]>
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" |
bfb197e0 | 31 | #include "sysemu/block-backend.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
c13163fb | 35 | #include "block/qapi.h" |
b2023818 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
a5ee7bd4 | 38 | #include "qapi-event.h" |
fc01f7e7 | 39 | |
71e72a19 | 40 | #ifdef CONFIG_BSD |
7674e7bf FB |
41 | #include <sys/types.h> |
42 | #include <sys/stat.h> | |
43 | #include <sys/ioctl.h> | |
72cf2d4f | 44 | #include <sys/queue.h> |
c5e97233 | 45 | #ifndef __DragonFly__ |
7674e7bf FB |
46 | #include <sys/disk.h> |
47 | #endif | |
c5e97233 | 48 | #endif |
7674e7bf | 49 | |
49dc768d AL |
50 | #ifdef _WIN32 |
51 | #include <windows.h> | |
52 | #endif | |
53 | ||
e4654d2d FZ |
54 | struct BdrvDirtyBitmap { |
55 | HBitmap *bitmap; | |
56 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
57 | }; | |
58 | ||
1c9805a3 SH |
59 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
60 | ||
7c84b1b8 | 61 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
f141eafe | 62 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 63 | BlockCompletionFunc *cb, void *opaque); |
7c84b1b8 | 64 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
f141eafe | 65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 66 | BlockCompletionFunc *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); |
7c84b1b8 MA |
79 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
80 | int64_t sector_num, | |
81 | QEMUIOVector *qiov, | |
82 | int nb_sectors, | |
83 | BdrvRequestFlags flags, | |
097310b5 | 84 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
85 | void *opaque, |
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 | |
c4237dfa VSO |
100 | static void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
101 | int nr_sectors); | |
102 | static void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
103 | int nr_sectors); | |
eb852011 MA |
104 | /* If non-zero, use only whitelisted block drivers */ |
105 | static int use_bdrv_whitelist; | |
106 | ||
9e0b22f4 SH |
107 | #ifdef _WIN32 |
108 | static int is_windows_drive_prefix(const char *filename) | |
109 | { | |
110 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
111 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
112 | filename[1] == ':'); | |
113 | } | |
114 | ||
115 | int is_windows_drive(const char *filename) | |
116 | { | |
117 | if (is_windows_drive_prefix(filename) && | |
118 | filename[2] == '\0') | |
119 | return 1; | |
120 | if (strstart(filename, "\\\\.\\", NULL) || | |
121 | strstart(filename, "//./", NULL)) | |
122 | return 1; | |
123 | return 0; | |
124 | } | |
125 | #endif | |
126 | ||
0563e191 | 127 | /* throttling disk I/O limits */ |
cc0681c4 BC |
128 | void bdrv_set_io_limits(BlockDriverState *bs, |
129 | ThrottleConfig *cfg) | |
98f90dba | 130 | { |
cc0681c4 | 131 | int i; |
98f90dba | 132 | |
cc0681c4 | 133 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 134 | |
cc0681c4 BC |
135 | for (i = 0; i < 2; i++) { |
136 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 137 | } |
cc0681c4 BC |
138 | } |
139 | ||
140 | /* this function drain all the throttled IOs */ | |
141 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
142 | { | |
143 | bool drained = false; | |
144 | bool enabled = bs->io_limits_enabled; | |
145 | int i; | |
146 | ||
147 | bs->io_limits_enabled = false; | |
148 | ||
149 | for (i = 0; i < 2; i++) { | |
150 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
151 | drained = true; | |
152 | } | |
153 | } | |
154 | ||
155 | bs->io_limits_enabled = enabled; | |
98f90dba | 156 | |
cc0681c4 | 157 | return drained; |
98f90dba ZYW |
158 | } |
159 | ||
cc0681c4 | 160 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 161 | { |
cc0681c4 | 162 | bs->io_limits_enabled = false; |
0563e191 | 163 | |
cc0681c4 BC |
164 | bdrv_start_throttled_reqs(bs); |
165 | ||
166 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
167 | } |
168 | ||
cc0681c4 | 169 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 170 | { |
cc0681c4 BC |
171 | BlockDriverState *bs = opaque; |
172 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
173 | } |
174 | ||
cc0681c4 | 175 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 176 | { |
cc0681c4 BC |
177 | BlockDriverState *bs = opaque; |
178 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
179 | } |
180 | ||
cc0681c4 BC |
181 | /* should be called before bdrv_set_io_limits if a limit is set */ |
182 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
183 | { | |
184 | assert(!bs->io_limits_enabled); | |
185 | throttle_init(&bs->throttle_state, | |
13af91eb | 186 | bdrv_get_aio_context(bs), |
cc0681c4 BC |
187 | QEMU_CLOCK_VIRTUAL, |
188 | bdrv_throttle_read_timer_cb, | |
189 | bdrv_throttle_write_timer_cb, | |
190 | bs); | |
191 | bs->io_limits_enabled = true; | |
192 | } | |
193 | ||
194 | /* This function makes an IO wait if needed | |
195 | * | |
196 | * @nb_sectors: the number of sectors of the IO | |
197 | * @is_write: is the IO a write | |
198 | */ | |
98f90dba | 199 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 200 | unsigned int bytes, |
cc0681c4 | 201 | bool is_write) |
98f90dba | 202 | { |
cc0681c4 BC |
203 | /* does this io must wait */ |
204 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 205 | |
cc0681c4 BC |
206 | /* if must wait or any request of this type throttled queue the IO */ |
207 | if (must_wait || | |
208 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
209 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
210 | } |
211 | ||
cc0681c4 | 212 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
213 | throttle_account(&bs->throttle_state, is_write, bytes); |
214 | ||
98f90dba | 215 | |
cc0681c4 BC |
216 | /* if the next request must wait -> do nothing */ |
217 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
218 | return; | |
98f90dba ZYW |
219 | } |
220 | ||
cc0681c4 BC |
221 | /* else queue next request for execution */ |
222 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
223 | } |
224 | ||
339064d5 KW |
225 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
226 | { | |
227 | if (!bs || !bs->drv) { | |
228 | /* 4k should be on the safe side */ | |
229 | return 4096; | |
230 | } | |
231 | ||
232 | return bs->bl.opt_mem_alignment; | |
233 | } | |
234 | ||
9e0b22f4 | 235 | /* check if the path starts with "<protocol>:" */ |
5c98415b | 236 | int path_has_protocol(const char *path) |
9e0b22f4 | 237 | { |
947995c0 PB |
238 | const char *p; |
239 | ||
9e0b22f4 SH |
240 | #ifdef _WIN32 |
241 | if (is_windows_drive(path) || | |
242 | is_windows_drive_prefix(path)) { | |
243 | return 0; | |
244 | } | |
947995c0 PB |
245 | p = path + strcspn(path, ":/\\"); |
246 | #else | |
247 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
248 | #endif |
249 | ||
947995c0 | 250 | return *p == ':'; |
9e0b22f4 SH |
251 | } |
252 | ||
83f64091 | 253 | int path_is_absolute(const char *path) |
3b0d4f61 | 254 | { |
21664424 FB |
255 | #ifdef _WIN32 |
256 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 257 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 258 | return 1; |
f53f4da9 PB |
259 | } |
260 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 261 | #else |
f53f4da9 | 262 | return (*path == '/'); |
3b9f94e1 | 263 | #endif |
3b0d4f61 FB |
264 | } |
265 | ||
83f64091 FB |
266 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
267 | path to it by considering it is relative to base_path. URL are | |
268 | supported. */ | |
269 | void path_combine(char *dest, int dest_size, | |
270 | const char *base_path, | |
271 | const char *filename) | |
3b0d4f61 | 272 | { |
83f64091 FB |
273 | const char *p, *p1; |
274 | int len; | |
275 | ||
276 | if (dest_size <= 0) | |
277 | return; | |
278 | if (path_is_absolute(filename)) { | |
279 | pstrcpy(dest, dest_size, filename); | |
280 | } else { | |
281 | p = strchr(base_path, ':'); | |
282 | if (p) | |
283 | p++; | |
284 | else | |
285 | p = base_path; | |
3b9f94e1 FB |
286 | p1 = strrchr(base_path, '/'); |
287 | #ifdef _WIN32 | |
288 | { | |
289 | const char *p2; | |
290 | p2 = strrchr(base_path, '\\'); | |
291 | if (!p1 || p2 > p1) | |
292 | p1 = p2; | |
293 | } | |
294 | #endif | |
83f64091 FB |
295 | if (p1) |
296 | p1++; | |
297 | else | |
298 | p1 = base_path; | |
299 | if (p1 > p) | |
300 | p = p1; | |
301 | len = p - base_path; | |
302 | if (len > dest_size - 1) | |
303 | len = dest_size - 1; | |
304 | memcpy(dest, base_path, len); | |
305 | dest[len] = '\0'; | |
306 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 307 | } |
3b0d4f61 FB |
308 | } |
309 | ||
0a82855a HR |
310 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
311 | const char *backing, | |
9f07429e HR |
312 | char *dest, size_t sz, |
313 | Error **errp) | |
dc5a1371 | 314 | { |
9f07429e HR |
315 | if (backing[0] == '\0' || path_has_protocol(backing) || |
316 | path_is_absolute(backing)) | |
317 | { | |
0a82855a | 318 | pstrcpy(dest, sz, backing); |
9f07429e HR |
319 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
320 | error_setg(errp, "Cannot use relative backing file names for '%s'", | |
321 | backed); | |
dc5a1371 | 322 | } else { |
0a82855a | 323 | path_combine(dest, sz, backed, backing); |
dc5a1371 PB |
324 | } |
325 | } | |
326 | ||
9f07429e HR |
327 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
328 | Error **errp) | |
0a82855a | 329 | { |
9f07429e HR |
330 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
331 | ||
332 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, | |
333 | dest, sz, errp); | |
0a82855a HR |
334 | } |
335 | ||
5efa9d5a | 336 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 337 | { |
8c5873d6 SH |
338 | /* Block drivers without coroutine functions need emulation */ |
339 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
340 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
341 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
342 | ||
f8c35c1d SH |
343 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
344 | * the block driver lacks aio we need to emulate that too. | |
345 | */ | |
f9f05dc5 KW |
346 | if (!bdrv->bdrv_aio_readv) { |
347 | /* add AIO emulation layer */ | |
348 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
349 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 350 | } |
83f64091 | 351 | } |
b2e12bc6 | 352 | |
8a22f02a | 353 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 354 | } |
b338082b | 355 | |
7f06d47e | 356 | BlockDriverState *bdrv_new_root(void) |
b338082b | 357 | { |
7f06d47e | 358 | BlockDriverState *bs = bdrv_new(); |
e4e9986b | 359 | |
e4e9986b | 360 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
e4e9986b MA |
361 | return bs; |
362 | } | |
363 | ||
364 | BlockDriverState *bdrv_new(void) | |
365 | { | |
366 | BlockDriverState *bs; | |
367 | int i; | |
368 | ||
5839e53b | 369 | bs = g_new0(BlockDriverState, 1); |
e4654d2d | 370 | QLIST_INIT(&bs->dirty_bitmaps); |
fbe40ff7 FZ |
371 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
372 | QLIST_INIT(&bs->op_blockers[i]); | |
373 | } | |
28a7282a | 374 | bdrv_iostatus_disable(bs); |
d7d512f6 | 375 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 376 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
377 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
378 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 379 | bs->refcnt = 1; |
dcd04228 | 380 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 381 | |
b338082b FB |
382 | return bs; |
383 | } | |
384 | ||
d7d512f6 PB |
385 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
386 | { | |
387 | notifier_list_add(&bs->close_notifiers, notify); | |
388 | } | |
389 | ||
ea2384d3 FB |
390 | BlockDriver *bdrv_find_format(const char *format_name) |
391 | { | |
392 | BlockDriver *drv1; | |
8a22f02a SH |
393 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
394 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 395 | return drv1; |
8a22f02a | 396 | } |
ea2384d3 FB |
397 | } |
398 | return NULL; | |
399 | } | |
400 | ||
b64ec4e4 | 401 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 402 | { |
b64ec4e4 FZ |
403 | static const char *whitelist_rw[] = { |
404 | CONFIG_BDRV_RW_WHITELIST | |
405 | }; | |
406 | static const char *whitelist_ro[] = { | |
407 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
408 | }; |
409 | const char **p; | |
410 | ||
b64ec4e4 | 411 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 412 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 413 | } |
eb852011 | 414 | |
b64ec4e4 | 415 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
416 | if (!strcmp(drv->format_name, *p)) { |
417 | return 1; | |
418 | } | |
419 | } | |
b64ec4e4 FZ |
420 | if (read_only) { |
421 | for (p = whitelist_ro; *p; p++) { | |
422 | if (!strcmp(drv->format_name, *p)) { | |
423 | return 1; | |
424 | } | |
425 | } | |
426 | } | |
eb852011 MA |
427 | return 0; |
428 | } | |
429 | ||
b64ec4e4 FZ |
430 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
431 | bool read_only) | |
eb852011 MA |
432 | { |
433 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 434 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
435 | } |
436 | ||
5b7e1542 ZYW |
437 | typedef struct CreateCo { |
438 | BlockDriver *drv; | |
439 | char *filename; | |
83d0521a | 440 | QemuOpts *opts; |
5b7e1542 | 441 | int ret; |
cc84d90f | 442 | Error *err; |
5b7e1542 ZYW |
443 | } CreateCo; |
444 | ||
445 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
446 | { | |
cc84d90f HR |
447 | Error *local_err = NULL; |
448 | int ret; | |
449 | ||
5b7e1542 ZYW |
450 | CreateCo *cco = opaque; |
451 | assert(cco->drv); | |
452 | ||
c282e1fd | 453 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
84d18f06 | 454 | if (local_err) { |
cc84d90f HR |
455 | error_propagate(&cco->err, local_err); |
456 | } | |
457 | cco->ret = ret; | |
5b7e1542 ZYW |
458 | } |
459 | ||
0e7e1989 | 460 | int bdrv_create(BlockDriver *drv, const char* filename, |
83d0521a | 461 | QemuOpts *opts, Error **errp) |
ea2384d3 | 462 | { |
5b7e1542 ZYW |
463 | int ret; |
464 | ||
465 | Coroutine *co; | |
466 | CreateCo cco = { | |
467 | .drv = drv, | |
468 | .filename = g_strdup(filename), | |
83d0521a | 469 | .opts = opts, |
5b7e1542 | 470 | .ret = NOT_DONE, |
cc84d90f | 471 | .err = NULL, |
5b7e1542 ZYW |
472 | }; |
473 | ||
c282e1fd | 474 | if (!drv->bdrv_create) { |
cc84d90f | 475 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
476 | ret = -ENOTSUP; |
477 | goto out; | |
5b7e1542 ZYW |
478 | } |
479 | ||
480 | if (qemu_in_coroutine()) { | |
481 | /* Fast-path if already in coroutine context */ | |
482 | bdrv_create_co_entry(&cco); | |
483 | } else { | |
484 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
485 | qemu_coroutine_enter(co, &cco); | |
486 | while (cco.ret == NOT_DONE) { | |
b47ec2c4 | 487 | aio_poll(qemu_get_aio_context(), true); |
5b7e1542 ZYW |
488 | } |
489 | } | |
490 | ||
491 | ret = cco.ret; | |
cc84d90f | 492 | if (ret < 0) { |
84d18f06 | 493 | if (cco.err) { |
cc84d90f HR |
494 | error_propagate(errp, cco.err); |
495 | } else { | |
496 | error_setg_errno(errp, -ret, "Could not create image"); | |
497 | } | |
498 | } | |
0e7e1989 | 499 | |
80168bff LC |
500 | out: |
501 | g_free(cco.filename); | |
5b7e1542 | 502 | return ret; |
ea2384d3 FB |
503 | } |
504 | ||
c282e1fd | 505 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
84a12e66 CH |
506 | { |
507 | BlockDriver *drv; | |
cc84d90f HR |
508 | Error *local_err = NULL; |
509 | int ret; | |
84a12e66 | 510 | |
b65a5e12 | 511 | drv = bdrv_find_protocol(filename, true, errp); |
84a12e66 | 512 | if (drv == NULL) { |
16905d71 | 513 | return -ENOENT; |
84a12e66 CH |
514 | } |
515 | ||
c282e1fd | 516 | ret = bdrv_create(drv, filename, opts, &local_err); |
84d18f06 | 517 | if (local_err) { |
cc84d90f HR |
518 | error_propagate(errp, local_err); |
519 | } | |
520 | return ret; | |
84a12e66 CH |
521 | } |
522 | ||
3baca891 | 523 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd KW |
524 | { |
525 | BlockDriver *drv = bs->drv; | |
3baca891 | 526 | Error *local_err = NULL; |
d34682cd KW |
527 | |
528 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
529 | ||
466ad822 | 530 | if (!drv) { |
3baca891 | 531 | return; |
466ad822 KW |
532 | } |
533 | ||
534 | /* Take some limits from the children as a default */ | |
535 | if (bs->file) { | |
3baca891 KW |
536 | bdrv_refresh_limits(bs->file, &local_err); |
537 | if (local_err) { | |
538 | error_propagate(errp, local_err); | |
539 | return; | |
540 | } | |
466ad822 | 541 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
2647fab5 | 542 | bs->bl.max_transfer_length = bs->file->bl.max_transfer_length; |
339064d5 KW |
543 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
544 | } else { | |
545 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
546 | } |
547 | ||
548 | if (bs->backing_hd) { | |
3baca891 KW |
549 | bdrv_refresh_limits(bs->backing_hd, &local_err); |
550 | if (local_err) { | |
551 | error_propagate(errp, local_err); | |
552 | return; | |
553 | } | |
466ad822 KW |
554 | bs->bl.opt_transfer_length = |
555 | MAX(bs->bl.opt_transfer_length, | |
556 | bs->backing_hd->bl.opt_transfer_length); | |
2647fab5 PL |
557 | bs->bl.max_transfer_length = |
558 | MIN_NON_ZERO(bs->bl.max_transfer_length, | |
559 | bs->backing_hd->bl.max_transfer_length); | |
339064d5 KW |
560 | bs->bl.opt_mem_alignment = |
561 | MAX(bs->bl.opt_mem_alignment, | |
562 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
563 | } |
564 | ||
565 | /* Then let the driver override it */ | |
566 | if (drv->bdrv_refresh_limits) { | |
3baca891 | 567 | drv->bdrv_refresh_limits(bs, errp); |
d34682cd | 568 | } |
d34682cd KW |
569 | } |
570 | ||
eba25057 JM |
571 | /* |
572 | * Create a uniquely-named empty temporary file. | |
573 | * Return 0 upon success, otherwise a negative errno value. | |
574 | */ | |
575 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 576 | { |
eba25057 | 577 | #ifdef _WIN32 |
3b9f94e1 | 578 | char temp_dir[MAX_PATH]; |
eba25057 JM |
579 | /* GetTempFileName requires that its output buffer (4th param) |
580 | have length MAX_PATH or greater. */ | |
581 | assert(size >= MAX_PATH); | |
582 | return (GetTempPath(MAX_PATH, temp_dir) | |
583 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
584 | ? 0 : -GetLastError()); | |
d5249393 | 585 | #else |
67b915a5 | 586 | int fd; |
7ccfb2eb | 587 | const char *tmpdir; |
0badc1ee | 588 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
589 | if (!tmpdir) { |
590 | tmpdir = "/var/tmp"; | |
591 | } | |
eba25057 JM |
592 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
593 | return -EOVERFLOW; | |
594 | } | |
ea2384d3 | 595 | fd = mkstemp(filename); |
fe235a06 DH |
596 | if (fd < 0) { |
597 | return -errno; | |
598 | } | |
599 | if (close(fd) != 0) { | |
600 | unlink(filename); | |
eba25057 JM |
601 | return -errno; |
602 | } | |
603 | return 0; | |
d5249393 | 604 | #endif |
eba25057 | 605 | } |
fc01f7e7 | 606 | |
84a12e66 CH |
607 | /* |
608 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
609 | * recognized as a host CDROM. | |
610 | */ | |
611 | static BlockDriver *find_hdev_driver(const char *filename) | |
612 | { | |
613 | int score_max = 0, score; | |
614 | BlockDriver *drv = NULL, *d; | |
615 | ||
616 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
617 | if (d->bdrv_probe_device) { | |
618 | score = d->bdrv_probe_device(filename); | |
619 | if (score > score_max) { | |
620 | score_max = score; | |
621 | drv = d; | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
626 | return drv; | |
627 | } | |
628 | ||
98289620 | 629 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
630 | bool allow_protocol_prefix, |
631 | Error **errp) | |
83f64091 FB |
632 | { |
633 | BlockDriver *drv1; | |
634 | char protocol[128]; | |
1cec71e3 | 635 | int len; |
83f64091 | 636 | const char *p; |
19cb3738 | 637 | |
66f82cee KW |
638 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
639 | ||
39508e7a CH |
640 | /* |
641 | * XXX(hch): we really should not let host device detection | |
642 | * override an explicit protocol specification, but moving this | |
643 | * later breaks access to device names with colons in them. | |
644 | * Thanks to the brain-dead persistent naming schemes on udev- | |
645 | * based Linux systems those actually are quite common. | |
646 | */ | |
647 | drv1 = find_hdev_driver(filename); | |
648 | if (drv1) { | |
649 | return drv1; | |
650 | } | |
651 | ||
98289620 | 652 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
ef810437 | 653 | return &bdrv_file; |
84a12e66 | 654 | } |
98289620 | 655 | |
9e0b22f4 SH |
656 | p = strchr(filename, ':'); |
657 | assert(p != NULL); | |
1cec71e3 AL |
658 | len = p - filename; |
659 | if (len > sizeof(protocol) - 1) | |
660 | len = sizeof(protocol) - 1; | |
661 | memcpy(protocol, filename, len); | |
662 | protocol[len] = '\0'; | |
8a22f02a | 663 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 664 | if (drv1->protocol_name && |
8a22f02a | 665 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 666 | return drv1; |
8a22f02a | 667 | } |
83f64091 | 668 | } |
b65a5e12 HR |
669 | |
670 | error_setg(errp, "Unknown protocol '%s'", protocol); | |
83f64091 FB |
671 | return NULL; |
672 | } | |
673 | ||
c6684249 MA |
674 | /* |
675 | * Guess image format by probing its contents. | |
676 | * This is not a good idea when your image is raw (CVE-2008-2004), but | |
677 | * we do it anyway for backward compatibility. | |
678 | * | |
679 | * @buf contains the image's first @buf_size bytes. | |
7cddd372 KW |
680 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
681 | * but can be smaller if the image file is smaller) | |
c6684249 MA |
682 | * @filename is its filename. |
683 | * | |
684 | * For all block drivers, call the bdrv_probe() method to get its | |
685 | * probing score. | |
686 | * Return the first block driver with the highest probing score. | |
687 | */ | |
38f3ef57 KW |
688 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
689 | const char *filename) | |
c6684249 MA |
690 | { |
691 | int score_max = 0, score; | |
692 | BlockDriver *drv = NULL, *d; | |
693 | ||
694 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
695 | if (d->bdrv_probe) { | |
696 | score = d->bdrv_probe(buf, buf_size, filename); | |
697 | if (score > score_max) { | |
698 | score_max = score; | |
699 | drv = d; | |
700 | } | |
701 | } | |
702 | } | |
703 | ||
704 | return drv; | |
705 | } | |
706 | ||
f500a6d3 | 707 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 708 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 709 | { |
c6684249 | 710 | BlockDriver *drv; |
7cddd372 | 711 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
f500a6d3 | 712 | int ret = 0; |
f8ea0b00 | 713 | |
08a00559 | 714 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 715 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
ef810437 | 716 | *pdrv = &bdrv_raw; |
c98ac35d | 717 | return ret; |
1a396859 | 718 | } |
f8ea0b00 | 719 | |
83f64091 | 720 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 721 | if (ret < 0) { |
34b5d2c6 HR |
722 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
723 | "format"); | |
c98ac35d SW |
724 | *pdrv = NULL; |
725 | return ret; | |
83f64091 FB |
726 | } |
727 | ||
c6684249 | 728 | drv = bdrv_probe_all(buf, ret, filename); |
c98ac35d | 729 | if (!drv) { |
34b5d2c6 HR |
730 | error_setg(errp, "Could not determine image format: No compatible " |
731 | "driver found"); | |
c98ac35d SW |
732 | ret = -ENOENT; |
733 | } | |
734 | *pdrv = drv; | |
735 | return ret; | |
ea2384d3 FB |
736 | } |
737 | ||
51762288 SH |
738 | /** |
739 | * Set the current 'total_sectors' value | |
65a9bb25 | 740 | * Return 0 on success, -errno on error. |
51762288 SH |
741 | */ |
742 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
743 | { | |
744 | BlockDriver *drv = bs->drv; | |
745 | ||
396759ad NB |
746 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
747 | if (bs->sg) | |
748 | return 0; | |
749 | ||
51762288 SH |
750 | /* query actual device if possible, otherwise just trust the hint */ |
751 | if (drv->bdrv_getlength) { | |
752 | int64_t length = drv->bdrv_getlength(bs); | |
753 | if (length < 0) { | |
754 | return length; | |
755 | } | |
7e382003 | 756 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
757 | } |
758 | ||
759 | bs->total_sectors = hint; | |
760 | return 0; | |
761 | } | |
762 | ||
9e8f1835 PB |
763 | /** |
764 | * Set open flags for a given discard mode | |
765 | * | |
766 | * Return 0 on success, -1 if the discard mode was invalid. | |
767 | */ | |
768 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
769 | { | |
770 | *flags &= ~BDRV_O_UNMAP; | |
771 | ||
772 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
773 | /* do nothing */ | |
774 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
775 | *flags |= BDRV_O_UNMAP; | |
776 | } else { | |
777 | return -1; | |
778 | } | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
c3993cdc SH |
783 | /** |
784 | * Set open flags for a given cache mode | |
785 | * | |
786 | * Return 0 on success, -1 if the cache mode was invalid. | |
787 | */ | |
788 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
789 | { | |
790 | *flags &= ~BDRV_O_CACHE_MASK; | |
791 | ||
792 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
793 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
794 | } else if (!strcmp(mode, "directsync")) { |
795 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
796 | } else if (!strcmp(mode, "writeback")) { |
797 | *flags |= BDRV_O_CACHE_WB; | |
798 | } else if (!strcmp(mode, "unsafe")) { | |
799 | *flags |= BDRV_O_CACHE_WB; | |
800 | *flags |= BDRV_O_NO_FLUSH; | |
801 | } else if (!strcmp(mode, "writethrough")) { | |
802 | /* this is the default */ | |
803 | } else { | |
804 | return -1; | |
805 | } | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
53fec9d3 SH |
810 | /** |
811 | * The copy-on-read flag is actually a reference count so multiple users may | |
812 | * use the feature without worrying about clobbering its previous state. | |
813 | * Copy-on-read stays enabled until all users have called to disable it. | |
814 | */ | |
815 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
816 | { | |
817 | bs->copy_on_read++; | |
818 | } | |
819 | ||
820 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
821 | { | |
822 | assert(bs->copy_on_read > 0); | |
823 | bs->copy_on_read--; | |
824 | } | |
825 | ||
b1e6fc08 KW |
826 | /* |
827 | * Returns the flags that a temporary snapshot should get, based on the | |
828 | * originally requested flags (the originally requested image will have flags | |
829 | * like a backing file) | |
830 | */ | |
831 | static int bdrv_temp_snapshot_flags(int flags) | |
832 | { | |
833 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; | |
834 | } | |
835 | ||
0b50cc88 KW |
836 | /* |
837 | * Returns the flags that bs->file should get, based on the given flags for | |
838 | * the parent BDS | |
839 | */ | |
840 | static int bdrv_inherited_flags(int flags) | |
841 | { | |
842 | /* Enable protocol handling, disable format probing for bs->file */ | |
843 | flags |= BDRV_O_PROTOCOL; | |
844 | ||
845 | /* Our block drivers take care to send flushes and respect unmap policy, | |
846 | * so we can enable both unconditionally on lower layers. */ | |
847 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; | |
