]>
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" |
737e150e PB |
27 | #include "block/block_int.h" |
28 | #include "block/blockjob.h" | |
1de7afc9 | 29 | #include "qemu/module.h" |
7b1b5d19 | 30 | #include "qapi/qmp/qjson.h" |
9c17d615 | 31 | #include "sysemu/sysemu.h" |
1de7afc9 | 32 | #include "qemu/notify.h" |
737e150e | 33 | #include "block/coroutine.h" |
c13163fb | 34 | #include "block/qapi.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
a5ee7bd4 | 37 | #include "qapi-event.h" |
fc01f7e7 | 38 | |
71e72a19 | 39 | #ifdef CONFIG_BSD |
7674e7bf FB |
40 | #include <sys/types.h> |
41 | #include <sys/stat.h> | |
42 | #include <sys/ioctl.h> | |
72cf2d4f | 43 | #include <sys/queue.h> |
c5e97233 | 44 | #ifndef __DragonFly__ |
7674e7bf FB |
45 | #include <sys/disk.h> |
46 | #endif | |
c5e97233 | 47 | #endif |
7674e7bf | 48 | |
49dc768d AL |
49 | #ifdef _WIN32 |
50 | #include <windows.h> | |
51 | #endif | |
52 | ||
e4654d2d FZ |
53 | struct BdrvDirtyBitmap { |
54 | HBitmap *bitmap; | |
55 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
56 | }; | |
57 | ||
1c9805a3 SH |
58 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
59 | ||
7d4b4ba5 | 60 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
61 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
62 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 63 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
64 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 66 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
67 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
68 | int64_t sector_num, int nb_sectors, | |
69 | QEMUIOVector *iov); | |
70 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
71 | int64_t sector_num, int nb_sectors, | |
72 | QEMUIOVector *iov); | |
775aa8b6 KW |
73 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
74 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
470c0504 | 75 | BdrvRequestFlags flags); |
775aa8b6 KW |
76 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
f08f2dda | 78 | BdrvRequestFlags flags); |
b2a61371 SH |
79 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
80 | int64_t sector_num, | |
81 | QEMUIOVector *qiov, | |
82 | int nb_sectors, | |
d20d9b7c | 83 | BdrvRequestFlags flags, |
b2a61371 SH |
84 | BlockDriverCompletionFunc *cb, |
85 | void *opaque, | |
8c5873d6 | 86 | bool is_write); |
b2a61371 | 87 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 88 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 89 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 90 | |
1b7bdbc1 SH |
91 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
92 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 93 | |
dc364f4c BC |
94 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
95 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
96 | ||
8a22f02a SH |
97 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
98 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 99 | |
eb852011 MA |
100 | /* If non-zero, use only whitelisted block drivers */ |
101 | static int use_bdrv_whitelist; | |
102 | ||
9e0b22f4 SH |
103 | #ifdef _WIN32 |
104 | static int is_windows_drive_prefix(const char *filename) | |
105 | { | |
106 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
107 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
108 | filename[1] == ':'); | |
109 | } | |
110 | ||
111 | int is_windows_drive(const char *filename) | |
112 | { | |
113 | if (is_windows_drive_prefix(filename) && | |
114 | filename[2] == '\0') | |
115 | return 1; | |
116 | if (strstart(filename, "\\\\.\\", NULL) || | |
117 | strstart(filename, "//./", NULL)) | |
118 | return 1; | |
119 | return 0; | |
120 | } | |
121 | #endif | |
122 | ||
0563e191 | 123 | /* throttling disk I/O limits */ |
cc0681c4 BC |
124 | void bdrv_set_io_limits(BlockDriverState *bs, |
125 | ThrottleConfig *cfg) | |
98f90dba | 126 | { |
cc0681c4 | 127 | int i; |
98f90dba | 128 | |
cc0681c4 | 129 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 130 | |
cc0681c4 BC |
131 | for (i = 0; i < 2; i++) { |
132 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 133 | } |
cc0681c4 BC |
134 | } |
135 | ||
136 | /* this function drain all the throttled IOs */ | |
137 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
138 | { | |
139 | bool drained = false; | |
140 | bool enabled = bs->io_limits_enabled; | |
141 | int i; | |
142 | ||
143 | bs->io_limits_enabled = false; | |
144 | ||
145 | for (i = 0; i < 2; i++) { | |
146 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
147 | drained = true; | |
148 | } | |
149 | } | |
150 | ||
151 | bs->io_limits_enabled = enabled; | |
98f90dba | 152 | |
cc0681c4 | 153 | return drained; |
98f90dba ZYW |
154 | } |
155 | ||
cc0681c4 | 156 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 157 | { |
cc0681c4 | 158 | bs->io_limits_enabled = false; |
0563e191 | 159 | |
cc0681c4 BC |
160 | bdrv_start_throttled_reqs(bs); |
161 | ||
162 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
163 | } |
164 | ||
cc0681c4 | 165 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 166 | { |
cc0681c4 BC |
167 | BlockDriverState *bs = opaque; |
168 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
169 | } |
170 | ||
cc0681c4 | 171 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 172 | { |
cc0681c4 BC |
173 | BlockDriverState *bs = opaque; |
174 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
175 | } |
176 | ||
cc0681c4 BC |
177 | /* should be called before bdrv_set_io_limits if a limit is set */ |
178 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
179 | { | |
180 | assert(!bs->io_limits_enabled); | |
181 | throttle_init(&bs->throttle_state, | |
13af91eb | 182 | bdrv_get_aio_context(bs), |
cc0681c4 BC |
183 | QEMU_CLOCK_VIRTUAL, |
184 | bdrv_throttle_read_timer_cb, | |
185 | bdrv_throttle_write_timer_cb, | |
186 | bs); | |
187 | bs->io_limits_enabled = true; | |
188 | } | |
189 | ||
190 | /* This function makes an IO wait if needed | |
191 | * | |
192 | * @nb_sectors: the number of sectors of the IO | |
193 | * @is_write: is the IO a write | |
194 | */ | |
98f90dba | 195 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 196 | unsigned int bytes, |
cc0681c4 | 197 | bool is_write) |
98f90dba | 198 | { |
cc0681c4 BC |
199 | /* does this io must wait */ |
200 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 201 | |
cc0681c4 BC |
202 | /* if must wait or any request of this type throttled queue the IO */ |
203 | if (must_wait || | |
204 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
205 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
206 | } |
207 | ||
cc0681c4 | 208 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
209 | throttle_account(&bs->throttle_state, is_write, bytes); |
210 | ||
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 | ||
339064d5 KW |
221 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
222 | { | |
223 | if (!bs || !bs->drv) { | |
224 | /* 4k should be on the safe side */ | |
225 | return 4096; | |
226 | } | |
227 | ||
228 | return bs->bl.opt_mem_alignment; | |
229 | } | |
230 | ||
9e0b22f4 SH |
231 | /* check if the path starts with "<protocol>:" */ |
232 | static int path_has_protocol(const char *path) | |
233 | { | |
947995c0 PB |
234 | const char *p; |
235 | ||
9e0b22f4 SH |
236 | #ifdef _WIN32 |
237 | if (is_windows_drive(path) || | |
238 | is_windows_drive_prefix(path)) { | |
239 | return 0; | |
240 | } | |
947995c0 PB |
241 | p = path + strcspn(path, ":/\\"); |
242 | #else | |
243 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
244 | #endif |
245 | ||
947995c0 | 246 | return *p == ':'; |
9e0b22f4 SH |
247 | } |
248 | ||
83f64091 | 249 | int path_is_absolute(const char *path) |
3b0d4f61 | 250 | { |
21664424 FB |
251 | #ifdef _WIN32 |
252 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 253 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 254 | return 1; |
f53f4da9 PB |
255 | } |
256 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 257 | #else |
f53f4da9 | 258 | return (*path == '/'); |
3b9f94e1 | 259 | #endif |
3b0d4f61 FB |
260 | } |
261 | ||
83f64091 FB |
262 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
263 | path to it by considering it is relative to base_path. URL are | |
264 | supported. */ | |
265 | void path_combine(char *dest, int dest_size, | |
266 | const char *base_path, | |
267 | const char *filename) | |
3b0d4f61 | 268 | { |
83f64091 FB |
269 | const char *p, *p1; |
270 | int len; | |
271 | ||
272 | if (dest_size <= 0) | |
273 | return; | |
274 | if (path_is_absolute(filename)) { | |
275 | pstrcpy(dest, dest_size, filename); | |
276 | } else { | |
277 | p = strchr(base_path, ':'); | |
278 | if (p) | |
279 | p++; | |
280 | else | |
281 | p = base_path; | |
3b9f94e1 FB |
282 | p1 = strrchr(base_path, '/'); |
283 | #ifdef _WIN32 | |
284 | { | |
285 | const char *p2; | |
286 | p2 = strrchr(base_path, '\\'); | |
287 | if (!p1 || p2 > p1) | |
288 | p1 = p2; | |
289 | } | |
290 | #endif | |
83f64091 FB |
291 | if (p1) |
292 | p1++; | |
293 | else | |
294 | p1 = base_path; | |
295 | if (p1 > p) | |
296 | p = p1; | |
297 | len = p - base_path; | |
298 | if (len > dest_size - 1) | |
299 | len = dest_size - 1; | |
300 | memcpy(dest, base_path, len); | |
301 | dest[len] = '\0'; | |
302 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 303 | } |
3b0d4f61 FB |
304 | } |
305 | ||
dc5a1371 PB |
306 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
307 | { | |
308 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
309 | pstrcpy(dest, sz, bs->backing_file); | |
310 | } else { | |
311 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
312 | } | |
313 | } | |
314 | ||
5efa9d5a | 315 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 316 | { |
8c5873d6 SH |
317 | /* Block drivers without coroutine functions need emulation */ |
318 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
319 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
320 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
321 | ||
f8c35c1d SH |
322 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
323 | * the block driver lacks aio we need to emulate that too. | |
324 | */ | |
f9f05dc5 KW |
325 | if (!bdrv->bdrv_aio_readv) { |
326 | /* add AIO emulation layer */ | |
327 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
328 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 329 | } |
83f64091 | 330 | } |
b2e12bc6 | 331 | |
8a22f02a | 332 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 333 | } |
b338082b FB |
334 | |
335 | /* create a new block device (by default it is empty) */ | |
98522f63 | 336 | BlockDriverState *bdrv_new(const char *device_name, Error **errp) |
b338082b | 337 | { |
1b7bdbc1 | 338 | BlockDriverState *bs; |
fbe40ff7 | 339 | int i; |
b338082b | 340 | |
f2d953ec KW |
341 | if (bdrv_find(device_name)) { |
342 | error_setg(errp, "Device with id '%s' already exists", | |
343 | device_name); | |
344 | return NULL; | |
345 | } | |
346 | if (bdrv_find_node(device_name)) { | |
347 | error_setg(errp, "Device with node-name '%s' already exists", | |
348 | device_name); | |
349 | return NULL; | |
350 | } | |
351 | ||
7267c094 | 352 | bs = g_malloc0(sizeof(BlockDriverState)); |
e4654d2d | 353 | QLIST_INIT(&bs->dirty_bitmaps); |
b338082b | 354 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 355 | if (device_name[0] != '\0') { |
dc364f4c | 356 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
ea2384d3 | 357 | } |
fbe40ff7 FZ |
358 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
359 | QLIST_INIT(&bs->op_blockers[i]); | |
360 | } | |
28a7282a | 361 | bdrv_iostatus_disable(bs); |
d7d512f6 | 362 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 363 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
364 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
365 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 366 | bs->refcnt = 1; |
dcd04228 | 367 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 368 | |
b338082b FB |
369 | return bs; |
370 | } | |
371 | ||
d7d512f6 PB |
372 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
373 | { | |
374 | notifier_list_add(&bs->close_notifiers, notify); | |
375 | } | |
376 | ||
ea2384d3 FB |
377 | BlockDriver *bdrv_find_format(const char *format_name) |
378 | { | |
379 | BlockDriver *drv1; | |
8a22f02a SH |
380 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
381 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 382 | return drv1; |
8a22f02a | 383 | } |
ea2384d3 FB |
384 | } |
385 | return NULL; | |
386 | } | |
387 | ||
b64ec4e4 | 388 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 389 | { |
b64ec4e4 FZ |
390 | static const char *whitelist_rw[] = { |
391 | CONFIG_BDRV_RW_WHITELIST | |
392 | }; | |
393 | static const char *whitelist_ro[] = { | |
394 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
395 | }; |
396 | const char **p; | |
397 | ||
b64ec4e4 | 398 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 399 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 400 | } |
eb852011 | 401 | |
b64ec4e4 | 402 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
403 | if (!strcmp(drv->format_name, *p)) { |
404 | return 1; | |
405 | } | |
406 | } | |
b64ec4e4 FZ |
407 | if (read_only) { |
408 | for (p = whitelist_ro; *p; p++) { | |
409 | if (!strcmp(drv->format_name, *p)) { | |
410 | return 1; | |
411 | } | |
412 | } | |
413 | } | |
eb852011 MA |
414 | return 0; |
415 | } | |
416 | ||
b64ec4e4 FZ |
417 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
418 | bool read_only) | |
eb852011 MA |
419 | { |
420 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 421 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
422 | } |
423 | ||
5b7e1542 ZYW |
424 | typedef struct CreateCo { |
425 | BlockDriver *drv; | |
426 | char *filename; | |
83d0521a | 427 | QemuOpts *opts; |
5b7e1542 | 428 | int ret; |
cc84d90f | 429 | Error *err; |
5b7e1542 ZYW |
430 | } CreateCo; |
431 | ||
432 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
433 | { | |
cc84d90f HR |
434 | Error *local_err = NULL; |
435 | int ret; | |
436 | ||
5b7e1542 ZYW |
437 | CreateCo *cco = opaque; |
438 | assert(cco->drv); | |
439 | ||
c282e1fd | 440 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
84d18f06 | 441 | if (local_err) { |
cc84d90f HR |
442 | error_propagate(&cco->err, local_err); |
443 | } | |
444 | cco->ret = ret; | |
5b7e1542 ZYW |
445 | } |
446 | ||
0e7e1989 | 447 | int bdrv_create(BlockDriver *drv, const char* filename, |
83d0521a | 448 | QemuOpts *opts, Error **errp) |
ea2384d3 | 449 | { |
5b7e1542 ZYW |
450 | int ret; |
451 | ||
452 | Coroutine *co; | |
453 | CreateCo cco = { | |
454 | .drv = drv, | |
455 | .filename = g_strdup(filename), | |
83d0521a | 456 | .opts = opts, |
5b7e1542 | 457 | .ret = NOT_DONE, |
cc84d90f | 458 | .err = NULL, |
5b7e1542 ZYW |
459 | }; |
460 | ||
c282e1fd | 461 | if (!drv->bdrv_create) { |
cc84d90f | 462 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
463 | ret = -ENOTSUP; |
464 | goto out; | |
5b7e1542 ZYW |
465 | } |
466 | ||
467 | if (qemu_in_coroutine()) { | |
468 | /* Fast-path if already in coroutine context */ | |
469 | bdrv_create_co_entry(&cco); | |
470 | } else { | |
471 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
472 | qemu_coroutine_enter(co, &cco); | |
473 | while (cco.ret == NOT_DONE) { | |
b47ec2c4 | 474 | aio_poll(qemu_get_aio_context(), true); |
5b7e1542 ZYW |
475 | } |
476 | } | |
477 | ||
478 | ret = cco.ret; | |
cc84d90f | 479 | if (ret < 0) { |
84d18f06 | 480 | if (cco.err) { |
cc84d90f HR |
481 | error_propagate(errp, cco.err); |
482 | } else { | |
483 | error_setg_errno(errp, -ret, "Could not create image"); | |
484 | } | |
485 | } | |
0e7e1989 | 486 | |
80168bff LC |
487 | out: |
488 | g_free(cco.filename); | |
5b7e1542 | 489 | return ret; |
ea2384d3 FB |
490 | } |
491 | ||
c282e1fd | 492 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
84a12e66 CH |
493 | { |
494 | BlockDriver *drv; | |
cc84d90f HR |
495 | Error *local_err = NULL; |
496 | int ret; | |
84a12e66 | 497 | |
98289620 | 498 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 499 | if (drv == NULL) { |
cc84d90f | 500 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 501 | return -ENOENT; |
84a12e66 CH |
502 | } |
503 | ||
c282e1fd | 504 | ret = bdrv_create(drv, filename, opts, &local_err); |
84d18f06 | 505 | if (local_err) { |
cc84d90f HR |
506 | error_propagate(errp, local_err); |
507 | } | |
508 | return ret; | |
84a12e66 CH |
509 | } |
510 | ||
355ef4ac | 511 | int bdrv_refresh_limits(BlockDriverState *bs) |
d34682cd KW |
512 | { |
513 | BlockDriver *drv = bs->drv; | |
514 | ||
515 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
516 | ||
466ad822 KW |
517 | if (!drv) { |
518 | return 0; | |
519 | } | |
520 | ||
521 | /* Take some limits from the children as a default */ | |
522 | if (bs->file) { | |
523 | bdrv_refresh_limits(bs->file); | |
524 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; | |
339064d5 KW |
525 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
526 | } else { | |
527 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
528 | } |
529 | ||
530 | if (bs->backing_hd) { | |
531 | bdrv_refresh_limits(bs->backing_hd); | |
532 | bs->bl.opt_transfer_length = | |
533 | MAX(bs->bl.opt_transfer_length, | |
534 | bs->backing_hd->bl.opt_transfer_length); | |
339064d5 KW |
535 | bs->bl.opt_mem_alignment = |
536 | MAX(bs->bl.opt_mem_alignment, | |
537 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
538 | } |
539 | ||
540 | /* Then let the driver override it */ | |
541 | if (drv->bdrv_refresh_limits) { | |
d34682cd KW |
542 | return drv->bdrv_refresh_limits(bs); |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
eba25057 JM |
548 | /* |
549 | * Create a uniquely-named empty temporary file. | |
550 | * Return 0 upon success, otherwise a negative errno value. | |
551 | */ | |
552 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 553 | { |
eba25057 | 554 | #ifdef _WIN32 |
3b9f94e1 | 555 | char temp_dir[MAX_PATH]; |
eba25057 JM |
556 | /* GetTempFileName requires that its output buffer (4th param) |
557 | have length MAX_PATH or greater. */ | |
558 | assert(size >= MAX_PATH); | |
559 | return (GetTempPath(MAX_PATH, temp_dir) | |
560 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
561 | ? 0 : -GetLastError()); | |
d5249393 | 562 | #else |
67b915a5 | 563 | int fd; |
7ccfb2eb | 564 | const char *tmpdir; |
0badc1ee | 565 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
566 | if (!tmpdir) { |
567 | tmpdir = "/var/tmp"; | |
568 | } | |
eba25057 JM |
569 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
570 | return -EOVERFLOW; | |
571 | } | |
ea2384d3 | 572 | fd = mkstemp(filename); |
fe235a06 DH |
573 | if (fd < 0) { |
574 | return -errno; | |
575 | } | |
576 | if (close(fd) != 0) { | |
577 | unlink(filename); | |
eba25057 JM |
578 | return -errno; |
579 | } | |
580 | return 0; | |
d5249393 | 581 | #endif |
eba25057 | 582 | } |
fc01f7e7 | 583 | |
84a12e66 CH |
584 | /* |
585 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
586 | * recognized as a host CDROM. | |
587 | */ | |
588 | static BlockDriver *find_hdev_driver(const char *filename) | |
589 | { | |
590 | int score_max = 0, score; | |
591 | BlockDriver *drv = NULL, *d; | |
592 | ||
593 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
594 | if (d->bdrv_probe_device) { | |
595 | score = d->bdrv_probe_device(filename); | |
596 | if (score > score_max) { | |
597 | score_max = score; | |
598 | drv = d; | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | return drv; | |
604 | } | |
605 | ||
98289620 KW |
606 | BlockDriver *bdrv_find_protocol(const char *filename, |
607 | bool allow_protocol_prefix) | |
83f64091 FB |
608 | { |
609 | BlockDriver *drv1; | |
610 | char protocol[128]; | |
1cec71e3 | 611 | int len; |
83f64091 | 612 | const char *p; |
19cb3738 | 613 | |
66f82cee KW |
614 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
615 | ||
39508e7a CH |
616 | /* |
617 | * XXX(hch): we really should not let host device detection | |
618 | * override an explicit protocol specification, but moving this | |
619 | * later breaks access to device names with colons in them. | |
620 | * Thanks to the brain-dead persistent naming schemes on udev- | |
621 | * based Linux systems those actually are quite common. | |
622 | */ | |
623 | drv1 = find_hdev_driver(filename); | |
624 | if (drv1) { | |
625 | return drv1; | |
626 | } | |
627 | ||
98289620 | 628 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 629 | return bdrv_find_format("file"); |
84a12e66 | 630 | } |
98289620 | 631 | |
9e0b22f4 SH |
632 | p = strchr(filename, ':'); |
633 | assert(p != NULL); | |
1cec71e3 AL |
634 | len = p - filename; |
635 | if (len > sizeof(protocol) - 1) | |
636 | len = sizeof(protocol) - 1; | |
637 | memcpy(protocol, filename, len); | |
638 | protocol[len] = '\0'; | |
8a22f02a | 639 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 640 | if (drv1->protocol_name && |
8a22f02a | 641 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 642 | return drv1; |
8a22f02a | 643 | } |
83f64091 FB |
644 | } |
645 | return NULL; | |
646 | } | |
647 | ||
f500a6d3 | 648 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 649 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 650 | { |
f500a6d3 | 651 | int score, score_max; |
f3a5d3f8 CH |
652 | BlockDriver *drv1, *drv; |
653 | uint8_t buf[2048]; | |
f500a6d3 | 654 | int ret = 0; |
f8ea0b00 | 655 | |
08a00559 | 656 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 657 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
658 | drv = bdrv_find_format("raw"); |
659 | if (!drv) { | |
34b5d2c6 | 660 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
661 | ret = -ENOENT; |
662 | } | |
663 | *pdrv = drv; | |
664 | return ret; | |
1a396859 | 665 | } |
f8ea0b00 | 666 | |
83f64091 | 667 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 668 | if (ret < 0) { |
34b5d2c6 HR |
669 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
670 | "format"); | |
c98ac35d SW |
671 | *pdrv = NULL; |
672 | return ret; | |
83f64091 FB |
673 | } |
674 | ||
ea2384d3 | 675 | score_max = 0; |
84a12e66 | 676 | drv = NULL; |
8a22f02a | 677 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
678 | if (drv1->bdrv_probe) { |
679 | score = drv1->bdrv_probe(buf, ret, filename); | |
680 | if (score > score_max) { | |
681 | score_max = score; | |
682 | drv = drv1; | |
683 | } | |
0849bf08 | 684 | } |
fc01f7e7 | 685 | } |
c98ac35d | 686 | if (!drv) { |
34b5d2c6 HR |
687 | error_setg(errp, "Could not determine image format: No compatible " |
688 | "driver found"); | |
c98ac35d SW |
689 | ret = -ENOENT; |
690 | } | |
691 | *pdrv = drv; | |
692 | return ret; | |
ea2384d3 FB |
693 | } |
694 | ||
51762288 SH |
695 | /** |
696 | * Set the current 'total_sectors' value | |
697 | */ | |
698 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
699 | { | |
700 | BlockDriver *drv = bs->drv; | |
701 | ||
396759ad NB |
702 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
703 | if (bs->sg) | |
704 | return 0; | |
705 | ||
51762288 SH |
706 | /* query actual device if possible, otherwise just trust the hint */ |
707 | if (drv->bdrv_getlength) { | |
708 | int64_t length = drv->bdrv_getlength(bs); | |
709 | if (length < 0) { | |
710 | return length; | |
711 | } | |
7e382003 | 712 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
713 | } |
714 | ||
715 | bs->total_sectors = hint; | |
716 | return 0; | |
717 | } | |
718 | ||
9e8f1835 PB |
719 | /** |
720 | * Set open flags for a given discard mode | |
721 | * | |
722 | * Return 0 on success, -1 if the discard mode was invalid. | |
723 | */ | |
724 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
725 | { | |
726 | *flags &= ~BDRV_O_UNMAP; | |
727 | ||
728 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
729 | /* do nothing */ | |
730 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
731 | *flags |= BDRV_O_UNMAP; | |
732 | } else { | |
733 | return -1; | |
734 | } | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
c3993cdc SH |
739 | /** |
740 | * Set open flags for a given cache mode | |
741 | * | |
742 | * Return 0 on success, -1 if the cache mode was invalid. | |
743 | */ | |
744 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
745 | { | |
746 | *flags &= ~BDRV_O_CACHE_MASK; | |
747 | ||
748 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
749 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
750 | } else if (!strcmp(mode, "directsync")) { |
751 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
752 | } else if (!strcmp(mode, "writeback")) { |
753 | *flags |= BDRV_O_CACHE_WB; | |
754 | } else if (!strcmp(mode, "unsafe")) { | |
755 | *flags |= BDRV_O_CACHE_WB; | |
756 | *flags |= BDRV_O_NO_FLUSH; | |
757 | } else if (!strcmp(mode, "writethrough")) { | |
758 | /* this is the default */ | |
759 | } else { | |
760 | return -1; | |
761 | } | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
53fec9d3 SH |
766 | /** |
767 | * The copy-on-read flag is actually a reference count so multiple users may | |
768 | * use the feature without worrying about clobbering its previous state. | |
769 | * Copy-on-read stays enabled until all users have called to disable it. | |
770 | */ | |
771 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
772 | { | |
773 | bs->copy_on_read++; | |
774 | } | |
775 | ||
776 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
777 | { | |
778 | assert(bs->copy_on_read > 0); | |
779 | bs->copy_on_read--; | |
780 | } | |
781 | ||
b1e6fc08 KW |
782 | /* |
783 | * Returns the flags that a temporary snapshot should get, based on the | |
784 | * originally requested flags (the originally requested image will have flags | |
785 | * like a backing file) | |
786 | */ | |
