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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
6d519a5f | 26 | #include "trace.h" |
83c9089e | 27 | #include "monitor/monitor.h" |
737e150e PB |
28 | #include "block/block_int.h" |
29 | #include "block/blockjob.h" | |
1de7afc9 | 30 | #include "qemu/module.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qjson.h" |
9c17d615 | 32 | #include "sysemu/sysemu.h" |
1de7afc9 | 33 | #include "qemu/notify.h" |
737e150e | 34 | #include "block/coroutine.h" |
b2023818 | 35 | #include "qmp-commands.h" |
1de7afc9 | 36 | #include "qemu/timer.h" |
fc01f7e7 | 37 | |
71e72a19 | 38 | #ifdef CONFIG_BSD |
7674e7bf FB |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> | |
41 | #include <sys/ioctl.h> | |
72cf2d4f | 42 | #include <sys/queue.h> |
c5e97233 | 43 | #ifndef __DragonFly__ |
7674e7bf FB |
44 | #include <sys/disk.h> |
45 | #endif | |
c5e97233 | 46 | #endif |
7674e7bf | 47 | |
49dc768d AL |
48 | #ifdef _WIN32 |
49 | #include <windows.h> | |
50 | #endif | |
51 | ||
1c9805a3 SH |
52 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
53 | ||
470c0504 SH |
54 | typedef enum { |
55 | BDRV_REQ_COPY_ON_READ = 0x1, | |
f08f2dda | 56 | BDRV_REQ_ZERO_WRITE = 0x2, |
470c0504 SH |
57 | } BdrvRequestFlags; |
58 | ||
7d4b4ba5 | 59 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
f141eafe AL |
60 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
61 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 62 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
63 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
64 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 65 | BlockDriverCompletionFunc *cb, void *opaque); |
f9f05dc5 KW |
66 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
67 | int64_t sector_num, int nb_sectors, | |
68 | QEMUIOVector *iov); | |
69 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
70 | int64_t sector_num, int nb_sectors, | |
71 | QEMUIOVector *iov); | |
c5fbe571 | 72 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
470c0504 SH |
73 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
74 | BdrvRequestFlags flags); | |
1c9805a3 | 75 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
f08f2dda SH |
76 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
77 | BdrvRequestFlags flags); | |
b2a61371 SH |
78 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
79 | int64_t sector_num, | |
80 | QEMUIOVector *qiov, | |
81 | int nb_sectors, | |
82 | BlockDriverCompletionFunc *cb, | |
83 | void *opaque, | |
8c5873d6 | 84 | bool is_write); |
b2a61371 | 85 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
621f0589 KW |
86 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
87 | int64_t sector_num, int nb_sectors); | |
ec530c81 | 88 | |
98f90dba ZYW |
89 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
90 | bool is_write, double elapsed_time, uint64_t *wait); | |
91 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
92 | double elapsed_time, uint64_t *wait); | |
93 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
94 | bool is_write, int64_t *wait); | |
95 | ||
1b7bdbc1 SH |
96 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
97 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 98 | |
8a22f02a SH |
99 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
100 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 101 | |
eb852011 MA |
102 | /* If non-zero, use only whitelisted block drivers */ |
103 | static int use_bdrv_whitelist; | |
104 | ||
9e0b22f4 SH |
105 | #ifdef _WIN32 |
106 | static int is_windows_drive_prefix(const char *filename) | |
107 | { | |
108 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
109 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
110 | filename[1] == ':'); | |
111 | } | |
112 | ||
113 | int is_windows_drive(const char *filename) | |
114 | { | |
115 | if (is_windows_drive_prefix(filename) && | |
116 | filename[2] == '\0') | |
117 | return 1; | |
118 | if (strstart(filename, "\\\\.\\", NULL) || | |
119 | strstart(filename, "//./", NULL)) | |
120 | return 1; | |
121 | return 0; | |
122 | } | |
123 | #endif | |
124 | ||
0563e191 | 125 | /* throttling disk I/O limits */ |
98f90dba ZYW |
126 | void bdrv_io_limits_disable(BlockDriverState *bs) |
127 | { | |
128 | bs->io_limits_enabled = false; | |
129 | ||
130 | while (qemu_co_queue_next(&bs->throttled_reqs)); | |
131 | ||
132 | if (bs->block_timer) { | |
133 | qemu_del_timer(bs->block_timer); | |
134 | qemu_free_timer(bs->block_timer); | |
135 | bs->block_timer = NULL; | |
136 | } | |
137 | ||
138 | bs->slice_start = 0; | |
139 | bs->slice_end = 0; | |
98f90dba ZYW |
140 | } |
141 | ||
0563e191 ZYW |
142 | static void bdrv_block_timer(void *opaque) |
143 | { | |
144 | BlockDriverState *bs = opaque; | |
145 | ||
146 | qemu_co_queue_next(&bs->throttled_reqs); | |
147 | } | |
148 | ||
149 | void bdrv_io_limits_enable(BlockDriverState *bs) | |
150 | { | |
151 | qemu_co_queue_init(&bs->throttled_reqs); | |
152 | bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); | |
0563e191 ZYW |
153 | bs->io_limits_enabled = true; |
154 | } | |
155 | ||
156 | bool bdrv_io_limits_enabled(BlockDriverState *bs) | |
157 | { | |
158 | BlockIOLimit *io_limits = &bs->io_limits; | |
159 | return io_limits->bps[BLOCK_IO_LIMIT_READ] | |
160 | || io_limits->bps[BLOCK_IO_LIMIT_WRITE] | |
161 | || io_limits->bps[BLOCK_IO_LIMIT_TOTAL] | |
162 | || io_limits->iops[BLOCK_IO_LIMIT_READ] | |
163 | || io_limits->iops[BLOCK_IO_LIMIT_WRITE] | |
164 | || io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; | |
165 | } | |
166 | ||
98f90dba ZYW |
167 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
168 | bool is_write, int nb_sectors) | |
169 | { | |
170 | int64_t wait_time = -1; | |
171 | ||
172 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
173 | qemu_co_queue_wait(&bs->throttled_reqs); | |
174 | } | |
175 | ||
176 | /* In fact, we hope to keep each request's timing, in FIFO mode. The next | |
177 | * throttled requests will not be dequeued until the current request is | |
178 | * allowed to be serviced. So if the current request still exceeds the | |
179 | * limits, it will be inserted to the head. All requests followed it will | |
180 | * be still in throttled_reqs queue. | |
181 | */ | |
182 | ||
183 | while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) { | |
184 | qemu_mod_timer(bs->block_timer, | |
185 | wait_time + qemu_get_clock_ns(vm_clock)); | |
