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Commit | Line | Data |
---|---|---|
fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
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); | |
c5fbe571 | 73 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
74 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
75 | BdrvRequestFlags flags); | |
1c9805a3 | 76 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
77 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
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, |
cc0681c4 BC |
195 | int nb_sectors, |
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 BC |
207 | /* the IO will be executed, do the accounting */ |
208 | throttle_account(&bs->throttle_state, | |
209 | is_write, | |
210 | nb_sectors * BDRV_SECTOR_SIZE); | |
98f90dba | 211 | |
cc0681c4 BC |
212 | /* if the next request must wait -> do nothing */ |
213 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
214 | return; | |
98f90dba ZYW |
215 | } |
216 | ||
cc0681c4 BC |
217 | /* else queue next request for execution */ |
218 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
219 | } |
220 | ||
9e0b22f4 SH |
221 | /* check if the path starts with "<protocol>:" */ |
222 | static int path_has_protocol(const char *path) | |
223 | { | |
947995c0 PB |
224 | const char *p; |
225 | ||
9e0b22f4 SH |
226 | #ifdef _WIN32 |
227 | if (is_windows_drive(path) || | |
228 | is_windows_drive_prefix(path)) { | |
229 | return 0; | |
230 | } | |
947995c0 PB |
231 | p = path + strcspn(path, ":/\\"); |
232 | #else | |
233 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
234 | #endif |
235 | ||
947995c0 | 236 | return *p == ':'; |
9e0b22f4 SH |
237 | } |
238 | ||
83f64091 | 239 | int path_is_absolute(const char *path) |
3b0d4f61 | 240 | { |
21664424 FB |
241 | #ifdef _WIN32 |
242 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 243 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 244 | return 1; |
f53f4da9 PB |
245 | } |
246 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 247 | #else |
f53f4da9 | 248 | return (*path == '/'); |
3b9f94e1 | 249 | #endif |
3b0d4f61 FB |
250 | } |
251 | ||
83f64091 FB |
252 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
253 | path to it by considering it is relative to base_path. URL are | |
254 | supported. */ | |
255 | void path_combine(char *dest, int dest_size, | |
256 | const char *base_path, | |
257 | const char *filename) | |
3b0d4f61 | 258 | { |
83f64091 FB |
259 | const char *p, *p1; |
260 | int len; | |
261 | ||
262 | if (dest_size <= 0) | |
263 | return; | |
264 | if (path_is_absolute(filename)) { | |
265 | pstrcpy(dest, dest_size, filename); | |
266 | } else { | |
267 | p = strchr(base_path, ':'); | |
268 | if (p) | |
269 | p++; | |
270 | else | |
271 | p = base_path; | |
3b9f94e1 FB |
272 | p1 = strrchr(base_path, '/'); |
273 | #ifdef _WIN32 | |
274 | { | |
275 | const char *p2; | |
276 | p2 = strrchr(base_path, '\\'); | |
277 | if (!p1 || p2 > p1) | |
278 | p1 = p2; | |
279 | } | |
280 | #endif | |
83f64091 FB |
281 | if (p1) |
282 | p1++; | |
283 | else | |
284 | p1 = base_path; | |
285 | if (p1 > p) | |
286 | p = p1; | |
287 | len = p - base_path; | |
288 | if (len > dest_size - 1) | |
289 | len = dest_size - 1; | |
290 | memcpy(dest, base_path, len); | |
291 | dest[len] = '\0'; | |
292 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 293 | } |
3b0d4f61 FB |
294 | } |
295 | ||
dc5a1371 PB |
296 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
297 | { | |
298 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
299 | pstrcpy(dest, sz, bs->backing_file); | |
300 | } else { | |
301 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
302 | } | |
303 | } | |
304 | ||
5efa9d5a | 305 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 306 | { |
8c5873d6 SH |
307 | /* Block drivers without coroutine functions need emulation */ |
308 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
309 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
310 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
311 | ||
f8c35c1d SH |
312 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
313 | * the block driver lacks aio we need to emulate that too. | |
314 | */ | |
f9f05dc5 KW |
315 | if (!bdrv->bdrv_aio_readv) { |
316 | /* add AIO emulation layer */ | |
317 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
318 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 319 | } |
83f64091 | 320 | } |
b2e12bc6 | 321 | |
8a22f02a | 322 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 323 | } |
b338082b FB |
324 | |
325 | /* create a new block device (by default it is empty) */ | |
326 | BlockDriverState *bdrv_new(const char *device_name) | |
327 | { | |
1b7bdbc1 | 328 | BlockDriverState *bs; |
b338082b | 329 | |
7267c094 | 330 | bs = g_malloc0(sizeof(BlockDriverState)); |
e4654d2d | 331 | QLIST_INIT(&bs->dirty_bitmaps); |
b338082b | 332 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 333 | if (device_name[0] != '\0') { |
dc364f4c | 334 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
ea2384d3 | 335 | } |
28a7282a | 336 | bdrv_iostatus_disable(bs); |
d7d512f6 | 337 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 338 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
339 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
340 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 341 | bs->refcnt = 1; |
d7d512f6 | 342 | |
b338082b FB |
343 | return bs; |
344 | } | |
345 | ||
d7d512f6 PB |
346 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
347 | { | |
348 | notifier_list_add(&bs->close_notifiers, notify); | |
349 | } | |
350 | ||
ea2384d3 FB |
351 | BlockDriver *bdrv_find_format(const char *format_name) |
352 | { | |
353 | BlockDriver *drv1; | |
8a22f02a SH |
354 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
355 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 356 | return drv1; |
8a22f02a | 357 | } |
ea2384d3 FB |
358 | } |
359 | return NULL; | |
360 | } | |
361 | ||
b64ec4e4 | 362 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 363 | { |
b64ec4e4 FZ |
364 | static const char *whitelist_rw[] = { |
365 | CONFIG_BDRV_RW_WHITELIST | |
366 | }; | |
367 | static const char *whitelist_ro[] = { | |
368 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
369 | }; |
370 | const char **p; | |
371 | ||
b64ec4e4 | 372 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 373 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 374 | } |
eb852011 | 375 | |
b64ec4e4 | 376 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
377 | if (!strcmp(drv->format_name, *p)) { |
378 | return 1; | |
379 | } | |
380 | } | |
b64ec4e4 FZ |
381 | if (read_only) { |
382 | for (p = whitelist_ro; *p; p++) { | |
383 | if (!strcmp(drv->format_name, *p)) { | |
384 | return 1; | |
385 | } | |
386 | } | |
387 | } | |
eb852011 MA |
388 | return 0; |
389 | } | |
390 | ||
b64ec4e4 FZ |
391 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
392 | bool read_only) | |
eb852011 MA |
393 | { |
394 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 395 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
396 | } |
397 | ||
5b7e1542 ZYW |
398 | typedef struct CreateCo { |
399 | BlockDriver *drv; | |
400 | char *filename; | |
401 | QEMUOptionParameter *options; | |
402 | int ret; | |
cc84d90f | 403 | Error *err; |
5b7e1542 ZYW |
404 | } CreateCo; |
405 | ||
406 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
407 | { | |
cc84d90f HR |
408 | Error *local_err = NULL; |
409 | int ret; | |
410 | ||
5b7e1542 ZYW |
411 | CreateCo *cco = opaque; |
412 | assert(cco->drv); | |
413 | ||
cc84d90f HR |
414 | ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err); |
415 | if (error_is_set(&local_err)) { | |
416 | error_propagate(&cco->err, local_err); | |
417 | } | |
418 | cco->ret = ret; | |
5b7e1542 ZYW |
419 | } |
420 | ||
0e7e1989 | 421 | int bdrv_create(BlockDriver *drv, const char* filename, |
cc84d90f | 422 | QEMUOptionParameter *options, Error **errp) |
ea2384d3 | 423 | { |
5b7e1542 ZYW |
424 | int ret; |
425 | ||
426 | Coroutine *co; | |
427 | CreateCo cco = { | |
428 | .drv = drv, | |
429 | .filename = g_strdup(filename), | |
430 | .options = options, | |
431 | .ret = NOT_DONE, | |
cc84d90f | 432 | .err = NULL, |
5b7e1542 ZYW |
433 | }; |
434 | ||
435 | if (!drv->bdrv_create) { | |
cc84d90f | 436 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
437 | ret = -ENOTSUP; |
438 | goto out; | |
5b7e1542 ZYW |
439 | } |
440 | ||
441 | if (qemu_in_coroutine()) { | |
442 | /* Fast-path if already in coroutine context */ | |
443 | bdrv_create_co_entry(&cco); | |
444 | } else { | |
445 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
446 | qemu_coroutine_enter(co, &cco); | |
447 | while (cco.ret == NOT_DONE) { | |
448 | qemu_aio_wait(); | |
449 | } | |
450 | } | |
451 | ||
452 | ret = cco.ret; | |
cc84d90f HR |
453 | if (ret < 0) { |
454 | if (error_is_set(&cco.err)) { | |
455 | error_propagate(errp, cco.err); | |
456 | } else { | |
457 | error_setg_errno(errp, -ret, "Could not create image"); | |
458 | } | |
459 | } | |
0e7e1989 | 460 | |
80168bff LC |
461 | out: |
462 | g_free(cco.filename); | |
5b7e1542 | 463 | return ret; |
ea2384d3 FB |
464 | } |
465 | ||
cc84d90f HR |
466 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options, |
467 | Error **errp) | |
84a12e66 CH |
468 | { |
469 | BlockDriver *drv; | |
cc84d90f HR |
470 | Error *local_err = NULL; |
471 | int ret; | |
84a12e66 | 472 | |
98289620 | 473 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 474 | if (drv == NULL) { |
cc84d90f | 475 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 476 | return -ENOENT; |
84a12e66 CH |
477 | } |
478 | ||
cc84d90f HR |
479 | ret = bdrv_create(drv, filename, options, &local_err); |
480 | if (error_is_set(&local_err)) { | |
481 | error_propagate(errp, local_err); | |
482 | } | |
483 | return ret; | |
84a12e66 CH |
484 | } |
485 | ||
d34682cd KW |
486 | static int bdrv_refresh_limits(BlockDriverState *bs) |
487 | { | |
488 | BlockDriver *drv = bs->drv; | |
489 | ||
490 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
491 | ||
492 | if (drv && drv->bdrv_refresh_limits) { | |
493 | return drv->bdrv_refresh_limits(bs); | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
eba25057 JM |
499 | /* |
500 | * Create a uniquely-named empty temporary file. | |
501 | * Return 0 upon success, otherwise a negative errno value. | |
502 | */ | |
503 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 504 | { |
eba25057 | 505 | #ifdef _WIN32 |
3b9f94e1 | 506 | char temp_dir[MAX_PATH]; |
eba25057 JM |
507 | /* GetTempFileName requires that its output buffer (4th param) |
508 | have length MAX_PATH or greater. */ | |
509 | assert(size >= MAX_PATH); | |
510 | return (GetTempPath(MAX_PATH, temp_dir) | |
511 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
512 | ? 0 : -GetLastError()); | |
d5249393 | 513 | #else |
67b915a5 | 514 | int fd; |
7ccfb2eb | 515 | const char *tmpdir; |
0badc1ee AJ |
516 | tmpdir = getenv("TMPDIR"); |
517 | if (!tmpdir) | |
518 | tmpdir = "/tmp"; | |
eba25057 JM |
519 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
520 | return -EOVERFLOW; | |
521 | } | |
ea2384d3 | 522 | fd = mkstemp(filename); |
fe235a06 DH |
523 | if (fd < 0) { |
524 | return -errno; | |
525 | } | |
526 | if (close(fd) != 0) { | |
527 | unlink(filename); | |
eba25057 JM |
528 | return -errno; |
529 | } | |
530 | return 0; | |
d5249393 | 531 | #endif |
eba25057 | 532 | } |
fc01f7e7 | 533 | |
84a12e66 CH |
534 | /* |
535 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
536 | * recognized as a host CDROM. | |
537 | */ | |
538 | static BlockDriver *find_hdev_driver(const char *filename) | |
539 | { | |
540 | int score_max = 0, score; | |
541 | BlockDriver *drv = NULL, *d; | |
542 | ||
543 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
544 | if (d->bdrv_probe_device) { | |
545 | score = d->bdrv_probe_device(filename); | |
546 | if (score > score_max) { | |
547 | score_max = score; | |
548 | drv = d; | |
549 | } | |
550 | } | |
551 | } | |
552 | ||
553 | return drv; | |
554 | } | |
555 | ||
98289620 KW |
556 | BlockDriver *bdrv_find_protocol(const char *filename, |
557 | bool allow_protocol_prefix) | |
83f64091 FB |
558 | { |
559 | BlockDriver *drv1; | |
560 | char protocol[128]; | |
1cec71e3 | 561 | int len; |
83f64091 | 562 | const char *p; |
19cb3738 | 563 | |
66f82cee KW |
564 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
565 | ||
39508e7a CH |
566 | /* |
567 | * XXX(hch): we really should not let host device detection | |
568 | * override an explicit protocol specification, but moving this | |
569 | * later breaks access to device names with colons in them. | |
570 | * Thanks to the brain-dead persistent naming schemes on udev- | |
571 | * based Linux systems those actually are quite common. | |
572 | */ | |
573 | drv1 = find_hdev_driver(filename); | |
574 | if (drv1) { | |
575 | return drv1; | |
576 | } | |
577 | ||
98289620 | 578 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 579 | return bdrv_find_format("file"); |
84a12e66 | 580 | } |
98289620 | 581 | |
9e0b22f4 SH |
582 | p = strchr(filename, ':'); |
583 | assert(p != NULL); | |
1cec71e3 AL |
584 | len = p - filename; |
585 | if (len > sizeof(protocol) - 1) | |
586 | len = sizeof(protocol) - 1; | |
587 | memcpy(protocol, filename, len); | |
588 | protocol[len] = '\0'; | |
8a22f02a | 589 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 590 | if (drv1->protocol_name && |
8a22f02a | 591 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 592 | return drv1; |
8a22f02a | 593 | } |
83f64091 FB |
594 | } |
595 | return NULL; | |
596 | } | |
597 | ||
f500a6d3 | 598 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 599 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 600 | { |
f500a6d3 | 601 | int score, score_max; |
f3a5d3f8 CH |
602 | BlockDriver *drv1, *drv; |
603 | uint8_t buf[2048]; | |
f500a6d3 | 604 | int ret = 0; |
f8ea0b00 | 605 | |
08a00559 | 606 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 607 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
608 | drv = bdrv_find_format("raw"); |
609 | if (!drv) { | |
34b5d2c6 | 610 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
611 | ret = -ENOENT; |
612 | } | |
613 | *pdrv = drv; | |
614 | return ret; | |
1a396859 | 615 | } |
f8ea0b00 | 616 | |
83f64091 | 617 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 618 | if (ret < 0) { |
34b5d2c6 HR |
619 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
620 | "format"); | |
c98ac35d SW |
621 | *pdrv = NULL; |
622 | return ret; | |
83f64091 FB |
623 | } |
624 | ||
ea2384d3 | 625 | score_max = 0; |
84a12e66 | 626 | drv = NULL; |
8a22f02a | 627 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
628 | if (drv1->bdrv_probe) { |
629 | score = drv1->bdrv_probe(buf, ret, filename); | |
630 | if (score > score_max) { | |
631 | score_max = score; | |
632 | drv = drv1; | |
633 | } | |
0849bf08 | 634 | } |
fc01f7e7 | 635 | } |
c98ac35d | 636 | if (!drv) { |
34b5d2c6 HR |
637 | error_setg(errp, "Could not determine image format: No compatible " |
638 | "driver found"); | |
c98ac35d SW |
639 | ret = -ENOENT; |
640 | } | |
641 | *pdrv = drv; | |
642 | return ret; | |
ea2384d3 FB |
643 | } |
644 | ||
51762288 SH |
645 | /** |
646 | * Set the current 'total_sectors' value | |
647 | */ | |
648 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
649 | { | |
650 | BlockDriver *drv = bs->drv; | |
651 | ||
396759ad NB |
652 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
653 | if (bs->sg) | |
654 | return 0; | |
655 | ||
51762288 SH |
656 | /* query actual device if possible, otherwise just trust the hint */ |
657 | if (drv->bdrv_getlength) { | |
658 | int64_t length = drv->bdrv_getlength(bs); | |
659 | if (length < 0) { | |
660 | return length; | |
661 | } | |
7e382003 | 662 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
663 | } |
664 | ||
665 | bs->total_sectors = hint; | |
666 | return 0; | |
667 | } | |
668 | ||
9e8f1835 PB |
669 | /** |
670 | * Set open flags for a given discard mode | |
671 | * | |
672 | * Return 0 on success, -1 if the discard mode was invalid. | |
673 | */ | |
674 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
675 | { | |
676 | *flags &= ~BDRV_O_UNMAP; | |
677 | ||
678 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
679 | /* do nothing */ | |
680 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
681 | *flags |= BDRV_O_UNMAP; | |
682 | } else { | |
683 | return -1; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
c3993cdc SH |
689 | /** |
690 | * Set open flags for a given cache mode | |
691 | * | |
692 | * Return 0 on success, -1 if the cache mode was invalid. | |
693 | */ | |
694 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
695 | { | |
696 | *flags &= ~BDRV_O_CACHE_MASK; | |
697 | ||
698 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
699 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
700 | } else if (!strcmp(mode, "directsync")) { |
701 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
702 | } else if (!strcmp(mode, "writeback")) { |
703 | *flags |= BDRV_O_CACHE_WB; | |
704 | } else if (!strcmp(mode, "unsafe")) { | |
705 | *flags |= BDRV_O_CACHE_WB; | |
706 | *flags |= BDRV_O_NO_FLUSH; | |
707 | } else if (!strcmp(mode, "writethrough")) { | |
708 | /* this is the default */ | |
709 | } else { | |
710 | return -1; | |
711 | } | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
53fec9d3 SH |
716 | /** |
717 | * The copy-on-read flag is actually a reference count so multiple users may | |
718 | * use the feature without worrying about clobbering its previous state. | |
719 | * Copy-on-read stays enabled until all users have called to disable it. | |
720 | */ | |
721 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
722 | { | |
723 | bs->copy_on_read++; | |
724 | } | |
725 | ||
726 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
727 | { | |
728 | assert(bs->copy_on_read > 0); | |
729 | bs->copy_on_read--; | |
730 | } | |
731 | ||
7b272452 KW |
732 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
733 | { | |
734 | int open_flags = flags | BDRV_O_CACHE_WB; | |
735 | ||
736 | /* | |
737 | * Clear flags that are internal to the block layer before opening the | |
738 | * image. | |
739 | */ | |
740 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
741 | ||
742 | /* | |
743 | * Snapshots should be writable. | |
744 | */ | |
745 | if (bs->is_temporary) { | |
746 | open_flags |= BDRV_O_RDWR; | |
747 | } | |
748 | ||
749 | return open_flags; | |
750 | } | |
751 | ||
6913c0c2 BC |
752 | static int bdrv_assign_node_name(BlockDriverState *bs, |
753 | const char *node_name, | |
754 | Error **errp) | |
755 | { | |
756 | if (!node_name) { | |
757 | return 0; | |
758 | } | |
759 | ||
760 | /* empty string node name is invalid */ | |
761 | if (node_name[0] == '\0') { | |
762 | error_setg(errp, "Empty node name"); | |
763 | return -EINVAL; | |
764 | } | |
765 | ||
766 | /* takes care of avoiding duplicates node names */ | |
767 | if (bdrv_find_node(node_name)) { | |
768 | error_setg(errp, "Duplicate node name"); | |
769 | return -EINVAL; | |
770 | } | |
771 | ||
772 | /* copy node name into the bs and insert it into the graph list */ | |
773 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
774 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
57915332 KW |
779 | /* |
780 | * Common part for opening disk images and files | |
b6ad491a KW |
781 | * |
782 | * Removes all processed options from *options. | |
57915332 | 783 | */ |
f500a6d3 | 784 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 785 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
786 | { |
787 | int ret, open_flags; | |
035fccdf | 788 | const char *filename; |
6913c0c2 | 789 | const char *node_name = NULL; |
34b5d2c6 | 790 | Error *local_err = NULL; |
57915332 KW |
791 | |
792 | assert(drv != NULL); | |
6405875c | 793 | assert(bs->file == NULL); |
707ff828 | 794 | assert(options != NULL && bs->options != options); |
57915332 | 795 | |
45673671 KW |
796 | if (file != NULL) { |
797 | filename = file->filename; | |
798 | } else { | |
799 | filename = qdict_get_try_str(options, "filename"); | |
800 | } | |
801 | ||
802 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); | |
28dcee10 | 803 | |
6913c0c2 BC |
804 | node_name = qdict_get_try_str(options, "node-name"); |
805 | ret = bdrv_assign_node_name(bs, node_name, errp); | |
806 | if (ret < 0) { | |
807 | return ret; | |
808 | } | |
809 | qdict_del(options, "node-name"); | |
810 | ||
5d186eb0 KW |
811 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
812 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
813 | * and return immediately. */ | |
814 | if (file != NULL && drv->bdrv_file_open) { | |
815 | bdrv_swap(file, bs); | |
816 | return 0; | |
817 | } | |
818 | ||
57915332 | 819 | bs->open_flags = flags; |
57915332 | 820 | bs->buffer_alignment = 512; |
0d51b4de | 821 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
822 | open_flags = bdrv_open_flags(bs, flags); |
823 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
824 | ||
825 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
826 | error_setg(errp, |
827 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
828 | ? "Driver '%s' can only be used for read-only devices" | |
829 | : "Driver '%s' is not whitelisted", | |
830 | drv->format_name); | |
b64ec4e4 FZ |
831 | return -ENOTSUP; |
832 | } | |
57915332 | 833 | |
53fec9d3 | 834 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
835 | if (flags & BDRV_O_COPY_ON_READ) { |
836 | if (!bs->read_only) { | |
837 | bdrv_enable_copy_on_read(bs); | |
838 | } else { | |
839 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
840 | return -EINVAL; | |
841 | } | |
53fec9d3 SH |
842 | } |
843 | ||
c2ad1b0c KW |
844 | if (filename != NULL) { |