848 | ||
0b50cc88 | 849 | /* Clear flags that only apply to the top layer */ |
5669b44d | 850 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
0b50cc88 KW |
851 | |
852 | return flags; | |
853 | } | |
854 | ||
317fc44e KW |
855 | /* |
856 | * Returns the flags that bs->backing_hd should get, based on the given flags | |
857 | * for the parent BDS | |
858 | */ | |
859 | static int bdrv_backing_flags(int flags) | |
860 | { | |
861 | /* backing files always opened read-only */ | |
862 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); | |
863 | ||
864 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 865 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e KW |
866 | |
867 | return flags; | |
868 | } | |
869 | ||
7b272452 KW |
870 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
871 | { | |
872 | int open_flags = flags | BDRV_O_CACHE_WB; | |
873 | ||
874 | /* | |
875 | * Clear flags that are internal to the block layer before opening the | |
876 | * image. | |
877 | */ | |
20cca275 | 878 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 KW |
879 | |
880 | /* | |
881 | * Snapshots should be writable. | |
882 | */ | |
8bfea15d | 883 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
884 | open_flags |= BDRV_O_RDWR; |
885 | } | |
886 | ||
887 | return open_flags; | |
888 | } | |
889 | ||
636ea370 KW |
890 | static void bdrv_assign_node_name(BlockDriverState *bs, |
891 | const char *node_name, | |
892 | Error **errp) | |
6913c0c2 BC |
893 | { |
894 | if (!node_name) { | |
636ea370 | 895 | return; |
6913c0c2 BC |
896 | } |
897 | ||
9aebf3b8 | 898 | /* Check for empty string or invalid characters */ |
f5bebbbb | 899 | if (!id_wellformed(node_name)) { |
9aebf3b8 | 900 | error_setg(errp, "Invalid node name"); |
636ea370 | 901 | return; |
6913c0c2 BC |
902 | } |
903 | ||
0c5e94ee | 904 | /* takes care of avoiding namespaces collisions */ |
7f06d47e | 905 | if (blk_by_name(node_name)) { |
0c5e94ee BC |
906 | error_setg(errp, "node-name=%s is conflicting with a device id", |
907 | node_name); | |
636ea370 | 908 | return; |
0c5e94ee BC |
909 | } |
910 | ||
6913c0c2 BC |
911 | /* takes care of avoiding duplicates node names */ |
912 | if (bdrv_find_node(node_name)) { | |
913 | error_setg(errp, "Duplicate node name"); | |
636ea370 | 914 | return; |
6913c0c2 BC |
915 | } |
916 | ||
917 | /* copy node name into the bs and insert it into the graph list */ | |
918 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
919 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
6913c0c2 BC |
920 | } |
921 | ||
57915332 KW |
922 | /* |
923 | * Common part for opening disk images and files | |
b6ad491a KW |
924 | * |
925 | * Removes all processed options from *options. | |
57915332 | 926 | */ |
f500a6d3 | 927 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 928 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
929 | { |
930 | int ret, open_flags; | |
035fccdf | 931 | const char *filename; |
6913c0c2 | 932 | const char *node_name = NULL; |
34b5d2c6 | 933 | Error *local_err = NULL; |
57915332 KW |
934 | |
935 | assert(drv != NULL); | |
6405875c | 936 | assert(bs->file == NULL); |
707ff828 | 937 | assert(options != NULL && bs->options != options); |
57915332 | 938 | |
45673671 KW |
939 | if (file != NULL) { |
940 | filename = file->filename; | |
941 | } else { | |
942 | filename = qdict_get_try_str(options, "filename"); | |
943 | } | |
944 | ||
765003db KW |
945 | if (drv->bdrv_needs_filename && !filename) { |
946 | error_setg(errp, "The '%s' block driver requires a file name", | |
947 | drv->format_name); | |
948 | return -EINVAL; | |
949 | } | |
950 | ||
45673671 | 951 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 952 | |
6913c0c2 | 953 | node_name = qdict_get_try_str(options, "node-name"); |
636ea370 | 954 | bdrv_assign_node_name(bs, node_name, &local_err); |
0fb6395c | 955 | if (local_err) { |
636ea370 KW |
956 | error_propagate(errp, local_err); |
957 | return -EINVAL; | |
6913c0c2 BC |
958 | } |
959 | qdict_del(options, "node-name"); | |
960 | ||
5d186eb0 KW |
961 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
962 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
963 | * and return immediately. */ | |
964 | if (file != NULL && drv->bdrv_file_open) { | |
965 | bdrv_swap(file, bs); | |
966 | return 0; | |
967 | } | |
968 | ||
57915332 | 969 | bs->open_flags = flags; |
1b7fd729 | 970 | bs->guest_block_size = 512; |
c25f53b0 | 971 | bs->request_alignment = 512; |
0d51b4de | 972 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
973 | open_flags = bdrv_open_flags(bs, flags); |
974 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
975 | ||
976 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
977 | error_setg(errp, |
978 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
979 | ? "Driver '%s' can only be used for read-only devices" | |
980 | : "Driver '%s' is not whitelisted", | |
981 | drv->format_name); | |
b64ec4e4 FZ |
982 | return -ENOTSUP; |
983 | } | |
57915332 | 984 | |
53fec9d3 | 985 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
986 | if (flags & BDRV_O_COPY_ON_READ) { |
987 | if (!bs->read_only) { | |
988 | bdrv_enable_copy_on_read(bs); | |
989 | } else { | |
990 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
991 | return -EINVAL; | |
992 | } | |
53fec9d3 SH |
993 | } |
994 | ||
c2ad1b0c KW |
995 | if (filename != NULL) { |
996 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
997 | } else { | |
998 | bs->filename[0] = '\0'; | |
999 | } | |
91af7014 | 1000 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
57915332 | 1001 | |
57915332 | 1002 | bs->drv = drv; |
7267c094 | 1003 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 1004 | |
03f541bd | 1005 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 1006 | |
66f82cee KW |
1007 | /* Open the image, either directly or using a protocol */ |
1008 | if (drv->bdrv_file_open) { | |
5d186eb0 | 1009 | assert(file == NULL); |
030be321 | 1010 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 1011 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 1012 | } else { |
2af5ef70 | 1013 | if (file == NULL) { |
34b5d2c6 HR |
1014 | error_setg(errp, "Can't use '%s' as a block driver for the " |
1015 | "protocol level", drv->format_name); | |
2af5ef70 KW |
1016 | ret = -EINVAL; |
1017 | goto free_and_fail; | |
1018 | } | |
f500a6d3 | 1019 | bs->file = file; |
34b5d2c6 | 1020 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
1021 | } |
1022 | ||
57915332 | 1023 | if (ret < 0) { |
84d18f06 | 1024 | if (local_err) { |
34b5d2c6 | 1025 | error_propagate(errp, local_err); |
2fa9aa59 DH |
1026 | } else if (bs->filename[0]) { |
1027 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
1028 | } else { |
1029 | error_setg_errno(errp, -ret, "Could not open image"); | |
1030 | } | |
57915332 KW |
1031 | goto free_and_fail; |
1032 | } | |
1033 | ||
51762288 SH |
1034 | ret = refresh_total_sectors(bs, bs->total_sectors); |
1035 | if (ret < 0) { | |
34b5d2c6 | 1036 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 1037 | goto free_and_fail; |
57915332 | 1038 | } |
51762288 | 1039 | |
3baca891 KW |
1040 | bdrv_refresh_limits(bs, &local_err); |
1041 | if (local_err) { | |
1042 | error_propagate(errp, local_err); | |
1043 | ret = -EINVAL; | |
1044 | goto free_and_fail; | |
1045 | } | |
1046 | ||
c25f53b0 | 1047 | assert(bdrv_opt_mem_align(bs) != 0); |
47ea2de2 | 1048 | assert((bs->request_alignment != 0) || bs->sg); |
57915332 KW |
1049 | return 0; |
1050 | ||
1051 | free_and_fail: | |
f500a6d3 | 1052 | bs->file = NULL; |
7267c094 | 1053 | g_free(bs->opaque); |
57915332 KW |
1054 | bs->opaque = NULL; |
1055 | bs->drv = NULL; | |
1056 | return ret; | |
1057 | } | |
1058 | ||
5e5c4f63 KW |
1059 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1060 | { | |
1061 | QObject *options_obj; | |
1062 | QDict *options; | |
1063 | int ret; | |
1064 | ||
1065 | ret = strstart(filename, "json:", &filename); | |
1066 | assert(ret); | |
1067 | ||
1068 | options_obj = qobject_from_json(filename); | |
1069 | if (!options_obj) { | |
1070 | error_setg(errp, "Could not parse the JSON options"); | |
1071 | return NULL; | |
1072 | } | |
1073 | ||
1074 | if (qobject_type(options_obj) != QTYPE_QDICT) { | |
1075 | qobject_decref(options_obj); | |
1076 | error_setg(errp, "Invalid JSON object given"); | |
1077 | return NULL; | |
1078 | } | |
1079 | ||
1080 | options = qobject_to_qdict(options_obj); | |
1081 | qdict_flatten(options); | |
1082 | ||
1083 | return options; | |
1084 | } | |
1085 | ||
b6ce07aa | 1086 | /* |
f54120ff KW |
1087 | * Fills in default options for opening images and converts the legacy |
1088 | * filename/flags pair to option QDict entries. | |
b6ce07aa | 1089 | */ |
5e5c4f63 | 1090 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
17b005f1 | 1091 | BlockDriver *drv, Error **errp) |
ea2384d3 | 1092 | { |
5e5c4f63 | 1093 | const char *filename = *pfilename; |
c2ad1b0c | 1094 | const char *drvname; |
462f5bcf | 1095 | bool protocol = flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 1096 | bool parse_filename = false; |
34b5d2c6 | 1097 | Error *local_err = NULL; |
83f64091 | 1098 | |
5e5c4f63 KW |
1099 | /* Parse json: pseudo-protocol */ |
1100 | if (filename && g_str_has_prefix(filename, "json:")) { | |
1101 | QDict *json_options = parse_json_filename(filename, &local_err); | |
1102 | if (local_err) { | |
1103 | error_propagate(errp, local_err); | |
1104 | return -EINVAL; | |
1105 | } | |
1106 | ||
1107 | /* Options given in the filename have lower priority than options | |
1108 | * specified directly */ | |
1109 | qdict_join(*options, json_options, false); | |
1110 | QDECREF(json_options); | |
1111 | *pfilename = filename = NULL; | |
1112 | } | |
1113 | ||
035fccdf | 1114 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 1115 | if (protocol && filename) { |
f54120ff KW |
1116 | if (!qdict_haskey(*options, "filename")) { |
1117 | qdict_put(*options, "filename", qstring_from_str(filename)); | |
1118 | parse_filename = true; | |
1119 | } else { | |
1120 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
1121 | "the same time"); | |
1122 | return -EINVAL; | |
1123 | } | |
035fccdf KW |
1124 | } |
1125 | ||
c2ad1b0c | 1126 | /* Find the right block driver */ |
f54120ff | 1127 | filename = qdict_get_try_str(*options, "filename"); |
5acd9d81 | 1128 | drvname = qdict_get_try_str(*options, "driver"); |
f54120ff | 1129 | |
17b005f1 KW |
1130 | if (drv) { |
1131 | if (drvname) { | |
1132 | error_setg(errp, "Driver specified twice"); | |
1133 | return -EINVAL; | |
1134 | } | |
1135 | drvname = drv->format_name; | |
1136 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1137 | } else { | |
1138 | if (!drvname && protocol) { | |
1139 | if (filename) { | |
b65a5e12 | 1140 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
17b005f1 | 1141 | if (!drv) { |
17b005f1 KW |
1142 | return -EINVAL; |
1143 | } | |
1144 | ||
1145 | drvname = drv->format_name; | |
1146 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1147 | } else { | |
1148 | error_setg(errp, "Must specify either driver or file"); | |
f54120ff KW |
1149 | return -EINVAL; |
1150 | } | |
17b005f1 KW |
1151 | } else if (drvname) { |
1152 | drv = bdrv_find_format(drvname); | |
1153 | if (!drv) { | |
1154 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1155 | return -ENOENT; | |
1156 | } | |
98289620 | 1157 | } |
c2ad1b0c KW |
1158 | } |
1159 | ||
17b005f1 | 1160 | assert(drv || !protocol); |
c2ad1b0c | 1161 | |
f54120ff | 1162 | /* Driver-specific filename parsing */ |
17b005f1 | 1163 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1164 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1165 | if (local_err) { |
34b5d2c6 | 1166 | error_propagate(errp, local_err); |
f54120ff | 1167 | return -EINVAL; |
6963a30d | 1168 | } |
cd5d031e HR |
1169 | |
1170 | if (!drv->bdrv_needs_filename) { | |
1171 | qdict_del(*options, "filename"); | |
cd5d031e | 1172 | } |
6963a30d KW |
1173 | } |
1174 | ||
f54120ff KW |
1175 | return 0; |
1176 | } | |
1177 | ||
8d24cce1 FZ |
1178 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
1179 | { | |
1180 | ||
826b6ca0 FZ |
1181 | if (bs->backing_hd) { |
1182 | assert(bs->backing_blocker); | |
1183 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); | |
1184 | } else if (backing_hd) { | |
1185 | error_setg(&bs->backing_blocker, | |
1186 | "device is used as backing hd of '%s'", | |
bfb197e0 | 1187 | bdrv_get_device_name(bs)); |
826b6ca0 FZ |
1188 | } |
1189 | ||
8d24cce1 FZ |
1190 | bs->backing_hd = backing_hd; |
1191 | if (!backing_hd) { | |
826b6ca0 FZ |
1192 | error_free(bs->backing_blocker); |
1193 | bs->backing_blocker = NULL; | |
8d24cce1 FZ |
1194 | goto out; |
1195 | } | |
1196 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
1197 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); | |
1198 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), | |
1199 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
826b6ca0 FZ |
1200 | |
1201 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); | |
1202 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ | |
bb00021d | 1203 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
826b6ca0 | 1204 | bs->backing_blocker); |
8d24cce1 | 1205 | out: |
3baca891 | 1206 | bdrv_refresh_limits(bs, NULL); |
8d24cce1 FZ |
1207 | } |
1208 | ||
31ca6d07 KW |
1209 | /* |
1210 | * Opens the backing file for a BlockDriverState if not yet open | |
1211 | * | |
1212 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1213 | * empty set of options. The reference to the QDict is transferred to this | |
1214 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1215 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1216 | */ | |
34b5d2c6 | 1217 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 | 1218 | { |
1ba4b6a5 | 1219 | char *backing_filename = g_malloc0(PATH_MAX); |
317fc44e | 1220 | int ret = 0; |
8d24cce1 | 1221 | BlockDriverState *backing_hd; |
34b5d2c6 | 1222 | Error *local_err = NULL; |
9156df12 PB |
1223 | |
1224 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1225 | QDECREF(options); |
1ba4b6a5 | 1226 | goto free_exit; |
9156df12 PB |
1227 | } |
1228 | ||
31ca6d07 KW |
1229 | /* NULL means an empty set of options */ |
1230 | if (options == NULL) { | |
1231 | options = qdict_new(); | |
1232 | } | |
1233 | ||
9156df12 | 1234 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1235 | if (qdict_haskey(options, "file.filename")) { |
1236 | backing_filename[0] = '\0'; | |
1237 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1238 | QDECREF(options); |
1ba4b6a5 | 1239 | goto free_exit; |
dbecebdd | 1240 | } else { |
9f07429e HR |
1241 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
1242 | &local_err); | |
1243 | if (local_err) { | |
1244 | ret = -EINVAL; | |
1245 | error_propagate(errp, local_err); | |
1246 | QDECREF(options); | |
1247 | goto free_exit; | |
1248 | } | |
9156df12 PB |
1249 | } |
1250 | ||
8ee79e70 KW |
1251 | if (!bs->drv || !bs->drv->supports_backing) { |
1252 | ret = -EINVAL; | |
1253 | error_setg(errp, "Driver doesn't support backing files"); | |
1254 | QDECREF(options); | |
1255 | goto free_exit; | |
1256 | } | |
1257 | ||
e4e9986b | 1258 | backing_hd = bdrv_new(); |
8d24cce1 | 1259 | |
c5f6e493 KW |
1260 | if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
1261 | qdict_put(options, "driver", qstring_from_str(bs->backing_format)); | |
9156df12 PB |
1262 | } |
1263 | ||
f67503e5 | 1264 | assert(bs->backing_hd == NULL); |
8d24cce1 | 1265 | ret = bdrv_open(&backing_hd, |
ddf5636d | 1266 | *backing_filename ? backing_filename : NULL, NULL, options, |
c5f6e493 | 1267 | bdrv_backing_flags(bs->open_flags), NULL, &local_err); |
9156df12 | 1268 | if (ret < 0) { |
8d24cce1 FZ |
1269 | bdrv_unref(backing_hd); |
1270 | backing_hd = NULL; | |
9156df12 | 1271 | bs->open_flags |= BDRV_O_NO_BACKING; |
b04b6b6e FZ |
1272 | error_setg(errp, "Could not open backing file: %s", |
1273 | error_get_pretty(local_err)); | |
1274 | error_free(local_err); | |
1ba4b6a5 | 1275 | goto free_exit; |
9156df12 | 1276 | } |
8d24cce1 | 1277 | bdrv_set_backing_hd(bs, backing_hd); |
d80ac658 | 1278 | |
1ba4b6a5 BC |
1279 | free_exit: |
1280 | g_free(backing_filename); | |
1281 | return ret; | |
9156df12 PB |
1282 | } |
1283 | ||
da557aac HR |
1284 | /* |
1285 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1286 | * device's options. | |
1287 | * | |
da557aac HR |
1288 | * If allow_none is true, no image will be opened if filename is false and no |
1289 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1290 | * | |
1291 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1292 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1293 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1294 | * BlockdevRef. | |
1295 | * | |
1296 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1297 | * |
1298 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1299 | */ |
1300 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1301 | QDict *options, const char *bdref_key, int flags, | |
f7d9fd8c | 1302 | bool allow_none, Error **errp) |
da557aac HR |
1303 | { |
1304 | QDict *image_options; | |
1305 | int ret; | |
1306 | char *bdref_key_dot; | |
1307 | const char *reference; | |
1308 | ||
f67503e5 HR |
1309 | assert(pbs); |
1310 | assert(*pbs == NULL); | |
1311 | ||
da557aac HR |
1312 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1313 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1314 | g_free(bdref_key_dot); | |
1315 | ||
1316 | reference = qdict_get_try_str(options, bdref_key); | |
1317 | if (!filename && !reference && !qdict_size(image_options)) { | |
1318 | if (allow_none) { | |
1319 | ret = 0; | |
1320 | } else { | |
1321 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1322 | bdref_key); | |
1323 | ret = -EINVAL; | |
1324 | } | |
b20e61e0 | 1325 | QDECREF(image_options); |
da557aac HR |
1326 | goto done; |
1327 | } | |
1328 | ||
f7d9fd8c | 1329 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
da557aac HR |
1330 | |
1331 | done: | |
1332 | qdict_del(options, bdref_key); | |
1333 | return ret; | |
1334 | } | |
1335 | ||
6b8aeca5 | 1336 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
b998875d KW |
1337 | { |
1338 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 1339 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d | 1340 | int64_t total_size; |
83d0521a | 1341 | QemuOpts *opts = NULL; |
b998875d KW |
1342 | QDict *snapshot_options; |
1343 | BlockDriverState *bs_snapshot; | |
1344 | Error *local_err; | |
1345 | int ret; | |
1346 | ||
1347 | /* if snapshot, we create a temporary backing file and open it | |
1348 | instead of opening 'filename' directly */ | |
1349 | ||
1350 | /* Get the required size from the image */ | |
f187743a KW |
1351 | total_size = bdrv_getlength(bs); |
1352 | if (total_size < 0) { | |
6b8aeca5 | 1353 | ret = total_size; |
f187743a | 1354 | error_setg_errno(errp, -total_size, "Could not get image size"); |
1ba4b6a5 | 1355 | goto out; |
f187743a | 1356 | } |
b998875d KW |
1357 | |
1358 | /* Create the temporary image */ | |
1ba4b6a5 | 1359 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
1360 | if (ret < 0) { |
1361 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 1362 | goto out; |
b998875d KW |
1363 | } |
1364 | ||
ef810437 | 1365 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
c282e1fd | 1366 | &error_abort); |
39101f25 | 1367 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
ef810437 | 1368 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, &local_err); |
83d0521a | 1369 | qemu_opts_del(opts); |
b998875d KW |
1370 | if (ret < 0) { |
1371 | error_setg_errno(errp, -ret, "Could not create temporary overlay " | |
1372 | "'%s': %s", tmp_filename, | |
1373 | error_get_pretty(local_err)); | |
1374 | error_free(local_err); | |
1ba4b6a5 | 1375 | goto out; |
b998875d KW |
1376 | } |
1377 | ||
1378 | /* Prepare a new options QDict for the temporary file */ | |
1379 | snapshot_options = qdict_new(); | |
1380 | qdict_put(snapshot_options, "file.driver", | |
1381 | qstring_from_str("file")); | |
1382 | qdict_put(snapshot_options, "file.filename", | |
1383 | qstring_from_str(tmp_filename)); | |
1384 | ||
e4e9986b | 1385 | bs_snapshot = bdrv_new(); |
b998875d KW |
1386 | |
1387 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, | |
ef810437 | 1388 | flags, &bdrv_qcow2, &local_err); |
b998875d KW |
1389 | if (ret < 0) { |
1390 | error_propagate(errp, local_err); | |
1ba4b6a5 | 1391 | goto out; |
b998875d KW |
1392 | } |
1393 | ||
1394 | bdrv_append(bs_snapshot, bs); | |
1ba4b6a5 BC |
1395 | |
1396 | out: | |
1397 | g_free(tmp_filename); | |
6b8aeca5 | 1398 | return ret; |
b998875d KW |
1399 | } |
1400 | ||
b6ce07aa KW |
1401 | /* |
1402 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1403 | * |
1404 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1405 | * empty set of options. The reference to the QDict belongs to the block layer | |
1406 | * after the call (even on failure), so if the caller intends to reuse the | |
1407 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1408 | * |
1409 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1410 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1411 | * |
1412 | * The reference parameter may be used to specify an existing block device which | |
1413 | * should be opened. If specified, neither options nor a filename may be given, | |
1414 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1415 | */ |
ddf5636d HR |
1416 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1417 | const char *reference, QDict *options, int flags, | |
1418 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1419 | { |
b6ce07aa | 1420 | int ret; |
f67503e5 | 1421 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1422 | const char *drvname; |
34b5d2c6 | 1423 | Error *local_err = NULL; |
b1e6fc08 | 1424 | int snapshot_flags = 0; |
712e7874 | 1425 | |
f67503e5 HR |
1426 | assert(pbs); |
1427 | ||
ddf5636d HR |
1428 | if (reference) { |
1429 | bool options_non_empty = options ? qdict_size(options) : false; | |
1430 | QDECREF(options); | |
1431 | ||
1432 | if (*pbs) { | |
1433 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1434 | "another block device"); | |
1435 | return -EINVAL; | |
1436 | } | |
1437 | ||
1438 | if (filename || options_non_empty) { | |
1439 | error_setg(errp, "Cannot reference an existing block device with " | |
1440 | "additional options or a new filename"); | |
1441 | return -EINVAL; | |
1442 | } | |
1443 | ||
1444 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1445 | if (!bs) { | |
1446 | return -ENODEV; | |
1447 | } | |
1448 | bdrv_ref(bs); | |
1449 | *pbs = bs; | |
1450 | return 0; | |
1451 | } | |
1452 | ||
f67503e5 HR |
1453 | if (*pbs) { |
1454 | bs = *pbs; | |
1455 | } else { | |
e4e9986b | 1456 | bs = bdrv_new(); |
f67503e5 HR |
1457 | } |
1458 | ||
de9c0cec KW |
1459 | /* NULL means an empty set of options */ |
1460 | if (options == NULL) { | |
1461 | options = qdict_new(); | |
1462 | } | |
1463 | ||
17b005f1 | 1464 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
462f5bcf KW |
1465 | if (local_err) { |
1466 | goto fail; | |
1467 | } | |
1468 | ||
76c591b0 KW |
1469 | /* Find the right image format driver */ |
1470 | drv = NULL; | |
1471 | drvname = qdict_get_try_str(options, "driver"); | |
1472 | if (drvname) { | |
1473 | drv = bdrv_find_format(drvname); | |
1474 | qdict_del(options, "driver"); | |
1475 | if (!drv) { | |
1476 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
1477 | ret = -EINVAL; | |
1478 | goto fail; | |
1479 | } | |
1480 | } | |
1481 | ||
1482 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
1483 | if (drv && !drv->bdrv_file_open) { | |
1484 | /* If the user explicitly wants a format driver here, we'll need to add | |
1485 | * another layer for the protocol in bs->file */ | |
1486 | flags &= ~BDRV_O_PROTOCOL; | |
1487 | } | |
1488 | ||
de9c0cec | 1489 | bs->options = options; |
b6ad491a | 1490 | options = qdict_clone_shallow(options); |
de9c0cec | 1491 | |
f500a6d3 | 1492 | /* Open image file without format layer */ |
f4788adc KW |
1493 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
1494 | if (flags & BDRV_O_RDWR) { | |
1495 | flags |= BDRV_O_ALLOW_RDWR; | |
1496 | } | |
1497 | if (flags & BDRV_O_SNAPSHOT) { | |
1498 | snapshot_flags = bdrv_temp_snapshot_flags(flags); | |
1499 | flags = bdrv_backing_flags(flags); | |
1500 | } | |
f500a6d3 | 1501 | |
f4788adc KW |
1502 | assert(file == NULL); |
1503 | ret = bdrv_open_image(&file, filename, options, "file", | |
1504 | bdrv_inherited_flags(flags), | |
1505 | true, &local_err); | |
1506 | if (ret < 0) { | |
1507 | goto fail; | |
1508 | } | |
f500a6d3 KW |
1509 | } |
1510 | ||
76c591b0 | 1511 | /* Image format probing */ |
38f3ef57 | 1512 | bs->probed = !drv; |
76c591b0 | 1513 | if (!drv && file) { |
17b005f1 KW |
1514 | ret = find_image_format(file, filename, &drv, &local_err); |
1515 | if (ret < 0) { | |
8bfea15d | 1516 | goto fail; |
2a05cbe4 | 1517 | } |
76c591b0 | 1518 | } else if (!drv) { |
17b005f1 KW |
1519 | error_setg(errp, "Must specify either driver or file"); |
1520 | ret = -EINVAL; | |
8bfea15d | 1521 | goto fail; |
ea2384d3 | 1522 | } |
b6ce07aa KW |
1523 | |
1524 | /* Open the image */ | |
34b5d2c6 | 1525 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1526 | if (ret < 0) { |
8bfea15d | 1527 | goto fail; |
6987307c CH |
1528 | } |
1529 | ||
2a05cbe4 | 1530 | if (file && (bs->file != file)) { |
4f6fd349 | 1531 | bdrv_unref(file); |
f500a6d3 KW |
1532 | file = NULL; |
1533 | } | |
1534 | ||
b6ce07aa | 1535 | /* If there is a backing file, use it */ |
9156df12 | 1536 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1537 | QDict *backing_options; |
1538 | ||
5726d872 | 1539 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1540 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1541 | if (ret < 0) { |
b6ad491a | 1542 | goto close_and_fail; |
b6ce07aa | 1543 | } |
b6ce07aa KW |
1544 | } |
1545 | ||
91af7014 HR |
1546 | bdrv_refresh_filename(bs); |
1547 | ||
b998875d KW |
1548 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
1549 | * temporary snapshot afterwards. */ | |
b1e6fc08 | 1550 | if (snapshot_flags) { |
6b8aeca5 | 1551 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
b998875d | 1552 | if (local_err) { |
b998875d KW |
1553 | goto close_and_fail; |
1554 | } | |
1555 | } | |
1556 | ||
b6ad491a | 1557 | /* Check if any unknown options were used */ |
5acd9d81 | 1558 | if (options && (qdict_size(options) != 0)) { |
b6ad491a | 1559 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
1560 | if (flags & BDRV_O_PROTOCOL) { |
1561 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
1562 | "'%s'", drv->format_name, entry->key); | |
1563 | } else { | |
1564 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " | |
1565 | "support the option '%s'", drv->format_name, | |
bfb197e0 | 1566 | bdrv_get_device_name(bs), entry->key); |
5acd9d81 | 1567 | } |
b6ad491a KW |
1568 | |
1569 | ret = -EINVAL; | |
1570 | goto close_and_fail; | |
1571 | } | |
b6ad491a | 1572 | |
b6ce07aa | 1573 | if (!bdrv_key_required(bs)) { |
a7f53e26 MA |
1574 | if (bs->blk) { |
1575 | blk_dev_change_media_cb(bs->blk, true); | |
1576 | } | |
c3adb58f MA |
1577 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
1578 | && !runstate_check(RUN_STATE_INMIGRATE) | |
