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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
c13163fb | 35 | #include "block/qapi.h" |
b2023818 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
fc01f7e7 | 38 | |
71e72a19 | 39 | #ifdef CONFIG_BSD |
7674e7bf FB |
40 | #include <sys/types.h> |
41 | #include <sys/stat.h> | |
42 | #include <sys/ioctl.h> | |
72cf2d4f | 43 | #include <sys/queue.h> |
c5e97233 | 44 | #ifndef __DragonFly__ |
7674e7bf FB |
45 | #include <sys/disk.h> |
46 | #endif | |
c5e97233 | 47 | #endif |
7674e7bf | 48 | |
49dc768d AL |
49 | #ifdef _WIN32 |
50 | #include <windows.h> | |
51 | #endif | |
52 | ||
e4654d2d FZ |
53 | struct BdrvDirtyBitmap { |
54 | HBitmap *bitmap; | |
55 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
56 | }; | |
57 | ||
1c9805a3 SH |
58 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
59 | ||
7d4b4ba5 | 60 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
61 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
62 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 63 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
64 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 66 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
67 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
68 | int64_t sector_num, int nb_sectors, | |
69 | QEMUIOVector *iov); | |
70 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
71 | int64_t sector_num, int nb_sectors, | |
72 | QEMUIOVector *iov); | |
775aa8b6 KW |
73 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
74 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
470c0504 | 75 | BdrvRequestFlags flags); |
775aa8b6 KW |
76 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
f08f2dda | 78 | BdrvRequestFlags flags); |
b2a61371 SH |
79 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
80 | int64_t sector_num, | |
81 | QEMUIOVector *qiov, | |
82 | int nb_sectors, | |
d20d9b7c | 83 | BdrvRequestFlags flags, |
b2a61371 SH |
84 | BlockDriverCompletionFunc *cb, |
85 | void *opaque, | |
8c5873d6 | 86 | bool is_write); |
b2a61371 | 87 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 88 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 89 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 90 | |
1b7bdbc1 SH |
91 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
92 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 93 | |
dc364f4c BC |
94 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
95 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
96 | ||
8a22f02a SH |
97 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
98 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 99 | |
eb852011 MA |
100 | /* If non-zero, use only whitelisted block drivers */ |
101 | static int use_bdrv_whitelist; | |
102 | ||
9e0b22f4 SH |
103 | #ifdef _WIN32 |
104 | static int is_windows_drive_prefix(const char *filename) | |
105 | { | |
106 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
107 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
108 | filename[1] == ':'); | |
109 | } | |
110 | ||
111 | int is_windows_drive(const char *filename) | |
112 | { | |
113 | if (is_windows_drive_prefix(filename) && | |
114 | filename[2] == '\0') | |
115 | return 1; | |
116 | if (strstart(filename, "\\\\.\\", NULL) || | |
117 | strstart(filename, "//./", NULL)) | |
118 | return 1; | |
119 | return 0; | |
120 | } | |
121 | #endif | |
122 | ||
0563e191 | 123 | /* throttling disk I/O limits */ |
cc0681c4 BC |
124 | void bdrv_set_io_limits(BlockDriverState *bs, |
125 | ThrottleConfig *cfg) | |
98f90dba | 126 | { |
cc0681c4 | 127 | int i; |
98f90dba | 128 | |
cc0681c4 | 129 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 130 | |
cc0681c4 BC |
131 | for (i = 0; i < 2; i++) { |
132 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 133 | } |
cc0681c4 BC |
134 | } |
135 | ||
136 | /* this function drain all the throttled IOs */ | |
137 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
138 | { | |
139 | bool drained = false; | |
140 | bool enabled = bs->io_limits_enabled; | |
141 | int i; | |
142 | ||
143 | bs->io_limits_enabled = false; | |
144 | ||
145 | for (i = 0; i < 2; i++) { | |
146 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
147 | drained = true; | |
148 | } | |
149 | } | |
150 | ||
151 | bs->io_limits_enabled = enabled; | |
98f90dba | 152 | |
cc0681c4 | 153 | return drained; |
98f90dba ZYW |
154 | } |
155 | ||
cc0681c4 | 156 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 157 | { |
cc0681c4 | 158 | bs->io_limits_enabled = false; |
0563e191 | 159 | |
cc0681c4 BC |
160 | bdrv_start_throttled_reqs(bs); |
161 | ||
162 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
163 | } |
164 | ||
cc0681c4 | 165 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 166 | { |
cc0681c4 BC |
167 | BlockDriverState *bs = opaque; |
168 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
169 | } |
170 | ||
cc0681c4 | 171 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 172 | { |
cc0681c4 BC |
173 | BlockDriverState *bs = opaque; |
174 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
175 | } |
176 | ||
cc0681c4 BC |
177 | /* should be called before bdrv_set_io_limits if a limit is set */ |
178 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
179 | { | |
180 | assert(!bs->io_limits_enabled); | |
181 | throttle_init(&bs->throttle_state, | |
182 | QEMU_CLOCK_VIRTUAL, | |
183 | bdrv_throttle_read_timer_cb, | |
184 | bdrv_throttle_write_timer_cb, | |
185 | bs); | |
186 | bs->io_limits_enabled = true; | |
187 | } | |
188 | ||
189 | /* This function makes an IO wait if needed | |
190 | * | |
191 | * @nb_sectors: the number of sectors of the IO | |
192 | * @is_write: is the IO a write | |
193 | */ | |
98f90dba | 194 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 195 | unsigned int bytes, |
cc0681c4 | 196 | bool is_write) |
98f90dba | 197 | { |
cc0681c4 BC |
198 | /* does this io must wait */ |
199 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 200 | |
cc0681c4 BC |
201 | /* if must wait or any request of this type throttled queue the IO */ |
202 | if (must_wait || | |
203 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
204 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
205 | } |
206 | ||
cc0681c4 | 207 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
208 | throttle_account(&bs->throttle_state, is_write, bytes); |
209 | ||
98f90dba | 210 | |
cc0681c4 BC |
211 | /* if the next request must wait -> do nothing */ |
212 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
213 | return; | |
98f90dba ZYW |
214 | } |
215 | ||
cc0681c4 BC |
216 | /* else queue next request for execution */ |
217 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
218 | } |
219 | ||
339064d5 KW |
220 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
221 | { | |
222 | if (!bs || !bs->drv) { | |
223 | /* 4k should be on the safe side */ | |
224 | return 4096; | |
225 | } | |
226 | ||
227 | return bs->bl.opt_mem_alignment; | |
228 | } | |
229 | ||
9e0b22f4 SH |
230 | /* check if the path starts with "<protocol>:" */ |
231 | static int path_has_protocol(const char *path) | |
232 | { | |
947995c0 PB |
233 | const char *p; |
234 | ||
9e0b22f4 SH |
235 | #ifdef _WIN32 |
236 | if (is_windows_drive(path) || | |
237 | is_windows_drive_prefix(path)) { | |
238 | return 0; | |
239 | } | |
947995c0 PB |
240 | p = path + strcspn(path, ":/\\"); |
241 | #else | |
242 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
243 | #endif |
244 | ||
947995c0 | 245 | return *p == ':'; |
9e0b22f4 SH |
246 | } |
247 | ||
83f64091 | 248 | int path_is_absolute(const char *path) |
3b0d4f61 | 249 | { |
21664424 FB |
250 | #ifdef _WIN32 |
251 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 252 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 253 | return 1; |
f53f4da9 PB |
254 | } |
255 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 256 | #else |
f53f4da9 | 257 | return (*path == '/'); |
3b9f94e1 | 258 | #endif |
3b0d4f61 FB |
259 | } |
260 | ||
83f64091 FB |
261 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
262 | path to it by considering it is relative to base_path. URL are | |
263 | supported. */ | |
264 | void path_combine(char *dest, int dest_size, | |
265 | const char *base_path, | |
266 | const char *filename) | |
3b0d4f61 | 267 | { |
83f64091 FB |
268 | const char *p, *p1; |
269 | int len; | |
270 | ||
271 | if (dest_size <= 0) | |
272 | return; | |
273 | if (path_is_absolute(filename)) { | |
274 | pstrcpy(dest, dest_size, filename); | |
275 | } else { | |
276 | p = strchr(base_path, ':'); | |
277 | if (p) | |
278 | p++; | |
279 | else | |
280 | p = base_path; | |
3b9f94e1 FB |
281 | p1 = strrchr(base_path, '/'); |
282 | #ifdef _WIN32 | |
283 | { | |
284 | const char *p2; | |
285 | p2 = strrchr(base_path, '\\'); | |
286 | if (!p1 || p2 > p1) | |
287 | p1 = p2; | |
288 | } | |
289 | #endif | |
83f64091 FB |
290 | if (p1) |
291 | p1++; | |
292 | else | |
293 | p1 = base_path; | |
294 | if (p1 > p) | |
295 | p = p1; | |
296 | len = p - base_path; | |
297 | if (len > dest_size - 1) | |
298 | len = dest_size - 1; | |
299 | memcpy(dest, base_path, len); | |
300 | dest[len] = '\0'; | |
301 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 302 | } |
3b0d4f61 FB |
303 | } |
304 | ||
dc5a1371 PB |
305 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
306 | { | |
307 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
308 | pstrcpy(dest, sz, bs->backing_file); | |
309 | } else { | |
310 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
311 | } | |
312 | } | |
313 | ||
5efa9d5a | 314 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 315 | { |
8c5873d6 SH |
316 | /* Block drivers without coroutine functions need emulation */ |
317 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
318 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
319 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
320 | ||
f8c35c1d SH |
321 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
322 | * the block driver lacks aio we need to emulate that too. | |
323 | */ | |
f9f05dc5 KW |
324 | if (!bdrv->bdrv_aio_readv) { |
325 | /* add AIO emulation layer */ | |
326 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
327 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 328 | } |
83f64091 | 329 | } |
b2e12bc6 | 330 | |
8a22f02a | 331 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 332 | } |
b338082b FB |
333 | |
334 | /* create a new block device (by default it is empty) */ | |
98522f63 | 335 | BlockDriverState *bdrv_new(const char *device_name, Error **errp) |
b338082b | 336 | { |
1b7bdbc1 | 337 | BlockDriverState *bs; |
fbe40ff7 | 338 | int i; |
b338082b | 339 | |
f2d953ec KW |
340 | if (bdrv_find(device_name)) { |
341 | error_setg(errp, "Device with id '%s' already exists", | |
342 | device_name); | |
343 | return NULL; | |
344 | } | |
345 | if (bdrv_find_node(device_name)) { | |
346 | error_setg(errp, "Device with node-name '%s' already exists", | |
347 | device_name); | |
348 | return NULL; | |
349 | } | |
350 | ||
7267c094 | 351 | bs = g_malloc0(sizeof(BlockDriverState)); |
e4654d2d | 352 | QLIST_INIT(&bs->dirty_bitmaps); |
b338082b | 353 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 354 | if (device_name[0] != '\0') { |
dc364f4c | 355 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
ea2384d3 | 356 | } |
fbe40ff7 FZ |
357 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
358 | QLIST_INIT(&bs->op_blockers[i]); | |
359 | } | |
28a7282a | 360 | bdrv_iostatus_disable(bs); |
d7d512f6 | 361 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 362 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
363 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
364 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 365 | bs->refcnt = 1; |
d7d512f6 | 366 | |
b338082b FB |
367 | return bs; |
368 | } | |
369 | ||
d7d512f6 PB |
370 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
371 | { | |
372 | notifier_list_add(&bs->close_notifiers, notify); | |
373 | } | |
374 | ||
ea2384d3 FB |
375 | BlockDriver *bdrv_find_format(const char *format_name) |
376 | { | |
377 | BlockDriver *drv1; | |
8a22f02a SH |
378 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
379 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 380 | return drv1; |
8a22f02a | 381 | } |
ea2384d3 FB |
382 | } |
383 | return NULL; | |
384 | } | |
385 | ||
b64ec4e4 | 386 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 387 | { |
b64ec4e4 FZ |
388 | static const char *whitelist_rw[] = { |
389 | CONFIG_BDRV_RW_WHITELIST | |
390 | }; | |
391 | static const char *whitelist_ro[] = { | |
392 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
393 | }; |
394 | const char **p; | |
395 | ||
b64ec4e4 | 396 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 397 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 398 | } |
eb852011 | 399 | |
b64ec4e4 | 400 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
401 | if (!strcmp(drv->format_name, *p)) { |
402 | return 1; | |
403 | } | |
404 | } | |
b64ec4e4 FZ |
405 | if (read_only) { |
406 | for (p = whitelist_ro; *p; p++) { | |
407 | if (!strcmp(drv->format_name, *p)) { | |
408 | return 1; | |
409 | } | |
410 | } | |
411 | } | |
eb852011 MA |
412 | return 0; |
413 | } | |
414 | ||
b64ec4e4 FZ |
415 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
416 | bool read_only) | |
eb852011 MA |
417 | { |
418 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 419 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
420 | } |
421 | ||
5b7e1542 ZYW |
422 | typedef struct CreateCo { |
423 | BlockDriver *drv; | |
424 | char *filename; | |
425 | QEMUOptionParameter *options; | |
426 | int ret; | |
cc84d90f | 427 | Error *err; |
5b7e1542 ZYW |
428 | } CreateCo; |
429 | ||
430 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
431 | { | |
cc84d90f HR |
432 | Error *local_err = NULL; |
433 | int ret; | |
434 | ||
5b7e1542 ZYW |
435 | CreateCo *cco = opaque; |
436 | assert(cco->drv); | |
437 | ||
cc84d90f | 438 | ret = cco->drv->bdrv_create(cco->filename, cco->options, &local_err); |
84d18f06 | 439 | if (local_err) { |
cc84d90f HR |
440 | error_propagate(&cco->err, local_err); |
441 | } | |
442 | cco->ret = ret; | |
5b7e1542 ZYW |
443 | } |
444 | ||
0e7e1989 | 445 | int bdrv_create(BlockDriver *drv, const char* filename, |
cc84d90f | 446 | QEMUOptionParameter *options, Error **errp) |
ea2384d3 | 447 | { |
5b7e1542 ZYW |
448 | int ret; |
449 | ||
450 | Coroutine *co; | |
451 | CreateCo cco = { | |
452 | .drv = drv, | |
453 | .filename = g_strdup(filename), | |
454 | .options = options, | |
455 | .ret = NOT_DONE, | |
cc84d90f | 456 | .err = NULL, |
5b7e1542 ZYW |
457 | }; |
458 | ||
459 | if (!drv->bdrv_create) { | |
cc84d90f | 460 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
461 | ret = -ENOTSUP; |
462 | goto out; | |
5b7e1542 ZYW |
463 | } |
464 | ||
465 | if (qemu_in_coroutine()) { | |
466 | /* Fast-path if already in coroutine context */ | |
467 | bdrv_create_co_entry(&cco); | |
468 | } else { | |
469 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
470 | qemu_coroutine_enter(co, &cco); | |
471 | while (cco.ret == NOT_DONE) { | |
472 | qemu_aio_wait(); | |
473 | } | |
474 | } | |
475 | ||
476 | ret = cco.ret; | |
cc84d90f | 477 | if (ret < 0) { |
84d18f06 | 478 | if (cco.err) { |
cc84d90f HR |
479 | error_propagate(errp, cco.err); |
480 | } else { | |
481 | error_setg_errno(errp, -ret, "Could not create image"); | |
482 | } | |
483 | } | |
0e7e1989 | 484 | |
80168bff LC |
485 | out: |
486 | g_free(cco.filename); | |
5b7e1542 | 487 | return ret; |
ea2384d3 FB |
488 | } |
489 | ||
cc84d90f HR |
490 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options, |
491 | Error **errp) | |
84a12e66 CH |
492 | { |
493 | BlockDriver *drv; | |
cc84d90f HR |
494 | Error *local_err = NULL; |
495 | int ret; | |
84a12e66 | 496 | |
98289620 | 497 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 498 | if (drv == NULL) { |
cc84d90f | 499 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 500 | return -ENOENT; |
84a12e66 CH |
501 | } |
502 | ||
cc84d90f | 503 | ret = bdrv_create(drv, filename, options, &local_err); |
84d18f06 | 504 | if (local_err) { |
cc84d90f HR |
505 | error_propagate(errp, local_err); |
506 | } | |
507 | return ret; | |
84a12e66 CH |
508 | } |
509 | ||
355ef4ac | 510 | int bdrv_refresh_limits(BlockDriverState *bs) |
d34682cd KW |
511 | { |
512 | BlockDriver *drv = bs->drv; | |
513 | ||
514 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
515 | ||
466ad822 KW |
516 | if (!drv) { |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* Take some limits from the children as a default */ | |
521 | if (bs->file) { | |
522 | bdrv_refresh_limits(bs->file); | |
523 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; | |
339064d5 KW |
524 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
525 | } else { | |
526 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
527 | } |
528 | ||
529 | if (bs->backing_hd) { | |
530 | bdrv_refresh_limits(bs->backing_hd); | |
531 | bs->bl.opt_transfer_length = | |
532 | MAX(bs->bl.opt_transfer_length, | |
533 | bs->backing_hd->bl.opt_transfer_length); | |
339064d5 KW |
534 | bs->bl.opt_mem_alignment = |
535 | MAX(bs->bl.opt_mem_alignment, | |
536 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
537 | } |
538 | ||
539 | /* Then let the driver override it */ | |
540 | if (drv->bdrv_refresh_limits) { | |
d34682cd KW |
541 | return drv->bdrv_refresh_limits(bs); |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
eba25057 JM |
547 | /* |
548 | * Create a uniquely-named empty temporary file. | |
549 | * Return 0 upon success, otherwise a negative errno value. | |
550 | */ | |
551 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 552 | { |
eba25057 | 553 | #ifdef _WIN32 |
3b9f94e1 | 554 | char temp_dir[MAX_PATH]; |
eba25057 JM |
555 | /* GetTempFileName requires that its output buffer (4th param) |
556 | have length MAX_PATH or greater. */ | |
557 | assert(size >= MAX_PATH); | |
558 | return (GetTempPath(MAX_PATH, temp_dir) | |
559 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
560 | ? 0 : -GetLastError()); | |
d5249393 | 561 | #else |
67b915a5 | 562 | int fd; |
7ccfb2eb | 563 | const char *tmpdir; |
0badc1ee | 564 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
565 | if (!tmpdir) { |
566 | tmpdir = "/var/tmp"; | |
567 | } | |
eba25057 JM |
568 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
569 | return -EOVERFLOW; | |
570 | } | |
ea2384d3 | 571 | fd = mkstemp(filename); |
fe235a06 DH |
572 | if (fd < 0) { |
573 | return -errno; | |
574 | } | |
575 | if (close(fd) != 0) { | |
576 | unlink(filename); | |
eba25057 JM |
577 | return -errno; |
578 | } | |
579 | return 0; | |
d5249393 | 580 | #endif |
eba25057 | 581 | } |
fc01f7e7 | 582 | |
84a12e66 CH |
583 | /* |
584 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
585 | * recognized as a host CDROM. | |
586 | */ | |
587 | static BlockDriver *find_hdev_driver(const char *filename) | |
588 | { | |
589 | int score_max = 0, score; | |
590 | BlockDriver *drv = NULL, *d; | |
591 | ||
592 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
593 | if (d->bdrv_probe_device) { | |
594 | score = d->bdrv_probe_device(filename); | |
595 | if (score > score_max) { | |
596 | score_max = score; | |
597 | drv = d; | |
598 | } | |
599 | } | |
600 | } | |
601 | ||
602 | return drv; | |
603 | } | |
604 | ||
98289620 KW |
605 | BlockDriver *bdrv_find_protocol(const char *filename, |
606 | bool allow_protocol_prefix) | |
83f64091 FB |
607 | { |
608 | BlockDriver *drv1; | |
609 | char protocol[128]; | |
1cec71e3 | 610 | int len; |
83f64091 | 611 | const char *p; |
19cb3738 | 612 | |
66f82cee KW |
613 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
614 | ||
39508e7a CH |
615 | /* |
616 | * XXX(hch): we really should not let host device detection | |
617 | * override an explicit protocol specification, but moving this | |
618 | * later breaks access to device names with colons in them. | |
619 | * Thanks to the brain-dead persistent naming schemes on udev- | |
620 | * based Linux systems those actually are quite common. | |
621 | */ | |
622 | drv1 = find_hdev_driver(filename); | |
623 | if (drv1) { | |
624 | return drv1; | |
625 | } | |
626 | ||
98289620 | 627 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 628 | return bdrv_find_format("file"); |
84a12e66 | 629 | } |
98289620 | 630 | |
9e0b22f4 SH |
631 | p = strchr(filename, ':'); |
632 | assert(p != NULL); | |
1cec71e3 AL |
633 | len = p - filename; |
634 | if (len > sizeof(protocol) - 1) | |
635 | len = sizeof(protocol) - 1; | |
636 | memcpy(protocol, filename, len); | |
637 | protocol[len] = '\0'; | |
8a22f02a | 638 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 639 | if (drv1->protocol_name && |
8a22f02a | 640 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 641 | return drv1; |
8a22f02a | 642 | } |
83f64091 FB |
643 | } |
644 | return NULL; | |
645 | } | |
646 | ||
f500a6d3 | 647 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 648 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 649 | { |
f500a6d3 | 650 | int score, score_max; |
f3a5d3f8 CH |
651 | BlockDriver *drv1, *drv; |
652 | uint8_t buf[2048]; | |
f500a6d3 | 653 | int ret = 0; |
f8ea0b00 | 654 | |
08a00559 | 655 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 656 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
657 | drv = bdrv_find_format("raw"); |
658 | if (!drv) { | |
34b5d2c6 | 659 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
660 | ret = -ENOENT; |
661 | } | |
662 | *pdrv = drv; | |
663 | return ret; | |
1a396859 | 664 | } |
f8ea0b00 | 665 | |
83f64091 | 666 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 667 | if (ret < 0) { |
34b5d2c6 HR |
668 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
669 | "format"); | |
c98ac35d SW |
670 | *pdrv = NULL; |
671 | return ret; | |
83f64091 FB |
672 | } |
673 | ||
ea2384d3 | 674 | score_max = 0; |
84a12e66 | 675 | drv = NULL; |
8a22f02a | 676 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
677 | if (drv1->bdrv_probe) { |
678 | score = drv1->bdrv_probe(buf, ret, filename); | |
679 | if (score > score_max) { | |
680 | score_max = score; | |
681 | drv = drv1; | |
682 | } | |
0849bf08 | 683 | } |
fc01f7e7 | 684 | } |
c98ac35d | 685 | if (!drv) { |
34b5d2c6 HR |
686 | error_setg(errp, "Could not determine image format: No compatible " |
687 | "driver found"); | |
c98ac35d SW |
688 | ret = -ENOENT; |
689 | } | |
690 | *pdrv = drv; | |
691 | return ret; | |
ea2384d3 FB |
692 | } |
693 | ||
51762288 SH |
694 | /** |
695 | * Set the current 'total_sectors' value | |
696 | */ | |
697 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
698 | { | |
699 | BlockDriver *drv = bs->drv; | |
700 | ||
396759ad NB |
701 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
702 | if (bs->sg) | |
703 | return 0; | |
704 | ||
51762288 SH |
705 | /* query actual device if possible, otherwise just trust the hint */ |
706 | if (drv->bdrv_getlength) { | |
707 | int64_t length = drv->bdrv_getlength(bs); | |
708 | if (length < 0) { | |
709 | return length; | |
710 | } | |
7e382003 | 711 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
712 | } |
713 | ||
714 | bs->total_sectors = hint; | |
715 | return 0; | |
716 | } | |
717 | ||
9e8f1835 PB |
718 | /** |
719 | * Set open flags for a given discard mode | |
720 | * | |
721 | * Return 0 on success, -1 if the discard mode was invalid. | |
722 | */ | |
723 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
724 | { | |
725 | *flags &= ~BDRV_O_UNMAP; | |
726 | ||
727 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
728 | /* do nothing */ | |
729 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
730 | *flags |= BDRV_O_UNMAP; | |
731 | } else { | |
732 | return -1; | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
c3993cdc SH |
738 | /** |
739 | * Set open flags for a given cache mode | |
740 | * | |
741 | * Return 0 on success, -1 if the cache mode was invalid. | |
742 | */ | |
743 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
744 | { | |
745 | *flags &= ~BDRV_O_CACHE_MASK; | |
746 | ||
747 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
748 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
749 | } else if (!strcmp(mode, "directsync")) { |
750 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
751 | } else if (!strcmp(mode, "writeback")) { |
752 | *flags |= BDRV_O_CACHE_WB; | |
753 | } else if (!strcmp(mode, "unsafe")) { | |
754 | *flags |= BDRV_O_CACHE_WB; | |
755 | *flags |= BDRV_O_NO_FLUSH; | |
756 | } else if (!strcmp(mode, "writethrough")) { | |
757 | /* this is the default */ | |
758 | } else { | |
759 | return -1; | |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
53fec9d3 SH |
765 | /** |
766 | * The copy-on-read flag is actually a reference count so multiple users may | |
767 | * use the feature without worrying about clobbering its previous state. | |
768 | * Copy-on-read stays enabled until all users have called to disable it. | |