787 | static int bdrv_temp_snapshot_flags(int flags) | |
788 | { | |
789 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; | |
790 | } | |
791 | ||
0b50cc88 KW |
792 | /* |
793 | * Returns the flags that bs->file should get, based on the given flags for | |
794 | * the parent BDS | |
795 | */ | |
796 | static int bdrv_inherited_flags(int flags) | |
797 | { | |
798 | /* Enable protocol handling, disable format probing for bs->file */ | |
799 | flags |= BDRV_O_PROTOCOL; | |
800 | ||
801 | /* Our block drivers take care to send flushes and respect unmap policy, | |
802 | * so we can enable both unconditionally on lower layers. */ | |
803 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; | |
804 | ||
0b50cc88 | 805 | /* Clear flags that only apply to the top layer */ |
5669b44d | 806 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
0b50cc88 KW |
807 | |
808 | return flags; | |
809 | } | |
810 | ||
317fc44e KW |
811 | /* |
812 | * Returns the flags that bs->backing_hd should get, based on the given flags | |
813 | * for the parent BDS | |
814 | */ | |
815 | static int bdrv_backing_flags(int flags) | |
816 | { | |
817 | /* backing files always opened read-only */ | |
818 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); | |
819 | ||
820 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 821 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e KW |
822 | |
823 | return flags; | |
824 | } | |
825 | ||
7b272452 KW |
826 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
827 | { | |
828 | int open_flags = flags | BDRV_O_CACHE_WB; | |
829 | ||
830 | /* | |
831 | * Clear flags that are internal to the block layer before opening the | |
832 | * image. | |
833 | */ | |
20cca275 | 834 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 KW |
835 | |
836 | /* | |
837 | * Snapshots should be writable. | |
838 | */ | |
8bfea15d | 839 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
840 | open_flags |= BDRV_O_RDWR; |
841 | } | |
842 | ||
843 | return open_flags; | |
844 | } | |
845 | ||
636ea370 KW |
846 | static void bdrv_assign_node_name(BlockDriverState *bs, |
847 | const char *node_name, | |
848 | Error **errp) | |
6913c0c2 BC |
849 | { |
850 | if (!node_name) { | |
636ea370 | 851 | return; |
6913c0c2 BC |
852 | } |
853 | ||
854 | /* empty string node name is invalid */ | |
855 | if (node_name[0] == '\0') { | |
856 | error_setg(errp, "Empty node name"); | |
636ea370 | 857 | return; |
6913c0c2 BC |
858 | } |
859 | ||
0c5e94ee BC |
860 | /* takes care of avoiding namespaces collisions */ |
861 | if (bdrv_find(node_name)) { | |
862 | error_setg(errp, "node-name=%s is conflicting with a device id", | |
863 | node_name); | |
636ea370 | 864 | return; |
0c5e94ee BC |
865 | } |
866 | ||
6913c0c2 BC |
867 | /* takes care of avoiding duplicates node names */ |
868 | if (bdrv_find_node(node_name)) { | |
869 | error_setg(errp, "Duplicate node name"); | |
636ea370 | 870 | return; |
6913c0c2 BC |
871 | } |
872 | ||
873 | /* copy node name into the bs and insert it into the graph list */ | |
874 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
875 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
6913c0c2 BC |
876 | } |
877 | ||
57915332 KW |
878 | /* |
879 | * Common part for opening disk images and files | |
b6ad491a KW |
880 | * |
881 | * Removes all processed options from *options. | |
57915332 | 882 | */ |
f500a6d3 | 883 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 884 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
885 | { |
886 | int ret, open_flags; | |
035fccdf | 887 | const char *filename; |
6913c0c2 | 888 | const char *node_name = NULL; |
34b5d2c6 | 889 | Error *local_err = NULL; |
57915332 KW |
890 | |
891 | assert(drv != NULL); | |
6405875c | 892 | assert(bs->file == NULL); |
707ff828 | 893 | assert(options != NULL && bs->options != options); |
57915332 | 894 | |
45673671 KW |
895 | if (file != NULL) { |
896 | filename = file->filename; | |
897 | } else { | |
898 | filename = qdict_get_try_str(options, "filename"); | |
899 | } | |
900 | ||
765003db KW |
901 | if (drv->bdrv_needs_filename && !filename) { |
902 | error_setg(errp, "The '%s' block driver requires a file name", | |
903 | drv->format_name); | |
904 | return -EINVAL; | |
905 | } | |
906 | ||
45673671 | 907 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 908 | |
6913c0c2 | 909 | node_name = qdict_get_try_str(options, "node-name"); |
636ea370 | 910 | bdrv_assign_node_name(bs, node_name, &local_err); |
0fb6395c | 911 | if (local_err) { |
636ea370 KW |
912 | error_propagate(errp, local_err); |
913 | return -EINVAL; | |
6913c0c2 BC |
914 | } |
915 | qdict_del(options, "node-name"); | |
916 | ||
5d186eb0 KW |
917 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
918 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
919 | * and return immediately. */ | |
920 | if (file != NULL && drv->bdrv_file_open) { | |
921 | bdrv_swap(file, bs); | |
922 | return 0; | |
923 | } | |
924 | ||
57915332 | 925 | bs->open_flags = flags; |
1b7fd729 | 926 | bs->guest_block_size = 512; |
c25f53b0 | 927 | bs->request_alignment = 512; |
0d51b4de | 928 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
929 | open_flags = bdrv_open_flags(bs, flags); |
930 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
20cca275 | 931 | bs->growable = !!(flags & BDRV_O_PROTOCOL); |
b64ec4e4 FZ |
932 | |
933 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
934 | error_setg(errp, |
935 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
936 | ? "Driver '%s' can only be used for read-only devices" | |
937 | : "Driver '%s' is not whitelisted", | |
938 | drv->format_name); | |
b64ec4e4 FZ |
939 | return -ENOTSUP; |
940 | } | |
57915332 | 941 | |
53fec9d3 | 942 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
943 | if (flags & BDRV_O_COPY_ON_READ) { |
944 | if (!bs->read_only) { | |
945 | bdrv_enable_copy_on_read(bs); | |
946 | } else { | |
947 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
948 | return -EINVAL; | |
949 | } | |
53fec9d3 SH |
950 | } |
951 | ||
c2ad1b0c KW |
952 | if (filename != NULL) { |
953 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
954 | } else { | |
955 | bs->filename[0] = '\0'; | |
956 | } | |
57915332 | 957 | |
57915332 | 958 | bs->drv = drv; |
7267c094 | 959 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 960 | |
03f541bd | 961 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 962 | |
66f82cee KW |
963 | /* Open the image, either directly or using a protocol */ |
964 | if (drv->bdrv_file_open) { | |
5d186eb0 | 965 | assert(file == NULL); |
030be321 | 966 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 967 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 968 | } else { |
2af5ef70 | 969 | if (file == NULL) { |
34b5d2c6 HR |
970 | error_setg(errp, "Can't use '%s' as a block driver for the " |
971 | "protocol level", drv->format_name); | |
2af5ef70 KW |
972 | ret = -EINVAL; |
973 | goto free_and_fail; | |
974 | } | |
f500a6d3 | 975 | bs->file = file; |
34b5d2c6 | 976 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
977 | } |
978 | ||
57915332 | 979 | if (ret < 0) { |
84d18f06 | 980 | if (local_err) { |
34b5d2c6 | 981 | error_propagate(errp, local_err); |
2fa9aa59 DH |
982 | } else if (bs->filename[0]) { |
983 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
984 | } else { |
985 | error_setg_errno(errp, -ret, "Could not open image"); | |
986 | } | |
57915332 KW |
987 | goto free_and_fail; |
988 | } | |
989 | ||
51762288 SH |
990 | ret = refresh_total_sectors(bs, bs->total_sectors); |
991 | if (ret < 0) { | |
34b5d2c6 | 992 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 993 | goto free_and_fail; |
57915332 | 994 | } |
51762288 | 995 | |
d34682cd | 996 | bdrv_refresh_limits(bs); |
c25f53b0 | 997 | assert(bdrv_opt_mem_align(bs) != 0); |
47ea2de2 | 998 | assert((bs->request_alignment != 0) || bs->sg); |
57915332 KW |
999 | return 0; |
1000 | ||
1001 | free_and_fail: | |
f500a6d3 | 1002 | bs->file = NULL; |
7267c094 | 1003 | g_free(bs->opaque); |
57915332 KW |
1004 | bs->opaque = NULL; |
1005 | bs->drv = NULL; | |
1006 | return ret; | |
1007 | } | |
1008 | ||
5e5c4f63 KW |
1009 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1010 | { | |
1011 | QObject *options_obj; | |
1012 | QDict *options; | |
1013 | int ret; | |
1014 | ||
1015 | ret = strstart(filename, "json:", &filename); | |
1016 | assert(ret); | |
1017 | ||
1018 | options_obj = qobject_from_json(filename); | |
1019 | if (!options_obj) { | |
1020 | error_setg(errp, "Could not parse the JSON options"); | |
1021 | return NULL; | |
1022 | } | |
1023 | ||
1024 | if (qobject_type(options_obj) != QTYPE_QDICT) { | |
1025 | qobject_decref(options_obj); | |
1026 | error_setg(errp, "Invalid JSON object given"); | |
1027 | return NULL; | |
1028 | } | |
1029 | ||
1030 | options = qobject_to_qdict(options_obj); | |
1031 | qdict_flatten(options); | |
1032 | ||
1033 | return options; | |
1034 | } | |
1035 | ||
b6ce07aa | 1036 | /* |
f54120ff KW |
1037 | * Fills in default options for opening images and converts the legacy |
1038 | * filename/flags pair to option QDict entries. | |
b6ce07aa | 1039 | */ |
5e5c4f63 | 1040 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
17b005f1 | 1041 | BlockDriver *drv, Error **errp) |
ea2384d3 | 1042 | { |
5e5c4f63 | 1043 | const char *filename = *pfilename; |
c2ad1b0c | 1044 | const char *drvname; |
462f5bcf | 1045 | bool protocol = flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 1046 | bool parse_filename = false; |
34b5d2c6 | 1047 | Error *local_err = NULL; |
83f64091 | 1048 | |
5e5c4f63 KW |
1049 | /* Parse json: pseudo-protocol */ |
1050 | if (filename && g_str_has_prefix(filename, "json:")) { | |
1051 | QDict *json_options = parse_json_filename(filename, &local_err); | |
1052 | if (local_err) { | |
1053 | error_propagate(errp, local_err); | |
1054 | return -EINVAL; | |
1055 | } | |
1056 | ||
1057 | /* Options given in the filename have lower priority than options | |
1058 | * specified directly */ | |
1059 | qdict_join(*options, json_options, false); | |
1060 | QDECREF(json_options); | |
1061 | *pfilename = filename = NULL; | |
1062 | } | |
1063 | ||
035fccdf | 1064 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 1065 | if (protocol && filename) { |
f54120ff KW |
1066 | if (!qdict_haskey(*options, "filename")) { |
1067 | qdict_put(*options, "filename", qstring_from_str(filename)); | |
1068 | parse_filename = true; | |
1069 | } else { | |
1070 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
1071 | "the same time"); | |
1072 | return -EINVAL; | |
1073 | } | |
035fccdf KW |
1074 | } |
1075 | ||
c2ad1b0c | 1076 | /* Find the right block driver */ |
f54120ff | 1077 | filename = qdict_get_try_str(*options, "filename"); |
5acd9d81 | 1078 | drvname = qdict_get_try_str(*options, "driver"); |
f54120ff | 1079 | |
17b005f1 KW |
1080 | if (drv) { |
1081 | if (drvname) { | |
1082 | error_setg(errp, "Driver specified twice"); | |
1083 | return -EINVAL; | |
1084 | } | |
1085 | drvname = drv->format_name; | |
1086 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1087 | } else { | |
1088 | if (!drvname && protocol) { | |
1089 | if (filename) { | |
1090 | drv = bdrv_find_protocol(filename, parse_filename); | |
1091 | if (!drv) { | |
1092 | error_setg(errp, "Unknown protocol"); | |
1093 | return -EINVAL; | |
1094 | } | |
1095 | ||
1096 | drvname = drv->format_name; | |
1097 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1098 | } else { | |
1099 | error_setg(errp, "Must specify either driver or file"); | |
f54120ff KW |
1100 | return -EINVAL; |
1101 | } | |
17b005f1 KW |
1102 | } else if (drvname) { |
1103 | drv = bdrv_find_format(drvname); | |
1104 | if (!drv) { | |
1105 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1106 | return -ENOENT; | |
1107 | } | |
98289620 | 1108 | } |
c2ad1b0c KW |
1109 | } |
1110 | ||
17b005f1 | 1111 | assert(drv || !protocol); |
c2ad1b0c | 1112 | |
f54120ff | 1113 | /* Driver-specific filename parsing */ |
17b005f1 | 1114 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1115 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1116 | if (local_err) { |
34b5d2c6 | 1117 | error_propagate(errp, local_err); |
f54120ff | 1118 | return -EINVAL; |
6963a30d | 1119 | } |
cd5d031e HR |
1120 | |
1121 | if (!drv->bdrv_needs_filename) { | |
1122 | qdict_del(*options, "filename"); | |
cd5d031e | 1123 | } |
6963a30d KW |
1124 | } |
1125 | ||
f54120ff KW |
1126 | return 0; |
1127 | } | |
1128 | ||
8d24cce1 FZ |
1129 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
1130 | { | |
1131 | ||
826b6ca0 FZ |
1132 | if (bs->backing_hd) { |
1133 | assert(bs->backing_blocker); | |
1134 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); | |
1135 | } else if (backing_hd) { | |
1136 | error_setg(&bs->backing_blocker, | |
1137 | "device is used as backing hd of '%s'", | |
1138 | bs->device_name); | |
1139 | } | |
1140 | ||
8d24cce1 FZ |
1141 | bs->backing_hd = backing_hd; |
1142 | if (!backing_hd) { | |
826b6ca0 FZ |
1143 | error_free(bs->backing_blocker); |
1144 | bs->backing_blocker = NULL; | |
8d24cce1 FZ |
1145 | goto out; |
1146 | } | |
1147 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
1148 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); | |
1149 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), | |
1150 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
826b6ca0 FZ |
1151 | |
1152 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); | |
1153 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ | |
1154 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, | |
1155 | bs->backing_blocker); | |
8d24cce1 FZ |
1156 | out: |
1157 | bdrv_refresh_limits(bs); | |
1158 | } | |
1159 | ||
31ca6d07 KW |
1160 | /* |
1161 | * Opens the backing file for a BlockDriverState if not yet open | |
1162 | * | |
1163 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1164 | * empty set of options. The reference to the QDict is transferred to this | |
1165 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1166 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1167 | */ | |
34b5d2c6 | 1168 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 | 1169 | { |
1ba4b6a5 | 1170 | char *backing_filename = g_malloc0(PATH_MAX); |
317fc44e | 1171 | int ret = 0; |
9156df12 | 1172 | BlockDriver *back_drv = NULL; |
8d24cce1 | 1173 | BlockDriverState *backing_hd; |
34b5d2c6 | 1174 | Error *local_err = NULL; |
9156df12 PB |
1175 | |
1176 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1177 | QDECREF(options); |
1ba4b6a5 | 1178 | goto free_exit; |
9156df12 PB |
1179 | } |
1180 | ||
31ca6d07 KW |
1181 | /* NULL means an empty set of options */ |
1182 | if (options == NULL) { | |
1183 | options = qdict_new(); | |
1184 | } | |
1185 | ||
9156df12 | 1186 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1187 | if (qdict_haskey(options, "file.filename")) { |
1188 | backing_filename[0] = '\0'; | |
1189 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1190 | QDECREF(options); |
1ba4b6a5 | 1191 | goto free_exit; |
dbecebdd | 1192 | } else { |
1ba4b6a5 | 1193 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX); |
9156df12 PB |
1194 | } |
1195 | ||
8ee79e70 KW |
1196 | if (!bs->drv || !bs->drv->supports_backing) { |
1197 | ret = -EINVAL; | |
1198 | error_setg(errp, "Driver doesn't support backing files"); | |
1199 | QDECREF(options); | |
1200 | goto free_exit; | |
1201 | } | |
1202 | ||
8d24cce1 FZ |
1203 | backing_hd = bdrv_new("", errp); |
1204 | ||
9156df12 PB |
1205 | if (bs->backing_format[0] != '\0') { |
1206 | back_drv = bdrv_find_format(bs->backing_format); | |
1207 | } | |
1208 | ||
f67503e5 | 1209 | assert(bs->backing_hd == NULL); |
8d24cce1 | 1210 | ret = bdrv_open(&backing_hd, |
ddf5636d | 1211 | *backing_filename ? backing_filename : NULL, NULL, options, |
317fc44e | 1212 | bdrv_backing_flags(bs->open_flags), back_drv, &local_err); |
9156df12 | 1213 | if (ret < 0) { |
8d24cce1 FZ |
1214 | bdrv_unref(backing_hd); |
1215 | backing_hd = NULL; | |
9156df12 | 1216 | bs->open_flags |= BDRV_O_NO_BACKING; |
b04b6b6e FZ |
1217 | error_setg(errp, "Could not open backing file: %s", |
1218 | error_get_pretty(local_err)); | |
1219 | error_free(local_err); | |
1ba4b6a5 | 1220 | goto free_exit; |
9156df12 | 1221 | } |
8d24cce1 | 1222 | bdrv_set_backing_hd(bs, backing_hd); |
d80ac658 | 1223 | |
1ba4b6a5 BC |
1224 | free_exit: |
1225 | g_free(backing_filename); | |
1226 | return ret; | |
9156df12 PB |
1227 | } |
1228 | ||
da557aac HR |
1229 | /* |
1230 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1231 | * device's options. | |
1232 | * | |
da557aac HR |
1233 | * If allow_none is true, no image will be opened if filename is false and no |
1234 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1235 | * | |
1236 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1237 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1238 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1239 | * BlockdevRef. | |
1240 | * | |
1241 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1242 | * |
1243 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1244 | */ |
1245 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1246 | QDict *options, const char *bdref_key, int flags, | |
f7d9fd8c | 1247 | bool allow_none, Error **errp) |
da557aac HR |
1248 | { |
1249 | QDict *image_options; | |
1250 | int ret; | |
1251 | char *bdref_key_dot; | |
1252 | const char *reference; | |
1253 | ||
f67503e5 HR |
1254 | assert(pbs); |
1255 | assert(*pbs == NULL); | |
1256 | ||
da557aac HR |
1257 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1258 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1259 | g_free(bdref_key_dot); | |
1260 | ||
1261 | reference = qdict_get_try_str(options, bdref_key); | |
1262 | if (!filename && !reference && !qdict_size(image_options)) { | |
1263 | if (allow_none) { | |
1264 | ret = 0; | |
1265 | } else { | |
1266 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1267 | bdref_key); | |
1268 | ret = -EINVAL; | |
1269 | } | |
b20e61e0 | 1270 | QDECREF(image_options); |
da557aac HR |
1271 | goto done; |
1272 | } | |
1273 | ||
f7d9fd8c | 1274 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
da557aac HR |
1275 | |
1276 | done: | |
1277 | qdict_del(options, bdref_key); | |
1278 | return ret; | |
1279 | } | |
1280 | ||
6b8aeca5 | 1281 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
b998875d KW |
1282 | { |
1283 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 1284 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d KW |
1285 | int64_t total_size; |
1286 | BlockDriver *bdrv_qcow2; | |
83d0521a | 1287 | QemuOpts *opts = NULL; |
b998875d KW |
1288 | QDict *snapshot_options; |
1289 | BlockDriverState *bs_snapshot; | |
1290 | Error *local_err; | |
1291 | int ret; | |
1292 | ||
1293 | /* if snapshot, we create a temporary backing file and open it | |
1294 | instead of opening 'filename' directly */ | |
1295 | ||
1296 | /* Get the required size from the image */ | |
f187743a KW |
1297 | total_size = bdrv_getlength(bs); |
1298 | if (total_size < 0) { | |
6b8aeca5 | 1299 | ret = total_size; |
f187743a | 1300 | error_setg_errno(errp, -total_size, "Could not get image size"); |
1ba4b6a5 | 1301 | goto out; |
f187743a KW |
1302 | } |
1303 | total_size &= BDRV_SECTOR_MASK; | |
b998875d KW |
1304 | |
1305 | /* Create the temporary image */ | |
1ba4b6a5 | 1306 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
1307 | if (ret < 0) { |
1308 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 1309 | goto out; |
b998875d KW |
1310 | } |
1311 | ||
1312 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
c282e1fd CL |
1313 | opts = qemu_opts_create(bdrv_qcow2->create_opts, NULL, 0, |
1314 | &error_abort); | |
83d0521a | 1315 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size); |
c282e1fd | 1316 | ret = bdrv_create(bdrv_qcow2, tmp_filename, opts, &local_err); |
83d0521a | 1317 | qemu_opts_del(opts); |
b998875d KW |
1318 | if (ret < 0) { |
1319 | error_setg_errno(errp, -ret, "Could not create temporary overlay " | |
1320 | "'%s': %s", tmp_filename, | |
1321 | error_get_pretty(local_err)); | |
1322 | error_free(local_err); | |
1ba4b6a5 | 1323 | goto out; |
b998875d KW |
1324 | } |
1325 | ||
1326 | /* Prepare a new options QDict for the temporary file */ | |
1327 | snapshot_options = qdict_new(); | |
1328 | qdict_put(snapshot_options, "file.driver", | |
1329 | qstring_from_str("file")); | |
1330 | qdict_put(snapshot_options, "file.filename", | |
1331 | qstring_from_str(tmp_filename)); | |
1332 | ||
98522f63 | 1333 | bs_snapshot = bdrv_new("", &error_abort); |
b998875d KW |
1334 | |
1335 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, | |
b1e6fc08 | 1336 | flags, bdrv_qcow2, &local_err); |
b998875d KW |
1337 | if (ret < 0) { |
1338 | error_propagate(errp, local_err); | |
1ba4b6a5 | 1339 | goto out; |
b998875d KW |
1340 | } |
1341 | ||
1342 | bdrv_append(bs_snapshot, bs); | |
1ba4b6a5 BC |
1343 | |
1344 | out: | |
1345 | g_free(tmp_filename); | |
6b8aeca5 | 1346 | return ret; |
b998875d KW |
1347 | } |
1348 | ||
b6ce07aa KW |
1349 | /* |
1350 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1351 | * |
1352 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1353 | * empty set of options. The reference to the QDict belongs to the block layer | |
1354 | * after the call (even on failure), so if the caller intends to reuse the | |
1355 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1356 | * |
1357 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1358 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1359 | * |
1360 | * The reference parameter may be used to specify an existing block device which | |
1361 | * should be opened. If specified, neither options nor a filename may be given, | |
1362 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1363 | */ |
ddf5636d HR |
1364 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1365 | const char *reference, QDict *options, int flags, | |
1366 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1367 | { |
b6ce07aa | 1368 | int ret; |
f67503e5 | 1369 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1370 | const char *drvname; |
34b5d2c6 | 1371 | Error *local_err = NULL; |
b1e6fc08 | 1372 | int snapshot_flags = 0; |
712e7874 | 1373 | |
f67503e5 HR |
1374 | assert(pbs); |
1375 | ||
ddf5636d HR |
1376 | if (reference) { |
1377 | bool options_non_empty = options ? qdict_size(options) : false; | |
1378 | QDECREF(options); | |
1379 | ||
1380 | if (*pbs) { | |
1381 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1382 | "another block device"); | |
1383 | return -EINVAL; | |
1384 | } | |
1385 | ||
1386 | if (filename || options_non_empty) { | |
1387 | error_setg(errp, "Cannot reference an existing block device with " | |
1388 | "additional options or a new filename"); | |
1389 | return -EINVAL; | |
1390 | } | |
1391 | ||
1392 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1393 | if (!bs) { | |
1394 | return -ENODEV; | |
1395 | } | |
1396 | bdrv_ref(bs); | |
1397 | *pbs = bs; | |
1398 | return 0; | |
1399 | } | |
1400 | ||
f67503e5 HR |
1401 | if (*pbs) { |
1402 | bs = *pbs; | |
1403 | } else { | |
98522f63 | 1404 | bs = bdrv_new("", &error_abort); |
f67503e5 HR |
1405 | } |
1406 | ||
de9c0cec KW |
1407 | /* NULL means an empty set of options */ |
1408 | if (options == NULL) { | |
1409 | options = qdict_new(); | |
1410 | } | |
1411 | ||
17b005f1 | 1412 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
462f5bcf KW |
1413 | if (local_err) { |
1414 | goto fail; | |
1415 | } | |
1416 | ||
76c591b0 KW |
1417 | /* Find the right image format driver */ |
1418 | drv = NULL; | |
1419 | drvname = qdict_get_try_str(options, "driver"); | |
1420 | if (drvname) { | |
1421 | drv = bdrv_find_format(drvname); | |
1422 | qdict_del(options, "driver"); | |
1423 | if (!drv) { | |
1424 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
1425 | ret = -EINVAL; | |
1426 | goto fail; | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
1431 | if (drv && !drv->bdrv_file_open) { | |
1432 | /* If the user explicitly wants a format driver here, we'll need to add | |
1433 | * another layer for the protocol in bs->file */ | |
1434 | flags &= ~BDRV_O_PROTOCOL; | |
1435 | } | |
1436 | ||
de9c0cec | 1437 | bs->options = options; |
b6ad491a | 1438 | options = qdict_clone_shallow(options); |
de9c0cec | 1439 | |
f500a6d3 | 1440 | /* Open image file without format layer */ |
f4788adc KW |
1441 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
1442 | if (flags & BDRV_O_RDWR) { | |
1443 | flags |= BDRV_O_ALLOW_RDWR; | |
1444 | } | |
1445 | if (flags & BDRV_O_SNAPSHOT) { | |
1446 | snapshot_flags = bdrv_temp_snapshot_flags(flags); | |
1447 | flags = bdrv_backing_flags(flags); | |
1448 | } | |
f500a6d3 | 1449 | |
f4788adc KW |
1450 | assert(file == NULL); |
1451 | ret = bdrv_open_image(&file, filename, options, "file", | |
1452 | bdrv_inherited_flags(flags), | |
1453 | true, &local_err); | |
1454 | if (ret < 0) { | |
1455 | goto fail; | |
1456 | } | |
f500a6d3 KW |
1457 | } |
1458 | ||
76c591b0 KW |
1459 | /* Image format probing */ |
1460 | if (!drv && file) { | |
17b005f1 KW |
1461 | ret = find_image_format(file, filename, &drv, &local_err); |
1462 | if (ret < 0) { | |
8bfea15d | 1463 | goto fail; |
2a05cbe4 | 1464 | } |
76c591b0 | 1465 | } else if (!drv) { |
17b005f1 KW |
1466 | error_setg(errp, "Must specify either driver or file"); |
1467 | ret = -EINVAL; | |
8bfea15d | 1468 | goto fail; |
ea2384d3 | 1469 | } |
b6ce07aa KW |
1470 | |
1471 | /* Open the image */ | |
34b5d2c6 | 1472 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1473 | if (ret < 0) { |
8bfea15d | 1474 | goto fail; |
6987307c CH |
1475 | } |
1476 | ||
2a05cbe4 | 1477 | if (file && (bs->file != file)) { |
