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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" |
737e150e PB |
27 | #include "block/block_int.h" |
28 | #include "block/blockjob.h" | |
1de7afc9 | 29 | #include "qemu/module.h" |
7b1b5d19 | 30 | #include "qapi/qmp/qjson.h" |
9c17d615 | 31 | #include "sysemu/sysemu.h" |
3ae59580 | 32 | #include "sysemu/blockdev.h" /* FIXME layering violation */ |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
c13163fb | 35 | #include "block/qapi.h" |
b2023818 | 36 | #include "qmp-commands.h" |
1de7afc9 | 37 | #include "qemu/timer.h" |
a5ee7bd4 | 38 | #include "qapi-event.h" |
fc01f7e7 | 39 | |
71e72a19 | 40 | #ifdef CONFIG_BSD |
7674e7bf FB |
41 | #include <sys/types.h> |
42 | #include <sys/stat.h> | |
43 | #include <sys/ioctl.h> | |
72cf2d4f | 44 | #include <sys/queue.h> |
c5e97233 | 45 | #ifndef __DragonFly__ |
7674e7bf FB |
46 | #include <sys/disk.h> |
47 | #endif | |
c5e97233 | 48 | #endif |
7674e7bf | 49 | |
49dc768d AL |
50 | #ifdef _WIN32 |
51 | #include <windows.h> | |
52 | #endif | |
53 | ||
e4654d2d FZ |
54 | struct BdrvDirtyBitmap { |
55 | HBitmap *bitmap; | |
56 | QLIST_ENTRY(BdrvDirtyBitmap) list; | |
57 | }; | |
58 | ||
1c9805a3 SH |
59 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
60 | ||
2a87151f SH |
61 | #define COROUTINE_POOL_RESERVATION 64 /* number of coroutines to reserve */ |
62 | ||
7d4b4ba5 | 63 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
64 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 66 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
67 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
68 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 69 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
70 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
71 | int64_t sector_num, int nb_sectors, | |
72 | QEMUIOVector *iov); | |
73 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
74 | int64_t sector_num, int nb_sectors, | |
75 | QEMUIOVector *iov); | |
775aa8b6 KW |
76 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
470c0504 | 78 | BdrvRequestFlags flags); |
775aa8b6 KW |
79 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
80 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
f08f2dda | 81 | BdrvRequestFlags flags); |
b2a61371 SH |
82 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
83 | int64_t sector_num, | |
84 | QEMUIOVector *qiov, | |
85 | int nb_sectors, | |
d20d9b7c | 86 | BdrvRequestFlags flags, |
b2a61371 SH |
87 | BlockDriverCompletionFunc *cb, |
88 | void *opaque, | |
8c5873d6 | 89 | bool is_write); |
b2a61371 | 90 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 | 91 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 92 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
ec530c81 | 93 | |
1b7bdbc1 SH |
94 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
95 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 96 | |
dc364f4c BC |
97 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
98 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); | |
99 | ||
8a22f02a SH |
100 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
101 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 102 | |
eb852011 MA |
103 | /* If non-zero, use only whitelisted block drivers */ |
104 | static int use_bdrv_whitelist; | |
105 | ||
9e0b22f4 SH |
106 | #ifdef _WIN32 |
107 | static int is_windows_drive_prefix(const char *filename) | |
108 | { | |
109 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
110 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
111 | filename[1] == ':'); | |
112 | } | |
113 | ||
114 | int is_windows_drive(const char *filename) | |
115 | { | |
116 | if (is_windows_drive_prefix(filename) && | |
117 | filename[2] == '\0') | |
118 | return 1; | |
119 | if (strstart(filename, "\\\\.\\", NULL) || | |
120 | strstart(filename, "//./", NULL)) | |
121 | return 1; | |
122 | return 0; | |
123 | } | |
124 | #endif | |
125 | ||
0563e191 | 126 | /* throttling disk I/O limits */ |
cc0681c4 BC |
127 | void bdrv_set_io_limits(BlockDriverState *bs, |
128 | ThrottleConfig *cfg) | |
98f90dba | 129 | { |
cc0681c4 | 130 | int i; |
98f90dba | 131 | |
cc0681c4 | 132 | throttle_config(&bs->throttle_state, cfg); |
98f90dba | 133 | |
cc0681c4 BC |
134 | for (i = 0; i < 2; i++) { |
135 | qemu_co_enter_next(&bs->throttled_reqs[i]); | |
98f90dba | 136 | } |
cc0681c4 BC |
137 | } |
138 | ||
139 | /* this function drain all the throttled IOs */ | |
140 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) | |
141 | { | |
142 | bool drained = false; | |
143 | bool enabled = bs->io_limits_enabled; | |
144 | int i; | |
145 | ||
146 | bs->io_limits_enabled = false; | |
147 | ||
148 | for (i = 0; i < 2; i++) { | |
149 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { | |
150 | drained = true; | |
151 | } | |
152 | } | |
153 | ||
154 | bs->io_limits_enabled = enabled; | |
98f90dba | 155 | |
cc0681c4 | 156 | return drained; |
98f90dba ZYW |
157 | } |
158 | ||
cc0681c4 | 159 | void bdrv_io_limits_disable(BlockDriverState *bs) |
0563e191 | 160 | { |
cc0681c4 | 161 | bs->io_limits_enabled = false; |
0563e191 | 162 | |
cc0681c4 BC |
163 | bdrv_start_throttled_reqs(bs); |
164 | ||
165 | throttle_destroy(&bs->throttle_state); | |
0563e191 ZYW |
166 | } |
167 | ||
cc0681c4 | 168 | static void bdrv_throttle_read_timer_cb(void *opaque) |
0563e191 | 169 | { |
cc0681c4 BC |
170 | BlockDriverState *bs = opaque; |
171 | qemu_co_enter_next(&bs->throttled_reqs[0]); | |
0563e191 ZYW |
172 | } |
173 | ||
cc0681c4 | 174 | static void bdrv_throttle_write_timer_cb(void *opaque) |
0563e191 | 175 | { |
cc0681c4 BC |
176 | BlockDriverState *bs = opaque; |
177 | qemu_co_enter_next(&bs->throttled_reqs[1]); | |
0563e191 ZYW |
178 | } |
179 | ||
cc0681c4 BC |
180 | /* should be called before bdrv_set_io_limits if a limit is set */ |
181 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
182 | { | |
183 | assert(!bs->io_limits_enabled); | |
184 | throttle_init(&bs->throttle_state, | |
13af91eb | 185 | bdrv_get_aio_context(bs), |
cc0681c4 BC |
186 | QEMU_CLOCK_VIRTUAL, |
187 | bdrv_throttle_read_timer_cb, | |
188 | bdrv_throttle_write_timer_cb, | |
189 | bs); | |
190 | bs->io_limits_enabled = true; | |
191 | } | |
192 | ||
193 | /* This function makes an IO wait if needed | |
194 | * | |
195 | * @nb_sectors: the number of sectors of the IO | |
196 | * @is_write: is the IO a write | |
197 | */ | |
98f90dba | 198 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
d5103588 | 199 | unsigned int bytes, |
cc0681c4 | 200 | bool is_write) |
98f90dba | 201 | { |
cc0681c4 BC |
202 | /* does this io must wait */ |
203 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); | |
98f90dba | 204 | |
cc0681c4 BC |
205 | /* if must wait or any request of this type throttled queue the IO */ |
206 | if (must_wait || | |
207 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { | |
208 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
209 | } |
210 | ||
cc0681c4 | 211 | /* the IO will be executed, do the accounting */ |
d5103588 KW |
212 | throttle_account(&bs->throttle_state, is_write, bytes); |
213 | ||
98f90dba | 214 | |
cc0681c4 BC |
215 | /* if the next request must wait -> do nothing */ |
216 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { | |
217 | return; | |
98f90dba ZYW |
218 | } |
219 | ||
cc0681c4 BC |
220 | /* else queue next request for execution */ |
221 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); | |
98f90dba ZYW |
222 | } |
223 | ||
339064d5 KW |
224 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
225 | { | |
226 | if (!bs || !bs->drv) { | |
227 | /* 4k should be on the safe side */ | |
228 | return 4096; | |
229 | } | |
230 | ||
231 | return bs->bl.opt_mem_alignment; | |
232 | } | |
233 | ||
9e0b22f4 SH |
234 | /* check if the path starts with "<protocol>:" */ |
235 | static int path_has_protocol(const char *path) | |
236 | { | |
947995c0 PB |
237 | const char *p; |
238 | ||
9e0b22f4 SH |
239 | #ifdef _WIN32 |
240 | if (is_windows_drive(path) || | |
241 | is_windows_drive_prefix(path)) { | |
242 | return 0; | |
243 | } | |
947995c0 PB |
244 | p = path + strcspn(path, ":/\\"); |
245 | #else | |
246 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
247 | #endif |
248 | ||
947995c0 | 249 | return *p == ':'; |
9e0b22f4 SH |
250 | } |
251 | ||
83f64091 | 252 | int path_is_absolute(const char *path) |
3b0d4f61 | 253 | { |
21664424 FB |
254 | #ifdef _WIN32 |
255 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 256 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 257 | return 1; |
f53f4da9 PB |
258 | } |
259 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 260 | #else |
f53f4da9 | 261 | return (*path == '/'); |
3b9f94e1 | 262 | #endif |
3b0d4f61 FB |
263 | } |
264 | ||
83f64091 FB |
265 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
266 | path to it by considering it is relative to base_path. URL are | |
267 | supported. */ | |
268 | void path_combine(char *dest, int dest_size, | |
269 | const char *base_path, | |
270 | const char *filename) | |
3b0d4f61 | 271 | { |
83f64091 FB |
272 | const char *p, *p1; |
273 | int len; | |
274 | ||
275 | if (dest_size <= 0) | |
276 | return; | |
277 | if (path_is_absolute(filename)) { | |
278 | pstrcpy(dest, dest_size, filename); | |
279 | } else { | |
280 | p = strchr(base_path, ':'); | |
281 | if (p) | |
282 | p++; | |
283 | else | |
284 | p = base_path; | |
3b9f94e1 FB |
285 | p1 = strrchr(base_path, '/'); |
286 | #ifdef _WIN32 | |
287 | { | |
288 | const char *p2; | |
289 | p2 = strrchr(base_path, '\\'); | |
290 | if (!p1 || p2 > p1) | |
291 | p1 = p2; | |
292 | } | |
293 | #endif | |
83f64091 FB |
294 | if (p1) |
295 | p1++; | |
296 | else | |
297 | p1 = base_path; | |
298 | if (p1 > p) | |
299 | p = p1; | |
300 | len = p - base_path; | |
301 | if (len > dest_size - 1) | |
302 | len = dest_size - 1; | |
303 | memcpy(dest, base_path, len); | |
304 | dest[len] = '\0'; | |
305 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 306 | } |
3b0d4f61 FB |
307 | } |
308 | ||
dc5a1371 PB |
309 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
310 | { | |
311 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
312 | pstrcpy(dest, sz, bs->backing_file); | |
313 | } else { | |
314 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
315 | } | |
316 | } | |
317 | ||
5efa9d5a | 318 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 319 | { |
8c5873d6 SH |
320 | /* Block drivers without coroutine functions need emulation */ |
321 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
322 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
323 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
324 | ||
f8c35c1d SH |
325 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
326 | * the block driver lacks aio we need to emulate that too. | |
327 | */ | |
f9f05dc5 KW |
328 | if (!bdrv->bdrv_aio_readv) { |
329 | /* add AIO emulation layer */ | |
330 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
331 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 332 | } |
83f64091 | 333 | } |
b2e12bc6 | 334 | |
8a22f02a | 335 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 336 | } |
b338082b FB |
337 | |
338 | /* create a new block device (by default it is empty) */ | |
e4e9986b | 339 | BlockDriverState *bdrv_new_root(const char *device_name, Error **errp) |
b338082b | 340 | { |
1b7bdbc1 | 341 | BlockDriverState *bs; |
e4e9986b MA |
342 | |
343 | assert(*device_name); | |
b338082b | 344 | |
f5bebbbb | 345 | if (*device_name && !id_wellformed(device_name)) { |
9aebf3b8 KW |
346 | error_setg(errp, "Invalid device name"); |
347 | return NULL; | |
348 | } | |
349 | ||
f2d953ec KW |
350 | if (bdrv_find(device_name)) { |
351 | error_setg(errp, "Device with id '%s' already exists", | |
352 | device_name); | |
353 | return NULL; | |
354 | } | |
355 | if (bdrv_find_node(device_name)) { | |
d224469d MA |
356 | error_setg(errp, |
357 | "Device name '%s' conflicts with an existing node name", | |
f2d953ec KW |
358 | device_name); |
359 | return NULL; | |
360 | } | |
361 | ||
e4e9986b MA |
362 | bs = bdrv_new(); |
363 | ||
364 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
365 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); | |
366 | ||
367 | return bs; | |
368 | } | |
369 | ||
370 | BlockDriverState *bdrv_new(void) | |
371 | { | |
372 | BlockDriverState *bs; | |
373 | int i; | |
374 | ||
5839e53b | 375 | bs = g_new0(BlockDriverState, 1); |
e4654d2d | 376 | QLIST_INIT(&bs->dirty_bitmaps); |
fbe40ff7 FZ |
377 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
378 | QLIST_INIT(&bs->op_blockers[i]); | |
379 | } | |
28a7282a | 380 | bdrv_iostatus_disable(bs); |
d7d512f6 | 381 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 382 | notifier_with_return_list_init(&bs->before_write_notifiers); |
cc0681c4 BC |
383 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
384 | qemu_co_queue_init(&bs->throttled_reqs[1]); | |
9fcb0251 | 385 | bs->refcnt = 1; |
dcd04228 | 386 | bs->aio_context = qemu_get_aio_context(); |
d7d512f6 | 387 | |
b338082b FB |
388 | return bs; |
389 | } | |
390 | ||
d7d512f6 PB |
391 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
392 | { | |
393 | notifier_list_add(&bs->close_notifiers, notify); | |
394 | } | |
395 | ||
ea2384d3 FB |
396 | BlockDriver *bdrv_find_format(const char *format_name) |
397 | { | |
398 | BlockDriver *drv1; | |
8a22f02a SH |
399 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
400 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 401 | return drv1; |
8a22f02a | 402 | } |
ea2384d3 FB |
403 | } |
404 | return NULL; | |
405 | } | |
406 | ||
b64ec4e4 | 407 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 408 | { |
b64ec4e4 FZ |
409 | static const char *whitelist_rw[] = { |
410 | CONFIG_BDRV_RW_WHITELIST | |
411 | }; | |
412 | static const char *whitelist_ro[] = { | |
413 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
414 | }; |
415 | const char **p; | |
416 | ||
b64ec4e4 | 417 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 418 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 419 | } |
eb852011 | 420 | |
b64ec4e4 | 421 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
422 | if (!strcmp(drv->format_name, *p)) { |
423 | return 1; | |
424 | } | |
425 | } | |
b64ec4e4 FZ |
426 | if (read_only) { |
427 | for (p = whitelist_ro; *p; p++) { | |
428 | if (!strcmp(drv->format_name, *p)) { | |
429 | return 1; | |
430 | } | |
431 | } | |
432 | } | |
eb852011 MA |
433 | return 0; |
434 | } | |
435 | ||
b64ec4e4 FZ |
436 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
437 | bool read_only) | |
eb852011 MA |
438 | { |
439 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 440 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
441 | } |
442 | ||
5b7e1542 ZYW |
443 | typedef struct CreateCo { |
444 | BlockDriver *drv; | |
445 | char *filename; | |
83d0521a | 446 | QemuOpts *opts; |
5b7e1542 | 447 | int ret; |
cc84d90f | 448 | Error *err; |
5b7e1542 ZYW |
449 | } CreateCo; |
450 | ||
451 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
452 | { | |
cc84d90f HR |
453 | Error *local_err = NULL; |
454 | int ret; | |
455 | ||
5b7e1542 ZYW |
456 | CreateCo *cco = opaque; |
457 | assert(cco->drv); | |
458 | ||
c282e1fd | 459 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
84d18f06 | 460 | if (local_err) { |
cc84d90f HR |
461 | error_propagate(&cco->err, local_err); |
462 | } | |
463 | cco->ret = ret; | |
5b7e1542 ZYW |
464 | } |
465 | ||
0e7e1989 | 466 | int bdrv_create(BlockDriver *drv, const char* filename, |
83d0521a | 467 | QemuOpts *opts, Error **errp) |
ea2384d3 | 468 | { |
5b7e1542 ZYW |
469 | int ret; |
470 | ||
471 | Coroutine *co; | |
472 | CreateCo cco = { | |
473 | .drv = drv, | |
474 | .filename = g_strdup(filename), | |
83d0521a | 475 | .opts = opts, |
5b7e1542 | 476 | .ret = NOT_DONE, |
cc84d90f | 477 | .err = NULL, |
5b7e1542 ZYW |
478 | }; |
479 | ||
c282e1fd | 480 | if (!drv->bdrv_create) { |
cc84d90f | 481 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
80168bff LC |
482 | ret = -ENOTSUP; |
483 | goto out; | |
5b7e1542 ZYW |
484 | } |
485 | ||
486 | if (qemu_in_coroutine()) { | |
487 | /* Fast-path if already in coroutine context */ | |
488 | bdrv_create_co_entry(&cco); | |
489 | } else { | |
490 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
491 | qemu_coroutine_enter(co, &cco); | |
492 | while (cco.ret == NOT_DONE) { | |
b47ec2c4 | 493 | aio_poll(qemu_get_aio_context(), true); |
5b7e1542 ZYW |
494 | } |
495 | } | |
496 | ||
497 | ret = cco.ret; | |
cc84d90f | 498 | if (ret < 0) { |
84d18f06 | 499 | if (cco.err) { |
cc84d90f HR |
500 | error_propagate(errp, cco.err); |
501 | } else { | |
502 | error_setg_errno(errp, -ret, "Could not create image"); | |
503 | } | |
504 | } | |
0e7e1989 | 505 | |
80168bff LC |
506 | out: |
507 | g_free(cco.filename); | |
5b7e1542 | 508 | return ret; |
ea2384d3 FB |
509 | } |
510 | ||
c282e1fd | 511 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
84a12e66 CH |
512 | { |
513 | BlockDriver *drv; | |
cc84d90f HR |
514 | Error *local_err = NULL; |
515 | int ret; | |
84a12e66 | 516 | |
98289620 | 517 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 518 | if (drv == NULL) { |
cc84d90f | 519 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
16905d71 | 520 | return -ENOENT; |
84a12e66 CH |
521 | } |
522 | ||
c282e1fd | 523 | ret = bdrv_create(drv, filename, opts, &local_err); |
84d18f06 | 524 | if (local_err) { |
cc84d90f HR |
525 | error_propagate(errp, local_err); |
526 | } | |
527 | return ret; | |
84a12e66 CH |
528 | } |
529 | ||
3baca891 | 530 | void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd KW |
531 | { |
532 | BlockDriver *drv = bs->drv; | |
3baca891 | 533 | Error *local_err = NULL; |
d34682cd KW |
534 | |
535 | memset(&bs->bl, 0, sizeof(bs->bl)); | |
536 | ||
466ad822 | 537 | if (!drv) { |
3baca891 | 538 | return; |
466ad822 KW |
539 | } |
540 | ||
541 | /* Take some limits from the children as a default */ | |
542 | if (bs->file) { | |
3baca891 KW |
543 | bdrv_refresh_limits(bs->file, &local_err); |
544 | if (local_err) { | |
545 | error_propagate(errp, local_err); | |
546 | return; | |
547 | } | |
466ad822 | 548 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
339064d5 KW |
549 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
550 | } else { | |
551 | bs->bl.opt_mem_alignment = 512; | |
466ad822 KW |
552 | } |
553 | ||
554 | if (bs->backing_hd) { | |
3baca891 KW |
555 | bdrv_refresh_limits(bs->backing_hd, &local_err); |
556 | if (local_err) { | |
557 | error_propagate(errp, local_err); | |
558 | return; | |
559 | } | |
466ad822 KW |
560 | bs->bl.opt_transfer_length = |
561 | MAX(bs->bl.opt_transfer_length, | |
562 | bs->backing_hd->bl.opt_transfer_length); | |
339064d5 KW |
563 | bs->bl.opt_mem_alignment = |
564 | MAX(bs->bl.opt_mem_alignment, | |
565 | bs->backing_hd->bl.opt_mem_alignment); | |
466ad822 KW |
566 | } |
567 | ||
568 | /* Then let the driver override it */ | |
569 | if (drv->bdrv_refresh_limits) { | |
3baca891 | 570 | drv->bdrv_refresh_limits(bs, errp); |
d34682cd | 571 | } |
d34682cd KW |
572 | } |
573 | ||
eba25057 JM |
574 | /* |
575 | * Create a uniquely-named empty temporary file. | |
576 | * Return 0 upon success, otherwise a negative errno value. | |
577 | */ | |
578 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 579 | { |
eba25057 | 580 | #ifdef _WIN32 |
3b9f94e1 | 581 | char temp_dir[MAX_PATH]; |
eba25057 JM |
582 | /* GetTempFileName requires that its output buffer (4th param) |
583 | have length MAX_PATH or greater. */ | |
584 | assert(size >= MAX_PATH); | |
585 | return (GetTempPath(MAX_PATH, temp_dir) | |
586 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
587 | ? 0 : -GetLastError()); | |
d5249393 | 588 | #else |
67b915a5 | 589 | int fd; |
7ccfb2eb | 590 | const char *tmpdir; |
0badc1ee | 591 | tmpdir = getenv("TMPDIR"); |
69bef793 AS |
592 | if (!tmpdir) { |
593 | tmpdir = "/var/tmp"; | |
594 | } | |
eba25057 JM |
595 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
596 | return -EOVERFLOW; | |
597 | } | |
ea2384d3 | 598 | fd = mkstemp(filename); |
fe235a06 DH |
599 | if (fd < 0) { |
600 | return -errno; | |
601 | } | |
602 | if (close(fd) != 0) { | |
603 | unlink(filename); | |
eba25057 JM |
604 | return -errno; |
605 | } | |
606 | return 0; | |
d5249393 | 607 | #endif |
eba25057 | 608 | } |
fc01f7e7 | 609 | |
84a12e66 CH |
610 | /* |
611 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
612 | * recognized as a host CDROM. | |
613 | */ | |
614 | static BlockDriver *find_hdev_driver(const char *filename) | |
615 | { | |
616 | int score_max = 0, score; | |
617 | BlockDriver *drv = NULL, *d; | |
618 | ||
619 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
620 | if (d->bdrv_probe_device) { | |
621 | score = d->bdrv_probe_device(filename); | |
622 | if (score > score_max) { | |
623 | score_max = score; | |
624 | drv = d; | |
625 | } | |
626 | } | |
627 | } | |
628 | ||
629 | return drv; | |
630 | } | |
631 | ||
98289620 KW |
632 | BlockDriver *bdrv_find_protocol(const char *filename, |
633 | bool allow_protocol_prefix) | |
83f64091 FB |
634 | { |
635 | BlockDriver *drv1; | |
636 | char protocol[128]; | |
1cec71e3 | 637 | int len; |
83f64091 | 638 | const char *p; |
19cb3738 | 639 | |
66f82cee KW |
640 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
641 | ||
39508e7a CH |
642 | /* |
643 | * XXX(hch): we really should not let host device detection | |
644 | * override an explicit protocol specification, but moving this | |
645 | * later breaks access to device names with colons in them. | |
646 | * Thanks to the brain-dead persistent naming schemes on udev- | |
647 | * based Linux systems those actually are quite common. | |
648 | */ | |
649 | drv1 = find_hdev_driver(filename); | |
650 | if (drv1) { | |
651 | return drv1; | |
652 | } | |
653 | ||
98289620 | 654 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 655 | return bdrv_find_format("file"); |
84a12e66 | 656 | } |
98289620 | 657 | |
9e0b22f4 SH |
658 | p = strchr(filename, ':'); |
659 | assert(p != NULL); | |
1cec71e3 AL |
660 | len = p - filename; |
661 | if (len > sizeof(protocol) - 1) | |
662 | len = sizeof(protocol) - 1; | |
663 | memcpy(protocol, filename, len); | |
664 | protocol[len] = '\0'; | |
8a22f02a | 665 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 666 | if (drv1->protocol_name && |
8a22f02a | 667 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 668 | return drv1; |
8a22f02a | 669 | } |
83f64091 FB |
670 | } |
671 | return NULL; | |
672 | } | |
673 | ||
f500a6d3 | 674 | static int find_image_format(BlockDriverState *bs, const char *filename, |
34b5d2c6 | 675 | BlockDriver **pdrv, Error **errp) |
f3a5d3f8 | 676 | { |
f500a6d3 | 677 | int score, score_max; |
f3a5d3f8 CH |
678 | BlockDriver *drv1, *drv; |
679 | uint8_t buf[2048]; | |
f500a6d3 | 680 | int ret = 0; |
f8ea0b00 | 681 | |
08a00559 | 682 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 683 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
684 | drv = bdrv_find_format("raw"); |
685 | if (!drv) { | |
34b5d2c6 | 686 | error_setg(errp, "Could not find raw image format"); |
c98ac35d SW |
687 | ret = -ENOENT; |
688 | } | |
689 | *pdrv = drv; | |
690 | return ret; | |
1a396859 | 691 | } |
f8ea0b00 | 692 | |
83f64091 | 693 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 694 | if (ret < 0) { |
34b5d2c6 HR |
695 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
696 | "format"); | |
c98ac35d SW |
697 | *pdrv = NULL; |
698 | return ret; | |
83f64091 FB |
699 | } |
700 | ||
ea2384d3 | 701 | score_max = 0; |
84a12e66 | 702 | drv = NULL; |
8a22f02a | 703 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
704 | if (drv1->bdrv_probe) { |
705 | score = drv1->bdrv_probe(buf, ret, filename); | |
706 | if (score > score_max) { | |
707 | score_max = score; | |
708 | drv = drv1; | |
709 | } | |
0849bf08 | 710 | } |
fc01f7e7 | 711 | } |
c98ac35d | 712 | if (!drv) { |
34b5d2c6 HR |
713 | error_setg(errp, "Could not determine image format: No compatible " |
714 | "driver found"); | |
c98ac35d SW |
715 | ret = -ENOENT; |
716 | } | |
717 | *pdrv = drv; | |
718 | return ret; | |
ea2384d3 FB |
719 | } |
720 | ||
51762288 SH |
721 | /** |
722 | * Set the current 'total_sectors' value | |
65a9bb25 | 723 | * Return 0 on success, -errno on error. |
51762288 SH |
724 | */ |
725 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
726 | { | |
727 | BlockDriver *drv = bs->drv; | |
728 | ||
396759ad NB |
729 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
730 | if (bs->sg) | |
731 | return 0; | |
732 | ||
51762288 SH |
733 | /* query actual device if possible, otherwise just trust the hint */ |
734 | if (drv->bdrv_getlength) { | |
735 | int64_t length = drv->bdrv_getlength(bs); | |
736 | if (length < 0) { | |
737 | return length; | |
738 | } | |
7e382003 | 739 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
51762288 SH |
740 | } |
741 | ||
742 | bs->total_sectors = hint; | |
743 | return 0; | |
744 | } | |
745 | ||
9e8f1835 PB |
746 | /** |
747 | * Set open flags for a given discard mode | |
748 | * | |
749 | * Return 0 on success, -1 if the discard mode was invalid. | |
750 | */ | |
751 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
752 | { | |
753 | *flags &= ~BDRV_O_UNMAP; | |
754 | ||
755 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
756 | /* do nothing */ | |
757 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
758 | *flags |= BDRV_O_UNMAP; | |
759 | } else { | |
760 | return -1; | |
761 | } | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
c3993cdc SH |
766 | /** |
767 | * Set open flags for a given cache mode | |
768 | * | |
769 | * Return 0 on success, -1 if the cache mode was invalid. | |
770 | */ | |
771 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
772 | { | |
773 | *flags &= ~BDRV_O_CACHE_MASK; | |
774 | ||
775 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
776 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
777 | } else if (!strcmp(mode, "directsync")) { |
778 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
779 | } else if (!strcmp(mode, "writeback")) { |
780 | *flags |= BDRV_O_CACHE_WB; | |
781 | } else if (!strcmp(mode, "unsafe")) { | |
782 | *flags |= BDRV_O_CACHE_WB; | |
783 | *flags |= BDRV_O_NO_FLUSH; | |
784 | } else if (!strcmp(mode, "writethrough")) { | |
785 | /* this is the default */ | |
786 | } else { | |
787 | return -1; | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
53fec9d3 SH |
793 | /** |
794 | * The copy-on-read flag is actually a reference count so multiple users may | |
795 | * use the feature without worrying about clobbering its previous state. | |
796 | * Copy-on-read stays enabled until all users have called to disable it. | |
797 | */ | |
798 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
799 | { | |
800 | bs->copy_on_read++; | |
801 | } | |
802 | ||
803 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
804 | { | |
805 | assert(bs->copy_on_read > 0); | |
806 | bs->copy_on_read--; | |
807 | } | |
808 | ||
b1e6fc08 KW |
809 | /* |
810 | * Returns the flags that a temporary snapshot should get, based on the | |
811 | * originally requested flags (the originally requested image will have flags | |
812 | * like a backing file) | |
813 | */ | |
814 | static int bdrv_temp_snapshot_flags(int flags) | |
815 | { | |
816 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; | |
817 | } | |
818 | ||
0b50cc88 KW |
819 | /* |
820 | * Returns the flags that bs->file should get, based on the given flags for | |
821 | * the parent BDS | |
822 | */ | |
823 | static int bdrv_inherited_flags(int flags) | |
824 | { | |