769 | */ | |
770 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
771 | { | |
772 | bs->copy_on_read++; | |
773 | } | |
774 | ||
775 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
776 | { | |
777 | assert(bs->copy_on_read > 0); | |
778 | bs->copy_on_read--; | |
779 | } | |
780 | ||
b1e6fc08 KW |
781 | /* |
782 | * Returns the flags that a temporary snapshot should get, based on the | |
783 | * originally requested flags (the originally requested image will have flags | |
784 | * like a backing file) | |
785 | */ | |
786 | static int bdrv_temp_snapshot_flags(int flags) | |
787 | { | |
788 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; | |
789 | } | |
790 | ||
0b50cc88 KW |
791 | /* |
792 | * Returns the flags that bs->file should get, based on the given flags for | |
793 | * the parent BDS | |
794 | */ | |
795 | static int bdrv_inherited_flags(int flags) | |
796 | { | |
797 | /* Enable protocol handling, disable format probing for bs->file */ | |
798 | flags |= BDRV_O_PROTOCOL; | |
799 | ||
800 | /* Our block drivers take care to send flushes and respect unmap policy, | |
801 | * so we can enable both unconditionally on lower layers. */ | |
802 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; | |
803 | ||
0b50cc88 | 804 | /* Clear flags that only apply to the top layer */ |
5669b44d | 805 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
0b50cc88 KW |
806 | |
807 | return flags; | |
808 | } | |
809 | ||
317fc44e KW |
810 | /* |
811 | * Returns the flags that bs->backing_hd should get, based on the given flags | |
812 | * for the parent BDS | |
813 | */ | |
814 | static int bdrv_backing_flags(int flags) | |
815 | { | |
816 | /* backing files always opened read-only */ | |
817 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); | |
818 | ||
819 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 820 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e KW |
821 | |
822 | return flags; | |
823 | } | |
824 | ||
7b272452 KW |
825 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
826 | { | |
827 | int open_flags = flags | BDRV_O_CACHE_WB; | |
828 | ||
829 | /* | |
830 | * Clear flags that are internal to the block layer before opening the | |
831 | * image. | |
832 | */ | |
833 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
834 | ||
835 | /* | |
836 | * Snapshots should be writable. | |
837 | */ | |
8bfea15d | 838 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
839 | open_flags |= BDRV_O_RDWR; |
840 | } | |
841 | ||
842 | return open_flags; | |
843 | } | |
844 | ||
636ea370 KW |
845 | static void bdrv_assign_node_name(BlockDriverState *bs, |
846 | const char *node_name, | |
847 | Error **errp) | |
6913c0c2 BC |
848 | { |
849 | if (!node_name) { | |
636ea370 | 850 | return; |
6913c0c2 BC |
851 | } |
852 | ||
853 | /* empty string node name is invalid */ | |
854 | if (node_name[0] == '\0') { | |
855 | error_setg(errp, "Empty node name"); | |
636ea370 | 856 | return; |
6913c0c2 BC |
857 | } |
858 | ||
0c5e94ee BC |
859 | /* takes care of avoiding namespaces collisions */ |
860 | if (bdrv_find(node_name)) { | |
861 | error_setg(errp, "node-name=%s is conflicting with a device id", | |
862 | node_name); | |
636ea370 | 863 | return; |
0c5e94ee BC |
864 | } |
865 | ||
6913c0c2 BC |
866 | /* takes care of avoiding duplicates node names */ |
867 | if (bdrv_find_node(node_name)) { | |
868 | error_setg(errp, "Duplicate node name"); | |
636ea370 | 869 | return; |
6913c0c2 BC |
870 | } |
871 | ||
872 | /* copy node name into the bs and insert it into the graph list */ | |
873 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
874 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
6913c0c2 BC |
875 | } |
876 | ||
57915332 KW |
877 | /* |
878 | * Common part for opening disk images and files | |
b6ad491a KW |
879 | * |
880 | * Removes all processed options from *options. | |
57915332 | 881 | */ |
f500a6d3 | 882 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 883 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
884 | { |
885 | int ret, open_flags; | |
035fccdf | 886 | const char *filename; |
6913c0c2 | 887 | const char *node_name = NULL; |
34b5d2c6 | 888 | Error *local_err = NULL; |
57915332 KW |
889 | |
890 | assert(drv != NULL); | |
6405875c | 891 | assert(bs->file == NULL); |
707ff828 | 892 | assert(options != NULL && bs->options != options); |
57915332 | 893 | |
45673671 KW |
894 | if (file != NULL) { |
895 | filename = file->filename; | |
896 | } else { | |
897 | filename = qdict_get_try_str(options, "filename"); | |
898 | } | |
899 | ||
765003db KW |
900 | if (drv->bdrv_needs_filename && !filename) { |
901 | error_setg(errp, "The '%s' block driver requires a file name", | |
902 | drv->format_name); | |
903 | return -EINVAL; | |
904 | } | |
905 | ||
45673671 | 906 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 907 | |
6913c0c2 | 908 | node_name = qdict_get_try_str(options, "node-name"); |
636ea370 | 909 | bdrv_assign_node_name(bs, node_name, &local_err); |
0fb6395c | 910 | if (local_err) { |
636ea370 KW |
911 | error_propagate(errp, local_err); |
912 | return -EINVAL; | |
6913c0c2 BC |
913 | } |
914 | qdict_del(options, "node-name"); | |
915 | ||
5d186eb0 KW |
916 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
917 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
918 | * and return immediately. */ | |
919 | if (file != NULL && drv->bdrv_file_open) { | |
920 | bdrv_swap(file, bs); | |
921 | return 0; | |
922 | } | |
923 | ||
57915332 | 924 | bs->open_flags = flags; |
1b7fd729 | 925 | bs->guest_block_size = 512; |
c25f53b0 | 926 | bs->request_alignment = 512; |
0d51b4de | 927 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
928 | open_flags = bdrv_open_flags(bs, flags); |
929 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
930 | ||
931 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
932 | error_setg(errp, |
933 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
934 | ? "Driver '%s' can only be used for read-only devices" | |
935 | : "Driver '%s' is not whitelisted", | |
936 | drv->format_name); | |
b64ec4e4 FZ |
937 | return -ENOTSUP; |
938 | } | |
57915332 | 939 | |
53fec9d3 | 940 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
941 | if (flags & BDRV_O_COPY_ON_READ) { |
942 | if (!bs->read_only) { | |
943 | bdrv_enable_copy_on_read(bs); | |
944 | } else { | |
945 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
946 | return -EINVAL; | |
947 | } | |
53fec9d3 SH |
948 | } |
949 | ||
c2ad1b0c KW |
950 | if (filename != NULL) { |
951 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
952 | } else { | |
953 | bs->filename[0] = '\0'; | |
954 | } | |
57915332 | 955 | |
57915332 | 956 | bs->drv = drv; |
7267c094 | 957 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 958 | |
03f541bd | 959 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 960 | |
66f82cee KW |
961 | /* Open the image, either directly or using a protocol */ |
962 | if (drv->bdrv_file_open) { | |
5d186eb0 | 963 | assert(file == NULL); |
030be321 | 964 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 965 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 966 | } else { |
2af5ef70 | 967 | if (file == NULL) { |
34b5d2c6 HR |
968 | error_setg(errp, "Can't use '%s' as a block driver for the " |
969 | "protocol level", drv->format_name); | |
2af5ef70 KW |
970 | ret = -EINVAL; |
971 | goto free_and_fail; | |
972 | } | |
f500a6d3 | 973 | bs->file = file; |
34b5d2c6 | 974 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
975 | } |
976 | ||
57915332 | 977 | if (ret < 0) { |
84d18f06 | 978 | if (local_err) { |
34b5d2c6 | 979 | error_propagate(errp, local_err); |
2fa9aa59 DH |
980 | } else if (bs->filename[0]) { |
981 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
982 | } else { |
983 | error_setg_errno(errp, -ret, "Could not open image"); | |
984 | } | |
57915332 KW |
985 | goto free_and_fail; |
986 | } | |
987 | ||
51762288 SH |
988 | ret = refresh_total_sectors(bs, bs->total_sectors); |
989 | if (ret < 0) { | |
34b5d2c6 | 990 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 991 | goto free_and_fail; |
57915332 | 992 | } |
51762288 | 993 | |
d34682cd | 994 | bdrv_refresh_limits(bs); |
c25f53b0 | 995 | assert(bdrv_opt_mem_align(bs) != 0); |
47ea2de2 | 996 | assert((bs->request_alignment != 0) || bs->sg); |
57915332 KW |
997 | return 0; |
998 | ||
999 | free_and_fail: | |
f500a6d3 | 1000 | bs->file = NULL; |
7267c094 | 1001 | g_free(bs->opaque); |
57915332 KW |
1002 | bs->opaque = NULL; |
1003 | bs->drv = NULL; | |
1004 | return ret; | |
1005 | } | |
1006 | ||
b6ce07aa KW |
1007 | /* |
1008 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 | 1009 | * |
5acd9d81 HR |
1010 | * options is an indirect pointer to a QDict of options to pass to the block |
1011 | * drivers, or pointer to NULL for an empty set of options. If this function | |
1012 | * takes ownership of the QDict reference, it will set *options to NULL; | |
1013 | * otherwise, it will contain unused/unrecognized options after this function | |
1014 | * returns. Then, the caller is responsible for freeing it. If it intends to | |
1015 | * reuse the QDict, QINCREF() should be called beforehand. | |
b6ce07aa | 1016 | */ |
d4446eae | 1017 | static int bdrv_file_open(BlockDriverState *bs, const char *filename, |
5acd9d81 | 1018 | QDict **options, int flags, Error **errp) |
ea2384d3 | 1019 | { |
6db95603 | 1020 | BlockDriver *drv; |
c2ad1b0c | 1021 | const char *drvname; |
e3fa4bfa | 1022 | bool parse_filename = false; |
34b5d2c6 | 1023 | Error *local_err = NULL; |
83f64091 FB |
1024 | int ret; |
1025 | ||
035fccdf KW |
1026 | /* Fetch the file name from the options QDict if necessary */ |
1027 | if (!filename) { | |
5acd9d81 HR |
1028 | filename = qdict_get_try_str(*options, "filename"); |
1029 | } else if (filename && !qdict_haskey(*options, "filename")) { | |
1030 | qdict_put(*options, "filename", qstring_from_str(filename)); | |
e3fa4bfa | 1031 | parse_filename = true; |
035fccdf | 1032 | } else { |
34b5d2c6 HR |
1033 | error_setg(errp, "Can't specify 'file' and 'filename' options at the " |
1034 | "same time"); | |
035fccdf KW |
1035 | ret = -EINVAL; |
1036 | goto fail; | |
1037 | } | |
1038 | ||
c2ad1b0c | 1039 | /* Find the right block driver */ |
5acd9d81 | 1040 | drvname = qdict_get_try_str(*options, "driver"); |
c2ad1b0c | 1041 | if (drvname) { |
8f94a6e4 | 1042 | drv = bdrv_find_format(drvname); |
34b5d2c6 HR |
1043 | if (!drv) { |
1044 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1045 | } | |
5acd9d81 | 1046 | qdict_del(*options, "driver"); |
c2ad1b0c | 1047 | } else if (filename) { |
e3fa4bfa | 1048 | drv = bdrv_find_protocol(filename, parse_filename); |
98289620 | 1049 | if (!drv) { |
34b5d2c6 | 1050 | error_setg(errp, "Unknown protocol"); |
98289620 | 1051 | } |
c2ad1b0c | 1052 | } else { |
34b5d2c6 | 1053 | error_setg(errp, "Must specify either driver or file"); |
c2ad1b0c KW |
1054 | drv = NULL; |
1055 | } | |
1056 | ||
1057 | if (!drv) { | |
34b5d2c6 | 1058 | /* errp has been set already */ |
c2ad1b0c KW |
1059 | ret = -ENOENT; |
1060 | goto fail; | |
1061 | } | |
1062 | ||
1063 | /* Parse the filename and open it */ | |
e3fa4bfa | 1064 | if (drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1065 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1066 | if (local_err) { |
34b5d2c6 | 1067 | error_propagate(errp, local_err); |
6963a30d KW |
1068 | ret = -EINVAL; |
1069 | goto fail; | |
1070 | } | |
cd5d031e HR |
1071 | |
1072 | if (!drv->bdrv_needs_filename) { | |
1073 | qdict_del(*options, "filename"); | |
1074 | } else { | |
1075 | filename = qdict_get_str(*options, "filename"); | |
1076 | } | |
6963a30d KW |
1077 | } |
1078 | ||
505d7583 | 1079 | if (!drv->bdrv_file_open) { |
5acd9d81 HR |
1080 | ret = bdrv_open(&bs, filename, NULL, *options, flags, drv, &local_err); |
1081 | *options = NULL; | |
505d7583 | 1082 | } else { |
5acd9d81 | 1083 | ret = bdrv_open_common(bs, NULL, *options, flags, drv, &local_err); |
505d7583 | 1084 | } |
83f64091 | 1085 | if (ret < 0) { |
34b5d2c6 | 1086 | error_propagate(errp, local_err); |
707ff828 KW |
1087 | goto fail; |
1088 | } | |
1089 | ||
71d0770c | 1090 | bs->growable = 1; |
83f64091 | 1091 | return 0; |
707ff828 KW |
1092 | |
1093 | fail: | |
707ff828 | 1094 | return ret; |
83f64091 FB |
1095 | } |
1096 | ||
8d24cce1 FZ |
1097 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
1098 | { | |
1099 | ||
826b6ca0 FZ |
1100 | if (bs->backing_hd) { |
1101 | assert(bs->backing_blocker); | |
1102 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); | |
1103 | } else if (backing_hd) { | |
1104 | error_setg(&bs->backing_blocker, | |
1105 | "device is used as backing hd of '%s'", | |
1106 | bs->device_name); | |
1107 | } | |
1108 | ||
8d24cce1 FZ |
1109 | bs->backing_hd = backing_hd; |
1110 | if (!backing_hd) { | |
826b6ca0 FZ |
1111 | error_free(bs->backing_blocker); |
1112 | bs->backing_blocker = NULL; | |
8d24cce1 FZ |
1113 | goto out; |
1114 | } | |
1115 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
1116 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); | |
1117 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), | |
1118 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
826b6ca0 FZ |
1119 | |
1120 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); | |
1121 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ | |
1122 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, | |
1123 | bs->backing_blocker); | |
8d24cce1 FZ |
1124 | out: |
1125 | bdrv_refresh_limits(bs); | |
1126 | } | |
1127 | ||
31ca6d07 KW |
1128 | /* |
1129 | * Opens the backing file for a BlockDriverState if not yet open | |
1130 | * | |
1131 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1132 | * empty set of options. The reference to the QDict is transferred to this | |
1133 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1134 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1135 | */ | |
34b5d2c6 | 1136 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 | 1137 | { |
1ba4b6a5 | 1138 | char *backing_filename = g_malloc0(PATH_MAX); |
317fc44e | 1139 | int ret = 0; |
9156df12 | 1140 | BlockDriver *back_drv = NULL; |
8d24cce1 | 1141 | BlockDriverState *backing_hd; |
34b5d2c6 | 1142 | Error *local_err = NULL; |
9156df12 PB |
1143 | |
1144 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1145 | QDECREF(options); |
1ba4b6a5 | 1146 | goto free_exit; |
9156df12 PB |
1147 | } |
1148 | ||
31ca6d07 KW |
1149 | /* NULL means an empty set of options */ |
1150 | if (options == NULL) { | |
1151 | options = qdict_new(); | |
1152 | } | |
1153 | ||
9156df12 | 1154 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1155 | if (qdict_haskey(options, "file.filename")) { |
1156 | backing_filename[0] = '\0'; | |
1157 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1158 | QDECREF(options); |
1ba4b6a5 | 1159 | goto free_exit; |
dbecebdd | 1160 | } else { |
1ba4b6a5 | 1161 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX); |
9156df12 PB |
1162 | } |
1163 | ||
8d24cce1 FZ |
1164 | backing_hd = bdrv_new("", errp); |
1165 | ||
9156df12 PB |
1166 | if (bs->backing_format[0] != '\0') { |
1167 | back_drv = bdrv_find_format(bs->backing_format); | |
1168 | } | |
1169 | ||
f67503e5 | 1170 | assert(bs->backing_hd == NULL); |
8d24cce1 | 1171 | ret = bdrv_open(&backing_hd, |
ddf5636d | 1172 | *backing_filename ? backing_filename : NULL, NULL, options, |
317fc44e | 1173 | bdrv_backing_flags(bs->open_flags), back_drv, &local_err); |
9156df12 | 1174 | if (ret < 0) { |
8d24cce1 FZ |
1175 | bdrv_unref(backing_hd); |
1176 | backing_hd = NULL; | |
9156df12 | 1177 | bs->open_flags |= BDRV_O_NO_BACKING; |
b04b6b6e FZ |
1178 | error_setg(errp, "Could not open backing file: %s", |
1179 | error_get_pretty(local_err)); | |
1180 | error_free(local_err); | |
1ba4b6a5 | 1181 | goto free_exit; |
9156df12 | 1182 | } |
8d24cce1 | 1183 | bdrv_set_backing_hd(bs, backing_hd); |
d80ac658 | 1184 | |
1ba4b6a5 BC |
1185 | free_exit: |
1186 | g_free(backing_filename); | |
1187 | return ret; | |
9156df12 PB |
1188 | } |
1189 | ||
da557aac HR |
1190 | /* |
1191 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1192 | * device's options. | |
1193 | * | |
da557aac HR |
1194 | * If allow_none is true, no image will be opened if filename is false and no |
1195 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1196 | * | |
1197 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1198 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1199 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1200 | * BlockdevRef. | |
1201 | * | |
1202 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1203 | * |
1204 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1205 | */ |
1206 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1207 | QDict *options, const char *bdref_key, int flags, | |
f7d9fd8c | 1208 | bool allow_none, Error **errp) |
da557aac HR |
1209 | { |
1210 | QDict *image_options; | |
1211 | int ret; | |
1212 | char *bdref_key_dot; | |
1213 | const char *reference; | |
1214 | ||
f67503e5 HR |
1215 | assert(pbs); |
1216 | assert(*pbs == NULL); | |
1217 | ||
da557aac HR |
1218 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1219 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1220 | g_free(bdref_key_dot); | |
1221 | ||
1222 | reference = qdict_get_try_str(options, bdref_key); | |
1223 | if (!filename && !reference && !qdict_size(image_options)) { | |
1224 | if (allow_none) { | |
1225 | ret = 0; | |
1226 | } else { | |
1227 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1228 | bdref_key); | |
1229 | ret = -EINVAL; | |
1230 | } | |
b20e61e0 | 1231 | QDECREF(image_options); |
da557aac HR |
1232 | goto done; |
1233 | } | |
1234 | ||
f7d9fd8c | 1235 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
da557aac HR |
1236 | |
1237 | done: | |
1238 | qdict_del(options, bdref_key); | |
1239 | return ret; | |
1240 | } | |
1241 | ||
b1e6fc08 | 1242 | void bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
b998875d KW |
1243 | { |
1244 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 1245 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d KW |
1246 | int64_t total_size; |
1247 | BlockDriver *bdrv_qcow2; | |
1248 | QEMUOptionParameter *create_options; | |
1249 | QDict *snapshot_options; | |
1250 | BlockDriverState *bs_snapshot; | |
1251 | Error *local_err; | |
1252 | int ret; | |
1253 | ||
1254 | /* if snapshot, we create a temporary backing file and open it | |
1255 | instead of opening 'filename' directly */ | |
1256 | ||
1257 | /* Get the required size from the image */ | |
f187743a KW |
1258 | total_size = bdrv_getlength(bs); |
1259 | if (total_size < 0) { | |
1260 | error_setg_errno(errp, -total_size, "Could not get image size"); | |
1ba4b6a5 | 1261 | goto out; |
f187743a KW |
1262 | } |
1263 | total_size &= BDRV_SECTOR_MASK; | |
b998875d KW |
1264 | |
1265 | /* Create the temporary image */ | |
1ba4b6a5 | 1266 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
1267 | if (ret < 0) { |
1268 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 1269 | goto out; |
b998875d KW |
1270 | } |
1271 | ||
1272 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
1273 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, | |
1274 | NULL); | |
1275 | ||
1276 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); | |
1277 | ||
1278 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err); | |
1279 | free_option_parameters(create_options); | |
1280 | if (ret < 0) { | |
1281 | error_setg_errno(errp, -ret, "Could not create temporary overlay " | |
1282 | "'%s': %s", tmp_filename, | |
1283 | error_get_pretty(local_err)); | |
1284 | error_free(local_err); | |
1ba4b6a5 | 1285 | goto out; |
b998875d KW |
1286 | } |
1287 | ||
1288 | /* Prepare a new options QDict for the temporary file */ | |
1289 | snapshot_options = qdict_new(); | |
1290 | qdict_put(snapshot_options, "file.driver", | |
1291 | qstring_from_str("file")); | |
1292 | qdict_put(snapshot_options, "file.filename", | |
1293 | qstring_from_str(tmp_filename)); | |
1294 | ||
98522f63 | 1295 | bs_snapshot = bdrv_new("", &error_abort); |
b998875d KW |
1296 | |
1297 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, | |
b1e6fc08 | 1298 | flags, bdrv_qcow2, &local_err); |
b998875d KW |
1299 | if (ret < 0) { |
1300 | error_propagate(errp, local_err); | |
1ba4b6a5 | 1301 | goto out; |
b998875d KW |
1302 | } |
1303 | ||
1304 | bdrv_append(bs_snapshot, bs); | |
1ba4b6a5 BC |
1305 | |
1306 | out: | |
1307 | g_free(tmp_filename); | |
b998875d KW |
1308 | } |
1309 | ||
4993f7ea HR |
1310 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1311 | { | |
1312 | QObject *options_obj; | |
1313 | QDict *options; | |
1314 | int ret; | |
1315 | ||
1316 | ret = strstart(filename, "json:", &filename); | |
1317 | assert(ret); | |
1318 | ||
1319 | options_obj = qobject_from_json(filename); | |
1320 | if (!options_obj) { | |
1321 | error_setg(errp, "Could not parse the JSON options"); | |
1322 | return NULL; | |
1323 | } | |
1324 | ||
1325 | if (qobject_type(options_obj) != QTYPE_QDICT) { | |
1326 | qobject_decref(options_obj); | |
1327 | error_setg(errp, "Invalid JSON object given"); | |
1328 | return NULL; | |
1329 | } | |
1330 | ||
1331 | options = qobject_to_qdict(options_obj); | |
1332 | qdict_flatten(options); | |
1333 | ||
1334 | return options; | |
1335 | } | |
1336 | ||
b6ce07aa KW |
1337 | /* |
1338 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1339 | * |
1340 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1341 | * empty set of options. The reference to the QDict belongs to the block layer | |
1342 | * after the call (even on failure), so if the caller intends to reuse the | |
1343 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1344 | * |
1345 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1346 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1347 | * |
1348 | * The reference parameter may be used to specify an existing block device which | |
1349 | * should be opened. If specified, neither options nor a filename may be given, | |
1350 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1351 | */ |
ddf5636d HR |
1352 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1353 | const char *reference, QDict *options, int flags, | |
1354 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1355 | { |
b6ce07aa | 1356 | int ret; |
f67503e5 | 1357 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1358 | const char *drvname; |
34b5d2c6 | 1359 | Error *local_err = NULL; |
b1e6fc08 | 1360 | int snapshot_flags = 0; |
712e7874 | 1361 | |
f67503e5 HR |
1362 | assert(pbs); |
1363 | ||
ddf5636d HR |
1364 | if (reference) { |
1365 | bool options_non_empty = options ? qdict_size(options) : false; | |
1366 | QDECREF(options); | |
1367 | ||
1368 | if (*pbs) { | |
1369 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1370 | "another block device"); | |
1371 | return -EINVAL; | |
1372 | } | |
1373 | ||
1374 | if (filename || options_non_empty) { | |
1375 | error_setg(errp, "Cannot reference an existing block device with " | |
1376 | "additional options or a new filename"); | |
1377 | return -EINVAL; | |
1378 | } | |
1379 | ||
1380 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1381 | if (!bs) { | |
1382 | return -ENODEV; | |
1383 | } | |
1384 | bdrv_ref(bs); | |
1385 | *pbs = bs; | |
1386 | return 0; | |
1387 | } | |
1388 | ||
f67503e5 HR |
1389 | if (*pbs) { |
1390 | bs = *pbs; | |
1391 | } else { | |
98522f63 | 1392 | bs = bdrv_new("", &error_abort); |
f67503e5 HR |
1393 | } |
1394 | ||
de9c0cec KW |
1395 | /* NULL means an empty set of options */ |
1396 | if (options == NULL) { | |
1397 | options = qdict_new(); | |
1398 | } | |
1399 | ||
4993f7ea HR |
1400 | if (filename && g_str_has_prefix(filename, "json:")) { |
1401 | QDict *json_options = parse_json_filename(filename, &local_err); | |
1402 | if (local_err) { | |
1403 | ret = -EINVAL; | |
1404 | goto fail; | |
1405 | } | |
1406 | ||
1407 | /* Options given in the filename have lower priority than options | |
1408 | * specified directly */ | |
1409 | qdict_join(options, json_options, false); | |
1410 | QDECREF(json_options); | |
1411 | filename = NULL; | |
1412 | } | |
1413 | ||
de9c0cec | 1414 | bs->options = options; |
b6ad491a | 1415 | options = qdict_clone_shallow(options); |
de9c0cec | 1416 | |
5469a2a6 HR |
1417 | if (flags & BDRV_O_PROTOCOL) { |
1418 | assert(!drv); | |
5acd9d81 | 1419 | ret = bdrv_file_open(bs, filename, &options, flags & ~BDRV_O_PROTOCOL, |
5469a2a6 | 1420 | &local_err); |
5469a2a6 | 1421 | if (!ret) { |
eb909c7f | 1422 | drv = bs->drv; |
5acd9d81 | 1423 | goto done; |
5469a2a6 HR |
1424 | } else if (bs->drv) { |
1425 | goto close_and_fail; | |
1426 | } else { | |
1427 | goto fail; | |
1428 | } | |
1429 | } | |
1430 | ||
f500a6d3 KW |
1431 | /* Open image file without format layer */ |
1432 | if (flags & BDRV_O_RDWR) { | |
1433 | flags |= BDRV_O_ALLOW_RDWR; | |
1434 | } | |
b1e6fc08 KW |
1435 | if (flags & BDRV_O_SNAPSHOT) { |
