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Commit | Line | Data |
---|---|---|
fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
fc01f7e7 | 37 | |
71e72a19 | 38 | #ifdef CONFIG_BSD |
7674e7bf FB |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
72cf2d4f | 42 | #include <sys/queue.h> |
c5e97233 | 43 | #ifndef __DragonFly__ |
7674e7bf FB |
44 | #include <sys/disk.h> |
45 | #endif | |
c5e97233 | 46 | #endif |
7674e7bf | 47 | |
49dc768d AL |
48 | #ifdef _WIN32 |
49 | #include <windows.h> | |
50 | #endif | |
51 | ||
1c9805a3 SH |
52 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
53 | ||
470c0504 SH |
54 | typedef enum { |
55 | BDRV_REQ_COPY_ON_READ = 0x1, | |
f08f2dda | 56 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
57 | } BdrvRequestFlags; |
58 | ||
7d4b4ba5 | 59 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
63 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
64 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 65 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
66 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
69 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
70 | int64_t sector_num, int nb_sectors, | |
71 | QEMUIOVector *iov); | |
c5fbe571 | 72 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
1c9805a3 | 75 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
77 | BdrvRequestFlags flags); | |
b2a61371 SH |
78 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
79 | int64_t sector_num, | |
80 | QEMUIOVector *qiov, | |
81 | int nb_sectors, | |
82 | BlockDriverCompletionFunc *cb, | |
83 | void *opaque, | |
8c5873d6 | 84 | bool is_write); |
b2a61371 | 85 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
86 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
87 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 88 | |
1b7bdbc1 SH |
89 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
90 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 91 | |
8a22f02a SH |
92 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
93 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 94 | |
eb852011 MA |
95 | /* If non-zero, use only whitelisted block drivers */ |
96 | static int use_bdrv_whitelist; | |
97 | ||
9e0b22f4 SH |
98 | #ifdef _WIN32 |
99 | static int is_windows_drive_prefix(const char *filename) | |
100 | { | |
101 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
102 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
103 | filename[1] == ':'); | |
104 | } | |
105 | ||
106 | int is_windows_drive(const char *filename) | |
107 | { | |
108 | if (is_windows_drive_prefix(filename) && | |
109 | filename[2] == '\0') | |
110 | return 1; | |
111 | if (strstart(filename, "\\\\.\\", NULL) || | |
112 | strstart(filename, "//./", NULL)) | |
113 | return 1; | |
114 | return 0; | |
115 | } | |
116 | #endif | |
117 | ||
0563e191 | 118 | /* throttling disk I/O limits */ |
cc0681c4 BC |
119 | void bdrv_set_io_limits(BlockDriverState *bs, |
120 | ThrottleConfig *cfg) | |
98f90dba | 121 | { |
cc0681c4 | 122 | int i; |
98f90dba | 123 | |
cc0681c4 | 124 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 125 | |
cc0681c4 BC |
126 | for (i = 0; i < 2; i++) { |
127 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 128 | } |
cc0681c4 BC |
129 | } |
130 | ||
131 | /* this function drain all the throttled IOs */ | |
132 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
133 | { | |
134 | bool drained = false; | |
135 | bool enabled = bs->io_limits_enabled; | |
136 | int i; | |
137 | ||
138 | bs->io_limits_enabled = false; | |
139 | ||
140 | for (i = 0; i < 2; i++) { | |
141 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
142 | drained = true; | |
143 | } | |
144 | } | |
145 | ||
146 | bs->io_limits_enabled = enabled; | |
98f90dba | 147 | |
cc0681c4 | 148 | return drained; |
98f90dba ZYW |
149 | } |
150 | ||
cc0681c4 | 151 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 152 | { |
cc0681c4 | 153 | bs->io_limits_enabled = false; |
0563e191 | 154 | |
cc0681c4 BC |
155 | bdrv_start_throttled_reqs(bs); |
156 | ||
157 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
158 | } |
159 | ||
cc0681c4 | 160 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 161 | { |
cc0681c4 BC |
162 | BlockDriverState *bs = opaque; |
163 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
164 | } |
165 | ||
cc0681c4 | 166 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 167 | { |
cc0681c4 BC |
168 | BlockDriverState *bs = opaque; |
169 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
170 | } |
171 | ||
cc0681c4 BC |
172 | /* should be called before bdrv_set_io_limits if a limit is set */ |
173 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
174 | { | |
175 | assert(!bs->io_limits_enabled); | |
176 | throttle_init(&bs->throttle_state, | |
177 | QEMU_CLOCK_VIRTUAL, | |
178 | bdrv_throttle_read_timer_cb, | |
179 | bdrv_throttle_write_timer_cb, | |
180 | bs); | |
181 | bs->io_limits_enabled = true; | |
182 | } | |
183 | ||
184 | /* This function makes an IO wait if needed | |
185 | * | |
186 | * @nb_sectors: the number of sectors of the IO | |
187 | * @is_write: is the IO a write | |
188 | */ | |
98f90dba | 189 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
cc0681c4 BC |
190 | int nb_sectors, |
191 | bool is_write) | |
98f90dba | 192 | { |
cc0681c4 BC |
193 | /* does this io must wait */ |
194 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 195 | |
cc0681c4 BC |
196 | /* if must wait or any request of this type throttled queue the IO */ |
197 | if (must_wait || | |
198 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
199 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
200 | } |
201 | ||
cc0681c4 BC |
202 | /* the IO will be executed, do the accounting */ |
203 | throttle_account(&bs->throttle_state, | |
204 | is_write, | |
205 | nb_sectors * BDRV_SECTOR_SIZE); | |
98f90dba | 206 | |
cc0681c4 BC |
207 | /* if the next request must wait -> do nothing */ |
208 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
209 | return; | |
98f90dba ZYW |
210 | } |
211 | ||
cc0681c4 BC |
212 | /* else queue next request for execution */ |
213 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
214 | } |
215 | ||
9e0b22f4 SH |
216 | /* check if the path starts with "<protocol>:" */ |
217 | static int path_has_protocol(const char *path) | |
218 | { | |
947995c0 PB |
219 | const char *p; |
220 | ||
9e0b22f4 SH |
221 | #ifdef _WIN32 |
222 | if (is_windows_drive(path) || | |
223 | is_windows_drive_prefix(path)) { | |
224 | return 0; | |
225 | } | |
947995c0 PB |
226 | p = path + strcspn(path, ":/\\"); |
227 | #else | |
228 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
229 | #endif |
230 | ||
947995c0 | 231 | return *p == ':'; |
9e0b22f4 SH |
232 | } |
233 | ||
83f64091 | 234 | int path_is_absolute(const char *path) |
3b0d4f61 | 235 | { |
21664424 FB |
236 | #ifdef _WIN32 |
237 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 238 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 239 | return 1; |
f53f4da9 PB |
240 | } |
241 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 242 | #else |
f53f4da9 | 243 | return (*path == '/'); |
3b9f94e1 | 244 | #endif |
3b0d4f61 FB |
245 | } |
246 | ||
83f64091 FB |
247 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
248 | path to it by considering it is relative to base_path. URL are | |
249 | supported. */ | |
250 | void path_combine(char *dest, int dest_size, | |
251 | const char *base_path, | |
252 | const char *filename) | |
3b0d4f61 | 253 | { |
83f64091 FB |
254 | const char *p, *p1; |
255 | int len; | |
256 | ||
257 | if (dest_size <= 0) | |
258 | return; | |
259 | if (path_is_absolute(filename)) { | |
260 | pstrcpy(dest, dest_size, filename); | |
261 | } else { | |
262 | p = strchr(base_path, ':'); | |
263 | if (p) | |
264 | p++; | |
265 | else | |
266 | p = base_path; | |
3b9f94e1 FB |
267 | p1 = strrchr(base_path, '/'); |
268 | #ifdef _WIN32 | |
269 | { | |
270 | const char *p2; | |
271 | p2 = strrchr(base_path, '\\'); | |
272 | if (!p1 || p2 > p1) | |
273 | p1 = p2; | |
274 | } | |
275 | #endif | |
83f64091 FB |
276 | if (p1) |
277 | p1++; | |
278 | else | |
279 | p1 = base_path; | |
280 | if (p1 > p) | |
281 | p = p1; | |
282 | len = p - base_path; | |
283 | if (len > dest_size - 1) | |
284 | len = dest_size - 1; | |
285 | memcpy(dest, base_path, len); | |
286 | dest[len] = '\0'; | |
287 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 288 | } |
3b0d4f61 FB |
289 | } |
290 | ||
dc5a1371 PB |
291 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
292 | { | |
293 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
294 | pstrcpy(dest, sz, bs->backing_file); | |
295 | } else { | |
296 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
297 | } | |
298 | } | |
299 | ||
5efa9d5a | 300 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 301 | { |
8c5873d6 SH |
302 | /* Block drivers without coroutine functions need emulation */ |
303 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
304 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
305 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
306 | ||
f8c35c1d SH |
307 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
308 | * the block driver lacks aio we need to emulate that too. | |
309 | */ | |
f9f05dc5 KW |
310 | if (!bdrv->bdrv_aio_readv) { |
311 | /* add AIO emulation layer */ | |
312 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
313 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 314 | } |
83f64091 | 315 | } |
b2e12bc6 | 316 | |
8a22f02a | 317 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 318 | } |
b338082b FB |
319 | |
320 | /* create a new block device (by default it is empty) */ | |
321 | BlockDriverState *bdrv_new(const char *device_name) | |
322 | { | |
1b7bdbc1 | 323 | BlockDriverState *bs; |
b338082b | 324 | |
7267c094 | 325 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 326 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 327 | if (device_name[0] != '\0') { |
1b7bdbc1 | 328 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 329 | } |
28a7282a | 330 | bdrv_iostatus_disable(bs); |
d7d512f6 | 331 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 332 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
333 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
334 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 335 | bs->refcnt = 1; |
d7d512f6 | 336 | |
b338082b FB |
337 | return bs; |
338 | } | |
339 | ||
d7d512f6 PB |
340 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
341 | { | |
342 | notifier_list_add(&bs->close_notifiers, notify); | |
343 | } | |
344 | ||
ea2384d3 FB |
345 | BlockDriver *bdrv_find_format(const char *format_name) |
346 | { | |
347 | BlockDriver *drv1; | |
8a22f02a SH |
348 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
349 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 350 | return drv1; |
8a22f02a | 351 | } |
ea2384d3 FB |
352 | } |
353 | return NULL; | |
354 | } | |
355 | ||
b64ec4e4 | 356 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 357 | { |
b64ec4e4 FZ |
358 | static const char *whitelist_rw[] = { |
359 | CONFIG_BDRV_RW_WHITELIST | |
360 | }; | |
361 | static const char *whitelist_ro[] = { | |
362 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
363 | }; |
364 | const char **p; | |
365 | ||
b64ec4e4 | 366 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 367 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 368 | } |
eb852011 | 369 | |
b64ec4e4 | 370 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
371 | if (!strcmp(drv->format_name, *p)) { |
372 | return 1; | |
373 | } | |
374 | } | |
b64ec4e4 FZ |
375 | if (read_only) { |
376 | for (p = whitelist_ro; *p; p++) { | |
377 | if (!strcmp(drv->format_name, *p)) { | |
378 | return 1; | |
379 | } | |
380 | } | |
381 | } | |
eb852011 MA |
382 | return 0; |
383 | } | |
384 | ||
b64ec4e4 FZ |
385 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
386 | bool read_only) | |
eb852011 MA |
387 | { |
388 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 389 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
390 | } |
391 | ||
5b7e1542 ZYW |
392 | typedef struct CreateCo { |
393 | BlockDriver *drv; | |
394 | char *filename; | |
395 | QEMUOptionParameter *options; | |
396 | int ret; | |
397 | } CreateCo; | |
398 | ||
399 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
400 | { | |
401 | CreateCo *cco = opaque; | |
402 | assert(cco->drv); | |
403 | ||
d5124c00 | 404 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options, NULL); |
5b7e1542 ZYW |
405 | } |
406 | ||
0e7e1989 KW |
407 | int bdrv_create(BlockDriver *drv, const char* filename, |
408 | QEMUOptionParameter *options) | |
ea2384d3 | 409 | { |
5b7e1542 ZYW |
410 | int ret; |
411 | ||
412 | Coroutine *co; | |
413 | CreateCo cco = { | |
414 | .drv = drv, | |
415 | .filename = g_strdup(filename), | |
416 | .options = options, | |
417 | .ret = NOT_DONE, | |
418 | }; | |
419 | ||
420 | if (!drv->bdrv_create) { | |
80168bff LC |
421 | ret = -ENOTSUP; |
422 | goto out; | |
5b7e1542 ZYW |
423 | } |
424 | ||
425 | if (qemu_in_coroutine()) { | |
426 | /* Fast-path if already in coroutine context */ | |
427 | bdrv_create_co_entry(&cco); | |
428 | } else { | |
429 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
430 | qemu_coroutine_enter(co, &cco); | |
431 | while (cco.ret == NOT_DONE) { | |
432 | qemu_aio_wait(); | |
433 | } | |
434 | } | |
435 | ||
436 | ret = cco.ret; | |
0e7e1989 | 437 | |
80168bff LC |
438 | out: |
439 | g_free(cco.filename); | |
5b7e1542 | 440 | return ret; |
ea2384d3 FB |
441 | } |
442 | ||
84a12e66 CH |
443 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
444 | { | |
445 | BlockDriver *drv; | |
446 | ||
98289620 | 447 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 448 | if (drv == NULL) { |
16905d71 | 449 | return -ENOENT; |
84a12e66 CH |
450 | } |
451 | ||
452 | return bdrv_create(drv, filename, options); | |
453 | } | |
454 | ||
eba25057 JM |
455 | /* |
456 | * Create a uniquely-named empty temporary file. | |
457 | * Return 0 upon success, otherwise a negative errno value. | |
458 | */ | |
459 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 460 | { |
eba25057 | 461 | #ifdef _WIN32 |
3b9f94e1 | 462 | char temp_dir[MAX_PATH]; |
eba25057 JM |
463 | /* GetTempFileName requires that its output buffer (4th param) |
464 | have length MAX_PATH or greater. */ | |
465 | assert(size >= MAX_PATH); | |
466 | return (GetTempPath(MAX_PATH, temp_dir) | |
467 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
468 | ? 0 : -GetLastError()); | |
d5249393 | 469 | #else |
67b915a5 | 470 | int fd; |
7ccfb2eb | 471 | const char *tmpdir; |
0badc1ee AJ |
472 | tmpdir = getenv("TMPDIR"); |
473 | if (!tmpdir) | |
474 | tmpdir = "/tmp"; | |
eba25057 JM |
475 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
476 | return -EOVERFLOW; | |
477 | } | |
ea2384d3 | 478 | fd = mkstemp(filename); |
fe235a06 DH |
479 | if (fd < 0) { |
480 | return -errno; | |
481 | } | |
482 | if (close(fd) != 0) { | |
483 | unlink(filename); | |
eba25057 JM |
484 | return -errno; |
485 | } | |
486 | return 0; | |
d5249393 | 487 | #endif |
eba25057 | 488 | } |
fc01f7e7 | 489 | |
84a12e66 CH |
490 | /* |
491 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
492 | * recognized as a host CDROM. | |
493 | */ | |
494 | static BlockDriver *find_hdev_driver(const char *filename) | |
495 | { | |
496 | int score_max = 0, score; | |
497 | BlockDriver *drv = NULL, *d; | |
498 | ||
499 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
500 | if (d->bdrv_probe_device) { | |
501 | score = d->bdrv_probe_device(filename); | |
502 | if (score > score_max) { | |
503 | score_max = score; | |
504 | drv = d; | |
505 | } | |
506 | } | |
507 | } | |
508 | ||
509 | return drv; | |
510 | } | |
511 | ||
98289620 KW |
512 | BlockDriver *bdrv_find_protocol(const char *filename, |
513 | bool allow_protocol_prefix) | |
83f64091 FB |
514 | { |
515 | BlockDriver *drv1; | |
516 | char protocol[128]; | |
1cec71e3 | 517 | int len; |
83f64091 | 518 | const char *p; |
19cb3738 | 519 | |
66f82cee KW |
520 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
521 | ||
39508e7a CH |
522 | /* |
523 | * XXX(hch): we really should not let host device detection | |
524 | * override an explicit protocol specification, but moving this | |
525 | * later breaks access to device names with colons in them. | |
526 | * Thanks to the brain-dead persistent naming schemes on udev- | |
527 | * based Linux systems those actually are quite common. | |
528 | */ | |
529 | drv1 = find_hdev_driver(filename); | |
530 | if (drv1) { | |
531 | return drv1; | |
532 | } | |
533 | ||
98289620 | 534 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 535 | return bdrv_find_format("file"); |
84a12e66 | 536 | } |
98289620 | 537 | |
9e0b22f4 SH |
538 | p = strchr(filename, ':'); |
539 | assert(p != NULL); | |
1cec71e3 AL |
540 | len = p - filename; |
541 | if (len > sizeof(protocol) - 1) | |
542 | len = sizeof(protocol) - 1; | |
543 | memcpy(protocol, filename, len); | |
544 | protocol[len] = '\0'; | |
8a22f02a | 545 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 546 | if (drv1->protocol_name && |
8a22f02a | 547 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 548 | return drv1; |
8a22f02a | 549 | } |
83f64091 FB |
550 | } |
551 | return NULL; | |
552 | } | |
553 | ||
f500a6d3 | 554 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 555 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 556 | { |
f500a6d3 | 557 | int score, score_max; |
f3a5d3f8 CH |
558 | BlockDriver *drv1, *drv; |
559 | uint8_t buf[2048]; | |
f500a6d3 | 560 | int ret = 0; |
f8ea0b00 | 561 | |
08a00559 | 562 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 563 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
564 | drv = bdrv_find_format("raw"); |
565 | if (!drv) { | |
34b5d2c6 | 566 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
567 | ret = -ENOENT; |
568 | } | |
569 | *pdrv = drv; | |
570 | return ret; | |
1a396859 | 571 | } |
f8ea0b00 | 572 | |
83f64091 | 573 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 574 | if (ret < 0) { |
34b5d2c6 MR |
575 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
576 | "format"); | |
c98ac35d SW |
577 | *pdrv = NULL; |
578 | return ret; | |
83f64091 FB |
579 | } |
580 | ||
ea2384d3 | 581 | score_max = 0; |
84a12e66 | 582 | drv = NULL; |
8a22f02a | 583 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
584 | if (drv1->bdrv_probe) { |
585 | score = drv1->bdrv_probe(buf, ret, filename); | |
586 | if (score > score_max) { | |
587 | score_max = score; | |
588 | drv = drv1; | |
589 | } | |
0849bf08 | 590 | } |
fc01f7e7 | 591 | } |
c98ac35d | 592 | if (!drv) { |
34b5d2c6 MR |
593 | error_setg(errp, "Could not determine image format: No compatible " |
594 | "driver found"); | |
c98ac35d SW |
595 | ret = -ENOENT; |
596 | } | |
597 | *pdrv = drv; | |
598 | return ret; | |
ea2384d3 FB |
599 | } |
600 | ||
51762288 SH |
601 | /** |
602 | * Set the current 'total_sectors' value | |
603 | */ | |
604 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
605 | { | |
606 | BlockDriver *drv = bs->drv; | |
607 | ||
396759ad NB |
608 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
609 | if (bs->sg) | |
610 | return 0; | |
611 | ||
51762288 SH |
612 | /* query actual device if possible, otherwise just trust the hint */ |
613 | if (drv->bdrv_getlength) { | |
614 | int64_t length = drv->bdrv_getlength(bs); | |
615 | if (length < 0) { | |
616 | return length; | |
617 | } | |
618 | hint = length >> BDRV_SECTOR_BITS; | |
619 | } | |
620 | ||
621 | bs->total_sectors = hint; | |
622 | return 0; | |
623 | } | |
624 | ||
9e8f1835 PB |
625 | /** |
626 | * Set open flags for a given discard mode | |
627 | * | |
628 | * Return 0 on success, -1 if the discard mode was invalid. | |
629 | */ | |
630 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
631 | { | |
