]>
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" |
de50a20a | 33 | #include "sysemu/qtest.h" |
1de7afc9 | 34 | #include "qemu/notify.h" |
737e150e | 35 | #include "block/coroutine.h" |
c13163fb | 36 | #include "block/qapi.h" |
b2023818 | 37 | #include "qmp-commands.h" |
1de7afc9 | 38 | #include "qemu/timer.h" |
a5ee7bd4 | 39 | #include "qapi-event.h" |
fc01f7e7 | 40 | |
71e72a19 | 41 | #ifdef CONFIG_BSD |
7674e7bf FB |
42 | #include <sys/types.h> |
43 | #include <sys/stat.h> | |
44 | #include <sys/ioctl.h> | |
72cf2d4f | 45 | #include <sys/queue.h> |
c5e97233 | 46 | #ifndef __DragonFly__ |
7674e7bf FB |
47 | #include <sys/disk.h> |
48 | #endif | |
c5e97233 | 49 | #endif |
7674e7bf | 50 | |
49dc768d AL |
51 | #ifdef _WIN32 |
52 | #include <windows.h> | |
53 | #endif | |
54 | ||
9bd2b08f JS |
55 | /** |
56 | * A BdrvDirtyBitmap can be in three possible states: | |
57 | * (1) successor is NULL and disabled is false: full r/w mode | |
58 | * (2) successor is NULL and disabled is true: read only mode ("disabled") | |
59 | * (3) successor is set: frozen mode. | |
60 | * A frozen bitmap cannot be renamed, deleted, anonymized, cleared, set, | |
61 | * or enabled. A frozen bitmap can only abdicate() or reclaim(). | |
62 | */ | |
e4654d2d | 63 | struct BdrvDirtyBitmap { |
aa0c7ca5 JS |
64 | HBitmap *bitmap; /* Dirty sector bitmap implementation */ |
65 | BdrvDirtyBitmap *successor; /* Anonymous child; implies frozen status */ | |
66 | char *name; /* Optional non-empty unique ID */ | |
67 | int64_t size; /* Size of the bitmap (Number of sectors) */ | |
68 | bool disabled; /* Bitmap is read-only */ | |
e4654d2d FZ |
69 | QLIST_ENTRY(BdrvDirtyBitmap) list; |
70 | }; | |
71 | ||
1c9805a3 SH |
72 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
73 | ||
7c84b1b8 | 74 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
f141eafe | 75 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 76 | BlockCompletionFunc *cb, void *opaque); |
7c84b1b8 | 77 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
f141eafe | 78 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 79 | BlockCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
80 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
81 | int64_t sector_num, int nb_sectors, | |
82 | QEMUIOVector *iov); | |
83 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
84 | int64_t sector_num, int nb_sectors, | |
85 | QEMUIOVector *iov); | |
775aa8b6 KW |
86 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
87 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
470c0504 | 88 | BdrvRequestFlags flags); |
775aa8b6 KW |
89 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
90 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
f08f2dda | 91 | BdrvRequestFlags flags); |
7c84b1b8 MA |
92 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
93 | int64_t sector_num, | |
94 | QEMUIOVector *qiov, | |
95 | int nb_sectors, | |
96 | BdrvRequestFlags flags, | |
097310b5 | 97 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
98 | void *opaque, |
99 | bool is_write); | |
b2a61371 | 100 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 101 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 102 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 103 | |
1b7bdbc1 SH |
104 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
105 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 106 | |
dc364f4c BC |
107 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
108 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
109 | ||
8a22f02a SH |
110 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
111 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 112 | |
ce1ffea8 | 113 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs); |
eb852011 MA |
114 | /* If non-zero, use only whitelisted block drivers */ |
115 | static int use_bdrv_whitelist; | |
116 | ||
9e0b22f4 SH |
117 | #ifdef _WIN32 |
118 | static int is_windows_drive_prefix(const char *filename) | |
119 | { | |
120 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
121 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
122 | filename[1] == ':'); | |
123 | } | |
124 | ||
125 | int is_windows_drive(const char *filename) | |
126 | { | |
127 | if (is_windows_drive_prefix(filename) && | |
128 | filename[2] == '\0') | |
129 | return 1; | |
130 | if (strstart(filename, "\\\\.\\", NULL) || | |
131 | strstart(filename, "//./", NULL)) | |
132 | return 1; | |
133 | return 0; | |
134 | } | |
135 | #endif | |
136 | ||
0563e191 | 137 | /* throttling disk I/O limits */ |
cc0681c4 BC |
138 | void bdrv_set_io_limits(BlockDriverState *bs, |
139 | ThrottleConfig *cfg) | |
98f90dba | 140 | { |
cc0681c4 | 141 | int i; |
98f90dba | 142 | |
cc0681c4 | 143 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 144 | |
cc0681c4 BC |
145 | for (i = 0; i < 2; i++) { |
146 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 147 | } |
cc0681c4 BC |
148 | } |
149 | ||
150 | /* this function drain all the throttled IOs */ | |
151 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
152 | { | |
153 | bool drained = false; | |
154 | bool enabled = bs->io_limits_enabled; | |
155 | int i; | |
156 | ||
157 | bs->io_limits_enabled = false; | |
158 | ||
159 | for (i = 0; i < 2; i++) { | |
160 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
161 | drained = true; | |
162 | } | |
163 | } | |
164 | ||
165 | bs->io_limits_enabled = enabled; | |
98f90dba | 166 | |
cc0681c4 | 167 | return drained; |
98f90dba ZYW |
168 | } |
169 | ||
cc0681c4 | 170 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 171 | { |
cc0681c4 | 172 | bs->io_limits_enabled = false; |
0563e191 | 173 | |
cc0681c4 BC |
174 | bdrv_start_throttled_reqs(bs); |
175 | ||
176 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
177 | } |
178 | ||
cc0681c4 | 179 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 180 | { |
cc0681c4 BC |
181 | BlockDriverState *bs = opaque; |
182 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
183 | } |
184 | ||
cc0681c4 | 185 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 186 | { |
cc0681c4 BC |
187 | BlockDriverState *bs = opaque; |
188 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
189 | } |
190 | ||
cc0681c4 BC |
191 | /* should be called before bdrv_set_io_limits if a limit is set */ |
192 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
193 | { | |
de50a20a FZ |
194 | int clock_type = QEMU_CLOCK_REALTIME; |
195 | ||
196 | if (qtest_enabled()) { | |
197 | /* For testing block IO throttling only */ | |
198 | clock_type = QEMU_CLOCK_VIRTUAL; | |
199 | } | |
cc0681c4 BC |
200 | assert(!bs->io_limits_enabled); |
201 | throttle_init(&bs->throttle_state, | |
13af91eb | 202 | bdrv_get_aio_context(bs), |
de50a20a | 203 | clock_type, |
cc0681c4 BC |
204 | bdrv_throttle_read_timer_cb, |
205 | bdrv_throttle_write_timer_cb, | |
206 | bs); | |
207 | bs->io_limits_enabled = true; | |
208 | } | |
209 | ||
210 | /* This function makes an IO wait if needed | |
211 | * | |
212 | * @nb_sectors: the number of sectors of the IO | |
213 | * @is_write: is the IO a write | |
214 | */ | |
98f90dba | 215 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 216 | unsigned int bytes, |
cc0681c4 | 217 | bool is_write) |
98f90dba | 218 | { |
cc0681c4 BC |
219 | /* does this io must wait */ |
220 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 221 | |
cc0681c4 BC |
222 | /* if must wait or any request of this type throttled queue the IO */ |
223 | if (must_wait || | |
224 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
225 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
226 | } |
227 | ||
cc0681c4 | 228 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
229 | throttle_account(&bs->throttle_state, is_write, bytes); |
230 | ||
98f90dba | 231 | |
cc0681c4 BC |
232 | /* if the next request must wait -> do nothing */ |
233 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
234 | return; | |
98f90dba ZYW |
235 | } |
236 | ||
cc0681c4 BC |
237 | /* else queue next request for execution */ |
238 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
239 | } |
240 | ||
339064d5 KW |
241 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
242 | { | |
243 | if (!bs || !bs->drv) { | |
244 | /* 4k should be on the safe side */ | |
245 | return 4096; | |
246 | } | |
247 | ||
248 | return bs->bl.opt_mem_alignment; | |
249 | } | |
250 | ||
9e0b22f4 | 251 | /* check if the path starts with "<protocol>:" */ |
5c98415b | 252 | int path_has_protocol(const char *path) |
9e0b22f4 | 253 | { |
947995c0 PB |
254 | const char *p; |
255 | ||
9e0b22f4 SH |
256 | #ifdef _WIN32 |
257 | if (is_windows_drive(path) || | |
258 | is_windows_drive_prefix(path)) { | |
259 | return 0; | |
260 | } | |
947995c0 PB |
261 | p = path + strcspn(path, ":/\\"); |
262 | #else | |
263 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
264 | #endif |
265 | ||
947995c0 | 266 | return *p == ':'; |
9e0b22f4 SH |
267 | } |
268 | ||
83f64091 | 269 | int path_is_absolute(const char *path) |
3b0d4f61 | 270 | { |
21664424 FB |
271 | #ifdef _WIN32 |
272 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 273 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 274 | return 1; |
f53f4da9 PB |
275 | } |
276 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 277 | #else |
f53f4da9 | 278 | return (*path == '/'); |
3b9f94e1 | 279 | #endif |
3b0d4f61 FB |
280 | } |
281 | ||
83f64091 FB |
282 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
283 | path to it by considering it is relative to base_path. URL are | |
284 | supported. */ | |
285 | void path_combine(char *dest, int dest_size, | |
286 | const char *base_path, | |
287 | const char *filename) | |
3b0d4f61 | 288 | { |
83f64091 FB |
289 | const char *p, *p1; |
290 | int len; | |
291 | ||
292 | if (dest_size <= 0) | |
293 | return; | |
294 | if (path_is_absolute(filename)) { | |
295 | pstrcpy(dest, dest_size, filename); | |
296 | } else { | |
297 | p = strchr(base_path, ':'); | |
298 | if (p) | |
299 | p++; | |
300 | else | |
301 | p = base_path; | |
3b9f94e1 FB |
302 | p1 = strrchr(base_path, '/'); |
303 | #ifdef _WIN32 | |
304 | { | |
305 | const char *p2; | |
306 | p2 = strrchr(base_path, '\\'); | |
307 | if (!p1 || p2 > p1) | |
308 | p1 = p2; | |
309 | } | |
310 | #endif | |
83f64091 FB |
311 | if (p1) |
312 | p1++; | |
313 | else | |
314 | p1 = base_path; | |
315 | if (p1 > p) | |
316 | p = p1; | |
317 | len = p - base_path; | |
318 | if (len > dest_size - 1) | |
319 | len = dest_size - 1; | |
320 | memcpy(dest, base_path, len); | |
321 | dest[len] = '\0'; | |
322 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 323 | } |
3b0d4f61 FB |
324 | } |
325 | ||
0a82855a HR |
326 | void bdrv_get_full_backing_filename_from_filename(const char *backed, |
327 | const char *backing, | |
9f07429e HR |
328 | char *dest, size_t sz, |
329 | Error **errp) | |
dc5a1371 | 330 | { |
9f07429e HR |
331 | if (backing[0] == '\0' || path_has_protocol(backing) || |
332 | path_is_absolute(backing)) | |
333 | { | |
0a82855a | 334 | pstrcpy(dest, sz, backing); |
9f07429e HR |
335 | } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { |
336 | error_setg(errp, "Cannot use relative backing file names for '%s'", | |
337 | backed); | |
dc5a1371 | 338 | } else { |
0a82855a | 339 | path_combine(dest, sz, backed, backing); |
dc5a1371 PB |
340 | } |
341 | } | |
342 | ||
9f07429e HR |
343 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, |
344 | Error **errp) | |
0a82855a | 345 | { |
9f07429e HR |
346 | char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; |
347 | ||
348 | bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, | |
349 | dest, sz, errp); | |
0a82855a HR |
350 | } |
351 | ||
0eb7217e | 352 | void bdrv_setup_io_funcs(BlockDriver *bdrv) |
ea2384d3 | 353 | { |
8c5873d6 SH |
354 | /* Block drivers without coroutine functions need emulation */ |
355 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
356 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
357 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
358 | ||
f8c35c1d SH |
359 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
360 | * the block driver lacks aio we need to emulate that too. | |
361 | */ | |
f9f05dc5 KW |
362 | if (!bdrv->bdrv_aio_readv) { |
363 | /* add AIO emulation layer */ | |
364 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
365 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 366 | } |
83f64091 | 367 | } |
0eb7217e SH |
368 | } |
369 | ||
370 | void bdrv_register(BlockDriver *bdrv) | |
371 | { | |
372 | bdrv_setup_io_funcs(bdrv); | |
b2e12bc6 | 373 | |
8a22f02a | 374 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 375 | } |
b338082b | 376 | |
7f06d47e | 377 | BlockDriverState *bdrv_new_root(void) |
b338082b | 378 | { |
7f06d47e | 379 | BlockDriverState *bs = bdrv_new(); |
e4e9986b | 380 | |
e4e9986b | 381 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
e4e9986b MA |
382 | return bs; |
383 | } | |
384 | ||
385 | BlockDriverState *bdrv_new(void) | |
386 | { | |
387 | BlockDriverState *bs; | |
388 | int i; | |
389 | ||
5839e53b | 390 | bs = g_new0(BlockDriverState, 1); |
e4654d2d | 391 | QLIST_INIT(&bs->dirty_bitmaps); |
fbe40ff7 FZ |
392 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
393 | QLIST_INIT(&bs->op_blockers[i]); | |
394 | } | |
28a7282a | 395 | bdrv_iostatus_disable(bs); |
d7d512f6 | 396 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 397 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
398 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
399 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 400 | bs->refcnt = 1; |
dcd04228 | 401 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 402 | |
b338082b FB |
403 | return bs; |
404 | } | |
405 | ||
d7d512f6 PB |
406 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
407 | { | |
408 | notifier_list_add(&bs->close_notifiers, notify); | |
409 | } | |
410 | ||
ea2384d3 FB |
411 | BlockDriver *bdrv_find_format(const char *format_name) |
412 | { | |
413 | BlockDriver *drv1; | |
8a22f02a SH |
414 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
415 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 416 | return drv1; |
8a22f02a | 417 | } |
ea2384d3 FB |
418 | } |
419 | return NULL; | |
420 | } | |
421 | ||
b64ec4e4 | 422 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 423 | { |
b64ec4e4 FZ |
424 | static const char *whitelist_rw[] = { |
425 | CONFIG_BDRV_RW_WHITELIST | |
426 | }; | |
427 | static const char *whitelist_ro[] = { | |
428 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
429 | }; |
430 | const char **p; | |
431 | ||
b64ec4e4 | 432 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 433 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 434 | } |
eb852011 | 435 | |
b64ec4e4 | 436 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
437 | if (!strcmp(drv->format_name, *p)) { |
438 | return 1; | |
439 | } | |
440 | } | |
b64ec4e4 FZ |
441 | if (read_only) { |
442 | for (p = whitelist_ro; *p; p++) { | |
443 | if (!strcmp(drv->format_name, *p)) { | |
444 | return 1; | |
445 | } | |
446 | } | |
447 | } | |
eb852011 MA |
448 | return 0; |
449 | } | |
450 | ||
b64ec4e4 FZ |
451 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
452 | bool read_only) | |
eb852011 MA |
453 | { |
454 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 455 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
456 | } |
457 | ||
5b7e1542 ZYW |
458 | typedef struct CreateCo { |
459 | BlockDriver *drv; | |
460 | char *filename; | |
83d0521a | 461 | QemuOpts *opts; |
5b7e1542 | 462 | int ret; |
cc84d90f | 463 | Error *err; |
5b7e1542 ZYW |
464 | } CreateCo; |
465 | ||
466 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
467 | { | |
cc84d90f HR |
468 | Error *local_err = NULL; |
469 | int ret; | |
470 | ||
5b7e1542 ZYW |
471 | CreateCo *cco = opaque; |
472 | assert(cco->drv); | |
473 | ||
c282e1fd | 474 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
84d18f06 | 475 | if (local_err) { |
cc84d90f HR |
476 | error_propagate(&cco->err, local_err); |
477 | } | |
478 | cco->ret = ret; | |
5b7e1542 ZYW |
479 | } |
480 | ||
0e7e1989 | 481 | int bdrv_create(BlockDriver *drv, const char* filename, |
83d0521a | 482 | QemuOpts *opts, Error **errp) |
ea2384d3 | 483 | { |
5b7e1542 ZYW |
484 | int ret; |
485 | ||
486 | Coroutine *co; | |
487 | CreateCo cco = { | |
488 | .drv = drv, | |
489 | .filename = g_strdup(filename), | |
83d0521a | 490 | .opts = opts, |
5b7e1542 | 491 | .ret = NOT_DONE, |
cc84d90f | 492 | .err = NULL, |
5b7e1542 ZYW |
493 | }; |
494 | ||
c282e1fd | 495 | if (!drv->bdrv_create) { |
cc84d90f | 496 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
497 | ret = -ENOTSUP; |
498 | goto out; | |
5b7e1542 ZYW |
499 | } |
500 | ||
501 | if (qemu_in_coroutine()) { | |
502 | /* Fast-path if already in coroutine context */ | |
503 | bdrv_create_co_entry(&cco); | |
504 | } else { | |
505 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
506 | qemu_coroutine_enter(co, &cco); | |
507 | while (cco.ret == NOT_DONE) { | |
b47ec2c4 | 508 | aio_poll(qemu_get_aio_context(), true); |
5b7e1542 ZYW |
509 | } |
510 | } | |
511 | ||
512 | ret = cco.ret; | |
cc84d90f | 513 | if (ret < 0) { |
84d18f06 | 514 | if (cco.err) { |
cc84d90f HR |
515 | error_propagate(errp, cco.err); |
516 | } else { | |
517 | error_setg_errno(errp, -ret, "Could not create image"); | |
518 | } | |
519 | } | |
0e7e1989 | 520 | |
80168bff LC |
521 | out: |
522 | g_free(cco.filename); | |
5b7e1542 | 523 | return ret; |
ea2384d3 FB |
524 | } |
525 | ||
c282e1fd | 526 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
84a12e66 CH |
527 | { |
528 | BlockDriver *drv; | |
cc84d90f HR |
529 | Error *local_err = NULL; |
530 | int ret; | |
84a12e66 | 531 | |
b65a5e12 | 532 | drv = bdrv_find_protocol(filename, true, errp); |
84a12e66 | 533 | if (drv == NULL) { |
16905d71 | 534 | return -ENOENT; |
84a12e66 CH |
535 | } |
536 | ||
c282e1fd | 537 | ret = bdrv_create(drv, filename, opts, &local_err); |
84d18f06 | 538 | if (local_err) { |
cc84d90f HR |
539 | error_propagate(errp, local_err); |
540 | } | |
541 | return ret; | |
84a12e66 CH |
542 | } |
543 | ||
3baca891 | 544 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd KW |
545 | { |
546 | BlockDriver *drv = bs->drv; | |
3baca891 | 547 | Error *local_err = NULL; |
d34682cd KW |
548 | |
549 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
550 | ||
466ad822 | 551 | if (!drv) { |
3baca891 | 552 | return; |
466ad822 KW |
553 | } |
554 | ||
555 | /* Take some limits from the children as a default */ | |
556 | if (bs->file) { | |
3baca891 KW |
557 | bdrv_refresh_limits(bs->file, &local_err); |
558 | if (local_err) { | |
559 | error_propagate(errp, local_err); | |
560 | return; | |
561 | } | |
466ad822 | 562 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
2647fab5 | 563 | bs->bl.max_transfer_length = bs->file->bl.max_transfer_length; |
339064d5 KW |
564 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
565 | } else { | |
566 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
567 | } |
568 | ||
569 | if (bs->backing_hd) { | |
3baca891 KW |
570 | bdrv_refresh_limits(bs->backing_hd, &local_err); |
571 | if (local_err) { | |
572 | error_propagate(errp, local_err); | |
573 | return; | |
574 | } | |
466ad822 KW |
575 | bs->bl.opt_transfer_length = |
576 | MAX(bs->bl.opt_transfer_length, | |
577 | bs->backing_hd->bl.opt_transfer_length); | |
2647fab5 PL |
578 | bs->bl.max_transfer_length = |
579 | MIN_NON_ZERO(bs->bl.max_transfer_length, | |
580 | bs->backing_hd->bl.max_transfer_length); | |
339064d5 KW |
581 | bs->bl.opt_mem_alignment = |
582 | MAX(bs->bl.opt_mem_alignment, | |
583 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
584 | } |
585 | ||
586 | /* Then let the driver override it */ | |
587 | if (drv->bdrv_refresh_limits) { | |
3baca891 | 588 | drv->bdrv_refresh_limits(bs, errp); |
d34682cd | 589 | } |
d34682cd KW |
590 | } |
591 | ||
892b7de8 ET |
592 | /** |
593 | * Try to get @bs's logical and physical block size. | |
594 | * On success, store them in @bsz struct and return 0. | |
595 | * On failure return -errno. | |
596 | * @bs must not be empty. | |
597 | */ | |
598 | int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) | |
599 | { | |
600 | BlockDriver *drv = bs->drv; | |
601 | ||
602 | if (drv && drv->bdrv_probe_blocksizes) { | |
603 | return drv->bdrv_probe_blocksizes(bs, bsz); | |
604 | } | |
605 | ||
606 | return -ENOTSUP; | |
607 | } | |
608 | ||
609 | /** | |
610 | * Try to get @bs's geometry (cyls, heads, sectors). | |
611 | * On success, store them in @geo struct and return 0. | |
612 | * On failure return -errno. | |
613 | * @bs must not be empty. | |
614 | */ | |
615 | int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
616 | { | |
617 | BlockDriver *drv = bs->drv; | |
618 | ||
619 | if (drv && drv->bdrv_probe_geometry) { | |
620 | return drv->bdrv_probe_geometry(bs, geo); | |
621 | } | |
622 | ||
623 | return -ENOTSUP; | |
624 | } | |
625 | ||
eba25057 JM |
626 | /* |
627 | * Create a uniquely-named empty temporary file. | |
628 | * Return 0 upon success, otherwise a negative errno value. | |
629 | */ | |
630 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 631 | { |
eba25057 | 632 | #ifdef _WIN32 |
3b9f94e1 | 633 | char temp_dir[MAX_PATH]; |
eba25057 JM |
634 | /* GetTempFileName requires that its output buffer (4th param) |
635 | have length MAX_PATH or greater. */ | |
636 | assert(size >= MAX_PATH); | |
637 | return (GetTempPath(MAX_PATH, temp_dir) | |
638 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
639 | ? 0 : -GetLastError()); | |
d5249393 | 640 | #else |
67b915a5 | 641 | int fd; |
7ccfb2eb | 642 | const char *tmpdir; |
0badc1ee | 643 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
644 | if (!tmpdir) { |
645 | tmpdir = "/var/tmp"; | |
646 | } | |
eba25057 JM |
647 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
648 | return -EOVERFLOW; | |
649 | } | |
ea2384d3 | 650 | fd = mkstemp(filename); |
fe235a06 DH |
651 | if (fd < 0) { |
652 | return -errno; | |
653 | } | |
654 | if (close(fd) != 0) { | |
655 | unlink(filename); | |
eba25057 JM |
656 | return -errno; |
657 | } | |
658 | return 0; | |
d5249393 | 659 | #endif |
eba25057 | 660 | } |
fc01f7e7 | 661 | |
84a12e66 CH |
662 | /* |
663 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
664 | * recognized as a host CDROM. | |
665 | */ | |
666 | static BlockDriver *find_hdev_driver(const char *filename) | |
667 | { | |
668 | int score_max = 0, score; | |
669 | BlockDriver *drv = NULL, *d; | |
670 | ||
671 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
672 | if (d->bdrv_probe_device) { | |
673 | score = d->bdrv_probe_device(filename); | |
674 | if (score > score_max) { | |
675 | score_max = score; | |
676 | drv = d; | |
677 | } | |
678 | } | |
679 | } | |
680 | ||
681 | return drv; | |
682 | } | |
683 | ||
98289620 | 684 | BlockDriver *bdrv_find_protocol(const char *filename, |
b65a5e12 HR |
685 | bool allow_protocol_prefix, |
686 | Error **errp) | |
83f64091 FB |
687 | { |
688 | BlockDriver *drv1; | |
689 | char protocol[128]; | |
1cec71e3 | 690 | int len; |
83f64091 | 691 | const char *p; |
19cb3738 | 692 | |
66f82cee KW |
693 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
694 | ||
39508e7a CH |
695 | /* |
696 | * XXX(hch): we really should not let host device detection | |
697 | * override an explicit protocol specification, but moving this | |
698 | * later breaks access to device names with colons in them. | |
699 | * Thanks to the brain-dead persistent naming schemes on udev- | |
700 | * based Linux systems those actually are quite common. | |
701 | */ | |
702 | drv1 = find_hdev_driver(filename); | |
703 | if (drv1) { | |
704 | return drv1; | |
705 | } | |
706 | ||
98289620 | 707 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
ef810437 | 708 | return &bdrv_file; |
84a12e66 | 709 | } |
98289620 | 710 | |
9e0b22f4 SH |
711 | p = strchr(filename, ':'); |
712 | assert(p != NULL); | |
1cec71e3 AL |
713 | len = p - filename; |
714 | if (len > sizeof(protocol) - 1) | |
715 | len = sizeof(protocol) - 1; | |
716 | memcpy(protocol, filename, len); | |
717 | protocol[len] = '\0'; | |
8a22f02a | 718 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 719 | if (drv1->protocol_name && |
8a22f02a | 720 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 721 | return drv1; |
8a22f02a | 722 | } |
83f64091 | 723 | } |
b65a5e12 HR |
724 | |
725 | error_setg(errp, "Unknown protocol '%s'", protocol); | |
83f64091 FB |
726 | return NULL; |
727 | } | |
728 | ||
c6684249 MA |
729 | /* |
730 | * Guess image format by probing its contents. | |
731 | * This is not a good idea when your image is raw (CVE-2008-2004), but | |
732 | * we do it anyway for backward compatibility. | |
733 | * | |
734 | * @buf contains the image's first @buf_size bytes. | |
7cddd372 KW |
735 | * @buf_size is the buffer size in bytes (generally BLOCK_PROBE_BUF_SIZE, |
736 | * but can be smaller if the image file is smaller) | |
c6684249 MA |
737 | * @filename is its filename. |
738 | * | |
739 | * For all block drivers, call the bdrv_probe() method to get its | |
740 | * probing score. | |
741 | * Return the first block driver with the highest probing score. | |
742 | */ | |
38f3ef57 KW |
743 | BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, |
744 | const char *filename) | |
c6684249 MA |
745 | { |
746 | int score_max = 0, score; | |
747 | BlockDriver *drv = NULL, *d; | |
748 | ||
749 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
750 | if (d->bdrv_probe) { | |
751 | score = d->bdrv_probe(buf, buf_size, filename); | |
752 | if (score > score_max) { | |
753 | score_max = score; | |
754 | drv = d; | |
755 | } | |
756 | } | |
757 | } | |
758 | ||
759 | return drv; | |
760 | } | |
761 | ||
f500a6d3 | 762 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 763 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 764 | { |
c6684249 | 765 | BlockDriver *drv; |
7cddd372 | 766 | uint8_t buf[BLOCK_PROBE_BUF_SIZE]; |
f500a6d3 | 767 | int ret = 0; |
f8ea0b00 | 768 | |
08a00559 | 769 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 770 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
ef810437 | 771 | *pdrv = &bdrv_raw; |
c98ac35d | 772 | return ret; |
1a396859 | 773 | } |
f8ea0b00 | 774 | |
83f64091 | 775 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 776 | if (ret < 0) { |
34b5d2c6 HR |
777 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
778 | "format"); | |
c98ac35d SW |
779 | *pdrv = NULL; |
780 | return ret; | |
83f64091 FB |
781 | } |
782 | ||
c6684249 | 783 | drv = bdrv_probe_all(buf, ret, filename); |
c98ac35d | 784 | if (!drv) { |
34b5d2c6 HR |
785 | error_setg(errp, "Could not determine image format: No compatible " |
786 | "driver found"); | |
c98ac35d SW |
787 | ret = -ENOENT; |
788 | } | |
789 | *pdrv = drv; | |
790 | return ret; | |
ea2384d3 FB |
791 | } |
792 | ||
51762288 SH |
793 | /** |
794 | * Set the current 'total_sectors' value | |
65a9bb25 | 795 | * Return 0 on success, -errno on error. |
51762288 SH |
796 | */ |
797 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
798 | { | |
799 | BlockDriver *drv = bs->drv; | |
800 | ||
396759ad NB |
801 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
802 | if (bs->sg) | |
803 | return 0; | |
804 | ||
51762288 SH |
805 | /* query actual device if possible, otherwise just trust the hint */ |
806 | if (drv->bdrv_getlength) { | |
807 | int64_t length = drv->bdrv_getlength(bs); | |
808 | if (length < 0) { | |
809 | return length; | |
810 | } | |
7e382003 | 811 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
812 | } |
813 | ||
814 | bs->total_sectors = hint; | |
815 | return 0; | |
816 | } | |
817 | ||
9e8f1835 PB |
818 | /** |
819 | * Set open flags for a given discard mode | |
820 | * | |
821 | * Return 0 on success, -1 if the discard mode was invalid. | |
822 | */ | |
823 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
824 | { | |
825 | *flags &= ~BDRV_O_UNMAP; | |
826 | ||
827 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
828 | /* do nothing */ | |
829 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
830 | *flags |= BDRV_O_UNMAP; | |
831 | } else { | |
832 | return -1; | |
833 | } | |
834 | ||
835 | return 0; | |
836 | } | |
837 | ||
c3993cdc SH |
838 | /** |
839 | * Set open flags for a given cache mode | |
840 | * | |
841 | * Return 0 on success, -1 if the cache mode was invalid. | |
842 | */ | |
843 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
844 | { | |
845 | *flags &= ~BDRV_O_CACHE_MASK; | |
846 | ||
847 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
848 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
849 | } else if (!strcmp(mode, "directsync")) { |
850 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
851 | } else if (!strcmp(mode, "writeback")) { |
852 | *flags |= BDRV_O_CACHE_WB; | |
853 | } else if (!strcmp(mode, "unsafe")) { | |
854 | *flags |= BDRV_O_CACHE_WB; | |
855 | *flags |= BDRV_O_NO_FLUSH; | |
856 | } else if (!strcmp(mode, "writethrough")) { | |
857 | /* this is the default */ | |
858 | } else { | |
859 | return -1; | |
860 | } | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
53fec9d3 SH |
865 | /** |
866 | * The copy-on-read flag is actually a reference count so multiple users may | |
867 | * use the feature without worrying about clobbering its previous state. | |