4f6fd349 | 1478 | bdrv_unref(file); |
f500a6d3 KW |
1479 | file = NULL; |
1480 | } | |
1481 | ||
b6ce07aa | 1482 | /* If there is a backing file, use it */ |
9156df12 | 1483 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1484 | QDict *backing_options; |
1485 | ||
5726d872 | 1486 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1487 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1488 | if (ret < 0) { |
b6ad491a | 1489 | goto close_and_fail; |
b6ce07aa | 1490 | } |
b6ce07aa KW |
1491 | } |
1492 | ||
b998875d KW |
1493 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
1494 | * temporary snapshot afterwards. */ | |
b1e6fc08 | 1495 | if (snapshot_flags) { |
6b8aeca5 | 1496 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
b998875d | 1497 | if (local_err) { |
b998875d KW |
1498 | goto close_and_fail; |
1499 | } | |
1500 | } | |
1501 | ||
b6ad491a | 1502 | /* Check if any unknown options were used */ |
5acd9d81 | 1503 | if (options && (qdict_size(options) != 0)) { |
b6ad491a | 1504 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
1505 | if (flags & BDRV_O_PROTOCOL) { |
1506 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
1507 | "'%s'", drv->format_name, entry->key); | |
1508 | } else { | |
1509 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " | |
1510 | "support the option '%s'", drv->format_name, | |
1511 | bs->device_name, entry->key); | |
1512 | } | |
b6ad491a KW |
1513 | |
1514 | ret = -EINVAL; | |
1515 | goto close_and_fail; | |
1516 | } | |
b6ad491a | 1517 | |
b6ce07aa | 1518 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1519 | bdrv_dev_change_media_cb(bs, true); |
c3adb58f MA |
1520 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
1521 | && !runstate_check(RUN_STATE_INMIGRATE) | |
1522 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ | |
1523 | error_setg(errp, | |
1524 | "Guest must be stopped for opening of encrypted image"); | |
1525 | ret = -EBUSY; | |
1526 | goto close_and_fail; | |
b6ce07aa KW |
1527 | } |
1528 | ||
c3adb58f | 1529 | QDECREF(options); |
f67503e5 | 1530 | *pbs = bs; |
b6ce07aa KW |
1531 | return 0; |
1532 | ||
8bfea15d | 1533 | fail: |
f500a6d3 | 1534 | if (file != NULL) { |
4f6fd349 | 1535 | bdrv_unref(file); |
f500a6d3 | 1536 | } |
de9c0cec | 1537 | QDECREF(bs->options); |
b6ad491a | 1538 | QDECREF(options); |
de9c0cec | 1539 | bs->options = NULL; |
f67503e5 HR |
1540 | if (!*pbs) { |
1541 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1542 | needs to be freed now. Otherwise, it does not need to be closed, | |
1543 | since it has not really been opened yet. */ | |
1544 | bdrv_unref(bs); | |
1545 | } | |
84d18f06 | 1546 | if (local_err) { |
34b5d2c6 HR |
1547 | error_propagate(errp, local_err); |
1548 | } | |
b6ad491a | 1549 | return ret; |
de9c0cec | 1550 | |
b6ad491a | 1551 | close_and_fail: |
f67503e5 HR |
1552 | /* See fail path, but now the BDS has to be always closed */ |
1553 | if (*pbs) { | |
1554 | bdrv_close(bs); | |
1555 | } else { | |
1556 | bdrv_unref(bs); | |
1557 | } | |
b6ad491a | 1558 | QDECREF(options); |
84d18f06 | 1559 | if (local_err) { |
34b5d2c6 HR |
1560 | error_propagate(errp, local_err); |
1561 | } | |
b6ce07aa KW |
1562 | return ret; |
1563 | } | |
1564 | ||
e971aa12 JC |
1565 | typedef struct BlockReopenQueueEntry { |
1566 | bool prepared; | |
1567 | BDRVReopenState state; | |
1568 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1569 | } BlockReopenQueueEntry; | |
1570 | ||
1571 | /* | |
1572 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1573 | * reopen of multiple devices. | |
1574 | * | |
1575 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1576 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1577 | * be created and initialized. This newly created BlockReopenQueue should be | |
1578 | * passed back in for subsequent calls that are intended to be of the same | |
1579 | * atomic 'set'. | |
1580 | * | |
1581 | * bs is the BlockDriverState to add to the reopen queue. | |
1582 | * | |
1583 | * flags contains the open flags for the associated bs | |
1584 | * | |
1585 | * returns a pointer to bs_queue, which is either the newly allocated | |
1586 | * bs_queue, or the existing bs_queue being used. | |
1587 | * | |
1588 | */ | |
1589 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1590 | BlockDriverState *bs, int flags) | |
1591 | { | |
1592 | assert(bs != NULL); | |
1593 | ||
1594 | BlockReopenQueueEntry *bs_entry; | |
1595 | if (bs_queue == NULL) { | |
1596 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1597 | QSIMPLEQ_INIT(bs_queue); | |
1598 | } | |
1599 | ||
f1f25a2e KW |
1600 | /* bdrv_open() masks this flag out */ |
1601 | flags &= ~BDRV_O_PROTOCOL; | |
1602 | ||
e971aa12 | 1603 | if (bs->file) { |
f1f25a2e | 1604 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
e971aa12 JC |
1605 | } |
1606 | ||
1607 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1608 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1609 | ||
1610 | bs_entry->state.bs = bs; | |
1611 | bs_entry->state.flags = flags; | |
1612 | ||
1613 | return bs_queue; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1618 | * | |
1619 | * The queue passed in (bs_queue) must have been built up previous | |
1620 | * via bdrv_reopen_queue(). | |
1621 | * | |
1622 | * Reopens all BDS specified in the queue, with the appropriate | |
1623 | * flags. All devices are prepared for reopen, and failure of any | |
1624 | * device will cause all device changes to be abandonded, and intermediate | |
1625 | * data cleaned up. | |
1626 | * | |
1627 | * If all devices prepare successfully, then the changes are committed | |
1628 | * to all devices. | |
1629 | * | |
1630 | */ | |
1631 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1632 | { | |
1633 | int ret = -1; | |
1634 | BlockReopenQueueEntry *bs_entry, *next; | |
1635 | Error *local_err = NULL; | |
1636 | ||
1637 | assert(bs_queue != NULL); | |
1638 | ||
1639 | bdrv_drain_all(); | |
1640 | ||
1641 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1642 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1643 | error_propagate(errp, local_err); | |
1644 | goto cleanup; | |
1645 | } | |
1646 | bs_entry->prepared = true; | |
1647 | } | |
1648 | ||
1649 | /* If we reach this point, we have success and just need to apply the | |
1650 | * changes | |
1651 | */ | |
1652 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1653 | bdrv_reopen_commit(&bs_entry->state); | |
1654 | } | |
1655 | ||
1656 | ret = 0; | |
1657 | ||
1658 | cleanup: | |
1659 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1660 | if (ret && bs_entry->prepared) { | |
1661 | bdrv_reopen_abort(&bs_entry->state); | |
1662 | } | |
1663 | g_free(bs_entry); | |
1664 | } | |
1665 | g_free(bs_queue); | |
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | ||
1670 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1671 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1672 | { | |
1673 | int ret = -1; | |
1674 | Error *local_err = NULL; | |
1675 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1676 | ||
1677 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1678 | if (local_err != NULL) { | |
1679 | error_propagate(errp, local_err); | |
1680 | } | |
1681 | return ret; | |
1682 | } | |
1683 | ||
1684 | ||
1685 | /* | |
1686 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1687 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1688 | * the block driver layer .bdrv_reopen_prepare() | |
1689 | * | |
1690 | * bs is the BlockDriverState to reopen | |
1691 | * flags are the new open flags | |
1692 | * queue is the reopen queue | |
1693 | * | |
1694 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1695 | * as well. | |
1696 | * | |
1697 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1698 | * It is the responsibility of the caller to then call the abort() or | |
1699 | * commit() for any other BDS that have been left in a prepare() state | |
1700 | * | |
1701 | */ | |
1702 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1703 | Error **errp) | |
1704 | { | |
1705 | int ret = -1; | |
1706 | Error *local_err = NULL; | |
1707 | BlockDriver *drv; | |
1708 | ||
1709 | assert(reopen_state != NULL); | |
1710 | assert(reopen_state->bs->drv != NULL); | |
1711 | drv = reopen_state->bs->drv; | |
1712 | ||
1713 | /* if we are to stay read-only, do not allow permission change | |
1714 | * to r/w */ | |
1715 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1716 | reopen_state->flags & BDRV_O_RDWR) { | |
1717 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1718 | reopen_state->bs->device_name); | |
1719 | goto error; | |
1720 | } | |
1721 | ||
1722 | ||
1723 | ret = bdrv_flush(reopen_state->bs); | |
1724 | if (ret) { | |
1725 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1726 | strerror(-ret)); | |
1727 | goto error; | |
1728 | } | |
1729 | ||
1730 | if (drv->bdrv_reopen_prepare) { | |
1731 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1732 | if (ret) { | |
1733 | if (local_err != NULL) { | |
1734 | error_propagate(errp, local_err); | |
1735 | } else { | |
d8b6895f LC |
1736 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1737 | reopen_state->bs->filename); | |
e971aa12 JC |
1738 | } |
1739 | goto error; | |
1740 | } | |
1741 | } else { | |
1742 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1743 | * handler for each supported drv. */ | |
1744 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1745 | drv->format_name, reopen_state->bs->device_name, | |
1746 | "reopening of file"); | |
1747 | ret = -1; | |
1748 | goto error; | |
1749 | } | |
1750 | ||
1751 | ret = 0; | |
1752 | ||
1753 | error: | |
1754 | return ret; | |
1755 | } | |
1756 | ||
1757 | /* | |
1758 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1759 | * makes them final by swapping the staging BlockDriverState contents into | |
1760 | * the active BlockDriverState contents. | |
1761 | */ | |
1762 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1763 | { | |
1764 | BlockDriver *drv; | |
1765 | ||
1766 | assert(reopen_state != NULL); | |
1767 | drv = reopen_state->bs->drv; | |
1768 | assert(drv != NULL); | |
1769 | ||
1770 | /* If there are any driver level actions to take */ | |
1771 | if (drv->bdrv_reopen_commit) { | |
1772 | drv->bdrv_reopen_commit(reopen_state); | |
1773 | } | |
1774 | ||
1775 | /* set BDS specific flags now */ | |
1776 | reopen_state->bs->open_flags = reopen_state->flags; | |
1777 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1778 | BDRV_O_CACHE_WB); | |
1779 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac KW |
1780 | |
1781 | bdrv_refresh_limits(reopen_state->bs); | |
e971aa12 JC |
1782 | } |
1783 | ||
1784 | /* | |
1785 | * Abort the reopen, and delete and free the staged changes in | |
1786 | * reopen_state | |
1787 | */ | |
1788 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1789 | { | |
1790 | BlockDriver *drv; | |
1791 | ||
1792 | assert(reopen_state != NULL); | |
1793 | drv = reopen_state->bs->drv; | |
1794 | assert(drv != NULL); | |
1795 | ||
1796 | if (drv->bdrv_reopen_abort) { | |
1797 | drv->bdrv_reopen_abort(reopen_state); | |
1798 | } | |
1799 | } | |
1800 | ||
1801 | ||
fc01f7e7 FB |
1802 | void bdrv_close(BlockDriverState *bs) |
1803 | { | |
3cbc002c PB |
1804 | if (bs->job) { |
1805 | block_job_cancel_sync(bs->job); | |
1806 | } | |
58fda173 SH |
1807 | bdrv_drain_all(); /* complete I/O */ |
1808 | bdrv_flush(bs); | |
1809 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1810 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1811 | |
3cbc002c | 1812 | if (bs->drv) { |
557df6ac | 1813 | if (bs->backing_hd) { |
826b6ca0 FZ |
1814 | BlockDriverState *backing_hd = bs->backing_hd; |
1815 | bdrv_set_backing_hd(bs, NULL); | |
1816 | bdrv_unref(backing_hd); | |
557df6ac | 1817 | } |
ea2384d3 | 1818 | bs->drv->bdrv_close(bs); |
7267c094 | 1819 | g_free(bs->opaque); |
ea2384d3 FB |
1820 | bs->opaque = NULL; |
1821 | bs->drv = NULL; | |
53fec9d3 | 1822 | bs->copy_on_read = 0; |
a275fa42 PB |
1823 | bs->backing_file[0] = '\0'; |
1824 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1825 | bs->total_sectors = 0; |
1826 | bs->encrypted = 0; | |
1827 | bs->valid_key = 0; | |
1828 | bs->sg = 0; | |
1829 | bs->growable = 0; | |
0d51b4de | 1830 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1831 | QDECREF(bs->options); |
1832 | bs->options = NULL; | |
b338082b | 1833 | |
66f82cee | 1834 | if (bs->file != NULL) { |
4f6fd349 | 1835 | bdrv_unref(bs->file); |
0ac9377d | 1836 | bs->file = NULL; |
66f82cee | 1837 | } |
b338082b | 1838 | } |
98f90dba | 1839 | |
9ca11154 PH |
1840 | bdrv_dev_change_media_cb(bs, false); |
1841 | ||
98f90dba ZYW |
1842 | /*throttling disk I/O limits*/ |
1843 | if (bs->io_limits_enabled) { | |
1844 | bdrv_io_limits_disable(bs); | |
1845 | } | |
b338082b FB |
1846 | } |
1847 | ||
2bc93fed MK |
1848 | void bdrv_close_all(void) |
1849 | { | |
1850 | BlockDriverState *bs; | |
1851 | ||
dc364f4c | 1852 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
1853 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1854 | ||
1855 | aio_context_acquire(aio_context); | |
2bc93fed | 1856 | bdrv_close(bs); |
ed78cda3 | 1857 | aio_context_release(aio_context); |
2bc93fed MK |
1858 | } |
1859 | } | |
1860 | ||
88266f5a SH |
1861 | /* Check if any requests are in-flight (including throttled requests) */ |
1862 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1863 | { | |
1864 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1865 | return true; | |
1866 | } | |
cc0681c4 BC |
1867 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1868 | return true; | |
1869 | } | |
1870 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1871 | return true; |
1872 | } | |
1873 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1874 | return true; | |
1875 | } | |
1876 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1877 | return true; | |
1878 | } | |
1879 | return false; | |
1880 | } | |
1881 | ||
922453bc SH |
1882 | /* |
1883 | * Wait for pending requests to complete across all BlockDriverStates | |
1884 | * | |
1885 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1886 | * after calling this function. | |
4c355d53 ZYW |
1887 | * |
1888 | * Note that completion of an asynchronous I/O operation can trigger any | |
1889 | * number of other I/O operations on other devices---for example a coroutine | |
1890 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1891 | * coroutine is complete. Because of this, it is not possible to have a | |
1892 | * function to drain a single device's I/O queue. | |
922453bc SH |
1893 | */ |
1894 | void bdrv_drain_all(void) | |
1895 | { | |
88266f5a SH |
1896 | /* Always run first iteration so any pending completion BHs run */ |
1897 | bool busy = true; | |
922453bc SH |
1898 | BlockDriverState *bs; |
1899 | ||
88266f5a | 1900 | while (busy) { |
9b536adc SH |
1901 | busy = false; |
1902 | ||
dc364f4c | 1903 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
9b536adc SH |
1904 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1905 | bool bs_busy; | |
1906 | ||
1907 | aio_context_acquire(aio_context); | |
448ad91d | 1908 | bdrv_flush_io_queue(bs); |
0b06ef3b | 1909 | bdrv_start_throttled_reqs(bs); |
9b536adc SH |
1910 | bs_busy = bdrv_requests_pending(bs); |
1911 | bs_busy |= aio_poll(aio_context, bs_busy); | |
1912 | aio_context_release(aio_context); | |
922453bc | 1913 | |
9b536adc SH |
1914 | busy |= bs_busy; |
1915 | } | |
922453bc SH |
1916 | } |
1917 | } | |
1918 | ||
dc364f4c BC |
1919 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
1920 | * graph_bdrv_state list. | |
d22b2f41 RH |
1921 | Also, NULL terminate the device_name to prevent double remove */ |
1922 | void bdrv_make_anon(BlockDriverState *bs) | |
1923 | { | |
1924 | if (bs->device_name[0] != '\0') { | |
dc364f4c | 1925 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
d22b2f41 RH |
1926 | } |
1927 | bs->device_name[0] = '\0'; | |
dc364f4c BC |
1928 | if (bs->node_name[0] != '\0') { |
1929 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
1930 | } | |
1931 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
1932 | } |
1933 | ||
e023b2e2 PB |
1934 | static void bdrv_rebind(BlockDriverState *bs) |
1935 | { | |
1936 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1937 | bs->drv->bdrv_rebind(bs); | |
1938 | } | |
1939 | } | |
1940 | ||
4ddc07ca PB |
1941 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1942 | BlockDriverState *bs_src) | |
8802d1fd | 1943 | { |
4ddc07ca | 1944 | /* move some fields that need to stay attached to the device */ |
8802d1fd JC |
1945 | |
1946 | /* dev info */ | |
4ddc07ca PB |
1947 | bs_dest->dev_ops = bs_src->dev_ops; |
1948 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1949 | bs_dest->dev = bs_src->dev; | |
1b7fd729 | 1950 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 1951 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 1952 | |
4ddc07ca | 1953 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1954 | |
cc0681c4 BC |
1955 | /* i/o throttled req */ |
1956 | memcpy(&bs_dest->throttle_state, | |
1957 | &bs_src->throttle_state, | |
1958 | sizeof(ThrottleState)); | |
1959 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1960 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1961 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1962 | |
8802d1fd | 1963 | /* r/w error */ |
4ddc07ca PB |
1964 | bs_dest->on_read_error = bs_src->on_read_error; |
1965 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1966 | |
1967 | /* i/o status */ | |
4ddc07ca PB |
1968 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1969 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1970 | |
a9fc4408 | 1971 | /* dirty bitmap */ |
e4654d2d | 1972 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 1973 | |
9fcb0251 FZ |
1974 | /* reference count */ |
1975 | bs_dest->refcnt = bs_src->refcnt; | |
1976 | ||
a9fc4408 | 1977 | /* job */ |
4ddc07ca | 1978 | bs_dest->job = bs_src->job; |
a9fc4408 | 1979 | |
8802d1fd | 1980 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1981 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1982 | bs_src->device_name); | |
dc364f4c | 1983 | bs_dest->device_list = bs_src->device_list; |
fbe40ff7 FZ |
1984 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
1985 | sizeof(bs_dest->op_blockers)); | |
4ddc07ca | 1986 | } |
8802d1fd | 1987 | |
4ddc07ca PB |
1988 | /* |
1989 | * Swap bs contents for two image chains while they are live, | |
1990 | * while keeping required fields on the BlockDriverState that is | |
1991 | * actually attached to a device. | |
1992 | * | |
1993 | * This will modify the BlockDriverState fields, and swap contents | |
1994 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1995 | * | |
1996 | * bs_new is required to be anonymous. | |
1997 | * | |
1998 | * This function does not create any image files. | |
1999 | */ | |
2000 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
2001 | { | |
2002 | BlockDriverState tmp; | |
f6801b83 | 2003 | |
90ce8a06 BC |
2004 | /* The code needs to swap the node_name but simply swapping node_list won't |
2005 | * work so first remove the nodes from the graph list, do the swap then | |
2006 | * insert them back if needed. | |
2007 | */ | |
2008 | if (bs_new->node_name[0] != '\0') { | |
2009 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); | |
2010 | } | |
2011 | if (bs_old->node_name[0] != '\0') { | |
2012 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); | |
2013 | } | |
2014 | ||
4ddc07ca PB |
2015 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
2016 | assert(bs_new->device_name[0] == '\0'); | |
e4654d2d | 2017 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
2018 | assert(bs_new->job == NULL); |
2019 | assert(bs_new->dev == NULL); | |
4ddc07ca | 2020 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2021 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 2022 | |
4ddc07ca PB |
2023 | tmp = *bs_new; |
2024 | *bs_new = *bs_old; | |
2025 | *bs_old = tmp; | |
a9fc4408 | 2026 | |
4ddc07ca PB |
2027 | /* there are some fields that should not be swapped, move them back */ |
2028 | bdrv_move_feature_fields(&tmp, bs_old); | |
2029 | bdrv_move_feature_fields(bs_old, bs_new); | |
2030 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 2031 | |
4ddc07ca PB |
2032 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
2033 | assert(bs_new->device_name[0] == '\0'); | |
2034 | ||
2035 | /* Check a few fields that should remain attached to the device */ | |
2036 | assert(bs_new->dev == NULL); | |
2037 | assert(bs_new->job == NULL); | |
4ddc07ca | 2038 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2039 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 | 2040 | |
90ce8a06 BC |
2041 | /* insert the nodes back into the graph node list if needed */ |
2042 | if (bs_new->node_name[0] != '\0') { | |
2043 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); | |
2044 | } | |
2045 | if (bs_old->node_name[0] != '\0') { | |
2046 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); | |
2047 | } | |
2048 | ||
e023b2e2 | 2049 | bdrv_rebind(bs_new); |
4ddc07ca PB |
2050 | bdrv_rebind(bs_old); |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * Add new bs contents at the top of an image chain while the chain is | |
2055 | * live, while keeping required fields on the top layer. | |
2056 | * | |
2057 | * This will modify the BlockDriverState fields, and swap contents | |
2058 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
2059 | * | |
2060 | * bs_new is required to be anonymous. | |
2061 | * | |
2062 | * This function does not create any image files. | |
2063 | */ | |
2064 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
2065 | { | |
2066 | bdrv_swap(bs_new, bs_top); | |
2067 | ||
2068 | /* The contents of 'tmp' will become bs_top, as we are | |
2069 | * swapping bs_new and bs_top contents. */ | |
8d24cce1 | 2070 | bdrv_set_backing_hd(bs_top, bs_new); |
8802d1fd JC |
2071 | } |
2072 | ||
4f6fd349 | 2073 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 2074 | { |
fa879d62 | 2075 | assert(!bs->dev); |
3e914655 | 2076 | assert(!bs->job); |
3718d8ab | 2077 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 2078 | assert(!bs->refcnt); |
e4654d2d | 2079 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 2080 | |
e1b5c52e SH |
2081 | bdrv_close(bs); |
2082 | ||
1b7bdbc1 | 2083 | /* remove from list, if necessary */ |
d22b2f41 | 2084 | bdrv_make_anon(bs); |
34c6f050 | 2085 | |
7267c094 | 2086 | g_free(bs); |
fc01f7e7 FB |
2087 | } |
2088 | ||
fa879d62 MA |
2089 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
2090 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 2091 | { |
fa879d62 | 2092 | if (bs->dev) { |
18846dee MA |
2093 | return -EBUSY; |
2094 | } | |
fa879d62 | 2095 | bs->dev = dev; |
28a7282a | 2096 | bdrv_iostatus_reset(bs); |
18846dee MA |
2097 | return 0; |
2098 | } | |
2099 | ||
fa879d62 MA |
2100 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
2101 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 2102 | { |
fa879d62 MA |
2103 | if (bdrv_attach_dev(bs, dev) < 0) { |
2104 | abort(); | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
2109 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
2110 | { | |
2111 | assert(bs->dev == dev); | |
2112 | bs->dev = NULL; | |
0e49de52 MA |
2113 | bs->dev_ops = NULL; |
2114 | bs->dev_opaque = NULL; | |
1b7fd729 | 2115 | bs->guest_block_size = 512; |
18846dee MA |
2116 | } |
2117 | ||
fa879d62 MA |
2118 | /* TODO change to return DeviceState * when all users are qdevified */ |
2119 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 2120 | { |
fa879d62 | 2121 | return bs->dev; |
18846dee MA |
2122 | } |
2123 | ||
0e49de52 MA |
2124 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
2125 | void *opaque) | |
2126 | { | |
2127 | bs->dev_ops = ops; | |
2128 | bs->dev_opaque = opaque; | |
2129 | } | |
2130 | ||
7d4b4ba5 | 2131 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 2132 | { |
145feb17 | 2133 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 2134 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 2135 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
2136 | if (tray_was_closed) { |
2137 | /* tray open */ | |
a5ee7bd4 WX |
2138 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
2139 | true, &error_abort); | |
6f382ed2 LC |
2140 | } |
2141 | if (load) { | |
2142 | /* tray close */ | |
a5ee7bd4 WX |
2143 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
2144 | false, &error_abort); | |
6f382ed2 | 2145 | } |
145feb17 MA |
2146 | } |
2147 | } | |
2148 | ||
2c6942fa MA |
2149 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
2150 | { | |
2151 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
2152 | } | |
2153 | ||
025ccaa7 PB |
2154 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
2155 | { | |
2156 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
2157 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
2158 | } | |
2159 | } | |
2160 | ||
e4def80b MA |
2161 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
2162 | { | |
2163 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
2164 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
2165 | } | |
2166 | return false; | |
2167 | } | |
2168 | ||
145feb17 MA |
2169 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
2170 | { | |
2171 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
2172 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
2173 | } |
2174 | } | |
2175 | ||
f107639a MA |
2176 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
2177 | { | |
2178 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
2179 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
2180 | } | |