186 | qemu_co_queue_wait_insert_head(&bs->throttled_reqs); | |
187 | } | |
188 | ||
189 | qemu_co_queue_next(&bs->throttled_reqs); | |
190 | } | |
191 | ||
9e0b22f4 SH |
192 | /* check if the path starts with "<protocol>:" */ |
193 | static int path_has_protocol(const char *path) | |
194 | { | |
947995c0 PB |
195 | const char *p; |
196 | ||
9e0b22f4 SH |
197 | #ifdef _WIN32 |
198 | if (is_windows_drive(path) || | |
199 | is_windows_drive_prefix(path)) { | |
200 | return 0; | |
201 | } | |
947995c0 PB |
202 | p = path + strcspn(path, ":/\\"); |
203 | #else | |
204 | p = path + strcspn(path, ":/"); | |
9e0b22f4 SH |
205 | #endif |
206 | ||
947995c0 | 207 | return *p == ':'; |
9e0b22f4 SH |
208 | } |
209 | ||
83f64091 | 210 | int path_is_absolute(const char *path) |
3b0d4f61 | 211 | { |
21664424 FB |
212 | #ifdef _WIN32 |
213 | /* specific case for names like: "\\.\d:" */ | |
f53f4da9 | 214 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
21664424 | 215 | return 1; |
f53f4da9 PB |
216 | } |
217 | return (*path == '/' || *path == '\\'); | |
3b9f94e1 | 218 | #else |
f53f4da9 | 219 | return (*path == '/'); |
3b9f94e1 | 220 | #endif |
3b0d4f61 FB |
221 | } |
222 | ||
83f64091 FB |
223 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
224 | path to it by considering it is relative to base_path. URL are | |
225 | supported. */ | |
226 | void path_combine(char *dest, int dest_size, | |
227 | const char *base_path, | |
228 | const char *filename) | |
3b0d4f61 | 229 | { |
83f64091 FB |
230 | const char *p, *p1; |
231 | int len; | |
232 | ||
233 | if (dest_size <= 0) | |
234 | return; | |
235 | if (path_is_absolute(filename)) { | |
236 | pstrcpy(dest, dest_size, filename); | |
237 | } else { | |
238 | p = strchr(base_path, ':'); | |
239 | if (p) | |
240 | p++; | |
241 | else | |
242 | p = base_path; | |
3b9f94e1 FB |
243 | p1 = strrchr(base_path, '/'); |
244 | #ifdef _WIN32 | |
245 | { | |
246 | const char *p2; | |
247 | p2 = strrchr(base_path, '\\'); | |
248 | if (!p1 || p2 > p1) | |
249 | p1 = p2; | |
250 | } | |
251 | #endif | |
83f64091 FB |
252 | if (p1) |
253 | p1++; | |
254 | else | |
255 | p1 = base_path; | |
256 | if (p1 > p) | |
257 | p = p1; | |
258 | len = p - base_path; | |
259 | if (len > dest_size - 1) | |
260 | len = dest_size - 1; | |
261 | memcpy(dest, base_path, len); | |
262 | dest[len] = '\0'; | |
263 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 264 | } |
3b0d4f61 FB |
265 | } |
266 | ||
dc5a1371 PB |
267 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
268 | { | |
269 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { | |
270 | pstrcpy(dest, sz, bs->backing_file); | |
271 | } else { | |
272 | path_combine(dest, sz, bs->filename, bs->backing_file); | |
273 | } | |
274 | } | |
275 | ||
5efa9d5a | 276 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 277 | { |
8c5873d6 SH |
278 | /* Block drivers without coroutine functions need emulation */ |
279 | if (!bdrv->bdrv_co_readv) { | |
f9f05dc5 KW |
280 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
281 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
282 | ||
f8c35c1d SH |
283 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
284 | * the block driver lacks aio we need to emulate that too. | |
285 | */ | |
f9f05dc5 KW |
286 | if (!bdrv->bdrv_aio_readv) { |
287 | /* add AIO emulation layer */ | |
288 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
289 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
f9f05dc5 | 290 | } |
83f64091 | 291 | } |
b2e12bc6 | 292 | |
8a22f02a | 293 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 294 | } |
b338082b FB |
295 | |
296 | /* create a new block device (by default it is empty) */ | |
297 | BlockDriverState *bdrv_new(const char *device_name) | |
298 | { | |
1b7bdbc1 | 299 | BlockDriverState *bs; |
b338082b | 300 | |
7267c094 | 301 | bs = g_malloc0(sizeof(BlockDriverState)); |
b338082b | 302 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 303 | if (device_name[0] != '\0') { |
1b7bdbc1 | 304 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 305 | } |
28a7282a | 306 | bdrv_iostatus_disable(bs); |
d7d512f6 | 307 | notifier_list_init(&bs->close_notifiers); |
d616b224 | 308 | notifier_with_return_list_init(&bs->before_write_notifiers); |
d7d512f6 | 309 | |
b338082b FB |
310 | return bs; |
311 | } | |
312 | ||
d7d512f6 PB |
313 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
314 | { | |
315 | notifier_list_add(&bs->close_notifiers, notify); | |
316 | } | |
317 | ||
ea2384d3 FB |
318 | BlockDriver *bdrv_find_format(const char *format_name) |
319 | { | |
320 | BlockDriver *drv1; | |
8a22f02a SH |
321 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
322 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 323 | return drv1; |
8a22f02a | 324 | } |
ea2384d3 FB |
325 | } |
326 | return NULL; | |
327 | } | |
328 | ||
b64ec4e4 | 329 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
eb852011 | 330 | { |
b64ec4e4 FZ |
331 | static const char *whitelist_rw[] = { |
332 | CONFIG_BDRV_RW_WHITELIST | |
333 | }; | |
334 | static const char *whitelist_ro[] = { | |
335 | CONFIG_BDRV_RO_WHITELIST | |
eb852011 MA |
336 | }; |
337 | const char **p; | |
338 | ||
b64ec4e4 | 339 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
eb852011 | 340 | return 1; /* no whitelist, anything goes */ |
b64ec4e4 | 341 | } |
eb852011 | 342 | |
b64ec4e4 | 343 | for (p = whitelist_rw; *p; p++) { |
eb852011 MA |
344 | if (!strcmp(drv->format_name, *p)) { |
345 | return 1; | |
346 | } | |
347 | } | |
b64ec4e4 FZ |
348 | if (read_only) { |
349 | for (p = whitelist_ro; *p; p++) { | |
350 | if (!strcmp(drv->format_name, *p)) { | |
351 | return 1; | |
352 | } | |
353 | } | |
354 | } | |
eb852011 MA |
355 | return 0; |
356 | } | |
357 | ||
b64ec4e4 FZ |
358 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
359 | bool read_only) | |
eb852011 MA |
360 | { |
361 | BlockDriver *drv = bdrv_find_format(format_name); | |
b64ec4e4 | 362 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
eb852011 MA |
363 | } |
364 | ||
5b7e1542 ZYW |
365 | typedef struct CreateCo { |
366 | BlockDriver *drv; | |
367 | char *filename; | |
368 | QEMUOptionParameter *options; | |
369 | int ret; | |
370 | } CreateCo; | |
371 | ||
372 | static void coroutine_fn bdrv_create_co_entry(void *opaque) | |
373 | { | |
374 | CreateCo *cco = opaque; | |
375 | assert(cco->drv); | |
376 | ||
377 | cco->ret = cco->drv->bdrv_create(cco->filename, cco->options); | |