845 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
846 | } else { | |
847 | bs->filename[0] = '\0'; | |
848 | } | |
57915332 | 849 | |
57915332 | 850 | bs->drv = drv; |
7267c094 | 851 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 852 | |
03f541bd | 853 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 854 | |
66f82cee KW |
855 | /* Open the image, either directly or using a protocol */ |
856 | if (drv->bdrv_file_open) { | |
5d186eb0 | 857 | assert(file == NULL); |
030be321 | 858 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 859 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 860 | } else { |
2af5ef70 | 861 | if (file == NULL) { |
34b5d2c6 HR |
862 | error_setg(errp, "Can't use '%s' as a block driver for the " |
863 | "protocol level", drv->format_name); | |
2af5ef70 KW |
864 | ret = -EINVAL; |
865 | goto free_and_fail; | |
866 | } | |
f500a6d3 | 867 | bs->file = file; |
34b5d2c6 | 868 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
869 | } |
870 | ||
57915332 | 871 | if (ret < 0) { |
34b5d2c6 HR |
872 | if (error_is_set(&local_err)) { |
873 | error_propagate(errp, local_err); | |
2fa9aa59 DH |
874 | } else if (bs->filename[0]) { |
875 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
876 | } else { |
877 | error_setg_errno(errp, -ret, "Could not open image"); | |
878 | } | |
57915332 KW |
879 | goto free_and_fail; |
880 | } | |
881 | ||
51762288 SH |
882 | ret = refresh_total_sectors(bs, bs->total_sectors); |
883 | if (ret < 0) { | |
34b5d2c6 | 884 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 885 | goto free_and_fail; |
57915332 | 886 | } |
51762288 | 887 | |
d34682cd KW |
888 | bdrv_refresh_limits(bs); |
889 | ||
57915332 KW |
890 | #ifndef _WIN32 |
891 | if (bs->is_temporary) { | |
d4cea8df DH |
892 | assert(bs->filename[0] != '\0'); |
893 | unlink(bs->filename); | |
57915332 KW |
894 | } |
895 | #endif | |
896 | return 0; | |
897 | ||
898 | free_and_fail: | |
f500a6d3 | 899 | bs->file = NULL; |
7267c094 | 900 | g_free(bs->opaque); |
57915332 KW |
901 | bs->opaque = NULL; |
902 | bs->drv = NULL; | |
903 | return ret; | |
904 | } | |
905 | ||
b6ce07aa KW |
906 | /* |
907 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
908 | * |
909 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
910 | * empty set of options. The reference to the QDict belongs to the block layer | |
911 | * after the call (even on failure), so if the caller intends to reuse the | |
912 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 913 | */ |
787e4a85 | 914 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
72daa72e HR |
915 | const char *reference, QDict *options, int flags, |
916 | Error **errp) | |
ea2384d3 | 917 | { |
72daa72e | 918 | BlockDriverState *bs = NULL; |
6db95603 | 919 | BlockDriver *drv; |
c2ad1b0c | 920 | const char *drvname; |
98289620 | 921 | bool allow_protocol_prefix = false; |
34b5d2c6 | 922 | Error *local_err = NULL; |
83f64091 FB |
923 | int ret; |
924 | ||
707ff828 KW |
925 | /* NULL means an empty set of options */ |
926 | if (options == NULL) { | |
927 | options = qdict_new(); | |
928 | } | |
929 | ||
72daa72e HR |
930 | if (reference) { |
931 | if (filename || qdict_size(options)) { | |
932 | error_setg(errp, "Cannot reference an existing block device with " | |
933 | "additional options or a new filename"); | |
934 | return -EINVAL; | |
935 | } | |
936 | QDECREF(options); | |
937 | ||
938 | bs = bdrv_find(reference); | |
939 | if (!bs) { | |
940 | error_setg(errp, "Cannot find block device '%s'", reference); | |
941 | return -ENODEV; | |
942 | } | |
943 | bdrv_ref(bs); | |
944 | *pbs = bs; | |
945 | return 0; | |
946 | } | |
947 | ||
83f64091 | 948 | bs = bdrv_new(""); |
707ff828 KW |
949 | bs->options = options; |
950 | options = qdict_clone_shallow(options); | |
951 | ||
035fccdf KW |
952 | /* Fetch the file name from the options QDict if necessary */ |
953 | if (!filename) { | |
954 | filename = qdict_get_try_str(options, "filename"); | |
955 | } else if (filename && !qdict_haskey(options, "filename")) { | |
956 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 957 | allow_protocol_prefix = true; |
035fccdf | 958 | } else { |
34b5d2c6 HR |
959 | error_setg(errp, "Can't specify 'file' and 'filename' options at the " |
960 | "same time"); | |
035fccdf KW |
961 | ret = -EINVAL; |
962 | goto fail; | |
963 | } | |
964 | ||
c2ad1b0c KW |
965 | /* Find the right block driver */ |
966 | drvname = qdict_get_try_str(options, "driver"); | |
967 | if (drvname) { | |
8f94a6e4 | 968 | drv = bdrv_find_format(drvname); |
34b5d2c6 HR |
969 | if (!drv) { |
970 | error_setg(errp, "Unknown driver '%s'", drvname); | |
971 | } | |
c2ad1b0c KW |
972 | qdict_del(options, "driver"); |
973 | } else if (filename) { | |
98289620 KW |
974 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
975 | if (!drv) { | |
34b5d2c6 | 976 | error_setg(errp, "Unknown protocol"); |
98289620 | 977 | } |
c2ad1b0c | 978 | } else { |
34b5d2c6 | 979 | error_setg(errp, "Must specify either driver or file"); |
c2ad1b0c KW |
980 | drv = NULL; |
981 | } | |
982 | ||
983 | if (!drv) { | |
34b5d2c6 | 984 | /* errp has been set already */ |
c2ad1b0c KW |
985 | ret = -ENOENT; |
986 | goto fail; | |
987 | } | |
988 | ||
989 | /* Parse the filename and open it */ | |
990 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d KW |
991 | drv->bdrv_parse_filename(filename, options, &local_err); |
992 | if (error_is_set(&local_err)) { | |
34b5d2c6 | 993 | error_propagate(errp, local_err); |
6963a30d KW |
994 | ret = -EINVAL; |
995 | goto fail; | |
996 | } | |
56d1b4d2 | 997 | qdict_del(options, "filename"); |
030be321 | 998 | } else if (drv->bdrv_needs_filename && !filename) { |
34b5d2c6 HR |
999 | error_setg(errp, "The '%s' block driver requires a file name", |
1000 | drv->format_name); | |
c2ad1b0c KW |
1001 | ret = -EINVAL; |
1002 | goto fail; | |
6963a30d KW |
1003 | } |
1004 | ||
505d7583 HR |
1005 | if (!drv->bdrv_file_open) { |
1006 | ret = bdrv_open(bs, filename, options, flags, drv, &local_err); | |
1007 | options = NULL; | |
1008 | } else { | |
1009 | ret = bdrv_open_common(bs, NULL, options, flags, drv, &local_err); | |
1010 | } | |
83f64091 | 1011 | if (ret < 0) { |
34b5d2c6 | 1012 | error_propagate(errp, local_err); |
707ff828 KW |
1013 | goto fail; |
1014 | } | |
1015 | ||
1016 | /* Check if any unknown options were used */ | |
505d7583 | 1017 | if (options && (qdict_size(options) != 0)) { |
707ff828 | 1018 | const QDictEntry *entry = qdict_first(options); |
34b5d2c6 HR |
1019 | error_setg(errp, "Block protocol '%s' doesn't support the option '%s'", |
1020 | drv->format_name, entry->key); | |
707ff828 KW |
1021 | ret = -EINVAL; |
1022 | goto fail; | |
3b0d4f61 | 1023 | } |
707ff828 KW |
1024 | QDECREF(options); |
1025 | ||
71d0770c | 1026 | bs->growable = 1; |
83f64091 FB |
1027 | *pbs = bs; |
1028 | return 0; | |
707ff828 KW |
1029 | |
1030 | fail: | |
1031 | QDECREF(options); | |
1032 | if (!bs->drv) { | |
1033 | QDECREF(bs->options); | |
1034 | } | |
4f6fd349 | 1035 | bdrv_unref(bs); |
707ff828 | 1036 | return ret; |
83f64091 FB |
1037 | } |
1038 | ||
31ca6d07 KW |
1039 | /* |
1040 | * Opens the backing file for a BlockDriverState if not yet open | |
1041 | * | |
1042 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1043 | * empty set of options. The reference to the QDict is transferred to this | |
1044 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1045 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1046 | */ | |
34b5d2c6 | 1047 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 PB |
1048 | { |
1049 | char backing_filename[PATH_MAX]; | |
1050 | int back_flags, ret; | |
1051 | BlockDriver *back_drv = NULL; | |
34b5d2c6 | 1052 | Error *local_err = NULL; |
9156df12 PB |
1053 | |
1054 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1055 | QDECREF(options); |
9156df12 PB |
1056 | return 0; |
1057 | } | |
1058 | ||
31ca6d07 KW |
1059 | /* NULL means an empty set of options */ |
1060 | if (options == NULL) { | |
1061 | options = qdict_new(); | |
1062 | } | |
1063 | ||
9156df12 | 1064 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1065 | if (qdict_haskey(options, "file.filename")) { |
1066 | backing_filename[0] = '\0'; | |
1067 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1068 | QDECREF(options); |
9156df12 | 1069 | return 0; |
dbecebdd FZ |
1070 | } else { |
1071 | bdrv_get_full_backing_filename(bs, backing_filename, | |
1072 | sizeof(backing_filename)); | |
9156df12 PB |
1073 | } |
1074 | ||
1075 | bs->backing_hd = bdrv_new(""); | |
9156df12 PB |
1076 | |
1077 | if (bs->backing_format[0] != '\0') { | |
1078 | back_drv = bdrv_find_format(bs->backing_format); | |
1079 | } | |
1080 | ||
1081 | /* backing files always opened read-only */ | |
87a5debd TL |
1082 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | |
1083 | BDRV_O_COPY_ON_READ); | |
9156df12 | 1084 | |
31ca6d07 KW |
1085 | ret = bdrv_open(bs->backing_hd, |
1086 | *backing_filename ? backing_filename : NULL, options, | |
34b5d2c6 | 1087 | back_flags, back_drv, &local_err); |
9156df12 | 1088 | if (ret < 0) { |
4f6fd349 | 1089 | bdrv_unref(bs->backing_hd); |
9156df12 PB |
1090 | bs->backing_hd = NULL; |
1091 | bs->open_flags |= BDRV_O_NO_BACKING; | |
b04b6b6e FZ |
1092 | error_setg(errp, "Could not open backing file: %s", |
1093 | error_get_pretty(local_err)); | |
1094 | error_free(local_err); | |
9156df12 PB |
1095 | return ret; |
1096 | } | |
d80ac658 PF |
1097 | |
1098 | if (bs->backing_hd->file) { | |
1099 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), | |
1100 | bs->backing_hd->file->filename); | |
1101 | } | |
1102 | ||
d34682cd KW |
1103 | /* Recalculate the BlockLimits with the backing file */ |
1104 | bdrv_refresh_limits(bs); | |
1105 | ||
9156df12 PB |
1106 | return 0; |
1107 | } | |
1108 | ||
da557aac HR |
1109 | /* |
1110 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1111 | * device's options. | |
1112 | * | |
1113 | * If force_raw is true, bdrv_file_open() will be used, thereby preventing any | |
1114 | * image format auto-detection. If it is false and a filename is given, | |
1115 | * bdrv_open() will be used for auto-detection. | |
1116 | * | |
1117 | * If allow_none is true, no image will be opened if filename is false and no | |
1118 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1119 | * | |
1120 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1121 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1122 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1123 | * BlockdevRef. | |
1124 | * | |
1125 | * The BlockdevRef will be removed from the options QDict. | |
1126 | */ | |
1127 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1128 | QDict *options, const char *bdref_key, int flags, | |
1129 | bool force_raw, bool allow_none, Error **errp) | |
1130 | { | |
1131 | QDict *image_options; | |
1132 | int ret; | |
1133 | char *bdref_key_dot; | |
1134 | const char *reference; | |
1135 | ||
1136 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); | |
1137 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1138 | g_free(bdref_key_dot); | |
1139 | ||
1140 | reference = qdict_get_try_str(options, bdref_key); | |
1141 | if (!filename && !reference && !qdict_size(image_options)) { | |
1142 | if (allow_none) { | |
1143 | ret = 0; | |
1144 | } else { | |
1145 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1146 | bdref_key); | |
1147 | ret = -EINVAL; | |
1148 | } | |
1149 | goto done; | |
1150 | } | |
1151 | ||
1152 | if (filename && !force_raw) { | |
1153 | /* If a filename is given and the block driver should be detected | |
1154 | automatically (instead of using none), use bdrv_open() in order to do | |
1155 | that auto-detection. */ | |
1156 | BlockDriverState *bs; | |
1157 | ||
1158 | if (reference) { | |
1159 | error_setg(errp, "Cannot reference an existing block device while " | |
1160 | "giving a filename"); | |
1161 | ret = -EINVAL; | |
1162 | goto done; | |
1163 | } | |
1164 | ||
1165 | bs = bdrv_new(""); | |
1166 | ret = bdrv_open(bs, filename, image_options, flags, NULL, errp); | |
1167 | if (ret < 0) { | |
1168 | bdrv_unref(bs); | |
1169 | } else { | |
1170 | *pbs = bs; | |
1171 | } | |
1172 | } else { | |
1173 | ret = bdrv_file_open(pbs, filename, reference, image_options, flags, | |
1174 | errp); | |
1175 | } | |
1176 | ||
1177 | done: | |
1178 | qdict_del(options, bdref_key); | |
1179 | return ret; | |
1180 | } | |
1181 | ||
b6ce07aa KW |
1182 | /* |
1183 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1184 | * |
1185 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1186 | * empty set of options. The reference to the QDict belongs to the block layer | |
1187 | * after the call (even on failure), so if the caller intends to reuse the | |
1188 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 1189 | */ |
de9c0cec | 1190 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
34b5d2c6 | 1191 | int flags, BlockDriver *drv, Error **errp) |
ea2384d3 | 1192 | { |
b6ce07aa | 1193 | int ret; |
89c9bc3d SW |
1194 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
1195 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 1196 | BlockDriverState *file = NULL; |
74fe54f2 | 1197 | const char *drvname; |
34b5d2c6 | 1198 | Error *local_err = NULL; |
712e7874 | 1199 | |
de9c0cec KW |
1200 | /* NULL means an empty set of options */ |
1201 | if (options == NULL) { | |
1202 | options = qdict_new(); | |
1203 | } | |
1204 | ||
1205 | bs->options = options; | |
b6ad491a | 1206 | options = qdict_clone_shallow(options); |
de9c0cec KW |
1207 | |
1208 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 1209 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
1210 | BlockDriverState *bs1; |
1211 | int64_t total_size; | |
91a073a9 | 1212 | BlockDriver *bdrv_qcow2; |
08b392e1 | 1213 | QEMUOptionParameter *create_options; |
9fd3171a | 1214 | QDict *snapshot_options; |
c2ad1b0c | 1215 | |
ea2384d3 FB |
1216 | /* if snapshot, we create a temporary backing file and open it |
1217 | instead of opening 'filename' directly */ | |
33e3963e | 1218 | |
9fd3171a | 1219 | /* Get the required size from the image */ |
ea2384d3 | 1220 | bs1 = bdrv_new(""); |
9fd3171a | 1221 | QINCREF(options); |
c9fbb99d KW |
1222 | ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING, |
1223 | drv, &local_err); | |
51d7c00c | 1224 | if (ret < 0) { |
4f6fd349 | 1225 | bdrv_unref(bs1); |
de9c0cec | 1226 | goto fail; |
ea2384d3 | 1227 | } |
3e82990b | 1228 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1229 | |
4f6fd349 | 1230 | bdrv_unref(bs1); |
3b46e624 | 1231 | |
9fd3171a | 1232 | /* Create the temporary image */ |
eba25057 JM |
1233 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1234 | if (ret < 0) { | |
34b5d2c6 | 1235 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
de9c0cec | 1236 | goto fail; |
eba25057 | 1237 | } |
7c96d46e | 1238 | |
91a073a9 | 1239 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1240 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1241 | NULL); | |
91a073a9 | 1242 | |
08b392e1 | 1243 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
91a073a9 | 1244 | |
cc84d90f | 1245 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err); |
08b392e1 | 1246 | free_option_parameters(create_options); |
51d7c00c | 1247 | if (ret < 0) { |
34b5d2c6 | 1248 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
cc84d90f HR |
1249 | "'%s': %s", tmp_filename, |
1250 | error_get_pretty(local_err)); | |
1251 | error_free(local_err); | |
1252 | local_err = NULL; | |
de9c0cec | 1253 | goto fail; |
ea2384d3 | 1254 | } |
91a073a9 | 1255 | |
9fd3171a KW |
1256 | /* Prepare a new options QDict for the temporary file, where user |
1257 | * options refer to the backing file */ | |
1258 | if (filename) { | |
1259 | qdict_put(options, "file.filename", qstring_from_str(filename)); | |
1260 | } | |
1261 | if (drv) { | |
1262 | qdict_put(options, "driver", qstring_from_str(drv->format_name)); | |
1263 | } | |
1264 | ||
1265 | snapshot_options = qdict_new(); | |
1266 | qdict_put(snapshot_options, "backing", options); | |
1267 | qdict_flatten(snapshot_options); | |
1268 | ||
1269 | bs->options = snapshot_options; | |
1270 | options = qdict_clone_shallow(bs->options); | |
1271 | ||
ea2384d3 | 1272 | filename = tmp_filename; |
91a073a9 | 1273 | drv = bdrv_qcow2; |
ea2384d3 FB |
1274 | bs->is_temporary = 1; |
1275 | } | |
712e7874 | 1276 | |
f500a6d3 KW |
1277 | /* Open image file without format layer */ |
1278 | if (flags & BDRV_O_RDWR) { | |
1279 | flags |= BDRV_O_ALLOW_RDWR; | |
1280 | } | |
1281 | ||
054963f8 HR |
1282 | ret = bdrv_open_image(&file, filename, options, "file", |
1283 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP), true, true, | |
1284 | &local_err); | |
1285 | if (ret < 0) { | |
1286 | goto fail; | |
f500a6d3 KW |
1287 | } |
1288 | ||
b6ce07aa | 1289 | /* Find the right image format driver */ |
74fe54f2 KW |
1290 | drvname = qdict_get_try_str(options, "driver"); |
1291 | if (drvname) { | |
8f94a6e4 | 1292 | drv = bdrv_find_format(drvname); |
74fe54f2 | 1293 | qdict_del(options, "driver"); |
06d22aa3 KW |
1294 | if (!drv) { |
1295 | error_setg(errp, "Invalid driver: '%s'", drvname); | |
1296 | ret = -EINVAL; | |
1297 | goto unlink_and_fail; | |
1298 | } | |
74fe54f2 KW |
1299 | } |
1300 | ||
6db95603 | 1301 | if (!drv) { |
2a05cbe4 HR |
1302 | if (file) { |
1303 | ret = find_image_format(file, filename, &drv, &local_err); | |
1304 | } else { | |
1305 | error_setg(errp, "Must specify either driver or file"); | |
1306 | ret = -EINVAL; | |
1307 | goto unlink_and_fail; | |
1308 | } | |
51d7c00c | 1309 | } |
6987307c | 1310 | |
51d7c00c | 1311 | if (!drv) { |
51d7c00c | 1312 | goto unlink_and_fail; |
ea2384d3 | 1313 | } |
b6ce07aa KW |
1314 | |
1315 | /* Open the image */ | |
34b5d2c6 | 1316 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1317 | if (ret < 0) { |
6987307c CH |
1318 | goto unlink_and_fail; |
1319 | } | |
1320 | ||
2a05cbe4 | 1321 | if (file && (bs->file != file)) { |
4f6fd349 | 1322 | bdrv_unref(file); |
f500a6d3 KW |
1323 | file = NULL; |
1324 | } | |
1325 | ||
b6ce07aa | 1326 | /* If there is a backing file, use it */ |
9156df12 | 1327 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1328 | QDict *backing_options; |
1329 | ||
5726d872 | 1330 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1331 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1332 | if (ret < 0) { |
b6ad491a | 1333 | goto close_and_fail; |
b6ce07aa | 1334 | } |
b6ce07aa KW |
1335 | } |
1336 | ||
b6ad491a KW |
1337 | /* Check if any unknown options were used */ |
1338 | if (qdict_size(options) != 0) { | |
1339 | const QDictEntry *entry = qdict_first(options); | |
34b5d2c6 HR |
1340 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
1341 | "support the option '%s'", drv->format_name, bs->device_name, | |
1342 | entry->key); | |
b6ad491a KW |
1343 | |
1344 | ret = -EINVAL; | |
1345 | goto close_and_fail; | |
1346 | } | |
1347 | QDECREF(options); | |
1348 | ||
b6ce07aa | 1349 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1350 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1351 | } |
1352 | ||
1353 | return 0; | |
1354 | ||
1355 | unlink_and_fail: | |
f500a6d3 | 1356 | if (file != NULL) { |
4f6fd349 | 1357 | bdrv_unref(file); |
f500a6d3 | 1358 | } |
b6ce07aa KW |
1359 | if (bs->is_temporary) { |
1360 | unlink(filename); | |
1361 | } | |
de9c0cec KW |
1362 | fail: |
1363 | QDECREF(bs->options); | |
b6ad491a | 1364 | QDECREF(options); |
de9c0cec | 1365 | bs->options = NULL; |
34b5d2c6 HR |
1366 | if (error_is_set(&local_err)) { |
1367 | error_propagate(errp, local_err); | |
1368 | } | |
b6ad491a | 1369 | return ret; |
de9c0cec | 1370 | |
b6ad491a KW |
1371 | close_and_fail: |
1372 | bdrv_close(bs); | |
1373 | QDECREF(options); | |
34b5d2c6 HR |
1374 | if (error_is_set(&local_err)) { |
1375 | error_propagate(errp, local_err); | |
1376 | } | |
b6ce07aa KW |
1377 | return ret; |
1378 | } | |
1379 | ||
e971aa12 JC |
1380 | typedef struct BlockReopenQueueEntry { |
1381 | bool prepared; | |
1382 | BDRVReopenState state; | |
1383 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1384 | } BlockReopenQueueEntry; | |
1385 | ||
1386 | /* | |
1387 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1388 | * reopen of multiple devices. | |
1389 | * | |
1390 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1391 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1392 | * be created and initialized. This newly created BlockReopenQueue should be | |
1393 | * passed back in for subsequent calls that are intended to be of the same | |
1394 | * atomic 'set'. | |
1395 | * | |
1396 | * bs is the BlockDriverState to add to the reopen queue. | |
1397 | * | |
1398 | * flags contains the open flags for the associated bs | |
1399 | * | |
1400 | * returns a pointer to bs_queue, which is either the newly allocated | |
1401 | * bs_queue, or the existing bs_queue being used. | |
1402 | * | |
1403 | */ | |
1404 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1405 | BlockDriverState *bs, int flags) | |
1406 | { | |
1407 | assert(bs != NULL); | |
1408 | ||
1409 | BlockReopenQueueEntry *bs_entry; | |
1410 | if (bs_queue == NULL) { | |
1411 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1412 | QSIMPLEQ_INIT(bs_queue); | |
1413 | } | |
1414 | ||
1415 | if (bs->file) { | |
1416 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1417 | } | |
1418 | ||
1419 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1420 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1421 | ||
1422 | bs_entry->state.bs = bs; | |
1423 | bs_entry->state.flags = flags; | |
1424 | ||
1425 | return bs_queue; | |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1430 | * | |
1431 | * The queue passed in (bs_queue) must have been built up previous | |
1432 | * via bdrv_reopen_queue(). | |
1433 | * | |