2181 | return false; | |
2182 | } | |
2183 | ||
e97fc193 AL |
2184 | /* |
2185 | * Run consistency checks on an image | |
2186 | * | |
e076f338 | 2187 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2188 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2189 | * check are stored in res. |
e97fc193 | 2190 | */ |
4534ff54 | 2191 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
2192 | { |
2193 | if (bs->drv->bdrv_check == NULL) { | |
2194 | return -ENOTSUP; | |
2195 | } | |
2196 | ||
e076f338 | 2197 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2198 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2199 | } |
2200 | ||
8a426614 KW |
2201 | #define COMMIT_BUF_SECTORS 2048 |
2202 | ||
33e3963e FB |
2203 | /* commit COW file into the raw image */ |
2204 | int bdrv_commit(BlockDriverState *bs) | |
2205 | { | |
19cb3738 | 2206 | BlockDriver *drv = bs->drv; |
72706ea4 | 2207 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2208 | int n, ro, open_flags; |
0bce597d | 2209 | int ret = 0; |
72706ea4 | 2210 | uint8_t *buf = NULL; |
c2cba3d9 | 2211 | char filename[PATH_MAX]; |
33e3963e | 2212 | |
19cb3738 FB |
2213 | if (!drv) |
2214 | return -ENOMEDIUM; | |
4dca4b63 NS |
2215 | |
2216 | if (!bs->backing_hd) { | |
2217 | return -ENOTSUP; | |
33e3963e FB |
2218 | } |
2219 | ||
3718d8ab FZ |
2220 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) || |
2221 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) { | |
2d3735d3 SH |
2222 | return -EBUSY; |
2223 | } | |
2224 | ||
4dca4b63 | 2225 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2226 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2227 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2228 | open_flags = bs->backing_hd->open_flags; |
2229 | ||
2230 | if (ro) { | |
0bce597d JC |
2231 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2232 | return -EACCES; | |
4dca4b63 | 2233 | } |
ea2384d3 | 2234 | } |
33e3963e | 2235 | |
72706ea4 JC |
2236 | length = bdrv_getlength(bs); |
2237 | if (length < 0) { | |
2238 | ret = length; | |
2239 | goto ro_cleanup; | |
2240 | } | |
2241 | ||
2242 | backing_length = bdrv_getlength(bs->backing_hd); | |
2243 | if (backing_length < 0) { | |
2244 | ret = backing_length; | |
2245 | goto ro_cleanup; | |
2246 | } | |
2247 | ||
2248 | /* If our top snapshot is larger than the backing file image, | |
2249 | * grow the backing file image if possible. If not possible, | |
2250 | * we must return an error */ | |
2251 | if (length > backing_length) { | |
2252 | ret = bdrv_truncate(bs->backing_hd, length); | |
2253 | if (ret < 0) { | |
2254 | goto ro_cleanup; | |
2255 | } | |
2256 | } | |
2257 | ||
2258 | total_sectors = length >> BDRV_SECTOR_BITS; | |
7267c094 | 2259 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
2260 | |
2261 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2262 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2263 | if (ret < 0) { | |
2264 | goto ro_cleanup; | |
2265 | } | |
2266 | if (ret) { | |
dabfa6cc KW |
2267 | ret = bdrv_read(bs, sector, buf, n); |
2268 | if (ret < 0) { | |
8a426614 KW |
2269 | goto ro_cleanup; |
2270 | } | |
2271 | ||
dabfa6cc KW |
2272 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2273 | if (ret < 0) { | |
8a426614 KW |
2274 | goto ro_cleanup; |
2275 | } | |
ea2384d3 | 2276 | } |
33e3963e | 2277 | } |
95389c86 | 2278 | |
1d44952f CH |
2279 | if (drv->bdrv_make_empty) { |
2280 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2281 | if (ret < 0) { |
2282 | goto ro_cleanup; | |
2283 | } | |
1d44952f CH |
2284 | bdrv_flush(bs); |
2285 | } | |
95389c86 | 2286 | |
3f5075ae CH |
2287 | /* |
2288 | * Make sure all data we wrote to the backing device is actually | |
2289 | * stable on disk. | |
2290 | */ | |
dabfa6cc | 2291 | if (bs->backing_hd) { |
3f5075ae | 2292 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2293 | } |
4dca4b63 | 2294 | |
dabfa6cc | 2295 | ret = 0; |
4dca4b63 | 2296 | ro_cleanup: |
7267c094 | 2297 | g_free(buf); |
4dca4b63 NS |
2298 | |
2299 | if (ro) { | |
0bce597d JC |
2300 | /* ignoring error return here */ |
2301 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2302 | } |
2303 | ||
1d44952f | 2304 | return ret; |
33e3963e FB |
2305 | } |
2306 | ||
e8877497 | 2307 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2308 | { |
2309 | BlockDriverState *bs; | |
2310 | ||
dc364f4c | 2311 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
2312 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2313 | ||
2314 | aio_context_acquire(aio_context); | |
272d2d8e JC |
2315 | if (bs->drv && bs->backing_hd) { |
2316 | int ret = bdrv_commit(bs); | |
2317 | if (ret < 0) { | |
ed78cda3 | 2318 | aio_context_release(aio_context); |
272d2d8e JC |
2319 | return ret; |
2320 | } | |
e8877497 | 2321 | } |
ed78cda3 | 2322 | aio_context_release(aio_context); |
6ab4b5ab | 2323 | } |
e8877497 | 2324 | return 0; |
6ab4b5ab MA |
2325 | } |
2326 | ||
dbffbdcf SH |
2327 | /** |
2328 | * Remove an active request from the tracked requests list | |
2329 | * | |
2330 | * This function should be called when a tracked request is completing. | |
2331 | */ | |
2332 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2333 | { | |
2dbafdc0 KW |
2334 | if (req->serialising) { |
2335 | req->bs->serialising_in_flight--; | |
2336 | } | |
2337 | ||
dbffbdcf | 2338 | QLIST_REMOVE(req, list); |
f4658285 | 2339 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2340 | } |
2341 | ||
2342 | /** | |
2343 | * Add an active request to the tracked requests list | |
2344 | */ | |
2345 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2346 | BlockDriverState *bs, | |
793ed47a KW |
2347 | int64_t offset, |
2348 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2349 | { |
2350 | *req = (BdrvTrackedRequest){ | |
2351 | .bs = bs, | |
2dbafdc0 KW |
2352 | .offset = offset, |
2353 | .bytes = bytes, | |
2354 | .is_write = is_write, | |
2355 | .co = qemu_coroutine_self(), | |
2356 | .serialising = false, | |
7327145f KW |
2357 | .overlap_offset = offset, |
2358 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2359 | }; |
2360 | ||
f4658285 SH |
2361 | qemu_co_queue_init(&req->wait_queue); |
2362 | ||
dbffbdcf SH |
2363 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2364 | } | |
2365 | ||
e96126ff | 2366 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2367 | { |
7327145f | 2368 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2369 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2370 | - overlap_offset; | |
7327145f | 2371 | |
2dbafdc0 KW |
2372 | if (!req->serialising) { |
2373 | req->bs->serialising_in_flight++; | |
2374 | req->serialising = true; | |
2375 | } | |
7327145f KW |
2376 | |
2377 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2378 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2379 | } |
2380 | ||
d83947ac SH |
2381 | /** |
2382 | * Round a region to cluster boundaries | |
2383 | */ | |
343bded4 PB |
2384 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2385 | int64_t sector_num, int nb_sectors, | |
2386 | int64_t *cluster_sector_num, | |
2387 | int *cluster_nb_sectors) | |
d83947ac SH |
2388 | { |
2389 | BlockDriverInfo bdi; | |
2390 | ||
2391 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2392 | *cluster_sector_num = sector_num; | |
2393 | *cluster_nb_sectors = nb_sectors; | |
2394 | } else { | |
2395 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2396 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2397 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2398 | nb_sectors, c); | |
2399 | } | |
2400 | } | |
2401 | ||
7327145f | 2402 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2403 | { |
2404 | BlockDriverInfo bdi; | |
7327145f | 2405 | int ret; |
793ed47a | 2406 | |
7327145f KW |
2407 | ret = bdrv_get_info(bs, &bdi); |
2408 | if (ret < 0 || bdi.cluster_size == 0) { | |
2409 | return bs->request_alignment; | |
793ed47a | 2410 | } else { |
7327145f | 2411 | return bdi.cluster_size; |
793ed47a KW |
2412 | } |
2413 | } | |
2414 | ||
f4658285 | 2415 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2416 | int64_t offset, unsigned int bytes) |
2417 | { | |
d83947ac | 2418 | /* aaaa bbbb */ |
7327145f | 2419 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2420 | return false; |
2421 | } | |
2422 | /* bbbb aaaa */ | |
7327145f | 2423 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2424 | return false; |
2425 | } | |
2426 | return true; | |
f4658285 SH |
2427 | } |
2428 | ||
28de2dcd | 2429 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2430 | { |
2dbafdc0 | 2431 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2432 | BdrvTrackedRequest *req; |
2433 | bool retry; | |
28de2dcd | 2434 | bool waited = false; |
f4658285 | 2435 | |
2dbafdc0 | 2436 | if (!bs->serialising_in_flight) { |
28de2dcd | 2437 | return false; |
2dbafdc0 KW |
2438 | } |
2439 | ||
f4658285 SH |
2440 | do { |
2441 | retry = false; | |
2442 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2443 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2444 | continue; |
2445 | } | |
7327145f KW |
2446 | if (tracked_request_overlaps(req, self->overlap_offset, |
2447 | self->overlap_bytes)) | |
2448 | { | |
5f8b6491 SH |
2449 | /* Hitting this means there was a reentrant request, for |
2450 | * example, a block driver issuing nested requests. This must | |
2451 | * never happen since it means deadlock. | |
2452 | */ | |
2453 | assert(qemu_coroutine_self() != req->co); | |
2454 | ||
6460440f KW |
2455 | /* If the request is already (indirectly) waiting for us, or |
2456 | * will wait for us as soon as it wakes up, then just go on | |
2457 | * (instead of producing a deadlock in the former case). */ | |
2458 | if (!req->waiting_for) { | |
2459 | self->waiting_for = req; | |
2460 | qemu_co_queue_wait(&req->wait_queue); | |
2461 | self->waiting_for = NULL; | |
2462 | retry = true; | |
28de2dcd | 2463 | waited = true; |
6460440f KW |
2464 | break; |
2465 | } | |
f4658285 SH |
2466 | } |
2467 | } | |
2468 | } while (retry); | |
28de2dcd KW |
2469 | |
2470 | return waited; | |
f4658285 SH |
2471 | } |
2472 | ||
756e6736 KW |
2473 | /* |
2474 | * Return values: | |
2475 | * 0 - success | |
2476 | * -EINVAL - backing format specified, but no file | |
2477 | * -ENOSPC - can't update the backing file because no space is left in the | |
2478 | * image file header | |
2479 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2480 | */ | |
2481 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2482 | const char *backing_file, const char *backing_fmt) | |
2483 | { | |
2484 | BlockDriver *drv = bs->drv; | |
469ef350 | 2485 | int ret; |
756e6736 | 2486 | |
5f377794 PB |
2487 | /* Backing file format doesn't make sense without a backing file */ |
2488 | if (backing_fmt && !backing_file) { | |
2489 | return -EINVAL; | |
2490 | } | |
2491 | ||
756e6736 | 2492 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2493 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2494 | } else { |
469ef350 | 2495 | ret = -ENOTSUP; |
756e6736 | 2496 | } |
469ef350 PB |
2497 | |
2498 | if (ret == 0) { | |
2499 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2500 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2501 | } | |
2502 | return ret; | |
756e6736 KW |
2503 | } |
2504 | ||
6ebdcee2 JC |
2505 | /* |
2506 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2507 | * | |
2508 | * active is the current topmost image. | |
2509 | * | |
2510 | * Returns NULL if bs is not found in active's image chain, | |
2511 | * or if active == bs. | |
4caf0fcd JC |
2512 | * |
2513 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
2514 | */ |
2515 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2516 | BlockDriverState *bs) | |
2517 | { | |
4caf0fcd JC |
2518 | while (active && bs != active->backing_hd) { |
2519 | active = active->backing_hd; | |
6ebdcee2 JC |
2520 | } |
2521 | ||
4caf0fcd JC |
2522 | return active; |
2523 | } | |
6ebdcee2 | 2524 | |
4caf0fcd JC |
2525 | /* Given a BDS, searches for the base layer. */ |
2526 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
2527 | { | |
2528 | return bdrv_find_overlay(bs, NULL); | |
6ebdcee2 JC |
2529 | } |
2530 | ||
2531 | typedef struct BlkIntermediateStates { | |
2532 | BlockDriverState *bs; | |
2533 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2534 | } BlkIntermediateStates; | |
2535 | ||
2536 | ||
2537 | /* | |
2538 | * Drops images above 'base' up to and including 'top', and sets the image | |
2539 | * above 'top' to have base as its backing file. | |
2540 | * | |
2541 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2542 | * information in 'bs' can be properly updated. | |
2543 | * | |
2544 | * E.g., this will convert the following chain: | |
2545 | * bottom <- base <- intermediate <- top <- active | |
2546 | * | |
2547 | * to | |
2548 | * | |
2549 | * bottom <- base <- active | |
2550 | * | |
2551 | * It is allowed for bottom==base, in which case it converts: | |
2552 | * | |
2553 | * base <- intermediate <- top <- active | |
2554 | * | |
2555 | * to | |
2556 | * | |
2557 | * base <- active | |
2558 | * | |
54e26900 JC |
2559 | * If backing_file_str is non-NULL, it will be used when modifying top's |
2560 | * overlay image metadata. | |
2561 | * | |
6ebdcee2 JC |
2562 | * Error conditions: |
2563 | * if active == top, that is considered an error | |
2564 | * | |
2565 | */ | |
2566 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
54e26900 | 2567 | BlockDriverState *base, const char *backing_file_str) |
6ebdcee2 JC |
2568 | { |
2569 | BlockDriverState *intermediate; | |
2570 | BlockDriverState *base_bs = NULL; | |
2571 | BlockDriverState *new_top_bs = NULL; | |
2572 | BlkIntermediateStates *intermediate_state, *next; | |
2573 | int ret = -EIO; | |
2574 | ||
2575 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2576 | QSIMPLEQ_INIT(&states_to_delete); | |
2577 | ||
2578 | if (!top->drv || !base->drv) { | |
2579 | goto exit; | |
2580 | } | |
2581 | ||
2582 | new_top_bs = bdrv_find_overlay(active, top); | |
2583 | ||
2584 | if (new_top_bs == NULL) { | |
2585 | /* we could not find the image above 'top', this is an error */ | |
2586 | goto exit; | |
2587 | } | |
2588 | ||
2589 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2590 | * to do, no intermediate images */ | |
2591 | if (new_top_bs->backing_hd == base) { | |
2592 | ret = 0; | |
2593 | goto exit; | |
2594 | } | |
2595 | ||
2596 | intermediate = top; | |
2597 | ||
2598 | /* now we will go down through the list, and add each BDS we find | |
2599 | * into our deletion queue, until we hit the 'base' | |
2600 | */ | |
2601 | while (intermediate) { | |
2602 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2603 | intermediate_state->bs = intermediate; | |
2604 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2605 | ||
2606 | if (intermediate->backing_hd == base) { | |
2607 | base_bs = intermediate->backing_hd; | |
2608 | break; | |
2609 | } | |
2610 | intermediate = intermediate->backing_hd; | |
2611 | } | |
2612 | if (base_bs == NULL) { | |
2613 | /* something went wrong, we did not end at the base. safely | |
2614 | * unravel everything, and exit with error */ | |
2615 | goto exit; | |
2616 | } | |
2617 | ||
2618 | /* success - we can delete the intermediate states, and link top->base */ | |
54e26900 JC |
2619 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
2620 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, | |
6ebdcee2 JC |
2621 | base_bs->drv ? base_bs->drv->format_name : ""); |
2622 | if (ret) { | |
2623 | goto exit; | |
2624 | } | |
920beae1 | 2625 | bdrv_set_backing_hd(new_top_bs, base_bs); |
6ebdcee2 JC |
2626 | |
2627 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2628 | /* so that bdrv_close() does not recursively close the chain */ | |
920beae1 | 2629 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
4f6fd349 | 2630 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2631 | } |
2632 | ret = 0; | |
2633 | ||
2634 | exit: | |
2635 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2636 | g_free(intermediate_state); | |
2637 | } | |
2638 | return ret; | |
2639 | } | |
2640 | ||
2641 | ||
71d0770c AL |
2642 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2643 | size_t size) | |
2644 | { | |
2645 | int64_t len; | |
2646 | ||
1dd3a447 KW |
2647 | if (size > INT_MAX) { |
2648 | return -EIO; | |
2649 | } | |
2650 | ||
71d0770c AL |
2651 | if (!bdrv_is_inserted(bs)) |
2652 | return -ENOMEDIUM; | |
2653 | ||
2654 | if (bs->growable) | |
2655 | return 0; | |
2656 | ||
2657 | len = bdrv_getlength(bs); | |
2658 | ||
fbb7b4e0 KW |
2659 | if (offset < 0) |
2660 | return -EIO; | |
2661 | ||
2662 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2663 | return -EIO; |
2664 | ||
2665 | return 0; | |
2666 | } | |
2667 | ||
2668 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2669 | int nb_sectors) | |
2670 | { | |
54db38a4 | 2671 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
8f4754ed KW |
2672 | return -EIO; |
2673 | } | |
2674 | ||
eb5a3165 JS |
2675 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2676 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2677 | } |
2678 | ||
1c9805a3 SH |
2679 | typedef struct RwCo { |
2680 | BlockDriverState *bs; | |
775aa8b6 | 2681 | int64_t offset; |
1c9805a3 SH |
2682 | QEMUIOVector *qiov; |
2683 | bool is_write; | |
2684 | int ret; | |
4105eaaa | 2685 | BdrvRequestFlags flags; |
1c9805a3 SH |
2686 | } RwCo; |
2687 | ||
2688 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2689 | { |
1c9805a3 | 2690 | RwCo *rwco = opaque; |
ea2384d3 | 2691 | |
1c9805a3 | 2692 | if (!rwco->is_write) { |
775aa8b6 KW |
2693 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2694 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2695 | rwco->flags); |
775aa8b6 KW |
2696 | } else { |
2697 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2698 | rwco->qiov->size, rwco->qiov, | |
2699 | rwco->flags); | |
1c9805a3 SH |
2700 | } |
2701 | } | |
e7a8a783 | 2702 | |
1c9805a3 | 2703 | /* |
8d3b1a2d | 2704 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2705 | */ |
775aa8b6 KW |
2706 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2707 | QEMUIOVector *qiov, bool is_write, | |
2708 | BdrvRequestFlags flags) | |
1c9805a3 | 2709 | { |
1c9805a3 SH |
2710 | Coroutine *co; |
2711 | RwCo rwco = { | |
2712 | .bs = bs, | |
775aa8b6 | 2713 | .offset = offset, |
8d3b1a2d | 2714 | .qiov = qiov, |
1c9805a3 SH |
2715 | .is_write = is_write, |
2716 | .ret = NOT_DONE, | |
4105eaaa | 2717 | .flags = flags, |
1c9805a3 | 2718 | }; |
e7a8a783 | 2719 | |
498e386c ZYW |
2720 | /** |
2721 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2722 | * will not fire; so the I/O throttling function has to be disabled here | |
2723 | * if it has been enabled. | |
2724 | */ | |
2725 | if (bs->io_limits_enabled) { | |
2726 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2727 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2728 | bdrv_io_limits_disable(bs); | |
2729 | } | |
2730 | ||
1c9805a3 SH |
2731 | if (qemu_in_coroutine()) { |
2732 | /* Fast-path if already in coroutine context */ | |
2733 | bdrv_rw_co_entry(&rwco); | |
2734 | } else { | |
2572b37a SH |
2735 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2736 | ||
1c9805a3 SH |
2737 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
2738 | qemu_coroutine_enter(co, &rwco); | |
2739 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 2740 | aio_poll(aio_context, true); |
1c9805a3 SH |
2741 | } |
2742 | } | |
2743 | return rwco.ret; | |
2744 | } | |
b338082b | 2745 | |
8d3b1a2d KW |
2746 | /* |
2747 | * Process a synchronous request using coroutines | |
2748 | */ | |
2749 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2750 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2751 | { |
2752 | QEMUIOVector qiov; | |
2753 | struct iovec iov = { | |
2754 | .iov_base = (void *)buf, | |
2755 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2756 | }; | |
2757 | ||
da15ee51 KW |
2758 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
2759 | return -EINVAL; | |
2760 | } | |
2761 | ||
8d3b1a2d | 2762 | qemu_iovec_init_external(&qiov, &iov, 1); |
775aa8b6 KW |
2763 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2764 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2765 | } |
2766 | ||
1c9805a3 SH |
2767 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2768 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2769 | uint8_t *buf, int nb_sectors) | |
2770 | { | |
4105eaaa | 2771 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2772 | } |
2773 | ||
07d27a44 MA |
2774 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2775 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2776 | uint8_t *buf, int nb_sectors) | |
2777 | { | |
2778 | bool enabled; | |
2779 | int ret; | |
2780 | ||
2781 | enabled = bs->io_limits_enabled; | |
2782 | bs->io_limits_enabled = false; | |
4e7395e8 | 2783 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2784 | bs->io_limits_enabled = enabled; |
2785 | return ret; | |
2786 | } | |
2787 | ||
5fafdf24 | 2788 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2789 | -EIO generic I/O error (may happen for all errors) |
2790 | -ENOMEDIUM No media inserted. | |
2791 | -EINVAL Invalid sector number or nb_sectors | |
2792 | -EACCES Trying to write a read-only device | |
2793 | */ | |
5fafdf24 | 2794 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2795 | const uint8_t *buf, int nb_sectors) |
2796 | { | |
4105eaaa | 2797 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2798 | } |
2799 | ||
aa7bfbff PL |
2800 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2801 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2802 | { |
2803 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2804 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2805 | } |
2806 | ||
d75cbb5e PL |
2807 | /* |
2808 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2809 | * The operation is sped up by checking the block status and only writing | |
2810 | * zeroes to the device if they currently do not return zeroes. Optional | |
2811 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2812 | * | |
2813 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2814 | */ | |
2815 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2816 | { | |
9ce10c0b | 2817 | int64_t target_size; |
d75cbb5e PL |
2818 | int64_t ret, nb_sectors, sector_num = 0; |
2819 | int n; | |
2820 | ||
9ce10c0b KW |
2821 | target_size = bdrv_getlength(bs); |
2822 | if (target_size < 0) { | |
2823 | return target_size; | |
2824 | } | |
2825 | target_size /= BDRV_SECTOR_SIZE; | |
2826 | ||
d75cbb5e PL |
2827 | for (;;) { |
2828 | nb_sectors = target_size - sector_num; | |
2829 | if (nb_sectors <= 0) { | |
2830 | return 0; | |
2831 | } | |
2832 | if (nb_sectors > INT_MAX) { | |
2833 | nb_sectors = INT_MAX; | |
2834 | } | |
2835 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2836 | if (ret < 0) { |
2837 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2838 | sector_num, strerror(-ret)); | |
2839 | return ret; | |
2840 | } | |
d75cbb5e PL |
2841 | if (ret & BDRV_BLOCK_ZERO) { |
2842 | sector_num += n; | |
2843 | continue; | |
2844 | } | |
2845 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2846 | if (ret < 0) { | |
2847 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2848 | sector_num, strerror(-ret)); | |
2849 | return ret; | |
2850 | } | |
2851 | sector_num += n; | |
2852 | } | |
2853 | } | |
2854 | ||
a3ef6571 | 2855 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2856 | { |
a3ef6571 KW |
2857 | QEMUIOVector qiov; |
2858 | struct iovec iov = { | |
2859 | .iov_base = (void *)buf, | |
2860 | .iov_len = bytes, | |
2861 | }; | |
9a8c4cce | 2862 | int ret; |
83f64091 | 2863 | |
a3ef6571 KW |
2864 | if (bytes < 0) { |
2865 | return -EINVAL; | |
83f64091 FB |
2866 | } |
2867 | ||
a3ef6571 KW |
2868 | qemu_iovec_init_external(&qiov, &iov, 1); |
2869 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2870 | if (ret < 0) { | |
2871 | return ret; | |
83f64091 | 2872 | } |
a3ef6571 KW |
2873 | |
2874 | return bytes; | |
83f64091 FB |
2875 | } |
2876 | ||
8d3b1a2d | 2877 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2878 | { |
9a8c4cce | 2879 | int ret; |
83f64091 | 2880 | |
8407d5d7 KW |
2881 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2882 | if (ret < 0) { | |
2883 | return ret; | |
83f64091 FB |
2884 | } |
2885 | ||
8d3b1a2d KW |
2886 | return qiov->size; |
2887 | } | |
2888 | ||
2889 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2890 | const void *buf, int bytes) |
8d3b1a2d KW |
2891 | { |
2892 | QEMUIOVector qiov; | |
2893 | struct iovec iov = { | |
2894 | .iov_base = (void *) buf, | |
8407d5d7 | 2895 | .iov_len = bytes, |
8d3b1a2d KW |
2896 | }; |
2897 | ||
8407d5d7 KW |
2898 | if (bytes < 0) { |
2899 | return -EINVAL; | |
2900 | } | |
2901 | ||
8d3b1a2d KW |
2902 | qemu_iovec_init_external(&qiov, &iov, 1); |
2903 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2904 | } |
83f64091 | 2905 | |
f08145fe KW |
2906 | /* |
2907 | * Writes to the file and ensures that no writes are reordered across this | |
2908 | * request (acts as a barrier) | |
2909 | * | |
2910 | * Returns 0 on success, -errno in error cases. | |
2911 | */ | |
2912 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2913 | const void *buf, int count) | |
2914 | { | |
2915 | int ret; | |
2916 | ||
2917 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2918 | if (ret < 0) { | |
2919 | return ret; | |
2920 | } | |
2921 | ||
f05fa4ad PB |
2922 | /* No flush needed for cache modes that already do it */ |
2923 | if (bs->enable_write_cache) { | |
f08145fe KW |
2924 | bdrv_flush(bs); |
2925 | } | |
2926 | ||
2927 | return 0; | |
2928 | } | |
2929 | ||
