |
1264 | bs = bdrv_new(""); | |
1265 | } | |
1266 | ||
de9c0cec KW |
1267 | /* NULL means an empty set of options */ |
1268 | if (options == NULL) { | |
1269 | options = qdict_new(); | |
1270 | } | |
1271 | ||
1272 | bs->options = options; | |
b6ad491a | 1273 | options = qdict_clone_shallow(options); |
de9c0cec KW |
1274 | |
1275 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 1276 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
1277 | BlockDriverState *bs1; |
1278 | int64_t total_size; | |
91a073a9 | 1279 | BlockDriver *bdrv_qcow2; |
08b392e1 | 1280 | QEMUOptionParameter *create_options; |
9fd3171a | 1281 | QDict *snapshot_options; |
c2ad1b0c | 1282 | |
ea2384d3 FB |
1283 | /* if snapshot, we create a temporary backing file and open it |
1284 | instead of opening 'filename' directly */ | |
33e3963e | 1285 | |
9fd3171a | 1286 | /* Get the required size from the image */ |
9fd3171a | 1287 | QINCREF(options); |
f67503e5 | 1288 | bs1 = NULL; |
ddf5636d | 1289 | ret = bdrv_open(&bs1, filename, NULL, options, BDRV_O_NO_BACKING, |
c9fbb99d | 1290 | drv, &local_err); |
51d7c00c | 1291 | if (ret < 0) { |
de9c0cec | 1292 | goto fail; |
ea2384d3 | 1293 | } |
3e82990b | 1294 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1295 | |
4f6fd349 | 1296 | bdrv_unref(bs1); |
3b46e624 | 1297 | |
9fd3171a | 1298 | /* Create the temporary image */ |
eba25057 JM |
1299 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1300 | if (ret < 0) { | |
34b5d2c6 | 1301 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
de9c0cec | 1302 | goto fail; |
eba25057 | 1303 | } |
7c96d46e | 1304 | |
91a073a9 | 1305 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1306 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1307 | NULL); | |
91a073a9 | 1308 | |
08b392e1 | 1309 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
91a073a9 | 1310 | |
cc84d90f | 1311 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err); |
08b392e1 | 1312 | free_option_parameters(create_options); |
51d7c00c | 1313 | if (ret < 0) { |
34b5d2c6 | 1314 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
cc84d90f HR |
1315 | "'%s': %s", tmp_filename, |
1316 | error_get_pretty(local_err)); | |
1317 | error_free(local_err); | |
1318 | local_err = NULL; | |
de9c0cec | 1319 | goto fail; |
ea2384d3 | 1320 | } |
91a073a9 | 1321 | |
9fd3171a KW |
1322 | /* Prepare a new options QDict for the temporary file, where user |
1323 | * options refer to the backing file */ | |
1324 | if (filename) { | |
1325 | qdict_put(options, "file.filename", qstring_from_str(filename)); | |
1326 | } | |
1327 | if (drv) { | |
1328 | qdict_put(options, "driver", qstring_from_str(drv->format_name)); | |
1329 | } | |
1330 | ||
1331 | snapshot_options = qdict_new(); | |
1332 | qdict_put(snapshot_options, "backing", options); | |
1333 | qdict_flatten(snapshot_options); | |
1334 | ||
1335 | bs->options = snapshot_options; | |
1336 | options = qdict_clone_shallow(bs->options); | |
1337 | ||
ea2384d3 | 1338 | filename = tmp_filename; |
91a073a9 | 1339 | drv = bdrv_qcow2; |
ea2384d3 FB |
1340 | bs->is_temporary = 1; |
1341 | } | |
712e7874 | 1342 | |
f500a6d3 KW |
1343 | /* Open image file without format layer */ |
1344 | if (flags & BDRV_O_RDWR) { | |
1345 | flags |= BDRV_O_ALLOW_RDWR; | |
1346 | } | |
1347 | ||
f67503e5 | 1348 | assert(file == NULL); |
054963f8 HR |
1349 | ret = bdrv_open_image(&file, filename, options, "file", |
1350 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP), true, true, | |
1351 | &local_err); | |
1352 | if (ret < 0) { | |
1353 | goto fail; | |
f500a6d3 KW |
1354 | } |
1355 | ||
b6ce07aa | 1356 | /* Find the right image format driver */ |
74fe54f2 KW |
1357 | drvname = qdict_get_try_str(options, "driver"); |
1358 | if (drvname) { | |
8f94a6e4 | 1359 | drv = bdrv_find_format(drvname); |
74fe54f2 | 1360 | qdict_del(options, "driver"); |
06d22aa3 KW |
1361 | if (!drv) { |
1362 | error_setg(errp, "Invalid driver: '%s'", drvname); | |
1363 | ret = -EINVAL; | |
1364 | goto unlink_and_fail; | |
1365 | } | |
74fe54f2 KW |
1366 | } |
1367 | ||
6db95603 | 1368 | if (!drv) { |
2a05cbe4 HR |
1369 | if (file) { |
1370 | ret = find_image_format(file, filename, &drv, &local_err); | |
1371 | } else { | |
1372 | error_setg(errp, "Must specify either driver or file"); | |
1373 | ret = -EINVAL; | |
1374 | goto unlink_and_fail; | |
1375 | } | |
51d7c00c | 1376 | } |
6987307c | 1377 | |
51d7c00c | 1378 | if (!drv) { |
51d7c00c | 1379 | goto unlink_and_fail; |
ea2384d3 | 1380 | } |
b6ce07aa KW |
1381 | |
1382 | /* Open the image */ | |
34b5d2c6 | 1383 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1384 | if (ret < 0) { |
6987307c CH |
1385 | goto unlink_and_fail; |
1386 | } | |
1387 | ||
2a05cbe4 | 1388 | if (file && (bs->file != file)) { |
4f6fd349 | 1389 | bdrv_unref(file); |
f500a6d3 KW |
1390 | file = NULL; |
1391 | } | |
1392 | ||
b6ce07aa | 1393 | /* If there is a backing file, use it */ |
9156df12 | 1394 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1395 | QDict *backing_options; |
1396 | ||
5726d872 | 1397 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1398 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1399 | if (ret < 0) { |
b6ad491a | 1400 | goto close_and_fail; |
b6ce07aa | 1401 | } |
b6ce07aa KW |
1402 | } |
1403 | ||
b6ad491a KW |
1404 | /* Check if any unknown options were used */ |
1405 | if (qdict_size(options) != 0) { | |
1406 | const QDictEntry *entry = qdict_first(options); | |
34b5d2c6 HR |
1407 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
1408 | "support the option '%s'", drv->format_name, bs->device_name, | |
1409 | entry->key); | |
b6ad491a KW |
1410 | |
1411 | ret = -EINVAL; | |
1412 | goto close_and_fail; | |
1413 | } | |
1414 | QDECREF(options); | |
1415 | ||
b6ce07aa | 1416 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1417 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1418 | } |
1419 | ||
f67503e5 | 1420 | *pbs = bs; |
b6ce07aa KW |
1421 | return 0; |
1422 | ||
1423 | unlink_and_fail: | |
f500a6d3 | 1424 | if (file != NULL) { |
4f6fd349 | 1425 | bdrv_unref(file); |
f500a6d3 | 1426 | } |
b6ce07aa KW |
1427 | if (bs->is_temporary) { |
1428 | unlink(filename); | |
1429 | } | |
de9c0cec KW |
1430 | fail: |
1431 | QDECREF(bs->options); | |
b6ad491a | 1432 | QDECREF(options); |
de9c0cec | 1433 | bs->options = NULL; |
f67503e5 HR |
1434 | if (!*pbs) { |
1435 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1436 | needs to be freed now. Otherwise, it does not need to be closed, | |
1437 | since it has not really been opened yet. */ | |
1438 | bdrv_unref(bs); | |
1439 | } | |
84d18f06 | 1440 | if (local_err) { |
34b5d2c6 HR |
1441 | error_propagate(errp, local_err); |
1442 | } | |
b6ad491a | 1443 | return ret; |
de9c0cec | 1444 | |
b6ad491a | 1445 | close_and_fail: |
f67503e5 HR |
1446 | /* See fail path, but now the BDS has to be always closed */ |
1447 | if (*pbs) { | |
1448 | bdrv_close(bs); | |
1449 | } else { | |
1450 | bdrv_unref(bs); | |
1451 | } | |
b6ad491a | 1452 | QDECREF(options); |
84d18f06 | 1453 | if (local_err) { |
34b5d2c6 HR |
1454 | error_propagate(errp, local_err); |
1455 | } | |
b6ce07aa KW |
1456 | return ret; |
1457 | } | |
1458 | ||
e971aa12 JC |
1459 | typedef struct BlockReopenQueueEntry { |
1460 | bool prepared; | |
1461 | BDRVReopenState state; | |
1462 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1463 | } BlockReopenQueueEntry; | |
1464 | ||
1465 | /* | |
1466 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1467 | * reopen of multiple devices. | |
1468 | * | |
1469 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1470 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1471 | * be created and initialized. This newly created BlockReopenQueue should be | |
1472 | * passed back in for subsequent calls that are intended to be of the same | |
1473 | * atomic 'set'. | |
1474 | * | |
1475 | * bs is the BlockDriverState to add to the reopen queue. | |
1476 | * | |
1477 | * flags contains the open flags for the associated bs | |
1478 | * | |
1479 | * returns a pointer to bs_queue, which is either the newly allocated | |
1480 | * bs_queue, or the existing bs_queue being used. | |
1481 | * | |
1482 | */ | |
1483 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1484 | BlockDriverState *bs, int flags) | |
1485 | { | |
1486 | assert(bs != NULL); | |
1487 | ||
1488 | BlockReopenQueueEntry *bs_entry; | |
1489 | if (bs_queue == NULL) { | |
1490 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1491 | QSIMPLEQ_INIT(bs_queue); | |
1492 | } | |
1493 | ||
1494 | if (bs->file) { | |
1495 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1496 | } | |
1497 | ||
1498 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1499 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1500 | ||
1501 | bs_entry->state.bs = bs; | |
1502 | bs_entry->state.flags = flags; | |
1503 | ||
1504 | return bs_queue; | |
1505 | } | |
1506 | ||
1507 | /* | |
1508 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1509 | * | |
1510 | * The queue passed in (bs_queue) must have been built up previous | |
1511 | * via bdrv_reopen_queue(). | |
1512 | * | |
1513 | * Reopens all BDS specified in the queue, with the appropriate | |
1514 | * flags. All devices are prepared for reopen, and failure of any | |
1515 | * device will cause all device changes to be abandonded, and intermediate | |
1516 | * data cleaned up. | |
1517 | * | |
1518 | * If all devices prepare successfully, then the changes are committed | |
1519 | * to all devices. | |
1520 | * | |
1521 | */ | |
1522 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1523 | { | |
1524 | int ret = -1; | |
1525 | BlockReopenQueueEntry *bs_entry, *next; | |
1526 | Error *local_err = NULL; | |
1527 | ||
1528 | assert(bs_queue != NULL); | |
1529 | ||
1530 | bdrv_drain_all(); | |
1531 | ||
1532 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1533 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1534 | error_propagate(errp, local_err); | |
1535 | goto cleanup; | |
1536 | } | |
1537 | bs_entry->prepared = true; | |
1538 | } | |
1539 | ||
1540 | /* If we reach this point, we have success and just need to apply the | |
1541 | * changes | |
1542 | */ | |
1543 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1544 | bdrv_reopen_commit(&bs_entry->state); | |
1545 | } | |
1546 | ||
1547 | ret = 0; | |
1548 | ||
1549 | cleanup: | |
1550 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1551 | if (ret && bs_entry->prepared) { | |
1552 | bdrv_reopen_abort(&bs_entry->state); | |
1553 | } | |
1554 | g_free(bs_entry); | |
1555 | } | |
1556 | g_free(bs_queue); | |
1557 | return ret; | |
1558 | } | |
1559 | ||
1560 | ||
1561 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1562 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1563 | { | |
1564 | int ret = -1; | |
1565 | Error *local_err = NULL; | |
1566 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1567 | ||
1568 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1569 | if (local_err != NULL) { | |
1570 | error_propagate(errp, local_err); | |
1571 | } | |
1572 | return ret; | |
1573 | } | |
1574 | ||
1575 | ||
1576 | /* | |
1577 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1578 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1579 | * the block driver layer .bdrv_reopen_prepare() | |
1580 | * | |
1581 | * bs is the BlockDriverState to reopen | |
1582 | * flags are the new open flags | |
1583 | * queue is the reopen queue | |
1584 | * | |
1585 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1586 | * as well. | |
1587 | * | |
1588 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1589 | * It is the responsibility of the caller to then call the abort() or | |
1590 | * commit() for any other BDS that have been left in a prepare() state | |
1591 | * | |
1592 | */ | |
1593 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1594 | Error **errp) | |
1595 | { | |
1596 | int ret = -1; | |
1597 | Error *local_err = NULL; | |
1598 | BlockDriver *drv; | |
1599 | ||
1600 | assert(reopen_state != NULL); | |
1601 | assert(reopen_state->bs->drv != NULL); | |
1602 | drv = reopen_state->bs->drv; | |
1603 | ||
1604 | /* if we are to stay read-only, do not allow permission change | |
1605 | * to r/w */ | |
1606 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1607 | reopen_state->flags & BDRV_O_RDWR) { | |
1608 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1609 | reopen_state->bs->device_name); | |
1610 | goto error; | |
1611 | } | |
1612 | ||
1613 | ||
1614 | ret = bdrv_flush(reopen_state->bs); | |
1615 | if (ret) { | |
1616 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1617 | strerror(-ret)); | |
1618 | goto error; | |
1619 | } | |
1620 | ||
1621 | if (drv->bdrv_reopen_prepare) { | |
1622 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1623 | if (ret) { | |
1624 | if (local_err != NULL) { | |
1625 | error_propagate(errp, local_err); | |
1626 | } else { | |
d8b6895f LC |
1627 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1628 | reopen_state->bs->filename); | |
e971aa12 JC |
1629 | } |
1630 | goto error; | |
1631 | } | |
1632 | } else { | |
1633 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1634 | * handler for each supported drv. */ | |
1635 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1636 | drv->format_name, reopen_state->bs->device_name, | |
1637 | "reopening of file"); | |
1638 | ret = -1; | |
1639 | goto error; | |
1640 | } | |
1641 | ||
1642 | ret = 0; | |
1643 | ||
1644 | error: | |
1645 | return ret; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1650 | * makes them final by swapping the staging BlockDriverState contents into | |
1651 | * the active BlockDriverState contents. | |
1652 | */ | |
1653 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1654 | { | |
1655 | BlockDriver *drv; | |
1656 | ||
1657 | assert(reopen_state != NULL); | |
1658 | drv = reopen_state->bs->drv; | |
1659 | assert(drv != NULL); | |
1660 | ||
1661 | /* If there are any driver level actions to take */ | |
1662 | if (drv->bdrv_reopen_commit) { | |
1663 | drv->bdrv_reopen_commit(reopen_state); | |
1664 | } | |
1665 | ||
1666 | /* set BDS specific flags now */ | |
1667 | reopen_state->bs->open_flags = reopen_state->flags; | |
1668 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1669 | BDRV_O_CACHE_WB); | |
1670 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac KW |
1671 | |
1672 | bdrv_refresh_limits(reopen_state->bs); | |
e971aa12 JC |
1673 | } |
1674 | ||
1675 | /* | |
1676 | * Abort the reopen, and delete and free the staged changes in | |
1677 | * reopen_state | |
1678 | */ | |
1679 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1680 | { | |
1681 | BlockDriver *drv; | |
1682 | ||
1683 | assert(reopen_state != NULL); | |
1684 | drv = reopen_state->bs->drv; | |
1685 | assert(drv != NULL); | |
1686 | ||
1687 | if (drv->bdrv_reopen_abort) { | |
1688 | drv->bdrv_reopen_abort(reopen_state); | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | ||
fc01f7e7 FB |
1693 | void bdrv_close(BlockDriverState *bs) |
1694 | { | |
3cbc002c PB |
1695 | if (bs->job) { |
1696 | block_job_cancel_sync(bs->job); | |
1697 | } | |
58fda173 SH |
1698 | bdrv_drain_all(); /* complete I/O */ |
1699 | bdrv_flush(bs); | |
1700 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1701 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1702 | |
3cbc002c | 1703 | if (bs->drv) { |
557df6ac | 1704 | if (bs->backing_hd) { |
4f6fd349 | 1705 | bdrv_unref(bs->backing_hd); |
557df6ac SH |
1706 | bs->backing_hd = NULL; |
1707 | } | |
ea2384d3 | 1708 | bs->drv->bdrv_close(bs); |
7267c094 | 1709 | g_free(bs->opaque); |
ea2384d3 FB |
1710 | #ifdef _WIN32 |
1711 | if (bs->is_temporary) { | |
1712 | unlink(bs->filename); | |
1713 | } | |
67b915a5 | 1714 | #endif |
ea2384d3 FB |
1715 | bs->opaque = NULL; |
1716 | bs->drv = NULL; | |
53fec9d3 | 1717 | bs->copy_on_read = 0; |
a275fa42 PB |
1718 | bs->backing_file[0] = '\0'; |
1719 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1720 | bs->total_sectors = 0; |
1721 | bs->encrypted = 0; | |
1722 | bs->valid_key = 0; | |
1723 | bs->sg = 0; | |
1724 | bs->growable = 0; | |
0d51b4de | 1725 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1726 | QDECREF(bs->options); |
1727 | bs->options = NULL; | |
b338082b | 1728 | |
66f82cee | 1729 | if (bs->file != NULL) { |
4f6fd349 | 1730 | bdrv_unref(bs->file); |
0ac9377d | 1731 | bs->file = NULL; |
66f82cee | 1732 | } |
b338082b | 1733 | } |
98f90dba | 1734 | |
9ca11154 PH |
1735 | bdrv_dev_change_media_cb(bs, false); |
1736 | ||
98f90dba ZYW |
1737 | /*throttling disk I/O limits*/ |
1738 | if (bs->io_limits_enabled) { | |
1739 | bdrv_io_limits_disable(bs); | |
1740 | } | |
b338082b FB |
1741 | } |
1742 | ||
2bc93fed MK |
1743 | void bdrv_close_all(void) |
1744 | { | |
1745 | BlockDriverState *bs; | |
1746 | ||
dc364f4c | 1747 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
2bc93fed MK |
1748 | bdrv_close(bs); |
1749 | } | |
1750 | } | |
1751 | ||
88266f5a SH |
1752 | /* Check if any requests are in-flight (including throttled requests) */ |
1753 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1754 | { | |
1755 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1756 | return true; | |
1757 | } | |
cc0681c4 BC |
1758 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1759 | return true; | |
1760 | } | |
1761 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1762 | return true; |
1763 | } | |
1764 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1765 | return true; | |
1766 | } | |
1767 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1768 | return true; | |
1769 | } | |
1770 | return false; | |
1771 | } | |
1772 | ||
1773 | static bool bdrv_requests_pending_all(void) | |
1774 | { | |
1775 | BlockDriverState *bs; | |
dc364f4c | 1776 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
88266f5a SH |
1777 | if (bdrv_requests_pending(bs)) { |
1778 | return true; | |
1779 | } | |
1780 | } | |
1781 | return false; | |
1782 | } | |
1783 | ||
922453bc SH |
1784 | /* |
1785 | * Wait for pending requests to complete across all BlockDriverStates | |
1786 | * | |
1787 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1788 | * after calling this function. | |
4c355d53 ZYW |
1789 | * |
1790 | * Note that completion of an asynchronous I/O operation can trigger any | |
1791 | * number of other I/O operations on other devices---for example a coroutine | |