378 | } | |
379 | ||
0e7e1989 KW |
380 | int bdrv_create(BlockDriver *drv, const char* filename, |
381 | QEMUOptionParameter *options) | |
ea2384d3 | 382 | { |
5b7e1542 ZYW |
383 | int ret; |
384 | ||
385 | Coroutine *co; | |
386 | CreateCo cco = { | |
387 | .drv = drv, | |
388 | .filename = g_strdup(filename), | |
389 | .options = options, | |
390 | .ret = NOT_DONE, | |
391 | }; | |
392 | ||
393 | if (!drv->bdrv_create) { | |
80168bff LC |
394 | ret = -ENOTSUP; |
395 | goto out; | |
5b7e1542 ZYW |
396 | } |
397 | ||
398 | if (qemu_in_coroutine()) { | |
399 | /* Fast-path if already in coroutine context */ | |
400 | bdrv_create_co_entry(&cco); | |
401 | } else { | |
402 | co = qemu_coroutine_create(bdrv_create_co_entry); | |
403 | qemu_coroutine_enter(co, &cco); | |
404 | while (cco.ret == NOT_DONE) { | |
405 | qemu_aio_wait(); | |
406 | } | |
407 | } | |
408 | ||
409 | ret = cco.ret; | |
0e7e1989 | 410 | |
80168bff LC |
411 | out: |
412 | g_free(cco.filename); | |
5b7e1542 | 413 | return ret; |
ea2384d3 FB |
414 | } |
415 | ||
84a12e66 CH |
416 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
417 | { | |
418 | BlockDriver *drv; | |
419 | ||
98289620 | 420 | drv = bdrv_find_protocol(filename, true); |
84a12e66 | 421 | if (drv == NULL) { |
16905d71 | 422 | return -ENOENT; |
84a12e66 CH |
423 | } |
424 | ||
425 | return bdrv_create(drv, filename, options); | |
426 | } | |
427 | ||
eba25057 JM |
428 | /* |
429 | * Create a uniquely-named empty temporary file. | |
430 | * Return 0 upon success, otherwise a negative errno value. | |
431 | */ | |
432 | int get_tmp_filename(char *filename, int size) | |
d5249393 | 433 | { |
eba25057 | 434 | #ifdef _WIN32 |
3b9f94e1 | 435 | char temp_dir[MAX_PATH]; |
eba25057 JM |
436 | /* GetTempFileName requires that its output buffer (4th param) |
437 | have length MAX_PATH or greater. */ | |
438 | assert(size >= MAX_PATH); | |
439 | return (GetTempPath(MAX_PATH, temp_dir) | |
440 | && GetTempFileName(temp_dir, "qem", 0, filename) | |
441 | ? 0 : -GetLastError()); | |
d5249393 | 442 | #else |
67b915a5 | 443 | int fd; |
7ccfb2eb | 444 | const char *tmpdir; |
0badc1ee AJ |
445 | tmpdir = getenv("TMPDIR"); |
446 | if (!tmpdir) | |
447 | tmpdir = "/tmp"; | |
eba25057 JM |
448 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
449 | return -EOVERFLOW; | |
450 | } | |
ea2384d3 | 451 | fd = mkstemp(filename); |
fe235a06 DH |
452 | if (fd < 0) { |
453 | return -errno; | |
454 | } | |
455 | if (close(fd) != 0) { | |
456 | unlink(filename); | |
eba25057 JM |
457 | return -errno; |
458 | } | |
459 | return 0; | |
d5249393 | 460 | #endif |
eba25057 | 461 | } |
fc01f7e7 | 462 | |
84a12e66 CH |
463 | /* |
464 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
465 | * recognized as a host CDROM. | |
466 | */ | |
467 | static BlockDriver *find_hdev_driver(const char *filename) | |
468 | { | |
469 | int score_max = 0, score; | |
470 | BlockDriver *drv = NULL, *d; | |
471 | ||
472 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
473 | if (d->bdrv_probe_device) { | |
474 | score = d->bdrv_probe_device(filename); | |
475 | if (score > score_max) { | |
476 | score_max = score; | |
477 | drv = d; | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
482 | return drv; | |
483 | } | |
484 | ||
98289620 KW |
485 | BlockDriver *bdrv_find_protocol(const char *filename, |
486 | bool allow_protocol_prefix) | |
83f64091 FB |
487 | { |
488 | BlockDriver *drv1; | |
489 | char protocol[128]; | |
1cec71e3 | 490 | int len; |
83f64091 | 491 | const char *p; |
19cb3738 | 492 | |
66f82cee KW |
493 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
494 | ||
39508e7a CH |
495 | /* |
496 | * XXX(hch): we really should not let host device detection | |
497 | * override an explicit protocol specification, but moving this | |
498 | * later breaks access to device names with colons in them. | |
499 | * Thanks to the brain-dead persistent naming schemes on udev- | |
500 | * based Linux systems those actually are quite common. | |
501 | */ | |
502 | drv1 = find_hdev_driver(filename); | |
503 | if (drv1) { | |
504 | return drv1; | |
505 | } | |
506 | ||
98289620 | 507 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
39508e7a | 508 | return bdrv_find_format("file"); |
84a12e66 | 509 | } |
98289620 | 510 | |
9e0b22f4 SH |
511 | p = strchr(filename, ':'); |
512 | assert(p != NULL); | |
1cec71e3 AL |
513 | len = p - filename; |
514 | if (len > sizeof(protocol) - 1) | |
515 | len = sizeof(protocol) - 1; | |
516 | memcpy(protocol, filename, len); | |
517 | protocol[len] = '\0'; | |
8a22f02a | 518 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 519 | if (drv1->protocol_name && |
8a22f02a | 520 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 521 | return drv1; |
8a22f02a | 522 | } |
83f64091 FB |
523 | } |
524 | return NULL; | |
525 | } | |
526 | ||
f500a6d3 KW |
527 | static int find_image_format(BlockDriverState *bs, const char *filename, |
528 | BlockDriver **pdrv) | |
f3a5d3f8 | 529 | { |
f500a6d3 | 530 | int score, score_max; |
f3a5d3f8 CH |
531 | BlockDriver *drv1, *drv; |
532 | uint8_t buf[2048]; | |
f500a6d3 | 533 | int ret = 0; |
f8ea0b00 | 534 | |
08a00559 | 535 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
8e895599 | 536 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
c98ac35d SW |
537 | drv = bdrv_find_format("raw"); |
538 | if (!drv) { | |
539 | ret = -ENOENT; | |
540 | } | |
541 | *pdrv = drv; | |
542 | return ret; | |
1a396859 | 543 | } |
f8ea0b00 | 544 | |
83f64091 | 545 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
83f64091 | 546 | if (ret < 0) { |
c98ac35d SW |
547 | *pdrv = NULL; |
548 | return ret; | |
83f64091 FB |
549 | } |
550 | ||
ea2384d3 | 551 | score_max = 0; |
84a12e66 | 552 | drv = NULL; |
8a22f02a | 553 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
554 | if (drv1->bdrv_probe) { |
555 | score = drv1->bdrv_probe(buf, ret, filename); | |
556 | if (score > score_max) { | |
557 | score_max = score; | |
558 | drv = drv1; | |
559 | } | |
0849bf08 | 560 | } |
fc01f7e7 | 561 | } |
c98ac35d SW |
562 | if (!drv) { |
563 | ret = -ENOENT; | |
564 | } | |
565 | *pdrv = drv; | |
566 | return ret; | |
ea2384d3 FB |
567 | } |
568 | ||
51762288 SH |
569 | /** |
570 | * Set the current 'total_sectors' value | |
571 | */ | |
572 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
573 | { | |
574 | BlockDriver *drv = bs->drv; | |
575 | ||
396759ad NB |