1434 | * Reopens all BDS specified in the queue, with the appropriate | |
1435 | * flags. All devices are prepared for reopen, and failure of any | |
1436 | * device will cause all device changes to be abandonded, and intermediate | |
1437 | * data cleaned up. | |
1438 | * | |
1439 | * If all devices prepare successfully, then the changes are committed | |
1440 | * to all devices. | |
1441 | * | |
1442 | */ | |
1443 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1444 | { | |
1445 | int ret = -1; | |
1446 | BlockReopenQueueEntry *bs_entry, *next; | |
1447 | Error *local_err = NULL; | |
1448 | ||
1449 | assert(bs_queue != NULL); | |
1450 | ||
1451 | bdrv_drain_all(); | |
1452 | ||
1453 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1454 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1455 | error_propagate(errp, local_err); | |
1456 | goto cleanup; | |
1457 | } | |
1458 | bs_entry->prepared = true; | |
1459 | } | |
1460 | ||
1461 | /* If we reach this point, we have success and just need to apply the | |
1462 | * changes | |
1463 | */ | |
1464 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1465 | bdrv_reopen_commit(&bs_entry->state); | |
1466 | } | |
1467 | ||
1468 | ret = 0; | |
1469 | ||
1470 | cleanup: | |
1471 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1472 | if (ret && bs_entry->prepared) { | |
1473 | bdrv_reopen_abort(&bs_entry->state); | |
1474 | } | |
1475 | g_free(bs_entry); | |
1476 | } | |
1477 | g_free(bs_queue); | |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | ||
1482 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1483 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1484 | { | |
1485 | int ret = -1; | |
1486 | Error *local_err = NULL; | |
1487 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1488 | ||
1489 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1490 | if (local_err != NULL) { | |
1491 | error_propagate(errp, local_err); | |
1492 | } | |
1493 | return ret; | |
1494 | } | |
1495 | ||
1496 | ||
1497 | /* | |
1498 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1499 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1500 | * the block driver layer .bdrv_reopen_prepare() | |
1501 | * | |
1502 | * bs is the BlockDriverState to reopen | |
1503 | * flags are the new open flags | |
1504 | * queue is the reopen queue | |
1505 | * | |
1506 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1507 | * as well. | |
1508 | * | |
1509 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1510 | * It is the responsibility of the caller to then call the abort() or | |
1511 | * commit() for any other BDS that have been left in a prepare() state | |
1512 | * | |
1513 | */ | |
1514 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1515 | Error **errp) | |
1516 | { | |
1517 | int ret = -1; | |
1518 | Error *local_err = NULL; | |
1519 | BlockDriver *drv; | |
1520 | ||
1521 | assert(reopen_state != NULL); | |
1522 | assert(reopen_state->bs->drv != NULL); | |
1523 | drv = reopen_state->bs->drv; | |
1524 | ||
1525 | /* if we are to stay read-only, do not allow permission change | |
1526 | * to r/w */ | |
1527 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1528 | reopen_state->flags & BDRV_O_RDWR) { | |
1529 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1530 | reopen_state->bs->device_name); | |
1531 | goto error; | |
1532 | } | |
1533 | ||
1534 | ||
1535 | ret = bdrv_flush(reopen_state->bs); | |
1536 | if (ret) { | |
1537 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1538 | strerror(-ret)); | |
1539 | goto error; | |
1540 | } | |
1541 | ||
1542 | if (drv->bdrv_reopen_prepare) { | |
1543 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1544 | if (ret) { | |
1545 | if (local_err != NULL) { | |
1546 | error_propagate(errp, local_err); | |
1547 | } else { | |
d8b6895f LC |
1548 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1549 | reopen_state->bs->filename); | |
e971aa12 JC |
1550 | } |
1551 | goto error; | |
1552 | } | |
1553 | } else { | |
1554 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1555 | * handler for each supported drv. */ | |
1556 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1557 | drv->format_name, reopen_state->bs->device_name, | |
1558 | "reopening of file"); | |
1559 | ret = -1; | |
1560 | goto error; | |
1561 | } | |
1562 | ||
1563 | ret = 0; | |
1564 | ||
1565 | error: | |
1566 | return ret; | |
1567 | } | |
1568 | ||
1569 | /* | |
1570 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1571 | * makes them final by swapping the staging BlockDriverState contents into | |
1572 | * the active BlockDriverState contents. | |
1573 | */ | |
1574 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1575 | { | |
1576 | BlockDriver *drv; | |
1577 | ||
1578 | assert(reopen_state != NULL); | |
1579 | drv = reopen_state->bs->drv; | |
1580 | assert(drv != NULL); | |
1581 | ||
1582 | /* If there are any driver level actions to take */ | |
1583 | if (drv->bdrv_reopen_commit) { | |
1584 | drv->bdrv_reopen_commit(reopen_state); | |
1585 | } | |
1586 | ||
1587 | /* set BDS specific flags now */ | |
1588 | reopen_state->bs->open_flags = reopen_state->flags; | |
1589 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1590 | BDRV_O_CACHE_WB); | |
1591 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Abort the reopen, and delete and free the staged changes in | |
1596 | * reopen_state | |
1597 | */ | |
1598 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1599 | { | |
1600 | BlockDriver *drv; | |
1601 | ||
1602 | assert(reopen_state != NULL); | |
1603 | drv = reopen_state->bs->drv; | |
1604 | assert(drv != NULL); | |
1605 | ||
1606 | if (drv->bdrv_reopen_abort) { | |
1607 | drv->bdrv_reopen_abort(reopen_state); | |
1608 | } | |
1609 | } | |
1610 | ||
1611 | ||
fc01f7e7 FB |
1612 | void bdrv_close(BlockDriverState *bs) |
1613 | { | |
3cbc002c PB |
1614 | if (bs->job) { |
1615 | block_job_cancel_sync(bs->job); | |
1616 | } | |
58fda173 SH |
1617 | bdrv_drain_all(); /* complete I/O */ |
1618 | bdrv_flush(bs); | |
1619 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1620 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1621 | |
3cbc002c | 1622 | if (bs->drv) { |
557df6ac | 1623 | if (bs->backing_hd) { |
4f6fd349 | 1624 | bdrv_unref(bs->backing_hd); |
557df6ac SH |
1625 | bs->backing_hd = NULL; |
1626 | } | |
ea2384d3 | 1627 | bs->drv->bdrv_close(bs); |
7267c094 | 1628 | g_free(bs->opaque); |
ea2384d3 FB |
1629 | #ifdef _WIN32 |
1630 | if (bs->is_temporary) { | |
1631 | unlink(bs->filename); | |
1632 | } | |
67b915a5 | 1633 | #endif |
ea2384d3 FB |
1634 | bs->opaque = NULL; |
1635 | bs->drv = NULL; | |
53fec9d3 | 1636 | bs->copy_on_read = 0; |
a275fa42 PB |
1637 | bs->backing_file[0] = '\0'; |
1638 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1639 | bs->total_sectors = 0; |
1640 | bs->encrypted = 0; | |
1641 | bs->valid_key = 0; | |
1642 | bs->sg = 0; | |
1643 | bs->growable = 0; | |
0d51b4de | 1644 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1645 | QDECREF(bs->options); |
1646 | bs->options = NULL; | |
b338082b | 1647 | |
66f82cee | 1648 | if (bs->file != NULL) { |
4f6fd349 | 1649 | bdrv_unref(bs->file); |
0ac9377d | 1650 | bs->file = NULL; |
66f82cee | 1651 | } |
b338082b | 1652 | } |
98f90dba | 1653 | |
9ca11154 PH |
1654 | bdrv_dev_change_media_cb(bs, false); |
1655 | ||
98f90dba ZYW |
1656 | /*throttling disk I/O limits*/ |
1657 | if (bs->io_limits_enabled) { | |
1658 | bdrv_io_limits_disable(bs); | |
1659 | } | |
b338082b FB |
1660 | } |
1661 | ||
2bc93fed MK |
1662 | void bdrv_close_all(void) |
1663 | { | |
1664 | BlockDriverState *bs; | |
1665 | ||
dc364f4c | 1666 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
2bc93fed MK |
1667 | bdrv_close(bs); |
1668 | } | |
1669 | } | |
1670 | ||
88266f5a SH |
1671 | /* Check if any requests are in-flight (including throttled requests) */ |
1672 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1673 | { | |
1674 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1675 | return true; | |
1676 | } | |
cc0681c4 BC |
1677 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1678 | return true; | |
1679 | } | |
1680 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1681 | return true; |
1682 | } | |
1683 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1684 | return true; | |
1685 | } | |
1686 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1687 | return true; | |
1688 | } | |
1689 | return false; | |
1690 | } | |
1691 | ||
1692 | static bool bdrv_requests_pending_all(void) | |
1693 | { | |
1694 | BlockDriverState *bs; | |
dc364f4c | 1695 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
88266f5a SH |
1696 | if (bdrv_requests_pending(bs)) { |
1697 | return true; | |
1698 | } | |
1699 | } | |
1700 | return false; | |
1701 | } | |
1702 | ||
922453bc SH |
1703 | /* |
1704 | * Wait for pending requests to complete across all BlockDriverStates | |
1705 | * | |
1706 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1707 | * after calling this function. | |
4c355d53 ZYW |
1708 | * |
1709 | * Note that completion of an asynchronous I/O operation can trigger any | |
1710 | * number of other I/O operations on other devices---for example a coroutine | |
1711 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1712 | * coroutine is complete. Because of this, it is not possible to have a | |
1713 | * function to drain a single device's I/O queue. | |
922453bc SH |
1714 | */ |
1715 | void bdrv_drain_all(void) | |
1716 | { | |
88266f5a SH |
1717 | /* Always run first iteration so any pending completion BHs run */ |
1718 | bool busy = true; | |
922453bc SH |
1719 | BlockDriverState *bs; |
1720 | ||
88266f5a | 1721 | while (busy) { |
dc364f4c | 1722 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
0b06ef3b | 1723 | bdrv_start_throttled_reqs(bs); |
4c355d53 | 1724 | } |
922453bc | 1725 | |
88266f5a SH |
1726 | busy = bdrv_requests_pending_all(); |
1727 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1728 | } |
1729 | } | |
1730 | ||
dc364f4c BC |
1731 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
1732 | * graph_bdrv_state list. | |
d22b2f41 RH |
1733 | Also, NULL terminate the device_name to prevent double remove */ |
1734 | void bdrv_make_anon(BlockDriverState *bs) | |
1735 | { | |
1736 | if (bs->device_name[0] != '\0') { | |
dc364f4c | 1737 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
d22b2f41 RH |
1738 | } |
1739 | bs->device_name[0] = '\0'; | |
dc364f4c BC |
1740 | if (bs->node_name[0] != '\0') { |
1741 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
1742 | } | |
1743 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
1744 | } |
1745 | ||
e023b2e2 PB |
1746 | static void bdrv_rebind(BlockDriverState *bs) |
1747 | { | |
1748 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1749 | bs->drv->bdrv_rebind(bs); | |
1750 | } | |
1751 | } | |
1752 | ||
4ddc07ca PB |
1753 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1754 | BlockDriverState *bs_src) | |
8802d1fd | 1755 | { |
4ddc07ca PB |
1756 | /* move some fields that need to stay attached to the device */ |
1757 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1758 | |
1759 | /* dev info */ | |
4ddc07ca PB |
1760 | bs_dest->dev_ops = bs_src->dev_ops; |
1761 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1762 | bs_dest->dev = bs_src->dev; | |
1763 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1764 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1765 | |
4ddc07ca | 1766 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1767 | |
cc0681c4 BC |
1768 | /* i/o throttled req */ |
1769 | memcpy(&bs_dest->throttle_state, | |
1770 | &bs_src->throttle_state, | |
1771 | sizeof(ThrottleState)); | |
1772 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1773 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1774 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1775 | |
8802d1fd | 1776 | /* r/w error */ |
4ddc07ca PB |
1777 | bs_dest->on_read_error = bs_src->on_read_error; |
1778 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1779 | |
1780 | /* i/o status */ | |
4ddc07ca PB |
1781 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1782 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1783 | |
a9fc4408 | 1784 | /* dirty bitmap */ |
e4654d2d | 1785 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 1786 | |
9fcb0251 FZ |
1787 | /* reference count */ |
1788 | bs_dest->refcnt = bs_src->refcnt; | |
1789 | ||
a9fc4408 | 1790 | /* job */ |
4ddc07ca PB |
1791 | bs_dest->in_use = bs_src->in_use; |
1792 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1793 | |
8802d1fd | 1794 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1795 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1796 | bs_src->device_name); | |
dc364f4c BC |
1797 | bs_dest->device_list = bs_src->device_list; |
1798 | ||
1799 | /* keep the same entry in graph_bdrv_states | |
1800 | * We do want to swap name but don't want to swap linked list entries | |
1801 | */ | |
1802 | bs_dest->node_list = bs_src->node_list; | |
4ddc07ca | 1803 | } |
8802d1fd | 1804 | |
4ddc07ca PB |
1805 | /* |
1806 | * Swap bs contents for two image chains while they are live, | |
1807 | * while keeping required fields on the BlockDriverState that is | |
1808 | * actually attached to a device. | |
1809 | * | |
1810 | * This will modify the BlockDriverState fields, and swap contents | |
1811 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1812 | * | |
1813 | * bs_new is required to be anonymous. | |
1814 | * | |
1815 | * This function does not create any image files. | |
1816 | */ | |
1817 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1818 | { | |
1819 | BlockDriverState tmp; | |
f6801b83 | 1820 | |
4ddc07ca PB |
1821 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1822 | assert(bs_new->device_name[0] == '\0'); | |
e4654d2d | 1823 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
1824 | assert(bs_new->job == NULL); |
1825 | assert(bs_new->dev == NULL); | |
1826 | assert(bs_new->in_use == 0); | |
1827 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1828 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 1829 | |
4ddc07ca PB |
1830 | tmp = *bs_new; |
1831 | *bs_new = *bs_old; | |
1832 | *bs_old = tmp; | |
a9fc4408 | 1833 | |
4ddc07ca PB |
1834 | /* there are some fields that should not be swapped, move them back */ |
1835 | bdrv_move_feature_fields(&tmp, bs_old); | |
1836 | bdrv_move_feature_fields(bs_old, bs_new); | |
1837 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1838 | |
4ddc07ca PB |
1839 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1840 | assert(bs_new->device_name[0] == '\0'); | |
1841 | ||
1842 | /* Check a few fields that should remain attached to the device */ | |
1843 | assert(bs_new->dev == NULL); | |
1844 | assert(bs_new->job == NULL); | |
1845 | assert(bs_new->in_use == 0); | |
1846 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1847 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 PB |
1848 | |
1849 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1850 | bdrv_rebind(bs_old); |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * Add new bs contents at the top of an image chain while the chain is | |
1855 | * live, while keeping required fields on the top layer. | |
1856 | * | |
1857 | * This will modify the BlockDriverState fields, and swap contents | |
1858 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1859 | * | |
1860 | * bs_new is required to be anonymous. | |
1861 | * | |
1862 | * This function does not create any image files. | |
1863 | */ | |
1864 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1865 | { | |
1866 | bdrv_swap(bs_new, bs_top); | |
1867 | ||
1868 | /* The contents of 'tmp' will become bs_top, as we are | |
1869 | * swapping bs_new and bs_top contents. */ | |
1870 | bs_top->backing_hd = bs_new; | |
1871 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1872 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1873 | bs_new->filename); | |
1874 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1875 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1876 | } |
1877 | ||
4f6fd349 | 1878 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 1879 | { |
fa879d62 | 1880 | assert(!bs->dev); |
3e914655 PB |
1881 | assert(!bs->job); |
1882 | assert(!bs->in_use); | |
4f6fd349 | 1883 | assert(!bs->refcnt); |
e4654d2d | 1884 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 1885 | |
e1b5c52e SH |
1886 | bdrv_close(bs); |
1887 | ||
1b7bdbc1 | 1888 | /* remove from list, if necessary */ |
d22b2f41 | 1889 | bdrv_make_anon(bs); |
34c6f050 | 1890 | |
7267c094 | 1891 | g_free(bs); |
fc01f7e7 FB |
1892 | } |
1893 | ||
fa879d62 MA |
1894 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1895 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1896 | { |
fa879d62 | 1897 | if (bs->dev) { |
18846dee MA |
1898 | return -EBUSY; |
1899 | } | |
fa879d62 | 1900 | bs->dev = dev; |
28a7282a | 1901 | bdrv_iostatus_reset(bs); |
18846dee MA |
1902 | return 0; |
1903 | } | |
1904 | ||
fa879d62 MA |
1905 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1906 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1907 | { |
fa879d62 MA |
1908 | if (bdrv_attach_dev(bs, dev) < 0) { |
1909 | abort(); | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1914 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1915 | { | |
1916 | assert(bs->dev == dev); | |
1917 | bs->dev = NULL; | |
0e49de52 MA |
1918 | bs->dev_ops = NULL; |
1919 | bs->dev_opaque = NULL; | |
29e05f20 | 1920 | bs->buffer_alignment = 512; |
18846dee MA |
1921 | } |
1922 | ||
fa879d62 MA |
1923 | /* TODO change to return DeviceState * when all users are qdevified */ |
1924 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1925 | { |
fa879d62 | 1926 | return bs->dev; |
18846dee MA |
1927 | } |
1928 | ||
0e49de52 MA |
1929 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1930 | void *opaque) | |
1931 | { | |
1932 | bs->dev_ops = ops; | |
1933 | bs->dev_opaque = opaque; | |
1934 | } | |
1935 | ||
32c81a4a PB |
1936 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1937 | enum MonitorEvent ev, | |
1938 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1939 | { |
1940 | QObject *data; | |
1941 | const char *action_str; | |
1942 | ||
1943 | switch (action) { | |
1944 | case BDRV_ACTION_REPORT: | |
1945 | action_str = "report"; | |
1946 | break; | |
1947 | case BDRV_ACTION_IGNORE: | |
1948 | action_str = "ignore"; | |
1949 | break; | |
1950 | case BDRV_ACTION_STOP: | |
1951 | action_str = "stop"; | |
1952 | break; | |
1953 | default: | |
1954 | abort(); | |
1955 | } | |
1956 | ||
1957 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1958 | bdrv->device_name, | |
1959 | action_str, | |
1960 | is_read ? "read" : "write"); | |
32c81a4a | 1961 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1962 | |
1963 | qobject_decref(data); | |
1964 | } | |
1965 | ||
6f382ed2 LC |
1966 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1967 | { | |
1968 | QObject *data; | |
1969 | ||
1970 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1971 | bdrv_get_device_name(bs), ejected); | |
1972 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1973 | ||
1974 | qobject_decref(data); | |
1975 | } | |
1976 | ||
7d4b4ba5 | 1977 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1978 | { |
145feb17 | 1979 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1980 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1981 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1982 | if (tray_was_closed) { |
1983 | /* tray open */ | |
1984 | bdrv_emit_qmp_eject_event(bs, true); | |
1985 | } | |
1986 | if (load) { | |
1987 | /* tray close */ | |
1988 | bdrv_emit_qmp_eject_event(bs, false); | |
1989 | } | |
145feb17 MA |
1990 | } |
1991 | } | |
1992 | ||
2c6942fa MA |
1993 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1994 | { | |
1995 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1996 | } | |
1997 | ||
025ccaa7 PB |
1998 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1999 | { | |
2000 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
2001 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
2002 | } | |
2003 | } | |
2004 | ||
e4def80b MA |
2005 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
2006 | { | |
2007 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
2008 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
2009 | } | |
2010 | return false; | |
2011 | } | |
2012 | ||
145feb17 MA |
2013 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
2014 | { | |
2015 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
2016 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
2017 | } |
2018 | } | |
2019 | ||
f107639a MA |
2020 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
2021 | { | |
2022 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
2023 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
2024 | } | |
2025 | return false; | |
2026 | } | |
2027 | ||
e97fc193 AL |
2028 | /* |
2029 | * Run consistency checks on an image | |
2030 | * | |
e076f338 | 2031 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2032 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2033 | * check are stored in res. |
e97fc193 | 2034 | */ |
4534ff54 | 2035 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
2036 | { |
2037 | if (bs->drv->bdrv_check == NULL) { | |
2038 | return -ENOTSUP; | |
2039 | } | |
2040 | ||
e076f338 | 2041 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2042 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2043 | } |
2044 | ||
8a426614 KW |
2045 | #define COMMIT_BUF_SECTORS 2048 |
2046 | ||
33e3963e FB |
2047 | /* commit COW file into the raw image */ |
2048 | int bdrv_commit(BlockDriverState *bs) | |
2049 | { | |
19cb3738 | 2050 | BlockDriver *drv = bs->drv; |
72706ea4 | 2051 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2052 | int n, ro, open_flags; |