868 | * Copy-on-read stays enabled until all users have called to disable it. | |
869 | */ | |
870 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
871 | { | |
872 | bs->copy_on_read++; | |
873 | } | |
874 | ||
875 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
876 | { | |
877 | assert(bs->copy_on_read > 0); | |
878 | bs->copy_on_read--; | |
879 | } | |
880 | ||
b1e6fc08 KW |
881 | /* |
882 | * Returns the flags that a temporary snapshot should get, based on the | |
883 | * originally requested flags (the originally requested image will have flags | |
884 | * like a backing file) | |
885 | */ | |
886 | static int bdrv_temp_snapshot_flags(int flags) | |
887 | { | |
888 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; | |
889 | } | |
890 | ||
0b50cc88 KW |
891 | /* |
892 | * Returns the flags that bs->file should get, based on the given flags for | |
893 | * the parent BDS | |
894 | */ | |
895 | static int bdrv_inherited_flags(int flags) | |
896 | { | |
897 | /* Enable protocol handling, disable format probing for bs->file */ | |
898 | flags |= BDRV_O_PROTOCOL; | |
899 | ||
900 | /* Our block drivers take care to send flushes and respect unmap policy, | |
901 | * so we can enable both unconditionally on lower layers. */ | |
902 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; | |
903 | ||
0b50cc88 | 904 | /* Clear flags that only apply to the top layer */ |
5669b44d | 905 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
0b50cc88 KW |
906 | |
907 | return flags; | |
908 | } | |
909 | ||
317fc44e KW |
910 | /* |
911 | * Returns the flags that bs->backing_hd should get, based on the given flags | |
912 | * for the parent BDS | |
913 | */ | |
914 | static int bdrv_backing_flags(int flags) | |
915 | { | |
916 | /* backing files always opened read-only */ | |
917 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); | |
918 | ||
919 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 920 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e KW |
921 | |
922 | return flags; | |
923 | } | |
924 | ||
7b272452 KW |
925 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
926 | { | |
927 | int open_flags = flags | BDRV_O_CACHE_WB; | |
928 | ||
929 | /* | |
930 | * Clear flags that are internal to the block layer before opening the | |
931 | * image. | |
932 | */ | |
20cca275 | 933 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 KW |
934 | |
935 | /* | |
936 | * Snapshots should be writable. | |
937 | */ | |
8bfea15d | 938 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
939 | open_flags |= BDRV_O_RDWR; |
940 | } | |
941 | ||
942 | return open_flags; | |
943 | } | |
944 | ||
636ea370 KW |
945 | static void bdrv_assign_node_name(BlockDriverState *bs, |
946 | const char *node_name, | |
947 | Error **errp) | |
6913c0c2 BC |
948 | { |
949 | if (!node_name) { | |
636ea370 | 950 | return; |
6913c0c2 BC |
951 | } |
952 | ||
9aebf3b8 | 953 | /* Check for empty string or invalid characters */ |
f5bebbbb | 954 | if (!id_wellformed(node_name)) { |
9aebf3b8 | 955 | error_setg(errp, "Invalid node name"); |
636ea370 | 956 | return; |
6913c0c2 BC |
957 | } |
958 | ||
0c5e94ee | 959 | /* takes care of avoiding namespaces collisions */ |
7f06d47e | 960 | if (blk_by_name(node_name)) { |
0c5e94ee BC |
961 | error_setg(errp, "node-name=%s is conflicting with a device id", |
962 | node_name); | |
636ea370 | 963 | return; |
0c5e94ee BC |
964 | } |
965 | ||
6913c0c2 BC |
966 | /* takes care of avoiding duplicates node names */ |
967 | if (bdrv_find_node(node_name)) { | |
968 | error_setg(errp, "Duplicate node name"); | |
636ea370 | 969 | return; |
6913c0c2 BC |
970 | } |
971 | ||
972 | /* copy node name into the bs and insert it into the graph list */ | |
973 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
974 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
6913c0c2 BC |
975 | } |
976 | ||
57915332 KW |
977 | /* |
978 | * Common part for opening disk images and files | |
b6ad491a KW |
979 | * |
980 | * Removes all processed options from *options. | |
57915332 | 981 | */ |
f500a6d3 | 982 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 983 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
984 | { |
985 | int ret, open_flags; | |
035fccdf | 986 | const char *filename; |
6913c0c2 | 987 | const char *node_name = NULL; |
34b5d2c6 | 988 | Error *local_err = NULL; |
57915332 KW |
989 | |
990 | assert(drv != NULL); | |
6405875c | 991 | assert(bs->file == NULL); |
707ff828 | 992 | assert(options != NULL && bs->options != options); |
57915332 | 993 | |
45673671 KW |
994 | if (file != NULL) { |
995 | filename = file->filename; | |
996 | } else { | |
997 | filename = qdict_get_try_str(options, "filename"); | |
998 | } | |
999 | ||
765003db KW |
1000 | if (drv->bdrv_needs_filename && !filename) { |
1001 | error_setg(errp, "The '%s' block driver requires a file name", | |
1002 | drv->format_name); | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | ||
45673671 | 1006 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 1007 | |
6913c0c2 | 1008 | node_name = qdict_get_try_str(options, "node-name"); |
636ea370 | 1009 | bdrv_assign_node_name(bs, node_name, &local_err); |
0fb6395c | 1010 | if (local_err) { |
636ea370 KW |
1011 | error_propagate(errp, local_err); |
1012 | return -EINVAL; | |
6913c0c2 BC |
1013 | } |
1014 | qdict_del(options, "node-name"); | |
1015 | ||
5d186eb0 KW |
1016 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
1017 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
1018 | * and return immediately. */ | |
1019 | if (file != NULL && drv->bdrv_file_open) { | |
1020 | bdrv_swap(file, bs); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
57915332 | 1024 | bs->open_flags = flags; |
1b7fd729 | 1025 | bs->guest_block_size = 512; |
c25f53b0 | 1026 | bs->request_alignment = 512; |
0d51b4de | 1027 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
1028 | open_flags = bdrv_open_flags(bs, flags); |
1029 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
1030 | ||
1031 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
1032 | error_setg(errp, |
1033 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
1034 | ? "Driver '%s' can only be used for read-only devices" | |
1035 | : "Driver '%s' is not whitelisted", | |
1036 | drv->format_name); | |
b64ec4e4 FZ |
1037 | return -ENOTSUP; |
1038 | } | |
57915332 | 1039 | |
53fec9d3 | 1040 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
1041 | if (flags & BDRV_O_COPY_ON_READ) { |
1042 | if (!bs->read_only) { | |
1043 | bdrv_enable_copy_on_read(bs); | |
1044 | } else { | |
1045 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
1046 | return -EINVAL; | |
1047 | } | |
53fec9d3 SH |
1048 | } |
1049 | ||
c2ad1b0c KW |
1050 | if (filename != NULL) { |
1051 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
1052 | } else { | |
1053 | bs->filename[0] = '\0'; | |
1054 | } | |
91af7014 | 1055 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
57915332 | 1056 | |
57915332 | 1057 | bs->drv = drv; |
7267c094 | 1058 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 1059 | |
03f541bd | 1060 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 1061 | |
66f82cee KW |
1062 | /* Open the image, either directly or using a protocol */ |
1063 | if (drv->bdrv_file_open) { | |
5d186eb0 | 1064 | assert(file == NULL); |
030be321 | 1065 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 1066 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 1067 | } else { |
2af5ef70 | 1068 | if (file == NULL) { |
34b5d2c6 HR |
1069 | error_setg(errp, "Can't use '%s' as a block driver for the " |
1070 | "protocol level", drv->format_name); | |
2af5ef70 KW |
1071 | ret = -EINVAL; |
1072 | goto free_and_fail; | |
1073 | } | |
f500a6d3 | 1074 | bs->file = file; |
34b5d2c6 | 1075 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
1076 | } |
1077 | ||
57915332 | 1078 | if (ret < 0) { |
84d18f06 | 1079 | if (local_err) { |
34b5d2c6 | 1080 | error_propagate(errp, local_err); |
2fa9aa59 DH |
1081 | } else if (bs->filename[0]) { |
1082 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
1083 | } else { |
1084 | error_setg_errno(errp, -ret, "Could not open image"); | |
1085 | } | |
57915332 KW |
1086 | goto free_and_fail; |
1087 | } | |
1088 | ||
a1f688f4 MA |
1089 | if (bs->encrypted) { |
1090 | error_report("Encrypted images are deprecated"); | |
1091 | error_printf("Support for them will be removed in a future release.\n" | |
1092 | "You can use 'qemu-img convert' to convert your image" | |
1093 | " to an unencrypted one.\n"); | |
1094 | } | |
1095 | ||
51762288 SH |
1096 | ret = refresh_total_sectors(bs, bs->total_sectors); |
1097 | if (ret < 0) { | |
34b5d2c6 | 1098 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 1099 | goto free_and_fail; |
57915332 | 1100 | } |
51762288 | 1101 | |
3baca891 KW |
1102 | bdrv_refresh_limits(bs, &local_err); |
1103 | if (local_err) { | |
1104 | error_propagate(errp, local_err); | |
1105 | ret = -EINVAL; | |
1106 | goto free_and_fail; | |
1107 | } | |
1108 | ||
c25f53b0 | 1109 | assert(bdrv_opt_mem_align(bs) != 0); |
47ea2de2 | 1110 | assert((bs->request_alignment != 0) || bs->sg); |
57915332 KW |
1111 | return 0; |
1112 | ||
1113 | free_and_fail: | |
f500a6d3 | 1114 | bs->file = NULL; |
7267c094 | 1115 | g_free(bs->opaque); |
57915332 KW |
1116 | bs->opaque = NULL; |
1117 | bs->drv = NULL; | |
1118 | return ret; | |
1119 | } | |
1120 | ||
5e5c4f63 KW |
1121 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1122 | { | |
1123 | QObject *options_obj; | |
1124 | QDict *options; | |
1125 | int ret; | |
1126 | ||
1127 | ret = strstart(filename, "json:", &filename); | |
1128 | assert(ret); | |
1129 | ||
1130 | options_obj = qobject_from_json(filename); | |
1131 | if (!options_obj) { | |
1132 | error_setg(errp, "Could not parse the JSON options"); | |
1133 | return NULL; | |
1134 | } | |
1135 | ||
1136 | if (qobject_type(options_obj) != QTYPE_QDICT) { | |
1137 | qobject_decref(options_obj); | |
1138 | error_setg(errp, "Invalid JSON object given"); | |
1139 | return NULL; | |
1140 | } | |
1141 | ||
1142 | options = qobject_to_qdict(options_obj); | |
1143 | qdict_flatten(options); | |
1144 | ||
1145 | return options; | |
1146 | } | |
1147 | ||
b6ce07aa | 1148 | /* |
f54120ff KW |
1149 | * Fills in default options for opening images and converts the legacy |
1150 | * filename/flags pair to option QDict entries. | |
b6ce07aa | 1151 | */ |
5e5c4f63 | 1152 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
17b005f1 | 1153 | BlockDriver *drv, Error **errp) |
ea2384d3 | 1154 | { |
5e5c4f63 | 1155 | const char *filename = *pfilename; |
c2ad1b0c | 1156 | const char *drvname; |
462f5bcf | 1157 | bool protocol = flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 1158 | bool parse_filename = false; |
34b5d2c6 | 1159 | Error *local_err = NULL; |
83f64091 | 1160 | |
5e5c4f63 KW |
1161 | /* Parse json: pseudo-protocol */ |
1162 | if (filename && g_str_has_prefix(filename, "json:")) { | |
1163 | QDict *json_options = parse_json_filename(filename, &local_err); | |
1164 | if (local_err) { | |
1165 | error_propagate(errp, local_err); | |
1166 | return -EINVAL; | |
1167 | } | |
1168 | ||
1169 | /* Options given in the filename have lower priority than options | |
1170 | * specified directly */ | |
1171 | qdict_join(*options, json_options, false); | |
1172 | QDECREF(json_options); | |
1173 | *pfilename = filename = NULL; | |
1174 | } | |
1175 | ||
035fccdf | 1176 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 1177 | if (protocol && filename) { |
f54120ff KW |
1178 | if (!qdict_haskey(*options, "filename")) { |
1179 | qdict_put(*options, "filename", qstring_from_str(filename)); | |
1180 | parse_filename = true; | |
1181 | } else { | |
1182 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
1183 | "the same time"); | |
1184 | return -EINVAL; | |
1185 | } | |
035fccdf KW |
1186 | } |
1187 | ||
c2ad1b0c | 1188 | /* Find the right block driver */ |
f54120ff | 1189 | filename = qdict_get_try_str(*options, "filename"); |
5acd9d81 | 1190 | drvname = qdict_get_try_str(*options, "driver"); |
f54120ff | 1191 | |
17b005f1 KW |
1192 | if (drv) { |
1193 | if (drvname) { | |
1194 | error_setg(errp, "Driver specified twice"); | |
1195 | return -EINVAL; | |
1196 | } | |
1197 | drvname = drv->format_name; | |
1198 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1199 | } else { | |
1200 | if (!drvname && protocol) { | |
1201 | if (filename) { | |
b65a5e12 | 1202 | drv = bdrv_find_protocol(filename, parse_filename, errp); |
17b005f1 | 1203 | if (!drv) { |
17b005f1 KW |
1204 | return -EINVAL; |
1205 | } | |
1206 | ||
1207 | drvname = drv->format_name; | |
1208 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1209 | } else { | |
1210 | error_setg(errp, "Must specify either driver or file"); | |
f54120ff KW |
1211 | return -EINVAL; |
1212 | } | |
17b005f1 KW |
1213 | } else if (drvname) { |
1214 | drv = bdrv_find_format(drvname); | |
1215 | if (!drv) { | |
1216 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1217 | return -ENOENT; | |
1218 | } | |
98289620 | 1219 | } |
c2ad1b0c KW |
1220 | } |
1221 | ||
17b005f1 | 1222 | assert(drv || !protocol); |
c2ad1b0c | 1223 | |
f54120ff | 1224 | /* Driver-specific filename parsing */ |
17b005f1 | 1225 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1226 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1227 | if (local_err) { |
34b5d2c6 | 1228 | error_propagate(errp, local_err); |
f54120ff | 1229 | return -EINVAL; |
6963a30d | 1230 | } |
cd5d031e HR |
1231 | |
1232 | if (!drv->bdrv_needs_filename) { | |
1233 | qdict_del(*options, "filename"); | |
cd5d031e | 1234 | } |
6963a30d KW |
1235 | } |
1236 | ||
f54120ff KW |
1237 | return 0; |
1238 | } | |
1239 | ||
8d24cce1 FZ |
1240 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
1241 | { | |
1242 | ||
826b6ca0 FZ |
1243 | if (bs->backing_hd) { |
1244 | assert(bs->backing_blocker); | |
1245 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); | |
1246 | } else if (backing_hd) { | |
1247 | error_setg(&bs->backing_blocker, | |
81e5f78a AG |
1248 | "node is used as backing hd of '%s'", |
1249 | bdrv_get_device_or_node_name(bs)); | |
826b6ca0 FZ |
1250 | } |
1251 | ||
8d24cce1 FZ |
1252 | bs->backing_hd = backing_hd; |
1253 | if (!backing_hd) { | |
826b6ca0 FZ |
1254 | error_free(bs->backing_blocker); |
1255 | bs->backing_blocker = NULL; | |
8d24cce1 FZ |
1256 | goto out; |
1257 | } | |
1258 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
1259 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); | |
1260 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), | |
1261 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
826b6ca0 FZ |
1262 | |
1263 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); | |
1264 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ | |
bb00021d | 1265 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, |
826b6ca0 | 1266 | bs->backing_blocker); |
8d24cce1 | 1267 | out: |
3baca891 | 1268 | bdrv_refresh_limits(bs, NULL); |
8d24cce1 FZ |
1269 | } |
1270 | ||
31ca6d07 KW |
1271 | /* |
1272 | * Opens the backing file for a BlockDriverState if not yet open | |
1273 | * | |
1274 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1275 | * empty set of options. The reference to the QDict is transferred to this | |
1276 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1277 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1278 | */ | |
34b5d2c6 | 1279 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 | 1280 | { |
1ba4b6a5 | 1281 | char *backing_filename = g_malloc0(PATH_MAX); |
317fc44e | 1282 | int ret = 0; |
8d24cce1 | 1283 | BlockDriverState *backing_hd; |
34b5d2c6 | 1284 | Error *local_err = NULL; |
9156df12 PB |
1285 | |
1286 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1287 | QDECREF(options); |
1ba4b6a5 | 1288 | goto free_exit; |
9156df12 PB |
1289 | } |
1290 | ||
31ca6d07 KW |
1291 | /* NULL means an empty set of options */ |
1292 | if (options == NULL) { | |
1293 | options = qdict_new(); | |
1294 | } | |
1295 | ||
9156df12 | 1296 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1297 | if (qdict_haskey(options, "file.filename")) { |
1298 | backing_filename[0] = '\0'; | |
1299 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1300 | QDECREF(options); |
1ba4b6a5 | 1301 | goto free_exit; |
dbecebdd | 1302 | } else { |
9f07429e HR |
1303 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX, |
1304 | &local_err); | |
1305 | if (local_err) { | |
1306 | ret = -EINVAL; | |
1307 | error_propagate(errp, local_err); | |
1308 | QDECREF(options); | |
1309 | goto free_exit; | |
1310 | } | |
9156df12 PB |
1311 | } |
1312 | ||
8ee79e70 KW |
1313 | if (!bs->drv || !bs->drv->supports_backing) { |
1314 | ret = -EINVAL; | |
1315 | error_setg(errp, "Driver doesn't support backing files"); | |
1316 | QDECREF(options); | |
1317 | goto free_exit; | |
1318 | } | |
1319 | ||
e4e9986b | 1320 | backing_hd = bdrv_new(); |
8d24cce1 | 1321 | |
c5f6e493 KW |
1322 | if (bs->backing_format[0] != '\0' && !qdict_haskey(options, "driver")) { |
1323 | qdict_put(options, "driver", qstring_from_str(bs->backing_format)); | |
9156df12 PB |
1324 | } |
1325 | ||
f67503e5 | 1326 | assert(bs->backing_hd == NULL); |
8d24cce1 | 1327 | ret = bdrv_open(&backing_hd, |
ddf5636d | 1328 | *backing_filename ? backing_filename : NULL, NULL, options, |
c5f6e493 | 1329 | bdrv_backing_flags(bs->open_flags), NULL, &local_err); |
9156df12 | 1330 | if (ret < 0) { |
8d24cce1 FZ |
1331 | bdrv_unref(backing_hd); |
1332 | backing_hd = NULL; | |
9156df12 | 1333 | bs->open_flags |= BDRV_O_NO_BACKING; |
b04b6b6e FZ |
1334 | error_setg(errp, "Could not open backing file: %s", |
1335 | error_get_pretty(local_err)); | |
1336 | error_free(local_err); | |
1ba4b6a5 | 1337 | goto free_exit; |
9156df12 | 1338 | } |
8d24cce1 | 1339 | bdrv_set_backing_hd(bs, backing_hd); |
d80ac658 | 1340 | |
1ba4b6a5 BC |
1341 | free_exit: |
1342 | g_free(backing_filename); | |
1343 | return ret; | |
9156df12 PB |
1344 | } |
1345 | ||
da557aac HR |
1346 | /* |
1347 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1348 | * device's options. | |
1349 | * | |
da557aac HR |
1350 | * If allow_none is true, no image will be opened if filename is false and no |
1351 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1352 | * | |
1353 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1354 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1355 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1356 | * BlockdevRef. | |
1357 | * | |
1358 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1359 | * |
1360 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1361 | */ |
1362 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1363 | QDict *options, const char *bdref_key, int flags, | |
f7d9fd8c | 1364 | bool allow_none, Error **errp) |
da557aac HR |
1365 | { |
1366 | QDict *image_options; | |
1367 | int ret; | |
1368 | char *bdref_key_dot; | |
1369 | const char *reference; | |
1370 | ||
f67503e5 HR |
1371 | assert(pbs); |
1372 | assert(*pbs == NULL); | |
1373 | ||
da557aac HR |
1374 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1375 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1376 | g_free(bdref_key_dot); | |
1377 | ||
1378 | reference = qdict_get_try_str(options, bdref_key); | |
1379 | if (!filename && !reference && !qdict_size(image_options)) { | |
1380 | if (allow_none) { | |
1381 | ret = 0; | |
1382 | } else { | |
1383 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1384 | bdref_key); | |
1385 | ret = -EINVAL; | |
1386 | } | |
b20e61e0 | 1387 | QDECREF(image_options); |
da557aac HR |
1388 | goto done; |
1389 | } | |
1390 | ||
f7d9fd8c | 1391 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
da557aac HR |
1392 | |
1393 | done: | |
1394 | qdict_del(options, bdref_key); | |
1395 | return ret; | |
1396 | } | |
1397 | ||
6b8aeca5 | 1398 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
b998875d KW |
1399 | { |
1400 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 1401 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d | 1402 | int64_t total_size; |
83d0521a | 1403 | QemuOpts *opts = NULL; |
b998875d KW |
1404 | QDict *snapshot_options; |
1405 | BlockDriverState *bs_snapshot; | |
1406 | Error *local_err; | |
1407 | int ret; | |
1408 | ||
1409 | /* if snapshot, we create a temporary backing file and open it | |
1410 | instead of opening 'filename' directly */ | |
1411 | ||
1412 | /* Get the required size from the image */ | |
f187743a KW |
1413 | total_size = bdrv_getlength(bs); |
1414 | if (total_size < 0) { | |
6b8aeca5 | 1415 | ret = total_size; |
f187743a | 1416 | error_setg_errno(errp, -total_size, "Could not get image size"); |
1ba4b6a5 | 1417 | goto out; |
f187743a | 1418 | } |
b998875d KW |
1419 | |
1420 | /* Create the temporary image */ | |
1ba4b6a5 | 1421 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
1422 | if (ret < 0) { |
1423 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 1424 | goto out; |
b998875d KW |
1425 | } |
1426 | ||
ef810437 | 1427 | opts = qemu_opts_create(bdrv_qcow2.create_opts, NULL, 0, |
c282e1fd | 1428 | &error_abort); |
39101f25 | 1429 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size, &error_abort); |
ef810437 | 1430 | ret = bdrv_create(&bdrv_qcow2, tmp_filename, opts, &local_err); |
83d0521a | 1431 | qemu_opts_del(opts); |
b998875d KW |
1432 | if (ret < 0) { |
1433 | error_setg_errno(errp, -ret, "Could not create temporary overlay " | |
1434 | "'%s': %s", tmp_filename, | |
1435 | error_get_pretty(local_err)); | |
1436 | error_free(local_err); | |
1ba4b6a5 | 1437 | goto out; |
b998875d KW |
1438 | } |
1439 | ||
1440 | /* Prepare a new options QDict for the temporary file */ | |
1441 | snapshot_options = qdict_new(); | |
1442 | qdict_put(snapshot_options, "file.driver", | |
1443 | qstring_from_str("file")); | |
1444 | qdict_put(snapshot_options, "file.filename", | |
1445 | qstring_from_str(tmp_filename)); | |
1446 | ||
e4e9986b | 1447 | bs_snapshot = bdrv_new(); |
b998875d KW |
1448 | |
1449 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, | |
ef810437 | 1450 | flags, &bdrv_qcow2, &local_err); |
b998875d KW |
1451 | if (ret < 0) { |
1452 | error_propagate(errp, local_err); | |
1ba4b6a5 | 1453 | goto out; |
b998875d KW |
1454 | } |
1455 | ||
1456 | bdrv_append(bs_snapshot, bs); | |
1ba4b6a5 BC |
1457 | |
1458 | out: | |
1459 | g_free(tmp_filename); | |
6b8aeca5 | 1460 | return ret; |
b998875d KW |
1461 | } |
1462 | ||
b6ce07aa KW |
1463 | /* |
1464 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1465 | * |
1466 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1467 | * empty set of options. The reference to the QDict belongs to the block layer | |
1468 | * after the call (even on failure), so if the caller intends to reuse the | |
1469 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1470 | * |
1471 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1472 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1473 | * |
1474 | * The reference parameter may be used to specify an existing block device which | |
1475 | * should be opened. If specified, neither options nor a filename may be given, | |
1476 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1477 | */ |
ddf5636d HR |
1478 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1479 | const char *reference, QDict *options, int flags, | |
1480 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1481 | { |
b6ce07aa | 1482 | int ret; |
f67503e5 | 1483 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1484 | const char *drvname; |
34b5d2c6 | 1485 | Error *local_err = NULL; |
b1e6fc08 | 1486 | int snapshot_flags = 0; |
712e7874 | 1487 | |
f67503e5 HR |
1488 | assert(pbs); |
1489 | ||
ddf5636d HR |
1490 | if (reference) { |
1491 | bool options_non_empty = options ? qdict_size(options) : false; | |
1492 | QDECREF(options); | |
1493 | ||
1494 | if (*pbs) { | |
1495 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1496 | "another block device"); | |
1497 | return -EINVAL; | |
1498 | } | |
1499 | ||
1500 | if (filename || options_non_empty) { | |
1501 | error_setg(errp, "Cannot reference an existing block device with " | |
1502 | "additional options or a new filename"); | |
1503 | return -EINVAL; | |
1504 | } | |
1505 | ||
1506 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1507 | if (!bs) { | |
1508 | return -ENODEV; | |
1509 | } | |
1510 | bdrv_ref(bs); | |
1511 | *pbs = bs; | |
1512 | return 0; | |
1513 | } | |
1514 | ||
f67503e5 HR |
1515 | if (*pbs) { |
1516 | bs = *pbs; | |
1517 | } else { | |
e4e9986b | 1518 | bs = bdrv_new(); |
f67503e5 HR |
1519 | } |
1520 | ||
de9c0cec KW |
1521 | /* NULL means an empty set of options */ |
1522 | if (options == NULL) { | |
1523 | options = qdict_new(); | |
1524 | } | |
1525 | ||
17b005f1 | 1526 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
462f5bcf KW |
1527 | if (local_err) { |
1528 | goto fail; | |
1529 | } | |
1530 | ||
76c591b0 KW |
1531 | /* Find the right image format driver */ |
1532 | drv = NULL; | |
1533 | drvname = qdict_get_try_str(options, "driver"); | |
1534 | if (drvname) { | |
1535 | drv = bdrv_find_format(drvname); | |
1536 | qdict_del(options, "driver"); | |
1537 | if (!drv) { | |
1538 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
1539 | ret = -EINVAL; | |
1540 | goto fail; | |
1541 | } | |
1542 | } | |
1543 | ||
1544 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
1545 | if (drv && !drv->bdrv_file_open) { | |
1546 | /* If the user explicitly wants a format driver here, we'll need to add | |
1547 | * another layer for the protocol in bs->file */ | |
1548 | flags &= ~BDRV_O_PROTOCOL; | |
1549 | } | |
1550 | ||
de9c0cec | 1551 | bs->options = options; |
b6ad491a | 1552 | options = qdict_clone_shallow(options); |
de9c0cec | 1553 | |
f500a6d3 | 1554 | /* Open image file without format layer */ |
f4788adc KW |
1555 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
1556 | if (flags & BDRV_O_RDWR) { | |
1557 | flags |= BDRV_O_ALLOW_RDWR; | |
1558 | } | |
1559 | if (flags & BDRV_O_SNAPSHOT) { | |
1560 | snapshot_flags = bdrv_temp_snapshot_flags(flags); | |
1561 | flags = bdrv_backing_flags(flags); | |
1562 | } | |
f500a6d3 | 1563 | |
f4788adc KW |
1564 | assert(file == NULL); |
1565 | ret = bdrv_open_image(&file, filename, options, "file", | |
1566 | bdrv_inherited_flags(flags), | |
1567 | true, &local_err); | |
1568 | if (ret < 0) { | |
1569 | goto fail; | |
1570 | } | |
f500a6d3 KW |
1571 | } |
1572 | ||
76c591b0 | 1573 | /* Image format probing */ |
38f3ef57 | 1574 | bs->probed = !drv; |
76c591b0 | 1575 | if (!drv && file) { |
17b005f1 KW |
1576 | ret = find_image_format(file, filename, &drv, &local_err); |
1577 | if (ret < 0) { | |
8bfea15d | 1578 | goto fail; |
2a05cbe4 | 1579 | } |
76c591b0 | 1580 | } else if (!drv) { |
17b005f1 KW |
1581 | error_setg(errp, "Must specify either driver or file"); |
1582 | ret = -EINVAL; | |
8bfea15d | 1583 | goto fail; |
ea2384d3 | 1584 | } |
b6ce07aa KW |
1585 | |
1586 | /* Open the image */ | |
34b5d2c6 | 1587 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1588 | if (ret < 0) { |
8bfea15d | 1589 | goto fail; |
6987307c CH |
1590 | } |
1591 | ||
2a05cbe4 | 1592 | if (file && (bs->file != file)) { |
4f6fd349 | 1593 | bdrv_unref(file); |
f500a6d3 KW |
1594 | file = NULL; |
1595 | } | |
1596 | ||
b6ce07aa | 1597 | /* If there is a backing file, use it */ |
9156df12 | 1598 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1599 | QDict *backing_options; |
1600 | ||
5726d872 | 1601 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1602 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1603 | if (ret < 0) { |
b6ad491a | 1604 | goto close_and_fail; |
b6ce07aa | 1605 | } |
b6ce07aa KW |
1606 | } |
1607 | ||
91af7014 HR |
1608 | bdrv_refresh_filename(bs); |
1609 | ||
b998875d KW |
1610 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
1611 | * temporary snapshot afterwards. */ | |
b1e6fc08 | 1612 | if (snapshot_flags) { |
6b8aeca5 | 1613 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
b998875d | 1614 | if (local_err) { |
b998875d KW |
1615 | goto close_and_fail; |
1616 | } | |
1617 | } | |
1618 | ||
b6ad491a | 1619 | /* Check if any unknown options were used */ |
5acd9d81 | 1620 | if (options && (qdict_size(options) != 0)) { |
b6ad491a | 1621 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
1622 | if (flags & BDRV_O_PROTOCOL) { |
1623 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
1624 | "'%s'", drv->format_name, entry->key); | |
1625 | } else { | |
1626 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " | |
1627 | "support the option '%s'", drv->format_name, | |
bfb197e0 | 1628 | bdrv_get_device_name(bs), entry->key); |
5acd9d81 | 1629 | } |
b6ad491a KW |
1630 | |
1631 | ret = -EINVAL; | |
1632 | goto close_and_fail; | |
1633 | } | |
b6ad491a | 1634 | |
b6ce07aa | 1635 | if (!bdrv_key_required(bs)) { |
a7f53e26 MA |
1636 | if (bs->blk) { |
1637 | blk_dev_change_media_cb(bs->blk, true); | |
1638 | } | |
c3adb58f MA |
1639 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
1640 | && !runstate_check(RUN_STATE_INMIGRATE) | |
1641 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ | |
1642 | error_setg(errp, | |
1643 | "Guest must be stopped for opening of encrypted image"); | |
1644 | ret = -EBUSY; | |
1645 | goto close_and_fail; | |
b6ce07aa KW |
1646 | } |
1647 | ||
c3adb58f | 1648 | QDECREF(options); |
f67503e5 | 1649 | *pbs = bs; |