825 | /* Enable protocol handling, disable format probing for bs->file */ | |
826 | flags |= BDRV_O_PROTOCOL; | |
827 | ||
828 | /* Our block drivers take care to send flushes and respect unmap policy, | |
829 | * so we can enable both unconditionally on lower layers. */ | |
830 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; | |
831 | ||
0b50cc88 | 832 | /* Clear flags that only apply to the top layer */ |
5669b44d | 833 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
0b50cc88 KW |
834 | |
835 | return flags; | |
836 | } | |
837 | ||
317fc44e KW |
838 | /* |
839 | * Returns the flags that bs->backing_hd should get, based on the given flags | |
840 | * for the parent BDS | |
841 | */ | |
842 | static int bdrv_backing_flags(int flags) | |
843 | { | |
844 | /* backing files always opened read-only */ | |
845 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); | |
846 | ||
847 | /* snapshot=on is handled on the top layer */ | |
8bfea15d | 848 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
317fc44e KW |
849 | |
850 | return flags; | |
851 | } | |
852 | ||
7b272452 KW |
853 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
854 | { | |
855 | int open_flags = flags | BDRV_O_CACHE_WB; | |
856 | ||
857 | /* | |
858 | * Clear flags that are internal to the block layer before opening the | |
859 | * image. | |
860 | */ | |
20cca275 | 861 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
7b272452 KW |
862 | |
863 | /* | |
864 | * Snapshots should be writable. | |
865 | */ | |
8bfea15d | 866 | if (flags & BDRV_O_TEMPORARY) { |
7b272452 KW |
867 | open_flags |= BDRV_O_RDWR; |
868 | } | |
869 | ||
870 | return open_flags; | |
871 | } | |
872 | ||
636ea370 KW |
873 | static void bdrv_assign_node_name(BlockDriverState *bs, |
874 | const char *node_name, | |
875 | Error **errp) | |
6913c0c2 BC |
876 | { |
877 | if (!node_name) { | |
636ea370 | 878 | return; |
6913c0c2 BC |
879 | } |
880 | ||
9aebf3b8 | 881 | /* Check for empty string or invalid characters */ |
f5bebbbb | 882 | if (!id_wellformed(node_name)) { |
9aebf3b8 | 883 | error_setg(errp, "Invalid node name"); |
636ea370 | 884 | return; |
6913c0c2 BC |
885 | } |
886 | ||
0c5e94ee BC |
887 | /* takes care of avoiding namespaces collisions */ |
888 | if (bdrv_find(node_name)) { | |
889 | error_setg(errp, "node-name=%s is conflicting with a device id", | |
890 | node_name); | |
636ea370 | 891 | return; |
0c5e94ee BC |
892 | } |
893 | ||
6913c0c2 BC |
894 | /* takes care of avoiding duplicates node names */ |
895 | if (bdrv_find_node(node_name)) { | |
896 | error_setg(errp, "Duplicate node name"); | |
636ea370 | 897 | return; |
6913c0c2 BC |
898 | } |
899 | ||
900 | /* copy node name into the bs and insert it into the graph list */ | |
901 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); | |
902 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); | |
6913c0c2 BC |
903 | } |
904 | ||
57915332 KW |
905 | /* |
906 | * Common part for opening disk images and files | |
b6ad491a KW |
907 | * |
908 | * Removes all processed options from *options. | |
57915332 | 909 | */ |
f500a6d3 | 910 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
34b5d2c6 | 911 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
57915332 KW |
912 | { |
913 | int ret, open_flags; | |
035fccdf | 914 | const char *filename; |
6913c0c2 | 915 | const char *node_name = NULL; |
34b5d2c6 | 916 | Error *local_err = NULL; |
57915332 KW |
917 | |
918 | assert(drv != NULL); | |
6405875c | 919 | assert(bs->file == NULL); |
707ff828 | 920 | assert(options != NULL && bs->options != options); |
57915332 | 921 | |
45673671 KW |
922 | if (file != NULL) { |
923 | filename = file->filename; | |
924 | } else { | |
925 | filename = qdict_get_try_str(options, "filename"); | |
926 | } | |
927 | ||
765003db KW |
928 | if (drv->bdrv_needs_filename && !filename) { |
929 | error_setg(errp, "The '%s' block driver requires a file name", | |
930 | drv->format_name); | |
931 | return -EINVAL; | |
932 | } | |
933 | ||
45673671 | 934 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
28dcee10 | 935 | |
6913c0c2 | 936 | node_name = qdict_get_try_str(options, "node-name"); |
636ea370 | 937 | bdrv_assign_node_name(bs, node_name, &local_err); |
0fb6395c | 938 | if (local_err) { |
636ea370 KW |
939 | error_propagate(errp, local_err); |
940 | return -EINVAL; | |
6913c0c2 BC |
941 | } |
942 | qdict_del(options, "node-name"); | |
943 | ||
5d186eb0 KW |
944 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
945 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
946 | * and return immediately. */ | |
947 | if (file != NULL && drv->bdrv_file_open) { | |
948 | bdrv_swap(file, bs); | |
949 | return 0; | |
950 | } | |
951 | ||
57915332 | 952 | bs->open_flags = flags; |
1b7fd729 | 953 | bs->guest_block_size = 512; |
c25f53b0 | 954 | bs->request_alignment = 512; |
0d51b4de | 955 | bs->zero_beyond_eof = true; |
b64ec4e4 FZ |
956 | open_flags = bdrv_open_flags(bs, flags); |
957 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
20cca275 | 958 | bs->growable = !!(flags & BDRV_O_PROTOCOL); |
b64ec4e4 FZ |
959 | |
960 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
8f94a6e4 KW |
961 | error_setg(errp, |
962 | !bs->read_only && bdrv_is_whitelisted(drv, true) | |
963 | ? "Driver '%s' can only be used for read-only devices" | |
964 | : "Driver '%s' is not whitelisted", | |
965 | drv->format_name); | |
b64ec4e4 FZ |
966 | return -ENOTSUP; |
967 | } | |
57915332 | 968 | |
53fec9d3 | 969 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
0ebd24e0 KW |
970 | if (flags & BDRV_O_COPY_ON_READ) { |
971 | if (!bs->read_only) { | |
972 | bdrv_enable_copy_on_read(bs); | |
973 | } else { | |
974 | error_setg(errp, "Can't use copy-on-read on read-only device"); | |
975 | return -EINVAL; | |
976 | } | |
53fec9d3 SH |
977 | } |
978 | ||
c2ad1b0c KW |
979 | if (filename != NULL) { |
980 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
981 | } else { | |
982 | bs->filename[0] = '\0'; | |
983 | } | |
91af7014 | 984 | pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), bs->filename); |
57915332 | 985 | |
57915332 | 986 | bs->drv = drv; |
7267c094 | 987 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 988 | |
03f541bd | 989 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 990 | |
66f82cee KW |
991 | /* Open the image, either directly or using a protocol */ |
992 | if (drv->bdrv_file_open) { | |
5d186eb0 | 993 | assert(file == NULL); |
030be321 | 994 | assert(!drv->bdrv_needs_filename || filename != NULL); |
34b5d2c6 | 995 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
f500a6d3 | 996 | } else { |
2af5ef70 | 997 | if (file == NULL) { |
34b5d2c6 HR |
998 | error_setg(errp, "Can't use '%s' as a block driver for the " |
999 | "protocol level", drv->format_name); | |
2af5ef70 KW |
1000 | ret = -EINVAL; |
1001 | goto free_and_fail; | |
1002 | } | |
f500a6d3 | 1003 | bs->file = file; |
34b5d2c6 | 1004 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
66f82cee KW |
1005 | } |
1006 | ||
57915332 | 1007 | if (ret < 0) { |
84d18f06 | 1008 | if (local_err) { |
34b5d2c6 | 1009 | error_propagate(errp, local_err); |
2fa9aa59 DH |
1010 | } else if (bs->filename[0]) { |
1011 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); | |
34b5d2c6 HR |
1012 | } else { |
1013 | error_setg_errno(errp, -ret, "Could not open image"); | |
1014 | } | |
57915332 KW |
1015 | goto free_and_fail; |
1016 | } | |
1017 | ||
51762288 SH |
1018 | ret = refresh_total_sectors(bs, bs->total_sectors); |
1019 | if (ret < 0) { | |
34b5d2c6 | 1020 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
51762288 | 1021 | goto free_and_fail; |
57915332 | 1022 | } |
51762288 | 1023 | |
3baca891 KW |
1024 | bdrv_refresh_limits(bs, &local_err); |
1025 | if (local_err) { | |
1026 | error_propagate(errp, local_err); | |
1027 | ret = -EINVAL; | |
1028 | goto free_and_fail; | |
1029 | } | |
1030 | ||
c25f53b0 | 1031 | assert(bdrv_opt_mem_align(bs) != 0); |
47ea2de2 | 1032 | assert((bs->request_alignment != 0) || bs->sg); |
57915332 KW |
1033 | return 0; |
1034 | ||
1035 | free_and_fail: | |
f500a6d3 | 1036 | bs->file = NULL; |
7267c094 | 1037 | g_free(bs->opaque); |
57915332 KW |
1038 | bs->opaque = NULL; |
1039 | bs->drv = NULL; | |
1040 | return ret; | |
1041 | } | |
1042 | ||
5e5c4f63 KW |
1043 | static QDict *parse_json_filename(const char *filename, Error **errp) |
1044 | { | |
1045 | QObject *options_obj; | |
1046 | QDict *options; | |
1047 | int ret; | |
1048 | ||
1049 | ret = strstart(filename, "json:", &filename); | |
1050 | assert(ret); | |
1051 | ||
1052 | options_obj = qobject_from_json(filename); | |
1053 | if (!options_obj) { | |
1054 | error_setg(errp, "Could not parse the JSON options"); | |
1055 | return NULL; | |
1056 | } | |
1057 | ||
1058 | if (qobject_type(options_obj) != QTYPE_QDICT) { | |
1059 | qobject_decref(options_obj); | |
1060 | error_setg(errp, "Invalid JSON object given"); | |
1061 | return NULL; | |
1062 | } | |
1063 | ||
1064 | options = qobject_to_qdict(options_obj); | |
1065 | qdict_flatten(options); | |
1066 | ||
1067 | return options; | |
1068 | } | |
1069 | ||
b6ce07aa | 1070 | /* |
f54120ff KW |
1071 | * Fills in default options for opening images and converts the legacy |
1072 | * filename/flags pair to option QDict entries. | |
b6ce07aa | 1073 | */ |
5e5c4f63 | 1074 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
17b005f1 | 1075 | BlockDriver *drv, Error **errp) |
ea2384d3 | 1076 | { |
5e5c4f63 | 1077 | const char *filename = *pfilename; |
c2ad1b0c | 1078 | const char *drvname; |
462f5bcf | 1079 | bool protocol = flags & BDRV_O_PROTOCOL; |
e3fa4bfa | 1080 | bool parse_filename = false; |
34b5d2c6 | 1081 | Error *local_err = NULL; |
83f64091 | 1082 | |
5e5c4f63 KW |
1083 | /* Parse json: pseudo-protocol */ |
1084 | if (filename && g_str_has_prefix(filename, "json:")) { | |
1085 | QDict *json_options = parse_json_filename(filename, &local_err); | |
1086 | if (local_err) { | |
1087 | error_propagate(errp, local_err); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | ||
1091 | /* Options given in the filename have lower priority than options | |
1092 | * specified directly */ | |
1093 | qdict_join(*options, json_options, false); | |
1094 | QDECREF(json_options); | |
1095 | *pfilename = filename = NULL; | |
1096 | } | |
1097 | ||
035fccdf | 1098 | /* Fetch the file name from the options QDict if necessary */ |
17b005f1 | 1099 | if (protocol && filename) { |
f54120ff KW |
1100 | if (!qdict_haskey(*options, "filename")) { |
1101 | qdict_put(*options, "filename", qstring_from_str(filename)); | |
1102 | parse_filename = true; | |
1103 | } else { | |
1104 | error_setg(errp, "Can't specify 'file' and 'filename' options at " | |
1105 | "the same time"); | |
1106 | return -EINVAL; | |
1107 | } | |
035fccdf KW |
1108 | } |
1109 | ||
c2ad1b0c | 1110 | /* Find the right block driver */ |
f54120ff | 1111 | filename = qdict_get_try_str(*options, "filename"); |
5acd9d81 | 1112 | drvname = qdict_get_try_str(*options, "driver"); |
f54120ff | 1113 | |
17b005f1 KW |
1114 | if (drv) { |
1115 | if (drvname) { | |
1116 | error_setg(errp, "Driver specified twice"); | |
1117 | return -EINVAL; | |
1118 | } | |
1119 | drvname = drv->format_name; | |
1120 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1121 | } else { | |
1122 | if (!drvname && protocol) { | |
1123 | if (filename) { | |
1124 | drv = bdrv_find_protocol(filename, parse_filename); | |
1125 | if (!drv) { | |
1126 | error_setg(errp, "Unknown protocol"); | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | ||
1130 | drvname = drv->format_name; | |
1131 | qdict_put(*options, "driver", qstring_from_str(drvname)); | |
1132 | } else { | |
1133 | error_setg(errp, "Must specify either driver or file"); | |
f54120ff KW |
1134 | return -EINVAL; |
1135 | } | |
17b005f1 KW |
1136 | } else if (drvname) { |
1137 | drv = bdrv_find_format(drvname); | |
1138 | if (!drv) { | |
1139 | error_setg(errp, "Unknown driver '%s'", drvname); | |
1140 | return -ENOENT; | |
1141 | } | |
98289620 | 1142 | } |
c2ad1b0c KW |
1143 | } |
1144 | ||
17b005f1 | 1145 | assert(drv || !protocol); |
c2ad1b0c | 1146 | |
f54120ff | 1147 | /* Driver-specific filename parsing */ |
17b005f1 | 1148 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
5acd9d81 | 1149 | drv->bdrv_parse_filename(filename, *options, &local_err); |
84d18f06 | 1150 | if (local_err) { |
34b5d2c6 | 1151 | error_propagate(errp, local_err); |
f54120ff | 1152 | return -EINVAL; |
6963a30d | 1153 | } |
cd5d031e HR |
1154 | |
1155 | if (!drv->bdrv_needs_filename) { | |
1156 | qdict_del(*options, "filename"); | |
cd5d031e | 1157 | } |
6963a30d KW |
1158 | } |
1159 | ||
f54120ff KW |
1160 | return 0; |
1161 | } | |
1162 | ||
8d24cce1 FZ |
1163 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
1164 | { | |
1165 | ||
826b6ca0 FZ |
1166 | if (bs->backing_hd) { |
1167 | assert(bs->backing_blocker); | |
1168 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); | |
1169 | } else if (backing_hd) { | |
1170 | error_setg(&bs->backing_blocker, | |
1171 | "device is used as backing hd of '%s'", | |
1172 | bs->device_name); | |
1173 | } | |
1174 | ||
8d24cce1 FZ |
1175 | bs->backing_hd = backing_hd; |
1176 | if (!backing_hd) { | |
826b6ca0 FZ |
1177 | error_free(bs->backing_blocker); |
1178 | bs->backing_blocker = NULL; | |
8d24cce1 FZ |
1179 | goto out; |
1180 | } | |
1181 | bs->open_flags &= ~BDRV_O_NO_BACKING; | |
1182 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); | |
1183 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), | |
1184 | backing_hd->drv ? backing_hd->drv->format_name : ""); | |
826b6ca0 FZ |
1185 | |
1186 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); | |
1187 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ | |
1188 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, | |
1189 | bs->backing_blocker); | |
8d24cce1 | 1190 | out: |
3baca891 | 1191 | bdrv_refresh_limits(bs, NULL); |
8d24cce1 FZ |
1192 | } |
1193 | ||
31ca6d07 KW |
1194 | /* |
1195 | * Opens the backing file for a BlockDriverState if not yet open | |
1196 | * | |
1197 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1198 | * empty set of options. The reference to the QDict is transferred to this | |
1199 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
1200 | * it needs to use QINCREF() before calling bdrv_file_open. | |
1201 | */ | |
34b5d2c6 | 1202 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
9156df12 | 1203 | { |
1ba4b6a5 | 1204 | char *backing_filename = g_malloc0(PATH_MAX); |
317fc44e | 1205 | int ret = 0; |
9156df12 | 1206 | BlockDriver *back_drv = NULL; |
8d24cce1 | 1207 | BlockDriverState *backing_hd; |
34b5d2c6 | 1208 | Error *local_err = NULL; |
9156df12 PB |
1209 | |
1210 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 1211 | QDECREF(options); |
1ba4b6a5 | 1212 | goto free_exit; |
9156df12 PB |
1213 | } |
1214 | ||
31ca6d07 KW |
1215 | /* NULL means an empty set of options */ |
1216 | if (options == NULL) { | |
1217 | options = qdict_new(); | |
1218 | } | |
1219 | ||
9156df12 | 1220 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
1221 | if (qdict_haskey(options, "file.filename")) { |
1222 | backing_filename[0] = '\0'; | |
1223 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 1224 | QDECREF(options); |
1ba4b6a5 | 1225 | goto free_exit; |
dbecebdd | 1226 | } else { |
1ba4b6a5 | 1227 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX); |
9156df12 PB |
1228 | } |
1229 | ||
8ee79e70 KW |
1230 | if (!bs->drv || !bs->drv->supports_backing) { |
1231 | ret = -EINVAL; | |
1232 | error_setg(errp, "Driver doesn't support backing files"); | |
1233 | QDECREF(options); | |
1234 | goto free_exit; | |
1235 | } | |
1236 | ||
e4e9986b | 1237 | backing_hd = bdrv_new(); |
8d24cce1 | 1238 | |
9156df12 PB |
1239 | if (bs->backing_format[0] != '\0') { |
1240 | back_drv = bdrv_find_format(bs->backing_format); | |
1241 | } | |
1242 | ||
f67503e5 | 1243 | assert(bs->backing_hd == NULL); |
8d24cce1 | 1244 | ret = bdrv_open(&backing_hd, |
ddf5636d | 1245 | *backing_filename ? backing_filename : NULL, NULL, options, |
317fc44e | 1246 | bdrv_backing_flags(bs->open_flags), back_drv, &local_err); |
9156df12 | 1247 | if (ret < 0) { |
8d24cce1 FZ |
1248 | bdrv_unref(backing_hd); |
1249 | backing_hd = NULL; | |
9156df12 | 1250 | bs->open_flags |= BDRV_O_NO_BACKING; |
b04b6b6e FZ |
1251 | error_setg(errp, "Could not open backing file: %s", |
1252 | error_get_pretty(local_err)); | |
1253 | error_free(local_err); | |
1ba4b6a5 | 1254 | goto free_exit; |
9156df12 | 1255 | } |
8d24cce1 | 1256 | bdrv_set_backing_hd(bs, backing_hd); |
d80ac658 | 1257 | |
1ba4b6a5 BC |
1258 | free_exit: |
1259 | g_free(backing_filename); | |
1260 | return ret; | |
9156df12 PB |
1261 | } |
1262 | ||
da557aac HR |
1263 | /* |
1264 | * Opens a disk image whose options are given as BlockdevRef in another block | |
1265 | * device's options. | |
1266 | * | |
da557aac HR |
1267 | * If allow_none is true, no image will be opened if filename is false and no |
1268 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. | |
1269 | * | |
1270 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. | |
1271 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict | |
1272 | * itself, all options starting with "${bdref_key}." are considered part of the | |
1273 | * BlockdevRef. | |
1274 | * | |
1275 | * The BlockdevRef will be removed from the options QDict. | |
f67503e5 HR |
1276 | * |
1277 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. | |
da557aac HR |
1278 | */ |
1279 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, | |
1280 | QDict *options, const char *bdref_key, int flags, | |
f7d9fd8c | 1281 | bool allow_none, Error **errp) |
da557aac HR |
1282 | { |
1283 | QDict *image_options; | |
1284 | int ret; | |
1285 | char *bdref_key_dot; | |
1286 | const char *reference; | |
1287 | ||
f67503e5 HR |
1288 | assert(pbs); |
1289 | assert(*pbs == NULL); | |
1290 | ||
da557aac HR |
1291 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
1292 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); | |
1293 | g_free(bdref_key_dot); | |
1294 | ||
1295 | reference = qdict_get_try_str(options, bdref_key); | |
1296 | if (!filename && !reference && !qdict_size(image_options)) { | |
1297 | if (allow_none) { | |
1298 | ret = 0; | |
1299 | } else { | |
1300 | error_setg(errp, "A block device must be specified for \"%s\"", | |
1301 | bdref_key); | |
1302 | ret = -EINVAL; | |
1303 | } | |
b20e61e0 | 1304 | QDECREF(image_options); |
da557aac HR |
1305 | goto done; |
1306 | } | |
1307 | ||
f7d9fd8c | 1308 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
da557aac HR |
1309 | |
1310 | done: | |
1311 | qdict_del(options, bdref_key); | |
1312 | return ret; | |
1313 | } | |
1314 | ||
6b8aeca5 | 1315 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
b998875d KW |
1316 | { |
1317 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ | |
1ba4b6a5 | 1318 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
b998875d KW |
1319 | int64_t total_size; |
1320 | BlockDriver *bdrv_qcow2; | |
83d0521a | 1321 | QemuOpts *opts = NULL; |
b998875d KW |
1322 | QDict *snapshot_options; |
1323 | BlockDriverState *bs_snapshot; | |
1324 | Error *local_err; | |
1325 | int ret; | |
1326 | ||
1327 | /* if snapshot, we create a temporary backing file and open it | |
1328 | instead of opening 'filename' directly */ | |
1329 | ||
1330 | /* Get the required size from the image */ | |
f187743a KW |
1331 | total_size = bdrv_getlength(bs); |
1332 | if (total_size < 0) { | |
6b8aeca5 | 1333 | ret = total_size; |
f187743a | 1334 | error_setg_errno(errp, -total_size, "Could not get image size"); |
1ba4b6a5 | 1335 | goto out; |
f187743a | 1336 | } |
b998875d KW |
1337 | |
1338 | /* Create the temporary image */ | |
1ba4b6a5 | 1339 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
b998875d KW |
1340 | if (ret < 0) { |
1341 | error_setg_errno(errp, -ret, "Could not get temporary filename"); | |
1ba4b6a5 | 1342 | goto out; |
b998875d KW |
1343 | } |
1344 | ||
1345 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
c282e1fd CL |
1346 | opts = qemu_opts_create(bdrv_qcow2->create_opts, NULL, 0, |
1347 | &error_abort); | |
83d0521a | 1348 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size); |
c282e1fd | 1349 | ret = bdrv_create(bdrv_qcow2, tmp_filename, opts, &local_err); |
83d0521a | 1350 | qemu_opts_del(opts); |
b998875d KW |
1351 | if (ret < 0) { |
1352 | error_setg_errno(errp, -ret, "Could not create temporary overlay " | |
1353 | "'%s': %s", tmp_filename, | |
1354 | error_get_pretty(local_err)); | |
1355 | error_free(local_err); | |
1ba4b6a5 | 1356 | goto out; |
b998875d KW |
1357 | } |
1358 | ||
1359 | /* Prepare a new options QDict for the temporary file */ | |
1360 | snapshot_options = qdict_new(); | |
1361 | qdict_put(snapshot_options, "file.driver", | |
1362 | qstring_from_str("file")); | |
1363 | qdict_put(snapshot_options, "file.filename", | |
1364 | qstring_from_str(tmp_filename)); | |
1365 | ||
e4e9986b | 1366 | bs_snapshot = bdrv_new(); |
b998875d KW |
1367 | |
1368 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, | |
b1e6fc08 | 1369 | flags, bdrv_qcow2, &local_err); |
b998875d KW |
1370 | if (ret < 0) { |
1371 | error_propagate(errp, local_err); | |
1ba4b6a5 | 1372 | goto out; |
b998875d KW |
1373 | } |
1374 | ||
1375 | bdrv_append(bs_snapshot, bs); | |
1ba4b6a5 BC |
1376 | |
1377 | out: | |
1378 | g_free(tmp_filename); | |
6b8aeca5 | 1379 | return ret; |
b998875d KW |
1380 | } |
1381 | ||
b6ce07aa KW |
1382 | /* |
1383 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
1384 | * |
1385 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
1386 | * empty set of options. The reference to the QDict belongs to the block layer | |
1387 | * after the call (even on failure), so if the caller intends to reuse the | |
1388 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
f67503e5 HR |
1389 | * |
1390 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. | |
1391 | * If it is not NULL, the referenced BDS will be reused. | |
ddf5636d HR |
1392 | * |
1393 | * The reference parameter may be used to specify an existing block device which | |
1394 | * should be opened. If specified, neither options nor a filename may be given, | |
1395 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). | |
b6ce07aa | 1396 | */ |
ddf5636d HR |
1397 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
1398 | const char *reference, QDict *options, int flags, | |
1399 | BlockDriver *drv, Error **errp) | |
ea2384d3 | 1400 | { |
b6ce07aa | 1401 | int ret; |
f67503e5 | 1402 | BlockDriverState *file = NULL, *bs; |
74fe54f2 | 1403 | const char *drvname; |
34b5d2c6 | 1404 | Error *local_err = NULL; |
b1e6fc08 | 1405 | int snapshot_flags = 0; |
712e7874 | 1406 | |
f67503e5 HR |
1407 | assert(pbs); |
1408 | ||
ddf5636d HR |
1409 | if (reference) { |
1410 | bool options_non_empty = options ? qdict_size(options) : false; | |
1411 | QDECREF(options); | |
1412 | ||
1413 | if (*pbs) { | |
1414 | error_setg(errp, "Cannot reuse an existing BDS when referencing " | |
1415 | "another block device"); | |
1416 | return -EINVAL; | |
1417 | } | |
1418 | ||
1419 | if (filename || options_non_empty) { | |
1420 | error_setg(errp, "Cannot reference an existing block device with " | |
1421 | "additional options or a new filename"); | |
1422 | return -EINVAL; | |
1423 | } | |
1424 | ||
1425 | bs = bdrv_lookup_bs(reference, reference, errp); | |
1426 | if (!bs) { | |
1427 | return -ENODEV; | |
1428 | } | |
1429 | bdrv_ref(bs); | |
1430 | *pbs = bs; | |
1431 | return 0; | |
1432 | } | |
1433 | ||
f67503e5 HR |
1434 | if (*pbs) { |
1435 | bs = *pbs; | |
1436 | } else { | |
e4e9986b | 1437 | bs = bdrv_new(); |
f67503e5 HR |
1438 | } |
1439 | ||
de9c0cec KW |
1440 | /* NULL means an empty set of options */ |
1441 | if (options == NULL) { | |
1442 | options = qdict_new(); | |
1443 | } | |
1444 | ||
17b005f1 | 1445 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
462f5bcf KW |
1446 | if (local_err) { |
1447 | goto fail; | |
1448 | } | |
1449 | ||
76c591b0 KW |
1450 | /* Find the right image format driver */ |
1451 | drv = NULL; | |
1452 | drvname = qdict_get_try_str(options, "driver"); | |
1453 | if (drvname) { | |
1454 | drv = bdrv_find_format(drvname); | |
1455 | qdict_del(options, "driver"); | |
1456 | if (!drv) { | |
1457 | error_setg(errp, "Unknown driver: '%s'", drvname); | |
1458 | ret = -EINVAL; | |
1459 | goto fail; | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); | |
1464 | if (drv && !drv->bdrv_file_open) { | |
1465 | /* If the user explicitly wants a format driver here, we'll need to add | |
1466 | * another layer for the protocol in bs->file */ | |
1467 | flags &= ~BDRV_O_PROTOCOL; | |
1468 | } | |
1469 | ||
de9c0cec | 1470 | bs->options = options; |
b6ad491a | 1471 | options = qdict_clone_shallow(options); |
de9c0cec | 1472 | |
f500a6d3 | 1473 | /* Open image file without format layer */ |
f4788adc KW |
1474 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
1475 | if (flags & BDRV_O_RDWR) { | |
1476 | flags |= BDRV_O_ALLOW_RDWR; | |
1477 | } | |
1478 | if (flags & BDRV_O_SNAPSHOT) { | |
1479 | snapshot_flags = bdrv_temp_snapshot_flags(flags); | |
1480 | flags = bdrv_backing_flags(flags); | |
1481 | } | |
f500a6d3 | 1482 | |
f4788adc KW |
1483 | assert(file == NULL); |
1484 | ret = bdrv_open_image(&file, filename, options, "file", | |
1485 | bdrv_inherited_flags(flags), | |
1486 | true, &local_err); | |
1487 | if (ret < 0) { | |
1488 | goto fail; | |
1489 | } | |
f500a6d3 KW |
1490 | } |
1491 | ||
76c591b0 KW |
1492 | /* Image format probing */ |
1493 | if (!drv && file) { | |
17b005f1 KW |
1494 | ret = find_image_format(file, filename, &drv, &local_err); |
1495 | if (ret < 0) { | |
8bfea15d | 1496 | goto fail; |
2a05cbe4 | 1497 | } |
76c591b0 | 1498 | } else if (!drv) { |
17b005f1 KW |
1499 | error_setg(errp, "Must specify either driver or file"); |
1500 | ret = -EINVAL; | |
8bfea15d | 1501 | goto fail; |
ea2384d3 | 1502 | } |
b6ce07aa KW |
1503 | |
1504 | /* Open the image */ | |
34b5d2c6 | 1505 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
b6ce07aa | 1506 | if (ret < 0) { |
8bfea15d | 1507 | goto fail; |
6987307c CH |
1508 | } |
1509 | ||
2a05cbe4 | 1510 | if (file && (bs->file != file)) { |
4f6fd349 | 1511 | bdrv_unref(file); |
f500a6d3 KW |
1512 | file = NULL; |
1513 | } | |
1514 | ||
b6ce07aa | 1515 | /* If there is a backing file, use it */ |
9156df12 | 1516 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1517 | QDict *backing_options; |
1518 | ||
5726d872 | 1519 | qdict_extract_subqdict(options, &backing_options, "backing."); |
34b5d2c6 | 1520 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
b6ce07aa | 1521 | if (ret < 0) { |
b6ad491a | 1522 | goto close_and_fail; |
b6ce07aa | 1523 | } |
b6ce07aa KW |
1524 | } |
1525 | ||
91af7014 HR |
1526 | bdrv_refresh_filename(bs); |
1527 | ||
b998875d KW |
1528 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
1529 | * temporary snapshot afterwards. */ | |
b1e6fc08 | 1530 | if (snapshot_flags) { |
6b8aeca5 | 1531 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
b998875d | 1532 | if (local_err) { |
b998875d KW |
1533 | goto close_and_fail; |
1534 | } | |
1535 | } | |
1536 | ||
b6ad491a | 1537 | /* Check if any unknown options were used */ |
5acd9d81 | 1538 | if (options && (qdict_size(options) != 0)) { |
b6ad491a | 1539 | const QDictEntry *entry = qdict_first(options); |
5acd9d81 HR |
1540 | if (flags & BDRV_O_PROTOCOL) { |
1541 | error_setg(errp, "Block protocol '%s' doesn't support the option " | |
1542 | "'%s'", drv->format_name, entry->key); | |
1543 | } else { | |
1544 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " | |
1545 | "support the option '%s'", drv->format_name, | |
1546 | bs->device_name, entry->key); | |
1547 | } | |
b6ad491a KW |
1548 | |
1549 | ret = -EINVAL; | |
1550 | goto close_and_fail; | |
1551 | } | |
b6ad491a | 1552 | |
b6ce07aa | 1553 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1554 | bdrv_dev_change_media_cb(bs, true); |
c3adb58f MA |
1555 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
1556 | && !runstate_check(RUN_STATE_INMIGRATE) | |
1557 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ | |
1558 | error_setg(errp, | |
1559 | "Guest must be stopped for opening of encrypted image"); | |
1560 | ret = -EBUSY; | |
1561 | goto close_and_fail; | |
b6ce07aa KW |
1562 | } |
1563 | ||
c3adb58f | 1564 | QDECREF(options); |
f67503e5 | 1565 | *pbs = bs; |
b6ce07aa KW |
1566 | return 0; |
1567 | ||
8bfea15d | 1568 | fail: |
f500a6d3 | 1569 | if (file != NULL) { |
4f6fd349 | 1570 | bdrv_unref(file); |
f500a6d3 | 1571 | } |
de9c0cec | 1572 | QDECREF(bs->options); |
b6ad491a | 1573 | QDECREF(options); |
de9c0cec | 1574 | bs->options = NULL; |
f67503e5 HR |
1575 | if (!*pbs) { |
1576 | /* If *pbs is NULL, a new BDS has been created in this function and | |
1577 | needs to be freed now. Otherwise, it does not need to be closed, | |
1578 | since it has not really been opened yet. */ | |
1579 | bdrv_unref(bs); | |
1580 | } | |
84d18f06 | 1581 | if (local_err) { |
34b5d2c6 HR |
1582 | error_propagate(errp, local_err); |
1583 | } | |
b6ad491a | 1584 | return ret; |
de9c0cec | 1585 | |
b6ad491a | 1586 | close_and_fail: |
f67503e5 HR |
1587 | /* See fail path, but now the BDS has to be always closed */ |
1588 | if (*pbs) { | |
1589 | bdrv_close(bs); | |
1590 | } else { | |
1591 | bdrv_unref(bs); | |
1592 | } | |
b6ad491a | 1593 | QDECREF(options); |
84d18f06 | 1594 | if (local_err) { |
34b5d2c6 HR |
1595 | error_propagate(errp, local_err); |
1596 | } | |
b6ce07aa KW |
1597 | return ret; |
1598 | } | |
1599 | ||
e971aa12 JC |
1600 | typedef struct BlockReopenQueueEntry { |
1601 | bool prepared; | |
1602 | BDRVReopenState state; | |
1603 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1604 | } BlockReopenQueueEntry; | |
1605 | ||
1606 | /* | |
1607 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1608 | * reopen of multiple devices. | |
1609 | * | |
1610 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1611 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1612 | * be created and initialized. This newly created BlockReopenQueue should be | |
1613 | * passed back in for subsequent calls that are intended to be of the same | |
1614 | * atomic 'set'. | |
1615 | * | |
1616 | * bs is the BlockDriverState to add to the reopen queue. | |
1617 | * | |
1618 | * flags contains the open flags for the associated bs | |
1619 | * | |
1620 | * returns a pointer to bs_queue, which is either the newly allocated | |
1621 | * bs_queue, or the existing bs_queue being used. | |
1622 | * | |
1623 | */ | |
1624 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1625 | BlockDriverState *bs, int flags) | |
1626 | { | |
1627 | assert(bs != NULL); | |
1628 | ||
1629 | BlockReopenQueueEntry *bs_entry; | |
1630 | if (bs_queue == NULL) { | |
1631 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1632 | QSIMPLEQ_INIT(bs_queue); | |
1633 | } | |
1634 | ||
f1f25a2e KW |
1635 | /* bdrv_open() masks this flag out */ |
1636 | flags &= ~BDRV_O_PROTOCOL; | |
1637 | ||
e971aa12 | 1638 | if (bs->file) { |
f1f25a2e | 1639 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
e971aa12 JC |
1640 | } |
1641 | ||
1642 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1643 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1644 | ||
1645 | bs_entry->state.bs = bs; | |
1646 | bs_entry->state.flags = flags; | |
1647 | ||
1648 | return bs_queue; | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1653 | * | |
1654 | * The queue passed in (bs_queue) must have been built up previous | |
1655 | * via bdrv_reopen_queue(). | |
1656 | * | |
1657 | * Reopens all BDS specified in the queue, with the appropriate | |
1658 | * flags. All devices are prepared for reopen, and failure of any | |
1659 | * device will cause all device changes to be abandonded, and intermediate | |
1660 | * data cleaned up. | |
1661 | * | |
1662 | * If all devices prepare successfully, then the changes are committed | |
1663 | * to all devices. | |
1664 | * | |
1665 | */ | |
1666 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1667 | { | |
1668 | int ret = -1; | |
1669 | BlockReopenQueueEntry *bs_entry, *next; | |
1670 | Error *local_err = NULL; | |
1671 | ||
1672 | assert(bs_queue != NULL); | |
1673 | ||
1674 | bdrv_drain_all(); | |
1675 | ||
1676 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1677 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1678 | error_propagate(errp, local_err); | |
1679 | goto cleanup; | |
1680 | } | |
1681 | bs_entry->prepared = true; | |
1682 | } | |
1683 | ||
1684 | /* If we reach this point, we have success and just need to apply the | |
1685 | * changes | |
1686 | */ | |
1687 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1688 | bdrv_reopen_commit(&bs_entry->state); | |
1689 | } | |
1690 | ||
1691 | ret = 0; | |
1692 | ||
1693 | cleanup: | |
1694 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1695 | if (ret && bs_entry->prepared) { | |
1696 | bdrv_reopen_abort(&bs_entry->state); | |
1697 | } | |
1698 | g_free(bs_entry); | |
1699 | } | |
1700 | g_free(bs_queue); | |
1701 | return ret; | |
1702 | } | |
1703 | ||
1704 | ||
1705 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1706 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1707 | { | |
1708 | int ret = -1; | |
1709 | Error *local_err = NULL; | |
1710 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1711 | ||
1712 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1713 | if (local_err != NULL) { | |
1714 | error_propagate(errp, local_err); | |
1715 | } | |
1716 | return ret; | |
1717 | } | |
1718 | ||
1719 | ||
1720 | /* | |
1721 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1722 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1723 | * the block driver layer .bdrv_reopen_prepare() | |
1724 | * | |
1725 | * bs is the BlockDriverState to reopen | |
1726 | * flags are the new open flags | |
1727 | * queue is the reopen queue | |
1728 | * | |
1729 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1730 | * as well. | |
1731 | * | |
1732 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1733 | * It is the responsibility of the caller to then call the abort() or | |
1734 | * commit() for any other BDS that have been left in a prepare() state | |
1735 | * | |
1736 | */ | |
1737 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1738 | Error **errp) | |
1739 | { | |
1740 | int ret = -1; | |
1741 | Error *local_err = NULL; | |
1742 | BlockDriver *drv; | |
1743 | ||
1744 | assert(reopen_state != NULL); | |
1745 | assert(reopen_state->bs->drv != NULL); | |
1746 | drv = reopen_state->bs->drv; | |
1747 | ||
1748 | /* if we are to stay read-only, do not allow permission change | |
1749 | * to r/w */ | |
1750 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1751 | reopen_state->flags & BDRV_O_RDWR) { | |
1752 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1753 | reopen_state->bs->device_name); | |
1754 | goto error; | |
1755 | } | |
1756 | ||
1757 | ||
1758 | ret = bdrv_flush(reopen_state->bs); | |
1759 | if (ret) { | |
1760 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1761 | strerror(-ret)); | |
1762 | goto error; | |
1763 | } | |
1764 | ||
1765 | if (drv->bdrv_reopen_prepare) { | |
1766 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1767 | if (ret) { | |
1768 | if (local_err != NULL) { | |
1769 | error_propagate(errp, local_err); | |
1770 | } else { | |
d8b6895f LC |
1771 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1772 | reopen_state->bs->filename); | |
e971aa12 JC |
1773 | } |
1774 | goto error; | |
1775 | } | |
1776 | } else { | |
1777 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1778 | * handler for each supported drv. */ | |
1779 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1780 | drv->format_name, reopen_state->bs->device_name, | |
1781 | "reopening of file"); | |
1782 | ret = -1; | |
1783 | goto error; | |
1784 | } | |
1785 | ||
1786 | ret = 0; | |
1787 | ||
1788 | error: | |
1789 | return ret; | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1794 | * makes them final by swapping the staging BlockDriverState contents into | |
1795 | * the active BlockDriverState contents. | |
1796 | */ | |
1797 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1798 | { | |
1799 | BlockDriver *drv; | |
1800 | ||
1801 | assert(reopen_state != NULL); | |
1802 | drv = reopen_state->bs->drv; | |
1803 | assert(drv != NULL); | |
1804 | ||
1805 | /* If there are any driver level actions to take */ | |
1806 | if (drv->bdrv_reopen_commit) { | |
1807 | drv->bdrv_reopen_commit(reopen_state); | |
1808 | } | |
1809 | ||
1810 | /* set BDS specific flags now */ | |
1811 | reopen_state->bs->open_flags = reopen_state->flags; | |
1812 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1813 | BDRV_O_CACHE_WB); | |
1814 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
355ef4ac | 1815 | |
3baca891 | 1816 | bdrv_refresh_limits(reopen_state->bs, NULL); |
e971aa12 JC |
1817 | } |
1818 | ||
1819 | /* | |
1820 | * Abort the reopen, and delete and free the staged changes in | |
1821 | * reopen_state | |
1822 | */ | |
1823 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1824 | { | |
1825 | BlockDriver *drv; | |
1826 | ||
1827 | assert(reopen_state != NULL); | |
1828 | drv = reopen_state->bs->drv; | |
1829 | assert(drv != NULL); | |
1830 | ||
1831 | if (drv->bdrv_reopen_abort) { | |
1832 | drv->bdrv_reopen_abort(reopen_state); | |
1833 | } | |
1834 | } | |
1835 | ||
1836 | ||
fc01f7e7 FB |
1837 | void bdrv_close(BlockDriverState *bs) |
1838 | { | |
33384421 HR |
1839 | BdrvAioNotifier *ban, *ban_next; |
1840 | ||
3cbc002c PB |
1841 | if (bs->job) { |
1842 | block_job_cancel_sync(bs->job); | |
1843 | } | |
58fda173 SH |
1844 | bdrv_drain_all(); /* complete I/O */ |
1845 | bdrv_flush(bs); | |
1846 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1847 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1848 | |
3cbc002c | 1849 | if (bs->drv) { |
557df6ac | 1850 | if (bs->backing_hd) { |
826b6ca0 FZ |
1851 | BlockDriverState *backing_hd = bs->backing_hd; |
1852 | bdrv_set_backing_hd(bs, NULL); | |
1853 | bdrv_unref(backing_hd); | |
557df6ac | 1854 | } |
ea2384d3 | 1855 | bs->drv->bdrv_close(bs); |
7267c094 | 1856 | g_free(bs->opaque); |
ea2384d3 FB |
1857 | bs->opaque = NULL; |
1858 | bs->drv = NULL; | |
53fec9d3 | 1859 | bs->copy_on_read = 0; |
a275fa42 PB |
1860 | bs->backing_file[0] = '\0'; |
1861 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1862 | bs->total_sectors = 0; |
1863 | bs->encrypted = 0; | |
1864 | bs->valid_key = 0; | |
1865 | bs->sg = 0; | |
1866 | bs->growable = 0; | |
0d51b4de | 1867 | bs->zero_beyond_eof = false; |
de9c0cec KW |
1868 | QDECREF(bs->options); |
1869 | bs->options = NULL; | |
91af7014 HR |
1870 | QDECREF(bs->full_open_options); |
1871 | bs->full_open_options = NULL; | |
b338082b | 1872 | |
66f82cee | 1873 | if (bs->file != NULL) { |
4f6fd349 | 1874 | bdrv_unref(bs->file); |
0ac9377d | 1875 | bs->file = NULL; |
66f82cee | 1876 | } |
b338082b | 1877 | } |
98f90dba | 1878 | |
9ca11154 PH |
1879 | bdrv_dev_change_media_cb(bs, false); |
1880 | ||
98f90dba ZYW |
1881 | /*throttling disk I/O limits*/ |
1882 | if (bs->io_limits_enabled) { | |
1883 | bdrv_io_limits_disable(bs); | |
1884 | } | |
33384421 HR |
1885 | |
1886 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
1887 | g_free(ban); | |
1888 | } | |
1889 | QLIST_INIT(&bs->aio_notifiers); | |
b338082b FB |
1890 | } |
1891 | ||
2bc93fed MK |
1892 | void bdrv_close_all(void) |
1893 | { | |
1894 | BlockDriverState *bs; | |
1895 | ||
dc364f4c | 1896 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
1897 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1898 | ||
1899 | aio_context_acquire(aio_context); | |
2bc93fed | 1900 | bdrv_close(bs); |
ed78cda3 | 1901 | aio_context_release(aio_context); |
2bc93fed MK |
1902 | } |
1903 | } | |
1904 | ||
88266f5a SH |
1905 | /* Check if any requests are in-flight (including throttled requests) */ |
1906 | static bool bdrv_requests_pending(BlockDriverState *bs) | |
1907 | { | |
1908 | if (!QLIST_EMPTY(&bs->tracked_requests)) { | |
1909 | return true; | |
1910 | } | |
cc0681c4 BC |
1911 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
1912 | return true; | |
1913 | } | |
1914 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { | |
88266f5a SH |
1915 | return true; |
1916 | } | |
1917 | if (bs->file && bdrv_requests_pending(bs->file)) { | |
1918 | return true; | |
1919 | } | |
1920 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { | |
1921 | return true; | |
1922 | } | |
1923 | return false; | |
1924 | } | |
1925 | ||
922453bc SH |
1926 | /* |
1927 | * Wait for pending requests to complete across all BlockDriverStates | |
1928 | * | |
1929 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1930 | * after calling this function. | |
4c355d53 ZYW |
1931 | * |
1932 | * Note that completion of an asynchronous I/O operation can trigger any | |
1933 | * number of other I/O operations on other devices---for example a coroutine | |
1934 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1935 | * coroutine is complete. Because of this, it is not possible to have a | |
1936 | * function to drain a single device's I/O queue. | |
922453bc SH |
1937 | */ |
1938 | void bdrv_drain_all(void) | |
1939 | { | |
88266f5a SH |
1940 | /* Always run first iteration so any pending completion BHs run */ |
1941 | bool busy = true; | |
922453bc SH |
1942 | BlockDriverState *bs; |
1943 | ||
88266f5a | 1944 | while (busy) { |
9b536adc SH |
1945 | busy = false; |
1946 | ||
dc364f4c | 1947 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
9b536adc SH |
1948 | AioContext *aio_context = bdrv_get_aio_context(bs); |
1949 | bool bs_busy; | |
1950 | ||
1951 | aio_context_acquire(aio_context); | |
448ad91d | 1952 | bdrv_flush_io_queue(bs); |
0b06ef3b | 1953 | bdrv_start_throttled_reqs(bs); |
9b536adc SH |
1954 | bs_busy = bdrv_requests_pending(bs); |
1955 | bs_busy |= aio_poll(aio_context, bs_busy); | |
1956 | aio_context_release(aio_context); | |
922453bc | 1957 | |
9b536adc SH |
1958 | busy |= bs_busy; |
1959 | } | |
922453bc SH |
1960 | } |
1961 | } | |
1962 | ||
dc364f4c BC |
1963 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
1964 | * graph_bdrv_state list. | |
d22b2f41 RH |
1965 | Also, NULL terminate the device_name to prevent double remove */ |
1966 | void bdrv_make_anon(BlockDriverState *bs) | |
1967 | { | |
1968 | if (bs->device_name[0] != '\0') { | |
dc364f4c | 1969 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
d22b2f41 RH |
1970 | } |
1971 | bs->device_name[0] = '\0'; | |
dc364f4c BC |
1972 | if (bs->node_name[0] != '\0') { |
1973 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); | |
1974 | } | |
1975 | bs->node_name[0] = '\0'; | |
d22b2f41 RH |
1976 | } |
1977 | ||
e023b2e2 PB |
1978 | static void bdrv_rebind(BlockDriverState *bs) |
1979 | { | |
1980 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1981 | bs->drv->bdrv_rebind(bs); | |
1982 | } | |
1983 | } | |
1984 | ||
4ddc07ca PB |
1985 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1986 | BlockDriverState *bs_src) | |
8802d1fd | 1987 | { |
4ddc07ca | 1988 | /* move some fields that need to stay attached to the device */ |
8802d1fd JC |
1989 | |
1990 | /* dev info */ | |
4ddc07ca PB |
1991 | bs_dest->dev_ops = bs_src->dev_ops; |
1992 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1993 | bs_dest->dev = bs_src->dev; | |
1b7fd729 | 1994 | bs_dest->guest_block_size = bs_src->guest_block_size; |
4ddc07ca | 1995 | bs_dest->copy_on_read = bs_src->copy_on_read; |
8802d1fd | 1996 | |
4ddc07ca | 1997 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1998 | |
cc0681c4 BC |
1999 | /* i/o throttled req */ |
2000 | memcpy(&bs_dest->throttle_state, | |
2001 | &bs_src->throttle_state, | |
2002 | sizeof(ThrottleState)); | |
2003 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; | |
2004 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; | |
4ddc07ca | 2005 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
8802d1fd | 2006 | |
8802d1fd | 2007 | /* r/w error */ |
4ddc07ca PB |
2008 | bs_dest->on_read_error = bs_src->on_read_error; |
2009 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
2010 | |
2011 | /* i/o status */ | |
4ddc07ca PB |
2012 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
2013 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 2014 | |
a9fc4408 | 2015 | /* dirty bitmap */ |
e4654d2d | 2016 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
a9fc4408 | 2017 | |
9fcb0251 FZ |
2018 | /* reference count */ |
2019 | bs_dest->refcnt = bs_src->refcnt; | |
2020 | ||
a9fc4408 | 2021 | /* job */ |
4ddc07ca | 2022 | bs_dest->job = bs_src->job; |
a9fc4408 | 2023 | |
8802d1fd | 2024 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
2025 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
2026 | bs_src->device_name); | |
dc364f4c | 2027 | bs_dest->device_list = bs_src->device_list; |
7e7d56d9 MA |
2028 | bs_dest->blk = bs_src->blk; |
2029 | ||
fbe40ff7 FZ |
2030 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
2031 | sizeof(bs_dest->op_blockers)); | |
4ddc07ca | 2032 | } |
8802d1fd | 2033 | |
4ddc07ca PB |
2034 | /* |
2035 | * Swap bs contents for two image chains while they are live, | |
2036 | * while keeping required fields on the BlockDriverState that is | |
2037 | * actually attached to a device. | |
2038 | * | |
2039 | * This will modify the BlockDriverState fields, and swap contents | |
2040 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
2041 | * | |
7e7d56d9 | 2042 | * bs_new must be nameless and not attached to a BlockBackend. |
4ddc07ca PB |
2043 | * |
2044 | * This function does not create any image files. | |
2045 | */ | |
2046 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
2047 | { | |
2048 | BlockDriverState tmp; | |
f6801b83 | 2049 | |
90ce8a06 BC |
2050 | /* The code needs to swap the node_name but simply swapping node_list won't |
2051 | * work so first remove the nodes from the graph list, do the swap then | |
2052 | * insert them back if needed. | |
2053 | */ | |
2054 | if (bs_new->node_name[0] != '\0') { | |
2055 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); | |
2056 | } | |
2057 | if (bs_old->node_name[0] != '\0') { | |
2058 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); | |
2059 | } | |
2060 | ||
7e7d56d9 | 2061 | /* bs_new must be nameless and shouldn't have anything fancy enabled */ |
4ddc07ca | 2062 | assert(bs_new->device_name[0] == '\0'); |
7e7d56d9 | 2063 | assert(!bs_new->blk); |
e4654d2d | 2064 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
4ddc07ca PB |
2065 | assert(bs_new->job == NULL); |
2066 | assert(bs_new->dev == NULL); | |
4ddc07ca | 2067 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2068 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
8802d1fd | 2069 | |
4ddc07ca PB |
2070 | tmp = *bs_new; |
2071 | *bs_new = *bs_old; | |
2072 | *bs_old = tmp; | |
a9fc4408 | 2073 | |
4ddc07ca PB |
2074 | /* there are some fields that should not be swapped, move them back */ |
2075 | bdrv_move_feature_fields(&tmp, bs_old); | |
2076 | bdrv_move_feature_fields(bs_old, bs_new); | |
2077 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 2078 | |
7e7d56d9 | 2079 | /* bs_new must remain nameless and unattached */ |
4ddc07ca | 2080 | assert(bs_new->device_name[0] == '\0'); |
7e7d56d9 | 2081 | assert(!bs_new->blk); |
4ddc07ca PB |
2082 | |
2083 | /* Check a few fields that should remain attached to the device */ | |
2084 | assert(bs_new->dev == NULL); | |
2085 | assert(bs_new->job == NULL); | |
4ddc07ca | 2086 | assert(bs_new->io_limits_enabled == false); |
cc0681c4 | 2087 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
e023b2e2 | 2088 | |
90ce8a06 BC |
2089 | /* insert the nodes back into the graph node list if needed */ |
2090 | if (bs_new->node_name[0] != '\0') { | |
2091 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); | |
2092 | } | |
2093 | if (bs_old->node_name[0] != '\0') { | |
2094 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); | |
2095 | } | |
2096 | ||
e023b2e2 | 2097 | bdrv_rebind(bs_new); |
4ddc07ca PB |
2098 | bdrv_rebind(bs_old); |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * Add new bs contents at the top of an image chain while the chain is | |
2103 | * live, while keeping required fields on the top layer. | |
2104 | * | |
2105 | * This will modify the BlockDriverState fields, and swap contents | |
2106 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
2107 | * | |
7e7d56d9 | 2108 | * bs_new must be nameless and not attached to a BlockBackend. |
4ddc07ca PB |
2109 | * |
2110 | * This function does not create any image files. | |
2111 | */ | |
2112 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
2113 | { | |
2114 | bdrv_swap(bs_new, bs_top); | |
2115 | ||
2116 | /* The contents of 'tmp' will become bs_top, as we are | |
2117 | * swapping bs_new and bs_top contents. */ | |
8d24cce1 | 2118 | bdrv_set_backing_hd(bs_top, bs_new); |
8802d1fd JC |
2119 | } |
2120 | ||
4f6fd349 | 2121 | static void bdrv_delete(BlockDriverState *bs) |
b338082b | 2122 | { |
fa879d62 | 2123 | assert(!bs->dev); |
3e914655 | 2124 | assert(!bs->job); |
3718d8ab | 2125 | assert(bdrv_op_blocker_is_empty(bs)); |
4f6fd349 | 2126 | assert(!bs->refcnt); |
e4654d2d | 2127 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
18846dee | 2128 | |
e1b5c52e SH |
2129 | bdrv_close(bs); |
2130 | ||
1b7bdbc1 | 2131 | /* remove from list, if necessary */ |
d22b2f41 | 2132 | bdrv_make_anon(bs); |
34c6f050 | 2133 | |
3ae59580 | 2134 | drive_info_del(drive_get_by_blockdev(bs)); |
7267c094 | 2135 | g_free(bs); |
fc01f7e7 FB |
2136 | } |
2137 | ||
fa879d62 MA |
2138 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
2139 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 2140 | { |
fa879d62 | 2141 | if (bs->dev) { |
18846dee MA |
2142 | return -EBUSY; |
2143 | } | |
fa879d62 | 2144 | bs->dev = dev; |
28a7282a | 2145 | bdrv_iostatus_reset(bs); |
2a87151f SH |
2146 | |
2147 | /* We're expecting I/O from the device so bump up coroutine pool size */ | |
2148 | qemu_coroutine_adjust_pool_size(COROUTINE_POOL_RESERVATION); | |
18846dee MA |
2149 | return 0; |
2150 | } | |
2151 | ||
fa879d62 MA |
2152 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
2153 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 2154 | { |
fa879d62 MA |
2155 | if (bdrv_attach_dev(bs, dev) < 0) { |
2156 | abort(); | |
2157 | } | |
2158 | } | |
2159 | ||
2160 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
2161 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
2162 | { | |
2163 | assert(bs->dev == dev); | |
2164 | bs->dev = NULL; | |
0e49de52 MA |
2165 | bs->dev_ops = NULL; |
2166 | bs->dev_opaque = NULL; | |
1b7fd729 | 2167 | bs->guest_block_size = 512; |
2a87151f | 2168 | qemu_coroutine_adjust_pool_size(-COROUTINE_POOL_RESERVATION); |
18846dee MA |
2169 | } |
2170 | ||
fa879d62 MA |
2171 | /* TODO change to return DeviceState * when all users are qdevified */ |
2172 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 2173 | { |
fa879d62 | 2174 | return bs->dev; |
18846dee MA |
2175 | } |
2176 | ||
0e49de52 MA |
2177 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
2178 | void *opaque) | |
2179 | { | |
2180 | bs->dev_ops = ops; | |
2181 | bs->dev_opaque = opaque; | |
2182 | } | |
2183 | ||
7d4b4ba5 | 2184 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 2185 | { |
145feb17 | 2186 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 2187 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 2188 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
2189 | if (tray_was_closed) { |
2190 | /* tray open */ | |
a5ee7bd4 WX |
2191 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
2192 | true, &error_abort); | |
6f382ed2 LC |
2193 | } |
2194 | if (load) { | |
2195 | /* tray close */ | |
a5ee7bd4 WX |
2196 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
2197 | false, &error_abort); | |
6f382ed2 | 2198 | } |
145feb17 MA |
2199 | } |
2200 | } | |
2201 | ||
2c6942fa MA |
2202 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
2203 | { | |
2204 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
2205 | } | |
2206 | ||
025ccaa7 PB |
2207 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
2208 | { | |
2209 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
2210 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
2211 | } | |
2212 | } | |
2213 | ||
e4def80b MA |
2214 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
2215 | { | |
2216 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
2217 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
2218 | } | |
2219 | return false; | |
2220 | } | |
2221 | ||
145feb17 MA |
2222 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
2223 | { | |
2224 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
2225 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
2226 | } |
2227 | } | |
2228 | ||
f107639a MA |
2229 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
2230 | { | |
2231 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
2232 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
2233 | } | |
2234 | return false; | |
2235 | } | |
2236 | ||
e97fc193 AL |
2237 | /* |
2238 | * Run consistency checks on an image | |
2239 | * | |
e076f338 | 2240 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 2241 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 2242 | * check are stored in res. |
e97fc193 | 2243 | */ |
4534ff54 | 2244 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 | 2245 | { |
908bcd54 HR |
2246 | if (bs->drv == NULL) { |
2247 | return -ENOMEDIUM; | |
2248 | } | |
e97fc193 AL |
2249 | if (bs->drv->bdrv_check == NULL) { |
2250 | return -ENOTSUP; | |
2251 | } | |
2252 | ||
e076f338 | 2253 | memset(res, 0, sizeof(*res)); |
4534ff54 | 2254 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
2255 | } |
2256 | ||
8a426614 KW |
2257 | #define COMMIT_BUF_SECTORS 2048 |
2258 | ||
33e3963e FB |
2259 | /* commit COW file into the raw image */ |
2260 | int bdrv_commit(BlockDriverState *bs) | |
2261 | { | |
19cb3738 | 2262 | BlockDriver *drv = bs->drv; |
72706ea4 | 2263 | int64_t sector, total_sectors, length, backing_length; |
8a426614 | 2264 | int n, ro, open_flags; |
0bce597d | 2265 | int ret = 0; |
72706ea4 | 2266 | uint8_t *buf = NULL; |
c2cba3d9 | 2267 | char filename[PATH_MAX]; |
33e3963e | 2268 | |
19cb3738 FB |
2269 | if (!drv) |
2270 | return -ENOMEDIUM; | |
6bb45158 | 2271 | |
4dca4b63 NS |
2272 | if (!bs->backing_hd) { |
2273 | return -ENOTSUP; | |
33e3963e FB |
2274 | } |
2275 | ||
3718d8ab FZ |
2276 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) || |
2277 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) { | |
2d3735d3 SH |
2278 | return -EBUSY; |
2279 | } | |
2280 | ||
4dca4b63 | 2281 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
2282 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
2283 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
2284 | open_flags = bs->backing_hd->open_flags; |
2285 | ||
2286 | if (ro) { | |
0bce597d JC |
2287 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
2288 | return -EACCES; | |
4dca4b63 | 2289 | } |
ea2384d3 | 2290 | } |
33e3963e | 2291 | |
72706ea4 JC |
2292 | length = bdrv_getlength(bs); |
2293 | if (length < 0) { | |
2294 | ret = length; | |