632 | *flags &= ~BDRV_O_UNMAP; | |
633 | ||
634 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
635 | /* do nothing */ | |
636 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
637 | *flags |= BDRV_O_UNMAP; | |
638 | } else { | |
639 | return -1; | |
640 | } | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
c3993cdc SH |
645 | /** |
646 | * Set open flags for a given cache mode | |
647 | * | |
648 | * Return 0 on success, -1 if the cache mode was invalid. | |
649 | */ | |
650 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
651 | { | |
652 | *flags &= ~BDRV_O_CACHE_MASK; | |
653 | ||
654 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
655 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
656 | } else if (!strcmp(mode, "directsync")) { |
657 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
658 | } else if (!strcmp(mode, "writeback")) { |
659 | *flags |= BDRV_O_CACHE_WB; | |
660 | } else if (!strcmp(mode, "unsafe")) { | |
661 | *flags |= BDRV_O_CACHE_WB; | |
662 | *flags |= BDRV_O_NO_FLUSH; | |
663 | } else if (!strcmp(mode, "writethrough")) { | |
664 | /* this is the default */ | |
665 | } else { | |
666 | return -1; | |
667 | } | |
668 | ||
669 | return 0; | |
670 | } | |
671 | ||
53fec9d3 SH |
672 | /** |
673 | * The copy-on-read flag is actually a reference count so multiple users may | |
674 | * use the feature without worrying about clobbering its previous state. | |
675 | * Copy-on-read stays enabled until all users have called to disable it. | |
676 | */ | |
677 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
678 | { | |
679 | bs->copy_on_read++; | |
680 | } | |
681 | ||
682 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
683 | { | |
684 | assert(bs->copy_on_read > 0); | |
685 | bs->copy_on_read--; | |
686 | } | |
687 | ||
7b272452 KW |
688 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
689 | { | |
690 | int open_flags = flags | BDRV_O_CACHE_WB; | |
691 | ||
692 | /* | |
693 | * Clear flags that are internal to the block layer before opening the | |
694 | * image. | |
695 | */ | |
696 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
697 | ||
698 | /* | |
699 | * Snapshots should be writable. | |
700 | */ | |
701 | if (bs->is_temporary) { | |
702 | open_flags |= BDRV_O_RDWR; | |
703 | } | |
704 | ||
705 | return open_flags; | |
706 | } | |
707 | ||
57915332 KW |
708 | /* |
709 | * Common part for opening disk images and files | |
b6ad491a KW |
710 | * |
711 | * Removes all processed options from *options. | |
57915332 | 712 | */ |
f500a6d3 | 713 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 714 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
715 | { |
716 | int ret, open_flags; | |
035fccdf | 717 | const char *filename; |
34b5d2c6 | 718 | Error *local_err = NULL; |
57915332 KW |
719 | |
720 | assert(drv != NULL); | |
6405875c | 721 | assert(bs->file == NULL); |
707ff828 | 722 | assert(options != NULL && bs->options != options); |
57915332 | 723 | |
45673671 KW |
724 | if (file != NULL) { |
725 | filename = file->filename; | |
726 | } else { | |
727 | filename = qdict_get_try_str(options, "filename"); | |
728 | } | |
729 | ||
730 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); | |
28dcee10 | 731 | |
5d186eb0 KW |
732 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
733 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
734 | * and return immediately. */ | |
735 | if (file != NULL && drv->bdrv_file_open) { | |
736 | bdrv_swap(file, bs); | |
737 | return 0; | |
738 | } | |
739 | ||
57915332 | 740 | bs->open_flags = flags; |
57915332 | 741 | bs->buffer_alignment = 512; |
0d51b4de | 742 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
743 | open_flags = bdrv_open_flags(bs, flags); |
744 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
745 | ||
746 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
34b5d2c6 | 747 | error_setg(errp, "Driver '%s' is not whitelisted", drv->format_name); |
b64ec4e4 FZ |
748 | return -ENOTSUP; |
749 | } | |
57915332 | 750 | |
53fec9d3 | 751 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
b64ec4e4 | 752 | if (!bs->read_only && (flags & BDRV_O_COPY_ON_READ)) { |
53fec9d3 SH |
753 | bdrv_enable_copy_on_read(bs); |
754 | } | |
755 | ||
c2ad1b0c KW |
756 | if (filename != NULL) { |
757 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
758 | } else { | |
759 | bs->filename[0] = '\0'; | |
760 | } | |
57915332 | 761 | |
57915332 | 762 | bs->drv = drv; |
7267c094 | 763 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 764 | |
03f541bd | 765 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 766 | |
66f82cee KW |
767 | /* Open the image, either directly or using a protocol */ |
768 | if (drv->bdrv_file_open) { | |
5d186eb0 KW |
769 | assert(file == NULL); |
770 | assert(drv->bdrv_parse_filename || filename != NULL); | |
34b5d2c6 | 771 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 772 | } else { |
2af5ef70 | 773 | if (file == NULL) { |
34b5d2c6 MR |
774 | error_setg(errp, "Can't use '%s' as a block driver for the " |
775 | "protocol level", drv->format_name); | |
2af5ef70 KW |
776 | ret = -EINVAL; |
777 | goto free_and_fail; | |
778 | } | |
f500a6d3 | 779 | bs->file = file; |
34b5d2c6 | 780 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
781 | } |
782 | ||
57915332 | 783 | if (ret < 0) { |
34b5d2c6 MR |
784 | if (error_is_set(&local_err)) { |
785 | error_propagate(errp, local_err); | |
786 | } else if (filename) { | |
787 | error_setg_errno(errp, -ret, "Could not open '%s'", filename); | |
788 | } else { | |
789 | error_setg_errno(errp, -ret, "Could not open image"); | |
790 | } | |
57915332 KW |
791 | goto free_and_fail; |
792 | } | |
793 | ||
51762288 SH |
794 | ret = refresh_total_sectors(bs, bs->total_sectors); |
795 | if (ret < 0) { | |
34b5d2c6 | 796 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 797 | goto free_and_fail; |
57915332 | 798 | } |
51762288 | 799 | |
57915332 KW |
800 | #ifndef _WIN32 |
801 | if (bs->is_temporary) { | |
c2ad1b0c | 802 | assert(filename != NULL); |
57915332 KW |
803 | unlink(filename); |
804 | } | |
805 | #endif | |
806 | return 0; | |
807 | ||
808 | free_and_fail: | |
f500a6d3 | 809 | bs->file = NULL; |
7267c094 | 810 | g_free(bs->opaque); |
57915332 KW |
811 | bs->opaque = NULL; |
812 | bs->drv = NULL; | |
813 | return ret; | |
814 | } | |
815 | ||
b6ce07aa KW |
816 | /* |
817 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
818 | * |
819 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
820 | * empty set of options. The reference to the QDict belongs to the block layer | |
821 | * after the call (even on failure), so if the caller intends to reuse the | |
822 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 823 | */ |
787e4a85 | 824 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
34b5d2c6 | 825 | QDict *options, int flags, Error **errp) |
ea2384d3 | 826 | { |
83f64091 | 827 | BlockDriverState *bs; |
6db95603 | 828 | BlockDriver *drv; |
c2ad1b0c | 829 | const char *drvname; |
98289620 | 830 | bool allow_protocol_prefix = false; |
34b5d2c6 | 831 | Error *local_err = NULL; |
83f64091 FB |
832 | int ret; |
833 | ||
707ff828 KW |
834 | /* NULL means an empty set of options */ |
835 | if (options == NULL) { | |
836 | options = qdict_new(); | |
837 | } | |
838 | ||
83f64091 | 839 | bs = bdrv_new(""); |
707ff828 KW |
840 | bs->options = options; |
841 | options = qdict_clone_shallow(options); | |
842 | ||
035fccdf KW |
843 | /* Fetch the file name from the options QDict if necessary */ |
844 | if (!filename) { | |
845 | filename = qdict_get_try_str(options, "filename"); | |
846 | } else if (filename && !qdict_haskey(options, "filename")) { | |
847 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 848 | allow_protocol_prefix = true; |
035fccdf | 849 | } else { |
34b5d2c6 MR |
850 | error_setg(errp, "Can't specify 'file' and 'filename' options at the " |
851 | "same time"); | |
035fccdf KW |
852 | ret = -EINVAL; |
853 | goto fail; | |
854 | } | |
855 | ||
c2ad1b0c KW |
856 | /* Find the right block driver */ |
857 | drvname = qdict_get_try_str(options, "driver"); | |
858 | if (drvname) { | |
b64ec4e4 | 859 | drv = bdrv_find_whitelisted_format(drvname, !(flags & BDRV_O_RDWR)); |
34b5d2c6 MR |
860 | if (!drv) { |
861 | error_setg(errp, "Unknown driver '%s'", drvname); | |
862 | } | |
c2ad1b0c KW |
863 | qdict_del(options, "driver"); |
864 | } else if (filename) { | |
98289620 KW |
865 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
866 | if (!drv) { | |
34b5d2c6 | 867 | error_setg(errp, "Unknown protocol"); |
98289620 | 868 | } |
c2ad1b0c | 869 | } else { |
34b5d2c6 | 870 | error_setg(errp, "Must specify either driver or file"); |
c2ad1b0c KW |
871 | drv = NULL; |
872 | } | |
873 | ||
874 | if (!drv) { | |
34b5d2c6 | 875 | /* errp has been set already */ |
c2ad1b0c KW |
876 | ret = -ENOENT; |
877 | goto fail; | |
878 | } | |
879 | ||
880 | /* Parse the filename and open it */ | |
881 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d KW |
882 | drv->bdrv_parse_filename(filename, options, &local_err); |
883 | if (error_is_set(&local_err)) { | |
34b5d2c6 | 884 | error_propagate(errp, local_err); |
6963a30d KW |
885 | ret = -EINVAL; |
886 | goto fail; | |
887 | } | |
56d1b4d2 | 888 | qdict_del(options, "filename"); |
c2ad1b0c | 889 | } else if (!drv->bdrv_parse_filename && !filename) { |
34b5d2c6 MR |
890 | error_setg(errp, "The '%s' block driver requires a file name", |
891 | drv->format_name); | |
c2ad1b0c KW |
892 | ret = -EINVAL; |
893 | goto fail; | |
6963a30d KW |
894 | } |
895 | ||
34b5d2c6 | 896 | ret = bdrv_open_common(bs, NULL, options, flags, drv, &local_err); |
83f64091 | 897 | if (ret < 0) { |
34b5d2c6 | 898 | error_propagate(errp, local_err); |
707ff828 KW |
899 | goto fail; |
900 | } | |
901 | ||
902 | /* Check if any unknown options were used */ | |
903 | if (qdict_size(options) != 0) { | |
904 | const QDictEntry *entry = qdict_first(options); | |
34b5d2c6 MR |
905 | error_setg(errp, "Block protocol '%s' doesn't support the option '%s'", |
906 | drv->format_name, entry->key); | |
707ff828 KW |
907 | ret = -EINVAL; |
908 | goto fail; | |
3b0d4f61 | 909 | } |
707ff828 KW |
910 | QDECREF(options); |
911 | ||
71d0770c | 912 | bs->growable = 1; |
83f64091 FB |
913 | *pbs = bs; |
914 | return 0; | |
707ff828 KW |
915 | |
916 | fail: | |
917 | QDECREF(options); | |
918 | if (!bs->drv) { | |
919 | QDECREF(bs->options); | |
920 | } | |
4f6fd349 | 921 | bdrv_unref(bs); |
707ff828 | 922 | return ret; |
83f64091 FB |
923 | } |
924 | ||
31ca6d07 KW |
925 | /* |
926 | * Opens the backing file for a BlockDriverState if not yet open | |
927 | * | |
928 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
929 | * empty set of options. The reference to the QDict is transferred to this | |
930 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
931 | * it needs to use QINCREF() before calling bdrv_file_open. | |
932 | */ | |
34b5d2c6 | 933 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 PB |
934 | { |
935 | char backing_filename[PATH_MAX]; | |
936 | int back_flags, ret; | |
937 | BlockDriver *back_drv = NULL; | |
34b5d2c6 | 938 | Error *local_err = NULL; |
9156df12 PB |
939 | |
940 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 941 | QDECREF(options); |
9156df12 PB |
942 | return 0; |
943 | } | |
944 | ||
31ca6d07 KW |
945 | /* NULL means an empty set of options */ |
946 | if (options == NULL) { | |
947 | options = qdict_new(); | |
948 | } | |
949 | ||
9156df12 | 950 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
951 | if (qdict_haskey(options, "file.filename")) { |
952 | backing_filename[0] = '\0'; | |
953 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 954 | QDECREF(options); |
9156df12 PB |
955 | return 0; |
956 | } | |
957 | ||
958 | bs->backing_hd = bdrv_new(""); | |
959 | bdrv_get_full_backing_filename(bs, backing_filename, | |
960 | sizeof(backing_filename)); | |
961 | ||
962 | if (bs->backing_format[0] != '\0') { | |
963 | back_drv = bdrv_find_format(bs->backing_format); | |
964 | } | |
965 | ||
966 | /* backing files always opened read-only */ | |
967 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); | |
968 | ||
31ca6d07 KW |
969 | ret = bdrv_open(bs->backing_hd, |
970 | *backing_filename ? backing_filename : NULL, options, | |
34b5d2c6 | 971 | back_flags, back_drv, &local_err); |
9156df12 | 972 | if (ret < 0) { |
4f6fd349 | 973 | bdrv_unref(bs->backing_hd); |
9156df12 PB |
974 | bs->backing_hd = NULL; |
975 | bs->open_flags |= BDRV_O_NO_BACKING; | |
34b5d2c6 | 976 | error_propagate(errp, local_err); |
9156df12 PB |
977 | return ret; |
978 | } | |
979 | return 0; | |
980 | } | |
981 | ||
707ff828 KW |
982 | static void extract_subqdict(QDict *src, QDict **dst, const char *start) |
983 | { | |
984 | const QDictEntry *entry, *next; | |
985 | const char *p; | |
986 | ||
987 | *dst = qdict_new(); | |
988 | entry = qdict_first(src); | |
989 | ||
990 | while (entry != NULL) { | |
991 | next = qdict_next(src, entry); | |
992 | if (strstart(entry->key, start, &p)) { | |
993 | qobject_incref(entry->value); | |
994 | qdict_put_obj(*dst, p, entry->value); | |
995 | qdict_del(src, entry->key); | |
996 | } | |
997 | entry = next; | |
998 | } | |
999 | } | |
1000 | ||
b6ce07aa KW |
1001 | /* |
1002 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1003 | * |
1004 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1005 | * empty set of options. The reference to the QDict belongs to the block layer | |
1006 | * after the call (even on failure), so if the caller intends to reuse the | |
1007 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 1008 | */ |
de9c0cec | 1009 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
34b5d2c6 | 1010 | int flags, BlockDriver *drv, Error **errp) |
ea2384d3 | 1011 | { |
b6ce07aa | 1012 | int ret; |
89c9bc3d SW |
1013 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
1014 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 1015 | BlockDriverState *file = NULL; |
707ff828 | 1016 | QDict *file_options = NULL; |
74fe54f2 | 1017 | const char *drvname; |
34b5d2c6 | 1018 | Error *local_err = NULL; |
712e7874 | 1019 | |
de9c0cec KW |
1020 | /* NULL means an empty set of options */ |
1021 | if (options == NULL) { | |
1022 | options = qdict_new(); | |
1023 | } | |
1024 | ||
1025 | bs->options = options; | |
b6ad491a | 1026 | options = qdict_clone_shallow(options); |
de9c0cec KW |
1027 | |
1028 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 1029 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
1030 | BlockDriverState *bs1; |
1031 | int64_t total_size; | |
91a073a9 | 1032 | BlockDriver *bdrv_qcow2; |
08b392e1 | 1033 | QEMUOptionParameter *create_options; |
b6ce07aa | 1034 | char backing_filename[PATH_MAX]; |
3b46e624 | 1035 | |
c2ad1b0c | 1036 | if (qdict_size(options) != 0) { |
34b5d2c6 | 1037 | error_setg(errp, "Can't use snapshot=on with driver-specific options"); |
c2ad1b0c KW |
1038 | ret = -EINVAL; |
1039 | goto fail; | |
1040 | } | |
1041 | assert(filename != NULL); | |
1042 | ||
ea2384d3 FB |
1043 | /* if snapshot, we create a temporary backing file and open it |
1044 | instead of opening 'filename' directly */ | |
33e3963e | 1045 | |
ea2384d3 FB |
1046 | /* if there is a backing file, use it */ |
1047 | bs1 = bdrv_new(""); | |
34b5d2c6 | 1048 | ret = bdrv_open(bs1, filename, NULL, 0, drv, &local_err); |
51d7c00c | 1049 | if (ret < 0) { |
4f6fd349 | 1050 | bdrv_unref(bs1); |
de9c0cec | 1051 | goto fail; |
ea2384d3 | 1052 | } |
3e82990b | 1053 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1054 | |
4f6fd349 | 1055 | bdrv_unref(bs1); |
3b46e624 | 1056 | |
eba25057 JM |
1057 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1058 | if (ret < 0) { | |
34b5d2c6 | 1059 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
de9c0cec | 1060 | goto fail; |
eba25057 | 1061 | } |
7c96d46e AL |
1062 | |
1063 | /* Real path is meaningless for protocols */ | |
4d70655b | 1064 | if (path_has_protocol(filename)) { |
7c96d46e AL |
1065 | snprintf(backing_filename, sizeof(backing_filename), |
1066 | "%s", filename); | |
de9c0cec | 1067 | } else if (!realpath(filename, backing_filename)) { |
34b5d2c6 | 1068 | error_setg_errno(errp, errno, "Could not resolve path '%s'", filename); |
de9c0cec KW |
1069 | ret = -errno; |
1070 | goto fail; | |
1071 | } | |
7c96d46e | 1072 | |
91a073a9 | 1073 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1074 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1075 | NULL); | |
91a073a9 | 1076 | |
08b392e1 KW |
1077 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
1078 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FILE, | |
1079 | backing_filename); | |
91a073a9 | 1080 | if (drv) { |
08b392e1 | 1081 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FMT, |
91a073a9 KW |
1082 | drv->format_name); |
1083 | } | |
1084 | ||
08b392e1 KW |
1085 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options); |
1086 | free_option_parameters(create_options); | |
51d7c00c | 1087 | if (ret < 0) { |
34b5d2c6 MR |
1088 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
1089 | "'%s'", tmp_filename); | |
de9c0cec | 1090 | goto fail; |
ea2384d3 | 1091 | } |
91a073a9 | 1092 | |
ea2384d3 | 1093 | filename = tmp_filename; |
91a073a9 | 1094 | drv = bdrv_qcow2; |
ea2384d3 FB |
1095 | bs->is_temporary = 1; |
1096 | } | |
712e7874 | 1097 | |
f500a6d3 KW |
1098 | /* Open image file without format layer */ |
1099 | if (flags & BDRV_O_RDWR) { | |
1100 | flags |= BDRV_O_ALLOW_RDWR; | |
1101 | } | |
1102 | ||
707ff828 KW |
1103 | extract_subqdict(options, &file_options, "file."); |
1104 | ||
1105 | ret = bdrv_file_open(&file, filename, file_options, | |
34b5d2c6 | 1106 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP), &local_err); |
f500a6d3 | 1107 | if (ret < 0) { |
de9c0cec | 1108 | goto fail; |
f500a6d3 KW |
1109 | } |
1110 | ||
b6ce07aa | 1111 | /* Find the right image format driver */ |
74fe54f2 KW |
1112 | drvname = qdict_get_try_str(options, "driver"); |
1113 | if (drvname) { | |
1114 | drv = bdrv_find_whitelisted_format(drvname, !(flags & BDRV_O_RDWR)); | |
1115 | qdict_del(options, "driver"); | |
1116 | } | |
1117 | ||
6db95603 | 1118 | if (!drv) { |
34b5d2c6 | 1119 | ret = find_image_format(file, filename, &drv, &local_err); |
51d7c00c | 1120 | } |
6987307c | 1121 | |
51d7c00c | 1122 | if (!drv) { |
51d7c00c | 1123 | goto unlink_and_fail; |
ea2384d3 | 1124 | } |
b6ce07aa KW |
1125 | |
1126 | /* Open the image */ | |
34b5d2c6 | 1127 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1128 | if (ret < 0) { |
6987307c CH |
1129 | goto unlink_and_fail; |
1130 | } | |
1131 | ||
f500a6d3 | 1132 | if (bs->file != file) { |
4f6fd349 | 1133 | bdrv_unref(file); |
f500a6d3 KW |
1134 | file = NULL; |
1135 | } | |
1136 | ||
b6ce07aa | 1137 | /* If there is a backing file, use it */ |
9156df12 | 1138 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1139 | QDict *backing_options; |
1140 | ||
1141 | extract_subqdict(options, &backing_options, "backing."); | |
34b5d2c6 | 1142 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1143 | if (ret < 0) { |
b6ad491a | 1144 | goto close_and_fail; |
b6ce07aa | 1145 | } |
b6ce07aa KW |
1146 | } |
1147 | ||
b6ad491a KW |
1148 | /* Check if any unknown options were used */ |
1149 | if (qdict_size(options) != 0) { | |
1150 | const QDictEntry *entry = qdict_first(options); | |
34b5d2c6 MR |
1151 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
1152 | "support the option '%s'", drv->format_name, bs->device_name, | |
1153 | entry->key); | |
b6ad491a KW |
1154 | |
1155 | ret = -EINVAL; | |
1156 | goto close_and_fail; | |
1157 | } | |
1158 | QDECREF(options); | |
1159 | ||
b6ce07aa | 1160 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1161 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1162 | } |
1163 | ||
1164 | return 0; | |
1165 | ||
1166 | unlink_and_fail: | |
f500a6d3 | 1167 | if (file != NULL) { |