b6ce07aa KW |
1650 | return 0; |
1651 | ||
8bfea15d | 1652 | fail: |
f500a6d3 | 1653 | if (file != NULL) { |
4f6fd349 | 1654 | bdrv_unref(file); |
f500a6d3 | 1655 | } |
de9c0cec | 1656 | QDECREF(bs->options); |
b6ad491a | 1657 | QDECREF(options); |
de9c0cec | 1658 | bs->options = NULL; |
f67503e5 HR |
1659 | if (!*pbs) { |
1660 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1661 | needs to be freed now. Otherwise, it does not need to be closed, | |
1662 | since it has not really been opened yet. */ | |
1663 | bdrv_unref(bs); | |
1664 | } | |
84d18f06 | 1665 | if (local_err) { |
34b5d2c6 HR |
1666 | error_propagate(errp, local_err); |
1667 | } | |
b6ad491a | 1668 | return ret; |
de9c0cec | 1669 | |
b6ad491a | 1670 | close_and_fail: |
f67503e5 HR |
1671 | /* See fail path, but now the BDS has to be always closed */ |
1672 | if (*pbs) { | |
1673 | bdrv_close(bs); | |
1674 | } else { | |
1675 | bdrv_unref(bs); | |
1676 | } | |
b6ad491a | 1677 | QDECREF(options); |
84d18f06 | 1678 | if (local_err) { |
34b5d2c6 HR |
1679 | error_propagate(errp, local_err); |
1680 | } | |
b6ce07aa KW |
1681 | return ret; |
1682 | } | |
1683 | ||
e971aa12 JC |
1684 | typedef struct BlockReopenQueueEntry { |
1685 | bool prepared; | |
1686 | BDRVReopenState state; | |
1687 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1688 | } BlockReopenQueueEntry; | |
1689 | ||
1690 | /* | |
1691 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1692 | * reopen of multiple devices. | |
1693 | * | |
1694 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1695 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1696 | * be created and initialized. This newly created BlockReopenQueue should be | |
1697 | * passed back in for subsequent calls that are intended to be of the same | |
1698 | * atomic 'set'. | |
1699 | * | |
1700 | * bs is the BlockDriverState to add to the reopen queue. | |
1701 | * | |
1702 | * flags contains the open flags for the associated bs | |
1703 | * | |
1704 | * returns a pointer to bs_queue, which is either the newly allocated | |
1705 | * bs_queue, or the existing bs_queue being used. | |
1706 | * | |
1707 | */ | |
1708 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1709 | BlockDriverState *bs, int flags) | |
1710 | { | |
1711 | assert(bs != NULL); | |
1712 | ||
1713 | BlockReopenQueueEntry *bs_entry; | |
1714 | if (bs_queue == NULL) { | |
1715 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1716 | QSIMPLEQ_INIT(bs_queue); | |
1717 | } | |
1718 | ||
f1f25a2e KW |
1719 | /* bdrv_open() masks this flag out */ |
1720 | flags &= ~BDRV_O_PROTOCOL; | |
1721 | ||
e971aa12 | 1722 | if (bs->file) { |
f1f25a2e | 1723 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
e971aa12 JC |
1724 | } |
1725 | ||
1726 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1727 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1728 | ||
1729 | bs_entry->state.bs = bs; | |
1730 | bs_entry->state.flags = flags; | |
1731 | ||
1732 | return bs_queue; | |
1733 | } | |
1734 | ||
1735 | /* | |
1736 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1737 | * | |
1738 | * The queue passed in (bs_queue) must have been built up previous | |
1739 | * via bdrv_reopen_queue(). | |
1740 | * | |
1741 | * Reopens all BDS specified in the queue, with the appropriate | |
1742 | * flags. All devices are prepared for reopen, and failure of any | |
1743 | * device will cause all device changes to be abandonded, and intermediate | |
1744 | * data cleaned up. | |
1745 | * | |
1746 | * If all devices prepare successfully, then the changes are committed | |
1747 | * to all devices. | |
1748 | * | |
1749 | */ | |
1750 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1751 | { | |
1752 | int ret = -1; | |
1753 | BlockReopenQueueEntry *bs_entry, *next; | |
1754 | Error *local_err = NULL; | |
1755 | ||
1756 | assert(bs_queue != NULL); | |
1757 | ||
1758 | bdrv_drain_all(); | |
1759 | ||
1760 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1761 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1762 | error_propagate(errp, local_err); | |
1763 | goto cleanup; | |
1764 | } | |
1765 | bs_entry->prepared = true; | |
1766 | } | |
1767 | ||
1768 | /* If we reach this point, we have success and just need to apply the | |
1769 | * changes | |
1770 | */ | |
1771 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1772 | bdrv_reopen_commit(&bs_entry->state); | |
1773 | } | |
1774 | ||
1775 | ret = 0; | |
1776 | ||
1777 | cleanup: | |
1778 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1779 | if (ret && bs_entry->prepared) { | |
1780 | bdrv_reopen_abort(&bs_entry->state); | |
1781 | } | |
1782 | g_free(bs_entry); | |
1783 | } | |
1784 | g_free(bs_queue); | |
1785 | return ret; | |
1786 | } | |
1787 | ||
1788 | ||
1789 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1790 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1791 | { | |
1792 | int ret = -1; | |
1793 | Error *local_err = NULL; | |
1794 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1795 | ||
1796 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1797 | if (local_err != NULL) { | |
1798 | error_propagate(errp, local_err); | |
1799 | } | |
1800 | return ret; | |
1801 | } | |
1802 | ||
1803 | ||
1804 | /* | |
1805 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1806 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1807 | * the block driver layer .bdrv_reopen_prepare() | |
1808 | * | |
1809 | * bs is the BlockDriverState to reopen | |
1810 | * flags are the new open flags | |
1811 | * queue is the reopen queue | |
1812 | * | |
1813 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1814 | * as well. | |
1815 | * | |
1816 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1817 | * It is the responsibility of the caller to then call the abort() or | |
1818 | * commit() for any other BDS that have been left in a prepare() state | |
1819 | * | |
1820 | */ | |
1821 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1822 | Error **errp) | |
1823 | { | |
1824 | int ret = -1; | |
1825 | Error *local_err = NULL; | |
1826 | BlockDriver *drv; | |
1827 | ||
1828 | assert(reopen_state != NULL); | |
1829 | assert(reopen_state->bs->drv != NULL); | |
1830 | drv = reopen_state->bs->drv; | |
1831 | ||
1832 | /* if we are to stay read-only, do not allow permission change | |
1833 | * to r/w */ | |
1834 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1835 | reopen_state->flags & BDRV_O_RDWR) { | |
81e5f78a AG |
1836 | error_setg(errp, "Node '%s' is read only", |
1837 | bdrv_get_device_or_node_name(reopen_state->bs)); | |
e971aa12 JC |
1838 | goto error; |
1839 | } | |
1840 | ||
1841 | ||
1842 | ret = bdrv_flush(reopen_state->bs); | |
1843 | if (ret) { | |
1844 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1845 | strerror(-ret)); | |
1846 | goto error; | |
1847 | } | |
1848 | ||
1849 | if (drv->bdrv_reopen_prepare) { | |
1850 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1851 | if (ret) { | |
1852 | if (local_err != NULL) { | |
1853 | error_propagate(errp, local_err); | |
1854 | } else { | |
d8b6895f LC |
1855 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1856 | reopen_state->bs->filename); | |
e971aa12 JC |
1857 | } |
1858 | goto error; | |
1859 | } | |
1860 | } else { | |
1861 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1862 | * handler for each supported drv. */ | |
81e5f78a AG |
1863 | error_setg(errp, "Block format '%s' used by node '%s' " |
1864 | "does not support reopening files", drv->format_name, | |
1865 | bdrv_get_device_or_node_name(reopen_state->bs)); | |
e971aa12 JC |
1866 | ret = -1; |
1867 | goto error; | |
1868 | } | |
1869 | ||
1870 | ret = 0; | |
1871 | ||
1872 | error: | |
1873 | return ret; | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1878 | * makes them final by swapping the staging BlockDriverState contents into | |
1879 | * the active BlockDriverState contents. | |
1880 | */ | |
1881 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1882 | { | |
1883 | BlockDriver *drv; | |
1884 | ||
1885 | assert(reopen_state != NULL); | |
1886 | drv = reopen_state->bs->drv; | |
1887 | assert(drv != NULL); | |
1888 | ||
1889 | /* If there are any driver level actions to take */ | |
1890 | if (drv->bdrv_reopen_commit) { | |
1891 | drv->bdrv_reopen_commit(reopen_state); | |
1892 | } | |
1893 | ||
1894 | /* set BDS specific flags now */ | |
1895 | reopen_state->bs->open_flags = reopen_state->flags; | |
1896 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1897 | BDRV_O_CACHE_WB); | |
1898 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac | 1899 | |
3baca891 | 1900 | bdrv_refresh_limits(reopen_state->bs, NULL); |
e971aa12 JC |
1901 | } |
1902 | ||
1903 | /* | |
1904 | * Abort the reopen, and delete and free the staged changes in | |
1905 | * reopen_state | |
1906 | */ | |
1907 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1908 | { | |
1909 | BlockDriver *drv; | |
1910 | ||
1911 | assert(reopen_state != NULL); | |
1912 | drv = reopen_state->bs->drv; | |
1913 | assert(drv != NULL); | |
1914 | ||
1915 | if (drv->bdrv_reopen_abort) { | |
1916 | drv->bdrv_reopen_abort(reopen_state); | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | ||
fc01f7e7 FB |
1921 | void bdrv_close(BlockDriverState *bs) |
1922 | { | |
33384421 HR |
1923 | BdrvAioNotifier *ban, *ban_next; |
1924 | ||
3cbc002c PB |
1925 | if (bs->job) { |
1926 | block_job_cancel_sync(bs->job); | |
1927 | } | |
58fda173 SH |
1928 | bdrv_drain_all(); /* complete I/O */ |
1929 | bdrv_flush(bs); | |
1930 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1931 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1932 | |
3cbc002c | 1933 | if (bs->drv) { |
557df6ac | 1934 | if (bs->backing_hd) { |
826b6ca0 FZ |
1935 | BlockDriverState *backing_hd = bs->backing_hd; |
1936 | bdrv_set_backing_hd(bs, NULL); | |
1937 | bdrv_unref(backing_hd); | |
557df6ac | 1938 | } |
ea2384d3 | 1939 | bs->drv->bdrv_close(bs); |
7267c094 | 1940 | g_free(bs->opaque); |
ea2384d3 FB |
1941 | bs->opaque = NULL; |
1942 | bs->drv = NULL; | |
53fec9d3 | 1943 | bs->copy_on_read = 0; |
a275fa42 PB |
1944 | bs->backing_file[0] = '\0'; |
1945 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1946 | bs->total_sectors = 0; |
1947 | bs->encrypted = 0; | |
1948 | bs->valid_key = 0; | |
1949 | bs->sg = 0; | |
0d51b4de | 1950 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1951 | QDECREF(bs->options); |
1952 | bs->options = NULL; | |
91af7014 HR |
1953 | QDECREF(bs->full_open_options); |
1954 | bs->full_open_options = NULL; | |
b338082b | 1955 | |
66f82cee | 1956 | if (bs->file != NULL) { |
4f6fd349 | 1957 | bdrv_unref(bs->file); |
0ac9377d | 1958 | bs->file = NULL; |
66f82cee | 1959 | } |
b338082b | 1960 | } |
98f90dba | 1961 | |
a7f53e26 MA |
1962 | if (bs->blk) { |
1963 | blk_dev_change_media_cb(bs->blk, false); | |
1964 | } | |
9ca11154 | 1965 | |
98f90dba ZYW |
1966 | /*throttling disk I/O limits*/ |
1967 | if (bs->io_limits_enabled) { | |
1968 | bdrv_io_limits_disable(bs); | |
1969 | } | |
33384421 HR |
1970 | |
1971 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
1972 | g_free(ban); | |
1973 | } | |
1974 | QLIST_INIT(&bs->aio_notifiers); | |
b338082b FB |
1975 | } |
1976 | ||
2bc93fed MK |
1977 | void bdrv_close_all(void) |
1978 | { | |
1979 | BlockDriverState *bs; | |
1980 | ||
dc364f4c | 1981 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
1982 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1983 | ||
1984 | aio_context_acquire(aio_context); | |
2bc93fed | 1985 | bdrv_close(bs); |
ed78cda3 | 1986 | aio_context_release(aio_context); |
2bc93fed MK |
1987 | } |
1988 | } | |
1989 | ||
88266f5a SH |
1990 | /* Check if any requests are in-flight (including throttled requests) */ |
1991 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1992 | { | |
1993 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1994 | return true; | |
1995 | } | |
cc0681c4 BC |
1996 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1997 | return true; | |
1998 | } | |
1999 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
2000 | return true; |
2001 | } | |
2002 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
2003 | return true; | |
2004 | } | |
2005 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
2006 | return true; | |
2007 | } | |
2008 | return false; | |
2009 | } | |
2010 | ||
5b98db0a SH |
2011 | static bool bdrv_drain_one(BlockDriverState *bs) |
2012 | { | |
2013 | bool bs_busy; | |
2014 | ||
2015 | bdrv_flush_io_queue(bs); | |
2016 | bdrv_start_throttled_reqs(bs); | |
2017 | bs_busy = bdrv_requests_pending(bs); | |
2018 | bs_busy |= aio_poll(bdrv_get_aio_context(bs), bs_busy); | |
2019 | return bs_busy; | |
2020 | } | |
2021 | ||
2022 | /* | |
2023 | * Wait for pending requests to complete on a single BlockDriverState subtree | |
2024 | * | |
2025 | * See the warning in bdrv_drain_all(). This function can only be called if | |
2026 | * you are sure nothing can generate I/O because you have op blockers | |
2027 | * installed. | |
2028 | * | |
2029 | * Note that unlike bdrv_drain_all(), the caller must hold the BlockDriverState | |
2030 | * AioContext. | |
2031 | */ | |
2032 | void bdrv_drain(BlockDriverState *bs) | |
2033 | { | |
2034 | while (bdrv_drain_one(bs)) { | |
2035 | /* Keep iterating */ | |
2036 | } | |
2037 | } | |
2038 | ||
922453bc SH |
2039 | /* |
2040 | * Wait for pending requests to complete across all BlockDriverStates | |
2041 | * | |
2042 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
2043 | * after calling this function. | |
4c355d53 ZYW |
2044 | * |
2045 | * Note that completion of an asynchronous I/O operation can trigger any | |
2046 | * number of other I/O operations on other devices---for example a coroutine | |
2047 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
2048 | * coroutine is complete. Because of this, it is not possible to have a | |
2049 | * function to drain a single device's I/O queue. | |
922453bc SH |
2050 | */ |
2051 | void bdrv_drain_all(void) | |
2052 | { | |
88266f5a SH |
2053 | /* Always run first iteration so any pending completion BHs run */ |
2054 | bool busy = true; | |
4f5472cb | 2055 | BlockDriverState *bs = NULL; |
922453bc | 2056 | |
4f5472cb | 2057 | while ((bs = bdrv_next(bs))) { |
69da3b0b FZ |
2058 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2059 | ||
2060 | aio_context_acquire(aio_context); | |
2061 | if (bs->job) { | |
2062 | block_job_pause(bs->job); | |
2063 | } | |
2064 | aio_context_release(aio_context); | |
2065 | } | |
2066 | ||
88266f5a | 2067 | while (busy) { |
9b536adc | 2068 | busy = false; |
4f5472cb | 2069 | bs = NULL; |
9b536adc | 2070 | |
4f5472cb | 2071 | while ((bs = bdrv_next(bs))) { |
9b536adc | 2072 | AioContext *aio_context = bdrv_get_aio_context(bs); |
9b536adc SH |
2073 | |
2074 | aio_context_acquire(aio_context); | |
5b98db0a | 2075 | busy |= bdrv_drain_one(bs); |
9b536adc | 2076 | aio_context_release(aio_context); |
9b536adc | 2077 | } |
922453bc | 2078 | } |
69da3b0b | 2079 | |
4f5472cb SH |
2080 | bs = NULL; |
2081 | while ((bs = bdrv_next(bs))) { | |
69da3b0b FZ |
2082 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2083 | ||
2084 | aio_context_acquire(aio_context); | |
2085 | if (bs->job) { | |
2086 | block_job_resume(bs->job); | |
2087 | } | |
2088 | aio_context_release(aio_context); | |
2089 | } | |
922453bc SH |
2090 | } |
2091 | ||
dc364f4c BC |
2092 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
2093 | * graph_bdrv_state list. | |
d22b2f41 RH |
2094 | Also, NULL terminate the device_name to prevent double remove */ |
2095 | void bdrv_make_anon(BlockDriverState *bs) | |
2096 | { | |
bfb197e0 MA |
2097 | /* |
2098 | * Take care to remove bs from bdrv_states only when it's actually | |
2099 | * in it. Note that bs->device_list.tqe_prev is initially null, | |
2100 | * and gets set to non-null by QTAILQ_INSERT_TAIL(). Establish | |
2101 | * the useful invariant "bs in bdrv_states iff bs->tqe_prev" by | |
2102 | * resetting it to null on remove. | |
2103 | */ | |
2104 | if (bs->device_list.tqe_prev) { | |
dc364f4c | 2105 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
bfb197e0 | 2106 | bs->device_list.tqe_prev = NULL; |
d22b2f41 | 2107 | } |
dc364f4c BC |
2108 | if (bs->node_name[0] != '\0') { |
2109 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
2110 | } | |
2111 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
2112 | } |
2113 | ||
e023b2e2 PB |
2114 | static void bdrv_rebind(BlockDriverState *bs) |
2115 | { | |
2116 | if (bs->drv && bs->drv->bdrv_rebind) { | |
2117 | bs->drv->bdrv_rebind(bs); | |
2118 | } | |
2119 | } | |
2120 | ||
4ddc07ca PB |
2121 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
2122 | BlockDriverState *bs_src) | |
8802d1fd | 2123 | { |
4ddc07ca | 2124 | /* move some fields that need to stay attached to the device */ |
8802d1fd JC |
2125 | |
2126 | /* dev info */ | |
1b7fd729 | 2127 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 2128 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 2129 | |
4ddc07ca | 2130 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 2131 | |
cc0681c4 BC |
2132 | /* i/o throttled req */ |
2133 | memcpy(&bs_dest->throttle_state, | |
2134 | &bs_src->throttle_state, | |
2135 | sizeof(ThrottleState)); | |
2136 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
2137 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 2138 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 2139 | |
8802d1fd | 2140 | /* r/w error */ |
4ddc07ca PB |
2141 | bs_dest->on_read_error = bs_src->on_read_error; |
2142 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
2143 | |
2144 | /* i/o status */ | |
4ddc07ca PB |
2145 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
2146 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 2147 | |
a9fc4408 | 2148 | /* dirty bitmap */ |
e4654d2d | 2149 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 2150 | |
9fcb0251 FZ |
2151 | /* reference count */ |
2152 | bs_dest->refcnt = bs_src->refcnt; | |
2153 | ||
a9fc4408 | 2154 | /* job */ |
4ddc07ca | 2155 | bs_dest->job = bs_src->job; |
a9fc4408 | 2156 | |
8802d1fd | 2157 | /* keep the same entry in bdrv_states */ |
dc364f4c | 2158 | bs_dest->device_list = bs_src->device_list; |
7e7d56d9 MA |
2159 | bs_dest->blk = bs_src->blk; |
2160 | ||
fbe40ff7 FZ |
2161 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
2162 | sizeof(bs_dest->op_blockers)); | |
4ddc07ca | 2163 | } |
8802d1fd | 2164 | |
4ddc07ca PB |
2165 | /* |
2166 | * Swap bs contents for two image chains while they are live, | |
2167 | * while keeping required fields on the BlockDriverState that is | |
2168 | * actually attached to a device. | |
2169 | * | |
2170 | * This will modify the BlockDriverState fields, and swap contents | |
2171 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
2172 | * | |
bfb197e0 | 2173 | * bs_new must not be attached to a BlockBackend. |
4ddc07ca PB |
2174 | * |
2175 | * This function does not create any image files. | |
2176 | */ | |
2177 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
2178 | { | |
2179 | BlockDriverState tmp; | |
f6801b83 | 2180 | |
90ce8a06 BC |
2181 | /* The code needs to swap the node_name but simply swapping node_list won't |
2182 | * work so first remove the nodes from the graph list, do the swap then | |
2183 | * insert them back if needed. | |
2184 | */ | |
2185 | if (bs_new->node_name[0] != '\0') { | |
2186 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); | |
2187 | } | |
2188 | if (bs_old->node_name[0] != '\0') { | |
2189 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); | |
2190 | } | |
2191 | ||
bfb197e0 | 2192 | /* bs_new must be unattached and shouldn't have anything fancy enabled */ |
7e7d56d9 | 2193 | assert(!bs_new->blk); |
e4654d2d | 2194 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca | 2195 | assert(bs_new->job == NULL); |
4ddc07ca | 2196 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2197 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 2198 | |
4ddc07ca PB |
2199 | tmp = *bs_new; |
2200 | *bs_new = *bs_old; | |
2201 | *bs_old = tmp; | |
a9fc4408 | 2202 | |
4ddc07ca PB |
2203 | /* there are some fields that should not be swapped, move them back */ |
2204 | bdrv_move_feature_fields(&tmp, bs_old); | |
2205 | bdrv_move_feature_fields(bs_old, bs_new); | |
2206 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 2207 | |
bfb197e0 | 2208 | /* bs_new must remain unattached */ |
7e7d56d9 | 2209 | assert(!bs_new->blk); |
4ddc07ca PB |
2210 | |
2211 | /* Check a few fields that should remain attached to the device */ | |
4ddc07ca | 2212 | assert(bs_new->job == NULL); |
4ddc07ca | 2213 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2214 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 | 2215 | |
90ce8a06 BC |
2216 | /* insert the nodes back into the graph node list if needed */ |
2217 | if (bs_new->node_name[0] != '\0') { | |
2218 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); | |
2219 | } | |
2220 | if (bs_old->node_name[0] != '\0') { | |
2221 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); | |
2222 | } | |
2223 | ||
e023b2e2 | 2224 | bdrv_rebind(bs_new); |
4ddc07ca PB |
2225 | bdrv_rebind(bs_old); |
2226 | } | |
2227 | ||
2228 | /* | |
2229 | * Add new bs contents at the top of an image chain while the chain is | |
2230 | * live, while keeping required fields on the top layer. | |
2231 | * | |
2232 | * This will modify the BlockDriverState fields, and swap contents | |
2233 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
2234 | * | |
bfb197e0 | 2235 | * bs_new must not be attached to a BlockBackend. |
4ddc07ca PB |
2236 | * |
2237 | * This function does not create any image files. | |
2238 | */ | |
2239 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
2240 | { | |
2241 | bdrv_swap(bs_new, bs_top); | |
2242 | ||
2243 | /* The contents of 'tmp' will become bs_top, as we are | |
2244 | * swapping bs_new and bs_top contents. */ | |
8d24cce1 | 2245 | bdrv_set_backing_hd(bs_top, bs_new); |
8802d1fd JC |
2246 | } |
2247 | ||
4f6fd349 | 2248 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 2249 | { |
3e914655 | 2250 | assert(!bs->job); |
3718d8ab | 2251 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 2252 | assert(!bs->refcnt); |
e4654d2d | 2253 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 2254 | |
e1b5c52e SH |
2255 | bdrv_close(bs); |
2256 | ||
1b7bdbc1 | 2257 | /* remove from list, if necessary */ |
d22b2f41 | 2258 | bdrv_make_anon(bs); |
34c6f050 | 2259 | |
7267c094 | 2260 | g_free(bs); |
fc01f7e7 FB |
2261 | } |
2262 | ||
e97fc193 AL |
2263 | /* |
2264 | * Run consistency checks on an image | |
2265 | * | |
e076f338 | 2266 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2267 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2268 | * check are stored in res. |
e97fc193 | 2269 | */ |
4534ff54 | 2270 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 | 2271 | { |
908bcd54 HR |
2272 | if (bs->drv == NULL) { |
2273 | return -ENOMEDIUM; | |
2274 | } | |
e97fc193 AL |
2275 | if (bs->drv->bdrv_check == NULL) { |
2276 | return -ENOTSUP; | |
2277 | } | |
2278 | ||
e076f338 | 2279 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2280 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2281 | } |
2282 | ||
8a426614 KW |
2283 | #define COMMIT_BUF_SECTORS 2048 |
2284 | ||
33e3963e FB |
2285 | /* commit COW file into the raw image */ |
2286 | int bdrv_commit(BlockDriverState *bs) | |
2287 | { | |
19cb3738 | 2288 | BlockDriver *drv = bs->drv; |
72706ea4 | 2289 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2290 | int n, ro, open_flags; |
0bce597d | 2291 | int ret = 0; |
72706ea4 | 2292 | uint8_t *buf = NULL; |
33e3963e | 2293 | |
19cb3738 FB |
2294 | if (!drv) |
2295 | return -ENOMEDIUM; | |
6bb45158 | 2296 | |
4dca4b63 NS |
2297 | if (!bs->backing_hd) { |
2298 | return -ENOTSUP; | |
33e3963e FB |
2299 | } |
2300 | ||
bb00021d FZ |
2301 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, NULL) || |
2302 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT_TARGET, NULL)) { | |
2d3735d3 SH |
2303 | return -EBUSY; |
2304 | } | |
2305 | ||
4dca4b63 | 2306 | ro = bs->backing_hd->read_only; |
4dca4b63 NS |
2307 | open_flags = bs->backing_hd->open_flags; |
2308 | ||
2309 | if (ro) { | |
0bce597d JC |
2310 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2311 | return -EACCES; | |
4dca4b63 | 2312 | } |
ea2384d3 | 2313 | } |
33e3963e | 2314 | |
72706ea4 JC |
2315 | length = bdrv_getlength(bs); |
2316 | if (length < 0) { | |
2317 | ret = length; | |
2318 | goto ro_cleanup; | |
2319 | } | |
2320 | ||
2321 | backing_length = bdrv_getlength(bs->backing_hd); | |
2322 | if (backing_length < 0) { | |
2323 | ret = backing_length; | |
2324 | goto ro_cleanup; | |
2325 | } | |
2326 | ||
2327 | /* If our top snapshot is larger than the backing file image, | |
2328 | * grow the backing file image if possible. If not possible, | |
2329 | * we must return an error */ | |
2330 | if (length > backing_length) { | |
2331 | ret = bdrv_truncate(bs->backing_hd, length); | |
2332 | if (ret < 0) { | |
2333 | goto ro_cleanup; | |
2334 | } | |
2335 | } | |
2336 | ||
2337 | total_sectors = length >> BDRV_SECTOR_BITS; | |
857d4f46 KW |
2338 | |
2339 | /* qemu_try_blockalign() for bs will choose an alignment that works for | |
2340 | * bs->backing_hd as well, so no need to compare the alignment manually. */ | |
2341 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
2342 | if (buf == NULL) { | |
2343 | ret = -ENOMEM; | |
2344 | goto ro_cleanup; | |
2345 | } | |
8a426614 KW |
2346 | |
2347 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2348 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2349 | if (ret < 0) { | |
2350 | goto ro_cleanup; | |
2351 | } | |
2352 | if (ret) { | |
dabfa6cc KW |
2353 | ret = bdrv_read(bs, sector, buf, n); |
2354 | if (ret < 0) { | |
8a426614 KW |
2355 | goto ro_cleanup; |
2356 | } | |
2357 | ||
dabfa6cc KW |
2358 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2359 | if (ret < 0) { | |
8a426614 KW |
2360 | goto ro_cleanup; |
2361 | } | |
ea2384d3 | 2362 | } |
33e3963e | 2363 | } |
95389c86 | 2364 | |
1d44952f CH |
2365 | if (drv->bdrv_make_empty) { |
2366 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2367 | if (ret < 0) { |
2368 | goto ro_cleanup; | |
2369 | } | |
1d44952f CH |
2370 | bdrv_flush(bs); |
2371 | } | |
95389c86 | 2372 | |
3f5075ae CH |
2373 | /* |
2374 | * Make sure all data we wrote to the backing device is actually | |
2375 | * stable on disk. | |
2376 | */ | |
dabfa6cc | 2377 | if (bs->backing_hd) { |
3f5075ae | 2378 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2379 | } |
4dca4b63 | 2380 | |
dabfa6cc | 2381 | ret = 0; |
4dca4b63 | 2382 | ro_cleanup: |
857d4f46 | 2383 | qemu_vfree(buf); |
4dca4b63 NS |
2384 | |
2385 | if (ro) { | |
0bce597d JC |
2386 | /* ignoring error return here */ |
2387 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2388 | } |
2389 | ||
1d44952f | 2390 | return ret; |
33e3963e FB |
2391 | } |
2392 | ||
e8877497 | 2393 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2394 | { |
2395 | BlockDriverState *bs; | |
2396 | ||
dc364f4c | 2397 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
2398 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2399 | ||
2400 | aio_context_acquire(aio_context); | |
272d2d8e JC |
2401 | if (bs->drv && bs->backing_hd) { |
2402 | int ret = bdrv_commit(bs); | |
2403 | if (ret < 0) { | |
ed78cda3 | 2404 | aio_context_release(aio_context); |
272d2d8e JC |
2405 | return ret; |
2406 | } | |
e8877497 | 2407 | } |
ed78cda3 | 2408 | aio_context_release(aio_context); |
6ab4b5ab | 2409 | } |
e8877497 | 2410 | return 0; |
6ab4b5ab MA |
2411 | } |
2412 | ||
dbffbdcf SH |
2413 | /** |
2414 | * Remove an active request from the tracked requests list | |
2415 | * | |
2416 | * This function should be called when a tracked request is completing. | |
2417 | */ | |
2418 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2419 | { | |
2dbafdc0 KW |
2420 | if (req->serialising) { |
2421 | req->bs->serialising_in_flight--; | |
2422 | } | |
2423 | ||
dbffbdcf | 2424 | QLIST_REMOVE(req, list); |
f4658285 | 2425 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2426 | } |
2427 | ||
2428 | /** | |
2429 | * Add an active request to the tracked requests list | |
2430 | */ | |
2431 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2432 | BlockDriverState *bs, | |
793ed47a KW |
2433 | int64_t offset, |
2434 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2435 | { |
2436 | *req = (BdrvTrackedRequest){ | |
2437 | .bs = bs, | |
2dbafdc0 KW |
2438 | .offset = offset, |
2439 | .bytes = bytes, | |
2440 | .is_write = is_write, | |
2441 | .co = qemu_coroutine_self(), | |
2442 | .serialising = false, | |
7327145f KW |
2443 | .overlap_offset = offset, |
2444 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2445 | }; |
2446 | ||
f4658285 SH |
2447 | qemu_co_queue_init(&req->wait_queue); |
2448 | ||
dbffbdcf SH |
2449 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2450 | } | |
2451 | ||
e96126ff | 2452 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2453 | { |
7327145f | 2454 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2455 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2456 | - overlap_offset; | |
7327145f | 2457 | |
2dbafdc0 KW |
2458 | if (!req->serialising) { |
2459 | req->bs->serialising_in_flight++; | |
2460 | req->serialising = true; | |