1579 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ | |
1580 | error_setg(errp, | |
1581 | "Guest must be stopped for opening of encrypted image"); | |
1582 | ret = -EBUSY; | |
1583 | goto close_and_fail; | |
b6ce07aa KW |
1584 | } |
1585 | ||
c3adb58f | 1586 | QDECREF(options); |
f67503e5 | 1587 | *pbs = bs; |
b6ce07aa KW |
1588 | return 0; |
1589 | ||
8bfea15d | 1590 | fail: |
f500a6d3 | 1591 | if (file != NULL) { |
4f6fd349 | 1592 | bdrv_unref(file); |
f500a6d3 | 1593 | } |
de9c0cec | 1594 | QDECREF(bs->options); |
b6ad491a | 1595 | QDECREF(options); |
de9c0cec | 1596 | bs->options = NULL; |
f67503e5 HR |
1597 | if (!*pbs) { |
1598 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1599 | needs to be freed now. Otherwise, it does not need to be closed, | |
1600 | since it has not really been opened yet. */ | |
1601 | bdrv_unref(bs); | |
1602 | } | |
84d18f06 | 1603 | if (local_err) { |
34b5d2c6 HR |
1604 | error_propagate(errp, local_err); |
1605 | } | |
b6ad491a | 1606 | return ret; |
de9c0cec | 1607 | |
b6ad491a | 1608 | close_and_fail: |
f67503e5 HR |
1609 | /* See fail path, but now the BDS has to be always closed */ |
1610 | if (*pbs) { | |
1611 | bdrv_close(bs); | |
1612 | } else { | |
1613 | bdrv_unref(bs); | |
1614 | } | |
b6ad491a | 1615 | QDECREF(options); |
84d18f06 | 1616 | if (local_err) { |
34b5d2c6 HR |
1617 | error_propagate(errp, local_err); |
1618 | } | |
b6ce07aa KW |
1619 | return ret; |
1620 | } | |
1621 | ||
e971aa12 JC |
1622 | typedef struct BlockReopenQueueEntry { |
1623 | bool prepared; | |
1624 | BDRVReopenState state; | |
1625 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1626 | } BlockReopenQueueEntry; | |
1627 | ||
1628 | /* | |
1629 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1630 | * reopen of multiple devices. | |
1631 | * | |
1632 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1633 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1634 | * be created and initialized. This newly created BlockReopenQueue should be | |
1635 | * passed back in for subsequent calls that are intended to be of the same | |
1636 | * atomic 'set'. | |
1637 | * | |
1638 | * bs is the BlockDriverState to add to the reopen queue. | |
1639 | * | |
1640 | * flags contains the open flags for the associated bs | |
1641 | * | |
1642 | * returns a pointer to bs_queue, which is either the newly allocated | |
1643 | * bs_queue, or the existing bs_queue being used. | |
1644 | * | |
1645 | */ | |
1646 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1647 | BlockDriverState *bs, int flags) | |
1648 | { | |
1649 | assert(bs != NULL); | |
1650 | ||
1651 | BlockReopenQueueEntry *bs_entry; | |
1652 | if (bs_queue == NULL) { | |
1653 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1654 | QSIMPLEQ_INIT(bs_queue); | |
1655 | } | |
1656 | ||
f1f25a2e KW |
1657 | /* bdrv_open() masks this flag out */ |
1658 | flags &= ~BDRV_O_PROTOCOL; | |
1659 | ||
e971aa12 | 1660 | if (bs->file) { |
f1f25a2e | 1661 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
e971aa12 JC |
1662 | } |
1663 | ||
1664 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1665 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1666 | ||
1667 | bs_entry->state.bs = bs; | |
1668 | bs_entry->state.flags = flags; | |
1669 | ||
1670 | return bs_queue; | |
1671 | } | |
1672 | ||
1673 | /* | |
1674 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1675 | * | |
1676 | * The queue passed in (bs_queue) must have been built up previous | |
1677 | * via bdrv_reopen_queue(). | |
1678 | * | |
1679 | * Reopens all BDS specified in the queue, with the appropriate | |
1680 | * flags. All devices are prepared for reopen, and failure of any | |
1681 | * device will cause all device changes to be abandonded, and intermediate | |
1682 | * data cleaned up. | |
1683 | * | |
1684 | * If all devices prepare successfully, then the changes are committed | |
1685 | * to all devices. | |
1686 | * | |
1687 | */ | |
1688 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1689 | { | |
1690 | int ret = -1; | |
1691 | BlockReopenQueueEntry *bs_entry, *next; | |
1692 | Error *local_err = NULL; | |
1693 | ||
1694 | assert(bs_queue != NULL); | |
1695 | ||
1696 | bdrv_drain_all(); | |
1697 | ||
1698 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1699 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1700 | error_propagate(errp, local_err); | |
1701 | goto cleanup; | |
1702 | } | |
1703 | bs_entry->prepared = true; | |
1704 | } | |
1705 | ||
1706 | /* If we reach this point, we have success and just need to apply the | |
1707 | * changes | |
1708 | */ | |
1709 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1710 | bdrv_reopen_commit(&bs_entry->state); | |
1711 | } | |
1712 | ||
1713 | ret = 0; | |
1714 | ||
1715 | cleanup: | |
1716 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1717 | if (ret && bs_entry->prepared) { | |
1718 | bdrv_reopen_abort(&bs_entry->state); | |
1719 | } | |
1720 | g_free(bs_entry); | |
1721 | } | |
1722 | g_free(bs_queue); | |
1723 | return ret; | |
1724 | } | |
1725 | ||
1726 | ||
1727 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1728 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1729 | { | |
1730 | int ret = -1; | |
1731 | Error *local_err = NULL; | |
1732 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1733 | ||
1734 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1735 | if (local_err != NULL) { | |
1736 | error_propagate(errp, local_err); | |
1737 | } | |
1738 | return ret; | |
1739 | } | |
1740 | ||
1741 | ||
1742 | /* | |
1743 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1744 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1745 | * the block driver layer .bdrv_reopen_prepare() | |
1746 | * | |
1747 | * bs is the BlockDriverState to reopen | |
1748 | * flags are the new open flags | |
1749 | * queue is the reopen queue | |
1750 | * | |
1751 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1752 | * as well. | |
1753 | * | |
1754 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1755 | * It is the responsibility of the caller to then call the abort() or | |
1756 | * commit() for any other BDS that have been left in a prepare() state | |
1757 | * | |
1758 | */ | |
1759 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1760 | Error **errp) | |
1761 | { | |
1762 | int ret = -1; | |
1763 | Error *local_err = NULL; | |
1764 | BlockDriver *drv; | |
1765 | ||
1766 | assert(reopen_state != NULL); | |
1767 | assert(reopen_state->bs->drv != NULL); | |
1768 | drv = reopen_state->bs->drv; | |
1769 | ||
1770 | /* if we are to stay read-only, do not allow permission change | |
1771 | * to r/w */ | |
1772 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1773 | reopen_state->flags & BDRV_O_RDWR) { | |
1774 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
bfb197e0 | 1775 | bdrv_get_device_name(reopen_state->bs)); |
e971aa12 JC |
1776 | goto error; |
1777 | } | |
1778 | ||
1779 | ||
1780 | ret = bdrv_flush(reopen_state->bs); | |
1781 | if (ret) { | |
1782 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1783 | strerror(-ret)); | |
1784 | goto error; | |
1785 | } | |
1786 | ||
1787 | if (drv->bdrv_reopen_prepare) { | |
1788 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1789 | if (ret) { | |
1790 | if (local_err != NULL) { | |
1791 | error_propagate(errp, local_err); | |
1792 | } else { | |
d8b6895f LC |
1793 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1794 | reopen_state->bs->filename); | |
e971aa12 JC |
1795 | } |
1796 | goto error; | |
1797 | } | |
1798 | } else { | |
1799 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1800 | * handler for each supported drv. */ | |
1801 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
bfb197e0 | 1802 | drv->format_name, bdrv_get_device_name(reopen_state->bs), |
e971aa12 JC |
1803 | "reopening of file"); |
1804 | ret = -1; | |
1805 | goto error; | |
1806 | } | |
1807 | ||
1808 | ret = 0; | |
1809 | ||
1810 | error: | |
1811 | return ret; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1816 | * makes them final by swapping the staging BlockDriverState contents into | |
1817 | * the active BlockDriverState contents. | |
1818 | */ | |
1819 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1820 | { | |
1821 | BlockDriver *drv; | |
1822 | ||
1823 | assert(reopen_state != NULL); | |
1824 | drv = reopen_state->bs->drv; | |
1825 | assert(drv != NULL); | |
1826 | ||
1827 | /* If there are any driver level actions to take */ | |
1828 | if (drv->bdrv_reopen_commit) { | |
1829 | drv->bdrv_reopen_commit(reopen_state); | |
1830 | } | |
1831 | ||
1832 | /* set BDS specific flags now */ | |
1833 | reopen_state->bs->open_flags = reopen_state->flags; | |
1834 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1835 | BDRV_O_CACHE_WB); | |
1836 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac | 1837 | |
3baca891 | 1838 | bdrv_refresh_limits(reopen_state->bs, NULL); |
e971aa12 JC |
1839 | } |
1840 | ||
1841 | /* | |
1842 | * Abort the reopen, and delete and free the staged changes in | |
1843 | * reopen_state | |
1844 | */ | |
1845 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1846 | { | |
1847 | BlockDriver *drv; | |
1848 | ||
1849 | assert(reopen_state != NULL); | |
1850 | drv = reopen_state->bs->drv; | |
1851 | assert(drv != NULL); | |
1852 | ||
1853 | if (drv->bdrv_reopen_abort) { | |
1854 | drv->bdrv_reopen_abort(reopen_state); | |
1855 | } | |
1856 | } | |
1857 | ||
1858 | ||
fc01f7e7 FB |
1859 | void bdrv_close(BlockDriverState *bs) |
1860 | { | |
33384421 HR |
1861 | BdrvAioNotifier *ban, *ban_next; |
1862 | ||
3cbc002c PB |
1863 | if (bs->job) { |
1864 | block_job_cancel_sync(bs->job); | |
1865 | } | |
58fda173 SH |
1866 | bdrv_drain_all(); /* complete I/O */ |
1867 | bdrv_flush(bs); | |
1868 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1869 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1870 | |
3cbc002c | 1871 | if (bs->drv) { |
557df6ac | 1872 | if (bs->backing_hd) { |
826b6ca0 FZ |
1873 | BlockDriverState *backing_hd = bs->backing_hd; |
1874 | bdrv_set_backing_hd(bs, NULL); | |
1875 | bdrv_unref(backing_hd); | |
557df6ac | 1876 | } |
ea2384d3 | 1877 | bs->drv->bdrv_close(bs); |
7267c094 | 1878 | g_free(bs->opaque); |
ea2384d3 FB |
1879 | bs->opaque = NULL; |
1880 | bs->drv = NULL; | |
53fec9d3 | 1881 | bs->copy_on_read = 0; |
a275fa42 PB |
1882 | bs->backing_file[0] = '\0'; |
1883 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1884 | bs->total_sectors = 0; |
1885 | bs->encrypted = 0; | |
1886 | bs->valid_key = 0; | |
1887 | bs->sg = 0; | |
0d51b4de | 1888 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1889 | QDECREF(bs->options); |
1890 | bs->options = NULL; | |
91af7014 HR |
1891 | QDECREF(bs->full_open_options); |
1892 | bs->full_open_options = NULL; | |
b338082b | 1893 | |
66f82cee | 1894 | if (bs->file != NULL) { |
4f6fd349 | 1895 | bdrv_unref(bs->file); |
0ac9377d | 1896 | bs->file = NULL; |
66f82cee | 1897 | } |
b338082b | 1898 | } |
98f90dba | 1899 | |
a7f53e26 MA |
1900 | if (bs->blk) { |
1901 | blk_dev_change_media_cb(bs->blk, false); | |
1902 | } | |
9ca11154 | 1903 | |
98f90dba ZYW |
1904 | /*throttling disk I/O limits*/ |
1905 | if (bs->io_limits_enabled) { | |
1906 | bdrv_io_limits_disable(bs); | |
1907 | } | |
33384421 HR |
1908 | |
1909 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
1910 | g_free(ban); | |
1911 | } | |
1912 | QLIST_INIT(&bs->aio_notifiers); | |
b338082b FB |
1913 | } |
1914 | ||
2bc93fed MK |
1915 | void bdrv_close_all(void) |
1916 | { | |
1917 | BlockDriverState *bs; | |
1918 | ||
dc364f4c | 1919 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
1920 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1921 | ||
1922 | aio_context_acquire(aio_context); | |
2bc93fed | 1923 | bdrv_close(bs); |
ed78cda3 | 1924 | aio_context_release(aio_context); |
2bc93fed MK |
1925 | } |
1926 | } | |
1927 | ||
88266f5a SH |
1928 | /* Check if any requests are in-flight (including throttled requests) */ |
1929 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1930 | { | |
1931 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1932 | return true; | |
1933 | } | |
cc0681c4 BC |
1934 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1935 | return true; | |
1936 | } | |
1937 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1938 | return true; |
1939 | } | |
1940 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1941 | return true; | |
1942 | } | |
1943 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1944 | return true; | |
1945 | } | |
1946 | return false; | |
1947 | } | |
1948 | ||
5b98db0a SH |
1949 | static bool bdrv_drain_one(BlockDriverState *bs) |
1950 | { | |
1951 | bool bs_busy; | |
1952 | ||
1953 | bdrv_flush_io_queue(bs); | |
1954 | bdrv_start_throttled_reqs(bs); | |
1955 | bs_busy = bdrv_requests_pending(bs); | |
1956 | bs_busy |= aio_poll(bdrv_get_aio_context(bs), bs_busy); | |
1957 | return bs_busy; | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * Wait for pending requests to complete on a single BlockDriverState subtree | |
1962 | * | |
1963 | * See the warning in bdrv_drain_all(). This function can only be called if | |
1964 | * you are sure nothing can generate I/O because you have op blockers | |
1965 | * installed. | |
1966 | * | |
1967 | * Note that unlike bdrv_drain_all(), the caller must hold the BlockDriverState | |
1968 | * AioContext. | |
1969 | */ | |
1970 | void bdrv_drain(BlockDriverState *bs) | |
1971 | { | |
1972 | while (bdrv_drain_one(bs)) { | |
1973 | /* Keep iterating */ | |
1974 | } | |
1975 | } | |
1976 | ||
922453bc SH |
1977 | /* |
1978 | * Wait for pending requests to complete across all BlockDriverStates | |
1979 | * | |
1980 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1981 | * after calling this function. | |
4c355d53 ZYW |
1982 | * |
1983 | * Note that completion of an asynchronous I/O operation can trigger any | |
1984 | * number of other I/O operations on other devices---for example a coroutine | |
1985 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1986 | * coroutine is complete. Because of this, it is not possible to have a | |
1987 | * function to drain a single device's I/O queue. | |
922453bc SH |
1988 | */ |
1989 | void bdrv_drain_all(void) | |
1990 | { | |
88266f5a SH |
1991 | /* Always run first iteration so any pending completion BHs run */ |
1992 | bool busy = true; | |
922453bc SH |
1993 | BlockDriverState *bs; |
1994 | ||
88266f5a | 1995 | while (busy) { |
9b536adc SH |
1996 | busy = false; |
1997 | ||
dc364f4c | 1998 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
9b536adc | 1999 | AioContext *aio_context = bdrv_get_aio_context(bs); |
9b536adc SH |
2000 | |
2001 | aio_context_acquire(aio_context); | |
5b98db0a | 2002 | busy |= bdrv_drain_one(bs); |
9b536adc | 2003 | aio_context_release(aio_context); |
9b536adc | 2004 | } |
922453bc SH |
2005 | } |
2006 | } | |
2007 | ||
dc364f4c BC |
2008 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
2009 | * graph_bdrv_state list. | |
d22b2f41 RH |
2010 | Also, NULL terminate the device_name to prevent double remove */ |
2011 | void bdrv_make_anon(BlockDriverState *bs) | |
2012 | { | |
bfb197e0 MA |
2013 | /* |
2014 | * Take care to remove bs from bdrv_states only when it's actually | |
2015 | * in it. Note that bs->device_list.tqe_prev is initially null, | |
2016 | * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish | |
2017 | * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by | |
2018 | * resetting it to null on remove. | |
2019 | */ | |
2020 | if (bs->device_list.tqe_prev) { | |
dc364f4c | 2021 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
bfb197e0 | 2022 | bs->device_list.tqe_prev = NULL; |
d22b2f41 | 2023 | } |
dc364f4c BC |
2024 | if (bs->node_name[0] != '\0') { |
2025 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
2026 | } | |
2027 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
2028 | } |
2029 | ||
e023b2e2 PB |
2030 | static void bdrv_rebind(BlockDriverState *bs) |
2031 | { | |
2032 | if (bs->drv && bs->drv->bdrv_rebind) { | |
2033 | bs->drv->bdrv_rebind(bs); | |
2034 | } | |
2035 | } | |
2036 | ||
4ddc07ca PB |
2037 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
2038 | BlockDriverState *bs_src) | |
8802d1fd | 2039 | { |
4ddc07ca | 2040 | /* move some fields that need to stay attached to the device */ |
8802d1fd JC |
2041 | |
2042 | /* dev info */ | |
1b7fd729 | 2043 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 2044 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 2045 | |
4ddc07ca | 2046 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 2047 | |
cc0681c4 BC |
2048 | /* i/o throttled req */ |
2049 | memcpy(&bs_dest->throttle_state, | |
2050 | &bs_src->throttle_state, | |
2051 | sizeof(ThrottleState)); | |
2052 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
2053 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 2054 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 2055 | |
8802d1fd | 2056 | /* r/w error */ |
4ddc07ca PB |
2057 | bs_dest->on_read_error = bs_src->on_read_error; |
2058 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
2059 | |
2060 | /* i/o status */ | |
4ddc07ca PB |
2061 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
2062 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 2063 | |
a9fc4408 | 2064 | /* dirty bitmap */ |
e4654d2d | 2065 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 2066 | |
9fcb0251 FZ |
2067 | /* reference count */ |
2068 | bs_dest->refcnt = bs_src->refcnt; | |
2069 | ||
a9fc4408 | 2070 | /* job */ |
4ddc07ca | 2071 | bs_dest->job = bs_src->job; |
a9fc4408 | 2072 | |
8802d1fd | 2073 | /* keep the same entry in bdrv_states */ |
dc364f4c | 2074 | bs_dest->device_list = bs_src->device_list; |
7e7d56d9 MA |
2075 | bs_dest->blk = bs_src->blk; |
2076 | ||
fbe40ff7 FZ |
2077 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
2078 | sizeof(bs_dest->op_blockers)); | |
4ddc07ca | 2079 | } |
8802d1fd | 2080 | |
4ddc07ca PB |
2081 | /* |
2082 | * Swap bs contents for two image chains while they are live, | |
2083 | * while keeping required fields on the BlockDriverState that is | |
2084 | * actually attached to a device. | |
2085 | * | |
2086 | * This will modify the BlockDriverState fields, and swap contents | |
2087 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
2088 | * | |
bfb197e0 | 2089 | * bs_new must not be attached to a BlockBackend. |
4ddc07ca PB |
2090 | * |
2091 | * This function does not create any image files. | |
2092 | */ | |
2093 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
2094 | { | |
2095 | BlockDriverState tmp; | |
f6801b83 | 2096 | |
90ce8a06 BC |
2097 | /* The code needs to swap the node_name but simply swapping node_list won't |
2098 | * work so first remove the nodes from the graph list, do the swap then | |
2099 | * insert them back if needed. | |
2100 | */ | |
2101 | if (bs_new->node_name[0] != '\0') { | |
2102 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); | |
2103 | } | |
2104 | if (bs_old->node_name[0] != '\0') { | |
2105 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); | |
2106 | } | |
2107 | ||
bfb197e0 | 2108 | /* bs_new must be unattached and shouldn't have anything fancy enabled */ |
7e7d56d9 | 2109 | assert(!bs_new->blk); |
e4654d2d | 2110 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca | 2111 | assert(bs_new->job == NULL); |
4ddc07ca | 2112 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2113 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 2114 | |
4ddc07ca PB |
2115 | tmp = *bs_new; |
2116 | *bs_new = *bs_old; | |
2117 | *bs_old = tmp; | |
a9fc4408 | 2118 | |
4ddc07ca PB |
2119 | /* there are some fields that should not be swapped, move them back */ |
2120 | bdrv_move_feature_fields(&tmp, bs_old); | |
2121 | bdrv_move_feature_fields(bs_old, bs_new); | |
2122 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 2123 | |
bfb197e0 | 2124 | /* bs_new must remain unattached */ |
7e7d56d9 | 2125 | assert(!bs_new->blk); |
4ddc07ca PB |
2126 | |
2127 | /* Check a few fields that should remain attached to the device */ | |
4ddc07ca | 2128 | assert(bs_new->job == NULL); |
4ddc07ca | 2129 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2130 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 | 2131 | |
90ce8a06 BC |
2132 | /* insert the nodes back into the graph node list if needed */ |
2133 | if (bs_new->node_name[0] != '\0') { | |
2134 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); | |
2135 | } | |
2136 | if (bs_old->node_name[0] != '\0') { | |
2137 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); | |
2138 | } | |
2139 | ||
e023b2e2 | 2140 | bdrv_rebind(bs_new); |
4ddc07ca PB |
2141 | bdrv_rebind(bs_old); |
2142 | } | |
2143 | ||
2144 | /* | |
2145 | * Add new bs contents at the top of an image chain while the chain is | |
2146 | * live, while keeping required fields on the top layer. | |
2147 | * | |
2148 | * This will modify the BlockDriverState fields, and swap contents | |
2149 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
2150 | * | |
bfb197e0 | 2151 | * bs_new must not be attached to a BlockBackend. |
4ddc07ca PB |
2152 | * |
2153 | * This function does not create any image files. | |
2154 | */ | |
2155 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
2156 | { | |
2157 | bdrv_swap(bs_new, bs_top); | |
2158 | ||
2159 | /* The contents of 'tmp' will become bs_top, as we are | |
2160 | * swapping bs_new and bs_top contents. */ | |
8d24cce1 | 2161 | bdrv_set_backing_hd(bs_top, bs_new); |
8802d1fd JC |
2162 | } |
2163 | ||
4f6fd349 | 2164 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 2165 | { |
3e914655 | 2166 | assert(!bs->job); |
3718d8ab | 2167 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 2168 | assert(!bs->refcnt); |
e4654d2d | 2169 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 2170 | |
e1b5c52e SH |
2171 | bdrv_close(bs); |
2172 | ||
1b7bdbc1 | 2173 | /* remove from list, if necessary */ |
d22b2f41 | 2174 | bdrv_make_anon(bs); |
34c6f050 | 2175 | |
7267c094 | 2176 | g_free(bs); |
fc01f7e7 FB |
2177 | } |
2178 | ||
e97fc193 AL |
2179 | /* |
2180 | * Run consistency checks on an image | |
2181 | * | |
e076f338 | 2182 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2183 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2184 | * check are stored in res. |
e97fc193 | 2185 | */ |
4534ff54 | 2186 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 | 2187 | { |
908bcd54 HR |
2188 | if (bs->drv == NULL) { |
2189 | return -ENOMEDIUM; | |
2190 | } | |
e97fc193 AL |
2191 | if (bs->drv->bdrv_check == NULL) { |
2192 | return -ENOTSUP; | |
2193 | } | |
2194 | ||
e076f338 | 2195 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2196 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2197 | } |
2198 | ||
8a426614 KW |
2199 | #define COMMIT_BUF_SECTORS 2048 |
2200 | ||
33e3963e FB |
2201 | /* commit COW file into the raw image */ |
2202 | int bdrv_commit(BlockDriverState *bs) | |
2203 | { | |
19cb3738 | 2204 | BlockDriver *drv = bs->drv; |
72706ea4 | 2205 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2206 | int n, ro, open_flags; |
0bce597d | 2207 | int ret = 0; |
72706ea4 | 2208 | uint8_t *buf = NULL; |
33e3963e | 2209 | |
19cb3738 FB |
2210 | if (!drv) |
2211 | return -ENOMEDIUM; | |
6bb45158 | 2212 | |
4dca4b63 NS |
2213 | if (!bs->backing_hd) { |
2214 | return -ENOTSUP; | |
33e3963e FB |
2215 | } |
2216 | ||
bb00021d FZ |
2217 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || |
2218 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { | |
2d3735d3 SH |
2219 | return -EBUSY; |
2220 | } | |
2221 | ||
4dca4b63 | 2222 | ro = bs->backing_hd->read_only; |
4dca4b63 NS |
2223 | open_flags = bs->backing_hd->open_flags; |
2224 | ||
2225 | if (ro) { | |
0bce597d JC |
2226 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2227 | return -EACCES; | |
4dca4b63 | 2228 | } |
ea2384d3 | 2229 | } |
33e3963e | 2230 | |
72706ea4 JC |
2231 | length = bdrv_getlength(bs); |
2232 | if (length < 0) { | |
2233 | ret = length; | |
2234 | goto ro_cleanup; | |
2235 | } | |
2236 | ||
2237 | backing_length = bdrv_getlength(bs->backing_hd); | |
2238 | if (backing_length < 0) { | |
2239 | ret = backing_length; | |
2240 | goto ro_cleanup; | |
2241 | } | |
2242 | ||
2243 | /* If our top snapshot is larger than the backing file image, | |
2244 | * grow the backing file image if possible. If not possible, | |
2245 | * we must return an error */ | |
2246 | if (length > backing_length) { | |
2247 | ret = bdrv_truncate(bs->backing_hd, length); | |
2248 | if (ret < 0) { | |
2249 | goto ro_cleanup; | |
2250 | } | |
2251 | } | |
2252 | ||
2253 | total_sectors = length >> BDRV_SECTOR_BITS; | |
857d4f46 KW |
2254 | |
2255 | /* qemu_try_blockalign() for bs will choose an alignment that works for | |
2256 | * bs->backing_hd as well, so no need to compare the alignment manually. */ | |
2257 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
2258 | if (buf == NULL) { | |
2259 | ret = -ENOMEM; | |
2260 | goto ro_cleanup; | |
2261 | } | |
8a426614 KW |
2262 | |
2263 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2264 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2265 | if (ret < 0) { | |
2266 | goto ro_cleanup; | |
2267 | } | |
2268 | if (ret) { | |
dabfa6cc KW |
2269 | ret = bdrv_read(bs, sector, buf, n); |
2270 | if (ret < 0) { | |
8a426614 KW |
2271 | goto ro_cleanup; |
2272 | } | |
2273 | ||
dabfa6cc KW |
2274 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2275 | if (ret < 0) { | |
8a426614 KW |
2276 | goto ro_cleanup; |
2277 | } | |
ea2384d3 | 2278 | } |
33e3963e | 2279 | } |
95389c86 | 2280 | |
1d44952f CH |
2281 | if (drv->bdrv_make_empty) { |
2282 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2283 | if (ret < 0) { |
2284 | goto ro_cleanup; | |
2285 | } | |
1d44952f CH |
2286 | bdrv_flush(bs); |
2287 | } | |
95389c86 | 2288 | |
3f5075ae CH |
2289 | /* |
2290 | * Make sure all data we wrote to the backing device is actually | |
2291 | * stable on disk. | |
2292 | */ | |
dabfa6cc | 2293 | if (bs->backing_hd) { |
3f5075ae | 2294 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2295 | } |
4dca4b63 | 2296 | |
dabfa6cc | 2297 | ret = 0; |
4dca4b63 | 2298 | ro_cleanup: |
857d4f46 | 2299 | qemu_vfree(buf); |
4dca4b63 NS |
2300 | |
2301 | if (ro) { | |
0bce597d JC |
2302 | /* ignoring error return here */ |
2303 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2304 | } |
2305 | ||
1d44952f | 2306 | return ret; |
33e3963e FB |
2307 | } |
2308 | ||
e8877497 | 2309 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2310 | { |
2311 | BlockDriverState *bs; | |
2312 | ||
dc364f4c | 2313 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
2314 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2315 | ||
2316 | aio_context_acquire(aio_context); | |
272d2d8e JC |
2317 | if (bs->drv && bs->backing_hd) { |
2318 | int ret = bdrv_commit(bs); | |
2319 | if (ret < 0) { | |
ed78cda3 | 2320 | aio_context_release(aio_context); |
272d2d8e JC |
2321 | return ret; |
2322 | } | |
e8877497 | 2323 | } |
ed78cda3 | 2324 | aio_context_release(aio_context); |
6ab4b5ab | 2325 | } |
e8877497 | 2326 | return 0; |
6ab4b5ab MA |
2327 | } |
2328 | ||
dbffbdcf SH |
2329 | /** |
2330 | * Remove an active request from the tracked requests list | |
2331 | * | |
2332 | * This function should be called when a tracked request is completing. | |