4f6fd349 | 1168 | bdrv_unref(file); |
f500a6d3 | 1169 | } |
b6ce07aa KW |
1170 | if (bs->is_temporary) { |
1171 | unlink(filename); | |
1172 | } | |
de9c0cec KW |
1173 | fail: |
1174 | QDECREF(bs->options); | |
b6ad491a | 1175 | QDECREF(options); |
de9c0cec | 1176 | bs->options = NULL; |
34b5d2c6 MR |
1177 | if (error_is_set(&local_err)) { |
1178 | error_propagate(errp, local_err); | |
1179 | } | |
b6ad491a | 1180 | return ret; |
de9c0cec | 1181 | |
b6ad491a KW |
1182 | close_and_fail: |
1183 | bdrv_close(bs); | |
1184 | QDECREF(options); | |
34b5d2c6 MR |
1185 | if (error_is_set(&local_err)) { |
1186 | error_propagate(errp, local_err); | |
1187 | } | |
b6ce07aa KW |
1188 | return ret; |
1189 | } | |
1190 | ||
e971aa12 JC |
1191 | typedef struct BlockReopenQueueEntry { |
1192 | bool prepared; | |
1193 | BDRVReopenState state; | |
1194 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1195 | } BlockReopenQueueEntry; | |
1196 | ||
1197 | /* | |
1198 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1199 | * reopen of multiple devices. | |
1200 | * | |
1201 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1202 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1203 | * be created and initialized. This newly created BlockReopenQueue should be | |
1204 | * passed back in for subsequent calls that are intended to be of the same | |
1205 | * atomic 'set'. | |
1206 | * | |
1207 | * bs is the BlockDriverState to add to the reopen queue. | |
1208 | * | |
1209 | * flags contains the open flags for the associated bs | |
1210 | * | |
1211 | * returns a pointer to bs_queue, which is either the newly allocated | |
1212 | * bs_queue, or the existing bs_queue being used. | |
1213 | * | |
1214 | */ | |
1215 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1216 | BlockDriverState *bs, int flags) | |
1217 | { | |
1218 | assert(bs != NULL); | |
1219 | ||
1220 | BlockReopenQueueEntry *bs_entry; | |
1221 | if (bs_queue == NULL) { | |
1222 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1223 | QSIMPLEQ_INIT(bs_queue); | |
1224 | } | |
1225 | ||
1226 | if (bs->file) { | |
1227 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1228 | } | |
1229 | ||
1230 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1231 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1232 | ||
1233 | bs_entry->state.bs = bs; | |
1234 | bs_entry->state.flags = flags; | |
1235 | ||
1236 | return bs_queue; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1241 | * | |
1242 | * The queue passed in (bs_queue) must have been built up previous | |
1243 | * via bdrv_reopen_queue(). | |
1244 | * | |
1245 | * Reopens all BDS specified in the queue, with the appropriate | |
1246 | * flags. All devices are prepared for reopen, and failure of any | |
1247 | * device will cause all device changes to be abandonded, and intermediate | |
1248 | * data cleaned up. | |
1249 | * | |
1250 | * If all devices prepare successfully, then the changes are committed | |
1251 | * to all devices. | |
1252 | * | |
1253 | */ | |
1254 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1255 | { | |
1256 | int ret = -1; | |
1257 | BlockReopenQueueEntry *bs_entry, *next; | |
1258 | Error *local_err = NULL; | |
1259 | ||
1260 | assert(bs_queue != NULL); | |
1261 | ||
1262 | bdrv_drain_all(); | |
1263 | ||
1264 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1265 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1266 | error_propagate(errp, local_err); | |
1267 | goto cleanup; | |
1268 | } | |
1269 | bs_entry->prepared = true; | |
1270 | } | |
1271 | ||
1272 | /* If we reach this point, we have success and just need to apply the | |
1273 | * changes | |
1274 | */ | |
1275 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1276 | bdrv_reopen_commit(&bs_entry->state); | |
1277 | } | |
1278 | ||
1279 | ret = 0; | |
1280 | ||
1281 | cleanup: | |
1282 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1283 | if (ret && bs_entry->prepared) { | |
1284 | bdrv_reopen_abort(&bs_entry->state); | |
1285 | } | |
1286 | g_free(bs_entry); | |
1287 | } | |
1288 | g_free(bs_queue); | |
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | ||
1293 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1294 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1295 | { | |
1296 | int ret = -1; | |
1297 | Error *local_err = NULL; | |
1298 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1299 | ||
1300 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1301 | if (local_err != NULL) { | |
1302 | error_propagate(errp, local_err); | |
1303 | } | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | ||
1308 | /* | |
1309 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1310 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1311 | * the block driver layer .bdrv_reopen_prepare() | |
1312 | * | |
1313 | * bs is the BlockDriverState to reopen | |
1314 | * flags are the new open flags | |
1315 | * queue is the reopen queue | |
1316 | * | |
1317 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1318 | * as well. | |
1319 | * | |
1320 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1321 | * It is the responsibility of the caller to then call the abort() or | |
1322 | * commit() for any other BDS that have been left in a prepare() state | |
1323 | * | |
1324 | */ | |
1325 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1326 | Error **errp) | |
1327 | { | |
1328 | int ret = -1; | |
1329 | Error *local_err = NULL; | |
1330 | BlockDriver *drv; | |
1331 | ||
1332 | assert(reopen_state != NULL); | |
1333 | assert(reopen_state->bs->drv != NULL); | |
1334 | drv = reopen_state->bs->drv; | |
1335 | ||
1336 | /* if we are to stay read-only, do not allow permission change | |
1337 | * to r/w */ | |
1338 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1339 | reopen_state->flags & BDRV_O_RDWR) { | |
1340 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1341 | reopen_state->bs->device_name); | |
1342 | goto error; | |
1343 | } | |
1344 | ||
1345 | ||
1346 | ret = bdrv_flush(reopen_state->bs); | |
1347 | if (ret) { | |
1348 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1349 | strerror(-ret)); | |
1350 | goto error; | |
1351 | } | |
1352 | ||
1353 | if (drv->bdrv_reopen_prepare) { | |
1354 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1355 | if (ret) { | |
1356 | if (local_err != NULL) { | |
1357 | error_propagate(errp, local_err); | |
1358 | } else { | |
d8b6895f LC |
1359 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1360 | reopen_state->bs->filename); | |
e971aa12 JC |
1361 | } |
1362 | goto error; | |
1363 | } | |
1364 | } else { | |
1365 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1366 | * handler for each supported drv. */ | |
1367 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1368 | drv->format_name, reopen_state->bs->device_name, | |
1369 | "reopening of file"); | |
1370 | ret = -1; | |
1371 | goto error; | |
1372 | } | |
1373 | ||
1374 | ret = 0; | |
1375 | ||
1376 | error: | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1382 | * makes them final by swapping the staging BlockDriverState contents into | |
1383 | * the active BlockDriverState contents. | |
1384 | */ | |
1385 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1386 | { | |
1387 | BlockDriver *drv; | |
1388 | ||
1389 | assert(reopen_state != NULL); | |
1390 | drv = reopen_state->bs->drv; | |
1391 | assert(drv != NULL); | |
1392 | ||
1393 | /* If there are any driver level actions to take */ | |
1394 | if (drv->bdrv_reopen_commit) { | |
1395 | drv->bdrv_reopen_commit(reopen_state); | |
1396 | } | |
1397 | ||
1398 | /* set BDS specific flags now */ | |
1399 | reopen_state->bs->open_flags = reopen_state->flags; | |
1400 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1401 | BDRV_O_CACHE_WB); | |
1402 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * Abort the reopen, and delete and free the staged changes in | |
1407 | * reopen_state | |
1408 | */ | |
1409 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1410 | { | |
1411 | BlockDriver *drv; | |
1412 | ||
1413 | assert(reopen_state != NULL); | |
1414 | drv = reopen_state->bs->drv; | |
1415 | assert(drv != NULL); | |
1416 | ||
1417 | if (drv->bdrv_reopen_abort) { | |
1418 | drv->bdrv_reopen_abort(reopen_state); | |
1419 | } | |
1420 | } | |
1421 | ||
1422 | ||
fc01f7e7 FB |
1423 | void bdrv_close(BlockDriverState *bs) |
1424 | { | |
3cbc002c PB |
1425 | if (bs->job) { |
1426 | block_job_cancel_sync(bs->job); | |
1427 | } | |
58fda173 SH |
1428 | bdrv_drain_all(); /* complete I/O */ |
1429 | bdrv_flush(bs); | |
1430 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1431 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1432 | |
3cbc002c | 1433 | if (bs->drv) { |
557df6ac | 1434 | if (bs->backing_hd) { |
4f6fd349 | 1435 | bdrv_unref(bs->backing_hd); |
557df6ac SH |
1436 | bs->backing_hd = NULL; |
1437 | } | |
ea2384d3 | 1438 | bs->drv->bdrv_close(bs); |
7267c094 | 1439 | g_free(bs->opaque); |
ea2384d3 FB |
1440 | #ifdef _WIN32 |
1441 | if (bs->is_temporary) { | |
1442 | unlink(bs->filename); | |
1443 | } | |
67b915a5 | 1444 | #endif |
ea2384d3 FB |
1445 | bs->opaque = NULL; |
1446 | bs->drv = NULL; | |
53fec9d3 | 1447 | bs->copy_on_read = 0; |
a275fa42 PB |
1448 | bs->backing_file[0] = '\0'; |
1449 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1450 | bs->total_sectors = 0; |
1451 | bs->encrypted = 0; | |
1452 | bs->valid_key = 0; | |
1453 | bs->sg = 0; | |
1454 | bs->growable = 0; | |
0d51b4de | 1455 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1456 | QDECREF(bs->options); |
1457 | bs->options = NULL; | |
b338082b | 1458 | |
66f82cee | 1459 | if (bs->file != NULL) { |
4f6fd349 | 1460 | bdrv_unref(bs->file); |
0ac9377d | 1461 | bs->file = NULL; |
66f82cee | 1462 | } |
b338082b | 1463 | } |
98f90dba | 1464 | |
9ca11154 PH |
1465 | bdrv_dev_change_media_cb(bs, false); |
1466 | ||
98f90dba ZYW |
1467 | /*throttling disk I/O limits*/ |
1468 | if (bs->io_limits_enabled) { | |
1469 | bdrv_io_limits_disable(bs); | |
1470 | } | |
b338082b FB |
1471 | } |
1472 | ||
2bc93fed MK |
1473 | void bdrv_close_all(void) |
1474 | { | |
1475 | BlockDriverState *bs; | |
1476 | ||
1477 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1478 | bdrv_close(bs); | |
1479 | } | |
1480 | } | |
1481 | ||
88266f5a SH |
1482 | /* Check if any requests are in-flight (including throttled requests) */ |
1483 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1484 | { | |
1485 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1486 | return true; | |
1487 | } | |
cc0681c4 BC |
1488 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1489 | return true; | |
1490 | } | |
1491 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1492 | return true; |
1493 | } | |
1494 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1495 | return true; | |
1496 | } | |
1497 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1498 | return true; | |
1499 | } | |
1500 | return false; | |
1501 | } | |
1502 | ||
1503 | static bool bdrv_requests_pending_all(void) | |
1504 | { | |
1505 | BlockDriverState *bs; | |
1506 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1507 | if (bdrv_requests_pending(bs)) { | |
1508 | return true; | |
1509 | } | |
1510 | } | |
1511 | return false; | |
1512 | } | |
1513 | ||
922453bc SH |
1514 | /* |
1515 | * Wait for pending requests to complete across all BlockDriverStates | |
1516 | * | |
1517 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1518 | * after calling this function. | |
4c355d53 ZYW |
1519 | * |
1520 | * Note that completion of an asynchronous I/O operation can trigger any | |
1521 | * number of other I/O operations on other devices---for example a coroutine | |
1522 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1523 | * coroutine is complete. Because of this, it is not possible to have a | |
1524 | * function to drain a single device's I/O queue. | |
922453bc SH |
1525 | */ |
1526 | void bdrv_drain_all(void) | |
1527 | { | |
88266f5a SH |
1528 | /* Always run first iteration so any pending completion BHs run */ |
1529 | bool busy = true; | |
922453bc SH |
1530 | BlockDriverState *bs; |
1531 | ||
88266f5a | 1532 | while (busy) { |
4c355d53 ZYW |
1533 | /* FIXME: We do not have timer support here, so this is effectively |
1534 | * a busy wait. | |
1535 | */ | |
1536 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
cc0681c4 | 1537 | if (bdrv_start_throttled_reqs(bs)) { |
4c355d53 ZYW |
1538 | busy = true; |
1539 | } | |
1540 | } | |
922453bc | 1541 | |
88266f5a SH |
1542 | busy = bdrv_requests_pending_all(); |
1543 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1544 | } |
1545 | } | |
1546 | ||
d22b2f41 RH |
1547 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1548 | Also, NULL terminate the device_name to prevent double remove */ | |
1549 | void bdrv_make_anon(BlockDriverState *bs) | |
1550 | { | |
1551 | if (bs->device_name[0] != '\0') { | |
1552 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1553 | } | |
1554 | bs->device_name[0] = '\0'; | |
1555 | } | |
1556 | ||
e023b2e2 PB |
1557 | static void bdrv_rebind(BlockDriverState *bs) |
1558 | { | |
1559 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1560 | bs->drv->bdrv_rebind(bs); | |
1561 | } | |
1562 | } | |
1563 | ||
4ddc07ca PB |
1564 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1565 | BlockDriverState *bs_src) | |
8802d1fd | 1566 | { |
4ddc07ca PB |
1567 | /* move some fields that need to stay attached to the device */ |
1568 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1569 | |
1570 | /* dev info */ | |
4ddc07ca PB |
1571 | bs_dest->dev_ops = bs_src->dev_ops; |
1572 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1573 | bs_dest->dev = bs_src->dev; | |
1574 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1575 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1576 | |
4ddc07ca | 1577 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1578 | |
cc0681c4 BC |
1579 | /* i/o throttled req */ |
1580 | memcpy(&bs_dest->throttle_state, | |
1581 | &bs_src->throttle_state, | |
1582 | sizeof(ThrottleState)); | |
1583 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1584 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1585 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1586 | |
8802d1fd | 1587 | /* r/w error */ |
4ddc07ca PB |
1588 | bs_dest->on_read_error = bs_src->on_read_error; |
1589 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1590 | |
1591 | /* i/o status */ | |
4ddc07ca PB |
1592 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1593 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1594 | |
a9fc4408 | 1595 | /* dirty bitmap */ |
4ddc07ca | 1596 | bs_dest->dirty_bitmap = bs_src->dirty_bitmap; |
a9fc4408 | 1597 | |
9fcb0251 FZ |
1598 | /* reference count */ |
1599 | bs_dest->refcnt = bs_src->refcnt; | |
1600 | ||
a9fc4408 | 1601 | /* job */ |
4ddc07ca PB |
1602 | bs_dest->in_use = bs_src->in_use; |
1603 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1604 | |
8802d1fd | 1605 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1606 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1607 | bs_src->device_name); | |
1608 | bs_dest->list = bs_src->list; | |
1609 | } | |
8802d1fd | 1610 | |
4ddc07ca PB |
1611 | /* |
1612 | * Swap bs contents for two image chains while they are live, | |
1613 | * while keeping required fields on the BlockDriverState that is | |
1614 | * actually attached to a device. | |
1615 | * | |
1616 | * This will modify the BlockDriverState fields, and swap contents | |
1617 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1618 | * | |
1619 | * bs_new is required to be anonymous. | |
1620 | * | |
1621 | * This function does not create any image files. | |
1622 | */ | |
1623 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1624 | { | |
1625 | BlockDriverState tmp; | |
f6801b83 | 1626 | |
4ddc07ca PB |
1627 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1628 | assert(bs_new->device_name[0] == '\0'); | |
1629 | assert(bs_new->dirty_bitmap == NULL); | |
1630 | assert(bs_new->job == NULL); | |
1631 | assert(bs_new->dev == NULL); | |
1632 | assert(bs_new->in_use == 0); | |
1633 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1634 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 1635 | |
4ddc07ca PB |
1636 | tmp = *bs_new; |
1637 | *bs_new = *bs_old; | |
1638 | *bs_old = tmp; | |
a9fc4408 | 1639 | |
4ddc07ca PB |
1640 | /* there are some fields that should not be swapped, move them back */ |
1641 | bdrv_move_feature_fields(&tmp, bs_old); | |
1642 | bdrv_move_feature_fields(bs_old, bs_new); | |
1643 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1644 | |
4ddc07ca PB |
1645 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1646 | assert(bs_new->device_name[0] == '\0'); | |
1647 | ||
1648 | /* Check a few fields that should remain attached to the device */ | |
1649 | assert(bs_new->dev == NULL); | |
1650 | assert(bs_new->job == NULL); | |
1651 | assert(bs_new->in_use == 0); | |
1652 | assert(bs_new->io_limits_enabled == false); | |
cc0681c4 | 1653 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 PB |
1654 | |
1655 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1656 | bdrv_rebind(bs_old); |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * Add new bs contents at the top of an image chain while the chain is | |
1661 | * live, while keeping required fields on the top layer. | |
1662 | * | |
1663 | * This will modify the BlockDriverState fields, and swap contents | |
1664 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1665 | * | |
1666 | * bs_new is required to be anonymous. | |
1667 | * | |
1668 | * This function does not create any image files. | |
1669 | */ | |
1670 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1671 | { | |
1672 | bdrv_swap(bs_new, bs_top); | |
1673 | ||
1674 | /* The contents of 'tmp' will become bs_top, as we are | |
1675 | * swapping bs_new and bs_top contents. */ | |
1676 | bs_top->backing_hd = bs_new; | |
1677 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1678 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1679 | bs_new->filename); | |
1680 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1681 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1682 | } |
1683 | ||
4f6fd349 | 1684 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 1685 | { |
fa879d62 | 1686 | assert(!bs->dev); |
3e914655 PB |
1687 | assert(!bs->job); |
1688 | assert(!bs->in_use); | |
4f6fd349 | 1689 | assert(!bs->refcnt); |
18846dee | 1690 | |
e1b5c52e SH |
1691 | bdrv_close(bs); |
1692 | ||
1b7bdbc1 | 1693 | /* remove from list, if necessary */ |
d22b2f41 | 1694 | bdrv_make_anon(bs); |
34c6f050 | 1695 | |
7267c094 | 1696 | g_free(bs); |
fc01f7e7 FB |
1697 | } |
1698 | ||
fa879d62 MA |
1699 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1700 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1701 | { |
fa879d62 | 1702 | if (bs->dev) { |
18846dee MA |
1703 | return -EBUSY; |
1704 | } | |
fa879d62 | 1705 | bs->dev = dev; |
28a7282a | 1706 | bdrv_iostatus_reset(bs); |
18846dee MA |
1707 | return 0; |
1708 | } | |
1709 | ||
fa879d62 MA |
1710 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1711 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1712 | { |
fa879d62 MA |
1713 | if (bdrv_attach_dev(bs, dev) < 0) { |
1714 | abort(); | |
1715 | } | |
1716 | } | |
1717 | ||
1718 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1719 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1720 | { | |
1721 | assert(bs->dev == dev); | |
1722 | bs->dev = NULL; | |
0e49de52 MA |
1723 | bs->dev_ops = NULL; |
1724 | bs->dev_opaque = NULL; | |
29e05f20 | 1725 | bs->buffer_alignment = 512; |
18846dee MA |
1726 | } |
1727 | ||
fa879d62 MA |
1728 | /* TODO change to return DeviceState * when all users are qdevified */ |
1729 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1730 | { |
fa879d62 | 1731 | return bs->dev; |
18846dee MA |