2461 | } | |
7327145f KW |
2462 | |
2463 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2464 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2465 | } |
2466 | ||
d83947ac SH |
2467 | /** |
2468 | * Round a region to cluster boundaries | |
2469 | */ | |
343bded4 PB |
2470 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2471 | int64_t sector_num, int nb_sectors, | |
2472 | int64_t *cluster_sector_num, | |
2473 | int *cluster_nb_sectors) | |
d83947ac SH |
2474 | { |
2475 | BlockDriverInfo bdi; | |
2476 | ||
2477 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2478 | *cluster_sector_num = sector_num; | |
2479 | *cluster_nb_sectors = nb_sectors; | |
2480 | } else { | |
2481 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2482 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2483 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2484 | nb_sectors, c); | |
2485 | } | |
2486 | } | |
2487 | ||
7327145f | 2488 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2489 | { |
2490 | BlockDriverInfo bdi; | |
7327145f | 2491 | int ret; |
793ed47a | 2492 | |
7327145f KW |
2493 | ret = bdrv_get_info(bs, &bdi); |
2494 | if (ret < 0 || bdi.cluster_size == 0) { | |
2495 | return bs->request_alignment; | |
793ed47a | 2496 | } else { |
7327145f | 2497 | return bdi.cluster_size; |
793ed47a KW |
2498 | } |
2499 | } | |
2500 | ||
f4658285 | 2501 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2502 | int64_t offset, unsigned int bytes) |
2503 | { | |
d83947ac | 2504 | /* aaaa bbbb */ |
7327145f | 2505 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2506 | return false; |
2507 | } | |
2508 | /* bbbb aaaa */ | |
7327145f | 2509 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2510 | return false; |
2511 | } | |
2512 | return true; | |
f4658285 SH |
2513 | } |
2514 | ||
28de2dcd | 2515 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2516 | { |
2dbafdc0 | 2517 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2518 | BdrvTrackedRequest *req; |
2519 | bool retry; | |
28de2dcd | 2520 | bool waited = false; |
f4658285 | 2521 | |
2dbafdc0 | 2522 | if (!bs->serialising_in_flight) { |
28de2dcd | 2523 | return false; |
2dbafdc0 KW |
2524 | } |
2525 | ||
f4658285 SH |
2526 | do { |
2527 | retry = false; | |
2528 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2529 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2530 | continue; |
2531 | } | |
7327145f KW |
2532 | if (tracked_request_overlaps(req, self->overlap_offset, |
2533 | self->overlap_bytes)) | |
2534 | { | |
5f8b6491 SH |
2535 | /* Hitting this means there was a reentrant request, for |
2536 | * example, a block driver issuing nested requests. This must | |
2537 | * never happen since it means deadlock. | |
2538 | */ | |
2539 | assert(qemu_coroutine_self() != req->co); | |
2540 | ||
6460440f KW |
2541 | /* If the request is already (indirectly) waiting for us, or |
2542 | * will wait for us as soon as it wakes up, then just go on | |
2543 | * (instead of producing a deadlock in the former case). */ | |
2544 | if (!req->waiting_for) { | |
2545 | self->waiting_for = req; | |
2546 | qemu_co_queue_wait(&req->wait_queue); | |
2547 | self->waiting_for = NULL; | |
2548 | retry = true; | |
28de2dcd | 2549 | waited = true; |
6460440f KW |
2550 | break; |
2551 | } | |
f4658285 SH |
2552 | } |
2553 | } | |
2554 | } while (retry); | |
28de2dcd KW |
2555 | |
2556 | return waited; | |
f4658285 SH |
2557 | } |
2558 | ||
756e6736 KW |
2559 | /* |
2560 | * Return values: | |
2561 | * 0 - success | |
2562 | * -EINVAL - backing format specified, but no file | |
2563 | * -ENOSPC - can't update the backing file because no space is left in the | |
2564 | * image file header | |
2565 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2566 | */ | |
2567 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2568 | const char *backing_file, const char *backing_fmt) | |
2569 | { | |
2570 | BlockDriver *drv = bs->drv; | |
469ef350 | 2571 | int ret; |
756e6736 | 2572 | |
5f377794 PB |
2573 | /* Backing file format doesn't make sense without a backing file */ |
2574 | if (backing_fmt && !backing_file) { | |
2575 | return -EINVAL; | |
2576 | } | |
2577 | ||
756e6736 | 2578 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2579 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2580 | } else { |
469ef350 | 2581 | ret = -ENOTSUP; |
756e6736 | 2582 | } |
469ef350 PB |
2583 | |
2584 | if (ret == 0) { | |
2585 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2586 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2587 | } | |
2588 | return ret; | |
756e6736 KW |
2589 | } |
2590 | ||
6ebdcee2 JC |
2591 | /* |
2592 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2593 | * | |
2594 | * active is the current topmost image. | |
2595 | * | |
2596 | * Returns NULL if bs is not found in active's image chain, | |
2597 | * or if active == bs. | |
4caf0fcd JC |
2598 | * |
2599 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
2600 | */ |
2601 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2602 | BlockDriverState *bs) | |
2603 | { | |
4caf0fcd JC |
2604 | while (active && bs != active->backing_hd) { |
2605 | active = active->backing_hd; | |
6ebdcee2 JC |
2606 | } |
2607 | ||
4caf0fcd JC |
2608 | return active; |
2609 | } | |
6ebdcee2 | 2610 | |
4caf0fcd JC |
2611 | /* Given a BDS, searches for the base layer. */ |
2612 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
2613 | { | |
2614 | return bdrv_find_overlay(bs, NULL); | |
6ebdcee2 JC |
2615 | } |
2616 | ||
2617 | typedef struct BlkIntermediateStates { | |
2618 | BlockDriverState *bs; | |
2619 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2620 | } BlkIntermediateStates; | |
2621 | ||
2622 | ||
2623 | /* | |
2624 | * Drops images above 'base' up to and including 'top', and sets the image | |
2625 | * above 'top' to have base as its backing file. | |
2626 | * | |
2627 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2628 | * information in 'bs' can be properly updated. | |
2629 | * | |
2630 | * E.g., this will convert the following chain: | |
2631 | * bottom <- base <- intermediate <- top <- active | |
2632 | * | |
2633 | * to | |
2634 | * | |
2635 | * bottom <- base <- active | |
2636 | * | |
2637 | * It is allowed for bottom==base, in which case it converts: | |
2638 | * | |
2639 | * base <- intermediate <- top <- active | |
2640 | * | |
2641 | * to | |
2642 | * | |
2643 | * base <- active | |
2644 | * | |
54e26900 JC |
2645 | * If backing_file_str is non-NULL, it will be used when modifying top's |
2646 | * overlay image metadata. | |
2647 | * | |
6ebdcee2 JC |
2648 | * Error conditions: |
2649 | * if active == top, that is considered an error | |
2650 | * | |
2651 | */ | |
2652 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
54e26900 | 2653 | BlockDriverState *base, const char *backing_file_str) |
6ebdcee2 JC |
2654 | { |
2655 | BlockDriverState *intermediate; | |
2656 | BlockDriverState *base_bs = NULL; | |
2657 | BlockDriverState *new_top_bs = NULL; | |
2658 | BlkIntermediateStates *intermediate_state, *next; | |
2659 | int ret = -EIO; | |
2660 | ||
2661 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2662 | QSIMPLEQ_INIT(&states_to_delete); | |
2663 | ||
2664 | if (!top->drv || !base->drv) { | |
2665 | goto exit; | |
2666 | } | |
2667 | ||
2668 | new_top_bs = bdrv_find_overlay(active, top); | |
2669 | ||
2670 | if (new_top_bs == NULL) { | |
2671 | /* we could not find the image above 'top', this is an error */ | |
2672 | goto exit; | |
2673 | } | |
2674 | ||
2675 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2676 | * to do, no intermediate images */ | |
2677 | if (new_top_bs->backing_hd == base) { | |
2678 | ret = 0; | |
2679 | goto exit; | |
2680 | } | |
2681 | ||
2682 | intermediate = top; | |
2683 | ||
2684 | /* now we will go down through the list, and add each BDS we find | |
2685 | * into our deletion queue, until we hit the 'base' | |
2686 | */ | |
2687 | while (intermediate) { | |
5839e53b | 2688 | intermediate_state = g_new0(BlkIntermediateStates, 1); |
6ebdcee2 JC |
2689 | intermediate_state->bs = intermediate; |
2690 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2691 | ||
2692 | if (intermediate->backing_hd == base) { | |
2693 | base_bs = intermediate->backing_hd; | |
2694 | break; | |
2695 | } | |
2696 | intermediate = intermediate->backing_hd; | |
2697 | } | |
2698 | if (base_bs == NULL) { | |
2699 | /* something went wrong, we did not end at the base. safely | |
2700 | * unravel everything, and exit with error */ | |
2701 | goto exit; | |
2702 | } | |
2703 | ||
2704 | /* success - we can delete the intermediate states, and link top->base */ | |
54e26900 JC |
2705 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
2706 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, | |
6ebdcee2 JC |
2707 | base_bs->drv ? base_bs->drv->format_name : ""); |
2708 | if (ret) { | |
2709 | goto exit; | |
2710 | } | |
920beae1 | 2711 | bdrv_set_backing_hd(new_top_bs, base_bs); |
6ebdcee2 JC |
2712 | |
2713 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2714 | /* so that bdrv_close() does not recursively close the chain */ | |
920beae1 | 2715 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
4f6fd349 | 2716 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2717 | } |
2718 | ret = 0; | |
2719 | ||
2720 | exit: | |
2721 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2722 | g_free(intermediate_state); | |
2723 | } | |
2724 | return ret; | |
2725 | } | |
2726 | ||
2727 | ||
71d0770c AL |
2728 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2729 | size_t size) | |
2730 | { | |
75af1f34 | 2731 | if (size > BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) { |
1dd3a447 KW |
2732 | return -EIO; |
2733 | } | |
2734 | ||
c0191e76 | 2735 | if (!bdrv_is_inserted(bs)) { |
71d0770c | 2736 | return -ENOMEDIUM; |
c0191e76 | 2737 | } |
71d0770c | 2738 | |
c0191e76 | 2739 | if (offset < 0) { |
71d0770c | 2740 | return -EIO; |
c0191e76 | 2741 | } |
71d0770c AL |
2742 | |
2743 | return 0; | |
2744 | } | |
2745 | ||
2746 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2747 | int nb_sectors) | |
2748 | { | |
75af1f34 | 2749 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
8f4754ed KW |
2750 | return -EIO; |
2751 | } | |
2752 | ||
eb5a3165 JS |
2753 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2754 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2755 | } |
2756 | ||
1c9805a3 SH |
2757 | typedef struct RwCo { |
2758 | BlockDriverState *bs; | |
775aa8b6 | 2759 | int64_t offset; |
1c9805a3 SH |
2760 | QEMUIOVector *qiov; |
2761 | bool is_write; | |
2762 | int ret; | |
4105eaaa | 2763 | BdrvRequestFlags flags; |
1c9805a3 SH |
2764 | } RwCo; |
2765 | ||
2766 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2767 | { |
1c9805a3 | 2768 | RwCo *rwco = opaque; |
ea2384d3 | 2769 | |
1c9805a3 | 2770 | if (!rwco->is_write) { |
775aa8b6 KW |
2771 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2772 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2773 | rwco->flags); |
775aa8b6 KW |
2774 | } else { |
2775 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2776 | rwco->qiov->size, rwco->qiov, | |
2777 | rwco->flags); | |
1c9805a3 SH |
2778 | } |
2779 | } | |
e7a8a783 | 2780 | |
1c9805a3 | 2781 | /* |
8d3b1a2d | 2782 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2783 | */ |
775aa8b6 KW |
2784 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2785 | QEMUIOVector *qiov, bool is_write, | |
2786 | BdrvRequestFlags flags) | |
1c9805a3 | 2787 | { |
1c9805a3 SH |
2788 | Coroutine *co; |
2789 | RwCo rwco = { | |
2790 | .bs = bs, | |
775aa8b6 | 2791 | .offset = offset, |
8d3b1a2d | 2792 | .qiov = qiov, |
1c9805a3 SH |
2793 | .is_write = is_write, |
2794 | .ret = NOT_DONE, | |
4105eaaa | 2795 | .flags = flags, |
1c9805a3 | 2796 | }; |
e7a8a783 | 2797 | |
498e386c ZYW |
2798 | /** |
2799 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2800 | * will not fire; so the I/O throttling function has to be disabled here | |
2801 | * if it has been enabled. | |
2802 | */ | |
2803 | if (bs->io_limits_enabled) { | |
2804 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2805 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2806 | bdrv_io_limits_disable(bs); | |
2807 | } | |
2808 | ||
1c9805a3 SH |
2809 | if (qemu_in_coroutine()) { |
2810 | /* Fast-path if already in coroutine context */ | |
2811 | bdrv_rw_co_entry(&rwco); | |
2812 | } else { | |
2572b37a SH |
2813 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2814 | ||
1c9805a3 SH |
2815 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
2816 | qemu_coroutine_enter(co, &rwco); | |
2817 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 2818 | aio_poll(aio_context, true); |
1c9805a3 SH |
2819 | } |
2820 | } | |
2821 | return rwco.ret; | |
2822 | } | |
b338082b | 2823 | |
8d3b1a2d KW |
2824 | /* |
2825 | * Process a synchronous request using coroutines | |
2826 | */ | |
2827 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2828 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2829 | { |
2830 | QEMUIOVector qiov; | |
2831 | struct iovec iov = { | |
2832 | .iov_base = (void *)buf, | |
2833 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2834 | }; | |
2835 | ||
75af1f34 | 2836 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
da15ee51 KW |
2837 | return -EINVAL; |
2838 | } | |
2839 | ||
8d3b1a2d | 2840 | qemu_iovec_init_external(&qiov, &iov, 1); |
775aa8b6 KW |
2841 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2842 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2843 | } |
2844 | ||
1c9805a3 SH |
2845 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2846 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2847 | uint8_t *buf, int nb_sectors) | |
2848 | { | |
4105eaaa | 2849 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2850 | } |
2851 | ||
07d27a44 MA |
2852 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2853 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2854 | uint8_t *buf, int nb_sectors) | |
2855 | { | |
2856 | bool enabled; | |
2857 | int ret; | |
2858 | ||
2859 | enabled = bs->io_limits_enabled; | |
2860 | bs->io_limits_enabled = false; | |
4e7395e8 | 2861 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2862 | bs->io_limits_enabled = enabled; |
2863 | return ret; | |
2864 | } | |
2865 | ||
5fafdf24 | 2866 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2867 | -EIO generic I/O error (may happen for all errors) |
2868 | -ENOMEDIUM No media inserted. | |
2869 | -EINVAL Invalid sector number or nb_sectors | |
2870 | -EACCES Trying to write a read-only device | |
2871 | */ | |
5fafdf24 | 2872 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2873 | const uint8_t *buf, int nb_sectors) |
2874 | { | |
4105eaaa | 2875 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2876 | } |
2877 | ||
aa7bfbff PL |
2878 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2879 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2880 | { |
2881 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2882 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2883 | } |
2884 | ||
d75cbb5e PL |
2885 | /* |
2886 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2887 | * The operation is sped up by checking the block status and only writing | |
2888 | * zeroes to the device if they currently do not return zeroes. Optional | |
2889 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2890 | * | |
2891 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2892 | */ | |
2893 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2894 | { | |
d32f7c10 | 2895 | int64_t target_sectors, ret, nb_sectors, sector_num = 0; |
d75cbb5e PL |
2896 | int n; |
2897 | ||
d32f7c10 MA |
2898 | target_sectors = bdrv_nb_sectors(bs); |
2899 | if (target_sectors < 0) { | |
2900 | return target_sectors; | |
9ce10c0b | 2901 | } |
9ce10c0b | 2902 | |
d75cbb5e | 2903 | for (;;) { |
75af1f34 | 2904 | nb_sectors = MIN(target_sectors - sector_num, BDRV_REQUEST_MAX_SECTORS); |
d75cbb5e PL |
2905 | if (nb_sectors <= 0) { |
2906 | return 0; | |
2907 | } | |
d75cbb5e | 2908 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); |
3d94ce60 PL |
2909 | if (ret < 0) { |
2910 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2911 | sector_num, strerror(-ret)); | |
2912 | return ret; | |
2913 | } | |
d75cbb5e PL |
2914 | if (ret & BDRV_BLOCK_ZERO) { |
2915 | sector_num += n; | |
2916 | continue; | |
2917 | } | |
2918 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2919 | if (ret < 0) { | |
2920 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2921 | sector_num, strerror(-ret)); | |
2922 | return ret; | |
2923 | } | |
2924 | sector_num += n; | |
2925 | } | |
2926 | } | |
2927 | ||
a3ef6571 | 2928 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2929 | { |
a3ef6571 KW |
2930 | QEMUIOVector qiov; |
2931 | struct iovec iov = { | |
2932 | .iov_base = (void *)buf, | |
2933 | .iov_len = bytes, | |
2934 | }; | |
9a8c4cce | 2935 | int ret; |
83f64091 | 2936 | |
a3ef6571 KW |
2937 | if (bytes < 0) { |
2938 | return -EINVAL; | |
83f64091 FB |
2939 | } |
2940 | ||
a3ef6571 KW |
2941 | qemu_iovec_init_external(&qiov, &iov, 1); |
2942 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2943 | if (ret < 0) { | |
2944 | return ret; | |
83f64091 | 2945 | } |
a3ef6571 KW |
2946 | |
2947 | return bytes; | |
83f64091 FB |
2948 | } |
2949 | ||
8d3b1a2d | 2950 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2951 | { |
9a8c4cce | 2952 | int ret; |
83f64091 | 2953 | |
8407d5d7 KW |
2954 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2955 | if (ret < 0) { | |
2956 | return ret; | |
83f64091 FB |
2957 | } |
2958 | ||
8d3b1a2d KW |
2959 | return qiov->size; |
2960 | } | |
2961 | ||
2962 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2963 | const void *buf, int bytes) |
8d3b1a2d KW |
2964 | { |
2965 | QEMUIOVector qiov; | |
2966 | struct iovec iov = { | |
2967 | .iov_base = (void *) buf, | |
8407d5d7 | 2968 | .iov_len = bytes, |
8d3b1a2d KW |
2969 | }; |
2970 | ||
8407d5d7 KW |
2971 | if (bytes < 0) { |
2972 | return -EINVAL; | |
2973 | } | |
2974 | ||
8d3b1a2d KW |
2975 | qemu_iovec_init_external(&qiov, &iov, 1); |
2976 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2977 | } |
83f64091 | 2978 | |
f08145fe KW |
2979 | /* |
2980 | * Writes to the file and ensures that no writes are reordered across this | |
2981 | * request (acts as a barrier) | |
2982 | * | |
2983 | * Returns 0 on success, -errno in error cases. | |
2984 | */ | |
2985 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2986 | const void *buf, int count) | |
2987 | { | |
2988 | int ret; | |
2989 | ||
2990 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2991 | if (ret < 0) { | |
2992 | return ret; | |
2993 | } | |
2994 | ||
f05fa4ad PB |
2995 | /* No flush needed for cache modes that already do it */ |
2996 | if (bs->enable_write_cache) { | |
f08145fe KW |
2997 | bdrv_flush(bs); |
2998 | } | |
2999 | ||
3000 | return 0; | |
3001 | } | |
3002 | ||
470c0504 | 3003 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
3004 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
3005 | { | |
3006 | /* Perform I/O through a temporary buffer so that users who scribble over | |
3007 | * their read buffer while the operation is in progress do not end up | |
3008 | * modifying the image file. This is critical for zero-copy guest I/O | |
3009 | * where anything might happen inside guest memory. | |
3010 | */ | |
3011 | void *bounce_buffer; | |
3012 | ||
79c053bd | 3013 | BlockDriver *drv = bs->drv; |
ab185921 SH |
3014 | struct iovec iov; |
3015 | QEMUIOVector bounce_qiov; | |
3016 | int64_t cluster_sector_num; | |
3017 | int cluster_nb_sectors; | |
3018 | size_t skip_bytes; | |
3019 | int ret; | |
3020 | ||
3021 | /* Cover entire cluster so no additional backing file I/O is required when | |
3022 | * allocating cluster in the image file. | |
3023 | */ | |
343bded4 PB |
3024 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
3025 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 3026 | |
470c0504 SH |
3027 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
3028 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
3029 | |
3030 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
857d4f46 KW |
3031 | iov.iov_base = bounce_buffer = qemu_try_blockalign(bs, iov.iov_len); |
3032 | if (bounce_buffer == NULL) { | |
3033 | ret = -ENOMEM; | |
3034 | goto err; | |
3035 | } | |
3036 | ||
ab185921 SH |
3037 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
3038 | ||
79c053bd SH |
3039 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
3040 | &bounce_qiov); | |
ab185921 SH |
3041 | if (ret < 0) { |
3042 | goto err; | |
3043 | } | |
3044 | ||
79c053bd SH |
3045 | if (drv->bdrv_co_write_zeroes && |
3046 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 3047 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 3048 | cluster_nb_sectors, 0); |
79c053bd | 3049 | } else { |
f05fa4ad PB |
3050 | /* This does not change the data on the disk, it is not necessary |
3051 | * to flush even in cache=writethrough mode. | |
3052 | */ | |
79c053bd | 3053 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 3054 | &bounce_qiov); |
79c053bd SH |
3055 | } |
3056 | ||
ab185921 SH |
3057 | if (ret < 0) { |
3058 | /* It might be okay to ignore write errors for guest requests. If this | |
3059 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
3060 | * Simply report it in all cases. | |
3061 | */ | |
3062 | goto err; | |
3063 | } | |
3064 | ||
3065 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
3066 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
3067 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
3068 | |
3069 | err: | |
3070 | qemu_vfree(bounce_buffer); | |
3071 | return ret; | |
3072 | } | |
3073 | ||
c5fbe571 | 3074 | /* |
d0c7f642 KW |
3075 | * Forwards an already correctly aligned request to the BlockDriver. This |
3076 | * handles copy on read and zeroing after EOF; any other features must be | |
3077 | * implemented by the caller. | |
c5fbe571 | 3078 | */ |
d0c7f642 | 3079 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 3080 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 3081 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
3082 | { |
3083 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3084 | int ret; |
da1fa91d | 3085 | |
d0c7f642 KW |
3086 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3087 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 3088 | |
d0c7f642 KW |
3089 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3090 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3091 | assert(!qiov || bytes == qiov->size); |
d0c7f642 KW |
3092 | |
3093 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 3094 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
3095 | /* If we touch the same cluster it counts as an overlap. This |
3096 | * guarantees that allocating writes will be serialized and not race | |
3097 | * with each other for the same cluster. For example, in copy-on-read | |
3098 | * it ensures that the CoR read and write operations are atomic and | |
3099 | * guest writes cannot interleave between them. */ | |
3100 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
3101 | } |
3102 | ||
2dbafdc0 | 3103 | wait_serialising_requests(req); |
f4658285 | 3104 | |
470c0504 | 3105 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
3106 | int pnum; |
3107 | ||
bdad13b9 | 3108 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
3109 | if (ret < 0) { |
3110 | goto out; | |
3111 | } | |
3112 | ||
3113 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 3114 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
3115 | goto out; |
3116 | } | |
3117 | } | |
3118 | ||
d0c7f642 | 3119 | /* Forward the request to the BlockDriver */ |
c0191e76 | 3120 | if (!bs->zero_beyond_eof) { |
893a8f62 MK |
3121 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
3122 | } else { | |
c0191e76 | 3123 | /* Read zeros after EOF */ |
4049082c | 3124 | int64_t total_sectors, max_nb_sectors; |
893a8f62 | 3125 | |
4049082c MA |
3126 | total_sectors = bdrv_nb_sectors(bs); |
3127 | if (total_sectors < 0) { | |
3128 | ret = total_sectors; | |
893a8f62 MK |
3129 | goto out; |
3130 | } | |
3131 | ||
5f5bcd80 KW |
3132 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
3133 | align >> BDRV_SECTOR_BITS); | |
e012b78c PB |
3134 | if (nb_sectors < max_nb_sectors) { |
3135 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
3136 | } else if (max_nb_sectors > 0) { | |
33f461e0 | 3137 | QEMUIOVector local_qiov; |
33f461e0 KW |
3138 | |
3139 | qemu_iovec_init(&local_qiov, qiov->niov); | |
3140 | qemu_iovec_concat(&local_qiov, qiov, 0, | |
e012b78c | 3141 | max_nb_sectors * BDRV_SECTOR_SIZE); |
33f461e0 | 3142 | |
e012b78c | 3143 | ret = drv->bdrv_co_readv(bs, sector_num, max_nb_sectors, |
33f461e0 KW |
3144 | &local_qiov); |
3145 | ||
3146 | qemu_iovec_destroy(&local_qiov); | |
893a8f62 MK |
3147 | } else { |
3148 | ret = 0; | |
3149 | } | |
3150 | ||
3151 | /* Reading beyond end of file is supposed to produce zeroes */ | |
3152 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
3153 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
3154 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
3155 | BDRV_SECTOR_SIZE; | |
3156 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
3157 | } | |
3158 | } | |
ab185921 SH |
3159 | |
3160 | out: | |
dbffbdcf | 3161 | return ret; |
da1fa91d KW |
3162 | } |
3163 | ||
fc3959e4 FZ |
3164 | static inline uint64_t bdrv_get_align(BlockDriverState *bs) |
3165 | { | |
3166 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ | |
3167 | return MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3168 | } | |
3169 | ||
3170 | static inline bool bdrv_req_is_aligned(BlockDriverState *bs, | |
3171 | int64_t offset, size_t bytes) | |
3172 | { | |
3173 | int64_t align = bdrv_get_align(bs); | |
3174 | return !(offset & (align - 1) || (bytes & (align - 1))); | |
3175 | } | |
3176 | ||
d0c7f642 KW |
3177 | /* |
3178 | * Handle a read request in coroutine context | |
3179 | */ | |
1b0288ae KW |
3180 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
3181 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
3182 | BdrvRequestFlags flags) |
3183 | { | |
3184 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
3185 | BdrvTrackedRequest req; |
3186 | ||
fc3959e4 | 3187 | uint64_t align = bdrv_get_align(bs); |
1b0288ae KW |
3188 | uint8_t *head_buf = NULL; |
3189 | uint8_t *tail_buf = NULL; | |
3190 | QEMUIOVector local_qiov; | |
3191 | bool use_local_qiov = false; | |
d0c7f642 KW |
3192 | int ret; |
3193 | ||
3194 | if (!drv) { | |
3195 | return -ENOMEDIUM; | |
3196 | } | |
b9c64947 HR |
3197 | |
3198 | ret = bdrv_check_byte_request(bs, offset, bytes); | |
3199 | if (ret < 0) { | |
3200 | return ret; | |
d0c7f642 KW |
3201 | } |
3202 | ||
3203 | if (bs->copy_on_read) { | |
3204 | flags |= BDRV_REQ_COPY_ON_READ; | |
3205 | } | |
3206 | ||
3207 | /* throttling disk I/O */ | |
3208 | if (bs->io_limits_enabled) { | |
d5103588 | 3209 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3210 | } |
3211 | ||
3212 | /* Align read if necessary by padding qiov */ | |
3213 | if (offset & (align - 1)) { | |
3214 | head_buf = qemu_blockalign(bs, align); | |
3215 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3216 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3217 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3218 | use_local_qiov = true; | |
3219 | ||
3220 | bytes += offset & (align - 1); | |
3221 | offset = offset & ~(align - 1); | |
3222 | } | |
3223 | ||
3224 | if ((offset + bytes) & (align - 1)) { | |
3225 | if (!use_local_qiov) { | |
3226 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3227 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3228 | use_local_qiov = true; | |
3229 | } | |
3230 | tail_buf = qemu_blockalign(bs, align); | |
3231 | qemu_iovec_add(&local_qiov, tail_buf, | |
3232 | align - ((offset + bytes) & (align - 1))); | |
3233 | ||
3234 | bytes = ROUND_UP(bytes, align); | |
3235 | } | |
3236 | ||
65afd211 | 3237 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3238 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3239 | use_local_qiov ? &local_qiov : qiov, |
3240 | flags); | |
65afd211 | 3241 | tracked_request_end(&req); |
1b0288ae KW |
3242 | |
3243 | if (use_local_qiov) { | |
3244 | qemu_iovec_destroy(&local_qiov); | |
3245 | qemu_vfree(head_buf); | |
3246 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3247 | } |
3248 | ||
d0c7f642 KW |
3249 | return ret; |
3250 | } | |
3251 | ||
1b0288ae KW |
3252 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3253 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3254 | BdrvRequestFlags flags) | |
3255 | { | |
75af1f34 | 3256 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
1b0288ae KW |
3257 | return -EINVAL; |
3258 | } | |
3259 | ||
3260 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3261 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3262 | } | |
3263 | ||
c5fbe571 | 3264 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3265 | int nb_sectors, QEMUIOVector *qiov) |
3266 | { | |
c5fbe571 | 3267 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3268 | |
470c0504 SH |
3269 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3270 | } | |
3271 | ||