1436 | snapshot_flags = bdrv_temp_snapshot_flags(flags); | |
1437 | flags = bdrv_backing_flags(flags); | |
1438 | } | |
f500a6d3 | 1439 | |
f67503e5 | 1440 | assert(file == NULL); |
054963f8 | 1441 | ret = bdrv_open_image(&file, filename, options, "file", |
0b50cc88 KW |
1442 | bdrv_inherited_flags(flags), |
1443 | true, &local_err); | |
054963f8 | 1444 | if (ret < 0) { |
8bfea15d | 1445 | goto fail; |
f500a6d3 KW |
1446 | } |
1447 | ||
b6ce07aa | 1448 | /* Find the right image format driver */ |
74fe54f2 KW |
1449 | drvname = qdict_get_try_str(options, "driver"); |
1450 | if (drvname) { | |
8f94a6e4 | 1451 | drv = bdrv_find_format(drvname); |
74fe54f2 | 1452 | qdict_del(options, "driver"); |
06d22aa3 KW |
1453 | if (!drv) { |
1454 | error_setg(errp, "Invalid driver: '%s'", drvname); | |
1455 | ret = -EINVAL; | |
8bfea15d | 1456 | goto fail; |
06d22aa3 | 1457 | } |
74fe54f2 KW |
1458 | } |
1459 | ||
6db95603 | 1460 | if (!drv) { |
2a05cbe4 HR |
1461 | if (file) { |
1462 | ret = find_image_format(file, filename, &drv, &local_err); | |
1463 | } else { | |
1464 | error_setg(errp, "Must specify either driver or file"); | |
1465 | ret = -EINVAL; | |
8bfea15d | 1466 | goto fail; |
2a05cbe4 | 1467 | } |
51d7c00c | 1468 | } |
6987307c | 1469 | |
51d7c00c | 1470 | if (!drv) { |
8bfea15d | 1471 | goto fail; |
ea2384d3 | 1472 | } |
b6ce07aa KW |
1473 | |
1474 | /* Open the image */ | |
34b5d2c6 | 1475 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1476 | if (ret < 0) { |
8bfea15d | 1477 | goto fail; |
6987307c CH |
1478 | } |
1479 | ||
2a05cbe4 | 1480 | if (file && (bs->file != file)) { |
4f6fd349 | 1481 | bdrv_unref(file); |
f500a6d3 KW |
1482 | file = NULL; |
1483 | } | |
1484 | ||
b6ce07aa | 1485 | /* If there is a backing file, use it */ |
9156df12 | 1486 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1487 | QDict *backing_options; |
1488 | ||
5726d872 | 1489 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1490 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1491 | if (ret < 0) { |
b6ad491a | 1492 | goto close_and_fail; |
b6ce07aa | 1493 | } |
b6ce07aa KW |
1494 | } |
1495 | ||
b998875d KW |
1496 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
1497 | * temporary snapshot afterwards. */ | |
b1e6fc08 KW |
1498 | if (snapshot_flags) { |
1499 | bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); | |
b998875d KW |
1500 | if (local_err) { |
1501 | error_propagate(errp, local_err); | |
1502 | goto close_and_fail; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | ||
5acd9d81 | 1507 | done: |
b6ad491a | 1508 | /* Check if any unknown options were used */ |
5acd9d81 | 1509 | if (options && (qdict_size(options) != 0)) { |
b6ad491a | 1510 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
1511 | if (flags & BDRV_O_PROTOCOL) { |
1512 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
1513 | "'%s'", drv->format_name, entry->key); | |
1514 | } else { | |
1515 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " | |
1516 | "support the option '%s'", drv->format_name, | |
1517 | bs->device_name, entry->key); | |
1518 | } | |
b6ad491a KW |
1519 | |
1520 | ret = -EINVAL; | |
1521 | goto close_and_fail; | |
1522 | } | |
b6ad491a | 1523 | |
b6ce07aa | 1524 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1525 | bdrv_dev_change_media_cb(bs, true); |
c3adb58f MA |
1526 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
1527 | && !runstate_check(RUN_STATE_INMIGRATE) | |
1528 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ | |
1529 | error_setg(errp, | |
1530 | "Guest must be stopped for opening of encrypted image"); | |
1531 | ret = -EBUSY; | |
1532 | goto close_and_fail; | |
b6ce07aa KW |
1533 | } |
1534 | ||
c3adb58f | 1535 | QDECREF(options); |
f67503e5 | 1536 | *pbs = bs; |
b6ce07aa KW |
1537 | return 0; |
1538 | ||
8bfea15d | 1539 | fail: |
f500a6d3 | 1540 | if (file != NULL) { |
4f6fd349 | 1541 | bdrv_unref(file); |
f500a6d3 | 1542 | } |
de9c0cec | 1543 | QDECREF(bs->options); |
b6ad491a | 1544 | QDECREF(options); |
de9c0cec | 1545 | bs->options = NULL; |
f67503e5 HR |
1546 | if (!*pbs) { |
1547 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1548 | needs to be freed now. Otherwise, it does not need to be closed, | |
1549 | since it has not really been opened yet. */ | |
1550 | bdrv_unref(bs); | |
1551 | } | |
84d18f06 | 1552 | if (local_err) { |
34b5d2c6 HR |
1553 | error_propagate(errp, local_err); |
1554 | } | |
b6ad491a | 1555 | return ret; |
de9c0cec | 1556 | |
b6ad491a | 1557 | close_and_fail: |
f67503e5 HR |
1558 | /* See fail path, but now the BDS has to be always closed */ |
1559 | if (*pbs) { | |
1560 | bdrv_close(bs); | |
1561 | } else { | |
1562 | bdrv_unref(bs); | |
1563 | } | |
b6ad491a | 1564 | QDECREF(options); |
84d18f06 | 1565 | if (local_err) { |
34b5d2c6 HR |
1566 | error_propagate(errp, local_err); |
1567 | } | |
b6ce07aa KW |
1568 | return ret; |
1569 | } | |
1570 | ||
e971aa12 JC |
1571 | typedef struct BlockReopenQueueEntry { |
1572 | bool prepared; | |
1573 | BDRVReopenState state; | |
1574 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1575 | } BlockReopenQueueEntry; | |
1576 | ||
1577 | /* | |
1578 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1579 | * reopen of multiple devices. | |
1580 | * | |
1581 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1582 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1583 | * be created and initialized. This newly created BlockReopenQueue should be | |
1584 | * passed back in for subsequent calls that are intended to be of the same | |
1585 | * atomic 'set'. | |
1586 | * | |
1587 | * bs is the BlockDriverState to add to the reopen queue. | |
1588 | * | |
1589 | * flags contains the open flags for the associated bs | |
1590 | * | |
1591 | * returns a pointer to bs_queue, which is either the newly allocated | |
1592 | * bs_queue, or the existing bs_queue being used. | |
1593 | * | |
1594 | */ | |
1595 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1596 | BlockDriverState *bs, int flags) | |
1597 | { | |
1598 | assert(bs != NULL); | |
1599 | ||
1600 | BlockReopenQueueEntry *bs_entry; | |
1601 | if (bs_queue == NULL) { | |
1602 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1603 | QSIMPLEQ_INIT(bs_queue); | |
1604 | } | |
1605 | ||
f1f25a2e KW |
1606 | /* bdrv_open() masks this flag out */ |
1607 | flags &= ~BDRV_O_PROTOCOL; | |
1608 | ||
e971aa12 | 1609 | if (bs->file) { |
f1f25a2e | 1610 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
e971aa12 JC |
1611 | } |
1612 | ||
1613 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1614 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1615 | ||
1616 | bs_entry->state.bs = bs; | |
1617 | bs_entry->state.flags = flags; | |
1618 | ||
1619 | return bs_queue; | |
1620 | } | |
1621 | ||
1622 | /* | |
1623 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1624 | * | |
1625 | * The queue passed in (bs_queue) must have been built up previous | |
1626 | * via bdrv_reopen_queue(). | |
1627 | * | |
1628 | * Reopens all BDS specified in the queue, with the appropriate | |
1629 | * flags. All devices are prepared for reopen, and failure of any | |
1630 | * device will cause all device changes to be abandonded, and intermediate | |
1631 | * data cleaned up. | |
1632 | * | |
1633 | * If all devices prepare successfully, then the changes are committed | |
1634 | * to all devices. | |
1635 | * | |
1636 | */ | |
1637 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1638 | { | |
1639 | int ret = -1; | |
1640 | BlockReopenQueueEntry *bs_entry, *next; | |
1641 | Error *local_err = NULL; | |
1642 | ||
1643 | assert(bs_queue != NULL); | |
1644 | ||
1645 | bdrv_drain_all(); | |
1646 | ||
1647 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1648 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1649 | error_propagate(errp, local_err); | |
1650 | goto cleanup; | |
1651 | } | |
1652 | bs_entry->prepared = true; | |
1653 | } | |
1654 | ||
1655 | /* If we reach this point, we have success and just need to apply the | |
1656 | * changes | |
1657 | */ | |
1658 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1659 | bdrv_reopen_commit(&bs_entry->state); | |
1660 | } | |
1661 | ||
1662 | ret = 0; | |
1663 | ||
1664 | cleanup: | |
1665 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1666 | if (ret && bs_entry->prepared) { | |
1667 | bdrv_reopen_abort(&bs_entry->state); | |
1668 | } | |
1669 | g_free(bs_entry); | |
1670 | } | |
1671 | g_free(bs_queue); | |
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | ||
1676 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1677 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1678 | { | |
1679 | int ret = -1; | |
1680 | Error *local_err = NULL; | |
1681 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1682 | ||
1683 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1684 | if (local_err != NULL) { | |
1685 | error_propagate(errp, local_err); | |
1686 | } | |
1687 | return ret; | |
1688 | } | |
1689 | ||
1690 | ||
1691 | /* | |
1692 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1693 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1694 | * the block driver layer .bdrv_reopen_prepare() | |
1695 | * | |
1696 | * bs is the BlockDriverState to reopen | |
1697 | * flags are the new open flags | |
1698 | * queue is the reopen queue | |
1699 | * | |
1700 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1701 | * as well. | |
1702 | * | |
1703 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1704 | * It is the responsibility of the caller to then call the abort() or | |
1705 | * commit() for any other BDS that have been left in a prepare() state | |
1706 | * | |
1707 | */ | |
1708 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1709 | Error **errp) | |
1710 | { | |
1711 | int ret = -1; | |
1712 | Error *local_err = NULL; | |
1713 | BlockDriver *drv; | |
1714 | ||
1715 | assert(reopen_state != NULL); | |
1716 | assert(reopen_state->bs->drv != NULL); | |
1717 | drv = reopen_state->bs->drv; | |
1718 | ||
1719 | /* if we are to stay read-only, do not allow permission change | |
1720 | * to r/w */ | |
1721 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1722 | reopen_state->flags & BDRV_O_RDWR) { | |
1723 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1724 | reopen_state->bs->device_name); | |
1725 | goto error; | |
1726 | } | |
1727 | ||
1728 | ||
1729 | ret = bdrv_flush(reopen_state->bs); | |
1730 | if (ret) { | |
1731 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1732 | strerror(-ret)); | |
1733 | goto error; | |
1734 | } | |
1735 | ||
1736 | if (drv->bdrv_reopen_prepare) { | |
1737 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1738 | if (ret) { | |
1739 | if (local_err != NULL) { | |
1740 | error_propagate(errp, local_err); | |
1741 | } else { | |
d8b6895f LC |
1742 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1743 | reopen_state->bs->filename); | |
e971aa12 JC |
1744 | } |
1745 | goto error; | |
1746 | } | |
1747 | } else { | |
1748 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1749 | * handler for each supported drv. */ | |
1750 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1751 | drv->format_name, reopen_state->bs->device_name, | |
1752 | "reopening of file"); | |
1753 | ret = -1; | |
1754 | goto error; | |
1755 | } | |
1756 | ||
1757 | ret = 0; | |
1758 | ||
1759 | error: | |
1760 | return ret; | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1765 | * makes them final by swapping the staging BlockDriverState contents into | |
1766 | * the active BlockDriverState contents. | |
1767 | */ | |
1768 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1769 | { | |
1770 | BlockDriver *drv; | |
1771 | ||
1772 | assert(reopen_state != NULL); | |
1773 | drv = reopen_state->bs->drv; | |
1774 | assert(drv != NULL); | |
1775 | ||
1776 | /* If there are any driver level actions to take */ | |
1777 | if (drv->bdrv_reopen_commit) { | |
1778 | drv->bdrv_reopen_commit(reopen_state); | |
1779 | } | |
1780 | ||
1781 | /* set BDS specific flags now */ | |
1782 | reopen_state->bs->open_flags = reopen_state->flags; | |
1783 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1784 | BDRV_O_CACHE_WB); | |
1785 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac KW |
1786 | |
1787 | bdrv_refresh_limits(reopen_state->bs); | |
e971aa12 JC |
1788 | } |
1789 | ||
1790 | /* | |
1791 | * Abort the reopen, and delete and free the staged changes in | |
1792 | * reopen_state | |
1793 | */ | |
1794 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1795 | { | |
1796 | BlockDriver *drv; | |
1797 | ||
1798 | assert(reopen_state != NULL); | |
1799 | drv = reopen_state->bs->drv; | |
1800 | assert(drv != NULL); | |
1801 | ||
1802 | if (drv->bdrv_reopen_abort) { | |
1803 | drv->bdrv_reopen_abort(reopen_state); | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | ||
fc01f7e7 FB |
1808 | void bdrv_close(BlockDriverState *bs) |
1809 | { | |
3cbc002c PB |
1810 | if (bs->job) { |
1811 | block_job_cancel_sync(bs->job); | |
1812 | } | |
58fda173 SH |
1813 | bdrv_drain_all(); /* complete I/O */ |
1814 | bdrv_flush(bs); | |
1815 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1816 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1817 | |
3cbc002c | 1818 | if (bs->drv) { |
557df6ac | 1819 | if (bs->backing_hd) { |
826b6ca0 FZ |
1820 | BlockDriverState *backing_hd = bs->backing_hd; |
1821 | bdrv_set_backing_hd(bs, NULL); | |
1822 | bdrv_unref(backing_hd); | |
557df6ac | 1823 | } |
ea2384d3 | 1824 | bs->drv->bdrv_close(bs); |
7267c094 | 1825 | g_free(bs->opaque); |
ea2384d3 FB |
1826 | bs->opaque = NULL; |
1827 | bs->drv = NULL; | |
53fec9d3 | 1828 | bs->copy_on_read = 0; |
a275fa42 PB |
1829 | bs->backing_file[0] = '\0'; |
1830 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1831 | bs->total_sectors = 0; |
1832 | bs->encrypted = 0; | |
1833 | bs->valid_key = 0; | |
1834 | bs->sg = 0; | |
1835 | bs->growable = 0; | |
0d51b4de | 1836 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1837 | QDECREF(bs->options); |
1838 | bs->options = NULL; | |
b338082b | 1839 | |
66f82cee | 1840 | if (bs->file != NULL) { |
4f6fd349 | 1841 | bdrv_unref(bs->file); |
0ac9377d | 1842 | bs->file = NULL; |
66f82cee | 1843 | } |
b338082b | 1844 | } |
98f90dba | 1845 | |
9ca11154 PH |
1846 | bdrv_dev_change_media_cb(bs, false); |
1847 | ||
98f90dba ZYW |
1848 | /*throttling disk I/O limits*/ |
1849 | if (bs->io_limits_enabled) { | |
1850 | bdrv_io_limits_disable(bs); | |
1851 | } | |
b338082b FB |
1852 | } |
1853 | ||
2bc93fed MK |
1854 | void bdrv_close_all(void) |
1855 | { | |
1856 | BlockDriverState *bs; | |
1857 | ||
dc364f4c | 1858 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
2bc93fed MK |
1859 | bdrv_close(bs); |
1860 | } | |
1861 | } | |
1862 | ||
88266f5a SH |
1863 | /* Check if any requests are in-flight (including throttled requests) */ |
1864 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1865 | { | |
1866 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1867 | return true; | |
1868 | } | |
cc0681c4 BC |
1869 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1870 | return true; | |
1871 | } | |
1872 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1873 | return true; |
1874 | } | |
1875 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1876 | return true; | |
1877 | } | |
1878 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1879 | return true; | |
1880 | } | |
1881 | return false; | |
1882 | } | |
1883 | ||
1884 | static bool bdrv_requests_pending_all(void) | |
1885 | { | |
1886 | BlockDriverState *bs; | |
dc364f4c | 1887 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
88266f5a SH |
1888 | if (bdrv_requests_pending(bs)) { |
1889 | return true; | |
1890 | } | |
1891 | } | |
1892 | return false; | |
1893 | } | |
1894 | ||
922453bc SH |
1895 | /* |
1896 | * Wait for pending requests to complete across all BlockDriverStates | |
1897 | * | |
1898 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1899 | * after calling this function. | |
4c355d53 ZYW |
1900 | * |
1901 | * Note that completion of an asynchronous I/O operation can trigger any | |
1902 | * number of other I/O operations on other devices---for example a coroutine | |
1903 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1904 | * coroutine is complete. Because of this, it is not possible to have a | |
1905 | * function to drain a single device's I/O queue. | |
922453bc SH |
1906 | */ |
1907 | void bdrv_drain_all(void) | |
1908 | { | |
88266f5a SH |
1909 | /* Always run first iteration so any pending completion BHs run */ |
1910 | bool busy = true; | |
922453bc SH |
1911 | BlockDriverState *bs; |
1912 | ||
88266f5a | 1913 | while (busy) { |
dc364f4c | 1914 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
0b06ef3b | 1915 | bdrv_start_throttled_reqs(bs); |
4c355d53 | 1916 | } |
922453bc | 1917 | |
88266f5a SH |
1918 | busy = bdrv_requests_pending_all(); |
1919 | busy |= aio_poll(qemu_get_aio_context(), busy); | |
922453bc SH |
1920 | } |
1921 | } | |
1922 | ||
dc364f4c BC |
1923 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
1924 | * graph_bdrv_state list. | |
d22b2f41 RH |
1925 | Also, NULL terminate the device_name to prevent double remove */ |
1926 | void bdrv_make_anon(BlockDriverState *bs) | |
1927 | { | |
1928 | if (bs->device_name[0] != '\0') { | |
dc364f4c | 1929 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
d22b2f41 RH |
1930 | } |
1931 | bs->device_name[0] = '\0'; | |
dc364f4c BC |
1932 | if (bs->node_name[0] != '\0') { |
1933 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
1934 | } | |
1935 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
1936 | } |
1937 | ||
e023b2e2 PB |
1938 | static void bdrv_rebind(BlockDriverState *bs) |
1939 | { | |
1940 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1941 | bs->drv->bdrv_rebind(bs); | |
1942 | } | |
1943 | } | |
1944 | ||
4ddc07ca PB |
1945 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1946 | BlockDriverState *bs_src) | |
8802d1fd | 1947 | { |
4ddc07ca | 1948 | /* move some fields that need to stay attached to the device */ |
8802d1fd JC |
1949 | |
1950 | /* dev info */ | |
4ddc07ca PB |
1951 | bs_dest->dev_ops = bs_src->dev_ops; |
1952 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1953 | bs_dest->dev = bs_src->dev; | |
1b7fd729 | 1954 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 1955 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 1956 | |
4ddc07ca | 1957 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1958 | |
cc0681c4 BC |
1959 | /* i/o throttled req */ |
1960 | memcpy(&bs_dest->throttle_state, | |
1961 | &bs_src->throttle_state, | |
1962 | sizeof(ThrottleState)); | |
1963 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
1964 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 1965 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 1966 | |
8802d1fd | 1967 | /* r/w error */ |
4ddc07ca PB |
1968 | bs_dest->on_read_error = bs_src->on_read_error; |
1969 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1970 | |
1971 | /* i/o status */ | |
4ddc07ca PB |
1972 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1973 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1974 | |
a9fc4408 | 1975 | /* dirty bitmap */ |
e4654d2d | 1976 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 1977 | |
9fcb0251 FZ |
1978 | /* reference count */ |
1979 | bs_dest->refcnt = bs_src->refcnt; | |
1980 | ||
a9fc4408 | 1981 | /* job */ |
4ddc07ca | 1982 | bs_dest->job = bs_src->job; |
a9fc4408 | 1983 | |
8802d1fd | 1984 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1985 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1986 | bs_src->device_name); | |
dc364f4c | 1987 | bs_dest->device_list = bs_src->device_list; |
fbe40ff7 FZ |
1988 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
1989 | sizeof(bs_dest->op_blockers)); | |
4ddc07ca | 1990 | } |
8802d1fd | 1991 | |
4ddc07ca PB |
1992 | /* |
1993 | * Swap bs contents for two image chains while they are live, | |
1994 | * while keeping required fields on the BlockDriverState that is | |
1995 | * actually attached to a device. | |
1996 | * | |
1997 | * This will modify the BlockDriverState fields, and swap contents | |
1998 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1999 | * | |
2000 | * bs_new is required to be anonymous. | |
2001 | * | |
2002 | * This function does not create any image files. | |
2003 | */ | |
2004 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
2005 | { | |
2006 | BlockDriverState tmp; | |
f6801b83 | 2007 | |
90ce8a06 BC |
2008 | /* The code needs to swap the node_name but simply swapping node_list won't |
2009 | * work so first remove the nodes from the graph list, do the swap then | |
2010 | * insert them back if needed. | |
2011 | */ | |
2012 | if (bs_new->node_name[0] != '\0') { | |
2013 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); | |
2014 | } | |
2015 | if (bs_old->node_name[0] != '\0') { | |
2016 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); | |
2017 | } | |
2018 | ||
4ddc07ca PB |
2019 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
2020 | assert(bs_new->device_name[0] == '\0'); | |
e4654d2d | 2021 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
2022 | assert(bs_new->job == NULL); |
2023 | assert(bs_new->dev == NULL); | |
4ddc07ca | 2024 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2025 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 2026 | |
4ddc07ca PB |
2027 | tmp = *bs_new; |
2028 | *bs_new = *bs_old; | |
2029 | *bs_old = tmp; | |
a9fc4408 | 2030 | |
4ddc07ca PB |
2031 | /* there are some fields that should not be swapped, move them back */ |
2032 | bdrv_move_feature_fields(&tmp, bs_old); | |
2033 | bdrv_move_feature_fields(bs_old, bs_new); | |
2034 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 2035 | |
4ddc07ca PB |
2036 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
2037 | assert(bs_new->device_name[0] == '\0'); | |
2038 | ||
2039 | /* Check a few fields that should remain attached to the device */ | |
2040 | assert(bs_new->dev == NULL); | |
2041 | assert(bs_new->job == NULL); | |
4ddc07ca | 2042 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2043 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 | 2044 | |
90ce8a06 BC |
2045 | /* insert the nodes back into the graph node list if needed */ |
2046 | if (bs_new->node_name[0] != '\0') { | |
2047 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); | |
2048 | } | |
2049 | if (bs_old->node_name[0] != '\0') { | |
2050 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); | |
2051 | } | |
2052 | ||
e023b2e2 | 2053 | bdrv_rebind(bs_new); |
4ddc07ca PB |
2054 | bdrv_rebind(bs_old); |
2055 | } | |
2056 | ||
2057 | /* | |
2058 | * Add new bs contents at the top of an image chain while the chain is | |
2059 | * live, while keeping required fields on the top layer. | |
2060 | * | |
2061 | * This will modify the BlockDriverState fields, and swap contents | |
2062 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
2063 | * | |
2064 | * bs_new is required to be anonymous. | |
2065 | * | |
2066 | * This function does not create any image files. | |
2067 | */ | |
2068 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
2069 | { | |
2070 | bdrv_swap(bs_new, bs_top); | |
2071 | ||
2072 | /* The contents of 'tmp' will become bs_top, as we are | |
2073 | * swapping bs_new and bs_top contents. */ | |
8d24cce1 | 2074 | bdrv_set_backing_hd(bs_top, bs_new); |
8802d1fd JC |
2075 | } |
2076 | ||
4f6fd349 | 2077 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 2078 | { |
fa879d62 | 2079 | assert(!bs->dev); |
3e914655 | 2080 | assert(!bs->job); |
3718d8ab | 2081 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 2082 | assert(!bs->refcnt); |
e4654d2d | 2083 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 2084 | |
e1b5c52e SH |
2085 | bdrv_close(bs); |
2086 | ||
1b7bdbc1 | 2087 | /* remove from list, if necessary */ |
d22b2f41 | 2088 | bdrv_make_anon(bs); |
34c6f050 | 2089 | |
7267c094 | 2090 | g_free(bs); |
fc01f7e7 FB |
2091 | } |
2092 | ||
fa879d62 MA |
2093 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
2094 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 2095 | { |
fa879d62 | 2096 | if (bs->dev) { |
18846dee MA |
2097 | return -EBUSY; |
2098 | } | |
fa879d62 | 2099 | bs->dev = dev; |
28a7282a | 2100 | bdrv_iostatus_reset(bs); |
18846dee MA |
2101 | return 0; |
2102 | } | |
2103 | ||
fa879d62 MA |
2104 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
2105 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 2106 | { |
fa879d62 MA |
2107 | if (bdrv_attach_dev(bs, dev) < 0) { |
2108 | abort(); | |
2109 | } | |
2110 | } | |
2111 | ||
2112 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
2113 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
2114 | { | |
2115 | assert(bs->dev == dev); | |
2116 | bs->dev = NULL; | |
0e49de52 MA |
2117 | bs->dev_ops = NULL; |
2118 | bs->dev_opaque = NULL; | |
1b7fd729 | 2119 | bs->guest_block_size = 512; |
18846dee MA |
2120 | } |
2121 | ||
fa879d62 MA |