576 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
577 | if (bs->sg) | |
578 | return 0; | |
579 | ||
51762288 SH |
580 | /* query actual device if possible, otherwise just trust the hint */ |
581 | if (drv->bdrv_getlength) { | |
582 | int64_t length = drv->bdrv_getlength(bs); | |
583 | if (length < 0) { | |
584 | return length; | |
585 | } | |
586 | hint = length >> BDRV_SECTOR_BITS; | |
587 | } | |
588 | ||
589 | bs->total_sectors = hint; | |
590 | return 0; | |
591 | } | |
592 | ||
9e8f1835 PB |
593 | /** |
594 | * Set open flags for a given discard mode | |
595 | * | |
596 | * Return 0 on success, -1 if the discard mode was invalid. | |
597 | */ | |
598 | int bdrv_parse_discard_flags(const char *mode, int *flags) | |
599 | { | |
600 | *flags &= ~BDRV_O_UNMAP; | |
601 | ||
602 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { | |
603 | /* do nothing */ | |
604 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { | |
605 | *flags |= BDRV_O_UNMAP; | |
606 | } else { | |
607 | return -1; | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
c3993cdc SH |
613 | /** |
614 | * Set open flags for a given cache mode | |
615 | * | |
616 | * Return 0 on success, -1 if the cache mode was invalid. | |
617 | */ | |
618 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
619 | { | |
620 | *flags &= ~BDRV_O_CACHE_MASK; | |
621 | ||
622 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
623 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
92196b2f SH |
624 | } else if (!strcmp(mode, "directsync")) { |
625 | *flags |= BDRV_O_NOCACHE; | |
c3993cdc SH |
626 | } else if (!strcmp(mode, "writeback")) { |
627 | *flags |= BDRV_O_CACHE_WB; | |
628 | } else if (!strcmp(mode, "unsafe")) { | |
629 | *flags |= BDRV_O_CACHE_WB; | |
630 | *flags |= BDRV_O_NO_FLUSH; | |
631 | } else if (!strcmp(mode, "writethrough")) { | |
632 | /* this is the default */ | |
633 | } else { | |
634 | return -1; | |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
53fec9d3 SH |
640 | /** |
641 | * The copy-on-read flag is actually a reference count so multiple users may | |
642 | * use the feature without worrying about clobbering its previous state. | |
643 | * Copy-on-read stays enabled until all users have called to disable it. | |
644 | */ | |
645 | void bdrv_enable_copy_on_read(BlockDriverState *bs) | |
646 | { | |
647 | bs->copy_on_read++; | |
648 | } | |
649 | ||
650 | void bdrv_disable_copy_on_read(BlockDriverState *bs) | |
651 | { | |
652 | assert(bs->copy_on_read > 0); | |
653 | bs->copy_on_read--; | |
654 | } | |
655 | ||
7b272452 KW |
656 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
657 | { | |
658 | int open_flags = flags | BDRV_O_CACHE_WB; | |
659 | ||
660 | /* | |
661 | * Clear flags that are internal to the block layer before opening the | |
662 | * image. | |
663 | */ | |
664 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
665 | ||
666 | /* | |
667 | * Snapshots should be writable. | |
668 | */ | |
669 | if (bs->is_temporary) { | |
670 | open_flags |= BDRV_O_RDWR; | |
671 | } | |
672 | ||
673 | return open_flags; | |
674 | } | |
675 | ||
57915332 KW |
676 | /* |
677 | * Common part for opening disk images and files | |
b6ad491a KW |
678 | * |
679 | * Removes all processed options from *options. | |
57915332 | 680 | */ |
f500a6d3 | 681 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
035fccdf | 682 | QDict *options, int flags, BlockDriver *drv) |
57915332 KW |
683 | { |
684 | int ret, open_flags; | |
035fccdf | 685 | const char *filename; |
57915332 KW |
686 | |
687 | assert(drv != NULL); | |
6405875c | 688 | assert(bs->file == NULL); |
707ff828 | 689 | assert(options != NULL && bs->options != options); |
57915332 | 690 | |
45673671 KW |
691 | if (file != NULL) { |
692 | filename = file->filename; | |
693 | } else { | |
694 | filename = qdict_get_try_str(options, "filename"); | |
695 | } | |
696 | ||
697 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); | |
28dcee10 | 698 | |
5d186eb0 KW |
699 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
700 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) | |
701 | * and return immediately. */ | |
702 | if (file != NULL && drv->bdrv_file_open) { | |
703 | bdrv_swap(file, bs); | |
704 | return 0; | |
705 | } | |
706 | ||
57915332 | 707 | bs->open_flags = flags; |
57915332 | 708 | bs->buffer_alignment = 512; |
b64ec4e4 FZ |
709 | open_flags = bdrv_open_flags(bs, flags); |
710 | bs->read_only = !(open_flags & BDRV_O_RDWR); | |
711 | ||
712 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { | |
713 | return -ENOTSUP; | |
714 | } | |
57915332 | 715 | |
53fec9d3 | 716 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
b64ec4e4 | 717 | if (!bs->read_only && (flags & BDRV_O_COPY_ON_READ)) { |
53fec9d3 SH |
718 | bdrv_enable_copy_on_read(bs); |
719 | } | |
720 | ||
c2ad1b0c KW |
721 | if (filename != NULL) { |
722 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
723 | } else { | |
724 | bs->filename[0] = '\0'; | |
725 | } | |
57915332 | 726 | |
57915332 | 727 | bs->drv = drv; |
7267c094 | 728 | bs->opaque = g_malloc0(drv->instance_size); |
57915332 | 729 | |
03f541bd | 730 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
e7c63796 | 731 | |
66f82cee KW |
732 | /* Open the image, either directly or using a protocol */ |
733 | if (drv->bdrv_file_open) { | |
5d186eb0 KW |
734 | assert(file == NULL); |
735 | assert(drv->bdrv_parse_filename || filename != NULL); | |
56d1b4d2 | 736 | ret = drv->bdrv_file_open(bs, options, open_flags); |
f500a6d3 | 737 | } else { |
2af5ef70 KW |
738 | if (file == NULL) { |
739 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't use '%s' as a " | |
740 | "block driver for the protocol level", | |
741 | drv->format_name); | |
742 | ret = -EINVAL; | |
743 | goto free_and_fail; | |
744 | } | |
f500a6d3 KW |
745 | assert(file != NULL); |
746 | bs->file = file; | |
b6ad491a | 747 | ret = drv->bdrv_open(bs, options, open_flags); |
66f82cee KW |
748 | } |
749 | ||
57915332 KW |
750 | if (ret < 0) { |
751 | goto free_and_fail; | |
752 | } | |
753 | ||
51762288 SH |
754 | ret = refresh_total_sectors(bs, bs->total_sectors); |
755 | if (ret < 0) { | |
756 | goto free_and_fail; | |
57915332 | 757 | } |
51762288 | 758 | |
57915332 KW |
759 | #ifndef _WIN32 |
760 | if (bs->is_temporary) { | |
c2ad1b0c | 761 | assert(filename != NULL); |
57915332 KW |
762 | unlink(filename); |
763 | } | |
764 | #endif | |
765 | return 0; | |