3272 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3273 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3274 | { | |
3275 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3276 | ||
3277 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3278 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3279 | } |
3280 | ||
98764152 | 3281 | #define MAX_WRITE_ZEROES_BOUNCE_BUFFER 32768 |
c31cb707 | 3282 | |
f08f2dda | 3283 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3284 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3285 | { |
3286 | BlockDriver *drv = bs->drv; | |
3287 | QEMUIOVector qiov; | |
c31cb707 PL |
3288 | struct iovec iov = {0}; |
3289 | int ret = 0; | |
f08f2dda | 3290 | |
75af1f34 PL |
3291 | int max_write_zeroes = MIN_NON_ZERO(bs->bl.max_write_zeroes, |
3292 | BDRV_REQUEST_MAX_SECTORS); | |
621f0589 | 3293 | |
c31cb707 PL |
3294 | while (nb_sectors > 0 && !ret) { |
3295 | int num = nb_sectors; | |
3296 | ||
b8d71c09 PB |
3297 | /* Align request. Block drivers can expect the "bulk" of the request |
3298 | * to be aligned. | |
3299 | */ | |
3300 | if (bs->bl.write_zeroes_alignment | |
3301 | && num > bs->bl.write_zeroes_alignment) { | |
3302 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3303 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3304 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3305 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3306 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3307 | /* Shorten the request to the last aligned sector. num cannot | |
3308 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3309 | */ | |
3310 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3311 | } |
621f0589 | 3312 | } |
f08f2dda | 3313 | |
c31cb707 PL |
3314 | /* limit request size */ |
3315 | if (num > max_write_zeroes) { | |
3316 | num = max_write_zeroes; | |
3317 | } | |
3318 | ||
3319 | ret = -ENOTSUP; | |
3320 | /* First try the efficient write zeroes operation */ | |
3321 | if (drv->bdrv_co_write_zeroes) { | |
3322 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3323 | } | |
3324 | ||
3325 | if (ret == -ENOTSUP) { | |
3326 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
095e4fa4 | 3327 | int max_xfer_len = MIN_NON_ZERO(bs->bl.max_transfer_length, |
98764152 | 3328 | MAX_WRITE_ZEROES_BOUNCE_BUFFER); |
095e4fa4 | 3329 | num = MIN(num, max_xfer_len); |
c31cb707 PL |
3330 | iov.iov_len = num * BDRV_SECTOR_SIZE; |
3331 | if (iov.iov_base == NULL) { | |
857d4f46 KW |
3332 | iov.iov_base = qemu_try_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3333 | if (iov.iov_base == NULL) { | |
3334 | ret = -ENOMEM; | |
3335 | goto fail; | |
3336 | } | |
b8d71c09 | 3337 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); |
c31cb707 PL |
3338 | } |
3339 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3340 | |
c31cb707 | 3341 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3342 | |
3343 | /* Keep bounce buffer around if it is big enough for all | |
3344 | * all future requests. | |
3345 | */ | |
095e4fa4 | 3346 | if (num < max_xfer_len) { |
b8d71c09 PB |
3347 | qemu_vfree(iov.iov_base); |
3348 | iov.iov_base = NULL; | |
3349 | } | |
c31cb707 PL |
3350 | } |
3351 | ||
3352 | sector_num += num; | |
3353 | nb_sectors -= num; | |
3354 | } | |
f08f2dda | 3355 | |
857d4f46 | 3356 | fail: |
f08f2dda SH |
3357 | qemu_vfree(iov.iov_base); |
3358 | return ret; | |
3359 | } | |
3360 | ||
c5fbe571 | 3361 | /* |
b404f720 | 3362 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3363 | */ |
b404f720 | 3364 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3365 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3366 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3367 | { |
3368 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3369 | bool waited; |
6b7cb247 | 3370 | int ret; |
da1fa91d | 3371 | |
b404f720 KW |
3372 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3373 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3374 | |
b404f720 KW |
3375 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3376 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3377 | assert(!qiov || bytes == qiov->size); |
cc0681c4 | 3378 | |
28de2dcd KW |
3379 | waited = wait_serialising_requests(req); |
3380 | assert(!waited || !req->serialising); | |
af91f9a7 KW |
3381 | assert(req->overlap_offset <= offset); |
3382 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); | |
244eadef | 3383 | |
65afd211 | 3384 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
d616b224 | 3385 | |
465bee1d PL |
3386 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
3387 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && | |
3388 | qemu_iovec_is_zero(qiov)) { | |
3389 | flags |= BDRV_REQ_ZERO_WRITE; | |
3390 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { | |
3391 | flags |= BDRV_REQ_MAY_UNMAP; | |
3392 | } | |
3393 | } | |
3394 | ||
d616b224 SH |
3395 | if (ret < 0) { |
3396 | /* Do nothing, write notifier decided to fail this request */ | |
3397 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
9e1cb96d | 3398 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
aa7bfbff | 3399 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3400 | } else { |
9e1cb96d | 3401 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
f08f2dda SH |
3402 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
3403 | } | |
9e1cb96d | 3404 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
6b7cb247 | 3405 | |
f05fa4ad PB |
3406 | if (ret == 0 && !bs->enable_write_cache) { |
3407 | ret = bdrv_co_flush(bs); | |
3408 | } | |
3409 | ||
e4654d2d | 3410 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d | 3411 | |
5366d0c8 | 3412 | block_acct_highest_sector(&bs->stats, sector_num, nb_sectors); |
5e5a94b6 | 3413 | |
c0191e76 | 3414 | if (ret >= 0) { |
df2a6f29 PB |
3415 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); |
3416 | } | |
da1fa91d | 3417 | |
6b7cb247 | 3418 | return ret; |
da1fa91d KW |
3419 | } |
3420 | ||
b404f720 KW |
3421 | /* |
3422 | * Handle a write request in coroutine context | |
3423 | */ | |
6601553e KW |
3424 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3425 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3426 | BdrvRequestFlags flags) |
3427 | { | |
65afd211 | 3428 | BdrvTrackedRequest req; |
fc3959e4 | 3429 | uint64_t align = bdrv_get_align(bs); |
3b8242e0 KW |
3430 | uint8_t *head_buf = NULL; |
3431 | uint8_t *tail_buf = NULL; | |
3432 | QEMUIOVector local_qiov; | |
3433 | bool use_local_qiov = false; | |
b404f720 KW |
3434 | int ret; |
3435 | ||
3436 | if (!bs->drv) { | |
3437 | return -ENOMEDIUM; | |
3438 | } | |
3439 | if (bs->read_only) { | |
3440 | return -EACCES; | |
3441 | } | |
b9c64947 HR |
3442 | |
3443 | ret = bdrv_check_byte_request(bs, offset, bytes); | |
3444 | if (ret < 0) { | |
3445 | return ret; | |
b404f720 KW |
3446 | } |
3447 | ||
b404f720 KW |
3448 | /* throttling disk I/O */ |
3449 | if (bs->io_limits_enabled) { | |
d5103588 | 3450 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3451 | } |
3452 | ||
3b8242e0 KW |
3453 | /* |
3454 | * Align write if necessary by performing a read-modify-write cycle. | |
3455 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3456 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3457 | */ | |
65afd211 | 3458 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3459 | |
3460 | if (offset & (align - 1)) { | |
3461 | QEMUIOVector head_qiov; | |
3462 | struct iovec head_iov; | |
3463 | ||
3464 | mark_request_serialising(&req, align); | |
3465 | wait_serialising_requests(&req); | |
3466 | ||
3467 | head_buf = qemu_blockalign(bs, align); | |
3468 | head_iov = (struct iovec) { | |
3469 | .iov_base = head_buf, | |
3470 | .iov_len = align, | |
3471 | }; | |
3472 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3473 | ||
9e1cb96d | 3474 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3475 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3476 | align, &head_qiov, 0); | |
3477 | if (ret < 0) { | |
3478 | goto fail; | |
3479 | } | |
9e1cb96d | 3480 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3481 | |
3482 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3483 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3484 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3485 | use_local_qiov = true; | |
3486 | ||
3487 | bytes += offset & (align - 1); | |
3488 | offset = offset & ~(align - 1); | |
3489 | } | |
3490 | ||
3491 | if ((offset + bytes) & (align - 1)) { | |
3492 | QEMUIOVector tail_qiov; | |
3493 | struct iovec tail_iov; | |
3494 | size_t tail_bytes; | |
28de2dcd | 3495 | bool waited; |
3b8242e0 KW |
3496 | |
3497 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3498 | waited = wait_serialising_requests(&req); |
3499 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3500 | |
3501 | tail_buf = qemu_blockalign(bs, align); | |
3502 | tail_iov = (struct iovec) { | |
3503 | .iov_base = tail_buf, | |
3504 | .iov_len = align, | |
3505 | }; | |
3506 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3507 | ||
9e1cb96d | 3508 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3509 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3510 | align, &tail_qiov, 0); | |
3511 | if (ret < 0) { | |
3512 | goto fail; | |
3513 | } | |
9e1cb96d | 3514 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3515 | |
3516 | if (!use_local_qiov) { | |
3517 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3518 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3519 | use_local_qiov = true; | |
3520 | } | |
3521 | ||
3522 | tail_bytes = (offset + bytes) & (align - 1); | |
3523 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3524 | ||
3525 | bytes = ROUND_UP(bytes, align); | |
3526 | } | |
3527 | ||
fc3959e4 FZ |
3528 | if (use_local_qiov) { |
3529 | /* Local buffer may have non-zero data. */ | |
3530 | flags &= ~BDRV_REQ_ZERO_WRITE; | |
3531 | } | |
3b8242e0 KW |
3532 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, |
3533 | use_local_qiov ? &local_qiov : qiov, | |
3534 | flags); | |
3535 | ||
3536 | fail: | |
65afd211 | 3537 | tracked_request_end(&req); |
b404f720 | 3538 | |
3b8242e0 KW |
3539 | if (use_local_qiov) { |
3540 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3541 | } |
99c4a85c KW |
3542 | qemu_vfree(head_buf); |
3543 | qemu_vfree(tail_buf); | |
3b8242e0 | 3544 | |
b404f720 KW |
3545 | return ret; |
3546 | } | |
3547 | ||
6601553e KW |
3548 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3549 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3550 | BdrvRequestFlags flags) | |
3551 | { | |
75af1f34 | 3552 | if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
6601553e KW |
3553 | return -EINVAL; |
3554 | } | |
3555 | ||
3556 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3557 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3558 | } | |
3559 | ||
c5fbe571 SH |
3560 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3561 | int nb_sectors, QEMUIOVector *qiov) | |
3562 | { | |
3563 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3564 | ||
f08f2dda SH |
3565 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3566 | } | |
3567 | ||
3568 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3569 | int64_t sector_num, int nb_sectors, |
3570 | BdrvRequestFlags flags) | |
f08f2dda | 3571 | { |
fc3959e4 FZ |
3572 | int ret; |
3573 | ||
94d6ff21 | 3574 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3575 | |
d32f35cb PL |
3576 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3577 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3578 | } | |
fc3959e4 FZ |
3579 | if (bdrv_req_is_aligned(bs, sector_num << BDRV_SECTOR_BITS, |
3580 | nb_sectors << BDRV_SECTOR_BITS)) { | |
3581 | ret = bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
3582 | BDRV_REQ_ZERO_WRITE | flags); | |
3583 | } else { | |
3584 | uint8_t *buf; | |
3585 | QEMUIOVector local_qiov; | |
3586 | size_t bytes = nb_sectors << BDRV_SECTOR_BITS; | |
3587 | ||
3588 | buf = qemu_memalign(bdrv_opt_mem_align(bs), bytes); | |
3589 | memset(buf, 0, bytes); | |
3590 | qemu_iovec_init(&local_qiov, 1); | |
3591 | qemu_iovec_add(&local_qiov, buf, bytes); | |
d32f35cb | 3592 | |
fc3959e4 FZ |
3593 | ret = bdrv_co_do_writev(bs, sector_num, nb_sectors, &local_qiov, |
3594 | BDRV_REQ_ZERO_WRITE | flags); | |
3595 | qemu_vfree(buf); | |
3596 | } | |
3597 | return ret; | |
c5fbe571 SH |
3598 | } |
3599 | ||
83f64091 FB |
3600 | /** |
3601 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3602 | */ | |
3603 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3604 | { | |
3605 | BlockDriver *drv = bs->drv; | |
51762288 | 3606 | int ret; |
83f64091 | 3607 | if (!drv) |
19cb3738 | 3608 | return -ENOMEDIUM; |
83f64091 FB |
3609 | if (!drv->bdrv_truncate) |
3610 | return -ENOTSUP; | |
59f2689d NS |
3611 | if (bs->read_only) |
3612 | return -EACCES; | |
9c75e168 | 3613 | |
51762288 SH |
3614 | ret = drv->bdrv_truncate(bs, offset); |
3615 | if (ret == 0) { | |
3616 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
ce1ffea8 | 3617 | bdrv_dirty_bitmap_truncate(bs); |
a7f53e26 MA |
3618 | if (bs->blk) { |
3619 | blk_dev_resize_cb(bs->blk); | |
3620 | } | |
51762288 SH |
3621 | } |
3622 | return ret; | |
83f64091 FB |
3623 | } |
3624 | ||
4a1d5e1f FZ |
3625 | /** |
3626 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3627 | * allocated space. Return < 0 if error or unknown. | |
3628 | */ | |
3629 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3630 | { | |
3631 | BlockDriver *drv = bs->drv; | |
3632 | if (!drv) { | |
3633 | return -ENOMEDIUM; | |
3634 | } | |
3635 | if (drv->bdrv_get_allocated_file_size) { | |
3636 | return drv->bdrv_get_allocated_file_size(bs); | |
3637 | } | |
3638 | if (bs->file) { | |
3639 | return bdrv_get_allocated_file_size(bs->file); | |
3640 | } | |
3641 | return -ENOTSUP; | |
3642 | } | |
3643 | ||
83f64091 | 3644 | /** |
65a9bb25 | 3645 | * Return number of sectors on success, -errno on error. |
83f64091 | 3646 | */ |
65a9bb25 | 3647 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
83f64091 FB |
3648 | { |
3649 | BlockDriver *drv = bs->drv; | |
65a9bb25 | 3650 | |
83f64091 | 3651 | if (!drv) |
19cb3738 | 3652 | return -ENOMEDIUM; |
51762288 | 3653 | |
b94a2610 KW |
3654 | if (drv->has_variable_length) { |
3655 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3656 | if (ret < 0) { | |
3657 | return ret; | |
46a4e4e6 | 3658 | } |
83f64091 | 3659 | } |
65a9bb25 MA |
3660 | return bs->total_sectors; |
3661 | } | |
3662 | ||
3663 | /** | |
3664 | * Return length in bytes on success, -errno on error. | |
3665 | * The length is always a multiple of BDRV_SECTOR_SIZE. | |
3666 | */ | |
3667 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3668 | { | |
3669 | int64_t ret = bdrv_nb_sectors(bs); | |
3670 | ||
3671 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; | |
fc01f7e7 FB |
3672 | } |
3673 | ||
19cb3738 | 3674 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3675 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3676 | { |
65a9bb25 MA |
3677 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
3678 | ||
3679 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; | |
fc01f7e7 | 3680 | } |
cf98951b | 3681 | |
ff06f5f3 PB |
3682 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3683 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3684 | { |
3685 | bs->on_read_error = on_read_error; | |
3686 | bs->on_write_error = on_write_error; | |
3687 | } | |
3688 | ||
1ceee0d5 | 3689 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3690 | { |
3691 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3692 | } | |
3693 | ||
3e1caa5f PB |
3694 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3695 | { | |
3696 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3697 | ||
3698 | switch (on_err) { | |
3699 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
3700 | return (error == ENOSPC) ? |
3701 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
3e1caa5f | 3702 | case BLOCKDEV_ON_ERROR_STOP: |
a589569f | 3703 | return BLOCK_ERROR_ACTION_STOP; |
3e1caa5f | 3704 | case BLOCKDEV_ON_ERROR_REPORT: |
a589569f | 3705 | return BLOCK_ERROR_ACTION_REPORT; |
3e1caa5f | 3706 | case BLOCKDEV_ON_ERROR_IGNORE: |
a589569f | 3707 | return BLOCK_ERROR_ACTION_IGNORE; |
3e1caa5f PB |
3708 | default: |
3709 | abort(); | |
3710 | } | |
3711 | } | |
3712 | ||
c7c2ff0c LC |
3713 | static void send_qmp_error_event(BlockDriverState *bs, |
3714 | BlockErrorAction action, | |
3715 | bool is_read, int error) | |
3716 | { | |
573742a5 | 3717 | IoOperationType optype; |
c7c2ff0c | 3718 | |
573742a5 PM |
3719 | optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; |
3720 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), optype, action, | |
c7c2ff0c | 3721 | bdrv_iostatus_is_enabled(bs), |
624ff573 LC |
3722 | error == ENOSPC, strerror(error), |
3723 | &error_abort); | |
c7c2ff0c LC |
3724 | } |
3725 | ||
3e1caa5f PB |
3726 | /* This is done by device models because, while the block layer knows |
3727 | * about the error, it does not know whether an operation comes from | |
3728 | * the device or the block layer (from a job, for example). | |
3729 | */ | |
3730 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3731 | bool is_read, int error) | |
3732 | { | |
3733 | assert(error >= 0); | |
2bd3bce8 | 3734 | |
a589569f | 3735 | if (action == BLOCK_ERROR_ACTION_STOP) { |
2bd3bce8 PB |
3736 | /* First set the iostatus, so that "info block" returns an iostatus |
3737 | * that matches the events raised so far (an additional error iostatus | |
3738 | * is fine, but not a lost one). | |
3739 | */ | |
3e1caa5f | 3740 | bdrv_iostatus_set_err(bs, error); |
2bd3bce8 PB |
3741 | |
3742 | /* Then raise the request to stop the VM and the event. | |
3743 | * qemu_system_vmstop_request_prepare has two effects. First, | |
3744 | * it ensures that the STOP event always comes after the | |
3745 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
3746 | * can observe the STOP event and do a "cont" before the STOP | |
3747 | * event is issued, the VM will not stop. In this case, vm_start() | |
3748 | * also ensures that the STOP/RESUME pair of events is emitted. | |
3749 | */ | |
3750 | qemu_system_vmstop_request_prepare(); | |
c7c2ff0c | 3751 | send_qmp_error_event(bs, action, is_read, error); |
2bd3bce8 PB |
3752 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
3753 | } else { | |
c7c2ff0c | 3754 | send_qmp_error_event(bs, action, is_read, error); |
3e1caa5f PB |
3755 | } |
3756 | } | |
3757 | ||
b338082b FB |
3758 | int bdrv_is_read_only(BlockDriverState *bs) |
3759 | { | |
3760 | return bs->read_only; | |
3761 | } | |
3762 | ||
985a03b0 TS |
3763 | int bdrv_is_sg(BlockDriverState *bs) |
3764 | { | |
3765 | return bs->sg; | |
3766 | } | |
3767 | ||
e900a7b7 CH |
3768 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3769 | { | |
3770 | return bs->enable_write_cache; | |
3771 | } | |
3772 | ||
425b0148 PB |
3773 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3774 | { | |
3775 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3776 | |
3777 | /* so a reopen() will preserve wce */ | |
3778 | if (wce) { | |
3779 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3780 | } else { | |
3781 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3782 | } | |
425b0148 PB |
3783 | } |
3784 | ||
ea2384d3 FB |
3785 | int bdrv_is_encrypted(BlockDriverState *bs) |
3786 | { | |
3787 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3788 | return 1; | |
3789 | return bs->encrypted; | |
3790 | } | |
3791 | ||
c0f4ce77 AL |
3792 | int bdrv_key_required(BlockDriverState *bs) |
3793 | { | |
3794 | BlockDriverState *backing_hd = bs->backing_hd; | |
3795 | ||
3796 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3797 | return 1; | |
3798 | return (bs->encrypted && !bs->valid_key); | |
3799 | } | |
3800 | ||
ea2384d3 FB |
3801 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3802 | { | |
3803 | int ret; | |
3804 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3805 | ret = bdrv_set_key(bs->backing_hd, key); | |
3806 | if (ret < 0) | |
3807 | return ret; | |
3808 | if (!bs->encrypted) | |
3809 | return 0; | |
3810 | } | |
fd04a2ae SH |
3811 | if (!bs->encrypted) { |
3812 | return -EINVAL; | |
3813 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3814 | return -ENOMEDIUM; | |
3815 | } | |
c0f4ce77 | 3816 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3817 | if (ret < 0) { |
3818 | bs->valid_key = 0; | |
3819 | } else if (!bs->valid_key) { | |
3820 | bs->valid_key = 1; | |
a7f53e26 MA |
3821 | if (bs->blk) { |
3822 | /* call the change callback now, we skipped it on open */ | |
3823 | blk_dev_change_media_cb(bs->blk, true); | |
3824 | } | |
bb5fc20f | 3825 | } |
c0f4ce77 | 3826 | return ret; |
ea2384d3 FB |
3827 | } |
3828 | ||
4d2855a3 MA |
3829 | /* |
3830 | * Provide an encryption key for @bs. | |
3831 | * If @key is non-null: | |
3832 | * If @bs is not encrypted, fail. | |
3833 | * Else if the key is invalid, fail. | |
3834 | * Else set @bs's key to @key, replacing the existing key, if any. | |
3835 | * If @key is null: | |
3836 | * If @bs is encrypted and still lacks a key, fail. | |
3837 | * Else do nothing. | |
3838 | * On failure, store an error object through @errp if non-null. | |
3839 | */ | |
3840 | void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp) | |
3841 | { | |
3842 | if (key) { | |
3843 | if (!bdrv_is_encrypted(bs)) { | |
81e5f78a AG |
3844 | error_setg(errp, "Node '%s' is not encrypted", |
3845 | bdrv_get_device_or_node_name(bs)); | |
4d2855a3 MA |
3846 | } else if (bdrv_set_key(bs, key) < 0) { |
3847 | error_set(errp, QERR_INVALID_PASSWORD); | |
3848 | } | |
3849 | } else { | |
3850 | if (bdrv_key_required(bs)) { | |
b1ca6391 MA |
3851 | error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED, |
3852 | "'%s' (%s) is encrypted", | |
81e5f78a | 3853 | bdrv_get_device_or_node_name(bs), |
4d2855a3 MA |
3854 | bdrv_get_encrypted_filename(bs)); |
3855 | } | |
3856 | } | |
3857 | } | |
3858 | ||
f8d6bba1 | 3859 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3860 | { |
f8d6bba1 | 3861 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3862 | } |
3863 | ||
ada42401 SH |
3864 | static int qsort_strcmp(const void *a, const void *b) |
3865 | { | |
3866 | return strcmp(a, b); | |
3867 | } | |
3868 | ||
5fafdf24 | 3869 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3870 | void *opaque) |
3871 | { | |
3872 | BlockDriver *drv; | |
e855e4fb | 3873 | int count = 0; |
ada42401 | 3874 | int i; |
e855e4fb | 3875 | const char **formats = NULL; |
ea2384d3 | 3876 | |
8a22f02a | 3877 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
e855e4fb JC |
3878 | if (drv->format_name) { |
3879 | bool found = false; | |
3880 | int i = count; | |
3881 | while (formats && i && !found) { | |
3882 | found = !strcmp(formats[--i], drv->format_name); | |
3883 | } | |
3884 | ||
3885 | if (!found) { | |
5839e53b | 3886 | formats = g_renew(const char *, formats, count + 1); |
e855e4fb | 3887 | formats[count++] = drv->format_name; |
e855e4fb JC |
3888 | } |
3889 | } | |
ea2384d3 | 3890 | } |
ada42401 SH |
3891 | |
3892 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); | |
3893 | ||
3894 | for (i = 0; i < count; i++) { | |
3895 | it(opaque, formats[i]); | |
3896 | } | |
3897 | ||
e855e4fb | 3898 | g_free(formats); |
ea2384d3 FB |
3899 | } |
3900 | ||
dc364f4c BC |
3901 | /* This function is to find a node in the bs graph */ |
3902 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3903 | { | |
3904 | BlockDriverState *bs; | |
3905 | ||
3906 | assert(node_name); | |
3907 | ||
3908 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3909 | if (!strcmp(node_name, bs->node_name)) { | |
3910 | return bs; | |
3911 | } | |
3912 | } | |
3913 | return NULL; | |
3914 | } | |
3915 | ||
c13163fb | 3916 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
d5a8ee60 | 3917 | BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp) |
c13163fb BC |
3918 | { |
3919 | BlockDeviceInfoList *list, *entry; | |
3920 | BlockDriverState *bs; | |
3921 | ||
3922 | list = NULL; | |
3923 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
d5a8ee60 AG |
3924 | BlockDeviceInfo *info = bdrv_block_device_info(bs, errp); |
3925 | if (!info) { | |
3926 | qapi_free_BlockDeviceInfoList(list); | |
3927 | return NULL; | |
3928 | } | |
c13163fb | 3929 | entry = g_malloc0(sizeof(*entry)); |
d5a8ee60 | 3930 | entry->value = info; |
c13163fb BC |
3931 | entry->next = list; |
3932 | list = entry; | |
3933 | } | |
3934 | ||
3935 | return list; | |
3936 | } | |
3937 | ||
12d3ba82 BC |
3938 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3939 | const char *node_name, | |
3940 | Error **errp) | |
3941 | { | |
7f06d47e MA |
3942 | BlockBackend *blk; |
3943 | BlockDriverState *bs; | |
12d3ba82 | 3944 | |
12d3ba82 | 3945 | if (device) { |
7f06d47e | 3946 | blk = blk_by_name(device); |
12d3ba82 | 3947 | |
7f06d47e MA |
3948 | if (blk) { |
3949 | return blk_bs(blk); | |
12d3ba82 | 3950 | } |
12d3ba82 BC |
3951 | } |
3952 | ||
dd67fa50 BC |
3953 | if (node_name) { |
3954 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3955 | |
dd67fa50 BC |
3956 | if (bs) { |
3957 | return bs; | |
3958 | } | |
12d3ba82 BC |
3959 | } |
3960 | ||
dd67fa50 BC |
3961 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3962 | device ? device : "", | |
3963 | node_name ? node_name : ""); | |
3964 | return NULL; | |
12d3ba82 BC |
3965 | } |
3966 | ||
5a6684d2 JC |
3967 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
3968 | * return false. If either argument is NULL, return false. */ | |
3969 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
3970 | { | |
3971 | while (top && top != base) { | |
3972 | top = top->backing_hd; | |
3973 | } | |
3974 | ||
3975 | return top != NULL; | |
3976 | } | |
3977 | ||
04df765a FZ |
3978 | BlockDriverState *bdrv_next_node(BlockDriverState *bs) |
3979 | { | |
3980 | if (!bs) { | |
3981 | return QTAILQ_FIRST(&graph_bdrv_states); | |
3982 | } | |
3983 | return QTAILQ_NEXT(bs, node_list); | |
3984 | } | |
3985 | ||
2f399b0a MA |
3986 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3987 | { | |
3988 | if (!bs) { | |
3989 | return QTAILQ_FIRST(&bdrv_states); | |
3990 | } | |
dc364f4c | 3991 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3992 | } |
3993 | ||
20a9e77d FZ |
3994 | const char *bdrv_get_node_name(const BlockDriverState *bs) |
3995 | { | |
3996 | return bs->node_name; | |
3997 | } | |
3998 | ||
7f06d47e | 3999 | /* TODO check what callers really want: bs->node_name or blk_name() */ |
bfb197e0 | 4000 | const char *bdrv_get_device_name(const BlockDriverState *bs) |
ea2384d3 | 4001 | { |
bfb197e0 | 4002 | return bs->blk ? blk_name(bs->blk) : ""; |
ea2384d3 FB |
4003 | } |
4004 | ||
9b2aa84f AG |
4005 | /* This can be used to identify nodes that might not have a device |
4006 | * name associated. Since node and device names live in the same | |
4007 | * namespace, the result is unambiguous. The exception is if both are | |
4008 | * absent, then this returns an empty (non-null) string. */ | |
4009 | const char *bdrv_get_device_or_node_name(const BlockDriverState *bs) | |
4010 | { | |
4011 | return bs->blk ? blk_name(bs->blk) : bs->node_name; | |
4012 | } | |
4013 | ||
c8433287 MA |
4014 | int bdrv_get_flags(BlockDriverState *bs) |
4015 | { | |
4016 | return bs->open_flags; | |
4017 | } | |
4018 | ||
f0f0fdfe | 4019 | int bdrv_flush_all(void) |
c6ca28d6 | 4020 | { |
4f5472cb | 4021 | BlockDriverState *bs = NULL; |
f0f0fdfe | 4022 | int result = 0; |
c6ca28d6 | 4023 | |
4f5472cb | 4024 | while ((bs = bdrv_next(bs))) { |
ed78cda3 SH |
4025 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4026 | int ret; | |
4027 | ||
4028 | aio_context_acquire(aio_context); | |
4029 | ret = bdrv_flush(bs); | |
f0f0fdfe KW |
4030 | if (ret < 0 && !result) { |
4031 | result = ret; | |
4032 | } | |
ed78cda3 | 4033 | aio_context_release(aio_context); |
1b7bdbc1 | 4034 | } |
f0f0fdfe KW |
4035 | |
4036 | return result; | |
c6ca28d6 AL |
4037 | } |
4038 | ||
3ac21627 PL |
4039 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
4040 | { | |
4041 | return 1; | |
4042 | } | |
4043 | ||
f2feebbd KW |
4044 | int bdrv_has_zero_init(BlockDriverState *bs) |
4045 | { | |
4046 | assert(bs->drv); | |
4047 | ||
11212d8f PB |
4048 | /* If BS is a copy on write image, it is initialized to |
4049 | the contents of the base image, which may not be zeroes. */ | |
4050 | if (bs->backing_hd) { | |
4051 | return 0; | |
4052 | } | |
336c1c12 KW |
4053 | if (bs->drv->bdrv_has_zero_init) { |
4054 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
4055 | } |
4056 | ||
3ac21627 PL |
4057 | /* safe default */ |
4058 | return 0; | |
f2feebbd KW |
4059 | } |
4060 | ||
4ce78691 PL |
4061 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
4062 | { | |
4063 | BlockDriverInfo bdi; | |
4064 | ||
4065 | if (bs->backing_hd) { | |
4066 | return false; | |
4067 | } | |
4068 | ||
4069 | if (bdrv_get_info(bs, &bdi) == 0) { | |
4070 | return bdi.unallocated_blocks_are_zero; | |
4071 | } | |
4072 | ||
4073 | return false; | |
4074 | } | |
4075 | ||
4076 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
4077 | { | |
4078 | BlockDriverInfo bdi; | |
4079 | ||
4080 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
4081 | return false; | |
4082 | } | |
4083 | ||
4084 | if (bdrv_get_info(bs, &bdi) == 0) { | |
4085 | return bdi.can_write_zeroes_with_unmap; | |