2122 | /* TODO change to return DeviceState * when all users are qdevified */ |
2123 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 2124 | { |
fa879d62 | 2125 | return bs->dev; |
18846dee MA |
2126 | } |
2127 | ||
0e49de52 MA |
2128 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
2129 | void *opaque) | |
2130 | { | |
2131 | bs->dev_ops = ops; | |
2132 | bs->dev_opaque = opaque; | |
2133 | } | |
2134 | ||
32c81a4a PB |
2135 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
2136 | enum MonitorEvent ev, | |
2137 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
2138 | { |
2139 | QObject *data; | |
2140 | const char *action_str; | |
2141 | ||
2142 | switch (action) { | |
2143 | case BDRV_ACTION_REPORT: | |
2144 | action_str = "report"; | |
2145 | break; | |
2146 | case BDRV_ACTION_IGNORE: | |
2147 | action_str = "ignore"; | |
2148 | break; | |
2149 | case BDRV_ACTION_STOP: | |
2150 | action_str = "stop"; | |
2151 | break; | |
2152 | default: | |
2153 | abort(); | |
2154 | } | |
2155 | ||
2156 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
2157 | bdrv->device_name, | |
2158 | action_str, | |
2159 | is_read ? "read" : "write"); | |
32c81a4a | 2160 | monitor_protocol_event(ev, data); |
329c0a48 LC |
2161 | |
2162 | qobject_decref(data); | |
2163 | } | |
2164 | ||
6f382ed2 LC |
2165 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
2166 | { | |
2167 | QObject *data; | |
2168 | ||
2169 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
2170 | bdrv_get_device_name(bs), ejected); | |
2171 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
2172 | ||
2173 | qobject_decref(data); | |
2174 | } | |
2175 | ||
7d4b4ba5 | 2176 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 2177 | { |
145feb17 | 2178 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 2179 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 2180 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
2181 | if (tray_was_closed) { |
2182 | /* tray open */ | |
2183 | bdrv_emit_qmp_eject_event(bs, true); | |
2184 | } | |
2185 | if (load) { | |
2186 | /* tray close */ | |
2187 | bdrv_emit_qmp_eject_event(bs, false); | |
2188 | } | |
145feb17 MA |
2189 | } |
2190 | } | |
2191 | ||
2c6942fa MA |
2192 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
2193 | { | |
2194 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
2195 | } | |
2196 | ||
025ccaa7 PB |
2197 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
2198 | { | |
2199 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
2200 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
2201 | } | |
2202 | } | |
2203 | ||
e4def80b MA |
2204 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
2205 | { | |
2206 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
2207 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
2208 | } | |
2209 | return false; | |
2210 | } | |
2211 | ||
145feb17 MA |
2212 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
2213 | { | |
2214 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
2215 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
2216 | } |
2217 | } | |
2218 | ||
f107639a MA |
2219 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
2220 | { | |
2221 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
2222 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
2223 | } | |
2224 | return false; | |
2225 | } | |
2226 | ||
e97fc193 AL |
2227 | /* |
2228 | * Run consistency checks on an image | |
2229 | * | |
e076f338 | 2230 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2231 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2232 | * check are stored in res. |
e97fc193 | 2233 | */ |
4534ff54 | 2234 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
2235 | { |
2236 | if (bs->drv->bdrv_check == NULL) { | |
2237 | return -ENOTSUP; | |
2238 | } | |
2239 | ||
e076f338 | 2240 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2241 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2242 | } |
2243 | ||
8a426614 KW |
2244 | #define COMMIT_BUF_SECTORS 2048 |
2245 | ||
33e3963e FB |
2246 | /* commit COW file into the raw image */ |
2247 | int bdrv_commit(BlockDriverState *bs) | |
2248 | { | |
19cb3738 | 2249 | BlockDriver *drv = bs->drv; |
72706ea4 | 2250 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2251 | int n, ro, open_flags; |
0bce597d | 2252 | int ret = 0; |
72706ea4 | 2253 | uint8_t *buf = NULL; |
c2cba3d9 | 2254 | char filename[PATH_MAX]; |
33e3963e | 2255 | |
19cb3738 FB |
2256 | if (!drv) |
2257 | return -ENOMEDIUM; | |
4dca4b63 NS |
2258 | |
2259 | if (!bs->backing_hd) { | |
2260 | return -ENOTSUP; | |
33e3963e FB |
2261 | } |
2262 | ||
3718d8ab FZ |
2263 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) || |
2264 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) { | |
2d3735d3 SH |
2265 | return -EBUSY; |
2266 | } | |
2267 | ||
4dca4b63 | 2268 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2269 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2270 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2271 | open_flags = bs->backing_hd->open_flags; |
2272 | ||
2273 | if (ro) { | |
0bce597d JC |
2274 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2275 | return -EACCES; | |
4dca4b63 | 2276 | } |
ea2384d3 | 2277 | } |
33e3963e | 2278 | |
72706ea4 JC |
2279 | length = bdrv_getlength(bs); |
2280 | if (length < 0) { | |
2281 | ret = length; | |
2282 | goto ro_cleanup; | |
2283 | } | |
2284 | ||
2285 | backing_length = bdrv_getlength(bs->backing_hd); | |
2286 | if (backing_length < 0) { | |
2287 | ret = backing_length; | |
2288 | goto ro_cleanup; | |
2289 | } | |
2290 | ||
2291 | /* If our top snapshot is larger than the backing file image, | |
2292 | * grow the backing file image if possible. If not possible, | |
2293 | * we must return an error */ | |
2294 | if (length > backing_length) { | |
2295 | ret = bdrv_truncate(bs->backing_hd, length); | |
2296 | if (ret < 0) { | |
2297 | goto ro_cleanup; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | total_sectors = length >> BDRV_SECTOR_BITS; | |
7267c094 | 2302 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
2303 | |
2304 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2305 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2306 | if (ret < 0) { | |
2307 | goto ro_cleanup; | |
2308 | } | |
2309 | if (ret) { | |
dabfa6cc KW |
2310 | ret = bdrv_read(bs, sector, buf, n); |
2311 | if (ret < 0) { | |
8a426614 KW |
2312 | goto ro_cleanup; |
2313 | } | |
2314 | ||
dabfa6cc KW |
2315 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2316 | if (ret < 0) { | |
8a426614 KW |
2317 | goto ro_cleanup; |
2318 | } | |
ea2384d3 | 2319 | } |
33e3963e | 2320 | } |
95389c86 | 2321 | |
1d44952f CH |
2322 | if (drv->bdrv_make_empty) { |
2323 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2324 | if (ret < 0) { |
2325 | goto ro_cleanup; | |
2326 | } | |
1d44952f CH |
2327 | bdrv_flush(bs); |
2328 | } | |
95389c86 | 2329 | |
3f5075ae CH |
2330 | /* |
2331 | * Make sure all data we wrote to the backing device is actually | |
2332 | * stable on disk. | |
2333 | */ | |
dabfa6cc | 2334 | if (bs->backing_hd) { |
3f5075ae | 2335 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2336 | } |
4dca4b63 | 2337 | |
dabfa6cc | 2338 | ret = 0; |
4dca4b63 | 2339 | ro_cleanup: |
7267c094 | 2340 | g_free(buf); |
4dca4b63 NS |
2341 | |
2342 | if (ro) { | |
0bce597d JC |
2343 | /* ignoring error return here */ |
2344 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2345 | } |
2346 | ||
1d44952f | 2347 | return ret; |
33e3963e FB |
2348 | } |
2349 | ||
e8877497 | 2350 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2351 | { |
2352 | BlockDriverState *bs; | |
2353 | ||
dc364f4c | 2354 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
272d2d8e JC |
2355 | if (bs->drv && bs->backing_hd) { |
2356 | int ret = bdrv_commit(bs); | |
2357 | if (ret < 0) { | |
2358 | return ret; | |
2359 | } | |
e8877497 | 2360 | } |
6ab4b5ab | 2361 | } |
e8877497 | 2362 | return 0; |
6ab4b5ab MA |
2363 | } |
2364 | ||
dbffbdcf SH |
2365 | /** |
2366 | * Remove an active request from the tracked requests list | |
2367 | * | |
2368 | * This function should be called when a tracked request is completing. | |
2369 | */ | |
2370 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2371 | { | |
2dbafdc0 KW |
2372 | if (req->serialising) { |
2373 | req->bs->serialising_in_flight--; | |
2374 | } | |
2375 | ||
dbffbdcf | 2376 | QLIST_REMOVE(req, list); |
f4658285 | 2377 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2378 | } |
2379 | ||
2380 | /** | |
2381 | * Add an active request to the tracked requests list | |
2382 | */ | |
2383 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2384 | BlockDriverState *bs, | |
793ed47a KW |
2385 | int64_t offset, |
2386 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2387 | { |
2388 | *req = (BdrvTrackedRequest){ | |
2389 | .bs = bs, | |
2dbafdc0 KW |
2390 | .offset = offset, |
2391 | .bytes = bytes, | |
2392 | .is_write = is_write, | |
2393 | .co = qemu_coroutine_self(), | |
2394 | .serialising = false, | |
7327145f KW |
2395 | .overlap_offset = offset, |
2396 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2397 | }; |
2398 | ||
f4658285 SH |
2399 | qemu_co_queue_init(&req->wait_queue); |
2400 | ||
dbffbdcf SH |
2401 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2402 | } | |
2403 | ||
e96126ff | 2404 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2405 | { |
7327145f | 2406 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2407 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2408 | - overlap_offset; | |
7327145f | 2409 | |
2dbafdc0 KW |
2410 | if (!req->serialising) { |
2411 | req->bs->serialising_in_flight++; | |
2412 | req->serialising = true; | |
2413 | } | |
7327145f KW |
2414 | |
2415 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2416 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2417 | } |
2418 | ||
d83947ac SH |
2419 | /** |
2420 | * Round a region to cluster boundaries | |
2421 | */ | |
343bded4 PB |
2422 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2423 | int64_t sector_num, int nb_sectors, | |
2424 | int64_t *cluster_sector_num, | |
2425 | int *cluster_nb_sectors) | |
d83947ac SH |
2426 | { |
2427 | BlockDriverInfo bdi; | |
2428 | ||
2429 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2430 | *cluster_sector_num = sector_num; | |
2431 | *cluster_nb_sectors = nb_sectors; | |
2432 | } else { | |
2433 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2434 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2435 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2436 | nb_sectors, c); | |
2437 | } | |
2438 | } | |
2439 | ||
7327145f | 2440 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2441 | { |
2442 | BlockDriverInfo bdi; | |
7327145f | 2443 | int ret; |
793ed47a | 2444 | |
7327145f KW |
2445 | ret = bdrv_get_info(bs, &bdi); |
2446 | if (ret < 0 || bdi.cluster_size == 0) { | |
2447 | return bs->request_alignment; | |
793ed47a | 2448 | } else { |
7327145f | 2449 | return bdi.cluster_size; |
793ed47a KW |
2450 | } |
2451 | } | |
2452 | ||
f4658285 | 2453 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2454 | int64_t offset, unsigned int bytes) |
2455 | { | |
d83947ac | 2456 | /* aaaa bbbb */ |
7327145f | 2457 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2458 | return false; |
2459 | } | |
2460 | /* bbbb aaaa */ | |
7327145f | 2461 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2462 | return false; |
2463 | } | |
2464 | return true; | |
f4658285 SH |
2465 | } |
2466 | ||
28de2dcd | 2467 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2468 | { |
2dbafdc0 | 2469 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2470 | BdrvTrackedRequest *req; |
2471 | bool retry; | |
28de2dcd | 2472 | bool waited = false; |
f4658285 | 2473 | |
2dbafdc0 | 2474 | if (!bs->serialising_in_flight) { |
28de2dcd | 2475 | return false; |
2dbafdc0 KW |
2476 | } |
2477 | ||
f4658285 SH |
2478 | do { |
2479 | retry = false; | |
2480 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2481 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2482 | continue; |
2483 | } | |
7327145f KW |
2484 | if (tracked_request_overlaps(req, self->overlap_offset, |
2485 | self->overlap_bytes)) | |
2486 | { | |
5f8b6491 SH |
2487 | /* Hitting this means there was a reentrant request, for |
2488 | * example, a block driver issuing nested requests. This must | |
2489 | * never happen since it means deadlock. | |
2490 | */ | |
2491 | assert(qemu_coroutine_self() != req->co); | |
2492 | ||
6460440f KW |
2493 | /* If the request is already (indirectly) waiting for us, or |
2494 | * will wait for us as soon as it wakes up, then just go on | |
2495 | * (instead of producing a deadlock in the former case). */ | |
2496 | if (!req->waiting_for) { | |
2497 | self->waiting_for = req; | |
2498 | qemu_co_queue_wait(&req->wait_queue); | |
2499 | self->waiting_for = NULL; | |
2500 | retry = true; | |
28de2dcd | 2501 | waited = true; |
6460440f KW |
2502 | break; |
2503 | } | |
f4658285 SH |
2504 | } |
2505 | } | |
2506 | } while (retry); | |
28de2dcd KW |
2507 | |
2508 | return waited; | |
f4658285 SH |
2509 | } |
2510 | ||
756e6736 KW |
2511 | /* |
2512 | * Return values: | |
2513 | * 0 - success | |
2514 | * -EINVAL - backing format specified, but no file | |
2515 | * -ENOSPC - can't update the backing file because no space is left in the | |
2516 | * image file header | |
2517 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2518 | */ | |
2519 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2520 | const char *backing_file, const char *backing_fmt) | |
2521 | { | |
2522 | BlockDriver *drv = bs->drv; | |
469ef350 | 2523 | int ret; |
756e6736 | 2524 | |
5f377794 PB |
2525 | /* Backing file format doesn't make sense without a backing file */ |
2526 | if (backing_fmt && !backing_file) { | |
2527 | return -EINVAL; | |
2528 | } | |
2529 | ||
756e6736 | 2530 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2531 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2532 | } else { |
469ef350 | 2533 | ret = -ENOTSUP; |
756e6736 | 2534 | } |
469ef350 PB |
2535 | |
2536 | if (ret == 0) { | |
2537 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2538 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2539 | } | |
2540 | return ret; | |
756e6736 KW |
2541 | } |
2542 | ||
6ebdcee2 JC |
2543 | /* |
2544 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2545 | * | |
2546 | * active is the current topmost image. | |
2547 | * | |
2548 | * Returns NULL if bs is not found in active's image chain, | |
2549 | * or if active == bs. | |
2550 | */ | |
2551 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2552 | BlockDriverState *bs) | |
2553 | { | |
2554 | BlockDriverState *overlay = NULL; | |
2555 | BlockDriverState *intermediate; | |
2556 | ||
2557 | assert(active != NULL); | |
2558 | assert(bs != NULL); | |
2559 | ||
2560 | /* if bs is the same as active, then by definition it has no overlay | |
2561 | */ | |
2562 | if (active == bs) { | |
2563 | return NULL; | |
2564 | } | |
2565 | ||
2566 | intermediate = active; | |
2567 | while (intermediate->backing_hd) { | |
2568 | if (intermediate->backing_hd == bs) { | |
2569 | overlay = intermediate; | |
2570 | break; | |
2571 | } | |
2572 | intermediate = intermediate->backing_hd; | |
2573 | } | |
2574 | ||
2575 | return overlay; | |
2576 | } | |
2577 | ||
2578 | typedef struct BlkIntermediateStates { | |
2579 | BlockDriverState *bs; | |
2580 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2581 | } BlkIntermediateStates; | |
2582 | ||
2583 | ||
2584 | /* | |
2585 | * Drops images above 'base' up to and including 'top', and sets the image | |
2586 | * above 'top' to have base as its backing file. | |
2587 | * | |
2588 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2589 | * information in 'bs' can be properly updated. | |
2590 | * | |
2591 | * E.g., this will convert the following chain: | |
2592 | * bottom <- base <- intermediate <- top <- active | |
2593 | * | |
2594 | * to | |
2595 | * | |
2596 | * bottom <- base <- active | |
2597 | * | |
2598 | * It is allowed for bottom==base, in which case it converts: | |
2599 | * | |
2600 | * base <- intermediate <- top <- active | |
2601 | * | |
2602 | * to | |
2603 | * | |
2604 | * base <- active | |
2605 | * | |
2606 | * Error conditions: | |
2607 | * if active == top, that is considered an error | |
2608 | * | |
2609 | */ | |
2610 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2611 | BlockDriverState *base) | |
2612 | { | |
2613 | BlockDriverState *intermediate; | |
2614 | BlockDriverState *base_bs = NULL; | |
2615 | BlockDriverState *new_top_bs = NULL; | |
2616 | BlkIntermediateStates *intermediate_state, *next; | |
2617 | int ret = -EIO; | |
2618 | ||
2619 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2620 | QSIMPLEQ_INIT(&states_to_delete); | |
2621 | ||
2622 | if (!top->drv || !base->drv) { | |
2623 | goto exit; | |
2624 | } | |
2625 | ||
2626 | new_top_bs = bdrv_find_overlay(active, top); | |
2627 | ||
2628 | if (new_top_bs == NULL) { | |
2629 | /* we could not find the image above 'top', this is an error */ | |
2630 | goto exit; | |
2631 | } | |
2632 | ||
2633 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2634 | * to do, no intermediate images */ | |
2635 | if (new_top_bs->backing_hd == base) { | |
2636 | ret = 0; | |
2637 | goto exit; | |
2638 | } | |
2639 | ||
2640 | intermediate = top; | |
2641 | ||
2642 | /* now we will go down through the list, and add each BDS we find | |
2643 | * into our deletion queue, until we hit the 'base' | |
2644 | */ | |
2645 | while (intermediate) { | |
2646 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2647 | intermediate_state->bs = intermediate; | |
2648 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2649 | ||
2650 | if (intermediate->backing_hd == base) { | |
2651 | base_bs = intermediate->backing_hd; | |
2652 | break; | |
2653 | } | |
2654 | intermediate = intermediate->backing_hd; | |
2655 | } | |
2656 | if (base_bs == NULL) { | |
2657 | /* something went wrong, we did not end at the base. safely | |
2658 | * unravel everything, and exit with error */ | |
2659 | goto exit; | |
2660 | } | |
2661 | ||
2662 | /* success - we can delete the intermediate states, and link top->base */ | |
2663 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2664 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2665 | if (ret) { | |
2666 | goto exit; | |
2667 | } | |
920beae1 | 2668 | bdrv_set_backing_hd(new_top_bs, base_bs); |
6ebdcee2 JC |
2669 | |
2670 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2671 | /* so that bdrv_close() does not recursively close the chain */ | |
920beae1 | 2672 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
4f6fd349 | 2673 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2674 | } |
2675 | ret = 0; | |
2676 | ||
2677 | exit: | |
2678 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2679 | g_free(intermediate_state); | |
2680 | } | |
2681 | return ret; | |
2682 | } | |
2683 | ||
2684 | ||
71d0770c AL |
2685 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2686 | size_t size) | |
2687 | { | |
2688 | int64_t len; | |
2689 | ||
1dd3a447 KW |
2690 | if (size > INT_MAX) { |
2691 | return -EIO; | |
2692 | } | |
2693 | ||
71d0770c AL |
2694 | if (!bdrv_is_inserted(bs)) |
2695 | return -ENOMEDIUM; | |
2696 | ||
2697 | if (bs->growable) | |
2698 | return 0; | |
2699 | ||
2700 | len = bdrv_getlength(bs); | |
2701 | ||
fbb7b4e0 KW |
2702 | if (offset < 0) |
2703 | return -EIO; | |
2704 | ||
2705 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2706 | return -EIO; |
2707 | ||
2708 | return 0; | |
2709 | } | |
2710 | ||
2711 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2712 | int nb_sectors) | |
2713 | { | |
54db38a4 | 2714 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
8f4754ed KW |
2715 | return -EIO; |
2716 | } | |
2717 | ||
eb5a3165 JS |
2718 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2719 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2720 | } |
2721 | ||
1c9805a3 SH |
2722 | typedef struct RwCo { |
2723 | BlockDriverState *bs; | |
775aa8b6 | 2724 | int64_t offset; |
1c9805a3 SH |
2725 | QEMUIOVector *qiov; |
2726 | bool is_write; | |
2727 | int ret; | |
4105eaaa | 2728 | BdrvRequestFlags flags; |
1c9805a3 SH |
2729 | } RwCo; |
2730 | ||
2731 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2732 | { |
1c9805a3 | 2733 | RwCo *rwco = opaque; |
ea2384d3 | 2734 | |
1c9805a3 | 2735 | if (!rwco->is_write) { |
775aa8b6 KW |
2736 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2737 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2738 | rwco->flags); |
775aa8b6 KW |
2739 | } else { |
2740 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2741 | rwco->qiov->size, rwco->qiov, | |
2742 | rwco->flags); | |
1c9805a3 SH |
2743 | } |
2744 | } | |
e7a8a783 | 2745 | |
1c9805a3 | 2746 | /* |
8d3b1a2d | 2747 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2748 | */ |
775aa8b6 KW |
2749 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2750 | QEMUIOVector *qiov, bool is_write, | |
2751 | BdrvRequestFlags flags) | |
1c9805a3 | 2752 | { |
1c9805a3 SH |
2753 | Coroutine *co; |
2754 | RwCo rwco = { | |
2755 | .bs = bs, | |
775aa8b6 | 2756 | .offset = offset, |
8d3b1a2d | 2757 | .qiov = qiov, |
1c9805a3 SH |
2758 | .is_write = is_write, |
2759 | .ret = NOT_DONE, | |
4105eaaa | 2760 | .flags = flags, |
1c9805a3 | 2761 | }; |
e7a8a783 | 2762 | |
498e386c ZYW |
2763 | /** |
2764 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2765 | * will not fire; so the I/O throttling function has to be disabled here | |
2766 | * if it has been enabled. | |
2767 | */ | |
2768 | if (bs->io_limits_enabled) { | |
2769 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2770 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2771 | bdrv_io_limits_disable(bs); | |
2772 | } | |
2773 | ||
1c9805a3 SH |
2774 | if (qemu_in_coroutine()) { |
2775 | /* Fast-path if already in coroutine context */ | |
2776 | bdrv_rw_co_entry(&rwco); | |
2777 | } else { | |
2778 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2779 | qemu_coroutine_enter(co, &rwco); | |
2780 | while (rwco.ret == NOT_DONE) { | |
2781 | qemu_aio_wait(); | |
2782 | } | |
2783 | } | |
2784 | return rwco.ret; | |
2785 | } | |
b338082b | 2786 | |
8d3b1a2d KW |
2787 | /* |
2788 | * Process a synchronous request using coroutines | |
2789 | */ | |
2790 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2791 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2792 | { |
2793 | QEMUIOVector qiov; | |
2794 | struct iovec iov = { | |
2795 | .iov_base = (void *)buf, | |
2796 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2797 | }; | |
2798 | ||
da15ee51 KW |
2799 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
2800 | return -EINVAL; | |
2801 | } | |
2802 | ||
8d3b1a2d | 2803 | qemu_iovec_init_external(&qiov, &iov, 1); |
775aa8b6 KW |
2804 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2805 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2806 | } |
2807 | ||
1c9805a3 SH |
2808 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2809 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2810 | uint8_t *buf, int nb_sectors) | |
2811 | { | |
4105eaaa | 2812 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2813 | } |
2814 | ||
07d27a44 MA |
2815 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2816 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2817 | uint8_t *buf, int nb_sectors) | |
2818 | { | |
2819 | bool enabled; | |
2820 | int ret; | |
2821 | ||
2822 | enabled = bs->io_limits_enabled; | |
2823 | bs->io_limits_enabled = false; | |
4e7395e8 | 2824 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2825 | bs->io_limits_enabled = enabled; |
2826 | return ret; | |
2827 | } | |
2828 | ||
5fafdf24 | 2829 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2830 | -EIO generic I/O error (may happen for all errors) |
2831 | -ENOMEDIUM No media inserted. | |
2832 | -EINVAL Invalid sector number or nb_sectors | |
2833 | -EACCES Trying to write a read-only device | |
2834 | */ | |
5fafdf24 | 2835 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2836 | const uint8_t *buf, int nb_sectors) |
2837 | { | |
4105eaaa | 2838 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2839 | } |
2840 | ||
aa7bfbff PL |
2841 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2842 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2843 | { |
2844 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2845 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2846 | } |
2847 | ||
d75cbb5e PL |
2848 | /* |
2849 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2850 | * The operation is sped up by checking the block status and only writing | |
2851 | * zeroes to the device if they currently do not return zeroes. Optional | |
2852 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2853 | * | |
2854 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2855 | */ | |