1792 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1793 | * coroutine is complete. Because of this, it is not possible to have a | |
1794 | * function to drain a single device's I/O queue. | |
922453bc SH |
1795 | */ |
1796 | void bdrv_drain_all(void) | |
1797 | { | |
88266f5a SH |
1798 | /* Always run first iteration so any pending completion BHs run */ |
1799 | bool busy = true; | |
922453bc SH |
1800 | BlockDriverState *bs; |
1801 | ||
88266f5a | 1802 | while (busy) { |
dc364f4c | 1803 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
0b06ef3b | 1804 | bdrv_start_throttled_reqs(bs); |
4c355d53 | 1805 | } |
922453bc | 1806 | |
88266f5a SH |
1807 | busy = bdrv_requests_pending_all(); |
1808 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1809 | } |
1810 | } | |
1811 | ||
dc364f4c BC |
1812 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
1813 | * graph_bdrv_state list. | |
d22b2f41 RH |
1814 | Also, NULL terminate the device_name to prevent double remove */ |
1815 | void bdrv_make_anon(BlockDriverState *bs) | |
1816 | { | |
1817 | if (bs->device_name[0] != '\0') { | |
dc364f4c | 1818 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
d22b2f41 RH |
1819 | } |
1820 | bs->device_name[0] = '\0'; | |
dc364f4c BC |
1821 | if (bs->node_name[0] != '\0') { |
1822 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
1823 | } | |
1824 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
1825 | } |
1826 | ||
e023b2e2 PB |
1827 | static void bdrv_rebind(BlockDriverState *bs) |
1828 | { | |
1829 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1830 | bs->drv->bdrv_rebind(bs); | |
1831 | } | |
1832 | } | |
1833 | ||
4ddc07ca PB |
1834 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1835 | BlockDriverState *bs_src) | |
8802d1fd | 1836 | { |
4ddc07ca PB |
1837 | /* move some fields that need to stay attached to the device */ |
1838 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1839 | |
1840 | /* dev info */ | |
4ddc07ca PB |
1841 | bs_dest->dev_ops = bs_src->dev_ops; |
1842 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1843 | bs_dest->dev = bs_src->dev; | |
1b7fd729 | 1844 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 1845 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 1846 | |
4ddc07ca | 1847 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1848 | |
cc0681c4 BC |
1849 | /* i/o throttled req */ |
1850 | memcpy(&bs_dest->throttle_state, | |
1851 | &bs_src->throttle_state, | |
1852 | sizeof(ThrottleState)); | |
1853 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1854 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1855 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1856 | |
8802d1fd | 1857 | /* r/w error */ |
4ddc07ca PB |
1858 | bs_dest->on_read_error = bs_src->on_read_error; |
1859 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1860 | |
1861 | /* i/o status */ | |
4ddc07ca PB |
1862 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1863 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1864 | |
a9fc4408 | 1865 | /* dirty bitmap */ |
e4654d2d | 1866 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 1867 | |
9fcb0251 FZ |
1868 | /* reference count */ |
1869 | bs_dest->refcnt = bs_src->refcnt; | |
1870 | ||
a9fc4408 | 1871 | /* job */ |
4ddc07ca PB |
1872 | bs_dest->in_use = bs_src->in_use; |
1873 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1874 | |
8802d1fd | 1875 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1876 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1877 | bs_src->device_name); | |
dc364f4c BC |
1878 | bs_dest->device_list = bs_src->device_list; |
1879 | ||
1880 | /* keep the same entry in graph_bdrv_states | |
1881 | * We do want to swap name but don't want to swap linked list entries | |
1882 | */ | |
1883 | bs_dest->node_list = bs_src->node_list; | |
4ddc07ca | 1884 | } |
8802d1fd | 1885 | |
4ddc07ca PB |
1886 | /* |
1887 | * Swap bs contents for two image chains while they are live, | |
1888 | * while keeping required fields on the BlockDriverState that is | |
1889 | * actually attached to a device. | |
1890 | * | |
1891 | * This will modify the BlockDriverState fields, and swap contents | |
1892 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1893 | * | |
1894 | * bs_new is required to be anonymous. | |
1895 | * | |
1896 | * This function does not create any image files. | |
1897 | */ | |
1898 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1899 | { | |
1900 | BlockDriverState tmp; | |
f6801b83 | 1901 | |
4ddc07ca PB |
1902 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1903 | assert(bs_new->device_name[0] == '\0'); | |
e4654d2d | 1904 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
1905 | assert(bs_new->job == NULL); |
1906 | assert(bs_new->dev == NULL); | |
1907 | assert(bs_new->in_use == 0); | |
1908 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1909 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 1910 | |
4ddc07ca PB |
1911 | tmp = *bs_new; |
1912 | *bs_new = *bs_old; | |
1913 | *bs_old = tmp; | |
a9fc4408 | 1914 | |
4ddc07ca PB |
1915 | /* there are some fields that should not be swapped, move them back */ |
1916 | bdrv_move_feature_fields(&tmp, bs_old); | |
1917 | bdrv_move_feature_fields(bs_old, bs_new); | |
1918 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1919 | |
4ddc07ca PB |
1920 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1921 | assert(bs_new->device_name[0] == '\0'); | |
1922 | ||
1923 | /* Check a few fields that should remain attached to the device */ | |
1924 | assert(bs_new->dev == NULL); | |
1925 | assert(bs_new->job == NULL); | |
1926 | assert(bs_new->in_use == 0); | |
1927 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1928 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 PB |
1929 | |
1930 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1931 | bdrv_rebind(bs_old); |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Add new bs contents at the top of an image chain while the chain is | |
1936 | * live, while keeping required fields on the top layer. | |
1937 | * | |
1938 | * This will modify the BlockDriverState fields, and swap contents | |
1939 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1940 | * | |
1941 | * bs_new is required to be anonymous. | |
1942 | * | |
1943 | * This function does not create any image files. | |
1944 | */ | |
1945 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1946 | { | |
1947 | bdrv_swap(bs_new, bs_top); | |
1948 | ||
1949 | /* The contents of 'tmp' will become bs_top, as we are | |
1950 | * swapping bs_new and bs_top contents. */ | |
1951 | bs_top->backing_hd = bs_new; | |
1952 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1953 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1954 | bs_new->filename); | |
1955 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1956 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1957 | } |
1958 | ||
4f6fd349 | 1959 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 1960 | { |
fa879d62 | 1961 | assert(!bs->dev); |
3e914655 PB |
1962 | assert(!bs->job); |
1963 | assert(!bs->in_use); | |
4f6fd349 | 1964 | assert(!bs->refcnt); |
e4654d2d | 1965 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 1966 | |
e1b5c52e SH |
1967 | bdrv_close(bs); |
1968 | ||
1b7bdbc1 | 1969 | /* remove from list, if necessary */ |
d22b2f41 | 1970 | bdrv_make_anon(bs); |
34c6f050 | 1971 | |
7267c094 | 1972 | g_free(bs); |
fc01f7e7 FB |
1973 | } |
1974 | ||
fa879d62 MA |
1975 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1976 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1977 | { |
fa879d62 | 1978 | if (bs->dev) { |
18846dee MA |
1979 | return -EBUSY; |
1980 | } | |
fa879d62 | 1981 | bs->dev = dev; |
28a7282a | 1982 | bdrv_iostatus_reset(bs); |
18846dee MA |
1983 | return 0; |
1984 | } | |
1985 | ||
fa879d62 MA |
1986 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1987 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1988 | { |
fa879d62 MA |
1989 | if (bdrv_attach_dev(bs, dev) < 0) { |
1990 | abort(); | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1995 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1996 | { | |
1997 | assert(bs->dev == dev); | |
1998 | bs->dev = NULL; | |
0e49de52 MA |
1999 | bs->dev_ops = NULL; |
2000 | bs->dev_opaque = NULL; | |
1b7fd729 | 2001 | bs->guest_block_size = 512; |
18846dee MA |
2002 | } |
2003 | ||
fa879d62 MA |
2004 | /* TODO change to return DeviceState * when all users are qdevified */ |
2005 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 2006 | { |
fa879d62 | 2007 | return bs->dev; |
18846dee MA |
2008 | } |
2009 | ||
0e49de52 MA |
2010 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
2011 | void *opaque) | |
2012 | { | |
2013 | bs->dev_ops = ops; | |
2014 | bs->dev_opaque = opaque; | |
2015 | } | |
2016 | ||
32c81a4a PB |
2017 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
2018 | enum MonitorEvent ev, | |
2019 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
2020 | { |
2021 | QObject *data; | |
2022 | const char *action_str; | |
2023 | ||
2024 | switch (action) { | |
2025 | case BDRV_ACTION_REPORT: | |
2026 | action_str = "report"; | |
2027 | break; | |
2028 | case BDRV_ACTION_IGNORE: | |
2029 | action_str = "ignore"; | |
2030 | break; | |
2031 | case BDRV_ACTION_STOP: | |
2032 | action_str = "stop"; | |
2033 | break; | |
2034 | default: | |
2035 | abort(); | |
2036 | } | |
2037 | ||
2038 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
2039 | bdrv->device_name, | |
2040 | action_str, | |
2041 | is_read ? "read" : "write"); | |
32c81a4a | 2042 | monitor_protocol_event(ev, data); |
329c0a48 LC |
2043 | |
2044 | qobject_decref(data); | |
2045 | } | |
2046 | ||
6f382ed2 LC |
2047 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
2048 | { | |
2049 | QObject *data; | |
2050 | ||
2051 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
2052 | bdrv_get_device_name(bs), ejected); | |
2053 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
2054 | ||
2055 | qobject_decref(data); | |
2056 | } | |
2057 | ||
7d4b4ba5 | 2058 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 2059 | { |
145feb17 | 2060 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 2061 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 2062 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
2063 | if (tray_was_closed) { |
2064 | /* tray open */ | |
2065 | bdrv_emit_qmp_eject_event(bs, true); | |
2066 | } | |
2067 | if (load) { | |
2068 | /* tray close */ | |
2069 | bdrv_emit_qmp_eject_event(bs, false); | |
2070 | } | |
145feb17 MA |
2071 | } |
2072 | } | |
2073 | ||
2c6942fa MA |
2074 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
2075 | { | |
2076 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
2077 | } | |
2078 | ||
025ccaa7 PB |
2079 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
2080 | { | |
2081 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
2082 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
2083 | } | |
2084 | } | |
2085 | ||
e4def80b MA |
2086 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
2087 | { | |
2088 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
2089 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
2090 | } | |
2091 | return false; | |
2092 | } | |
2093 | ||
145feb17 MA |
2094 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
2095 | { | |
2096 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
2097 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
2098 | } |
2099 | } | |
2100 | ||
f107639a MA |
2101 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
2102 | { | |
2103 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
2104 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
2105 | } | |
2106 | return false; | |
2107 | } | |
2108 | ||
e97fc193 AL |
2109 | /* |
2110 | * Run consistency checks on an image | |
2111 | * | |
e076f338 | 2112 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2113 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2114 | * check are stored in res. |
e97fc193 | 2115 | */ |
4534ff54 | 2116 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
2117 | { |
2118 | if (bs->drv->bdrv_check == NULL) { | |
2119 | return -ENOTSUP; | |
2120 | } | |
2121 | ||
e076f338 | 2122 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2123 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2124 | } |
2125 | ||
8a426614 KW |
2126 | #define COMMIT_BUF_SECTORS 2048 |
2127 | ||
33e3963e FB |
2128 | /* commit COW file into the raw image */ |
2129 | int bdrv_commit(BlockDriverState *bs) | |
2130 | { | |
19cb3738 | 2131 | BlockDriver *drv = bs->drv; |
72706ea4 | 2132 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2133 | int n, ro, open_flags; |
0bce597d | 2134 | int ret = 0; |
72706ea4 | 2135 | uint8_t *buf = NULL; |
c2cba3d9 | 2136 | char filename[PATH_MAX]; |
33e3963e | 2137 | |
19cb3738 FB |
2138 | if (!drv) |
2139 | return -ENOMEDIUM; | |
4dca4b63 NS |
2140 | |
2141 | if (!bs->backing_hd) { | |
2142 | return -ENOTSUP; | |
33e3963e FB |
2143 | } |
2144 | ||
2d3735d3 SH |
2145 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
2146 | return -EBUSY; | |
2147 | } | |
2148 | ||
4dca4b63 | 2149 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2150 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2151 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2152 | open_flags = bs->backing_hd->open_flags; |
2153 | ||
2154 | if (ro) { | |
0bce597d JC |
2155 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2156 | return -EACCES; | |
4dca4b63 | 2157 | } |
ea2384d3 | 2158 | } |
33e3963e | 2159 | |
72706ea4 JC |
2160 | length = bdrv_getlength(bs); |
2161 | if (length < 0) { | |
2162 | ret = length; | |
2163 | goto ro_cleanup; | |
2164 | } | |
2165 | ||
2166 | backing_length = bdrv_getlength(bs->backing_hd); | |
2167 | if (backing_length < 0) { | |
2168 | ret = backing_length; | |
2169 | goto ro_cleanup; | |
2170 | } | |
2171 | ||
2172 | /* If our top snapshot is larger than the backing file image, | |
2173 | * grow the backing file image if possible. If not possible, | |
2174 | * we must return an error */ | |
2175 | if (length > backing_length) { | |
2176 | ret = bdrv_truncate(bs->backing_hd, length); | |
2177 | if (ret < 0) { | |
2178 | goto ro_cleanup; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | total_sectors = length >> BDRV_SECTOR_BITS; | |
7267c094 | 2183 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
2184 | |
2185 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2186 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2187 | if (ret < 0) { | |
2188 | goto ro_cleanup; | |
2189 | } | |
2190 | if (ret) { | |
dabfa6cc KW |
2191 | ret = bdrv_read(bs, sector, buf, n); |
2192 | if (ret < 0) { | |
8a426614 KW |
2193 | goto ro_cleanup; |
2194 | } | |
2195 | ||
dabfa6cc KW |
2196 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2197 | if (ret < 0) { | |
8a426614 KW |
2198 | goto ro_cleanup; |
2199 | } | |
ea2384d3 | 2200 | } |
33e3963e | 2201 | } |
95389c86 | 2202 | |
1d44952f CH |
2203 | if (drv->bdrv_make_empty) { |
2204 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2205 | if (ret < 0) { |
2206 | goto ro_cleanup; | |
2207 | } | |
1d44952f CH |
2208 | bdrv_flush(bs); |
2209 | } | |
95389c86 | 2210 | |
3f5075ae CH |
2211 | /* |
2212 | * Make sure all data we wrote to the backing device is actually | |
2213 | * stable on disk. | |
2214 | */ | |
dabfa6cc | 2215 | if (bs->backing_hd) { |
3f5075ae | 2216 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2217 | } |
4dca4b63 | 2218 | |
dabfa6cc | 2219 | ret = 0; |
4dca4b63 | 2220 | ro_cleanup: |
7267c094 | 2221 | g_free(buf); |
4dca4b63 NS |
2222 | |
2223 | if (ro) { | |
0bce597d JC |
2224 | /* ignoring error return here */ |
2225 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2226 | } |
2227 | ||
1d44952f | 2228 | return ret; |
33e3963e FB |
2229 | } |
2230 | ||
e8877497 | 2231 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2232 | { |
2233 | BlockDriverState *bs; | |
2234 | ||
dc364f4c | 2235 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
272d2d8e JC |
2236 | if (bs->drv && bs->backing_hd) { |
2237 | int ret = bdrv_commit(bs); | |
2238 | if (ret < 0) { | |
2239 | return ret; | |
2240 | } | |
e8877497 | 2241 | } |
6ab4b5ab | 2242 | } |
e8877497 | 2243 | return 0; |
6ab4b5ab MA |
2244 | } |
2245 | ||
dbffbdcf SH |
2246 | /** |
2247 | * Remove an active request from the tracked requests list | |
2248 | * | |
2249 | * This function should be called when a tracked request is completing. | |
2250 | */ | |
2251 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2252 | { | |
2dbafdc0 KW |
2253 | if (req->serialising) { |
2254 | req->bs->serialising_in_flight--; | |
2255 | } | |
2256 | ||
dbffbdcf | 2257 | QLIST_REMOVE(req, list); |
f4658285 | 2258 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2259 | } |
2260 | ||
2261 | /** | |
2262 | * Add an active request to the tracked requests list | |
2263 | */ | |
2264 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2265 | BlockDriverState *bs, | |
793ed47a KW |
2266 | int64_t offset, |
2267 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2268 | { |
2269 | *req = (BdrvTrackedRequest){ | |
2270 | .bs = bs, | |
2dbafdc0 KW |
2271 | .offset = offset, |
2272 | .bytes = bytes, | |
2273 | .is_write = is_write, | |
2274 | .co = qemu_coroutine_self(), | |
2275 | .serialising = false, | |
7327145f KW |
2276 | .overlap_offset = offset, |
2277 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2278 | }; |
2279 | ||
f4658285 SH |
2280 | qemu_co_queue_init(&req->wait_queue); |
2281 | ||
dbffbdcf SH |
2282 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2283 | } | |
2284 | ||
e96126ff | 2285 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2286 | { |
7327145f | 2287 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2288 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2289 | - overlap_offset; | |
7327145f | 2290 | |
2dbafdc0 KW |
2291 | if (!req->serialising) { |
2292 | req->bs->serialising_in_flight++; | |
2293 | req->serialising = true; | |
2294 | } | |
7327145f KW |
2295 | |
2296 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2297 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2298 | } |
2299 | ||
d83947ac SH |
2300 | /** |
2301 | * Round a region to cluster boundaries | |
2302 | */ | |
343bded4 PB |