470c0504 | 2930 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2931 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2932 | { | |
2933 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2934 | * their read buffer while the operation is in progress do not end up | |
2935 | * modifying the image file. This is critical for zero-copy guest I/O | |
2936 | * where anything might happen inside guest memory. | |
2937 | */ | |
2938 | void *bounce_buffer; | |
2939 | ||
79c053bd | 2940 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2941 | struct iovec iov; |
2942 | QEMUIOVector bounce_qiov; | |
2943 | int64_t cluster_sector_num; | |
2944 | int cluster_nb_sectors; | |
2945 | size_t skip_bytes; | |
2946 | int ret; | |
2947 | ||
2948 | /* Cover entire cluster so no additional backing file I/O is required when | |
2949 | * allocating cluster in the image file. | |
2950 | */ | |
343bded4 PB |
2951 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2952 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2953 | |
470c0504 SH |
2954 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2955 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2956 | |
2957 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2958 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2959 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2960 | ||
79c053bd SH |
2961 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2962 | &bounce_qiov); | |
ab185921 SH |
2963 | if (ret < 0) { |
2964 | goto err; | |
2965 | } | |
2966 | ||
79c053bd SH |
2967 | if (drv->bdrv_co_write_zeroes && |
2968 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 2969 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 2970 | cluster_nb_sectors, 0); |
79c053bd | 2971 | } else { |
f05fa4ad PB |
2972 | /* This does not change the data on the disk, it is not necessary |
2973 | * to flush even in cache=writethrough mode. | |
2974 | */ | |
79c053bd | 2975 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2976 | &bounce_qiov); |
79c053bd SH |
2977 | } |
2978 | ||
ab185921 SH |
2979 | if (ret < 0) { |
2980 | /* It might be okay to ignore write errors for guest requests. If this | |
2981 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2982 | * Simply report it in all cases. | |
2983 | */ | |
2984 | goto err; | |
2985 | } | |
2986 | ||
2987 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2988 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2989 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2990 | |
2991 | err: | |
2992 | qemu_vfree(bounce_buffer); | |
2993 | return ret; | |
2994 | } | |
2995 | ||
c5fbe571 | 2996 | /* |
d0c7f642 KW |
2997 | * Forwards an already correctly aligned request to the BlockDriver. This |
2998 | * handles copy on read and zeroing after EOF; any other features must be | |
2999 | * implemented by the caller. | |
c5fbe571 | 3000 | */ |
d0c7f642 | 3001 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 3002 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 3003 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
3004 | { |
3005 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3006 | int ret; |
da1fa91d | 3007 | |
d0c7f642 KW |
3008 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3009 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 3010 | |
d0c7f642 KW |
3011 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3012 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
3013 | ||
3014 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 3015 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
3016 | /* If we touch the same cluster it counts as an overlap. This |
3017 | * guarantees that allocating writes will be serialized and not race | |
3018 | * with each other for the same cluster. For example, in copy-on-read | |
3019 | * it ensures that the CoR read and write operations are atomic and | |
3020 | * guest writes cannot interleave between them. */ | |
3021 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
3022 | } |
3023 | ||
2dbafdc0 | 3024 | wait_serialising_requests(req); |
f4658285 | 3025 | |
470c0504 | 3026 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
3027 | int pnum; |
3028 | ||
bdad13b9 | 3029 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
3030 | if (ret < 0) { |
3031 | goto out; | |
3032 | } | |
3033 | ||
3034 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 3035 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
3036 | goto out; |
3037 | } | |
3038 | } | |
3039 | ||
d0c7f642 | 3040 | /* Forward the request to the BlockDriver */ |
893a8f62 MK |
3041 | if (!(bs->zero_beyond_eof && bs->growable)) { |
3042 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
3043 | } else { | |
3044 | /* Read zeros after EOF of growable BDSes */ | |
3045 | int64_t len, total_sectors, max_nb_sectors; | |
3046 | ||
3047 | len = bdrv_getlength(bs); | |
3048 | if (len < 0) { | |
3049 | ret = len; | |
3050 | goto out; | |
3051 | } | |
3052 | ||
d055a1fe | 3053 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
5f5bcd80 KW |
3054 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
3055 | align >> BDRV_SECTOR_BITS); | |
893a8f62 | 3056 | if (max_nb_sectors > 0) { |
33f461e0 KW |
3057 | QEMUIOVector local_qiov; |
3058 | size_t local_sectors; | |
3059 | ||
3060 | max_nb_sectors = MIN(max_nb_sectors, SIZE_MAX / BDRV_SECTOR_BITS); | |
3061 | local_sectors = MIN(max_nb_sectors, nb_sectors); | |
3062 | ||
3063 | qemu_iovec_init(&local_qiov, qiov->niov); | |
3064 | qemu_iovec_concat(&local_qiov, qiov, 0, | |
3065 | local_sectors * BDRV_SECTOR_SIZE); | |
3066 | ||
3067 | ret = drv->bdrv_co_readv(bs, sector_num, local_sectors, | |
3068 | &local_qiov); | |
3069 | ||
3070 | qemu_iovec_destroy(&local_qiov); | |
893a8f62 MK |
3071 | } else { |
3072 | ret = 0; | |
3073 | } | |
3074 | ||
3075 | /* Reading beyond end of file is supposed to produce zeroes */ | |
3076 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
3077 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
3078 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
3079 | BDRV_SECTOR_SIZE; | |
3080 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
3081 | } | |
3082 | } | |
ab185921 SH |
3083 | |
3084 | out: | |
dbffbdcf | 3085 | return ret; |
da1fa91d KW |
3086 | } |
3087 | ||
d0c7f642 KW |
3088 | /* |
3089 | * Handle a read request in coroutine context | |
3090 | */ | |
1b0288ae KW |
3091 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
3092 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
3093 | BdrvRequestFlags flags) |
3094 | { | |
3095 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
3096 | BdrvTrackedRequest req; |
3097 | ||
1b0288ae KW |
3098 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3099 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3100 | uint8_t *head_buf = NULL; | |
3101 | uint8_t *tail_buf = NULL; | |
3102 | QEMUIOVector local_qiov; | |
3103 | bool use_local_qiov = false; | |
d0c7f642 KW |
3104 | int ret; |
3105 | ||
3106 | if (!drv) { | |
3107 | return -ENOMEDIUM; | |
3108 | } | |
1b0288ae | 3109 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
d0c7f642 KW |
3110 | return -EIO; |
3111 | } | |
3112 | ||
3113 | if (bs->copy_on_read) { | |
3114 | flags |= BDRV_REQ_COPY_ON_READ; | |
3115 | } | |
3116 | ||
3117 | /* throttling disk I/O */ | |
3118 | if (bs->io_limits_enabled) { | |
d5103588 | 3119 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3120 | } |
3121 | ||
3122 | /* Align read if necessary by padding qiov */ | |
3123 | if (offset & (align - 1)) { | |
3124 | head_buf = qemu_blockalign(bs, align); | |
3125 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3126 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3127 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3128 | use_local_qiov = true; | |
3129 | ||
3130 | bytes += offset & (align - 1); | |
3131 | offset = offset & ~(align - 1); | |
3132 | } | |
3133 | ||
3134 | if ((offset + bytes) & (align - 1)) { | |
3135 | if (!use_local_qiov) { | |
3136 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3137 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3138 | use_local_qiov = true; | |
3139 | } | |
3140 | tail_buf = qemu_blockalign(bs, align); | |
3141 | qemu_iovec_add(&local_qiov, tail_buf, | |
3142 | align - ((offset + bytes) & (align - 1))); | |
3143 | ||
3144 | bytes = ROUND_UP(bytes, align); | |
3145 | } | |
3146 | ||
65afd211 | 3147 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3148 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3149 | use_local_qiov ? &local_qiov : qiov, |
3150 | flags); | |
65afd211 | 3151 | tracked_request_end(&req); |
1b0288ae KW |
3152 | |
3153 | if (use_local_qiov) { | |
3154 | qemu_iovec_destroy(&local_qiov); | |
3155 | qemu_vfree(head_buf); | |
3156 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3157 | } |
3158 | ||
d0c7f642 KW |
3159 | return ret; |
3160 | } | |
3161 | ||
1b0288ae KW |
3162 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3163 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3164 | BdrvRequestFlags flags) | |
3165 | { | |
3166 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { | |
3167 | return -EINVAL; | |
3168 | } | |
3169 | ||
3170 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3171 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3172 | } | |
3173 | ||
c5fbe571 | 3174 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3175 | int nb_sectors, QEMUIOVector *qiov) |
3176 | { | |
c5fbe571 | 3177 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3178 | |
470c0504 SH |
3179 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3180 | } | |
3181 | ||
3182 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3183 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3184 | { | |
3185 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3186 | ||
3187 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3188 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3189 | } |
3190 | ||
c31cb707 PL |
3191 | /* if no limit is specified in the BlockLimits use a default |
3192 | * of 32768 512-byte sectors (16 MiB) per request. | |
3193 | */ | |
3194 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
3195 | ||
f08f2dda | 3196 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3197 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3198 | { |
3199 | BlockDriver *drv = bs->drv; | |
3200 | QEMUIOVector qiov; | |
c31cb707 PL |
3201 | struct iovec iov = {0}; |
3202 | int ret = 0; | |
f08f2dda | 3203 | |
c31cb707 PL |
3204 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
3205 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 3206 | |
c31cb707 PL |
3207 | while (nb_sectors > 0 && !ret) { |
3208 | int num = nb_sectors; | |
3209 | ||
b8d71c09 PB |
3210 | /* Align request. Block drivers can expect the "bulk" of the request |
3211 | * to be aligned. | |
3212 | */ | |
3213 | if (bs->bl.write_zeroes_alignment | |
3214 | && num > bs->bl.write_zeroes_alignment) { | |
3215 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3216 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3217 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3218 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3219 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3220 | /* Shorten the request to the last aligned sector. num cannot | |
3221 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3222 | */ | |
3223 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3224 | } |
621f0589 | 3225 | } |
f08f2dda | 3226 | |
c31cb707 PL |
3227 | /* limit request size */ |
3228 | if (num > max_write_zeroes) { | |
3229 | num = max_write_zeroes; | |
3230 | } | |
3231 | ||
3232 | ret = -ENOTSUP; | |
3233 | /* First try the efficient write zeroes operation */ | |
3234 | if (drv->bdrv_co_write_zeroes) { | |
3235 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3236 | } | |
3237 | ||
3238 | if (ret == -ENOTSUP) { | |
3239 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
3240 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
3241 | if (iov.iov_base == NULL) { | |
b8d71c09 PB |
3242 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3243 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); | |
c31cb707 PL |
3244 | } |
3245 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3246 | |
c31cb707 | 3247 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3248 | |
3249 | /* Keep bounce buffer around if it is big enough for all | |
3250 | * all future requests. | |
3251 | */ | |
3252 | if (num < max_write_zeroes) { | |
3253 | qemu_vfree(iov.iov_base); | |
3254 | iov.iov_base = NULL; | |
3255 | } | |
c31cb707 PL |
3256 | } |
3257 | ||
3258 | sector_num += num; | |
3259 | nb_sectors -= num; | |
3260 | } | |
f08f2dda SH |
3261 | |
3262 | qemu_vfree(iov.iov_base); | |
3263 | return ret; | |
3264 | } | |
3265 | ||
c5fbe571 | 3266 | /* |
b404f720 | 3267 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3268 | */ |
b404f720 | 3269 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3270 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3271 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3272 | { |
3273 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3274 | bool waited; |
6b7cb247 | 3275 | int ret; |
da1fa91d | 3276 | |
b404f720 KW |
3277 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3278 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3279 | |
b404f720 KW |
3280 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3281 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
cc0681c4 | 3282 | |
28de2dcd KW |
3283 | waited = wait_serialising_requests(req); |
3284 | assert(!waited || !req->serialising); | |
af91f9a7 KW |
3285 | assert(req->overlap_offset <= offset); |
3286 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); | |
244eadef | 3287 | |
65afd211 | 3288 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
d616b224 | 3289 | |
465bee1d PL |
3290 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
3291 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && | |
3292 | qemu_iovec_is_zero(qiov)) { | |
3293 | flags |= BDRV_REQ_ZERO_WRITE; | |
3294 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { | |
3295 | flags |= BDRV_REQ_MAY_UNMAP; | |
3296 | } | |
3297 | } | |
3298 | ||
d616b224 SH |
3299 | if (ret < 0) { |
3300 | /* Do nothing, write notifier decided to fail this request */ | |
3301 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
9e1cb96d | 3302 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
aa7bfbff | 3303 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3304 | } else { |
9e1cb96d | 3305 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
f08f2dda SH |
3306 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
3307 | } | |
9e1cb96d | 3308 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
6b7cb247 | 3309 | |
f05fa4ad PB |
3310 | if (ret == 0 && !bs->enable_write_cache) { |
3311 | ret = bdrv_co_flush(bs); | |
3312 | } | |
3313 | ||
e4654d2d | 3314 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
3315 | |
3316 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
3317 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
3318 | } | |
df2a6f29 PB |
3319 | if (bs->growable && ret >= 0) { |
3320 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
3321 | } | |
da1fa91d | 3322 | |
6b7cb247 | 3323 | return ret; |
da1fa91d KW |
3324 | } |
3325 | ||
b404f720 KW |
3326 | /* |
3327 | * Handle a write request in coroutine context | |
3328 | */ | |
6601553e KW |
3329 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3330 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3331 | BdrvRequestFlags flags) |
3332 | { | |
65afd211 | 3333 | BdrvTrackedRequest req; |
3b8242e0 KW |
3334 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3335 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3336 | uint8_t *head_buf = NULL; | |
3337 | uint8_t *tail_buf = NULL; | |
3338 | QEMUIOVector local_qiov; | |
3339 | bool use_local_qiov = false; | |
b404f720 KW |
3340 | int ret; |
3341 | ||
3342 | if (!bs->drv) { | |
3343 | return -ENOMEDIUM; | |
3344 | } | |
3345 | if (bs->read_only) { | |
3346 | return -EACCES; | |
3347 | } | |
6601553e | 3348 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
b404f720 KW |
3349 | return -EIO; |
3350 | } | |
3351 | ||
b404f720 KW |
3352 | /* throttling disk I/O */ |
3353 | if (bs->io_limits_enabled) { | |
d5103588 | 3354 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3355 | } |
3356 | ||
3b8242e0 KW |
3357 | /* |
3358 | * Align write if necessary by performing a read-modify-write cycle. | |
3359 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3360 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3361 | */ | |
65afd211 | 3362 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3363 | |
3364 | if (offset & (align - 1)) { | |
3365 | QEMUIOVector head_qiov; | |
3366 | struct iovec head_iov; | |
3367 | ||
3368 | mark_request_serialising(&req, align); | |
3369 | wait_serialising_requests(&req); | |
3370 | ||
3371 | head_buf = qemu_blockalign(bs, align); | |
3372 | head_iov = (struct iovec) { | |
3373 | .iov_base = head_buf, | |
3374 | .iov_len = align, | |
3375 | }; | |
3376 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3377 | ||
9e1cb96d | 3378 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3379 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3380 | align, &head_qiov, 0); | |
3381 | if (ret < 0) { | |
3382 | goto fail; | |
3383 | } | |
9e1cb96d | 3384 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3385 | |
3386 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3387 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3388 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3389 | use_local_qiov = true; | |
3390 | ||
3391 | bytes += offset & (align - 1); | |
3392 | offset = offset & ~(align - 1); | |
3393 | } | |
3394 | ||
3395 | if ((offset + bytes) & (align - 1)) { | |
3396 | QEMUIOVector tail_qiov; | |
3397 | struct iovec tail_iov; | |
3398 | size_t tail_bytes; | |
28de2dcd | 3399 | bool waited; |
3b8242e0 KW |
3400 | |
3401 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3402 | waited = wait_serialising_requests(&req); |
3403 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3404 | |
3405 | tail_buf = qemu_blockalign(bs, align); | |
3406 | tail_iov = (struct iovec) { | |
3407 | .iov_base = tail_buf, | |
3408 | .iov_len = align, | |
3409 | }; | |
3410 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3411 | ||
9e1cb96d | 3412 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3413 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3414 | align, &tail_qiov, 0); | |
3415 | if (ret < 0) { | |
3416 | goto fail; | |
3417 | } | |
9e1cb96d | 3418 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3419 | |
3420 | if (!use_local_qiov) { | |
3421 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3422 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3423 | use_local_qiov = true; | |
3424 | } | |
3425 | ||
3426 | tail_bytes = (offset + bytes) & (align - 1); | |
3427 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3428 | ||
3429 | bytes = ROUND_UP(bytes, align); | |
3430 | } | |
3431 | ||
3432 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, | |
3433 | use_local_qiov ? &local_qiov : qiov, | |
3434 | flags); | |
3435 | ||
3436 | fail: | |
65afd211 | 3437 | tracked_request_end(&req); |
b404f720 | 3438 | |
3b8242e0 KW |
3439 | if (use_local_qiov) { |
3440 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3441 | } |
99c4a85c KW |
3442 | qemu_vfree(head_buf); |
3443 | qemu_vfree(tail_buf); | |
3b8242e0 | 3444 | |
b404f720 KW |
3445 | return ret; |
3446 | } | |
3447 | ||
6601553e KW |
3448 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3449 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3450 | BdrvRequestFlags flags) | |
3451 | { | |
3452 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { | |
3453 | return -EINVAL; | |
3454 | } | |
3455 | ||
3456 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3457 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3458 | } | |
3459 | ||
c5fbe571 SH |
3460 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3461 | int nb_sectors, QEMUIOVector *qiov) | |
3462 | { | |
3463 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3464 | ||
f08f2dda SH |
3465 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3466 | } | |
3467 | ||
3468 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3469 | int64_t sector_num, int nb_sectors, |
3470 | BdrvRequestFlags flags) | |
f08f2dda | 3471 | { |
94d6ff21 | 3472 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3473 | |
d32f35cb PL |
3474 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3475 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3476 | } | |
3477 | ||
f08f2dda | 3478 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3479 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3480 | } |
3481 | ||
83f64091 FB |
3482 | /** |
3483 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3484 | */ | |
3485 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3486 | { | |
3487 | BlockDriver *drv = bs->drv; | |
51762288 | 3488 | int ret; |
83f64091 | 3489 | if (!drv) |
19cb3738 | 3490 | return -ENOMEDIUM; |
83f64091 FB |
3491 | if (!drv->bdrv_truncate) |
3492 | return -ENOTSUP; | |
59f2689d NS |
3493 | if (bs->read_only) |
3494 | return -EACCES; | |
9c75e168 | 3495 | |
51762288 SH |
3496 | ret = drv->bdrv_truncate(bs, offset); |
3497 | if (ret == 0) { | |
3498 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3499 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3500 | } |
3501 | return ret; | |
83f64091 FB |
3502 | } |
3503 | ||
4a1d5e1f FZ |
3504 | /** |
3505 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3506 | * allocated space. Return < 0 if error or unknown. | |
3507 | */ | |
3508 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3509 | { | |
3510 | BlockDriver *drv = bs->drv; | |
3511 | if (!drv) { | |
3512 | return -ENOMEDIUM; | |
3513 | } | |
3514 | if (drv->bdrv_get_allocated_file_size) { | |
3515 | return drv->bdrv_get_allocated_file_size(bs); | |
3516 | } | |
3517 | if (bs->file) { | |
3518 | return bdrv_get_allocated_file_size(bs->file); | |
3519 | } | |
3520 | return -ENOTSUP; | |
3521 | } | |
3522 | ||
83f64091 FB |
3523 | /** |
3524 | * Length of a file in bytes. Return < 0 if error or unknown. | |
3525 | */ | |
3526 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3527 | { | |
3528 | BlockDriver *drv = bs->drv; | |
3529 | if (!drv) | |
19cb3738 | 3530 | return -ENOMEDIUM; |
51762288 | 3531 | |
b94a2610 KW |
3532 | if (drv->has_variable_length) { |
3533 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3534 | if (ret < 0) { | |
3535 | return ret; | |
46a4e4e6 | 3536 | } |
83f64091 | 3537 | } |
46a4e4e6 | 3538 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3539 | } |
3540 | ||
19cb3738 | 3541 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3542 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3543 | { |
19cb3738 FB |
3544 | int64_t length; |
3545 | length = bdrv_getlength(bs); | |
3546 | if (length < 0) | |
3547 | length = 0; | |
3548 | else | |
6ea44308 | 3549 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 3550 | *nb_sectors_ptr = length; |
fc01f7e7 | 3551 | } |
cf98951b | 3552 | |
ff06f5f3 PB |
3553 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3554 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3555 | { |
3556 | bs->on_read_error = on_read_error; | |
3557 | bs->on_write_error = on_write_error; | |
3558 | } | |
3559 | ||
1ceee0d5 | 3560 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3561 | { |
3562 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3563 | } | |
3564 | ||
3e1caa5f PB |
3565 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3566 | { | |
3567 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3568 | ||
3569 | switch (on_err) { | |
3570 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
3571 | return (error == ENOSPC) ? |
3572 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
3e1caa5f | 3573 | case BLOCKDEV_ON_ERROR_STOP: |
a589569f | 3574 | return BLOCK_ERROR_ACTION_STOP; |
3e1caa5f | 3575 | case BLOCKDEV_ON_ERROR_REPORT: |
a589569f | 3576 | return BLOCK_ERROR_ACTION_REPORT; |
3e1caa5f | 3577 | case BLOCKDEV_ON_ERROR_IGNORE: |
a589569f | 3578 | return BLOCK_ERROR_ACTION_IGNORE; |
3e1caa5f PB |
3579 | default: |
3580 | abort(); | |
3581 | } | |
3582 | } | |
3583 | ||
3584 | /* This is done by device models because, while the block layer knows | |
3585 | * about the error, it does not know whether an operation comes from | |
3586 | * the device or the block layer (from a job, for example). | |
3587 | */ | |
3588 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3589 | bool is_read, int error) | |
3590 | { | |
3591 | assert(error >= 0); | |
2bd3bce8 | 3592 | |
a589569f | 3593 | if (action == BLOCK_ERROR_ACTION_STOP) { |
2bd3bce8 PB |
3594 | /* First set the iostatus, so that "info block" returns an iostatus |
3595 | * that matches the events raised so far (an additional error iostatus | |
3596 | * is fine, but not a lost one). | |
3597 | */ | |
3e1caa5f | 3598 | bdrv_iostatus_set_err(bs, error); |
2bd3bce8 PB |
3599 | |
3600 | /* Then raise the request to stop the VM and the event. | |
3601 | * qemu_system_vmstop_request_prepare has two effects. First, | |
3602 | * it ensures that the STOP event always comes after the | |
3603 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
3604 | * can observe the STOP event and do a "cont" before the STOP | |
3605 | * event is issued, the VM will not stop. In this case, vm_start() | |
3606 | * also ensures that the STOP/RESUME pair of events is emitted. | |
3607 | */ | |
3608 | qemu_system_vmstop_request_prepare(); | |