1732 | } |
1733 | ||
0e49de52 MA |
1734 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1735 | void *opaque) | |
1736 | { | |
1737 | bs->dev_ops = ops; | |
1738 | bs->dev_opaque = opaque; | |
1739 | } | |
1740 | ||
32c81a4a PB |
1741 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1742 | enum MonitorEvent ev, | |
1743 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1744 | { |
1745 | QObject *data; | |
1746 | const char *action_str; | |
1747 | ||
1748 | switch (action) { | |
1749 | case BDRV_ACTION_REPORT: | |
1750 | action_str = "report"; | |
1751 | break; | |
1752 | case BDRV_ACTION_IGNORE: | |
1753 | action_str = "ignore"; | |
1754 | break; | |
1755 | case BDRV_ACTION_STOP: | |
1756 | action_str = "stop"; | |
1757 | break; | |
1758 | default: | |
1759 | abort(); | |
1760 | } | |
1761 | ||
1762 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1763 | bdrv->device_name, | |
1764 | action_str, | |
1765 | is_read ? "read" : "write"); | |
32c81a4a | 1766 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1767 | |
1768 | qobject_decref(data); | |
1769 | } | |
1770 | ||
6f382ed2 LC |
1771 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1772 | { | |
1773 | QObject *data; | |
1774 | ||
1775 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1776 | bdrv_get_device_name(bs), ejected); | |
1777 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1778 | ||
1779 | qobject_decref(data); | |
1780 | } | |
1781 | ||
7d4b4ba5 | 1782 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1783 | { |
145feb17 | 1784 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1785 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1786 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1787 | if (tray_was_closed) { |
1788 | /* tray open */ | |
1789 | bdrv_emit_qmp_eject_event(bs, true); | |
1790 | } | |
1791 | if (load) { | |
1792 | /* tray close */ | |
1793 | bdrv_emit_qmp_eject_event(bs, false); | |
1794 | } | |
145feb17 MA |
1795 | } |
1796 | } | |
1797 | ||
2c6942fa MA |
1798 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1799 | { | |
1800 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1801 | } | |
1802 | ||
025ccaa7 PB |
1803 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1804 | { | |
1805 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1806 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1807 | } | |
1808 | } | |
1809 | ||
e4def80b MA |
1810 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1811 | { | |
1812 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1813 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1814 | } | |
1815 | return false; | |
1816 | } | |
1817 | ||
145feb17 MA |
1818 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1819 | { | |
1820 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1821 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1822 | } |
1823 | } | |
1824 | ||
f107639a MA |
1825 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1826 | { | |
1827 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1828 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1829 | } | |
1830 | return false; | |
1831 | } | |
1832 | ||
e97fc193 AL |
1833 | /* |
1834 | * Run consistency checks on an image | |
1835 | * | |
e076f338 | 1836 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1837 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1838 | * check are stored in res. |
e97fc193 | 1839 | */ |
4534ff54 | 1840 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1841 | { |
1842 | if (bs->drv->bdrv_check == NULL) { | |
1843 | return -ENOTSUP; | |
1844 | } | |
1845 | ||
e076f338 | 1846 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1847 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1848 | } |
1849 | ||
8a426614 KW |
1850 | #define COMMIT_BUF_SECTORS 2048 |
1851 | ||
33e3963e FB |
1852 | /* commit COW file into the raw image */ |
1853 | int bdrv_commit(BlockDriverState *bs) | |
1854 | { | |
19cb3738 | 1855 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1856 | int64_t sector, total_sectors; |
1857 | int n, ro, open_flags; | |
0bce597d | 1858 | int ret = 0; |
8a426614 | 1859 | uint8_t *buf; |
c2cba3d9 | 1860 | char filename[PATH_MAX]; |
33e3963e | 1861 | |
19cb3738 FB |
1862 | if (!drv) |
1863 | return -ENOMEDIUM; | |
4dca4b63 NS |
1864 | |
1865 | if (!bs->backing_hd) { | |
1866 | return -ENOTSUP; | |
33e3963e FB |
1867 | } |
1868 | ||
2d3735d3 SH |
1869 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1870 | return -EBUSY; | |
1871 | } | |
1872 | ||
4dca4b63 | 1873 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
1874 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
1875 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
1876 | open_flags = bs->backing_hd->open_flags; |
1877 | ||
1878 | if (ro) { | |
0bce597d JC |
1879 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
1880 | return -EACCES; | |
4dca4b63 | 1881 | } |
ea2384d3 | 1882 | } |
33e3963e | 1883 | |
6ea44308 | 1884 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1885 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1886 | |
1887 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
1888 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
1889 | if (ret < 0) { | |
1890 | goto ro_cleanup; | |
1891 | } | |
1892 | if (ret) { | |
8a426614 KW |
1893 | if (bdrv_read(bs, sector, buf, n) != 0) { |
1894 | ret = -EIO; | |
1895 | goto ro_cleanup; | |
1896 | } | |
1897 | ||
1898 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1899 | ret = -EIO; | |
1900 | goto ro_cleanup; | |
1901 | } | |
ea2384d3 | 1902 | } |
33e3963e | 1903 | } |
95389c86 | 1904 | |
1d44952f CH |
1905 | if (drv->bdrv_make_empty) { |
1906 | ret = drv->bdrv_make_empty(bs); | |
1907 | bdrv_flush(bs); | |
1908 | } | |
95389c86 | 1909 | |
3f5075ae CH |
1910 | /* |
1911 | * Make sure all data we wrote to the backing device is actually | |
1912 | * stable on disk. | |
1913 | */ | |
1914 | if (bs->backing_hd) | |
1915 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1916 | |
1917 | ro_cleanup: | |
7267c094 | 1918 | g_free(buf); |
4dca4b63 NS |
1919 | |
1920 | if (ro) { | |
0bce597d JC |
1921 | /* ignoring error return here */ |
1922 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
1923 | } |
1924 | ||
1d44952f | 1925 | return ret; |
33e3963e FB |
1926 | } |
1927 | ||
e8877497 | 1928 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1929 | { |
1930 | BlockDriverState *bs; | |
1931 | ||
1932 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
272d2d8e JC |
1933 | if (bs->drv && bs->backing_hd) { |
1934 | int ret = bdrv_commit(bs); | |
1935 | if (ret < 0) { | |
1936 | return ret; | |
1937 | } | |
e8877497 | 1938 | } |
6ab4b5ab | 1939 | } |
e8877497 | 1940 | return 0; |
6ab4b5ab MA |
1941 | } |
1942 | ||
dbffbdcf SH |
1943 | /** |
1944 | * Remove an active request from the tracked requests list | |
1945 | * | |
1946 | * This function should be called when a tracked request is completing. | |
1947 | */ | |
1948 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1949 | { | |
1950 | QLIST_REMOVE(req, list); | |
f4658285 | 1951 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1952 | } |
1953 | ||
1954 | /** | |
1955 | * Add an active request to the tracked requests list | |
1956 | */ | |
1957 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1958 | BlockDriverState *bs, | |
1959 | int64_t sector_num, | |
1960 | int nb_sectors, bool is_write) | |
1961 | { | |
1962 | *req = (BdrvTrackedRequest){ | |
1963 | .bs = bs, | |
1964 | .sector_num = sector_num, | |
1965 | .nb_sectors = nb_sectors, | |
1966 | .is_write = is_write, | |
5f8b6491 | 1967 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1968 | }; |
1969 | ||
f4658285 SH |
1970 | qemu_co_queue_init(&req->wait_queue); |
1971 | ||
dbffbdcf SH |
1972 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1973 | } | |
1974 | ||
d83947ac SH |
1975 | /** |
1976 | * Round a region to cluster boundaries | |
1977 | */ | |
343bded4 PB |
1978 | void bdrv_round_to_clusters(BlockDriverState *bs, |
1979 | int64_t sector_num, int nb_sectors, | |
1980 | int64_t *cluster_sector_num, | |
1981 | int *cluster_nb_sectors) | |
d83947ac SH |
1982 | { |
1983 | BlockDriverInfo bdi; | |
1984 | ||
1985 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1986 | *cluster_sector_num = sector_num; | |
1987 | *cluster_nb_sectors = nb_sectors; | |
1988 | } else { | |
1989 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1990 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1991 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1992 | nb_sectors, c); | |
1993 | } | |
1994 | } | |
1995 | ||
f4658285 SH |
1996 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1997 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1998 | /* aaaa bbbb */ |
1999 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
2000 | return false; | |
2001 | } | |
2002 | /* bbbb aaaa */ | |
2003 | if (req->sector_num >= sector_num + nb_sectors) { | |
2004 | return false; | |
2005 | } | |
2006 | return true; | |
f4658285 SH |
2007 | } |
2008 | ||
2009 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
2010 | int64_t sector_num, int nb_sectors) | |
2011 | { | |
2012 | BdrvTrackedRequest *req; | |
d83947ac SH |
2013 | int64_t cluster_sector_num; |
2014 | int cluster_nb_sectors; | |
f4658285 SH |
2015 | bool retry; |
2016 | ||
d83947ac SH |
2017 | /* If we touch the same cluster it counts as an overlap. This guarantees |
2018 | * that allocating writes will be serialized and not race with each other | |
2019 | * for the same cluster. For example, in copy-on-read it ensures that the | |
2020 | * CoR read and write operations are atomic and guest writes cannot | |
2021 | * interleave between them. | |
2022 | */ | |
343bded4 PB |
2023 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2024 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 2025 | |
f4658285 SH |
2026 | do { |
2027 | retry = false; | |
2028 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
2029 | if (tracked_request_overlaps(req, cluster_sector_num, |
2030 | cluster_nb_sectors)) { | |
5f8b6491 SH |
2031 | /* Hitting this means there was a reentrant request, for |
2032 | * example, a block driver issuing nested requests. This must | |
2033 | * never happen since it means deadlock. | |
2034 | */ | |
2035 | assert(qemu_coroutine_self() != req->co); | |
2036 | ||
f4658285 SH |
2037 | qemu_co_queue_wait(&req->wait_queue); |
2038 | retry = true; | |
2039 | break; | |
2040 | } | |
2041 | } | |
2042 | } while (retry); | |
2043 | } | |
2044 | ||
756e6736 KW |
2045 | /* |
2046 | * Return values: | |
2047 | * 0 - success | |
2048 | * -EINVAL - backing format specified, but no file | |
2049 | * -ENOSPC - can't update the backing file because no space is left in the | |
2050 | * image file header | |
2051 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2052 | */ | |
2053 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2054 | const char *backing_file, const char *backing_fmt) | |
2055 | { | |
2056 | BlockDriver *drv = bs->drv; | |
469ef350 | 2057 | int ret; |
756e6736 | 2058 | |
5f377794 PB |
2059 | /* Backing file format doesn't make sense without a backing file */ |
2060 | if (backing_fmt && !backing_file) { | |
2061 | return -EINVAL; | |
2062 | } | |
2063 | ||
756e6736 | 2064 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2065 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2066 | } else { |
469ef350 | 2067 | ret = -ENOTSUP; |
756e6736 | 2068 | } |
469ef350 PB |
2069 | |
2070 | if (ret == 0) { | |
2071 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2072 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2073 | } | |
2074 | return ret; | |
756e6736 KW |
2075 | } |
2076 | ||
6ebdcee2 JC |
2077 | /* |
2078 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2079 | * | |
2080 | * active is the current topmost image. | |
2081 | * | |
2082 | * Returns NULL if bs is not found in active's image chain, | |
2083 | * or if active == bs. | |
2084 | */ | |
2085 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2086 | BlockDriverState *bs) | |
2087 | { | |
2088 | BlockDriverState *overlay = NULL; | |
2089 | BlockDriverState *intermediate; | |
2090 | ||
2091 | assert(active != NULL); | |
2092 | assert(bs != NULL); | |
2093 | ||
2094 | /* if bs is the same as active, then by definition it has no overlay | |
2095 | */ | |
2096 | if (active == bs) { | |
2097 | return NULL; | |
2098 | } | |
2099 | ||
2100 | intermediate = active; | |
2101 | while (intermediate->backing_hd) { | |
2102 | if (intermediate->backing_hd == bs) { | |
2103 | overlay = intermediate; | |
2104 | break; | |
2105 | } | |
2106 | intermediate = intermediate->backing_hd; | |
2107 | } | |
2108 | ||
2109 | return overlay; | |
2110 | } | |
2111 | ||
2112 | typedef struct BlkIntermediateStates { | |
2113 | BlockDriverState *bs; | |
2114 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2115 | } BlkIntermediateStates; | |
2116 | ||
2117 | ||
2118 | /* | |
2119 | * Drops images above 'base' up to and including 'top', and sets the image | |
2120 | * above 'top' to have base as its backing file. | |
2121 | * | |
2122 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2123 | * information in 'bs' can be properly updated. | |
2124 | * | |
2125 | * E.g., this will convert the following chain: | |
2126 | * bottom <- base <- intermediate <- top <- active | |
2127 | * | |
2128 | * to | |
2129 | * | |
2130 | * bottom <- base <- active | |
2131 | * | |
2132 | * It is allowed for bottom==base, in which case it converts: | |
2133 | * | |
2134 | * base <- intermediate <- top <- active | |
2135 | * | |
2136 | * to | |
2137 | * | |
2138 | * base <- active | |
2139 | * | |
2140 | * Error conditions: | |
2141 | * if active == top, that is considered an error | |
2142 | * | |
2143 | */ | |
2144 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2145 | BlockDriverState *base) | |
2146 | { | |
2147 | BlockDriverState *intermediate; | |
2148 | BlockDriverState *base_bs = NULL; | |
2149 | BlockDriverState *new_top_bs = NULL; | |
2150 | BlkIntermediateStates *intermediate_state, *next; | |
2151 | int ret = -EIO; | |
2152 | ||
2153 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2154 | QSIMPLEQ_INIT(&states_to_delete); | |
2155 | ||
2156 | if (!top->drv || !base->drv) { | |
2157 | goto exit; | |
2158 | } | |
2159 | ||
2160 | new_top_bs = bdrv_find_overlay(active, top); | |
2161 | ||
2162 | if (new_top_bs == NULL) { | |
2163 | /* we could not find the image above 'top', this is an error */ | |
2164 | goto exit; | |
2165 | } | |
2166 | ||
2167 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2168 | * to do, no intermediate images */ | |
2169 | if (new_top_bs->backing_hd == base) { | |
2170 | ret = 0; | |
2171 | goto exit; | |
2172 | } | |
2173 | ||
2174 | intermediate = top; | |
2175 | ||
2176 | /* now we will go down through the list, and add each BDS we find | |
2177 | * into our deletion queue, until we hit the 'base' | |
2178 | */ | |
2179 | while (intermediate) { | |
2180 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2181 | intermediate_state->bs = intermediate; | |
2182 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2183 | ||
2184 | if (intermediate->backing_hd == base) { | |
2185 | base_bs = intermediate->backing_hd; | |
2186 | break; | |
2187 | } | |
2188 | intermediate = intermediate->backing_hd; | |
2189 | } | |
2190 | if (base_bs == NULL) { | |
2191 | /* something went wrong, we did not end at the base. safely | |
2192 | * unravel everything, and exit with error */ | |
2193 | goto exit; | |
2194 | } | |
2195 | ||
2196 | /* success - we can delete the intermediate states, and link top->base */ | |
2197 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2198 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2199 | if (ret) { | |
2200 | goto exit; | |
2201 | } | |
2202 | new_top_bs->backing_hd = base_bs; | |
2203 | ||
2204 | ||
2205 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2206 | /* so that bdrv_close() does not recursively close the chain */ | |
2207 | intermediate_state->bs->backing_hd = NULL; | |
4f6fd349 | 2208 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2209 | } |
2210 | ret = 0; | |
2211 | ||
2212 | exit: | |
2213 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2214 | g_free(intermediate_state); | |
2215 | } | |
2216 | return ret; | |
2217 | } | |
2218 | ||
2219 | ||
71d0770c AL |
2220 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2221 | size_t size) | |
2222 | { | |
2223 | int64_t len; | |
2224 | ||
2225 | if (!bdrv_is_inserted(bs)) | |
2226 | return -ENOMEDIUM; | |
2227 | ||
2228 | if (bs->growable) | |
2229 | return 0; | |
2230 | ||
2231 | len = bdrv_getlength(bs); | |
2232 | ||
fbb7b4e0 KW |
2233 | if (offset < 0) |
2234 | return -EIO; | |
2235 | ||
2236 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2237 | return -EIO; |
2238 | ||
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2243 | int nb_sectors) | |
2244 | { | |
eb5a3165 JS |
2245 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2246 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2247 | } |
2248 | ||
1c9805a3 SH |
2249 | typedef struct RwCo { |
2250 | BlockDriverState *bs; | |
2251 | int64_t sector_num; | |
2252 | int nb_sectors; | |
2253 | QEMUIOVector *qiov; | |
2254 | bool is_write; | |
2255 | int ret; | |
4105eaaa | 2256 | BdrvRequestFlags flags; |
1c9805a3 SH |
2257 | } RwCo; |
2258 | ||
2259 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2260 | { |
1c9805a3 | 2261 | RwCo *rwco = opaque; |
ea2384d3 | 2262 | |
1c9805a3 SH |
2263 | if (!rwco->is_write) { |
2264 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2265 | rwco->nb_sectors, rwco->qiov, |
2266 | rwco->flags); | |
1c9805a3 SH |
2267 | } else { |
2268 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
4105eaaa PL |
2269 | rwco->nb_sectors, rwco->qiov, |
2270 | rwco->flags); | |
1c9805a3 SH |
2271 | } |
2272 | } | |
e7a8a783 | 2273 | |
1c9805a3 | 2274 | /* |
8d3b1a2d | 2275 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2276 | */ |
8d3b1a2d | 2277 | static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num, |
4105eaaa PL |
2278 | QEMUIOVector *qiov, bool is_write, |
2279 | BdrvRequestFlags flags) | |
1c9805a3 | 2280 | { |
1c9805a3 SH |
2281 | Coroutine *co; |
2282 | RwCo rwco = { | |
2283 | .bs = bs, | |
2284 | .sector_num = sector_num, | |
8d3b1a2d KW |
2285 | .nb_sectors = qiov->size >> BDRV_SECTOR_BITS, |
2286 | .qiov = qiov, | |
1c9805a3 SH |
2287 | .is_write = is_write, |
2288 | .ret = NOT_DONE, | |
4105eaaa | 2289 | .flags = flags, |
1c9805a3 | 2290 | }; |
8d3b1a2d | 2291 | assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0); |
e7a8a783 | 2292 | |
498e386c ZYW |
2293 | /** |
2294 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2295 | * will not fire; so the I/O throttling function has to be disabled here | |
2296 | * if it has been enabled. | |
2297 | */ | |
2298 | if (bs->io_limits_enabled) { | |
2299 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2300 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2301 | bdrv_io_limits_disable(bs); | |
2302 | } | |
2303 | ||
1c9805a3 SH |
2304 | if (qemu_in_coroutine()) { |
2305 | /* Fast-path if already in coroutine context */ | |
2306 | bdrv_rw_co_entry(&rwco); | |
2307 | } else { | |
2308 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2309 | qemu_coroutine_enter(co, &rwco); | |
2310 | while (rwco.ret == NOT_DONE) { | |
2311 | qemu_aio_wait(); | |
2312 | } | |
2313 | } | |
2314 | return rwco.ret; | |
2315 | } | |
b338082b | 2316 | |
8d3b1a2d KW |
2317 | /* |
2318 | * Process a synchronous request using coroutines | |
2319 | */ | |
2320 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2321 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2322 | { |
2323 | QEMUIOVector qiov; | |
2324 | struct iovec iov = { | |
2325 | .iov_base = (void *)buf, | |
2326 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2327 | }; | |