2295 | goto ro_cleanup; | |
2296 | } | |
2297 | ||
2298 | backing_length = bdrv_getlength(bs->backing_hd); | |
2299 | if (backing_length < 0) { | |
2300 | ret = backing_length; | |
2301 | goto ro_cleanup; | |
2302 | } | |
2303 | ||
2304 | /* If our top snapshot is larger than the backing file image, | |
2305 | * grow the backing file image if possible. If not possible, | |
2306 | * we must return an error */ | |
2307 | if (length > backing_length) { | |
2308 | ret = bdrv_truncate(bs->backing_hd, length); | |
2309 | if (ret < 0) { | |
2310 | goto ro_cleanup; | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | total_sectors = length >> BDRV_SECTOR_BITS; | |
857d4f46 KW |
2315 | |
2316 | /* qemu_try_blockalign() for bs will choose an alignment that works for | |
2317 | * bs->backing_hd as well, so no need to compare the alignment manually. */ | |
2318 | buf = qemu_try_blockalign(bs, COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
2319 | if (buf == NULL) { | |
2320 | ret = -ENOMEM; | |
2321 | goto ro_cleanup; | |
2322 | } | |
8a426614 KW |
2323 | |
2324 | for (sector = 0; sector < total_sectors; sector += n) { | |
d663640c PB |
2325 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
2326 | if (ret < 0) { | |
2327 | goto ro_cleanup; | |
2328 | } | |
2329 | if (ret) { | |
dabfa6cc KW |
2330 | ret = bdrv_read(bs, sector, buf, n); |
2331 | if (ret < 0) { | |
8a426614 KW |
2332 | goto ro_cleanup; |
2333 | } | |
2334 | ||
dabfa6cc KW |
2335 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
2336 | if (ret < 0) { | |
8a426614 KW |
2337 | goto ro_cleanup; |
2338 | } | |
ea2384d3 | 2339 | } |
33e3963e | 2340 | } |
95389c86 | 2341 | |
1d44952f CH |
2342 | if (drv->bdrv_make_empty) { |
2343 | ret = drv->bdrv_make_empty(bs); | |
dabfa6cc KW |
2344 | if (ret < 0) { |
2345 | goto ro_cleanup; | |
2346 | } | |
1d44952f CH |
2347 | bdrv_flush(bs); |
2348 | } | |
95389c86 | 2349 | |
3f5075ae CH |
2350 | /* |
2351 | * Make sure all data we wrote to the backing device is actually | |
2352 | * stable on disk. | |
2353 | */ | |
dabfa6cc | 2354 | if (bs->backing_hd) { |
3f5075ae | 2355 | bdrv_flush(bs->backing_hd); |
dabfa6cc | 2356 | } |
4dca4b63 | 2357 | |
dabfa6cc | 2358 | ret = 0; |
4dca4b63 | 2359 | ro_cleanup: |
857d4f46 | 2360 | qemu_vfree(buf); |
4dca4b63 NS |
2361 | |
2362 | if (ro) { | |
0bce597d JC |
2363 | /* ignoring error return here */ |
2364 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
2365 | } |
2366 | ||
1d44952f | 2367 | return ret; |
33e3963e FB |
2368 | } |
2369 | ||
e8877497 | 2370 | int bdrv_commit_all(void) |
6ab4b5ab MA |
2371 | { |
2372 | BlockDriverState *bs; | |
2373 | ||
dc364f4c | 2374 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
2375 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2376 | ||
2377 | aio_context_acquire(aio_context); | |
272d2d8e JC |
2378 | if (bs->drv && bs->backing_hd) { |
2379 | int ret = bdrv_commit(bs); | |
2380 | if (ret < 0) { | |
ed78cda3 | 2381 | aio_context_release(aio_context); |
272d2d8e JC |
2382 | return ret; |
2383 | } | |
e8877497 | 2384 | } |
ed78cda3 | 2385 | aio_context_release(aio_context); |
6ab4b5ab | 2386 | } |
e8877497 | 2387 | return 0; |
6ab4b5ab MA |
2388 | } |
2389 | ||
dbffbdcf SH |
2390 | /** |
2391 | * Remove an active request from the tracked requests list | |
2392 | * | |
2393 | * This function should be called when a tracked request is completing. | |
2394 | */ | |
2395 | static void tracked_request_end(BdrvTrackedRequest *req) | |
2396 | { | |
2dbafdc0 KW |
2397 | if (req->serialising) { |
2398 | req->bs->serialising_in_flight--; | |
2399 | } | |
2400 | ||
dbffbdcf | 2401 | QLIST_REMOVE(req, list); |
f4658285 | 2402 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
2403 | } |
2404 | ||
2405 | /** | |
2406 | * Add an active request to the tracked requests list | |
2407 | */ | |
2408 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
2409 | BlockDriverState *bs, | |
793ed47a KW |
2410 | int64_t offset, |
2411 | unsigned int bytes, bool is_write) | |
dbffbdcf SH |
2412 | { |
2413 | *req = (BdrvTrackedRequest){ | |
2414 | .bs = bs, | |
2dbafdc0 KW |
2415 | .offset = offset, |
2416 | .bytes = bytes, | |
2417 | .is_write = is_write, | |
2418 | .co = qemu_coroutine_self(), | |
2419 | .serialising = false, | |
7327145f KW |
2420 | .overlap_offset = offset, |
2421 | .overlap_bytes = bytes, | |
dbffbdcf SH |
2422 | }; |
2423 | ||
f4658285 SH |
2424 | qemu_co_queue_init(&req->wait_queue); |
2425 | ||
dbffbdcf SH |
2426 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
2427 | } | |
2428 | ||
e96126ff | 2429 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
2dbafdc0 | 2430 | { |
7327145f | 2431 | int64_t overlap_offset = req->offset & ~(align - 1); |
e96126ff KW |
2432 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
2433 | - overlap_offset; | |
7327145f | 2434 | |
2dbafdc0 KW |
2435 | if (!req->serialising) { |
2436 | req->bs->serialising_in_flight++; | |
2437 | req->serialising = true; | |
2438 | } | |
7327145f KW |
2439 | |
2440 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); | |
2441 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); | |
2dbafdc0 KW |
2442 | } |
2443 | ||
d83947ac SH |
2444 | /** |
2445 | * Round a region to cluster boundaries | |
2446 | */ | |
343bded4 PB |
2447 | void bdrv_round_to_clusters(BlockDriverState *bs, |
2448 | int64_t sector_num, int nb_sectors, | |
2449 | int64_t *cluster_sector_num, | |
2450 | int *cluster_nb_sectors) | |
d83947ac SH |
2451 | { |
2452 | BlockDriverInfo bdi; | |
2453 | ||
2454 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
2455 | *cluster_sector_num = sector_num; | |
2456 | *cluster_nb_sectors = nb_sectors; | |
2457 | } else { | |
2458 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
2459 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
2460 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
2461 | nb_sectors, c); | |
2462 | } | |
2463 | } | |
2464 | ||
7327145f | 2465 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
793ed47a KW |
2466 | { |
2467 | BlockDriverInfo bdi; | |
7327145f | 2468 | int ret; |
793ed47a | 2469 | |
7327145f KW |
2470 | ret = bdrv_get_info(bs, &bdi); |
2471 | if (ret < 0 || bdi.cluster_size == 0) { | |
2472 | return bs->request_alignment; | |
793ed47a | 2473 | } else { |
7327145f | 2474 | return bdi.cluster_size; |
793ed47a KW |
2475 | } |
2476 | } | |
2477 | ||
f4658285 | 2478 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
793ed47a KW |
2479 | int64_t offset, unsigned int bytes) |
2480 | { | |
d83947ac | 2481 | /* aaaa bbbb */ |
7327145f | 2482 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
d83947ac SH |
2483 | return false; |
2484 | } | |
2485 | /* bbbb aaaa */ | |
7327145f | 2486 | if (req->overlap_offset >= offset + bytes) { |
d83947ac SH |
2487 | return false; |
2488 | } | |
2489 | return true; | |
f4658285 SH |
2490 | } |
2491 | ||
28de2dcd | 2492 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
f4658285 | 2493 | { |
2dbafdc0 | 2494 | BlockDriverState *bs = self->bs; |
f4658285 SH |
2495 | BdrvTrackedRequest *req; |
2496 | bool retry; | |
28de2dcd | 2497 | bool waited = false; |
f4658285 | 2498 | |
2dbafdc0 | 2499 | if (!bs->serialising_in_flight) { |
28de2dcd | 2500 | return false; |
2dbafdc0 KW |
2501 | } |
2502 | ||
f4658285 SH |
2503 | do { |
2504 | retry = false; | |
2505 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
2dbafdc0 | 2506 | if (req == self || (!req->serialising && !self->serialising)) { |
65afd211 KW |
2507 | continue; |
2508 | } | |
7327145f KW |
2509 | if (tracked_request_overlaps(req, self->overlap_offset, |
2510 | self->overlap_bytes)) | |
2511 | { | |
5f8b6491 SH |
2512 | /* Hitting this means there was a reentrant request, for |
2513 | * example, a block driver issuing nested requests. This must | |
2514 | * never happen since it means deadlock. | |
2515 | */ | |
2516 | assert(qemu_coroutine_self() != req->co); | |
2517 | ||
6460440f KW |
2518 | /* If the request is already (indirectly) waiting for us, or |
2519 | * will wait for us as soon as it wakes up, then just go on | |
2520 | * (instead of producing a deadlock in the former case). */ | |
2521 | if (!req->waiting_for) { | |
2522 | self->waiting_for = req; | |
2523 | qemu_co_queue_wait(&req->wait_queue); | |
2524 | self->waiting_for = NULL; | |
2525 | retry = true; | |
28de2dcd | 2526 | waited = true; |
6460440f KW |
2527 | break; |
2528 | } | |
f4658285 SH |
2529 | } |
2530 | } | |
2531 | } while (retry); | |
28de2dcd KW |
2532 | |
2533 | return waited; | |
f4658285 SH |
2534 | } |
2535 | ||
756e6736 KW |
2536 | /* |
2537 | * Return values: | |
2538 | * 0 - success | |
2539 | * -EINVAL - backing format specified, but no file | |
2540 | * -ENOSPC - can't update the backing file because no space is left in the | |
2541 | * image file header | |
2542 | * -ENOTSUP - format driver doesn't support changing the backing file | |
2543 | */ | |
2544 | int bdrv_change_backing_file(BlockDriverState *bs, | |
2545 | const char *backing_file, const char *backing_fmt) | |
2546 | { | |
2547 | BlockDriver *drv = bs->drv; | |
469ef350 | 2548 | int ret; |
756e6736 | 2549 | |
5f377794 PB |
2550 | /* Backing file format doesn't make sense without a backing file */ |
2551 | if (backing_fmt && !backing_file) { | |
2552 | return -EINVAL; | |
2553 | } | |
2554 | ||
756e6736 | 2555 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 2556 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 2557 | } else { |
469ef350 | 2558 | ret = -ENOTSUP; |
756e6736 | 2559 | } |
469ef350 PB |
2560 | |
2561 | if (ret == 0) { | |
2562 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
2563 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2564 | } | |
2565 | return ret; | |
756e6736 KW |
2566 | } |
2567 | ||
6ebdcee2 JC |
2568 | /* |
2569 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
2570 | * | |
2571 | * active is the current topmost image. | |
2572 | * | |
2573 | * Returns NULL if bs is not found in active's image chain, | |
2574 | * or if active == bs. | |
4caf0fcd JC |
2575 | * |
2576 | * Returns the bottommost base image if bs == NULL. | |
6ebdcee2 JC |
2577 | */ |
2578 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
2579 | BlockDriverState *bs) | |
2580 | { | |
4caf0fcd JC |
2581 | while (active && bs != active->backing_hd) { |
2582 | active = active->backing_hd; | |
6ebdcee2 JC |
2583 | } |
2584 | ||
4caf0fcd JC |
2585 | return active; |
2586 | } | |
6ebdcee2 | 2587 | |
4caf0fcd JC |
2588 | /* Given a BDS, searches for the base layer. */ |
2589 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) | |
2590 | { | |
2591 | return bdrv_find_overlay(bs, NULL); | |
6ebdcee2 JC |
2592 | } |
2593 | ||
2594 | typedef struct BlkIntermediateStates { | |
2595 | BlockDriverState *bs; | |
2596 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2597 | } BlkIntermediateStates; | |
2598 | ||
2599 | ||
2600 | /* | |
2601 | * Drops images above 'base' up to and including 'top', and sets the image | |
2602 | * above 'top' to have base as its backing file. | |
2603 | * | |
2604 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2605 | * information in 'bs' can be properly updated. | |
2606 | * | |
2607 | * E.g., this will convert the following chain: | |
2608 | * bottom <- base <- intermediate <- top <- active | |
2609 | * | |
2610 | * to | |
2611 | * | |
2612 | * bottom <- base <- active | |
2613 | * | |
2614 | * It is allowed for bottom==base, in which case it converts: | |
2615 | * | |
2616 | * base <- intermediate <- top <- active | |
2617 | * | |
2618 | * to | |
2619 | * | |
2620 | * base <- active | |
2621 | * | |
54e26900 JC |
2622 | * If backing_file_str is non-NULL, it will be used when modifying top's |
2623 | * overlay image metadata. | |
2624 | * | |
6ebdcee2 JC |
2625 | * Error conditions: |
2626 | * if active == top, that is considered an error | |
2627 | * | |
2628 | */ | |
2629 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
54e26900 | 2630 | BlockDriverState *base, const char *backing_file_str) |
6ebdcee2 JC |
2631 | { |
2632 | BlockDriverState *intermediate; | |
2633 | BlockDriverState *base_bs = NULL; | |
2634 | BlockDriverState *new_top_bs = NULL; | |
2635 | BlkIntermediateStates *intermediate_state, *next; | |
2636 | int ret = -EIO; | |
2637 | ||
2638 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2639 | QSIMPLEQ_INIT(&states_to_delete); | |
2640 | ||
2641 | if (!top->drv || !base->drv) { | |
2642 | goto exit; | |
2643 | } | |
2644 | ||
2645 | new_top_bs = bdrv_find_overlay(active, top); | |
2646 | ||
2647 | if (new_top_bs == NULL) { | |
2648 | /* we could not find the image above 'top', this is an error */ | |
2649 | goto exit; | |
2650 | } | |
2651 | ||
2652 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2653 | * to do, no intermediate images */ | |
2654 | if (new_top_bs->backing_hd == base) { | |
2655 | ret = 0; | |
2656 | goto exit; | |
2657 | } | |
2658 | ||
2659 | intermediate = top; | |
2660 | ||
2661 | /* now we will go down through the list, and add each BDS we find | |
2662 | * into our deletion queue, until we hit the 'base' | |
2663 | */ | |
2664 | while (intermediate) { | |
5839e53b | 2665 | intermediate_state = g_new0(BlkIntermediateStates, 1); |
6ebdcee2 JC |
2666 | intermediate_state->bs = intermediate; |
2667 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2668 | ||
2669 | if (intermediate->backing_hd == base) { | |
2670 | base_bs = intermediate->backing_hd; | |
2671 | break; | |
2672 | } | |
2673 | intermediate = intermediate->backing_hd; | |
2674 | } | |
2675 | if (base_bs == NULL) { | |
2676 | /* something went wrong, we did not end at the base. safely | |
2677 | * unravel everything, and exit with error */ | |
2678 | goto exit; | |
2679 | } | |
2680 | ||
2681 | /* success - we can delete the intermediate states, and link top->base */ | |
54e26900 JC |
2682 | backing_file_str = backing_file_str ? backing_file_str : base_bs->filename; |
2683 | ret = bdrv_change_backing_file(new_top_bs, backing_file_str, | |
6ebdcee2 JC |
2684 | base_bs->drv ? base_bs->drv->format_name : ""); |
2685 | if (ret) { | |
2686 | goto exit; | |
2687 | } | |
920beae1 | 2688 | bdrv_set_backing_hd(new_top_bs, base_bs); |
6ebdcee2 JC |
2689 | |
2690 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2691 | /* so that bdrv_close() does not recursively close the chain */ | |
920beae1 | 2692 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
4f6fd349 | 2693 | bdrv_unref(intermediate_state->bs); |
6ebdcee2 JC |
2694 | } |
2695 | ret = 0; | |
2696 | ||
2697 | exit: | |
2698 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2699 | g_free(intermediate_state); | |
2700 | } | |
2701 | return ret; | |
2702 | } | |
2703 | ||
2704 | ||
71d0770c AL |
2705 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2706 | size_t size) | |
2707 | { | |
2708 | int64_t len; | |
2709 | ||
1dd3a447 KW |
2710 | if (size > INT_MAX) { |
2711 | return -EIO; | |
2712 | } | |
2713 | ||
71d0770c AL |
2714 | if (!bdrv_is_inserted(bs)) |
2715 | return -ENOMEDIUM; | |
2716 | ||
2717 | if (bs->growable) | |
2718 | return 0; | |
2719 | ||
2720 | len = bdrv_getlength(bs); | |
2721 | ||
fbb7b4e0 KW |
2722 | if (offset < 0) |
2723 | return -EIO; | |
2724 | ||
2725 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2726 | return -EIO; |
2727 | ||
2728 | return 0; | |
2729 | } | |
2730 | ||
2731 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2732 | int nb_sectors) | |
2733 | { | |
54db38a4 | 2734 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
8f4754ed KW |
2735 | return -EIO; |
2736 | } | |
2737 | ||
eb5a3165 JS |
2738 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2739 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2740 | } |
2741 | ||
1c9805a3 SH |
2742 | typedef struct RwCo { |
2743 | BlockDriverState *bs; | |
775aa8b6 | 2744 | int64_t offset; |
1c9805a3 SH |
2745 | QEMUIOVector *qiov; |
2746 | bool is_write; | |
2747 | int ret; | |
4105eaaa | 2748 | BdrvRequestFlags flags; |
1c9805a3 SH |
2749 | } RwCo; |
2750 | ||
2751 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2752 | { |
1c9805a3 | 2753 | RwCo *rwco = opaque; |
ea2384d3 | 2754 | |
1c9805a3 | 2755 | if (!rwco->is_write) { |
775aa8b6 KW |
2756 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
2757 | rwco->qiov->size, rwco->qiov, | |
4105eaaa | 2758 | rwco->flags); |
775aa8b6 KW |
2759 | } else { |
2760 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, | |
2761 | rwco->qiov->size, rwco->qiov, | |
2762 | rwco->flags); | |
1c9805a3 SH |
2763 | } |
2764 | } | |
e7a8a783 | 2765 | |
1c9805a3 | 2766 | /* |
8d3b1a2d | 2767 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2768 | */ |
775aa8b6 KW |
2769 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
2770 | QEMUIOVector *qiov, bool is_write, | |
2771 | BdrvRequestFlags flags) | |
1c9805a3 | 2772 | { |
1c9805a3 SH |
2773 | Coroutine *co; |
2774 | RwCo rwco = { | |
2775 | .bs = bs, | |
775aa8b6 | 2776 | .offset = offset, |
8d3b1a2d | 2777 | .qiov = qiov, |
1c9805a3 SH |
2778 | .is_write = is_write, |
2779 | .ret = NOT_DONE, | |
4105eaaa | 2780 | .flags = flags, |
1c9805a3 | 2781 | }; |
e7a8a783 | 2782 | |
498e386c ZYW |
2783 | /** |
2784 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2785 | * will not fire; so the I/O throttling function has to be disabled here | |
2786 | * if it has been enabled. | |
2787 | */ | |
2788 | if (bs->io_limits_enabled) { | |
2789 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2790 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2791 | bdrv_io_limits_disable(bs); | |
2792 | } | |
2793 | ||
1c9805a3 SH |
2794 | if (qemu_in_coroutine()) { |
2795 | /* Fast-path if already in coroutine context */ | |
2796 | bdrv_rw_co_entry(&rwco); | |
2797 | } else { | |
2572b37a SH |
2798 | AioContext *aio_context = bdrv_get_aio_context(bs); |
2799 | ||
1c9805a3 SH |
2800 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
2801 | qemu_coroutine_enter(co, &rwco); | |
2802 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 2803 | aio_poll(aio_context, true); |
1c9805a3 SH |
2804 | } |
2805 | } | |
2806 | return rwco.ret; | |
2807 | } | |
b338082b | 2808 | |
8d3b1a2d KW |
2809 | /* |
2810 | * Process a synchronous request using coroutines | |
2811 | */ | |
2812 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
4105eaaa | 2813 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
8d3b1a2d KW |
2814 | { |
2815 | QEMUIOVector qiov; | |
2816 | struct iovec iov = { | |
2817 | .iov_base = (void *)buf, | |
2818 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2819 | }; | |
2820 | ||
da15ee51 KW |
2821 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
2822 | return -EINVAL; | |
2823 | } | |
2824 | ||
8d3b1a2d | 2825 | qemu_iovec_init_external(&qiov, &iov, 1); |
775aa8b6 KW |
2826 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
2827 | &qiov, is_write, flags); | |
8d3b1a2d KW |
2828 | } |
2829 | ||
1c9805a3 SH |
2830 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2831 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2832 | uint8_t *buf, int nb_sectors) | |
2833 | { | |
4105eaaa | 2834 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
fc01f7e7 FB |
2835 | } |
2836 | ||
07d27a44 MA |
2837 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2838 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2839 | uint8_t *buf, int nb_sectors) | |
2840 | { | |
2841 | bool enabled; | |
2842 | int ret; | |
2843 | ||
2844 | enabled = bs->io_limits_enabled; | |
2845 | bs->io_limits_enabled = false; | |
4e7395e8 | 2846 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
07d27a44 MA |
2847 | bs->io_limits_enabled = enabled; |
2848 | return ret; | |
2849 | } | |
2850 | ||
5fafdf24 | 2851 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2852 | -EIO generic I/O error (may happen for all errors) |
2853 | -ENOMEDIUM No media inserted. | |
2854 | -EINVAL Invalid sector number or nb_sectors | |
2855 | -EACCES Trying to write a read-only device | |
2856 | */ | |
5fafdf24 | 2857 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2858 | const uint8_t *buf, int nb_sectors) |
2859 | { | |
4105eaaa | 2860 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
83f64091 FB |
2861 | } |
2862 | ||
aa7bfbff PL |
2863 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
2864 | int nb_sectors, BdrvRequestFlags flags) | |
4105eaaa PL |
2865 | { |
2866 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, | |
aa7bfbff | 2867 | BDRV_REQ_ZERO_WRITE | flags); |
8d3b1a2d KW |
2868 | } |
2869 | ||
d75cbb5e PL |
2870 | /* |
2871 | * Completely zero out a block device with the help of bdrv_write_zeroes. | |
2872 | * The operation is sped up by checking the block status and only writing | |
2873 | * zeroes to the device if they currently do not return zeroes. Optional | |
2874 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). | |
2875 | * | |
2876 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). | |
2877 | */ | |
2878 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) | |
2879 | { | |
d32f7c10 | 2880 | int64_t target_sectors, ret, nb_sectors, sector_num = 0; |
d75cbb5e PL |
2881 | int n; |
2882 | ||
d32f7c10 MA |
2883 | target_sectors = bdrv_nb_sectors(bs); |
2884 | if (target_sectors < 0) { | |
2885 | return target_sectors; | |
9ce10c0b | 2886 | } |
9ce10c0b | 2887 | |
d75cbb5e | 2888 | for (;;) { |
d32f7c10 | 2889 | nb_sectors = target_sectors - sector_num; |
d75cbb5e PL |
2890 | if (nb_sectors <= 0) { |
2891 | return 0; | |
2892 | } | |
2893 | if (nb_sectors > INT_MAX) { | |
2894 | nb_sectors = INT_MAX; | |
2895 | } | |
2896 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); | |
3d94ce60 PL |
2897 | if (ret < 0) { |
2898 | error_report("error getting block status at sector %" PRId64 ": %s", | |
2899 | sector_num, strerror(-ret)); | |
2900 | return ret; | |
2901 | } | |
d75cbb5e PL |
2902 | if (ret & BDRV_BLOCK_ZERO) { |
2903 | sector_num += n; | |
2904 | continue; | |
2905 | } | |
2906 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); | |
2907 | if (ret < 0) { | |
2908 | error_report("error writing zeroes at sector %" PRId64 ": %s", | |
2909 | sector_num, strerror(-ret)); | |
2910 | return ret; | |
2911 | } | |
2912 | sector_num += n; | |
2913 | } | |
2914 | } | |
2915 | ||
a3ef6571 | 2916 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
83f64091 | 2917 | { |
a3ef6571 KW |
2918 | QEMUIOVector qiov; |
2919 | struct iovec iov = { | |
2920 | .iov_base = (void *)buf, | |
2921 | .iov_len = bytes, | |
2922 | }; | |
9a8c4cce | 2923 | int ret; |
83f64091 | 2924 | |
a3ef6571 KW |
2925 | if (bytes < 0) { |
2926 | return -EINVAL; | |
83f64091 FB |
2927 | } |
2928 | ||
a3ef6571 KW |
2929 | qemu_iovec_init_external(&qiov, &iov, 1); |
2930 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); | |
2931 | if (ret < 0) { | |
2932 | return ret; | |
83f64091 | 2933 | } |
a3ef6571 KW |
2934 | |
2935 | return bytes; | |
83f64091 FB |
2936 | } |
2937 | ||
8d3b1a2d | 2938 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2939 | { |
9a8c4cce | 2940 | int ret; |
83f64091 | 2941 | |
8407d5d7 KW |
2942 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
2943 | if (ret < 0) { | |
2944 | return ret; | |
83f64091 FB |
2945 | } |
2946 | ||
8d3b1a2d KW |
2947 | return qiov->size; |
2948 | } | |
2949 | ||
2950 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
8407d5d7 | 2951 | const void *buf, int bytes) |
8d3b1a2d KW |
2952 | { |
2953 | QEMUIOVector qiov; | |
2954 | struct iovec iov = { | |
2955 | .iov_base = (void *) buf, | |
8407d5d7 | 2956 | .iov_len = bytes, |
8d3b1a2d KW |
2957 | }; |
2958 | ||
8407d5d7 KW |
2959 | if (bytes < 0) { |
2960 | return -EINVAL; | |
2961 | } | |
2962 | ||
8d3b1a2d KW |
2963 | qemu_iovec_init_external(&qiov, &iov, 1); |
2964 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2965 | } |
83f64091 | 2966 | |
f08145fe KW |
2967 | /* |
2968 | * Writes to the file and ensures that no writes are reordered across this | |
2969 | * request (acts as a barrier) | |
2970 | * | |
2971 | * Returns 0 on success, -errno in error cases. | |
2972 | */ | |
2973 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2974 | const void *buf, int count) | |
2975 | { | |
2976 | int ret; | |
2977 | ||
2978 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2979 | if (ret < 0) { | |
2980 | return ret; | |
2981 | } | |
2982 | ||
f05fa4ad PB |
2983 | /* No flush needed for cache modes that already do it */ |
2984 | if (bs->enable_write_cache) { | |
f08145fe KW |
2985 | bdrv_flush(bs); |
2986 | } | |
2987 | ||
2988 | return 0; | |
2989 | } | |
2990 | ||
470c0504 | 2991 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2992 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2993 | { | |
2994 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2995 | * their read buffer while the operation is in progress do not end up | |
2996 | * modifying the image file. This is critical for zero-copy guest I/O | |
2997 | * where anything might happen inside guest memory. | |
2998 | */ | |
2999 | void *bounce_buffer; | |
3000 | ||
79c053bd | 3001 | BlockDriver *drv = bs->drv; |
ab185921 SH |
3002 | struct iovec iov; |
3003 | QEMUIOVector bounce_qiov; | |
3004 | int64_t cluster_sector_num; | |
3005 | int cluster_nb_sectors; | |
3006 | size_t skip_bytes; | |
3007 | int ret; | |
3008 | ||
3009 | /* Cover entire cluster so no additional backing file I/O is required when | |
3010 | * allocating cluster in the image file. | |
3011 | */ | |
343bded4 PB |
3012 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
3013 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 3014 | |
470c0504 SH |
3015 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
3016 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
3017 | |
3018 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
857d4f46 KW |
3019 | iov.iov_base = bounce_buffer = qemu_try_blockalign(bs, iov.iov_len); |
3020 | if (bounce_buffer == NULL) { | |
3021 | ret = -ENOMEM; | |
3022 | goto err; | |
3023 | } | |
3024 | ||
ab185921 SH |
3025 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
3026 | ||
79c053bd SH |
3027 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
3028 | &bounce_qiov); | |
ab185921 SH |
3029 | if (ret < 0) { |
3030 | goto err; | |
3031 | } | |
3032 | ||
79c053bd SH |
3033 | if (drv->bdrv_co_write_zeroes && |
3034 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 | 3035 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
aa7bfbff | 3036 | cluster_nb_sectors, 0); |
79c053bd | 3037 | } else { |
f05fa4ad PB |
3038 | /* This does not change the data on the disk, it is not necessary |
3039 | * to flush even in cache=writethrough mode. | |
3040 | */ | |
79c053bd | 3041 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 3042 | &bounce_qiov); |
79c053bd SH |
3043 | } |
3044 | ||
ab185921 SH |
3045 | if (ret < 0) { |
3046 | /* It might be okay to ignore write errors for guest requests. If this | |
3047 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
3048 | * Simply report it in all cases. | |
3049 | */ | |
3050 | goto err; | |
3051 | } | |
3052 | ||
3053 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
3054 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
3055 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
3056 | |
3057 | err: | |
3058 | qemu_vfree(bounce_buffer); | |
3059 | return ret; | |
3060 | } | |
3061 | ||
c5fbe571 | 3062 | /* |
d0c7f642 KW |
3063 | * Forwards an already correctly aligned request to the BlockDriver. This |
3064 | * handles copy on read and zeroing after EOF; any other features must be | |
3065 | * implemented by the caller. | |
c5fbe571 | 3066 | */ |
d0c7f642 | 3067 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