2333 | */ | |
2334 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2335 | { | |
2dbafdc0 KW |
2336 | if (req->serialising) { |
2337 | req->bs->serialising_in_flight--; | |
2338 | } | |
2339 | ||
dbffbdcf | 2340 | QLIST_REMOVE(req, list); |
f4658285 | 2341 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2342 | } |
2343 | ||
2344 | /** | |
2345 | * Add an active request to the tracked requests list | |
2346 | */ | |
2347 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2348 | BlockDriverState *bs, | |
793ed47a KW |
2349 | int64_t offset, |
2350 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2351 | { |
2352 | *req = (BdrvTrackedRequest){ | |
2353 | .bs = bs, | |
2dbafdc0 KW |
2354 | .offset = offset, |
2355 | .bytes = bytes, | |
2356 | .is_write = is_write, | |
2357 | .co = qemu_coroutine_self(), | |
2358 | .serialising = false, | |
7327145f KW |
2359 | .overlap_offset = offset, |
2360 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2361 | }; |
2362 | ||
f4658285 SH |
2363 | qemu_co_queue_init(&req->wait_queue); |
2364 | ||
dbffbdcf SH |
2365 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2366 | } | |
2367 | ||
e96126ff | 2368 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2369 | { |
7327145f | 2370 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2371 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2372 | - overlap_offset; | |
7327145f | 2373 | |
2dbafdc0 KW |
2374 | if (!req->serialising) { |
2375 | req->bs->serialising_in_flight++; | |
2376 | req->serialising = true; | |
2377 | } | |
7327145f KW |
2378 | |
2379 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2380 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2381 | } |
2382 | ||
d83947ac SH |
2383 | /** |
2384 | * Round a region to cluster boundaries | |
2385 | */ | |
343bded4 PB |
2386 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2387 | int64_t sector_num, int nb_sectors, | |
2388 | int64_t *cluster_sector_num, | |
2389 | int *cluster_nb_sectors) | |
d83947ac SH |
2390 | { |
2391 | BlockDriverInfo bdi; | |
2392 | ||
2393 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2394 | *cluster_sector_num = sector_num; | |
2395 | *cluster_nb_sectors = nb_sectors; | |
2396 | } else { | |
2397 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2398 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2399 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2400 | nb_sectors, c); | |
2401 | } | |
2402 | } | |
2403 | ||
7327145f | 2404 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2405 | { |
2406 | BlockDriverInfo bdi; | |
7327145f | 2407 | int ret; |
793ed47a | 2408 | |
7327145f KW |
2409 | ret = bdrv_get_info(bs, &bdi); |
2410 | if (ret < 0 || bdi.cluster_size == 0) { | |
2411 | return bs->request_alignment; | |
793ed47a | 2412 | } else { |
7327145f | 2413 | return bdi.cluster_size; |
793ed47a KW |
2414 | } |
2415 | } | |
2416 | ||
f4658285 | 2417 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2418 | int64_t offset, unsigned int bytes) |
2419 | { | |
d83947ac | 2420 | /* aaaa bbbb */ |
7327145f | 2421 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2422 | return false; |
2423 | } | |
2424 | /* bbbb aaaa */ | |
7327145f | 2425 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2426 | return false; |
2427 | } | |
2428 | return true; | |
f4658285 SH |
2429 | } |
2430 | ||
28de2dcd | 2431 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2432 | { |
2dbafdc0 | 2433 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2434 | BdrvTrackedRequest *req; |
2435 | bool retry; | |
28de2dcd | 2436 | bool waited = false; |
f4658285 | 2437 | |
2dbafdc0 | 2438 | if (!bs->serialising_in_flight) { |
28de2dcd | 2439 | return false; |
2dbafdc0 KW |
2440 | } |
2441 | ||
f4658285 SH |
2442 | do { |
2443 | retry = false; | |
2444 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2445 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2446 | continue; |
2447 | } | |
7327145f KW |
2448 | if (tracked_request_overlaps(req, self->overlap_offset, |
2449 | self->overlap_bytes)) | |
2450 | { | |
5f8b6491 SH |
2451 | /* Hitting this means there was a reentrant request, for |
2452 | * example, a block driver issuing nested requests. This must | |
2453 | * never happen since it means deadlock. | |
2454 | */ | |
2455 | assert(qemu_coroutine_self() != req->co); | |
2456 | ||
6460440f KW |
2457 | /* If the request is already (indirectly) waiting for us, or |
2458 | * will wait for us as soon as it wakes up, then just go on | |
2459 | * (instead of producing a deadlock in the former case). */ | |
2460 | if (!req->waiting_for) { | |
2461 | self->waiting_for = req; | |
2462 | qemu_co_queue_wait(&req->wait_queue); | |
2463 | self->waiting_for = NULL; | |
2464 | retry = true; | |
28de2dcd | 2465 | waited = true; |
6460440f KW |
2466 | break; |
2467 | } | |
f4658285 SH |
2468 | } |
2469 | } | |
2470 | } while (retry); | |
28de2dcd KW |
2471 | |
2472 | return waited; | |
f4658285 SH |
2473 | } |
2474 | ||
756e6736 KW |
2475 | /* |
2476 | * Return values: | |
2477 | * 0 - success | |
2478 | * -EINVAL - backing format specified, but no file | |
2479 | * -ENOSPC - can't update the backing file because no space is left in the | |
2480 | * image file header | |
2481 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2482 | */ | |
2483 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2484 | const char *backing_file, const char *backing_fmt) | |
2485 | { | |
2486 | BlockDriver *drv = bs->drv; | |
469ef350 | 2487 | int ret; |
756e6736 | 2488 | |
5f377794 PB |
2489 | /* Backing file format doesn't make sense without a backing file */ |
2490 | if (backing_fmt && !backing_file) { | |
2491 | return -EINVAL; | |
2492 | } | |
2493 | ||
756e6736 | 2494 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2495 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2496 | } else { |
469ef350 | 2497 | ret = -ENOTSUP; |
756e6736 | 2498 | } |
469ef350 PB |
2499 | |
2500 | if (ret == 0) { | |
2501 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2502 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2503 | } | |
2504 | return ret; | |
756e6736 KW |
2505 | } |
2506 | ||
6ebdcee2 JC |
2507 | /* |
2508 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2509 | * | |
2510 | * active is the current topmost image. | |
2511 | * | |
2512 | * Returns NULL if bs is not found in active's image chain, | |
2513 | * or if active == bs. | |
4caf0fcd JC |
2514 | * |
2515 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
2516 | */ |
2517 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2518 | BlockDriverState *bs) | |
2519 | { | |
4caf0fcd JC |
2520 | while (active && bs != active->backing_hd) { |
2521 | active = active->backing_hd; | |
6ebdcee2 JC |
2522 | } |
2523 | ||
4caf0fcd JC |
2524 | return active; |
2525 | } | |
6ebdcee2 | 2526 | |
4caf0fcd JC |
2527 | /* Given a BDS, searches for the base layer. */ |
2528 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
2529 | { | |
2530 | return bdrv_find_overlay(bs, NULL); | |
6ebdcee2 JC |
2531 | } |
2532 | ||
2533 | typedef struct BlkIntermediateStates { | |
2534 | BlockDriverState *bs; | |
2535 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2536 | } BlkIntermediateStates; | |
2537 | ||
2538 | ||
2539 | /* | |
2540 | * Drops images above 'base' up to and including 'top', and sets the image | |
2541 | * above 'top' to have base as its backing file. | |
2542 | * | |
2543 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2544 | * information in 'bs' can be properly updated. | |
2545 | * | |
2546 | * E.g., this will convert the following chain: | |
2547 | * bottom <- base <- intermediate <- top <- active | |
2548 | * | |
2549 | * to | |
2550 | * | |
2551 | * bottom <- base <- active | |
2552 | * | |
2553 | * It is allowed for bottom==base, in which case it converts: | |
2554 | * | |
2555 | * base <- intermediate <- top <- active | |
2556 | * | |
2557 | * to | |
2558 | * | |
2559 | * base <- active | |
2560 | * | |
54e26900 JC |
2561 | * If backing_file_str is non-NULL, it will be used when modifying top's |
2562 | * overlay image metadata. | |
2563 | * | |
6ebdcee2 JC |
2564 | * Error conditions: |
2565 | * if active == top, that is considered an error | |
2566 | * | |
2567 | */ | |
2568 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
54e26900 | 2569 | BlockDriverState *base, const char *backing_file_str) |
6ebdcee2 JC |
2570 | { |
2571 | BlockDriverState *intermediate; | |
2572 | BlockDriverState *base_bs = NULL; | |
2573 | BlockDriverState *new_top_bs = NULL; | |
2574 | BlkIntermediateStates *intermediate_state, *next; | |
2575 | int ret = -EIO; | |
2576 | ||
2577 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2578 | QSIMPLEQ_INIT(&states_to_delete); | |
2579 | ||
2580 | if (!top->drv || !base->drv) { | |
2581 | goto exit; | |
2582 | } | |
2583 | ||
2584 | new_top_bs = bdrv_find_overlay(active, top); | |
2585 | ||
2586 | if (new_top_bs == NULL) { | |
2587 | /* we could not find the image above 'top', this is an error */ | |
2588 | goto exit; | |
2589 | } | |
2590 | ||
2591 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2592 | * to do, no intermediate images */ | |
2593 | if (new_top_bs->backing_hd == base) { | |
2594 | ret = 0; | |
2595 | goto exit; | |
2596 | } | |
2597 | ||
2598 | intermediate = top; | |
2599 | ||
2600 | /* now we will go down through the list, and add each BDS we find | |
2601 | * into our deletion queue, until we hit the 'base' | |
2602 | */ | |
2603 | while (intermediate) { | |
5839e53b | 2604 | intermediate_state = g_new0(BlkIntermediateStates, 1); |
6ebdcee2 JC |
2605 | intermediate_state->bs = intermediate; |
2606 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2607 | ||
2608 | if (intermediate->backing_hd == base) { | |
2609 | base_bs = intermediate->backing_hd; | |
2610 | break; | |
2611 | } | |
2612 | intermediate = intermediate->backing_hd; | |
2613 | } | |
2614 | if (base_bs == NULL) { | |
2615 | /* something went wrong, we did not end at the base. safely | |
2616 | * unravel everything, and exit with error */ | |
2617 | goto exit; | |
2618 | } | |
2619 | ||
2620 | /* success - we can delete the intermediate states, and link top->base */ | |
54e26900 JC |
2621 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
2622 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, | |
6ebdcee2 JC |
2623 | base_bs->drv ? base_bs->drv->format_name : ""); |
2624 | if (ret) { | |
2625 | goto exit; | |
2626 | } | |
920beae1 | 2627 | bdrv_set_backing_hd(new_top_bs, base_bs); |
6ebdcee2 JC |
2628 | |
2629 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2630 | /* so that bdrv_close() does not recursively close the chain */ | |
920beae1 | 2631 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
4f6fd349 | 2632 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2633 | } |
2634 | ret = 0; | |
2635 | ||
2636 | exit: | |
2637 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2638 | g_free(intermediate_state); | |
2639 | } | |
2640 | return ret; | |
2641 | } | |
2642 | ||
2643 | ||
71d0770c AL |
2644 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2645 | size_t size) | |
2646 | { | |
75af1f34 | 2647 | if (size > BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) { |
1dd3a447 KW |
2648 | return -EIO; |
2649 | } | |
2650 | ||
c0191e76 | 2651 | if (!bdrv_is_inserted(bs)) { |
71d0770c | 2652 | return -ENOMEDIUM; |
c0191e76 | 2653 | } |
71d0770c | 2654 | |
c0191e76 | 2655 | if (offset < 0) { |
71d0770c | 2656 | return -EIO; |
c0191e76 | 2657 | } |
71d0770c AL |
2658 | |
2659 | return 0; | |
2660 | } | |
2661 | ||
2662 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2663 | int nb_sectors) | |
2664 | { | |
75af1f34 | 2665 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
8f4754ed KW |
2666 | return -EIO; |
2667 | } | |
2668 | ||
eb5a3165 JS |
2669 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2670 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2671 | } |
2672 | ||
1c9805a3 SH |
2673 | typedef struct RwCo { |
2674 | BlockDriverState *bs; | |
775aa8b6 | 2675 | int64_t offset; |
1c9805a3 SH |
2676 | QEMUIOVector *qiov; |
2677 | bool is_write; | |
2678 | int ret; | |
4105eaaa | 2679 | BdrvRequestFlags flags; |
1c9805a3 SH |
2680 | } RwCo; |
2681 | ||
2682 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2683 | { |
1c9805a3 | 2684 | RwCo *rwco = opaque; |
ea2384d3 | 2685 | |
1c9805a3 | 2686 | if (!rwco->is_write) { |
775aa8b6 KW |
2687 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2688 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2689 | rwco->flags); |
775aa8b6 KW |
2690 | } else { |
2691 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2692 | rwco->qiov->size, rwco->qiov, | |
2693 | rwco->flags); | |
1c9805a3 SH |
2694 | } |
2695 | } | |
e7a8a783 | 2696 | |
1c9805a3 | 2697 | /* |
8d3b1a2d | 2698 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2699 | */ |
775aa8b6 KW |
2700 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2701 | QEMUIOVector *qiov, bool is_write, | |
2702 | BdrvRequestFlags flags) | |
1c9805a3 | 2703 | { |
1c9805a3 SH |
2704 | Coroutine *co; |
2705 | RwCo rwco = { | |
2706 | .bs = bs, | |
775aa8b6 | 2707 | .offset = offset, |
8d3b1a2d | 2708 | .qiov = qiov, |
1c9805a3 SH |
2709 | .is_write = is_write, |
2710 | .ret = NOT_DONE, | |
4105eaaa | 2711 | .flags = flags, |
1c9805a3 | 2712 | }; |
e7a8a783 | 2713 | |
498e386c ZYW |
2714 | /** |
2715 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2716 | * will not fire; so the I/O throttling function has to be disabled here | |
2717 | * if it has been enabled. | |
2718 | */ | |
2719 | if (bs->io_limits_enabled) { | |
2720 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2721 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2722 | bdrv_io_limits_disable(bs); | |
2723 | } | |
2724 | ||
1c9805a3 SH |
2725 | if (qemu_in_coroutine()) { |
2726 | /* Fast-path if already in coroutine context */ | |
2727 | bdrv_rw_co_entry(&rwco); | |
2728 | } else { | |
2572b37a SH |
2729 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2730 | ||
1c9805a3 SH |
2731 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
2732 | qemu_coroutine_enter(co, &rwco); | |
2733 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 2734 | aio_poll(aio_context, true); |
1c9805a3 SH |
2735 | } |
2736 | } | |
2737 | return rwco.ret; | |
2738 | } | |
b338082b | 2739 | |
8d3b1a2d KW |
2740 | /* |
2741 | * Process a synchronous request using coroutines | |
2742 | */ | |
2743 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2744 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2745 | { |
2746 | QEMUIOVector qiov; | |
2747 | struct iovec iov = { | |
2748 | .iov_base = (void *)buf, | |
2749 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2750 | }; | |
2751 | ||
75af1f34 | 2752 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
da15ee51 KW |
2753 | return -EINVAL; |
2754 | } | |
2755 | ||
8d3b1a2d | 2756 | qemu_iovec_init_external(&qiov, &iov, 1); |
775aa8b6 KW |
2757 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2758 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2759 | } |
2760 | ||
1c9805a3 SH |
2761 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2762 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2763 | uint8_t *buf, int nb_sectors) | |
2764 | { | |
4105eaaa | 2765 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2766 | } |
2767 | ||
07d27a44 MA |
2768 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2769 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2770 | uint8_t *buf, int nb_sectors) | |
2771 | { | |
2772 | bool enabled; | |
2773 | int ret; | |
2774 | ||
2775 | enabled = bs->io_limits_enabled; | |
2776 | bs->io_limits_enabled = false; | |
4e7395e8 | 2777 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2778 | bs->io_limits_enabled = enabled; |
2779 | return ret; | |
2780 | } | |
2781 | ||
5fafdf24 | 2782 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2783 | -EIO generic I/O error (may happen for all errors) |
2784 | -ENOMEDIUM No media inserted. | |
2785 | -EINVAL Invalid sector number or nb_sectors | |
2786 | -EACCES Trying to write a read-only device | |
2787 | */ | |
5fafdf24 | 2788 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2789 | const uint8_t *buf, int nb_sectors) |
2790 | { | |
4105eaaa | 2791 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2792 | } |
2793 | ||
aa7bfbff PL |
2794 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2795 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2796 | { |
2797 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2798 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2799 | } |
2800 | ||
d75cbb5e PL |
2801 | /* |
2802 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2803 | * The operation is sped up by checking the block status and only writing | |
2804 | * zeroes to the device if they currently do not return zeroes. Optional | |
2805 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2806 | * | |
2807 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2808 | */ | |
2809 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2810 | { | |
d32f7c10 | 2811 | int64_t target_sectors, ret, nb_sectors, sector_num = 0; |
d75cbb5e PL |
2812 | int n; |
2813 | ||
d32f7c10 MA |
2814 | target_sectors = bdrv_nb_sectors(bs); |
2815 | if (target_sectors < 0) { | |
2816 | return target_sectors; | |
9ce10c0b | 2817 | } |
9ce10c0b | 2818 | |
d75cbb5e | 2819 | for (;;) { |
75af1f34 | 2820 | nb_sectors = MIN(target_sectors - sector_num, BDRV_REQUEST_MAX_SECTORS); |
d75cbb5e PL |
2821 | if (nb_sectors <= 0) { |
2822 | return 0; | |
2823 | } | |
d75cbb5e | 2824 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); |
3d94ce60 PL |
2825 | if (ret < 0) { |
2826 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2827 | sector_num, strerror(-ret)); | |
2828 | return ret; | |
2829 | } | |
d75cbb5e PL |
2830 | if (ret & BDRV_BLOCK_ZERO) { |
2831 | sector_num += n; | |
2832 | continue; | |
2833 | } | |
2834 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2835 | if (ret < 0) { | |
2836 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2837 | sector_num, strerror(-ret)); | |
2838 | return ret; | |
2839 | } | |
2840 | sector_num += n; | |
2841 | } | |
2842 | } | |
2843 | ||
a3ef6571 | 2844 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2845 | { |
a3ef6571 KW |
2846 | QEMUIOVector qiov; |
2847 | struct iovec iov = { | |
2848 | .iov_base = (void *)buf, | |
2849 | .iov_len = bytes, | |
2850 | }; | |
9a8c4cce | 2851 | int ret; |
83f64091 | 2852 | |
a3ef6571 KW |
2853 | if (bytes < 0) { |
2854 | return -EINVAL; | |
83f64091 FB |
2855 | } |
2856 | ||
a3ef6571 KW |
2857 | qemu_iovec_init_external(&qiov, &iov, 1); |
2858 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2859 | if (ret < 0) { | |
2860 | return ret; | |
83f64091 | 2861 | } |
a3ef6571 KW |
2862 | |
2863 | return bytes; | |
83f64091 FB |
2864 | } |
2865 | ||
8d3b1a2d | 2866 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2867 | { |
9a8c4cce | 2868 | int ret; |
83f64091 | 2869 | |
8407d5d7 KW |
2870 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2871 | if (ret < 0) { | |
2872 | return ret; | |
83f64091 FB |
2873 | } |
2874 | ||
8d3b1a2d KW |
2875 | return qiov->size; |
2876 | } | |
2877 | ||
2878 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2879 | const void *buf, int bytes) |
8d3b1a2d KW |
2880 | { |
2881 | QEMUIOVector qiov; | |
2882 | struct iovec iov = { | |
2883 | .iov_base = (void *) buf, | |
8407d5d7 | 2884 | .iov_len = bytes, |
8d3b1a2d KW |
2885 | }; |
2886 | ||
8407d5d7 KW |
2887 | if (bytes < 0) { |
2888 | return -EINVAL; | |
2889 | } | |
2890 | ||
8d3b1a2d KW |
2891 | qemu_iovec_init_external(&qiov, &iov, 1); |
2892 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2893 | } |
83f64091 | 2894 | |
f08145fe KW |
2895 | /* |
2896 | * Writes to the file and ensures that no writes are reordered across this | |
2897 | * request (acts as a barrier) | |
2898 | * | |
2899 | * Returns 0 on success, -errno in error cases. | |
2900 | */ | |
2901 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2902 | const void *buf, int count) | |
2903 | { | |
2904 | int ret; | |
2905 | ||
2906 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2907 | if (ret < 0) { | |
2908 | return ret; | |
2909 | } | |
2910 | ||
f05fa4ad PB |
2911 | /* No flush needed for cache modes that already do it */ |
2912 | if (bs->enable_write_cache) { | |
f08145fe KW |
2913 | bdrv_flush(bs); |
2914 | } | |
2915 | ||
2916 | return 0; | |
2917 | } | |
2918 | ||
470c0504 | 2919 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2920 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2921 | { | |
2922 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2923 | * their read buffer while the operation is in progress do not end up | |
2924 | * modifying the image file. This is critical for zero-copy guest I/O | |
2925 | * where anything might happen inside guest memory. | |
2926 | */ | |
2927 | void *bounce_buffer; | |
2928 | ||
79c053bd | 2929 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2930 | struct iovec iov; |
2931 | QEMUIOVector bounce_qiov; | |
2932 | int64_t cluster_sector_num; | |
2933 | int cluster_nb_sectors; | |
2934 | size_t skip_bytes; | |
2935 | int ret; | |
2936 | ||
2937 | /* Cover entire cluster so no additional backing file I/O is required when | |
2938 | * allocating cluster in the image file. | |
2939 | */ | |
343bded4 PB |
2940 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2941 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2942 | |
470c0504 SH |
2943 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2944 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2945 | |
2946 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
857d4f46 KW |
2947 | iov.iov_base = bounce_buffer = qemu_try_blockalign(bs, iov.iov_len); |
2948 | if (bounce_buffer == NULL) { | |
2949 | ret = -ENOMEM; | |
2950 | goto err; | |
2951 | } | |
2952 | ||
ab185921 SH |
2953 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
2954 | ||
79c053bd SH |
2955 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2956 | &bounce_qiov); | |
ab185921 SH |
2957 | if (ret < 0) { |
2958 | goto err; | |
2959 | } | |
2960 | ||
79c053bd SH |
2961 | if (drv->bdrv_co_write_zeroes && |
2962 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 2963 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 2964 | cluster_nb_sectors, 0); |
79c053bd | 2965 | } else { |
f05fa4ad PB |
2966 | /* This does not change the data on the disk, it is not necessary |
2967 | * to flush even in cache=writethrough mode. | |
2968 | */ | |
79c053bd | 2969 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2970 | &bounce_qiov); |
79c053bd SH |
2971 | } |
2972 | ||
ab185921 SH |
2973 | if (ret < 0) { |
2974 | /* It might be okay to ignore write errors for guest requests. If this | |
2975 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2976 | * Simply report it in all cases. | |
2977 | */ | |
2978 | goto err; | |
2979 | } | |
2980 | ||
2981 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2982 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2983 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2984 | |
2985 | err: | |
2986 | qemu_vfree(bounce_buffer); | |
2987 | return ret; | |
2988 | } | |
2989 | ||
c5fbe571 | 2990 | /* |
d0c7f642 KW |
2991 | * Forwards an already correctly aligned request to the BlockDriver. This |
2992 | * handles copy on read and zeroing after EOF; any other features must be | |
2993 | * implemented by the caller. | |
c5fbe571 | 2994 | */ |
d0c7f642 | 2995 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 2996 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 2997 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
2998 | { |
2999 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3000 | int ret; |
da1fa91d | 3001 | |
d0c7f642 KW |
3002 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3003 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 3004 | |
d0c7f642 KW |
3005 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3006 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3007 | assert(!qiov || bytes == qiov->size); |
d0c7f642 KW |
3008 | |
3009 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 3010 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
3011 | /* If we touch the same cluster it counts as an overlap. This |
3012 | * guarantees that allocating writes will be serialized and not race | |
3013 | * with each other for the same cluster. For example, in copy-on-read | |
3014 | * it ensures that the CoR read and write operations are atomic and | |
3015 | * guest writes cannot interleave between them. */ | |
3016 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
3017 | } |
3018 | ||
2dbafdc0 | 3019 | wait_serialising_requests(req); |
f4658285 | 3020 | |
470c0504 | 3021 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
3022 | int pnum; |
3023 | ||
bdad13b9 | 3024 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
3025 | if (ret < 0) { |
3026 | goto out; | |
3027 | } | |
3028 | ||
3029 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 3030 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
3031 | goto out; |
3032 | } | |
3033 | } | |
3034 | ||
d0c7f642 | 3035 | /* Forward the request to the BlockDriver */ |
c0191e76 | 3036 | if (!bs->zero_beyond_eof) { |
893a8f62 MK |
3037 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
3038 | } else { | |
c0191e76 | 3039 | /* Read zeros after EOF */ |
4049082c | 3040 | int64_t total_sectors, max_nb_sectors; |
893a8f62 | 3041 | |
4049082c MA |
3042 | total_sectors = bdrv_nb_sectors(bs); |
3043 | if (total_sectors < 0) { | |
3044 | ret = total_sectors; | |
893a8f62 MK |
3045 | goto out; |
3046 | } | |
3047 | ||
5f5bcd80 KW |
3048 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
3049 | align >> BDRV_SECTOR_BITS); | |
e012b78c PB |
3050 | if (nb_sectors < max_nb_sectors) { |
3051 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
3052 | } else if (max_nb_sectors > 0) { | |
33f461e0 | 3053 | QEMUIOVector local_qiov; |
33f461e0 KW |
3054 | |
3055 | qemu_iovec_init(&local_qiov, qiov->niov); | |
3056 | qemu_iovec_concat(&local_qiov, qiov, 0, | |
e012b78c | 3057 | max_nb_sectors * BDRV_SECTOR_SIZE); |
33f461e0 | 3058 | |
e012b78c | 3059 | ret = drv->bdrv_co_readv(bs, sector_num, max_nb_sectors, |
33f461e0 KW |
3060 | &local_qiov); |
3061 | ||
3062 | qemu_iovec_destroy(&local_qiov); | |
893a8f62 MK |
3063 | } else { |
3064 | ret = 0; | |
3065 | } | |
3066 | ||
3067 | /* Reading beyond end of file is supposed to produce zeroes */ | |
3068 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
3069 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
3070 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
3071 | BDRV_SECTOR_SIZE; | |
3072 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
3073 | } | |
3074 | } | |
ab185921 SH |
3075 | |
3076 | out: | |
dbffbdcf | 3077 | return ret; |
da1fa91d KW |
3078 | } |
3079 | ||
d0c7f642 KW |
3080 | /* |
3081 | * Handle a read request in coroutine context | |
3082 | */ | |
1b0288ae KW |
3083 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
3084 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
3085 | BdrvRequestFlags flags) |
3086 | { | |