4086 | } | |
4087 | ||
4088 | return false; | |
4089 | } | |
4090 | ||
b6b8a333 | 4091 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 4092 | BlockDriverState *bs; |
b35b2bba | 4093 | BlockDriverState *base; |
376ae3f1 SH |
4094 | int64_t sector_num; |
4095 | int nb_sectors; | |
4096 | int *pnum; | |
b6b8a333 | 4097 | int64_t ret; |
376ae3f1 | 4098 | bool done; |
b6b8a333 | 4099 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 4100 | |
f58c7b35 | 4101 | /* |
705be728 FZ |
4102 | * Returns the allocation status of the specified sectors. |
4103 | * Drivers not implementing the functionality are assumed to not support | |
4104 | * backing files, hence all their sectors are reported as allocated. | |
f58c7b35 | 4105 | * |
bd9533e3 SH |
4106 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
4107 | * and 'pnum' is set to 0. | |
4108 | * | |
f58c7b35 TS |
4109 | * 'pnum' is set to the number of sectors (including and immediately following |
4110 | * the specified sector) that are known to be in the same | |
4111 | * allocated/unallocated state. | |
4112 | * | |
bd9533e3 SH |
4113 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
4114 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 4115 | */ |
b6b8a333 PB |
4116 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
4117 | int64_t sector_num, | |
4118 | int nb_sectors, int *pnum) | |
f58c7b35 | 4119 | { |
30a7f2fc | 4120 | int64_t total_sectors; |
bd9533e3 | 4121 | int64_t n; |
5daa74a6 | 4122 | int64_t ret, ret2; |
bd9533e3 | 4123 | |
30a7f2fc MA |
4124 | total_sectors = bdrv_nb_sectors(bs); |
4125 | if (total_sectors < 0) { | |
4126 | return total_sectors; | |
617ccb46 PB |
4127 | } |
4128 | ||
30a7f2fc | 4129 | if (sector_num >= total_sectors) { |
bd9533e3 SH |
4130 | *pnum = 0; |
4131 | return 0; | |
4132 | } | |
4133 | ||
30a7f2fc | 4134 | n = total_sectors - sector_num; |
bd9533e3 SH |
4135 | if (n < nb_sectors) { |
4136 | nb_sectors = n; | |
4137 | } | |
4138 | ||
b6b8a333 | 4139 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 4140 | *pnum = nb_sectors; |
e88ae226 | 4141 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
918e92d7 PB |
4142 | if (bs->drv->protocol_name) { |
4143 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
4144 | } | |
4145 | return ret; | |
f58c7b35 | 4146 | } |
6aebab14 | 4147 | |
415b5b01 PB |
4148 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
4149 | if (ret < 0) { | |
3e0a233d | 4150 | *pnum = 0; |
415b5b01 PB |
4151 | return ret; |
4152 | } | |
4153 | ||
92bc50a5 PL |
4154 | if (ret & BDRV_BLOCK_RAW) { |
4155 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
4156 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
4157 | *pnum, pnum); | |
4158 | } | |
4159 | ||
e88ae226 KW |
4160 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
4161 | ret |= BDRV_BLOCK_ALLOCATED; | |
4162 | } | |
4163 | ||
c3d86884 PL |
4164 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
4165 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 4166 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 4167 | } else if (bs->backing_hd) { |
f0ad5712 | 4168 | BlockDriverState *bs2 = bs->backing_hd; |
30a7f2fc MA |
4169 | int64_t nb_sectors2 = bdrv_nb_sectors(bs2); |
4170 | if (nb_sectors2 >= 0 && sector_num >= nb_sectors2) { | |
f0ad5712 PB |
4171 | ret |= BDRV_BLOCK_ZERO; |
4172 | } | |
4173 | } | |
415b5b01 | 4174 | } |
5daa74a6 PB |
4175 | |
4176 | if (bs->file && | |
4177 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
4178 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
59c9a95f HR |
4179 | int file_pnum; |
4180 | ||
5daa74a6 | 4181 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
59c9a95f | 4182 | *pnum, &file_pnum); |
5daa74a6 PB |
4183 | if (ret2 >= 0) { |
4184 | /* Ignore errors. This is just providing extra information, it | |
4185 | * is useful but not necessary. | |
4186 | */ | |
59c9a95f HR |
4187 | if (!file_pnum) { |
4188 | /* !file_pnum indicates an offset at or beyond the EOF; it is | |
4189 | * perfectly valid for the format block driver to point to such | |
4190 | * offsets, so catch it and mark everything as zero */ | |
4191 | ret |= BDRV_BLOCK_ZERO; | |
4192 | } else { | |
4193 | /* Limit request to the range reported by the protocol driver */ | |
4194 | *pnum = file_pnum; | |
4195 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
4196 | } | |
5daa74a6 PB |
4197 | } |
4198 | } | |
4199 | ||
415b5b01 | 4200 | return ret; |
060f51c9 SH |
4201 | } |
4202 | ||
b6b8a333 PB |
4203 | /* Coroutine wrapper for bdrv_get_block_status() */ |
4204 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 4205 | { |
b6b8a333 | 4206 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
4207 | BlockDriverState *bs = data->bs; |
4208 | ||
b6b8a333 PB |
4209 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
4210 | data->pnum); | |
060f51c9 SH |
4211 | data->done = true; |
4212 | } | |
4213 | ||
4214 | /* | |
b6b8a333 | 4215 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 4216 | * |
b6b8a333 | 4217 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 4218 | */ |
b6b8a333 PB |
4219 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
4220 | int nb_sectors, int *pnum) | |
060f51c9 | 4221 | { |
6aebab14 | 4222 | Coroutine *co; |
b6b8a333 | 4223 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
4224 | .bs = bs, |
4225 | .sector_num = sector_num, | |
4226 | .nb_sectors = nb_sectors, | |
4227 | .pnum = pnum, | |
4228 | .done = false, | |
4229 | }; | |
4230 | ||
bdad13b9 PB |
4231 | if (qemu_in_coroutine()) { |
4232 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 4233 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 4234 | } else { |
2572b37a SH |
4235 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4236 | ||
b6b8a333 | 4237 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
4238 | qemu_coroutine_enter(co, &data); |
4239 | while (!data.done) { | |
2572b37a | 4240 | aio_poll(aio_context, true); |
bdad13b9 | 4241 | } |
6aebab14 SH |
4242 | } |
4243 | return data.ret; | |
f58c7b35 TS |
4244 | } |
4245 | ||
b6b8a333 PB |
4246 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
4247 | int nb_sectors, int *pnum) | |
4248 | { | |
4333bb71 PB |
4249 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
4250 | if (ret < 0) { | |
4251 | return ret; | |
4252 | } | |
01fb2705 | 4253 | return !!(ret & BDRV_BLOCK_ALLOCATED); |
b6b8a333 PB |
4254 | } |
4255 | ||
188a7bbf PB |
4256 | /* |
4257 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
4258 | * | |
4259 | * Return true if the given sector is allocated in any image between | |
4260 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
4261 | * sector is allocated in any image of the chain. Return false otherwise. | |
4262 | * | |
4263 | * 'pnum' is set to the number of sectors (including and immediately following | |
4264 | * the specified sector) that are known to be in the same | |
4265 | * allocated/unallocated state. | |
4266 | * | |
4267 | */ | |
4f578637 PB |
4268 | int bdrv_is_allocated_above(BlockDriverState *top, |
4269 | BlockDriverState *base, | |
4270 | int64_t sector_num, | |
4271 | int nb_sectors, int *pnum) | |
188a7bbf PB |
4272 | { |
4273 | BlockDriverState *intermediate; | |
4274 | int ret, n = nb_sectors; | |
4275 | ||
4276 | intermediate = top; | |
4277 | while (intermediate && intermediate != base) { | |
4278 | int pnum_inter; | |
bdad13b9 PB |
4279 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
4280 | &pnum_inter); | |
188a7bbf PB |
4281 | if (ret < 0) { |
4282 | return ret; | |
4283 | } else if (ret) { | |
4284 | *pnum = pnum_inter; | |
4285 | return 1; | |
4286 | } | |
4287 | ||
4288 | /* | |
4289 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
4290 | * might have | |
4291 | * | |
4292 | * [sector_num+x, nr_sectors] allocated. | |
4293 | */ | |
63ba17d3 VI |
4294 | if (n > pnum_inter && |
4295 | (intermediate == top || | |
4296 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
4297 | n = pnum_inter; |
4298 | } | |
4299 | ||
4300 | intermediate = intermediate->backing_hd; | |
4301 | } | |
4302 | ||
4303 | *pnum = n; | |
4304 | return 0; | |
4305 | } | |
4306 | ||
045df330 AL |
4307 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
4308 | { | |
4309 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
4310 | return bs->backing_file; | |
4311 | else if (bs->encrypted) | |
4312 | return bs->filename; | |
4313 | else | |
4314 | return NULL; | |
4315 | } | |
4316 | ||
5fafdf24 | 4317 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
4318 | char *filename, int filename_size) |
4319 | { | |
3574c608 | 4320 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
4321 | } |
4322 | ||
5fafdf24 | 4323 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
4324 | const uint8_t *buf, int nb_sectors) |
4325 | { | |
4326 | BlockDriver *drv = bs->drv; | |
b9c64947 HR |
4327 | int ret; |
4328 | ||
4329 | if (!drv) { | |
19cb3738 | 4330 | return -ENOMEDIUM; |
b9c64947 HR |
4331 | } |
4332 | if (!drv->bdrv_write_compressed) { | |
faea38e7 | 4333 | return -ENOTSUP; |
b9c64947 HR |
4334 | } |
4335 | ret = bdrv_check_request(bs, sector_num, nb_sectors); | |
4336 | if (ret < 0) { | |
4337 | return ret; | |
4338 | } | |
a55eb92c | 4339 | |
e4654d2d | 4340 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 4341 | |
faea38e7 FB |
4342 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
4343 | } | |
3b46e624 | 4344 | |
faea38e7 FB |
4345 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
4346 | { | |
4347 | BlockDriver *drv = bs->drv; | |
4348 | if (!drv) | |
19cb3738 | 4349 | return -ENOMEDIUM; |
faea38e7 FB |
4350 | if (!drv->bdrv_get_info) |
4351 | return -ENOTSUP; | |
4352 | memset(bdi, 0, sizeof(*bdi)); | |
4353 | return drv->bdrv_get_info(bs, bdi); | |
4354 | } | |
4355 | ||
eae041fe HR |
4356 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
4357 | { | |
4358 | BlockDriver *drv = bs->drv; | |
4359 | if (drv && drv->bdrv_get_specific_info) { | |
4360 | return drv->bdrv_get_specific_info(bs); | |
4361 | } | |
4362 | return NULL; | |
4363 | } | |
4364 | ||
45566e9c CH |
4365 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
4366 | int64_t pos, int size) | |
cf8074b3 KW |
4367 | { |
4368 | QEMUIOVector qiov; | |
4369 | struct iovec iov = { | |
4370 | .iov_base = (void *) buf, | |
4371 | .iov_len = size, | |
4372 | }; | |
4373 | ||
4374 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4375 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
4376 | } | |
4377 | ||
4378 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4379 | { |
4380 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4381 | |
4382 | if (!drv) { | |
178e08a5 | 4383 | return -ENOMEDIUM; |
cf8074b3 KW |
4384 | } else if (drv->bdrv_save_vmstate) { |
4385 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4386 | } else if (bs->file) { | |
4387 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4388 | } | |
4389 | ||
7cdb1f6d | 4390 | return -ENOTSUP; |
178e08a5 AL |
4391 | } |
4392 | ||
45566e9c CH |
4393 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4394 | int64_t pos, int size) | |
178e08a5 AL |
4395 | { |
4396 | BlockDriver *drv = bs->drv; | |
4397 | if (!drv) | |
4398 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4399 | if (drv->bdrv_load_vmstate) |
4400 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4401 | if (bs->file) | |
4402 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4403 | return -ENOTSUP; | |
178e08a5 AL |
4404 | } |
4405 | ||
8b9b0cc2 KW |
4406 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4407 | { | |
bf736fe3 | 4408 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4409 | return; |
4410 | } | |
4411 | ||
bf736fe3 | 4412 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4413 | } |
4414 | ||
4415 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4416 | const char *tag) | |
4417 | { | |
4418 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4419 | bs = bs->file; | |
4420 | } | |
4421 | ||
4422 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4423 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4424 | } | |
4425 | ||
4426 | return -ENOTSUP; | |
4427 | } | |
4428 | ||
4cc70e93 FZ |
4429 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4430 | { | |
4431 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4432 | bs = bs->file; | |
4433 | } | |
4434 | ||
4435 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4436 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4437 | } | |
4438 | ||
4439 | return -ENOTSUP; | |
4440 | } | |
4441 | ||
41c695c7 KW |
4442 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4443 | { | |
938789ea | 4444 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
41c695c7 KW |
4445 | bs = bs->file; |
4446 | } | |
8b9b0cc2 | 4447 | |
41c695c7 KW |
4448 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4449 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4450 | } | |
4451 | ||
4452 | return -ENOTSUP; | |
4453 | } | |
4454 | ||
4455 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4456 | { | |
4457 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4458 | bs = bs->file; | |
4459 | } | |
4460 | ||
4461 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4462 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4463 | } | |
4464 | ||
4465 | return false; | |
8b9b0cc2 KW |
4466 | } |
4467 | ||
199630b6 BS |
4468 | int bdrv_is_snapshot(BlockDriverState *bs) |
4469 | { | |
4470 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4471 | } | |
4472 | ||
b1b1d783 JC |
4473 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4474 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4475 | * from a BDS as backing_file should not be done, as that may be relative to | |
4476 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4477 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4478 | const char *backing_file) | |
4479 | { | |
b1b1d783 JC |
4480 | char *filename_full = NULL; |
4481 | char *backing_file_full = NULL; | |
4482 | char *filename_tmp = NULL; | |
4483 | int is_protocol = 0; | |
4484 | BlockDriverState *curr_bs = NULL; | |
4485 | BlockDriverState *retval = NULL; | |
4486 | ||
4487 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4488 | return NULL; |
4489 | } | |
4490 | ||
b1b1d783 JC |
4491 | filename_full = g_malloc(PATH_MAX); |
4492 | backing_file_full = g_malloc(PATH_MAX); | |
4493 | filename_tmp = g_malloc(PATH_MAX); | |
4494 | ||
4495 | is_protocol = path_has_protocol(backing_file); | |
4496 | ||
4497 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4498 | ||
4499 | /* If either of the filename paths is actually a protocol, then | |
4500 | * compare unmodified paths; otherwise make paths relative */ | |
4501 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4502 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4503 | retval = curr_bs->backing_hd; | |
4504 | break; | |
4505 | } | |
e8a6bb9c | 4506 | } else { |
b1b1d783 JC |
4507 | /* If not an absolute filename path, make it relative to the current |
4508 | * image's filename path */ | |
4509 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4510 | backing_file); | |
4511 | ||
4512 | /* We are going to compare absolute pathnames */ | |
4513 | if (!realpath(filename_tmp, filename_full)) { | |
4514 | continue; | |
4515 | } | |
4516 | ||
4517 | /* We need to make sure the backing filename we are comparing against | |
4518 | * is relative to the current image filename (or absolute) */ | |
4519 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4520 | curr_bs->backing_file); | |
4521 | ||
4522 | if (!realpath(filename_tmp, backing_file_full)) { | |
4523 | continue; | |
4524 | } | |
4525 | ||
4526 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4527 | retval = curr_bs->backing_hd; | |
4528 | break; | |
4529 | } | |
e8a6bb9c MT |
4530 | } |
4531 | } | |
4532 | ||
b1b1d783 JC |
4533 | g_free(filename_full); |
4534 | g_free(backing_file_full); | |
4535 | g_free(filename_tmp); | |
4536 | return retval; | |
e8a6bb9c MT |
4537 | } |
4538 | ||
f198fd1c BC |
4539 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4540 | { | |
4541 | if (!bs->drv) { | |
4542 | return 0; | |
4543 | } | |
4544 | ||
4545 | if (!bs->backing_hd) { | |
4546 | return 0; | |
4547 | } | |
4548 | ||
4549 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4550 | } | |
4551 | ||
ea2384d3 | 4552 | /**************************************************************/ |
83f64091 | 4553 | /* async I/Os */ |
ea2384d3 | 4554 | |
7c84b1b8 MA |
4555 | BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
4556 | QEMUIOVector *qiov, int nb_sectors, | |
097310b5 | 4557 | BlockCompletionFunc *cb, void *opaque) |
83f64091 | 4558 | { |
bbf0a440 SH |
4559 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4560 | ||
d20d9b7c | 4561 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4562 | cb, opaque, false); |
ea2384d3 FB |
4563 | } |
4564 | ||
7c84b1b8 MA |
4565 | BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4566 | QEMUIOVector *qiov, int nb_sectors, | |
097310b5 | 4567 | BlockCompletionFunc *cb, void *opaque) |
ea2384d3 | 4568 | { |
bbf0a440 SH |
4569 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4570 | ||
d20d9b7c | 4571 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4572 | cb, opaque, true); |
83f64091 FB |
4573 | } |
4574 | ||
7c84b1b8 | 4575 | BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
d5ef94d4 | 4576 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, |
097310b5 | 4577 | BlockCompletionFunc *cb, void *opaque) |
d5ef94d4 PB |
4578 | { |
4579 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4580 | ||
4581 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4582 | BDRV_REQ_ZERO_WRITE | flags, | |
4583 | cb, opaque, true); | |
4584 | } | |
4585 | ||
40b4f539 KW |
4586 | |
4587 | typedef struct MultiwriteCB { | |
4588 | int error; | |
4589 | int num_requests; | |
4590 | int num_callbacks; | |
4591 | struct { | |
097310b5 | 4592 | BlockCompletionFunc *cb; |
40b4f539 KW |
4593 | void *opaque; |
4594 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4595 | } callbacks[]; |
4596 | } MultiwriteCB; | |
4597 | ||
4598 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4599 | { | |
4600 | int i; | |
4601 | ||
4602 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4603 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4604 | if (mcb->callbacks[i].free_qiov) { |
4605 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4606 | } | |
7267c094 | 4607 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4608 | } |
4609 | } | |
4610 | ||
4611 | static void multiwrite_cb(void *opaque, int ret) | |
4612 | { | |
4613 | MultiwriteCB *mcb = opaque; | |
4614 | ||
6d519a5f SH |
4615 | trace_multiwrite_cb(mcb, ret); |
4616 | ||
cb6d3ca0 | 4617 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4618 | mcb->error = ret; |
40b4f539 KW |
4619 | } |
4620 | ||
4621 | mcb->num_requests--; | |
4622 | if (mcb->num_requests == 0) { | |
de189a1b | 4623 | multiwrite_user_cb(mcb); |
7267c094 | 4624 | g_free(mcb); |
40b4f539 KW |
4625 | } |
4626 | } | |
4627 | ||
4628 | static int multiwrite_req_compare(const void *a, const void *b) | |
4629 | { | |
77be4366 CH |
4630 | const BlockRequest *req1 = a, *req2 = b; |
4631 | ||
4632 | /* | |
4633 | * Note that we can't simply subtract req2->sector from req1->sector | |
4634 | * here as that could overflow the return value. | |
4635 | */ | |
4636 | if (req1->sector > req2->sector) { | |
4637 | return 1; | |
4638 | } else if (req1->sector < req2->sector) { | |
4639 | return -1; | |
4640 | } else { | |
4641 | return 0; | |
4642 | } | |
40b4f539 KW |
4643 | } |
4644 | ||
4645 | /* | |
4646 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4647 | * requests that remain after merging. | |
4648 | */ | |
4649 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4650 | int num_reqs, MultiwriteCB *mcb) | |
4651 | { | |
4652 | int i, outidx; | |
4653 | ||
4654 | // Sort requests by start sector | |
4655 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4656 | ||
4657 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4658 | // filling up gaps with zero sectors. | |
4659 | outidx = 0; | |
4660 | for (i = 1; i < num_reqs; i++) { | |
4661 | int merge = 0; | |
4662 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4663 | ||
b6a127a1 | 4664 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4665 | if (reqs[i].sector <= oldreq_last) { |
4666 | merge = 1; | |
4667 | } | |
4668 | ||
e2a305fb CH |
4669 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4670 | merge = 0; | |
4671 | } | |
4672 | ||
6c5a42ac PL |
4673 | if (bs->bl.max_transfer_length && reqs[outidx].nb_sectors + |
4674 | reqs[i].nb_sectors > bs->bl.max_transfer_length) { | |
4675 | merge = 0; | |
4676 | } | |
4677 | ||
40b4f539 KW |
4678 | if (merge) { |
4679 | size_t size; | |
7267c094 | 4680 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4681 | qemu_iovec_init(qiov, |
4682 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4683 | ||
4684 | // Add the first request to the merged one. If the requests are | |
4685 | // overlapping, drop the last sectors of the first request. | |
4686 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4687 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4688 | |
b6a127a1 PB |
4689 | // We should need to add any zeros between the two requests |
4690 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4691 | |
4692 | // Add the second request | |
1b093c48 | 4693 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4694 | |
391827eb SH |
4695 | // Add tail of first request, if necessary |
4696 | if (qiov->size < reqs[outidx].qiov->size) { | |
4697 | qemu_iovec_concat(qiov, reqs[outidx].qiov, qiov->size, | |
4698 | reqs[outidx].qiov->size - qiov->size); | |
4699 | } | |
4700 | ||
cbf1dff2 | 4701 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4702 | reqs[outidx].qiov = qiov; |
4703 | ||
4704 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4705 | } else { | |
4706 | outidx++; | |
4707 | reqs[outidx].sector = reqs[i].sector; | |
4708 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4709 | reqs[outidx].qiov = reqs[i].qiov; | |
4710 | } | |
4711 | } | |
4712 | ||
f4564d53 PL |
4713 | block_acct_merge_done(&bs->stats, BLOCK_ACCT_WRITE, num_reqs - outidx - 1); |
4714 | ||
40b4f539 KW |
4715 | return outidx + 1; |
4716 | } | |
4717 | ||
4718 | /* | |
4719 | * Submit multiple AIO write requests at once. | |
4720 | * | |
4721 | * On success, the function returns 0 and all requests in the reqs array have | |
4722 | * been submitted. In error case this function returns -1, and any of the | |
4723 | * requests may or may not be submitted yet. In particular, this means that the | |
4724 | * callback will be called for some of the requests, for others it won't. The | |
4725 | * caller must check the error field of the BlockRequest to wait for the right | |
4726 | * callbacks (if error != 0, no callback will be called). | |
4727 | * | |
4728 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4729 | * requests. However, the fields opaque and error are left unmodified as they | |
4730 | * are used to signal failure for a single request to the caller. | |
4731 | */ | |
4732 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4733 | { | |
40b4f539 KW |
4734 | MultiwriteCB *mcb; |
4735 | int i; | |
4736 | ||
301db7c2 RH |
4737 | /* don't submit writes if we don't have a medium */ |
4738 | if (bs->drv == NULL) { | |
4739 | for (i = 0; i < num_reqs; i++) { | |
4740 | reqs[i].error = -ENOMEDIUM; | |
4741 | } | |
4742 | return -1; | |
4743 | } | |
4744 | ||
40b4f539 KW |
4745 | if (num_reqs == 0) { |
4746 | return 0; | |
4747 | } | |
4748 | ||
4749 | // Create MultiwriteCB structure | |
7267c094 | 4750 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4751 | mcb->num_requests = 0; |
4752 | mcb->num_callbacks = num_reqs; | |
4753 | ||
4754 | for (i = 0; i < num_reqs; i++) { | |
4755 | mcb->callbacks[i].cb = reqs[i].cb; | |
4756 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4757 | } | |
4758 | ||
4759 | // Check for mergable requests | |
4760 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4761 | ||
6d519a5f SH |
4762 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4763 | ||
df9309fb PB |
4764 | /* Run the aio requests. */ |
4765 | mcb->num_requests = num_reqs; | |
40b4f539 | 4766 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4767 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4768 | reqs[i].nb_sectors, reqs[i].flags, | |
4769 | multiwrite_cb, mcb, | |
4770 | true); | |
40b4f539 KW |
4771 | } |
4772 | ||
4773 | return 0; | |
40b4f539 KW |
4774 | } |
4775 | ||
7c84b1b8 | 4776 | void bdrv_aio_cancel(BlockAIOCB *acb) |
83f64091 | 4777 | { |
ca5fd113 FZ |
4778 | qemu_aio_ref(acb); |
4779 | bdrv_aio_cancel_async(acb); | |
4780 | while (acb->refcnt > 1) { | |
4781 | if (acb->aiocb_info->get_aio_context) { | |
4782 | aio_poll(acb->aiocb_info->get_aio_context(acb), true); | |
4783 | } else if (acb->bs) { | |
4784 | aio_poll(bdrv_get_aio_context(acb->bs), true); | |
4785 | } else { | |
4786 | abort(); | |
02c50efe | 4787 | } |
02c50efe | 4788 | } |
8007429a | 4789 | qemu_aio_unref(acb); |
02c50efe FZ |
4790 | } |
4791 | ||
4792 | /* Async version of aio cancel. The caller is not blocked if the acb implements | |
4793 | * cancel_async, otherwise we do nothing and let the request normally complete. | |
4794 | * In either case the completion callback must be called. */ | |
7c84b1b8 | 4795 | void bdrv_aio_cancel_async(BlockAIOCB *acb) |
02c50efe FZ |
4796 | { |
4797 | if (acb->aiocb_info->cancel_async) { | |
4798 | acb->aiocb_info->cancel_async(acb); | |
4799 | } | |
83f64091 FB |
4800 | } |
4801 | ||
4802 | /**************************************************************/ | |
4803 | /* async block device emulation */ | |
4804 | ||
7c84b1b8 MA |
4805 | typedef struct BlockAIOCBSync { |
4806 | BlockAIOCB common; | |
c16b5a2c CH |
4807 | QEMUBH *bh; |
4808 | int ret; | |
4809 | /* vector translation state */ | |
4810 | QEMUIOVector *qiov; | |
4811 | uint8_t *bounce; | |
4812 | int is_write; | |
7c84b1b8 | 4813 | } BlockAIOCBSync; |
c16b5a2c | 4814 | |
d7331bed | 4815 | static const AIOCBInfo bdrv_em_aiocb_info = { |
7c84b1b8 | 4816 | .aiocb_size = sizeof(BlockAIOCBSync), |
c16b5a2c CH |
4817 | }; |
4818 | ||
ce1a14dc | 4819 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4820 | { |
7c84b1b8 | 4821 | BlockAIOCBSync *acb = opaque; |
f141eafe | 4822 | |
857d4f46 | 4823 | if (!acb->is_write && acb->ret >= 0) { |
03396148 | 4824 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
857d4f46 | 4825 | } |
ceb42de8 | 4826 | qemu_vfree(acb->bounce); |
ce1a14dc | 4827 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4828 | qemu_bh_delete(acb->bh); |
36afc451 | 4829 | acb->bh = NULL; |
8007429a | 4830 | qemu_aio_unref(acb); |
83f64091 | 4831 | } |
beac80cd | 4832 | |
7c84b1b8 MA |
4833 | static BlockAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4834 | int64_t sector_num, | |
4835 | QEMUIOVector *qiov, | |
4836 | int nb_sectors, | |
097310b5 | 4837 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
4838 | void *opaque, |
4839 | int is_write) | |
f141eafe | 4840 | |
83f64091 | 4841 | { |
7c84b1b8 | 4842 | BlockAIOCBSync *acb; |
ce1a14dc | 4843 | |
d7331bed | 4844 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4845 | acb->is_write = is_write; |
4846 | acb->qiov = qiov; | |
857d4f46 | 4847 | acb->bounce = qemu_try_blockalign(bs, qiov->size); |
2572b37a | 4848 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
f141eafe | 4849 | |
857d4f46 KW |
4850 | if (acb->bounce == NULL) { |
4851 | acb->ret = -ENOMEM; | |
4852 | } else if (is_write) { | |
d5e6b161 | 4853 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4854 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4855 | } else { |
1ed20acf | 4856 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4857 | } |
4858 | ||
ce1a14dc | 4859 | qemu_bh_schedule(acb->bh); |
f141eafe | 4860 | |
ce1a14dc | 4861 | return &acb->common; |
beac80cd FB |
4862 | } |
4863 | ||
7c84b1b8 | 4864 | static BlockAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
f141eafe | 4865 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 4866 | BlockCompletionFunc *cb, void *opaque) |
beac80cd | 4867 | { |
f141eafe AL |
4868 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4869 | } | |
83f64091 | 4870 | |
7c84b1b8 | 4871 | static BlockAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
f141eafe | 4872 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
097310b5 | 4873 | BlockCompletionFunc *cb, void *opaque) |
f141eafe AL |
4874 | { |
4875 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4876 | } |
beac80cd | 4877 | |
68485420 | 4878 | |
7c84b1b8 MA |
4879 | typedef struct BlockAIOCBCoroutine { |
4880 | BlockAIOCB common; | |
68485420 KW |
4881 | BlockRequest req; |
4882 | bool is_write; | |
0b5a2445 | 4883 | bool need_bh; |
d318aea9 | 4884 | bool *done; |
68485420 | 4885 | QEMUBH* bh; |
7c84b1b8 | 4886 | } BlockAIOCBCoroutine; |
68485420 | 4887 | |
d7331bed | 4888 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
7c84b1b8 | 4889 | .aiocb_size = sizeof(BlockAIOCBCoroutine), |
68485420 KW |
4890 | }; |
4891 | ||
0b5a2445 PB |
4892 | static void bdrv_co_complete(BlockAIOCBCoroutine *acb) |
4893 | { | |
4894 | if (!acb->need_bh) { | |
4895 | acb->common.cb(acb->common.opaque, acb->req.error); | |
4896 | qemu_aio_unref(acb); | |