766 | ||
767 | free_and_fail: | |
f500a6d3 | 768 | bs->file = NULL; |
7267c094 | 769 | g_free(bs->opaque); |
57915332 KW |
770 | bs->opaque = NULL; |
771 | bs->drv = NULL; | |
772 | return ret; | |
773 | } | |
774 | ||
b6ce07aa KW |
775 | /* |
776 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
787e4a85 KW |
777 | * |
778 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
779 | * empty set of options. The reference to the QDict belongs to the block layer | |
780 | * after the call (even on failure), so if the caller intends to reuse the | |
781 | * dictionary, it needs to use QINCREF() before calling bdrv_file_open. | |
b6ce07aa | 782 | */ |
787e4a85 KW |
783 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, |
784 | QDict *options, int flags) | |
ea2384d3 | 785 | { |
83f64091 | 786 | BlockDriverState *bs; |
6db95603 | 787 | BlockDriver *drv; |
c2ad1b0c | 788 | const char *drvname; |
98289620 | 789 | bool allow_protocol_prefix = false; |
83f64091 FB |
790 | int ret; |
791 | ||
707ff828 KW |
792 | /* NULL means an empty set of options */ |
793 | if (options == NULL) { | |
794 | options = qdict_new(); | |
795 | } | |
796 | ||
83f64091 | 797 | bs = bdrv_new(""); |
707ff828 KW |
798 | bs->options = options; |
799 | options = qdict_clone_shallow(options); | |
800 | ||
035fccdf KW |
801 | /* Fetch the file name from the options QDict if necessary */ |
802 | if (!filename) { | |
803 | filename = qdict_get_try_str(options, "filename"); | |
804 | } else if (filename && !qdict_haskey(options, "filename")) { | |
805 | qdict_put(options, "filename", qstring_from_str(filename)); | |
98289620 | 806 | allow_protocol_prefix = true; |
035fccdf KW |
807 | } else { |
808 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't specify 'file' and " | |
809 | "'filename' options at the same time"); | |
810 | ret = -EINVAL; | |
811 | goto fail; | |
812 | } | |
813 | ||
c2ad1b0c KW |
814 | /* Find the right block driver */ |
815 | drvname = qdict_get_try_str(options, "driver"); | |
816 | if (drvname) { | |
b64ec4e4 | 817 | drv = bdrv_find_whitelisted_format(drvname, !(flags & BDRV_O_RDWR)); |
c2ad1b0c KW |
818 | qdict_del(options, "driver"); |
819 | } else if (filename) { | |
98289620 KW |
820 | drv = bdrv_find_protocol(filename, allow_protocol_prefix); |
821 | if (!drv) { | |
822 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Unknown protocol"); | |
823 | } | |
c2ad1b0c KW |
824 | } else { |
825 | qerror_report(ERROR_CLASS_GENERIC_ERROR, | |
826 | "Must specify either driver or file"); | |
827 | drv = NULL; | |
828 | } | |
829 | ||
830 | if (!drv) { | |
831 | ret = -ENOENT; | |
832 | goto fail; | |
833 | } | |
834 | ||
835 | /* Parse the filename and open it */ | |
836 | if (drv->bdrv_parse_filename && filename) { | |
6963a30d KW |
837 | Error *local_err = NULL; |
838 | drv->bdrv_parse_filename(filename, options, &local_err); | |
839 | if (error_is_set(&local_err)) { | |
840 | qerror_report_err(local_err); | |
841 | error_free(local_err); | |
842 | ret = -EINVAL; | |
843 | goto fail; | |
844 | } | |
56d1b4d2 | 845 | qdict_del(options, "filename"); |
c2ad1b0c KW |
846 | } else if (!drv->bdrv_parse_filename && !filename) { |
847 | qerror_report(ERROR_CLASS_GENERIC_ERROR, | |
848 | "The '%s' block driver requires a file name", | |
849 | drv->format_name); | |
850 | ret = -EINVAL; | |
851 | goto fail; | |
6963a30d KW |
852 | } |
853 | ||
035fccdf | 854 | ret = bdrv_open_common(bs, NULL, options, flags, drv); |
83f64091 | 855 | if (ret < 0) { |
707ff828 KW |
856 | goto fail; |
857 | } | |
858 | ||
859 | /* Check if any unknown options were used */ | |
860 | if (qdict_size(options) != 0) { | |
861 | const QDictEntry *entry = qdict_first(options); | |
862 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block protocol '%s' doesn't " | |
863 | "support the option '%s'", | |
864 | drv->format_name, entry->key); | |
865 | ret = -EINVAL; | |
866 | goto fail; | |
3b0d4f61 | 867 | } |
707ff828 KW |
868 | QDECREF(options); |
869 | ||
71d0770c | 870 | bs->growable = 1; |
83f64091 FB |
871 | *pbs = bs; |
872 | return 0; | |
707ff828 KW |
873 | |
874 | fail: | |
875 | QDECREF(options); | |
876 | if (!bs->drv) { | |
877 | QDECREF(bs->options); | |
878 | } | |
879 | bdrv_delete(bs); | |
880 | return ret; | |
83f64091 FB |
881 | } |
882 | ||
31ca6d07 KW |
883 | /* |
884 | * Opens the backing file for a BlockDriverState if not yet open | |
885 | * | |
886 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
887 | * empty set of options. The reference to the QDict is transferred to this | |
888 | * function (even on failure), so if the caller intends to reuse the dictionary, | |
889 | * it needs to use QINCREF() before calling bdrv_file_open. | |
890 | */ | |
891 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options) | |
9156df12 PB |
892 | { |
893 | char backing_filename[PATH_MAX]; | |
894 | int back_flags, ret; | |
895 | BlockDriver *back_drv = NULL; | |
896 | ||
897 | if (bs->backing_hd != NULL) { | |
31ca6d07 | 898 | QDECREF(options); |
9156df12 PB |
899 | return 0; |
900 | } | |
901 | ||
31ca6d07 KW |
902 | /* NULL means an empty set of options */ |
903 | if (options == NULL) { | |
904 | options = qdict_new(); | |
905 | } | |
906 | ||
9156df12 | 907 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
1cb6f506 KW |
908 | if (qdict_haskey(options, "file.filename")) { |
909 | backing_filename[0] = '\0'; | |
910 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { | |
31ca6d07 | 911 | QDECREF(options); |
9156df12 PB |
912 | return 0; |
913 | } | |
914 | ||
915 | bs->backing_hd = bdrv_new(""); | |
916 | bdrv_get_full_backing_filename(bs, backing_filename, | |
917 | sizeof(backing_filename)); | |
918 | ||
919 | if (bs->backing_format[0] != '\0') { | |
920 | back_drv = bdrv_find_format(bs->backing_format); | |
921 | } | |
922 | ||
923 | /* backing files always opened read-only */ | |
924 | back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT); | |
925 | ||
31ca6d07 KW |
926 | ret = bdrv_open(bs->backing_hd, |
927 | *backing_filename ? backing_filename : NULL, options, | |
de9c0cec | 928 | back_flags, back_drv); |
9156df12 PB |
929 | if (ret < 0) { |
930 | bdrv_delete(bs->backing_hd); | |
931 | bs->backing_hd = NULL; | |
932 | bs->open_flags |= BDRV_O_NO_BACKING; | |
933 | return ret; | |
934 | } | |
935 | return 0; | |
936 | } | |
937 | ||
707ff828 KW |
938 | static void extract_subqdict(QDict *src, QDict **dst, const char *start) |