0bce597d | 2053 | int ret = 0; |
72706ea4 | 2054 | uint8_t *buf = NULL; |
c2cba3d9 | 2055 | char filename[PATH_MAX]; |
33e3963e | 2056 | |
19cb3738 FB |
2057 | if (!drv) |
2058 | return -ENOMEDIUM; | |
4dca4b63 NS |
2059 | |
2060 | if (!bs->backing_hd) { | |
2061 | return -ENOTSUP; | |
33e3963e FB |
2062 | } |
2063 | ||
2d3735d3 SH |
2064 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
2065 | return -EBUSY; | |
2066 | } | |
2067 | ||
4dca4b63 | 2068 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2069 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2070 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2071 | open_flags = bs->backing_hd->open_flags; |
2072 | ||
2073 | if (ro) { | |
0bce597d JC |
2074 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2075 | return -EACCES; | |
4dca4b63 | 2076 | } |
ea2384d3 | 2077 | } |
33e3963e | 2078 | |
72706ea4 JC |
2079 | length = bdrv_getlength(bs); |
2080 | if (length < 0) { | |
2081 | ret = length; | |
2082 | goto ro_cleanup; | |
2083 | } | |
2084 | ||
2085 | backing_length = bdrv_getlength(bs->backing_hd); | |
2086 | if (backing_length < 0) { | |
2087 | ret = backing_length; | |
2088 | goto ro_cleanup; | |
2089 | } | |
2090 | ||
2091 | /* If our top snapshot is larger than the backing file image, | |
2092 | * grow the backing file image if possible. If not possible, | |
2093 | * we must return an error */ | |
2094 | if (length > backing_length) { | |
2095 | ret = bdrv_truncate(bs->backing_hd, length); | |
2096 | if (ret < 0) { | |
2097 | goto ro_cleanup; | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | total_sectors = length >> BDRV_SECTOR_BITS; | |
7267c094 | 2102 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
2103 | |
2104 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2105 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2106 | if (ret < 0) { | |
2107 | goto ro_cleanup; | |
2108 | } | |
2109 | if (ret) { | |
dabfa6cc KW |
2110 | ret = bdrv_read(bs, sector, buf, n); |
2111 | if (ret < 0) { | |
8a426614 KW |
2112 | goto ro_cleanup; |
2113 | } | |
2114 | ||
dabfa6cc KW |
2115 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2116 | if (ret < 0) { | |
8a426614 KW |
2117 | goto ro_cleanup; |
2118 | } | |
ea2384d3 | 2119 | } |
33e3963e | 2120 | } |
95389c86 | 2121 | |
1d44952f CH |
2122 | if (drv->bdrv_make_empty) { |
2123 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2124 | if (ret < 0) { |
2125 | goto ro_cleanup; | |
2126 | } | |
1d44952f CH |
2127 | bdrv_flush(bs); |
2128 | } | |
95389c86 | 2129 | |
3f5075ae CH |
2130 | /* |
2131 | * Make sure all data we wrote to the backing device is actually | |
2132 | * stable on disk. | |
2133 | */ | |
dabfa6cc | 2134 | if (bs->backing_hd) { |
3f5075ae | 2135 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2136 | } |
4dca4b63 | 2137 | |
dabfa6cc | 2138 | ret = 0; |
4dca4b63 | 2139 | ro_cleanup: |
7267c094 | 2140 | g_free(buf); |
4dca4b63 NS |
2141 | |
2142 | if (ro) { | |
0bce597d JC |
2143 | /* ignoring error return here */ |
2144 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2145 | } |
2146 | ||
1d44952f | 2147 | return ret; |
33e3963e FB |
2148 | } |
2149 | ||
e8877497 | 2150 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2151 | { |
2152 | BlockDriverState *bs; | |
2153 | ||
dc364f4c | 2154 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
272d2d8e JC |
2155 | if (bs->drv && bs->backing_hd) { |
2156 | int ret = bdrv_commit(bs); | |
2157 | if (ret < 0) { | |
2158 | return ret; | |
2159 | } | |
e8877497 | 2160 | } |
6ab4b5ab | 2161 | } |
e8877497 | 2162 | return 0; |
6ab4b5ab MA |
2163 | } |
2164 | ||
dbffbdcf SH |
2165 | /** |
2166 | * Remove an active request from the tracked requests list | |
2167 | * | |
2168 | * This function should be called when a tracked request is completing. | |
2169 | */ | |
2170 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2171 | { | |
2172 | QLIST_REMOVE(req, list); | |
f4658285 | 2173 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2174 | } |
2175 | ||
2176 | /** | |
2177 | * Add an active request to the tracked requests list | |
2178 | */ | |
2179 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2180 | BlockDriverState *bs, | |
2181 | int64_t sector_num, | |
2182 | int nb_sectors, bool is_write) | |
2183 | { | |
2184 | *req = (BdrvTrackedRequest){ | |
2185 | .bs = bs, | |
2186 | .sector_num = sector_num, | |
2187 | .nb_sectors = nb_sectors, | |
2188 | .is_write = is_write, | |
5f8b6491 | 2189 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
2190 | }; |
2191 | ||
f4658285 SH |
2192 | qemu_co_queue_init(&req->wait_queue); |
2193 | ||
dbffbdcf SH |
2194 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2195 | } | |
2196 | ||
d83947ac SH |
2197 | /** |
2198 | * Round a region to cluster boundaries | |
2199 | */ | |
343bded4 PB |
2200 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2201 | int64_t sector_num, int nb_sectors, | |
2202 | int64_t *cluster_sector_num, | |
2203 | int *cluster_nb_sectors) | |
d83947ac SH |
2204 | { |
2205 | BlockDriverInfo bdi; | |
2206 | ||
2207 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2208 | *cluster_sector_num = sector_num; | |
2209 | *cluster_nb_sectors = nb_sectors; | |
2210 | } else { | |
2211 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2212 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2213 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2214 | nb_sectors, c); | |
2215 | } | |
2216 | } | |
2217 | ||
f4658285 SH |
2218 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
2219 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
2220 | /* aaaa bbbb */ |
2221 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
2222 | return false; | |
2223 | } | |
2224 | /* bbbb aaaa */ | |
2225 | if (req->sector_num >= sector_num + nb_sectors) { | |
2226 | return false; | |
2227 | } | |
2228 | return true; | |
f4658285 SH |
2229 | } |
2230 | ||
2231 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
2232 | int64_t sector_num, int nb_sectors) | |
2233 | { | |
2234 | BdrvTrackedRequest *req; | |
d83947ac SH |
2235 | int64_t cluster_sector_num; |
2236 | int cluster_nb_sectors; | |
f4658285 SH |
2237 | bool retry; |
2238 | ||
d83947ac SH |
2239 | /* If we touch the same cluster it counts as an overlap. This guarantees |
2240 | * that allocating writes will be serialized and not race with each other | |
2241 | * for the same cluster. For example, in copy-on-read it ensures that the | |
2242 | * CoR read and write operations are atomic and guest writes cannot | |
2243 | * interleave between them. | |
2244 | */ | |
343bded4 PB |
2245 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2246 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 2247 | |
f4658285 SH |
2248 | do { |
2249 | retry = false; | |
2250 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
2251 | if (tracked_request_overlaps(req, cluster_sector_num, |
2252 | cluster_nb_sectors)) { | |
5f8b6491 SH |
2253 | /* Hitting this means there was a reentrant request, for |
2254 | * example, a block driver issuing nested requests. This must | |
2255 | * never happen since it means deadlock. | |
2256 | */ | |
2257 | assert(qemu_coroutine_self() != req->co); | |
2258 | ||
f4658285 SH |
2259 | qemu_co_queue_wait(&req->wait_queue); |
2260 | retry = true; | |
2261 | break; | |
2262 | } | |
2263 | } | |
2264 | } while (retry); | |
2265 | } | |
2266 | ||
756e6736 KW |
2267 | /* |
2268 | * Return values: | |
2269 | * 0 - success | |
2270 | * -EINVAL - backing format specified, but no file | |
2271 | * -ENOSPC - can't update the backing file because no space is left in the | |
2272 | * image file header | |
2273 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2274 | */ | |
2275 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2276 | const char *backing_file, const char *backing_fmt) | |
2277 | { | |
2278 | BlockDriver *drv = bs->drv; | |
469ef350 | 2279 | int ret; |
756e6736 | 2280 | |
5f377794 PB |
2281 | /* Backing file format doesn't make sense without a backing file */ |
2282 | if (backing_fmt && !backing_file) { | |
2283 | return -EINVAL; | |
2284 | } | |
2285 | ||
756e6736 | 2286 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2287 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2288 | } else { |
469ef350 | 2289 | ret = -ENOTSUP; |
756e6736 | 2290 | } |
469ef350 PB |
2291 | |
2292 | if (ret == 0) { | |
2293 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2294 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2295 | } | |
2296 | return ret; | |
756e6736 KW |
2297 | } |
2298 | ||
6ebdcee2 JC |
2299 | /* |
2300 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2301 | * | |
2302 | * active is the current topmost image. | |
2303 | * | |
2304 | * Returns NULL if bs is not found in active's image chain, | |
2305 | * or if active == bs. | |
2306 | */ | |
2307 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2308 | BlockDriverState *bs) | |
2309 | { | |
2310 | BlockDriverState *overlay = NULL; | |
2311 | BlockDriverState *intermediate; | |
2312 | ||
2313 | assert(active != NULL); | |
2314 | assert(bs != NULL); | |
2315 | ||
2316 | /* if bs is the same as active, then by definition it has no overlay | |
2317 | */ | |
2318 | if (active == bs) { | |
2319 | return NULL; | |
2320 | } | |
2321 | ||
2322 | intermediate = active; | |
2323 | while (intermediate->backing_hd) { | |
2324 | if (intermediate->backing_hd == bs) { | |
2325 | overlay = intermediate; | |
2326 | break; | |
2327 | } | |
2328 | intermediate = intermediate->backing_hd; | |
2329 | } | |
2330 | ||
2331 | return overlay; | |
2332 | } | |
2333 | ||
2334 | typedef struct BlkIntermediateStates { | |
2335 | BlockDriverState *bs; | |
2336 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2337 | } BlkIntermediateStates; | |
2338 | ||
2339 | ||
2340 | /* | |
2341 | * Drops images above 'base' up to and including 'top', and sets the image | |
2342 | * above 'top' to have base as its backing file. | |
2343 | * | |
2344 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2345 | * information in 'bs' can be properly updated. | |
2346 | * | |
2347 | * E.g., this will convert the following chain: | |
2348 | * bottom <- base <- intermediate <- top <- active | |
2349 | * | |
2350 | * to | |
2351 | * | |
2352 | * bottom <- base <- active | |
2353 | * | |
2354 | * It is allowed for bottom==base, in which case it converts: | |
2355 | * | |
2356 | * base <- intermediate <- top <- active | |
2357 | * | |
2358 | * to | |
2359 | * | |
2360 | * base <- active | |
2361 | * | |
2362 | * Error conditions: | |
2363 | * if active == top, that is considered an error | |
2364 | * | |
2365 | */ | |
2366 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2367 | BlockDriverState *base) | |
2368 | { | |
2369 | BlockDriverState *intermediate; | |
2370 | BlockDriverState *base_bs = NULL; | |
2371 | BlockDriverState *new_top_bs = NULL; | |
2372 | BlkIntermediateStates *intermediate_state, *next; | |
2373 | int ret = -EIO; | |
2374 | ||
2375 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2376 | QSIMPLEQ_INIT(&states_to_delete); | |
2377 | ||
2378 | if (!top->drv || !base->drv) { | |
2379 | goto exit; | |
2380 | } | |
2381 | ||
2382 | new_top_bs = bdrv_find_overlay(active, top); | |
2383 | ||
2384 | if (new_top_bs == NULL) { | |
2385 | /* we could not find the image above 'top', this is an error */ | |
2386 | goto exit; | |
2387 | } | |
2388 | ||
2389 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2390 | * to do, no intermediate images */ | |
2391 | if (new_top_bs->backing_hd == base) { | |
2392 | ret = 0; | |
2393 | goto exit; | |
2394 | } | |
2395 | ||
2396 | intermediate = top; | |
2397 | ||
2398 | /* now we will go down through the list, and add each BDS we find | |
2399 | * into our deletion queue, until we hit the 'base' | |
2400 | */ | |
2401 | while (intermediate) { | |
2402 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2403 | intermediate_state->bs = intermediate; | |
2404 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2405 | ||
2406 | if (intermediate->backing_hd == base) { | |
2407 | base_bs = intermediate->backing_hd; | |
2408 | break; | |
2409 | } | |
2410 | intermediate = intermediate->backing_hd; | |
2411 | } | |
2412 | if (base_bs == NULL) { | |
2413 | /* something went wrong, we did not end at the base. safely | |
2414 | * unravel everything, and exit with error */ | |
2415 | goto exit; | |
2416 | } | |
2417 | ||
2418 | /* success - we can delete the intermediate states, and link top->base */ | |
2419 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2420 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2421 | if (ret) { | |
2422 | goto exit; | |
2423 | } | |
2424 | new_top_bs->backing_hd = base_bs; | |
2425 | ||
2426 | ||
2427 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2428 | /* so that bdrv_close() does not recursively close the chain */ | |
2429 | intermediate_state->bs->backing_hd = NULL; | |
4f6fd349 | 2430 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2431 | } |
2432 | ret = 0; | |
2433 | ||
2434 | exit: | |
2435 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2436 | g_free(intermediate_state); | |
2437 | } | |
2438 | return ret; | |
2439 | } | |
2440 | ||
2441 | ||
71d0770c AL |
2442 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2443 | size_t size) | |
2444 | { | |
2445 | int64_t len; | |
2446 | ||
2447 | if (!bdrv_is_inserted(bs)) | |
2448 | return -ENOMEDIUM; | |
2449 | ||
2450 | if (bs->growable) | |
2451 | return 0; | |
2452 | ||
2453 | len = bdrv_getlength(bs); | |
2454 | ||
fbb7b4e0 KW |
2455 | if (offset < 0) |
2456 | return -EIO; | |
2457 | ||
2458 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2459 | return -EIO; |
2460 | ||
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2465 | int nb_sectors) | |
2466 | { | |
eb5a3165 JS |
2467 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2468 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2469 | } |
2470 | ||
1c9805a3 SH |
2471 | typedef struct RwCo { |
2472 | BlockDriverState *bs; | |
2473 | int64_t sector_num; | |
2474 | int nb_sectors; | |
2475 | QEMUIOVector *qiov; | |
2476 | bool is_write; | |
2477 | int ret; | |
4105eaaa | 2478 | BdrvRequestFlags flags; |
1c9805a3 SH |
2479 | } RwCo; |
2480 | ||
2481 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2482 | { |
1c9805a3 | 2483 | RwCo *rwco = opaque; |
ea2384d3 | 2484 | |
1c9805a3 SH |
2485 | if (!rwco->is_write) { |
2486 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2487 | rwco->nb_sectors, rwco->qiov, |
2488 | rwco->flags); | |
1c9805a3 SH |
2489 | } else { |
2490 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2491 | rwco->nb_sectors, rwco->qiov, |
2492 | rwco->flags); | |
1c9805a3 SH |
2493 | } |
2494 | } | |
e7a8a783 | 2495 | |
1c9805a3 | 2496 | /* |
8d3b1a2d | 2497 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2498 | */ |
8d3b1a2d | 2499 | static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num, |
4105eaaa PL |
2500 | QEMUIOVector *qiov, bool is_write, |
2501 | BdrvRequestFlags flags) | |
1c9805a3 | 2502 | { |
1c9805a3 SH |
2503 | Coroutine *co; |
2504 | RwCo rwco = { | |
2505 | .bs = bs, | |
2506 | .sector_num = sector_num, | |
8d3b1a2d KW |
2507 | .nb_sectors = qiov->size >> BDRV_SECTOR_BITS, |
2508 | .qiov = qiov, | |
1c9805a3 SH |
2509 | .is_write = is_write, |
2510 | .ret = NOT_DONE, | |
4105eaaa | 2511 | .flags = flags, |
1c9805a3 | 2512 | }; |
8d3b1a2d | 2513 | assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0); |
e7a8a783 | 2514 | |
498e386c ZYW |
2515 | /** |
2516 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2517 | * will not fire; so the I/O throttling function has to be disabled here | |
2518 | * if it has been enabled. | |
2519 | */ | |
2520 | if (bs->io_limits_enabled) { | |
2521 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2522 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2523 | bdrv_io_limits_disable(bs); | |
2524 | } | |
2525 | ||
1c9805a3 SH |
2526 | if (qemu_in_coroutine()) { |
2527 | /* Fast-path if already in coroutine context */ | |
2528 | bdrv_rw_co_entry(&rwco); | |
2529 | } else { | |
2530 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2531 | qemu_coroutine_enter(co, &rwco); | |
2532 | while (rwco.ret == NOT_DONE) { | |
2533 | qemu_aio_wait(); | |
2534 | } | |
2535 | } | |
2536 | return rwco.ret; | |
2537 | } | |
b338082b | 2538 | |
8d3b1a2d KW |
2539 | /* |
2540 | * Process a synchronous request using coroutines | |
2541 | */ | |
2542 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2543 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2544 | { |
2545 | QEMUIOVector qiov; | |
2546 | struct iovec iov = { | |
2547 | .iov_base = (void *)buf, | |
2548 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2549 | }; | |
2550 | ||
2551 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4105eaaa | 2552 | return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags); |
8d3b1a2d KW |
2553 | } |
2554 | ||
1c9805a3 SH |
2555 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2556 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2557 | uint8_t *buf, int nb_sectors) | |
2558 | { | |
4105eaaa | 2559 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2560 | } |
2561 | ||
07d27a44 MA |
2562 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2563 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2564 | uint8_t *buf, int nb_sectors) | |
2565 | { | |
2566 | bool enabled; | |
2567 | int ret; | |
2568 | ||
2569 | enabled = bs->io_limits_enabled; | |
2570 | bs->io_limits_enabled = false; | |
4e7395e8 | 2571 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2572 | bs->io_limits_enabled = enabled; |
2573 | return ret; | |
2574 | } | |
2575 | ||
5fafdf24 | 2576 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2577 | -EIO generic I/O error (may happen for all errors) |
2578 | -ENOMEDIUM No media inserted. | |
2579 | -EINVAL Invalid sector number or nb_sectors | |
2580 | -EACCES Trying to write a read-only device | |
2581 | */ | |
5fafdf24 | 2582 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2583 | const uint8_t *buf, int nb_sectors) |
2584 | { | |
4105eaaa | 2585 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2586 | } |
2587 | ||
8d3b1a2d KW |
2588 | int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov) |
2589 | { | |
4105eaaa PL |
2590 | return bdrv_rwv_co(bs, sector_num, qiov, true, 0); |
2591 | } | |
2592 | ||
aa7bfbff PL |
2593 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2594 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2595 | { |
2596 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2597 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2598 | } |
2599 | ||
d75cbb5e PL |
2600 | /* |
2601 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2602 | * The operation is sped up by checking the block status and only writing | |
2603 | * zeroes to the device if they currently do not return zeroes. Optional | |
2604 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2605 | * | |
2606 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2607 | */ | |
2608 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2609 | { | |
2610 | int64_t target_size = bdrv_getlength(bs) / BDRV_SECTOR_SIZE; | |
2611 | int64_t ret, nb_sectors, sector_num = 0; | |
2612 | int n; | |
2613 | ||
2614 | for (;;) { | |
2615 | nb_sectors = target_size - sector_num; | |
2616 | if (nb_sectors <= 0) { | |
2617 | return 0; | |
2618 | } | |
2619 | if (nb_sectors > INT_MAX) { | |
2620 | nb_sectors = INT_MAX; | |
2621 | } | |
2622 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2623 | if (ret < 0) { |
2624 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2625 | sector_num, strerror(-ret)); | |
2626 | return ret; | |
2627 | } | |
d75cbb5e PL |
2628 | if (ret & BDRV_BLOCK_ZERO) { |
2629 | sector_num += n; | |
2630 | continue; | |
2631 | } | |
2632 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2633 | if (ret < 0) { | |
2634 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2635 | sector_num, strerror(-ret)); | |
2636 | return ret; | |
2637 | } | |
2638 | sector_num += n; | |
2639 | } | |
2640 | } | |
2641 | ||
eda578e5 AL |
2642 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2643 | void *buf, int count1) | |
83f64091 | 2644 | { |
6ea44308 | 2645 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2646 | int len, nb_sectors, count; |
2647 | int64_t sector_num; | |
9a8c4cce | 2648 | int ret; |
83f64091 FB |
2649 | |
2650 | count = count1; | |
2651 | /* first read to align to sector start */ | |
6ea44308 | 2652 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2653 | if (len > count) |
2654 | len = count; | |
6ea44308 | 2655 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2656 | if (len > 0) { |
9a8c4cce KW |
2657 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2658 | return ret; | |
6ea44308 | 2659 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2660 | count -= len; |
2661 | if (count == 0) | |
2662 | return count1; | |
2663 | sector_num++; | |
2664 | buf += len; | |
2665 | } | |
2666 | ||
2667 | /* read the sectors "in place" */ | |
6ea44308 | 2668 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2669 | if (nb_sectors > 0) { |
9a8c4cce KW |
2670 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2671 | return ret; | |
83f64091 | 2672 | sector_num += nb_sectors; |
6ea44308 | 2673 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2674 | buf += len; |
2675 | count -= len; | |
2676 | } | |
2677 | ||
2678 | /* add data from the last sector */ | |
2679 | if (count > 0) { | |
9a8c4cce KW |
2680 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2681 | return ret; | |
83f64091 FB |
2682 | memcpy(buf, tmp_buf, count); |
2683 | } | |
2684 | return count1; | |
2685 | } | |
2686 | ||