4897 | } | |
4898 | } | |
4899 | ||
35246a68 | 4900 | static void bdrv_co_em_bh(void *opaque) |
68485420 | 4901 | { |
7c84b1b8 | 4902 | BlockAIOCBCoroutine *acb = opaque; |
68485420 | 4903 | |
0b5a2445 | 4904 | assert(!acb->need_bh); |
68485420 | 4905 | qemu_bh_delete(acb->bh); |
0b5a2445 PB |
4906 | bdrv_co_complete(acb); |
4907 | } | |
4908 | ||
4909 | static void bdrv_co_maybe_schedule_bh(BlockAIOCBCoroutine *acb) | |
4910 | { | |
4911 | acb->need_bh = false; | |
4912 | if (acb->req.error != -EINPROGRESS) { | |
4913 | BlockDriverState *bs = acb->common.bs; | |
4914 | ||
4915 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); | |
4916 | qemu_bh_schedule(acb->bh); | |
4917 | } | |
68485420 KW |
4918 | } |
4919 | ||
b2a61371 SH |
4920 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4921 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4922 | { | |
7c84b1b8 | 4923 | BlockAIOCBCoroutine *acb = opaque; |
b2a61371 SH |
4924 | BlockDriverState *bs = acb->common.bs; |
4925 | ||
4926 | if (!acb->is_write) { | |
4927 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4928 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4929 | } else { |
4930 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4931 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4932 | } |
4933 | ||
0b5a2445 | 4934 | bdrv_co_complete(acb); |
b2a61371 SH |
4935 | } |
4936 | ||
7c84b1b8 MA |
4937 | static BlockAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4938 | int64_t sector_num, | |
4939 | QEMUIOVector *qiov, | |
4940 | int nb_sectors, | |
4941 | BdrvRequestFlags flags, | |
097310b5 | 4942 | BlockCompletionFunc *cb, |
7c84b1b8 MA |
4943 | void *opaque, |
4944 | bool is_write) | |
68485420 KW |
4945 | { |
4946 | Coroutine *co; | |
7c84b1b8 | 4947 | BlockAIOCBCoroutine *acb; |
68485420 | 4948 | |
d7331bed | 4949 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
0b5a2445 PB |
4950 | acb->need_bh = true; |
4951 | acb->req.error = -EINPROGRESS; | |
68485420 KW |
4952 | acb->req.sector = sector_num; |
4953 | acb->req.nb_sectors = nb_sectors; | |
4954 | acb->req.qiov = qiov; | |
d20d9b7c | 4955 | acb->req.flags = flags; |
68485420 KW |
4956 | acb->is_write = is_write; |
4957 | ||
8c5873d6 | 4958 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4959 | qemu_coroutine_enter(co, acb); |
4960 | ||
0b5a2445 | 4961 | bdrv_co_maybe_schedule_bh(acb); |
68485420 KW |
4962 | return &acb->common; |
4963 | } | |
4964 | ||
07f07615 | 4965 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4966 | { |
7c84b1b8 | 4967 | BlockAIOCBCoroutine *acb = opaque; |
07f07615 | 4968 | BlockDriverState *bs = acb->common.bs; |
b2e12bc6 | 4969 | |
07f07615 | 4970 | acb->req.error = bdrv_co_flush(bs); |
0b5a2445 | 4971 | bdrv_co_complete(acb); |
b2e12bc6 CH |
4972 | } |
4973 | ||
7c84b1b8 | 4974 | BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
097310b5 | 4975 | BlockCompletionFunc *cb, void *opaque) |
016f5cf6 | 4976 | { |
07f07615 | 4977 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4978 | |
07f07615 | 4979 | Coroutine *co; |
7c84b1b8 | 4980 | BlockAIOCBCoroutine *acb; |
016f5cf6 | 4981 | |
d7331bed | 4982 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
0b5a2445 PB |
4983 | acb->need_bh = true; |
4984 | acb->req.error = -EINPROGRESS; | |
d318aea9 | 4985 | |
07f07615 PB |
4986 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4987 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4988 | |
0b5a2445 | 4989 | bdrv_co_maybe_schedule_bh(acb); |
016f5cf6 AG |
4990 | return &acb->common; |
4991 | } | |
4992 | ||
4265d620 PB |
4993 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4994 | { | |
7c84b1b8 | 4995 | BlockAIOCBCoroutine *acb = opaque; |
4265d620 PB |
4996 | BlockDriverState *bs = acb->common.bs; |
4997 | ||
4998 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
0b5a2445 | 4999 | bdrv_co_complete(acb); |
4265d620 PB |
5000 | } |
5001 | ||
7c84b1b8 | 5002 | BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
4265d620 | 5003 | int64_t sector_num, int nb_sectors, |
097310b5 | 5004 | BlockCompletionFunc *cb, void *opaque) |
4265d620 PB |
5005 | { |
5006 | Coroutine *co; | |
7c84b1b8 | 5007 | BlockAIOCBCoroutine *acb; |
4265d620 PB |
5008 | |
5009 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
5010 | ||
d7331bed | 5011 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
0b5a2445 PB |
5012 | acb->need_bh = true; |
5013 | acb->req.error = -EINPROGRESS; | |
4265d620 PB |
5014 | acb->req.sector = sector_num; |
5015 | acb->req.nb_sectors = nb_sectors; | |
5016 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
5017 | qemu_coroutine_enter(co, acb); | |
5018 | ||
0b5a2445 | 5019 | bdrv_co_maybe_schedule_bh(acb); |
4265d620 PB |
5020 | return &acb->common; |
5021 | } | |
5022 | ||
ea2384d3 FB |
5023 | void bdrv_init(void) |
5024 | { | |
5efa9d5a | 5025 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 5026 | } |
ce1a14dc | 5027 | |
eb852011 MA |
5028 | void bdrv_init_with_whitelist(void) |
5029 | { | |
5030 | use_bdrv_whitelist = 1; | |
5031 | bdrv_init(); | |
5032 | } | |
5033 | ||
d7331bed | 5034 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
097310b5 | 5035 | BlockCompletionFunc *cb, void *opaque) |
ce1a14dc | 5036 | { |
7c84b1b8 | 5037 | BlockAIOCB *acb; |
ce1a14dc | 5038 | |
d7331bed SH |
5039 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
5040 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
5041 | acb->bs = bs; |
5042 | acb->cb = cb; | |
5043 | acb->opaque = opaque; | |
f197fe2b | 5044 | acb->refcnt = 1; |
ce1a14dc PB |
5045 | return acb; |
5046 | } | |
5047 | ||
f197fe2b FZ |
5048 | void qemu_aio_ref(void *p) |
5049 | { | |
7c84b1b8 | 5050 | BlockAIOCB *acb = p; |
f197fe2b FZ |
5051 | acb->refcnt++; |
5052 | } | |
5053 | ||
8007429a | 5054 | void qemu_aio_unref(void *p) |
ce1a14dc | 5055 | { |
7c84b1b8 | 5056 | BlockAIOCB *acb = p; |
f197fe2b FZ |
5057 | assert(acb->refcnt > 0); |
5058 | if (--acb->refcnt == 0) { | |
5059 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); | |
5060 | } | |
ce1a14dc | 5061 | } |
19cb3738 | 5062 | |
f9f05dc5 KW |
5063 | /**************************************************************/ |
5064 | /* Coroutine block device emulation */ | |
5065 | ||
5066 | typedef struct CoroutineIOCompletion { | |
5067 | Coroutine *coroutine; | |
5068 | int ret; | |
5069 | } CoroutineIOCompletion; | |
5070 | ||
5071 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
5072 | { | |
5073 | CoroutineIOCompletion *co = opaque; | |
5074 | ||
5075 | co->ret = ret; | |
5076 | qemu_coroutine_enter(co->coroutine, NULL); | |
5077 | } | |
5078 | ||
5079 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
5080 | int nb_sectors, QEMUIOVector *iov, | |
5081 | bool is_write) | |
5082 | { | |
5083 | CoroutineIOCompletion co = { | |
5084 | .coroutine = qemu_coroutine_self(), | |
5085 | }; | |
7c84b1b8 | 5086 | BlockAIOCB *acb; |
f9f05dc5 KW |
5087 | |
5088 | if (is_write) { | |
a652d160 SH |
5089 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
5090 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 5091 | } else { |
a652d160 SH |
5092 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
5093 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
5094 | } |
5095 | ||
59370aaa | 5096 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
5097 | if (!acb) { |
5098 | return -EIO; | |
5099 | } | |
5100 | qemu_coroutine_yield(); | |
5101 | ||
5102 | return co.ret; | |
5103 | } | |
5104 | ||
5105 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
5106 | int64_t sector_num, int nb_sectors, | |
5107 | QEMUIOVector *iov) | |
5108 | { | |
5109 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
5110 | } | |
5111 | ||
5112 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
5113 | int64_t sector_num, int nb_sectors, | |
5114 | QEMUIOVector *iov) | |
5115 | { | |
5116 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
5117 | } | |
5118 | ||
07f07615 | 5119 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 5120 | { |
07f07615 PB |
5121 | RwCo *rwco = opaque; |
5122 | ||
5123 | rwco->ret = bdrv_co_flush(rwco->bs); | |
5124 | } | |
5125 | ||
5126 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
5127 | { | |
eb489bb1 KW |
5128 | int ret; |
5129 | ||
29cdb251 | 5130 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 5131 | return 0; |
eb489bb1 KW |
5132 | } |
5133 | ||
ca716364 | 5134 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 5135 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
5136 | if (bs->drv->bdrv_co_flush_to_os) { |
5137 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
5138 | if (ret < 0) { | |
5139 | return ret; | |
5140 | } | |
5141 | } | |
5142 | ||
ca716364 KW |
5143 | /* But don't actually force it to the disk with cache=unsafe */ |
5144 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 5145 | goto flush_parent; |
ca716364 KW |
5146 | } |
5147 | ||
bf736fe3 | 5148 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 5149 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 5150 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 | 5151 | } else if (bs->drv->bdrv_aio_flush) { |
7c84b1b8 | 5152 | BlockAIOCB *acb; |
07f07615 PB |
5153 | CoroutineIOCompletion co = { |
5154 | .coroutine = qemu_coroutine_self(), | |
5155 | }; | |
5156 | ||
5157 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
5158 | if (acb == NULL) { | |
29cdb251 | 5159 | ret = -EIO; |
07f07615 PB |
5160 | } else { |
5161 | qemu_coroutine_yield(); | |
29cdb251 | 5162 | ret = co.ret; |
07f07615 | 5163 | } |
07f07615 PB |
5164 | } else { |
5165 | /* | |
5166 | * Some block drivers always operate in either writethrough or unsafe | |
5167 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
5168 | * know how the server works (because the behaviour is hardcoded or | |
5169 | * depends on server-side configuration), so we can't ensure that | |
5170 | * everything is safe on disk. Returning an error doesn't work because | |
5171 | * that would break guests even if the server operates in writethrough | |
5172 | * mode. | |
5173 | * | |
5174 | * Let's hope the user knows what he's doing. | |
5175 | */ | |
29cdb251 | 5176 | ret = 0; |
07f07615 | 5177 | } |
29cdb251 PB |
5178 | if (ret < 0) { |
5179 | return ret; | |
5180 | } | |
5181 | ||
5182 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
5183 | * in the case of cache=unsafe, so there are no useless flushes. | |
5184 | */ | |
d4c82329 | 5185 | flush_parent: |
29cdb251 | 5186 | return bdrv_co_flush(bs->file); |
07f07615 PB |
5187 | } |
5188 | ||
5a8a30db | 5189 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 5190 | { |
5a8a30db KW |
5191 | Error *local_err = NULL; |
5192 | int ret; | |
5193 | ||
3456a8d1 KW |
5194 | if (!bs->drv) { |
5195 | return; | |
5196 | } | |
5197 | ||
7ea2d269 AK |
5198 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
5199 | return; | |
5200 | } | |
5201 | bs->open_flags &= ~BDRV_O_INCOMING; | |
5202 | ||
3456a8d1 | 5203 | if (bs->drv->bdrv_invalidate_cache) { |
5a8a30db | 5204 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
3456a8d1 | 5205 | } else if (bs->file) { |
5a8a30db KW |
5206 | bdrv_invalidate_cache(bs->file, &local_err); |
5207 | } | |
5208 | if (local_err) { | |
5209 | error_propagate(errp, local_err); | |
5210 | return; | |
0f15423c | 5211 | } |
3456a8d1 | 5212 | |
5a8a30db KW |
5213 | ret = refresh_total_sectors(bs, bs->total_sectors); |
5214 | if (ret < 0) { | |
5215 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
5216 | return; | |
5217 | } | |
0f15423c AL |
5218 | } |
5219 | ||
5a8a30db | 5220 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c AL |
5221 | { |
5222 | BlockDriverState *bs; | |
5a8a30db | 5223 | Error *local_err = NULL; |
0f15423c | 5224 | |
dc364f4c | 5225 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
5226 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5227 | ||
5228 | aio_context_acquire(aio_context); | |
5a8a30db | 5229 | bdrv_invalidate_cache(bs, &local_err); |
ed78cda3 | 5230 | aio_context_release(aio_context); |
5a8a30db KW |
5231 | if (local_err) { |
5232 | error_propagate(errp, local_err); | |
5233 | return; | |
5234 | } | |
0f15423c AL |
5235 | } |
5236 | } | |
5237 | ||
07f07615 PB |
5238 | int bdrv_flush(BlockDriverState *bs) |
5239 | { | |
5240 | Coroutine *co; | |
5241 | RwCo rwco = { | |
5242 | .bs = bs, | |
5243 | .ret = NOT_DONE, | |
e7a8a783 | 5244 | }; |
e7a8a783 | 5245 | |
07f07615 PB |
5246 | if (qemu_in_coroutine()) { |
5247 | /* Fast-path if already in coroutine context */ | |
5248 | bdrv_flush_co_entry(&rwco); | |
5249 | } else { | |
2572b37a SH |
5250 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5251 | ||
07f07615 PB |
5252 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
5253 | qemu_coroutine_enter(co, &rwco); | |
5254 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5255 | aio_poll(aio_context, true); |
07f07615 | 5256 | } |
e7a8a783 | 5257 | } |
07f07615 PB |
5258 | |
5259 | return rwco.ret; | |
e7a8a783 KW |
5260 | } |
5261 | ||
775aa8b6 KW |
5262 | typedef struct DiscardCo { |
5263 | BlockDriverState *bs; | |
5264 | int64_t sector_num; | |
5265 | int nb_sectors; | |
5266 | int ret; | |
5267 | } DiscardCo; | |
4265d620 PB |
5268 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
5269 | { | |
775aa8b6 | 5270 | DiscardCo *rwco = opaque; |
4265d620 PB |
5271 | |
5272 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
5273 | } | |
5274 | ||
5275 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
5276 | int nb_sectors) | |
5277 | { | |
b9c64947 | 5278 | int max_discard, ret; |
d51e9fe5 | 5279 | |
4265d620 PB |
5280 | if (!bs->drv) { |
5281 | return -ENOMEDIUM; | |
b9c64947 HR |
5282 | } |
5283 | ||
5284 | ret = bdrv_check_request(bs, sector_num, nb_sectors); | |
5285 | if (ret < 0) { | |
5286 | return ret; | |
4265d620 PB |
5287 | } else if (bs->read_only) { |
5288 | return -EROFS; | |
df702c9b PB |
5289 | } |
5290 | ||
e4654d2d | 5291 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 5292 | |
9e8f1835 PB |
5293 | /* Do nothing if disabled. */ |
5294 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
5295 | return 0; | |
5296 | } | |
5297 | ||
d51e9fe5 PB |
5298 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
5299 | return 0; | |
5300 | } | |
6f14da52 | 5301 | |
75af1f34 | 5302 | max_discard = MIN_NON_ZERO(bs->bl.max_discard, BDRV_REQUEST_MAX_SECTORS); |
d51e9fe5 PB |
5303 | while (nb_sectors > 0) { |
5304 | int ret; | |
5305 | int num = nb_sectors; | |
6f14da52 | 5306 | |
d51e9fe5 PB |
5307 | /* align request */ |
5308 | if (bs->bl.discard_alignment && | |
5309 | num >= bs->bl.discard_alignment && | |
5310 | sector_num % bs->bl.discard_alignment) { | |
5311 | if (num > bs->bl.discard_alignment) { | |
5312 | num = bs->bl.discard_alignment; | |
6f14da52 | 5313 | } |
d51e9fe5 PB |
5314 | num -= sector_num % bs->bl.discard_alignment; |
5315 | } | |
6f14da52 | 5316 | |
d51e9fe5 PB |
5317 | /* limit request size */ |
5318 | if (num > max_discard) { | |
5319 | num = max_discard; | |
5320 | } | |
6f14da52 | 5321 | |
d51e9fe5 | 5322 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 5323 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 | 5324 | } else { |
7c84b1b8 | 5325 | BlockAIOCB *acb; |
d51e9fe5 PB |
5326 | CoroutineIOCompletion co = { |
5327 | .coroutine = qemu_coroutine_self(), | |
5328 | }; | |
5329 | ||
5330 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
5331 | bdrv_co_io_em_complete, &co); | |
5332 | if (acb == NULL) { | |
5333 | return -EIO; | |
5334 | } else { | |
5335 | qemu_coroutine_yield(); | |
5336 | ret = co.ret; | |
6f14da52 | 5337 | } |
6f14da52 | 5338 | } |
7ce21016 | 5339 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 5340 | return ret; |
4265d620 | 5341 | } |
d51e9fe5 PB |
5342 | |
5343 | sector_num += num; | |
5344 | nb_sectors -= num; | |
4265d620 | 5345 | } |
d51e9fe5 | 5346 | return 0; |
4265d620 PB |
5347 | } |
5348 | ||
5349 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
5350 | { | |
5351 | Coroutine *co; | |
775aa8b6 | 5352 | DiscardCo rwco = { |
4265d620 PB |
5353 | .bs = bs, |
5354 | .sector_num = sector_num, | |
5355 | .nb_sectors = nb_sectors, | |
5356 | .ret = NOT_DONE, | |
5357 | }; | |
5358 | ||
5359 | if (qemu_in_coroutine()) { | |
5360 | /* Fast-path if already in coroutine context */ | |
5361 | bdrv_discard_co_entry(&rwco); | |
5362 | } else { | |
2572b37a SH |
5363 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5364 | ||
4265d620 PB |
5365 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
5366 | qemu_coroutine_enter(co, &rwco); | |
5367 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5368 | aio_poll(aio_context, true); |
4265d620 PB |
5369 | } |
5370 | } | |
5371 | ||
5372 | return rwco.ret; | |
5373 | } | |
5374 | ||
19cb3738 FB |
5375 | /**************************************************************/ |
5376 | /* removable device support */ | |
5377 | ||
5378 | /** | |
5379 | * Return TRUE if the media is present | |
5380 | */ | |
5381 | int bdrv_is_inserted(BlockDriverState *bs) | |
5382 | { | |
5383 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 5384 | |
19cb3738 FB |
5385 | if (!drv) |
5386 | return 0; | |
5387 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
5388 | return 1; |
5389 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
5390 | } |
5391 | ||
5392 | /** | |
8e49ca46 MA |
5393 | * Return whether the media changed since the last call to this |
5394 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
5395 | */ |
5396 | int bdrv_media_changed(BlockDriverState *bs) | |
5397 | { | |
5398 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5399 | |
8e49ca46 MA |
5400 | if (drv && drv->bdrv_media_changed) { |
5401 | return drv->bdrv_media_changed(bs); | |
5402 | } | |
5403 | return -ENOTSUP; | |
19cb3738 FB |
5404 | } |
5405 | ||
5406 | /** | |
5407 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
5408 | */ | |
f36f3949 | 5409 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
5410 | { |
5411 | BlockDriver *drv = bs->drv; | |
bfb197e0 | 5412 | const char *device_name; |
19cb3738 | 5413 | |
822e1cd1 MA |
5414 | if (drv && drv->bdrv_eject) { |
5415 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 5416 | } |
6f382ed2 | 5417 | |
bfb197e0 MA |
5418 | device_name = bdrv_get_device_name(bs); |
5419 | if (device_name[0] != '\0') { | |
5420 | qapi_event_send_device_tray_moved(device_name, | |
a5ee7bd4 | 5421 | eject_flag, &error_abort); |
6f382ed2 | 5422 | } |
19cb3738 FB |
5423 | } |
5424 | ||
19cb3738 FB |
5425 | /** |
5426 | * Lock or unlock the media (if it is locked, the user won't be able | |
5427 | * to eject it manually). | |
5428 | */ | |
025e849a | 5429 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
5430 | { |
5431 | BlockDriver *drv = bs->drv; | |
5432 | ||
025e849a | 5433 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5434 | |
025e849a MA |
5435 | if (drv && drv->bdrv_lock_medium) { |
5436 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5437 | } |
5438 | } | |
985a03b0 TS |
5439 | |
5440 | /* needed for generic scsi interface */ | |
5441 | ||
5442 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5443 | { | |
5444 | BlockDriver *drv = bs->drv; | |
5445 | ||
5446 | if (drv && drv->bdrv_ioctl) | |
5447 | return drv->bdrv_ioctl(bs, req, buf); | |
5448 | return -ENOTSUP; | |
5449 | } | |
7d780669 | 5450 | |
7c84b1b8 | 5451 | BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
221f715d | 5452 | unsigned long int req, void *buf, |
097310b5 | 5453 | BlockCompletionFunc *cb, void *opaque) |
7d780669 | 5454 | { |
221f715d | 5455 | BlockDriver *drv = bs->drv; |
7d780669 | 5456 | |
221f715d AL |
5457 | if (drv && drv->bdrv_aio_ioctl) |
5458 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5459 | return NULL; | |
7d780669 | 5460 | } |
e268ca52 | 5461 | |
1b7fd729 | 5462 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5463 | { |
1b7fd729 | 5464 | bs->guest_block_size = align; |
7b6f9300 | 5465 | } |
7cd1e32a | 5466 | |
e268ca52 AL |
5467 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5468 | { | |
339064d5 | 5469 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5470 | } |
7cd1e32a | 5471 | |
9ebd8448 HR |
5472 | void *qemu_blockalign0(BlockDriverState *bs, size_t size) |
5473 | { | |
5474 | return memset(qemu_blockalign(bs, size), 0, size); | |
5475 | } | |
5476 | ||
7d2a35cc KW |
5477 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size) |
5478 | { | |
5479 | size_t align = bdrv_opt_mem_align(bs); | |
5480 | ||
5481 | /* Ensure that NULL is never returned on success */ | |
5482 | assert(align > 0); | |
5483 | if (size == 0) { | |
5484 | size = align; | |
5485 | } | |
5486 | ||
5487 | return qemu_try_memalign(align, size); | |
5488 | } | |
5489 | ||
9ebd8448 HR |
5490 | void *qemu_try_blockalign0(BlockDriverState *bs, size_t size) |
5491 | { | |
5492 | void *mem = qemu_try_blockalign(bs, size); | |
5493 | ||
5494 | if (mem) { | |
5495 | memset(mem, 0, size); | |
5496 | } | |
5497 | ||
5498 | return mem; | |
5499 | } | |
5500 | ||
c53b1c51 SH |
5501 | /* |
5502 | * Check if all memory in this vector is sector aligned. | |
5503 | */ | |
5504 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5505 | { | |
5506 | int i; | |
339064d5 | 5507 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5508 | |
5509 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5510 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5511 | return false; |
1ff735bd | 5512 | } |
339064d5 | 5513 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5514 | return false; |
c53b1c51 SH |
5515 | } |
5516 | } | |
5517 | ||
5518 | return true; | |
5519 | } | |
5520 | ||
0db6e54a FZ |
5521 | BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, const char *name) |
5522 | { | |
5523 | BdrvDirtyBitmap *bm; | |
5524 | ||
5525 | assert(name); | |
5526 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5527 | if (bm->name && !strcmp(name, bm->name)) { | |
5528 | return bm; | |
5529 | } | |
5530 | } | |
5531 | return NULL; | |
5532 | } | |
5533 | ||
20dca810 | 5534 | void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap) |
0db6e54a | 5535 | { |
9bd2b08f | 5536 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
0db6e54a FZ |
5537 | g_free(bitmap->name); |
5538 | bitmap->name = NULL; | |
5539 | } | |
5540 | ||
5541 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, | |
5fba6c0e | 5542 | uint32_t granularity, |
0db6e54a | 5543 | const char *name, |
b8afb520 | 5544 | Error **errp) |
7cd1e32a LS |
5545 | { |
5546 | int64_t bitmap_size; | |
e4654d2d | 5547 | BdrvDirtyBitmap *bitmap; |
5fba6c0e | 5548 | uint32_t sector_granularity; |
a55eb92c | 5549 | |
50717e94 PB |
5550 | assert((granularity & (granularity - 1)) == 0); |
5551 | ||
0db6e54a FZ |
5552 | if (name && bdrv_find_dirty_bitmap(bs, name)) { |
5553 | error_setg(errp, "Bitmap already exists: %s", name); | |
5554 | return NULL; | |
5555 | } | |
5fba6c0e JS |
5556 | sector_granularity = granularity >> BDRV_SECTOR_BITS; |
5557 | assert(sector_granularity); | |
57322b78 | 5558 | bitmap_size = bdrv_nb_sectors(bs); |
b8afb520 FZ |
5559 | if (bitmap_size < 0) { |
5560 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); | |
5561 | errno = -bitmap_size; | |
5562 | return NULL; | |
5563 | } | |
5839e53b | 5564 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
5fba6c0e | 5565 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ctz32(sector_granularity)); |
e74e6b78 | 5566 | bitmap->size = bitmap_size; |
0db6e54a | 5567 | bitmap->name = g_strdup(name); |
b8e6fb75 | 5568 | bitmap->disabled = false; |
e4654d2d FZ |
5569 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); |
5570 | return bitmap; | |
5571 | } | |
5572 | ||
9bd2b08f JS |
5573 | bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap) |
5574 | { | |
5575 | return bitmap->successor; | |
5576 | } | |
5577 | ||
b8e6fb75 JS |
5578 | bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap) |
5579 | { | |
9bd2b08f JS |
5580 | return !(bitmap->disabled || bitmap->successor); |
5581 | } | |
5582 | ||
5583 | /** | |
5584 | * Create a successor bitmap destined to replace this bitmap after an operation. | |
5585 | * Requires that the bitmap is not frozen and has no successor. | |
5586 | */ | |
5587 | int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, | |
5588 | BdrvDirtyBitmap *bitmap, Error **errp) | |
5589 | { | |
5590 | uint64_t granularity; | |
5591 | BdrvDirtyBitmap *child; | |
5592 | ||
5593 | if (bdrv_dirty_bitmap_frozen(bitmap)) { | |
5594 | error_setg(errp, "Cannot create a successor for a bitmap that is " | |
5595 | "currently frozen"); | |
5596 | return -1; | |
5597 | } | |
5598 | assert(!bitmap->successor); | |
5599 | ||
5600 | /* Create an anonymous successor */ | |
5601 | granularity = bdrv_dirty_bitmap_granularity(bitmap); | |
5602 | child = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp); | |
5603 | if (!child) { | |
5604 | return -1; | |
5605 | } | |
5606 | ||
5607 | /* Successor will be on or off based on our current state. */ | |
5608 | child->disabled = bitmap->disabled; | |
5609 | ||
5610 | /* Install the successor and freeze the parent */ | |
5611 | bitmap->successor = child; | |
5612 | return 0; | |
5613 | } | |
5614 | ||
5615 | /** | |
5616 | * For a bitmap with a successor, yield our name to the successor, | |
5617 | * delete the old bitmap, and return a handle to the new bitmap. | |
5618 | */ | |
5619 | BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, | |
5620 | BdrvDirtyBitmap *bitmap, | |
5621 | Error **errp) | |
5622 | { | |
5623 | char *name; | |
5624 | BdrvDirtyBitmap *successor = bitmap->successor; | |
5625 | ||
5626 | if (successor == NULL) { | |
5627 | error_setg(errp, "Cannot relinquish control if " | |
5628 | "there's no successor present"); | |
5629 | return NULL; | |
5630 | } | |
5631 | ||
5632 | name = bitmap->name; | |
5633 | bitmap->name = NULL; | |
5634 | successor->name = name; | |
5635 | bitmap->successor = NULL; | |
5636 | bdrv_release_dirty_bitmap(bs, bitmap); | |
5637 | ||
5638 | return successor; | |
5639 | } | |
5640 | ||
5641 | /** | |
5642 | * In cases of failure where we can no longer safely delete the parent, | |
5643 | * we may wish to re-join the parent and child/successor. | |
5644 | * The merged parent will be un-frozen, but not explicitly re-enabled. | |
5645 | */ | |
5646 | BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, | |
5647 | BdrvDirtyBitmap *parent, | |
5648 | Error **errp) | |
5649 | { | |
5650 | BdrvDirtyBitmap *successor = parent->successor; | |
5651 | ||
5652 | if (!successor) { | |
5653 | error_setg(errp, "Cannot reclaim a successor when none is present"); | |
5654 | return NULL; | |
5655 | } | |
5656 | ||
5657 | if (!hbitmap_merge(parent->bitmap, successor->bitmap)) { | |
5658 | error_setg(errp, "Merging of parent and successor bitmap failed"); | |
5659 | return NULL; | |
5660 | } | |
5661 | bdrv_release_dirty_bitmap(bs, successor); | |
5662 | parent->successor = NULL; | |
5663 | ||
5664 | return parent; | |
b8e6fb75 JS |
5665 | } |
5666 | ||
ce1ffea8 JS |
5667 | /** |
5668 | * Truncates _all_ bitmaps attached to a BDS. | |
5669 | */ | |
5670 | static void bdrv_dirty_bitmap_truncate(BlockDriverState *bs) | |
5671 | { | |
5672 | BdrvDirtyBitmap *bitmap; | |
5673 | uint64_t size = bdrv_nb_sectors(bs); | |
5674 | ||
5675 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5676 | if (bdrv_dirty_bitmap_frozen(bitmap)) { | |
5677 | continue; | |
5678 | } | |
5679 | hbitmap_truncate(bitmap->bitmap, size); | |
5680 | } | |
5681 | } | |
5682 | ||
e4654d2d FZ |
5683 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
5684 | { | |
5685 | BdrvDirtyBitmap *bm, *next; | |
5686 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5687 | if (bm == bitmap) { | |
9bd2b08f | 5688 | assert(!bdrv_dirty_bitmap_frozen(bm)); |
e4654d2d FZ |
5689 | QLIST_REMOVE(bitmap, list); |
5690 | hbitmap_free(bitmap->bitmap); | |
0db6e54a | 5691 | g_free(bitmap->name); |
e4654d2d FZ |
5692 | g_free(bitmap); |
5693 | return; | |
a55eb92c | 5694 | } |
7cd1e32a LS |
5695 | } |
5696 | } | |
5697 | ||
b8e6fb75 JS |
5698 | void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
5699 | { | |
9bd2b08f | 5700 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
b8e6fb75 JS |
5701 | bitmap->disabled = true; |
5702 | } | |
5703 | ||
5704 | void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap) | |
5705 | { | |
9bd2b08f | 5706 | assert(!bdrv_dirty_bitmap_frozen(bitmap)); |
b8e6fb75 JS |
5707 | bitmap->disabled = false; |
5708 | } | |
5709 | ||
21b56835 FZ |
5710 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5711 | { | |
5712 | BdrvDirtyBitmap *bm; | |
5713 | BlockDirtyInfoList *list = NULL; | |
5714 | BlockDirtyInfoList **plist = &list; | |
5715 | ||
5716 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5839e53b MA |
5717 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
5718 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); | |
20dca810 | 5719 | info->count = bdrv_get_dirty_count(bm); |
592fdd02 | 5720 | info->granularity = bdrv_dirty_bitmap_granularity(bm); |
0db6e54a FZ |
5721 | info->has_name = !!bm->name; |
5722 | info->name = g_strdup(bm->name); | |
a113534f | 5723 | info->frozen = bdrv_dirty_bitmap_frozen(bm); |
21b56835 FZ |
5724 | entry->value = info; |
5725 | *plist = entry; | |
5726 | plist = &entry->next; | |
5727 | } | |
5728 | ||
5729 | return list; | |
5730 | } | |
5731 | ||