5a2d2cbd WX |
3609 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), |
3610 | is_read ? IO_OPERATION_TYPE_READ : | |
3611 | IO_OPERATION_TYPE_WRITE, | |
3612 | action, &error_abort); | |
2bd3bce8 PB |
3613 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
3614 | } else { | |
5a2d2cbd WX |
3615 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), |
3616 | is_read ? IO_OPERATION_TYPE_READ : | |
3617 | IO_OPERATION_TYPE_WRITE, | |
3618 | action, &error_abort); | |
3e1caa5f PB |
3619 | } |
3620 | } | |
3621 | ||
b338082b FB |
3622 | int bdrv_is_read_only(BlockDriverState *bs) |
3623 | { | |
3624 | return bs->read_only; | |
3625 | } | |
3626 | ||
985a03b0 TS |
3627 | int bdrv_is_sg(BlockDriverState *bs) |
3628 | { | |
3629 | return bs->sg; | |
3630 | } | |
3631 | ||
e900a7b7 CH |
3632 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3633 | { | |
3634 | return bs->enable_write_cache; | |
3635 | } | |
3636 | ||
425b0148 PB |
3637 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3638 | { | |
3639 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3640 | |
3641 | /* so a reopen() will preserve wce */ | |
3642 | if (wce) { | |
3643 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3644 | } else { | |
3645 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3646 | } | |
425b0148 PB |
3647 | } |
3648 | ||
ea2384d3 FB |
3649 | int bdrv_is_encrypted(BlockDriverState *bs) |
3650 | { | |
3651 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3652 | return 1; | |
3653 | return bs->encrypted; | |
3654 | } | |
3655 | ||
c0f4ce77 AL |
3656 | int bdrv_key_required(BlockDriverState *bs) |
3657 | { | |
3658 | BlockDriverState *backing_hd = bs->backing_hd; | |
3659 | ||
3660 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3661 | return 1; | |
3662 | return (bs->encrypted && !bs->valid_key); | |
3663 | } | |
3664 | ||
ea2384d3 FB |
3665 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3666 | { | |
3667 | int ret; | |
3668 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3669 | ret = bdrv_set_key(bs->backing_hd, key); | |
3670 | if (ret < 0) | |
3671 | return ret; | |
3672 | if (!bs->encrypted) | |
3673 | return 0; | |
3674 | } | |
fd04a2ae SH |
3675 | if (!bs->encrypted) { |
3676 | return -EINVAL; | |
3677 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3678 | return -ENOMEDIUM; | |
3679 | } | |
c0f4ce77 | 3680 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3681 | if (ret < 0) { |
3682 | bs->valid_key = 0; | |
3683 | } else if (!bs->valid_key) { | |
3684 | bs->valid_key = 1; | |
3685 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3686 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3687 | } |
c0f4ce77 | 3688 | return ret; |
ea2384d3 FB |
3689 | } |
3690 | ||
f8d6bba1 | 3691 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3692 | { |
f8d6bba1 | 3693 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3694 | } |
3695 | ||
5fafdf24 | 3696 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3697 | void *opaque) |
3698 | { | |
3699 | BlockDriver *drv; | |
e855e4fb JC |
3700 | int count = 0; |
3701 | const char **formats = NULL; | |
ea2384d3 | 3702 | |
8a22f02a | 3703 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
e855e4fb JC |
3704 | if (drv->format_name) { |
3705 | bool found = false; | |
3706 | int i = count; | |
3707 | while (formats && i && !found) { | |
3708 | found = !strcmp(formats[--i], drv->format_name); | |
3709 | } | |
3710 | ||
3711 | if (!found) { | |
3712 | formats = g_realloc(formats, (count + 1) * sizeof(char *)); | |
3713 | formats[count++] = drv->format_name; | |
3714 | it(opaque, drv->format_name); | |
3715 | } | |
3716 | } | |
ea2384d3 | 3717 | } |
e855e4fb | 3718 | g_free(formats); |
ea2384d3 FB |
3719 | } |
3720 | ||
dc364f4c | 3721 | /* This function is to find block backend bs */ |
b338082b FB |
3722 | BlockDriverState *bdrv_find(const char *name) |
3723 | { | |
3724 | BlockDriverState *bs; | |
3725 | ||
dc364f4c | 3726 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
1b7bdbc1 | 3727 | if (!strcmp(name, bs->device_name)) { |
b338082b | 3728 | return bs; |
1b7bdbc1 | 3729 | } |
b338082b FB |
3730 | } |
3731 | return NULL; | |
3732 | } | |
3733 | ||
dc364f4c BC |
3734 | /* This function is to find a node in the bs graph */ |
3735 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3736 | { | |
3737 | BlockDriverState *bs; | |
3738 | ||
3739 | assert(node_name); | |
3740 | ||
3741 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3742 | if (!strcmp(node_name, bs->node_name)) { | |
3743 | return bs; | |
3744 | } | |
3745 | } | |
3746 | return NULL; | |
3747 | } | |
3748 | ||
c13163fb BC |
3749 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3750 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3751 | { | |
3752 | BlockDeviceInfoList *list, *entry; | |
3753 | BlockDriverState *bs; | |
3754 | ||
3755 | list = NULL; | |
3756 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3757 | entry = g_malloc0(sizeof(*entry)); | |
3758 | entry->value = bdrv_block_device_info(bs); | |
3759 | entry->next = list; | |
3760 | list = entry; | |
3761 | } | |
3762 | ||
3763 | return list; | |
3764 | } | |
3765 | ||
12d3ba82 BC |
3766 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3767 | const char *node_name, | |
3768 | Error **errp) | |
3769 | { | |
3770 | BlockDriverState *bs = NULL; | |
3771 | ||
12d3ba82 BC |
3772 | if (device) { |
3773 | bs = bdrv_find(device); | |
3774 | ||
dd67fa50 BC |
3775 | if (bs) { |
3776 | return bs; | |
12d3ba82 | 3777 | } |
12d3ba82 BC |
3778 | } |
3779 | ||
dd67fa50 BC |
3780 | if (node_name) { |
3781 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3782 | |
dd67fa50 BC |
3783 | if (bs) { |
3784 | return bs; | |
3785 | } | |
12d3ba82 BC |
3786 | } |
3787 | ||
dd67fa50 BC |
3788 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3789 | device ? device : "", | |
3790 | node_name ? node_name : ""); | |
3791 | return NULL; | |
12d3ba82 BC |
3792 | } |
3793 | ||
5a6684d2 JC |
3794 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
3795 | * return false. If either argument is NULL, return false. */ | |
3796 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
3797 | { | |
3798 | while (top && top != base) { | |
3799 | top = top->backing_hd; | |
3800 | } | |
3801 | ||
3802 | return top != NULL; | |
3803 | } | |
3804 | ||
2f399b0a MA |
3805 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3806 | { | |
3807 | if (!bs) { | |
3808 | return QTAILQ_FIRST(&bdrv_states); | |
3809 | } | |
dc364f4c | 3810 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3811 | } |
3812 | ||
51de9760 | 3813 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3814 | { |
3815 | BlockDriverState *bs; | |
3816 | ||
dc364f4c | 3817 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
51de9760 | 3818 | it(opaque, bs); |
81d0912d FB |
3819 | } |
3820 | } | |
3821 | ||
ea2384d3 FB |
3822 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3823 | { | |
3824 | return bs->device_name; | |
3825 | } | |
3826 | ||
c8433287 MA |
3827 | int bdrv_get_flags(BlockDriverState *bs) |
3828 | { | |
3829 | return bs->open_flags; | |
3830 | } | |
3831 | ||
f0f0fdfe | 3832 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3833 | { |
3834 | BlockDriverState *bs; | |
f0f0fdfe | 3835 | int result = 0; |
c6ca28d6 | 3836 | |
dc364f4c | 3837 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
3838 | AioContext *aio_context = bdrv_get_aio_context(bs); |
3839 | int ret; | |
3840 | ||
3841 | aio_context_acquire(aio_context); | |
3842 | ret = bdrv_flush(bs); | |
f0f0fdfe KW |
3843 | if (ret < 0 && !result) { |
3844 | result = ret; | |
3845 | } | |
ed78cda3 | 3846 | aio_context_release(aio_context); |
1b7bdbc1 | 3847 | } |
f0f0fdfe KW |
3848 | |
3849 | return result; | |
c6ca28d6 AL |
3850 | } |
3851 | ||
3ac21627 PL |
3852 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3853 | { | |
3854 | return 1; | |
3855 | } | |
3856 | ||
f2feebbd KW |
3857 | int bdrv_has_zero_init(BlockDriverState *bs) |
3858 | { | |
3859 | assert(bs->drv); | |
3860 | ||
11212d8f PB |
3861 | /* If BS is a copy on write image, it is initialized to |
3862 | the contents of the base image, which may not be zeroes. */ | |
3863 | if (bs->backing_hd) { | |
3864 | return 0; | |
3865 | } | |
336c1c12 KW |
3866 | if (bs->drv->bdrv_has_zero_init) { |
3867 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3868 | } |
3869 | ||
3ac21627 PL |
3870 | /* safe default */ |
3871 | return 0; | |
f2feebbd KW |
3872 | } |
3873 | ||
4ce78691 PL |
3874 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3875 | { | |
3876 | BlockDriverInfo bdi; | |
3877 | ||
3878 | if (bs->backing_hd) { | |
3879 | return false; | |
3880 | } | |
3881 | ||
3882 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3883 | return bdi.unallocated_blocks_are_zero; | |
3884 | } | |
3885 | ||
3886 | return false; | |
3887 | } | |
3888 | ||
3889 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3890 | { | |
3891 | BlockDriverInfo bdi; | |
3892 | ||
3893 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3894 | return false; | |
3895 | } | |
3896 | ||
3897 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3898 | return bdi.can_write_zeroes_with_unmap; | |
3899 | } | |
3900 | ||
3901 | return false; | |
3902 | } | |
3903 | ||
b6b8a333 | 3904 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3905 | BlockDriverState *bs; |
b35b2bba | 3906 | BlockDriverState *base; |
376ae3f1 SH |
3907 | int64_t sector_num; |
3908 | int nb_sectors; | |
3909 | int *pnum; | |
b6b8a333 | 3910 | int64_t ret; |
376ae3f1 | 3911 | bool done; |
b6b8a333 | 3912 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3913 | |
f58c7b35 TS |
3914 | /* |
3915 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3916 | * not implementing the functionality are assumed to not support backing files, | |
3917 | * hence all their sectors are reported as allocated. | |
3918 | * | |
bd9533e3 SH |
3919 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3920 | * and 'pnum' is set to 0. | |
3921 | * | |
f58c7b35 TS |
3922 | * 'pnum' is set to the number of sectors (including and immediately following |
3923 | * the specified sector) that are known to be in the same | |
3924 | * allocated/unallocated state. | |
3925 | * | |
bd9533e3 SH |
3926 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3927 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3928 | */ |
b6b8a333 PB |
3929 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3930 | int64_t sector_num, | |
3931 | int nb_sectors, int *pnum) | |
f58c7b35 | 3932 | { |
617ccb46 | 3933 | int64_t length; |
bd9533e3 | 3934 | int64_t n; |
5daa74a6 | 3935 | int64_t ret, ret2; |
bd9533e3 | 3936 | |
617ccb46 PB |
3937 | length = bdrv_getlength(bs); |
3938 | if (length < 0) { | |
3939 | return length; | |
3940 | } | |
3941 | ||
3942 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3943 | *pnum = 0; |
3944 | return 0; | |
3945 | } | |
3946 | ||
3947 | n = bs->total_sectors - sector_num; | |
3948 | if (n < nb_sectors) { | |
3949 | nb_sectors = n; | |
3950 | } | |
3951 | ||
b6b8a333 | 3952 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3953 | *pnum = nb_sectors; |
e88ae226 | 3954 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
918e92d7 PB |
3955 | if (bs->drv->protocol_name) { |
3956 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3957 | } | |
3958 | return ret; | |
f58c7b35 | 3959 | } |
6aebab14 | 3960 | |
415b5b01 PB |
3961 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3962 | if (ret < 0) { | |
3e0a233d | 3963 | *pnum = 0; |
415b5b01 PB |
3964 | return ret; |
3965 | } | |
3966 | ||
92bc50a5 PL |
3967 | if (ret & BDRV_BLOCK_RAW) { |
3968 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
3969 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3970 | *pnum, pnum); | |
3971 | } | |
3972 | ||
e88ae226 KW |
3973 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
3974 | ret |= BDRV_BLOCK_ALLOCATED; | |
3975 | } | |
3976 | ||
c3d86884 PL |
3977 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
3978 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 3979 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 3980 | } else if (bs->backing_hd) { |
f0ad5712 PB |
3981 | BlockDriverState *bs2 = bs->backing_hd; |
3982 | int64_t length2 = bdrv_getlength(bs2); | |
3983 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3984 | ret |= BDRV_BLOCK_ZERO; | |
3985 | } | |
3986 | } | |
415b5b01 | 3987 | } |
5daa74a6 PB |
3988 | |
3989 | if (bs->file && | |
3990 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3991 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3992 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3993 | *pnum, pnum); | |
3994 | if (ret2 >= 0) { | |
3995 | /* Ignore errors. This is just providing extra information, it | |
3996 | * is useful but not necessary. | |
3997 | */ | |
3998 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3999 | } | |
4000 | } | |
4001 | ||
415b5b01 | 4002 | return ret; |
060f51c9 SH |
4003 | } |
4004 | ||
b6b8a333 PB |
4005 | /* Coroutine wrapper for bdrv_get_block_status() */ |
4006 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 4007 | { |
b6b8a333 | 4008 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
4009 | BlockDriverState *bs = data->bs; |
4010 | ||
b6b8a333 PB |
4011 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
4012 | data->pnum); | |
060f51c9 SH |
4013 | data->done = true; |
4014 | } | |
4015 | ||
4016 | /* | |
b6b8a333 | 4017 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 4018 | * |
b6b8a333 | 4019 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 4020 | */ |
b6b8a333 PB |
4021 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
4022 | int nb_sectors, int *pnum) | |
060f51c9 | 4023 | { |
6aebab14 | 4024 | Coroutine *co; |
b6b8a333 | 4025 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
4026 | .bs = bs, |
4027 | .sector_num = sector_num, | |
4028 | .nb_sectors = nb_sectors, | |
4029 | .pnum = pnum, | |
4030 | .done = false, | |
4031 | }; | |
4032 | ||
bdad13b9 PB |
4033 | if (qemu_in_coroutine()) { |
4034 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 4035 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 4036 | } else { |
2572b37a SH |
4037 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4038 | ||
b6b8a333 | 4039 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
4040 | qemu_coroutine_enter(co, &data); |
4041 | while (!data.done) { | |
2572b37a | 4042 | aio_poll(aio_context, true); |
bdad13b9 | 4043 | } |
6aebab14 SH |
4044 | } |
4045 | return data.ret; | |
f58c7b35 TS |
4046 | } |
4047 | ||
b6b8a333 PB |
4048 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
4049 | int nb_sectors, int *pnum) | |
4050 | { | |
4333bb71 PB |
4051 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
4052 | if (ret < 0) { | |
4053 | return ret; | |
4054 | } | |
01fb2705 | 4055 | return !!(ret & BDRV_BLOCK_ALLOCATED); |
b6b8a333 PB |
4056 | } |
4057 | ||
188a7bbf PB |
4058 | /* |
4059 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
4060 | * | |
4061 | * Return true if the given sector is allocated in any image between | |
4062 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
4063 | * sector is allocated in any image of the chain. Return false otherwise. | |
4064 | * | |
4065 | * 'pnum' is set to the number of sectors (including and immediately following | |
4066 | * the specified sector) that are known to be in the same | |
4067 | * allocated/unallocated state. | |
4068 | * | |
4069 | */ | |
4f578637 PB |
4070 | int bdrv_is_allocated_above(BlockDriverState *top, |
4071 | BlockDriverState *base, | |
4072 | int64_t sector_num, | |
4073 | int nb_sectors, int *pnum) | |
188a7bbf PB |
4074 | { |
4075 | BlockDriverState *intermediate; | |
4076 | int ret, n = nb_sectors; | |
4077 | ||
4078 | intermediate = top; | |
4079 | while (intermediate && intermediate != base) { | |
4080 | int pnum_inter; | |
bdad13b9 PB |
4081 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
4082 | &pnum_inter); | |
188a7bbf PB |
4083 | if (ret < 0) { |
4084 | return ret; | |
4085 | } else if (ret) { | |
4086 | *pnum = pnum_inter; | |
4087 | return 1; | |
4088 | } | |
4089 | ||
4090 | /* | |
4091 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
4092 | * might have | |
4093 | * | |
4094 | * [sector_num+x, nr_sectors] allocated. | |
4095 | */ | |
63ba17d3 VI |
4096 | if (n > pnum_inter && |
4097 | (intermediate == top || | |
4098 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
4099 | n = pnum_inter; |
4100 | } | |
4101 | ||
4102 | intermediate = intermediate->backing_hd; | |
4103 | } | |
4104 | ||
4105 | *pnum = n; | |
4106 | return 0; | |
4107 | } | |
4108 | ||
045df330 AL |
4109 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
4110 | { | |
4111 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
4112 | return bs->backing_file; | |
4113 | else if (bs->encrypted) | |
4114 | return bs->filename; | |
4115 | else | |
4116 | return NULL; | |
4117 | } | |
4118 | ||
5fafdf24 | 4119 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
4120 | char *filename, int filename_size) |
4121 | { | |
3574c608 | 4122 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
4123 | } |
4124 | ||
5fafdf24 | 4125 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
4126 | const uint8_t *buf, int nb_sectors) |
4127 | { | |
4128 | BlockDriver *drv = bs->drv; | |
4129 | if (!drv) | |
19cb3738 | 4130 | return -ENOMEDIUM; |
faea38e7 FB |
4131 | if (!drv->bdrv_write_compressed) |
4132 | return -ENOTSUP; | |
fbb7b4e0 KW |
4133 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
4134 | return -EIO; | |
a55eb92c | 4135 | |
e4654d2d | 4136 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 4137 | |
faea38e7 FB |
4138 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
4139 | } | |
3b46e624 | 4140 | |
faea38e7 FB |
4141 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
4142 | { | |
4143 | BlockDriver *drv = bs->drv; | |
4144 | if (!drv) | |
19cb3738 | 4145 | return -ENOMEDIUM; |
faea38e7 FB |
4146 | if (!drv->bdrv_get_info) |
4147 | return -ENOTSUP; | |
4148 | memset(bdi, 0, sizeof(*bdi)); | |
4149 | return drv->bdrv_get_info(bs, bdi); | |
4150 | } | |
4151 | ||
eae041fe HR |
4152 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
4153 | { | |
4154 | BlockDriver *drv = bs->drv; | |
4155 | if (drv && drv->bdrv_get_specific_info) { | |
4156 | return drv->bdrv_get_specific_info(bs); | |
4157 | } | |
4158 | return NULL; | |
4159 | } | |
4160 | ||
45566e9c CH |
4161 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
4162 | int64_t pos, int size) | |
cf8074b3 KW |
4163 | { |
4164 | QEMUIOVector qiov; | |
4165 | struct iovec iov = { | |
4166 | .iov_base = (void *) buf, | |
4167 | .iov_len = size, | |
4168 | }; | |
4169 | ||
4170 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4171 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
4172 | } | |
4173 | ||
4174 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4175 | { |
4176 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4177 | |
4178 | if (!drv) { | |
178e08a5 | 4179 | return -ENOMEDIUM; |
cf8074b3 KW |
4180 | } else if (drv->bdrv_save_vmstate) { |
4181 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4182 | } else if (bs->file) { | |
4183 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4184 | } | |
4185 | ||
7cdb1f6d | 4186 | return -ENOTSUP; |
178e08a5 AL |
4187 | } |
4188 | ||
45566e9c CH |
4189 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4190 | int64_t pos, int size) | |
178e08a5 AL |
4191 | { |
4192 | BlockDriver *drv = bs->drv; | |
4193 | if (!drv) | |
4194 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4195 | if (drv->bdrv_load_vmstate) |
4196 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4197 | if (bs->file) | |
4198 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4199 | return -ENOTSUP; | |
178e08a5 AL |
4200 | } |
4201 | ||
8b9b0cc2 KW |
4202 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4203 | { | |
bf736fe3 | 4204 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4205 | return; |
4206 | } | |
4207 | ||
bf736fe3 | 4208 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4209 | } |
4210 | ||
4211 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4212 | const char *tag) | |
4213 | { | |
4214 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4215 | bs = bs->file; | |
4216 | } | |
4217 | ||
4218 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4219 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4220 | } | |
4221 | ||
4222 | return -ENOTSUP; | |
4223 | } | |
4224 | ||
4cc70e93 FZ |
4225 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4226 | { | |
4227 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4228 | bs = bs->file; | |
4229 | } | |
4230 | ||
4231 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4232 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4233 | } | |
4234 | ||
4235 | return -ENOTSUP; | |
4236 | } | |
4237 | ||
41c695c7 KW |
4238 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4239 | { | |
938789ea | 4240 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
41c695c7 KW |
4241 | bs = bs->file; |
4242 | } | |
8b9b0cc2 | 4243 | |
41c695c7 KW |
4244 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4245 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4246 | } | |
4247 | ||
4248 | return -ENOTSUP; | |
4249 | } | |
4250 | ||
4251 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4252 | { | |
4253 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4254 | bs = bs->file; | |
4255 | } | |
4256 | ||
4257 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4258 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4259 | } | |
4260 | ||
4261 | return false; | |
8b9b0cc2 KW |
4262 | } |
4263 | ||
199630b6 BS |
4264 | int bdrv_is_snapshot(BlockDriverState *bs) |
4265 | { | |
4266 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4267 | } | |
4268 | ||
b1b1d783 JC |
4269 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4270 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4271 | * from a BDS as backing_file should not be done, as that may be relative to | |
4272 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4273 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4274 | const char *backing_file) | |
4275 | { | |
b1b1d783 JC |
4276 | char *filename_full = NULL; |
4277 | char *backing_file_full = NULL; | |
4278 | char *filename_tmp = NULL; | |
4279 | int is_protocol = 0; | |
4280 | BlockDriverState *curr_bs = NULL; | |
4281 | BlockDriverState *retval = NULL; | |
4282 | ||
4283 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4284 | return NULL; |
4285 | } | |
4286 | ||
b1b1d783 JC |
4287 | filename_full = g_malloc(PATH_MAX); |
4288 | backing_file_full = g_malloc(PATH_MAX); | |
4289 | filename_tmp = g_malloc(PATH_MAX); | |
4290 | ||
4291 | is_protocol = path_has_protocol(backing_file); | |
4292 | ||
4293 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4294 | ||
4295 | /* If either of the filename paths is actually a protocol, then | |
4296 | * compare unmodified paths; otherwise make paths relative */ | |
4297 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4298 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4299 | retval = curr_bs->backing_hd; | |
4300 | break; | |
4301 | } | |
e8a6bb9c | 4302 | } else { |
b1b1d783 JC |
4303 | /* If not an absolute filename path, make it relative to the current |
4304 | * image's filename path */ | |
4305 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4306 | backing_file); | |
4307 | ||
4308 | /* We are going to compare absolute pathnames */ | |
4309 | if (!realpath(filename_tmp, filename_full)) { | |
4310 | continue; | |
4311 | } | |
4312 | ||
4313 | /* We need to make sure the backing filename we are comparing against | |
4314 | * is relative to the current image filename (or absolute) */ | |
4315 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4316 | curr_bs->backing_file); | |
4317 | ||
4318 | if (!realpath(filename_tmp, backing_file_full)) { | |
4319 | continue; | |
4320 | } | |
4321 | ||
4322 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4323 | retval = curr_bs->backing_hd; | |
4324 | break; | |
4325 | } | |
e8a6bb9c MT |
4326 | } |
4327 | } | |
4328 | ||
b1b1d783 JC |
4329 | g_free(filename_full); |
4330 | g_free(backing_file_full); | |
4331 | g_free(filename_tmp); | |
4332 | return retval; | |
e8a6bb9c MT |
4333 | } |
4334 | ||
f198fd1c BC |
4335 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4336 | { | |
4337 | if (!bs->drv) { | |
4338 | return 0; | |
4339 | } | |
4340 | ||
4341 | if (!bs->backing_hd) { | |
4342 | return 0; | |
4343 | } | |
4344 | ||
4345 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4346 | } | |
4347 | ||
ea2384d3 | 4348 | /**************************************************************/ |
83f64091 | 4349 | /* async I/Os */ |
ea2384d3 | 4350 | |
3b69e4b9 | 4351 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 4352 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 4353 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 4354 | { |
bbf0a440 SH |
4355 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4356 | ||
d20d9b7c | 4357 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4358 | cb, opaque, false); |
ea2384d3 FB |
4359 | } |
4360 | ||
f141eafe AL |
4361 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4362 | QEMUIOVector *qiov, int nb_sectors, | |
4363 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 4364 | { |
bbf0a440 SH |
4365 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4366 | ||
d20d9b7c | 4367 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4368 | cb, opaque, true); |
83f64091 FB |
4369 | } |
4370 | ||
d5ef94d4 PB |
4371 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