65afd211 | 3068 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
ec746e10 | 3069 | int64_t align, QEMUIOVector *qiov, int flags) |
da1fa91d KW |
3070 | { |
3071 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 3072 | int ret; |
da1fa91d | 3073 | |
d0c7f642 KW |
3074 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3075 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
da1fa91d | 3076 | |
d0c7f642 KW |
3077 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3078 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3079 | assert(!qiov || bytes == qiov->size); |
d0c7f642 KW |
3080 | |
3081 | /* Handle Copy on Read and associated serialisation */ | |
470c0504 | 3082 | if (flags & BDRV_REQ_COPY_ON_READ) { |
7327145f KW |
3083 | /* If we touch the same cluster it counts as an overlap. This |
3084 | * guarantees that allocating writes will be serialized and not race | |
3085 | * with each other for the same cluster. For example, in copy-on-read | |
3086 | * it ensures that the CoR read and write operations are atomic and | |
3087 | * guest writes cannot interleave between them. */ | |
3088 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); | |
470c0504 SH |
3089 | } |
3090 | ||
2dbafdc0 | 3091 | wait_serialising_requests(req); |
f4658285 | 3092 | |
470c0504 | 3093 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
3094 | int pnum; |
3095 | ||
bdad13b9 | 3096 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
ab185921 SH |
3097 | if (ret < 0) { |
3098 | goto out; | |
3099 | } | |
3100 | ||
3101 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 3102 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
3103 | goto out; |
3104 | } | |
3105 | } | |
3106 | ||
d0c7f642 | 3107 | /* Forward the request to the BlockDriver */ |
893a8f62 MK |
3108 | if (!(bs->zero_beyond_eof && bs->growable)) { |
3109 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
3110 | } else { | |
3111 | /* Read zeros after EOF of growable BDSes */ | |
4049082c | 3112 | int64_t total_sectors, max_nb_sectors; |
893a8f62 | 3113 | |
4049082c MA |
3114 | total_sectors = bdrv_nb_sectors(bs); |
3115 | if (total_sectors < 0) { | |
3116 | ret = total_sectors; | |
893a8f62 MK |
3117 | goto out; |
3118 | } | |
3119 | ||
5f5bcd80 KW |
3120 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
3121 | align >> BDRV_SECTOR_BITS); | |
893a8f62 | 3122 | if (max_nb_sectors > 0) { |
33f461e0 KW |
3123 | QEMUIOVector local_qiov; |
3124 | size_t local_sectors; | |
3125 | ||
3126 | max_nb_sectors = MIN(max_nb_sectors, SIZE_MAX / BDRV_SECTOR_BITS); | |
3127 | local_sectors = MIN(max_nb_sectors, nb_sectors); | |
3128 | ||
3129 | qemu_iovec_init(&local_qiov, qiov->niov); | |
3130 | qemu_iovec_concat(&local_qiov, qiov, 0, | |
3131 | local_sectors * BDRV_SECTOR_SIZE); | |
3132 | ||
3133 | ret = drv->bdrv_co_readv(bs, sector_num, local_sectors, | |
3134 | &local_qiov); | |
3135 | ||
3136 | qemu_iovec_destroy(&local_qiov); | |
893a8f62 MK |
3137 | } else { |
3138 | ret = 0; | |
3139 | } | |
3140 | ||
3141 | /* Reading beyond end of file is supposed to produce zeroes */ | |
3142 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { | |
3143 | uint64_t offset = MAX(0, total_sectors - sector_num); | |
3144 | uint64_t bytes = (sector_num + nb_sectors - offset) * | |
3145 | BDRV_SECTOR_SIZE; | |
3146 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); | |
3147 | } | |
3148 | } | |
ab185921 SH |
3149 | |
3150 | out: | |
dbffbdcf | 3151 | return ret; |
da1fa91d KW |
3152 | } |
3153 | ||
d0c7f642 KW |
3154 | /* |
3155 | * Handle a read request in coroutine context | |
3156 | */ | |
1b0288ae KW |
3157 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
3158 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
d0c7f642 KW |
3159 | BdrvRequestFlags flags) |
3160 | { | |
3161 | BlockDriver *drv = bs->drv; | |
65afd211 KW |
3162 | BdrvTrackedRequest req; |
3163 | ||
1b0288ae KW |
3164 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3165 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3166 | uint8_t *head_buf = NULL; | |
3167 | uint8_t *tail_buf = NULL; | |
3168 | QEMUIOVector local_qiov; | |
3169 | bool use_local_qiov = false; | |
d0c7f642 KW |
3170 | int ret; |
3171 | ||
3172 | if (!drv) { | |
3173 | return -ENOMEDIUM; | |
3174 | } | |
1b0288ae | 3175 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
d0c7f642 KW |
3176 | return -EIO; |
3177 | } | |
3178 | ||
3179 | if (bs->copy_on_read) { | |
3180 | flags |= BDRV_REQ_COPY_ON_READ; | |
3181 | } | |
3182 | ||
3183 | /* throttling disk I/O */ | |
3184 | if (bs->io_limits_enabled) { | |
d5103588 | 3185 | bdrv_io_limits_intercept(bs, bytes, false); |
1b0288ae KW |
3186 | } |
3187 | ||
3188 | /* Align read if necessary by padding qiov */ | |
3189 | if (offset & (align - 1)) { | |
3190 | head_buf = qemu_blockalign(bs, align); | |
3191 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3192 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3193 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3194 | use_local_qiov = true; | |
3195 | ||
3196 | bytes += offset & (align - 1); | |
3197 | offset = offset & ~(align - 1); | |
3198 | } | |
3199 | ||
3200 | if ((offset + bytes) & (align - 1)) { | |
3201 | if (!use_local_qiov) { | |
3202 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3203 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3204 | use_local_qiov = true; | |
3205 | } | |
3206 | tail_buf = qemu_blockalign(bs, align); | |
3207 | qemu_iovec_add(&local_qiov, tail_buf, | |
3208 | align - ((offset + bytes) & (align - 1))); | |
3209 | ||
3210 | bytes = ROUND_UP(bytes, align); | |
3211 | } | |
3212 | ||
65afd211 | 3213 | tracked_request_begin(&req, bs, offset, bytes, false); |
ec746e10 | 3214 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
1b0288ae KW |
3215 | use_local_qiov ? &local_qiov : qiov, |
3216 | flags); | |
65afd211 | 3217 | tracked_request_end(&req); |
1b0288ae KW |
3218 | |
3219 | if (use_local_qiov) { | |
3220 | qemu_iovec_destroy(&local_qiov); | |
3221 | qemu_vfree(head_buf); | |
3222 | qemu_vfree(tail_buf); | |
d0c7f642 KW |
3223 | } |
3224 | ||
d0c7f642 KW |
3225 | return ret; |
3226 | } | |
3227 | ||
1b0288ae KW |
3228 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
3229 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3230 | BdrvRequestFlags flags) | |
3231 | { | |
3232 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { | |
3233 | return -EINVAL; | |
3234 | } | |
3235 | ||
3236 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, | |
3237 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3238 | } | |
3239 | ||
c5fbe571 | 3240 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
3241 | int nb_sectors, QEMUIOVector *qiov) |
3242 | { | |
c5fbe571 | 3243 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 3244 | |
470c0504 SH |
3245 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
3246 | } | |
3247 | ||
3248 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
3249 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
3250 | { | |
3251 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
3252 | ||
3253 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
3254 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
3255 | } |
3256 | ||
c31cb707 PL |
3257 | /* if no limit is specified in the BlockLimits use a default |
3258 | * of 32768 512-byte sectors (16 MiB) per request. | |
3259 | */ | |
3260 | #define MAX_WRITE_ZEROES_DEFAULT 32768 | |
3261 | ||
f08f2dda | 3262 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 3263 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
f08f2dda SH |
3264 | { |
3265 | BlockDriver *drv = bs->drv; | |
3266 | QEMUIOVector qiov; | |
c31cb707 PL |
3267 | struct iovec iov = {0}; |
3268 | int ret = 0; | |
f08f2dda | 3269 | |
c31cb707 PL |
3270 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
3271 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; | |
621f0589 | 3272 | |
c31cb707 PL |
3273 | while (nb_sectors > 0 && !ret) { |
3274 | int num = nb_sectors; | |
3275 | ||
b8d71c09 PB |
3276 | /* Align request. Block drivers can expect the "bulk" of the request |
3277 | * to be aligned. | |
3278 | */ | |
3279 | if (bs->bl.write_zeroes_alignment | |
3280 | && num > bs->bl.write_zeroes_alignment) { | |
3281 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { | |
3282 | /* Make a small request up to the first aligned sector. */ | |
c31cb707 | 3283 | num = bs->bl.write_zeroes_alignment; |
b8d71c09 PB |
3284 | num -= sector_num % bs->bl.write_zeroes_alignment; |
3285 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { | |
3286 | /* Shorten the request to the last aligned sector. num cannot | |
3287 | * underflow because num > bs->bl.write_zeroes_alignment. | |
3288 | */ | |
3289 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; | |
c31cb707 | 3290 | } |
621f0589 | 3291 | } |
f08f2dda | 3292 | |
c31cb707 PL |
3293 | /* limit request size */ |
3294 | if (num > max_write_zeroes) { | |
3295 | num = max_write_zeroes; | |
3296 | } | |
3297 | ||
3298 | ret = -ENOTSUP; | |
3299 | /* First try the efficient write zeroes operation */ | |
3300 | if (drv->bdrv_co_write_zeroes) { | |
3301 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); | |
3302 | } | |
3303 | ||
3304 | if (ret == -ENOTSUP) { | |
3305 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
3306 | iov.iov_len = num * BDRV_SECTOR_SIZE; | |
3307 | if (iov.iov_base == NULL) { | |
857d4f46 KW |
3308 | iov.iov_base = qemu_try_blockalign(bs, num * BDRV_SECTOR_SIZE); |
3309 | if (iov.iov_base == NULL) { | |
3310 | ret = -ENOMEM; | |
3311 | goto fail; | |
3312 | } | |
b8d71c09 | 3313 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); |
c31cb707 PL |
3314 | } |
3315 | qemu_iovec_init_external(&qiov, &iov, 1); | |
f08f2dda | 3316 | |
c31cb707 | 3317 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
b8d71c09 PB |
3318 | |
3319 | /* Keep bounce buffer around if it is big enough for all | |
3320 | * all future requests. | |
3321 | */ | |
3322 | if (num < max_write_zeroes) { | |
3323 | qemu_vfree(iov.iov_base); | |
3324 | iov.iov_base = NULL; | |
3325 | } | |
c31cb707 PL |
3326 | } |
3327 | ||
3328 | sector_num += num; | |
3329 | nb_sectors -= num; | |
3330 | } | |
f08f2dda | 3331 | |
857d4f46 | 3332 | fail: |
f08f2dda SH |
3333 | qemu_vfree(iov.iov_base); |
3334 | return ret; | |
3335 | } | |
3336 | ||
c5fbe571 | 3337 | /* |
b404f720 | 3338 | * Forwards an already correctly aligned write request to the BlockDriver. |
c5fbe571 | 3339 | */ |
b404f720 | 3340 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
65afd211 KW |
3341 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
3342 | QEMUIOVector *qiov, int flags) | |
c5fbe571 SH |
3343 | { |
3344 | BlockDriver *drv = bs->drv; | |
28de2dcd | 3345 | bool waited; |
6b7cb247 | 3346 | int ret; |
da1fa91d | 3347 | |
b404f720 KW |
3348 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
3349 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; | |
f4658285 | 3350 | |
b404f720 KW |
3351 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
3352 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
8eb029c2 | 3353 | assert(!qiov || bytes == qiov->size); |
cc0681c4 | 3354 | |
28de2dcd KW |
3355 | waited = wait_serialising_requests(req); |
3356 | assert(!waited || !req->serialising); | |
af91f9a7 KW |
3357 | assert(req->overlap_offset <= offset); |
3358 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); | |
244eadef | 3359 | |
65afd211 | 3360 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
d616b224 | 3361 | |
465bee1d PL |
3362 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
3363 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && | |
3364 | qemu_iovec_is_zero(qiov)) { | |
3365 | flags |= BDRV_REQ_ZERO_WRITE; | |
3366 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { | |
3367 | flags |= BDRV_REQ_MAY_UNMAP; | |
3368 | } | |
3369 | } | |
3370 | ||
d616b224 SH |
3371 | if (ret < 0) { |
3372 | /* Do nothing, write notifier decided to fail this request */ | |
3373 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
9e1cb96d | 3374 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
aa7bfbff | 3375 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3376 | } else { |
9e1cb96d | 3377 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
f08f2dda SH |
3378 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
3379 | } | |
9e1cb96d | 3380 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
6b7cb247 | 3381 | |
f05fa4ad PB |
3382 | if (ret == 0 && !bs->enable_write_cache) { |
3383 | ret = bdrv_co_flush(bs); | |
3384 | } | |
3385 | ||
e4654d2d | 3386 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d | 3387 | |
5366d0c8 | 3388 | block_acct_highest_sector(&bs->stats, sector_num, nb_sectors); |
5e5a94b6 | 3389 | |
df2a6f29 PB |
3390 | if (bs->growable && ret >= 0) { |
3391 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); | |
3392 | } | |
da1fa91d | 3393 | |
6b7cb247 | 3394 | return ret; |
da1fa91d KW |
3395 | } |
3396 | ||
b404f720 KW |
3397 | /* |
3398 | * Handle a write request in coroutine context | |
3399 | */ | |
6601553e KW |
3400 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
3401 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, | |
b404f720 KW |
3402 | BdrvRequestFlags flags) |
3403 | { | |
65afd211 | 3404 | BdrvTrackedRequest req; |
3b8242e0 KW |
3405 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
3406 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); | |
3407 | uint8_t *head_buf = NULL; | |
3408 | uint8_t *tail_buf = NULL; | |
3409 | QEMUIOVector local_qiov; | |
3410 | bool use_local_qiov = false; | |
b404f720 KW |
3411 | int ret; |
3412 | ||
3413 | if (!bs->drv) { | |
3414 | return -ENOMEDIUM; | |
3415 | } | |
3416 | if (bs->read_only) { | |
3417 | return -EACCES; | |
3418 | } | |
6601553e | 3419 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
b404f720 KW |
3420 | return -EIO; |
3421 | } | |
3422 | ||
b404f720 KW |
3423 | /* throttling disk I/O */ |
3424 | if (bs->io_limits_enabled) { | |
d5103588 | 3425 | bdrv_io_limits_intercept(bs, bytes, true); |
b404f720 KW |
3426 | } |
3427 | ||
3b8242e0 KW |
3428 | /* |
3429 | * Align write if necessary by performing a read-modify-write cycle. | |
3430 | * Pad qiov with the read parts and be sure to have a tracked request not | |
3431 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. | |
3432 | */ | |
65afd211 | 3433 | tracked_request_begin(&req, bs, offset, bytes, true); |
3b8242e0 KW |
3434 | |
3435 | if (offset & (align - 1)) { | |
3436 | QEMUIOVector head_qiov; | |
3437 | struct iovec head_iov; | |
3438 | ||
3439 | mark_request_serialising(&req, align); | |
3440 | wait_serialising_requests(&req); | |
3441 | ||
3442 | head_buf = qemu_blockalign(bs, align); | |
3443 | head_iov = (struct iovec) { | |
3444 | .iov_base = head_buf, | |
3445 | .iov_len = align, | |
3446 | }; | |
3447 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); | |
3448 | ||
9e1cb96d | 3449 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
3b8242e0 KW |
3450 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
3451 | align, &head_qiov, 0); | |
3452 | if (ret < 0) { | |
3453 | goto fail; | |
3454 | } | |
9e1cb96d | 3455 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
3b8242e0 KW |
3456 | |
3457 | qemu_iovec_init(&local_qiov, qiov->niov + 2); | |
3458 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); | |
3459 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3460 | use_local_qiov = true; | |
3461 | ||
3462 | bytes += offset & (align - 1); | |
3463 | offset = offset & ~(align - 1); | |
3464 | } | |
3465 | ||
3466 | if ((offset + bytes) & (align - 1)) { | |
3467 | QEMUIOVector tail_qiov; | |
3468 | struct iovec tail_iov; | |
3469 | size_t tail_bytes; | |
28de2dcd | 3470 | bool waited; |
3b8242e0 KW |
3471 | |
3472 | mark_request_serialising(&req, align); | |
28de2dcd KW |
3473 | waited = wait_serialising_requests(&req); |
3474 | assert(!waited || !use_local_qiov); | |
3b8242e0 KW |
3475 | |
3476 | tail_buf = qemu_blockalign(bs, align); | |
3477 | tail_iov = (struct iovec) { | |
3478 | .iov_base = tail_buf, | |
3479 | .iov_len = align, | |
3480 | }; | |
3481 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); | |
3482 | ||
9e1cb96d | 3483 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
3b8242e0 KW |
3484 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
3485 | align, &tail_qiov, 0); | |
3486 | if (ret < 0) { | |
3487 | goto fail; | |
3488 | } | |
9e1cb96d | 3489 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
3b8242e0 KW |
3490 | |
3491 | if (!use_local_qiov) { | |
3492 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
3493 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); | |
3494 | use_local_qiov = true; | |
3495 | } | |
3496 | ||
3497 | tail_bytes = (offset + bytes) & (align - 1); | |
3498 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); | |
3499 | ||
3500 | bytes = ROUND_UP(bytes, align); | |
3501 | } | |
3502 | ||
3503 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, | |
3504 | use_local_qiov ? &local_qiov : qiov, | |
3505 | flags); | |
3506 | ||
3507 | fail: | |
65afd211 | 3508 | tracked_request_end(&req); |
b404f720 | 3509 | |
3b8242e0 KW |
3510 | if (use_local_qiov) { |
3511 | qemu_iovec_destroy(&local_qiov); | |
3b8242e0 | 3512 | } |
99c4a85c KW |
3513 | qemu_vfree(head_buf); |
3514 | qemu_vfree(tail_buf); | |
3b8242e0 | 3515 | |
b404f720 KW |
3516 | return ret; |
3517 | } | |
3518 | ||
6601553e KW |
3519 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
3520 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, | |
3521 | BdrvRequestFlags flags) | |
3522 | { | |
3523 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { | |
3524 | return -EINVAL; | |
3525 | } | |
3526 | ||
3527 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, | |
3528 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); | |
3529 | } | |
3530 | ||
c5fbe571 SH |
3531 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
3532 | int nb_sectors, QEMUIOVector *qiov) | |
3533 | { | |
3534 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
3535 | ||
f08f2dda SH |
3536 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
3537 | } | |
3538 | ||
3539 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
aa7bfbff PL |
3540 | int64_t sector_num, int nb_sectors, |
3541 | BdrvRequestFlags flags) | |
f08f2dda | 3542 | { |
94d6ff21 | 3543 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
f08f2dda | 3544 | |
d32f35cb PL |
3545 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
3546 | flags &= ~BDRV_REQ_MAY_UNMAP; | |
3547 | } | |
3548 | ||
f08f2dda | 3549 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
aa7bfbff | 3550 | BDRV_REQ_ZERO_WRITE | flags); |
c5fbe571 SH |
3551 | } |
3552 | ||
83f64091 FB |
3553 | /** |
3554 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
3555 | */ | |
3556 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
3557 | { | |
3558 | BlockDriver *drv = bs->drv; | |
51762288 | 3559 | int ret; |
83f64091 | 3560 | if (!drv) |
19cb3738 | 3561 | return -ENOMEDIUM; |
83f64091 FB |
3562 | if (!drv->bdrv_truncate) |
3563 | return -ENOTSUP; | |
59f2689d NS |
3564 | if (bs->read_only) |
3565 | return -EACCES; | |
9c75e168 | 3566 | |
51762288 SH |
3567 | ret = drv->bdrv_truncate(bs, offset); |
3568 | if (ret == 0) { | |
3569 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 3570 | bdrv_dev_resize_cb(bs); |
51762288 SH |
3571 | } |
3572 | return ret; | |
83f64091 FB |
3573 | } |
3574 | ||
4a1d5e1f FZ |
3575 | /** |
3576 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
3577 | * allocated space. Return < 0 if error or unknown. | |
3578 | */ | |
3579 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
3580 | { | |
3581 | BlockDriver *drv = bs->drv; | |
3582 | if (!drv) { | |
3583 | return -ENOMEDIUM; | |
3584 | } | |
3585 | if (drv->bdrv_get_allocated_file_size) { | |
3586 | return drv->bdrv_get_allocated_file_size(bs); | |
3587 | } | |
3588 | if (bs->file) { | |
3589 | return bdrv_get_allocated_file_size(bs->file); | |
3590 | } | |
3591 | return -ENOTSUP; | |
3592 | } | |
3593 | ||
83f64091 | 3594 | /** |
65a9bb25 | 3595 | * Return number of sectors on success, -errno on error. |
83f64091 | 3596 | */ |
65a9bb25 | 3597 | int64_t bdrv_nb_sectors(BlockDriverState *bs) |
83f64091 FB |
3598 | { |
3599 | BlockDriver *drv = bs->drv; | |
65a9bb25 | 3600 | |
83f64091 | 3601 | if (!drv) |
19cb3738 | 3602 | return -ENOMEDIUM; |
51762288 | 3603 | |
b94a2610 KW |
3604 | if (drv->has_variable_length) { |
3605 | int ret = refresh_total_sectors(bs, bs->total_sectors); | |
3606 | if (ret < 0) { | |
3607 | return ret; | |
46a4e4e6 | 3608 | } |
83f64091 | 3609 | } |
65a9bb25 MA |
3610 | return bs->total_sectors; |
3611 | } | |
3612 | ||
3613 | /** | |
3614 | * Return length in bytes on success, -errno on error. | |
3615 | * The length is always a multiple of BDRV_SECTOR_SIZE. | |
3616 | */ | |
3617 | int64_t bdrv_getlength(BlockDriverState *bs) | |
3618 | { | |
3619 | int64_t ret = bdrv_nb_sectors(bs); | |
3620 | ||
3621 | return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; | |
fc01f7e7 FB |
3622 | } |
3623 | ||
19cb3738 | 3624 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 3625 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 3626 | { |
65a9bb25 MA |
3627 | int64_t nb_sectors = bdrv_nb_sectors(bs); |
3628 | ||
3629 | *nb_sectors_ptr = nb_sectors < 0 ? 0 : nb_sectors; | |
fc01f7e7 | 3630 | } |
cf98951b | 3631 | |
ff06f5f3 PB |
3632 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
3633 | BlockdevOnError on_write_error) | |
abd7f68d MA |
3634 | { |
3635 | bs->on_read_error = on_read_error; | |
3636 | bs->on_write_error = on_write_error; | |
3637 | } | |
3638 | ||
1ceee0d5 | 3639 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
3640 | { |
3641 | return is_read ? bs->on_read_error : bs->on_write_error; | |
3642 | } | |
3643 | ||
3e1caa5f PB |
3644 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
3645 | { | |
3646 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
3647 | ||
3648 | switch (on_err) { | |
3649 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
a589569f WX |
3650 | return (error == ENOSPC) ? |
3651 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; | |
3e1caa5f | 3652 | case BLOCKDEV_ON_ERROR_STOP: |
a589569f | 3653 | return BLOCK_ERROR_ACTION_STOP; |
3e1caa5f | 3654 | case BLOCKDEV_ON_ERROR_REPORT: |
a589569f | 3655 | return BLOCK_ERROR_ACTION_REPORT; |
3e1caa5f | 3656 | case BLOCKDEV_ON_ERROR_IGNORE: |
a589569f | 3657 | return BLOCK_ERROR_ACTION_IGNORE; |
3e1caa5f PB |
3658 | default: |
3659 | abort(); | |
3660 | } | |
3661 | } | |
3662 | ||
c7c2ff0c LC |
3663 | static void send_qmp_error_event(BlockDriverState *bs, |
3664 | BlockErrorAction action, | |
3665 | bool is_read, int error) | |
3666 | { | |
3667 | BlockErrorAction ac; | |
3668 | ||
3669 | ac = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE; | |
3670 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), ac, action, | |
3671 | bdrv_iostatus_is_enabled(bs), | |
624ff573 LC |
3672 | error == ENOSPC, strerror(error), |
3673 | &error_abort); | |
c7c2ff0c LC |
3674 | } |
3675 | ||
3e1caa5f PB |
3676 | /* This is done by device models because, while the block layer knows |
3677 | * about the error, it does not know whether an operation comes from | |
3678 | * the device or the block layer (from a job, for example). | |
3679 | */ | |
3680 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
3681 | bool is_read, int error) | |
3682 | { | |
3683 | assert(error >= 0); | |
2bd3bce8 | 3684 | |
a589569f | 3685 | if (action == BLOCK_ERROR_ACTION_STOP) { |
2bd3bce8 PB |
3686 | /* First set the iostatus, so that "info block" returns an iostatus |
3687 | * that matches the events raised so far (an additional error iostatus | |
3688 | * is fine, but not a lost one). | |
3689 | */ | |
3e1caa5f | 3690 | bdrv_iostatus_set_err(bs, error); |
2bd3bce8 PB |
3691 | |
3692 | /* Then raise the request to stop the VM and the event. | |
3693 | * qemu_system_vmstop_request_prepare has two effects. First, | |
3694 | * it ensures that the STOP event always comes after the | |
3695 | * BLOCK_IO_ERROR event. Second, it ensures that even if management | |
3696 | * can observe the STOP event and do a "cont" before the STOP | |
3697 | * event is issued, the VM will not stop. In this case, vm_start() | |
3698 | * also ensures that the STOP/RESUME pair of events is emitted. | |
3699 | */ | |
3700 | qemu_system_vmstop_request_prepare(); | |
c7c2ff0c | 3701 | send_qmp_error_event(bs, action, is_read, error); |
2bd3bce8 PB |
3702 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
3703 | } else { | |
c7c2ff0c | 3704 | send_qmp_error_event(bs, action, is_read, error); |
3e1caa5f PB |
3705 | } |
3706 | } | |
3707 | ||
b338082b FB |
3708 | int bdrv_is_read_only(BlockDriverState *bs) |
3709 | { | |
3710 | return bs->read_only; | |
3711 | } | |
3712 | ||
985a03b0 TS |
3713 | int bdrv_is_sg(BlockDriverState *bs) |
3714 | { | |
3715 | return bs->sg; | |
3716 | } | |
3717 | ||
e900a7b7 CH |
3718 | int bdrv_enable_write_cache(BlockDriverState *bs) |
3719 | { | |
3720 | return bs->enable_write_cache; | |
3721 | } | |
3722 | ||
425b0148 PB |
3723 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
3724 | { | |
3725 | bs->enable_write_cache = wce; | |
55b110f2 JC |
3726 | |
3727 | /* so a reopen() will preserve wce */ | |
3728 | if (wce) { | |
3729 | bs->open_flags |= BDRV_O_CACHE_WB; | |
3730 | } else { | |
3731 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
3732 | } | |
425b0148 PB |
3733 | } |
3734 | ||
ea2384d3 FB |
3735 | int bdrv_is_encrypted(BlockDriverState *bs) |
3736 | { | |
3737 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3738 | return 1; | |
3739 | return bs->encrypted; | |
3740 | } | |
3741 | ||
c0f4ce77 AL |
3742 | int bdrv_key_required(BlockDriverState *bs) |
3743 | { | |
3744 | BlockDriverState *backing_hd = bs->backing_hd; | |
3745 | ||
3746 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
3747 | return 1; | |
3748 | return (bs->encrypted && !bs->valid_key); | |
3749 | } | |
3750 | ||
ea2384d3 FB |
3751 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
3752 | { | |
3753 | int ret; | |
3754 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
3755 | ret = bdrv_set_key(bs->backing_hd, key); | |
3756 | if (ret < 0) | |
3757 | return ret; | |
3758 | if (!bs->encrypted) | |
3759 | return 0; | |
3760 | } | |
fd04a2ae SH |
3761 | if (!bs->encrypted) { |
3762 | return -EINVAL; | |
3763 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
3764 | return -ENOMEDIUM; | |
3765 | } | |
c0f4ce77 | 3766 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
3767 | if (ret < 0) { |
3768 | bs->valid_key = 0; | |
3769 | } else if (!bs->valid_key) { | |
3770 | bs->valid_key = 1; | |
3771 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 3772 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 3773 | } |
c0f4ce77 | 3774 | return ret; |
ea2384d3 FB |
3775 | } |
3776 | ||
f8d6bba1 | 3777 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 3778 | { |
f8d6bba1 | 3779 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
3780 | } |
3781 | ||
ada42401 SH |
3782 | static int qsort_strcmp(const void *a, const void *b) |
3783 | { | |
3784 | return strcmp(a, b); | |
3785 | } | |
3786 | ||
5fafdf24 | 3787 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
3788 | void *opaque) |
3789 | { | |
3790 | BlockDriver *drv; | |
e855e4fb | 3791 | int count = 0; |
ada42401 | 3792 | int i; |
e855e4fb | 3793 | const char **formats = NULL; |
ea2384d3 | 3794 | |
8a22f02a | 3795 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
e855e4fb JC |
3796 | if (drv->format_name) { |
3797 | bool found = false; | |