2328 | ||
2329 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4105eaaa | 2330 | return bdrv_rwv_co(bs, sector_num, &qiov, is_write, flags); |
8d3b1a2d KW |
2331 | } |
2332 | ||
1c9805a3 SH |
2333 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2334 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2335 | uint8_t *buf, int nb_sectors) | |
2336 | { | |
4105eaaa | 2337 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2338 | } |
2339 | ||
07d27a44 MA |
2340 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2341 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2342 | uint8_t *buf, int nb_sectors) | |
2343 | { | |
2344 | bool enabled; | |
2345 | int ret; | |
2346 | ||
2347 | enabled = bs->io_limits_enabled; | |
2348 | bs->io_limits_enabled = false; | |
4e7395e8 | 2349 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2350 | bs->io_limits_enabled = enabled; |
2351 | return ret; | |
2352 | } | |
2353 | ||
5fafdf24 | 2354 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2355 | -EIO generic I/O error (may happen for all errors) |
2356 | -ENOMEDIUM No media inserted. | |
2357 | -EINVAL Invalid sector number or nb_sectors | |
2358 | -EACCES Trying to write a read-only device | |
2359 | */ | |
5fafdf24 | 2360 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2361 | const uint8_t *buf, int nb_sectors) |
2362 | { | |
4105eaaa | 2363 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2364 | } |
2365 | ||
8d3b1a2d KW |
2366 | int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov) |
2367 | { | |
4105eaaa PL |
2368 | return bdrv_rwv_co(bs, sector_num, qiov, true, 0); |
2369 | } | |
2370 | ||
2371 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
2372 | { | |
2373 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
2374 | BDRV_REQ_ZERO_WRITE); | |
8d3b1a2d KW |
2375 | } |
2376 | ||
eda578e5 AL |
2377 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2378 | void *buf, int count1) | |
83f64091 | 2379 | { |
6ea44308 | 2380 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2381 | int len, nb_sectors, count; |
2382 | int64_t sector_num; | |
9a8c4cce | 2383 | int ret; |
83f64091 FB |
2384 | |
2385 | count = count1; | |
2386 | /* first read to align to sector start */ | |
6ea44308 | 2387 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2388 | if (len > count) |
2389 | len = count; | |
6ea44308 | 2390 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2391 | if (len > 0) { |
9a8c4cce KW |
2392 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2393 | return ret; | |
6ea44308 | 2394 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2395 | count -= len; |
2396 | if (count == 0) | |
2397 | return count1; | |
2398 | sector_num++; | |
2399 | buf += len; | |
2400 | } | |
2401 | ||
2402 | /* read the sectors "in place" */ | |
6ea44308 | 2403 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2404 | if (nb_sectors > 0) { |
9a8c4cce KW |
2405 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2406 | return ret; | |
83f64091 | 2407 | sector_num += nb_sectors; |
6ea44308 | 2408 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2409 | buf += len; |
2410 | count -= len; | |
2411 | } | |
2412 | ||
2413 | /* add data from the last sector */ | |
2414 | if (count > 0) { | |
9a8c4cce KW |
2415 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2416 | return ret; | |
83f64091 FB |
2417 | memcpy(buf, tmp_buf, count); |
2418 | } | |
2419 | return count1; | |
2420 | } | |
2421 | ||
8d3b1a2d | 2422 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2423 | { |
6ea44308 | 2424 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2425 | int len, nb_sectors, count; |
2426 | int64_t sector_num; | |
9a8c4cce | 2427 | int ret; |
83f64091 | 2428 | |
8d3b1a2d KW |
2429 | count = qiov->size; |
2430 | ||
83f64091 | 2431 | /* first write to align to sector start */ |
6ea44308 | 2432 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2433 | if (len > count) |
2434 | len = count; | |
6ea44308 | 2435 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2436 | if (len > 0) { |
9a8c4cce KW |
2437 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2438 | return ret; | |
8d3b1a2d KW |
2439 | qemu_iovec_to_buf(qiov, 0, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), |
2440 | len); | |
9a8c4cce KW |
2441 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2442 | return ret; | |
83f64091 FB |
2443 | count -= len; |
2444 | if (count == 0) | |
8d3b1a2d | 2445 | return qiov->size; |
83f64091 | 2446 | sector_num++; |
83f64091 FB |
2447 | } |
2448 | ||
2449 | /* write the sectors "in place" */ | |
6ea44308 | 2450 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2451 | if (nb_sectors > 0) { |
8d3b1a2d KW |
2452 | QEMUIOVector qiov_inplace; |
2453 | ||
2454 | qemu_iovec_init(&qiov_inplace, qiov->niov); | |
2455 | qemu_iovec_concat(&qiov_inplace, qiov, len, | |
2456 | nb_sectors << BDRV_SECTOR_BITS); | |
2457 | ret = bdrv_writev(bs, sector_num, &qiov_inplace); | |
2458 | qemu_iovec_destroy(&qiov_inplace); | |
2459 | if (ret < 0) { | |
9a8c4cce | 2460 | return ret; |
8d3b1a2d KW |
2461 | } |
2462 | ||
83f64091 | 2463 | sector_num += nb_sectors; |
6ea44308 | 2464 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2465 | count -= len; |
2466 | } | |
2467 | ||
2468 | /* add data from the last sector */ | |
2469 | if (count > 0) { | |
9a8c4cce KW |
2470 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2471 | return ret; | |
8d3b1a2d | 2472 | qemu_iovec_to_buf(qiov, qiov->size - count, tmp_buf, count); |
9a8c4cce KW |
2473 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2474 | return ret; | |
83f64091 | 2475 | } |
8d3b1a2d KW |
2476 | return qiov->size; |
2477 | } | |
2478 | ||
2479 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
2480 | const void *buf, int count1) | |
2481 | { | |
2482 | QEMUIOVector qiov; | |
2483 | struct iovec iov = { | |
2484 | .iov_base = (void *) buf, | |
2485 | .iov_len = count1, | |
2486 | }; | |
2487 | ||
2488 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2489 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2490 | } |
83f64091 | 2491 | |
f08145fe KW |
2492 | /* |
2493 | * Writes to the file and ensures that no writes are reordered across this | |
2494 | * request (acts as a barrier) | |
2495 | * | |
2496 | * Returns 0 on success, -errno in error cases. | |
2497 | */ | |
2498 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2499 | const void *buf, int count) | |
2500 | { | |
2501 | int ret; | |
2502 | ||
2503 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2504 | if (ret < 0) { | |
2505 | return ret; | |
2506 | } | |
2507 | ||
f05fa4ad PB |
2508 | /* No flush needed for cache modes that already do it */ |
2509 | if (bs->enable_write_cache) { | |
f08145fe KW |
2510 | bdrv_flush(bs); |
2511 | } | |
2512 | ||
2513 | return 0; | |
2514 | } | |
2515 | ||
470c0504 | 2516 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2517 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2518 | { | |
2519 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2520 | * their read buffer while the operation is in progress do not end up | |
2521 | * modifying the image file. This is critical for zero-copy guest I/O | |
2522 | * where anything might happen inside guest memory. | |
2523 | */ | |
2524 | void *bounce_buffer; | |
2525 | ||
79c053bd | 2526 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2527 | struct iovec iov; |
2528 | QEMUIOVector bounce_qiov; | |
2529 | int64_t cluster_sector_num; | |
2530 | int cluster_nb_sectors; | |
2531 | size_t skip_bytes; | |
2532 | int ret; | |
2533 | ||
2534 | /* Cover entire cluster so no additional backing file I/O is required when | |
2535 | * allocating cluster in the image file. | |
2536 | */ | |
343bded4 PB |
2537 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2538 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2539 | |
470c0504 SH |
2540 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2541 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2542 | |
2543 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2544 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2545 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2546 | ||
79c053bd SH |
2547 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2548 | &bounce_qiov); | |
ab185921 SH |
2549 | if (ret < 0) { |
2550 | goto err; | |
2551 | } | |
2552 | ||
79c053bd SH |
2553 | if (drv->bdrv_co_write_zeroes && |
2554 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
2555 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
2556 | cluster_nb_sectors); | |
79c053bd | 2557 | } else { |
f05fa4ad PB |
2558 | /* This does not change the data on the disk, it is not necessary |
2559 | * to flush even in cache=writethrough mode. | |
2560 | */ | |
79c053bd | 2561 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2562 | &bounce_qiov); |
79c053bd SH |
2563 | } |
2564 | ||
ab185921 SH |
2565 | if (ret < 0) { |
2566 | /* It might be okay to ignore write errors for guest requests. If this | |
2567 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2568 | * Simply report it in all cases. | |
2569 | */ | |
2570 | goto err; | |
2571 | } | |
2572 | ||
2573 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2574 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2575 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2576 | |
2577 | err: | |
2578 | qemu_vfree(bounce_buffer); | |
2579 | return ret; | |
2580 | } | |
2581 | ||
c5fbe571 SH |
2582 | /* |
2583 | * Handle a read request in coroutine context | |
2584 | */ | |
2585 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2586 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2587 | BdrvRequestFlags flags) | |
da1fa91d KW |
2588 | { |
2589 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2590 | BdrvTrackedRequest req; |
2591 | int ret; | |
da1fa91d | 2592 | |
da1fa91d KW |
2593 | if (!drv) { |
2594 | return -ENOMEDIUM; | |
2595 | } | |
2596 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2597 | return -EIO; | |
2598 | } | |
2599 | ||
f4658285 | 2600 | if (bs->copy_on_read) { |
470c0504 SH |
2601 | flags |= BDRV_REQ_COPY_ON_READ; |
2602 | } | |
2603 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2604 | bs->copy_on_read_in_flight++; | |
2605 | } | |
2606 | ||
2607 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2608 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2609 | } | |
2610 | ||
cc0681c4 BC |
2611 | /* throttling disk I/O */ |
2612 | if (bs->io_limits_enabled) { | |
2613 | bdrv_io_limits_intercept(bs, nb_sectors, false); | |
2614 | } | |
2615 | ||
dbffbdcf | 2616 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2617 | |
470c0504 | 2618 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2619 | int pnum; |
2620 | ||
bdad13b9 | 2621 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
2622 | if (ret < 0) { |
2623 | goto out; | |
2624 | } | |
2625 | ||
2626 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2627 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2628 | goto out; |
2629 | } | |
2630 | } | |
2631 | ||
893a8f62 MK |
2632 | if (!(bs->zero_beyond_eof && bs->growable)) { |
2633 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
2634 | } else { | |
2635 | /* Read zeros after EOF of growable BDSes */ | |
2636 | int64_t len, total_sectors, max_nb_sectors; | |
2637 | ||
2638 | len = bdrv_getlength(bs); | |
2639 | if (len < 0) { | |
2640 | ret = len; | |
2641 | goto out; | |
2642 | } | |
2643 | ||
2644 | total_sectors = len >> BDRV_SECTOR_BITS; | |
2645 | max_nb_sectors = MAX(0, total_sectors - sector_num); | |
2646 | if (max_nb_sectors > 0) { | |
2647 | ret = drv->bdrv_co_readv(bs, sector_num, | |
2648 | MIN(nb_sectors, max_nb_sectors), qiov); | |
2649 | } else { | |
2650 | ret = 0; | |
2651 | } | |
2652 | ||
2653 | /* Reading beyond end of file is supposed to produce zeroes */ | |
2654 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
2655 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
2656 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
2657 | BDRV_SECTOR_SIZE; | |
2658 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
2659 | } | |
2660 | } | |
ab185921 SH |
2661 | |
2662 | out: | |
dbffbdcf | 2663 | tracked_request_end(&req); |
470c0504 SH |
2664 | |
2665 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2666 | bs->copy_on_read_in_flight--; | |
2667 | } | |
2668 | ||
dbffbdcf | 2669 | return ret; |
da1fa91d KW |
2670 | } |
2671 | ||
c5fbe571 | 2672 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2673 | int nb_sectors, QEMUIOVector *qiov) |
2674 | { | |
c5fbe571 | 2675 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2676 | |
470c0504 SH |
2677 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2678 | } | |
2679 | ||
2680 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2681 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2682 | { | |
2683 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2684 | ||
2685 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2686 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2687 | } |
2688 | ||
f08f2dda SH |
2689 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
2690 | int64_t sector_num, int nb_sectors) | |
2691 | { | |
2692 | BlockDriver *drv = bs->drv; | |
2693 | QEMUIOVector qiov; | |
2694 | struct iovec iov; | |
2695 | int ret; | |
2696 | ||
621f0589 KW |
2697 | /* TODO Emulate only part of misaligned requests instead of letting block |
2698 | * drivers return -ENOTSUP and emulate everything */ | |
2699 | ||
f08f2dda SH |
2700 | /* First try the efficient write zeroes operation */ |
2701 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
2702 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
2703 | if (ret != -ENOTSUP) { | |
2704 | return ret; | |
2705 | } | |
f08f2dda SH |
2706 | } |
2707 | ||
2708 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2709 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2710 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
2711 | memset(iov.iov_base, 0, iov.iov_len); | |
2712 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2713 | ||
2714 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
2715 | ||
2716 | qemu_vfree(iov.iov_base); | |
2717 | return ret; | |
2718 | } | |
2719 | ||
c5fbe571 SH |
2720 | /* |
2721 | * Handle a write request in coroutine context | |
2722 | */ | |
2723 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2724 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2725 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2726 | { |
2727 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2728 | BdrvTrackedRequest req; |
6b7cb247 | 2729 | int ret; |
da1fa91d KW |
2730 | |
2731 | if (!bs->drv) { | |
2732 | return -ENOMEDIUM; | |
2733 | } | |
2734 | if (bs->read_only) { | |
2735 | return -EACCES; | |
2736 | } | |
2737 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2738 | return -EIO; | |
2739 | } | |
2740 | ||
470c0504 | 2741 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2742 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2743 | } | |
2744 | ||
cc0681c4 BC |
2745 | /* throttling disk I/O */ |
2746 | if (bs->io_limits_enabled) { | |
2747 | bdrv_io_limits_intercept(bs, nb_sectors, true); | |
2748 | } | |
2749 | ||
dbffbdcf SH |
2750 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2751 | ||
d616b224 SH |
2752 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req); |
2753 | ||
2754 | if (ret < 0) { | |
2755 | /* Do nothing, write notifier decided to fail this request */ | |
2756 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
f08f2dda SH |
2757 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); |
2758 | } else { | |
2759 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2760 | } | |
6b7cb247 | 2761 | |
f05fa4ad PB |
2762 | if (ret == 0 && !bs->enable_write_cache) { |
2763 | ret = bdrv_co_flush(bs); | |
2764 | } | |
2765 | ||
da1fa91d | 2766 | if (bs->dirty_bitmap) { |
1755da16 | 2767 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2768 | } |
2769 | ||
2770 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2771 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2772 | } | |
df2a6f29 PB |
2773 | if (bs->growable && ret >= 0) { |
2774 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
2775 | } | |
da1fa91d | 2776 | |
dbffbdcf SH |
2777 | tracked_request_end(&req); |
2778 | ||
6b7cb247 | 2779 | return ret; |
da1fa91d KW |
2780 | } |
2781 | ||
c5fbe571 SH |
2782 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2783 | int nb_sectors, QEMUIOVector *qiov) | |
2784 | { | |
2785 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2786 | ||
f08f2dda SH |
2787 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2788 | } | |
2789 | ||
2790 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2791 | int64_t sector_num, int nb_sectors) | |
2792 | { | |
2793 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2794 | ||
2795 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2796 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2797 | } |
2798 | ||
83f64091 FB |
2799 | /** |
2800 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2801 | */ | |
2802 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2803 | { | |
2804 | BlockDriver *drv = bs->drv; | |
51762288 | 2805 | int ret; |
83f64091 | 2806 | if (!drv) |
19cb3738 | 2807 | return -ENOMEDIUM; |
83f64091 FB |
2808 | if (!drv->bdrv_truncate) |
2809 | return -ENOTSUP; | |
59f2689d NS |
2810 | if (bs->read_only) |
2811 | return -EACCES; | |
8591675f MT |
2812 | if (bdrv_in_use(bs)) |
2813 | return -EBUSY; | |
51762288 SH |
2814 | ret = drv->bdrv_truncate(bs, offset); |
2815 | if (ret == 0) { | |
2816 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2817 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2818 | } |
2819 | return ret; | |
83f64091 FB |
2820 | } |
2821 | ||
4a1d5e1f FZ |
2822 | /** |
2823 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2824 | * allocated space. Return < 0 if error or unknown. | |
2825 | */ | |
2826 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2827 | { | |
2828 | BlockDriver *drv = bs->drv; | |
2829 | if (!drv) { | |
2830 | return -ENOMEDIUM; | |
2831 | } | |
2832 | if (drv->bdrv_get_allocated_file_size) { | |
2833 | return drv->bdrv_get_allocated_file_size(bs); | |
2834 | } | |
2835 | if (bs->file) { | |
2836 | return bdrv_get_allocated_file_size(bs->file); | |
2837 | } | |
2838 | return -ENOTSUP; | |
2839 | } | |
2840 | ||
83f64091 FB |
2841 | /** |
2842 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2843 | */ | |
2844 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2845 | { | |
2846 | BlockDriver *drv = bs->drv; | |
2847 | if (!drv) | |
19cb3738 | 2848 | return -ENOMEDIUM; |
51762288 | 2849 | |
df2a6f29 | 2850 | if (bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2851 | if (drv->bdrv_getlength) { |
2852 | return drv->bdrv_getlength(bs); | |
2853 | } | |
83f64091 | 2854 | } |
46a4e4e6 | 2855 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2856 | } |
2857 | ||
19cb3738 | 2858 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2859 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2860 | { |
19cb3738 FB |
2861 | int64_t length; |
2862 | length = bdrv_getlength(bs); | |
2863 | if (length < 0) | |
2864 | length = 0; | |
2865 | else | |
6ea44308 | 2866 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2867 | *nb_sectors_ptr = length; |
fc01f7e7 | 2868 | } |
cf98951b | 2869 | |
ff06f5f3 PB |
2870 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
2871 | BlockdevOnError on_write_error) | |
abd7f68d MA |
2872 | { |
2873 | bs->on_read_error = on_read_error; | |
2874 | bs->on_write_error = on_write_error; | |
2875 | } | |
2876 | ||
1ceee0d5 | 2877 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
2878 | { |
2879 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2880 | } | |
2881 | ||
3e1caa5f PB |
2882 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