2303 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2304 | int64_t sector_num, int nb_sectors, | |
2305 | int64_t *cluster_sector_num, | |
2306 | int *cluster_nb_sectors) | |
d83947ac SH |
2307 | { |
2308 | BlockDriverInfo bdi; | |
2309 | ||
2310 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2311 | *cluster_sector_num = sector_num; | |
2312 | *cluster_nb_sectors = nb_sectors; | |
2313 | } else { | |
2314 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2315 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2316 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2317 | nb_sectors, c); | |
2318 | } | |
2319 | } | |
2320 | ||
7327145f | 2321 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2322 | { |
2323 | BlockDriverInfo bdi; | |
7327145f | 2324 | int ret; |
793ed47a | 2325 | |
7327145f KW |
2326 | ret = bdrv_get_info(bs, &bdi); |
2327 | if (ret < 0 || bdi.cluster_size == 0) { | |
2328 | return bs->request_alignment; | |
793ed47a | 2329 | } else { |
7327145f | 2330 | return bdi.cluster_size; |
793ed47a KW |
2331 | } |
2332 | } | |
2333 | ||
f4658285 | 2334 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2335 | int64_t offset, unsigned int bytes) |
2336 | { | |
d83947ac | 2337 | /* aaaa bbbb */ |
7327145f | 2338 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2339 | return false; |
2340 | } | |
2341 | /* bbbb aaaa */ | |
7327145f | 2342 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2343 | return false; |
2344 | } | |
2345 | return true; | |
f4658285 SH |
2346 | } |
2347 | ||
28de2dcd | 2348 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2349 | { |
2dbafdc0 | 2350 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2351 | BdrvTrackedRequest *req; |
2352 | bool retry; | |
28de2dcd | 2353 | bool waited = false; |
f4658285 | 2354 | |
2dbafdc0 | 2355 | if (!bs->serialising_in_flight) { |
28de2dcd | 2356 | return false; |
2dbafdc0 KW |
2357 | } |
2358 | ||
f4658285 SH |
2359 | do { |
2360 | retry = false; | |
2361 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2362 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2363 | continue; |
2364 | } | |
7327145f KW |
2365 | if (tracked_request_overlaps(req, self->overlap_offset, |
2366 | self->overlap_bytes)) | |
2367 | { | |
5f8b6491 SH |
2368 | /* Hitting this means there was a reentrant request, for |
2369 | * example, a block driver issuing nested requests. This must | |
2370 | * never happen since it means deadlock. | |
2371 | */ | |
2372 | assert(qemu_coroutine_self() != req->co); | |
2373 | ||
6460440f KW |
2374 | /* If the request is already (indirectly) waiting for us, or |
2375 | * will wait for us as soon as it wakes up, then just go on | |
2376 | * (instead of producing a deadlock in the former case). */ | |
2377 | if (!req->waiting_for) { | |
2378 | self->waiting_for = req; | |
2379 | qemu_co_queue_wait(&req->wait_queue); | |
2380 | self->waiting_for = NULL; | |
2381 | retry = true; | |
28de2dcd | 2382 | waited = true; |
6460440f KW |
2383 | break; |
2384 | } | |
f4658285 SH |
2385 | } |
2386 | } | |
2387 | } while (retry); | |
28de2dcd KW |
2388 | |
2389 | return waited; | |
f4658285 SH |
2390 | } |
2391 | ||
756e6736 KW |
2392 | /* |
2393 | * Return values: | |
2394 | * 0 - success | |
2395 | * -EINVAL - backing format specified, but no file | |
2396 | * -ENOSPC - can't update the backing file because no space is left in the | |
2397 | * image file header | |
2398 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2399 | */ | |
2400 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2401 | const char *backing_file, const char *backing_fmt) | |
2402 | { | |
2403 | BlockDriver *drv = bs->drv; | |
469ef350 | 2404 | int ret; |
756e6736 | 2405 | |
5f377794 PB |
2406 | /* Backing file format doesn't make sense without a backing file */ |
2407 | if (backing_fmt && !backing_file) { | |
2408 | return -EINVAL; | |
2409 | } | |
2410 | ||
756e6736 | 2411 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2412 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2413 | } else { |
469ef350 | 2414 | ret = -ENOTSUP; |
756e6736 | 2415 | } |
469ef350 PB |
2416 | |
2417 | if (ret == 0) { | |
2418 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2419 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2420 | } | |
2421 | return ret; | |
756e6736 KW |
2422 | } |
2423 | ||
6ebdcee2 JC |
2424 | /* |
2425 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2426 | * | |
2427 | * active is the current topmost image. | |
2428 | * | |
2429 | * Returns NULL if bs is not found in active's image chain, | |
2430 | * or if active == bs. | |
2431 | */ | |
2432 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2433 | BlockDriverState *bs) | |
2434 | { | |
2435 | BlockDriverState *overlay = NULL; | |
2436 | BlockDriverState *intermediate; | |
2437 | ||
2438 | assert(active != NULL); | |
2439 | assert(bs != NULL); | |
2440 | ||
2441 | /* if bs is the same as active, then by definition it has no overlay | |
2442 | */ | |
2443 | if (active == bs) { | |
2444 | return NULL; | |
2445 | } | |
2446 | ||
2447 | intermediate = active; | |
2448 | while (intermediate->backing_hd) { | |
2449 | if (intermediate->backing_hd == bs) { | |
2450 | overlay = intermediate; | |
2451 | break; | |
2452 | } | |
2453 | intermediate = intermediate->backing_hd; | |
2454 | } | |
2455 | ||
2456 | return overlay; | |
2457 | } | |
2458 | ||
2459 | typedef struct BlkIntermediateStates { | |
2460 | BlockDriverState *bs; | |
2461 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2462 | } BlkIntermediateStates; | |
2463 | ||
2464 | ||
2465 | /* | |
2466 | * Drops images above 'base' up to and including 'top', and sets the image | |
2467 | * above 'top' to have base as its backing file. | |
2468 | * | |
2469 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2470 | * information in 'bs' can be properly updated. | |
2471 | * | |
2472 | * E.g., this will convert the following chain: | |
2473 | * bottom <- base <- intermediate <- top <- active | |
2474 | * | |
2475 | * to | |
2476 | * | |
2477 | * bottom <- base <- active | |
2478 | * | |
2479 | * It is allowed for bottom==base, in which case it converts: | |
2480 | * | |
2481 | * base <- intermediate <- top <- active | |
2482 | * | |
2483 | * to | |
2484 | * | |
2485 | * base <- active | |
2486 | * | |
2487 | * Error conditions: | |
2488 | * if active == top, that is considered an error | |
2489 | * | |
2490 | */ | |
2491 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2492 | BlockDriverState *base) | |
2493 | { | |
2494 | BlockDriverState *intermediate; | |
2495 | BlockDriverState *base_bs = NULL; | |
2496 | BlockDriverState *new_top_bs = NULL; | |
2497 | BlkIntermediateStates *intermediate_state, *next; | |
2498 | int ret = -EIO; | |
2499 | ||
2500 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2501 | QSIMPLEQ_INIT(&states_to_delete); | |
2502 | ||
2503 | if (!top->drv || !base->drv) { | |
2504 | goto exit; | |
2505 | } | |
2506 | ||
2507 | new_top_bs = bdrv_find_overlay(active, top); | |
2508 | ||
2509 | if (new_top_bs == NULL) { | |
2510 | /* we could not find the image above 'top', this is an error */ | |
2511 | goto exit; | |
2512 | } | |
2513 | ||
2514 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2515 | * to do, no intermediate images */ | |
2516 | if (new_top_bs->backing_hd == base) { | |
2517 | ret = 0; | |
2518 | goto exit; | |
2519 | } | |
2520 | ||
2521 | intermediate = top; | |
2522 | ||
2523 | /* now we will go down through the list, and add each BDS we find | |
2524 | * into our deletion queue, until we hit the 'base' | |
2525 | */ | |
2526 | while (intermediate) { | |
2527 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2528 | intermediate_state->bs = intermediate; | |
2529 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2530 | ||
2531 | if (intermediate->backing_hd == base) { | |
2532 | base_bs = intermediate->backing_hd; | |
2533 | break; | |
2534 | } | |
2535 | intermediate = intermediate->backing_hd; | |
2536 | } | |
2537 | if (base_bs == NULL) { | |
2538 | /* something went wrong, we did not end at the base. safely | |
2539 | * unravel everything, and exit with error */ | |
2540 | goto exit; | |
2541 | } | |
2542 | ||
2543 | /* success - we can delete the intermediate states, and link top->base */ | |
2544 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2545 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2546 | if (ret) { | |
2547 | goto exit; | |
2548 | } | |
2549 | new_top_bs->backing_hd = base_bs; | |
2550 | ||
355ef4ac | 2551 | bdrv_refresh_limits(new_top_bs); |
6ebdcee2 JC |
2552 | |
2553 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2554 | /* so that bdrv_close() does not recursively close the chain */ | |
2555 | intermediate_state->bs->backing_hd = NULL; | |
4f6fd349 | 2556 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2557 | } |
2558 | ret = 0; | |
2559 | ||
2560 | exit: | |
2561 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2562 | g_free(intermediate_state); | |
2563 | } | |
2564 | return ret; | |
2565 | } | |
2566 | ||
2567 | ||
71d0770c AL |
2568 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2569 | size_t size) | |
2570 | { | |
2571 | int64_t len; | |
2572 | ||
2573 | if (!bdrv_is_inserted(bs)) | |
2574 | return -ENOMEDIUM; | |
2575 | ||
2576 | if (bs->growable) | |
2577 | return 0; | |
2578 | ||
2579 | len = bdrv_getlength(bs); | |
2580 | ||
fbb7b4e0 KW |
2581 | if (offset < 0) |
2582 | return -EIO; | |
2583 | ||
2584 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2585 | return -EIO; |
2586 | ||
2587 | return 0; | |
2588 | } | |
2589 | ||
2590 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2591 | int nb_sectors) | |
2592 | { | |
eb5a3165 JS |
2593 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2594 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2595 | } |
2596 | ||
1c9805a3 SH |
2597 | typedef struct RwCo { |
2598 | BlockDriverState *bs; | |
775aa8b6 | 2599 | int64_t offset; |
1c9805a3 SH |
2600 | QEMUIOVector *qiov; |
2601 | bool is_write; | |
2602 | int ret; | |
4105eaaa | 2603 | BdrvRequestFlags flags; |
1c9805a3 SH |
2604 | } RwCo; |
2605 | ||
2606 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2607 | { |
1c9805a3 | 2608 | RwCo *rwco = opaque; |
ea2384d3 | 2609 | |
1c9805a3 | 2610 | if (!rwco->is_write) { |
775aa8b6 KW |
2611 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2612 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2613 | rwco->flags); |
775aa8b6 KW |
2614 | } else { |
2615 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2616 | rwco->qiov->size, rwco->qiov, | |
2617 | rwco->flags); | |
1c9805a3 SH |
2618 | } |
2619 | } | |
e7a8a783 | 2620 | |
1c9805a3 | 2621 | /* |
8d3b1a2d | 2622 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2623 | */ |
775aa8b6 KW |
2624 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2625 | QEMUIOVector *qiov, bool is_write, | |
2626 | BdrvRequestFlags flags) | |
1c9805a3 | 2627 | { |
1c9805a3 SH |
2628 | Coroutine *co; |
2629 | RwCo rwco = { | |
2630 | .bs = bs, | |
775aa8b6 | 2631 | .offset = offset, |
8d3b1a2d | 2632 | .qiov = qiov, |
1c9805a3 SH |
2633 | .is_write = is_write, |
2634 | .ret = NOT_DONE, | |
4105eaaa | 2635 | .flags = flags, |
1c9805a3 | 2636 | }; |
e7a8a783 | 2637 | |
498e386c ZYW |
2638 | /** |
2639 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2640 | * will not fire; so the I/O throttling function has to be disabled here | |
2641 | * if it has been enabled. | |
2642 | */ | |
2643 | if (bs->io_limits_enabled) { | |
2644 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2645 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2646 | bdrv_io_limits_disable(bs); | |
2647 | } | |
2648 | ||
1c9805a3 SH |
2649 | if (qemu_in_coroutine()) { |
2650 | /* Fast-path if already in coroutine context */ | |
2651 | bdrv_rw_co_entry(&rwco); | |
2652 | } else { | |
2653 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2654 | qemu_coroutine_enter(co, &rwco); | |
2655 | while (rwco.ret == NOT_DONE) { | |
2656 | qemu_aio_wait(); | |
2657 | } | |
2658 | } | |
2659 | return rwco.ret; | |
2660 | } | |
b338082b | 2661 | |
8d3b1a2d KW |
2662 | /* |
2663 | * Process a synchronous request using coroutines | |
2664 | */ | |
2665 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2666 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2667 | { |
2668 | QEMUIOVector qiov; | |
2669 | struct iovec iov = { | |
2670 | .iov_base = (void *)buf, | |
2671 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2672 | }; | |
2673 | ||
2674 | qemu_iovec_init_external(&qiov, &iov, 1); | |
775aa8b6 KW |
2675 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2676 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2677 | } |
2678 | ||
1c9805a3 SH |
2679 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2680 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2681 | uint8_t *buf, int nb_sectors) | |
2682 | { | |
4105eaaa | 2683 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2684 | } |
2685 | ||
07d27a44 MA |
2686 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2687 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2688 | uint8_t *buf, int nb_sectors) | |
2689 | { | |
2690 | bool enabled; | |
2691 | int ret; | |
2692 | ||
2693 | enabled = bs->io_limits_enabled; | |
2694 | bs->io_limits_enabled = false; | |
4e7395e8 | 2695 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2696 | bs->io_limits_enabled = enabled; |
2697 | return ret; | |
2698 | } | |
2699 | ||
5fafdf24 | 2700 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2701 | -EIO generic I/O error (may happen for all errors) |
2702 | -ENOMEDIUM No media inserted. | |
2703 | -EINVAL Invalid sector number or nb_sectors | |
2704 | -EACCES Trying to write a read-only device | |
2705 | */ | |
5fafdf24 | 2706 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2707 | const uint8_t *buf, int nb_sectors) |
2708 | { | |
4105eaaa | 2709 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2710 | } |
2711 | ||
aa7bfbff PL |
2712 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2713 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2714 | { |
2715 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2716 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2717 | } |
2718 | ||
d75cbb5e PL |
2719 | /* |
2720 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2721 | * The operation is sped up by checking the block status and only writing | |
2722 | * zeroes to the device if they currently do not return zeroes. Optional | |
2723 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2724 | * | |
2725 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2726 | */ | |
2727 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2728 | { | |
2729 | int64_t target_size = bdrv_getlength(bs) / BDRV_SECTOR_SIZE; | |
2730 | int64_t ret, nb_sectors, sector_num = 0; | |
2731 | int n; | |
2732 | ||
2733 | for (;;) { | |
2734 | nb_sectors = target_size - sector_num; | |
2735 | if (nb_sectors <= 0) { | |
2736 | return 0; | |
2737 | } | |
2738 | if (nb_sectors > INT_MAX) { | |
2739 | nb_sectors = INT_MAX; | |
2740 | } | |
2741 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2742 | if (ret < 0) { |
2743 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2744 | sector_num, strerror(-ret)); | |
2745 | return ret; | |
2746 | } | |
d75cbb5e PL |
2747 | if (ret & BDRV_BLOCK_ZERO) { |
2748 | sector_num += n; | |
2749 | continue; | |
2750 | } | |
2751 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2752 | if (ret < 0) { | |
2753 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2754 | sector_num, strerror(-ret)); | |
2755 | return ret; | |
2756 | } | |
2757 | sector_num += n; | |
2758 | } | |
2759 | } | |
2760 | ||
a3ef6571 | 2761 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2762 | { |
a3ef6571 KW |
2763 | QEMUIOVector qiov; |
2764 | struct iovec iov = { | |
2765 | .iov_base = (void *)buf, | |
2766 | .iov_len = bytes, | |
2767 | }; | |
9a8c4cce | 2768 | int ret; |
83f64091 | 2769 | |
a3ef6571 KW |
2770 | if (bytes < 0) { |
2771 | return -EINVAL; | |
83f64091 FB |
2772 | } |
2773 | ||
a3ef6571 KW |
2774 | qemu_iovec_init_external(&qiov, &iov, 1); |
2775 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2776 | if (ret < 0) { | |
2777 | return ret; | |
83f64091 | 2778 | } |
a3ef6571 KW |
2779 | |
2780 | return bytes; | |
83f64091 FB |
2781 | } |
2782 | ||
8d3b1a2d | 2783 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2784 | { |
9a8c4cce | 2785 | int ret; |
83f64091 | 2786 | |
8407d5d7 KW |
2787 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2788 | if (ret < 0) { | |
2789 | return ret; | |
83f64091 FB |
2790 | } |
2791 | ||
8d3b1a2d KW |
2792 | return qiov->size; |
2793 | } | |
2794 | ||
2795 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2796 | const void *buf, int bytes) |
8d3b1a2d KW |
2797 | { |
2798 | QEMUIOVector qiov; | |
2799 | struct iovec iov = { | |
2800 | .iov_base = (void *) buf, | |
8407d5d7 | 2801 | .iov_len = bytes, |
8d3b1a2d KW |
2802 | }; |
2803 | ||
8407d5d7 KW |
2804 | if (bytes < 0) { |
2805 | return -EINVAL; | |
2806 | } | |
2807 | ||
8d3b1a2d KW |
2808 | qemu_iovec_init_external(&qiov, &iov, 1); |
2809 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2810 | } |
83f64091 | 2811 | |
f08145fe KW |
2812 | /* |
2813 | * Writes to the file and ensures that no writes are reordered across this | |
2814 | * request (acts as a barrier) | |
2815 | * | |
2816 | * Returns 0 on success, -errno in error cases. | |
2817 | */ | |
2818 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2819 | const void *buf, int count) | |
2820 | { | |
2821 | int ret; | |
2822 | ||
2823 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2824 | if (ret < 0) { | |
2825 | return ret; | |
2826 | } | |
2827 | ||
f05fa4ad PB |
2828 | /* No flush needed for cache modes that already do it */ |
2829 | if (bs->enable_write_cache) { | |
f08145fe KW |
2830 | bdrv_flush(bs); |
2831 | } | |
2832 | ||
2833 | return 0; | |
2834 | } | |
2835 | ||
470c0504 | 2836 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2837 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2838 | { | |
2839 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2840 | * their read buffer while the operation is in progress do not end up | |
2841 | * modifying the image file. This is critical for zero-copy guest I/O | |