939 | { | |
940 | const QDictEntry *entry, *next; | |
941 | const char *p; | |
942 | ||
943 | *dst = qdict_new(); | |
944 | entry = qdict_first(src); | |
945 | ||
946 | while (entry != NULL) { | |
947 | next = qdict_next(src, entry); | |
948 | if (strstart(entry->key, start, &p)) { | |
949 | qobject_incref(entry->value); | |
950 | qdict_put_obj(*dst, p, entry->value); | |
951 | qdict_del(src, entry->key); | |
952 | } | |
953 | entry = next; | |
954 | } | |
955 | } | |
956 | ||
b6ce07aa KW |
957 | /* |
958 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
de9c0cec KW |
959 | * |
960 | * options is a QDict of options to pass to the block drivers, or NULL for an | |
961 | * empty set of options. The reference to the QDict belongs to the block layer | |
962 | * after the call (even on failure), so if the caller intends to reuse the | |
963 | * dictionary, it needs to use QINCREF() before calling bdrv_open. | |
b6ce07aa | 964 | */ |
de9c0cec KW |
965 | int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options, |
966 | int flags, BlockDriver *drv) | |
ea2384d3 | 967 | { |
b6ce07aa | 968 | int ret; |
89c9bc3d SW |
969 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
970 | char tmp_filename[PATH_MAX + 1]; | |
f500a6d3 | 971 | BlockDriverState *file = NULL; |
707ff828 | 972 | QDict *file_options = NULL; |
712e7874 | 973 | |
de9c0cec KW |
974 | /* NULL means an empty set of options */ |
975 | if (options == NULL) { | |
976 | options = qdict_new(); | |
977 | } | |
978 | ||
979 | bs->options = options; | |
b6ad491a | 980 | options = qdict_clone_shallow(options); |
de9c0cec KW |
981 | |
982 | /* For snapshot=on, create a temporary qcow2 overlay */ | |
83f64091 | 983 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
984 | BlockDriverState *bs1; |
985 | int64_t total_size; | |
91a073a9 | 986 | BlockDriver *bdrv_qcow2; |
08b392e1 | 987 | QEMUOptionParameter *create_options; |
b6ce07aa | 988 | char backing_filename[PATH_MAX]; |
3b46e624 | 989 | |
c2ad1b0c KW |
990 | if (qdict_size(options) != 0) { |
991 | error_report("Can't use snapshot=on with driver-specific options"); | |
992 | ret = -EINVAL; | |
993 | goto fail; | |
994 | } | |
995 | assert(filename != NULL); | |
996 | ||
ea2384d3 FB |
997 | /* if snapshot, we create a temporary backing file and open it |
998 | instead of opening 'filename' directly */ | |
33e3963e | 999 | |
ea2384d3 FB |
1000 | /* if there is a backing file, use it */ |
1001 | bs1 = bdrv_new(""); | |
de9c0cec | 1002 | ret = bdrv_open(bs1, filename, NULL, 0, drv); |
51d7c00c | 1003 | if (ret < 0) { |
ea2384d3 | 1004 | bdrv_delete(bs1); |
de9c0cec | 1005 | goto fail; |
ea2384d3 | 1006 | } |
3e82990b | 1007 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e | 1008 | |
ea2384d3 | 1009 | bdrv_delete(bs1); |
3b46e624 | 1010 | |
eba25057 JM |
1011 | ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
1012 | if (ret < 0) { | |
de9c0cec | 1013 | goto fail; |
eba25057 | 1014 | } |
7c96d46e AL |
1015 | |
1016 | /* Real path is meaningless for protocols */ | |
4d70655b | 1017 | if (path_has_protocol(filename)) { |
7c96d46e AL |
1018 | snprintf(backing_filename, sizeof(backing_filename), |
1019 | "%s", filename); | |
de9c0cec KW |
1020 | } else if (!realpath(filename, backing_filename)) { |
1021 | ret = -errno; | |
1022 | goto fail; | |
1023 | } | |
7c96d46e | 1024 | |
91a073a9 | 1025 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
08b392e1 KW |
1026 | create_options = parse_option_parameters("", bdrv_qcow2->create_options, |
1027 | NULL); | |
91a073a9 | 1028 | |
08b392e1 KW |
1029 | set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size); |
1030 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FILE, | |
1031 | backing_filename); | |
91a073a9 | 1032 | if (drv) { |
08b392e1 | 1033 | set_option_parameter(create_options, BLOCK_OPT_BACKING_FMT, |
91a073a9 KW |
1034 | drv->format_name); |
1035 | } | |
1036 | ||
08b392e1 KW |
1037 | ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options); |
1038 | free_option_parameters(create_options); | |
51d7c00c | 1039 | if (ret < 0) { |
de9c0cec | 1040 | goto fail; |
ea2384d3 | 1041 | } |
91a073a9 | 1042 | |
ea2384d3 | 1043 | filename = tmp_filename; |
91a073a9 | 1044 | drv = bdrv_qcow2; |
ea2384d3 FB |
1045 | bs->is_temporary = 1; |
1046 | } | |
712e7874 | 1047 | |
f500a6d3 KW |
1048 | /* Open image file without format layer */ |
1049 | if (flags & BDRV_O_RDWR) { | |
1050 | flags |= BDRV_O_ALLOW_RDWR; | |
1051 | } | |
1052 | ||
707ff828 KW |
1053 | extract_subqdict(options, &file_options, "file."); |
1054 | ||
1055 | ret = bdrv_file_open(&file, filename, file_options, | |
50b05b6f | 1056 | bdrv_open_flags(bs, flags | BDRV_O_UNMAP)); |
f500a6d3 | 1057 | if (ret < 0) { |
de9c0cec | 1058 | goto fail; |
f500a6d3 KW |
1059 | } |
1060 | ||
b6ce07aa | 1061 | /* Find the right image format driver */ |
6db95603 | 1062 | if (!drv) { |
f500a6d3 | 1063 | ret = find_image_format(file, filename, &drv); |
51d7c00c | 1064 | } |
6987307c | 1065 | |
51d7c00c | 1066 | if (!drv) { |
51d7c00c | 1067 | goto unlink_and_fail; |
ea2384d3 | 1068 | } |
b6ce07aa KW |
1069 | |
1070 | /* Open the image */ | |
035fccdf | 1071 | ret = bdrv_open_common(bs, file, options, flags, drv); |
b6ce07aa | 1072 | if (ret < 0) { |
6987307c CH |
1073 | goto unlink_and_fail; |
1074 | } | |
1075 | ||
f500a6d3 KW |
1076 | if (bs->file != file) { |
1077 | bdrv_delete(file); | |
1078 | file = NULL; | |
1079 | } | |
1080 | ||
b6ce07aa | 1081 | /* If there is a backing file, use it */ |
9156df12 | 1082 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
31ca6d07 KW |
1083 | QDict *backing_options; |
1084 | ||
1085 | extract_subqdict(options, &backing_options, "backing."); | |
1086 | ret = bdrv_open_backing_file(bs, backing_options); | |
b6ce07aa | 1087 | if (ret < 0) { |
b6ad491a | 1088 | goto close_and_fail; |
b6ce07aa | 1089 | } |
b6ce07aa KW |
1090 | } |
1091 | ||
b6ad491a KW |
1092 | /* Check if any unknown options were used */ |
1093 | if (qdict_size(options) != 0) { | |
1094 | const QDictEntry *entry = qdict_first(options); | |
1095 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Block format '%s' used by " | |
1096 | "device '%s' doesn't support the option '%s'", | |
1097 | drv->format_name, bs->device_name, entry->key); | |
1098 | ||
1099 | ret = -EINVAL; | |
1100 | goto close_and_fail; | |
1101 | } | |
1102 | QDECREF(options); | |
1103 | ||
b6ce07aa | 1104 | if (!bdrv_key_required(bs)) { |