2883 | { | |
2884 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
2885 | ||
2886 | switch (on_err) { | |
2887 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2888 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
2889 | case BLOCKDEV_ON_ERROR_STOP: | |
2890 | return BDRV_ACTION_STOP; | |
2891 | case BLOCKDEV_ON_ERROR_REPORT: | |
2892 | return BDRV_ACTION_REPORT; | |
2893 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2894 | return BDRV_ACTION_IGNORE; | |
2895 | default: | |
2896 | abort(); | |
2897 | } | |
2898 | } | |
2899 | ||
2900 | /* This is done by device models because, while the block layer knows | |
2901 | * about the error, it does not know whether an operation comes from | |
2902 | * the device or the block layer (from a job, for example). | |
2903 | */ | |
2904 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
2905 | bool is_read, int error) | |
2906 | { | |
2907 | assert(error >= 0); | |
32c81a4a | 2908 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
2909 | if (action == BDRV_ACTION_STOP) { |
2910 | vm_stop(RUN_STATE_IO_ERROR); | |
2911 | bdrv_iostatus_set_err(bs, error); | |
2912 | } | |
2913 | } | |
2914 | ||
b338082b FB |
2915 | int bdrv_is_read_only(BlockDriverState *bs) |
2916 | { | |
2917 | return bs->read_only; | |
2918 | } | |
2919 | ||
985a03b0 TS |
2920 | int bdrv_is_sg(BlockDriverState *bs) |
2921 | { | |
2922 | return bs->sg; | |
2923 | } | |
2924 | ||
e900a7b7 CH |
2925 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2926 | { | |
2927 | return bs->enable_write_cache; | |
2928 | } | |
2929 | ||
425b0148 PB |
2930 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2931 | { | |
2932 | bs->enable_write_cache = wce; | |
55b110f2 JC |
2933 | |
2934 | /* so a reopen() will preserve wce */ | |
2935 | if (wce) { | |
2936 | bs->open_flags |= BDRV_O_CACHE_WB; | |
2937 | } else { | |
2938 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
2939 | } | |
425b0148 PB |
2940 | } |
2941 | ||
ea2384d3 FB |
2942 | int bdrv_is_encrypted(BlockDriverState *bs) |
2943 | { | |
2944 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2945 | return 1; | |
2946 | return bs->encrypted; | |
2947 | } | |
2948 | ||
c0f4ce77 AL |
2949 | int bdrv_key_required(BlockDriverState *bs) |
2950 | { | |
2951 | BlockDriverState *backing_hd = bs->backing_hd; | |
2952 | ||
2953 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2954 | return 1; | |
2955 | return (bs->encrypted && !bs->valid_key); | |
2956 | } | |
2957 | ||
ea2384d3 FB |
2958 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2959 | { | |
2960 | int ret; | |
2961 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2962 | ret = bdrv_set_key(bs->backing_hd, key); | |
2963 | if (ret < 0) | |
2964 | return ret; | |
2965 | if (!bs->encrypted) | |
2966 | return 0; | |
2967 | } | |
fd04a2ae SH |
2968 | if (!bs->encrypted) { |
2969 | return -EINVAL; | |
2970 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2971 | return -ENOMEDIUM; | |
2972 | } | |
c0f4ce77 | 2973 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2974 | if (ret < 0) { |
2975 | bs->valid_key = 0; | |
2976 | } else if (!bs->valid_key) { | |
2977 | bs->valid_key = 1; | |
2978 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2979 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2980 | } |
c0f4ce77 | 2981 | return ret; |
ea2384d3 FB |
2982 | } |
2983 | ||
f8d6bba1 | 2984 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2985 | { |
f8d6bba1 | 2986 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2987 | } |
2988 | ||
5fafdf24 | 2989 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2990 | void *opaque) |
2991 | { | |
2992 | BlockDriver *drv; | |
2993 | ||
8a22f02a | 2994 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2995 | it(opaque, drv->format_name); |
2996 | } | |
2997 | } | |
2998 | ||
b338082b FB |
2999 | BlockDriverState *bdrv_find(const char *name) |
3000 | { | |
3001 | BlockDriverState *bs; | |
3002 | ||
1b7bdbc1 SH |
3003 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
3004 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 3005 | return bs; |
1b7bdbc1 | 3006 | } |
b338082b FB |
3007 | } |
3008 | return NULL; | |
3009 | } | |
3010 | ||
2f399b0a MA |
3011 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3012 | { | |
3013 | if (!bs) { | |
3014 | return QTAILQ_FIRST(&bdrv_states); | |
3015 | } | |
3016 | return QTAILQ_NEXT(bs, list); | |
3017 | } | |
3018 | ||
51de9760 | 3019 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3020 | { |
3021 | BlockDriverState *bs; | |
3022 | ||
1b7bdbc1 | 3023 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 3024 | it(opaque, bs); |
81d0912d FB |
3025 | } |
3026 | } | |
3027 | ||
ea2384d3 FB |
3028 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3029 | { | |
3030 | return bs->device_name; | |
3031 | } | |
3032 | ||
c8433287 MA |
3033 | int bdrv_get_flags(BlockDriverState *bs) |
3034 | { | |
3035 | return bs->open_flags; | |
3036 | } | |
3037 | ||
f0f0fdfe | 3038 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3039 | { |
3040 | BlockDriverState *bs; | |
f0f0fdfe | 3041 | int result = 0; |
c6ca28d6 | 3042 | |
1b7bdbc1 | 3043 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
f0f0fdfe KW |
3044 | int ret = bdrv_flush(bs); |
3045 | if (ret < 0 && !result) { | |
3046 | result = ret; | |
3047 | } | |
1b7bdbc1 | 3048 | } |
f0f0fdfe KW |
3049 | |
3050 | return result; | |
c6ca28d6 AL |
3051 | } |
3052 | ||
3ac21627 PL |
3053 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3054 | { | |
3055 | return 1; | |
3056 | } | |
3057 | ||
f2feebbd KW |
3058 | int bdrv_has_zero_init(BlockDriverState *bs) |
3059 | { | |
3060 | assert(bs->drv); | |
3061 | ||
11212d8f PB |
3062 | /* If BS is a copy on write image, it is initialized to |
3063 | the contents of the base image, which may not be zeroes. */ | |
3064 | if (bs->backing_hd) { | |
3065 | return 0; | |
3066 | } | |
336c1c12 KW |
3067 | if (bs->drv->bdrv_has_zero_init) { |
3068 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3069 | } |
3070 | ||
3ac21627 PL |
3071 | /* safe default */ |
3072 | return 0; | |
f2feebbd KW |
3073 | } |
3074 | ||
b6b8a333 | 3075 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3076 | BlockDriverState *bs; |
b35b2bba | 3077 | BlockDriverState *base; |
376ae3f1 SH |
3078 | int64_t sector_num; |
3079 | int nb_sectors; | |
3080 | int *pnum; | |
b6b8a333 | 3081 | int64_t ret; |
376ae3f1 | 3082 | bool done; |
b6b8a333 | 3083 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3084 | |
f58c7b35 TS |
3085 | /* |
3086 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3087 | * not implementing the functionality are assumed to not support backing files, | |
3088 | * hence all their sectors are reported as allocated. | |
3089 | * | |
bd9533e3 SH |
3090 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3091 | * and 'pnum' is set to 0. | |
3092 | * | |
f58c7b35 TS |
3093 | * 'pnum' is set to the number of sectors (including and immediately following |
3094 | * the specified sector) that are known to be in the same | |
3095 | * allocated/unallocated state. | |
3096 | * | |
bd9533e3 SH |
3097 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3098 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3099 | */ |
b6b8a333 PB |
3100 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3101 | int64_t sector_num, | |
3102 | int nb_sectors, int *pnum) | |
f58c7b35 | 3103 | { |
617ccb46 | 3104 | int64_t length; |
bd9533e3 | 3105 | int64_t n; |
5daa74a6 | 3106 | int64_t ret, ret2; |
bd9533e3 | 3107 | |
617ccb46 PB |
3108 | length = bdrv_getlength(bs); |
3109 | if (length < 0) { | |
3110 | return length; | |
3111 | } | |
3112 | ||
3113 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3114 | *pnum = 0; |
3115 | return 0; | |
3116 | } | |
3117 | ||
3118 | n = bs->total_sectors - sector_num; | |
3119 | if (n < nb_sectors) { | |
3120 | nb_sectors = n; | |
3121 | } | |
3122 | ||
b6b8a333 | 3123 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3124 | *pnum = nb_sectors; |
918e92d7 PB |
3125 | ret = BDRV_BLOCK_DATA; |
3126 | if (bs->drv->protocol_name) { | |
3127 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3128 | } | |
3129 | return ret; | |
f58c7b35 | 3130 | } |
6aebab14 | 3131 | |
415b5b01 PB |
3132 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3133 | if (ret < 0) { | |
3134 | return ret; | |
3135 | } | |
3136 | ||
f0ad5712 PB |
3137 | if (!(ret & BDRV_BLOCK_DATA)) { |
3138 | if (bdrv_has_zero_init(bs)) { | |
3139 | ret |= BDRV_BLOCK_ZERO; | |
3140 | } else { | |
3141 | BlockDriverState *bs2 = bs->backing_hd; | |
3142 | int64_t length2 = bdrv_getlength(bs2); | |
3143 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3144 | ret |= BDRV_BLOCK_ZERO; | |
3145 | } | |
3146 | } | |
415b5b01 | 3147 | } |
5daa74a6 PB |
3148 | |
3149 | if (bs->file && | |
3150 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3151 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3152 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3153 | *pnum, pnum); | |
3154 | if (ret2 >= 0) { | |
3155 | /* Ignore errors. This is just providing extra information, it | |
3156 | * is useful but not necessary. | |
3157 | */ | |
3158 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3159 | } | |
3160 | } | |
3161 | ||
415b5b01 | 3162 | return ret; |
060f51c9 SH |
3163 | } |
3164 | ||
b6b8a333 PB |
3165 | /* Coroutine wrapper for bdrv_get_block_status() */ |
3166 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 3167 | { |
b6b8a333 | 3168 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
3169 | BlockDriverState *bs = data->bs; |
3170 | ||
b6b8a333 PB |
3171 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
3172 | data->pnum); | |
060f51c9 SH |
3173 | data->done = true; |
3174 | } | |
3175 | ||
3176 | /* | |
b6b8a333 | 3177 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 3178 | * |
b6b8a333 | 3179 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 3180 | */ |
b6b8a333 PB |
3181 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
3182 | int nb_sectors, int *pnum) | |
060f51c9 | 3183 | { |
6aebab14 | 3184 | Coroutine *co; |
b6b8a333 | 3185 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
3186 | .bs = bs, |
3187 | .sector_num = sector_num, | |
3188 | .nb_sectors = nb_sectors, | |
3189 | .pnum = pnum, | |
3190 | .done = false, | |
3191 | }; | |
3192 | ||
bdad13b9 PB |
3193 | if (qemu_in_coroutine()) { |
3194 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 3195 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 3196 | } else { |
b6b8a333 | 3197 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
3198 | qemu_coroutine_enter(co, &data); |
3199 | while (!data.done) { | |
3200 | qemu_aio_wait(); | |
3201 | } | |
6aebab14 SH |
3202 | } |
3203 | return data.ret; | |
f58c7b35 TS |
3204 | } |
3205 | ||
b6b8a333 PB |
3206 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
3207 | int nb_sectors, int *pnum) | |
3208 | { | |
4333bb71 PB |
3209 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
3210 | if (ret < 0) { | |
3211 | return ret; | |
3212 | } | |
3213 | return | |
3214 | (ret & BDRV_BLOCK_DATA) || | |
3215 | ((ret & BDRV_BLOCK_ZERO) && !bdrv_has_zero_init(bs)); | |
b6b8a333 PB |
3216 | } |
3217 | ||
188a7bbf PB |
3218 | /* |
3219 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3220 | * | |
3221 | * Return true if the given sector is allocated in any image between | |
3222 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3223 | * sector is allocated in any image of the chain. Return false otherwise. | |
3224 | * | |
3225 | * 'pnum' is set to the number of sectors (including and immediately following | |
3226 | * the specified sector) that are known to be in the same | |
3227 | * allocated/unallocated state. | |
3228 | * | |
3229 | */ | |
4f578637 PB |
3230 | int bdrv_is_allocated_above(BlockDriverState *top, |
3231 | BlockDriverState *base, | |
3232 | int64_t sector_num, | |
3233 | int nb_sectors, int *pnum) | |
188a7bbf PB |
3234 | { |
3235 | BlockDriverState *intermediate; | |
3236 | int ret, n = nb_sectors; | |
3237 | ||
3238 | intermediate = top; | |
3239 | while (intermediate && intermediate != base) { | |
3240 | int pnum_inter; | |
bdad13b9 PB |
3241 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
3242 | &pnum_inter); | |
188a7bbf PB |
3243 | if (ret < 0) { |
3244 | return ret; | |
3245 | } else if (ret) { | |
3246 | *pnum = pnum_inter; | |
3247 | return 1; | |
3248 | } | |
3249 | ||
3250 | /* | |
3251 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3252 | * might have | |
3253 | * | |
3254 | * [sector_num+x, nr_sectors] allocated. | |
3255 | */ | |
63ba17d3 VI |
3256 | if (n > pnum_inter && |
3257 | (intermediate == top || | |
3258 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3259 | n = pnum_inter; |
3260 | } | |
3261 | ||
3262 | intermediate = intermediate->backing_hd; | |
3263 | } | |
3264 | ||
3265 | *pnum = n; | |
3266 | return 0; | |
3267 | } | |
3268 | ||
045df330 AL |
3269 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3270 | { | |
3271 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3272 | return bs->backing_file; | |
3273 | else if (bs->encrypted) | |
3274 | return bs->filename; | |
3275 | else | |
3276 | return NULL; | |
3277 | } | |
3278 | ||
5fafdf24 | 3279 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3280 | char *filename, int filename_size) |
3281 | { | |
3574c608 | 3282 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3283 | } |
3284 | ||
5fafdf24 | 3285 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3286 | const uint8_t *buf, int nb_sectors) |
3287 | { | |
3288 | BlockDriver *drv = bs->drv; | |
3289 | if (!drv) | |
19cb3738 | 3290 | return -ENOMEDIUM; |
faea38e7 FB |
3291 | if (!drv->bdrv_write_compressed) |
3292 | return -ENOTSUP; | |
fbb7b4e0 KW |
3293 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3294 | return -EIO; | |
a55eb92c | 3295 | |
1755da16 | 3296 | assert(!bs->dirty_bitmap); |
a55eb92c | 3297 | |
faea38e7 FB |
3298 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3299 | } | |
3b46e624 | 3300 | |
faea38e7 FB |
3301 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3302 | { | |
3303 | BlockDriver *drv = bs->drv; | |
3304 | if (!drv) | |
19cb3738 | 3305 | return -ENOMEDIUM; |
faea38e7 FB |
3306 | if (!drv->bdrv_get_info) |
3307 | return -ENOTSUP; | |
3308 | memset(bdi, 0, sizeof(*bdi)); | |
3309 | return drv->bdrv_get_info(bs, bdi); | |
3310 | } | |
3311 | ||
45566e9c CH |
3312 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3313 | int64_t pos, int size) | |
cf8074b3 KW |
3314 | { |
3315 | QEMUIOVector qiov; | |
3316 | struct iovec iov = { | |
3317 | .iov_base = (void *) buf, | |
3318 | .iov_len = size, | |
3319 | }; | |
3320 | ||
3321 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3322 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3323 | } | |
3324 | ||
3325 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
3326 | { |
3327 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
3328 | |
3329 | if (!drv) { | |
178e08a5 | 3330 | return -ENOMEDIUM; |
cf8074b3 KW |
3331 | } else if (drv->bdrv_save_vmstate) { |
3332 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
3333 | } else if (bs->file) { | |
3334 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
3335 | } | |
3336 | ||
7cdb1f6d | 3337 | return -ENOTSUP; |
178e08a5 AL |
3338 | } |
3339 | ||
45566e9c CH |
3340 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3341 | int64_t pos, int size) | |
178e08a5 AL |
3342 | { |
3343 | BlockDriver *drv = bs->drv; | |
3344 | if (!drv) | |
3345 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3346 | if (drv->bdrv_load_vmstate) |
3347 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3348 | if (bs->file) | |
3349 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3350 | return -ENOTSUP; | |
178e08a5 AL |
3351 | } |
3352 | ||
8b9b0cc2 KW |
3353 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3354 | { | |
bf736fe3 | 3355 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
3356 | return; |
3357 | } | |
3358 | ||
bf736fe3 | 3359 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3360 | } |
3361 | ||
3362 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3363 | const char *tag) | |
3364 | { | |
3365 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3366 | bs = bs->file; | |
3367 | } | |
3368 | ||
3369 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3370 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3371 | } | |
3372 | ||
3373 | return -ENOTSUP; | |
3374 | } | |
3375 | ||
3376 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) | |
3377 | { | |
3378 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3379 | bs = bs->file; | |
3380 | } | |
8b9b0cc2 | 3381 | |
41c695c7 KW |
3382 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3383 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3384 | } | |
3385 | ||
3386 | return -ENOTSUP; | |
3387 | } | |
3388 | ||
3389 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3390 | { | |
3391 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3392 | bs = bs->file; | |
3393 | } | |
3394 | ||
3395 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3396 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3397 | } | |
3398 | ||
3399 | return false; | |
8b9b0cc2 KW |
3400 | } |
3401 | ||
199630b6 BS |
3402 | int bdrv_is_snapshot(BlockDriverState *bs) |
3403 | { | |
3404 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3405 | } | |
3406 | ||
b1b1d783 JC |
3407 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3408 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3409 | * from a BDS as backing_file should not be done, as that may be relative to | |
3410 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3411 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3412 | const char *backing_file) | |
3413 | { | |
b1b1d783 JC |
3414 | char *filename_full = NULL; |
3415 | char *backing_file_full = NULL; | |
3416 | char *filename_tmp = NULL; | |
3417 | int is_protocol = 0; | |
3418 | BlockDriverState *curr_bs = NULL; | |
3419 | BlockDriverState *retval = NULL; | |
3420 | ||
3421 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3422 | return NULL; |
3423 | } | |
3424 | ||
b1b1d783 JC |
3425 | filename_full = g_malloc(PATH_MAX); |
3426 | backing_file_full = g_malloc(PATH_MAX); | |
3427 | filename_tmp = g_malloc(PATH_MAX); | |
3428 | ||
3429 | is_protocol = path_has_protocol(backing_file); | |
3430 | ||
3431 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3432 | ||
3433 | /* If either of the filename paths is actually a protocol, then | |
3434 | * compare unmodified paths; otherwise make paths relative */ | |
3435 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3436 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3437 | retval = curr_bs->backing_hd; | |
3438 | break; | |
3439 | } | |
e8a6bb9c | 3440 | } else { |
b1b1d783 JC |
3441 | /* If not an absolute filename path, make it relative to the current |
3442 | * image's filename path */ | |
3443 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3444 | backing_file); | |
3445 | ||
3446 | /* We are going to compare absolute pathnames */ | |
3447 | if (!realpath(filename_tmp, filename_full)) { | |
3448 | continue; | |
3449 | } | |
3450 | ||
3451 | /* We need to make sure the backing filename we are comparing against | |
3452 | * is relative to the current image filename (or absolute) */ | |
3453 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3454 | curr_bs->backing_file); | |
3455 | ||
3456 | if (!realpath(filename_tmp, backing_file_full)) { | |
3457 | continue; | |
3458 | } | |
3459 | ||
3460 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3461 | retval = curr_bs->backing_hd; | |
3462 | break; | |
3463 | } | |
e8a6bb9c MT |
3464 | } |
3465 | } | |
3466 | ||
b1b1d783 JC |
3467 | g_free(filename_full); |
3468 | g_free(backing_file_full); | |
3469 | g_free(filename_tmp); | |