3798 | int i = count; | |
3799 | while (formats && i && !found) { | |
3800 | found = !strcmp(formats[--i], drv->format_name); | |
3801 | } | |
3802 | ||
3803 | if (!found) { | |
5839e53b | 3804 | formats = g_renew(const char *, formats, count + 1); |
e855e4fb | 3805 | formats[count++] = drv->format_name; |
e855e4fb JC |
3806 | } |
3807 | } | |
ea2384d3 | 3808 | } |
ada42401 SH |
3809 | |
3810 | qsort(formats, count, sizeof(formats[0]), qsort_strcmp); | |
3811 | ||
3812 | for (i = 0; i < count; i++) { | |
3813 | it(opaque, formats[i]); | |
3814 | } | |
3815 | ||
e855e4fb | 3816 | g_free(formats); |
ea2384d3 FB |
3817 | } |
3818 | ||
dc364f4c | 3819 | /* This function is to find block backend bs */ |
b338082b FB |
3820 | BlockDriverState *bdrv_find(const char *name) |
3821 | { | |
3822 | BlockDriverState *bs; | |
3823 | ||
dc364f4c | 3824 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
1b7bdbc1 | 3825 | if (!strcmp(name, bs->device_name)) { |
b338082b | 3826 | return bs; |
1b7bdbc1 | 3827 | } |
b338082b FB |
3828 | } |
3829 | return NULL; | |
3830 | } | |
3831 | ||
dc364f4c BC |
3832 | /* This function is to find a node in the bs graph */ |
3833 | BlockDriverState *bdrv_find_node(const char *node_name) | |
3834 | { | |
3835 | BlockDriverState *bs; | |
3836 | ||
3837 | assert(node_name); | |
3838 | ||
3839 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3840 | if (!strcmp(node_name, bs->node_name)) { | |
3841 | return bs; | |
3842 | } | |
3843 | } | |
3844 | return NULL; | |
3845 | } | |
3846 | ||
c13163fb BC |
3847 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
3848 | BlockDeviceInfoList *bdrv_named_nodes_list(void) | |
3849 | { | |
3850 | BlockDeviceInfoList *list, *entry; | |
3851 | BlockDriverState *bs; | |
3852 | ||
3853 | list = NULL; | |
3854 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { | |
3855 | entry = g_malloc0(sizeof(*entry)); | |
3856 | entry->value = bdrv_block_device_info(bs); | |
3857 | entry->next = list; | |
3858 | list = entry; | |
3859 | } | |
3860 | ||
3861 | return list; | |
3862 | } | |
3863 | ||
12d3ba82 BC |
3864 | BlockDriverState *bdrv_lookup_bs(const char *device, |
3865 | const char *node_name, | |
3866 | Error **errp) | |
3867 | { | |
3868 | BlockDriverState *bs = NULL; | |
3869 | ||
12d3ba82 BC |
3870 | if (device) { |
3871 | bs = bdrv_find(device); | |
3872 | ||
dd67fa50 BC |
3873 | if (bs) { |
3874 | return bs; | |
12d3ba82 | 3875 | } |
12d3ba82 BC |
3876 | } |
3877 | ||
dd67fa50 BC |
3878 | if (node_name) { |
3879 | bs = bdrv_find_node(node_name); | |
12d3ba82 | 3880 | |
dd67fa50 BC |
3881 | if (bs) { |
3882 | return bs; | |
3883 | } | |
12d3ba82 BC |
3884 | } |
3885 | ||
dd67fa50 BC |
3886 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
3887 | device ? device : "", | |
3888 | node_name ? node_name : ""); | |
3889 | return NULL; | |
12d3ba82 BC |
3890 | } |
3891 | ||
5a6684d2 JC |
3892 | /* If 'base' is in the same chain as 'top', return true. Otherwise, |
3893 | * return false. If either argument is NULL, return false. */ | |
3894 | bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) | |
3895 | { | |
3896 | while (top && top != base) { | |
3897 | top = top->backing_hd; | |
3898 | } | |
3899 | ||
3900 | return top != NULL; | |
3901 | } | |
3902 | ||
2f399b0a MA |
3903 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
3904 | { | |
3905 | if (!bs) { | |
3906 | return QTAILQ_FIRST(&bdrv_states); | |
3907 | } | |
dc364f4c | 3908 | return QTAILQ_NEXT(bs, device_list); |
2f399b0a MA |
3909 | } |
3910 | ||
51de9760 | 3911 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
3912 | { |
3913 | BlockDriverState *bs; | |
3914 | ||
dc364f4c | 3915 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
51de9760 | 3916 | it(opaque, bs); |
81d0912d FB |
3917 | } |
3918 | } | |
3919 | ||
ea2384d3 FB |
3920 | const char *bdrv_get_device_name(BlockDriverState *bs) |
3921 | { | |
3922 | return bs->device_name; | |
3923 | } | |
3924 | ||
c8433287 MA |
3925 | int bdrv_get_flags(BlockDriverState *bs) |
3926 | { | |
3927 | return bs->open_flags; | |
3928 | } | |
3929 | ||
f0f0fdfe | 3930 | int bdrv_flush_all(void) |
c6ca28d6 AL |
3931 | { |
3932 | BlockDriverState *bs; | |
f0f0fdfe | 3933 | int result = 0; |
c6ca28d6 | 3934 | |
dc364f4c | 3935 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
3936 | AioContext *aio_context = bdrv_get_aio_context(bs); |
3937 | int ret; | |
3938 | ||
3939 | aio_context_acquire(aio_context); | |
3940 | ret = bdrv_flush(bs); | |
f0f0fdfe KW |
3941 | if (ret < 0 && !result) { |
3942 | result = ret; | |
3943 | } | |
ed78cda3 | 3944 | aio_context_release(aio_context); |
1b7bdbc1 | 3945 | } |
f0f0fdfe KW |
3946 | |
3947 | return result; | |
c6ca28d6 AL |
3948 | } |
3949 | ||
3ac21627 PL |
3950 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
3951 | { | |
3952 | return 1; | |
3953 | } | |
3954 | ||
f2feebbd KW |
3955 | int bdrv_has_zero_init(BlockDriverState *bs) |
3956 | { | |
3957 | assert(bs->drv); | |
3958 | ||
11212d8f PB |
3959 | /* If BS is a copy on write image, it is initialized to |
3960 | the contents of the base image, which may not be zeroes. */ | |
3961 | if (bs->backing_hd) { | |
3962 | return 0; | |
3963 | } | |
336c1c12 KW |
3964 | if (bs->drv->bdrv_has_zero_init) { |
3965 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
3966 | } |
3967 | ||
3ac21627 PL |
3968 | /* safe default */ |
3969 | return 0; | |
f2feebbd KW |
3970 | } |
3971 | ||
4ce78691 PL |
3972 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
3973 | { | |
3974 | BlockDriverInfo bdi; | |
3975 | ||
3976 | if (bs->backing_hd) { | |
3977 | return false; | |
3978 | } | |
3979 | ||
3980 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3981 | return bdi.unallocated_blocks_are_zero; | |
3982 | } | |
3983 | ||
3984 | return false; | |
3985 | } | |
3986 | ||
3987 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) | |
3988 | { | |
3989 | BlockDriverInfo bdi; | |
3990 | ||
3991 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { | |
3992 | return false; | |
3993 | } | |
3994 | ||
3995 | if (bdrv_get_info(bs, &bdi) == 0) { | |
3996 | return bdi.can_write_zeroes_with_unmap; | |
3997 | } | |
3998 | ||
3999 | return false; | |
4000 | } | |
4001 | ||
b6b8a333 | 4002 | typedef struct BdrvCoGetBlockStatusData { |
376ae3f1 | 4003 | BlockDriverState *bs; |
b35b2bba | 4004 | BlockDriverState *base; |
376ae3f1 SH |
4005 | int64_t sector_num; |
4006 | int nb_sectors; | |
4007 | int *pnum; | |
b6b8a333 | 4008 | int64_t ret; |
376ae3f1 | 4009 | bool done; |
b6b8a333 | 4010 | } BdrvCoGetBlockStatusData; |
376ae3f1 | 4011 | |
f58c7b35 TS |
4012 | /* |
4013 | * Returns true iff the specified sector is present in the disk image. Drivers | |
4014 | * not implementing the functionality are assumed to not support backing files, | |
4015 | * hence all their sectors are reported as allocated. | |
4016 | * | |
bd9533e3 SH |
4017 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
4018 | * and 'pnum' is set to 0. | |
4019 | * | |
f58c7b35 TS |
4020 | * 'pnum' is set to the number of sectors (including and immediately following |
4021 | * the specified sector) that are known to be in the same | |
4022 | * allocated/unallocated state. | |
4023 | * | |
bd9533e3 SH |
4024 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
4025 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 4026 | */ |
b6b8a333 PB |
4027 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
4028 | int64_t sector_num, | |
4029 | int nb_sectors, int *pnum) | |
f58c7b35 | 4030 | { |
30a7f2fc | 4031 | int64_t total_sectors; |
bd9533e3 | 4032 | int64_t n; |
5daa74a6 | 4033 | int64_t ret, ret2; |
bd9533e3 | 4034 | |
30a7f2fc MA |
4035 | total_sectors = bdrv_nb_sectors(bs); |
4036 | if (total_sectors < 0) { | |
4037 | return total_sectors; | |
617ccb46 PB |
4038 | } |
4039 | ||
30a7f2fc | 4040 | if (sector_num >= total_sectors) { |
bd9533e3 SH |
4041 | *pnum = 0; |
4042 | return 0; | |
4043 | } | |
4044 | ||
30a7f2fc | 4045 | n = total_sectors - sector_num; |
bd9533e3 SH |
4046 | if (n < nb_sectors) { |
4047 | nb_sectors = n; | |
4048 | } | |
4049 | ||
b6b8a333 | 4050 | if (!bs->drv->bdrv_co_get_block_status) { |
bd9533e3 | 4051 | *pnum = nb_sectors; |
e88ae226 | 4052 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
918e92d7 PB |
4053 | if (bs->drv->protocol_name) { |
4054 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); | |
4055 | } | |
4056 | return ret; | |
f58c7b35 | 4057 | } |
6aebab14 | 4058 | |
415b5b01 PB |
4059 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
4060 | if (ret < 0) { | |
3e0a233d | 4061 | *pnum = 0; |
415b5b01 PB |
4062 | return ret; |
4063 | } | |
4064 | ||
92bc50a5 PL |
4065 | if (ret & BDRV_BLOCK_RAW) { |
4066 | assert(ret & BDRV_BLOCK_OFFSET_VALID); | |
4067 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
4068 | *pnum, pnum); | |
4069 | } | |
4070 | ||
e88ae226 KW |
4071 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
4072 | ret |= BDRV_BLOCK_ALLOCATED; | |
4073 | } | |
4074 | ||
c3d86884 PL |
4075 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
4076 | if (bdrv_unallocated_blocks_are_zero(bs)) { | |
f0ad5712 | 4077 | ret |= BDRV_BLOCK_ZERO; |
1f9db224 | 4078 | } else if (bs->backing_hd) { |
f0ad5712 | 4079 | BlockDriverState *bs2 = bs->backing_hd; |
30a7f2fc MA |
4080 | int64_t nb_sectors2 = bdrv_nb_sectors(bs2); |
4081 | if (nb_sectors2 >= 0 && sector_num >= nb_sectors2) { | |
f0ad5712 PB |
4082 | ret |= BDRV_BLOCK_ZERO; |
4083 | } | |
4084 | } | |
415b5b01 | 4085 | } |
5daa74a6 PB |
4086 | |
4087 | if (bs->file && | |
4088 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && | |
4089 | (ret & BDRV_BLOCK_OFFSET_VALID)) { | |
4090 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, | |
4091 | *pnum, pnum); | |
4092 | if (ret2 >= 0) { | |
4093 | /* Ignore errors. This is just providing extra information, it | |
4094 | * is useful but not necessary. | |
4095 | */ | |
4096 | ret |= (ret2 & BDRV_BLOCK_ZERO); | |
4097 | } | |
4098 | } | |
4099 | ||
415b5b01 | 4100 | return ret; |
060f51c9 SH |
4101 | } |
4102 | ||
b6b8a333 PB |
4103 | /* Coroutine wrapper for bdrv_get_block_status() */ |
4104 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) | |
060f51c9 | 4105 | { |
b6b8a333 | 4106 | BdrvCoGetBlockStatusData *data = opaque; |
060f51c9 SH |
4107 | BlockDriverState *bs = data->bs; |
4108 | ||
b6b8a333 PB |
4109 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
4110 | data->pnum); | |
060f51c9 SH |
4111 | data->done = true; |
4112 | } | |
4113 | ||
4114 | /* | |
b6b8a333 | 4115 | * Synchronous wrapper around bdrv_co_get_block_status(). |
060f51c9 | 4116 | * |
b6b8a333 | 4117 | * See bdrv_co_get_block_status() for details. |
060f51c9 | 4118 | */ |
b6b8a333 PB |
4119 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
4120 | int nb_sectors, int *pnum) | |
060f51c9 | 4121 | { |
6aebab14 | 4122 | Coroutine *co; |
b6b8a333 | 4123 | BdrvCoGetBlockStatusData data = { |
6aebab14 SH |
4124 | .bs = bs, |
4125 | .sector_num = sector_num, | |
4126 | .nb_sectors = nb_sectors, | |
4127 | .pnum = pnum, | |
4128 | .done = false, | |
4129 | }; | |
4130 | ||
bdad13b9 PB |
4131 | if (qemu_in_coroutine()) { |
4132 | /* Fast-path if already in coroutine context */ | |
b6b8a333 | 4133 | bdrv_get_block_status_co_entry(&data); |
bdad13b9 | 4134 | } else { |
2572b37a SH |
4135 | AioContext *aio_context = bdrv_get_aio_context(bs); |
4136 | ||
b6b8a333 | 4137 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
bdad13b9 PB |
4138 | qemu_coroutine_enter(co, &data); |
4139 | while (!data.done) { | |
2572b37a | 4140 | aio_poll(aio_context, true); |
bdad13b9 | 4141 | } |
6aebab14 SH |
4142 | } |
4143 | return data.ret; | |
f58c7b35 TS |
4144 | } |
4145 | ||
b6b8a333 PB |
4146 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
4147 | int nb_sectors, int *pnum) | |
4148 | { | |
4333bb71 PB |
4149 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
4150 | if (ret < 0) { | |
4151 | return ret; | |
4152 | } | |
01fb2705 | 4153 | return !!(ret & BDRV_BLOCK_ALLOCATED); |
b6b8a333 PB |
4154 | } |
4155 | ||
188a7bbf PB |
4156 | /* |
4157 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
4158 | * | |
4159 | * Return true if the given sector is allocated in any image between | |
4160 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
4161 | * sector is allocated in any image of the chain. Return false otherwise. | |
4162 | * | |
4163 | * 'pnum' is set to the number of sectors (including and immediately following | |
4164 | * the specified sector) that are known to be in the same | |
4165 | * allocated/unallocated state. | |
4166 | * | |
4167 | */ | |
4f578637 PB |
4168 | int bdrv_is_allocated_above(BlockDriverState *top, |
4169 | BlockDriverState *base, | |
4170 | int64_t sector_num, | |
4171 | int nb_sectors, int *pnum) | |
188a7bbf PB |
4172 | { |
4173 | BlockDriverState *intermediate; | |
4174 | int ret, n = nb_sectors; | |
4175 | ||
4176 | intermediate = top; | |
4177 | while (intermediate && intermediate != base) { | |
4178 | int pnum_inter; | |
bdad13b9 PB |
4179 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
4180 | &pnum_inter); | |
188a7bbf PB |
4181 | if (ret < 0) { |
4182 | return ret; | |
4183 | } else if (ret) { | |
4184 | *pnum = pnum_inter; | |
4185 | return 1; | |
4186 | } | |
4187 | ||
4188 | /* | |
4189 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
4190 | * might have | |
4191 | * | |
4192 | * [sector_num+x, nr_sectors] allocated. | |
4193 | */ | |
63ba17d3 VI |
4194 | if (n > pnum_inter && |
4195 | (intermediate == top || | |
4196 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
4197 | n = pnum_inter; |
4198 | } | |
4199 | ||
4200 | intermediate = intermediate->backing_hd; | |
4201 | } | |
4202 | ||
4203 | *pnum = n; | |
4204 | return 0; | |
4205 | } | |
4206 | ||
045df330 AL |
4207 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
4208 | { | |
4209 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
4210 | return bs->backing_file; | |
4211 | else if (bs->encrypted) | |
4212 | return bs->filename; | |
4213 | else | |
4214 | return NULL; | |
4215 | } | |
4216 | ||
5fafdf24 | 4217 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
4218 | char *filename, int filename_size) |
4219 | { | |
3574c608 | 4220 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
4221 | } |
4222 | ||
5fafdf24 | 4223 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
4224 | const uint8_t *buf, int nb_sectors) |
4225 | { | |
4226 | BlockDriver *drv = bs->drv; | |
4227 | if (!drv) | |
19cb3738 | 4228 | return -ENOMEDIUM; |
faea38e7 FB |
4229 | if (!drv->bdrv_write_compressed) |
4230 | return -ENOTSUP; | |
fbb7b4e0 KW |
4231 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
4232 | return -EIO; | |
a55eb92c | 4233 | |
e4654d2d | 4234 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
a55eb92c | 4235 | |
faea38e7 FB |
4236 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
4237 | } | |
3b46e624 | 4238 | |
faea38e7 FB |
4239 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
4240 | { | |
4241 | BlockDriver *drv = bs->drv; | |
4242 | if (!drv) | |
19cb3738 | 4243 | return -ENOMEDIUM; |
faea38e7 FB |
4244 | if (!drv->bdrv_get_info) |
4245 | return -ENOTSUP; | |
4246 | memset(bdi, 0, sizeof(*bdi)); | |
4247 | return drv->bdrv_get_info(bs, bdi); | |
4248 | } | |
4249 | ||
eae041fe HR |
4250 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
4251 | { | |
4252 | BlockDriver *drv = bs->drv; | |
4253 | if (drv && drv->bdrv_get_specific_info) { | |
4254 | return drv->bdrv_get_specific_info(bs); | |
4255 | } | |
4256 | return NULL; | |
4257 | } | |
4258 | ||
45566e9c CH |
4259 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
4260 | int64_t pos, int size) | |
cf8074b3 KW |
4261 | { |
4262 | QEMUIOVector qiov; | |
4263 | struct iovec iov = { | |
4264 | .iov_base = (void *) buf, | |
4265 | .iov_len = size, | |
4266 | }; | |
4267 | ||
4268 | qemu_iovec_init_external(&qiov, &iov, 1); | |
4269 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
4270 | } | |
4271 | ||
4272 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
4273 | { |
4274 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
4275 | |
4276 | if (!drv) { | |
178e08a5 | 4277 | return -ENOMEDIUM; |
cf8074b3 KW |
4278 | } else if (drv->bdrv_save_vmstate) { |
4279 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
4280 | } else if (bs->file) { | |
4281 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
4282 | } | |
4283 | ||
7cdb1f6d | 4284 | return -ENOTSUP; |
178e08a5 AL |
4285 | } |
4286 | ||
45566e9c CH |
4287 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
4288 | int64_t pos, int size) | |
178e08a5 AL |
4289 | { |
4290 | BlockDriver *drv = bs->drv; | |
4291 | if (!drv) | |
4292 | return -ENOMEDIUM; | |
7cdb1f6d MK |
4293 | if (drv->bdrv_load_vmstate) |
4294 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
4295 | if (bs->file) | |
4296 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
4297 | return -ENOTSUP; | |
178e08a5 AL |
4298 | } |
4299 | ||
8b9b0cc2 KW |
4300 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
4301 | { | |
bf736fe3 | 4302 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
4303 | return; |
4304 | } | |
4305 | ||
bf736fe3 | 4306 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
4307 | } |
4308 | ||
4309 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
4310 | const char *tag) | |
4311 | { | |
4312 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
4313 | bs = bs->file; | |
4314 | } | |
4315 | ||
4316 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
4317 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
4318 | } | |
4319 | ||
4320 | return -ENOTSUP; | |
4321 | } | |
4322 | ||
4cc70e93 FZ |
4323 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
4324 | { | |
4325 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { | |
4326 | bs = bs->file; | |
4327 | } | |
4328 | ||
4329 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { | |
4330 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); | |
4331 | } | |
4332 | ||
4333 | return -ENOTSUP; | |
4334 | } | |
4335 | ||
41c695c7 KW |
4336 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
4337 | { | |
938789ea | 4338 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
41c695c7 KW |
4339 | bs = bs->file; |
4340 | } | |
8b9b0cc2 | 4341 | |
41c695c7 KW |
4342 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
4343 | return bs->drv->bdrv_debug_resume(bs, tag); | |
4344 | } | |
4345 | ||
4346 | return -ENOTSUP; | |
4347 | } | |
4348 | ||
4349 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
4350 | { | |
4351 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
4352 | bs = bs->file; | |
4353 | } | |
4354 | ||
4355 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
4356 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
4357 | } | |
4358 | ||
4359 | return false; | |
8b9b0cc2 KW |
4360 | } |
4361 | ||
199630b6 BS |
4362 | int bdrv_is_snapshot(BlockDriverState *bs) |
4363 | { | |
4364 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
4365 | } | |
4366 | ||
b1b1d783 JC |
4367 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
4368 | * relative, it must be relative to the chain. So, passing in bs->filename | |
4369 | * from a BDS as backing_file should not be done, as that may be relative to | |
4370 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
4371 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
4372 | const char *backing_file) | |
4373 | { | |
b1b1d783 JC |
4374 | char *filename_full = NULL; |
4375 | char *backing_file_full = NULL; | |
4376 | char *filename_tmp = NULL; | |
4377 | int is_protocol = 0; | |
4378 | BlockDriverState *curr_bs = NULL; | |
4379 | BlockDriverState *retval = NULL; | |
4380 | ||
4381 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
4382 | return NULL; |
4383 | } | |
4384 | ||
b1b1d783 JC |
4385 | filename_full = g_malloc(PATH_MAX); |
4386 | backing_file_full = g_malloc(PATH_MAX); | |
4387 | filename_tmp = g_malloc(PATH_MAX); | |
4388 | ||
4389 | is_protocol = path_has_protocol(backing_file); | |
4390 | ||
4391 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
4392 | ||
4393 | /* If either of the filename paths is actually a protocol, then | |
4394 | * compare unmodified paths; otherwise make paths relative */ | |
4395 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
4396 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
4397 | retval = curr_bs->backing_hd; | |
4398 | break; | |
4399 | } | |
e8a6bb9c | 4400 | } else { |
b1b1d783 JC |
4401 | /* If not an absolute filename path, make it relative to the current |
4402 | * image's filename path */ | |
4403 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4404 | backing_file); | |
4405 | ||
4406 | /* We are going to compare absolute pathnames */ | |
4407 | if (!realpath(filename_tmp, filename_full)) { | |
4408 | continue; | |
4409 | } | |
4410 | ||
4411 | /* We need to make sure the backing filename we are comparing against | |
4412 | * is relative to the current image filename (or absolute) */ | |
4413 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
4414 | curr_bs->backing_file); | |
4415 | ||
4416 | if (!realpath(filename_tmp, backing_file_full)) { | |
4417 | continue; | |
4418 | } | |
4419 | ||
4420 | if (strcmp(backing_file_full, filename_full) == 0) { | |
4421 | retval = curr_bs->backing_hd; | |
4422 | break; | |
4423 | } | |
e8a6bb9c MT |
4424 | } |
4425 | } | |
4426 | ||
b1b1d783 JC |
4427 | g_free(filename_full); |
4428 | g_free(backing_file_full); | |
4429 | g_free(filename_tmp); | |
4430 | return retval; | |
e8a6bb9c MT |
4431 | } |
4432 | ||
f198fd1c BC |
4433 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
4434 | { | |
4435 | if (!bs->drv) { | |
4436 | return 0; | |
4437 | } | |
4438 | ||
4439 | if (!bs->backing_hd) { | |
4440 | return 0; | |
4441 | } | |
4442 | ||
4443 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
4444 | } | |
4445 | ||
ea2384d3 | 4446 | /**************************************************************/ |
83f64091 | 4447 | /* async I/Os */ |
ea2384d3 | 4448 | |
3b69e4b9 | 4449 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 4450 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 4451 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 4452 | { |
bbf0a440 SH |
4453 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
4454 | ||
d20d9b7c | 4455 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4456 | cb, opaque, false); |
ea2384d3 FB |
4457 | } |
4458 | ||
f141eafe AL |
4459 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
4460 | QEMUIOVector *qiov, int nb_sectors, | |
4461 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 4462 | { |
bbf0a440 SH |
4463 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
4464 | ||
d20d9b7c | 4465 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
8c5873d6 | 4466 | cb, opaque, true); |
83f64091 FB |
4467 | } |
4468 | ||
d5ef94d4 PB |
4469 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
4470 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, | |
4471 | BlockDriverCompletionFunc *cb, void *opaque) | |
4472 | { | |
4473 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); | |
4474 | ||
4475 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, | |
4476 | BDRV_REQ_ZERO_WRITE | flags, | |
4477 | cb, opaque, true); | |
4478 | } | |
4479 | ||
40b4f539 KW |
4480 | |
4481 | typedef struct MultiwriteCB { | |
4482 | int error; | |
4483 | int num_requests; | |
4484 | int num_callbacks; | |
4485 | struct { | |
4486 | BlockDriverCompletionFunc *cb; | |
4487 | void *opaque; | |
4488 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
4489 | } callbacks[]; |
4490 | } MultiwriteCB; | |
4491 | ||
4492 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
4493 | { | |
4494 | int i; | |
4495 | ||
4496 | for (i = 0; i < mcb->num_callbacks; i++) { | |
4497 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
4498 | if (mcb->callbacks[i].free_qiov) { |
4499 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
4500 | } | |
7267c094 | 4501 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
4502 | } |
4503 | } | |
4504 | ||
4505 | static void multiwrite_cb(void *opaque, int ret) | |
4506 | { | |
4507 | MultiwriteCB *mcb = opaque; | |
4508 | ||
6d519a5f SH |
4509 | trace_multiwrite_cb(mcb, ret); |
4510 | ||
cb6d3ca0 | 4511 | if (ret < 0 && !mcb->error) { |
40b4f539 | 4512 | mcb->error = ret; |
40b4f539 KW |
4513 | } |
4514 | ||
4515 | mcb->num_requests--; | |
4516 | if (mcb->num_requests == 0) { | |
de189a1b | 4517 | multiwrite_user_cb(mcb); |
7267c094 | 4518 | g_free(mcb); |
40b4f539 KW |
4519 | } |
4520 | } | |
4521 | ||
4522 | static int multiwrite_req_compare(const void *a, const void *b) | |
4523 | { | |
77be4366 CH |
4524 | const BlockRequest *req1 = a, *req2 = b; |
4525 | ||
4526 | /* | |
4527 | * Note that we can't simply subtract req2->sector from req1->sector | |
4528 | * here as that could overflow the return value. | |
4529 | */ | |
4530 | if (req1->sector > req2->sector) { | |
4531 | return 1; | |
4532 | } else if (req1->sector < req2->sector) { | |
4533 | return -1; | |
4534 | } else { | |
4535 | return 0; | |
4536 | } | |
40b4f539 KW |
4537 | } |
4538 | ||
4539 | /* | |
4540 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
4541 | * requests that remain after merging. | |
4542 | */ | |
4543 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
4544 | int num_reqs, MultiwriteCB *mcb) | |
4545 | { | |
4546 | int i, outidx; | |
4547 | ||
4548 | // Sort requests by start sector | |
4549 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
4550 | ||
4551 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
4552 | // filling up gaps with zero sectors. | |
4553 | outidx = 0; | |
4554 | for (i = 1; i < num_reqs; i++) { | |
4555 | int merge = 0; | |
4556 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
4557 | ||
b6a127a1 | 4558 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
4559 | if (reqs[i].sector <= oldreq_last) { |
4560 | merge = 1; | |
4561 | } | |
4562 | ||
e2a305fb CH |
4563 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
4564 | merge = 0; | |
4565 | } | |
4566 | ||
40b4f539 KW |
4567 | if (merge) { |
4568 | size_t size; | |
7267c094 | 4569 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
4570 | qemu_iovec_init(qiov, |
4571 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
4572 | ||
4573 | // Add the first request to the merged one. If the requests are | |
4574 | // overlapping, drop the last sectors of the first request. | |
4575 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 4576 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 4577 | |
b6a127a1 PB |
4578 | // We should need to add any zeros between the two requests |
4579 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
4580 | |
4581 | // Add the second request | |
1b093c48 | 4582 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 4583 | |
391827eb SH |
4584 | // Add tail of first request, if necessary |
4585 | if (qiov->size < reqs[outidx].qiov->size) { | |
4586 | qemu_iovec_concat(qiov, reqs[outidx].qiov, qiov->size, | |
4587 | reqs[outidx].qiov->size - qiov->size); | |
4588 | } | |
4589 | ||
cbf1dff2 | 4590 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
4591 | reqs[outidx].qiov = qiov; |
4592 | ||
4593 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
4594 | } else { | |
4595 | outidx++; | |
4596 | reqs[outidx].sector = reqs[i].sector; | |
4597 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
4598 | reqs[outidx].qiov = reqs[i].qiov; | |
4599 | } | |
4600 | } | |
4601 | ||
4602 | return outidx + 1; | |
4603 | } | |
4604 | ||
4605 | /* | |
4606 | * Submit multiple AIO write requests at once. | |