8d3b1a2d | 2687 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2688 | { |
6ea44308 | 2689 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2690 | int len, nb_sectors, count; |
2691 | int64_t sector_num; | |
9a8c4cce | 2692 | int ret; |
83f64091 | 2693 | |
8d3b1a2d KW |
2694 | count = qiov->size; |
2695 | ||
83f64091 | 2696 | /* first write to align to sector start */ |
6ea44308 | 2697 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2698 | if (len > count) |
2699 | len = count; | |
6ea44308 | 2700 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2701 | if (len > 0) { |
9a8c4cce KW |
2702 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2703 | return ret; | |
8d3b1a2d KW |
2704 | qemu_iovec_to_buf(qiov, 0, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), |
2705 | len); | |
9a8c4cce KW |
2706 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2707 | return ret; | |
83f64091 FB |
2708 | count -= len; |
2709 | if (count == 0) | |
8d3b1a2d | 2710 | return qiov->size; |
83f64091 | 2711 | sector_num++; |
83f64091 FB |
2712 | } |
2713 | ||
2714 | /* write the sectors "in place" */ | |
6ea44308 | 2715 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2716 | if (nb_sectors > 0) { |
8d3b1a2d KW |
2717 | QEMUIOVector qiov_inplace; |
2718 | ||
2719 | qemu_iovec_init(&qiov_inplace, qiov->niov); | |
2720 | qemu_iovec_concat(&qiov_inplace, qiov, len, | |
2721 | nb_sectors << BDRV_SECTOR_BITS); | |
2722 | ret = bdrv_writev(bs, sector_num, &qiov_inplace); | |
2723 | qemu_iovec_destroy(&qiov_inplace); | |
2724 | if (ret < 0) { | |
9a8c4cce | 2725 | return ret; |
8d3b1a2d KW |
2726 | } |
2727 | ||
83f64091 | 2728 | sector_num += nb_sectors; |
6ea44308 | 2729 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2730 | count -= len; |
2731 | } | |
2732 | ||
2733 | /* add data from the last sector */ | |
2734 | if (count > 0) { | |
9a8c4cce KW |
2735 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2736 | return ret; | |
8d3b1a2d | 2737 | qemu_iovec_to_buf(qiov, qiov->size - count, tmp_buf, count); |
9a8c4cce KW |
2738 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2739 | return ret; | |
83f64091 | 2740 | } |
8d3b1a2d KW |
2741 | return qiov->size; |
2742 | } | |
2743 | ||
2744 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
2745 | const void *buf, int count1) | |
2746 | { | |
2747 | QEMUIOVector qiov; | |
2748 | struct iovec iov = { | |
2749 | .iov_base = (void *) buf, | |
2750 | .iov_len = count1, | |
2751 | }; | |
2752 | ||
2753 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2754 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2755 | } |
83f64091 | 2756 | |
f08145fe KW |
2757 | /* |
2758 | * Writes to the file and ensures that no writes are reordered across this | |
2759 | * request (acts as a barrier) | |
2760 | * | |
2761 | * Returns 0 on success, -errno in error cases. | |
2762 | */ | |
2763 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2764 | const void *buf, int count) | |
2765 | { | |
2766 | int ret; | |
2767 | ||
2768 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2769 | if (ret < 0) { | |
2770 | return ret; | |
2771 | } | |
2772 | ||
f05fa4ad PB |
2773 | /* No flush needed for cache modes that already do it */ |
2774 | if (bs->enable_write_cache) { | |
f08145fe KW |
2775 | bdrv_flush(bs); |
2776 | } | |
2777 | ||
2778 | return 0; | |
2779 | } | |
2780 | ||
470c0504 | 2781 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2782 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2783 | { | |
2784 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2785 | * their read buffer while the operation is in progress do not end up | |
2786 | * modifying the image file. This is critical for zero-copy guest I/O | |
2787 | * where anything might happen inside guest memory. | |
2788 | */ | |
2789 | void *bounce_buffer; | |
2790 | ||
79c053bd | 2791 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2792 | struct iovec iov; |
2793 | QEMUIOVector bounce_qiov; | |
2794 | int64_t cluster_sector_num; | |
2795 | int cluster_nb_sectors; | |
2796 | size_t skip_bytes; | |
2797 | int ret; | |
2798 | ||
2799 | /* Cover entire cluster so no additional backing file I/O is required when | |
2800 | * allocating cluster in the image file. | |
2801 | */ | |
343bded4 PB |
2802 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2803 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2804 | |
470c0504 SH |
2805 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2806 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2807 | |
2808 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2809 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2810 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2811 | ||
79c053bd SH |
2812 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2813 | &bounce_qiov); | |
ab185921 SH |
2814 | if (ret < 0) { |
2815 | goto err; | |
2816 | } | |
2817 | ||
79c053bd SH |
2818 | if (drv->bdrv_co_write_zeroes && |
2819 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 2820 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 2821 | cluster_nb_sectors, 0); |
79c053bd | 2822 | } else { |
f05fa4ad PB |
2823 | /* This does not change the data on the disk, it is not necessary |
2824 | * to flush even in cache=writethrough mode. | |
2825 | */ | |
79c053bd | 2826 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2827 | &bounce_qiov); |
79c053bd SH |
2828 | } |
2829 | ||
ab185921 SH |
2830 | if (ret < 0) { |
2831 | /* It might be okay to ignore write errors for guest requests. If this | |
2832 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2833 | * Simply report it in all cases. | |
2834 | */ | |
2835 | goto err; | |
2836 | } | |
2837 | ||
2838 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2839 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2840 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2841 | |
2842 | err: | |
2843 | qemu_vfree(bounce_buffer); | |
2844 | return ret; | |
2845 | } | |
2846 | ||
c5fbe571 SH |
2847 | /* |
2848 | * Handle a read request in coroutine context | |
2849 | */ | |
2850 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2851 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2852 | BdrvRequestFlags flags) | |
da1fa91d KW |
2853 | { |
2854 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2855 | BdrvTrackedRequest req; |
2856 | int ret; | |
da1fa91d | 2857 | |
da1fa91d KW |
2858 | if (!drv) { |
2859 | return -ENOMEDIUM; | |
2860 | } | |
2861 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2862 | return -EIO; | |
2863 | } | |
2864 | ||
f4658285 | 2865 | if (bs->copy_on_read) { |
470c0504 SH |
2866 | flags |= BDRV_REQ_COPY_ON_READ; |
2867 | } | |
2868 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2869 | bs->copy_on_read_in_flight++; | |
2870 | } | |
2871 | ||
2872 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2873 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2874 | } | |
2875 | ||
cc0681c4 BC |
2876 | /* throttling disk I/O */ |
2877 | if (bs->io_limits_enabled) { | |
2878 | bdrv_io_limits_intercept(bs, nb_sectors, false); | |
2879 | } | |
2880 | ||
dbffbdcf | 2881 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2882 | |
470c0504 | 2883 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2884 | int pnum; |
2885 | ||
bdad13b9 | 2886 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
2887 | if (ret < 0) { |
2888 | goto out; | |
2889 | } | |
2890 | ||
2891 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2892 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2893 | goto out; |
2894 | } | |
2895 | } | |
2896 | ||
893a8f62 MK |
2897 | if (!(bs->zero_beyond_eof && bs->growable)) { |
2898 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
2899 | } else { | |
2900 | /* Read zeros after EOF of growable BDSes */ | |
2901 | int64_t len, total_sectors, max_nb_sectors; | |
2902 | ||
2903 | len = bdrv_getlength(bs); | |
2904 | if (len < 0) { | |
2905 | ret = len; | |
2906 | goto out; | |
2907 | } | |
2908 | ||
d055a1fe | 2909 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
893a8f62 MK |
2910 | max_nb_sectors = MAX(0, total_sectors - sector_num); |
2911 | if (max_nb_sectors > 0) { | |
2912 | ret = drv->bdrv_co_readv(bs, sector_num, | |
2913 | MIN(nb_sectors, max_nb_sectors), qiov); | |
2914 | } else { | |
2915 | ret = 0; | |
2916 | } | |
2917 | ||
2918 | /* Reading beyond end of file is supposed to produce zeroes */ | |
2919 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
2920 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
2921 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
2922 | BDRV_SECTOR_SIZE; | |
2923 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
2924 | } | |
2925 | } | |
ab185921 SH |
2926 | |
2927 | out: | |
dbffbdcf | 2928 | tracked_request_end(&req); |
470c0504 SH |
2929 | |
2930 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2931 | bs->copy_on_read_in_flight--; | |
2932 | } | |
2933 | ||
dbffbdcf | 2934 | return ret; |
da1fa91d KW |
2935 | } |
2936 | ||
c5fbe571 | 2937 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2938 | int nb_sectors, QEMUIOVector *qiov) |
2939 | { | |
c5fbe571 | 2940 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2941 | |
470c0504 SH |
2942 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2943 | } | |
2944 | ||
2945 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2946 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2947 | { | |
2948 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2949 | ||
2950 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2951 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2952 | } |
2953 | ||
c31cb707 PL |
2954 | /* if no limit is specified in the BlockLimits use a default |
2955 | * of 32768 512-byte sectors (16 MiB) per request. | |
2956 | */ | |
2957 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
2958 | ||
f08f2dda | 2959 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 2960 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
2961 | { |
2962 | BlockDriver *drv = bs->drv; | |
2963 | QEMUIOVector qiov; | |
c31cb707 PL |
2964 | struct iovec iov = {0}; |
2965 | int ret = 0; | |
f08f2dda | 2966 | |
c31cb707 PL |
2967 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
2968 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 2969 | |
c31cb707 PL |
2970 | while (nb_sectors > 0 && !ret) { |
2971 | int num = nb_sectors; | |
2972 | ||
b8d71c09 PB |
2973 | /* Align request. Block drivers can expect the "bulk" of the request |
2974 | * to be aligned. | |
2975 | */ | |
2976 | if (bs->bl.write_zeroes_alignment | |
2977 | && num > bs->bl.write_zeroes_alignment) { | |
2978 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
2979 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 2980 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
2981 | num -= sector_num % bs->bl.write_zeroes_alignment; |
2982 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
2983 | /* Shorten the request to the last aligned sector. num cannot | |
2984 | * underflow because num > bs->bl.write_zeroes_alignment. | |
2985 | */ | |
2986 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 2987 | } |
621f0589 | 2988 | } |
f08f2dda | 2989 | |
c31cb707 PL |
2990 | /* limit request size */ |
2991 | if (num > max_write_zeroes) { | |
2992 | num = max_write_zeroes; | |
2993 | } | |
2994 | ||
2995 | ret = -ENOTSUP; | |
2996 | /* First try the efficient write zeroes operation */ | |
2997 | if (drv->bdrv_co_write_zeroes) { | |
2998 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
2999 | } | |
3000 | ||
3001 | if (ret == -ENOTSUP) { | |
3002 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
3003 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
3004 | if (iov.iov_base == NULL) { | |
b8d71c09 PB |
3005 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3006 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); | |
c31cb707 PL |
3007 | } |
3008 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3009 | |
c31cb707 | 3010 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3011 | |
3012 | /* Keep bounce buffer around if it is big enough for all | |
3013 | * all future requests. | |
3014 | */ | |
3015 | if (num < max_write_zeroes) { | |
3016 | qemu_vfree(iov.iov_base); | |
3017 | iov.iov_base = NULL; | |
3018 | } | |
c31cb707 PL |
3019 | } |
3020 | ||
3021 | sector_num += num; | |
3022 | nb_sectors -= num; | |
3023 | } | |
f08f2dda SH |
3024 | |
3025 | qemu_vfree(iov.iov_base); | |
3026 | return ret; | |
3027 | } | |
3028 | ||
c5fbe571 SH |
3029 | /* |
3030 | * Handle a write request in coroutine context | |
3031 | */ | |
3032 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
3033 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
3034 | BdrvRequestFlags flags) | |
c5fbe571 SH |
3035 | { |
3036 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3037 | BdrvTrackedRequest req; |
6b7cb247 | 3038 | int ret; |
da1fa91d KW |
3039 | |
3040 | if (!bs->drv) { | |
3041 | return -ENOMEDIUM; | |
3042 | } | |
3043 | if (bs->read_only) { | |
3044 | return -EACCES; | |
3045 | } | |
3046 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
3047 | return -EIO; | |
3048 | } | |
3049 | ||
470c0504 | 3050 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
3051 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
3052 | } | |
3053 | ||
cc0681c4 BC |
3054 | /* throttling disk I/O */ |
3055 | if (bs->io_limits_enabled) { | |
3056 | bdrv_io_limits_intercept(bs, nb_sectors, true); | |
3057 | } | |
3058 | ||
dbffbdcf SH |
3059 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
3060 | ||
d616b224 SH |
3061 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req); |
3062 | ||
3063 | if (ret < 0) { | |
3064 | /* Do nothing, write notifier decided to fail this request */ | |
3065 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
aa7bfbff | 3066 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda SH |
3067 | } else { |
3068 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
3069 | } | |
6b7cb247 | 3070 | |
f05fa4ad PB |
3071 | if (ret == 0 && !bs->enable_write_cache) { |
3072 | ret = bdrv_co_flush(bs); | |
3073 | } | |
3074 | ||
e4654d2d | 3075 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
3076 | |
3077 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
3078 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
3079 | } | |
df2a6f29 PB |
3080 | if (bs->growable && ret >= 0) { |
3081 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
3082 | } | |
da1fa91d | 3083 | |
dbffbdcf SH |
3084 | tracked_request_end(&req); |
3085 | ||
6b7cb247 | 3086 | return ret; |
da1fa91d KW |
3087 | } |
3088 | ||
c5fbe571 SH |
3089 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3090 | int nb_sectors, QEMUIOVector *qiov) | |
3091 | { | |
3092 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3093 | ||
f08f2dda SH |
3094 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3095 | } | |
3096 | ||
3097 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3098 | int64_t sector_num, int nb_sectors, |
3099 | BdrvRequestFlags flags) | |
f08f2dda | 3100 | { |
94d6ff21 | 3101 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3102 | |
d32f35cb PL |
3103 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3104 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3105 | } | |
3106 | ||
f08f2dda | 3107 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3108 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3109 | } |
3110 | ||
83f64091 FB |
3111 | /** |
3112 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3113 | */ | |
3114 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3115 | { | |
3116 | BlockDriver *drv = bs->drv; | |
51762288 | 3117 | int ret; |
83f64091 | 3118 | if (!drv) |
19cb3738 | 3119 | return -ENOMEDIUM; |
83f64091 FB |
3120 | if (!drv->bdrv_truncate) |
3121 | return -ENOTSUP; | |
59f2689d NS |
3122 | if (bs->read_only) |
3123 | return -EACCES; | |
8591675f MT |
3124 | if (bdrv_in_use(bs)) |
3125 | return -EBUSY; | |
51762288 SH |
3126 | ret = drv->bdrv_truncate(bs, offset); |
3127 | if (ret == 0) { | |
3128 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3129 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3130 | } |
3131 | return ret; | |
83f64091 FB |
3132 | } |
3133 | ||
4a1d5e1f FZ |
3134 | /** |
3135 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3136 | * allocated space. Return < 0 if error or unknown. | |
3137 | */ | |
3138 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3139 | { | |
3140 | BlockDriver *drv = bs->drv; | |
3141 | if (!drv) { | |
3142 | return -ENOMEDIUM; | |
3143 | } | |
3144 | if (drv->bdrv_get_allocated_file_size) { | |
3145 | return drv->bdrv_get_allocated_file_size(bs); | |
3146 | } | |
3147 | if (bs->file) { | |
3148 | return bdrv_get_allocated_file_size(bs->file); | |
3149 | } | |
3150 | return -ENOTSUP; | |
3151 | } | |
3152 | ||
83f64091 FB |
3153 | /** |
3154 | * Length of a file in bytes. Return < 0 if error or unknown. | |
3155 | */ | |
3156 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3157 | { | |
3158 | BlockDriver *drv = bs->drv; | |
3159 | if (!drv) | |
19cb3738 | 3160 | return -ENOMEDIUM; |
51762288 | 3161 | |
b94a2610 KW |
3162 | if (drv->has_variable_length) { |
3163 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3164 | if (ret < 0) { | |
3165 | return ret; | |
46a4e4e6 | 3166 | } |
83f64091 | 3167 | } |
46a4e4e6 | 3168 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3169 | } |
3170 | ||
19cb3738 | 3171 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3172 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3173 | { |
19cb3738 FB |
3174 | int64_t length; |
3175 | length = bdrv_getlength(bs); | |
3176 | if (length < 0) | |
3177 | length = 0; | |
3178 | else | |
6ea44308 | 3179 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 3180 | *nb_sectors_ptr = length; |
fc01f7e7 | 3181 | } |
cf98951b | 3182 | |
ff06f5f3 PB |
3183 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3184 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3185 | { |
3186 | bs->on_read_error = on_read_error; | |
3187 | bs->on_write_error = on_write_error; | |
3188 | } | |
3189 | ||
1ceee0d5 | 3190 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3191 | { |
3192 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3193 | } | |
3194 | ||
3e1caa5f PB |
3195 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3196 | { | |
3197 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3198 | ||
3199 | switch (on_err) { | |
3200 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
3201 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
3202 | case BLOCKDEV_ON_ERROR_STOP: | |
3203 | return BDRV_ACTION_STOP; | |
3204 | case BLOCKDEV_ON_ERROR_REPORT: | |
3205 | return BDRV_ACTION_REPORT; | |
3206 | case BLOCKDEV_ON_ERROR_IGNORE: | |
3207 | return BDRV_ACTION_IGNORE; | |
3208 | default: | |
3209 | abort(); | |
3210 | } | |
3211 | } | |
3212 | ||
3213 | /* This is done by device models because, while the block layer knows | |
3214 | * about the error, it does not know whether an operation comes from | |
3215 | * the device or the block layer (from a job, for example). | |
3216 | */ | |
3217 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3218 | bool is_read, int error) | |
3219 | { | |
3220 | assert(error >= 0); | |
32c81a4a | 3221 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
3222 | if (action == BDRV_ACTION_STOP) { |
3223 | vm_stop(RUN_STATE_IO_ERROR); | |
3224 | bdrv_iostatus_set_err(bs, error); | |
3225 | } | |
3226 | } | |
3227 | ||
b338082b FB |
3228 | int bdrv_is_read_only(BlockDriverState *bs) |
3229 | { | |
3230 | return bs->read_only; | |
3231 | } | |
3232 | ||
985a03b0 TS |
3233 | int bdrv_is_sg(BlockDriverState *bs) |
3234 | { | |
3235 | return bs->sg; | |
3236 | } | |
3237 | ||
e900a7b7 CH |
3238 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3239 | { | |
3240 | return bs->enable_write_cache; | |
3241 | } | |
3242 | ||
425b0148 PB |
3243 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3244 | { | |
3245 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3246 | |
3247 | /* so a reopen() will preserve wce */ | |
3248 | if (wce) { | |
3249 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3250 | } else { | |
3251 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3252 | } | |
425b0148 PB |
3253 | } |
3254 | ||
ea2384d3 FB |
3255 | int bdrv_is_encrypted(BlockDriverState *bs) |
3256 | { | |
3257 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3258 | return 1; | |
3259 | return bs->encrypted; | |
3260 | } | |
3261 | ||
c0f4ce77 AL |
3262 | int bdrv_key_required(BlockDriverState *bs) |
3263 | { | |
3264 | BlockDriverState *backing_hd = bs->backing_hd; | |
3265 | ||
3266 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3267 | return 1; | |
3268 | return (bs->encrypted && !bs->valid_key); | |
3269 | } | |
3270 | ||
ea2384d3 FB |
3271 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3272 | { | |
3273 | int ret; | |
3274 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3275 | ret = bdrv_set_key(bs->backing_hd, key); | |
3276 | if (ret < 0) | |
3277 | return ret; | |
3278 | if (!bs->encrypted) | |
3279 | return 0; | |
3280 | } | |
fd04a2ae SH |
3281 | if (!bs->encrypted) { |
3282 | return -EINVAL; | |
3283 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3284 | return -ENOMEDIUM; | |
3285 | } | |
c0f4ce77 | 3286 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3287 | if (ret < 0) { |
3288 | bs->valid_key = 0; | |
3289 | } else if (!bs->valid_key) { | |
3290 | bs->valid_key = 1; | |
3291 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3292 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3293 | } |
c0f4ce77 | 3294 | return ret; |
ea2384d3 FB |
3295 | } |
3296 | ||
f8d6bba1 | 3297 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3298 | { |