3087 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
3088 | BdrvTrackedRequest req; |
3089 | ||
1b0288ae KW |
3090 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3091 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3092 | uint8_t *head_buf = NULL; | |
3093 | uint8_t *tail_buf = NULL; | |
3094 | QEMUIOVector local_qiov; | |
3095 | bool use_local_qiov = false; | |
d0c7f642 KW |
3096 | int ret; |
3097 | ||
3098 | if (!drv) { | |
3099 | return -ENOMEDIUM; | |
3100 | } | |
b9c64947 HR |
3101 | |
3102 | ret = bdrv_check_byte_request(bs, offset, bytes); | |
3103 | if (ret < 0) { | |
3104 | return ret; | |
d0c7f642 KW |
3105 | } |
3106 | ||
3107 | if (bs->copy_on_read) { | |
3108 | flags |= BDRV_REQ_COPY_ON_READ; | |
3109 | } | |
3110 | ||
3111 | /* throttling disk I/O */ | |
3112 | if (bs->io_limits_enabled) { | |
d5103588 | 3113 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3114 | } |
3115 | ||
3116 | /* Align read if necessary by padding qiov */ | |
3117 | if (offset & (align - 1)) { | |
3118 | head_buf = qemu_blockalign(bs, align); | |
3119 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3120 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3121 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3122 | use_local_qiov = true; | |
3123 | ||
3124 | bytes += offset & (align - 1); | |
3125 | offset = offset & ~(align - 1); | |
3126 | } | |
3127 | ||
3128 | if ((offset + bytes) & (align - 1)) { | |
3129 | if (!use_local_qiov) { | |
3130 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3131 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3132 | use_local_qiov = true; | |
3133 | } | |
3134 | tail_buf = qemu_blockalign(bs, align); | |
3135 | qemu_iovec_add(&local_qiov, tail_buf, | |
3136 | align - ((offset + bytes) & (align - 1))); | |
3137 | ||
3138 | bytes = ROUND_UP(bytes, align); | |
3139 | } | |
3140 | ||
65afd211 | 3141 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3142 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3143 | use_local_qiov ? &local_qiov : qiov, |
3144 | flags); | |
65afd211 | 3145 | tracked_request_end(&req); |
1b0288ae KW |
3146 | |
3147 | if (use_local_qiov) { | |
3148 | qemu_iovec_destroy(&local_qiov); | |
3149 | qemu_vfree(head_buf); | |
3150 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3151 | } |
3152 | ||
d0c7f642 KW |
3153 | return ret; |
3154 | } | |
3155 | ||
1b0288ae KW |
3156 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3157 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3158 | BdrvRequestFlags flags) | |
3159 | { | |
75af1f34 | 3160 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
1b0288ae KW |
3161 | return -EINVAL; |
3162 | } | |
3163 | ||
3164 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3165 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3166 | } | |
3167 | ||
c5fbe571 | 3168 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3169 | int nb_sectors, QEMUIOVector *qiov) |
3170 | { | |
c5fbe571 | 3171 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3172 | |
470c0504 SH |
3173 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3174 | } | |
3175 | ||
3176 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3177 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3178 | { | |
3179 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3180 | ||
3181 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3182 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3183 | } |
3184 | ||
98764152 | 3185 | #define MAX_WRITE_ZEROES_BOUNCE_BUFFER 32768 |
c31cb707 | 3186 | |
f08f2dda | 3187 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3188 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3189 | { |
3190 | BlockDriver *drv = bs->drv; | |
3191 | QEMUIOVector qiov; | |
c31cb707 PL |
3192 | struct iovec iov = {0}; |
3193 | int ret = 0; | |
f08f2dda | 3194 | |
75af1f34 PL |
3195 | int max_write_zeroes = MIN_NON_ZERO(bs->bl.max_write_zeroes, |
3196 | BDRV_REQUEST_MAX_SECTORS); | |
621f0589 | 3197 | |
c31cb707 PL |
3198 | while (nb_sectors > 0 && !ret) { |
3199 | int num = nb_sectors; | |
3200 | ||
b8d71c09 PB |
3201 | /* Align request. Block drivers can expect the "bulk" of the request |
3202 | * to be aligned. | |
3203 | */ | |
3204 | if (bs->bl.write_zeroes_alignment | |
3205 | && num > bs->bl.write_zeroes_alignment) { | |
3206 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3207 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3208 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3209 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3210 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3211 | /* Shorten the request to the last aligned sector. num cannot | |
3212 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3213 | */ | |
3214 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3215 | } |
621f0589 | 3216 | } |
f08f2dda | 3217 | |
c31cb707 PL |
3218 | /* limit request size */ |
3219 | if (num > max_write_zeroes) { | |
3220 | num = max_write_zeroes; | |
3221 | } | |
3222 | ||
3223 | ret = -ENOTSUP; | |
3224 | /* First try the efficient write zeroes operation */ | |
3225 | if (drv->bdrv_co_write_zeroes) { | |
3226 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3227 | } | |
3228 | ||
3229 | if (ret == -ENOTSUP) { | |
3230 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
095e4fa4 | 3231 | int max_xfer_len = MIN_NON_ZERO(bs->bl.max_transfer_length, |
98764152 | 3232 | MAX_WRITE_ZEROES_BOUNCE_BUFFER); |
095e4fa4 | 3233 | num = MIN(num, max_xfer_len); |
c31cb707 PL |
3234 | iov.iov_len = num * BDRV_SECTOR_SIZE; |
3235 | if (iov.iov_base == NULL) { | |
857d4f46 KW |
3236 | iov.iov_base = qemu_try_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3237 | if (iov.iov_base == NULL) { | |
3238 | ret = -ENOMEM; | |
3239 | goto fail; | |
3240 | } | |
b8d71c09 | 3241 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); |
c31cb707 PL |
3242 | } |
3243 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3244 | |
c31cb707 | 3245 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3246 | |
3247 | /* Keep bounce buffer around if it is big enough for all | |
3248 | * all future requests. | |
3249 | */ | |
095e4fa4 | 3250 | if (num < max_xfer_len) { |
b8d71c09 PB |
3251 | qemu_vfree(iov.iov_base); |
3252 | iov.iov_base = NULL; | |
3253 | } | |
c31cb707 PL |
3254 | } |
3255 | ||
3256 | sector_num += num; | |
3257 | nb_sectors -= num; | |
3258 | } | |
f08f2dda | 3259 | |
857d4f46 | 3260 | fail: |
f08f2dda SH |
3261 | qemu_vfree(iov.iov_base); |
3262 | return ret; | |
3263 | } | |
3264 | ||
c5fbe571 | 3265 | /* |
b404f720 | 3266 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3267 | */ |
b404f720 | 3268 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3269 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3270 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3271 | { |
3272 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3273 | bool waited; |
6b7cb247 | 3274 | int ret; |
da1fa91d | 3275 | |
b404f720 KW |
3276 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3277 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3278 | |
b404f720 KW |
3279 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3280 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3281 | assert(!qiov || bytes == qiov->size); |
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 | 3315 | |
5366d0c8 | 3316 | block_acct_highest_sector(&bs->stats, sector_num, nb_sectors); |
5e5a94b6 | 3317 | |
c0191e76 | 3318 | if (ret >= 0) { |
df2a6f29 PB |
3319 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); |
3320 | } | |
da1fa91d | 3321 | |
6b7cb247 | 3322 | return ret; |
da1fa91d KW |
3323 | } |
3324 | ||
b404f720 KW |
3325 | /* |
3326 | * Handle a write request in coroutine context | |
3327 | */ | |
6601553e KW |
3328 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3329 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3330 | BdrvRequestFlags flags) |
3331 | { | |
65afd211 | 3332 | BdrvTrackedRequest req; |
3b8242e0 KW |
3333 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3334 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3335 | uint8_t *head_buf = NULL; | |
3336 | uint8_t *tail_buf = NULL; | |
3337 | QEMUIOVector local_qiov; | |
3338 | bool use_local_qiov = false; | |
b404f720 KW |
3339 | int ret; |
3340 | ||
3341 | if (!bs->drv) { | |
3342 | return -ENOMEDIUM; | |
3343 | } | |
3344 | if (bs->read_only) { | |
3345 | return -EACCES; | |
3346 | } | |
b9c64947 HR |
3347 | |
3348 | ret = bdrv_check_byte_request(bs, offset, bytes); | |
3349 | if (ret < 0) { | |
3350 | return ret; | |
b404f720 KW |
3351 | } |
3352 | ||
b404f720 KW |
3353 | /* throttling disk I/O */ |
3354 | if (bs->io_limits_enabled) { | |
d5103588 | 3355 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3356 | } |
3357 | ||
3b8242e0 KW |
3358 | /* |
3359 | * Align write if necessary by performing a read-modify-write cycle. | |
3360 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3361 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3362 | */ | |
65afd211 | 3363 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3364 | |
3365 | if (offset & (align - 1)) { | |
3366 | QEMUIOVector head_qiov; | |
3367 | struct iovec head_iov; | |
3368 | ||
3369 | mark_request_serialising(&req, align); | |
3370 | wait_serialising_requests(&req); | |
3371 | ||
3372 | head_buf = qemu_blockalign(bs, align); | |
3373 | head_iov = (struct iovec) { | |
3374 | .iov_base = head_buf, | |
3375 | .iov_len = align, | |
3376 | }; | |
3377 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3378 | ||
9e1cb96d | 3379 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3380 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3381 | align, &head_qiov, 0); | |
3382 | if (ret < 0) { | |
3383 | goto fail; | |
3384 | } | |
9e1cb96d | 3385 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3386 | |
3387 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3388 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3389 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3390 | use_local_qiov = true; | |
3391 | ||
3392 | bytes += offset & (align - 1); | |
3393 | offset = offset & ~(align - 1); | |
3394 | } | |
3395 | ||
3396 | if ((offset + bytes) & (align - 1)) { | |
3397 | QEMUIOVector tail_qiov; | |
3398 | struct iovec tail_iov; | |
3399 | size_t tail_bytes; | |
28de2dcd | 3400 | bool waited; |
3b8242e0 KW |
3401 | |
3402 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3403 | waited = wait_serialising_requests(&req); |
3404 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3405 | |
3406 | tail_buf = qemu_blockalign(bs, align); | |
3407 | tail_iov = (struct iovec) { | |
3408 | .iov_base = tail_buf, | |
3409 | .iov_len = align, | |
3410 | }; | |
3411 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3412 | ||
9e1cb96d | 3413 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3414 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3415 | align, &tail_qiov, 0); | |
3416 | if (ret < 0) { | |
3417 | goto fail; | |
3418 | } | |
9e1cb96d | 3419 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3420 | |
3421 | if (!use_local_qiov) { | |
3422 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3423 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3424 | use_local_qiov = true; | |
3425 | } | |
3426 | ||
3427 | tail_bytes = (offset + bytes) & (align - 1); | |
3428 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3429 | ||
3430 | bytes = ROUND_UP(bytes, align); | |
3431 | } | |
3432 | ||
3433 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, | |
3434 | use_local_qiov ? &local_qiov : qiov, | |
3435 | flags); | |
3436 | ||
3437 | fail: | |
65afd211 | 3438 | tracked_request_end(&req); |
b404f720 | 3439 | |
3b8242e0 KW |
3440 | if (use_local_qiov) { |
3441 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3442 | } |
99c4a85c KW |
3443 | qemu_vfree(head_buf); |
3444 | qemu_vfree(tail_buf); | |
3b8242e0 | 3445 | |
b404f720 KW |
3446 | return ret; |
3447 | } | |
3448 | ||
6601553e KW |
3449 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3450 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3451 | BdrvRequestFlags flags) | |
3452 | { | |
75af1f34 | 3453 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
6601553e KW |
3454 | return -EINVAL; |
3455 | } | |
3456 | ||
3457 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3458 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3459 | } | |
3460 | ||
c5fbe571 SH |
3461 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3462 | int nb_sectors, QEMUIOVector *qiov) | |
3463 | { | |
3464 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3465 | ||
f08f2dda SH |
3466 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3467 | } | |
3468 | ||
3469 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3470 | int64_t sector_num, int nb_sectors, |
3471 | BdrvRequestFlags flags) | |
f08f2dda | 3472 | { |
94d6ff21 | 3473 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3474 | |
d32f35cb PL |
3475 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3476 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3477 | } | |
3478 | ||
f08f2dda | 3479 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3480 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3481 | } |
3482 | ||
83f64091 FB |
3483 | /** |
3484 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3485 | */ | |
3486 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3487 | { | |
3488 | BlockDriver *drv = bs->drv; | |
51762288 | 3489 | int ret; |
83f64091 | 3490 | if (!drv) |
19cb3738 | 3491 | return -ENOMEDIUM; |
83f64091 FB |
3492 | if (!drv->bdrv_truncate) |
3493 | return -ENOTSUP; | |
59f2689d NS |
3494 | if (bs->read_only) |
3495 | return -EACCES; | |
9c75e168 | 3496 | |
51762288 SH |
3497 | ret = drv->bdrv_truncate(bs, offset); |
3498 | if (ret == 0) { | |
3499 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
a7f53e26 MA |
3500 | if (bs->blk) { |
3501 | blk_dev_resize_cb(bs->blk); | |
3502 | } | |
51762288 SH |
3503 | } |
3504 | return ret; | |
83f64091 FB |
3505 | } |
3506 | ||
4a1d5e1f FZ |
3507 | /** |
3508 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3509 | * allocated space. Return < 0 if error or unknown. | |
3510 | */ | |
3511 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3512 | { | |
3513 | BlockDriver *drv = bs->drv; | |
3514 | if (!drv) { | |
3515 | return -ENOMEDIUM; | |
3516 | } | |
3517 | if (drv->bdrv_get_allocated_file_size) { | |
3518 | return drv->bdrv_get_allocated_file_size(bs); | |
3519 | } | |
3520 | if (bs->file) { | |
3521 | return bdrv_get_allocated_file_size(bs->file); | |
3522 | } | |
3523 | return -ENOTSUP; | |
3524 | } | |
3525 | ||
83f64091 | 3526 | /** |
65a9bb25 | 3527 | * Return number of sectors on success, -errno on error. |
83f64091 | 3528 | */ |
65a9bb25 | 3529 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
83f64091 FB |
3530 | { |
3531 | BlockDriver *drv = bs->drv; | |
65a9bb25 | 3532 | |
83f64091 | 3533 | if (!drv) |
19cb3738 | 3534 | return -ENOMEDIUM; |
51762288 | 3535 | |
b94a2610 KW |
3536 | if (drv->has_variable_length) { |
3537 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3538 | if (ret < 0) { | |
3539 | return ret; | |
46a4e4e6 | 3540 | } |
83f64091 | 3541 | } |
65a9bb25 MA |
3542 | return bs->total_sectors; |
3543 | } | |
3544 | ||
3545 | /** | |
3546 | * Return length in bytes on success, -errno on error. | |
3547 | * The length is always a multiple of BDRV_SECTOR_SIZE. | |
3548 | */ | |
3549 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3550 | { | |
3551 | int64_t ret = bdrv_nb_sectors(bs); | |
3552 | ||
3553 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; | |
fc01f7e7 FB |
3554 | } |
3555 | ||
19cb3738 | 3556 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3557 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3558 | { |
65a9bb25 MA |
3559 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
3560 | ||
3561 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; | |
fc01f7e7 | 3562 | } |
cf98951b | 3563 | |
ff06f5f3 PB |
3564 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3565 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3566 | { |
3567 | bs->on_read_error = on_read_error; | |
3568 | bs->on_write_error = on_write_error; | |
3569 | } | |
3570 | ||
1ceee0d5 | 3571 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3572 | { |
3573 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3574 | } | |
3575 | ||
3e1caa5f PB |
3576 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3577 | { | |
3578 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3579 | ||
3580 | switch (on_err) { | |
3581 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
3582 | return (error == ENOSPC) ? |
3583 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
3e1caa5f | 3584 | case BLOCKDEV_ON_ERROR_STOP: |
a589569f | 3585 | return BLOCK_ERROR_ACTION_STOP; |
3e1caa5f | 3586 | case BLOCKDEV_ON_ERROR_REPORT: |
a589569f | 3587 | return BLOCK_ERROR_ACTION_REPORT; |
3e1caa5f | 3588 | case BLOCKDEV_ON_ERROR_IGNORE: |
a589569f | 3589 | return BLOCK_ERROR_ACTION_IGNORE; |
3e1caa5f PB |
3590 | default: |
3591 | abort(); | |
3592 | } | |
3593 | } | |
3594 | ||
c7c2ff0c LC |
3595 | static void send_qmp_error_event(BlockDriverState *bs, |
3596 | BlockErrorAction action, | |
3597 | bool is_read, int error) | |
3598 | { | |
573742a5 | 3599 | IoOperationType optype; |
c7c2ff0c | 3600 | |
573742a5 PM |
3601 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; |
3602 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), optype, action, | |
c7c2ff0c | 3603 | bdrv_iostatus_is_enabled(bs), |
624ff573 LC |
3604 | error == ENOSPC, strerror(error), |
3605 | &error_abort); | |
c7c2ff0c LC |
3606 | } |
3607 | ||
3e1caa5f PB |
3608 | /* This is done by device models because, while the block layer knows |
3609 | * about the error, it does not know whether an operation comes from | |
3610 | * the device or the block layer (from a job, for example). | |
3611 | */ | |
3612 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3613 | bool is_read, int error) | |
3614 | { | |
3615 | assert(error >= 0); | |
2bd3bce8 | 3616 | |
a589569f | 3617 | if (action == BLOCK_ERROR_ACTION_STOP) { |
2bd3bce8 PB |
3618 | /* First set the iostatus, so that "info block" returns an iostatus |
3619 | * that matches the events raised so far (an additional error iostatus | |
3620 | * is fine, but not a lost one). | |
3621 | */ | |
3e1caa5f | 3622 | bdrv_iostatus_set_err(bs, error); |
2bd3bce8 PB |
3623 | |
3624 | /* Then raise the request to stop the VM and the event. | |
3625 | * qemu_system_vmstop_request_prepare has two effects. First, | |
3626 | * it ensures that the STOP event always comes after the | |
3627 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
3628 | * can observe the STOP event and do a "cont" before the STOP | |
3629 | * event is issued, the VM will not stop. In this case, vm_start() | |
3630 | * also ensures that the STOP/RESUME pair of events is emitted. | |
3631 | */ | |
3632 | qemu_system_vmstop_request_prepare(); | |
c7c2ff0c | 3633 | send_qmp_error_event(bs, action, is_read, error); |
2bd3bce8 PB |
3634 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
3635 | } else { | |
c7c2ff0c | 3636 | send_qmp_error_event(bs, action, is_read, error); |
3e1caa5f PB |
3637 | } |
3638 | } | |
3639 | ||
b338082b FB |
3640 | int bdrv_is_read_only(BlockDriverState *bs) |
3641 | { | |
3642 | return bs->read_only; | |
3643 | } | |
3644 | ||
985a03b0 TS |
3645 | int bdrv_is_sg(BlockDriverState *bs) |
3646 | { | |
3647 | return bs->sg; | |
3648 | } | |
3649 | ||
e900a7b7 CH |
3650 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3651 | { | |
3652 | return bs->enable_write_cache; | |
3653 | } | |
3654 | ||
425b0148 PB |
3655 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3656 | { | |
3657 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3658 | |
3659 | /* so a reopen() will preserve wce */ | |
3660 | if (wce) { | |
3661 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3662 | } else { | |
3663 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3664 | } | |
425b0148 PB |
3665 | } |
3666 | ||
ea2384d3 FB |
3667 | int bdrv_is_encrypted(BlockDriverState *bs) |
3668 | { | |
3669 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3670 | return 1; | |
3671 | return bs->encrypted; | |
3672 | } | |
3673 | ||
c0f4ce77 AL |
3674 | int bdrv_key_required(BlockDriverState *bs) |
3675 | { | |
3676 | BlockDriverState *backing_hd = bs->backing_hd; | |
3677 | ||
3678 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3679 | return 1; | |
3680 | return (bs->encrypted && !bs->valid_key); | |
3681 | } | |
3682 | ||
ea2384d3 FB |
3683 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3684 | { | |
3685 | int ret; | |
3686 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3687 | ret = bdrv_set_key(bs->backing_hd, key); | |
3688 | if (ret < 0) | |
3689 | return ret; | |
3690 | if (!bs->encrypted) | |
3691 | return 0; | |
3692 | } | |
fd04a2ae SH |
3693 | if (!bs->encrypted) { |
3694 | return -EINVAL; | |
3695 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3696 | return -ENOMEDIUM; | |
3697 | } | |
c0f4ce77 | 3698 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3699 | if (ret < 0) { |
3700 | bs->valid_key = 0; | |
3701 | } else if (!bs->valid_key) { | |
3702 | bs->valid_key = 1; | |
a7f53e26 MA |
3703 | if (bs->blk) { |
3704 | /* call the change callback now, we skipped it on open */ | |
3705 | blk_dev_change_media_cb(bs->blk, true); | |
3706 | } | |
bb5fc20f | 3707 | } |
c0f4ce77 | 3708 | return ret; |
ea2384d3 FB |
3709 | } |
3710 | ||
4d2855a3 MA |
3711 | /* |
3712 | * Provide an encryption key for @bs. | |
3713 | * If @key is non-null: | |
3714 | * If @bs is not encrypted, fail. | |
3715 | * Else if the key is invalid, fail. | |
3716 | * Else set @bs's key to @key, replacing the existing key, if any. | |
3717 | * If @key is null: | |
3718 | * If @bs is encrypted and still lacks a key, fail. | |
3719 | * Else do nothing. | |
3720 | * On failure, store an error object through @errp if non-null. | |
3721 | */ | |
3722 | void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp) | |
3723 | { | |
3724 | if (key) { | |
3725 | if (!bdrv_is_encrypted(bs)) { | |
b1ca6391 | 3726 | error_setg(errp, "Device '%s' is not encrypted", |
4d2855a3 MA |
3727 | bdrv_get_device_name(bs)); |
3728 | } else if (bdrv_set_key(bs, key) < 0) { | |
3729 | error_set(errp, QERR_INVALID_PASSWORD); | |
3730 | } | |
3731 | } else { | |
3732 | if (bdrv_key_required(bs)) { | |
b1ca6391 MA |
3733 | error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED, |
3734 | "'%s' (%s) is encrypted", | |
4d2855a3 MA |
3735 | bdrv_get_device_name(bs), |
3736 | bdrv_get_encrypted_filename(bs)); | |
3737 | } | |
3738 | } | |
3739 | } | |
3740 | ||
f8d6bba1 | 3741 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3742 | { |
f8d6bba1 | 3743 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3744 | } |
3745 | ||
ada42401 SH |
3746 | static int qsort_strcmp(const void *a, const void *b) |
3747 | { | |
3748 | return strcmp(a, b); | |
3749 | } | |
3750 | ||
5fafdf24 | 3751 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3752 | void *opaque) |
3753 | { | |
3754 | BlockDriver *drv; | |
e855e4fb | 3755 | int count = 0; |
ada42401 | 3756 | int i; |
e855e4fb | 3757 | const char **formats = NULL; |
ea2384d3 | 3758 | |
8a22f02a | 3759 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
e855e4fb JC |
3760 | if (drv->format_name) { |
3761 | bool found = false; | |
3762 | int i = count; | |
3763 | while (formats && i && !found) { | |
3764 | found = !strcmp(formats[--i], drv->format_name); | |
3765 | } | |
3766 | ||
3767 | if (!found) { | |
5839e53b | 3768 | formats = g_renew(const char *, formats, count + 1); |
e855e4fb | 3769 | formats[count++] = drv->format_name; |
e855e4fb JC |
3770 | } |
3771 | } | |
ea2384d3 | 3772 | } |
ada42401 SH |
3773 | |
3774 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); | |
3775 | ||
3776 | for (i = 0; i < count; i++) { | |
3777 | it(opaque, formats[i]); | |
3778 | } | |
3779 | ||
e855e4fb | 3780 | g_free(formats); |
ea2384d3 FB |
3781 | } |
3782 | ||
dc364f4c | 3783 | /* This function is to find block backend bs */ |
7f06d47e | 3784 | /* TODO convert callers to blk_by_name(), then remove */ |
b338082b FB |
3785 | BlockDriverState *bdrv_find(const char *name) |
3786 | { | |
7f06d47e | 3787 | BlockBackend *blk = blk_by_name(name); |
b338082b | 3788 | |
7f06d47e | 3789 | return blk ? blk_bs(blk) : NULL; |
b338082b FB |
3790 | } |
3791 | ||
dc364f4c BC |
3792 | /* This function is to find a node in the bs graph */ |
3793 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3794 | { | |
3795 | BlockDriverState *bs; | |
3796 | ||
3797 | assert(node_name); | |
3798 | ||
3799 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3800 | if (!strcmp(node_name, bs->node_name)) { | |
3801 | return bs; | |
3802 | } | |
3803 | } | |
3804 | return NULL; | |
3805 | } | |
3806 | ||
c13163fb BC |
3807 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3808 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3809 | { | |
3810 | BlockDeviceInfoList *list, *entry; | |
3811 | BlockDriverState *bs; | |
3812 | ||
3813 | list = NULL; | |
3814 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3815 | entry = g_malloc0(sizeof(*entry)); | |
3816 | entry->value = bdrv_block_device_info(bs); | |
3817 | entry->next = list; | |
3818 | list = entry; | |
3819 | } | |
3820 | ||
3821 | return list; | |
3822 | } | |
3823 | ||
12d3ba82 BC |
3824 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3825 | const char *node_name, | |
3826 | Error **errp) | |
3827 | { | |
7f06d47e MA |
3828 | BlockBackend *blk; |
3829 | BlockDriverState *bs; | |
12d3ba82 | 3830 | |
12d3ba82 | 3831 | if (device) { |
7f06d47e | 3832 | blk = blk_by_name(device); |
12d3ba82 | 3833 | |
7f06d47e MA |
3834 | if (blk) { |
3835 | return blk_bs(blk); | |
12d3ba82 | 3836 | } |
12d3ba82 BC |
3837 | } |
3838 | ||
dd67fa50 BC |
3839 | if (node_name) { |
3840 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3841 | |
dd67fa50 BC |
3842 | if (bs) { |
3843 | return bs; | |
3844 | } | |
12d3ba82 BC |
3845 | } |
3846 | ||
dd67fa50 BC |
3847 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3848 | device ? device : "", | |
3849 | node_name ? node_name : ""); | |
3850 | return NULL; | |
12d3ba82 BC |
3851 | } |
3852 | ||
5a6684d2 JC |
3853 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
3854 | * return false. If either argument is NULL, return false. */ | |
3855 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
3856 | { | |
3857 | while (top && top != base) { | |
3858 | top = top->backing_hd; | |
3859 | } | |
3860 | ||
3861 | return top != NULL; | |
3862 | } | |
3863 | ||
04df765a FZ |
3864 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
3865 | { | |
3866 | if (!bs) { | |
3867 | return QTAILQ_FIRST(&graph_bdrv_states); | |
3868 | } | |
3869 | return QTAILQ_NEXT(bs, node_list); | |
3870 | } | |
3871 | ||
2f399b0a MA |
3872 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3873 | { | |
3874 | if (!bs) { | |
3875 | return QTAILQ_FIRST(&bdrv_states); | |
3876 | } | |
dc364f4c | 3877 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3878 | } |
3879 | ||
20a9e77d FZ |
3880 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
3881 | { | |
3882 | return bs->node_name; | |