4607 | * | |
4608 | * On success, the function returns 0 and all requests in the reqs array have | |
4609 | * been submitted. In error case this function returns -1, and any of the | |
4610 | * requests may or may not be submitted yet. In particular, this means that the | |
4611 | * callback will be called for some of the requests, for others it won't. The | |
4612 | * caller must check the error field of the BlockRequest to wait for the right | |
4613 | * callbacks (if error != 0, no callback will be called). | |
4614 | * | |
4615 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
4616 | * requests. However, the fields opaque and error are left unmodified as they | |
4617 | * are used to signal failure for a single request to the caller. | |
4618 | */ | |
4619 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
4620 | { | |
40b4f539 KW |
4621 | MultiwriteCB *mcb; |
4622 | int i; | |
4623 | ||
301db7c2 RH |
4624 | /* don't submit writes if we don't have a medium */ |
4625 | if (bs->drv == NULL) { | |
4626 | for (i = 0; i < num_reqs; i++) { | |
4627 | reqs[i].error = -ENOMEDIUM; | |
4628 | } | |
4629 | return -1; | |
4630 | } | |
4631 | ||
40b4f539 KW |
4632 | if (num_reqs == 0) { |
4633 | return 0; | |
4634 | } | |
4635 | ||
4636 | // Create MultiwriteCB structure | |
7267c094 | 4637 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
4638 | mcb->num_requests = 0; |
4639 | mcb->num_callbacks = num_reqs; | |
4640 | ||
4641 | for (i = 0; i < num_reqs; i++) { | |
4642 | mcb->callbacks[i].cb = reqs[i].cb; | |
4643 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
4644 | } | |
4645 | ||
4646 | // Check for mergable requests | |
4647 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
4648 | ||
6d519a5f SH |
4649 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
4650 | ||
df9309fb PB |
4651 | /* Run the aio requests. */ |
4652 | mcb->num_requests = num_reqs; | |
40b4f539 | 4653 | for (i = 0; i < num_reqs; i++) { |
d20d9b7c PB |
4654 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
4655 | reqs[i].nb_sectors, reqs[i].flags, | |
4656 | multiwrite_cb, mcb, | |
4657 | true); | |
40b4f539 KW |
4658 | } |
4659 | ||
4660 | return 0; | |
40b4f539 KW |
4661 | } |
4662 | ||
83f64091 | 4663 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 4664 | { |
ca5fd113 FZ |
4665 | qemu_aio_ref(acb); |
4666 | bdrv_aio_cancel_async(acb); | |
4667 | while (acb->refcnt > 1) { | |
4668 | if (acb->aiocb_info->get_aio_context) { | |
4669 | aio_poll(acb->aiocb_info->get_aio_context(acb), true); | |
4670 | } else if (acb->bs) { | |
4671 | aio_poll(bdrv_get_aio_context(acb->bs), true); | |
4672 | } else { | |
4673 | abort(); | |
02c50efe | 4674 | } |
02c50efe | 4675 | } |
8007429a | 4676 | qemu_aio_unref(acb); |
02c50efe FZ |
4677 | } |
4678 | ||
4679 | /* Async version of aio cancel. The caller is not blocked if the acb implements | |
4680 | * cancel_async, otherwise we do nothing and let the request normally complete. | |
4681 | * In either case the completion callback must be called. */ | |
4682 | void bdrv_aio_cancel_async(BlockDriverAIOCB *acb) | |
4683 | { | |
4684 | if (acb->aiocb_info->cancel_async) { | |
4685 | acb->aiocb_info->cancel_async(acb); | |
4686 | } | |
83f64091 FB |
4687 | } |
4688 | ||
4689 | /**************************************************************/ | |
4690 | /* async block device emulation */ | |
4691 | ||
c16b5a2c CH |
4692 | typedef struct BlockDriverAIOCBSync { |
4693 | BlockDriverAIOCB common; | |
4694 | QEMUBH *bh; | |
4695 | int ret; | |
4696 | /* vector translation state */ | |
4697 | QEMUIOVector *qiov; | |
4698 | uint8_t *bounce; | |
4699 | int is_write; | |
4700 | } BlockDriverAIOCBSync; | |
4701 | ||
d7331bed | 4702 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c | 4703 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
c16b5a2c CH |
4704 | }; |
4705 | ||
ce1a14dc | 4706 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 4707 | { |
ce1a14dc | 4708 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 4709 | |
857d4f46 | 4710 | if (!acb->is_write && acb->ret >= 0) { |
03396148 | 4711 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
857d4f46 | 4712 | } |
ceb42de8 | 4713 | qemu_vfree(acb->bounce); |
ce1a14dc | 4714 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 4715 | qemu_bh_delete(acb->bh); |
36afc451 | 4716 | acb->bh = NULL; |
8007429a | 4717 | qemu_aio_unref(acb); |
83f64091 | 4718 | } |
beac80cd | 4719 | |
f141eafe AL |
4720 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
4721 | int64_t sector_num, | |
4722 | QEMUIOVector *qiov, | |
4723 | int nb_sectors, | |
4724 | BlockDriverCompletionFunc *cb, | |
4725 | void *opaque, | |
4726 | int is_write) | |
4727 | ||
83f64091 | 4728 | { |
ce1a14dc | 4729 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 4730 | |
d7331bed | 4731 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
4732 | acb->is_write = is_write; |
4733 | acb->qiov = qiov; | |
857d4f46 | 4734 | acb->bounce = qemu_try_blockalign(bs, qiov->size); |
2572b37a | 4735 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
f141eafe | 4736 | |
857d4f46 KW |
4737 | if (acb->bounce == NULL) { |
4738 | acb->ret = -ENOMEM; | |
4739 | } else if (is_write) { | |
d5e6b161 | 4740 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 4741 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 4742 | } else { |
1ed20acf | 4743 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
4744 | } |
4745 | ||
ce1a14dc | 4746 | qemu_bh_schedule(acb->bh); |
f141eafe | 4747 | |
ce1a14dc | 4748 | return &acb->common; |
beac80cd FB |
4749 | } |
4750 | ||
f141eafe AL |
4751 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
4752 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 4753 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 4754 | { |
f141eafe AL |
4755 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
4756 | } | |
83f64091 | 4757 | |
f141eafe AL |
4758 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
4759 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
4760 | BlockDriverCompletionFunc *cb, void *opaque) | |
4761 | { | |
4762 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 4763 | } |
beac80cd | 4764 | |
68485420 KW |
4765 | |
4766 | typedef struct BlockDriverAIOCBCoroutine { | |
4767 | BlockDriverAIOCB common; | |
4768 | BlockRequest req; | |
4769 | bool is_write; | |
d318aea9 | 4770 | bool *done; |
68485420 KW |
4771 | QEMUBH* bh; |
4772 | } BlockDriverAIOCBCoroutine; | |
4773 | ||
d7331bed | 4774 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 | 4775 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
68485420 KW |
4776 | }; |
4777 | ||
35246a68 | 4778 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
4779 | { |
4780 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4781 | ||
4782 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 | 4783 | |
68485420 | 4784 | qemu_bh_delete(acb->bh); |
8007429a | 4785 | qemu_aio_unref(acb); |
68485420 KW |
4786 | } |
4787 | ||
b2a61371 SH |
4788 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
4789 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
4790 | { | |
4791 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4792 | BlockDriverState *bs = acb->common.bs; | |
4793 | ||
4794 | if (!acb->is_write) { | |
4795 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
d20d9b7c | 4796 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4797 | } else { |
4798 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
d20d9b7c | 4799 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
b2a61371 SH |
4800 | } |
4801 | ||
2572b37a | 4802 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2a61371 SH |
4803 | qemu_bh_schedule(acb->bh); |
4804 | } | |
4805 | ||
68485420 KW |
4806 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
4807 | int64_t sector_num, | |
4808 | QEMUIOVector *qiov, | |
4809 | int nb_sectors, | |
d20d9b7c | 4810 | BdrvRequestFlags flags, |
68485420 KW |
4811 | BlockDriverCompletionFunc *cb, |
4812 | void *opaque, | |
8c5873d6 | 4813 | bool is_write) |
68485420 KW |
4814 | { |
4815 | Coroutine *co; | |
4816 | BlockDriverAIOCBCoroutine *acb; | |
4817 | ||
d7331bed | 4818 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
4819 | acb->req.sector = sector_num; |
4820 | acb->req.nb_sectors = nb_sectors; | |
4821 | acb->req.qiov = qiov; | |
d20d9b7c | 4822 | acb->req.flags = flags; |
68485420 KW |
4823 | acb->is_write = is_write; |
4824 | ||
8c5873d6 | 4825 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
4826 | qemu_coroutine_enter(co, acb); |
4827 | ||
4828 | return &acb->common; | |
4829 | } | |
4830 | ||
07f07615 | 4831 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 4832 | { |
07f07615 PB |
4833 | BlockDriverAIOCBCoroutine *acb = opaque; |
4834 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 4835 | |
07f07615 | 4836 | acb->req.error = bdrv_co_flush(bs); |
2572b37a | 4837 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
b2e12bc6 | 4838 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
4839 | } |
4840 | ||
07f07615 | 4841 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
4842 | BlockDriverCompletionFunc *cb, void *opaque) |
4843 | { | |
07f07615 | 4844 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 4845 | |
07f07615 PB |
4846 | Coroutine *co; |
4847 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 4848 | |
d7331bed | 4849 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 | 4850 | |
07f07615 PB |
4851 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
4852 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 4853 | |
016f5cf6 AG |
4854 | return &acb->common; |
4855 | } | |
4856 | ||
4265d620 PB |
4857 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
4858 | { | |
4859 | BlockDriverAIOCBCoroutine *acb = opaque; | |
4860 | BlockDriverState *bs = acb->common.bs; | |
4861 | ||
4862 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
2572b37a | 4863 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
4265d620 PB |
4864 | qemu_bh_schedule(acb->bh); |
4865 | } | |
4866 | ||
4867 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
4868 | int64_t sector_num, int nb_sectors, | |
4869 | BlockDriverCompletionFunc *cb, void *opaque) | |
4870 | { | |
4871 | Coroutine *co; | |
4872 | BlockDriverAIOCBCoroutine *acb; | |
4873 | ||
4874 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
4875 | ||
d7331bed | 4876 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
4877 | acb->req.sector = sector_num; |
4878 | acb->req.nb_sectors = nb_sectors; | |
4879 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); | |
4880 | qemu_coroutine_enter(co, acb); | |
4881 | ||
4882 | return &acb->common; | |
4883 | } | |
4884 | ||
ea2384d3 FB |
4885 | void bdrv_init(void) |
4886 | { | |
5efa9d5a | 4887 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 4888 | } |
ce1a14dc | 4889 | |
eb852011 MA |
4890 | void bdrv_init_with_whitelist(void) |
4891 | { | |
4892 | use_bdrv_whitelist = 1; | |
4893 | bdrv_init(); | |
4894 | } | |
4895 | ||
d7331bed | 4896 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 4897 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 4898 | { |
ce1a14dc PB |
4899 | BlockDriverAIOCB *acb; |
4900 | ||
d7331bed SH |
4901 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
4902 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
4903 | acb->bs = bs; |
4904 | acb->cb = cb; | |
4905 | acb->opaque = opaque; | |
f197fe2b | 4906 | acb->refcnt = 1; |
ce1a14dc PB |
4907 | return acb; |
4908 | } | |
4909 | ||
f197fe2b FZ |
4910 | void qemu_aio_ref(void *p) |
4911 | { | |
4912 | BlockDriverAIOCB *acb = p; | |
4913 | acb->refcnt++; | |
4914 | } | |
4915 | ||
8007429a | 4916 | void qemu_aio_unref(void *p) |
ce1a14dc | 4917 | { |
d37c975f | 4918 | BlockDriverAIOCB *acb = p; |
f197fe2b FZ |
4919 | assert(acb->refcnt > 0); |
4920 | if (--acb->refcnt == 0) { | |
4921 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); | |
4922 | } | |
ce1a14dc | 4923 | } |
19cb3738 | 4924 | |
f9f05dc5 KW |
4925 | /**************************************************************/ |
4926 | /* Coroutine block device emulation */ | |
4927 | ||
4928 | typedef struct CoroutineIOCompletion { | |
4929 | Coroutine *coroutine; | |
4930 | int ret; | |
4931 | } CoroutineIOCompletion; | |
4932 | ||
4933 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
4934 | { | |
4935 | CoroutineIOCompletion *co = opaque; | |
4936 | ||
4937 | co->ret = ret; | |
4938 | qemu_coroutine_enter(co->coroutine, NULL); | |
4939 | } | |
4940 | ||
4941 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
4942 | int nb_sectors, QEMUIOVector *iov, | |
4943 | bool is_write) | |
4944 | { | |
4945 | CoroutineIOCompletion co = { | |
4946 | .coroutine = qemu_coroutine_self(), | |
4947 | }; | |
4948 | BlockDriverAIOCB *acb; | |
4949 | ||
4950 | if (is_write) { | |
a652d160 SH |
4951 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
4952 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 4953 | } else { |
a652d160 SH |
4954 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
4955 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
4956 | } |
4957 | ||
59370aaa | 4958 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
4959 | if (!acb) { |
4960 | return -EIO; | |
4961 | } | |
4962 | qemu_coroutine_yield(); | |
4963 | ||
4964 | return co.ret; | |
4965 | } | |
4966 | ||
4967 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4968 | int64_t sector_num, int nb_sectors, | |
4969 | QEMUIOVector *iov) | |
4970 | { | |
4971 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4972 | } | |
4973 | ||
4974 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4975 | int64_t sector_num, int nb_sectors, | |
4976 | QEMUIOVector *iov) | |
4977 | { | |
4978 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4979 | } | |
4980 | ||
07f07615 | 4981 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4982 | { |
07f07615 PB |
4983 | RwCo *rwco = opaque; |
4984 | ||
4985 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4986 | } | |
4987 | ||
4988 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4989 | { | |
eb489bb1 KW |
4990 | int ret; |
4991 | ||
29cdb251 | 4992 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4993 | return 0; |
eb489bb1 KW |
4994 | } |
4995 | ||
ca716364 | 4996 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4997 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4998 | if (bs->drv->bdrv_co_flush_to_os) { |
4999 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
5000 | if (ret < 0) { | |
5001 | return ret; | |
5002 | } | |
5003 | } | |
5004 | ||
ca716364 KW |
5005 | /* But don't actually force it to the disk with cache=unsafe */ |
5006 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 5007 | goto flush_parent; |
ca716364 KW |
5008 | } |
5009 | ||
bf736fe3 | 5010 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 5011 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 5012 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
5013 | } else if (bs->drv->bdrv_aio_flush) { |
5014 | BlockDriverAIOCB *acb; | |
5015 | CoroutineIOCompletion co = { | |
5016 | .coroutine = qemu_coroutine_self(), | |
5017 | }; | |
5018 | ||
5019 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
5020 | if (acb == NULL) { | |
29cdb251 | 5021 | ret = -EIO; |
07f07615 PB |
5022 | } else { |
5023 | qemu_coroutine_yield(); | |
29cdb251 | 5024 | ret = co.ret; |
07f07615 | 5025 | } |
07f07615 PB |
5026 | } else { |
5027 | /* | |
5028 | * Some block drivers always operate in either writethrough or unsafe | |
5029 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
5030 | * know how the server works (because the behaviour is hardcoded or | |
5031 | * depends on server-side configuration), so we can't ensure that | |
5032 | * everything is safe on disk. Returning an error doesn't work because | |
5033 | * that would break guests even if the server operates in writethrough | |
5034 | * mode. | |
5035 | * | |
5036 | * Let's hope the user knows what he's doing. | |
5037 | */ | |
29cdb251 | 5038 | ret = 0; |
07f07615 | 5039 | } |
29cdb251 PB |
5040 | if (ret < 0) { |
5041 | return ret; | |
5042 | } | |
5043 | ||
5044 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
5045 | * in the case of cache=unsafe, so there are no useless flushes. | |
5046 | */ | |
d4c82329 | 5047 | flush_parent: |
29cdb251 | 5048 | return bdrv_co_flush(bs->file); |
07f07615 PB |
5049 | } |
5050 | ||
5a8a30db | 5051 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
0f15423c | 5052 | { |
5a8a30db KW |
5053 | Error *local_err = NULL; |
5054 | int ret; | |
5055 | ||
3456a8d1 KW |
5056 | if (!bs->drv) { |
5057 | return; | |
5058 | } | |
5059 | ||
7ea2d269 AK |
5060 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
5061 | return; | |
5062 | } | |
5063 | bs->open_flags &= ~BDRV_O_INCOMING; | |
5064 | ||
3456a8d1 | 5065 | if (bs->drv->bdrv_invalidate_cache) { |
5a8a30db | 5066 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
3456a8d1 | 5067 | } else if (bs->file) { |
5a8a30db KW |
5068 | bdrv_invalidate_cache(bs->file, &local_err); |
5069 | } | |
5070 | if (local_err) { | |
5071 | error_propagate(errp, local_err); | |
5072 | return; | |
0f15423c | 5073 | } |
3456a8d1 | 5074 | |
5a8a30db KW |
5075 | ret = refresh_total_sectors(bs, bs->total_sectors); |
5076 | if (ret < 0) { | |
5077 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); | |
5078 | return; | |
5079 | } | |
0f15423c AL |
5080 | } |
5081 | ||
5a8a30db | 5082 | void bdrv_invalidate_cache_all(Error **errp) |
0f15423c AL |
5083 | { |
5084 | BlockDriverState *bs; | |
5a8a30db | 5085 | Error *local_err = NULL; |
0f15423c | 5086 | |
dc364f4c | 5087 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
ed78cda3 SH |
5088 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5089 | ||
5090 | aio_context_acquire(aio_context); | |
5a8a30db | 5091 | bdrv_invalidate_cache(bs, &local_err); |
ed78cda3 | 5092 | aio_context_release(aio_context); |
5a8a30db KW |
5093 | if (local_err) { |
5094 | error_propagate(errp, local_err); | |
5095 | return; | |
5096 | } | |
0f15423c AL |
5097 | } |
5098 | } | |
5099 | ||
07f07615 PB |
5100 | int bdrv_flush(BlockDriverState *bs) |
5101 | { | |
5102 | Coroutine *co; | |
5103 | RwCo rwco = { | |
5104 | .bs = bs, | |
5105 | .ret = NOT_DONE, | |
e7a8a783 | 5106 | }; |
e7a8a783 | 5107 | |
07f07615 PB |
5108 | if (qemu_in_coroutine()) { |
5109 | /* Fast-path if already in coroutine context */ | |
5110 | bdrv_flush_co_entry(&rwco); | |
5111 | } else { | |
2572b37a SH |
5112 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5113 | ||
07f07615 PB |
5114 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
5115 | qemu_coroutine_enter(co, &rwco); | |
5116 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5117 | aio_poll(aio_context, true); |
07f07615 | 5118 | } |
e7a8a783 | 5119 | } |
07f07615 PB |
5120 | |
5121 | return rwco.ret; | |
e7a8a783 KW |
5122 | } |
5123 | ||
775aa8b6 KW |
5124 | typedef struct DiscardCo { |
5125 | BlockDriverState *bs; | |
5126 | int64_t sector_num; | |
5127 | int nb_sectors; | |
5128 | int ret; | |
5129 | } DiscardCo; | |
4265d620 PB |
5130 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
5131 | { | |
775aa8b6 | 5132 | DiscardCo *rwco = opaque; |
4265d620 PB |
5133 | |
5134 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
5135 | } | |
5136 | ||
6f14da52 PL |
5137 | /* if no limit is specified in the BlockLimits use a default |
5138 | * of 32768 512-byte sectors (16 MiB) per request. | |
5139 | */ | |
5140 | #define MAX_DISCARD_DEFAULT 32768 | |
5141 | ||
4265d620 PB |
5142 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
5143 | int nb_sectors) | |
5144 | { | |
d51e9fe5 PB |
5145 | int max_discard; |
5146 | ||
4265d620 PB |
5147 | if (!bs->drv) { |
5148 | return -ENOMEDIUM; | |
5149 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
5150 | return -EIO; | |
5151 | } else if (bs->read_only) { | |
5152 | return -EROFS; | |
df702c9b PB |
5153 | } |
5154 | ||
e4654d2d | 5155 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b | 5156 | |
9e8f1835 PB |
5157 | /* Do nothing if disabled. */ |
5158 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
5159 | return 0; | |
5160 | } | |
5161 | ||
d51e9fe5 PB |
5162 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
5163 | return 0; | |
5164 | } | |
6f14da52 | 5165 | |
d51e9fe5 PB |
5166 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
5167 | while (nb_sectors > 0) { | |
5168 | int ret; | |
5169 | int num = nb_sectors; | |
6f14da52 | 5170 | |
d51e9fe5 PB |
5171 | /* align request */ |
5172 | if (bs->bl.discard_alignment && | |
5173 | num >= bs->bl.discard_alignment && | |
5174 | sector_num % bs->bl.discard_alignment) { | |
5175 | if (num > bs->bl.discard_alignment) { | |
5176 | num = bs->bl.discard_alignment; | |
6f14da52 | 5177 | } |
d51e9fe5 PB |
5178 | num -= sector_num % bs->bl.discard_alignment; |
5179 | } | |
6f14da52 | 5180 | |
d51e9fe5 PB |
5181 | /* limit request size */ |
5182 | if (num > max_discard) { | |
5183 | num = max_discard; | |
5184 | } | |
6f14da52 | 5185 | |
d51e9fe5 | 5186 | if (bs->drv->bdrv_co_discard) { |
6f14da52 | 5187 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
d51e9fe5 PB |
5188 | } else { |
5189 | BlockDriverAIOCB *acb; | |
5190 | CoroutineIOCompletion co = { | |
5191 | .coroutine = qemu_coroutine_self(), | |
5192 | }; | |
5193 | ||
5194 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
5195 | bdrv_co_io_em_complete, &co); | |
5196 | if (acb == NULL) { | |
5197 | return -EIO; | |
5198 | } else { | |
5199 | qemu_coroutine_yield(); | |
5200 | ret = co.ret; | |
6f14da52 | 5201 | } |
6f14da52 | 5202 | } |
7ce21016 | 5203 | if (ret && ret != -ENOTSUP) { |
d51e9fe5 | 5204 | return ret; |
4265d620 | 5205 | } |
d51e9fe5 PB |
5206 | |
5207 | sector_num += num; | |
5208 | nb_sectors -= num; | |
4265d620 | 5209 | } |
d51e9fe5 | 5210 | return 0; |
4265d620 PB |
5211 | } |
5212 | ||
5213 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
5214 | { | |
5215 | Coroutine *co; | |
775aa8b6 | 5216 | DiscardCo rwco = { |
4265d620 PB |
5217 | .bs = bs, |
5218 | .sector_num = sector_num, | |
5219 | .nb_sectors = nb_sectors, | |
5220 | .ret = NOT_DONE, | |
5221 | }; | |
5222 | ||
5223 | if (qemu_in_coroutine()) { | |
5224 | /* Fast-path if already in coroutine context */ | |
5225 | bdrv_discard_co_entry(&rwco); | |
5226 | } else { | |
2572b37a SH |
5227 | AioContext *aio_context = bdrv_get_aio_context(bs); |
5228 | ||
4265d620 PB |
5229 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
5230 | qemu_coroutine_enter(co, &rwco); | |
5231 | while (rwco.ret == NOT_DONE) { | |
2572b37a | 5232 | aio_poll(aio_context, true); |
4265d620 PB |
5233 | } |
5234 | } | |
5235 | ||
5236 | return rwco.ret; | |
5237 | } | |
5238 | ||
19cb3738 FB |
5239 | /**************************************************************/ |
5240 | /* removable device support */ | |
5241 | ||
5242 | /** | |
5243 | * Return TRUE if the media is present | |
5244 | */ | |
5245 | int bdrv_is_inserted(BlockDriverState *bs) | |
5246 | { | |
5247 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 5248 | |
19cb3738 FB |
5249 | if (!drv) |
5250 | return 0; | |
5251 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
5252 | return 1; |
5253 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
5254 | } |
5255 | ||
5256 | /** | |
8e49ca46 MA |
5257 | * Return whether the media changed since the last call to this |
5258 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
5259 | */ |
5260 | int bdrv_media_changed(BlockDriverState *bs) | |
5261 | { | |
5262 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5263 | |
8e49ca46 MA |
5264 | if (drv && drv->bdrv_media_changed) { |
5265 | return drv->bdrv_media_changed(bs); | |
5266 | } | |
5267 | return -ENOTSUP; | |
19cb3738 FB |
5268 | } |
5269 | ||
5270 | /** | |
5271 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
5272 | */ | |
f36f3949 | 5273 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
5274 | { |
5275 | BlockDriver *drv = bs->drv; | |
19cb3738 | 5276 | |
822e1cd1 MA |
5277 | if (drv && drv->bdrv_eject) { |
5278 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 5279 | } |
6f382ed2 LC |
5280 | |
5281 | if (bs->device_name[0] != '\0') { | |
a5ee7bd4 WX |
5282 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
5283 | eject_flag, &error_abort); | |
6f382ed2 | 5284 | } |
19cb3738 FB |
5285 | } |
5286 | ||
19cb3738 FB |
5287 | /** |
5288 | * Lock or unlock the media (if it is locked, the user won't be able | |
5289 | * to eject it manually). | |
5290 | */ | |
025e849a | 5291 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
5292 | { |
5293 | BlockDriver *drv = bs->drv; | |
5294 | ||
025e849a | 5295 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 5296 | |
025e849a MA |
5297 | if (drv && drv->bdrv_lock_medium) { |
5298 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
5299 | } |
5300 | } | |
985a03b0 TS |
5301 | |
5302 | /* needed for generic scsi interface */ | |
5303 | ||
5304 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
5305 | { | |
5306 | BlockDriver *drv = bs->drv; | |
5307 | ||
5308 | if (drv && drv->bdrv_ioctl) | |
5309 | return drv->bdrv_ioctl(bs, req, buf); | |
5310 | return -ENOTSUP; | |
5311 | } | |
7d780669 | 5312 | |
221f715d AL |
5313 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
5314 | unsigned long int req, void *buf, | |
5315 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 5316 | { |
221f715d | 5317 | BlockDriver *drv = bs->drv; |
7d780669 | 5318 | |
221f715d AL |
5319 | if (drv && drv->bdrv_aio_ioctl) |
5320 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
5321 | return NULL; | |
7d780669 | 5322 | } |
e268ca52 | 5323 | |
1b7fd729 | 5324 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
7b6f9300 | 5325 | { |
1b7fd729 | 5326 | bs->guest_block_size = align; |
7b6f9300 | 5327 | } |
7cd1e32a | 5328 | |
e268ca52 AL |
5329 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
5330 | { | |
339064d5 | 5331 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
e268ca52 | 5332 | } |
7cd1e32a | 5333 | |
7d2a35cc KW |
5334 | void *qemu_try_blockalign(BlockDriverState *bs, size_t size) |
5335 | { | |
5336 | size_t align = bdrv_opt_mem_align(bs); | |
5337 | ||
5338 | /* Ensure that NULL is never returned on success */ | |
5339 | assert(align > 0); | |
5340 | if (size == 0) { | |
5341 | size = align; | |
5342 | } | |
5343 | ||
5344 | return qemu_try_memalign(align, size); | |
5345 | } | |
5346 | ||
c53b1c51 SH |
5347 | /* |
5348 | * Check if all memory in this vector is sector aligned. | |
5349 | */ | |
5350 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
5351 | { | |
5352 | int i; | |
339064d5 | 5353 | size_t alignment = bdrv_opt_mem_align(bs); |
c53b1c51 SH |
5354 | |
5355 | for (i = 0; i < qiov->niov; i++) { | |
339064d5 | 5356 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
c53b1c51 | 5357 | return false; |
1ff735bd | 5358 | } |
339064d5 | 5359 | if (qiov->iov[i].iov_len % alignment) { |
1ff735bd | 5360 | return false; |
c53b1c51 SH |
5361 | } |
5362 | } | |
5363 | ||
5364 | return true; | |
5365 | } | |
5366 | ||
b8afb520 FZ |
5367 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
5368 | Error **errp) | |
7cd1e32a LS |
5369 | { |
5370 | int64_t bitmap_size; | |
e4654d2d | 5371 | BdrvDirtyBitmap *bitmap; |
a55eb92c | 5372 | |
50717e94 PB |
5373 | assert((granularity & (granularity - 1)) == 0); |
5374 | ||
e4654d2d FZ |
5375 | granularity >>= BDRV_SECTOR_BITS; |
5376 | assert(granularity); | |
57322b78 | 5377 | bitmap_size = bdrv_nb_sectors(bs); |
b8afb520 FZ |
5378 | if (bitmap_size < 0) { |
5379 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); | |
5380 | errno = -bitmap_size; | |