7d4b4ba5 | 1105 | bdrv_dev_change_media_cb(bs, true); |
b6ce07aa KW |
1106 | } |
1107 | ||
98f90dba ZYW |
1108 | /* throttling disk I/O limits */ |
1109 | if (bs->io_limits_enabled) { | |
1110 | bdrv_io_limits_enable(bs); | |
1111 | } | |
1112 | ||
b6ce07aa KW |
1113 | return 0; |
1114 | ||
1115 | unlink_and_fail: | |
f500a6d3 KW |
1116 | if (file != NULL) { |
1117 | bdrv_delete(file); | |
1118 | } | |
b6ce07aa KW |
1119 | if (bs->is_temporary) { |
1120 | unlink(filename); | |
1121 | } | |
de9c0cec KW |
1122 | fail: |
1123 | QDECREF(bs->options); | |
b6ad491a | 1124 | QDECREF(options); |
de9c0cec | 1125 | bs->options = NULL; |
b6ad491a | 1126 | return ret; |
de9c0cec | 1127 | |
b6ad491a KW |
1128 | close_and_fail: |
1129 | bdrv_close(bs); | |
1130 | QDECREF(options); | |
b6ce07aa KW |
1131 | return ret; |
1132 | } | |
1133 | ||
e971aa12 JC |
1134 | typedef struct BlockReopenQueueEntry { |
1135 | bool prepared; | |
1136 | BDRVReopenState state; | |
1137 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; | |
1138 | } BlockReopenQueueEntry; | |
1139 | ||
1140 | /* | |
1141 | * Adds a BlockDriverState to a simple queue for an atomic, transactional | |
1142 | * reopen of multiple devices. | |
1143 | * | |
1144 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT | |
1145 | * already performed, or alternatively may be NULL a new BlockReopenQueue will | |
1146 | * be created and initialized. This newly created BlockReopenQueue should be | |
1147 | * passed back in for subsequent calls that are intended to be of the same | |
1148 | * atomic 'set'. | |
1149 | * | |
1150 | * bs is the BlockDriverState to add to the reopen queue. | |
1151 | * | |
1152 | * flags contains the open flags for the associated bs | |
1153 | * | |
1154 | * returns a pointer to bs_queue, which is either the newly allocated | |
1155 | * bs_queue, or the existing bs_queue being used. | |
1156 | * | |
1157 | */ | |
1158 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, | |
1159 | BlockDriverState *bs, int flags) | |
1160 | { | |
1161 | assert(bs != NULL); | |
1162 | ||
1163 | BlockReopenQueueEntry *bs_entry; | |
1164 | if (bs_queue == NULL) { | |
1165 | bs_queue = g_new0(BlockReopenQueue, 1); | |
1166 | QSIMPLEQ_INIT(bs_queue); | |
1167 | } | |
1168 | ||
1169 | if (bs->file) { | |
1170 | bdrv_reopen_queue(bs_queue, bs->file, flags); | |
1171 | } | |
1172 | ||
1173 | bs_entry = g_new0(BlockReopenQueueEntry, 1); | |
1174 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); | |
1175 | ||
1176 | bs_entry->state.bs = bs; | |
1177 | bs_entry->state.flags = flags; | |
1178 | ||
1179 | return bs_queue; | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * Reopen multiple BlockDriverStates atomically & transactionally. | |
1184 | * | |
1185 | * The queue passed in (bs_queue) must have been built up previous | |
1186 | * via bdrv_reopen_queue(). | |
1187 | * | |
1188 | * Reopens all BDS specified in the queue, with the appropriate | |
1189 | * flags. All devices are prepared for reopen, and failure of any | |
1190 | * device will cause all device changes to be abandonded, and intermediate | |
1191 | * data cleaned up. | |
1192 | * | |
1193 | * If all devices prepare successfully, then the changes are committed | |
1194 | * to all devices. | |
1195 | * | |
1196 | */ | |
1197 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) | |
1198 | { | |
1199 | int ret = -1; | |
1200 | BlockReopenQueueEntry *bs_entry, *next; | |
1201 | Error *local_err = NULL; | |
1202 | ||
1203 | assert(bs_queue != NULL); | |
1204 | ||
1205 | bdrv_drain_all(); | |
1206 | ||
1207 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1208 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { | |
1209 | error_propagate(errp, local_err); | |
1210 | goto cleanup; | |
1211 | } | |
1212 | bs_entry->prepared = true; | |
1213 | } | |
1214 | ||
1215 | /* If we reach this point, we have success and just need to apply the | |
1216 | * changes | |
1217 | */ | |
1218 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { | |
1219 | bdrv_reopen_commit(&bs_entry->state); | |
1220 | } | |
1221 | ||
1222 | ret = 0; | |
1223 | ||
1224 | cleanup: | |
1225 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { | |
1226 | if (ret && bs_entry->prepared) { | |
1227 | bdrv_reopen_abort(&bs_entry->state); | |
1228 | } | |
1229 | g_free(bs_entry); | |
1230 | } | |
1231 | g_free(bs_queue); | |
1232 | return ret; | |
1233 | } | |
1234 | ||
1235 | ||
1236 | /* Reopen a single BlockDriverState with the specified flags. */ | |
1237 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) | |
1238 | { | |
1239 | int ret = -1; | |
1240 | Error *local_err = NULL; | |
1241 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); | |
1242 | ||
1243 | ret = bdrv_reopen_multiple(queue, &local_err); | |
1244 | if (local_err != NULL) { | |
1245 | error_propagate(errp, local_err); | |
1246 | } | |
1247 | return ret; | |
1248 | } | |
1249 | ||
1250 | ||
1251 | /* | |
1252 | * Prepares a BlockDriverState for reopen. All changes are staged in the | |
1253 | * 'opaque' field of the BDRVReopenState, which is used and allocated by | |
1254 | * the block driver layer .bdrv_reopen_prepare() | |
1255 | * | |
1256 | * bs is the BlockDriverState to reopen | |
1257 | * flags are the new open flags | |
1258 | * queue is the reopen queue | |
1259 | * | |
1260 | * Returns 0 on success, non-zero on error. On error errp will be set | |
1261 | * as well. | |
1262 | * | |
1263 | * On failure, bdrv_reopen_abort() will be called to clean up any data. | |
1264 | * It is the responsibility of the caller to then call the abort() or | |
1265 | * commit() for any other BDS that have been left in a prepare() state | |
1266 | * | |
1267 | */ | |
1268 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, | |
1269 | Error **errp) | |
1270 | { | |
1271 | int ret = -1; | |
1272 | Error *local_err = NULL; | |
1273 | BlockDriver *drv; | |
1274 | ||
1275 | assert(reopen_state != NULL); | |
1276 | assert(reopen_state->bs->drv != NULL); | |
1277 | drv = reopen_state->bs->drv; | |
1278 | ||
1279 | /* if we are to stay read-only, do not allow permission change | |
1280 | * to r/w */ | |
1281 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && | |
1282 | reopen_state->flags & BDRV_O_RDWR) { | |
1283 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, | |
1284 | reopen_state->bs->device_name); | |
1285 | goto error; | |
1286 | } | |
1287 | ||
1288 | ||