2842 | * where anything might happen inside guest memory. | |
2843 | */ | |
2844 | void *bounce_buffer; | |
2845 | ||
79c053bd | 2846 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2847 | struct iovec iov; |
2848 | QEMUIOVector bounce_qiov; | |
2849 | int64_t cluster_sector_num; | |
2850 | int cluster_nb_sectors; | |
2851 | size_t skip_bytes; | |
2852 | int ret; | |
2853 | ||
2854 | /* Cover entire cluster so no additional backing file I/O is required when | |
2855 | * allocating cluster in the image file. | |
2856 | */ | |
343bded4 PB |
2857 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2858 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2859 | |
470c0504 SH |
2860 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2861 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2862 | |
2863 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2864 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2865 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2866 | ||
79c053bd SH |
2867 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2868 | &bounce_qiov); | |
ab185921 SH |
2869 | if (ret < 0) { |
2870 | goto err; | |
2871 | } | |
2872 | ||
79c053bd SH |
2873 | if (drv->bdrv_co_write_zeroes && |
2874 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 2875 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 2876 | cluster_nb_sectors, 0); |
79c053bd | 2877 | } else { |
f05fa4ad PB |
2878 | /* This does not change the data on the disk, it is not necessary |
2879 | * to flush even in cache=writethrough mode. | |
2880 | */ | |
79c053bd | 2881 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2882 | &bounce_qiov); |
79c053bd SH |
2883 | } |
2884 | ||
ab185921 SH |
2885 | if (ret < 0) { |
2886 | /* It might be okay to ignore write errors for guest requests. If this | |
2887 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2888 | * Simply report it in all cases. | |
2889 | */ | |
2890 | goto err; | |
2891 | } | |
2892 | ||
2893 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2894 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2895 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2896 | |
2897 | err: | |
2898 | qemu_vfree(bounce_buffer); | |
2899 | return ret; | |
2900 | } | |
2901 | ||
c5fbe571 | 2902 | /* |
d0c7f642 KW |
2903 | * Forwards an already correctly aligned request to the BlockDriver. This |
2904 | * handles copy on read and zeroing after EOF; any other features must be | |
2905 | * implemented by the caller. | |
c5fbe571 | 2906 | */ |
d0c7f642 | 2907 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 2908 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 2909 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
2910 | { |
2911 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2912 | int ret; |
da1fa91d | 2913 | |
d0c7f642 KW |
2914 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
2915 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 2916 | |
d0c7f642 KW |
2917 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
2918 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
2919 | ||
2920 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 2921 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
2922 | /* If we touch the same cluster it counts as an overlap. This |
2923 | * guarantees that allocating writes will be serialized and not race | |
2924 | * with each other for the same cluster. For example, in copy-on-read | |
2925 | * it ensures that the CoR read and write operations are atomic and | |
2926 | * guest writes cannot interleave between them. */ | |
2927 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
2928 | } |
2929 | ||
2dbafdc0 | 2930 | wait_serialising_requests(req); |
f4658285 | 2931 | |
470c0504 | 2932 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2933 | int pnum; |
2934 | ||
bdad13b9 | 2935 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
2936 | if (ret < 0) { |
2937 | goto out; | |
2938 | } | |
2939 | ||
2940 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2941 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2942 | goto out; |
2943 | } | |
2944 | } | |
2945 | ||
d0c7f642 | 2946 | /* Forward the request to the BlockDriver */ |
893a8f62 MK |
2947 | if (!(bs->zero_beyond_eof && bs->growable)) { |
2948 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
2949 | } else { | |
2950 | /* Read zeros after EOF of growable BDSes */ | |
2951 | int64_t len, total_sectors, max_nb_sectors; | |
2952 | ||
2953 | len = bdrv_getlength(bs); | |
2954 | if (len < 0) { | |
2955 | ret = len; | |
2956 | goto out; | |
2957 | } | |
2958 | ||
d055a1fe | 2959 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
5f5bcd80 KW |
2960 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
2961 | align >> BDRV_SECTOR_BITS); | |
893a8f62 MK |
2962 | if (max_nb_sectors > 0) { |
2963 | ret = drv->bdrv_co_readv(bs, sector_num, | |
2964 | MIN(nb_sectors, max_nb_sectors), qiov); | |
2965 | } else { | |
2966 | ret = 0; | |
2967 | } | |
2968 | ||
2969 | /* Reading beyond end of file is supposed to produce zeroes */ | |
2970 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
2971 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
2972 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
2973 | BDRV_SECTOR_SIZE; | |
2974 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
2975 | } | |
2976 | } | |
ab185921 SH |
2977 | |
2978 | out: | |
dbffbdcf | 2979 | return ret; |
da1fa91d KW |
2980 | } |
2981 | ||
d0c7f642 KW |
2982 | /* |
2983 | * Handle a read request in coroutine context | |
2984 | */ | |
1b0288ae KW |
2985 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
2986 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
2987 | BdrvRequestFlags flags) |
2988 | { | |
2989 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
2990 | BdrvTrackedRequest req; |
2991 | ||
1b0288ae KW |
2992 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
2993 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
2994 | uint8_t *head_buf = NULL; | |
2995 | uint8_t *tail_buf = NULL; | |
2996 | QEMUIOVector local_qiov; | |
2997 | bool use_local_qiov = false; | |
d0c7f642 KW |
2998 | int ret; |
2999 | ||
3000 | if (!drv) { | |
3001 | return -ENOMEDIUM; | |
3002 | } | |
1b0288ae | 3003 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
d0c7f642 KW |
3004 | return -EIO; |
3005 | } | |
3006 | ||
3007 | if (bs->copy_on_read) { | |
3008 | flags |= BDRV_REQ_COPY_ON_READ; | |
3009 | } | |
3010 | ||
3011 | /* throttling disk I/O */ | |
3012 | if (bs->io_limits_enabled) { | |
d5103588 | 3013 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3014 | } |
3015 | ||
3016 | /* Align read if necessary by padding qiov */ | |
3017 | if (offset & (align - 1)) { | |
3018 | head_buf = qemu_blockalign(bs, align); | |
3019 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3020 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3021 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3022 | use_local_qiov = true; | |
3023 | ||
3024 | bytes += offset & (align - 1); | |
3025 | offset = offset & ~(align - 1); | |
3026 | } | |
3027 | ||
3028 | if ((offset + bytes) & (align - 1)) { | |
3029 | if (!use_local_qiov) { | |
3030 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3031 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3032 | use_local_qiov = true; | |
3033 | } | |
3034 | tail_buf = qemu_blockalign(bs, align); | |
3035 | qemu_iovec_add(&local_qiov, tail_buf, | |
3036 | align - ((offset + bytes) & (align - 1))); | |
3037 | ||
3038 | bytes = ROUND_UP(bytes, align); | |
3039 | } | |
3040 | ||
65afd211 | 3041 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3042 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3043 | use_local_qiov ? &local_qiov : qiov, |
3044 | flags); | |
65afd211 | 3045 | tracked_request_end(&req); |
1b0288ae KW |
3046 | |
3047 | if (use_local_qiov) { | |
3048 | qemu_iovec_destroy(&local_qiov); | |
3049 | qemu_vfree(head_buf); | |
3050 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3051 | } |
3052 | ||
d0c7f642 KW |
3053 | return ret; |
3054 | } | |
3055 | ||
1b0288ae KW |
3056 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3057 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3058 | BdrvRequestFlags flags) | |
3059 | { | |
3060 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { | |
3061 | return -EINVAL; | |
3062 | } | |
3063 | ||
3064 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3065 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3066 | } | |
3067 | ||
c5fbe571 | 3068 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3069 | int nb_sectors, QEMUIOVector *qiov) |
3070 | { | |
c5fbe571 | 3071 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3072 | |
470c0504 SH |
3073 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3074 | } | |
3075 | ||
3076 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3077 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3078 | { | |
3079 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3080 | ||
3081 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3082 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3083 | } |
3084 | ||
c31cb707 PL |
3085 | /* if no limit is specified in the BlockLimits use a default |
3086 | * of 32768 512-byte sectors (16 MiB) per request. | |
3087 | */ | |
3088 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
3089 | ||
f08f2dda | 3090 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3091 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3092 | { |
3093 | BlockDriver *drv = bs->drv; | |
3094 | QEMUIOVector qiov; | |
c31cb707 PL |
3095 | struct iovec iov = {0}; |
3096 | int ret = 0; | |
f08f2dda | 3097 | |
c31cb707 PL |
3098 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
3099 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 3100 | |
c31cb707 PL |
3101 | while (nb_sectors > 0 && !ret) { |
3102 | int num = nb_sectors; | |
3103 | ||
b8d71c09 PB |
3104 | /* Align request. Block drivers can expect the "bulk" of the request |
3105 | * to be aligned. | |
3106 | */ | |
3107 | if (bs->bl.write_zeroes_alignment | |
3108 | && num > bs->bl.write_zeroes_alignment) { | |
3109 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3110 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3111 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3112 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3113 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3114 | /* Shorten the request to the last aligned sector. num cannot | |
3115 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3116 | */ | |
3117 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3118 | } |
621f0589 | 3119 | } |
f08f2dda | 3120 | |
c31cb707 PL |
3121 | /* limit request size */ |
3122 | if (num > max_write_zeroes) { | |
3123 | num = max_write_zeroes; | |
3124 | } | |
3125 | ||
3126 | ret = -ENOTSUP; | |
3127 | /* First try the efficient write zeroes operation */ | |
3128 | if (drv->bdrv_co_write_zeroes) { | |
3129 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3130 | } | |
3131 | ||
3132 | if (ret == -ENOTSUP) { | |
3133 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
3134 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
3135 | if (iov.iov_base == NULL) { | |
b8d71c09 PB |
3136 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3137 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); | |
c31cb707 PL |
3138 | } |
3139 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3140 | |
c31cb707 | 3141 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3142 | |
3143 | /* Keep bounce buffer around if it is big enough for all | |
3144 | * all future requests. | |
3145 | */ | |
3146 | if (num < max_write_zeroes) { | |
3147 | qemu_vfree(iov.iov_base); | |
3148 | iov.iov_base = NULL; | |
3149 | } | |
c31cb707 PL |
3150 | } |
3151 | ||
3152 | sector_num += num; | |
3153 | nb_sectors -= num; | |
3154 | } | |
f08f2dda SH |
3155 | |
3156 | qemu_vfree(iov.iov_base); | |
3157 | return ret; | |
3158 | } | |
3159 | ||
c5fbe571 | 3160 | /* |
b404f720 | 3161 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3162 | */ |
b404f720 | 3163 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3164 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3165 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3166 | { |
3167 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3168 | bool waited; |
6b7cb247 | 3169 | int ret; |
da1fa91d | 3170 | |
b404f720 KW |
3171 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3172 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3173 | |
b404f720 KW |
3174 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3175 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
cc0681c4 | 3176 | |
28de2dcd KW |
3177 | waited = wait_serialising_requests(req); |
3178 | assert(!waited || !req->serialising); | |
af91f9a7 KW |
3179 | assert(req->overlap_offset <= offset); |
3180 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); | |
244eadef | 3181 | |
65afd211 | 3182 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
d616b224 SH |
3183 | |
3184 | if (ret < 0) { | |
3185 | /* Do nothing, write notifier decided to fail this request */ | |
3186 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
9e1cb96d | 3187 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
aa7bfbff | 3188 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3189 | } else { |
9e1cb96d | 3190 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
f08f2dda SH |
3191 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
3192 | } | |
9e1cb96d | 3193 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
6b7cb247 | 3194 | |
f05fa4ad PB |
3195 | if (ret == 0 && !bs->enable_write_cache) { |
3196 | ret = bdrv_co_flush(bs); | |
3197 | } | |
3198 | ||
e4654d2d | 3199 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
3200 | |
3201 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
3202 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
3203 | } | |
df2a6f29 PB |
3204 | if (bs->growable && ret >= 0) { |
3205 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
3206 | } | |
da1fa91d | 3207 | |
6b7cb247 | 3208 | return ret; |
da1fa91d KW |
3209 | } |
3210 | ||
b404f720 KW |
3211 | /* |
3212 | * Handle a write request in coroutine context | |
3213 | */ | |
6601553e KW |
3214 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3215 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3216 | BdrvRequestFlags flags) |
3217 | { | |
65afd211 | 3218 | BdrvTrackedRequest req; |
3b8242e0 KW |
3219 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3220 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3221 | uint8_t *head_buf = NULL; | |
3222 | uint8_t *tail_buf = NULL; | |
3223 | QEMUIOVector local_qiov; | |
3224 | bool use_local_qiov = false; | |
b404f720 KW |
3225 | int ret; |
3226 | ||
3227 | if (!bs->drv) { | |
3228 | return -ENOMEDIUM; | |
3229 | } | |
3230 | if (bs->read_only) { | |
3231 | return -EACCES; | |
3232 | } | |
6601553e | 3233 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
b404f720 KW |
3234 | return -EIO; |
3235 | } | |
3236 | ||
b404f720 KW |
3237 | /* throttling disk I/O */ |
3238 | if (bs->io_limits_enabled) { | |
d5103588 | 3239 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3240 | } |
3241 | ||
3b8242e0 KW |
3242 | /* |
3243 | * Align write if necessary by performing a read-modify-write cycle. | |
3244 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3245 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3246 | */ | |
65afd211 | 3247 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3248 | |
3249 | if (offset & (align - 1)) { | |
3250 | QEMUIOVector head_qiov; | |
3251 | struct iovec head_iov; | |
3252 | ||
3253 | mark_request_serialising(&req, align); | |
3254 | wait_serialising_requests(&req); | |
3255 | ||
3256 | head_buf = qemu_blockalign(bs, align); | |
3257 | head_iov = (struct iovec) { | |
3258 | .iov_base = head_buf, | |
3259 | .iov_len = align, | |
3260 | }; | |
3261 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3262 | ||
9e1cb96d | 3263 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3264 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3265 | align, &head_qiov, 0); | |
3266 | if (ret < 0) { | |
3267 | goto fail; | |
3268 | } | |
9e1cb96d | 3269 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3270 | |
3271 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3272 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3273 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3274 | use_local_qiov = true; | |
3275 | ||
3276 | bytes += offset & (align - 1); | |
3277 | offset = offset & ~(align - 1); | |
3278 | } | |
3279 | ||
3280 | if ((offset + bytes) & (align - 1)) { | |
3281 | QEMUIOVector tail_qiov; | |
3282 | struct iovec tail_iov; | |
3283 | size_t tail_bytes; | |
28de2dcd | 3284 | bool waited; |
3b8242e0 KW |
3285 | |
3286 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3287 | waited = wait_serialising_requests(&req); |
3288 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3289 | |
3290 | tail_buf = qemu_blockalign(bs, align); | |
3291 | tail_iov = (struct iovec) { | |
3292 | .iov_base = tail_buf, | |
3293 | .iov_len = align, | |
3294 | }; | |
3295 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3296 | ||
9e1cb96d | 3297 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3298 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3299 | align, &tail_qiov, 0); | |
3300 | if (ret < 0) { | |
3301 | goto fail; | |
3302 | } | |
9e1cb96d | 3303 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3304 | |
3305 | if (!use_local_qiov) { | |
3306 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3307 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3308 | use_local_qiov = true; | |
3309 | } | |
3310 | ||
3311 | tail_bytes = (offset + bytes) & (align - 1); | |
3312 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3313 | ||
3314 | bytes = ROUND_UP(bytes, align); | |
3315 | } | |
3316 | ||
3317 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, | |
3318 | use_local_qiov ? &local_qiov : qiov, | |
3319 | flags); | |
3320 | ||
3321 | fail: | |
65afd211 | 3322 | tracked_request_end(&req); |
b404f720 | 3323 | |
3b8242e0 KW |
3324 | if (use_local_qiov) { |
3325 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3326 | } |
99c4a85c KW |
3327 | qemu_vfree(head_buf); |
3328 | qemu_vfree(tail_buf); | |
3b8242e0 | 3329 | |