3470 | return retval; | |
e8a6bb9c MT |
3471 | } |
3472 | ||
f198fd1c BC |
3473 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3474 | { | |
3475 | if (!bs->drv) { | |
3476 | return 0; | |
3477 | } | |
3478 | ||
3479 | if (!bs->backing_hd) { | |
3480 | return 0; | |
3481 | } | |
3482 | ||
3483 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3484 | } | |
3485 | ||
79fac568 JC |
3486 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3487 | { | |
3488 | BlockDriverState *curr_bs = NULL; | |
3489 | ||
3490 | if (!bs) { | |
3491 | return NULL; | |
3492 | } | |
3493 | ||
3494 | curr_bs = bs; | |
3495 | ||
3496 | while (curr_bs->backing_hd) { | |
3497 | curr_bs = curr_bs->backing_hd; | |
3498 | } | |
3499 | return curr_bs; | |
3500 | } | |
3501 | ||
ea2384d3 | 3502 | /**************************************************************/ |
83f64091 | 3503 | /* async I/Os */ |
ea2384d3 | 3504 | |
3b69e4b9 | 3505 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3506 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3507 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3508 | { |
bbf0a440 SH |
3509 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3510 | ||
b2a61371 | 3511 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3512 | cb, opaque, false); |
ea2384d3 FB |
3513 | } |
3514 | ||
f141eafe AL |
3515 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3516 | QEMUIOVector *qiov, int nb_sectors, | |
3517 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3518 | { |
bbf0a440 SH |
3519 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3520 | ||
1a6e115b | 3521 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3522 | cb, opaque, true); |
83f64091 FB |
3523 | } |
3524 | ||
40b4f539 KW |
3525 | |
3526 | typedef struct MultiwriteCB { | |
3527 | int error; | |
3528 | int num_requests; | |
3529 | int num_callbacks; | |
3530 | struct { | |
3531 | BlockDriverCompletionFunc *cb; | |
3532 | void *opaque; | |
3533 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3534 | } callbacks[]; |
3535 | } MultiwriteCB; | |
3536 | ||
3537 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3538 | { | |
3539 | int i; | |
3540 | ||
3541 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3542 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3543 | if (mcb->callbacks[i].free_qiov) { |
3544 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3545 | } | |
7267c094 | 3546 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3547 | } |
3548 | } | |
3549 | ||
3550 | static void multiwrite_cb(void *opaque, int ret) | |
3551 | { | |
3552 | MultiwriteCB *mcb = opaque; | |
3553 | ||
6d519a5f SH |
3554 | trace_multiwrite_cb(mcb, ret); |
3555 | ||
cb6d3ca0 | 3556 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3557 | mcb->error = ret; |
40b4f539 KW |
3558 | } |
3559 | ||
3560 | mcb->num_requests--; | |
3561 | if (mcb->num_requests == 0) { | |
de189a1b | 3562 | multiwrite_user_cb(mcb); |
7267c094 | 3563 | g_free(mcb); |
40b4f539 KW |
3564 | } |
3565 | } | |
3566 | ||
3567 | static int multiwrite_req_compare(const void *a, const void *b) | |
3568 | { | |
77be4366 CH |
3569 | const BlockRequest *req1 = a, *req2 = b; |
3570 | ||
3571 | /* | |
3572 | * Note that we can't simply subtract req2->sector from req1->sector | |
3573 | * here as that could overflow the return value. | |
3574 | */ | |
3575 | if (req1->sector > req2->sector) { | |
3576 | return 1; | |
3577 | } else if (req1->sector < req2->sector) { | |
3578 | return -1; | |
3579 | } else { | |
3580 | return 0; | |
3581 | } | |
40b4f539 KW |
3582 | } |
3583 | ||
3584 | /* | |
3585 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3586 | * requests that remain after merging. | |
3587 | */ | |
3588 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3589 | int num_reqs, MultiwriteCB *mcb) | |
3590 | { | |
3591 | int i, outidx; | |
3592 | ||
3593 | // Sort requests by start sector | |
3594 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3595 | ||
3596 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3597 | // filling up gaps with zero sectors. | |
3598 | outidx = 0; | |
3599 | for (i = 1; i < num_reqs; i++) { | |
3600 | int merge = 0; | |
3601 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3602 | ||
b6a127a1 | 3603 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3604 | if (reqs[i].sector <= oldreq_last) { |
3605 | merge = 1; | |
3606 | } | |
3607 | ||
e2a305fb CH |
3608 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3609 | merge = 0; | |
3610 | } | |
3611 | ||
40b4f539 KW |
3612 | if (merge) { |
3613 | size_t size; | |
7267c094 | 3614 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3615 | qemu_iovec_init(qiov, |
3616 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3617 | ||
3618 | // Add the first request to the merged one. If the requests are | |
3619 | // overlapping, drop the last sectors of the first request. | |
3620 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3621 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3622 | |
b6a127a1 PB |
3623 | // We should need to add any zeros between the two requests |
3624 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3625 | |
3626 | // Add the second request | |
1b093c48 | 3627 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3628 | |
cbf1dff2 | 3629 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3630 | reqs[outidx].qiov = qiov; |
3631 | ||
3632 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3633 | } else { | |
3634 | outidx++; | |
3635 | reqs[outidx].sector = reqs[i].sector; | |
3636 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3637 | reqs[outidx].qiov = reqs[i].qiov; | |
3638 | } | |
3639 | } | |
3640 | ||
3641 | return outidx + 1; | |
3642 | } | |
3643 | ||
3644 | /* | |
3645 | * Submit multiple AIO write requests at once. | |
3646 | * | |
3647 | * On success, the function returns 0 and all requests in the reqs array have | |
3648 | * been submitted. In error case this function returns -1, and any of the | |
3649 | * requests may or may not be submitted yet. In particular, this means that the | |
3650 | * callback will be called for some of the requests, for others it won't. The | |
3651 | * caller must check the error field of the BlockRequest to wait for the right | |
3652 | * callbacks (if error != 0, no callback will be called). | |
3653 | * | |
3654 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3655 | * requests. However, the fields opaque and error are left unmodified as they | |
3656 | * are used to signal failure for a single request to the caller. | |
3657 | */ | |
3658 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3659 | { | |
40b4f539 KW |
3660 | MultiwriteCB *mcb; |
3661 | int i; | |
3662 | ||
301db7c2 RH |
3663 | /* don't submit writes if we don't have a medium */ |
3664 | if (bs->drv == NULL) { | |
3665 | for (i = 0; i < num_reqs; i++) { | |
3666 | reqs[i].error = -ENOMEDIUM; | |
3667 | } | |
3668 | return -1; | |
3669 | } | |
3670 | ||
40b4f539 KW |
3671 | if (num_reqs == 0) { |
3672 | return 0; | |
3673 | } | |
3674 | ||
3675 | // Create MultiwriteCB structure | |
7267c094 | 3676 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3677 | mcb->num_requests = 0; |
3678 | mcb->num_callbacks = num_reqs; | |
3679 | ||
3680 | for (i = 0; i < num_reqs; i++) { | |
3681 | mcb->callbacks[i].cb = reqs[i].cb; | |
3682 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3683 | } | |
3684 | ||
3685 | // Check for mergable requests | |
3686 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3687 | ||
6d519a5f SH |
3688 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3689 | ||
df9309fb PB |
3690 | /* Run the aio requests. */ |
3691 | mcb->num_requests = num_reqs; | |
40b4f539 | 3692 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3693 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3694 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3695 | } |
3696 | ||
3697 | return 0; | |
40b4f539 KW |
3698 | } |
3699 | ||
83f64091 | 3700 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3701 | { |
d7331bed | 3702 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3703 | } |
3704 | ||
3705 | /**************************************************************/ | |
3706 | /* async block device emulation */ | |
3707 | ||
c16b5a2c CH |
3708 | typedef struct BlockDriverAIOCBSync { |
3709 | BlockDriverAIOCB common; | |
3710 | QEMUBH *bh; | |
3711 | int ret; | |
3712 | /* vector translation state */ | |
3713 | QEMUIOVector *qiov; | |
3714 | uint8_t *bounce; | |
3715 | int is_write; | |
3716 | } BlockDriverAIOCBSync; | |
3717 | ||
3718 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3719 | { | |
b666d239 KW |
3720 | BlockDriverAIOCBSync *acb = |
3721 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3722 | qemu_bh_delete(acb->bh); |
36afc451 | 3723 | acb->bh = NULL; |
c16b5a2c CH |
3724 | qemu_aio_release(acb); |
3725 | } | |
3726 | ||
d7331bed | 3727 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
3728 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
3729 | .cancel = bdrv_aio_cancel_em, | |
3730 | }; | |
3731 | ||
ce1a14dc | 3732 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3733 | { |
ce1a14dc | 3734 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3735 | |
f141eafe | 3736 | if (!acb->is_write) |
03396148 | 3737 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 3738 | qemu_vfree(acb->bounce); |
ce1a14dc | 3739 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3740 | qemu_bh_delete(acb->bh); |
36afc451 | 3741 | acb->bh = NULL; |
ce1a14dc | 3742 | qemu_aio_release(acb); |
83f64091 | 3743 | } |
beac80cd | 3744 | |
f141eafe AL |
3745 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3746 | int64_t sector_num, | |
3747 | QEMUIOVector *qiov, | |
3748 | int nb_sectors, | |
3749 | BlockDriverCompletionFunc *cb, | |
3750 | void *opaque, | |
3751 | int is_write) | |
3752 | ||
83f64091 | 3753 | { |
ce1a14dc | 3754 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3755 | |
d7331bed | 3756 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
3757 | acb->is_write = is_write; |
3758 | acb->qiov = qiov; | |
e268ca52 | 3759 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3760 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3761 | |
3762 | if (is_write) { | |
d5e6b161 | 3763 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 3764 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3765 | } else { |
1ed20acf | 3766 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3767 | } |
3768 | ||
ce1a14dc | 3769 | qemu_bh_schedule(acb->bh); |
f141eafe | 3770 | |
ce1a14dc | 3771 | return &acb->common; |
beac80cd FB |
3772 | } |
3773 | ||
f141eafe AL |
3774 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3775 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3776 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3777 | { |
f141eafe AL |
3778 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3779 | } | |
83f64091 | 3780 | |
f141eafe AL |
3781 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3782 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3783 | BlockDriverCompletionFunc *cb, void *opaque) | |
3784 | { | |
3785 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3786 | } |
beac80cd | 3787 | |
68485420 KW |
3788 | |
3789 | typedef struct BlockDriverAIOCBCoroutine { | |
3790 | BlockDriverAIOCB common; | |
3791 | BlockRequest req; | |
3792 | bool is_write; | |
d318aea9 | 3793 | bool *done; |
68485420 KW |
3794 | QEMUBH* bh; |
3795 | } BlockDriverAIOCBCoroutine; | |
3796 | ||
3797 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3798 | { | |
d318aea9 KW |
3799 | BlockDriverAIOCBCoroutine *acb = |
3800 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
3801 | bool done = false; | |
3802 | ||
3803 | acb->done = &done; | |
3804 | while (!done) { | |
3805 | qemu_aio_wait(); | |
3806 | } | |
68485420 KW |
3807 | } |
3808 | ||
d7331bed | 3809 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
3810 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
3811 | .cancel = bdrv_aio_co_cancel_em, | |
3812 | }; | |
3813 | ||
35246a68 | 3814 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3815 | { |
3816 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3817 | ||
3818 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
3819 | |
3820 | if (acb->done) { | |
3821 | *acb->done = true; | |
3822 | } | |
3823 | ||
68485420 KW |
3824 | qemu_bh_delete(acb->bh); |
3825 | qemu_aio_release(acb); | |
3826 | } | |
3827 | ||
b2a61371 SH |
3828 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3829 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3830 | { | |
3831 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3832 | BlockDriverState *bs = acb->common.bs; | |
3833 | ||
3834 | if (!acb->is_write) { | |
3835 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3836 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3837 | } else { |
3838 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3839 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3840 | } |
3841 | ||
35246a68 | 3842 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3843 | qemu_bh_schedule(acb->bh); |
3844 | } | |
3845 | ||
68485420 KW |
3846 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3847 | int64_t sector_num, | |
3848 | QEMUIOVector *qiov, | |
3849 | int nb_sectors, | |
3850 | BlockDriverCompletionFunc *cb, | |
3851 | void *opaque, | |
8c5873d6 | 3852 | bool is_write) |
68485420 KW |
3853 | { |
3854 | Coroutine *co; | |
3855 | BlockDriverAIOCBCoroutine *acb; | |
3856 | ||
d7331bed | 3857 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
3858 | acb->req.sector = sector_num; |
3859 | acb->req.nb_sectors = nb_sectors; | |
3860 | acb->req.qiov = qiov; | |
3861 | acb->is_write = is_write; | |
d318aea9 | 3862 | acb->done = NULL; |
68485420 | 3863 | |
8c5873d6 | 3864 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3865 | qemu_coroutine_enter(co, acb); |
3866 | ||
3867 | return &acb->common; | |
3868 | } | |
3869 | ||
07f07615 | 3870 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3871 | { |
07f07615 PB |
3872 | BlockDriverAIOCBCoroutine *acb = opaque; |
3873 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3874 | |
07f07615 PB |
3875 | acb->req.error = bdrv_co_flush(bs); |
3876 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3877 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3878 | } |
3879 | ||
07f07615 | 3880 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3881 | BlockDriverCompletionFunc *cb, void *opaque) |
3882 | { | |
07f07615 | 3883 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3884 | |
07f07615 PB |
3885 | Coroutine *co; |
3886 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3887 | |
d7331bed | 3888 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
3889 | acb->done = NULL; |
3890 | ||
07f07615 PB |
3891 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
3892 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3893 | |
016f5cf6 AG |
3894 | return &acb->common; |
3895 | } | |
3896 | ||
4265d620 PB |
3897 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3898 | { | |
3899 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3900 | BlockDriverState *bs = acb->common.bs; | |
3901 | ||
3902 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3903 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3904 | qemu_bh_schedule(acb->bh); | |
3905 | } | |
3906 | ||
3907 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3908 | int64_t sector_num, int nb_sectors, | |
3909 | BlockDriverCompletionFunc *cb, void *opaque) | |
3910 | { | |
3911 | Coroutine *co; | |
3912 | BlockDriverAIOCBCoroutine *acb; | |
3913 | ||
3914 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3915 | ||
d7331bed | 3916 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
3917 | acb->req.sector = sector_num; |
3918 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 3919 | acb->done = NULL; |
4265d620 PB |
3920 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
3921 | qemu_coroutine_enter(co, acb); | |
3922 | ||
3923 | return &acb->common; | |
3924 | } | |
3925 | ||
ea2384d3 FB |
3926 | void bdrv_init(void) |
3927 | { | |
5efa9d5a | 3928 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3929 | } |
ce1a14dc | 3930 | |
eb852011 MA |
3931 | void bdrv_init_with_whitelist(void) |
3932 | { | |
3933 | use_bdrv_whitelist = 1; | |
3934 | bdrv_init(); | |
3935 | } | |
3936 | ||
d7331bed | 3937 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 3938 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 3939 | { |
ce1a14dc PB |
3940 | BlockDriverAIOCB *acb; |
3941 | ||
d7331bed SH |
3942 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
3943 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
3944 | acb->bs = bs; |
3945 | acb->cb = cb; | |
3946 | acb->opaque = opaque; | |
3947 | return acb; | |
3948 | } | |
3949 | ||
3950 | void qemu_aio_release(void *p) | |
3951 | { | |
d37c975f | 3952 | BlockDriverAIOCB *acb = p; |
d7331bed | 3953 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 3954 | } |
19cb3738 | 3955 | |
f9f05dc5 KW |
3956 | /**************************************************************/ |
3957 | /* Coroutine block device emulation */ | |
3958 | ||
3959 | typedef struct CoroutineIOCompletion { | |
3960 | Coroutine *coroutine; | |
3961 | int ret; | |
3962 | } CoroutineIOCompletion; | |
3963 | ||
3964 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3965 | { | |
3966 | CoroutineIOCompletion *co = opaque; | |
3967 | ||
3968 | co->ret = ret; | |
3969 | qemu_coroutine_enter(co->coroutine, NULL); | |
3970 | } | |
3971 | ||
3972 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3973 | int nb_sectors, QEMUIOVector *iov, | |
3974 | bool is_write) | |
3975 | { | |
3976 | CoroutineIOCompletion co = { | |
3977 | .coroutine = qemu_coroutine_self(), | |
3978 | }; | |
3979 | BlockDriverAIOCB *acb; | |
3980 | ||
3981 | if (is_write) { | |
a652d160 SH |
3982 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3983 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3984 | } else { |
a652d160 SH |
3985 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3986 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3987 | } |
3988 | ||
59370aaa | 3989 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3990 | if (!acb) { |
3991 | return -EIO; | |
3992 | } | |
3993 | qemu_coroutine_yield(); | |
3994 | ||
3995 | return co.ret; | |
3996 | } | |
3997 | ||
3998 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
3999 | int64_t sector_num, int nb_sectors, | |
4000 | QEMUIOVector *iov) | |
4001 | { | |
4002 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4003 | } | |
4004 | ||
4005 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4006 | int64_t sector_num, int nb_sectors, | |
4007 | QEMUIOVector *iov) | |
4008 | { | |
4009 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4010 | } | |
4011 | ||
07f07615 | 4012 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4013 | { |
07f07615 PB |
4014 | RwCo *rwco = opaque; |
4015 | ||
4016 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4017 | } | |
4018 | ||
4019 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4020 | { | |
eb489bb1 KW |
4021 | int ret; |
4022 | ||
29cdb251 | 4023 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4024 | return 0; |
eb489bb1 KW |
4025 | } |
4026 | ||
ca716364 | 4027 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4028 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4029 | if (bs->drv->bdrv_co_flush_to_os) { |
4030 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4031 | if (ret < 0) { | |
4032 | return ret; | |
4033 | } | |
4034 | } | |
4035 | ||
ca716364 KW |
4036 | /* But don't actually force it to the disk with cache=unsafe */ |
4037 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4038 | goto flush_parent; |
ca716364 KW |
4039 | } |
4040 | ||