2856 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2857 | { | |
9ce10c0b | 2858 | int64_t target_size; |
d75cbb5e PL |
2859 | int64_t ret, nb_sectors, sector_num = 0; |
2860 | int n; | |
2861 | ||
9ce10c0b KW |
2862 | target_size = bdrv_getlength(bs); |
2863 | if (target_size < 0) { | |
2864 | return target_size; | |
2865 | } | |
2866 | target_size /= BDRV_SECTOR_SIZE; | |
2867 | ||
d75cbb5e PL |
2868 | for (;;) { |
2869 | nb_sectors = target_size - sector_num; | |
2870 | if (nb_sectors <= 0) { | |
2871 | return 0; | |
2872 | } | |
2873 | if (nb_sectors > INT_MAX) { | |
2874 | nb_sectors = INT_MAX; | |
2875 | } | |
2876 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2877 | if (ret < 0) { |
2878 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2879 | sector_num, strerror(-ret)); | |
2880 | return ret; | |
2881 | } | |
d75cbb5e PL |
2882 | if (ret & BDRV_BLOCK_ZERO) { |
2883 | sector_num += n; | |
2884 | continue; | |
2885 | } | |
2886 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2887 | if (ret < 0) { | |
2888 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2889 | sector_num, strerror(-ret)); | |
2890 | return ret; | |
2891 | } | |
2892 | sector_num += n; | |
2893 | } | |
2894 | } | |
2895 | ||
a3ef6571 | 2896 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2897 | { |
a3ef6571 KW |
2898 | QEMUIOVector qiov; |
2899 | struct iovec iov = { | |
2900 | .iov_base = (void *)buf, | |
2901 | .iov_len = bytes, | |
2902 | }; | |
9a8c4cce | 2903 | int ret; |
83f64091 | 2904 | |
a3ef6571 KW |
2905 | if (bytes < 0) { |
2906 | return -EINVAL; | |
83f64091 FB |
2907 | } |
2908 | ||
a3ef6571 KW |
2909 | qemu_iovec_init_external(&qiov, &iov, 1); |
2910 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2911 | if (ret < 0) { | |
2912 | return ret; | |
83f64091 | 2913 | } |
a3ef6571 KW |
2914 | |
2915 | return bytes; | |
83f64091 FB |
2916 | } |
2917 | ||
8d3b1a2d | 2918 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2919 | { |
9a8c4cce | 2920 | int ret; |
83f64091 | 2921 | |
8407d5d7 KW |
2922 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2923 | if (ret < 0) { | |
2924 | return ret; | |
83f64091 FB |
2925 | } |
2926 | ||
8d3b1a2d KW |
2927 | return qiov->size; |
2928 | } | |
2929 | ||
2930 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2931 | const void *buf, int bytes) |
8d3b1a2d KW |
2932 | { |
2933 | QEMUIOVector qiov; | |
2934 | struct iovec iov = { | |
2935 | .iov_base = (void *) buf, | |
8407d5d7 | 2936 | .iov_len = bytes, |
8d3b1a2d KW |
2937 | }; |
2938 | ||
8407d5d7 KW |
2939 | if (bytes < 0) { |
2940 | return -EINVAL; | |
2941 | } | |
2942 | ||
8d3b1a2d KW |
2943 | qemu_iovec_init_external(&qiov, &iov, 1); |
2944 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2945 | } |
83f64091 | 2946 | |
f08145fe KW |
2947 | /* |
2948 | * Writes to the file and ensures that no writes are reordered across this | |
2949 | * request (acts as a barrier) | |
2950 | * | |
2951 | * Returns 0 on success, -errno in error cases. | |
2952 | */ | |
2953 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2954 | const void *buf, int count) | |
2955 | { | |
2956 | int ret; | |
2957 | ||
2958 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2959 | if (ret < 0) { | |
2960 | return ret; | |
2961 | } | |
2962 | ||
f05fa4ad PB |
2963 | /* No flush needed for cache modes that already do it */ |
2964 | if (bs->enable_write_cache) { | |
f08145fe KW |
2965 | bdrv_flush(bs); |
2966 | } | |
2967 | ||
2968 | return 0; | |
2969 | } | |
2970 | ||
470c0504 | 2971 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2972 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2973 | { | |
2974 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2975 | * their read buffer while the operation is in progress do not end up | |
2976 | * modifying the image file. This is critical for zero-copy guest I/O | |
2977 | * where anything might happen inside guest memory. | |
2978 | */ | |
2979 | void *bounce_buffer; | |
2980 | ||
79c053bd | 2981 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2982 | struct iovec iov; |
2983 | QEMUIOVector bounce_qiov; | |
2984 | int64_t cluster_sector_num; | |
2985 | int cluster_nb_sectors; | |
2986 | size_t skip_bytes; | |
2987 | int ret; | |
2988 | ||
2989 | /* Cover entire cluster so no additional backing file I/O is required when | |
2990 | * allocating cluster in the image file. | |
2991 | */ | |
343bded4 PB |
2992 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2993 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2994 | |
470c0504 SH |
2995 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2996 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2997 | |
2998 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2999 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
3000 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
3001 | ||
79c053bd SH |
3002 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
3003 | &bounce_qiov); | |
ab185921 SH |
3004 | if (ret < 0) { |
3005 | goto err; | |
3006 | } | |
3007 | ||
79c053bd SH |
3008 | if (drv->bdrv_co_write_zeroes && |
3009 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 3010 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 3011 | cluster_nb_sectors, 0); |
79c053bd | 3012 | } else { |
f05fa4ad PB |
3013 | /* This does not change the data on the disk, it is not necessary |
3014 | * to flush even in cache=writethrough mode. | |
3015 | */ | |
79c053bd | 3016 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 3017 | &bounce_qiov); |
79c053bd SH |
3018 | } |
3019 | ||
ab185921 SH |
3020 | if (ret < 0) { |
3021 | /* It might be okay to ignore write errors for guest requests. If this | |
3022 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
3023 | * Simply report it in all cases. | |
3024 | */ | |
3025 | goto err; | |
3026 | } | |
3027 | ||
3028 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
3029 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
3030 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
3031 | |
3032 | err: | |
3033 | qemu_vfree(bounce_buffer); | |
3034 | return ret; | |
3035 | } | |
3036 | ||
c5fbe571 | 3037 | /* |
d0c7f642 KW |
3038 | * Forwards an already correctly aligned request to the BlockDriver. This |
3039 | * handles copy on read and zeroing after EOF; any other features must be | |
3040 | * implemented by the caller. | |
c5fbe571 | 3041 | */ |
d0c7f642 | 3042 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 3043 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 3044 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
3045 | { |
3046 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3047 | int ret; |
da1fa91d | 3048 | |
d0c7f642 KW |
3049 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3050 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 3051 | |
d0c7f642 KW |
3052 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3053 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
3054 | ||
3055 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 3056 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
3057 | /* If we touch the same cluster it counts as an overlap. This |
3058 | * guarantees that allocating writes will be serialized and not race | |
3059 | * with each other for the same cluster. For example, in copy-on-read | |
3060 | * it ensures that the CoR read and write operations are atomic and | |
3061 | * guest writes cannot interleave between them. */ | |
3062 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
3063 | } |
3064 | ||
2dbafdc0 | 3065 | wait_serialising_requests(req); |
f4658285 | 3066 | |
470c0504 | 3067 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
3068 | int pnum; |
3069 | ||
bdad13b9 | 3070 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
3071 | if (ret < 0) { |
3072 | goto out; | |
3073 | } | |
3074 | ||
3075 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 3076 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
3077 | goto out; |
3078 | } | |
3079 | } | |
3080 | ||
d0c7f642 | 3081 | /* Forward the request to the BlockDriver */ |
893a8f62 MK |
3082 | if (!(bs->zero_beyond_eof && bs->growable)) { |
3083 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
3084 | } else { | |
3085 | /* Read zeros after EOF of growable BDSes */ | |
3086 | int64_t len, total_sectors, max_nb_sectors; | |
3087 | ||
3088 | len = bdrv_getlength(bs); | |
3089 | if (len < 0) { | |
3090 | ret = len; | |
3091 | goto out; | |
3092 | } | |
3093 | ||
d055a1fe | 3094 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
5f5bcd80 KW |
3095 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
3096 | align >> BDRV_SECTOR_BITS); | |
893a8f62 MK |
3097 | if (max_nb_sectors > 0) { |
3098 | ret = drv->bdrv_co_readv(bs, sector_num, | |
3099 | MIN(nb_sectors, max_nb_sectors), qiov); | |
3100 | } else { | |
3101 | ret = 0; | |
3102 | } | |
3103 | ||
3104 | /* Reading beyond end of file is supposed to produce zeroes */ | |
3105 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
3106 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
3107 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
3108 | BDRV_SECTOR_SIZE; | |
3109 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
3110 | } | |
3111 | } | |
ab185921 SH |
3112 | |
3113 | out: | |
dbffbdcf | 3114 | return ret; |
da1fa91d KW |
3115 | } |
3116 | ||
d0c7f642 KW |
3117 | /* |
3118 | * Handle a read request in coroutine context | |
3119 | */ | |
1b0288ae KW |
3120 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
3121 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
3122 | BdrvRequestFlags flags) |
3123 | { | |
3124 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
3125 | BdrvTrackedRequest req; |
3126 | ||
1b0288ae KW |
3127 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3128 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3129 | uint8_t *head_buf = NULL; | |
3130 | uint8_t *tail_buf = NULL; | |
3131 | QEMUIOVector local_qiov; | |
3132 | bool use_local_qiov = false; | |
d0c7f642 KW |
3133 | int ret; |
3134 | ||
3135 | if (!drv) { | |
3136 | return -ENOMEDIUM; | |
3137 | } | |
1b0288ae | 3138 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
d0c7f642 KW |
3139 | return -EIO; |
3140 | } | |
3141 | ||
3142 | if (bs->copy_on_read) { | |
3143 | flags |= BDRV_REQ_COPY_ON_READ; | |
3144 | } | |
3145 | ||
3146 | /* throttling disk I/O */ | |
3147 | if (bs->io_limits_enabled) { | |
d5103588 | 3148 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3149 | } |
3150 | ||
3151 | /* Align read if necessary by padding qiov */ | |
3152 | if (offset & (align - 1)) { | |
3153 | head_buf = qemu_blockalign(bs, align); | |
3154 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3155 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3156 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3157 | use_local_qiov = true; | |
3158 | ||
3159 | bytes += offset & (align - 1); | |
3160 | offset = offset & ~(align - 1); | |
3161 | } | |
3162 | ||
3163 | if ((offset + bytes) & (align - 1)) { | |
3164 | if (!use_local_qiov) { | |
3165 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3166 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3167 | use_local_qiov = true; | |
3168 | } | |
3169 | tail_buf = qemu_blockalign(bs, align); | |
3170 | qemu_iovec_add(&local_qiov, tail_buf, | |
3171 | align - ((offset + bytes) & (align - 1))); | |
3172 | ||
3173 | bytes = ROUND_UP(bytes, align); | |
3174 | } | |
3175 | ||
65afd211 | 3176 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3177 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3178 | use_local_qiov ? &local_qiov : qiov, |
3179 | flags); | |
65afd211 | 3180 | tracked_request_end(&req); |
1b0288ae KW |
3181 | |
3182 | if (use_local_qiov) { | |
3183 | qemu_iovec_destroy(&local_qiov); | |
3184 | qemu_vfree(head_buf); | |
3185 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3186 | } |
3187 | ||
d0c7f642 KW |
3188 | return ret; |
3189 | } | |
3190 | ||
1b0288ae KW |
3191 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3192 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3193 | BdrvRequestFlags flags) | |
3194 | { | |
3195 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { | |
3196 | return -EINVAL; | |
3197 | } | |
3198 | ||
3199 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3200 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3201 | } | |
3202 | ||
c5fbe571 | 3203 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3204 | int nb_sectors, QEMUIOVector *qiov) |
3205 | { | |
c5fbe571 | 3206 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3207 | |
470c0504 SH |
3208 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3209 | } | |
3210 | ||
3211 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3212 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3213 | { | |
3214 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3215 | ||
3216 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3217 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3218 | } |
3219 | ||
c31cb707 PL |
3220 | /* if no limit is specified in the BlockLimits use a default |
3221 | * of 32768 512-byte sectors (16 MiB) per request. | |
3222 | */ | |
3223 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
3224 | ||
f08f2dda | 3225 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3226 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3227 | { |
3228 | BlockDriver *drv = bs->drv; | |
3229 | QEMUIOVector qiov; | |
c31cb707 PL |
3230 | struct iovec iov = {0}; |
3231 | int ret = 0; | |
f08f2dda | 3232 | |
c31cb707 PL |
3233 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
3234 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 3235 | |
c31cb707 PL |
3236 | while (nb_sectors > 0 && !ret) { |
3237 | int num = nb_sectors; | |
3238 | ||
b8d71c09 PB |
3239 | /* Align request. Block drivers can expect the "bulk" of the request |
3240 | * to be aligned. | |
3241 | */ | |
3242 | if (bs->bl.write_zeroes_alignment | |
3243 | && num > bs->bl.write_zeroes_alignment) { | |
3244 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3245 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3246 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3247 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3248 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3249 | /* Shorten the request to the last aligned sector. num cannot | |
3250 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3251 | */ | |
3252 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3253 | } |
621f0589 | 3254 | } |
f08f2dda | 3255 | |
c31cb707 PL |
3256 | /* limit request size */ |
3257 | if (num > max_write_zeroes) { | |
3258 | num = max_write_zeroes; | |
3259 | } | |
3260 | ||
3261 | ret = -ENOTSUP; | |
3262 | /* First try the efficient write zeroes operation */ | |
3263 | if (drv->bdrv_co_write_zeroes) { | |
3264 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3265 | } | |
3266 | ||
3267 | if (ret == -ENOTSUP) { | |
3268 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
3269 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
3270 | if (iov.iov_base == NULL) { | |
b8d71c09 PB |
3271 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3272 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); | |
c31cb707 PL |
3273 | } |
3274 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3275 | |
c31cb707 | 3276 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3277 | |
3278 | /* Keep bounce buffer around if it is big enough for all | |
3279 | * all future requests. | |
3280 | */ | |
3281 | if (num < max_write_zeroes) { | |
3282 | qemu_vfree(iov.iov_base); | |
3283 | iov.iov_base = NULL; | |
3284 | } | |
c31cb707 PL |
3285 | } |
3286 | ||
3287 | sector_num += num; | |
3288 | nb_sectors -= num; | |
3289 | } | |
f08f2dda SH |
3290 | |
3291 | qemu_vfree(iov.iov_base); | |
3292 | return ret; | |
3293 | } | |
3294 | ||
c5fbe571 | 3295 | /* |
b404f720 | 3296 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3297 | */ |
b404f720 | 3298 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3299 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3300 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3301 | { |
3302 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3303 | bool waited; |
6b7cb247 | 3304 | int ret; |
da1fa91d | 3305 | |
b404f720 KW |
3306 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3307 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3308 | |
b404f720 KW |
3309 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3310 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
cc0681c4 | 3311 | |
28de2dcd KW |
3312 | waited = wait_serialising_requests(req); |
3313 | assert(!waited || !req->serialising); | |
af91f9a7 KW |
3314 | assert(req->overlap_offset <= offset); |
3315 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); | |
244eadef | 3316 | |
65afd211 | 3317 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
d616b224 | 3318 | |
465bee1d PL |
3319 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
3320 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && | |
3321 | qemu_iovec_is_zero(qiov)) { | |
3322 | flags |= BDRV_REQ_ZERO_WRITE; | |
3323 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { | |
3324 | flags |= BDRV_REQ_MAY_UNMAP; | |
3325 | } | |
3326 | } | |
3327 | ||
d616b224 SH |
3328 | if (ret < 0) { |
3329 | /* Do nothing, write notifier decided to fail this request */ | |
3330 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
9e1cb96d | 3331 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
aa7bfbff | 3332 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3333 | } else { |
9e1cb96d | 3334 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
f08f2dda SH |
3335 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
3336 | } | |
9e1cb96d | 3337 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
6b7cb247 | 3338 | |
f05fa4ad PB |
3339 | if (ret == 0 && !bs->enable_write_cache) { |
3340 | ret = bdrv_co_flush(bs); | |
3341 | } | |
3342 | ||
e4654d2d | 3343 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
3344 | |
3345 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
3346 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
3347 | } | |
df2a6f29 PB |
3348 | if (bs->growable && ret >= 0) { |
3349 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
3350 | } | |
da1fa91d | 3351 | |
6b7cb247 | 3352 | return ret; |
da1fa91d KW |
3353 | } |
3354 | ||
b404f720 KW |
3355 | /* |
3356 | * Handle a write request in coroutine context | |
3357 | */ | |
6601553e KW |
3358 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3359 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3360 | BdrvRequestFlags flags) |
3361 | { | |
65afd211 | 3362 | BdrvTrackedRequest req; |
3b8242e0 KW |
3363 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3364 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3365 | uint8_t *head_buf = NULL; | |
3366 | uint8_t *tail_buf = NULL; | |
3367 | QEMUIOVector local_qiov; | |
3368 | bool use_local_qiov = false; | |
b404f720 KW |
3369 | int ret; |
3370 | ||
3371 | if (!bs->drv) { | |
3372 | return -ENOMEDIUM; | |
3373 | } | |
3374 | if (bs->read_only) { | |
3375 | return -EACCES; | |
3376 | } | |
6601553e | 3377 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
b404f720 KW |
3378 | return -EIO; |
3379 | } | |
3380 | ||
b404f720 KW |
3381 | /* throttling disk I/O */ |
3382 | if (bs->io_limits_enabled) { | |
d5103588 | 3383 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3384 | } |
3385 | ||
3b8242e0 KW |
3386 | /* |
3387 | * Align write if necessary by performing a read-modify-write cycle. | |
3388 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3389 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3390 | */ | |
65afd211 | 3391 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3392 | |
3393 | if (offset & (align - 1)) { | |
3394 | QEMUIOVector head_qiov; | |
3395 | struct iovec head_iov; | |
3396 | ||
3397 | mark_request_serialising(&req, align); | |
3398 | wait_serialising_requests(&req); | |
3399 | ||
3400 | head_buf = qemu_blockalign(bs, align); | |
3401 | head_iov = (struct iovec) { | |
3402 | .iov_base = head_buf, | |
3403 | .iov_len = align, | |
3404 | }; | |
3405 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3406 | ||
9e1cb96d | 3407 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3408 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3409 | align, &head_qiov, 0); | |
3410 | if (ret < 0) { | |
3411 | goto fail; | |
3412 | } | |
9e1cb96d | 3413 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3414 | |
3415 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3416 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3417 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3418 | use_local_qiov = true; | |
3419 | ||
3420 | bytes += offset & (align - 1); | |
3421 | offset = offset & ~(align - 1); | |
3422 | } | |
3423 | ||
3424 | if ((offset + bytes) & (align - 1)) { | |
3425 | QEMUIOVector tail_qiov; | |
3426 | struct iovec tail_iov; | |
3427 | size_t tail_bytes; | |
28de2dcd | 3428 | bool waited; |
3b8242e0 KW |
3429 | |
3430 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3431 | waited = wait_serialising_requests(&req); |
3432 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3433 | |
3434 | tail_buf = qemu_blockalign(bs, align); | |
3435 | tail_iov = (struct iovec) { | |
3436 | .iov_base = tail_buf, | |
3437 | .iov_len = align, | |
3438 | }; | |
3439 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3440 | ||
9e1cb96d | 3441 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3442 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3443 | align, &tail_qiov, 0); | |
3444 | if (ret < 0) { | |
3445 | goto fail; | |
3446 | } | |
9e1cb96d | 3447 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3448 | |
3449 | if (!use_local_qiov) { | |
3450 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3451 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3452 | use_local_qiov = true; | |
3453 | } | |
3454 | ||
3455 | tail_bytes = (offset + bytes) & (align - 1); | |
3456 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3457 | ||
3458 | bytes = ROUND_UP(bytes, align); | |
3459 | } | |
3460 | ||
3461 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, | |
3462 | use_local_qiov ? &local_qiov : qiov, | |
3463 | flags); | |
3464 | ||
3465 | fail: | |
65afd211 | 3466 | tracked_request_end(&req); |
b404f720 | 3467 | |
3b8242e0 KW |
3468 | if (use_local_qiov) { |
3469 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3470 | } |
99c4a85c KW |
3471 | qemu_vfree(head_buf); |
3472 | qemu_vfree(tail_buf); | |
3b8242e0 | 3473 | |
b404f720 KW |
3474 | return ret; |
3475 | } | |
3476 | ||
6601553e KW |
3477 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3478 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3479 | BdrvRequestFlags flags) | |
3480 | { | |
3481 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { | |
3482 | return -EINVAL; | |
3483 | } | |
3484 | ||
3485 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3486 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3487 | } | |
3488 | ||
c5fbe571 SH |
3489 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3490 | int nb_sectors, QEMUIOVector *qiov) | |
3491 | { | |
3492 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3493 | ||
f08f2dda SH |
3494 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3495 | } | |
3496 | ||
3497 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3498 | int64_t sector_num, int nb_sectors, |
3499 | BdrvRequestFlags flags) | |
f08f2dda | 3500 | { |
94d6ff21 | 3501 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3502 | |
d32f35cb PL |
3503 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3504 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3505 | } | |
3506 | ||
f08f2dda | 3507 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3508 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3509 | } |
3510 | ||
83f64091 FB |
3511 | /** |
3512 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3513 | */ | |
3514 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3515 | { | |
3516 | BlockDriver *drv = bs->drv; | |
51762288 | 3517 | int ret; |
83f64091 | 3518 | if (!drv) |
19cb3738 | 3519 | return -ENOMEDIUM; |
83f64091 FB |
3520 | if (!drv->bdrv_truncate) |
3521 | return -ENOTSUP; | |
59f2689d NS |
3522 | if (bs->read_only) |
3523 | return -EACCES; | |
3718d8ab | 3524 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { |
8591675f | 3525 | return -EBUSY; |
3718d8ab | 3526 | } |
51762288 SH |
3527 | ret = drv->bdrv_truncate(bs, offset); |
3528 | if (ret == 0) { | |
3529 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3530 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3531 | } |
3532 | return ret; | |
83f64091 FB |
3533 | } |
3534 | ||
4a1d5e1f FZ |
3535 | /** |
3536 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3537 | * allocated space. Return < 0 if error or unknown. | |
3538 | */ | |
3539 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3540 | { | |