b404f720 KW |
3330 | return ret; |
3331 | } | |
3332 | ||
6601553e KW |
3333 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3334 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3335 | BdrvRequestFlags flags) | |
3336 | { | |
3337 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { | |
3338 | return -EINVAL; | |
3339 | } | |
3340 | ||
3341 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3342 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3343 | } | |
3344 | ||
c5fbe571 SH |
3345 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3346 | int nb_sectors, QEMUIOVector *qiov) | |
3347 | { | |
3348 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3349 | ||
f08f2dda SH |
3350 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3351 | } | |
3352 | ||
3353 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3354 | int64_t sector_num, int nb_sectors, |
3355 | BdrvRequestFlags flags) | |
f08f2dda | 3356 | { |
94d6ff21 | 3357 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3358 | |
d32f35cb PL |
3359 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3360 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3361 | } | |
3362 | ||
f08f2dda | 3363 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3364 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3365 | } |
3366 | ||
83f64091 FB |
3367 | /** |
3368 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3369 | */ | |
3370 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3371 | { | |
3372 | BlockDriver *drv = bs->drv; | |
51762288 | 3373 | int ret; |
83f64091 | 3374 | if (!drv) |
19cb3738 | 3375 | return -ENOMEDIUM; |
83f64091 FB |
3376 | if (!drv->bdrv_truncate) |
3377 | return -ENOTSUP; | |
59f2689d NS |
3378 | if (bs->read_only) |
3379 | return -EACCES; | |
8591675f MT |
3380 | if (bdrv_in_use(bs)) |
3381 | return -EBUSY; | |
51762288 SH |
3382 | ret = drv->bdrv_truncate(bs, offset); |
3383 | if (ret == 0) { | |
3384 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3385 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3386 | } |
3387 | return ret; | |
83f64091 FB |
3388 | } |
3389 | ||
4a1d5e1f FZ |
3390 | /** |
3391 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3392 | * allocated space. Return < 0 if error or unknown. | |
3393 | */ | |
3394 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3395 | { | |
3396 | BlockDriver *drv = bs->drv; | |
3397 | if (!drv) { | |
3398 | return -ENOMEDIUM; | |
3399 | } | |
3400 | if (drv->bdrv_get_allocated_file_size) { | |
3401 | return drv->bdrv_get_allocated_file_size(bs); | |
3402 | } | |
3403 | if (bs->file) { | |
3404 | return bdrv_get_allocated_file_size(bs->file); | |
3405 | } | |
3406 | return -ENOTSUP; | |
3407 | } | |
3408 | ||
83f64091 FB |
3409 | /** |
3410 | * Length of a file in bytes. Return < 0 if error or unknown. | |
3411 | */ | |
3412 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3413 | { | |
3414 | BlockDriver *drv = bs->drv; | |
3415 | if (!drv) | |
19cb3738 | 3416 | return -ENOMEDIUM; |
51762288 | 3417 | |
b94a2610 KW |
3418 | if (drv->has_variable_length) { |
3419 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3420 | if (ret < 0) { | |
3421 | return ret; | |
46a4e4e6 | 3422 | } |
83f64091 | 3423 | } |
46a4e4e6 | 3424 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3425 | } |
3426 | ||
19cb3738 | 3427 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3428 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3429 | { |
19cb3738 FB |
3430 | int64_t length; |
3431 | length = bdrv_getlength(bs); | |
3432 | if (length < 0) | |
3433 | length = 0; | |
3434 | else | |
6ea44308 | 3435 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 3436 | *nb_sectors_ptr = length; |
fc01f7e7 | 3437 | } |
cf98951b | 3438 | |
ff06f5f3 PB |
3439 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3440 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3441 | { |
3442 | bs->on_read_error = on_read_error; | |
3443 | bs->on_write_error = on_write_error; | |
3444 | } | |
3445 | ||
1ceee0d5 | 3446 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3447 | { |
3448 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3449 | } | |
3450 | ||
3e1caa5f PB |
3451 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3452 | { | |
3453 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3454 | ||
3455 | switch (on_err) { | |
3456 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
3457 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
3458 | case BLOCKDEV_ON_ERROR_STOP: | |
3459 | return BDRV_ACTION_STOP; | |
3460 | case BLOCKDEV_ON_ERROR_REPORT: | |
3461 | return BDRV_ACTION_REPORT; | |
3462 | case BLOCKDEV_ON_ERROR_IGNORE: | |
3463 | return BDRV_ACTION_IGNORE; | |
3464 | default: | |
3465 | abort(); | |
3466 | } | |
3467 | } | |
3468 | ||
3469 | /* This is done by device models because, while the block layer knows | |
3470 | * about the error, it does not know whether an operation comes from | |
3471 | * the device or the block layer (from a job, for example). | |
3472 | */ | |
3473 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3474 | bool is_read, int error) | |
3475 | { | |
3476 | assert(error >= 0); | |
32c81a4a | 3477 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
3478 | if (action == BDRV_ACTION_STOP) { |
3479 | vm_stop(RUN_STATE_IO_ERROR); | |
3480 | bdrv_iostatus_set_err(bs, error); | |
3481 | } | |
3482 | } | |
3483 | ||
b338082b FB |
3484 | int bdrv_is_read_only(BlockDriverState *bs) |
3485 | { | |
3486 | return bs->read_only; | |
3487 | } | |
3488 | ||
985a03b0 TS |
3489 | int bdrv_is_sg(BlockDriverState *bs) |
3490 | { | |
3491 | return bs->sg; | |
3492 | } | |
3493 | ||
e900a7b7 CH |
3494 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3495 | { | |
3496 | return bs->enable_write_cache; | |
3497 | } | |
3498 | ||
425b0148 PB |
3499 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3500 | { | |
3501 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3502 | |
3503 | /* so a reopen() will preserve wce */ | |
3504 | if (wce) { | |
3505 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3506 | } else { | |
3507 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3508 | } | |
425b0148 PB |
3509 | } |
3510 | ||
ea2384d3 FB |
3511 | int bdrv_is_encrypted(BlockDriverState *bs) |
3512 | { | |
3513 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3514 | return 1; | |
3515 | return bs->encrypted; | |
3516 | } | |
3517 | ||
c0f4ce77 AL |
3518 | int bdrv_key_required(BlockDriverState *bs) |
3519 | { | |
3520 | BlockDriverState *backing_hd = bs->backing_hd; | |
3521 | ||
3522 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3523 | return 1; | |
3524 | return (bs->encrypted && !bs->valid_key); | |
3525 | } | |
3526 | ||
ea2384d3 FB |
3527 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3528 | { | |
3529 | int ret; | |
3530 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3531 | ret = bdrv_set_key(bs->backing_hd, key); | |
3532 | if (ret < 0) | |
3533 | return ret; | |
3534 | if (!bs->encrypted) | |
3535 | return 0; | |
3536 | } | |
fd04a2ae SH |
3537 | if (!bs->encrypted) { |
3538 | return -EINVAL; | |
3539 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3540 | return -ENOMEDIUM; | |
3541 | } | |
c0f4ce77 | 3542 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3543 | if (ret < 0) { |
3544 | bs->valid_key = 0; | |
3545 | } else if (!bs->valid_key) { | |
3546 | bs->valid_key = 1; | |
3547 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3548 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3549 | } |
c0f4ce77 | 3550 | return ret; |
ea2384d3 FB |
3551 | } |
3552 | ||
f8d6bba1 | 3553 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3554 | { |
f8d6bba1 | 3555 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3556 | } |
3557 | ||
5fafdf24 | 3558 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3559 | void *opaque) |
3560 | { | |
3561 | BlockDriver *drv; | |
3562 | ||
8a22f02a | 3563 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
3564 | it(opaque, drv->format_name); |
3565 | } | |
3566 | } | |
3567 | ||
dc364f4c | 3568 | /* This function is to find block backend bs */ |
b338082b FB |
3569 | BlockDriverState *bdrv_find(const char *name) |
3570 | { | |
3571 | BlockDriverState *bs; | |
3572 | ||
dc364f4c | 3573 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
1b7bdbc1 | 3574 | if (!strcmp(name, bs->device_name)) { |
b338082b | 3575 | return bs; |
1b7bdbc1 | 3576 | } |
b338082b FB |
3577 | } |
3578 | return NULL; | |
3579 | } | |
3580 | ||
dc364f4c BC |
3581 | /* This function is to find a node in the bs graph */ |
3582 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3583 | { | |
3584 | BlockDriverState *bs; | |
3585 | ||
3586 | assert(node_name); | |
3587 | ||
3588 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3589 | if (!strcmp(node_name, bs->node_name)) { | |
3590 | return bs; | |
3591 | } | |
3592 | } | |
3593 | return NULL; | |
3594 | } | |
3595 | ||
c13163fb BC |
3596 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3597 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3598 | { | |
3599 | BlockDeviceInfoList *list, *entry; | |
3600 | BlockDriverState *bs; | |
3601 | ||
3602 | list = NULL; | |
3603 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3604 | entry = g_malloc0(sizeof(*entry)); | |
3605 | entry->value = bdrv_block_device_info(bs); | |
3606 | entry->next = list; | |
3607 | list = entry; | |
3608 | } | |
3609 | ||
3610 | return list; | |
3611 | } | |
3612 | ||
12d3ba82 BC |
3613 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3614 | const char *node_name, | |
3615 | Error **errp) | |
3616 | { | |
3617 | BlockDriverState *bs = NULL; | |
3618 | ||
12d3ba82 BC |
3619 | if (device) { |
3620 | bs = bdrv_find(device); | |
3621 | ||
dd67fa50 BC |
3622 | if (bs) { |
3623 | return bs; | |
12d3ba82 | 3624 | } |
12d3ba82 BC |
3625 | } |
3626 | ||
dd67fa50 BC |
3627 | if (node_name) { |
3628 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3629 | |
dd67fa50 BC |
3630 | if (bs) { |
3631 | return bs; | |
3632 | } | |
12d3ba82 BC |
3633 | } |
3634 | ||
dd67fa50 BC |
3635 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3636 | device ? device : "", | |
3637 | node_name ? node_name : ""); | |
3638 | return NULL; | |
12d3ba82 BC |
3639 | } |
3640 | ||
2f399b0a MA |
3641 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3642 | { | |
3643 | if (!bs) { | |
3644 | return QTAILQ_FIRST(&bdrv_states); | |
3645 | } | |
dc364f4c | 3646 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3647 | } |
3648 | ||
51de9760 | 3649 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3650 | { |
3651 | BlockDriverState *bs; | |
3652 | ||
dc364f4c | 3653 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
51de9760 | 3654 | it(opaque, bs); |
81d0912d FB |
3655 | } |
3656 | } | |
3657 | ||
ea2384d3 FB |
3658 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3659 | { | |
3660 | return bs->device_name; | |
3661 | } | |
3662 | ||
c8433287 MA |
3663 | int bdrv_get_flags(BlockDriverState *bs) |
3664 | { | |
3665 | return bs->open_flags; | |
3666 | } | |
3667 | ||
f0f0fdfe | 3668 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3669 | { |
3670 | BlockDriverState *bs; | |
f0f0fdfe | 3671 | int result = 0; |
c6ca28d6 | 3672 | |
dc364f4c | 3673 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
f0f0fdfe KW |
3674 | int ret = bdrv_flush(bs); |
3675 | if (ret < 0 && !result) { | |
3676 | result = ret; | |
3677 | } | |
1b7bdbc1 | 3678 | } |
f0f0fdfe KW |
3679 | |
3680 | return result; | |
c6ca28d6 AL |
3681 | } |
3682 | ||
3ac21627 PL |
3683 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3684 | { | |
3685 | return 1; | |
3686 | } | |
3687 | ||
f2feebbd KW |
3688 | int bdrv_has_zero_init(BlockDriverState *bs) |
3689 | { | |
3690 | assert(bs->drv); | |
3691 | ||
11212d8f PB |
3692 | /* If BS is a copy on write image, it is initialized to |
3693 | the contents of the base image, which may not be zeroes. */ | |
3694 | if (bs->backing_hd) { | |
3695 | return 0; | |
3696 | } | |
336c1c12 KW |
3697 | if (bs->drv->bdrv_has_zero_init) { |
3698 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3699 | } |
3700 | ||
3ac21627 PL |
3701 | /* safe default */ |
3702 | return 0; | |
f2feebbd KW |
3703 | } |
3704 | ||
4ce78691 PL |
3705 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3706 | { | |
3707 | BlockDriverInfo bdi; | |
3708 | ||
3709 | if (bs->backing_hd) { | |
3710 | return false; | |
3711 | } | |
3712 | ||
3713 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3714 | return bdi.unallocated_blocks_are_zero; | |
3715 | } | |
3716 | ||
3717 | return false; | |
3718 | } | |
3719 | ||
3720 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3721 | { | |
3722 | BlockDriverInfo bdi; | |
3723 | ||
3724 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3725 | return false; | |
3726 | } | |
3727 | ||
3728 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3729 | return bdi.can_write_zeroes_with_unmap; | |
3730 | } | |
3731 | ||
3732 | return false; | |
3733 | } | |
3734 | ||
b6b8a333 | 3735 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3736 | BlockDriverState *bs; |
b35b2bba | 3737 | BlockDriverState *base; |
376ae3f1 SH |
3738 | int64_t sector_num; |
3739 | int nb_sectors; | |
3740 | int *pnum; | |
b6b8a333 | 3741 | int64_t ret; |
376ae3f1 | 3742 | bool done; |
b6b8a333 | 3743 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3744 | |
f58c7b35 TS |
3745 | /* |
3746 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3747 | * not implementing the functionality are assumed to not support backing files, | |
3748 | * hence all their sectors are reported as allocated. | |
3749 | * | |
bd9533e3 SH |
3750 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3751 | * and 'pnum' is set to 0. | |
3752 | * | |
f58c7b35 TS |
3753 | * 'pnum' is set to the number of sectors (including and immediately following |
3754 | * the specified sector) that are known to be in the same | |
3755 | * allocated/unallocated state. | |
3756 | * | |
bd9533e3 SH |
3757 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3758 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3759 | */ |
b6b8a333 PB |
3760 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3761 | int64_t sector_num, | |
3762 | int nb_sectors, int *pnum) | |
f58c7b35 | 3763 | { |
617ccb46 | 3764 | int64_t length; |
bd9533e3 | 3765 | int64_t n; |
5daa74a6 | 3766 | int64_t ret, ret2; |
bd9533e3 | 3767 | |
617ccb46 PB |
3768 | length = bdrv_getlength(bs); |
3769 | if (length < 0) { | |
3770 | return length; | |
3771 | } | |
3772 | ||
3773 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3774 | *pnum = 0; |
3775 | return 0; | |
3776 | } | |
3777 | ||
3778 | n = bs->total_sectors - sector_num; | |
3779 | if (n < nb_sectors) { | |
3780 | nb_sectors = n; | |
3781 | } | |
3782 | ||
b6b8a333 | 3783 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3784 | *pnum = nb_sectors; |
918e92d7 PB |
3785 | ret = BDRV_BLOCK_DATA; |
3786 | if (bs->drv->protocol_name) { | |
3787 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3788 | } | |
3789 | return ret; | |
f58c7b35 | 3790 | } |
6aebab14 | 3791 | |
415b5b01 PB |
3792 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3793 | if (ret < 0) { | |
3e0a233d | 3794 | *pnum = 0; |
415b5b01 PB |
3795 | return ret; |
3796 | } | |
3797 | ||
92bc50a5 PL |
3798 | if (ret & BDRV_BLOCK_RAW) { |
3799 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
3800 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3801 | *pnum, pnum); | |
3802 | } | |
3803 | ||
c3d86884 PL |
3804 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
3805 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 3806 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 3807 | } else if (bs->backing_hd) { |
f0ad5712 PB |
3808 | BlockDriverState *bs2 = bs->backing_hd; |
3809 | int64_t length2 = bdrv_getlength(bs2); | |
3810 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3811 | ret |= BDRV_BLOCK_ZERO; | |
3812 | } | |
3813 | } | |
415b5b01 | 3814 | } |
5daa74a6 PB |
3815 | |
3816 | if (bs->file && | |
3817 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3818 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3819 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3820 | *pnum, pnum); | |
3821 | if (ret2 >= 0) { | |
3822 | /* Ignore errors. This is just providing extra information, it | |
3823 | * is useful but not necessary. | |
3824 | */ | |
3825 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3826 | } | |
3827 | } | |
3828 | ||
415b5b01 | 3829 | return ret; |
060f51c9 SH |
3830 | } |
3831 | ||
b6b8a333 PB |
3832 | /* Coroutine wrapper for bdrv_get_block_status() */ |
3833 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 3834 | { |
b6b8a333 | 3835 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
3836 | BlockDriverState *bs = data->bs; |
3837 | ||
b6b8a333 PB |
3838 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
3839 | data->pnum); | |
060f51c9 SH |
3840 | data->done = true; |
3841 | } | |
3842 | ||
3843 | /* | |
b6b8a333 | 3844 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 3845 | * |
b6b8a333 | 3846 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 3847 | */ |
b6b8a333 PB |
3848 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
3849 | int nb_sectors, int *pnum) | |
060f51c9 | 3850 | { |
6aebab14 | 3851 | Coroutine *co; |
b6b8a333 | 3852 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
3853 | .bs = bs, |
3854 | .sector_num = sector_num, | |
3855 | .nb_sectors = nb_sectors, | |
3856 | .pnum = pnum, | |
3857 | .done = false, | |
3858 | }; | |
3859 | ||
bdad13b9 PB |
3860 | if (qemu_in_coroutine()) { |
3861 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 3862 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 3863 | } else { |
b6b8a333 | 3864 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
3865 | qemu_coroutine_enter(co, &data); |
3866 | while (!data.done) { | |
3867 | qemu_aio_wait(); | |
3868 | } | |
6aebab14 SH |
3869 | } |
3870 | return data.ret; | |
f58c7b35 TS |
3871 | } |
3872 | ||
b6b8a333 PB |
3873 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
3874 | int nb_sectors, int *pnum) | |
3875 | { | |
4333bb71 PB |
3876 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
3877 | if (ret < 0) { | |
3878 | return ret; | |
3879 | } | |
3880 | return | |
3881 | (ret & BDRV_BLOCK_DATA) || | |