3883 | } | |
3884 | ||
7f06d47e | 3885 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
bfb197e0 | 3886 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
ea2384d3 | 3887 | { |
bfb197e0 | 3888 | return bs->blk ? blk_name(bs->blk) : ""; |
ea2384d3 FB |
3889 | } |
3890 | ||
c8433287 MA |
3891 | int bdrv_get_flags(BlockDriverState *bs) |
3892 | { | |
3893 | return bs->open_flags; | |
3894 | } | |
3895 | ||
f0f0fdfe | 3896 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3897 | { |
3898 | BlockDriverState *bs; | |
f0f0fdfe | 3899 | int result = 0; |
c6ca28d6 | 3900 | |
dc364f4c | 3901 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
3902 | AioContext *aio_context = bdrv_get_aio_context(bs); |
3903 | int ret; | |
3904 | ||
3905 | aio_context_acquire(aio_context); | |
3906 | ret = bdrv_flush(bs); | |
f0f0fdfe KW |
3907 | if (ret < 0 && !result) { |
3908 | result = ret; | |
3909 | } | |
ed78cda3 | 3910 | aio_context_release(aio_context); |
1b7bdbc1 | 3911 | } |
f0f0fdfe KW |
3912 | |
3913 | return result; | |
c6ca28d6 AL |
3914 | } |
3915 | ||
3ac21627 PL |
3916 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3917 | { | |
3918 | return 1; | |
3919 | } | |
3920 | ||
f2feebbd KW |
3921 | int bdrv_has_zero_init(BlockDriverState *bs) |
3922 | { | |
3923 | assert(bs->drv); | |
3924 | ||
11212d8f PB |
3925 | /* If BS is a copy on write image, it is initialized to |
3926 | the contents of the base image, which may not be zeroes. */ | |
3927 | if (bs->backing_hd) { | |
3928 | return 0; | |
3929 | } | |
336c1c12 KW |
3930 | if (bs->drv->bdrv_has_zero_init) { |
3931 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3932 | } |
3933 | ||
3ac21627 PL |
3934 | /* safe default */ |
3935 | return 0; | |
f2feebbd KW |
3936 | } |
3937 | ||
4ce78691 PL |
3938 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3939 | { | |
3940 | BlockDriverInfo bdi; | |
3941 | ||
3942 | if (bs->backing_hd) { | |
3943 | return false; | |
3944 | } | |
3945 | ||
3946 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3947 | return bdi.unallocated_blocks_are_zero; | |
3948 | } | |
3949 | ||
3950 | return false; | |
3951 | } | |
3952 | ||
3953 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3954 | { | |
3955 | BlockDriverInfo bdi; | |
3956 | ||
3957 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3958 | return false; | |
3959 | } | |
3960 | ||
3961 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3962 | return bdi.can_write_zeroes_with_unmap; | |
3963 | } | |
3964 | ||
3965 | return false; | |
3966 | } | |
3967 | ||
b6b8a333 | 3968 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3969 | BlockDriverState *bs; |
b35b2bba | 3970 | BlockDriverState *base; |
376ae3f1 SH |
3971 | int64_t sector_num; |
3972 | int nb_sectors; | |
3973 | int *pnum; | |
b6b8a333 | 3974 | int64_t ret; |
376ae3f1 | 3975 | bool done; |
b6b8a333 | 3976 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3977 | |
f58c7b35 | 3978 | /* |
705be728 FZ |
3979 | * Returns the allocation status of the specified sectors. |
3980 | * Drivers not implementing the functionality are assumed to not support | |
3981 | * backing files, hence all their sectors are reported as allocated. | |
f58c7b35 | 3982 | * |
bd9533e3 SH |
3983 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3984 | * and 'pnum' is set to 0. | |
3985 | * | |
f58c7b35 TS |
3986 | * 'pnum' is set to the number of sectors (including and immediately following |
3987 | * the specified sector) that are known to be in the same | |
3988 | * allocated/unallocated state. | |
3989 | * | |
bd9533e3 SH |
3990 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3991 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3992 | */ |
b6b8a333 PB |
3993 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3994 | int64_t sector_num, | |
3995 | int nb_sectors, int *pnum) | |
f58c7b35 | 3996 | { |
30a7f2fc | 3997 | int64_t total_sectors; |
bd9533e3 | 3998 | int64_t n; |
5daa74a6 | 3999 | int64_t ret, ret2; |
bd9533e3 | 4000 | |
30a7f2fc MA |
4001 | total_sectors = bdrv_nb_sectors(bs); |
4002 | if (total_sectors < 0) { | |
4003 | return total_sectors; | |
617ccb46 PB |
4004 | } |
4005 | ||
30a7f2fc | 4006 | if (sector_num >= total_sectors) { |
bd9533e3 SH |
4007 | *pnum = 0; |
4008 | return 0; | |
4009 | } | |
4010 | ||
30a7f2fc | 4011 | n = total_sectors - sector_num; |
bd9533e3 SH |
4012 | if (n < nb_sectors) { |
4013 | nb_sectors = n; | |
4014 | } | |
4015 | ||
b6b8a333 | 4016 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 4017 | *pnum = nb_sectors; |
e88ae226 | 4018 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
918e92d7 PB |
4019 | if (bs->drv->protocol_name) { |
4020 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
4021 | } | |
4022 | return ret; | |
f58c7b35 | 4023 | } |
6aebab14 | 4024 | |
415b5b01 PB |
4025 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
4026 | if (ret < 0) { | |
3e0a233d | 4027 | *pnum = 0; |
415b5b01 PB |
4028 | return ret; |
4029 | } | |
4030 | ||
92bc50a5 PL |
4031 | if (ret & BDRV_BLOCK_RAW) { |
4032 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
4033 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
4034 | *pnum, pnum); | |
4035 | } | |
4036 | ||
e88ae226 KW |
4037 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
4038 | ret |= BDRV_BLOCK_ALLOCATED; | |
4039 | } | |
4040 | ||
c3d86884 PL |
4041 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
4042 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 4043 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 4044 | } else if (bs->backing_hd) { |
f0ad5712 | 4045 | BlockDriverState *bs2 = bs->backing_hd; |
30a7f2fc MA |
4046 | int64_t nb_sectors2 = bdrv_nb_sectors(bs2); |
4047 | if (nb_sectors2 >= 0 && sector_num >= nb_sectors2) { | |
f0ad5712 PB |
4048 | ret |= BDRV_BLOCK_ZERO; |
4049 | } | |
4050 | } | |
415b5b01 | 4051 | } |
5daa74a6 PB |
4052 | |
4053 | if (bs->file && | |
4054 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
4055 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
59c9a95f HR |
4056 | int file_pnum; |
4057 | ||
5daa74a6 | 4058 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
59c9a95f | 4059 | *pnum, &file_pnum); |
5daa74a6 PB |
4060 | if (ret2 >= 0) { |
4061 | /* Ignore errors. This is just providing extra information, it | |
4062 | * is useful but not necessary. | |
4063 | */ | |
59c9a95f HR |
4064 | if (!file_pnum) { |
4065 | /* !file_pnum indicates an offset at or beyond the EOF; it is | |
4066 | * perfectly valid for the format block driver to point to such | |
4067 | * offsets, so catch it and mark everything as zero */ | |
4068 | ret |= BDRV_BLOCK_ZERO; | |
4069 | } else { | |
4070 | /* Limit request to the range reported by the protocol driver */ | |
4071 | *pnum = file_pnum; | |
4072 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
4073 | } | |
5daa74a6 PB |
4074 | } |
4075 | } | |
4076 | ||
415b5b01 | 4077 | return ret; |
060f51c9 SH |
4078 | } |
4079 | ||
b6b8a333 PB |
4080 | /* Coroutine wrapper for bdrv_get_block_status() */ |
4081 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 4082 | { |
b6b8a333 | 4083 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
4084 | BlockDriverState *bs = data->bs; |
4085 | ||
b6b8a333 PB |
4086 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
4087 | data->pnum); | |
060f51c9 SH |
4088 | data->done = true; |
4089 | } | |
4090 | ||
4091 | /* | |
b6b8a333 | 4092 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 4093 | * |
b6b8a333 | 4094 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 4095 | */ |
b6b8a333 PB |
4096 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
4097 | int nb_sectors, int *pnum) | |
060f51c9 | 4098 | { |
6aebab14 | 4099 | Coroutine *co; |
b6b8a333 | 4100 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
4101 | .bs = bs, |
4102 | .sector_num = sector_num, | |
4103 | .nb_sectors = nb_sectors, | |
4104 | .pnum = pnum, | |
4105 | .done = false, | |
4106 | }; | |
4107 | ||
bdad13b9 PB |
4108 | if (qemu_in_coroutine()) { |
4109 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 4110 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 4111 | } else { |
2572b37a SH |
4112 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4113 | ||
b6b8a333 | 4114 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
4115 | qemu_coroutine_enter(co, &data); |
4116 | while (!data.done) { | |
2572b37a | 4117 | aio_poll(aio_context, true); |
bdad13b9 | 4118 | } |
6aebab14 SH |
4119 | } |
4120 | return data.ret; | |
f58c7b35 TS |
4121 | } |
4122 | ||
b6b8a333 PB |
4123 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
4124 | int nb_sectors, int *pnum) | |
4125 | { | |
4333bb71 PB |
4126 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
4127 | if (ret < 0) { | |
4128 | return ret; | |
4129 | } | |
01fb2705 | 4130 | return !!(ret & BDRV_BLOCK_ALLOCATED); |
b6b8a333 PB |
4131 | } |
4132 | ||
188a7bbf PB |
4133 | /* |
4134 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
4135 | * | |
4136 | * Return true if the given sector is allocated in any image between | |
4137 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
4138 | * sector is allocated in any image of the chain. Return false otherwise. | |
4139 | * | |
4140 | * 'pnum' is set to the number of sectors (including and immediately following | |
4141 | * the specified sector) that are known to be in the same | |
4142 | * allocated/unallocated state. | |
4143 | * | |
4144 | */ | |
4f578637 PB |
4145 | int bdrv_is_allocated_above(BlockDriverState *top, |
4146 | BlockDriverState *base, | |
4147 | int64_t sector_num, | |
4148 | int nb_sectors, int *pnum) | |
188a7bbf PB |
4149 | { |
4150 | BlockDriverState *intermediate; | |
4151 | int ret, n = nb_sectors; | |
4152 | ||
4153 | intermediate = top; | |
4154 | while (intermediate && intermediate != base) { | |
4155 | int pnum_inter; | |
bdad13b9 PB |
4156 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
4157 | &pnum_inter); | |
188a7bbf PB |
4158 | if (ret < 0) { |
4159 | return ret; | |
4160 | } else if (ret) { | |
4161 | *pnum = pnum_inter; | |
4162 | return 1; | |
4163 | } | |
4164 | ||
4165 | /* | |
4166 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
4167 | * might have | |
4168 | * | |
4169 | * [sector_num+x, nr_sectors] allocated. | |
4170 | */ | |
63ba17d3 VI |
4171 | if (n > pnum_inter && |
4172 | (intermediate == top || | |
4173 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
4174 | n = pnum_inter; |
4175 | } | |
4176 | ||
4177 | intermediate = intermediate->backing_hd; | |
4178 | } | |
4179 | ||
4180 | *pnum = n; | |
4181 | return 0; | |
4182 | } | |
4183 | ||
045df330 AL |
4184 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
4185 | { | |
4186 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
4187 | return bs->backing_file; | |
4188 | else if (bs->encrypted) | |
4189 | return bs->filename; | |
4190 | else | |
4191 | return NULL; | |
4192 | } | |
4193 | ||
5fafdf24 | 4194 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
4195 | char *filename, int filename_size) |
4196 | { | |
3574c608 | 4197 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
4198 | } |
4199 | ||
5fafdf24 | 4200 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
4201 | const uint8_t *buf, int nb_sectors) |
4202 | { | |
4203 | BlockDriver *drv = bs->drv; | |
b9c64947 HR |
4204 | int ret; |
4205 | ||
4206 | if (!drv) { | |
19cb3738 | 4207 | return -ENOMEDIUM; |
b9c64947 HR |
4208 | } |
4209 | if (!drv->bdrv_write_compressed) { | |
faea38e7 | 4210 | return -ENOTSUP; |
b9c64947 HR |
4211 | } |
4212 | ret = bdrv_check_request(bs, sector_num, nb_sectors); | |
4213 | if (ret < 0) { | |
4214 | return ret; | |
4215 | } | |
a55eb92c | 4216 | |
e4654d2d | 4217 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 4218 | |
faea38e7 FB |
4219 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
4220 | } | |
3b46e624 | 4221 | |
faea38e7 FB |
4222 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
4223 | { | |
4224 | BlockDriver *drv = bs->drv; | |
4225 | if (!drv) | |
19cb3738 | 4226 | return -ENOMEDIUM; |
faea38e7 FB |
4227 | if (!drv->bdrv_get_info) |
4228 | return -ENOTSUP; | |
4229 | memset(bdi, 0, sizeof(*bdi)); | |
4230 | return drv->bdrv_get_info(bs, bdi); | |
4231 | } | |
4232 | ||
eae041fe HR |
4233 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
4234 | { | |
4235 | BlockDriver *drv = bs->drv; | |
4236 | if (drv && drv->bdrv_get_specific_info) { | |
4237 | return drv->bdrv_get_specific_info(bs); | |
4238 | } | |
4239 | return NULL; | |
4240 | } | |
4241 | ||
45566e9c CH |
4242 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
4243 | int64_t pos, int size) | |
cf8074b3 KW |
4244 | { |
4245 | QEMUIOVector qiov; | |
4246 | struct iovec iov = { | |
4247 | .iov_base = (void *) buf, | |
4248 | .iov_len = size, | |
4249 | }; | |
4250 | ||
4251 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4252 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
4253 | } | |
4254 | ||
4255 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4256 | { |
4257 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4258 | |
4259 | if (!drv) { | |
178e08a5 | 4260 | return -ENOMEDIUM; |
cf8074b3 KW |
4261 | } else if (drv->bdrv_save_vmstate) { |
4262 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4263 | } else if (bs->file) { | |
4264 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4265 | } | |
4266 | ||
7cdb1f6d | 4267 | return -ENOTSUP; |
178e08a5 AL |
4268 | } |
4269 | ||
45566e9c CH |
4270 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4271 | int64_t pos, int size) | |
178e08a5 AL |
4272 | { |
4273 | BlockDriver *drv = bs->drv; | |
4274 | if (!drv) | |
4275 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4276 | if (drv->bdrv_load_vmstate) |
4277 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4278 | if (bs->file) | |
4279 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4280 | return -ENOTSUP; | |
178e08a5 AL |
4281 | } |
4282 | ||
8b9b0cc2 KW |
4283 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4284 | { | |
bf736fe3 | 4285 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4286 | return; |
4287 | } | |
4288 | ||
bf736fe3 | 4289 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4290 | } |
4291 | ||
4292 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4293 | const char *tag) | |
4294 | { | |
4295 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4296 | bs = bs->file; | |
4297 | } | |
4298 | ||
4299 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4300 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4301 | } | |
4302 | ||
4303 | return -ENOTSUP; | |
4304 | } | |
4305 | ||
4cc70e93 FZ |
4306 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4307 | { | |
4308 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4309 | bs = bs->file; | |
4310 | } | |
4311 | ||
4312 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4313 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4314 | } | |
4315 | ||
4316 | return -ENOTSUP; | |
4317 | } | |
4318 | ||
41c695c7 KW |
4319 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4320 | { | |
938789ea | 4321 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
41c695c7 KW |
4322 | bs = bs->file; |
4323 | } | |
8b9b0cc2 | 4324 | |
41c695c7 KW |
4325 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4326 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4327 | } | |
4328 | ||
4329 | return -ENOTSUP; | |
4330 | } | |
4331 | ||
4332 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4333 | { | |
4334 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4335 | bs = bs->file; | |
4336 | } | |
4337 | ||
4338 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4339 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4340 | } | |
4341 | ||
4342 | return false; | |
8b9b0cc2 KW |
4343 | } |
4344 | ||
199630b6 BS |
4345 | int bdrv_is_snapshot(BlockDriverState *bs) |
4346 | { | |
4347 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4348 | } | |
4349 | ||
b1b1d783 JC |
4350 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4351 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4352 | * from a BDS as backing_file should not be done, as that may be relative to | |
4353 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4354 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4355 | const char *backing_file) | |
4356 | { | |
b1b1d783 JC |
4357 | char *filename_full = NULL; |
4358 | char *backing_file_full = NULL; | |
4359 | char *filename_tmp = NULL; | |
4360 | int is_protocol = 0; | |
4361 | BlockDriverState *curr_bs = NULL; | |
4362 | BlockDriverState *retval = NULL; | |
4363 | ||
4364 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4365 | return NULL; |
4366 | } | |
4367 | ||
b1b1d783 JC |
4368 | filename_full = g_malloc(PATH_MAX); |
4369 | backing_file_full = g_malloc(PATH_MAX); | |
4370 | filename_tmp = g_malloc(PATH_MAX); | |
4371 | ||
4372 | is_protocol = path_has_protocol(backing_file); | |
4373 | ||
4374 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4375 | ||
4376 | /* If either of the filename paths is actually a protocol, then | |
4377 | * compare unmodified paths; otherwise make paths relative */ | |
4378 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4379 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4380 | retval = curr_bs->backing_hd; | |
4381 | break; | |
4382 | } | |
e8a6bb9c | 4383 | } else { |
b1b1d783 JC |
4384 | /* If not an absolute filename path, make it relative to the current |
4385 | * image's filename path */ | |
4386 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4387 | backing_file); | |
4388 | ||
4389 | /* We are going to compare absolute pathnames */ | |
4390 | if (!realpath(filename_tmp, filename_full)) { | |
4391 | continue; | |
4392 | } | |
4393 | ||
4394 | /* We need to make sure the backing filename we are comparing against | |
4395 | * is relative to the current image filename (or absolute) */ | |
4396 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4397 | curr_bs->backing_file); | |
4398 | ||
4399 | if (!realpath(filename_tmp, backing_file_full)) { | |
4400 | continue; | |
4401 | } | |
4402 | ||
4403 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4404 | retval = curr_bs->backing_hd; | |
4405 | break; | |
4406 | } | |
e8a6bb9c MT |
4407 | } |
4408 | } | |
4409 | ||
b1b1d783 JC |
4410 | g_free(filename_full); |
4411 | g_free(backing_file_full); | |
4412 | g_free(filename_tmp); | |
4413 | return retval; | |
e8a6bb9c MT |
4414 | } |
4415 | ||
f198fd1c BC |
4416 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4417 | { | |
4418 | if (!bs->drv) { | |
4419 | return 0; | |
4420 | } | |
4421 | ||
4422 | if (!bs->backing_hd) { | |
4423 | return 0; | |
4424 | } | |
4425 | ||
4426 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4427 | } | |
4428 | ||
ea2384d3 | 4429 | /**************************************************************/ |
83f64091 | 4430 | /* async I/Os */ |
ea2384d3 | 4431 | |
7c84b1b8 MA |
4432 | BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
4433 | QEMUIOVector *qiov, int nb_sectors, | |
097310b5 | 4434 | BlockCompletionFunc *cb, void *opaque) |
83f64091 | 4435 | { |
bbf0a440 SH |
4436 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4437 | ||
d20d9b7c | 4438 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4439 | cb, opaque, false); |
ea2384d3 FB |
4440 | } |
4441 | ||
7c84b1b8 MA |
4442 | BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4443 | QEMUIOVector *qiov, int nb_sectors, | |
097310b5 | 4444 | BlockCompletionFunc *cb, void *opaque) |
ea2384d3 | 4445 | { |
bbf0a440 SH |
4446 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4447 | ||
d20d9b7c | 4448 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4449 | cb, opaque, true); |
83f64091 FB |
4450 | } |
4451 | ||
7c84b1b8 | 4452 | BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
d5ef94d4 | 4453 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, |
097310b5 | 4454 | BlockCompletionFunc *cb, void *opaque) |
d5ef94d4 PB |
4455 | { |
4456 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4457 | ||
4458 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4459 | BDRV_REQ_ZERO_WRITE | flags, | |
4460 | cb, opaque, true); | |
4461 | } | |
4462 | ||
40b4f539 KW |
4463 | |
4464 | typedef struct MultiwriteCB { | |
4465 | int error; | |
4466 | int num_requests; | |
4467 | int num_callbacks; | |
4468 | struct { | |
097310b5 | 4469 | BlockCompletionFunc *cb; |
40b4f539 KW |
4470 | void *opaque; |
4471 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4472 | } callbacks[]; |
4473 | } MultiwriteCB; | |
4474 | ||
4475 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4476 | { | |
4477 | int i; | |
4478 | ||
4479 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4480 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4481 | if (mcb->callbacks[i].free_qiov) { |
4482 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4483 | } | |
7267c094 | 4484 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4485 | } |
4486 | } | |
4487 | ||
4488 | static void multiwrite_cb(void *opaque, int ret) | |
4489 | { | |
4490 | MultiwriteCB *mcb = opaque; | |
4491 | ||
6d519a5f SH |
4492 | trace_multiwrite_cb(mcb, ret); |
4493 | ||
cb6d3ca0 | 4494 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4495 | mcb->error = ret; |
40b4f539 KW |
4496 | } |
4497 | ||
4498 | mcb->num_requests--; | |
4499 | if (mcb->num_requests == 0) { | |
de189a1b | 4500 | multiwrite_user_cb(mcb); |
7267c094 | 4501 | g_free(mcb); |
40b4f539 KW |
4502 | } |
4503 | } | |
4504 | ||
4505 | static int multiwrite_req_compare(const void *a, const void *b) | |
4506 | { | |
77be4366 CH |
4507 | const BlockRequest *req1 = a, *req2 = b; |
4508 | ||
4509 | /* | |
4510 | * Note that we can't simply subtract req2->sector from req1->sector | |
4511 | * here as that could overflow the return value. | |
4512 | */ | |
4513 | if (req1->sector > req2->sector) { | |
4514 | return 1; | |
4515 | } else if (req1->sector < req2->sector) { | |
4516 | return -1; | |
4517 | } else { | |
4518 | return 0; | |
4519 | } | |
40b4f539 KW |
4520 | } |
4521 | ||
4522 | /* | |
4523 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4524 | * requests that remain after merging. | |
4525 | */ | |
4526 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4527 | int num_reqs, MultiwriteCB *mcb) | |
4528 | { | |
4529 | int i, outidx; | |
4530 | ||
4531 | // Sort requests by start sector | |
4532 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4533 | ||
4534 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4535 | // filling up gaps with zero sectors. | |
4536 | outidx = 0; | |
4537 | for (i = 1; i < num_reqs; i++) { | |
4538 | int merge = 0; | |
4539 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4540 | ||
b6a127a1 | 4541 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4542 | if (reqs[i].sector <= oldreq_last) { |
4543 | merge = 1; | |
4544 | } | |
4545 | ||
e2a305fb CH |
4546 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4547 | merge = 0; | |
4548 | } | |
4549 | ||
6c5a42ac PL |
4550 | if (bs->bl.max_transfer_length && reqs[outidx].nb_sectors + |
4551 | reqs[i].nb_sectors > bs->bl.max_transfer_length) { | |
4552 | merge = 0; | |
4553 | } | |
4554 | ||
40b4f539 KW |
4555 | if (merge) { |
4556 | size_t size; | |
7267c094 | 4557 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4558 | qemu_iovec_init(qiov, |
4559 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4560 | ||
4561 | // Add the first request to the merged one. If the requests are | |
4562 | // overlapping, drop the last sectors of the first request. | |
4563 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4564 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4565 | |
b6a127a1 PB |
4566 | // We should need to add any zeros between the two requests |
4567 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4568 | |
4569 | // Add the second request | |
1b093c48 | 4570 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4571 | |
391827eb SH |
4572 | // Add tail of first request, if necessary |
4573 | if (qiov->size < reqs[outidx].qiov->size) { | |
4574 | qemu_iovec_concat(qiov, reqs[outidx].qiov, qiov->size, | |
4575 | reqs[outidx].qiov->size - qiov->size); | |
4576 | } | |
4577 | ||
cbf1dff2 | 4578 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4579 | reqs[outidx].qiov = qiov; |
4580 | ||
4581 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4582 | } else { | |
4583 | outidx++; | |
4584 | reqs[outidx].sector = reqs[i].sector; | |
4585 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4586 | reqs[outidx].qiov = reqs[i].qiov; | |
4587 | } | |
4588 | } | |
4589 | ||
f4564d53 PL |
4590 | block_acct_merge_done(&bs->stats, BLOCK_ACCT_WRITE, num_reqs - outidx - 1); |
4591 | ||
40b4f539 KW |
4592 | return outidx + 1; |
4593 | } | |
4594 | ||
4595 | /* | |
4596 | * Submit multiple AIO write requests at once. | |
4597 | * | |
4598 | * On success, the function returns 0 and all requests in the reqs array have | |
4599 | * been submitted. In error case this function returns -1, and any of the | |
4600 | * requests may or may not be submitted yet. In particular, this means that the | |
4601 | * callback will be called for some of the requests, for others it won't. The | |
4602 | * caller must check the error field of the BlockRequest to wait for the right | |
4603 | * callbacks (if error != 0, no callback will be called). | |
4604 | * | |
4605 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4606 | * requests. However, the fields opaque and error are left unmodified as they | |
4607 | * are used to signal failure for a single request to the caller. | |
4608 | */ | |
4609 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4610 | { | |
40b4f539 KW |
4611 | MultiwriteCB *mcb; |
4612 | int i; | |
4613 | ||
301db7c2 RH |
4614 | /* don't submit writes if we don't have a medium */ |
4615 | if (bs->drv == NULL) { | |
4616 | for (i = 0; i < num_reqs; i++) { | |
4617 | reqs[i].error = -ENOMEDIUM; | |
4618 | } | |
4619 | return -1; | |
4620 | } | |
4621 | ||
40b4f539 KW |
4622 | if (num_reqs == 0) { |
4623 | return 0; | |
4624 | } | |
4625 | ||
4626 | // Create MultiwriteCB structure | |
7267c094 | 4627 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4628 | mcb->num_requests = 0; |
4629 | mcb->num_callbacks = num_reqs; | |
4630 | ||
4631 | for (i = 0; i < num_reqs; i++) { | |
4632 | mcb->callbacks[i].cb = reqs[i].cb; | |
4633 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4634 | } | |
4635 | ||
4636 | // Check for mergable requests | |
4637 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4638 | ||
6d519a5f SH |
4639 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4640 | ||
df9309fb PB |
4641 | /* Run the aio requests. */ |
4642 | mcb->num_requests = num_reqs; | |
40b4f539 | 4643 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4644 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4645 | reqs[i].nb_sectors, reqs[i].flags, | |
4646 | multiwrite_cb, mcb, | |
4647 | true); | |
40b4f539 KW |
4648 | } |
4649 | ||
4650 | return 0; | |
40b4f539 KW |
4651 | } |
4652 | ||
7c84b1b8 | 4653 | void bdrv_aio_cancel(BlockAIOCB *acb) |
83f64091 | 4654 | { |
ca5fd113 FZ |
4655 | qemu_aio_ref(acb); |
4656 | bdrv_aio_cancel_async(acb); | |
4657 | while (acb->refcnt > 1) { | |
4658 | if (acb->aiocb_info->get_aio_context) { | |