3541 | BlockDriver *drv = bs->drv; | |
3542 | if (!drv) { | |
3543 | return -ENOMEDIUM; | |
3544 | } | |
3545 | if (drv->bdrv_get_allocated_file_size) { | |
3546 | return drv->bdrv_get_allocated_file_size(bs); | |
3547 | } | |
3548 | if (bs->file) { | |
3549 | return bdrv_get_allocated_file_size(bs->file); | |
3550 | } | |
3551 | return -ENOTSUP; | |
3552 | } | |
3553 | ||
83f64091 FB |
3554 | /** |
3555 | * Length of a file in bytes. Return < 0 if error or unknown. | |
3556 | */ | |
3557 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3558 | { | |
3559 | BlockDriver *drv = bs->drv; | |
3560 | if (!drv) | |
19cb3738 | 3561 | return -ENOMEDIUM; |
51762288 | 3562 | |
b94a2610 KW |
3563 | if (drv->has_variable_length) { |
3564 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3565 | if (ret < 0) { | |
3566 | return ret; | |
46a4e4e6 | 3567 | } |
83f64091 | 3568 | } |
46a4e4e6 | 3569 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
3570 | } |
3571 | ||
19cb3738 | 3572 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3573 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3574 | { |
19cb3738 FB |
3575 | int64_t length; |
3576 | length = bdrv_getlength(bs); | |
3577 | if (length < 0) | |
3578 | length = 0; | |
3579 | else | |
6ea44308 | 3580 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 3581 | *nb_sectors_ptr = length; |
fc01f7e7 | 3582 | } |
cf98951b | 3583 | |
ff06f5f3 PB |
3584 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3585 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3586 | { |
3587 | bs->on_read_error = on_read_error; | |
3588 | bs->on_write_error = on_write_error; | |
3589 | } | |
3590 | ||
1ceee0d5 | 3591 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3592 | { |
3593 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3594 | } | |
3595 | ||
3e1caa5f PB |
3596 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3597 | { | |
3598 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3599 | ||
3600 | switch (on_err) { | |
3601 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
3602 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
3603 | case BLOCKDEV_ON_ERROR_STOP: | |
3604 | return BDRV_ACTION_STOP; | |
3605 | case BLOCKDEV_ON_ERROR_REPORT: | |
3606 | return BDRV_ACTION_REPORT; | |
3607 | case BLOCKDEV_ON_ERROR_IGNORE: | |
3608 | return BDRV_ACTION_IGNORE; | |
3609 | default: | |
3610 | abort(); | |
3611 | } | |
3612 | } | |
3613 | ||
3614 | /* This is done by device models because, while the block layer knows | |
3615 | * about the error, it does not know whether an operation comes from | |
3616 | * the device or the block layer (from a job, for example). | |
3617 | */ | |
3618 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3619 | bool is_read, int error) | |
3620 | { | |
3621 | assert(error >= 0); | |
32c81a4a | 3622 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
3623 | if (action == BDRV_ACTION_STOP) { |
3624 | vm_stop(RUN_STATE_IO_ERROR); | |
3625 | bdrv_iostatus_set_err(bs, error); | |
3626 | } | |
3627 | } | |
3628 | ||
b338082b FB |
3629 | int bdrv_is_read_only(BlockDriverState *bs) |
3630 | { | |
3631 | return bs->read_only; | |
3632 | } | |
3633 | ||
985a03b0 TS |
3634 | int bdrv_is_sg(BlockDriverState *bs) |
3635 | { | |
3636 | return bs->sg; | |
3637 | } | |
3638 | ||
e900a7b7 CH |
3639 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3640 | { | |
3641 | return bs->enable_write_cache; | |
3642 | } | |
3643 | ||
425b0148 PB |
3644 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3645 | { | |
3646 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3647 | |
3648 | /* so a reopen() will preserve wce */ | |
3649 | if (wce) { | |
3650 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3651 | } else { | |
3652 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3653 | } | |
425b0148 PB |
3654 | } |
3655 | ||
ea2384d3 FB |
3656 | int bdrv_is_encrypted(BlockDriverState *bs) |
3657 | { | |
3658 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3659 | return 1; | |
3660 | return bs->encrypted; | |
3661 | } | |
3662 | ||
c0f4ce77 AL |
3663 | int bdrv_key_required(BlockDriverState *bs) |
3664 | { | |
3665 | BlockDriverState *backing_hd = bs->backing_hd; | |
3666 | ||
3667 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3668 | return 1; | |
3669 | return (bs->encrypted && !bs->valid_key); | |
3670 | } | |
3671 | ||
ea2384d3 FB |
3672 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3673 | { | |
3674 | int ret; | |
3675 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3676 | ret = bdrv_set_key(bs->backing_hd, key); | |
3677 | if (ret < 0) | |
3678 | return ret; | |
3679 | if (!bs->encrypted) | |
3680 | return 0; | |
3681 | } | |
fd04a2ae SH |
3682 | if (!bs->encrypted) { |
3683 | return -EINVAL; | |
3684 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3685 | return -ENOMEDIUM; | |
3686 | } | |
c0f4ce77 | 3687 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3688 | if (ret < 0) { |
3689 | bs->valid_key = 0; | |
3690 | } else if (!bs->valid_key) { | |
3691 | bs->valid_key = 1; | |
3692 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3693 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3694 | } |
c0f4ce77 | 3695 | return ret; |
ea2384d3 FB |
3696 | } |
3697 | ||
f8d6bba1 | 3698 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3699 | { |
f8d6bba1 | 3700 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3701 | } |
3702 | ||
5fafdf24 | 3703 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3704 | void *opaque) |
3705 | { | |
3706 | BlockDriver *drv; | |
e855e4fb JC |
3707 | int count = 0; |
3708 | const char **formats = NULL; | |
ea2384d3 | 3709 | |
8a22f02a | 3710 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
e855e4fb JC |
3711 | if (drv->format_name) { |
3712 | bool found = false; | |
3713 | int i = count; | |
3714 | while (formats && i && !found) { | |
3715 | found = !strcmp(formats[--i], drv->format_name); | |
3716 | } | |
3717 | ||
3718 | if (!found) { | |
3719 | formats = g_realloc(formats, (count + 1) * sizeof(char *)); | |
3720 | formats[count++] = drv->format_name; | |
3721 | it(opaque, drv->format_name); | |
3722 | } | |
3723 | } | |
ea2384d3 | 3724 | } |
e855e4fb | 3725 | g_free(formats); |
ea2384d3 FB |
3726 | } |
3727 | ||
dc364f4c | 3728 | /* This function is to find block backend bs */ |
b338082b FB |
3729 | BlockDriverState *bdrv_find(const char *name) |
3730 | { | |
3731 | BlockDriverState *bs; | |
3732 | ||
dc364f4c | 3733 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
1b7bdbc1 | 3734 | if (!strcmp(name, bs->device_name)) { |
b338082b | 3735 | return bs; |
1b7bdbc1 | 3736 | } |
b338082b FB |
3737 | } |
3738 | return NULL; | |
3739 | } | |
3740 | ||
dc364f4c BC |
3741 | /* This function is to find a node in the bs graph */ |
3742 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3743 | { | |
3744 | BlockDriverState *bs; | |
3745 | ||
3746 | assert(node_name); | |
3747 | ||
3748 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3749 | if (!strcmp(node_name, bs->node_name)) { | |
3750 | return bs; | |
3751 | } | |
3752 | } | |
3753 | return NULL; | |
3754 | } | |
3755 | ||
c13163fb BC |
3756 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3757 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3758 | { | |
3759 | BlockDeviceInfoList *list, *entry; | |
3760 | BlockDriverState *bs; | |
3761 | ||
3762 | list = NULL; | |
3763 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3764 | entry = g_malloc0(sizeof(*entry)); | |
3765 | entry->value = bdrv_block_device_info(bs); | |
3766 | entry->next = list; | |
3767 | list = entry; | |
3768 | } | |
3769 | ||
3770 | return list; | |
3771 | } | |
3772 | ||
12d3ba82 BC |
3773 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3774 | const char *node_name, | |
3775 | Error **errp) | |
3776 | { | |
3777 | BlockDriverState *bs = NULL; | |
3778 | ||
12d3ba82 BC |
3779 | if (device) { |
3780 | bs = bdrv_find(device); | |
3781 | ||
dd67fa50 BC |
3782 | if (bs) { |
3783 | return bs; | |
12d3ba82 | 3784 | } |
12d3ba82 BC |
3785 | } |
3786 | ||
dd67fa50 BC |
3787 | if (node_name) { |
3788 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3789 | |
dd67fa50 BC |
3790 | if (bs) { |
3791 | return bs; | |
3792 | } | |
12d3ba82 BC |
3793 | } |
3794 | ||
dd67fa50 BC |
3795 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3796 | device ? device : "", | |
3797 | node_name ? node_name : ""); | |
3798 | return NULL; | |
12d3ba82 BC |
3799 | } |
3800 | ||
2f399b0a MA |
3801 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3802 | { | |
3803 | if (!bs) { | |
3804 | return QTAILQ_FIRST(&bdrv_states); | |
3805 | } | |
dc364f4c | 3806 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3807 | } |
3808 | ||
51de9760 | 3809 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3810 | { |
3811 | BlockDriverState *bs; | |
3812 | ||
dc364f4c | 3813 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
51de9760 | 3814 | it(opaque, bs); |
81d0912d FB |
3815 | } |
3816 | } | |
3817 | ||
ea2384d3 FB |
3818 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3819 | { | |
3820 | return bs->device_name; | |
3821 | } | |
3822 | ||
c8433287 MA |
3823 | int bdrv_get_flags(BlockDriverState *bs) |
3824 | { | |
3825 | return bs->open_flags; | |
3826 | } | |
3827 | ||
f0f0fdfe | 3828 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3829 | { |
3830 | BlockDriverState *bs; | |
f0f0fdfe | 3831 | int result = 0; |
c6ca28d6 | 3832 | |
dc364f4c | 3833 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
f0f0fdfe KW |
3834 | int ret = bdrv_flush(bs); |
3835 | if (ret < 0 && !result) { | |
3836 | result = ret; | |
3837 | } | |
1b7bdbc1 | 3838 | } |
f0f0fdfe KW |
3839 | |
3840 | return result; | |
c6ca28d6 AL |
3841 | } |
3842 | ||
3ac21627 PL |
3843 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3844 | { | |
3845 | return 1; | |
3846 | } | |
3847 | ||
f2feebbd KW |
3848 | int bdrv_has_zero_init(BlockDriverState *bs) |
3849 | { | |
3850 | assert(bs->drv); | |
3851 | ||
11212d8f PB |
3852 | /* If BS is a copy on write image, it is initialized to |
3853 | the contents of the base image, which may not be zeroes. */ | |
3854 | if (bs->backing_hd) { | |
3855 | return 0; | |
3856 | } | |
336c1c12 KW |
3857 | if (bs->drv->bdrv_has_zero_init) { |
3858 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3859 | } |
3860 | ||
3ac21627 PL |
3861 | /* safe default */ |
3862 | return 0; | |
f2feebbd KW |
3863 | } |
3864 | ||
4ce78691 PL |
3865 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3866 | { | |
3867 | BlockDriverInfo bdi; | |
3868 | ||
3869 | if (bs->backing_hd) { | |
3870 | return false; | |
3871 | } | |
3872 | ||
3873 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3874 | return bdi.unallocated_blocks_are_zero; | |
3875 | } | |
3876 | ||
3877 | return false; | |
3878 | } | |
3879 | ||
3880 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3881 | { | |
3882 | BlockDriverInfo bdi; | |
3883 | ||
3884 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3885 | return false; | |
3886 | } | |
3887 | ||
3888 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3889 | return bdi.can_write_zeroes_with_unmap; | |
3890 | } | |
3891 | ||
3892 | return false; | |
3893 | } | |
3894 | ||
b6b8a333 | 3895 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 3896 | BlockDriverState *bs; |
b35b2bba | 3897 | BlockDriverState *base; |
376ae3f1 SH |
3898 | int64_t sector_num; |
3899 | int nb_sectors; | |
3900 | int *pnum; | |
b6b8a333 | 3901 | int64_t ret; |
376ae3f1 | 3902 | bool done; |
b6b8a333 | 3903 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 3904 | |
f58c7b35 TS |
3905 | /* |
3906 | * Returns true iff the specified sector is present in the disk image. Drivers | |
3907 | * not implementing the functionality are assumed to not support backing files, | |
3908 | * hence all their sectors are reported as allocated. | |
3909 | * | |
bd9533e3 SH |
3910 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
3911 | * and 'pnum' is set to 0. | |
3912 | * | |
f58c7b35 TS |
3913 | * 'pnum' is set to the number of sectors (including and immediately following |
3914 | * the specified sector) that are known to be in the same | |
3915 | * allocated/unallocated state. | |
3916 | * | |
bd9533e3 SH |
3917 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
3918 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 3919 | */ |
b6b8a333 PB |
3920 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
3921 | int64_t sector_num, | |
3922 | int nb_sectors, int *pnum) | |
f58c7b35 | 3923 | { |
617ccb46 | 3924 | int64_t length; |
bd9533e3 | 3925 | int64_t n; |
5daa74a6 | 3926 | int64_t ret, ret2; |
bd9533e3 | 3927 | |
617ccb46 PB |
3928 | length = bdrv_getlength(bs); |
3929 | if (length < 0) { | |
3930 | return length; | |
3931 | } | |
3932 | ||
3933 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { | |
bd9533e3 SH |
3934 | *pnum = 0; |
3935 | return 0; | |
3936 | } | |
3937 | ||
3938 | n = bs->total_sectors - sector_num; | |
3939 | if (n < nb_sectors) { | |
3940 | nb_sectors = n; | |
3941 | } | |
3942 | ||
b6b8a333 | 3943 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 3944 | *pnum = nb_sectors; |
e88ae226 | 3945 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
918e92d7 PB |
3946 | if (bs->drv->protocol_name) { |
3947 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
3948 | } | |
3949 | return ret; | |
f58c7b35 | 3950 | } |
6aebab14 | 3951 | |
415b5b01 PB |
3952 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
3953 | if (ret < 0) { | |
3e0a233d | 3954 | *pnum = 0; |
415b5b01 PB |
3955 | return ret; |
3956 | } | |
3957 | ||
92bc50a5 PL |
3958 | if (ret & BDRV_BLOCK_RAW) { |
3959 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
3960 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3961 | *pnum, pnum); | |
3962 | } | |
3963 | ||
e88ae226 KW |
3964 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
3965 | ret |= BDRV_BLOCK_ALLOCATED; | |
3966 | } | |
3967 | ||
c3d86884 PL |
3968 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
3969 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 3970 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 3971 | } else if (bs->backing_hd) { |
f0ad5712 PB |
3972 | BlockDriverState *bs2 = bs->backing_hd; |
3973 | int64_t length2 = bdrv_getlength(bs2); | |
3974 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { | |
3975 | ret |= BDRV_BLOCK_ZERO; | |
3976 | } | |
3977 | } | |
415b5b01 | 3978 | } |
5daa74a6 PB |
3979 | |
3980 | if (bs->file && | |
3981 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
3982 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
3983 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
3984 | *pnum, pnum); | |
3985 | if (ret2 >= 0) { | |
3986 | /* Ignore errors. This is just providing extra information, it | |
3987 | * is useful but not necessary. | |
3988 | */ | |
3989 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
3990 | } | |
3991 | } | |
3992 | ||
415b5b01 | 3993 | return ret; |
060f51c9 SH |
3994 | } |
3995 | ||
b6b8a333 PB |
3996 | /* Coroutine wrapper for bdrv_get_block_status() */ |
3997 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 3998 | { |
b6b8a333 | 3999 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
4000 | BlockDriverState *bs = data->bs; |
4001 | ||
b6b8a333 PB |
4002 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
4003 | data->pnum); | |
060f51c9 SH |
4004 | data->done = true; |
4005 | } | |
4006 | ||
4007 | /* | |
b6b8a333 | 4008 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 4009 | * |
b6b8a333 | 4010 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 4011 | */ |
b6b8a333 PB |
4012 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
4013 | int nb_sectors, int *pnum) | |
060f51c9 | 4014 | { |
6aebab14 | 4015 | Coroutine *co; |
b6b8a333 | 4016 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
4017 | .bs = bs, |
4018 | .sector_num = sector_num, | |
4019 | .nb_sectors = nb_sectors, | |
4020 | .pnum = pnum, | |
4021 | .done = false, | |
4022 | }; | |
4023 | ||
bdad13b9 PB |
4024 | if (qemu_in_coroutine()) { |
4025 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 4026 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 4027 | } else { |
b6b8a333 | 4028 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
4029 | qemu_coroutine_enter(co, &data); |
4030 | while (!data.done) { | |
4031 | qemu_aio_wait(); | |
4032 | } | |
6aebab14 SH |
4033 | } |
4034 | return data.ret; | |
f58c7b35 TS |
4035 | } |
4036 | ||
b6b8a333 PB |
4037 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
4038 | int nb_sectors, int *pnum) | |
4039 | { | |
4333bb71 PB |
4040 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
4041 | if (ret < 0) { | |
4042 | return ret; | |
4043 | } | |
e88ae226 | 4044 | return (ret & BDRV_BLOCK_ALLOCATED); |
b6b8a333 PB |
4045 | } |
4046 | ||
188a7bbf PB |
4047 | /* |
4048 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
4049 | * | |
4050 | * Return true if the given sector is allocated in any image between | |
4051 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
4052 | * sector is allocated in any image of the chain. Return false otherwise. | |
4053 | * | |
4054 | * 'pnum' is set to the number of sectors (including and immediately following | |
4055 | * the specified sector) that are known to be in the same | |
4056 | * allocated/unallocated state. | |
4057 | * | |
4058 | */ | |
4f578637 PB |
4059 | int bdrv_is_allocated_above(BlockDriverState *top, |
4060 | BlockDriverState *base, | |
4061 | int64_t sector_num, | |
4062 | int nb_sectors, int *pnum) | |
188a7bbf PB |
4063 | { |
4064 | BlockDriverState *intermediate; | |
4065 | int ret, n = nb_sectors; | |
4066 | ||
4067 | intermediate = top; | |
4068 | while (intermediate && intermediate != base) { | |
4069 | int pnum_inter; | |
bdad13b9 PB |
4070 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
4071 | &pnum_inter); | |
188a7bbf PB |
4072 | if (ret < 0) { |
4073 | return ret; | |
4074 | } else if (ret) { | |
4075 | *pnum = pnum_inter; | |
4076 | return 1; | |
4077 | } | |
4078 | ||
4079 | /* | |
4080 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
4081 | * might have | |
4082 | * | |
4083 | * [sector_num+x, nr_sectors] allocated. | |
4084 | */ | |
63ba17d3 VI |
4085 | if (n > pnum_inter && |
4086 | (intermediate == top || | |
4087 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
4088 | n = pnum_inter; |
4089 | } | |
4090 | ||
4091 | intermediate = intermediate->backing_hd; | |
4092 | } | |
4093 | ||
4094 | *pnum = n; | |
4095 | return 0; | |
4096 | } | |
4097 | ||
045df330 AL |
4098 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
4099 | { | |
4100 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
4101 | return bs->backing_file; | |
4102 | else if (bs->encrypted) | |
4103 | return bs->filename; | |
4104 | else | |
4105 | return NULL; | |
4106 | } | |
4107 | ||
5fafdf24 | 4108 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
4109 | char *filename, int filename_size) |
4110 | { | |
3574c608 | 4111 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
4112 | } |
4113 | ||
5fafdf24 | 4114 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
4115 | const uint8_t *buf, int nb_sectors) |
4116 | { | |
4117 | BlockDriver *drv = bs->drv; | |
4118 | if (!drv) | |
19cb3738 | 4119 | return -ENOMEDIUM; |
faea38e7 FB |
4120 | if (!drv->bdrv_write_compressed) |
4121 | return -ENOTSUP; | |
fbb7b4e0 KW |
4122 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
4123 | return -EIO; | |
a55eb92c | 4124 | |
e4654d2d | 4125 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 4126 | |
faea38e7 FB |
4127 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
4128 | } | |
3b46e624 | 4129 | |
faea38e7 FB |
4130 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
4131 | { | |
4132 | BlockDriver *drv = bs->drv; | |
4133 | if (!drv) | |
19cb3738 | 4134 | return -ENOMEDIUM; |
faea38e7 FB |
4135 | if (!drv->bdrv_get_info) |
4136 | return -ENOTSUP; | |
4137 | memset(bdi, 0, sizeof(*bdi)); | |
4138 | return drv->bdrv_get_info(bs, bdi); | |
4139 | } | |
4140 | ||
eae041fe HR |
4141 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
4142 | { | |
4143 | BlockDriver *drv = bs->drv; | |
4144 | if (drv && drv->bdrv_get_specific_info) { | |
4145 | return drv->bdrv_get_specific_info(bs); | |
4146 | } | |
4147 | return NULL; | |
4148 | } | |
4149 | ||
45566e9c CH |
4150 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
4151 | int64_t pos, int size) | |
cf8074b3 KW |
4152 | { |
4153 | QEMUIOVector qiov; | |
4154 | struct iovec iov = { | |
4155 | .iov_base = (void *) buf, | |
4156 | .iov_len = size, | |
4157 | }; | |
4158 | ||
4159 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4160 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
4161 | } | |
4162 | ||
4163 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4164 | { |
4165 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4166 | |
4167 | if (!drv) { | |
178e08a5 | 4168 | return -ENOMEDIUM; |
cf8074b3 KW |
4169 | } else if (drv->bdrv_save_vmstate) { |
4170 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4171 | } else if (bs->file) { | |
4172 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4173 | } | |
4174 | ||
7cdb1f6d | 4175 | return -ENOTSUP; |
178e08a5 AL |
4176 | } |
4177 | ||
45566e9c CH |
4178 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4179 | int64_t pos, int size) | |
178e08a5 AL |
4180 | { |
4181 | BlockDriver *drv = bs->drv; | |
4182 | if (!drv) | |
4183 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4184 | if (drv->bdrv_load_vmstate) |
4185 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4186 | if (bs->file) | |
4187 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4188 | return -ENOTSUP; | |
178e08a5 AL |
4189 | } |
4190 | ||
8b9b0cc2 KW |
4191 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4192 | { | |
bf736fe3 | 4193 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4194 | return; |
4195 | } | |
4196 | ||
bf736fe3 | 4197 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4198 | } |
4199 | ||
4200 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4201 | const char *tag) | |
4202 | { | |
4203 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4204 | bs = bs->file; | |
4205 | } | |
4206 | ||
4207 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4208 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4209 | } | |
4210 | ||
4211 | return -ENOTSUP; | |
4212 | } | |
4213 | ||
4cc70e93 FZ |
4214 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4215 | { | |
4216 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4217 | bs = bs->file; | |
4218 | } | |
4219 | ||
4220 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4221 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4222 | } | |
4223 | ||
4224 | return -ENOTSUP; | |
4225 | } | |
4226 | ||
41c695c7 KW |
4227 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4228 | { | |
938789ea | 4229 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
41c695c7 KW |
4230 | bs = bs->file; |
4231 | } | |
8b9b0cc2 | 4232 | |
41c695c7 KW |
4233 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4234 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4235 | } | |
4236 | ||
4237 | return -ENOTSUP; | |
4238 | } | |
4239 | ||
4240 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4241 | { | |
4242 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4243 | bs = bs->file; | |
4244 | } | |
4245 | ||
4246 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4247 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4248 | } | |
4249 | ||
4250 | return false; | |
8b9b0cc2 KW |
4251 | } |
4252 | ||
199630b6 BS |
4253 | int bdrv_is_snapshot(BlockDriverState *bs) |
4254 | { | |
4255 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4256 | } | |
4257 | ||
b1b1d783 JC |
4258 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4259 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4260 | * from a BDS as backing_file should not be done, as that may be relative to | |
4261 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4262 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4263 | const char *backing_file) | |
4264 | { | |
b1b1d783 JC |
4265 | char *filename_full = NULL; |
4266 | char *backing_file_full = NULL; | |
4267 | char *filename_tmp = NULL; | |
4268 | int is_protocol = 0; | |
4269 | BlockDriverState *curr_bs = NULL; | |
4270 | BlockDriverState *retval = NULL; | |
4271 | ||
4272 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4273 | return NULL; |
4274 | } | |
4275 | ||
b1b1d783 JC |
4276 | filename_full = g_malloc(PATH_MAX); |
4277 | backing_file_full = g_malloc(PATH_MAX); | |
4278 | filename_tmp = g_malloc(PATH_MAX); | |
4279 | ||
4280 | is_protocol = path_has_protocol(backing_file); | |
4281 | ||
4282 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4283 | ||
4284 | /* If either of the filename paths is actually a protocol, then | |
4285 | * compare unmodified paths; otherwise make paths relative */ | |