f8d6bba1 | 3299 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3300 | } |
3301 | ||
5fafdf24 | 3302 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3303 | void *opaque) |
3304 | { | |
3305 | BlockDriver *drv; | |
3306 | ||
8a22f02a | 3307 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
3308 | it(opaque, drv->format_name); |
3309 | } | |
3310 | } | |
3311 | ||
dc364f4c | 3312 | /* This function is to find block backend bs */ |
b338082b FB |
3313 | BlockDriverState *bdrv_find(const char *name) |
3314 | { | |
3315 | BlockDriverState *bs; | |
3316 | ||
dc364f4c | 3317 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
1b7bdbc1 | 3318 | if (!strcmp(name, bs->device_name)) { |
b338082b | 3319 | return bs; |
1b7bdbc1 | 3320 | } |
b338082b FB |
3321 | } |
3322 | return NULL; | |
3323 | } | |
3324 | ||
dc364f4c BC |
3325 | /* This function is to find a node in the bs graph */ |
3326 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3327 | { | |
3328 | BlockDriverState *bs; | |
3329 | ||
3330 | assert(node_name); | |
3331 | ||
3332 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3333 | if (!strcmp(node_name, bs->node_name)) { | |
3334 | return bs; | |
3335 | } | |
3336 | } | |
3337 | return NULL; | |
3338 | } | |
3339 | ||
c13163fb BC |
3340 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3341 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3342 | { | |
3343 | BlockDeviceInfoList *list, *entry; | |
3344 | BlockDriverState *bs; | |
3345 | ||
3346 | list = NULL; | |
3347 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3348 | entry = g_malloc0(sizeof(*entry)); | |
3349 | entry->value = bdrv_block_device_info(bs); | |
3350 | entry->next = list; | |
3351 | list = entry; | |
3352 | } | |
3353 | ||
3354 | return list; | |
3355 | } | |
3356 | ||
12d3ba82 BC |
3357 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3358 | const char *node_name, | |
3359 | Error **errp) | |
3360 | { | |
3361 | BlockDriverState *bs = NULL; | |
3362 | ||
3363 | if ((!device && !node_name) || (device && node_name)) { | |
3364 | error_setg(errp, "Use either device or node-name but not both"); | |
3365 | return NULL; | |
3366 | } | |
3367 | ||
3368 | if (device) { | |
3369 | bs = bdrv_find(device); | |
3370 | ||
3371 | if (!bs) { | |
3372 | error_set(errp, QERR_DEVICE_NOT_FOUND, device); | |
3373 | return NULL; | |
3374 | } | |
3375 | ||
3376 | return bs; | |
3377 | } | |
3378 | ||
3379 | bs = bdrv_find_node(node_name); | |
3380 | ||
3381 | if (!bs) { | |
3382 | error_set(errp, QERR_DEVICE_NOT_FOUND, node_name); | |
3383 | return NULL; | |
3384 | } | |
3385 | ||
3386 | return bs; | |
3387 | } | |
3388 | ||
2f399b0a MA |
3389 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3390 | { | |
3391 | if (!bs) { | |
3392 | return QTAILQ_FIRST(&bdrv_states); | |
3393 | } | |
dc364f4c | 3394 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3395 | } |
3396 | ||
51de9760 | 3397 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3398 | { |
3399 | BlockDriverState *bs; | |
3400 | ||
dc364f4c | 3401 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
51de9760 | 3402 | it(opaque, bs); |
81d0912d FB |
3403 | } |
3404 | } | |
3405 | ||
ea2384d3 FB |
3406 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3407 | { | |
3408 | return bs->device_name; | |
3409 | } | |
3410 | ||
c8433287 MA |
3411 | int bdrv_get_flags(BlockDriverState *bs) |
3412 | { | |
3413 | return bs->open_flags; | |
3414 | } | |
3415 | ||
f0f0fdfe | 3416 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3417 | { |
3418 | BlockDriverState *bs; | |
f0f0fdfe | 3419 | int result = 0; |
c6ca28d6 | 3420 | |
dc364f4c | 3421 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
f0f0fdfe KW |
3422 | int ret = bdrv_flush(bs); |
3423 | if (ret < 0 && !result) { | |
3424 | result = ret; | |
3425 | } | |
1b7bdbc1 | 3426 | } |
f0f0fdfe KW |
3427 | |
3428 | return result; | |
c6ca28d6 AL |
3429 | } |
3430 | ||
3ac21627 PL |
3431 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3432 | { | |
3433 | return 1; | |
3434 | } | |
3435 | ||
f2feebbd KW |
3436 | int bdrv_has_zero_init(BlockDriverState *bs) |
3437 | { | |
3438 | assert(bs->drv); | |
3439 | ||
11212d8f PB |
3440 | /* If BS is a copy on write image, it is initialized to |
3441 | the contents of the base image, which may not be zeroes. */ | |
3442 | if (bs->backing_hd) { | |
3443 | return 0; | |
3444 | } | |
336c1c12 KW |
3445 | if (bs->drv->bdrv_has_zero_init) { |
3446 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3447 | } |
3448 | ||
3ac21627 PL |
3449 | /* safe default */ |
3450 | return 0; | |
f2feebbd KW |
3451 | } |
3452 | ||
4ce78691 PL |
3453 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3454 | { | |
3455 | BlockDriverInfo bdi; | |
3456 | ||
3457 | if (bs->backing_hd) { | |
3458 | return false; | |
3459 | } | |
3460 | ||
3461 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3462 | return bdi.unallocated_blocks_are_zero; | |
3463 | } | |
3464 | ||
3465 | return false; | |
3466 | } | |
3467 | ||
3468 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3469 | { | |
3470 | BlockDriverInfo bdi; | |
3471 | ||
3472 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3473 | return false; | |
3474 | } | |
3475 | ||
3476 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3477 | return bdi.can_write_zeroes_with_unmap; | |
3478 | } | |
3479 | ||
3480 | return false; | |
3481 | } | |
3482 | ||
b6b8a333 | 3483 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3484 | BlockDriverState *bs; |
b35b2bba | 3485 | BlockDriverState *base; |
376ae3f1 SH |
3486 | int64_t sector_num; |
3487 | int nb_sectors; | |
3488 | int *pnum; | |
b6b8a333 | 3489 | int64_t ret; |
376ae3f1 | 3490 | bool done; |
b6b8a333 | 3491 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3492 | |
f58c7b35 TS |
3493 | /* |
3494 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3495 | * not implementing the functionality are assumed to not support backing files, | |
3496 | * hence all their sectors are reported as allocated. | |
3497 | * | |
bd9533e3 SH |
3498 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3499 | * and 'pnum' is set to 0. | |
3500 | * | |
f58c7b35 TS |
3501 | * 'pnum' is set to the number of sectors (including and immediately following |
3502 | * the specified sector) that are known to be in the same | |
3503 | * allocated/unallocated state. | |
3504 | * | |
bd9533e3 SH |
3505 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3506 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3507 | */ |
b6b8a333 PB |
3508 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3509 | int64_t sector_num, | |
3510 | int nb_sectors, int *pnum) | |
f58c7b35 | 3511 | { |
617ccb46 | 3512 | int64_t length; |
bd9533e3 | 3513 | int64_t n; |
5daa74a6 | 3514 | int64_t ret, ret2; |
bd9533e3 | 3515 | |
617ccb46 PB |
3516 | length = bdrv_getlength(bs); |
3517 | if (length < 0) { | |
3518 | return length; | |
3519 | } | |
3520 | ||
3521 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3522 | *pnum = 0; |
3523 | return 0; | |
3524 | } | |
3525 | ||
3526 | n = bs->total_sectors - sector_num; | |
3527 | if (n < nb_sectors) { | |
3528 | nb_sectors = n; | |
3529 | } | |
3530 | ||
b6b8a333 | 3531 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3532 | *pnum = nb_sectors; |
918e92d7 PB |
3533 | ret = BDRV_BLOCK_DATA; |
3534 | if (bs->drv->protocol_name) { | |
3535 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3536 | } | |
3537 | return ret; | |
f58c7b35 | 3538 | } |
6aebab14 | 3539 | |
415b5b01 PB |
3540 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3541 | if (ret < 0) { | |
3e0a233d | 3542 | *pnum = 0; |
415b5b01 PB |
3543 | return ret; |
3544 | } | |
3545 | ||
92bc50a5 PL |
3546 | if (ret & BDRV_BLOCK_RAW) { |
3547 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
3548 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3549 | *pnum, pnum); | |
3550 | } | |
3551 | ||
c3d86884 PL |
3552 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
3553 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 3554 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 3555 | } else if (bs->backing_hd) { |
f0ad5712 PB |
3556 | BlockDriverState *bs2 = bs->backing_hd; |
3557 | int64_t length2 = bdrv_getlength(bs2); | |
3558 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3559 | ret |= BDRV_BLOCK_ZERO; | |
3560 | } | |
3561 | } | |
415b5b01 | 3562 | } |
5daa74a6 PB |
3563 | |
3564 | if (bs->file && | |
3565 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3566 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3567 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3568 | *pnum, pnum); | |
3569 | if (ret2 >= 0) { | |
3570 | /* Ignore errors. This is just providing extra information, it | |
3571 | * is useful but not necessary. | |
3572 | */ | |
3573 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3574 | } | |
3575 | } | |
3576 | ||
415b5b01 | 3577 | return ret; |
060f51c9 SH |
3578 | } |
3579 | ||
b6b8a333 PB |
3580 | /* Coroutine wrapper for bdrv_get_block_status() */ |
3581 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 3582 | { |
b6b8a333 | 3583 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
3584 | BlockDriverState *bs = data->bs; |
3585 | ||
b6b8a333 PB |
3586 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
3587 | data->pnum); | |
060f51c9 SH |
3588 | data->done = true; |
3589 | } | |
3590 | ||
3591 | /* | |
b6b8a333 | 3592 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 3593 | * |
b6b8a333 | 3594 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 3595 | */ |
b6b8a333 PB |
3596 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
3597 | int nb_sectors, int *pnum) | |
060f51c9 | 3598 | { |
6aebab14 | 3599 | Coroutine *co; |
b6b8a333 | 3600 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
3601 | .bs = bs, |
3602 | .sector_num = sector_num, | |
3603 | .nb_sectors = nb_sectors, | |
3604 | .pnum = pnum, | |
3605 | .done = false, | |
3606 | }; | |
3607 | ||
bdad13b9 PB |
3608 | if (qemu_in_coroutine()) { |
3609 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 3610 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 3611 | } else { |
b6b8a333 | 3612 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
3613 | qemu_coroutine_enter(co, &data); |
3614 | while (!data.done) { | |
3615 | qemu_aio_wait(); | |
3616 | } | |
6aebab14 SH |
3617 | } |
3618 | return data.ret; | |
f58c7b35 TS |
3619 | } |
3620 | ||
b6b8a333 PB |
3621 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
3622 | int nb_sectors, int *pnum) | |
3623 | { | |
4333bb71 PB |
3624 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
3625 | if (ret < 0) { | |
3626 | return ret; | |
3627 | } | |
3628 | return | |
3629 | (ret & BDRV_BLOCK_DATA) || | |
3630 | ((ret & BDRV_BLOCK_ZERO) && !bdrv_has_zero_init(bs)); | |
b6b8a333 PB |
3631 | } |
3632 | ||
188a7bbf PB |
3633 | /* |
3634 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3635 | * | |
3636 | * Return true if the given sector is allocated in any image between | |
3637 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3638 | * sector is allocated in any image of the chain. Return false otherwise. | |
3639 | * | |
3640 | * 'pnum' is set to the number of sectors (including and immediately following | |
3641 | * the specified sector) that are known to be in the same | |
3642 | * allocated/unallocated state. | |
3643 | * | |
3644 | */ | |
4f578637 PB |
3645 | int bdrv_is_allocated_above(BlockDriverState *top, |
3646 | BlockDriverState *base, | |
3647 | int64_t sector_num, | |
3648 | int nb_sectors, int *pnum) | |
188a7bbf PB |
3649 | { |
3650 | BlockDriverState *intermediate; | |
3651 | int ret, n = nb_sectors; | |
3652 | ||
3653 | intermediate = top; | |
3654 | while (intermediate && intermediate != base) { | |
3655 | int pnum_inter; | |
bdad13b9 PB |
3656 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
3657 | &pnum_inter); | |
188a7bbf PB |
3658 | if (ret < 0) { |
3659 | return ret; | |
3660 | } else if (ret) { | |
3661 | *pnum = pnum_inter; | |
3662 | return 1; | |
3663 | } | |
3664 | ||
3665 | /* | |
3666 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3667 | * might have | |
3668 | * | |
3669 | * [sector_num+x, nr_sectors] allocated. | |
3670 | */ | |
63ba17d3 VI |
3671 | if (n > pnum_inter && |
3672 | (intermediate == top || | |
3673 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3674 | n = pnum_inter; |
3675 | } | |
3676 | ||
3677 | intermediate = intermediate->backing_hd; | |
3678 | } | |
3679 | ||
3680 | *pnum = n; | |
3681 | return 0; | |
3682 | } | |
3683 | ||
045df330 AL |
3684 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3685 | { | |
3686 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3687 | return bs->backing_file; | |
3688 | else if (bs->encrypted) | |
3689 | return bs->filename; | |
3690 | else | |
3691 | return NULL; | |
3692 | } | |
3693 | ||
5fafdf24 | 3694 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3695 | char *filename, int filename_size) |
3696 | { | |
3574c608 | 3697 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3698 | } |
3699 | ||
5fafdf24 | 3700 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3701 | const uint8_t *buf, int nb_sectors) |
3702 | { | |
3703 | BlockDriver *drv = bs->drv; | |
3704 | if (!drv) | |
19cb3738 | 3705 | return -ENOMEDIUM; |
faea38e7 FB |
3706 | if (!drv->bdrv_write_compressed) |
3707 | return -ENOTSUP; | |
fbb7b4e0 KW |
3708 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3709 | return -EIO; | |
a55eb92c | 3710 | |
e4654d2d | 3711 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 3712 | |
faea38e7 FB |
3713 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3714 | } | |
3b46e624 | 3715 | |
faea38e7 FB |
3716 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3717 | { | |
3718 | BlockDriver *drv = bs->drv; | |
3719 | if (!drv) | |
19cb3738 | 3720 | return -ENOMEDIUM; |
faea38e7 FB |
3721 | if (!drv->bdrv_get_info) |
3722 | return -ENOTSUP; | |
3723 | memset(bdi, 0, sizeof(*bdi)); | |
3724 | return drv->bdrv_get_info(bs, bdi); | |
3725 | } | |
3726 | ||
eae041fe HR |
3727 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
3728 | { | |
3729 | BlockDriver *drv = bs->drv; | |
3730 | if (drv && drv->bdrv_get_specific_info) { | |
3731 | return drv->bdrv_get_specific_info(bs); | |
3732 | } | |
3733 | return NULL; | |
3734 | } | |
3735 | ||
45566e9c CH |
3736 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3737 | int64_t pos, int size) | |
cf8074b3 KW |
3738 | { |
3739 | QEMUIOVector qiov; | |
3740 | struct iovec iov = { | |
3741 | .iov_base = (void *) buf, | |
3742 | .iov_len = size, | |
3743 | }; | |
3744 | ||
3745 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3746 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3747 | } | |
3748 | ||
3749 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
3750 | { |
3751 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
3752 | |
3753 | if (!drv) { | |
178e08a5 | 3754 | return -ENOMEDIUM; |
cf8074b3 KW |
3755 | } else if (drv->bdrv_save_vmstate) { |
3756 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
3757 | } else if (bs->file) { | |
3758 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
3759 | } | |
3760 | ||
7cdb1f6d | 3761 | return -ENOTSUP; |
178e08a5 AL |
3762 | } |
3763 | ||
45566e9c CH |
3764 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3765 | int64_t pos, int size) | |
178e08a5 AL |
3766 | { |
3767 | BlockDriver *drv = bs->drv; | |
3768 | if (!drv) | |
3769 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3770 | if (drv->bdrv_load_vmstate) |
3771 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3772 | if (bs->file) | |
3773 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3774 | return -ENOTSUP; | |
178e08a5 AL |
3775 | } |
3776 | ||
8b9b0cc2 KW |
3777 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3778 | { | |
bf736fe3 | 3779 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
3780 | return; |
3781 | } | |
3782 | ||
bf736fe3 | 3783 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3784 | } |
3785 | ||
3786 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3787 | const char *tag) | |
3788 | { | |
3789 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3790 | bs = bs->file; | |
3791 | } | |
3792 | ||
3793 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3794 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3795 | } | |
3796 | ||
3797 | return -ENOTSUP; | |
3798 | } | |
3799 | ||
4cc70e93 FZ |
3800 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
3801 | { | |
3802 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
3803 | bs = bs->file; | |
3804 | } | |
3805 | ||
3806 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
3807 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
3808 | } | |
3809 | ||
3810 | return -ENOTSUP; | |
3811 | } | |
3812 | ||
41c695c7 KW |
3813 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
3814 | { | |
3815 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3816 | bs = bs->file; | |
3817 | } | |
8b9b0cc2 | 3818 | |
41c695c7 KW |
3819 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3820 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3821 | } | |
3822 | ||
3823 | return -ENOTSUP; | |
3824 | } | |
3825 | ||
3826 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3827 | { | |
3828 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3829 | bs = bs->file; | |
3830 | } | |
3831 | ||
3832 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3833 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3834 | } | |
3835 | ||
3836 | return false; | |
8b9b0cc2 KW |
3837 | } |
3838 | ||
199630b6 BS |
3839 | int bdrv_is_snapshot(BlockDriverState *bs) |
3840 | { | |
3841 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3842 | } | |
3843 | ||
b1b1d783 JC |
3844 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3845 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3846 | * from a BDS as backing_file should not be done, as that may be relative to | |
3847 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3848 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3849 | const char *backing_file) | |
3850 | { | |
b1b1d783 JC |
3851 | char *filename_full = NULL; |
3852 | char *backing_file_full = NULL; | |
3853 | char *filename_tmp = NULL; | |
3854 | int is_protocol = 0; | |
3855 | BlockDriverState *curr_bs = NULL; | |
3856 | BlockDriverState *retval = NULL; | |
3857 | ||
3858 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3859 | return NULL; |
3860 | } | |
3861 | ||
b1b1d783 JC |
3862 | filename_full = g_malloc(PATH_MAX); |
3863 | backing_file_full = g_malloc(PATH_MAX); | |
3864 | filename_tmp = g_malloc(PATH_MAX); | |
3865 | ||
3866 | is_protocol = path_has_protocol(backing_file); | |
3867 | ||
3868 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3869 | ||
3870 | /* If either of the filename paths is actually a protocol, then | |
3871 | * compare unmodified paths; otherwise make paths relative */ | |
3872 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3873 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3874 | retval = curr_bs->backing_hd; | |
3875 | break; | |
3876 | } | |
e8a6bb9c | 3877 | } else { |
b1b1d783 JC |
3878 | /* If not an absolute filename path, make it relative to the current |
3879 | * image's filename path */ | |
3880 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3881 | backing_file); | |
3882 | ||
3883 | /* We are going to compare absolute pathnames */ | |
3884 | if (!realpath(filename_tmp, filename_full)) { | |
3885 | continue; | |
3886 | } | |
3887 | ||
3888 | /* We need to make sure the backing filename we are comparing against | |
3889 | * is relative to the current image filename (or absolute) */ | |
3890 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3891 | curr_bs->backing_file); | |
3892 | ||
3893 | if (!realpath(filename_tmp, backing_file_full)) { | |
3894 | continue; | |
3895 | } | |
3896 | ||
3897 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3898 | retval = curr_bs->backing_hd; | |
3899 | break; | |
3900 | } | |
e8a6bb9c MT |
3901 | } |
3902 | } | |
3903 | ||
b1b1d783 JC |
3904 | g_free(filename_full); |
3905 | g_free(backing_file_full); | |
3906 | g_free(filename_tmp); | |
3907 | return retval; | |
e8a6bb9c MT |
3908 | } |
3909 | ||
f198fd1c BC |
3910 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3911 | { | |
3912 | if (!bs->drv) { | |
3913 | return 0; | |
3914 | } | |
3915 | ||
3916 | if (!bs->backing_hd) { | |
3917 | return 0; | |
3918 | } | |
3919 | ||
3920 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3921 | } | |
3922 | ||
79fac568 JC |
3923 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3924 | { | |
3925 | BlockDriverState *curr_bs = NULL; | |
3926 | ||
3927 | if (!bs) { | |
3928 | return NULL; | |
3929 | } | |
3930 | ||
3931 | curr_bs = bs; | |
3932 | ||
3933 | while (curr_bs->backing_hd) { | |
3934 | curr_bs = curr_bs->backing_hd; | |
3935 | } | |
3936 | return curr_bs; | |
3937 | } | |
3938 | ||
ea2384d3 | 3939 | /**************************************************************/ |
83f64091 | 3940 | /* async I/Os */ |
ea2384d3 | 3941 | |
3b69e4b9 | 3942 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3943 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3944 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3945 | { |
bbf0a440 SH |
3946 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3947 | ||
d20d9b7c | 3948 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 3949 | cb, opaque, false); |
ea2384d3 FB |
3950 | } |
3951 | ||
f141eafe AL |
3952 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3953 | QEMUIOVector *qiov, int nb_sectors, | |
3954 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3955 | { |
bbf0a440 SH |
3956 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3957 | ||