3882 | ((ret & BDRV_BLOCK_ZERO) && !bdrv_has_zero_init(bs)); | |
b6b8a333 PB |
3883 | } |
3884 | ||
188a7bbf PB |
3885 | /* |
3886 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3887 | * | |
3888 | * Return true if the given sector is allocated in any image between | |
3889 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3890 | * sector is allocated in any image of the chain. Return false otherwise. | |
3891 | * | |
3892 | * 'pnum' is set to the number of sectors (including and immediately following | |
3893 | * the specified sector) that are known to be in the same | |
3894 | * allocated/unallocated state. | |
3895 | * | |
3896 | */ | |
4f578637 PB |
3897 | int bdrv_is_allocated_above(BlockDriverState *top, |
3898 | BlockDriverState *base, | |
3899 | int64_t sector_num, | |
3900 | int nb_sectors, int *pnum) | |
188a7bbf PB |
3901 | { |
3902 | BlockDriverState *intermediate; | |
3903 | int ret, n = nb_sectors; | |
3904 | ||
3905 | intermediate = top; | |
3906 | while (intermediate && intermediate != base) { | |
3907 | int pnum_inter; | |
bdad13b9 PB |
3908 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
3909 | &pnum_inter); | |
188a7bbf PB |
3910 | if (ret < 0) { |
3911 | return ret; | |
3912 | } else if (ret) { | |
3913 | *pnum = pnum_inter; | |
3914 | return 1; | |
3915 | } | |
3916 | ||
3917 | /* | |
3918 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3919 | * might have | |
3920 | * | |
3921 | * [sector_num+x, nr_sectors] allocated. | |
3922 | */ | |
63ba17d3 VI |
3923 | if (n > pnum_inter && |
3924 | (intermediate == top || | |
3925 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3926 | n = pnum_inter; |
3927 | } | |
3928 | ||
3929 | intermediate = intermediate->backing_hd; | |
3930 | } | |
3931 | ||
3932 | *pnum = n; | |
3933 | return 0; | |
3934 | } | |
3935 | ||
045df330 AL |
3936 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3937 | { | |
3938 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3939 | return bs->backing_file; | |
3940 | else if (bs->encrypted) | |
3941 | return bs->filename; | |
3942 | else | |
3943 | return NULL; | |
3944 | } | |
3945 | ||
5fafdf24 | 3946 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3947 | char *filename, int filename_size) |
3948 | { | |
3574c608 | 3949 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3950 | } |
3951 | ||
5fafdf24 | 3952 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3953 | const uint8_t *buf, int nb_sectors) |
3954 | { | |
3955 | BlockDriver *drv = bs->drv; | |
3956 | if (!drv) | |
19cb3738 | 3957 | return -ENOMEDIUM; |
faea38e7 FB |
3958 | if (!drv->bdrv_write_compressed) |
3959 | return -ENOTSUP; | |
fbb7b4e0 KW |
3960 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3961 | return -EIO; | |
a55eb92c | 3962 | |
e4654d2d | 3963 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 3964 | |
faea38e7 FB |
3965 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3966 | } | |
3b46e624 | 3967 | |
faea38e7 FB |
3968 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3969 | { | |
3970 | BlockDriver *drv = bs->drv; | |
3971 | if (!drv) | |
19cb3738 | 3972 | return -ENOMEDIUM; |
faea38e7 FB |
3973 | if (!drv->bdrv_get_info) |
3974 | return -ENOTSUP; | |
3975 | memset(bdi, 0, sizeof(*bdi)); | |
3976 | return drv->bdrv_get_info(bs, bdi); | |
3977 | } | |
3978 | ||
eae041fe HR |
3979 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
3980 | { | |
3981 | BlockDriver *drv = bs->drv; | |
3982 | if (drv && drv->bdrv_get_specific_info) { | |
3983 | return drv->bdrv_get_specific_info(bs); | |
3984 | } | |
3985 | return NULL; | |
3986 | } | |
3987 | ||
45566e9c CH |
3988 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3989 | int64_t pos, int size) | |
cf8074b3 KW |
3990 | { |
3991 | QEMUIOVector qiov; | |
3992 | struct iovec iov = { | |
3993 | .iov_base = (void *) buf, | |
3994 | .iov_len = size, | |
3995 | }; | |
3996 | ||
3997 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3998 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3999 | } | |
4000 | ||
4001 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4002 | { |
4003 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4004 | |
4005 | if (!drv) { | |
178e08a5 | 4006 | return -ENOMEDIUM; |
cf8074b3 KW |
4007 | } else if (drv->bdrv_save_vmstate) { |
4008 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4009 | } else if (bs->file) { | |
4010 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4011 | } | |
4012 | ||
7cdb1f6d | 4013 | return -ENOTSUP; |
178e08a5 AL |
4014 | } |
4015 | ||
45566e9c CH |
4016 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4017 | int64_t pos, int size) | |
178e08a5 AL |
4018 | { |
4019 | BlockDriver *drv = bs->drv; | |
4020 | if (!drv) | |
4021 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4022 | if (drv->bdrv_load_vmstate) |
4023 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4024 | if (bs->file) | |
4025 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4026 | return -ENOTSUP; | |
178e08a5 AL |
4027 | } |
4028 | ||
8b9b0cc2 KW |
4029 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4030 | { | |
bf736fe3 | 4031 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4032 | return; |
4033 | } | |
4034 | ||
bf736fe3 | 4035 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4036 | } |
4037 | ||
4038 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4039 | const char *tag) | |
4040 | { | |
4041 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4042 | bs = bs->file; | |
4043 | } | |
4044 | ||
4045 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4046 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4047 | } | |
4048 | ||
4049 | return -ENOTSUP; | |
4050 | } | |
4051 | ||
4cc70e93 FZ |
4052 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4053 | { | |
4054 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4055 | bs = bs->file; | |
4056 | } | |
4057 | ||
4058 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4059 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4060 | } | |
4061 | ||
4062 | return -ENOTSUP; | |
4063 | } | |
4064 | ||
41c695c7 KW |
4065 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4066 | { | |
4067 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
4068 | bs = bs->file; | |
4069 | } | |
8b9b0cc2 | 4070 | |
41c695c7 KW |
4071 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4072 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4073 | } | |
4074 | ||
4075 | return -ENOTSUP; | |
4076 | } | |
4077 | ||
4078 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4079 | { | |
4080 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4081 | bs = bs->file; | |
4082 | } | |
4083 | ||
4084 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4085 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4086 | } | |
4087 | ||
4088 | return false; | |
8b9b0cc2 KW |
4089 | } |
4090 | ||
199630b6 BS |
4091 | int bdrv_is_snapshot(BlockDriverState *bs) |
4092 | { | |
4093 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4094 | } | |
4095 | ||
b1b1d783 JC |
4096 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4097 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4098 | * from a BDS as backing_file should not be done, as that may be relative to | |
4099 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4100 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4101 | const char *backing_file) | |
4102 | { | |
b1b1d783 JC |
4103 | char *filename_full = NULL; |
4104 | char *backing_file_full = NULL; | |
4105 | char *filename_tmp = NULL; | |
4106 | int is_protocol = 0; | |
4107 | BlockDriverState *curr_bs = NULL; | |
4108 | BlockDriverState *retval = NULL; | |
4109 | ||
4110 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4111 | return NULL; |
4112 | } | |
4113 | ||
b1b1d783 JC |
4114 | filename_full = g_malloc(PATH_MAX); |
4115 | backing_file_full = g_malloc(PATH_MAX); | |
4116 | filename_tmp = g_malloc(PATH_MAX); | |
4117 | ||
4118 | is_protocol = path_has_protocol(backing_file); | |
4119 | ||
4120 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4121 | ||
4122 | /* If either of the filename paths is actually a protocol, then | |
4123 | * compare unmodified paths; otherwise make paths relative */ | |
4124 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4125 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4126 | retval = curr_bs->backing_hd; | |
4127 | break; | |
4128 | } | |
e8a6bb9c | 4129 | } else { |
b1b1d783 JC |
4130 | /* If not an absolute filename path, make it relative to the current |
4131 | * image's filename path */ | |
4132 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4133 | backing_file); | |
4134 | ||
4135 | /* We are going to compare absolute pathnames */ | |
4136 | if (!realpath(filename_tmp, filename_full)) { | |
4137 | continue; | |
4138 | } | |
4139 | ||
4140 | /* We need to make sure the backing filename we are comparing against | |
4141 | * is relative to the current image filename (or absolute) */ | |
4142 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4143 | curr_bs->backing_file); | |
4144 | ||
4145 | if (!realpath(filename_tmp, backing_file_full)) { | |
4146 | continue; | |
4147 | } | |
4148 | ||
4149 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4150 | retval = curr_bs->backing_hd; | |
4151 | break; | |
4152 | } | |
e8a6bb9c MT |
4153 | } |
4154 | } | |
4155 | ||
b1b1d783 JC |
4156 | g_free(filename_full); |
4157 | g_free(backing_file_full); | |
4158 | g_free(filename_tmp); | |
4159 | return retval; | |
e8a6bb9c MT |
4160 | } |
4161 | ||
f198fd1c BC |
4162 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4163 | { | |
4164 | if (!bs->drv) { | |
4165 | return 0; | |
4166 | } | |
4167 | ||
4168 | if (!bs->backing_hd) { | |
4169 | return 0; | |
4170 | } | |
4171 | ||
4172 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4173 | } | |
4174 | ||
79fac568 JC |
4175 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
4176 | { | |
4177 | BlockDriverState *curr_bs = NULL; | |
4178 | ||
4179 | if (!bs) { | |
4180 | return NULL; | |
4181 | } | |
4182 | ||
4183 | curr_bs = bs; | |
4184 | ||
4185 | while (curr_bs->backing_hd) { | |
4186 | curr_bs = curr_bs->backing_hd; | |
4187 | } | |
4188 | return curr_bs; | |
4189 | } | |
4190 | ||
ea2384d3 | 4191 | /**************************************************************/ |
83f64091 | 4192 | /* async I/Os */ |
ea2384d3 | 4193 | |
3b69e4b9 | 4194 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 4195 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 4196 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 4197 | { |
bbf0a440 SH |
4198 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4199 | ||
d20d9b7c | 4200 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4201 | cb, opaque, false); |
ea2384d3 FB |
4202 | } |
4203 | ||
f141eafe AL |
4204 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4205 | QEMUIOVector *qiov, int nb_sectors, | |
4206 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 4207 | { |
bbf0a440 SH |
4208 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4209 | ||
d20d9b7c | 4210 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4211 | cb, opaque, true); |
83f64091 FB |
4212 | } |
4213 | ||
d5ef94d4 PB |
4214 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
4215 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
4216 | BlockDriverCompletionFunc *cb, void *opaque) | |
4217 | { | |
4218 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4219 | ||
4220 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4221 | BDRV_REQ_ZERO_WRITE | flags, | |
4222 | cb, opaque, true); | |
4223 | } | |
4224 | ||
40b4f539 KW |
4225 | |
4226 | typedef struct MultiwriteCB { | |
4227 | int error; | |
4228 | int num_requests; | |
4229 | int num_callbacks; | |
4230 | struct { | |
4231 | BlockDriverCompletionFunc *cb; | |
4232 | void *opaque; | |
4233 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4234 | } callbacks[]; |
4235 | } MultiwriteCB; | |
4236 | ||
4237 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4238 | { | |
4239 | int i; | |
4240 | ||
4241 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4242 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4243 | if (mcb->callbacks[i].free_qiov) { |
4244 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4245 | } | |
7267c094 | 4246 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4247 | } |
4248 | } | |
4249 | ||
4250 | static void multiwrite_cb(void *opaque, int ret) | |
4251 | { | |
4252 | MultiwriteCB *mcb = opaque; | |
4253 | ||
6d519a5f SH |
4254 | trace_multiwrite_cb(mcb, ret); |
4255 | ||
cb6d3ca0 | 4256 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4257 | mcb->error = ret; |
40b4f539 KW |
4258 | } |
4259 | ||
4260 | mcb->num_requests--; | |
4261 | if (mcb->num_requests == 0) { | |
de189a1b | 4262 | multiwrite_user_cb(mcb); |
7267c094 | 4263 | g_free(mcb); |
40b4f539 KW |
4264 | } |
4265 | } | |
4266 | ||
4267 | static int multiwrite_req_compare(const void *a, const void *b) | |
4268 | { | |
77be4366 CH |
4269 | const BlockRequest *req1 = a, *req2 = b; |
4270 | ||
4271 | /* | |
4272 | * Note that we can't simply subtract req2->sector from req1->sector | |
4273 | * here as that could overflow the return value. | |
4274 | */ | |
4275 | if (req1->sector > req2->sector) { | |
4276 | return 1; | |
4277 | } else if (req1->sector < req2->sector) { | |
4278 | return -1; | |
4279 | } else { | |
4280 | return 0; | |
4281 | } | |
40b4f539 KW |
4282 | } |
4283 | ||
4284 | /* | |
4285 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4286 | * requests that remain after merging. | |
4287 | */ | |
4288 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4289 | int num_reqs, MultiwriteCB *mcb) | |
4290 | { | |
4291 | int i, outidx; | |
4292 | ||
4293 | // Sort requests by start sector | |
4294 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4295 | ||
4296 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4297 | // filling up gaps with zero sectors. | |
4298 | outidx = 0; | |
4299 | for (i = 1; i < num_reqs; i++) { | |
4300 | int merge = 0; | |
4301 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4302 | ||
b6a127a1 | 4303 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4304 | if (reqs[i].sector <= oldreq_last) { |
4305 | merge = 1; | |
4306 | } | |
4307 | ||
e2a305fb CH |
4308 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4309 | merge = 0; | |
4310 | } | |
4311 | ||
40b4f539 KW |
4312 | if (merge) { |
4313 | size_t size; | |
7267c094 | 4314 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4315 | qemu_iovec_init(qiov, |
4316 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4317 | ||
4318 | // Add the first request to the merged one. If the requests are | |
4319 | // overlapping, drop the last sectors of the first request. | |
4320 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4321 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4322 | |
b6a127a1 PB |
4323 | // We should need to add any zeros between the two requests |
4324 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4325 | |
4326 | // Add the second request | |
1b093c48 | 4327 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4328 | |
cbf1dff2 | 4329 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4330 | reqs[outidx].qiov = qiov; |
4331 | ||
4332 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4333 | } else { | |
4334 | outidx++; | |
4335 | reqs[outidx].sector = reqs[i].sector; | |
4336 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4337 | reqs[outidx].qiov = reqs[i].qiov; | |
4338 | } | |
4339 | } | |
4340 | ||
4341 | return outidx + 1; | |
4342 | } | |
4343 | ||
4344 | /* | |
4345 | * Submit multiple AIO write requests at once. | |
4346 | * | |
4347 | * On success, the function returns 0 and all requests in the reqs array have | |
4348 | * been submitted. In error case this function returns -1, and any of the | |
4349 | * requests may or may not be submitted yet. In particular, this means that the | |
4350 | * callback will be called for some of the requests, for others it won't. The | |
4351 | * caller must check the error field of the BlockRequest to wait for the right | |
4352 | * callbacks (if error != 0, no callback will be called). | |
4353 | * | |
4354 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4355 | * requests. However, the fields opaque and error are left unmodified as they | |
4356 | * are used to signal failure for a single request to the caller. | |
4357 | */ | |
4358 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4359 | { | |
40b4f539 KW |
4360 | MultiwriteCB *mcb; |
4361 | int i; | |
4362 | ||
301db7c2 RH |
4363 | /* don't submit writes if we don't have a medium */ |
4364 | if (bs->drv == NULL) { | |
4365 | for (i = 0; i < num_reqs; i++) { | |
4366 | reqs[i].error = -ENOMEDIUM; | |
4367 | } | |
4368 | return -1; | |
4369 | } | |
4370 | ||
40b4f539 KW |
4371 | if (num_reqs == 0) { |
4372 | return 0; | |
4373 | } | |
4374 | ||
4375 | // Create MultiwriteCB structure | |
7267c094 | 4376 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4377 | mcb->num_requests = 0; |
4378 | mcb->num_callbacks = num_reqs; | |
4379 | ||
4380 | for (i = 0; i < num_reqs; i++) { | |
4381 | mcb->callbacks[i].cb = reqs[i].cb; | |
4382 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4383 | } | |
4384 | ||
4385 | // Check for mergable requests | |
4386 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4387 | ||
6d519a5f SH |
4388 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4389 | ||
df9309fb PB |
4390 | /* Run the aio requests. */ |
4391 | mcb->num_requests = num_reqs; | |
40b4f539 | 4392 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4393 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4394 | reqs[i].nb_sectors, reqs[i].flags, | |
4395 | multiwrite_cb, mcb, | |
4396 | true); | |
40b4f539 KW |
4397 | } |
4398 | ||
4399 | return 0; | |
40b4f539 KW |
4400 | } |
4401 | ||
83f64091 | 4402 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 4403 | { |
d7331bed | 4404 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
4405 | } |
4406 | ||
4407 | /**************************************************************/ | |
4408 | /* async block device emulation */ | |
4409 | ||
c16b5a2c CH |
4410 | typedef struct BlockDriverAIOCBSync { |
4411 | BlockDriverAIOCB common; | |
4412 | QEMUBH *bh; | |
4413 | int ret; | |
4414 | /* vector translation state */ | |