4372 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
4373 | BlockDriverCompletionFunc *cb, void *opaque) | |
4374 | { | |
4375 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4376 | ||
4377 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4378 | BDRV_REQ_ZERO_WRITE | flags, | |
4379 | cb, opaque, true); | |
4380 | } | |
4381 | ||
40b4f539 KW |
4382 | |
4383 | typedef struct MultiwriteCB { | |
4384 | int error; | |
4385 | int num_requests; | |
4386 | int num_callbacks; | |
4387 | struct { | |
4388 | BlockDriverCompletionFunc *cb; | |
4389 | void *opaque; | |
4390 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4391 | } callbacks[]; |
4392 | } MultiwriteCB; | |
4393 | ||
4394 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4395 | { | |
4396 | int i; | |
4397 | ||
4398 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4399 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4400 | if (mcb->callbacks[i].free_qiov) { |
4401 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4402 | } | |
7267c094 | 4403 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4404 | } |
4405 | } | |
4406 | ||
4407 | static void multiwrite_cb(void *opaque, int ret) | |
4408 | { | |
4409 | MultiwriteCB *mcb = opaque; | |
4410 | ||
6d519a5f SH |
4411 | trace_multiwrite_cb(mcb, ret); |
4412 | ||
cb6d3ca0 | 4413 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4414 | mcb->error = ret; |
40b4f539 KW |
4415 | } |
4416 | ||
4417 | mcb->num_requests--; | |
4418 | if (mcb->num_requests == 0) { | |
de189a1b | 4419 | multiwrite_user_cb(mcb); |
7267c094 | 4420 | g_free(mcb); |
40b4f539 KW |
4421 | } |
4422 | } | |
4423 | ||
4424 | static int multiwrite_req_compare(const void *a, const void *b) | |
4425 | { | |
77be4366 CH |
4426 | const BlockRequest *req1 = a, *req2 = b; |
4427 | ||
4428 | /* | |
4429 | * Note that we can't simply subtract req2->sector from req1->sector | |
4430 | * here as that could overflow the return value. | |
4431 | */ | |
4432 | if (req1->sector > req2->sector) { | |
4433 | return 1; | |
4434 | } else if (req1->sector < req2->sector) { | |
4435 | return -1; | |
4436 | } else { | |
4437 | return 0; | |
4438 | } | |
40b4f539 KW |
4439 | } |
4440 | ||
4441 | /* | |
4442 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4443 | * requests that remain after merging. | |
4444 | */ | |
4445 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4446 | int num_reqs, MultiwriteCB *mcb) | |
4447 | { | |
4448 | int i, outidx; | |
4449 | ||
4450 | // Sort requests by start sector | |
4451 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4452 | ||
4453 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4454 | // filling up gaps with zero sectors. | |
4455 | outidx = 0; | |
4456 | for (i = 1; i < num_reqs; i++) { | |
4457 | int merge = 0; | |
4458 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4459 | ||
b6a127a1 | 4460 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4461 | if (reqs[i].sector <= oldreq_last) { |
4462 | merge = 1; | |
4463 | } | |
4464 | ||
e2a305fb CH |
4465 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4466 | merge = 0; | |
4467 | } | |
4468 | ||
40b4f539 KW |
4469 | if (merge) { |
4470 | size_t size; | |
7267c094 | 4471 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4472 | qemu_iovec_init(qiov, |
4473 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4474 | ||
4475 | // Add the first request to the merged one. If the requests are | |
4476 | // overlapping, drop the last sectors of the first request. | |
4477 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4478 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4479 | |
b6a127a1 PB |
4480 | // We should need to add any zeros between the two requests |
4481 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4482 | |
4483 | // Add the second request | |
1b093c48 | 4484 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4485 | |
cbf1dff2 | 4486 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4487 | reqs[outidx].qiov = qiov; |
4488 | ||
4489 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4490 | } else { | |
4491 | outidx++; | |
4492 | reqs[outidx].sector = reqs[i].sector; | |
4493 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4494 | reqs[outidx].qiov = reqs[i].qiov; | |
4495 | } | |
4496 | } | |
4497 | ||
4498 | return outidx + 1; | |
4499 | } | |
4500 | ||
4501 | /* | |
4502 | * Submit multiple AIO write requests at once. | |
4503 | * | |
4504 | * On success, the function returns 0 and all requests in the reqs array have | |
4505 | * been submitted. In error case this function returns -1, and any of the | |
4506 | * requests may or may not be submitted yet. In particular, this means that the | |
4507 | * callback will be called for some of the requests, for others it won't. The | |
4508 | * caller must check the error field of the BlockRequest to wait for the right | |
4509 | * callbacks (if error != 0, no callback will be called). | |
4510 | * | |
4511 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4512 | * requests. However, the fields opaque and error are left unmodified as they | |
4513 | * are used to signal failure for a single request to the caller. | |
4514 | */ | |
4515 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4516 | { | |
40b4f539 KW |
4517 | MultiwriteCB *mcb; |
4518 | int i; | |
4519 | ||
301db7c2 RH |
4520 | /* don't submit writes if we don't have a medium */ |
4521 | if (bs->drv == NULL) { | |
4522 | for (i = 0; i < num_reqs; i++) { | |
4523 | reqs[i].error = -ENOMEDIUM; | |
4524 | } | |
4525 | return -1; | |
4526 | } | |
4527 | ||
40b4f539 KW |
4528 | if (num_reqs == 0) { |
4529 | return 0; | |
4530 | } | |
4531 | ||
4532 | // Create MultiwriteCB structure | |
7267c094 | 4533 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4534 | mcb->num_requests = 0; |
4535 | mcb->num_callbacks = num_reqs; | |
4536 | ||
4537 | for (i = 0; i < num_reqs; i++) { | |
4538 | mcb->callbacks[i].cb = reqs[i].cb; | |
4539 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4540 | } | |
4541 | ||
4542 | // Check for mergable requests | |
4543 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4544 | ||
6d519a5f SH |
4545 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4546 | ||
df9309fb PB |
4547 | /* Run the aio requests. */ |
4548 | mcb->num_requests = num_reqs; | |
40b4f539 | 4549 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4550 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4551 | reqs[i].nb_sectors, reqs[i].flags, | |
4552 | multiwrite_cb, mcb, | |
4553 | true); | |
40b4f539 KW |
4554 | } |
4555 | ||
4556 | return 0; | |
40b4f539 KW |
4557 | } |
4558 | ||
83f64091 | 4559 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 4560 | { |
d7331bed | 4561 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
4562 | } |
4563 | ||
4564 | /**************************************************************/ | |
4565 | /* async block device emulation */ | |
4566 | ||
c16b5a2c CH |
4567 | typedef struct BlockDriverAIOCBSync { |
4568 | BlockDriverAIOCB common; | |
4569 | QEMUBH *bh; | |
4570 | int ret; | |
4571 | /* vector translation state */ | |
4572 | QEMUIOVector *qiov; | |
4573 | uint8_t *bounce; | |
4574 | int is_write; | |
4575 | } BlockDriverAIOCBSync; | |
4576 | ||
4577 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
4578 | { | |
b666d239 KW |
4579 | BlockDriverAIOCBSync *acb = |
4580 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 4581 | qemu_bh_delete(acb->bh); |
36afc451 | 4582 | acb->bh = NULL; |
c16b5a2c CH |
4583 | qemu_aio_release(acb); |
4584 | } | |
4585 | ||
d7331bed | 4586 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
4587 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
4588 | .cancel = bdrv_aio_cancel_em, | |
4589 | }; | |
4590 | ||
ce1a14dc | 4591 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4592 | { |
ce1a14dc | 4593 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4594 | |
f141eafe | 4595 | if (!acb->is_write) |
03396148 | 4596 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 4597 | qemu_vfree(acb->bounce); |
ce1a14dc | 4598 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4599 | qemu_bh_delete(acb->bh); |
36afc451 | 4600 | acb->bh = NULL; |
ce1a14dc | 4601 | qemu_aio_release(acb); |
83f64091 | 4602 | } |
beac80cd | 4603 | |
f141eafe AL |
4604 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4605 | int64_t sector_num, | |
4606 | QEMUIOVector *qiov, | |
4607 | int nb_sectors, | |
4608 | BlockDriverCompletionFunc *cb, | |
4609 | void *opaque, | |
4610 | int is_write) | |
4611 | ||
83f64091 | 4612 | { |
ce1a14dc | 4613 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4614 | |
d7331bed | 4615 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4616 | acb->is_write = is_write; |
4617 | acb->qiov = qiov; | |
e268ca52 | 4618 | acb->bounce = qemu_blockalign(bs, qiov->size); |
2572b37a | 4619 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
f141eafe AL |
4620 | |
4621 | if (is_write) { | |
d5e6b161 | 4622 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4623 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4624 | } else { |
1ed20acf | 4625 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4626 | } |
4627 | ||
ce1a14dc | 4628 | qemu_bh_schedule(acb->bh); |
f141eafe | 4629 | |
ce1a14dc | 4630 | return &acb->common; |
beac80cd FB |
4631 | } |
4632 | ||
f141eafe AL |
4633 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4634 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4635 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4636 | { |
f141eafe AL |
4637 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4638 | } | |
83f64091 | 4639 | |
f141eafe AL |
4640 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4641 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4642 | BlockDriverCompletionFunc *cb, void *opaque) | |
4643 | { | |
4644 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4645 | } |
beac80cd | 4646 | |
68485420 KW |
4647 | |
4648 | typedef struct BlockDriverAIOCBCoroutine { | |
4649 | BlockDriverAIOCB common; | |
4650 | BlockRequest req; | |
4651 | bool is_write; | |
d318aea9 | 4652 | bool *done; |
68485420 KW |
4653 | QEMUBH* bh; |
4654 | } BlockDriverAIOCBCoroutine; | |
4655 | ||
4656 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
4657 | { | |
2572b37a | 4658 | AioContext *aio_context = bdrv_get_aio_context(blockacb->bs); |
d318aea9 KW |
4659 | BlockDriverAIOCBCoroutine *acb = |
4660 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
4661 | bool done = false; | |
4662 | ||
4663 | acb->done = &done; | |
4664 | while (!done) { | |
2572b37a | 4665 | aio_poll(aio_context, true); |
d318aea9 | 4666 | } |
68485420 KW |
4667 | } |
4668 | ||
d7331bed | 4669 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
4670 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
4671 | .cancel = bdrv_aio_co_cancel_em, | |
4672 | }; | |
4673 | ||
35246a68 | 4674 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4675 | { |
4676 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4677 | ||
4678 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
4679 | |
4680 | if (acb->done) { | |
4681 | *acb->done = true; | |
4682 | } | |
4683 | ||
68485420 KW |
4684 | qemu_bh_delete(acb->bh); |
4685 | qemu_aio_release(acb); | |
4686 | } | |
4687 | ||
b2a61371 SH |
4688 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4689 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4690 | { | |
4691 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4692 | BlockDriverState *bs = acb->common.bs; | |
4693 | ||
4694 | if (!acb->is_write) { | |
4695 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4696 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4697 | } else { |
4698 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4699 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4700 | } |
4701 | ||
2572b37a | 4702 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2a61371 SH |
4703 | qemu_bh_schedule(acb->bh); |
4704 | } | |
4705 | ||
68485420 KW |
4706 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4707 | int64_t sector_num, | |
4708 | QEMUIOVector *qiov, | |
4709 | int nb_sectors, | |
d20d9b7c | 4710 | BdrvRequestFlags flags, |
68485420 KW |
4711 | BlockDriverCompletionFunc *cb, |
4712 | void *opaque, | |
8c5873d6 | 4713 | bool is_write) |
68485420 KW |
4714 | { |
4715 | Coroutine *co; | |
4716 | BlockDriverAIOCBCoroutine *acb; | |
4717 | ||
d7331bed | 4718 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4719 | acb->req.sector = sector_num; |
4720 | acb->req.nb_sectors = nb_sectors; | |
4721 | acb->req.qiov = qiov; | |
d20d9b7c | 4722 | acb->req.flags = flags; |
68485420 | 4723 | acb->is_write = is_write; |
d318aea9 | 4724 | acb->done = NULL; |
68485420 | 4725 | |
8c5873d6 | 4726 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4727 | qemu_coroutine_enter(co, acb); |
4728 | ||
4729 | return &acb->common; | |
4730 | } | |
4731 | ||
07f07615 | 4732 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4733 | { |
07f07615 PB |
4734 | BlockDriverAIOCBCoroutine *acb = opaque; |
4735 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4736 | |
07f07615 | 4737 | acb->req.error = bdrv_co_flush(bs); |
2572b37a | 4738 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2e12bc6 | 4739 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4740 | } |
4741 | ||
07f07615 | 4742 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4743 | BlockDriverCompletionFunc *cb, void *opaque) |
4744 | { | |
07f07615 | 4745 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4746 | |
07f07615 PB |
4747 | Coroutine *co; |
4748 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4749 | |
d7331bed | 4750 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
4751 | acb->done = NULL; |
4752 | ||
07f07615 PB |
4753 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4754 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4755 | |
016f5cf6 AG |
4756 | return &acb->common; |
4757 | } | |
4758 | ||
4265d620 PB |
4759 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4760 | { | |
4761 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4762 | BlockDriverState *bs = acb->common.bs; | |
4763 | ||
4764 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
2572b37a | 4765 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
4265d620 PB |
4766 | qemu_bh_schedule(acb->bh); |
4767 | } | |
4768 | ||
4769 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4770 | int64_t sector_num, int nb_sectors, | |
4771 | BlockDriverCompletionFunc *cb, void *opaque) | |
4772 | { | |
4773 | Coroutine *co; | |
4774 | BlockDriverAIOCBCoroutine *acb; | |
4775 | ||
4776 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4777 | ||
d7331bed | 4778 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4779 | acb->req.sector = sector_num; |
4780 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4781 | acb->done = NULL; |
4265d620 PB |
4782 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4783 | qemu_coroutine_enter(co, acb); | |
4784 | ||
4785 | return &acb->common; | |
4786 | } | |
4787 | ||
ea2384d3 FB |
4788 | void bdrv_init(void) |
4789 | { | |
5efa9d5a | 4790 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4791 | } |
ce1a14dc | 4792 | |
eb852011 MA |
4793 | void bdrv_init_with_whitelist(void) |
4794 | { | |
4795 | use_bdrv_whitelist = 1; | |
4796 | bdrv_init(); | |
4797 | } | |
4798 | ||
d7331bed | 4799 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4800 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4801 | { |
ce1a14dc PB |
4802 | BlockDriverAIOCB *acb; |
4803 | ||
d7331bed SH |
4804 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4805 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4806 | acb->bs = bs; |
4807 | acb->cb = cb; | |
4808 | acb->opaque = opaque; | |
4809 | return acb; | |
4810 | } | |
4811 | ||
4812 | void qemu_aio_release(void *p) | |
4813 | { | |
d37c975f | 4814 | BlockDriverAIOCB *acb = p; |
d7331bed | 4815 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4816 | } |
19cb3738 | 4817 | |
f9f05dc5 KW |
4818 | /**************************************************************/ |
4819 | /* Coroutine block device emulation */ | |
4820 | ||
4821 | typedef struct CoroutineIOCompletion { | |
4822 | Coroutine *coroutine; | |
4823 | int ret; | |
4824 | } CoroutineIOCompletion; | |
4825 | ||
4826 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4827 | { | |
4828 | CoroutineIOCompletion *co = opaque; | |
4829 | ||
4830 | co->ret = ret; | |
4831 | qemu_coroutine_enter(co->coroutine, NULL); | |
4832 | } | |
4833 | ||
4834 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4835 | int nb_sectors, QEMUIOVector *iov, | |
4836 | bool is_write) | |
4837 | { | |
4838 | CoroutineIOCompletion co = { | |
4839 | .coroutine = qemu_coroutine_self(), | |
4840 | }; | |
4841 | BlockDriverAIOCB *acb; | |
4842 | ||
4843 | if (is_write) { | |
a652d160 SH |
4844 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4845 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4846 | } else { |
a652d160 SH |
4847 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4848 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4849 | } |
4850 | ||
59370aaa | 4851 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4852 | if (!acb) { |
4853 | return -EIO; | |
4854 | } | |
4855 | qemu_coroutine_yield(); | |
4856 | ||
4857 | return co.ret; | |
4858 | } | |
4859 | ||
4860 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4861 | int64_t sector_num, int nb_sectors, | |
4862 | QEMUIOVector *iov) | |
4863 | { | |
4864 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4865 | } | |
4866 | ||
4867 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4868 | int64_t sector_num, int nb_sectors, | |
4869 | QEMUIOVector *iov) | |
4870 | { | |
4871 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4872 | } | |
4873 | ||
07f07615 | 4874 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4875 | { |
07f07615 PB |
4876 | RwCo *rwco = opaque; |
4877 | ||
4878 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4879 | } | |
4880 | ||
4881 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4882 | { | |
eb489bb1 KW |
4883 | int ret; |
4884 | ||
29cdb251 | 4885 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4886 | return 0; |
eb489bb1 KW |
4887 | } |
4888 | ||
ca716364 | 4889 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4890 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4891 | if (bs->drv->bdrv_co_flush_to_os) { |
4892 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4893 | if (ret < 0) { | |
4894 | return ret; | |
4895 | } | |
4896 | } | |
4897 | ||
ca716364 KW |
4898 | /* But don't actually force it to the disk with cache=unsafe */ |
4899 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4900 | goto flush_parent; |
ca716364 KW |
4901 | } |
4902 | ||
bf736fe3 | 4903 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4904 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4905 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4906 | } else if (bs->drv->bdrv_aio_flush) { |
4907 | BlockDriverAIOCB *acb; | |
4908 | CoroutineIOCompletion co = { | |
4909 | .coroutine = qemu_coroutine_self(), | |
4910 | }; | |
4911 | ||
4912 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4913 | if (acb == NULL) { | |
29cdb251 | 4914 | ret = -EIO; |
07f07615 PB |
4915 | } else { |
4916 | qemu_coroutine_yield(); | |
29cdb251 | 4917 | ret = co.ret; |
07f07615 | 4918 | } |
07f07615 PB |
4919 | } else { |
4920 | /* | |
4921 | * Some block drivers always operate in either writethrough or unsafe | |
4922 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4923 | * know how the server works (because the behaviour is hardcoded or | |
4924 | * depends on server-side configuration), so we can't ensure that | |
4925 | * everything is safe on disk. Returning an error doesn't work because | |
4926 | * that would break guests even if the server operates in writethrough | |
4927 | * mode. | |
4928 | * | |
4929 | * Let's hope the user knows what he's doing. | |
4930 | */ | |
29cdb251 | 4931 | ret = 0; |
07f07615 | 4932 | } |
29cdb251 PB |
4933 | if (ret < 0) { |
4934 | return ret; | |
4935 | } | |
4936 | ||
4937 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4938 | * in the case of cache=unsafe, so there are no useless flushes. | |
4939 | */ | |
d4c82329 | 4940 | flush_parent: |
29cdb251 | 4941 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4942 | } |
4943 | ||
5a8a30db | 4944 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 4945 | { |
5a8a30db KW |
4946 | Error *local_err = NULL; |
4947 | int ret; | |
4948 | ||
3456a8d1 KW |
4949 | if (!bs->drv) { |
4950 | return; | |
4951 | } | |
4952 | ||
4953 | if (bs->drv->bdrv_invalidate_cache) { | |
5a8a30db | 4954 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
3456a8d1 | 4955 | } else if (bs->file) { |
5a8a30db KW |
4956 | bdrv_invalidate_cache(bs->file, &local_err); |
4957 | } | |
4958 | if (local_err) { | |
4959 | error_propagate(errp, local_err); | |
4960 | return; | |
0f15423c | 4961 | } |
3456a8d1 | 4962 | |
5a8a30db KW |
4963 | ret = refresh_total_sectors(bs, bs->total_sectors); |
4964 | if (ret < 0) { | |
4965 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
4966 | return; | |
4967 | } | |
0f15423c AL |
4968 | } |
4969 | ||
5a8a30db | 4970 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c AL |
4971 | { |
4972 | BlockDriverState *bs; | |
5a8a30db | 4973 | Error *local_err = NULL; |
0f15423c | 4974 | |
dc364f4c | 4975 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
4976 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4977 | ||
4978 | aio_context_acquire(aio_context); | |
5a8a30db | 4979 | bdrv_invalidate_cache(bs, &local_err); |
ed78cda3 | 4980 | aio_context_release(aio_context); |
5a8a30db KW |
4981 | if (local_err) { |
4982 | error_propagate(errp, local_err); | |
4983 | return; | |
4984 | } | |
0f15423c AL |
4985 | } |
4986 | } | |
4987 | ||
07789269 BC |
4988 | void bdrv_clear_incoming_migration_all(void) |
4989 | { | |
4990 | BlockDriverState *bs; | |
4991 | ||
dc364f4c | 4992 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
4993 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4994 | ||
4995 | aio_context_acquire(aio_context); | |
07789269 | 4996 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
ed78cda3 | 4997 | aio_context_release(aio_context); |
07789269 BC |
4998 | } |
4999 | } | |
5000 | ||
07f07615 PB |
5001 | int bdrv_flush(BlockDriverState *bs) |
5002 | { | |
5003 | Coroutine *co; | |
5004 | RwCo rwco = { | |
5005 | .bs = bs, | |
5006 | .ret = NOT_DONE, | |
e7a8a783 | 5007 | }; |
e7a8a783 | 5008 | |
07f07615 PB |
5009 | if (qemu_in_coroutine()) { |
5010 | /* Fast-path if already in coroutine context */ | |
5011 | bdrv_flush_co_entry(&rwco); | |
5012 | } else { | |
2572b37a SH |
5013 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5014 | ||
07f07615 PB |
5015 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
5016 | qemu_coroutine_enter(co, &rwco); | |
5017 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5018 | aio_poll(aio_context, true); |
07f07615 | 5019 | } |
e7a8a783 | 5020 | } |
07f07615 PB |
5021 | |
5022 | return rwco.ret; | |
e7a8a783 KW |
5023 | } |
5024 | ||
775aa8b6 KW |
5025 | typedef struct DiscardCo { |
5026 | BlockDriverState *bs; | |
5027 | int64_t sector_num; | |
5028 | int nb_sectors; | |
5029 | int ret; | |
5030 | } DiscardCo; | |
4265d620 PB |
5031 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
5032 | { | |
775aa8b6 | 5033 | DiscardCo *rwco = opaque; |
4265d620 PB |
5034 | |
5035 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
5036 | } | |
5037 | ||
6f14da52 PL |
5038 | /* if no limit is specified in the BlockLimits use a default |
5039 | * of 32768 512-byte sectors (16 MiB) per request. | |
5040 | */ | |
5041 | #define MAX_DISCARD_DEFAULT 32768 | |
5042 | ||
4265d620 PB |
5043 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
5044 | int nb_sectors) | |
5045 | { | |
d51e9fe5 PB |
5046 | int max_discard; |
5047 | ||
4265d620 PB |
5048 | if (!bs->drv) { |
5049 | return -ENOMEDIUM; | |
5050 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
5051 | return -EIO; | |
5052 | } else if (bs->read_only) { | |
5053 | return -EROFS; | |
df702c9b PB |
5054 | } |
5055 | ||
e4654d2d | 5056 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 5057 | |
9e8f1835 PB |
5058 | /* Do nothing if disabled. */ |
5059 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
5060 | return 0; | |
5061 | } | |
5062 | ||
d51e9fe5 PB |
5063 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
5064 | return 0; | |
5065 | } | |
6f14da52 | 5066 | |
d51e9fe5 PB |
5067 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
5068 | while (nb_sectors > 0) { | |
5069 | int ret; | |
5070 | int num = nb_sectors; | |
6f14da52 | 5071 | |
d51e9fe5 PB |
5072 | /* align request */ |
5073 | if (bs->bl.discard_alignment && | |
5074 | num >= bs->bl.discard_alignment && | |
5075 | sector_num % bs->bl.discard_alignment) { | |
5076 | if (num > bs->bl.discard_alignment) { | |
5077 | num = bs->bl.discard_alignment; | |
6f14da52 | 5078 | } |
d51e9fe5 PB |
5079 | num -= sector_num % bs->bl.discard_alignment; |
5080 | } | |
6f14da52 | 5081 | |
d51e9fe5 PB |
5082 | /* limit request size */ |
5083 | if (num > max_discard) { | |
5084 | num = max_discard; | |
5085 | } | |
6f14da52 | 5086 | |
d51e9fe5 | 5087 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 5088 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
5089 | } else { |
5090 | BlockDriverAIOCB *acb; | |
5091 | CoroutineIOCompletion co = { | |
5092 | .coroutine = qemu_coroutine_self(), | |
5093 | }; | |
5094 | ||
5095 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