d20d9b7c | 3958 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 3959 | cb, opaque, true); |
83f64091 FB |
3960 | } |
3961 | ||
d5ef94d4 PB |
3962 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
3963 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
3964 | BlockDriverCompletionFunc *cb, void *opaque) | |
3965 | { | |
3966 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
3967 | ||
3968 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
3969 | BDRV_REQ_ZERO_WRITE | flags, | |
3970 | cb, opaque, true); | |
3971 | } | |
3972 | ||
40b4f539 KW |
3973 | |
3974 | typedef struct MultiwriteCB { | |
3975 | int error; | |
3976 | int num_requests; | |
3977 | int num_callbacks; | |
3978 | struct { | |
3979 | BlockDriverCompletionFunc *cb; | |
3980 | void *opaque; | |
3981 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3982 | } callbacks[]; |
3983 | } MultiwriteCB; | |
3984 | ||
3985 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3986 | { | |
3987 | int i; | |
3988 | ||
3989 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3990 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3991 | if (mcb->callbacks[i].free_qiov) { |
3992 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3993 | } | |
7267c094 | 3994 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3995 | } |
3996 | } | |
3997 | ||
3998 | static void multiwrite_cb(void *opaque, int ret) | |
3999 | { | |
4000 | MultiwriteCB *mcb = opaque; | |
4001 | ||
6d519a5f SH |
4002 | trace_multiwrite_cb(mcb, ret); |
4003 | ||
cb6d3ca0 | 4004 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4005 | mcb->error = ret; |
40b4f539 KW |
4006 | } |
4007 | ||
4008 | mcb->num_requests--; | |
4009 | if (mcb->num_requests == 0) { | |
de189a1b | 4010 | multiwrite_user_cb(mcb); |
7267c094 | 4011 | g_free(mcb); |
40b4f539 KW |
4012 | } |
4013 | } | |
4014 | ||
4015 | static int multiwrite_req_compare(const void *a, const void *b) | |
4016 | { | |
77be4366 CH |
4017 | const BlockRequest *req1 = a, *req2 = b; |
4018 | ||
4019 | /* | |
4020 | * Note that we can't simply subtract req2->sector from req1->sector | |
4021 | * here as that could overflow the return value. | |
4022 | */ | |
4023 | if (req1->sector > req2->sector) { | |
4024 | return 1; | |
4025 | } else if (req1->sector < req2->sector) { | |
4026 | return -1; | |
4027 | } else { | |
4028 | return 0; | |
4029 | } | |
40b4f539 KW |
4030 | } |
4031 | ||
4032 | /* | |
4033 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4034 | * requests that remain after merging. | |
4035 | */ | |
4036 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4037 | int num_reqs, MultiwriteCB *mcb) | |
4038 | { | |
4039 | int i, outidx; | |
4040 | ||
4041 | // Sort requests by start sector | |
4042 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4043 | ||
4044 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4045 | // filling up gaps with zero sectors. | |
4046 | outidx = 0; | |
4047 | for (i = 1; i < num_reqs; i++) { | |
4048 | int merge = 0; | |
4049 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4050 | ||
b6a127a1 | 4051 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4052 | if (reqs[i].sector <= oldreq_last) { |
4053 | merge = 1; | |
4054 | } | |
4055 | ||
e2a305fb CH |
4056 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4057 | merge = 0; | |
4058 | } | |
4059 | ||
40b4f539 KW |
4060 | if (merge) { |
4061 | size_t size; | |
7267c094 | 4062 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4063 | qemu_iovec_init(qiov, |
4064 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4065 | ||
4066 | // Add the first request to the merged one. If the requests are | |
4067 | // overlapping, drop the last sectors of the first request. | |
4068 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4069 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4070 | |
b6a127a1 PB |
4071 | // We should need to add any zeros between the two requests |
4072 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4073 | |
4074 | // Add the second request | |
1b093c48 | 4075 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4076 | |
cbf1dff2 | 4077 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4078 | reqs[outidx].qiov = qiov; |
4079 | ||
4080 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4081 | } else { | |
4082 | outidx++; | |
4083 | reqs[outidx].sector = reqs[i].sector; | |
4084 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4085 | reqs[outidx].qiov = reqs[i].qiov; | |
4086 | } | |
4087 | } | |
4088 | ||
4089 | return outidx + 1; | |
4090 | } | |
4091 | ||
4092 | /* | |
4093 | * Submit multiple AIO write requests at once. | |
4094 | * | |
4095 | * On success, the function returns 0 and all requests in the reqs array have | |
4096 | * been submitted. In error case this function returns -1, and any of the | |
4097 | * requests may or may not be submitted yet. In particular, this means that the | |
4098 | * callback will be called for some of the requests, for others it won't. The | |
4099 | * caller must check the error field of the BlockRequest to wait for the right | |
4100 | * callbacks (if error != 0, no callback will be called). | |
4101 | * | |
4102 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4103 | * requests. However, the fields opaque and error are left unmodified as they | |
4104 | * are used to signal failure for a single request to the caller. | |
4105 | */ | |
4106 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4107 | { | |
40b4f539 KW |
4108 | MultiwriteCB *mcb; |
4109 | int i; | |
4110 | ||
301db7c2 RH |
4111 | /* don't submit writes if we don't have a medium */ |
4112 | if (bs->drv == NULL) { | |
4113 | for (i = 0; i < num_reqs; i++) { | |
4114 | reqs[i].error = -ENOMEDIUM; | |
4115 | } | |
4116 | return -1; | |
4117 | } | |
4118 | ||
40b4f539 KW |
4119 | if (num_reqs == 0) { |
4120 | return 0; | |
4121 | } | |
4122 | ||
4123 | // Create MultiwriteCB structure | |
7267c094 | 4124 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4125 | mcb->num_requests = 0; |
4126 | mcb->num_callbacks = num_reqs; | |
4127 | ||
4128 | for (i = 0; i < num_reqs; i++) { | |
4129 | mcb->callbacks[i].cb = reqs[i].cb; | |
4130 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4131 | } | |
4132 | ||
4133 | // Check for mergable requests | |
4134 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4135 | ||
6d519a5f SH |
4136 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4137 | ||
df9309fb PB |
4138 | /* Run the aio requests. */ |
4139 | mcb->num_requests = num_reqs; | |
40b4f539 | 4140 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4141 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4142 | reqs[i].nb_sectors, reqs[i].flags, | |
4143 | multiwrite_cb, mcb, | |
4144 | true); | |
40b4f539 KW |
4145 | } |
4146 | ||
4147 | return 0; | |
40b4f539 KW |
4148 | } |
4149 | ||
83f64091 | 4150 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 4151 | { |
d7331bed | 4152 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
4153 | } |
4154 | ||
4155 | /**************************************************************/ | |
4156 | /* async block device emulation */ | |
4157 | ||
c16b5a2c CH |
4158 | typedef struct BlockDriverAIOCBSync { |
4159 | BlockDriverAIOCB common; | |
4160 | QEMUBH *bh; | |
4161 | int ret; | |
4162 | /* vector translation state */ | |
4163 | QEMUIOVector *qiov; | |
4164 | uint8_t *bounce; | |
4165 | int is_write; | |
4166 | } BlockDriverAIOCBSync; | |
4167 | ||
4168 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
4169 | { | |
b666d239 KW |
4170 | BlockDriverAIOCBSync *acb = |
4171 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 4172 | qemu_bh_delete(acb->bh); |
36afc451 | 4173 | acb->bh = NULL; |
c16b5a2c CH |
4174 | qemu_aio_release(acb); |
4175 | } | |
4176 | ||
d7331bed | 4177 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
4178 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
4179 | .cancel = bdrv_aio_cancel_em, | |
4180 | }; | |
4181 | ||
ce1a14dc | 4182 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4183 | { |
ce1a14dc | 4184 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4185 | |
f141eafe | 4186 | if (!acb->is_write) |
03396148 | 4187 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 4188 | qemu_vfree(acb->bounce); |
ce1a14dc | 4189 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4190 | qemu_bh_delete(acb->bh); |
36afc451 | 4191 | acb->bh = NULL; |
ce1a14dc | 4192 | qemu_aio_release(acb); |
83f64091 | 4193 | } |
beac80cd | 4194 | |
f141eafe AL |
4195 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4196 | int64_t sector_num, | |
4197 | QEMUIOVector *qiov, | |
4198 | int nb_sectors, | |
4199 | BlockDriverCompletionFunc *cb, | |
4200 | void *opaque, | |
4201 | int is_write) | |
4202 | ||
83f64091 | 4203 | { |
ce1a14dc | 4204 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4205 | |
d7331bed | 4206 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4207 | acb->is_write = is_write; |
4208 | acb->qiov = qiov; | |
e268ca52 | 4209 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 4210 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
4211 | |
4212 | if (is_write) { | |
d5e6b161 | 4213 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4214 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4215 | } else { |
1ed20acf | 4216 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4217 | } |
4218 | ||
ce1a14dc | 4219 | qemu_bh_schedule(acb->bh); |
f141eafe | 4220 | |
ce1a14dc | 4221 | return &acb->common; |
beac80cd FB |
4222 | } |
4223 | ||
f141eafe AL |
4224 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4225 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4226 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4227 | { |
f141eafe AL |
4228 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4229 | } | |
83f64091 | 4230 | |
f141eafe AL |
4231 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4232 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4233 | BlockDriverCompletionFunc *cb, void *opaque) | |
4234 | { | |
4235 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4236 | } |
beac80cd | 4237 | |
68485420 KW |
4238 | |
4239 | typedef struct BlockDriverAIOCBCoroutine { | |
4240 | BlockDriverAIOCB common; | |
4241 | BlockRequest req; | |
4242 | bool is_write; | |
d318aea9 | 4243 | bool *done; |
68485420 KW |
4244 | QEMUBH* bh; |
4245 | } BlockDriverAIOCBCoroutine; | |
4246 | ||
4247 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
4248 | { | |
d318aea9 KW |
4249 | BlockDriverAIOCBCoroutine *acb = |
4250 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
4251 | bool done = false; | |
4252 | ||
4253 | acb->done = &done; | |
4254 | while (!done) { | |
4255 | qemu_aio_wait(); | |
4256 | } | |
68485420 KW |
4257 | } |
4258 | ||
d7331bed | 4259 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
4260 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
4261 | .cancel = bdrv_aio_co_cancel_em, | |
4262 | }; | |
4263 | ||
35246a68 | 4264 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4265 | { |
4266 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4267 | ||
4268 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
4269 | |
4270 | if (acb->done) { | |
4271 | *acb->done = true; | |
4272 | } | |
4273 | ||
68485420 KW |
4274 | qemu_bh_delete(acb->bh); |
4275 | qemu_aio_release(acb); | |
4276 | } | |
4277 | ||
b2a61371 SH |
4278 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4279 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4280 | { | |
4281 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4282 | BlockDriverState *bs = acb->common.bs; | |
4283 | ||
4284 | if (!acb->is_write) { | |
4285 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4286 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4287 | } else { |
4288 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4289 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4290 | } |
4291 | ||
35246a68 | 4292 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
4293 | qemu_bh_schedule(acb->bh); |
4294 | } | |
4295 | ||
68485420 KW |
4296 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4297 | int64_t sector_num, | |
4298 | QEMUIOVector *qiov, | |
4299 | int nb_sectors, | |
d20d9b7c | 4300 | BdrvRequestFlags flags, |
68485420 KW |
4301 | BlockDriverCompletionFunc *cb, |
4302 | void *opaque, | |
8c5873d6 | 4303 | bool is_write) |
68485420 KW |
4304 | { |
4305 | Coroutine *co; | |
4306 | BlockDriverAIOCBCoroutine *acb; | |
4307 | ||
d7331bed | 4308 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4309 | acb->req.sector = sector_num; |
4310 | acb->req.nb_sectors = nb_sectors; | |
4311 | acb->req.qiov = qiov; | |
d20d9b7c | 4312 | acb->req.flags = flags; |
68485420 | 4313 | acb->is_write = is_write; |
d318aea9 | 4314 | acb->done = NULL; |
68485420 | 4315 | |
8c5873d6 | 4316 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4317 | qemu_coroutine_enter(co, acb); |
4318 | ||
4319 | return &acb->common; | |
4320 | } | |
4321 | ||
07f07615 | 4322 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4323 | { |
07f07615 PB |
4324 | BlockDriverAIOCBCoroutine *acb = opaque; |
4325 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4326 | |
07f07615 PB |
4327 | acb->req.error = bdrv_co_flush(bs); |
4328 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 4329 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4330 | } |
4331 | ||
07f07615 | 4332 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4333 | BlockDriverCompletionFunc *cb, void *opaque) |
4334 | { | |
07f07615 | 4335 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4336 | |
07f07615 PB |
4337 | Coroutine *co; |
4338 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4339 | |
d7331bed | 4340 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
4341 | acb->done = NULL; |
4342 | ||
07f07615 PB |
4343 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4344 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4345 | |
016f5cf6 AG |
4346 | return &acb->common; |
4347 | } | |
4348 | ||
4265d620 PB |
4349 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4350 | { | |
4351 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4352 | BlockDriverState *bs = acb->common.bs; | |
4353 | ||
4354 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
4355 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
4356 | qemu_bh_schedule(acb->bh); | |
4357 | } | |
4358 | ||
4359 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4360 | int64_t sector_num, int nb_sectors, | |
4361 | BlockDriverCompletionFunc *cb, void *opaque) | |
4362 | { | |
4363 | Coroutine *co; | |
4364 | BlockDriverAIOCBCoroutine *acb; | |
4365 | ||
4366 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4367 | ||
d7331bed | 4368 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4369 | acb->req.sector = sector_num; |
4370 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4371 | acb->done = NULL; |
4265d620 PB |
4372 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4373 | qemu_coroutine_enter(co, acb); | |
4374 | ||
4375 | return &acb->common; | |
4376 | } | |
4377 | ||
ea2384d3 FB |
4378 | void bdrv_init(void) |
4379 | { | |
5efa9d5a | 4380 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4381 | } |
ce1a14dc | 4382 | |
eb852011 MA |
4383 | void bdrv_init_with_whitelist(void) |
4384 | { | |
4385 | use_bdrv_whitelist = 1; | |
4386 | bdrv_init(); | |
4387 | } | |
4388 | ||
d7331bed | 4389 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4390 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4391 | { |
ce1a14dc PB |
4392 | BlockDriverAIOCB *acb; |
4393 | ||
d7331bed SH |
4394 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4395 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4396 | acb->bs = bs; |
4397 | acb->cb = cb; | |
4398 | acb->opaque = opaque; | |
4399 | return acb; | |
4400 | } | |
4401 | ||
4402 | void qemu_aio_release(void *p) | |
4403 | { | |
d37c975f | 4404 | BlockDriverAIOCB *acb = p; |
d7331bed | 4405 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4406 | } |
19cb3738 | 4407 | |
f9f05dc5 KW |
4408 | /**************************************************************/ |
4409 | /* Coroutine block device emulation */ | |
4410 | ||
4411 | typedef struct CoroutineIOCompletion { | |
4412 | Coroutine *coroutine; | |
4413 | int ret; | |
4414 | } CoroutineIOCompletion; | |
4415 | ||
4416 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4417 | { | |
4418 | CoroutineIOCompletion *co = opaque; | |
4419 | ||
4420 | co->ret = ret; | |
4421 | qemu_coroutine_enter(co->coroutine, NULL); | |
4422 | } | |
4423 | ||
4424 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4425 | int nb_sectors, QEMUIOVector *iov, | |
4426 | bool is_write) | |
4427 | { | |
4428 | CoroutineIOCompletion co = { | |
4429 | .coroutine = qemu_coroutine_self(), | |
4430 | }; | |
4431 | BlockDriverAIOCB *acb; | |
4432 | ||
4433 | if (is_write) { | |
a652d160 SH |
4434 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4435 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4436 | } else { |
a652d160 SH |
4437 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4438 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4439 | } |
4440 | ||
59370aaa | 4441 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4442 | if (!acb) { |
4443 | return -EIO; | |
4444 | } | |
4445 | qemu_coroutine_yield(); | |
4446 | ||
4447 | return co.ret; | |
4448 | } | |
4449 | ||
4450 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4451 | int64_t sector_num, int nb_sectors, | |
4452 | QEMUIOVector *iov) | |
4453 | { | |
4454 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4455 | } | |
4456 | ||
4457 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4458 | int64_t sector_num, int nb_sectors, | |
4459 | QEMUIOVector *iov) | |
4460 | { | |
4461 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4462 | } | |
4463 | ||
07f07615 | 4464 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4465 | { |
07f07615 PB |
4466 | RwCo *rwco = opaque; |
4467 | ||
4468 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4469 | } | |
4470 | ||
4471 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4472 | { | |
eb489bb1 KW |
4473 | int ret; |
4474 | ||
29cdb251 | 4475 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4476 | return 0; |
eb489bb1 KW |
4477 | } |
4478 | ||
ca716364 | 4479 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4480 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4481 | if (bs->drv->bdrv_co_flush_to_os) { |
4482 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4483 | if (ret < 0) { | |
4484 | return ret; | |
4485 | } | |
4486 | } | |
4487 | ||
ca716364 KW |
4488 | /* But don't actually force it to the disk with cache=unsafe */ |
4489 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4490 | goto flush_parent; |
ca716364 KW |
4491 | } |
4492 | ||
bf736fe3 | 4493 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4494 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4495 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4496 | } else if (bs->drv->bdrv_aio_flush) { |
4497 | BlockDriverAIOCB *acb; | |
4498 | CoroutineIOCompletion co = { | |
4499 | .coroutine = qemu_coroutine_self(), | |
4500 | }; | |
4501 | ||
4502 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4503 | if (acb == NULL) { | |
29cdb251 | 4504 | ret = -EIO; |
07f07615 PB |
4505 | } else { |
4506 | qemu_coroutine_yield(); | |
29cdb251 | 4507 | ret = co.ret; |
07f07615 | 4508 | } |
07f07615 PB |
4509 | } else { |
4510 | /* | |
4511 | * Some block drivers always operate in either writethrough or unsafe | |
4512 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4513 | * know how the server works (because the behaviour is hardcoded or | |
4514 | * depends on server-side configuration), so we can't ensure that | |
4515 | * everything is safe on disk. Returning an error doesn't work because | |
4516 | * that would break guests even if the server operates in writethrough | |
4517 | * mode. | |
4518 | * | |
4519 | * Let's hope the user knows what he's doing. | |
4520 | */ | |
29cdb251 | 4521 | ret = 0; |
07f07615 | 4522 | } |
29cdb251 PB |
4523 | if (ret < 0) { |
4524 | return ret; | |
4525 | } | |
4526 | ||
4527 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4528 | * in the case of cache=unsafe, so there are no useless flushes. | |
4529 | */ | |
d4c82329 | 4530 | flush_parent: |
29cdb251 | 4531 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4532 | } |
4533 | ||
0f15423c AL |
4534 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4535 | { | |
4536 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4537 | bs->drv->bdrv_invalidate_cache(bs); | |
4538 | } | |
4539 | } | |
4540 | ||
4541 | void bdrv_invalidate_cache_all(void) | |
4542 | { | |
4543 | BlockDriverState *bs; | |
4544 | ||
dc364f4c | 4545 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
0f15423c AL |
4546 | bdrv_invalidate_cache(bs); |
4547 | } | |
4548 | } | |
4549 | ||
07789269 BC |
4550 | void bdrv_clear_incoming_migration_all(void) |
4551 | { | |
4552 | BlockDriverState *bs; | |
4553 | ||
dc364f4c | 4554 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
07789269 BC |
4555 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
4556 | } | |
4557 | } | |
4558 | ||
07f07615 PB |
4559 | int bdrv_flush(BlockDriverState *bs) |
4560 | { | |
4561 | Coroutine *co; | |
4562 | RwCo rwco = { | |
4563 | .bs = bs, | |
4564 | .ret = NOT_DONE, | |
e7a8a783 | 4565 | }; |
e7a8a783 | 4566 | |
07f07615 PB |
4567 | if (qemu_in_coroutine()) { |
4568 | /* Fast-path if already in coroutine context */ | |
4569 | bdrv_flush_co_entry(&rwco); | |
4570 | } else { | |
4571 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4572 | qemu_coroutine_enter(co, &rwco); | |
4573 | while (rwco.ret == NOT_DONE) { | |
4574 | qemu_aio_wait(); | |
4575 | } | |
e7a8a783 | 4576 | } |
07f07615 PB |
4577 | |