4415 | QEMUIOVector *qiov; | |
4416 | uint8_t *bounce; | |
4417 | int is_write; | |
4418 | } BlockDriverAIOCBSync; | |
4419 | ||
4420 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
4421 | { | |
b666d239 KW |
4422 | BlockDriverAIOCBSync *acb = |
4423 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 4424 | qemu_bh_delete(acb->bh); |
36afc451 | 4425 | acb->bh = NULL; |
c16b5a2c CH |
4426 | qemu_aio_release(acb); |
4427 | } | |
4428 | ||
d7331bed | 4429 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
4430 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
4431 | .cancel = bdrv_aio_cancel_em, | |
4432 | }; | |
4433 | ||
ce1a14dc | 4434 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4435 | { |
ce1a14dc | 4436 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4437 | |
f141eafe | 4438 | if (!acb->is_write) |
03396148 | 4439 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 4440 | qemu_vfree(acb->bounce); |
ce1a14dc | 4441 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4442 | qemu_bh_delete(acb->bh); |
36afc451 | 4443 | acb->bh = NULL; |
ce1a14dc | 4444 | qemu_aio_release(acb); |
83f64091 | 4445 | } |
beac80cd | 4446 | |
f141eafe AL |
4447 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4448 | int64_t sector_num, | |
4449 | QEMUIOVector *qiov, | |
4450 | int nb_sectors, | |
4451 | BlockDriverCompletionFunc *cb, | |
4452 | void *opaque, | |
4453 | int is_write) | |
4454 | ||
83f64091 | 4455 | { |
ce1a14dc | 4456 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4457 | |
d7331bed | 4458 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4459 | acb->is_write = is_write; |
4460 | acb->qiov = qiov; | |
e268ca52 | 4461 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 4462 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
4463 | |
4464 | if (is_write) { | |
d5e6b161 | 4465 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4466 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4467 | } else { |
1ed20acf | 4468 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4469 | } |
4470 | ||
ce1a14dc | 4471 | qemu_bh_schedule(acb->bh); |
f141eafe | 4472 | |
ce1a14dc | 4473 | return &acb->common; |
beac80cd FB |
4474 | } |
4475 | ||
f141eafe AL |
4476 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4477 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4478 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4479 | { |
f141eafe AL |
4480 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4481 | } | |
83f64091 | 4482 | |
f141eafe AL |
4483 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4484 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4485 | BlockDriverCompletionFunc *cb, void *opaque) | |
4486 | { | |
4487 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4488 | } |
beac80cd | 4489 | |
68485420 KW |
4490 | |
4491 | typedef struct BlockDriverAIOCBCoroutine { | |
4492 | BlockDriverAIOCB common; | |
4493 | BlockRequest req; | |
4494 | bool is_write; | |
d318aea9 | 4495 | bool *done; |
68485420 KW |
4496 | QEMUBH* bh; |
4497 | } BlockDriverAIOCBCoroutine; | |
4498 | ||
4499 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
4500 | { | |
d318aea9 KW |
4501 | BlockDriverAIOCBCoroutine *acb = |
4502 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
4503 | bool done = false; | |
4504 | ||
4505 | acb->done = &done; | |
4506 | while (!done) { | |
4507 | qemu_aio_wait(); | |
4508 | } | |
68485420 KW |
4509 | } |
4510 | ||
d7331bed | 4511 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
4512 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
4513 | .cancel = bdrv_aio_co_cancel_em, | |
4514 | }; | |
4515 | ||
35246a68 | 4516 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4517 | { |
4518 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4519 | ||
4520 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
4521 | |
4522 | if (acb->done) { | |
4523 | *acb->done = true; | |
4524 | } | |
4525 | ||
68485420 KW |
4526 | qemu_bh_delete(acb->bh); |
4527 | qemu_aio_release(acb); | |
4528 | } | |
4529 | ||
b2a61371 SH |
4530 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4531 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4532 | { | |
4533 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4534 | BlockDriverState *bs = acb->common.bs; | |
4535 | ||
4536 | if (!acb->is_write) { | |
4537 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4538 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4539 | } else { |
4540 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4541 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4542 | } |
4543 | ||
35246a68 | 4544 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
4545 | qemu_bh_schedule(acb->bh); |
4546 | } | |
4547 | ||
68485420 KW |
4548 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4549 | int64_t sector_num, | |
4550 | QEMUIOVector *qiov, | |
4551 | int nb_sectors, | |
d20d9b7c | 4552 | BdrvRequestFlags flags, |
68485420 KW |
4553 | BlockDriverCompletionFunc *cb, |
4554 | void *opaque, | |
8c5873d6 | 4555 | bool is_write) |
68485420 KW |
4556 | { |
4557 | Coroutine *co; | |
4558 | BlockDriverAIOCBCoroutine *acb; | |
4559 | ||
d7331bed | 4560 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4561 | acb->req.sector = sector_num; |
4562 | acb->req.nb_sectors = nb_sectors; | |
4563 | acb->req.qiov = qiov; | |
d20d9b7c | 4564 | acb->req.flags = flags; |
68485420 | 4565 | acb->is_write = is_write; |
d318aea9 | 4566 | acb->done = NULL; |
68485420 | 4567 | |
8c5873d6 | 4568 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4569 | qemu_coroutine_enter(co, acb); |
4570 | ||
4571 | return &acb->common; | |
4572 | } | |
4573 | ||
07f07615 | 4574 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4575 | { |
07f07615 PB |
4576 | BlockDriverAIOCBCoroutine *acb = opaque; |
4577 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4578 | |
07f07615 PB |
4579 | acb->req.error = bdrv_co_flush(bs); |
4580 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 4581 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4582 | } |
4583 | ||
07f07615 | 4584 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4585 | BlockDriverCompletionFunc *cb, void *opaque) |
4586 | { | |
07f07615 | 4587 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4588 | |
07f07615 PB |
4589 | Coroutine *co; |
4590 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4591 | |
d7331bed | 4592 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
4593 | acb->done = NULL; |
4594 | ||
07f07615 PB |
4595 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4596 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4597 | |
016f5cf6 AG |
4598 | return &acb->common; |
4599 | } | |
4600 | ||
4265d620 PB |
4601 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4602 | { | |
4603 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4604 | BlockDriverState *bs = acb->common.bs; | |
4605 | ||
4606 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
4607 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
4608 | qemu_bh_schedule(acb->bh); | |
4609 | } | |
4610 | ||
4611 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4612 | int64_t sector_num, int nb_sectors, | |
4613 | BlockDriverCompletionFunc *cb, void *opaque) | |
4614 | { | |
4615 | Coroutine *co; | |
4616 | BlockDriverAIOCBCoroutine *acb; | |
4617 | ||
4618 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4619 | ||
d7331bed | 4620 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4621 | acb->req.sector = sector_num; |
4622 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4623 | acb->done = NULL; |
4265d620 PB |
4624 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4625 | qemu_coroutine_enter(co, acb); | |
4626 | ||
4627 | return &acb->common; | |
4628 | } | |
4629 | ||
ea2384d3 FB |
4630 | void bdrv_init(void) |
4631 | { | |
5efa9d5a | 4632 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4633 | } |
ce1a14dc | 4634 | |
eb852011 MA |
4635 | void bdrv_init_with_whitelist(void) |
4636 | { | |
4637 | use_bdrv_whitelist = 1; | |
4638 | bdrv_init(); | |
4639 | } | |
4640 | ||
d7331bed | 4641 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4642 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4643 | { |
ce1a14dc PB |
4644 | BlockDriverAIOCB *acb; |
4645 | ||
d7331bed SH |
4646 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4647 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4648 | acb->bs = bs; |
4649 | acb->cb = cb; | |
4650 | acb->opaque = opaque; | |
4651 | return acb; | |
4652 | } | |
4653 | ||
4654 | void qemu_aio_release(void *p) | |
4655 | { | |
d37c975f | 4656 | BlockDriverAIOCB *acb = p; |
d7331bed | 4657 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4658 | } |
19cb3738 | 4659 | |
f9f05dc5 KW |
4660 | /**************************************************************/ |
4661 | /* Coroutine block device emulation */ | |
4662 | ||
4663 | typedef struct CoroutineIOCompletion { | |
4664 | Coroutine *coroutine; | |
4665 | int ret; | |
4666 | } CoroutineIOCompletion; | |
4667 | ||
4668 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4669 | { | |
4670 | CoroutineIOCompletion *co = opaque; | |
4671 | ||
4672 | co->ret = ret; | |
4673 | qemu_coroutine_enter(co->coroutine, NULL); | |
4674 | } | |
4675 | ||
4676 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4677 | int nb_sectors, QEMUIOVector *iov, | |
4678 | bool is_write) | |
4679 | { | |
4680 | CoroutineIOCompletion co = { | |
4681 | .coroutine = qemu_coroutine_self(), | |
4682 | }; | |
4683 | BlockDriverAIOCB *acb; | |
4684 | ||
4685 | if (is_write) { | |
a652d160 SH |
4686 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4687 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4688 | } else { |
a652d160 SH |
4689 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4690 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4691 | } |
4692 | ||
59370aaa | 4693 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4694 | if (!acb) { |
4695 | return -EIO; | |
4696 | } | |
4697 | qemu_coroutine_yield(); | |
4698 | ||
4699 | return co.ret; | |
4700 | } | |
4701 | ||
4702 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4703 | int64_t sector_num, int nb_sectors, | |
4704 | QEMUIOVector *iov) | |
4705 | { | |
4706 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4707 | } | |
4708 | ||
4709 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4710 | int64_t sector_num, int nb_sectors, | |
4711 | QEMUIOVector *iov) | |
4712 | { | |
4713 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4714 | } | |
4715 | ||
07f07615 | 4716 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4717 | { |
07f07615 PB |
4718 | RwCo *rwco = opaque; |
4719 | ||
4720 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4721 | } | |
4722 | ||
4723 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4724 | { | |
eb489bb1 KW |
4725 | int ret; |
4726 | ||
29cdb251 | 4727 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4728 | return 0; |
eb489bb1 KW |
4729 | } |
4730 | ||
ca716364 | 4731 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4732 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4733 | if (bs->drv->bdrv_co_flush_to_os) { |
4734 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4735 | if (ret < 0) { | |
4736 | return ret; | |
4737 | } | |
4738 | } | |
4739 | ||
ca716364 KW |
4740 | /* But don't actually force it to the disk with cache=unsafe */ |
4741 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4742 | goto flush_parent; |
ca716364 KW |
4743 | } |
4744 | ||
bf736fe3 | 4745 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4746 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4747 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4748 | } else if (bs->drv->bdrv_aio_flush) { |
4749 | BlockDriverAIOCB *acb; | |
4750 | CoroutineIOCompletion co = { | |
4751 | .coroutine = qemu_coroutine_self(), | |
4752 | }; | |
4753 | ||
4754 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4755 | if (acb == NULL) { | |
29cdb251 | 4756 | ret = -EIO; |
07f07615 PB |
4757 | } else { |
4758 | qemu_coroutine_yield(); | |
29cdb251 | 4759 | ret = co.ret; |
07f07615 | 4760 | } |
07f07615 PB |
4761 | } else { |
4762 | /* | |
4763 | * Some block drivers always operate in either writethrough or unsafe | |
4764 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4765 | * know how the server works (because the behaviour is hardcoded or | |
4766 | * depends on server-side configuration), so we can't ensure that | |
4767 | * everything is safe on disk. Returning an error doesn't work because | |
4768 | * that would break guests even if the server operates in writethrough | |
4769 | * mode. | |
4770 | * | |
4771 | * Let's hope the user knows what he's doing. | |
4772 | */ | |
29cdb251 | 4773 | ret = 0; |
07f07615 | 4774 | } |
29cdb251 PB |
4775 | if (ret < 0) { |
4776 | return ret; | |
4777 | } | |
4778 | ||
4779 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4780 | * in the case of cache=unsafe, so there are no useless flushes. | |
4781 | */ | |
d4c82329 | 4782 | flush_parent: |
29cdb251 | 4783 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4784 | } |
4785 | ||
0f15423c AL |
4786 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4787 | { | |
4788 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4789 | bs->drv->bdrv_invalidate_cache(bs); | |
4790 | } | |
4791 | } | |
4792 | ||
4793 | void bdrv_invalidate_cache_all(void) | |
4794 | { | |
4795 | BlockDriverState *bs; | |
4796 | ||
dc364f4c | 4797 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
0f15423c AL |
4798 | bdrv_invalidate_cache(bs); |
4799 | } | |
4800 | } | |
4801 | ||
07789269 BC |
4802 | void bdrv_clear_incoming_migration_all(void) |
4803 | { | |
4804 | BlockDriverState *bs; | |
4805 | ||
dc364f4c | 4806 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
07789269 BC |
4807 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
4808 | } | |
4809 | } | |
4810 | ||
07f07615 PB |
4811 | int bdrv_flush(BlockDriverState *bs) |
4812 | { | |
4813 | Coroutine *co; | |
4814 | RwCo rwco = { | |
4815 | .bs = bs, | |
4816 | .ret = NOT_DONE, | |
e7a8a783 | 4817 | }; |
e7a8a783 | 4818 | |
07f07615 PB |
4819 | if (qemu_in_coroutine()) { |
4820 | /* Fast-path if already in coroutine context */ | |
4821 | bdrv_flush_co_entry(&rwco); | |
4822 | } else { | |
4823 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4824 | qemu_coroutine_enter(co, &rwco); | |
4825 | while (rwco.ret == NOT_DONE) { | |
4826 | qemu_aio_wait(); | |
4827 | } | |
e7a8a783 | 4828 | } |
07f07615 PB |
4829 | |
4830 | return rwco.ret; | |
e7a8a783 KW |
4831 | } |
4832 | ||
775aa8b6 KW |
4833 | typedef struct DiscardCo { |
4834 | BlockDriverState *bs; | |
4835 | int64_t sector_num; | |
4836 | int nb_sectors; | |
4837 | int ret; | |
4838 | } DiscardCo; | |
4265d620 PB |
4839 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4840 | { | |
775aa8b6 | 4841 | DiscardCo *rwco = opaque; |
4265d620 PB |
4842 | |
4843 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4844 | } | |
4845 | ||
6f14da52 PL |
4846 | /* if no limit is specified in the BlockLimits use a default |
4847 | * of 32768 512-byte sectors (16 MiB) per request. | |
4848 | */ | |
4849 | #define MAX_DISCARD_DEFAULT 32768 | |
4850 | ||
4265d620 PB |
4851 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
4852 | int nb_sectors) | |
4853 | { | |
d51e9fe5 PB |
4854 | int max_discard; |
4855 | ||
4265d620 PB |
4856 | if (!bs->drv) { |
4857 | return -ENOMEDIUM; | |
4858 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4859 | return -EIO; | |
4860 | } else if (bs->read_only) { | |
4861 | return -EROFS; | |
df702c9b PB |
4862 | } |
4863 | ||
e4654d2d | 4864 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 4865 | |
9e8f1835 PB |
4866 | /* Do nothing if disabled. */ |
4867 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4868 | return 0; | |
4869 | } | |
4870 | ||
d51e9fe5 PB |
4871 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
4872 | return 0; | |
4873 | } | |
6f14da52 | 4874 | |
d51e9fe5 PB |
4875 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
4876 | while (nb_sectors > 0) { | |
4877 | int ret; | |
4878 | int num = nb_sectors; | |
6f14da52 | 4879 | |
d51e9fe5 PB |
4880 | /* align request */ |
4881 | if (bs->bl.discard_alignment && | |
4882 | num >= bs->bl.discard_alignment && | |
4883 | sector_num % bs->bl.discard_alignment) { | |
4884 | if (num > bs->bl.discard_alignment) { | |
4885 | num = bs->bl.discard_alignment; | |
6f14da52 | 4886 | } |
d51e9fe5 PB |
4887 | num -= sector_num % bs->bl.discard_alignment; |
4888 | } | |
6f14da52 | 4889 | |
d51e9fe5 PB |
4890 | /* limit request size */ |
4891 | if (num > max_discard) { | |
4892 | num = max_discard; | |
4893 | } | |
6f14da52 | 4894 | |
d51e9fe5 | 4895 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 4896 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
4897 | } else { |
4898 | BlockDriverAIOCB *acb; | |
4899 | CoroutineIOCompletion co = { | |
4900 | .coroutine = qemu_coroutine_self(), | |
4901 | }; | |
4902 | ||
4903 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4904 | bdrv_co_io_em_complete, &co); | |
4905 | if (acb == NULL) { | |
4906 | return -EIO; | |
4907 | } else { | |
4908 | qemu_coroutine_yield(); | |
4909 | ret = co.ret; | |
6f14da52 | 4910 | } |
6f14da52 | 4911 | } |
7ce21016 | 4912 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 4913 | return ret; |
4265d620 | 4914 | } |
d51e9fe5 PB |
4915 | |
4916 | sector_num += num; | |
4917 | nb_sectors -= num; | |
4265d620 | 4918 | } |
d51e9fe5 | 4919 | return 0; |
4265d620 PB |
4920 | } |
4921 | ||
4922 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4923 | { | |
4924 | Coroutine *co; | |
775aa8b6 | 4925 | DiscardCo rwco = { |
4265d620 PB |
4926 | .bs = bs, |
4927 | .sector_num = sector_num, | |
4928 | .nb_sectors = nb_sectors, | |
4929 | .ret = NOT_DONE, | |
4930 | }; | |
4931 | ||
4932 | if (qemu_in_coroutine()) { | |
4933 | /* Fast-path if already in coroutine context */ | |
4934 | bdrv_discard_co_entry(&rwco); | |
4935 | } else { | |
4936 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4937 | qemu_coroutine_enter(co, &rwco); | |
4938 | while (rwco.ret == NOT_DONE) { | |
4939 | qemu_aio_wait(); | |
4940 | } | |
4941 | } | |
4942 | ||
4943 | return rwco.ret; | |
4944 | } | |
4945 | ||
19cb3738 FB |
4946 | /**************************************************************/ |