4659 | aio_poll(acb->aiocb_info->get_aio_context(acb), true); | |
4660 | } else if (acb->bs) { | |
4661 | aio_poll(bdrv_get_aio_context(acb->bs), true); | |
4662 | } else { | |
4663 | abort(); | |
02c50efe | 4664 | } |
02c50efe | 4665 | } |
8007429a | 4666 | qemu_aio_unref(acb); |
02c50efe FZ |
4667 | } |
4668 | ||
4669 | /* Async version of aio cancel. The caller is not blocked if the acb implements | |
4670 | * cancel_async, otherwise we do nothing and let the request normally complete. | |
4671 | * In either case the completion callback must be called. */ | |
7c84b1b8 | 4672 | void bdrv_aio_cancel_async(BlockAIOCB *acb) |
02c50efe FZ |
4673 | { |
4674 | if (acb->aiocb_info->cancel_async) { | |
4675 | acb->aiocb_info->cancel_async(acb); | |
4676 | } | |
83f64091 FB |
4677 | } |
4678 | ||
4679 | /**************************************************************/ | |
4680 | /* async block device emulation */ | |
4681 | ||
7c84b1b8 MA |
4682 | typedef struct BlockAIOCBSync { |
4683 | BlockAIOCB common; | |
c16b5a2c CH |
4684 | QEMUBH *bh; |
4685 | int ret; | |
4686 | /* vector translation state */ | |
4687 | QEMUIOVector *qiov; | |
4688 | uint8_t *bounce; | |
4689 | int is_write; | |
7c84b1b8 | 4690 | } BlockAIOCBSync; |
c16b5a2c | 4691 | |
d7331bed | 4692 | static const AIOCBInfo bdrv_em_aiocb_info = { |
7c84b1b8 | 4693 | .aiocb_size = sizeof(BlockAIOCBSync), |
c16b5a2c CH |
4694 | }; |
4695 | ||
ce1a14dc | 4696 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4697 | { |
7c84b1b8 | 4698 | BlockAIOCBSync *acb = opaque; |
f141eafe | 4699 | |
857d4f46 | 4700 | if (!acb->is_write && acb->ret >= 0) { |
03396148 | 4701 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
857d4f46 | 4702 | } |
ceb42de8 | 4703 | qemu_vfree(acb->bounce); |
ce1a14dc | 4704 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4705 | qemu_bh_delete(acb->bh); |
36afc451 | 4706 | acb->bh = NULL; |
8007429a | 4707 | qemu_aio_unref(acb); |
83f64091 | 4708 | } |
beac80cd | 4709 | |
7c84b1b8 MA |
4710 | static BlockAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4711 | int64_t sector_num, | |
4712 | QEMUIOVector *qiov, | |
4713 | int nb_sectors, | |
097310b5 | 4714 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
4715 | void *opaque, |
4716 | int is_write) | |
f141eafe | 4717 | |
83f64091 | 4718 | { |
7c84b1b8 | 4719 | BlockAIOCBSync *acb; |
ce1a14dc | 4720 | |
d7331bed | 4721 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4722 | acb->is_write = is_write; |
4723 | acb->qiov = qiov; | |
857d4f46 | 4724 | acb->bounce = qemu_try_blockalign(bs, qiov->size); |
2572b37a | 4725 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
f141eafe | 4726 | |
857d4f46 KW |
4727 | if (acb->bounce == NULL) { |
4728 | acb->ret = -ENOMEM; | |
4729 | } else if (is_write) { | |
d5e6b161 | 4730 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4731 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4732 | } else { |
1ed20acf | 4733 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4734 | } |
4735 | ||
ce1a14dc | 4736 | qemu_bh_schedule(acb->bh); |
f141eafe | 4737 | |
ce1a14dc | 4738 | return &acb->common; |
beac80cd FB |
4739 | } |
4740 | ||
7c84b1b8 | 4741 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
f141eafe | 4742 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 4743 | BlockCompletionFunc *cb, void *opaque) |
beac80cd | 4744 | { |
f141eafe AL |
4745 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4746 | } | |
83f64091 | 4747 | |
7c84b1b8 | 4748 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
f141eafe | 4749 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 4750 | BlockCompletionFunc *cb, void *opaque) |
f141eafe AL |
4751 | { |
4752 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4753 | } |
beac80cd | 4754 | |
68485420 | 4755 | |
7c84b1b8 MA |
4756 | typedef struct BlockAIOCBCoroutine { |
4757 | BlockAIOCB common; | |
68485420 KW |
4758 | BlockRequest req; |
4759 | bool is_write; | |
d318aea9 | 4760 | bool *done; |
68485420 | 4761 | QEMUBH* bh; |
7c84b1b8 | 4762 | } BlockAIOCBCoroutine; |
68485420 | 4763 | |
d7331bed | 4764 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
7c84b1b8 | 4765 | .aiocb_size = sizeof(BlockAIOCBCoroutine), |
68485420 KW |
4766 | }; |
4767 | ||
35246a68 | 4768 | static void bdrv_co_em_bh(void *opaque) |
68485420 | 4769 | { |
7c84b1b8 | 4770 | BlockAIOCBCoroutine *acb = opaque; |
68485420 KW |
4771 | |
4772 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 | 4773 | |
68485420 | 4774 | qemu_bh_delete(acb->bh); |
8007429a | 4775 | qemu_aio_unref(acb); |
68485420 KW |
4776 | } |
4777 | ||
b2a61371 SH |
4778 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4779 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4780 | { | |
7c84b1b8 | 4781 | BlockAIOCBCoroutine *acb = opaque; |
b2a61371 SH |
4782 | BlockDriverState *bs = acb->common.bs; |
4783 | ||
4784 | if (!acb->is_write) { | |
4785 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4786 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4787 | } else { |
4788 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4789 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4790 | } |
4791 | ||
2572b37a | 4792 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2a61371 SH |
4793 | qemu_bh_schedule(acb->bh); |
4794 | } | |
4795 | ||
7c84b1b8 MA |
4796 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4797 | int64_t sector_num, | |
4798 | QEMUIOVector *qiov, | |
4799 | int nb_sectors, | |
4800 | BdrvRequestFlags flags, | |
097310b5 | 4801 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
4802 | void *opaque, |
4803 | bool is_write) | |
68485420 KW |
4804 | { |
4805 | Coroutine *co; | |
7c84b1b8 | 4806 | BlockAIOCBCoroutine *acb; |
68485420 | 4807 | |
d7331bed | 4808 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4809 | acb->req.sector = sector_num; |
4810 | acb->req.nb_sectors = nb_sectors; | |
4811 | acb->req.qiov = qiov; | |
d20d9b7c | 4812 | acb->req.flags = flags; |
68485420 KW |
4813 | acb->is_write = is_write; |
4814 | ||
8c5873d6 | 4815 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4816 | qemu_coroutine_enter(co, acb); |
4817 | ||
4818 | return &acb->common; | |
4819 | } | |
4820 | ||
07f07615 | 4821 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4822 | { |
7c84b1b8 | 4823 | BlockAIOCBCoroutine *acb = opaque; |
07f07615 | 4824 | BlockDriverState *bs = acb->common.bs; |
b2e12bc6 | 4825 | |
07f07615 | 4826 | acb->req.error = bdrv_co_flush(bs); |
2572b37a | 4827 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2e12bc6 | 4828 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4829 | } |
4830 | ||
7c84b1b8 | 4831 | BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
097310b5 | 4832 | BlockCompletionFunc *cb, void *opaque) |
016f5cf6 | 4833 | { |
07f07615 | 4834 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4835 | |
07f07615 | 4836 | Coroutine *co; |
7c84b1b8 | 4837 | BlockAIOCBCoroutine *acb; |
016f5cf6 | 4838 | |
d7331bed | 4839 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 | 4840 | |
07f07615 PB |
4841 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4842 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4843 | |
016f5cf6 AG |
4844 | return &acb->common; |
4845 | } | |
4846 | ||
4265d620 PB |
4847 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4848 | { | |
7c84b1b8 | 4849 | BlockAIOCBCoroutine *acb = opaque; |
4265d620 PB |
4850 | BlockDriverState *bs = acb->common.bs; |
4851 | ||
4852 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
2572b37a | 4853 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
4265d620 PB |
4854 | qemu_bh_schedule(acb->bh); |
4855 | } | |
4856 | ||
7c84b1b8 | 4857 | BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
4265d620 | 4858 | int64_t sector_num, int nb_sectors, |
097310b5 | 4859 | BlockCompletionFunc *cb, void *opaque) |
4265d620 PB |
4860 | { |
4861 | Coroutine *co; | |
7c84b1b8 | 4862 | BlockAIOCBCoroutine *acb; |
4265d620 PB |
4863 | |
4864 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4865 | ||
d7331bed | 4866 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4867 | acb->req.sector = sector_num; |
4868 | acb->req.nb_sectors = nb_sectors; | |
4869 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
4870 | qemu_coroutine_enter(co, acb); | |
4871 | ||
4872 | return &acb->common; | |
4873 | } | |
4874 | ||
ea2384d3 FB |
4875 | void bdrv_init(void) |
4876 | { | |
5efa9d5a | 4877 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4878 | } |
ce1a14dc | 4879 | |
eb852011 MA |
4880 | void bdrv_init_with_whitelist(void) |
4881 | { | |
4882 | use_bdrv_whitelist = 1; | |
4883 | bdrv_init(); | |
4884 | } | |
4885 | ||
d7331bed | 4886 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
097310b5 | 4887 | BlockCompletionFunc *cb, void *opaque) |
ce1a14dc | 4888 | { |
7c84b1b8 | 4889 | BlockAIOCB *acb; |
ce1a14dc | 4890 | |
d7331bed SH |
4891 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4892 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4893 | acb->bs = bs; |
4894 | acb->cb = cb; | |
4895 | acb->opaque = opaque; | |
f197fe2b | 4896 | acb->refcnt = 1; |
ce1a14dc PB |
4897 | return acb; |
4898 | } | |
4899 | ||
f197fe2b FZ |
4900 | void qemu_aio_ref(void *p) |
4901 | { | |
7c84b1b8 | 4902 | BlockAIOCB *acb = p; |
f197fe2b FZ |
4903 | acb->refcnt++; |
4904 | } | |
4905 | ||
8007429a | 4906 | void qemu_aio_unref(void *p) |
ce1a14dc | 4907 | { |
7c84b1b8 | 4908 | BlockAIOCB *acb = p; |
f197fe2b FZ |
4909 | assert(acb->refcnt > 0); |
4910 | if (--acb->refcnt == 0) { | |
4911 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); | |
4912 | } | |
ce1a14dc | 4913 | } |
19cb3738 | 4914 | |
f9f05dc5 KW |
4915 | /**************************************************************/ |
4916 | /* Coroutine block device emulation */ | |
4917 | ||
4918 | typedef struct CoroutineIOCompletion { | |
4919 | Coroutine *coroutine; | |
4920 | int ret; | |
4921 | } CoroutineIOCompletion; | |
4922 | ||
4923 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4924 | { | |
4925 | CoroutineIOCompletion *co = opaque; | |
4926 | ||
4927 | co->ret = ret; | |
4928 | qemu_coroutine_enter(co->coroutine, NULL); | |
4929 | } | |
4930 | ||
4931 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4932 | int nb_sectors, QEMUIOVector *iov, | |
4933 | bool is_write) | |
4934 | { | |
4935 | CoroutineIOCompletion co = { | |
4936 | .coroutine = qemu_coroutine_self(), | |
4937 | }; | |
7c84b1b8 | 4938 | BlockAIOCB *acb; |
f9f05dc5 KW |
4939 | |
4940 | if (is_write) { | |
a652d160 SH |
4941 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4942 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4943 | } else { |
a652d160 SH |
4944 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4945 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4946 | } |
4947 | ||
59370aaa | 4948 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4949 | if (!acb) { |
4950 | return -EIO; | |
4951 | } | |
4952 | qemu_coroutine_yield(); | |
4953 | ||
4954 | return co.ret; | |
4955 | } | |
4956 | ||
4957 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4958 | int64_t sector_num, int nb_sectors, | |
4959 | QEMUIOVector *iov) | |
4960 | { | |
4961 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4962 | } | |
4963 | ||
4964 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4965 | int64_t sector_num, int nb_sectors, | |
4966 | QEMUIOVector *iov) | |
4967 | { | |
4968 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4969 | } | |
4970 | ||
07f07615 | 4971 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4972 | { |
07f07615 PB |
4973 | RwCo *rwco = opaque; |
4974 | ||
4975 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4976 | } | |
4977 | ||
4978 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4979 | { | |
eb489bb1 KW |
4980 | int ret; |
4981 | ||
29cdb251 | 4982 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4983 | return 0; |
eb489bb1 KW |
4984 | } |
4985 | ||
ca716364 | 4986 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4987 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4988 | if (bs->drv->bdrv_co_flush_to_os) { |
4989 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4990 | if (ret < 0) { | |
4991 | return ret; | |
4992 | } | |
4993 | } | |
4994 | ||
ca716364 KW |
4995 | /* But don't actually force it to the disk with cache=unsafe */ |
4996 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4997 | goto flush_parent; |
ca716364 KW |
4998 | } |
4999 | ||
bf736fe3 | 5000 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 5001 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 5002 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 | 5003 | } else if (bs->drv->bdrv_aio_flush) { |
7c84b1b8 | 5004 | BlockAIOCB *acb; |
07f07615 PB |
5005 | CoroutineIOCompletion co = { |
5006 | .coroutine = qemu_coroutine_self(), | |
5007 | }; | |
5008 | ||
5009 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
5010 | if (acb == NULL) { | |
29cdb251 | 5011 | ret = -EIO; |
07f07615 PB |
5012 | } else { |
5013 | qemu_coroutine_yield(); | |
29cdb251 | 5014 | ret = co.ret; |
07f07615 | 5015 | } |
07f07615 PB |
5016 | } else { |
5017 | /* | |
5018 | * Some block drivers always operate in either writethrough or unsafe | |
5019 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
5020 | * know how the server works (because the behaviour is hardcoded or | |
5021 | * depends on server-side configuration), so we can't ensure that | |
5022 | * everything is safe on disk. Returning an error doesn't work because | |
5023 | * that would break guests even if the server operates in writethrough | |
5024 | * mode. | |
5025 | * | |
5026 | * Let's hope the user knows what he's doing. | |
5027 | */ | |
29cdb251 | 5028 | ret = 0; |
07f07615 | 5029 | } |
29cdb251 PB |
5030 | if (ret < 0) { |
5031 | return ret; | |
5032 | } | |
5033 | ||
5034 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
5035 | * in the case of cache=unsafe, so there are no useless flushes. | |
5036 | */ | |
d4c82329 | 5037 | flush_parent: |
29cdb251 | 5038 | return bdrv_co_flush(bs->file); |
07f07615 PB |
5039 | } |
5040 | ||
5a8a30db | 5041 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 5042 | { |
5a8a30db KW |
5043 | Error *local_err = NULL; |
5044 | int ret; | |
5045 | ||
3456a8d1 KW |
5046 | if (!bs->drv) { |
5047 | return; | |
5048 | } | |
5049 | ||
7ea2d269 AK |
5050 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
5051 | return; | |
5052 | } | |
5053 | bs->open_flags &= ~BDRV_O_INCOMING; | |
5054 | ||
3456a8d1 | 5055 | if (bs->drv->bdrv_invalidate_cache) { |
5a8a30db | 5056 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
3456a8d1 | 5057 | } else if (bs->file) { |
5a8a30db KW |
5058 | bdrv_invalidate_cache(bs->file, &local_err); |
5059 | } | |
5060 | if (local_err) { | |
5061 | error_propagate(errp, local_err); | |
5062 | return; | |
0f15423c | 5063 | } |
3456a8d1 | 5064 | |
5a8a30db KW |
5065 | ret = refresh_total_sectors(bs, bs->total_sectors); |
5066 | if (ret < 0) { | |
5067 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
5068 | return; | |
5069 | } | |
0f15423c AL |
5070 | } |
5071 | ||
5a8a30db | 5072 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c AL |
5073 | { |
5074 | BlockDriverState *bs; | |
5a8a30db | 5075 | Error *local_err = NULL; |
0f15423c | 5076 | |
dc364f4c | 5077 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
5078 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5079 | ||
5080 | aio_context_acquire(aio_context); | |
5a8a30db | 5081 | bdrv_invalidate_cache(bs, &local_err); |
ed78cda3 | 5082 | aio_context_release(aio_context); |
5a8a30db KW |
5083 | if (local_err) { |
5084 | error_propagate(errp, local_err); | |
5085 | return; | |
5086 | } | |
0f15423c AL |
5087 | } |
5088 | } | |
5089 | ||
07f07615 PB |
5090 | int bdrv_flush(BlockDriverState *bs) |
5091 | { | |
5092 | Coroutine *co; | |
5093 | RwCo rwco = { | |
5094 | .bs = bs, | |
5095 | .ret = NOT_DONE, | |
e7a8a783 | 5096 | }; |
e7a8a783 | 5097 | |
07f07615 PB |
5098 | if (qemu_in_coroutine()) { |
5099 | /* Fast-path if already in coroutine context */ | |
5100 | bdrv_flush_co_entry(&rwco); | |
5101 | } else { | |
2572b37a SH |
5102 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5103 | ||
07f07615 PB |
5104 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
5105 | qemu_coroutine_enter(co, &rwco); | |
5106 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5107 | aio_poll(aio_context, true); |
07f07615 | 5108 | } |
e7a8a783 | 5109 | } |
07f07615 PB |
5110 | |
5111 | return rwco.ret; | |
e7a8a783 KW |
5112 | } |
5113 | ||
775aa8b6 KW |
5114 | typedef struct DiscardCo { |
5115 | BlockDriverState *bs; | |
5116 | int64_t sector_num; | |
5117 | int nb_sectors; | |
5118 | int ret; | |
5119 | } DiscardCo; | |
4265d620 PB |
5120 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
5121 | { | |
775aa8b6 | 5122 | DiscardCo *rwco = opaque; |
4265d620 PB |
5123 | |
5124 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
5125 | } | |
5126 | ||
5127 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
5128 | int nb_sectors) | |
5129 | { | |
b9c64947 | 5130 | int max_discard, ret; |
d51e9fe5 | 5131 | |
4265d620 PB |
5132 | if (!bs->drv) { |
5133 | return -ENOMEDIUM; | |
b9c64947 HR |
5134 | } |
5135 | ||
5136 | ret = bdrv_check_request(bs, sector_num, nb_sectors); | |
5137 | if (ret < 0) { | |
5138 | return ret; | |
4265d620 PB |
5139 | } else if (bs->read_only) { |
5140 | return -EROFS; | |
df702c9b PB |
5141 | } |
5142 | ||
e4654d2d | 5143 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 5144 | |
9e8f1835 PB |
5145 | /* Do nothing if disabled. */ |
5146 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
5147 | return 0; | |
5148 | } | |
5149 | ||
d51e9fe5 PB |
5150 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
5151 | return 0; | |
5152 | } | |
6f14da52 | 5153 | |
75af1f34 | 5154 | max_discard = MIN_NON_ZERO(bs->bl.max_discard, BDRV_REQUEST_MAX_SECTORS); |
d51e9fe5 PB |
5155 | while (nb_sectors > 0) { |
5156 | int ret; | |
5157 | int num = nb_sectors; | |
6f14da52 | 5158 | |
d51e9fe5 PB |
5159 | /* align request */ |
5160 | if (bs->bl.discard_alignment && | |
5161 | num >= bs->bl.discard_alignment && | |
5162 | sector_num % bs->bl.discard_alignment) { | |
5163 | if (num > bs->bl.discard_alignment) { | |
5164 | num = bs->bl.discard_alignment; | |
6f14da52 | 5165 | } |
d51e9fe5 PB |
5166 | num -= sector_num % bs->bl.discard_alignment; |
5167 | } | |
6f14da52 | 5168 | |
d51e9fe5 PB |
5169 | /* limit request size */ |
5170 | if (num > max_discard) { | |
5171 | num = max_discard; | |
5172 | } | |
6f14da52 | 5173 | |
d51e9fe5 | 5174 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 5175 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 | 5176 | } else { |
7c84b1b8 | 5177 | BlockAIOCB *acb; |
d51e9fe5 PB |
5178 | CoroutineIOCompletion co = { |
5179 | .coroutine = qemu_coroutine_self(), | |
5180 | }; | |
5181 | ||
5182 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
5183 | bdrv_co_io_em_complete, &co); | |
5184 | if (acb == NULL) { | |
5185 | return -EIO; | |
5186 | } else { | |
5187 | qemu_coroutine_yield(); | |
5188 | ret = co.ret; | |
6f14da52 | 5189 | } |
6f14da52 | 5190 | } |
7ce21016 | 5191 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 5192 | return ret; |
4265d620 | 5193 | } |
d51e9fe5 PB |
5194 | |
5195 | sector_num += num; | |
5196 | nb_sectors -= num; | |
4265d620 | 5197 | } |
d51e9fe5 | 5198 | return 0; |
4265d620 PB |
5199 | } |
5200 | ||
5201 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
5202 | { | |
5203 | Coroutine *co; | |
775aa8b6 | 5204 | DiscardCo rwco = { |
4265d620 PB |
5205 | .bs = bs, |
5206 | .sector_num = sector_num, | |
5207 | .nb_sectors = nb_sectors, | |
5208 | .ret = NOT_DONE, | |
5209 | }; | |
5210 | ||
5211 | if (qemu_in_coroutine()) { | |
5212 | /* Fast-path if already in coroutine context */ | |
5213 | bdrv_discard_co_entry(&rwco); | |
5214 | } else { | |
2572b37a SH |
5215 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5216 | ||
4265d620 PB |
5217 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
5218 | qemu_coroutine_enter(co, &rwco); | |
5219 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5220 | aio_poll(aio_context, true); |
4265d620 PB |
5221 | } |
5222 | } | |
5223 | ||
5224 | return rwco.ret; | |
5225 | } | |
5226 | ||
19cb3738 FB |
5227 | /**************************************************************/ |
5228 | /* removable device support */ | |
5229 | ||
5230 | /** | |
5231 | * Return TRUE if the media is present | |
5232 | */ | |
5233 | int bdrv_is_inserted(BlockDriverState *bs) | |
5234 | { | |
5235 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 5236 | |
19cb3738 FB |
5237 | if (!drv) |
5238 | return 0; | |
5239 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
5240 | return 1; |
5241 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
5242 | } |
5243 | ||
5244 | /** | |
8e49ca46 MA |
5245 | * Return whether the media changed since the last call to this |
5246 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
5247 | */ |
5248 | int bdrv_media_changed(BlockDriverState *bs) | |
5249 | { | |
5250 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5251 | |
8e49ca46 MA |
5252 | if (drv && drv->bdrv_media_changed) { |
5253 | return drv->bdrv_media_changed(bs); | |
5254 | } | |
5255 | return -ENOTSUP; | |
19cb3738 FB |
5256 | } |
5257 | ||
5258 | /** | |
5259 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
5260 | */ | |
f36f3949 | 5261 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
5262 | { |
5263 | BlockDriver *drv = bs->drv; | |
bfb197e0 | 5264 | const char *device_name; |
19cb3738 | 5265 | |
822e1cd1 MA |
5266 | if (drv && drv->bdrv_eject) { |
5267 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 5268 | } |
6f382ed2 | 5269 | |
bfb197e0 MA |
5270 | device_name = bdrv_get_device_name(bs); |
5271 | if (device_name[0] != '\0') { | |
5272 | qapi_event_send_device_tray_moved(device_name, | |
a5ee7bd4 | 5273 | eject_flag, &error_abort); |
6f382ed2 | 5274 | } |
19cb3738 FB |
5275 | } |
5276 | ||
19cb3738 FB |
5277 | /** |
5278 | * Lock or unlock the media (if it is locked, the user won't be able | |
5279 | * to eject it manually). | |
5280 | */ | |
025e849a | 5281 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
5282 | { |
5283 | BlockDriver *drv = bs->drv; | |
5284 | ||
025e849a | 5285 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5286 | |
025e849a MA |
5287 | if (drv && drv->bdrv_lock_medium) { |
5288 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5289 | } |
5290 | } | |
985a03b0 TS |
5291 | |
5292 | /* needed for generic scsi interface */ | |
5293 | ||
5294 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5295 | { | |
5296 | BlockDriver *drv = bs->drv; | |
5297 | ||
5298 | if (drv && drv->bdrv_ioctl) | |
5299 | return drv->bdrv_ioctl(bs, req, buf); | |
5300 | return -ENOTSUP; | |
5301 | } | |
7d780669 | 5302 | |
7c84b1b8 | 5303 | BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
221f715d | 5304 | unsigned long int req, void *buf, |
097310b5 | 5305 | BlockCompletionFunc *cb, void *opaque) |
7d780669 | 5306 | { |
221f715d | 5307 | BlockDriver *drv = bs->drv; |
7d780669 | 5308 | |
221f715d AL |
5309 | if (drv && drv->bdrv_aio_ioctl) |
5310 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5311 | return NULL; | |
7d780669 | 5312 | } |
e268ca52 | 5313 | |
1b7fd729 | 5314 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5315 | { |
1b7fd729 | 5316 | bs->guest_block_size = align; |
7b6f9300 | 5317 | } |
7cd1e32a | 5318 | |
e268ca52 AL |
5319 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5320 | { | |
339064d5 | 5321 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5322 | } |
7cd1e32a | 5323 | |
9ebd8448 HR |
5324 | void *qemu_blockalign0(BlockDriverState *bs, size_t size) |
5325 | { | |
5326 | return memset(qemu_blockalign(bs, size), 0, size); | |
5327 | } | |
5328 | ||
7d2a35cc KW |
5329 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size) |
5330 | { | |
5331 | size_t align = bdrv_opt_mem_align(bs); | |
5332 | ||
5333 | /* Ensure that NULL is never returned on success */ | |
5334 | assert(align > 0); | |
5335 | if (size == 0) { | |
5336 | size = align; | |
5337 | } | |
5338 | ||
5339 | return qemu_try_memalign(align, size); | |
5340 | } | |
5341 | ||
9ebd8448 HR |
5342 | void *qemu_try_blockalign0(BlockDriverState *bs, size_t size) |
5343 | { | |
5344 | void *mem = qemu_try_blockalign(bs, size); | |
5345 | ||
5346 | if (mem) { | |
5347 | memset(mem, 0, size); | |
5348 | } | |
5349 | ||
5350 | return mem; | |
5351 | } | |
5352 | ||
c53b1c51 SH |
5353 | /* |
5354 | * Check if all memory in this vector is sector aligned. | |
5355 | */ | |
5356 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5357 | { | |
5358 | int i; | |
339064d5 | 5359 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5360 | |
5361 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5362 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5363 | return false; |
1ff735bd | 5364 | } |
339064d5 | 5365 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5366 | return false; |
c53b1c51 SH |
5367 | } |
5368 | } | |
5369 | ||
5370 | return true; | |
5371 | } | |
5372 | ||
b8afb520 FZ |
5373 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
5374 | Error **errp) | |
7cd1e32a LS |
5375 | { |
5376 | int64_t bitmap_size; | |
e4654d2d | 5377 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 5378 | |
50717e94 PB |
5379 | assert((granularity & (granularity - 1)) == 0); |
5380 | ||
e4654d2d FZ |
5381 | granularity >>= BDRV_SECTOR_BITS; |
5382 | assert(granularity); | |
57322b78 | 5383 | bitmap_size = bdrv_nb_sectors(bs); |
b8afb520 FZ |
5384 | if (bitmap_size < 0) { |
5385 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); | |
5386 | errno = -bitmap_size; | |
5387 | return NULL; | |
5388 | } | |
5839e53b | 5389 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
e4654d2d FZ |
5390 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); |
5391 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
5392 | return bitmap; | |
5393 | } | |
5394 | ||
5395 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
5396 | { | |
5397 | BdrvDirtyBitmap *bm, *next; | |
5398 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5399 | if (bm == bitmap) { | |
5400 | QLIST_REMOVE(bitmap, list); | |
5401 | hbitmap_free(bitmap->bitmap); | |
5402 | g_free(bitmap); | |
5403 | return; | |
a55eb92c | 5404 | } |
7cd1e32a LS |
5405 | } |
5406 | } | |
5407 | ||
21b56835 FZ |
5408 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5409 | { | |
5410 | BdrvDirtyBitmap *bm; | |
5411 | BlockDirtyInfoList *list = NULL; | |
5412 | BlockDirtyInfoList **plist = &list; | |
5413 | ||
5414 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5839e53b MA |
5415 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
5416 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); | |
21b56835 FZ |
5417 | info->count = bdrv_get_dirty_count(bs, bm); |
5418 | info->granularity = | |
5419 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
5420 | entry->value = info; | |
5421 | *plist = entry; | |
5422 | plist = &entry->next; | |
5423 | } | |
5424 | ||
5425 | return list; | |
5426 | } | |
5427 | ||
e4654d2d | 5428 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5429 | { |
e4654d2d FZ |
5430 | if (bitmap) { |