4578 | return rwco.ret; | |
e7a8a783 KW |
4579 | } |
4580 | ||
4265d620 PB |
4581 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4582 | { | |
4583 | RwCo *rwco = opaque; | |
4584 | ||
4585 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4586 | } | |
4587 | ||
6f14da52 PL |
4588 | /* if no limit is specified in the BlockLimits use a default |
4589 | * of 32768 512-byte sectors (16 MiB) per request. | |
4590 | */ | |
4591 | #define MAX_DISCARD_DEFAULT 32768 | |
4592 | ||
4265d620 PB |
4593 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
4594 | int nb_sectors) | |
4595 | { | |
d51e9fe5 PB |
4596 | int max_discard; |
4597 | ||
4265d620 PB |
4598 | if (!bs->drv) { |
4599 | return -ENOMEDIUM; | |
4600 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4601 | return -EIO; | |
4602 | } else if (bs->read_only) { | |
4603 | return -EROFS; | |
df702c9b PB |
4604 | } |
4605 | ||
e4654d2d | 4606 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 4607 | |
9e8f1835 PB |
4608 | /* Do nothing if disabled. */ |
4609 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4610 | return 0; | |
4611 | } | |
4612 | ||
d51e9fe5 PB |
4613 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
4614 | return 0; | |
4615 | } | |
6f14da52 | 4616 | |
d51e9fe5 PB |
4617 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
4618 | while (nb_sectors > 0) { | |
4619 | int ret; | |
4620 | int num = nb_sectors; | |
6f14da52 | 4621 | |
d51e9fe5 PB |
4622 | /* align request */ |
4623 | if (bs->bl.discard_alignment && | |
4624 | num >= bs->bl.discard_alignment && | |
4625 | sector_num % bs->bl.discard_alignment) { | |
4626 | if (num > bs->bl.discard_alignment) { | |
4627 | num = bs->bl.discard_alignment; | |
6f14da52 | 4628 | } |
d51e9fe5 PB |
4629 | num -= sector_num % bs->bl.discard_alignment; |
4630 | } | |
6f14da52 | 4631 | |
d51e9fe5 PB |
4632 | /* limit request size */ |
4633 | if (num > max_discard) { | |
4634 | num = max_discard; | |
4635 | } | |
6f14da52 | 4636 | |
d51e9fe5 | 4637 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 4638 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
4639 | } else { |
4640 | BlockDriverAIOCB *acb; | |
4641 | CoroutineIOCompletion co = { | |
4642 | .coroutine = qemu_coroutine_self(), | |
4643 | }; | |
4644 | ||
4645 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4646 | bdrv_co_io_em_complete, &co); | |
4647 | if (acb == NULL) { | |
4648 | return -EIO; | |
4649 | } else { | |
4650 | qemu_coroutine_yield(); | |
4651 | ret = co.ret; | |
6f14da52 | 4652 | } |
6f14da52 | 4653 | } |
7ce21016 | 4654 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 4655 | return ret; |
4265d620 | 4656 | } |
d51e9fe5 PB |
4657 | |
4658 | sector_num += num; | |
4659 | nb_sectors -= num; | |
4265d620 | 4660 | } |
d51e9fe5 | 4661 | return 0; |
4265d620 PB |
4662 | } |
4663 | ||
4664 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4665 | { | |
4666 | Coroutine *co; | |
4667 | RwCo rwco = { | |
4668 | .bs = bs, | |
4669 | .sector_num = sector_num, | |
4670 | .nb_sectors = nb_sectors, | |
4671 | .ret = NOT_DONE, | |
4672 | }; | |
4673 | ||
4674 | if (qemu_in_coroutine()) { | |
4675 | /* Fast-path if already in coroutine context */ | |
4676 | bdrv_discard_co_entry(&rwco); | |
4677 | } else { | |
4678 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4679 | qemu_coroutine_enter(co, &rwco); | |
4680 | while (rwco.ret == NOT_DONE) { | |
4681 | qemu_aio_wait(); | |
4682 | } | |
4683 | } | |
4684 | ||
4685 | return rwco.ret; | |
4686 | } | |
4687 | ||
19cb3738 FB |
4688 | /**************************************************************/ |
4689 | /* removable device support */ | |
4690 | ||
4691 | /** | |
4692 | * Return TRUE if the media is present | |
4693 | */ | |
4694 | int bdrv_is_inserted(BlockDriverState *bs) | |
4695 | { | |
4696 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4697 | |
19cb3738 FB |
4698 | if (!drv) |
4699 | return 0; | |
4700 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4701 | return 1; |
4702 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4703 | } |
4704 | ||
4705 | /** | |
8e49ca46 MA |
4706 | * Return whether the media changed since the last call to this |
4707 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4708 | */ |
4709 | int bdrv_media_changed(BlockDriverState *bs) | |
4710 | { | |
4711 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4712 | |
8e49ca46 MA |
4713 | if (drv && drv->bdrv_media_changed) { |
4714 | return drv->bdrv_media_changed(bs); | |
4715 | } | |
4716 | return -ENOTSUP; | |
19cb3738 FB |
4717 | } |
4718 | ||
4719 | /** | |
4720 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4721 | */ | |
f36f3949 | 4722 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4723 | { |
4724 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4725 | |
822e1cd1 MA |
4726 | if (drv && drv->bdrv_eject) { |
4727 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4728 | } |
6f382ed2 LC |
4729 | |
4730 | if (bs->device_name[0] != '\0') { | |
4731 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4732 | } | |
19cb3738 FB |
4733 | } |
4734 | ||
19cb3738 FB |
4735 | /** |
4736 | * Lock or unlock the media (if it is locked, the user won't be able | |
4737 | * to eject it manually). | |
4738 | */ | |
025e849a | 4739 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4740 | { |
4741 | BlockDriver *drv = bs->drv; | |
4742 | ||
025e849a | 4743 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4744 | |
025e849a MA |
4745 | if (drv && drv->bdrv_lock_medium) { |
4746 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4747 | } |
4748 | } | |
985a03b0 TS |
4749 | |
4750 | /* needed for generic scsi interface */ | |
4751 | ||
4752 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4753 | { | |
4754 | BlockDriver *drv = bs->drv; | |
4755 | ||
4756 | if (drv && drv->bdrv_ioctl) | |
4757 | return drv->bdrv_ioctl(bs, req, buf); | |
4758 | return -ENOTSUP; | |
4759 | } | |
7d780669 | 4760 | |
221f715d AL |
4761 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4762 | unsigned long int req, void *buf, | |
4763 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4764 | { |
221f715d | 4765 | BlockDriver *drv = bs->drv; |
7d780669 | 4766 | |
221f715d AL |
4767 | if (drv && drv->bdrv_aio_ioctl) |
4768 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4769 | return NULL; | |
7d780669 | 4770 | } |
e268ca52 | 4771 | |
7b6f9300 MA |
4772 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4773 | { | |
4774 | bs->buffer_alignment = align; | |
4775 | } | |
7cd1e32a | 4776 | |
e268ca52 AL |
4777 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4778 | { | |
4779 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4780 | } | |
7cd1e32a | 4781 | |
c53b1c51 SH |
4782 | /* |
4783 | * Check if all memory in this vector is sector aligned. | |
4784 | */ | |
4785 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4786 | { | |
4787 | int i; | |
4788 | ||
4789 | for (i = 0; i < qiov->niov; i++) { | |
4790 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4791 | return false; | |
4792 | } | |
4793 | } | |
4794 | ||
4795 | return true; | |
4796 | } | |
4797 | ||
e4654d2d | 4798 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity) |
7cd1e32a LS |
4799 | { |
4800 | int64_t bitmap_size; | |
e4654d2d | 4801 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 4802 | |
50717e94 PB |
4803 | assert((granularity & (granularity - 1)) == 0); |
4804 | ||
e4654d2d FZ |
4805 | granularity >>= BDRV_SECTOR_BITS; |
4806 | assert(granularity); | |
4807 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4808 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); | |
4809 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
4810 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
4811 | return bitmap; | |
4812 | } | |
4813 | ||
4814 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
4815 | { | |
4816 | BdrvDirtyBitmap *bm, *next; | |
4817 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
4818 | if (bm == bitmap) { | |
4819 | QLIST_REMOVE(bitmap, list); | |
4820 | hbitmap_free(bitmap->bitmap); | |
4821 | g_free(bitmap); | |
4822 | return; | |
a55eb92c | 4823 | } |
7cd1e32a LS |
4824 | } |
4825 | } | |
4826 | ||
21b56835 FZ |
4827 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
4828 | { | |
4829 | BdrvDirtyBitmap *bm; | |
4830 | BlockDirtyInfoList *list = NULL; | |
4831 | BlockDirtyInfoList **plist = &list; | |
4832 | ||
4833 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
4834 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); | |
4835 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); | |
4836 | info->count = bdrv_get_dirty_count(bs, bm); | |
4837 | info->granularity = | |
4838 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
4839 | entry->value = info; | |
4840 | *plist = entry; | |
4841 | plist = &entry->next; | |
4842 | } | |
4843 | ||
4844 | return list; | |
4845 | } | |
4846 | ||
e4654d2d | 4847 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 4848 | { |
e4654d2d FZ |
4849 | if (bitmap) { |
4850 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
4851 | } else { |
4852 | return 0; | |
4853 | } | |
4854 | } | |
4855 | ||
e4654d2d FZ |
4856 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
4857 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 4858 | { |
e4654d2d | 4859 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
4860 | } |
4861 | ||
4862 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4863 | int nr_sectors) | |
4864 | { | |
e4654d2d FZ |
4865 | BdrvDirtyBitmap *bitmap; |
4866 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
4867 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
4868 | } | |
1755da16 PB |
4869 | } |
4870 | ||
e4654d2d | 4871 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 4872 | { |
e4654d2d FZ |
4873 | BdrvDirtyBitmap *bitmap; |
4874 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
4875 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
4876 | } | |
7cd1e32a | 4877 | } |
aaa0eb75 | 4878 | |
e4654d2d | 4879 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 4880 | { |
e4654d2d | 4881 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 4882 | } |
f88e1a42 | 4883 | |
9fcb0251 FZ |
4884 | /* Get a reference to bs */ |
4885 | void bdrv_ref(BlockDriverState *bs) | |
4886 | { | |
4887 | bs->refcnt++; | |
4888 | } | |
4889 | ||
4890 | /* Release a previously grabbed reference to bs. | |
4891 | * If after releasing, reference count is zero, the BlockDriverState is | |
4892 | * deleted. */ | |
4893 | void bdrv_unref(BlockDriverState *bs) | |
4894 | { | |
4895 | assert(bs->refcnt > 0); | |
4896 | if (--bs->refcnt == 0) { | |
4897 | bdrv_delete(bs); | |
4898 | } | |
4899 | } | |
4900 | ||
db593f25 MT |
4901 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4902 | { | |
4903 | assert(bs->in_use != in_use); | |
4904 | bs->in_use = in_use; | |
4905 | } | |
4906 | ||
4907 | int bdrv_in_use(BlockDriverState *bs) | |
4908 | { | |
4909 | return bs->in_use; | |
4910 | } | |
4911 | ||
28a7282a LC |
4912 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4913 | { | |
d6bf279e | 4914 | bs->iostatus_enabled = true; |
58e21ef5 | 4915 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4916 | } |
4917 | ||
4918 | /* The I/O status is only enabled if the drive explicitly | |
4919 | * enables it _and_ the VM is configured to stop on errors */ | |
4920 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4921 | { | |
d6bf279e | 4922 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4923 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4924 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4925 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4926 | } |
4927 | ||
4928 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4929 | { | |
d6bf279e | 4930 | bs->iostatus_enabled = false; |
28a7282a LC |
4931 | } |
4932 | ||
4933 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4934 | { | |
4935 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4936 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4937 | if (bs->job) { |
4938 | block_job_iostatus_reset(bs->job); | |
4939 | } | |
28a7282a LC |
4940 | } |
4941 | } | |
4942 | ||
28a7282a LC |
4943 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4944 | { | |
3e1caa5f PB |
4945 | assert(bdrv_iostatus_is_enabled(bs)); |
4946 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4947 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4948 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4949 | } |
4950 | } | |
4951 | ||
a597e79c CH |
4952 | void |
4953 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4954 | enum BlockAcctType type) | |
4955 | { | |
4956 | assert(type < BDRV_MAX_IOTYPE); | |
4957 | ||
4958 | cookie->bytes = bytes; | |
c488c7f6 | 4959 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4960 | cookie->type = type; |
4961 | } | |
4962 | ||
4963 | void | |
4964 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4965 | { | |
4966 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4967 | ||
4968 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4969 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4970 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4971 | } |
4972 | ||
d92ada22 LC |
4973 | void bdrv_img_create(const char *filename, const char *fmt, |
4974 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4975 | char *options, uint64_t img_size, int flags, |
4976 | Error **errp, bool quiet) | |
f88e1a42 JS |
4977 | { |
4978 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4979 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 | 4980 | BlockDriver *drv, *proto_drv; |
96df67d1 | 4981 | BlockDriver *backing_drv = NULL; |
cc84d90f | 4982 | Error *local_err = NULL; |
f88e1a42 JS |
4983 | int ret = 0; |
4984 | ||
4985 | /* Find driver and parse its options */ | |
4986 | drv = bdrv_find_format(fmt); | |
4987 | if (!drv) { | |
71c79813 | 4988 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4989 | return; |
f88e1a42 JS |
4990 | } |
4991 | ||
98289620 | 4992 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 4993 | if (!proto_drv) { |
71c79813 | 4994 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4995 | return; |
f88e1a42 JS |
4996 | } |
4997 | ||
4998 | create_options = append_option_parameters(create_options, | |
4999 | drv->create_options); | |
5000 | create_options = append_option_parameters(create_options, | |
5001 | proto_drv->create_options); | |
5002 | ||
5003 | /* Create parameter list with default values */ | |
5004 | param = parse_option_parameters("", create_options, param); | |
5005 | ||
5006 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
5007 | ||
5008 | /* Parse -o options */ | |
5009 | if (options) { | |
5010 | param = parse_option_parameters(options, create_options, param); | |
5011 | if (param == NULL) { | |
71c79813 | 5012 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
5013 | goto out; |
5014 | } | |
5015 | } | |
5016 | ||
5017 | if (base_filename) { | |
5018 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
5019 | base_filename)) { | |
71c79813 LC |
5020 | error_setg(errp, "Backing file not supported for file format '%s'", |
5021 | fmt); | |
f88e1a42 JS |
5022 | goto out; |
5023 | } | |
5024 | } | |
5025 | ||
5026 | if (base_fmt) { | |
5027 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
5028 | error_setg(errp, "Backing file format not supported for file " |
5029 | "format '%s'", fmt); | |
f88e1a42 JS |
5030 | goto out; |
5031 | } | |
5032 | } | |
5033 | ||
792da93a JS |
5034 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
5035 | if (backing_file && backing_file->value.s) { | |
5036 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
5037 | error_setg(errp, "Error: Trying to create an image with the " |
5038 | "same filename as the backing file"); | |
792da93a JS |
5039 | goto out; |
5040 | } | |
5041 | } | |
5042 | ||
f88e1a42 JS |
5043 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
5044 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
5045 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
5046 | if (!backing_drv) { | |
71c79813 LC |
5047 | error_setg(errp, "Unknown backing file format '%s'", |
5048 | backing_fmt->value.s); | |
f88e1a42 JS |
5049 | goto out; |
5050 | } | |
5051 | } | |
5052 | ||
5053 | // The size for the image must always be specified, with one exception: | |
5054 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
5055 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
5056 | if (size && size->value.n == -1) { | |
f88e1a42 | 5057 | if (backing_file && backing_file->value.s) { |
66f6b814 | 5058 | BlockDriverState *bs; |
f88e1a42 | 5059 | uint64_t size; |
f88e1a42 | 5060 | char buf[32]; |
63090dac PB |
5061 | int back_flags; |
5062 | ||
5063 | /* backing files always opened read-only */ | |
5064 | back_flags = | |
5065 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5066 | |
f88e1a42 JS |
5067 | bs = bdrv_new(""); |
5068 | ||
de9c0cec | 5069 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
cc84d90f | 5070 | backing_drv, &local_err); |
f88e1a42 | 5071 | if (ret < 0) { |
cc84d90f HR |
5072 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
5073 | backing_file->value.s, | |
5074 | error_get_pretty(local_err)); | |
5075 | error_free(local_err); | |
5076 | local_err = NULL; | |
66f6b814 | 5077 | bdrv_unref(bs); |
f88e1a42 JS |
5078 | goto out; |
5079 | } | |
5080 | bdrv_get_geometry(bs, &size); | |
5081 | size *= 512; | |
5082 | ||
5083 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
5084 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
66f6b814 HR |
5085 | |
5086 | bdrv_unref(bs); | |
f88e1a42 | 5087 | } else { |
71c79813 | 5088 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5089 | goto out; |
5090 | } | |
5091 | } | |
5092 | ||
f382d43a MR |
5093 | if (!quiet) { |
5094 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
5095 | print_option_parameters(param); | |
5096 | puts(""); | |
5097 | } | |
cc84d90f HR |
5098 | ret = bdrv_create(drv, filename, param, &local_err); |
5099 | if (ret == -EFBIG) { | |
5100 | /* This is generally a better message than whatever the driver would | |
5101 | * deliver (especially because of the cluster_size_hint), since that | |
5102 | * is most probably not much different from "image too large". */ | |
5103 | const char *cluster_size_hint = ""; | |
5104 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
5105 | cluster_size_hint = " (try using a larger cluster size)"; | |
f88e1a42 | 5106 | } |
cc84d90f HR |
5107 | error_setg(errp, "The image size is too large for file format '%s'" |
5108 | "%s", fmt, cluster_size_hint); | |
5109 | error_free(local_err); | |
5110 | local_err = NULL; | |
f88e1a42 JS |
5111 | } |
5112 | ||
5113 | out: | |
5114 | free_option_parameters(create_options); | |
5115 | free_option_parameters(param); | |
5116 | ||
cc84d90f HR |
5117 | if (error_is_set(&local_err)) { |
5118 | error_propagate(errp, local_err); | |
5119 | } | |
f88e1a42 | 5120 | } |
85d126f3 SH |
5121 | |
5122 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5123 | { | |
5124 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
5125 | return qemu_get_aio_context(); | |
5126 | } | |
d616b224 SH |
5127 | |
5128 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
5129 | NotifierWithReturn *notifier) | |
5130 | { | |
5131 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5132 | } | |
6f176b48 HR |
5133 | |
5134 | int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options) | |
5135 | { | |
5136 | if (bs->drv->bdrv_amend_options == NULL) { | |
5137 | return -ENOTSUP; | |
5138 | } | |
5139 | return bs->drv->bdrv_amend_options(bs, options); | |
5140 | } | |
f6186f49 | 5141 | |
212a5a8f BC |
5142 | /* Used to recurse on single child block filters. |
5143 | * Single child block filter will store their child in bs->file. | |
5144 | */ | |
5145 | bool bdrv_generic_is_first_non_filter(BlockDriverState *bs, | |
5146 | BlockDriverState *candidate) | |
f6186f49 | 5147 | { |
212a5a8f BC |
5148 | if (!bs->drv) { |
5149 | return false; | |
5150 | } | |
5151 | ||
5152 | if (!bs->drv->authorizations[BS_IS_A_FILTER]) { | |
5153 | if (bs == candidate) { | |
5154 | return true; | |
5155 | } else { | |
5156 | return false; | |
5157 | } | |
5158 | } | |
5159 | ||
5160 | if (!bs->drv->authorizations[BS_FILTER_PASS_DOWN]) { | |
5161 | return false; | |
f6186f49 BC |
5162 | } |
5163 | ||
212a5a8f BC |
5164 | if (!bs->file) { |
5165 | return false; | |
5166 | } | |
5167 | ||
5168 | return bdrv_recurse_is_first_non_filter(bs->file, candidate); | |
5169 | } | |
5170 | ||
5171 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, | |
5172 | BlockDriverState *candidate) | |
5173 | { | |
5174 | if (bs->drv && bs->drv->bdrv_recurse_is_first_non_filter) { | |
5175 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); | |
f6186f49 BC |
5176 | } |
5177 | ||
212a5a8f | 5178 | return bdrv_generic_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5179 | } |
5180 | ||
212a5a8f BC |
5181 | /* This function checks if the candidate is the first non filter bs down it's |
5182 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5183 | * from the top. Some filters can choose not to pass down the recursion. | |
5184 | */ | |
5185 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5186 | { |
212a5a8f BC |
5187 | BlockDriverState *bs; |
5188 | ||
5189 | /* walk down the bs forest recursively */ | |
5190 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5191 | bool perm; | |
5192 | ||
5193 | if (!bs->file) { | |
5194 | continue; | |
5195 | } | |
5196 | ||
5197 | perm = bdrv_recurse_is_first_non_filter(bs->file, candidate); | |
5198 | ||
5199 | /* candidate is the first non filter */ | |
5200 | if (perm) { | |
5201 | return true; | |
5202 | } | |
5203 | } | |
5204 | ||
5205 | return false; | |
f6186f49 | 5206 | } |