4947 | /* removable device support */ | |
4948 | ||
4949 | /** | |
4950 | * Return TRUE if the media is present | |
4951 | */ | |
4952 | int bdrv_is_inserted(BlockDriverState *bs) | |
4953 | { | |
4954 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4955 | |
19cb3738 FB |
4956 | if (!drv) |
4957 | return 0; | |
4958 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4959 | return 1; |
4960 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4961 | } |
4962 | ||
4963 | /** | |
8e49ca46 MA |
4964 | * Return whether the media changed since the last call to this |
4965 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4966 | */ |
4967 | int bdrv_media_changed(BlockDriverState *bs) | |
4968 | { | |
4969 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4970 | |
8e49ca46 MA |
4971 | if (drv && drv->bdrv_media_changed) { |
4972 | return drv->bdrv_media_changed(bs); | |
4973 | } | |
4974 | return -ENOTSUP; | |
19cb3738 FB |
4975 | } |
4976 | ||
4977 | /** | |
4978 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4979 | */ | |
f36f3949 | 4980 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4981 | { |
4982 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4983 | |
822e1cd1 MA |
4984 | if (drv && drv->bdrv_eject) { |
4985 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4986 | } |
6f382ed2 LC |
4987 | |
4988 | if (bs->device_name[0] != '\0') { | |
4989 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4990 | } | |
19cb3738 FB |
4991 | } |
4992 | ||
19cb3738 FB |
4993 | /** |
4994 | * Lock or unlock the media (if it is locked, the user won't be able | |
4995 | * to eject it manually). | |
4996 | */ | |
025e849a | 4997 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4998 | { |
4999 | BlockDriver *drv = bs->drv; | |
5000 | ||
025e849a | 5001 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5002 | |
025e849a MA |
5003 | if (drv && drv->bdrv_lock_medium) { |
5004 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5005 | } |
5006 | } | |
985a03b0 TS |
5007 | |
5008 | /* needed for generic scsi interface */ | |
5009 | ||
5010 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5011 | { | |
5012 | BlockDriver *drv = bs->drv; | |
5013 | ||
5014 | if (drv && drv->bdrv_ioctl) | |
5015 | return drv->bdrv_ioctl(bs, req, buf); | |
5016 | return -ENOTSUP; | |
5017 | } | |
7d780669 | 5018 | |
221f715d AL |
5019 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
5020 | unsigned long int req, void *buf, | |
5021 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 5022 | { |
221f715d | 5023 | BlockDriver *drv = bs->drv; |
7d780669 | 5024 | |
221f715d AL |
5025 | if (drv && drv->bdrv_aio_ioctl) |
5026 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5027 | return NULL; | |
7d780669 | 5028 | } |
e268ca52 | 5029 | |
1b7fd729 | 5030 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5031 | { |
1b7fd729 | 5032 | bs->guest_block_size = align; |
7b6f9300 | 5033 | } |
7cd1e32a | 5034 | |
e268ca52 AL |
5035 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5036 | { | |
339064d5 | 5037 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5038 | } |
7cd1e32a | 5039 | |
c53b1c51 SH |
5040 | /* |
5041 | * Check if all memory in this vector is sector aligned. | |
5042 | */ | |
5043 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5044 | { | |
5045 | int i; | |
339064d5 | 5046 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5047 | |
5048 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5049 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5050 | return false; |
1ff735bd | 5051 | } |
339064d5 | 5052 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5053 | return false; |
c53b1c51 SH |
5054 | } |
5055 | } | |
5056 | ||
5057 | return true; | |
5058 | } | |
5059 | ||
e4654d2d | 5060 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity) |
7cd1e32a LS |
5061 | { |
5062 | int64_t bitmap_size; | |
e4654d2d | 5063 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 5064 | |
50717e94 PB |
5065 | assert((granularity & (granularity - 1)) == 0); |
5066 | ||
e4654d2d FZ |
5067 | granularity >>= BDRV_SECTOR_BITS; |
5068 | assert(granularity); | |
5069 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
5070 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); | |
5071 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
5072 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
5073 | return bitmap; | |
5074 | } | |
5075 | ||
5076 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
5077 | { | |
5078 | BdrvDirtyBitmap *bm, *next; | |
5079 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5080 | if (bm == bitmap) { | |
5081 | QLIST_REMOVE(bitmap, list); | |
5082 | hbitmap_free(bitmap->bitmap); | |
5083 | g_free(bitmap); | |
5084 | return; | |
a55eb92c | 5085 | } |
7cd1e32a LS |
5086 | } |
5087 | } | |
5088 | ||
21b56835 FZ |
5089 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5090 | { | |
5091 | BdrvDirtyBitmap *bm; | |
5092 | BlockDirtyInfoList *list = NULL; | |
5093 | BlockDirtyInfoList **plist = &list; | |
5094 | ||
5095 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5096 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); | |
5097 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); | |
5098 | info->count = bdrv_get_dirty_count(bs, bm); | |
5099 | info->granularity = | |
5100 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
5101 | entry->value = info; | |
5102 | *plist = entry; | |
5103 | plist = &entry->next; | |
5104 | } | |
5105 | ||
5106 | return list; | |
5107 | } | |
5108 | ||
e4654d2d | 5109 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5110 | { |
e4654d2d FZ |
5111 | if (bitmap) { |
5112 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5113 | } else { |
5114 | return 0; | |
5115 | } | |
5116 | } | |
5117 | ||
e4654d2d FZ |
5118 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
5119 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 5120 | { |
e4654d2d | 5121 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5122 | } |
5123 | ||
5124 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
5125 | int nr_sectors) | |
5126 | { | |
e4654d2d FZ |
5127 | BdrvDirtyBitmap *bitmap; |
5128 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5129 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5130 | } | |
1755da16 PB |
5131 | } |
5132 | ||
e4654d2d | 5133 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 5134 | { |
e4654d2d FZ |
5135 | BdrvDirtyBitmap *bitmap; |
5136 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5137 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5138 | } | |
7cd1e32a | 5139 | } |
aaa0eb75 | 5140 | |
e4654d2d | 5141 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5142 | { |
e4654d2d | 5143 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5144 | } |
f88e1a42 | 5145 | |
9fcb0251 FZ |
5146 | /* Get a reference to bs */ |
5147 | void bdrv_ref(BlockDriverState *bs) | |
5148 | { | |
5149 | bs->refcnt++; | |
5150 | } | |
5151 | ||
5152 | /* Release a previously grabbed reference to bs. | |
5153 | * If after releasing, reference count is zero, the BlockDriverState is | |
5154 | * deleted. */ | |
5155 | void bdrv_unref(BlockDriverState *bs) | |
5156 | { | |
5157 | assert(bs->refcnt > 0); | |
5158 | if (--bs->refcnt == 0) { | |
5159 | bdrv_delete(bs); | |
5160 | } | |
5161 | } | |
5162 | ||
db593f25 MT |
5163 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
5164 | { | |
5165 | assert(bs->in_use != in_use); | |
5166 | bs->in_use = in_use; | |
5167 | } | |
5168 | ||
5169 | int bdrv_in_use(BlockDriverState *bs) | |
5170 | { | |
5171 | return bs->in_use; | |
5172 | } | |
5173 | ||
28a7282a LC |
5174 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5175 | { | |
d6bf279e | 5176 | bs->iostatus_enabled = true; |
58e21ef5 | 5177 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5178 | } |
5179 | ||
5180 | /* The I/O status is only enabled if the drive explicitly | |
5181 | * enables it _and_ the VM is configured to stop on errors */ | |
5182 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5183 | { | |
d6bf279e | 5184 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5185 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5186 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5187 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5188 | } |
5189 | ||
5190 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5191 | { | |
d6bf279e | 5192 | bs->iostatus_enabled = false; |
28a7282a LC |
5193 | } |
5194 | ||
5195 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5196 | { | |
5197 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5198 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5199 | if (bs->job) { |
5200 | block_job_iostatus_reset(bs->job); | |
5201 | } | |
28a7282a LC |
5202 | } |
5203 | } | |
5204 | ||
28a7282a LC |
5205 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5206 | { | |
3e1caa5f PB |
5207 | assert(bdrv_iostatus_is_enabled(bs)); |
5208 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5209 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5210 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5211 | } |
5212 | } | |
5213 | ||
a597e79c CH |
5214 | void |
5215 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
5216 | enum BlockAcctType type) | |
5217 | { | |
5218 | assert(type < BDRV_MAX_IOTYPE); | |
5219 | ||
5220 | cookie->bytes = bytes; | |
c488c7f6 | 5221 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
5222 | cookie->type = type; |
5223 | } | |
5224 | ||
5225 | void | |
5226 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
5227 | { | |
5228 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
5229 | ||
5230 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
5231 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 5232 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
5233 | } |
5234 | ||
d92ada22 LC |
5235 | void bdrv_img_create(const char *filename, const char *fmt, |
5236 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5237 | char *options, uint64_t img_size, int flags, |
5238 | Error **errp, bool quiet) | |
f88e1a42 JS |
5239 | { |
5240 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 5241 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 | 5242 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5243 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5244 | Error *local_err = NULL; |
f88e1a42 JS |
5245 | int ret = 0; |
5246 | ||
5247 | /* Find driver and parse its options */ | |
5248 | drv = bdrv_find_format(fmt); | |
5249 | if (!drv) { | |
71c79813 | 5250 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5251 | return; |
f88e1a42 JS |
5252 | } |
5253 | ||
98289620 | 5254 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 5255 | if (!proto_drv) { |
71c79813 | 5256 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 5257 | return; |
f88e1a42 JS |
5258 | } |
5259 | ||
5260 | create_options = append_option_parameters(create_options, | |
5261 | drv->create_options); | |
5262 | create_options = append_option_parameters(create_options, | |
5263 | proto_drv->create_options); | |
5264 | ||
5265 | /* Create parameter list with default values */ | |
5266 | param = parse_option_parameters("", create_options, param); | |
5267 | ||
5268 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
5269 | ||
5270 | /* Parse -o options */ | |
5271 | if (options) { | |
5272 | param = parse_option_parameters(options, create_options, param); | |
5273 | if (param == NULL) { | |
71c79813 | 5274 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
5275 | goto out; |
5276 | } | |
5277 | } | |
5278 | ||
5279 | if (base_filename) { | |
5280 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
5281 | base_filename)) { | |
71c79813 LC |
5282 | error_setg(errp, "Backing file not supported for file format '%s'", |
5283 | fmt); | |
f88e1a42 JS |
5284 | goto out; |
5285 | } | |
5286 | } | |
5287 | ||
5288 | if (base_fmt) { | |
5289 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
5290 | error_setg(errp, "Backing file format not supported for file " |
5291 | "format '%s'", fmt); | |
f88e1a42 JS |
5292 | goto out; |
5293 | } | |
5294 | } | |
5295 | ||
792da93a JS |
5296 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
5297 | if (backing_file && backing_file->value.s) { | |
5298 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
5299 | error_setg(errp, "Error: Trying to create an image with the " |
5300 | "same filename as the backing file"); | |
792da93a JS |
5301 | goto out; |
5302 | } | |
5303 | } | |
5304 | ||
f88e1a42 JS |
5305 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
5306 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
5307 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
5308 | if (!backing_drv) { | |
71c79813 LC |
5309 | error_setg(errp, "Unknown backing file format '%s'", |
5310 | backing_fmt->value.s); | |
f88e1a42 JS |
5311 | goto out; |
5312 | } | |
5313 | } | |
5314 | ||
5315 | // The size for the image must always be specified, with one exception: | |
5316 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
5317 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
5318 | if (size && size->value.n == -1) { | |
f88e1a42 | 5319 | if (backing_file && backing_file->value.s) { |
66f6b814 | 5320 | BlockDriverState *bs; |
f88e1a42 | 5321 | uint64_t size; |
f88e1a42 | 5322 | char buf[32]; |
63090dac PB |
5323 | int back_flags; |
5324 | ||
5325 | /* backing files always opened read-only */ | |
5326 | back_flags = | |
5327 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5328 | |
f67503e5 | 5329 | bs = NULL; |
ddf5636d | 5330 | ret = bdrv_open(&bs, backing_file->value.s, NULL, NULL, back_flags, |
cc84d90f | 5331 | backing_drv, &local_err); |
f88e1a42 | 5332 | if (ret < 0) { |
cc84d90f HR |
5333 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
5334 | backing_file->value.s, | |
5335 | error_get_pretty(local_err)); | |
5336 | error_free(local_err); | |
5337 | local_err = NULL; | |
f88e1a42 JS |
5338 | goto out; |
5339 | } | |
5340 | bdrv_get_geometry(bs, &size); | |
5341 | size *= 512; | |
5342 | ||
5343 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
5344 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
66f6b814 HR |
5345 | |
5346 | bdrv_unref(bs); | |
f88e1a42 | 5347 | } else { |
71c79813 | 5348 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5349 | goto out; |
5350 | } | |
5351 | } | |
5352 | ||
f382d43a MR |
5353 | if (!quiet) { |
5354 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
5355 | print_option_parameters(param); | |
5356 | puts(""); | |
5357 | } | |
cc84d90f HR |
5358 | ret = bdrv_create(drv, filename, param, &local_err); |
5359 | if (ret == -EFBIG) { | |
5360 | /* This is generally a better message than whatever the driver would | |
5361 | * deliver (especially because of the cluster_size_hint), since that | |
5362 | * is most probably not much different from "image too large". */ | |
5363 | const char *cluster_size_hint = ""; | |
5364 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
5365 | cluster_size_hint = " (try using a larger cluster size)"; | |
f88e1a42 | 5366 | } |
cc84d90f HR |
5367 | error_setg(errp, "The image size is too large for file format '%s'" |
5368 | "%s", fmt, cluster_size_hint); | |
5369 | error_free(local_err); | |
5370 | local_err = NULL; | |
f88e1a42 JS |
5371 | } |
5372 | ||
5373 | out: | |
5374 | free_option_parameters(create_options); | |
5375 | free_option_parameters(param); | |
5376 | ||
84d18f06 | 5377 | if (local_err) { |
cc84d90f HR |
5378 | error_propagate(errp, local_err); |
5379 | } | |
f88e1a42 | 5380 | } |
85d126f3 SH |
5381 | |
5382 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5383 | { | |
5384 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
5385 | return qemu_get_aio_context(); | |
5386 | } | |
d616b224 SH |
5387 | |
5388 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
5389 | NotifierWithReturn *notifier) | |
5390 | { | |
5391 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5392 | } | |
6f176b48 HR |
5393 | |
5394 | int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options) | |
5395 | { | |
5396 | if (bs->drv->bdrv_amend_options == NULL) { | |
5397 | return -ENOTSUP; | |
5398 | } | |
5399 | return bs->drv->bdrv_amend_options(bs, options); | |
5400 | } | |
f6186f49 | 5401 | |
212a5a8f BC |
5402 | /* Used to recurse on single child block filters. |
5403 | * Single child block filter will store their child in bs->file. | |
5404 | */ | |
5405 | bool bdrv_generic_is_first_non_filter(BlockDriverState *bs, | |
5406 | BlockDriverState *candidate) | |
f6186f49 | 5407 | { |
212a5a8f BC |
5408 | if (!bs->drv) { |
5409 | return false; | |
5410 | } | |
5411 | ||
5412 | if (!bs->drv->authorizations[BS_IS_A_FILTER]) { | |
5413 | if (bs == candidate) { | |
5414 | return true; | |
5415 | } else { | |
5416 | return false; | |
5417 | } | |
5418 | } | |
5419 | ||
5420 | if (!bs->drv->authorizations[BS_FILTER_PASS_DOWN]) { | |
5421 | return false; | |
f6186f49 BC |
5422 | } |
5423 | ||
212a5a8f BC |
5424 | if (!bs->file) { |
5425 | return false; | |
5426 | } | |
5427 | ||
5428 | return bdrv_recurse_is_first_non_filter(bs->file, candidate); | |
5429 | } | |
5430 | ||
5431 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, | |
5432 | BlockDriverState *candidate) | |
5433 | { | |
5434 | if (bs->drv && bs->drv->bdrv_recurse_is_first_non_filter) { | |
5435 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); | |
f6186f49 BC |
5436 | } |
5437 | ||
212a5a8f | 5438 | return bdrv_generic_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5439 | } |
5440 | ||
212a5a8f BC |
5441 | /* This function checks if the candidate is the first non filter bs down it's |
5442 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5443 | * from the top. Some filters can choose not to pass down the recursion. | |
5444 | */ | |
5445 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5446 | { |
212a5a8f BC |
5447 | BlockDriverState *bs; |
5448 | ||
5449 | /* walk down the bs forest recursively */ | |
5450 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5451 | bool perm; | |
5452 | ||
e6dc8a1f | 5453 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
5454 | |
5455 | /* candidate is the first non filter */ | |
5456 | if (perm) { | |
5457 | return true; | |
5458 | } | |
5459 | } | |
5460 | ||
5461 | return false; | |
f6186f49 | 5462 | } |