bf736fe3 | 4041 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4042 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4043 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4044 | } else if (bs->drv->bdrv_aio_flush) { |
4045 | BlockDriverAIOCB *acb; | |
4046 | CoroutineIOCompletion co = { | |
4047 | .coroutine = qemu_coroutine_self(), | |
4048 | }; | |
4049 | ||
4050 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4051 | if (acb == NULL) { | |
29cdb251 | 4052 | ret = -EIO; |
07f07615 PB |
4053 | } else { |
4054 | qemu_coroutine_yield(); | |
29cdb251 | 4055 | ret = co.ret; |
07f07615 | 4056 | } |
07f07615 PB |
4057 | } else { |
4058 | /* | |
4059 | * Some block drivers always operate in either writethrough or unsafe | |
4060 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4061 | * know how the server works (because the behaviour is hardcoded or | |
4062 | * depends on server-side configuration), so we can't ensure that | |
4063 | * everything is safe on disk. Returning an error doesn't work because | |
4064 | * that would break guests even if the server operates in writethrough | |
4065 | * mode. | |
4066 | * | |
4067 | * Let's hope the user knows what he's doing. | |
4068 | */ | |
29cdb251 | 4069 | ret = 0; |
07f07615 | 4070 | } |
29cdb251 PB |
4071 | if (ret < 0) { |
4072 | return ret; | |
4073 | } | |
4074 | ||
4075 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4076 | * in the case of cache=unsafe, so there are no useless flushes. | |
4077 | */ | |
d4c82329 | 4078 | flush_parent: |
29cdb251 | 4079 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4080 | } |
4081 | ||
0f15423c AL |
4082 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4083 | { | |
4084 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4085 | bs->drv->bdrv_invalidate_cache(bs); | |
4086 | } | |
4087 | } | |
4088 | ||
4089 | void bdrv_invalidate_cache_all(void) | |
4090 | { | |
4091 | BlockDriverState *bs; | |
4092 | ||
4093 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4094 | bdrv_invalidate_cache(bs); | |
4095 | } | |
4096 | } | |
4097 | ||
07789269 BC |
4098 | void bdrv_clear_incoming_migration_all(void) |
4099 | { | |
4100 | BlockDriverState *bs; | |
4101 | ||
4102 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4103 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4104 | } | |
4105 | } | |
4106 | ||
07f07615 PB |
4107 | int bdrv_flush(BlockDriverState *bs) |
4108 | { | |
4109 | Coroutine *co; | |
4110 | RwCo rwco = { | |
4111 | .bs = bs, | |
4112 | .ret = NOT_DONE, | |
e7a8a783 | 4113 | }; |
e7a8a783 | 4114 | |
07f07615 PB |
4115 | if (qemu_in_coroutine()) { |
4116 | /* Fast-path if already in coroutine context */ | |
4117 | bdrv_flush_co_entry(&rwco); | |
4118 | } else { | |
4119 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4120 | qemu_coroutine_enter(co, &rwco); | |
4121 | while (rwco.ret == NOT_DONE) { | |
4122 | qemu_aio_wait(); | |
4123 | } | |
e7a8a783 | 4124 | } |
07f07615 PB |
4125 | |
4126 | return rwco.ret; | |
e7a8a783 KW |
4127 | } |
4128 | ||
4265d620 PB |
4129 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4130 | { | |
4131 | RwCo *rwco = opaque; | |
4132 | ||
4133 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4134 | } | |
4135 | ||
4136 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
4137 | int nb_sectors) | |
4138 | { | |
4139 | if (!bs->drv) { | |
4140 | return -ENOMEDIUM; | |
4141 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4142 | return -EIO; | |
4143 | } else if (bs->read_only) { | |
4144 | return -EROFS; | |
df702c9b PB |
4145 | } |
4146 | ||
4147 | if (bs->dirty_bitmap) { | |
8f0720ec | 4148 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b PB |
4149 | } |
4150 | ||
9e8f1835 PB |
4151 | /* Do nothing if disabled. */ |
4152 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4153 | return 0; | |
4154 | } | |
4155 | ||
df702c9b | 4156 | if (bs->drv->bdrv_co_discard) { |
4265d620 PB |
4157 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
4158 | } else if (bs->drv->bdrv_aio_discard) { | |
4159 | BlockDriverAIOCB *acb; | |
4160 | CoroutineIOCompletion co = { | |
4161 | .coroutine = qemu_coroutine_self(), | |
4162 | }; | |
4163 | ||
4164 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4165 | bdrv_co_io_em_complete, &co); | |
4166 | if (acb == NULL) { | |
4167 | return -EIO; | |
4168 | } else { | |
4169 | qemu_coroutine_yield(); | |
4170 | return co.ret; | |
4171 | } | |
4265d620 PB |
4172 | } else { |
4173 | return 0; | |
4174 | } | |
4175 | } | |
4176 | ||
4177 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4178 | { | |
4179 | Coroutine *co; | |
4180 | RwCo rwco = { | |
4181 | .bs = bs, | |
4182 | .sector_num = sector_num, | |
4183 | .nb_sectors = nb_sectors, | |
4184 | .ret = NOT_DONE, | |
4185 | }; | |
4186 | ||
4187 | if (qemu_in_coroutine()) { | |
4188 | /* Fast-path if already in coroutine context */ | |
4189 | bdrv_discard_co_entry(&rwco); | |
4190 | } else { | |
4191 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4192 | qemu_coroutine_enter(co, &rwco); | |
4193 | while (rwco.ret == NOT_DONE) { | |
4194 | qemu_aio_wait(); | |
4195 | } | |
4196 | } | |
4197 | ||
4198 | return rwco.ret; | |
4199 | } | |
4200 | ||
19cb3738 FB |
4201 | /**************************************************************/ |
4202 | /* removable device support */ | |
4203 | ||
4204 | /** | |
4205 | * Return TRUE if the media is present | |
4206 | */ | |
4207 | int bdrv_is_inserted(BlockDriverState *bs) | |
4208 | { | |
4209 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4210 | |
19cb3738 FB |
4211 | if (!drv) |
4212 | return 0; | |
4213 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4214 | return 1; |
4215 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4216 | } |
4217 | ||
4218 | /** | |
8e49ca46 MA |
4219 | * Return whether the media changed since the last call to this |
4220 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4221 | */ |
4222 | int bdrv_media_changed(BlockDriverState *bs) | |
4223 | { | |
4224 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4225 | |
8e49ca46 MA |
4226 | if (drv && drv->bdrv_media_changed) { |
4227 | return drv->bdrv_media_changed(bs); | |
4228 | } | |
4229 | return -ENOTSUP; | |
19cb3738 FB |
4230 | } |
4231 | ||
4232 | /** | |
4233 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4234 | */ | |
f36f3949 | 4235 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4236 | { |
4237 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4238 | |
822e1cd1 MA |
4239 | if (drv && drv->bdrv_eject) { |
4240 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4241 | } |
6f382ed2 LC |
4242 | |
4243 | if (bs->device_name[0] != '\0') { | |
4244 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4245 | } | |
19cb3738 FB |
4246 | } |
4247 | ||
19cb3738 FB |
4248 | /** |
4249 | * Lock or unlock the media (if it is locked, the user won't be able | |
4250 | * to eject it manually). | |
4251 | */ | |
025e849a | 4252 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4253 | { |
4254 | BlockDriver *drv = bs->drv; | |
4255 | ||
025e849a | 4256 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4257 | |
025e849a MA |
4258 | if (drv && drv->bdrv_lock_medium) { |
4259 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4260 | } |
4261 | } | |
985a03b0 TS |
4262 | |
4263 | /* needed for generic scsi interface */ | |
4264 | ||
4265 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4266 | { | |
4267 | BlockDriver *drv = bs->drv; | |
4268 | ||
4269 | if (drv && drv->bdrv_ioctl) | |
4270 | return drv->bdrv_ioctl(bs, req, buf); | |
4271 | return -ENOTSUP; | |
4272 | } | |
7d780669 | 4273 | |
221f715d AL |
4274 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4275 | unsigned long int req, void *buf, | |
4276 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4277 | { |
221f715d | 4278 | BlockDriver *drv = bs->drv; |
7d780669 | 4279 | |
221f715d AL |
4280 | if (drv && drv->bdrv_aio_ioctl) |
4281 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4282 | return NULL; | |
7d780669 | 4283 | } |
e268ca52 | 4284 | |
7b6f9300 MA |
4285 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4286 | { | |
4287 | bs->buffer_alignment = align; | |
4288 | } | |
7cd1e32a | 4289 | |
e268ca52 AL |
4290 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4291 | { | |
4292 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4293 | } | |
7cd1e32a | 4294 | |
c53b1c51 SH |
4295 | /* |
4296 | * Check if all memory in this vector is sector aligned. | |
4297 | */ | |
4298 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4299 | { | |
4300 | int i; | |
4301 | ||
4302 | for (i = 0; i < qiov->niov; i++) { | |
4303 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4304 | return false; | |
4305 | } | |
4306 | } | |
4307 | ||
4308 | return true; | |
4309 | } | |
4310 | ||
50717e94 | 4311 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity) |
7cd1e32a | 4312 | { |
4313 | int64_t bitmap_size; | |
a55eb92c | 4314 | |
50717e94 PB |
4315 | assert((granularity & (granularity - 1)) == 0); |
4316 | ||
4317 | if (granularity) { | |
4318 | granularity >>= BDRV_SECTOR_BITS; | |
4319 | assert(!bs->dirty_bitmap); | |
4320 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4321 | bs->dirty_bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
7cd1e32a | 4322 | } else { |
c6d22830 | 4323 | if (bs->dirty_bitmap) { |
8f0720ec | 4324 | hbitmap_free(bs->dirty_bitmap); |
c6d22830 | 4325 | bs->dirty_bitmap = NULL; |
a55eb92c | 4326 | } |
7cd1e32a | 4327 | } |
4328 | } | |
4329 | ||
4330 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4331 | { | |
8f0720ec PB |
4332 | if (bs->dirty_bitmap) { |
4333 | return hbitmap_get(bs->dirty_bitmap, sector); | |
7cd1e32a | 4334 | } else { |
4335 | return 0; | |
4336 | } | |
4337 | } | |
4338 | ||
8f0720ec | 4339 | void bdrv_dirty_iter_init(BlockDriverState *bs, HBitmapIter *hbi) |
1755da16 | 4340 | { |
8f0720ec | 4341 | hbitmap_iter_init(hbi, bs->dirty_bitmap, 0); |
1755da16 PB |
4342 | } |
4343 | ||
4344 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4345 | int nr_sectors) | |
4346 | { | |
8f0720ec | 4347 | hbitmap_set(bs->dirty_bitmap, cur_sector, nr_sectors); |
1755da16 PB |
4348 | } |
4349 | ||
a55eb92c JK |
4350 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4351 | int nr_sectors) | |
7cd1e32a | 4352 | { |
8f0720ec | 4353 | hbitmap_reset(bs->dirty_bitmap, cur_sector, nr_sectors); |
7cd1e32a | 4354 | } |
aaa0eb75 LS |
4355 | |
4356 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4357 | { | |
8f0720ec | 4358 | if (bs->dirty_bitmap) { |
acc906c6 | 4359 | return hbitmap_count(bs->dirty_bitmap); |
8f0720ec PB |
4360 | } else { |
4361 | return 0; | |
4362 | } | |
aaa0eb75 | 4363 | } |
f88e1a42 | 4364 | |
9fcb0251 FZ |
4365 | /* Get a reference to bs */ |
4366 | void bdrv_ref(BlockDriverState *bs) | |
4367 | { | |
4368 | bs->refcnt++; | |
4369 | } | |
4370 | ||
4371 | /* Release a previously grabbed reference to bs. | |
4372 | * If after releasing, reference count is zero, the BlockDriverState is | |
4373 | * deleted. */ | |
4374 | void bdrv_unref(BlockDriverState *bs) | |
4375 | { | |
4376 | assert(bs->refcnt > 0); | |
4377 | if (--bs->refcnt == 0) { | |
4378 | bdrv_delete(bs); | |
4379 | } | |
4380 | } | |
4381 | ||
db593f25 MT |
4382 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4383 | { | |
4384 | assert(bs->in_use != in_use); | |
4385 | bs->in_use = in_use; | |
4386 | } | |
4387 | ||
4388 | int bdrv_in_use(BlockDriverState *bs) | |
4389 | { | |
4390 | return bs->in_use; | |
4391 | } | |
4392 | ||
28a7282a LC |
4393 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4394 | { | |
d6bf279e | 4395 | bs->iostatus_enabled = true; |
58e21ef5 | 4396 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4397 | } |
4398 | ||
4399 | /* The I/O status is only enabled if the drive explicitly | |
4400 | * enables it _and_ the VM is configured to stop on errors */ | |
4401 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4402 | { | |
d6bf279e | 4403 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4404 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4405 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4406 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4407 | } |
4408 | ||
4409 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4410 | { | |
d6bf279e | 4411 | bs->iostatus_enabled = false; |
28a7282a LC |
4412 | } |
4413 | ||
4414 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4415 | { | |
4416 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4417 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4418 | if (bs->job) { |
4419 | block_job_iostatus_reset(bs->job); | |
4420 | } | |
28a7282a LC |
4421 | } |
4422 | } | |
4423 | ||
28a7282a LC |
4424 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4425 | { | |
3e1caa5f PB |
4426 | assert(bdrv_iostatus_is_enabled(bs)); |
4427 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4428 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4429 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4430 | } |
4431 | } | |
4432 | ||
a597e79c CH |
4433 | void |
4434 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4435 | enum BlockAcctType type) | |
4436 | { | |
4437 | assert(type < BDRV_MAX_IOTYPE); | |
4438 | ||
4439 | cookie->bytes = bytes; | |
c488c7f6 | 4440 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4441 | cookie->type = type; |
4442 | } | |
4443 | ||
4444 | void | |
4445 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4446 | { | |
4447 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4448 | ||
4449 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4450 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4451 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4452 | } |
4453 | ||
d92ada22 LC |
4454 | void bdrv_img_create(const char *filename, const char *fmt, |
4455 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4456 | char *options, uint64_t img_size, int flags, |
4457 | Error **errp, bool quiet) | |
f88e1a42 JS |
4458 | { |
4459 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4460 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4461 | BlockDriverState *bs = NULL; |
4462 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4463 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4464 | int ret = 0; |
4465 | ||
4466 | /* Find driver and parse its options */ | |
4467 | drv = bdrv_find_format(fmt); | |
4468 | if (!drv) { | |
71c79813 | 4469 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4470 | return; |
f88e1a42 JS |
4471 | } |
4472 | ||
98289620 | 4473 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 4474 | if (!proto_drv) { |
71c79813 | 4475 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4476 | return; |
f88e1a42 JS |
4477 | } |
4478 | ||
4479 | create_options = append_option_parameters(create_options, | |
4480 | drv->create_options); | |
4481 | create_options = append_option_parameters(create_options, | |
4482 | proto_drv->create_options); | |
4483 | ||
4484 | /* Create parameter list with default values */ | |
4485 | param = parse_option_parameters("", create_options, param); | |
4486 | ||
4487 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4488 | ||
4489 | /* Parse -o options */ | |
4490 | if (options) { | |
4491 | param = parse_option_parameters(options, create_options, param); | |
4492 | if (param == NULL) { | |
71c79813 | 4493 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4494 | goto out; |
4495 | } | |
4496 | } | |
4497 | ||
4498 | if (base_filename) { | |
4499 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4500 | base_filename)) { | |
71c79813 LC |
4501 | error_setg(errp, "Backing file not supported for file format '%s'", |
4502 | fmt); | |
f88e1a42 JS |
4503 | goto out; |
4504 | } | |
4505 | } | |
4506 | ||
4507 | if (base_fmt) { | |
4508 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4509 | error_setg(errp, "Backing file format not supported for file " |
4510 | "format '%s'", fmt); | |
f88e1a42 JS |
4511 | goto out; |
4512 | } | |
4513 | } | |
4514 | ||
792da93a JS |
4515 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4516 | if (backing_file && backing_file->value.s) { | |
4517 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4518 | error_setg(errp, "Error: Trying to create an image with the " |
4519 | "same filename as the backing file"); | |
792da93a JS |
4520 | goto out; |
4521 | } | |
4522 | } | |
4523 | ||
f88e1a42 JS |
4524 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4525 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4526 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4527 | if (!backing_drv) { | |
71c79813 LC |
4528 | error_setg(errp, "Unknown backing file format '%s'", |
4529 | backing_fmt->value.s); | |
f88e1a42 JS |
4530 | goto out; |
4531 | } | |
4532 | } | |
4533 | ||
4534 | // The size for the image must always be specified, with one exception: | |
4535 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4536 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4537 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4538 | if (backing_file && backing_file->value.s) { |
4539 | uint64_t size; | |
f88e1a42 | 4540 | char buf[32]; |
63090dac PB |
4541 | int back_flags; |
4542 | ||
4543 | /* backing files always opened read-only */ | |
4544 | back_flags = | |
4545 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4546 | |
f88e1a42 JS |
4547 | bs = bdrv_new(""); |
4548 | ||
de9c0cec | 4549 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
34b5d2c6 | 4550 | backing_drv, NULL); |
f88e1a42 | 4551 | if (ret < 0) { |
71c79813 LC |
4552 | error_setg_errno(errp, -ret, "Could not open '%s'", |
4553 | backing_file->value.s); | |
f88e1a42 JS |
4554 | goto out; |
4555 | } | |
4556 | bdrv_get_geometry(bs, &size); | |
4557 | size *= 512; | |
4558 | ||
4559 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4560 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4561 | } else { | |
71c79813 | 4562 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4563 | goto out; |
4564 | } | |
4565 | } | |
4566 | ||
f382d43a MR |
4567 | if (!quiet) { |
4568 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4569 | print_option_parameters(param); | |
4570 | puts(""); | |
4571 | } | |
f88e1a42 | 4572 | ret = bdrv_create(drv, filename, param); |
f88e1a42 JS |
4573 | if (ret < 0) { |
4574 | if (ret == -ENOTSUP) { | |
71c79813 LC |
4575 | error_setg(errp,"Formatting or formatting option not supported for " |
4576 | "file format '%s'", fmt); | |
f88e1a42 | 4577 | } else if (ret == -EFBIG) { |
f3f4d2c0 KW |
4578 | const char *cluster_size_hint = ""; |
4579 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
4580 | cluster_size_hint = " (try using a larger cluster size)"; | |
4581 | } | |
4582 | error_setg(errp, "The image size is too large for file format '%s'%s", | |
4583 | fmt, cluster_size_hint); | |
f88e1a42 | 4584 | } else { |
71c79813 LC |
4585 | error_setg(errp, "%s: error while creating %s: %s", filename, fmt, |
4586 | strerror(-ret)); | |
f88e1a42 JS |
4587 | } |
4588 | } | |
4589 | ||
4590 | out: | |
4591 | free_option_parameters(create_options); | |
4592 | free_option_parameters(param); | |
4593 | ||
4594 | if (bs) { | |
4f6fd349 | 4595 | bdrv_unref(bs); |
f88e1a42 | 4596 | } |
f88e1a42 | 4597 | } |
85d126f3 SH |
4598 | |
4599 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
4600 | { | |
4601 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
4602 | return qemu_get_aio_context(); | |
4603 | } | |
d616b224 SH |
4604 | |
4605 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
4606 | NotifierWithReturn *notifier) | |
4607 | { | |
4608 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
4609 | } | |
6f176b48 MR |
4610 | |
4611 | int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options) | |
4612 | { | |
4613 | if (bs->drv->bdrv_amend_options == NULL) { | |
4614 | return -ENOTSUP; | |
4615 | } | |
4616 | return bs->drv->bdrv_amend_options(bs, options); | |
4617 | } |