5381 | return NULL; | |
5382 | } | |
5839e53b | 5383 | bitmap = g_new0(BdrvDirtyBitmap, 1); |
e4654d2d FZ |
5384 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); |
5385 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); | |
5386 | return bitmap; | |
5387 | } | |
5388 | ||
5389 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) | |
5390 | { | |
5391 | BdrvDirtyBitmap *bm, *next; | |
5392 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { | |
5393 | if (bm == bitmap) { | |
5394 | QLIST_REMOVE(bitmap, list); | |
5395 | hbitmap_free(bitmap->bitmap); | |
5396 | g_free(bitmap); | |
5397 | return; | |
a55eb92c | 5398 | } |
7cd1e32a LS |
5399 | } |
5400 | } | |
5401 | ||
21b56835 FZ |
5402 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
5403 | { | |
5404 | BdrvDirtyBitmap *bm; | |
5405 | BlockDirtyInfoList *list = NULL; | |
5406 | BlockDirtyInfoList **plist = &list; | |
5407 | ||
5408 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { | |
5839e53b MA |
5409 | BlockDirtyInfo *info = g_new0(BlockDirtyInfo, 1); |
5410 | BlockDirtyInfoList *entry = g_new0(BlockDirtyInfoList, 1); | |
21b56835 FZ |
5411 | info->count = bdrv_get_dirty_count(bs, bm); |
5412 | info->granularity = | |
5413 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); | |
5414 | entry->value = info; | |
5415 | *plist = entry; | |
5416 | plist = &entry->next; | |
5417 | } | |
5418 | ||
5419 | return list; | |
5420 | } | |
5421 | ||
e4654d2d | 5422 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
7cd1e32a | 5423 | { |
e4654d2d FZ |
5424 | if (bitmap) { |
5425 | return hbitmap_get(bitmap->bitmap, sector); | |
7cd1e32a LS |
5426 | } else { |
5427 | return 0; | |
5428 | } | |
5429 | } | |
5430 | ||
e4654d2d FZ |
5431 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
5432 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) | |
1755da16 | 5433 | { |
e4654d2d | 5434 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
1755da16 PB |
5435 | } |
5436 | ||
5437 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
5438 | int nr_sectors) | |
5439 | { | |
e4654d2d FZ |
5440 | BdrvDirtyBitmap *bitmap; |
5441 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5442 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); | |
5443 | } | |
1755da16 PB |
5444 | } |
5445 | ||
e4654d2d | 5446 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
7cd1e32a | 5447 | { |
e4654d2d FZ |
5448 | BdrvDirtyBitmap *bitmap; |
5449 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { | |
5450 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); | |
5451 | } | |
7cd1e32a | 5452 | } |
aaa0eb75 | 5453 | |
e4654d2d | 5454 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
aaa0eb75 | 5455 | { |
e4654d2d | 5456 | return hbitmap_count(bitmap->bitmap); |
aaa0eb75 | 5457 | } |
f88e1a42 | 5458 | |
9fcb0251 FZ |
5459 | /* Get a reference to bs */ |
5460 | void bdrv_ref(BlockDriverState *bs) | |
5461 | { | |
5462 | bs->refcnt++; | |
5463 | } | |
5464 | ||
5465 | /* Release a previously grabbed reference to bs. | |
5466 | * If after releasing, reference count is zero, the BlockDriverState is | |
5467 | * deleted. */ | |
5468 | void bdrv_unref(BlockDriverState *bs) | |
5469 | { | |
9a4d5ca6 JC |
5470 | if (!bs) { |
5471 | return; | |
5472 | } | |
9fcb0251 FZ |
5473 | assert(bs->refcnt > 0); |
5474 | if (--bs->refcnt == 0) { | |
5475 | bdrv_delete(bs); | |
5476 | } | |
5477 | } | |
5478 | ||
fbe40ff7 FZ |
5479 | struct BdrvOpBlocker { |
5480 | Error *reason; | |
5481 | QLIST_ENTRY(BdrvOpBlocker) list; | |
5482 | }; | |
5483 | ||
5484 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) | |
5485 | { | |
5486 | BdrvOpBlocker *blocker; | |
5487 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5488 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { | |
5489 | blocker = QLIST_FIRST(&bs->op_blockers[op]); | |
5490 | if (errp) { | |
5491 | error_setg(errp, "Device '%s' is busy: %s", | |
5492 | bs->device_name, error_get_pretty(blocker->reason)); | |
5493 | } | |
5494 | return true; | |
5495 | } | |
5496 | return false; | |
5497 | } | |
5498 | ||
5499 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5500 | { | |
5501 | BdrvOpBlocker *blocker; | |
5502 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5503 | ||
5839e53b | 5504 | blocker = g_new0(BdrvOpBlocker, 1); |
fbe40ff7 FZ |
5505 | blocker->reason = reason; |
5506 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); | |
5507 | } | |
5508 | ||
5509 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) | |
5510 | { | |
5511 | BdrvOpBlocker *blocker, *next; | |
5512 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); | |
5513 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { | |
5514 | if (blocker->reason == reason) { | |
5515 | QLIST_REMOVE(blocker, list); | |
5516 | g_free(blocker); | |
5517 | } | |
5518 | } | |
5519 | } | |
5520 | ||
5521 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) | |
5522 | { | |
5523 | int i; | |
5524 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5525 | bdrv_op_block(bs, i, reason); | |
5526 | } | |
5527 | } | |
5528 | ||
5529 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) | |
5530 | { | |
5531 | int i; | |
5532 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5533 | bdrv_op_unblock(bs, i, reason); | |
5534 | } | |
5535 | } | |
5536 | ||
5537 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) | |
5538 | { | |
5539 | int i; | |
5540 | ||
5541 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { | |
5542 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { | |
5543 | return false; | |
5544 | } | |
5545 | } | |
5546 | return true; | |
5547 | } | |
5548 | ||
28a7282a LC |
5549 | void bdrv_iostatus_enable(BlockDriverState *bs) |
5550 | { | |
d6bf279e | 5551 | bs->iostatus_enabled = true; |
58e21ef5 | 5552 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
5553 | } |
5554 | ||
5555 | /* The I/O status is only enabled if the drive explicitly | |
5556 | * enables it _and_ the VM is configured to stop on errors */ | |
5557 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
5558 | { | |
d6bf279e | 5559 | return (bs->iostatus_enabled && |
92aa5c6d PB |
5560 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
5561 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
5562 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
5563 | } |
5564 | ||
5565 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
5566 | { | |
d6bf279e | 5567 | bs->iostatus_enabled = false; |
28a7282a LC |
5568 | } |
5569 | ||
5570 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
5571 | { | |
5572 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 5573 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
5574 | if (bs->job) { |
5575 | block_job_iostatus_reset(bs->job); | |
5576 | } | |
28a7282a LC |
5577 | } |
5578 | } | |
5579 | ||
28a7282a LC |
5580 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
5581 | { | |
3e1caa5f PB |
5582 | assert(bdrv_iostatus_is_enabled(bs)); |
5583 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
5584 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
5585 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
5586 | } |
5587 | } | |
5588 | ||
d92ada22 LC |
5589 | void bdrv_img_create(const char *filename, const char *fmt, |
5590 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
5591 | char *options, uint64_t img_size, int flags, |
5592 | Error **errp, bool quiet) | |
f88e1a42 | 5593 | { |
83d0521a CL |
5594 | QemuOptsList *create_opts = NULL; |
5595 | QemuOpts *opts = NULL; | |
5596 | const char *backing_fmt, *backing_file; | |
5597 | int64_t size; | |
f88e1a42 | 5598 | BlockDriver *drv, *proto_drv; |
96df67d1 | 5599 | BlockDriver *backing_drv = NULL; |
cc84d90f | 5600 | Error *local_err = NULL; |
f88e1a42 JS |
5601 | int ret = 0; |
5602 | ||
5603 | /* Find driver and parse its options */ | |
5604 | drv = bdrv_find_format(fmt); | |
5605 | if (!drv) { | |
71c79813 | 5606 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 5607 | return; |
f88e1a42 JS |
5608 | } |
5609 | ||
98289620 | 5610 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 5611 | if (!proto_drv) { |
71c79813 | 5612 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 5613 | return; |
f88e1a42 JS |
5614 | } |
5615 | ||
c282e1fd CL |
5616 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
5617 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); | |
f88e1a42 JS |
5618 | |
5619 | /* Create parameter list with default values */ | |
83d0521a CL |
5620 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
5621 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size); | |
f88e1a42 JS |
5622 | |
5623 | /* Parse -o options */ | |
5624 | if (options) { | |
83d0521a CL |
5625 | if (qemu_opts_do_parse(opts, options, NULL) != 0) { |
5626 | error_setg(errp, "Invalid options for file format '%s'", fmt); | |
f88e1a42 JS |
5627 | goto out; |
5628 | } | |
5629 | } | |
5630 | ||
5631 | if (base_filename) { | |
83d0521a | 5632 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename)) { |
71c79813 LC |
5633 | error_setg(errp, "Backing file not supported for file format '%s'", |
5634 | fmt); | |
f88e1a42 JS |
5635 | goto out; |
5636 | } | |
5637 | } | |
5638 | ||
5639 | if (base_fmt) { | |
83d0521a | 5640 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
71c79813 LC |
5641 | error_setg(errp, "Backing file format not supported for file " |
5642 | "format '%s'", fmt); | |
f88e1a42 JS |
5643 | goto out; |
5644 | } | |
5645 | } | |
5646 | ||
83d0521a CL |
5647 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
5648 | if (backing_file) { | |
5649 | if (!strcmp(filename, backing_file)) { | |
71c79813 LC |
5650 | error_setg(errp, "Error: Trying to create an image with the " |
5651 | "same filename as the backing file"); | |
792da93a JS |
5652 | goto out; |
5653 | } | |
5654 | } | |
5655 | ||
83d0521a CL |
5656 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
5657 | if (backing_fmt) { | |
5658 | backing_drv = bdrv_find_format(backing_fmt); | |
96df67d1 | 5659 | if (!backing_drv) { |
71c79813 | 5660 | error_setg(errp, "Unknown backing file format '%s'", |
83d0521a | 5661 | backing_fmt); |
f88e1a42 JS |
5662 | goto out; |
5663 | } | |
5664 | } | |
5665 | ||
5666 | // The size for the image must always be specified, with one exception: | |
5667 | // If we are using a backing file, we can obtain the size from there | |
83d0521a CL |
5668 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
5669 | if (size == -1) { | |
5670 | if (backing_file) { | |
66f6b814 | 5671 | BlockDriverState *bs; |
52bf1e72 | 5672 | int64_t size; |
63090dac PB |
5673 | int back_flags; |
5674 | ||
5675 | /* backing files always opened read-only */ | |
5676 | back_flags = | |
5677 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 5678 | |
f67503e5 | 5679 | bs = NULL; |
83d0521a | 5680 | ret = bdrv_open(&bs, backing_file, NULL, NULL, back_flags, |
cc84d90f | 5681 | backing_drv, &local_err); |
f88e1a42 | 5682 | if (ret < 0) { |
cc84d90f | 5683 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
83d0521a | 5684 | backing_file, |
cc84d90f HR |
5685 | error_get_pretty(local_err)); |
5686 | error_free(local_err); | |
5687 | local_err = NULL; | |
f88e1a42 JS |
5688 | goto out; |
5689 | } | |
52bf1e72 MA |
5690 | size = bdrv_getlength(bs); |
5691 | if (size < 0) { | |
5692 | error_setg_errno(errp, -size, "Could not get size of '%s'", | |
5693 | backing_file); | |
5694 | bdrv_unref(bs); | |
5695 | goto out; | |
5696 | } | |
f88e1a42 | 5697 | |
83d0521a | 5698 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size); |
66f6b814 HR |
5699 | |
5700 | bdrv_unref(bs); | |
f88e1a42 | 5701 | } else { |
71c79813 | 5702 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
5703 | goto out; |
5704 | } | |
5705 | } | |
5706 | ||
f382d43a MR |
5707 | if (!quiet) { |
5708 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
83d0521a | 5709 | qemu_opts_print(opts); |
f382d43a MR |
5710 | puts(""); |
5711 | } | |
83d0521a | 5712 | |
c282e1fd | 5713 | ret = bdrv_create(drv, filename, opts, &local_err); |
83d0521a | 5714 | |
cc84d90f HR |
5715 | if (ret == -EFBIG) { |
5716 | /* This is generally a better message than whatever the driver would | |
5717 | * deliver (especially because of the cluster_size_hint), since that | |
5718 | * is most probably not much different from "image too large". */ | |
5719 | const char *cluster_size_hint = ""; | |
83d0521a | 5720 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
cc84d90f | 5721 | cluster_size_hint = " (try using a larger cluster size)"; |
f88e1a42 | 5722 | } |
cc84d90f HR |
5723 | error_setg(errp, "The image size is too large for file format '%s'" |
5724 | "%s", fmt, cluster_size_hint); | |
5725 | error_free(local_err); | |
5726 | local_err = NULL; | |
f88e1a42 JS |
5727 | } |
5728 | ||
5729 | out: | |
83d0521a CL |
5730 | qemu_opts_del(opts); |
5731 | qemu_opts_free(create_opts); | |
84d18f06 | 5732 | if (local_err) { |
cc84d90f HR |
5733 | error_propagate(errp, local_err); |
5734 | } | |
f88e1a42 | 5735 | } |
85d126f3 SH |
5736 | |
5737 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
5738 | { | |
dcd04228 SH |
5739 | return bs->aio_context; |
5740 | } | |
5741 | ||
5742 | void bdrv_detach_aio_context(BlockDriverState *bs) | |
5743 | { | |
33384421 HR |
5744 | BdrvAioNotifier *baf; |
5745 | ||
dcd04228 SH |
5746 | if (!bs->drv) { |
5747 | return; | |
5748 | } | |
5749 | ||
33384421 HR |
5750 | QLIST_FOREACH(baf, &bs->aio_notifiers, list) { |
5751 | baf->detach_aio_context(baf->opaque); | |
5752 | } | |
5753 | ||
13af91eb SH |
5754 | if (bs->io_limits_enabled) { |
5755 | throttle_detach_aio_context(&bs->throttle_state); | |
5756 | } | |
dcd04228 SH |
5757 | if (bs->drv->bdrv_detach_aio_context) { |
5758 | bs->drv->bdrv_detach_aio_context(bs); | |
5759 | } | |
5760 | if (bs->file) { | |
5761 | bdrv_detach_aio_context(bs->file); | |
5762 | } | |
5763 | if (bs->backing_hd) { | |
5764 | bdrv_detach_aio_context(bs->backing_hd); | |
5765 | } | |
5766 | ||
5767 | bs->aio_context = NULL; | |
5768 | } | |
5769 | ||
5770 | void bdrv_attach_aio_context(BlockDriverState *bs, | |
5771 | AioContext *new_context) | |
5772 | { | |
33384421 HR |
5773 | BdrvAioNotifier *ban; |
5774 | ||
dcd04228 SH |
5775 | if (!bs->drv) { |
5776 | return; | |
5777 | } | |
5778 | ||
5779 | bs->aio_context = new_context; | |
5780 | ||
5781 | if (bs->backing_hd) { | |
5782 | bdrv_attach_aio_context(bs->backing_hd, new_context); | |
5783 | } | |
5784 | if (bs->file) { | |
5785 | bdrv_attach_aio_context(bs->file, new_context); | |
5786 | } | |
5787 | if (bs->drv->bdrv_attach_aio_context) { | |
5788 | bs->drv->bdrv_attach_aio_context(bs, new_context); | |
5789 | } | |
13af91eb SH |
5790 | if (bs->io_limits_enabled) { |
5791 | throttle_attach_aio_context(&bs->throttle_state, new_context); | |
5792 | } | |
33384421 HR |
5793 | |
5794 | QLIST_FOREACH(ban, &bs->aio_notifiers, list) { | |
5795 | ban->attached_aio_context(new_context, ban->opaque); | |
5796 | } | |
dcd04228 SH |
5797 | } |
5798 | ||
5799 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) | |
5800 | { | |
5801 | bdrv_drain_all(); /* ensure there are no in-flight requests */ | |
5802 | ||
5803 | bdrv_detach_aio_context(bs); | |
5804 | ||
5805 | /* This function executes in the old AioContext so acquire the new one in | |
5806 | * case it runs in a different thread. | |
5807 | */ | |
5808 | aio_context_acquire(new_context); | |
5809 | bdrv_attach_aio_context(bs, new_context); | |
5810 | aio_context_release(new_context); | |
85d126f3 | 5811 | } |
d616b224 | 5812 | |
33384421 HR |
5813 | void bdrv_add_aio_context_notifier(BlockDriverState *bs, |
5814 | void (*attached_aio_context)(AioContext *new_context, void *opaque), | |
5815 | void (*detach_aio_context)(void *opaque), void *opaque) | |
5816 | { | |
5817 | BdrvAioNotifier *ban = g_new(BdrvAioNotifier, 1); | |
5818 | *ban = (BdrvAioNotifier){ | |
5819 | .attached_aio_context = attached_aio_context, | |
5820 | .detach_aio_context = detach_aio_context, | |
5821 | .opaque = opaque | |
5822 | }; | |
5823 | ||
5824 | QLIST_INSERT_HEAD(&bs->aio_notifiers, ban, list); | |
5825 | } | |
5826 | ||
5827 | void bdrv_remove_aio_context_notifier(BlockDriverState *bs, | |
5828 | void (*attached_aio_context)(AioContext *, | |
5829 | void *), | |
5830 | void (*detach_aio_context)(void *), | |
5831 | void *opaque) | |
5832 | { | |
5833 | BdrvAioNotifier *ban, *ban_next; | |
5834 | ||
5835 | QLIST_FOREACH_SAFE(ban, &bs->aio_notifiers, list, ban_next) { | |
5836 | if (ban->attached_aio_context == attached_aio_context && | |
5837 | ban->detach_aio_context == detach_aio_context && | |
5838 | ban->opaque == opaque) | |
5839 | { | |
5840 | QLIST_REMOVE(ban, list); | |
5841 | g_free(ban); | |
5842 | ||
5843 | return; | |
5844 | } | |
5845 | } | |
5846 | ||
5847 | abort(); | |
5848 | } | |
5849 | ||
d616b224 SH |
5850 | void bdrv_add_before_write_notifier(BlockDriverState *bs, |
5851 | NotifierWithReturn *notifier) | |
5852 | { | |
5853 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
5854 | } | |
6f176b48 | 5855 | |
c282e1fd | 5856 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts) |
6f176b48 | 5857 | { |
c282e1fd | 5858 | if (!bs->drv->bdrv_amend_options) { |
6f176b48 HR |
5859 | return -ENOTSUP; |
5860 | } | |
c282e1fd | 5861 | return bs->drv->bdrv_amend_options(bs, opts); |
6f176b48 | 5862 | } |
f6186f49 | 5863 | |
b5042a36 BC |
5864 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
5865 | * of block filter and by bdrv_is_first_non_filter. | |
5866 | * It is used to test if the given bs is the candidate or recurse more in the | |
5867 | * node graph. | |
212a5a8f | 5868 | */ |
b5042a36 | 5869 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
212a5a8f | 5870 | BlockDriverState *candidate) |
f6186f49 | 5871 | { |
b5042a36 BC |
5872 | /* return false if basic checks fails */ |
5873 | if (!bs || !bs->drv) { | |
212a5a8f | 5874 | return false; |
f6186f49 BC |
5875 | } |
5876 | ||
b5042a36 BC |
5877 | /* the code reached a non block filter driver -> check if the bs is |
5878 | * the same as the candidate. It's the recursion termination condition. | |
5879 | */ | |
5880 | if (!bs->drv->is_filter) { | |
5881 | return bs == candidate; | |
212a5a8f | 5882 | } |
b5042a36 | 5883 | /* Down this path the driver is a block filter driver */ |
212a5a8f | 5884 | |
b5042a36 BC |
5885 | /* If the block filter recursion method is defined use it to recurse down |
5886 | * the node graph. | |
5887 | */ | |
5888 | if (bs->drv->bdrv_recurse_is_first_non_filter) { | |
212a5a8f | 5889 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
f6186f49 BC |
5890 | } |
5891 | ||
b5042a36 BC |
5892 | /* the driver is a block filter but don't allow to recurse -> return false |
5893 | */ | |
5894 | return false; | |
f6186f49 BC |
5895 | } |
5896 | ||
212a5a8f BC |
5897 | /* This function checks if the candidate is the first non filter bs down it's |
5898 | * bs chain. Since we don't have pointers to parents it explore all bs chains | |
5899 | * from the top. Some filters can choose not to pass down the recursion. | |
5900 | */ | |
5901 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) | |
f6186f49 | 5902 | { |
212a5a8f BC |
5903 | BlockDriverState *bs; |
5904 | ||
5905 | /* walk down the bs forest recursively */ | |
5906 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { | |
5907 | bool perm; | |
5908 | ||
b5042a36 | 5909 | /* try to recurse in this top level bs */ |
e6dc8a1f | 5910 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
212a5a8f BC |
5911 | |
5912 | /* candidate is the first non filter */ | |
5913 | if (perm) { | |
5914 | return true; | |
5915 | } | |
5916 | } | |
5917 | ||
5918 | return false; | |
f6186f49 | 5919 | } |
09158f00 BC |
5920 | |
5921 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) | |
5922 | { | |
5923 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); | |
5924 | if (!to_replace_bs) { | |
5925 | error_setg(errp, "Node name '%s' not found", node_name); | |
5926 | return NULL; | |
5927 | } | |
5928 | ||
5929 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { | |
5930 | return NULL; | |
5931 | } | |
5932 | ||
5933 | /* We don't want arbitrary node of the BDS chain to be replaced only the top | |
5934 | * most non filter in order to prevent data corruption. | |
5935 | * Another benefit is that this tests exclude backing files which are | |
5936 | * blocked by the backing blockers. | |
5937 | */ | |
5938 | if (!bdrv_is_first_non_filter(to_replace_bs)) { | |
5939 | error_setg(errp, "Only top most non filter can be replaced"); | |
5940 | return NULL; | |
5941 | } | |
5942 | ||
5943 | return to_replace_bs; | |
5944 | } | |
448ad91d ML |
5945 | |
5946 | void bdrv_io_plug(BlockDriverState *bs) | |
5947 | { | |
5948 | BlockDriver *drv = bs->drv; | |
5949 | if (drv && drv->bdrv_io_plug) { | |
5950 | drv->bdrv_io_plug(bs); | |
5951 | } else if (bs->file) { | |
5952 | bdrv_io_plug(bs->file); | |
5953 | } | |
5954 | } | |
5955 | ||
5956 | void bdrv_io_unplug(BlockDriverState *bs) | |
5957 | { | |
5958 | BlockDriver *drv = bs->drv; | |
5959 | if (drv && drv->bdrv_io_unplug) { | |
5960 | drv->bdrv_io_unplug(bs); | |
5961 | } else if (bs->file) { | |
5962 | bdrv_io_unplug(bs->file); | |
5963 | } | |
5964 | } | |
5965 | ||
5966 | void bdrv_flush_io_queue(BlockDriverState *bs) | |
5967 | { | |
5968 | BlockDriver *drv = bs->drv; | |
5969 | if (drv && drv->bdrv_flush_io_queue) { | |
5970 | drv->bdrv_flush_io_queue(bs); | |
5971 | } else if (bs->file) { | |
5972 | bdrv_flush_io_queue(bs->file); | |
5973 | } | |
5974 | } | |
91af7014 HR |
5975 | |
5976 | static bool append_open_options(QDict *d, BlockDriverState *bs) | |
5977 | { | |
5978 | const QDictEntry *entry; | |
5979 | bool found_any = false; | |
5980 | ||
5981 | for (entry = qdict_first(bs->options); entry; | |
5982 | entry = qdict_next(bs->options, entry)) | |
5983 | { | |
5984 | /* Only take options for this level and exclude all non-driver-specific | |
5985 | * options */ | |
5986 | if (!strchr(qdict_entry_key(entry), '.') && | |
5987 | strcmp(qdict_entry_key(entry), "node-name")) | |
5988 | { | |
5989 | qobject_incref(qdict_entry_value(entry)); | |
5990 | qdict_put_obj(d, qdict_entry_key(entry), qdict_entry_value(entry)); | |
5991 | found_any = true; | |
5992 | } | |
5993 | } | |
5994 | ||
5995 | return found_any; | |
5996 | } | |
5997 | ||
5998 | /* Updates the following BDS fields: | |
5999 | * - exact_filename: A filename which may be used for opening a block device | |
6000 | * which (mostly) equals the given BDS (even without any | |
6001 | * other options; so reading and writing must return the same | |
6002 | * results, but caching etc. may be different) | |
6003 | * - full_open_options: Options which, when given when opening a block device | |
6004 | * (without a filename), result in a BDS (mostly) | |
6005 | * equalling the given one | |
6006 | * - filename: If exact_filename is set, it is copied here. Otherwise, | |
6007 | * full_open_options is converted to a JSON object, prefixed with | |
6008 | * "json:" (for use through the JSON pseudo protocol) and put here. | |
6009 | */ | |
6010 | void bdrv_refresh_filename(BlockDriverState *bs) | |
6011 | { | |
6012 | BlockDriver *drv = bs->drv; | |
6013 | QDict *opts; | |
6014 | ||
6015 | if (!drv) { | |
6016 | return; | |
6017 | } | |
6018 | ||
6019 | /* This BDS's file name will most probably depend on its file's name, so | |
6020 | * refresh that first */ | |
6021 | if (bs->file) { | |
6022 | bdrv_refresh_filename(bs->file); | |
6023 | } | |
6024 | ||
6025 | if (drv->bdrv_refresh_filename) { | |
6026 | /* Obsolete information is of no use here, so drop the old file name | |
6027 | * information before refreshing it */ | |
6028 | bs->exact_filename[0] = '\0'; | |
6029 | if (bs->full_open_options) { | |
6030 | QDECREF(bs->full_open_options); | |
6031 | bs->full_open_options = NULL; | |
6032 | } | |
6033 | ||
6034 | drv->bdrv_refresh_filename(bs); | |
6035 | } else if (bs->file) { | |
6036 | /* Try to reconstruct valid information from the underlying file */ | |
6037 | bool has_open_options; | |
6038 | ||
6039 | bs->exact_filename[0] = '\0'; | |
6040 | if (bs->full_open_options) { | |
6041 | QDECREF(bs->full_open_options); | |
6042 | bs->full_open_options = NULL; | |
6043 | } | |
6044 | ||
6045 | opts = qdict_new(); | |
6046 | has_open_options = append_open_options(opts, bs); | |
6047 | ||
6048 | /* If no specific options have been given for this BDS, the filename of | |
6049 | * the underlying file should suffice for this one as well */ | |
6050 | if (bs->file->exact_filename[0] && !has_open_options) { | |
6051 | strcpy(bs->exact_filename, bs->file->exact_filename); | |
6052 | } | |
6053 | /* Reconstructing the full options QDict is simple for most format block | |
6054 | * drivers, as long as the full options are known for the underlying | |
6055 | * file BDS. The full options QDict of that file BDS should somehow | |
6056 | * contain a representation of the filename, therefore the following | |
6057 | * suffices without querying the (exact_)filename of this BDS. */ | |
6058 | if (bs->file->full_open_options) { | |
6059 | qdict_put_obj(opts, "driver", | |
6060 | QOBJECT(qstring_from_str(drv->format_name))); | |
6061 | QINCREF(bs->file->full_open_options); | |
6062 | qdict_put_obj(opts, "file", QOBJECT(bs->file->full_open_options)); | |
6063 | ||
6064 | bs->full_open_options = opts; | |
6065 | } else { | |
6066 | QDECREF(opts); | |
6067 | } | |
6068 | } else if (!bs->full_open_options && qdict_size(bs->options)) { | |
6069 | /* There is no underlying file BDS (at least referenced by BDS.file), | |
6070 | * so the full options QDict should be equal to the options given | |
6071 | * specifically for this block device when it was opened (plus the | |
6072 | * driver specification). | |
6073 | * Because those options don't change, there is no need to update | |
6074 | * full_open_options when it's already set. */ | |
6075 | ||
6076 | opts = qdict_new(); | |
6077 | append_open_options(opts, bs); | |
6078 | qdict_put_obj(opts, "driver", | |
6079 | QOBJECT(qstring_from_str(drv->format_name))); | |
6080 | ||
6081 | if (bs->exact_filename[0]) { | |
6082 | /* This may not work for all block protocol drivers (some may | |
6083 | * require this filename to be parsed), but we have to find some | |
6084 | * default solution here, so just include it. If some block driver | |
6085 | * does not support pure options without any filename at all or | |
6086 | * needs some special format of the options QDict, it needs to | |
6087 | * implement the driver-specific bdrv_refresh_filename() function. | |
6088 | */ | |
6089 | qdict_put_obj(opts, "filename", | |
6090 | QOBJECT(qstring_from_str(bs->exact_filename))); | |
6091 | } | |
6092 | ||
6093 | bs->full_open_options = opts; | |
6094 | } | |
6095 | ||
6096 | if (bs->exact_filename[0]) { | |
6097 | pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename); | |
6098 | } else if (bs->full_open_options) { | |
6099 | QString *json = qobject_to_json(QOBJECT(bs->full_open_options)); | |
6100 | snprintf(bs->filename, sizeof(bs->filename), "json:%s", | |
6101 | qstring_get_str(json)); | |
6102 | QDECREF(json); | |
6103 | } | |
6104 | } | |
5366d0c8 BC |
6105 | |
6106 | /* This accessor function purpose is to allow the device models to access the | |
6107 | * BlockAcctStats structure embedded inside a BlockDriverState without being | |
6108 | * aware of the BlockDriverState structure layout. | |
6109 | * It will go away when the BlockAcctStats structure will be moved inside | |
6110 | * the device models. | |
6111 | */ | |
6112 | BlockAcctStats *bdrv_get_stats(BlockDriverState *bs) | |
6113 | { | |
6114 | return &bs->stats; | |
6115 | } |