4286 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4287 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4288 | retval = curr_bs->backing_hd; | |
4289 | break; | |
4290 | } | |
e8a6bb9c | 4291 | } else { |
b1b1d783 JC |
4292 | /* If not an absolute filename path, make it relative to the current |
4293 | * image's filename path */ | |
4294 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4295 | backing_file); | |
4296 | ||
4297 | /* We are going to compare absolute pathnames */ | |
4298 | if (!realpath(filename_tmp, filename_full)) { | |
4299 | continue; | |
4300 | } | |
4301 | ||
4302 | /* We need to make sure the backing filename we are comparing against | |
4303 | * is relative to the current image filename (or absolute) */ | |
4304 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4305 | curr_bs->backing_file); | |
4306 | ||
4307 | if (!realpath(filename_tmp, backing_file_full)) { | |
4308 | continue; | |
4309 | } | |
4310 | ||
4311 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4312 | retval = curr_bs->backing_hd; | |
4313 | break; | |
4314 | } | |
e8a6bb9c MT |
4315 | } |
4316 | } | |
4317 | ||
b1b1d783 JC |
4318 | g_free(filename_full); |
4319 | g_free(backing_file_full); | |
4320 | g_free(filename_tmp); | |
4321 | return retval; | |
e8a6bb9c MT |
4322 | } |
4323 | ||
f198fd1c BC |
4324 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4325 | { | |
4326 | if (!bs->drv) { | |
4327 | return 0; | |
4328 | } | |
4329 | ||
4330 | if (!bs->backing_hd) { | |
4331 | return 0; | |
4332 | } | |
4333 | ||
4334 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4335 | } | |
4336 | ||
79fac568 JC |
4337 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
4338 | { | |
4339 | BlockDriverState *curr_bs = NULL; | |
4340 | ||
4341 | if (!bs) { | |
4342 | return NULL; | |
4343 | } | |
4344 | ||
4345 | curr_bs = bs; | |
4346 | ||
4347 | while (curr_bs->backing_hd) { | |
4348 | curr_bs = curr_bs->backing_hd; | |
4349 | } | |
4350 | return curr_bs; | |
4351 | } | |
4352 | ||
ea2384d3 | 4353 | /**************************************************************/ |
83f64091 | 4354 | /* async I/Os */ |
ea2384d3 | 4355 | |
3b69e4b9 | 4356 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 4357 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 4358 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 4359 | { |
bbf0a440 SH |
4360 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4361 | ||
d20d9b7c | 4362 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4363 | cb, opaque, false); |
ea2384d3 FB |
4364 | } |
4365 | ||
f141eafe AL |
4366 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4367 | QEMUIOVector *qiov, int nb_sectors, | |
4368 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 4369 | { |
bbf0a440 SH |
4370 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4371 | ||
d20d9b7c | 4372 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4373 | cb, opaque, true); |
83f64091 FB |
4374 | } |
4375 | ||
d5ef94d4 PB |
4376 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
4377 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
4378 | BlockDriverCompletionFunc *cb, void *opaque) | |
4379 | { | |
4380 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4381 | ||
4382 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4383 | BDRV_REQ_ZERO_WRITE | flags, | |
4384 | cb, opaque, true); | |
4385 | } | |
4386 | ||
40b4f539 KW |
4387 | |
4388 | typedef struct MultiwriteCB { | |
4389 | int error; | |
4390 | int num_requests; | |
4391 | int num_callbacks; | |
4392 | struct { | |
4393 | BlockDriverCompletionFunc *cb; | |
4394 | void *opaque; | |
4395 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4396 | } callbacks[]; |
4397 | } MultiwriteCB; | |
4398 | ||
4399 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4400 | { | |
4401 | int i; | |
4402 | ||
4403 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4404 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4405 | if (mcb->callbacks[i].free_qiov) { |
4406 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4407 | } | |
7267c094 | 4408 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4409 | } |
4410 | } | |
4411 | ||
4412 | static void multiwrite_cb(void *opaque, int ret) | |
4413 | { | |
4414 | MultiwriteCB *mcb = opaque; | |
4415 | ||
6d519a5f SH |
4416 | trace_multiwrite_cb(mcb, ret); |
4417 | ||
cb6d3ca0 | 4418 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4419 | mcb->error = ret; |
40b4f539 KW |
4420 | } |
4421 | ||
4422 | mcb->num_requests--; | |
4423 | if (mcb->num_requests == 0) { | |
de189a1b | 4424 | multiwrite_user_cb(mcb); |
7267c094 | 4425 | g_free(mcb); |
40b4f539 KW |
4426 | } |
4427 | } | |
4428 | ||
4429 | static int multiwrite_req_compare(const void *a, const void *b) | |
4430 | { | |
77be4366 CH |
4431 | const BlockRequest *req1 = a, *req2 = b; |
4432 | ||
4433 | /* | |
4434 | * Note that we can't simply subtract req2->sector from req1->sector | |
4435 | * here as that could overflow the return value. | |
4436 | */ | |
4437 | if (req1->sector > req2->sector) { | |
4438 | return 1; | |
4439 | } else if (req1->sector < req2->sector) { | |
4440 | return -1; | |
4441 | } else { | |
4442 | return 0; | |
4443 | } | |
40b4f539 KW |
4444 | } |
4445 | ||
4446 | /* | |
4447 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4448 | * requests that remain after merging. | |
4449 | */ | |
4450 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4451 | int num_reqs, MultiwriteCB *mcb) | |
4452 | { | |
4453 | int i, outidx; | |
4454 | ||
4455 | // Sort requests by start sector | |
4456 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4457 | ||
4458 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4459 | // filling up gaps with zero sectors. | |
4460 | outidx = 0; | |
4461 | for (i = 1; i < num_reqs; i++) { | |
4462 | int merge = 0; | |
4463 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4464 | ||
b6a127a1 | 4465 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4466 | if (reqs[i].sector <= oldreq_last) { |
4467 | merge = 1; | |
4468 | } | |
4469 | ||
e2a305fb CH |
4470 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4471 | merge = 0; | |
4472 | } | |
4473 | ||
40b4f539 KW |
4474 | if (merge) { |
4475 | size_t size; | |
7267c094 | 4476 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4477 | qemu_iovec_init(qiov, |
4478 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4479 | ||
4480 | // Add the first request to the merged one. If the requests are | |
4481 | // overlapping, drop the last sectors of the first request. | |
4482 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4483 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4484 | |
b6a127a1 PB |
4485 | // We should need to add any zeros between the two requests |
4486 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4487 | |
4488 | // Add the second request | |
1b093c48 | 4489 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4490 | |
cbf1dff2 | 4491 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4492 | reqs[outidx].qiov = qiov; |
4493 | ||
4494 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4495 | } else { | |
4496 | outidx++; | |
4497 | reqs[outidx].sector = reqs[i].sector; | |
4498 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4499 | reqs[outidx].qiov = reqs[i].qiov; | |
4500 | } | |
4501 | } | |
4502 | ||
4503 | return outidx + 1; | |
4504 | } | |
4505 | ||
4506 | /* | |
4507 | * Submit multiple AIO write requests at once. | |
4508 | * | |
4509 | * On success, the function returns 0 and all requests in the reqs array have | |
4510 | * been submitted. In error case this function returns -1, and any of the | |
4511 | * requests may or may not be submitted yet. In particular, this means that the | |
4512 | * callback will be called for some of the requests, for others it won't. The | |
4513 | * caller must check the error field of the BlockRequest to wait for the right | |
4514 | * callbacks (if error != 0, no callback will be called). | |
4515 | * | |
4516 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4517 | * requests. However, the fields opaque and error are left unmodified as they | |
4518 | * are used to signal failure for a single request to the caller. | |
4519 | */ | |
4520 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4521 | { | |
40b4f539 KW |
4522 | MultiwriteCB *mcb; |
4523 | int i; | |
4524 | ||
301db7c2 RH |
4525 | /* don't submit writes if we don't have a medium */ |
4526 | if (bs->drv == NULL) { | |
4527 | for (i = 0; i < num_reqs; i++) { | |
4528 | reqs[i].error = -ENOMEDIUM; | |
4529 | } | |
4530 | return -1; | |
4531 | } | |
4532 | ||
40b4f539 KW |
4533 | if (num_reqs == 0) { |
4534 | return 0; | |
4535 | } | |
4536 | ||
4537 | // Create MultiwriteCB structure | |
7267c094 | 4538 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4539 | mcb->num_requests = 0; |
4540 | mcb->num_callbacks = num_reqs; | |
4541 | ||
4542 | for (i = 0; i < num_reqs; i++) { | |
4543 | mcb->callbacks[i].cb = reqs[i].cb; | |
4544 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4545 | } | |
4546 | ||
4547 | // Check for mergable requests | |
4548 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4549 | ||
6d519a5f SH |
4550 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4551 | ||
df9309fb PB |
4552 | /* Run the aio requests. */ |
4553 | mcb->num_requests = num_reqs; | |
40b4f539 | 4554 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4555 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4556 | reqs[i].nb_sectors, reqs[i].flags, | |
4557 | multiwrite_cb, mcb, | |
4558 | true); | |
40b4f539 KW |
4559 | } |
4560 | ||
4561 | return 0; | |
40b4f539 KW |
4562 | } |
4563 | ||
83f64091 | 4564 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 4565 | { |
d7331bed | 4566 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
4567 | } |
4568 | ||
4569 | /**************************************************************/ | |
4570 | /* async block device emulation */ | |
4571 | ||
c16b5a2c CH |
4572 | typedef struct BlockDriverAIOCBSync { |
4573 | BlockDriverAIOCB common; | |
4574 | QEMUBH *bh; | |
4575 | int ret; | |
4576 | /* vector translation state */ | |
4577 | QEMUIOVector *qiov; | |
4578 | uint8_t *bounce; | |
4579 | int is_write; | |
4580 | } BlockDriverAIOCBSync; | |
4581 | ||
4582 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
4583 | { | |
b666d239 KW |
4584 | BlockDriverAIOCBSync *acb = |
4585 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 4586 | qemu_bh_delete(acb->bh); |
36afc451 | 4587 | acb->bh = NULL; |
c16b5a2c CH |
4588 | qemu_aio_release(acb); |
4589 | } | |
4590 | ||
d7331bed | 4591 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
4592 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
4593 | .cancel = bdrv_aio_cancel_em, | |
4594 | }; | |
4595 | ||
ce1a14dc | 4596 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4597 | { |
ce1a14dc | 4598 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4599 | |
f141eafe | 4600 | if (!acb->is_write) |
03396148 | 4601 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 4602 | qemu_vfree(acb->bounce); |
ce1a14dc | 4603 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4604 | qemu_bh_delete(acb->bh); |
36afc451 | 4605 | acb->bh = NULL; |
ce1a14dc | 4606 | qemu_aio_release(acb); |
83f64091 | 4607 | } |
beac80cd | 4608 | |
f141eafe AL |
4609 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4610 | int64_t sector_num, | |
4611 | QEMUIOVector *qiov, | |
4612 | int nb_sectors, | |
4613 | BlockDriverCompletionFunc *cb, | |
4614 | void *opaque, | |
4615 | int is_write) | |
4616 | ||
83f64091 | 4617 | { |
ce1a14dc | 4618 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4619 | |
d7331bed | 4620 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4621 | acb->is_write = is_write; |
4622 | acb->qiov = qiov; | |
e268ca52 | 4623 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 4624 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
4625 | |
4626 | if (is_write) { | |
d5e6b161 | 4627 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4628 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4629 | } else { |
1ed20acf | 4630 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4631 | } |
4632 | ||
ce1a14dc | 4633 | qemu_bh_schedule(acb->bh); |
f141eafe | 4634 | |
ce1a14dc | 4635 | return &acb->common; |
beac80cd FB |
4636 | } |
4637 | ||
f141eafe AL |
4638 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4639 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4640 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4641 | { |
f141eafe AL |
4642 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4643 | } | |
83f64091 | 4644 | |
f141eafe AL |
4645 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4646 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4647 | BlockDriverCompletionFunc *cb, void *opaque) | |
4648 | { | |
4649 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4650 | } |
beac80cd | 4651 | |
68485420 KW |
4652 | |
4653 | typedef struct BlockDriverAIOCBCoroutine { | |
4654 | BlockDriverAIOCB common; | |
4655 | BlockRequest req; | |
4656 | bool is_write; | |
d318aea9 | 4657 | bool *done; |
68485420 KW |
4658 | QEMUBH* bh; |
4659 | } BlockDriverAIOCBCoroutine; | |
4660 | ||
4661 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
4662 | { | |
d318aea9 KW |
4663 | BlockDriverAIOCBCoroutine *acb = |
4664 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
4665 | bool done = false; | |
4666 | ||
4667 | acb->done = &done; | |
4668 | while (!done) { | |
4669 | qemu_aio_wait(); | |
4670 | } | |
68485420 KW |
4671 | } |
4672 | ||
d7331bed | 4673 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
4674 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
4675 | .cancel = bdrv_aio_co_cancel_em, | |
4676 | }; | |
4677 | ||
35246a68 | 4678 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4679 | { |
4680 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4681 | ||
4682 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
4683 | |
4684 | if (acb->done) { | |
4685 | *acb->done = true; | |
4686 | } | |
4687 | ||
68485420 KW |
4688 | qemu_bh_delete(acb->bh); |
4689 | qemu_aio_release(acb); | |
4690 | } | |
4691 | ||
b2a61371 SH |
4692 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4693 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4694 | { | |
4695 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4696 | BlockDriverState *bs = acb->common.bs; | |
4697 | ||
4698 | if (!acb->is_write) { | |
4699 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4700 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4701 | } else { |
4702 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4703 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4704 | } |
4705 | ||
35246a68 | 4706 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
4707 | qemu_bh_schedule(acb->bh); |
4708 | } | |
4709 | ||
68485420 KW |
4710 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4711 | int64_t sector_num, | |
4712 | QEMUIOVector *qiov, | |
4713 | int nb_sectors, | |
d20d9b7c | 4714 | BdrvRequestFlags flags, |
68485420 KW |
4715 | BlockDriverCompletionFunc *cb, |
4716 | void *opaque, | |
8c5873d6 | 4717 | bool is_write) |
68485420 KW |
4718 | { |
4719 | Coroutine *co; | |
4720 | BlockDriverAIOCBCoroutine *acb; | |
4721 | ||
d7331bed | 4722 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4723 | acb->req.sector = sector_num; |
4724 | acb->req.nb_sectors = nb_sectors; | |
4725 | acb->req.qiov = qiov; | |
d20d9b7c | 4726 | acb->req.flags = flags; |
68485420 | 4727 | acb->is_write = is_write; |
d318aea9 | 4728 | acb->done = NULL; |
68485420 | 4729 | |
8c5873d6 | 4730 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4731 | qemu_coroutine_enter(co, acb); |
4732 | ||
4733 | return &acb->common; | |
4734 | } | |
4735 | ||
07f07615 | 4736 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4737 | { |
07f07615 PB |
4738 | BlockDriverAIOCBCoroutine *acb = opaque; |
4739 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4740 | |
07f07615 PB |
4741 | acb->req.error = bdrv_co_flush(bs); |
4742 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 4743 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4744 | } |
4745 | ||
07f07615 | 4746 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4747 | BlockDriverCompletionFunc *cb, void *opaque) |
4748 | { | |
07f07615 | 4749 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4750 | |
07f07615 PB |
4751 | Coroutine *co; |
4752 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4753 | |
d7331bed | 4754 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
4755 | acb->done = NULL; |
4756 | ||
07f07615 PB |
4757 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4758 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4759 | |
016f5cf6 AG |
4760 | return &acb->common; |
4761 | } | |
4762 | ||
4265d620 PB |
4763 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4764 | { | |
4765 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4766 | BlockDriverState *bs = acb->common.bs; | |
4767 | ||
4768 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
4769 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
4770 | qemu_bh_schedule(acb->bh); | |
4771 | } | |
4772 | ||
4773 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4774 | int64_t sector_num, int nb_sectors, | |
4775 | BlockDriverCompletionFunc *cb, void *opaque) | |
4776 | { | |
4777 | Coroutine *co; | |
4778 | BlockDriverAIOCBCoroutine *acb; | |
4779 | ||
4780 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4781 | ||
d7331bed | 4782 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4783 | acb->req.sector = sector_num; |
4784 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 4785 | acb->done = NULL; |
4265d620 PB |
4786 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
4787 | qemu_coroutine_enter(co, acb); | |
4788 | ||
4789 | return &acb->common; | |
4790 | } | |
4791 | ||
ea2384d3 FB |
4792 | void bdrv_init(void) |
4793 | { | |
5efa9d5a | 4794 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4795 | } |
ce1a14dc | 4796 | |
eb852011 MA |
4797 | void bdrv_init_with_whitelist(void) |
4798 | { | |
4799 | use_bdrv_whitelist = 1; | |
4800 | bdrv_init(); | |
4801 | } | |
4802 | ||
d7331bed | 4803 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4804 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4805 | { |
ce1a14dc PB |
4806 | BlockDriverAIOCB *acb; |
4807 | ||
d7331bed SH |
4808 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4809 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4810 | acb->bs = bs; |
4811 | acb->cb = cb; | |
4812 | acb->opaque = opaque; | |
4813 | return acb; | |
4814 | } | |
4815 | ||
4816 | void qemu_aio_release(void *p) | |
4817 | { | |
d37c975f | 4818 | BlockDriverAIOCB *acb = p; |
d7331bed | 4819 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 4820 | } |
19cb3738 | 4821 | |
f9f05dc5 KW |
4822 | /**************************************************************/ |
4823 | /* Coroutine block device emulation */ | |
4824 | ||
4825 | typedef struct CoroutineIOCompletion { | |
4826 | Coroutine *coroutine; | |
4827 | int ret; | |
4828 | } CoroutineIOCompletion; | |
4829 | ||
4830 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4831 | { | |
4832 | CoroutineIOCompletion *co = opaque; | |
4833 | ||
4834 | co->ret = ret; | |
4835 | qemu_coroutine_enter(co->coroutine, NULL); | |
4836 | } | |
4837 | ||
4838 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4839 | int nb_sectors, QEMUIOVector *iov, | |
4840 | bool is_write) | |
4841 | { | |
4842 | CoroutineIOCompletion co = { | |
4843 | .coroutine = qemu_coroutine_self(), | |
4844 | }; | |
4845 | BlockDriverAIOCB *acb; | |
4846 | ||
4847 | if (is_write) { | |
a652d160 SH |
4848 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4849 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4850 | } else { |
a652d160 SH |
4851 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4852 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4853 | } |
4854 | ||
59370aaa | 4855 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4856 | if (!acb) { |
4857 | return -EIO; | |
4858 | } | |
4859 | qemu_coroutine_yield(); | |
4860 | ||
4861 | return co.ret; | |
4862 | } | |
4863 | ||
4864 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4865 | int64_t sector_num, int nb_sectors, | |
4866 | QEMUIOVector *iov) | |
4867 | { | |
4868 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4869 | } | |
4870 | ||
4871 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4872 | int64_t sector_num, int nb_sectors, | |
4873 | QEMUIOVector *iov) | |
4874 | { | |
4875 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4876 | } | |
4877 | ||
07f07615 | 4878 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4879 | { |
07f07615 PB |
4880 | RwCo *rwco = opaque; |
4881 | ||
4882 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4883 | } | |
4884 | ||
4885 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4886 | { | |
eb489bb1 KW |
4887 | int ret; |
4888 | ||
29cdb251 | 4889 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4890 | return 0; |
eb489bb1 KW |
4891 | } |
4892 | ||
ca716364 | 4893 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4894 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4895 | if (bs->drv->bdrv_co_flush_to_os) { |
4896 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4897 | if (ret < 0) { | |
4898 | return ret; | |
4899 | } | |
4900 | } | |
4901 | ||
ca716364 KW |
4902 | /* But don't actually force it to the disk with cache=unsafe */ |
4903 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4904 | goto flush_parent; |
ca716364 KW |
4905 | } |
4906 | ||
bf736fe3 | 4907 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4908 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4909 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4910 | } else if (bs->drv->bdrv_aio_flush) { |
4911 | BlockDriverAIOCB *acb; | |
4912 | CoroutineIOCompletion co = { | |
4913 | .coroutine = qemu_coroutine_self(), | |
4914 | }; | |
4915 | ||
4916 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4917 | if (acb == NULL) { | |
29cdb251 | 4918 | ret = -EIO; |
07f07615 PB |
4919 | } else { |
4920 | qemu_coroutine_yield(); | |
29cdb251 | 4921 | ret = co.ret; |
07f07615 | 4922 | } |
07f07615 PB |
4923 | } else { |
4924 | /* | |
4925 | * Some block drivers always operate in either writethrough or unsafe | |
4926 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4927 | * know how the server works (because the behaviour is hardcoded or | |
4928 | * depends on server-side configuration), so we can't ensure that | |
4929 | * everything is safe on disk. Returning an error doesn't work because | |
4930 | * that would break guests even if the server operates in writethrough | |
4931 | * mode. | |
4932 | * | |
4933 | * Let's hope the user knows what he's doing. | |
4934 | */ | |
29cdb251 | 4935 | ret = 0; |
07f07615 | 4936 | } |
29cdb251 PB |
4937 | if (ret < 0) { |
4938 | return ret; | |
4939 | } | |
4940 | ||
4941 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4942 | * in the case of cache=unsafe, so there are no useless flushes. | |
4943 | */ | |
d4c82329 | 4944 | flush_parent: |
29cdb251 | 4945 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4946 | } |
4947 | ||
5a8a30db | 4948 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 4949 | { |
5a8a30db KW |
4950 | Error *local_err = NULL; |
4951 | int ret; | |
4952 | ||
3456a8d1 KW |
4953 | if (!bs->drv) { |
4954 | return; | |
4955 | } | |
4956 | ||
4957 | if (bs->drv->bdrv_invalidate_cache) { | |
5a8a30db | 4958 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
3456a8d1 | 4959 | } else if (bs->file) { |
5a8a30db KW |
4960 | bdrv_invalidate_cache(bs->file, &local_err); |
4961 | } | |
4962 | if (local_err) { | |
4963 | error_propagate(errp, local_err); | |
4964 | return; | |
0f15423c | 4965 | } |
3456a8d1 | 4966 | |
5a8a30db KW |
4967 | ret = refresh_total_sectors(bs, bs->total_sectors); |
4968 | if (ret < 0) { | |
4969 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
4970 | return; | |
4971 | } | |
0f15423c AL |
4972 | } |
4973 | ||
5a8a30db | 4974 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c AL |
4975 | { |
4976 | BlockDriverState *bs; | |
5a8a30db | 4977 | Error *local_err = NULL; |
0f15423c | 4978 | |
dc364f4c | 4979 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
5a8a30db KW |
4980 | bdrv_invalidate_cache(bs, &local_err); |
4981 | if (local_err) { | |
4982 | error_propagate(errp, local_err); | |
4983 | return; | |
4984 | } | |
0f15423c AL |
4985 | } |
4986 | } | |
4987 | ||
07789269 BC |
4988 | void bdrv_clear_incoming_migration_all(void) |
4989 | { | |
4990 | BlockDriverState *bs; | |
4991 | ||
dc364f4c | 4992 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
07789269 BC |
4993 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
4994 | } | |
4995 | } | |
4996 | ||
07f07615 PB |
4997 | int bdrv_flush(BlockDriverState *bs) |
4998 | { | |