5431 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5432 | } else { |
5433 | return 0; | |
5434 | } | |
5435 | } | |
5436 | ||
e4654d2d FZ |
5437 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
5438 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 5439 | { |
e4654d2d | 5440 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5441 | } |
5442 | ||
c4237dfa VSO |
5443 | void bdrv_set_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, |
5444 | int64_t cur_sector, int nr_sectors) | |
5445 | { | |
5446 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5447 | } | |
5448 | ||
5449 | void bdrv_reset_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, | |
5450 | int64_t cur_sector, int nr_sectors) | |
5451 | { | |
5452 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5453 | } | |
5454 | ||
5455 | static void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
5456 | int nr_sectors) | |
1755da16 | 5457 | { |
e4654d2d FZ |
5458 | BdrvDirtyBitmap *bitmap; |
5459 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5460 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5461 | } | |
1755da16 PB |
5462 | } |
5463 | ||
c4237dfa VSO |
5464 | static void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
5465 | int nr_sectors) | |
7cd1e32a | 5466 | { |
e4654d2d FZ |
5467 | BdrvDirtyBitmap *bitmap; |
5468 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5469 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5470 | } | |
7cd1e32a | 5471 | } |
aaa0eb75 | 5472 | |
e4654d2d | 5473 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5474 | { |
e4654d2d | 5475 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5476 | } |
f88e1a42 | 5477 | |
9fcb0251 FZ |
5478 | /* Get a reference to bs */ |
5479 | void bdrv_ref(BlockDriverState *bs) | |
5480 | { | |
5481 | bs->refcnt++; | |
5482 | } | |
5483 | ||
5484 | /* Release a previously grabbed reference to bs. | |
5485 | * If after releasing, reference count is zero, the BlockDriverState is | |
5486 | * deleted. */ | |
5487 | void bdrv_unref(BlockDriverState *bs) | |
5488 | { | |
9a4d5ca6 JC |
5489 | if (!bs) { |
5490 | return; | |
5491 | } | |
9fcb0251 FZ |
5492 | assert(bs->refcnt > 0); |
5493 | if (--bs->refcnt == 0) { | |
5494 | bdrv_delete(bs); | |
5495 | } | |
5496 | } | |
5497 | ||
fbe40ff7 FZ |
5498 | struct BdrvOpBlocker { |
5499 | Error *reason; | |
5500 | QLIST_ENTRY(BdrvOpBlocker) list; | |
5501 | }; | |
5502 | ||
5503 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
5504 | { | |
5505 | BdrvOpBlocker *blocker; | |
5506 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5507 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
5508 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
5509 | if (errp) { | |
5510 | error_setg(errp, "Device '%s' is busy: %s", | |
bfb197e0 MA |
5511 | bdrv_get_device_name(bs), |
5512 | error_get_pretty(blocker->reason)); | |
fbe40ff7 FZ |
5513 | } |
5514 | return true; | |
5515 | } | |
5516 | return false; | |
5517 | } | |
5518 | ||
5519 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5520 | { | |
5521 | BdrvOpBlocker *blocker; | |
5522 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5523 | ||
5839e53b | 5524 | blocker = g_new0(BdrvOpBlocker, 1); |
fbe40ff7 FZ |
5525 | blocker->reason = reason; |
5526 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
5527 | } | |
5528 | ||
5529 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5530 | { | |
5531 | BdrvOpBlocker *blocker, *next; | |
5532 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5533 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
5534 | if (blocker->reason == reason) { | |
5535 | QLIST_REMOVE(blocker, list); | |
5536 | g_free(blocker); | |
5537 | } | |
5538 | } | |
5539 | } | |
5540 | ||
5541 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
5542 | { | |
5543 | int i; | |
5544 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5545 | bdrv_op_block(bs, i, reason); | |
5546 | } | |
5547 | } | |
5548 | ||
5549 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
5550 | { | |
5551 | int i; | |
5552 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5553 | bdrv_op_unblock(bs, i, reason); | |
5554 | } | |
5555 | } | |
5556 | ||
5557 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
5558 | { | |
5559 | int i; | |
5560 | ||
5561 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5562 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
5563 | return false; | |
5564 | } | |
5565 | } | |
5566 | return true; | |
5567 | } | |
5568 | ||
28a7282a LC |
5569 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5570 | { | |
d6bf279e | 5571 | bs->iostatus_enabled = true; |
58e21ef5 | 5572 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5573 | } |
5574 | ||
5575 | /* The I/O status is only enabled if the drive explicitly | |
5576 | * enables it _and_ the VM is configured to stop on errors */ | |
5577 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5578 | { | |
d6bf279e | 5579 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5580 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5581 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5582 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5583 | } |
5584 | ||
5585 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5586 | { | |
d6bf279e | 5587 | bs->iostatus_enabled = false; |
28a7282a LC |
5588 | } |
5589 | ||
5590 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5591 | { | |
5592 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5593 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5594 | if (bs->job) { |
5595 | block_job_iostatus_reset(bs->job); | |
5596 | } | |
28a7282a LC |
5597 | } |
5598 | } | |
5599 | ||
28a7282a LC |
5600 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5601 | { | |
3e1caa5f PB |
5602 | assert(bdrv_iostatus_is_enabled(bs)); |
5603 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5604 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5605 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5606 | } |
5607 | } | |
5608 | ||
d92ada22 LC |
5609 | void bdrv_img_create(const char *filename, const char *fmt, |
5610 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5611 | char *options, uint64_t img_size, int flags, |
5612 | Error **errp, bool quiet) | |
f88e1a42 | 5613 | { |
83d0521a CL |
5614 | QemuOptsList *create_opts = NULL; |
5615 | QemuOpts *opts = NULL; | |
5616 | const char *backing_fmt, *backing_file; | |
5617 | int64_t size; | |
f88e1a42 | 5618 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5619 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5620 | Error *local_err = NULL; |
f88e1a42 JS |
5621 | int ret = 0; |
5622 | ||
5623 | /* Find driver and parse its options */ | |
5624 | drv = bdrv_find_format(fmt); | |
5625 | if (!drv) { | |
71c79813 | 5626 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5627 | return; |
f88e1a42 JS |
5628 | } |
5629 | ||
b65a5e12 | 5630 | proto_drv = bdrv_find_protocol(filename, true, errp); |
f88e1a42 | 5631 | if (!proto_drv) { |
d92ada22 | 5632 | return; |
f88e1a42 JS |
5633 | } |
5634 | ||
c6149724 HR |
5635 | if (!drv->create_opts) { |
5636 | error_setg(errp, "Format driver '%s' does not support image creation", | |
5637 | drv->format_name); | |
5638 | return; | |
5639 | } | |
5640 | ||
5641 | if (!proto_drv->create_opts) { | |
5642 | error_setg(errp, "Protocol driver '%s' does not support image creation", | |
5643 | proto_drv->format_name); | |
5644 | return; | |
5645 | } | |
5646 | ||
c282e1fd CL |
5647 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
5648 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); | |
f88e1a42 JS |
5649 | |
5650 | /* Create parameter list with default values */ | |
83d0521a | 5651 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
39101f25 | 5652 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
f88e1a42 JS |
5653 | |
5654 | /* Parse -o options */ | |
5655 | if (options) { | |
dc523cd3 MA |
5656 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
5657 | if (local_err) { | |
5658 | error_report_err(local_err); | |
5659 | local_err = NULL; | |
83d0521a | 5660 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
f88e1a42 JS |
5661 | goto out; |
5662 | } | |
5663 | } | |
5664 | ||
5665 | if (base_filename) { | |
f43e47db | 5666 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
6be4194b | 5667 | if (local_err) { |
71c79813 LC |
5668 | error_setg(errp, "Backing file not supported for file format '%s'", |
5669 | fmt); | |
f88e1a42 JS |
5670 | goto out; |
5671 | } | |
5672 | } | |
5673 | ||
5674 | if (base_fmt) { | |
f43e47db | 5675 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
6be4194b | 5676 | if (local_err) { |
71c79813 LC |
5677 | error_setg(errp, "Backing file format not supported for file " |
5678 | "format '%s'", fmt); | |
f88e1a42 JS |
5679 | goto out; |
5680 | } | |
5681 | } | |
5682 | ||
83d0521a CL |
5683 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
5684 | if (backing_file) { | |
5685 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
5686 | error_setg(errp, "Error: Trying to create an image with the " |
5687 | "same filename as the backing file"); | |
792da93a JS |
5688 | goto out; |
5689 | } | |
5690 | } | |
5691 | ||
83d0521a CL |
5692 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
5693 | if (backing_fmt) { | |
5694 | backing_drv = bdrv_find_format(backing_fmt); | |
96df67d1 | 5695 | if (!backing_drv) { |
71c79813 | 5696 | error_setg(errp, "Unknown backing file format '%s'", |
83d0521a | 5697 | backing_fmt); |
f88e1a42 JS |
5698 | goto out; |
5699 | } | |
5700 | } | |
5701 | ||
5702 | // The size for the image must always be specified, with one exception: | |
5703 | // If we are using a backing file, we can obtain the size from there | |
83d0521a CL |
5704 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
5705 | if (size == -1) { | |
5706 | if (backing_file) { | |
66f6b814 | 5707 | BlockDriverState *bs; |
29168018 | 5708 | char *full_backing = g_new0(char, PATH_MAX); |
52bf1e72 | 5709 | int64_t size; |
63090dac PB |
5710 | int back_flags; |
5711 | ||
29168018 HR |
5712 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
5713 | full_backing, PATH_MAX, | |
5714 | &local_err); | |
5715 | if (local_err) { | |
5716 | g_free(full_backing); | |
5717 | goto out; | |
5718 | } | |
5719 | ||
63090dac PB |
5720 | /* backing files always opened read-only */ |
5721 | back_flags = | |
5722 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5723 | |
f67503e5 | 5724 | bs = NULL; |
29168018 | 5725 | ret = bdrv_open(&bs, full_backing, NULL, NULL, back_flags, |
cc84d90f | 5726 | backing_drv, &local_err); |
29168018 | 5727 | g_free(full_backing); |
f88e1a42 | 5728 | if (ret < 0) { |
f88e1a42 JS |
5729 | goto out; |
5730 | } | |
52bf1e72 MA |
5731 | size = bdrv_getlength(bs); |
5732 | if (size < 0) { | |
5733 | error_setg_errno(errp, -size, "Could not get size of '%s'", | |
5734 | backing_file); | |
5735 | bdrv_unref(bs); | |
5736 | goto out; | |
5737 | } | |
f88e1a42 | 5738 | |
39101f25 | 5739 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
66f6b814 HR |
5740 | |
5741 | bdrv_unref(bs); | |
f88e1a42 | 5742 | } else { |
71c79813 | 5743 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5744 | goto out; |
5745 | } | |
5746 | } | |
5747 | ||
f382d43a | 5748 | if (!quiet) { |
43c5d8f8 FZ |
5749 | printf("Formatting '%s', fmt=%s", filename, fmt); |
5750 | qemu_opts_print(opts, " "); | |
f382d43a MR |
5751 | puts(""); |
5752 | } | |
83d0521a | 5753 | |
c282e1fd | 5754 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 5755 | |
cc84d90f HR |
5756 | if (ret == -EFBIG) { |
5757 | /* This is generally a better message than whatever the driver would | |
5758 | * deliver (especially because of the cluster_size_hint), since that | |
5759 | * is most probably not much different from "image too large". */ | |
5760 | const char *cluster_size_hint = ""; | |
83d0521a | 5761 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 5762 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 5763 | } |
cc84d90f HR |
5764 | error_setg(errp, "The image size is too large for file format '%s'" |
5765 | "%s", fmt, cluster_size_hint); | |
5766 | error_free(local_err); | |
5767 | local_err = NULL; | |
f88e1a42 JS |
5768 | } |
5769 | ||
5770 | out: | |
83d0521a CL |
5771 | qemu_opts_del(opts); |
5772 | qemu_opts_free(create_opts); | |
84d18f06 | 5773 | if (local_err) { |
cc84d90f HR |
5774 | error_propagate(errp, local_err); |
5775 | } | |
f88e1a42 | 5776 | } |
85d126f3 SH |
5777 | |
5778 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5779 | { | |
dcd04228 SH |
5780 | return bs->aio_context; |
5781 | } | |
5782 | ||
5783 | void bdrv_detach_aio_context(BlockDriverState *bs) | |
5784 | { | |
33384421 HR |
5785 | BdrvAioNotifier *baf; |
5786 | ||
dcd04228 SH |
5787 | if (!bs->drv) { |
5788 | return; | |
5789 | } | |
5790 | ||
33384421 HR |
5791 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
5792 | baf->detach_aio_context(baf->opaque); | |
5793 | } | |
5794 | ||
13af91eb SH |
5795 | if (bs->io_limits_enabled) { |
5796 | throttle_detach_aio_context(&bs->throttle_state); | |
5797 | } | |
dcd04228 SH |
5798 | if (bs->drv->bdrv_detach_aio_context) { |
5799 | bs->drv->bdrv_detach_aio_context(bs); | |
5800 | } | |
5801 | if (bs->file) { | |
5802 | bdrv_detach_aio_context(bs->file); | |
5803 | } | |
5804 | if (bs->backing_hd) { | |
5805 | bdrv_detach_aio_context(bs->backing_hd); | |
5806 | } | |
5807 | ||
5808 | bs->aio_context = NULL; | |
5809 | } | |
5810 | ||
5811 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
5812 | AioContext *new_context) | |
5813 | { | |
33384421 HR |
5814 | BdrvAioNotifier *ban; |
5815 | ||
dcd04228 SH |
5816 | if (!bs->drv) { |
5817 | return; | |
5818 | } | |
5819 | ||
5820 | bs->aio_context = new_context; | |
5821 | ||
5822 | if (bs->backing_hd) { | |
5823 | bdrv_attach_aio_context(bs->backing_hd, new_context); | |
5824 | } | |
5825 | if (bs->file) { | |
5826 | bdrv_attach_aio_context(bs->file, new_context); | |
5827 | } | |
5828 | if (bs->drv->bdrv_attach_aio_context) { | |
5829 | bs->drv->bdrv_attach_aio_context(bs, new_context); | |
5830 | } | |
13af91eb SH |
5831 | if (bs->io_limits_enabled) { |
5832 | throttle_attach_aio_context(&bs->throttle_state, new_context); | |
5833 | } | |
33384421 HR |
5834 | |
5835 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { | |
5836 | ban->attached_aio_context(new_context, ban->opaque); | |
5837 | } | |
dcd04228 SH |
5838 | } |
5839 | ||
5840 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) | |
5841 | { | |
5842 | bdrv_drain_all(); /* ensure there are no in-flight requests */ | |
5843 | ||
5844 | bdrv_detach_aio_context(bs); | |
5845 | ||
5846 | /* This function executes in the old AioContext so acquire the new one in | |
5847 | * case it runs in a different thread. | |
5848 | */ | |
5849 | aio_context_acquire(new_context); | |
5850 | bdrv_attach_aio_context(bs, new_context); | |
5851 | aio_context_release(new_context); | |
85d126f3 | 5852 | } |
d616b224 | 5853 | |
33384421 HR |
5854 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
5855 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
5856 | void (*detach_aio_context)(void *opaque), void *opaque) | |
5857 | { | |
5858 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); | |
5859 | *ban = (BdrvAioNotifier){ | |
5860 | .attached_aio_context = attached_aio_context, | |
5861 | .detach_aio_context = detach_aio_context, | |
5862 | .opaque = opaque | |
5863 | }; | |
5864 | ||
5865 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); | |
5866 | } | |
5867 | ||
5868 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
5869 | void (*attached_aio_context)(AioContext *, | |
5870 | void *), | |
5871 | void (*detach_aio_context)(void *), | |
5872 | void *opaque) | |
5873 | { | |
5874 | BdrvAioNotifier *ban, *ban_next; | |
5875 | ||
5876 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
5877 | if (ban->attached_aio_context == attached_aio_context && | |
5878 | ban->detach_aio_context == detach_aio_context && | |
5879 | ban->opaque == opaque) | |
5880 | { | |
5881 | QLIST_REMOVE(ban, list); | |
5882 | g_free(ban); | |
5883 | ||
5884 | return; | |
5885 | } | |
5886 | } | |
5887 | ||
5888 | abort(); | |
5889 | } | |
5890 | ||
d616b224 SH |
5891 | void bdrv_add_before_write_notifier(BlockDriverState *bs, |
5892 | NotifierWithReturn *notifier) | |
5893 | { | |
5894 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5895 | } | |
6f176b48 | 5896 | |
77485434 HR |
5897 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
5898 | BlockDriverAmendStatusCB *status_cb) | |
6f176b48 | 5899 | { |
c282e1fd | 5900 | if (!bs->drv->bdrv_amend_options) { |
6f176b48 HR |
5901 | return -ENOTSUP; |
5902 | } | |
77485434 | 5903 | return bs->drv->bdrv_amend_options(bs, opts, status_cb); |
6f176b48 | 5904 | } |
f6186f49 | 5905 | |
b5042a36 BC |
5906 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
5907 | * of block filter and by bdrv_is_first_non_filter. | |
5908 | * It is used to test if the given bs is the candidate or recurse more in the | |
5909 | * node graph. | |
212a5a8f | 5910 | */ |
b5042a36 | 5911 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 5912 | BlockDriverState *candidate) |
f6186f49 | 5913 | { |
b5042a36 BC |
5914 | /* return false if basic checks fails */ |
5915 | if (!bs || !bs->drv) { | |
212a5a8f | 5916 | return false; |
f6186f49 BC |
5917 | } |
5918 | ||
b5042a36 BC |
5919 | /* the code reached a non block filter driver -> check if the bs is |
5920 | * the same as the candidate. It's the recursion termination condition. | |
5921 | */ | |
5922 | if (!bs->drv->is_filter) { | |
5923 | return bs == candidate; | |
212a5a8f | 5924 | } |
b5042a36 | 5925 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 5926 | |
b5042a36 BC |
5927 | /* If the block filter recursion method is defined use it to recurse down |
5928 | * the node graph. | |
5929 | */ | |
5930 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 5931 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5932 | } |
5933 | ||
b5042a36 BC |
5934 | /* the driver is a block filter but don't allow to recurse -> return false |
5935 | */ | |
5936 | return false; | |
f6186f49 BC |
5937 | } |
5938 | ||
212a5a8f BC |
5939 | /* This function checks if the candidate is the first non filter bs down it's |
5940 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5941 | * from the top. Some filters can choose not to pass down the recursion. | |
5942 | */ | |
5943 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5944 | { |
212a5a8f BC |
5945 | BlockDriverState *bs; |
5946 | ||
5947 | /* walk down the bs forest recursively */ | |
5948 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5949 | bool perm; | |
5950 | ||
b5042a36 | 5951 | /* try to recurse in this top level bs */ |
e6dc8a1f | 5952 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
5953 | |
5954 | /* candidate is the first non filter */ | |
5955 | if (perm) { | |
5956 | return true; | |
5957 | } | |
5958 | } | |
5959 | ||
5960 | return false; | |
f6186f49 | 5961 | } |
09158f00 BC |
5962 | |
5963 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) | |
5964 | { | |
5965 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5a7e7a0b SH |
5966 | AioContext *aio_context; |
5967 | ||
09158f00 BC |
5968 | if (!to_replace_bs) { |
5969 | error_setg(errp, "Node name '%s' not found", node_name); | |
5970 | return NULL; | |
5971 | } | |
5972 | ||
5a7e7a0b SH |
5973 | aio_context = bdrv_get_aio_context(to_replace_bs); |
5974 | aio_context_acquire(aio_context); | |
5975 | ||
09158f00 | 5976 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
5a7e7a0b SH |
5977 | to_replace_bs = NULL; |
5978 | goto out; | |
09158f00 BC |
5979 | } |
5980 | ||
5981 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
5982 | * most non filter in order to prevent data corruption. | |
5983 | * Another benefit is that this tests exclude backing files which are | |
5984 | * blocked by the backing blockers. | |
5985 | */ | |
5986 | if (!bdrv_is_first_non_filter(to_replace_bs)) { | |
5987 | error_setg(errp, "Only top most non filter can be replaced"); | |
5a7e7a0b SH |
5988 | to_replace_bs = NULL; |
5989 | goto out; | |
09158f00 BC |
5990 | } |
5991 | ||
5a7e7a0b SH |
5992 | out: |
5993 | aio_context_release(aio_context); | |
09158f00 BC |
5994 | return to_replace_bs; |
5995 | } | |
448ad91d ML |
5996 | |
5997 | void bdrv_io_plug(BlockDriverState *bs) | |
5998 | { | |
5999 | BlockDriver *drv = bs->drv; | |
6000 | if (drv && drv->bdrv_io_plug) { | |
6001 | drv->bdrv_io_plug(bs); | |
6002 | } else if (bs->file) { | |
6003 | bdrv_io_plug(bs->file); | |
6004 | } | |
6005 | } | |
6006 | ||
6007 | void bdrv_io_unplug(BlockDriverState *bs) | |
6008 | { | |
6009 | BlockDriver *drv = bs->drv; | |
6010 | if (drv && drv->bdrv_io_unplug) { | |
6011 | drv->bdrv_io_unplug(bs); | |
6012 | } else if (bs->file) { | |
6013 | bdrv_io_unplug(bs->file); | |
6014 | } | |
6015 | } | |
6016 | ||
6017 | void bdrv_flush_io_queue(BlockDriverState *bs) | |
6018 | { | |
6019 | BlockDriver *drv = bs->drv; | |
6020 | if (drv && drv->bdrv_flush_io_queue) { | |
6021 | drv->bdrv_flush_io_queue(bs); | |
6022 | } else if (bs->file) { | |
6023 | bdrv_flush_io_queue(bs->file); | |
6024 | } | |
6025 | } | |
91af7014 HR |
6026 | |
6027 | static bool append_open_options(QDict *d, BlockDriverState *bs) | |
6028 | { | |
6029 | const QDictEntry *entry; | |
6030 | bool found_any = false; | |
6031 | ||
6032 | for (entry = qdict_first(bs->options); entry; | |
6033 | entry = qdict_next(bs->options, entry)) | |
6034 | { | |
6035 | /* Only take options for this level and exclude all non-driver-specific | |
6036 | * options */ | |
6037 | if (!strchr(qdict_entry_key(entry), '.') && | |
6038 | strcmp(qdict_entry_key(entry), "node-name")) | |
6039 | { | |
6040 | qobject_incref(qdict_entry_value(entry)); | |
6041 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); | |
6042 | found_any = true; | |
6043 | } | |
6044 | } | |
6045 | ||
6046 | return found_any; | |
6047 | } | |
6048 | ||
6049 | /* Updates the following BDS fields: | |
6050 | * - exact_filename: A filename which may be used for opening a block device | |
6051 | * which (mostly) equals the given BDS (even without any | |
6052 | * other options; so reading and writing must return the same | |
6053 | * results, but caching etc. may be different) | |
6054 | * - full_open_options: Options which, when given when opening a block device | |
6055 | * (without a filename), result in a BDS (mostly) | |
6056 | * equalling the given one | |
6057 | * - filename: If exact_filename is set, it is copied here. Otherwise, | |
6058 | * full_open_options is converted to a JSON object, prefixed with | |
6059 | * "json:" (for use through the JSON pseudo protocol) and put here. | |
6060 | */ | |
6061 | void bdrv_refresh_filename(BlockDriverState *bs) | |
6062 | { | |
6063 | BlockDriver *drv = bs->drv; | |
6064 | QDict *opts; | |
6065 | ||
6066 | if (!drv) { | |
6067 | return; | |
6068 | } | |
6069 | ||
6070 | /* This BDS's file name will most probably depend on its file's name, so | |
6071 | * refresh that first */ | |
6072 | if (bs->file) { | |
6073 | bdrv_refresh_filename(bs->file); | |
6074 | } | |
6075 | ||
6076 | if (drv->bdrv_refresh_filename) { | |
6077 | /* Obsolete information is of no use here, so drop the old file name | |
6078 | * information before refreshing it */ | |
6079 | bs->exact_filename[0] = '\0'; | |
6080 | if (bs->full_open_options) { | |
6081 | QDECREF(bs->full_open_options); | |
6082 | bs->full_open_options = NULL; | |
6083 | } | |
6084 | ||
6085 | drv->bdrv_refresh_filename(bs); | |
6086 | } else if (bs->file) { | |
6087 | /* Try to reconstruct valid information from the underlying file */ | |
6088 | bool has_open_options; | |
6089 | ||
6090 | bs->exact_filename[0] = '\0'; | |
6091 | if (bs->full_open_options) { | |
6092 | QDECREF(bs->full_open_options); | |
6093 | bs->full_open_options = NULL; | |
6094 | } | |
6095 | ||
6096 | opts = qdict_new(); | |
6097 | has_open_options = append_open_options(opts, bs); | |
6098 | ||
6099 | /* If no specific options have been given for this BDS, the filename of | |
6100 | * the underlying file should suffice for this one as well */ | |
6101 | if (bs->file->exact_filename[0] && !has_open_options) { | |
6102 | strcpy(bs->exact_filename, bs->file->exact_filename); | |
6103 | } | |
6104 | /* Reconstructing the full options QDict is simple for most format block | |
6105 | * drivers, as long as the full options are known for the underlying | |
6106 | * file BDS. The full options QDict of that file BDS should somehow | |
6107 | * contain a representation of the filename, therefore the following | |
6108 | * suffices without querying the (exact_)filename of this BDS. */ | |
6109 | if (bs->file->full_open_options) { | |
6110 | qdict_put_obj(opts, "driver", | |
6111 | QOBJECT(qstring_from_str(drv->format_name))); | |
6112 | QINCREF(bs->file->full_open_options); | |
6113 | qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); | |
6114 | ||
6115 | bs->full_open_options = opts; | |
6116 | } else { | |
6117 | QDECREF(opts); | |
6118 | } | |
6119 | } else if (!bs->full_open_options && qdict_size(bs->options)) { | |
6120 | /* There is no underlying file BDS (at least referenced by BDS.file), | |
6121 | * so the full options QDict should be equal to the options given | |
6122 | * specifically for this block device when it was opened (plus the | |
6123 | * driver specification). | |
6124 | * Because those options don't change, there is no need to update | |
6125 | * full_open_options when it's already set. */ | |
6126 | ||
6127 | opts = qdict_new(); | |
6128 | append_open_options(opts, bs); | |
6129 | qdict_put_obj(opts, "driver", | |
6130 | QOBJECT(qstring_from_str(drv->format_name))); | |
6131 | ||
6132 | if (bs->exact_filename[0]) { | |
6133 | /* This may not work for all block protocol drivers (some may | |
6134 | * require this filename to be parsed), but we have to find some | |
6135 | * default solution here, so just include it. If some block driver | |
6136 | * does not support pure options without any filename at all or | |
6137 | * needs some special format of the options QDict, it needs to | |
6138 | * implement the driver-specific bdrv_refresh_filename() function. | |
6139 | */ | |
6140 | qdict_put_obj(opts, "filename", | |
6141 | QOBJECT(qstring_from_str(bs->exact_filename))); | |
6142 | } | |
6143 | ||
6144 | bs->full_open_options = opts; | |
6145 | } | |
6146 | ||
6147 | if (bs->exact_filename[0]) { | |
6148 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); | |
6149 | } else if (bs->full_open_options) { | |
6150 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); | |
6151 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", | |
6152 | qstring_get_str(json)); | |
6153 | QDECREF(json); | |
6154 | } | |
6155 | } | |
5366d0c8 BC |
6156 | |
6157 | /* This accessor function purpose is to allow the device models to access the | |
6158 | * BlockAcctStats structure embedded inside a BlockDriverState without being | |
6159 | * aware of the BlockDriverState structure layout. | |
6160 | * It will go away when the BlockAcctStats structure will be moved inside | |
6161 | * the device models. | |
6162 | */ | |
6163 | BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) | |
6164 | { | |
6165 | return &bs->stats; | |
6166 | } |