5096 | bdrv_co_io_em_complete, &co); | |
5097 | if (acb == NULL) { | |
5098 | return -EIO; | |
5099 | } else { | |
5100 | qemu_coroutine_yield(); | |
5101 | ret = co.ret; | |
6f14da52 | 5102 | } |
6f14da52 | 5103 | } |
7ce21016 | 5104 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 5105 | return ret; |
4265d620 | 5106 | } |
d51e9fe5 PB |
5107 | |
5108 | sector_num += num; | |
5109 | nb_sectors -= num; | |
4265d620 | 5110 | } |
d51e9fe5 | 5111 | return 0; |
4265d620 PB |
5112 | } |
5113 | ||
5114 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
5115 | { | |
5116 | Coroutine *co; | |
775aa8b6 | 5117 | DiscardCo rwco = { |
4265d620 PB |
5118 | .bs = bs, |
5119 | .sector_num = sector_num, | |
5120 | .nb_sectors = nb_sectors, | |
5121 | .ret = NOT_DONE, | |
5122 | }; | |
5123 | ||
5124 | if (qemu_in_coroutine()) { | |
5125 | /* Fast-path if already in coroutine context */ | |
5126 | bdrv_discard_co_entry(&rwco); | |
5127 | } else { | |
2572b37a SH |
5128 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5129 | ||
4265d620 PB |
5130 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
5131 | qemu_coroutine_enter(co, &rwco); | |
5132 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5133 | aio_poll(aio_context, true); |
4265d620 PB |
5134 | } |
5135 | } | |
5136 | ||
5137 | return rwco.ret; | |
5138 | } | |
5139 | ||
19cb3738 FB |
5140 | /**************************************************************/ |
5141 | /* removable device support */ | |
5142 | ||
5143 | /** | |
5144 | * Return TRUE if the media is present | |
5145 | */ | |
5146 | int bdrv_is_inserted(BlockDriverState *bs) | |
5147 | { | |
5148 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 5149 | |
19cb3738 FB |
5150 | if (!drv) |
5151 | return 0; | |
5152 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
5153 | return 1; |
5154 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
5155 | } |
5156 | ||
5157 | /** | |
8e49ca46 MA |
5158 | * Return whether the media changed since the last call to this |
5159 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
5160 | */ |
5161 | int bdrv_media_changed(BlockDriverState *bs) | |
5162 | { | |
5163 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5164 | |
8e49ca46 MA |
5165 | if (drv && drv->bdrv_media_changed) { |
5166 | return drv->bdrv_media_changed(bs); | |
5167 | } | |
5168 | return -ENOTSUP; | |
19cb3738 FB |
5169 | } |
5170 | ||
5171 | /** | |
5172 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
5173 | */ | |
f36f3949 | 5174 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
5175 | { |
5176 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5177 | |
822e1cd1 MA |
5178 | if (drv && drv->bdrv_eject) { |
5179 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 5180 | } |
6f382ed2 LC |
5181 | |
5182 | if (bs->device_name[0] != '\0') { | |
a5ee7bd4 WX |
5183 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
5184 | eject_flag, &error_abort); | |
6f382ed2 | 5185 | } |
19cb3738 FB |
5186 | } |
5187 | ||
19cb3738 FB |
5188 | /** |
5189 | * Lock or unlock the media (if it is locked, the user won't be able | |
5190 | * to eject it manually). | |
5191 | */ | |
025e849a | 5192 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
5193 | { |
5194 | BlockDriver *drv = bs->drv; | |
5195 | ||
025e849a | 5196 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5197 | |
025e849a MA |
5198 | if (drv && drv->bdrv_lock_medium) { |
5199 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5200 | } |
5201 | } | |
985a03b0 TS |
5202 | |
5203 | /* needed for generic scsi interface */ | |
5204 | ||
5205 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5206 | { | |
5207 | BlockDriver *drv = bs->drv; | |
5208 | ||
5209 | if (drv && drv->bdrv_ioctl) | |
5210 | return drv->bdrv_ioctl(bs, req, buf); | |
5211 | return -ENOTSUP; | |
5212 | } | |
7d780669 | 5213 | |
221f715d AL |
5214 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
5215 | unsigned long int req, void *buf, | |
5216 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 5217 | { |
221f715d | 5218 | BlockDriver *drv = bs->drv; |
7d780669 | 5219 | |
221f715d AL |
5220 | if (drv && drv->bdrv_aio_ioctl) |
5221 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5222 | return NULL; | |
7d780669 | 5223 | } |
e268ca52 | 5224 | |
1b7fd729 | 5225 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5226 | { |
1b7fd729 | 5227 | bs->guest_block_size = align; |
7b6f9300 | 5228 | } |
7cd1e32a | 5229 | |
e268ca52 AL |
5230 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5231 | { | |
339064d5 | 5232 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5233 | } |
7cd1e32a | 5234 | |
c53b1c51 SH |
5235 | /* |
5236 | * Check if all memory in this vector is sector aligned. | |
5237 | */ | |
5238 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5239 | { | |
5240 | int i; | |
339064d5 | 5241 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5242 | |
5243 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5244 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5245 | return false; |
1ff735bd | 5246 | } |
339064d5 | 5247 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5248 | return false; |
c53b1c51 SH |
5249 | } |
5250 | } | |
5251 | ||
5252 | return true; | |
5253 | } | |
5254 | ||
b8afb520 FZ |
5255 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
5256 | Error **errp) | |
7cd1e32a LS |
5257 | { |
5258 | int64_t bitmap_size; | |
e4654d2d | 5259 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 5260 | |
50717e94 PB |
5261 | assert((granularity & (granularity - 1)) == 0); |
5262 | ||
e4654d2d FZ |
5263 | granularity >>= BDRV_SECTOR_BITS; |
5264 | assert(granularity); | |
b8afb520 FZ |
5265 | bitmap_size = bdrv_getlength(bs); |
5266 | if (bitmap_size < 0) { | |
5267 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); | |
5268 | errno = -bitmap_size; | |
5269 | return NULL; | |
5270 | } | |
5271 | bitmap_size >>= BDRV_SECTOR_BITS; | |
e4654d2d FZ |
5272 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); |
5273 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
5274 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
5275 | return bitmap; | |
5276 | } | |
5277 | ||
5278 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
5279 | { | |
5280 | BdrvDirtyBitmap *bm, *next; | |
5281 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5282 | if (bm == bitmap) { | |
5283 | QLIST_REMOVE(bitmap, list); | |
5284 | hbitmap_free(bitmap->bitmap); | |
5285 | g_free(bitmap); | |
5286 | return; | |
a55eb92c | 5287 | } |
7cd1e32a LS |
5288 | } |
5289 | } | |
5290 | ||
21b56835 FZ |
5291 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5292 | { | |
5293 | BdrvDirtyBitmap *bm; | |
5294 | BlockDirtyInfoList *list = NULL; | |
5295 | BlockDirtyInfoList **plist = &list; | |
5296 | ||
5297 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5298 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); | |
5299 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); | |
5300 | info->count = bdrv_get_dirty_count(bs, bm); | |
5301 | info->granularity = | |
5302 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
5303 | entry->value = info; | |
5304 | *plist = entry; | |
5305 | plist = &entry->next; | |
5306 | } | |
5307 | ||
5308 | return list; | |
5309 | } | |
5310 | ||
e4654d2d | 5311 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5312 | { |
e4654d2d FZ |
5313 | if (bitmap) { |
5314 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5315 | } else { |
5316 | return 0; | |
5317 | } | |
5318 | } | |
5319 | ||
e4654d2d FZ |
5320 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
5321 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 5322 | { |
e4654d2d | 5323 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5324 | } |
5325 | ||
5326 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
5327 | int nr_sectors) | |
5328 | { | |
e4654d2d FZ |
5329 | BdrvDirtyBitmap *bitmap; |
5330 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5331 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5332 | } | |
1755da16 PB |
5333 | } |
5334 | ||
e4654d2d | 5335 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 5336 | { |
e4654d2d FZ |
5337 | BdrvDirtyBitmap *bitmap; |
5338 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5339 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5340 | } | |
7cd1e32a | 5341 | } |
aaa0eb75 | 5342 | |
e4654d2d | 5343 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5344 | { |
e4654d2d | 5345 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5346 | } |
f88e1a42 | 5347 | |
9fcb0251 FZ |
5348 | /* Get a reference to bs */ |
5349 | void bdrv_ref(BlockDriverState *bs) | |
5350 | { | |
5351 | bs->refcnt++; | |
5352 | } | |
5353 | ||
5354 | /* Release a previously grabbed reference to bs. | |
5355 | * If after releasing, reference count is zero, the BlockDriverState is | |
5356 | * deleted. */ | |
5357 | void bdrv_unref(BlockDriverState *bs) | |
5358 | { | |
5359 | assert(bs->refcnt > 0); | |
5360 | if (--bs->refcnt == 0) { | |
5361 | bdrv_delete(bs); | |
5362 | } | |
5363 | } | |
5364 | ||
fbe40ff7 FZ |
5365 | struct BdrvOpBlocker { |
5366 | Error *reason; | |
5367 | QLIST_ENTRY(BdrvOpBlocker) list; | |
5368 | }; | |
5369 | ||
5370 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
5371 | { | |
5372 | BdrvOpBlocker *blocker; | |
5373 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5374 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
5375 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
5376 | if (errp) { | |
5377 | error_setg(errp, "Device '%s' is busy: %s", | |
5378 | bs->device_name, error_get_pretty(blocker->reason)); | |
5379 | } | |
5380 | return true; | |
5381 | } | |
5382 | return false; | |
5383 | } | |
5384 | ||
5385 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5386 | { | |
5387 | BdrvOpBlocker *blocker; | |
5388 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5389 | ||
5390 | blocker = g_malloc0(sizeof(BdrvOpBlocker)); | |
5391 | blocker->reason = reason; | |
5392 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
5393 | } | |
5394 | ||
5395 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5396 | { | |
5397 | BdrvOpBlocker *blocker, *next; | |
5398 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5399 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
5400 | if (blocker->reason == reason) { | |
5401 | QLIST_REMOVE(blocker, list); | |
5402 | g_free(blocker); | |
5403 | } | |
5404 | } | |
5405 | } | |
5406 | ||
5407 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
5408 | { | |
5409 | int i; | |
5410 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5411 | bdrv_op_block(bs, i, reason); | |
5412 | } | |
5413 | } | |
5414 | ||
5415 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
5416 | { | |
5417 | int i; | |
5418 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5419 | bdrv_op_unblock(bs, i, reason); | |
5420 | } | |
5421 | } | |
5422 | ||
5423 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
5424 | { | |
5425 | int i; | |
5426 | ||
5427 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5428 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
5429 | return false; | |
5430 | } | |
5431 | } | |
5432 | return true; | |
5433 | } | |
5434 | ||
28a7282a LC |
5435 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5436 | { | |
d6bf279e | 5437 | bs->iostatus_enabled = true; |
58e21ef5 | 5438 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5439 | } |
5440 | ||
5441 | /* The I/O status is only enabled if the drive explicitly | |
5442 | * enables it _and_ the VM is configured to stop on errors */ | |
5443 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5444 | { | |
d6bf279e | 5445 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5446 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5447 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5448 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5449 | } |
5450 | ||
5451 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5452 | { | |
d6bf279e | 5453 | bs->iostatus_enabled = false; |
28a7282a LC |
5454 | } |
5455 | ||
5456 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5457 | { | |
5458 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5459 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5460 | if (bs->job) { |
5461 | block_job_iostatus_reset(bs->job); | |
5462 | } | |
28a7282a LC |
5463 | } |
5464 | } | |
5465 | ||
28a7282a LC |
5466 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5467 | { | |
3e1caa5f PB |
5468 | assert(bdrv_iostatus_is_enabled(bs)); |
5469 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5470 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5471 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5472 | } |
5473 | } | |
5474 | ||
a597e79c CH |
5475 | void |
5476 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
5477 | enum BlockAcctType type) | |
5478 | { | |
5479 | assert(type < BDRV_MAX_IOTYPE); | |
5480 | ||
5481 | cookie->bytes = bytes; | |
c488c7f6 | 5482 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
5483 | cookie->type = type; |
5484 | } | |
5485 | ||
5486 | void | |
5487 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
5488 | { | |
5489 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
5490 | ||
5491 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
5492 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 5493 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
5494 | } |
5495 | ||
d92ada22 LC |
5496 | void bdrv_img_create(const char *filename, const char *fmt, |
5497 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5498 | char *options, uint64_t img_size, int flags, |
5499 | Error **errp, bool quiet) | |
f88e1a42 | 5500 | { |
83d0521a CL |
5501 | QemuOptsList *create_opts = NULL; |
5502 | QemuOpts *opts = NULL; | |
5503 | const char *backing_fmt, *backing_file; | |
5504 | int64_t size; | |
f88e1a42 | 5505 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5506 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5507 | Error *local_err = NULL; |
f88e1a42 JS |
5508 | int ret = 0; |
5509 | ||
5510 | /* Find driver and parse its options */ | |
5511 | drv = bdrv_find_format(fmt); | |
5512 | if (!drv) { | |
71c79813 | 5513 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5514 | return; |
f88e1a42 JS |
5515 | } |
5516 | ||
98289620 | 5517 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 5518 | if (!proto_drv) { |
71c79813 | 5519 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 5520 | return; |
f88e1a42 JS |
5521 | } |
5522 | ||
c282e1fd CL |
5523 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
5524 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); | |
f88e1a42 JS |
5525 | |
5526 | /* Create parameter list with default values */ | |
83d0521a CL |
5527 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
5528 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size); | |
f88e1a42 JS |
5529 | |
5530 | /* Parse -o options */ | |
5531 | if (options) { | |
83d0521a CL |
5532 | if (qemu_opts_do_parse(opts, options, NULL) != 0) { |
5533 | error_setg(errp, "Invalid options for file format '%s'", fmt); | |
f88e1a42 JS |
5534 | goto out; |
5535 | } | |
5536 | } | |
5537 | ||
5538 | if (base_filename) { | |
83d0521a | 5539 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename)) { |
71c79813 LC |
5540 | error_setg(errp, "Backing file not supported for file format '%s'", |
5541 | fmt); | |
f88e1a42 JS |
5542 | goto out; |
5543 | } | |
5544 | } | |
5545 | ||
5546 | if (base_fmt) { | |
83d0521a | 5547 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
71c79813 LC |
5548 | error_setg(errp, "Backing file format not supported for file " |
5549 | "format '%s'", fmt); | |
f88e1a42 JS |
5550 | goto out; |
5551 | } | |
5552 | } | |
5553 | ||
83d0521a CL |
5554 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
5555 | if (backing_file) { | |
5556 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
5557 | error_setg(errp, "Error: Trying to create an image with the " |
5558 | "same filename as the backing file"); | |
792da93a JS |
5559 | goto out; |
5560 | } | |
5561 | } | |
5562 | ||
83d0521a CL |
5563 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
5564 | if (backing_fmt) { | |
5565 | backing_drv = bdrv_find_format(backing_fmt); | |
96df67d1 | 5566 | if (!backing_drv) { |
71c79813 | 5567 | error_setg(errp, "Unknown backing file format '%s'", |
83d0521a | 5568 | backing_fmt); |
f88e1a42 JS |
5569 | goto out; |
5570 | } | |
5571 | } | |
5572 | ||
5573 | // The size for the image must always be specified, with one exception: | |
5574 | // If we are using a backing file, we can obtain the size from there | |
83d0521a CL |
5575 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
5576 | if (size == -1) { | |
5577 | if (backing_file) { | |
66f6b814 | 5578 | BlockDriverState *bs; |
f88e1a42 | 5579 | uint64_t size; |
63090dac PB |
5580 | int back_flags; |
5581 | ||
5582 | /* backing files always opened read-only */ | |
5583 | back_flags = | |
5584 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5585 | |
f67503e5 | 5586 | bs = NULL; |
83d0521a | 5587 | ret = bdrv_open(&bs, backing_file, NULL, NULL, back_flags, |
cc84d90f | 5588 | backing_drv, &local_err); |
f88e1a42 | 5589 | if (ret < 0) { |
cc84d90f | 5590 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
83d0521a | 5591 | backing_file, |
cc84d90f HR |
5592 | error_get_pretty(local_err)); |
5593 | error_free(local_err); | |
5594 | local_err = NULL; | |
f88e1a42 JS |
5595 | goto out; |
5596 | } | |
5597 | bdrv_get_geometry(bs, &size); | |
5598 | size *= 512; | |
5599 | ||
83d0521a | 5600 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size); |
66f6b814 HR |
5601 | |
5602 | bdrv_unref(bs); | |
f88e1a42 | 5603 | } else { |
71c79813 | 5604 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5605 | goto out; |
5606 | } | |
5607 | } | |
5608 | ||
f382d43a MR |
5609 | if (!quiet) { |
5610 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
83d0521a | 5611 | qemu_opts_print(opts); |
f382d43a MR |
5612 | puts(""); |
5613 | } | |
83d0521a | 5614 | |
c282e1fd | 5615 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 5616 | |
cc84d90f HR |
5617 | if (ret == -EFBIG) { |
5618 | /* This is generally a better message than whatever the driver would | |
5619 | * deliver (especially because of the cluster_size_hint), since that | |
5620 | * is most probably not much different from "image too large". */ | |
5621 | const char *cluster_size_hint = ""; | |
83d0521a | 5622 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 5623 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 5624 | } |
cc84d90f HR |
5625 | error_setg(errp, "The image size is too large for file format '%s'" |
5626 | "%s", fmt, cluster_size_hint); | |
5627 | error_free(local_err); | |
5628 | local_err = NULL; | |
f88e1a42 JS |
5629 | } |
5630 | ||
5631 | out: | |
83d0521a CL |
5632 | qemu_opts_del(opts); |
5633 | qemu_opts_free(create_opts); | |
84d18f06 | 5634 | if (local_err) { |
cc84d90f HR |
5635 | error_propagate(errp, local_err); |
5636 | } | |
f88e1a42 | 5637 | } |
85d126f3 SH |
5638 | |
5639 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5640 | { | |
dcd04228 SH |
5641 | return bs->aio_context; |
5642 | } | |
5643 | ||
5644 | void bdrv_detach_aio_context(BlockDriverState *bs) | |
5645 | { | |
5646 | if (!bs->drv) { | |
5647 | return; | |
5648 | } | |
5649 | ||
13af91eb SH |
5650 | if (bs->io_limits_enabled) { |
5651 | throttle_detach_aio_context(&bs->throttle_state); | |
5652 | } | |
dcd04228 SH |
5653 | if (bs->drv->bdrv_detach_aio_context) { |
5654 | bs->drv->bdrv_detach_aio_context(bs); | |
5655 | } | |
5656 | if (bs->file) { | |
5657 | bdrv_detach_aio_context(bs->file); | |
5658 | } | |
5659 | if (bs->backing_hd) { | |
5660 | bdrv_detach_aio_context(bs->backing_hd); | |
5661 | } | |
5662 | ||
5663 | bs->aio_context = NULL; | |
5664 | } | |
5665 | ||
5666 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
5667 | AioContext *new_context) | |
5668 | { | |
5669 | if (!bs->drv) { | |
5670 | return; | |
5671 | } | |
5672 | ||
5673 | bs->aio_context = new_context; | |
5674 | ||
5675 | if (bs->backing_hd) { | |
5676 | bdrv_attach_aio_context(bs->backing_hd, new_context); | |
5677 | } | |
5678 | if (bs->file) { | |
5679 | bdrv_attach_aio_context(bs->file, new_context); | |
5680 | } | |
5681 | if (bs->drv->bdrv_attach_aio_context) { | |
5682 | bs->drv->bdrv_attach_aio_context(bs, new_context); | |
5683 | } | |
13af91eb SH |
5684 | if (bs->io_limits_enabled) { |
5685 | throttle_attach_aio_context(&bs->throttle_state, new_context); | |
5686 | } | |
dcd04228 SH |
5687 | } |
5688 | ||
5689 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) | |
5690 | { | |
5691 | bdrv_drain_all(); /* ensure there are no in-flight requests */ | |
5692 | ||
5693 | bdrv_detach_aio_context(bs); | |
5694 | ||
5695 | /* This function executes in the old AioContext so acquire the new one in | |
5696 | * case it runs in a different thread. | |
5697 | */ | |
5698 | aio_context_acquire(new_context); | |
5699 | bdrv_attach_aio_context(bs, new_context); | |
5700 | aio_context_release(new_context); | |
85d126f3 | 5701 | } |
d616b224 SH |
5702 | |
5703 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
5704 | NotifierWithReturn *notifier) | |
5705 | { | |
5706 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5707 | } | |
6f176b48 | 5708 | |
c282e1fd | 5709 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts) |
6f176b48 | 5710 | { |
c282e1fd | 5711 | if (!bs->drv->bdrv_amend_options) { |
6f176b48 HR |
5712 | return -ENOTSUP; |
5713 | } | |
c282e1fd | 5714 | return bs->drv->bdrv_amend_options(bs, opts); |
6f176b48 | 5715 | } |
f6186f49 | 5716 | |
b5042a36 BC |
5717 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
5718 | * of block filter and by bdrv_is_first_non_filter. | |
5719 | * It is used to test if the given bs is the candidate or recurse more in the | |
5720 | * node graph. | |
212a5a8f | 5721 | */ |
b5042a36 | 5722 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 5723 | BlockDriverState *candidate) |
f6186f49 | 5724 | { |
b5042a36 BC |
5725 | /* return false if basic checks fails */ |
5726 | if (!bs || !bs->drv) { | |
212a5a8f | 5727 | return false; |
f6186f49 BC |
5728 | } |
5729 | ||
b5042a36 BC |
5730 | /* the code reached a non block filter driver -> check if the bs is |
5731 | * the same as the candidate. It's the recursion termination condition. | |
5732 | */ | |
5733 | if (!bs->drv->is_filter) { | |
5734 | return bs == candidate; | |
212a5a8f | 5735 | } |
b5042a36 | 5736 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 5737 | |
b5042a36 BC |
5738 | /* If the block filter recursion method is defined use it to recurse down |
5739 | * the node graph. | |
5740 | */ | |
5741 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 5742 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5743 | } |
5744 | ||
b5042a36 BC |
5745 | /* the driver is a block filter but don't allow to recurse -> return false |
5746 | */ | |
5747 | return false; | |
f6186f49 BC |
5748 | } |
5749 | ||
212a5a8f BC |
5750 | /* This function checks if the candidate is the first non filter bs down it's |
5751 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5752 | * from the top. Some filters can choose not to pass down the recursion. | |
5753 | */ | |
5754 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5755 | { |
212a5a8f BC |
5756 | BlockDriverState *bs; |
5757 | ||
5758 | /* walk down the bs forest recursively */ | |
5759 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5760 | bool perm; | |
5761 | ||
b5042a36 | 5762 | /* try to recurse in this top level bs */ |
e6dc8a1f | 5763 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
5764 | |
5765 | /* candidate is the first non filter */ | |
5766 | if (perm) { | |
5767 | return true; | |
5768 | } | |
5769 | } | |
5770 | ||
5771 | return false; | |
f6186f49 | 5772 | } |
09158f00 BC |
5773 | |
5774 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) | |
5775 | { | |
5776 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5777 | if (!to_replace_bs) { | |
5778 | error_setg(errp, "Node name '%s' not found", node_name); | |
5779 | return NULL; | |
5780 | } | |
5781 | ||
5782 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { | |
5783 | return NULL; | |
5784 | } | |
5785 | ||
5786 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
5787 | * most non filter in order to prevent data corruption. | |
5788 | * Another benefit is that this tests exclude backing files which are | |
5789 | * blocked by the backing blockers. | |
5790 | */ | |
5791 | if (!bdrv_is_first_non_filter(to_replace_bs)) { | |
5792 | error_setg(errp, "Only top most non filter can be replaced"); | |
5793 | return NULL; | |
5794 | } | |
5795 | ||
5796 | return to_replace_bs; | |
5797 | } | |
448ad91d ML |
5798 | |
5799 | void bdrv_io_plug(BlockDriverState *bs) | |
5800 | { | |
5801 | BlockDriver *drv = bs->drv; | |
5802 | if (drv && drv->bdrv_io_plug) { | |
5803 | drv->bdrv_io_plug(bs); | |
5804 | } else if (bs->file) { | |
5805 | bdrv_io_plug(bs->file); | |
5806 | } | |
5807 | } | |
5808 | ||
5809 | void bdrv_io_unplug(BlockDriverState *bs) | |
5810 | { | |
5811 | BlockDriver *drv = bs->drv; | |
5812 | if (drv && drv->bdrv_io_unplug) { | |
5813 | drv->bdrv_io_unplug(bs); | |
5814 | } else if (bs->file) { | |
5815 | bdrv_io_unplug(bs->file); | |
5816 | } | |
5817 | } | |
5818 | ||
5819 | void bdrv_flush_io_queue(BlockDriverState *bs) | |
5820 | { | |
5821 | BlockDriver *drv = bs->drv; | |
5822 | if (drv && drv->bdrv_flush_io_queue) { | |
5823 | drv->bdrv_flush_io_queue(bs); | |
5824 | } else if (bs->file) { | |
5825 | bdrv_flush_io_queue(bs->file); | |
5826 | } | |
5827 | } |