e4654d2d | 5732 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5733 | { |
e4654d2d FZ |
5734 | if (bitmap) { |
5735 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5736 | } else { |
5737 | return 0; | |
5738 | } | |
5739 | } | |
5740 | ||
341ebc2f JS |
5741 | /** |
5742 | * Chooses a default granularity based on the existing cluster size, | |
5743 | * but clamped between [4K, 64K]. Defaults to 64K in the case that there | |
5744 | * is no cluster size information available. | |
5745 | */ | |
5746 | uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs) | |
5747 | { | |
5748 | BlockDriverInfo bdi; | |
5749 | uint32_t granularity; | |
5750 | ||
5751 | if (bdrv_get_info(bs, &bdi) >= 0 && bdi.cluster_size > 0) { | |
5752 | granularity = MAX(4096, bdi.cluster_size); | |
5753 | granularity = MIN(65536, granularity); | |
5754 | } else { | |
5755 | granularity = 65536; | |
5756 | } | |
5757 | ||
5758 | return granularity; | |
5759 | } | |
5760 | ||
592fdd02 JS |
5761 | uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap) |
5762 | { | |
5763 | return BDRV_SECTOR_SIZE << hbitmap_granularity(bitmap->bitmap); | |
5764 | } | |
5765 | ||
20dca810 | 5766 | void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) |
1755da16 | 5767 | { |
e4654d2d | 5768 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5769 | } |
5770 | ||
20dca810 | 5771 | void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
c4237dfa VSO |
5772 | int64_t cur_sector, int nr_sectors) |
5773 | { | |
b8e6fb75 | 5774 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
c4237dfa VSO |
5775 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
5776 | } | |
5777 | ||
20dca810 | 5778 | void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, |
c4237dfa VSO |
5779 | int64_t cur_sector, int nr_sectors) |
5780 | { | |
b8e6fb75 | 5781 | assert(bdrv_dirty_bitmap_enabled(bitmap)); |
c4237dfa VSO |
5782 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
5783 | } | |
5784 | ||
e74e6b78 JS |
5785 | void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap) |
5786 | { | |
5787 | assert(bdrv_dirty_bitmap_enabled(bitmap)); | |
5788 | hbitmap_reset(bitmap->bitmap, 0, bitmap->size); | |
5789 | } | |
5790 | ||
e0c47b6c SH |
5791 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
5792 | int nr_sectors) | |
1755da16 | 5793 | { |
e4654d2d FZ |
5794 | BdrvDirtyBitmap *bitmap; |
5795 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
b8e6fb75 JS |
5796 | if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
5797 | continue; | |
5798 | } | |
e4654d2d FZ |
5799 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
5800 | } | |
1755da16 PB |
5801 | } |
5802 | ||
e0c47b6c SH |
5803 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
5804 | int nr_sectors) | |
7cd1e32a | 5805 | { |
e4654d2d FZ |
5806 | BdrvDirtyBitmap *bitmap; |
5807 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
b8e6fb75 JS |
5808 | if (!bdrv_dirty_bitmap_enabled(bitmap)) { |
5809 | continue; | |
5810 | } | |
e4654d2d FZ |
5811 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
5812 | } | |
7cd1e32a | 5813 | } |
aaa0eb75 | 5814 | |
d58d8453 JS |
5815 | /** |
5816 | * Advance an HBitmapIter to an arbitrary offset. | |
5817 | */ | |
5818 | void bdrv_set_dirty_iter(HBitmapIter *hbi, int64_t offset) | |
5819 | { | |
5820 | assert(hbi->hb); | |
5821 | hbitmap_iter_init(hbi, hbi->hb, offset); | |
5822 | } | |
5823 | ||
20dca810 | 5824 | int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5825 | { |
e4654d2d | 5826 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5827 | } |
f88e1a42 | 5828 | |
9fcb0251 FZ |
5829 | /* Get a reference to bs */ |
5830 | void bdrv_ref(BlockDriverState *bs) | |
5831 | { | |
5832 | bs->refcnt++; | |
5833 | } | |
5834 | ||
5835 | /* Release a previously grabbed reference to bs. | |
5836 | * If after releasing, reference count is zero, the BlockDriverState is | |
5837 | * deleted. */ | |
5838 | void bdrv_unref(BlockDriverState *bs) | |
5839 | { | |
9a4d5ca6 JC |
5840 | if (!bs) { |
5841 | return; | |
5842 | } | |
9fcb0251 FZ |
5843 | assert(bs->refcnt > 0); |
5844 | if (--bs->refcnt == 0) { | |
5845 | bdrv_delete(bs); | |
5846 | } | |
5847 | } | |
5848 | ||
fbe40ff7 FZ |
5849 | struct BdrvOpBlocker { |
5850 | Error *reason; | |
5851 | QLIST_ENTRY(BdrvOpBlocker) list; | |
5852 | }; | |
5853 | ||
5854 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
5855 | { | |
5856 | BdrvOpBlocker *blocker; | |
5857 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5858 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
5859 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
5860 | if (errp) { | |
81e5f78a AG |
5861 | error_setg(errp, "Node '%s' is busy: %s", |
5862 | bdrv_get_device_or_node_name(bs), | |
bfb197e0 | 5863 | error_get_pretty(blocker->reason)); |
fbe40ff7 FZ |
5864 | } |
5865 | return true; | |
5866 | } | |
5867 | return false; | |
5868 | } | |
5869 | ||
5870 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5871 | { | |
5872 | BdrvOpBlocker *blocker; | |
5873 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5874 | ||
5839e53b | 5875 | blocker = g_new0(BdrvOpBlocker, 1); |
fbe40ff7 FZ |
5876 | blocker->reason = reason; |
5877 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
5878 | } | |
5879 | ||
5880 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5881 | { | |
5882 | BdrvOpBlocker *blocker, *next; | |
5883 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5884 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
5885 | if (blocker->reason == reason) { | |
5886 | QLIST_REMOVE(blocker, list); | |
5887 | g_free(blocker); | |
5888 | } | |
5889 | } | |
5890 | } | |
5891 | ||
5892 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
5893 | { | |
5894 | int i; | |
5895 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5896 | bdrv_op_block(bs, i, reason); | |
5897 | } | |
5898 | } | |
5899 | ||
5900 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
5901 | { | |
5902 | int i; | |
5903 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5904 | bdrv_op_unblock(bs, i, reason); | |
5905 | } | |
5906 | } | |
5907 | ||
5908 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
5909 | { | |
5910 | int i; | |
5911 | ||
5912 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5913 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
5914 | return false; | |
5915 | } | |
5916 | } | |
5917 | return true; | |
5918 | } | |
5919 | ||
28a7282a LC |
5920 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5921 | { | |
d6bf279e | 5922 | bs->iostatus_enabled = true; |
58e21ef5 | 5923 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5924 | } |
5925 | ||
5926 | /* The I/O status is only enabled if the drive explicitly | |
5927 | * enables it _and_ the VM is configured to stop on errors */ | |
5928 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5929 | { | |
d6bf279e | 5930 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5931 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5932 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5933 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5934 | } |
5935 | ||
5936 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5937 | { | |
d6bf279e | 5938 | bs->iostatus_enabled = false; |
28a7282a LC |
5939 | } |
5940 | ||
5941 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5942 | { | |
5943 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5944 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5945 | if (bs->job) { |
5946 | block_job_iostatus_reset(bs->job); | |
5947 | } | |
28a7282a LC |
5948 | } |
5949 | } | |
5950 | ||
28a7282a LC |
5951 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5952 | { | |
3e1caa5f PB |
5953 | assert(bdrv_iostatus_is_enabled(bs)); |
5954 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5955 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5956 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5957 | } |
5958 | } | |
5959 | ||
d92ada22 LC |
5960 | void bdrv_img_create(const char *filename, const char *fmt, |
5961 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5962 | char *options, uint64_t img_size, int flags, |
5963 | Error **errp, bool quiet) | |
f88e1a42 | 5964 | { |
83d0521a CL |
5965 | QemuOptsList *create_opts = NULL; |
5966 | QemuOpts *opts = NULL; | |
5967 | const char *backing_fmt, *backing_file; | |
5968 | int64_t size; | |
f88e1a42 | 5969 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5970 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5971 | Error *local_err = NULL; |
f88e1a42 JS |
5972 | int ret = 0; |
5973 | ||
5974 | /* Find driver and parse its options */ | |
5975 | drv = bdrv_find_format(fmt); | |
5976 | if (!drv) { | |
71c79813 | 5977 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5978 | return; |
f88e1a42 JS |
5979 | } |
5980 | ||
b65a5e12 | 5981 | proto_drv = bdrv_find_protocol(filename, true, errp); |
f88e1a42 | 5982 | if (!proto_drv) { |
d92ada22 | 5983 | return; |
f88e1a42 JS |
5984 | } |
5985 | ||
c6149724 HR |
5986 | if (!drv->create_opts) { |
5987 | error_setg(errp, "Format driver '%s' does not support image creation", | |
5988 | drv->format_name); | |
5989 | return; | |
5990 | } | |
5991 | ||
5992 | if (!proto_drv->create_opts) { | |
5993 | error_setg(errp, "Protocol driver '%s' does not support image creation", | |
5994 | proto_drv->format_name); | |
5995 | return; | |
5996 | } | |
5997 | ||
c282e1fd CL |
5998 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
5999 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); | |
f88e1a42 JS |
6000 | |
6001 | /* Create parameter list with default values */ | |
83d0521a | 6002 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
39101f25 | 6003 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size, &error_abort); |
f88e1a42 JS |
6004 | |
6005 | /* Parse -o options */ | |
6006 | if (options) { | |
dc523cd3 MA |
6007 | qemu_opts_do_parse(opts, options, NULL, &local_err); |
6008 | if (local_err) { | |
6009 | error_report_err(local_err); | |
6010 | local_err = NULL; | |
83d0521a | 6011 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
f88e1a42 JS |
6012 | goto out; |
6013 | } | |
6014 | } | |
6015 | ||
6016 | if (base_filename) { | |
f43e47db | 6017 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename, &local_err); |
6be4194b | 6018 | if (local_err) { |
71c79813 LC |
6019 | error_setg(errp, "Backing file not supported for file format '%s'", |
6020 | fmt); | |
f88e1a42 JS |
6021 | goto out; |
6022 | } | |
6023 | } | |
6024 | ||
6025 | if (base_fmt) { | |
f43e47db | 6026 | qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt, &local_err); |
6be4194b | 6027 | if (local_err) { |
71c79813 LC |
6028 | error_setg(errp, "Backing file format not supported for file " |
6029 | "format '%s'", fmt); | |
f88e1a42 JS |
6030 | goto out; |
6031 | } | |
6032 | } | |
6033 | ||
83d0521a CL |
6034 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
6035 | if (backing_file) { | |
6036 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
6037 | error_setg(errp, "Error: Trying to create an image with the " |
6038 | "same filename as the backing file"); | |
792da93a JS |
6039 | goto out; |
6040 | } | |
6041 | } | |
6042 | ||
83d0521a CL |
6043 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
6044 | if (backing_fmt) { | |
6045 | backing_drv = bdrv_find_format(backing_fmt); | |
96df67d1 | 6046 | if (!backing_drv) { |
71c79813 | 6047 | error_setg(errp, "Unknown backing file format '%s'", |
83d0521a | 6048 | backing_fmt); |
f88e1a42 JS |
6049 | goto out; |
6050 | } | |
6051 | } | |
6052 | ||
6053 | // The size for the image must always be specified, with one exception: | |
6054 | // If we are using a backing file, we can obtain the size from there | |
83d0521a CL |
6055 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
6056 | if (size == -1) { | |
6057 | if (backing_file) { | |
66f6b814 | 6058 | BlockDriverState *bs; |
29168018 | 6059 | char *full_backing = g_new0(char, PATH_MAX); |
52bf1e72 | 6060 | int64_t size; |
63090dac PB |
6061 | int back_flags; |
6062 | ||
29168018 HR |
6063 | bdrv_get_full_backing_filename_from_filename(filename, backing_file, |
6064 | full_backing, PATH_MAX, | |
6065 | &local_err); | |
6066 | if (local_err) { | |
6067 | g_free(full_backing); | |
6068 | goto out; | |
6069 | } | |
6070 | ||
63090dac PB |
6071 | /* backing files always opened read-only */ |
6072 | back_flags = | |
6073 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 6074 | |
f67503e5 | 6075 | bs = NULL; |
29168018 | 6076 | ret = bdrv_open(&bs, full_backing, NULL, NULL, back_flags, |
cc84d90f | 6077 | backing_drv, &local_err); |
29168018 | 6078 | g_free(full_backing); |
f88e1a42 | 6079 | if (ret < 0) { |
f88e1a42 JS |
6080 | goto out; |
6081 | } | |
52bf1e72 MA |
6082 | size = bdrv_getlength(bs); |
6083 | if (size < 0) { | |
6084 | error_setg_errno(errp, -size, "Could not get size of '%s'", | |
6085 | backing_file); | |
6086 | bdrv_unref(bs); | |
6087 | goto out; | |
6088 | } | |
f88e1a42 | 6089 | |
39101f25 | 6090 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size, &error_abort); |
66f6b814 HR |
6091 | |
6092 | bdrv_unref(bs); | |
f88e1a42 | 6093 | } else { |
71c79813 | 6094 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
6095 | goto out; |
6096 | } | |
6097 | } | |
6098 | ||
f382d43a | 6099 | if (!quiet) { |
43c5d8f8 FZ |
6100 | printf("Formatting '%s', fmt=%s", filename, fmt); |
6101 | qemu_opts_print(opts, " "); | |
f382d43a MR |
6102 | puts(""); |
6103 | } | |
83d0521a | 6104 | |
c282e1fd | 6105 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 6106 | |
cc84d90f HR |
6107 | if (ret == -EFBIG) { |
6108 | /* This is generally a better message than whatever the driver would | |
6109 | * deliver (especially because of the cluster_size_hint), since that | |
6110 | * is most probably not much different from "image too large". */ | |
6111 | const char *cluster_size_hint = ""; | |
83d0521a | 6112 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 6113 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 6114 | } |
cc84d90f HR |
6115 | error_setg(errp, "The image size is too large for file format '%s'" |
6116 | "%s", fmt, cluster_size_hint); | |
6117 | error_free(local_err); | |
6118 | local_err = NULL; | |
f88e1a42 JS |
6119 | } |
6120 | ||
6121 | out: | |
83d0521a CL |
6122 | qemu_opts_del(opts); |
6123 | qemu_opts_free(create_opts); | |
84d18f06 | 6124 | if (local_err) { |
cc84d90f HR |
6125 | error_propagate(errp, local_err); |
6126 | } | |
f88e1a42 | 6127 | } |
85d126f3 SH |
6128 | |
6129 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
6130 | { | |
dcd04228 SH |
6131 | return bs->aio_context; |
6132 | } | |
6133 | ||
6134 | void bdrv_detach_aio_context(BlockDriverState *bs) | |
6135 | { | |
33384421 HR |
6136 | BdrvAioNotifier *baf; |
6137 | ||
dcd04228 SH |
6138 | if (!bs->drv) { |
6139 | return; | |
6140 | } | |
6141 | ||
33384421 HR |
6142 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
6143 | baf->detach_aio_context(baf->opaque); | |
6144 | } | |
6145 | ||
13af91eb SH |
6146 | if (bs->io_limits_enabled) { |
6147 | throttle_detach_aio_context(&bs->throttle_state); | |
6148 | } | |
dcd04228 SH |
6149 | if (bs->drv->bdrv_detach_aio_context) { |
6150 | bs->drv->bdrv_detach_aio_context(bs); | |
6151 | } | |
6152 | if (bs->file) { | |
6153 | bdrv_detach_aio_context(bs->file); | |
6154 | } | |
6155 | if (bs->backing_hd) { | |
6156 | bdrv_detach_aio_context(bs->backing_hd); | |
6157 | } | |
6158 | ||
6159 | bs->aio_context = NULL; | |
6160 | } | |
6161 | ||
6162 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
6163 | AioContext *new_context) | |
6164 | { | |
33384421 HR |
6165 | BdrvAioNotifier *ban; |
6166 | ||
dcd04228 SH |
6167 | if (!bs->drv) { |
6168 | return; | |
6169 | } | |
6170 | ||
6171 | bs->aio_context = new_context; | |
6172 | ||
6173 | if (bs->backing_hd) { | |
6174 | bdrv_attach_aio_context(bs->backing_hd, new_context); | |
6175 | } | |
6176 | if (bs->file) { | |
6177 | bdrv_attach_aio_context(bs->file, new_context); | |
6178 | } | |
6179 | if (bs->drv->bdrv_attach_aio_context) { | |
6180 | bs->drv->bdrv_attach_aio_context(bs, new_context); | |
6181 | } | |
13af91eb SH |
6182 | if (bs->io_limits_enabled) { |
6183 | throttle_attach_aio_context(&bs->throttle_state, new_context); | |
6184 | } | |
33384421 HR |
6185 | |
6186 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { | |
6187 | ban->attached_aio_context(new_context, ban->opaque); | |
6188 | } | |
dcd04228 SH |
6189 | } |
6190 | ||
6191 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) | |
6192 | { | |
6193 | bdrv_drain_all(); /* ensure there are no in-flight requests */ | |
6194 | ||
6195 | bdrv_detach_aio_context(bs); | |
6196 | ||
6197 | /* This function executes in the old AioContext so acquire the new one in | |
6198 | * case it runs in a different thread. | |
6199 | */ | |
6200 | aio_context_acquire(new_context); | |
6201 | bdrv_attach_aio_context(bs, new_context); | |
6202 | aio_context_release(new_context); | |
85d126f3 | 6203 | } |
d616b224 | 6204 | |
33384421 HR |
6205 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
6206 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
6207 | void (*detach_aio_context)(void *opaque), void *opaque) | |
6208 | { | |
6209 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); | |
6210 | *ban = (BdrvAioNotifier){ | |
6211 | .attached_aio_context = attached_aio_context, | |
6212 | .detach_aio_context = detach_aio_context, | |
6213 | .opaque = opaque | |
6214 | }; | |
6215 | ||
6216 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); | |
6217 | } | |
6218 | ||
6219 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
6220 | void (*attached_aio_context)(AioContext *, | |
6221 | void *), | |
6222 | void (*detach_aio_context)(void *), | |
6223 | void *opaque) | |
6224 | { | |
6225 | BdrvAioNotifier *ban, *ban_next; | |
6226 | ||
6227 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
6228 | if (ban->attached_aio_context == attached_aio_context && | |
6229 | ban->detach_aio_context == detach_aio_context && | |
6230 | ban->opaque == opaque) | |
6231 | { | |
6232 | QLIST_REMOVE(ban, list); | |
6233 | g_free(ban); | |
6234 | ||
6235 | return; | |
6236 | } | |
6237 | } | |
6238 | ||
6239 | abort(); | |
6240 | } | |
6241 | ||
d616b224 SH |
6242 | void bdrv_add_before_write_notifier(BlockDriverState *bs, |
6243 | NotifierWithReturn *notifier) | |
6244 | { | |
6245 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
6246 | } | |
6f176b48 | 6247 | |
77485434 HR |
6248 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts, |
6249 | BlockDriverAmendStatusCB *status_cb) | |
6f176b48 | 6250 | { |
c282e1fd | 6251 | if (!bs->drv->bdrv_amend_options) { |
6f176b48 HR |
6252 | return -ENOTSUP; |
6253 | } | |
77485434 | 6254 | return bs->drv->bdrv_amend_options(bs, opts, status_cb); |
6f176b48 | 6255 | } |
f6186f49 | 6256 | |
b5042a36 BC |
6257 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
6258 | * of block filter and by bdrv_is_first_non_filter. | |
6259 | * It is used to test if the given bs is the candidate or recurse more in the | |
6260 | * node graph. | |
212a5a8f | 6261 | */ |
b5042a36 | 6262 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 6263 | BlockDriverState *candidate) |
f6186f49 | 6264 | { |
b5042a36 BC |
6265 | /* return false if basic checks fails */ |
6266 | if (!bs || !bs->drv) { | |
212a5a8f | 6267 | return false; |
f6186f49 BC |
6268 | } |
6269 | ||
b5042a36 BC |
6270 | /* the code reached a non block filter driver -> check if the bs is |
6271 | * the same as the candidate. It's the recursion termination condition. | |
6272 | */ | |
6273 | if (!bs->drv->is_filter) { | |
6274 | return bs == candidate; | |
212a5a8f | 6275 | } |
b5042a36 | 6276 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 6277 | |
b5042a36 BC |
6278 | /* If the block filter recursion method is defined use it to recurse down |
6279 | * the node graph. | |
6280 | */ | |
6281 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 6282 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
6283 | } |
6284 | ||
b5042a36 BC |
6285 | /* the driver is a block filter but don't allow to recurse -> return false |
6286 | */ | |
6287 | return false; | |
f6186f49 BC |
6288 | } |
6289 | ||
212a5a8f BC |
6290 | /* This function checks if the candidate is the first non filter bs down it's |
6291 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
6292 | * from the top. Some filters can choose not to pass down the recursion. | |
6293 | */ | |
6294 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 6295 | { |
212a5a8f BC |
6296 | BlockDriverState *bs; |
6297 | ||
6298 | /* walk down the bs forest recursively */ | |
6299 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
6300 | bool perm; | |
6301 | ||
b5042a36 | 6302 | /* try to recurse in this top level bs */ |
e6dc8a1f | 6303 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
6304 | |
6305 | /* candidate is the first non filter */ | |
6306 | if (perm) { | |
6307 | return true; | |
6308 | } | |
6309 | } | |
6310 | ||
6311 | return false; | |
f6186f49 | 6312 | } |
09158f00 BC |
6313 | |
6314 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) | |
6315 | { | |
6316 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5a7e7a0b SH |
6317 | AioContext *aio_context; |
6318 | ||
09158f00 BC |
6319 | if (!to_replace_bs) { |
6320 | error_setg(errp, "Node name '%s' not found", node_name); | |
6321 | return NULL; | |
6322 | } | |
6323 | ||
5a7e7a0b SH |
6324 | aio_context = bdrv_get_aio_context(to_replace_bs); |
6325 | aio_context_acquire(aio_context); | |
6326 | ||
09158f00 | 6327 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
5a7e7a0b SH |
6328 | to_replace_bs = NULL; |
6329 | goto out; | |
09158f00 BC |
6330 | } |
6331 | ||
6332 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
6333 | * most non filter in order to prevent data corruption. | |
6334 | * Another benefit is that this tests exclude backing files which are | |
6335 | * blocked by the backing blockers. | |
6336 | */ | |
6337 | if (!bdrv_is_first_non_filter(to_replace_bs)) { | |
6338 | error_setg(errp, "Only top most non filter can be replaced"); | |
5a7e7a0b SH |
6339 | to_replace_bs = NULL; |
6340 | goto out; | |
09158f00 BC |
6341 | } |
6342 | ||
5a7e7a0b SH |
6343 | out: |
6344 | aio_context_release(aio_context); | |
09158f00 BC |
6345 | return to_replace_bs; |
6346 | } | |
448ad91d ML |
6347 | |
6348 | void bdrv_io_plug(BlockDriverState *bs) | |
6349 | { | |
6350 | BlockDriver *drv = bs->drv; | |
6351 | if (drv && drv->bdrv_io_plug) { | |
6352 | drv->bdrv_io_plug(bs); | |
6353 | } else if (bs->file) { | |
6354 | bdrv_io_plug(bs->file); | |
6355 | } | |
6356 | } | |
6357 | ||
6358 | void bdrv_io_unplug(BlockDriverState *bs) | |
6359 | { | |
6360 | BlockDriver *drv = bs->drv; | |
6361 | if (drv && drv->bdrv_io_unplug) { | |
6362 | drv->bdrv_io_unplug(bs); | |
6363 | } else if (bs->file) { | |
6364 | bdrv_io_unplug(bs->file); | |
6365 | } | |
6366 | } | |
6367 | ||
6368 | void bdrv_flush_io_queue(BlockDriverState *bs) | |
6369 | { | |
6370 | BlockDriver *drv = bs->drv; | |
6371 | if (drv && drv->bdrv_flush_io_queue) { | |
6372 | drv->bdrv_flush_io_queue(bs); | |
6373 | } else if (bs->file) { | |
6374 | bdrv_flush_io_queue(bs->file); | |
6375 | } | |
6376 | } | |
91af7014 HR |
6377 | |
6378 | static bool append_open_options(QDict *d, BlockDriverState *bs) | |
6379 | { | |
6380 | const QDictEntry *entry; | |
6381 | bool found_any = false; | |
6382 | ||
6383 | for (entry = qdict_first(bs->options); entry; | |
6384 | entry = qdict_next(bs->options, entry)) | |
6385 | { | |
6386 | /* Only take options for this level and exclude all non-driver-specific | |
6387 | * options */ | |
6388 | if (!strchr(qdict_entry_key(entry), '.') && | |
6389 | strcmp(qdict_entry_key(entry), "node-name")) | |
6390 | { | |
6391 | qobject_incref(qdict_entry_value(entry)); | |
6392 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); | |
6393 | found_any = true; | |
6394 | } | |
6395 | } | |
6396 | ||
6397 | return found_any; | |
6398 | } | |
6399 | ||
6400 | /* Updates the following BDS fields: | |
6401 | * - exact_filename: A filename which may be used for opening a block device | |
6402 | * which (mostly) equals the given BDS (even without any | |
6403 | * other options; so reading and writing must return the same | |
6404 | * results, but caching etc. may be different) | |
6405 | * - full_open_options: Options which, when given when opening a block device | |
6406 | * (without a filename), result in a BDS (mostly) | |
6407 | * equalling the given one | |
6408 | * - filename: If exact_filename is set, it is copied here. Otherwise, | |
6409 | * full_open_options is converted to a JSON object, prefixed with | |
6410 | * "json:" (for use through the JSON pseudo protocol) and put here. | |
6411 | */ | |
6412 | void bdrv_refresh_filename(BlockDriverState *bs) | |
6413 | { | |
6414 | BlockDriver *drv = bs->drv; | |
6415 | QDict *opts; | |
6416 | ||
6417 | if (!drv) { | |
6418 | return; | |
6419 | } | |
6420 | ||
6421 | /* This BDS's file name will most probably depend on its file's name, so | |
6422 | * refresh that first */ | |
6423 | if (bs->file) { | |
6424 | bdrv_refresh_filename(bs->file); | |
6425 | } | |
6426 | ||
6427 | if (drv->bdrv_refresh_filename) { | |
6428 | /* Obsolete information is of no use here, so drop the old file name | |
6429 | * information before refreshing it */ | |
6430 | bs->exact_filename[0] = '\0'; | |
6431 | if (bs->full_open_options) { | |
6432 | QDECREF(bs->full_open_options); | |
6433 | bs->full_open_options = NULL; | |
6434 | } | |
6435 | ||
6436 | drv->bdrv_refresh_filename(bs); | |
6437 | } else if (bs->file) { | |
6438 | /* Try to reconstruct valid information from the underlying file */ | |
6439 | bool has_open_options; | |
6440 | ||
6441 | bs->exact_filename[0] = '\0'; | |
6442 | if (bs->full_open_options) { | |
6443 | QDECREF(bs->full_open_options); | |
6444 | bs->full_open_options = NULL; | |
6445 | } | |
6446 | ||
6447 | opts = qdict_new(); | |
6448 | has_open_options = append_open_options(opts, bs); | |
6449 | ||
6450 | /* If no specific options have been given for this BDS, the filename of | |
6451 | * the underlying file should suffice for this one as well */ | |
6452 | if (bs->file->exact_filename[0] && !has_open_options) { | |
6453 | strcpy(bs->exact_filename, bs->file->exact_filename); | |
6454 | } | |
6455 | /* Reconstructing the full options QDict is simple for most format block | |
6456 | * drivers, as long as the full options are known for the underlying | |
6457 | * file BDS. The full options QDict of that file BDS should somehow | |
6458 | * contain a representation of the filename, therefore the following | |
6459 | * suffices without querying the (exact_)filename of this BDS. */ | |
6460 | if (bs->file->full_open_options) { | |
6461 | qdict_put_obj(opts, "driver", | |
6462 | QOBJECT(qstring_from_str(drv->format_name))); | |
6463 | QINCREF(bs->file->full_open_options); | |
6464 | qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); | |
6465 | ||
6466 | bs->full_open_options = opts; | |
6467 | } else { | |
6468 | QDECREF(opts); | |
6469 | } | |
6470 | } else if (!bs->full_open_options && qdict_size(bs->options)) { | |
6471 | /* There is no underlying file BDS (at least referenced by BDS.file), | |
6472 | * so the full options QDict should be equal to the options given | |
6473 | * specifically for this block device when it was opened (plus the | |
6474 | * driver specification). | |
6475 | * Because those options don't change, there is no need to update | |
6476 | * full_open_options when it's already set. */ | |
6477 | ||
6478 | opts = qdict_new(); | |
6479 | append_open_options(opts, bs); | |
6480 | qdict_put_obj(opts, "driver", | |
6481 | QOBJECT(qstring_from_str(drv->format_name))); | |
6482 | ||
6483 | if (bs->exact_filename[0]) { | |
6484 | /* This may not work for all block protocol drivers (some may | |
6485 | * require this filename to be parsed), but we have to find some | |
6486 | * default solution here, so just include it. If some block driver | |
6487 | * does not support pure options without any filename at all or | |
6488 | * needs some special format of the options QDict, it needs to | |
6489 | * implement the driver-specific bdrv_refresh_filename() function. | |
6490 | */ | |
6491 | qdict_put_obj(opts, "filename", | |
6492 | QOBJECT(qstring_from_str(bs->exact_filename))); | |
6493 | } | |
6494 | ||
6495 | bs->full_open_options = opts; | |
6496 | } | |
6497 | ||
6498 | if (bs->exact_filename[0]) { | |
6499 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); | |
6500 | } else if (bs->full_open_options) { | |
6501 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); | |
6502 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", | |
6503 | qstring_get_str(json)); | |
6504 | QDECREF(json); | |
6505 | } | |
6506 | } | |
5366d0c8 BC |
6507 | |
6508 | /* This accessor function purpose is to allow the device models to access the | |
6509 | * BlockAcctStats structure embedded inside a BlockDriverState without being | |
6510 | * aware of the BlockDriverState structure layout. | |
6511 | * It will go away when the BlockAcctStats structure will be moved inside | |
6512 | * the device models. | |
6513 | */ | |
6514 | BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) | |
6515 | { | |
6516 | return &bs->stats; | |
6517 | } |