4999 | Coroutine *co; | |
5000 | RwCo rwco = { | |
5001 | .bs = bs, | |
5002 | .ret = NOT_DONE, | |
e7a8a783 | 5003 | }; |
e7a8a783 | 5004 | |
07f07615 PB |
5005 | if (qemu_in_coroutine()) { |
5006 | /* Fast-path if already in coroutine context */ | |
5007 | bdrv_flush_co_entry(&rwco); | |
5008 | } else { | |
5009 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
5010 | qemu_coroutine_enter(co, &rwco); | |
5011 | while (rwco.ret == NOT_DONE) { | |
5012 | qemu_aio_wait(); | |
5013 | } | |
e7a8a783 | 5014 | } |
07f07615 PB |
5015 | |
5016 | return rwco.ret; | |
e7a8a783 KW |
5017 | } |
5018 | ||
775aa8b6 KW |
5019 | typedef struct DiscardCo { |
5020 | BlockDriverState *bs; | |
5021 | int64_t sector_num; | |
5022 | int nb_sectors; | |
5023 | int ret; | |
5024 | } DiscardCo; | |
4265d620 PB |
5025 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
5026 | { | |
775aa8b6 | 5027 | DiscardCo *rwco = opaque; |
4265d620 PB |
5028 | |
5029 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
5030 | } | |
5031 | ||
6f14da52 PL |
5032 | /* if no limit is specified in the BlockLimits use a default |
5033 | * of 32768 512-byte sectors (16 MiB) per request. | |
5034 | */ | |
5035 | #define MAX_DISCARD_DEFAULT 32768 | |
5036 | ||
4265d620 PB |
5037 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
5038 | int nb_sectors) | |
5039 | { | |
d51e9fe5 PB |
5040 | int max_discard; |
5041 | ||
4265d620 PB |
5042 | if (!bs->drv) { |
5043 | return -ENOMEDIUM; | |
5044 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
5045 | return -EIO; | |
5046 | } else if (bs->read_only) { | |
5047 | return -EROFS; | |
df702c9b PB |
5048 | } |
5049 | ||
e4654d2d | 5050 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 5051 | |
9e8f1835 PB |
5052 | /* Do nothing if disabled. */ |
5053 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
5054 | return 0; | |
5055 | } | |
5056 | ||
d51e9fe5 PB |
5057 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
5058 | return 0; | |
5059 | } | |
6f14da52 | 5060 | |
d51e9fe5 PB |
5061 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
5062 | while (nb_sectors > 0) { | |
5063 | int ret; | |
5064 | int num = nb_sectors; | |
6f14da52 | 5065 | |
d51e9fe5 PB |
5066 | /* align request */ |
5067 | if (bs->bl.discard_alignment && | |
5068 | num >= bs->bl.discard_alignment && | |
5069 | sector_num % bs->bl.discard_alignment) { | |
5070 | if (num > bs->bl.discard_alignment) { | |
5071 | num = bs->bl.discard_alignment; | |
6f14da52 | 5072 | } |
d51e9fe5 PB |
5073 | num -= sector_num % bs->bl.discard_alignment; |
5074 | } | |
6f14da52 | 5075 | |
d51e9fe5 PB |
5076 | /* limit request size */ |
5077 | if (num > max_discard) { | |
5078 | num = max_discard; | |
5079 | } | |
6f14da52 | 5080 | |
d51e9fe5 | 5081 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 5082 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
5083 | } else { |
5084 | BlockDriverAIOCB *acb; | |
5085 | CoroutineIOCompletion co = { | |
5086 | .coroutine = qemu_coroutine_self(), | |
5087 | }; | |
5088 | ||
5089 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
5090 | bdrv_co_io_em_complete, &co); | |
5091 | if (acb == NULL) { | |
5092 | return -EIO; | |
5093 | } else { | |
5094 | qemu_coroutine_yield(); | |
5095 | ret = co.ret; | |
6f14da52 | 5096 | } |
6f14da52 | 5097 | } |
7ce21016 | 5098 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 5099 | return ret; |
4265d620 | 5100 | } |
d51e9fe5 PB |
5101 | |
5102 | sector_num += num; | |
5103 | nb_sectors -= num; | |
4265d620 | 5104 | } |
d51e9fe5 | 5105 | return 0; |
4265d620 PB |
5106 | } |
5107 | ||
5108 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
5109 | { | |
5110 | Coroutine *co; | |
775aa8b6 | 5111 | DiscardCo rwco = { |
4265d620 PB |
5112 | .bs = bs, |
5113 | .sector_num = sector_num, | |
5114 | .nb_sectors = nb_sectors, | |
5115 | .ret = NOT_DONE, | |
5116 | }; | |
5117 | ||
5118 | if (qemu_in_coroutine()) { | |
5119 | /* Fast-path if already in coroutine context */ | |
5120 | bdrv_discard_co_entry(&rwco); | |
5121 | } else { | |
5122 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
5123 | qemu_coroutine_enter(co, &rwco); | |
5124 | while (rwco.ret == NOT_DONE) { | |
5125 | qemu_aio_wait(); | |
5126 | } | |
5127 | } | |
5128 | ||
5129 | return rwco.ret; | |
5130 | } | |
5131 | ||
19cb3738 FB |
5132 | /**************************************************************/ |
5133 | /* removable device support */ | |
5134 | ||
5135 | /** | |
5136 | * Return TRUE if the media is present | |
5137 | */ | |
5138 | int bdrv_is_inserted(BlockDriverState *bs) | |
5139 | { | |
5140 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 5141 | |
19cb3738 FB |
5142 | if (!drv) |
5143 | return 0; | |
5144 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
5145 | return 1; |
5146 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
5147 | } |
5148 | ||
5149 | /** | |
8e49ca46 MA |
5150 | * Return whether the media changed since the last call to this |
5151 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
5152 | */ |
5153 | int bdrv_media_changed(BlockDriverState *bs) | |
5154 | { | |
5155 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5156 | |
8e49ca46 MA |
5157 | if (drv && drv->bdrv_media_changed) { |
5158 | return drv->bdrv_media_changed(bs); | |
5159 | } | |
5160 | return -ENOTSUP; | |
19cb3738 FB |
5161 | } |
5162 | ||
5163 | /** | |
5164 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
5165 | */ | |
f36f3949 | 5166 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
5167 | { |
5168 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5169 | |
822e1cd1 MA |
5170 | if (drv && drv->bdrv_eject) { |
5171 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 5172 | } |
6f382ed2 LC |
5173 | |
5174 | if (bs->device_name[0] != '\0') { | |
5175 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
5176 | } | |
19cb3738 FB |
5177 | } |
5178 | ||
19cb3738 FB |
5179 | /** |
5180 | * Lock or unlock the media (if it is locked, the user won't be able | |
5181 | * to eject it manually). | |
5182 | */ | |
025e849a | 5183 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
5184 | { |
5185 | BlockDriver *drv = bs->drv; | |
5186 | ||
025e849a | 5187 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5188 | |
025e849a MA |
5189 | if (drv && drv->bdrv_lock_medium) { |
5190 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5191 | } |
5192 | } | |
985a03b0 TS |
5193 | |
5194 | /* needed for generic scsi interface */ | |
5195 | ||
5196 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5197 | { | |
5198 | BlockDriver *drv = bs->drv; | |
5199 | ||
5200 | if (drv && drv->bdrv_ioctl) | |
5201 | return drv->bdrv_ioctl(bs, req, buf); | |
5202 | return -ENOTSUP; | |
5203 | } | |
7d780669 | 5204 | |
221f715d AL |
5205 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
5206 | unsigned long int req, void *buf, | |
5207 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 5208 | { |
221f715d | 5209 | BlockDriver *drv = bs->drv; |
7d780669 | 5210 | |
221f715d AL |
5211 | if (drv && drv->bdrv_aio_ioctl) |
5212 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5213 | return NULL; | |
7d780669 | 5214 | } |
e268ca52 | 5215 | |
1b7fd729 | 5216 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5217 | { |
1b7fd729 | 5218 | bs->guest_block_size = align; |
7b6f9300 | 5219 | } |
7cd1e32a | 5220 | |
e268ca52 AL |
5221 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5222 | { | |
339064d5 | 5223 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5224 | } |
7cd1e32a | 5225 | |
c53b1c51 SH |
5226 | /* |
5227 | * Check if all memory in this vector is sector aligned. | |
5228 | */ | |
5229 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5230 | { | |
5231 | int i; | |
339064d5 | 5232 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5233 | |
5234 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5235 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5236 | return false; |
1ff735bd | 5237 | } |
339064d5 | 5238 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5239 | return false; |
c53b1c51 SH |
5240 | } |
5241 | } | |
5242 | ||
5243 | return true; | |
5244 | } | |
5245 | ||
b8afb520 FZ |
5246 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
5247 | Error **errp) | |
7cd1e32a LS |
5248 | { |
5249 | int64_t bitmap_size; | |
e4654d2d | 5250 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 5251 | |
50717e94 PB |
5252 | assert((granularity & (granularity - 1)) == 0); |
5253 | ||
e4654d2d FZ |
5254 | granularity >>= BDRV_SECTOR_BITS; |
5255 | assert(granularity); | |
b8afb520 FZ |
5256 | bitmap_size = bdrv_getlength(bs); |
5257 | if (bitmap_size < 0) { | |
5258 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); | |
5259 | errno = -bitmap_size; | |
5260 | return NULL; | |
5261 | } | |
5262 | bitmap_size >>= BDRV_SECTOR_BITS; | |
e4654d2d FZ |
5263 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); |
5264 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
5265 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
5266 | return bitmap; | |
5267 | } | |
5268 | ||
5269 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
5270 | { | |
5271 | BdrvDirtyBitmap *bm, *next; | |
5272 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5273 | if (bm == bitmap) { | |
5274 | QLIST_REMOVE(bitmap, list); | |
5275 | hbitmap_free(bitmap->bitmap); | |
5276 | g_free(bitmap); | |
5277 | return; | |
a55eb92c | 5278 | } |
7cd1e32a LS |
5279 | } |
5280 | } | |
5281 | ||
21b56835 FZ |
5282 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5283 | { | |
5284 | BdrvDirtyBitmap *bm; | |
5285 | BlockDirtyInfoList *list = NULL; | |
5286 | BlockDirtyInfoList **plist = &list; | |
5287 | ||
5288 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5289 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); | |
5290 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); | |
5291 | info->count = bdrv_get_dirty_count(bs, bm); | |
5292 | info->granularity = | |
5293 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
5294 | entry->value = info; | |
5295 | *plist = entry; | |
5296 | plist = &entry->next; | |
5297 | } | |
5298 | ||
5299 | return list; | |
5300 | } | |
5301 | ||
e4654d2d | 5302 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5303 | { |
e4654d2d FZ |
5304 | if (bitmap) { |
5305 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5306 | } else { |
5307 | return 0; | |
5308 | } | |
5309 | } | |
5310 | ||
e4654d2d FZ |
5311 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
5312 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 5313 | { |
e4654d2d | 5314 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5315 | } |
5316 | ||
5317 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
5318 | int nr_sectors) | |
5319 | { | |
e4654d2d FZ |
5320 | BdrvDirtyBitmap *bitmap; |
5321 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5322 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5323 | } | |
1755da16 PB |
5324 | } |
5325 | ||
e4654d2d | 5326 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 5327 | { |
e4654d2d FZ |
5328 | BdrvDirtyBitmap *bitmap; |
5329 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5330 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5331 | } | |
7cd1e32a | 5332 | } |
aaa0eb75 | 5333 | |
e4654d2d | 5334 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5335 | { |
e4654d2d | 5336 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5337 | } |
f88e1a42 | 5338 | |
9fcb0251 FZ |
5339 | /* Get a reference to bs */ |
5340 | void bdrv_ref(BlockDriverState *bs) | |
5341 | { | |
5342 | bs->refcnt++; | |
5343 | } | |
5344 | ||
5345 | /* Release a previously grabbed reference to bs. | |
5346 | * If after releasing, reference count is zero, the BlockDriverState is | |
5347 | * deleted. */ | |
5348 | void bdrv_unref(BlockDriverState *bs) | |
5349 | { | |
5350 | assert(bs->refcnt > 0); | |
5351 | if (--bs->refcnt == 0) { | |
5352 | bdrv_delete(bs); | |
5353 | } | |
5354 | } | |
5355 | ||
fbe40ff7 FZ |
5356 | struct BdrvOpBlocker { |
5357 | Error *reason; | |
5358 | QLIST_ENTRY(BdrvOpBlocker) list; | |
5359 | }; | |
5360 | ||
5361 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
5362 | { | |
5363 | BdrvOpBlocker *blocker; | |
5364 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5365 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
5366 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
5367 | if (errp) { | |
5368 | error_setg(errp, "Device '%s' is busy: %s", | |
5369 | bs->device_name, error_get_pretty(blocker->reason)); | |
5370 | } | |
5371 | return true; | |
5372 | } | |
5373 | return false; | |
5374 | } | |
5375 | ||
5376 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5377 | { | |
5378 | BdrvOpBlocker *blocker; | |
5379 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5380 | ||
5381 | blocker = g_malloc0(sizeof(BdrvOpBlocker)); | |
5382 | blocker->reason = reason; | |
5383 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
5384 | } | |
5385 | ||
5386 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5387 | { | |
5388 | BdrvOpBlocker *blocker, *next; | |
5389 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5390 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
5391 | if (blocker->reason == reason) { | |
5392 | QLIST_REMOVE(blocker, list); | |
5393 | g_free(blocker); | |
5394 | } | |
5395 | } | |
5396 | } | |
5397 | ||
5398 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
5399 | { | |
5400 | int i; | |
5401 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5402 | bdrv_op_block(bs, i, reason); | |
5403 | } | |
5404 | } | |
5405 | ||
5406 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
5407 | { | |
5408 | int i; | |
5409 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5410 | bdrv_op_unblock(bs, i, reason); | |
5411 | } | |
5412 | } | |
5413 | ||
5414 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
5415 | { | |
5416 | int i; | |
5417 | ||
5418 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5419 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
5420 | return false; | |
5421 | } | |
5422 | } | |
5423 | return true; | |
5424 | } | |
5425 | ||
28a7282a LC |
5426 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5427 | { | |
d6bf279e | 5428 | bs->iostatus_enabled = true; |
58e21ef5 | 5429 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5430 | } |
5431 | ||
5432 | /* The I/O status is only enabled if the drive explicitly | |
5433 | * enables it _and_ the VM is configured to stop on errors */ | |
5434 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5435 | { | |
d6bf279e | 5436 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5437 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5438 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5439 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5440 | } |
5441 | ||
5442 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5443 | { | |
d6bf279e | 5444 | bs->iostatus_enabled = false; |
28a7282a LC |
5445 | } |
5446 | ||
5447 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5448 | { | |
5449 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5450 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5451 | if (bs->job) { |
5452 | block_job_iostatus_reset(bs->job); | |
5453 | } | |
28a7282a LC |
5454 | } |
5455 | } | |
5456 | ||
28a7282a LC |
5457 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5458 | { | |
3e1caa5f PB |
5459 | assert(bdrv_iostatus_is_enabled(bs)); |
5460 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5461 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5462 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5463 | } |
5464 | } | |
5465 | ||
a597e79c CH |
5466 | void |
5467 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
5468 | enum BlockAcctType type) | |
5469 | { | |
5470 | assert(type < BDRV_MAX_IOTYPE); | |
5471 | ||
5472 | cookie->bytes = bytes; | |
c488c7f6 | 5473 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
5474 | cookie->type = type; |
5475 | } | |
5476 | ||
5477 | void | |
5478 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
5479 | { | |
5480 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
5481 | ||
5482 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
5483 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 5484 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
5485 | } |
5486 | ||
d92ada22 LC |
5487 | void bdrv_img_create(const char *filename, const char *fmt, |
5488 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5489 | char *options, uint64_t img_size, int flags, |
5490 | Error **errp, bool quiet) | |
f88e1a42 JS |
5491 | { |
5492 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 5493 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 | 5494 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5495 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5496 | Error *local_err = NULL; |
f88e1a42 JS |
5497 | int ret = 0; |
5498 | ||
5499 | /* Find driver and parse its options */ | |
5500 | drv = bdrv_find_format(fmt); | |
5501 | if (!drv) { | |
71c79813 | 5502 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5503 | return; |
f88e1a42 JS |
5504 | } |
5505 | ||
98289620 | 5506 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 5507 | if (!proto_drv) { |
71c79813 | 5508 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 5509 | return; |
f88e1a42 JS |
5510 | } |
5511 | ||
5512 | create_options = append_option_parameters(create_options, | |
5513 | drv->create_options); | |
5514 | create_options = append_option_parameters(create_options, | |
5515 | proto_drv->create_options); | |
5516 | ||
5517 | /* Create parameter list with default values */ | |
5518 | param = parse_option_parameters("", create_options, param); | |
5519 | ||
5520 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
5521 | ||
5522 | /* Parse -o options */ | |
5523 | if (options) { | |
5524 | param = parse_option_parameters(options, create_options, param); | |
5525 | if (param == NULL) { | |
71c79813 | 5526 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
5527 | goto out; |
5528 | } | |
5529 | } | |
5530 | ||
5531 | if (base_filename) { | |
5532 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
5533 | base_filename)) { | |
71c79813 LC |
5534 | error_setg(errp, "Backing file not supported for file format '%s'", |
5535 | fmt); | |
f88e1a42 JS |
5536 | goto out; |
5537 | } | |
5538 | } | |
5539 | ||
5540 | if (base_fmt) { | |
5541 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
5542 | error_setg(errp, "Backing file format not supported for file " |
5543 | "format '%s'", fmt); | |
f88e1a42 JS |
5544 | goto out; |
5545 | } | |
5546 | } | |
5547 | ||
792da93a JS |
5548 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
5549 | if (backing_file && backing_file->value.s) { | |
5550 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
5551 | error_setg(errp, "Error: Trying to create an image with the " |
5552 | "same filename as the backing file"); | |
792da93a JS |
5553 | goto out; |
5554 | } | |
5555 | } | |
5556 | ||
f88e1a42 JS |
5557 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
5558 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
5559 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
5560 | if (!backing_drv) { | |
71c79813 LC |
5561 | error_setg(errp, "Unknown backing file format '%s'", |
5562 | backing_fmt->value.s); | |
f88e1a42 JS |
5563 | goto out; |
5564 | } | |
5565 | } | |
5566 | ||
5567 | // The size for the image must always be specified, with one exception: | |
5568 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
5569 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
5570 | if (size && size->value.n == -1) { | |
f88e1a42 | 5571 | if (backing_file && backing_file->value.s) { |
66f6b814 | 5572 | BlockDriverState *bs; |
f88e1a42 | 5573 | uint64_t size; |
f88e1a42 | 5574 | char buf[32]; |
63090dac PB |
5575 | int back_flags; |
5576 | ||
5577 | /* backing files always opened read-only */ | |
5578 | back_flags = | |
5579 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5580 | |
f67503e5 | 5581 | bs = NULL; |
ddf5636d | 5582 | ret = bdrv_open(&bs, backing_file->value.s, NULL, NULL, back_flags, |
cc84d90f | 5583 | backing_drv, &local_err); |
f88e1a42 | 5584 | if (ret < 0) { |
cc84d90f HR |
5585 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
5586 | backing_file->value.s, | |
5587 | error_get_pretty(local_err)); | |
5588 | error_free(local_err); | |
5589 | local_err = NULL; | |
f88e1a42 JS |
5590 | goto out; |
5591 | } | |
5592 | bdrv_get_geometry(bs, &size); | |
5593 | size *= 512; | |
5594 | ||
5595 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
5596 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
66f6b814 HR |
5597 | |
5598 | bdrv_unref(bs); | |
f88e1a42 | 5599 | } else { |
71c79813 | 5600 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5601 | goto out; |
5602 | } | |
5603 | } | |
5604 | ||
f382d43a MR |
5605 | if (!quiet) { |
5606 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
5607 | print_option_parameters(param); | |
5608 | puts(""); | |
5609 | } | |
cc84d90f HR |
5610 | ret = bdrv_create(drv, filename, param, &local_err); |
5611 | if (ret == -EFBIG) { | |
5612 | /* This is generally a better message than whatever the driver would | |
5613 | * deliver (especially because of the cluster_size_hint), since that | |
5614 | * is most probably not much different from "image too large". */ | |
5615 | const char *cluster_size_hint = ""; | |
5616 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
5617 | cluster_size_hint = " (try using a larger cluster size)"; | |
f88e1a42 | 5618 | } |
cc84d90f HR |
5619 | error_setg(errp, "The image size is too large for file format '%s'" |
5620 | "%s", fmt, cluster_size_hint); | |
5621 | error_free(local_err); | |
5622 | local_err = NULL; | |
f88e1a42 JS |
5623 | } |
5624 | ||
5625 | out: | |
5626 | free_option_parameters(create_options); | |
5627 | free_option_parameters(param); | |
5628 | ||
84d18f06 | 5629 | if (local_err) { |
cc84d90f HR |
5630 | error_propagate(errp, local_err); |
5631 | } | |
f88e1a42 | 5632 | } |
85d126f3 SH |
5633 | |
5634 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5635 | { | |
5636 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
5637 | return qemu_get_aio_context(); | |
5638 | } | |
d616b224 SH |
5639 | |
5640 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
5641 | NotifierWithReturn *notifier) | |
5642 | { | |
5643 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5644 | } | |
6f176b48 HR |
5645 | |
5646 | int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options) | |
5647 | { | |
5648 | if (bs->drv->bdrv_amend_options == NULL) { | |
5649 | return -ENOTSUP; | |
5650 | } | |
5651 | return bs->drv->bdrv_amend_options(bs, options); | |
5652 | } | |
f6186f49 | 5653 | |
b5042a36 BC |
5654 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
5655 | * of block filter and by bdrv_is_first_non_filter. | |
5656 | * It is used to test if the given bs is the candidate or recurse more in the | |
5657 | * node graph. | |
212a5a8f | 5658 | */ |
b5042a36 | 5659 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 5660 | BlockDriverState *candidate) |
f6186f49 | 5661 | { |
b5042a36 BC |
5662 | /* return false if basic checks fails */ |
5663 | if (!bs || !bs->drv) { | |
212a5a8f | 5664 | return false; |
f6186f49 BC |
5665 | } |
5666 | ||
b5042a36 BC |
5667 | /* the code reached a non block filter driver -> check if the bs is |
5668 | * the same as the candidate. It's the recursion termination condition. | |
5669 | */ | |
5670 | if (!bs->drv->is_filter) { | |
5671 | return bs == candidate; | |
212a5a8f | 5672 | } |
b5042a36 | 5673 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 5674 | |
b5042a36 BC |
5675 | /* If the block filter recursion method is defined use it to recurse down |
5676 | * the node graph. | |
5677 | */ | |
5678 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 5679 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5680 | } |
5681 | ||
b5042a36 BC |
5682 | /* the driver is a block filter but don't allow to recurse -> return false |
5683 | */ | |
5684 | return false; | |
f6186f49 BC |
5685 | } |
5686 | ||
212a5a8f BC |
5687 | /* This function checks if the candidate is the first non filter bs down it's |
5688 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5689 | * from the top. Some filters can choose not to pass down the recursion. | |
5690 | */ | |
5691 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5692 | { |
212a5a8f BC |
5693 | BlockDriverState *bs; |
5694 | ||
5695 | /* walk down the bs forest recursively */ | |
5696 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5697 | bool perm; | |
5698 | ||
b5042a36 | 5699 | /* try to recurse in this top level bs */ |
e6dc8a1f | 5700 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
5701 | |
5702 | /* candidate is the first non filter */ | |
5703 | if (perm) { | |
5704 | return true; | |
5705 | } | |
5706 | } | |
5707 | ||
5708 | return false; | |
f6186f49 | 5709 | } |