1289 | ret = bdrv_flush(reopen_state->bs); | |
1290 | if (ret) { | |
1291 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", | |
1292 | strerror(-ret)); | |
1293 | goto error; | |
1294 | } | |
1295 | ||
1296 | if (drv->bdrv_reopen_prepare) { | |
1297 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); | |
1298 | if (ret) { | |
1299 | if (local_err != NULL) { | |
1300 | error_propagate(errp, local_err); | |
1301 | } else { | |
d8b6895f LC |
1302 | error_setg(errp, "failed while preparing to reopen image '%s'", |
1303 | reopen_state->bs->filename); | |
e971aa12 JC |
1304 | } |
1305 | goto error; | |
1306 | } | |
1307 | } else { | |
1308 | /* It is currently mandatory to have a bdrv_reopen_prepare() | |
1309 | * handler for each supported drv. */ | |
1310 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
1311 | drv->format_name, reopen_state->bs->device_name, | |
1312 | "reopening of file"); | |
1313 | ret = -1; | |
1314 | goto error; | |
1315 | } | |
1316 | ||
1317 | ret = 0; | |
1318 | ||
1319 | error: | |
1320 | return ret; | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and | |
1325 | * makes them final by swapping the staging BlockDriverState contents into | |
1326 | * the active BlockDriverState contents. | |
1327 | */ | |
1328 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) | |
1329 | { | |
1330 | BlockDriver *drv; | |
1331 | ||
1332 | assert(reopen_state != NULL); | |
1333 | drv = reopen_state->bs->drv; | |
1334 | assert(drv != NULL); | |
1335 | ||
1336 | /* If there are any driver level actions to take */ | |
1337 | if (drv->bdrv_reopen_commit) { | |
1338 | drv->bdrv_reopen_commit(reopen_state); | |
1339 | } | |
1340 | ||
1341 | /* set BDS specific flags now */ | |
1342 | reopen_state->bs->open_flags = reopen_state->flags; | |
1343 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & | |
1344 | BDRV_O_CACHE_WB); | |
1345 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * Abort the reopen, and delete and free the staged changes in | |
1350 | * reopen_state | |
1351 | */ | |
1352 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) | |
1353 | { | |
1354 | BlockDriver *drv; | |
1355 | ||
1356 | assert(reopen_state != NULL); | |
1357 | drv = reopen_state->bs->drv; | |
1358 | assert(drv != NULL); | |
1359 | ||
1360 | if (drv->bdrv_reopen_abort) { | |
1361 | drv->bdrv_reopen_abort(reopen_state); | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | ||
fc01f7e7 FB |
1366 | void bdrv_close(BlockDriverState *bs) |
1367 | { | |
3cbc002c PB |
1368 | if (bs->job) { |
1369 | block_job_cancel_sync(bs->job); | |
1370 | } | |
58fda173 SH |
1371 | bdrv_drain_all(); /* complete I/O */ |
1372 | bdrv_flush(bs); | |
1373 | bdrv_drain_all(); /* in case flush left pending I/O */ | |
d7d512f6 | 1374 | notifier_list_notify(&bs->close_notifiers, bs); |
7094f12f | 1375 | |
3cbc002c | 1376 | if (bs->drv) { |
557df6ac | 1377 | if (bs->backing_hd) { |
ea2384d3 | 1378 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
1379 | bs->backing_hd = NULL; |
1380 | } | |
ea2384d3 | 1381 | bs->drv->bdrv_close(bs); |
7267c094 | 1382 | g_free(bs->opaque); |
ea2384d3 FB |
1383 | #ifdef _WIN32 |
1384 | if (bs->is_temporary) { | |
1385 | unlink(bs->filename); | |
1386 | } | |
67b915a5 | 1387 | #endif |
ea2384d3 FB |
1388 | bs->opaque = NULL; |
1389 | bs->drv = NULL; | |
53fec9d3 | 1390 | bs->copy_on_read = 0; |
a275fa42 PB |
1391 | bs->backing_file[0] = '\0'; |
1392 | bs->backing_format[0] = '\0'; | |
6405875c PB |
1393 | bs->total_sectors = 0; |
1394 | bs->encrypted = 0; | |
1395 | bs->valid_key = 0; | |
1396 | bs->sg = 0; | |
1397 | bs->growable = 0; | |
de9c0cec KW |
1398 | QDECREF(bs->options); |
1399 | bs->options = NULL; | |
b338082b | 1400 | |
66f82cee | 1401 | if (bs->file != NULL) { |
0ac9377d PB |
1402 | bdrv_delete(bs->file); |
1403 | bs->file = NULL; | |
66f82cee | 1404 | } |
b338082b | 1405 | } |
98f90dba | 1406 | |
9ca11154 PH |
1407 | bdrv_dev_change_media_cb(bs, false); |
1408 | ||
98f90dba ZYW |
1409 | /*throttling disk I/O limits*/ |
1410 | if (bs->io_limits_enabled) { | |
1411 | bdrv_io_limits_disable(bs); | |
1412 | } | |
b338082b FB |
1413 | } |
1414 | ||
2bc93fed MK |
1415 | void bdrv_close_all(void) |
1416 | { | |
1417 | BlockDriverState *bs; | |
1418 | ||
1419 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1420 | bdrv_close(bs); | |
1421 | } | |
1422 | } | |
1423 | ||
922453bc SH |
1424 | /* |
1425 | * Wait for pending requests to complete across all BlockDriverStates | |
1426 | * | |
1427 | * This function does not flush data to disk, use bdrv_flush_all() for that | |
1428 | * after calling this function. | |
4c355d53 ZYW |
1429 | * |
1430 | * Note that completion of an asynchronous I/O operation can trigger any | |
1431 | * number of other I/O operations on other devices---for example a coroutine | |
1432 | * can be arbitrarily complex and a constant flow of I/O can come until the | |
1433 | * coroutine is complete. Because of this, it is not possible to have a | |
1434 | * function to drain a single device's I/O queue. | |
922453bc SH |
1435 | */ |
1436 | void bdrv_drain_all(void) | |
1437 | { | |
1438 | BlockDriverState *bs; | |
4c355d53 ZYW |
1439 | bool busy; |
1440 | ||
1441 | do { | |
1442 | busy = qemu_aio_wait(); | |
922453bc | 1443 | |
4c355d53 ZYW |
1444 | /* FIXME: We do not have timer support here, so this is effectively |
1445 | * a busy wait. | |
1446 | */ | |
1447 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1448 | if (!qemu_co_queue_empty(&bs->throttled_reqs)) { | |
1449 | qemu_co_queue_restart_all(&bs->throttled_reqs); | |
1450 | busy = true; | |
1451 | } | |
1452 | } | |
1453 | } while (busy); | |
922453bc SH |
1454 | |
1455 | /* If requests are still pending there is a bug somewhere */ | |
1456 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1457 | assert(QLIST_EMPTY(&bs->tracked_requests)); | |
1458 | assert(qemu_co_queue_empty(&bs->throttled_reqs)); | |
1459 | } | |
1460 | } | |
1461 | ||
d22b2f41 RH |
1462 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
1463 | Also, NULL terminate the device_name to prevent double remove */ | |
1464 | void bdrv_make_anon(BlockDriverState *bs) | |
1465 | { | |
1466 | if (bs->device_name[0] != '\0') { | |
1467 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
1468 | } | |
1469 | bs->device_name[0] = '\0'; | |
1470 | } | |
1471 | ||
e023b2e2 PB |
1472 | static void bdrv_rebind(BlockDriverState *bs) |
1473 | { | |
1474 | if (bs->drv && bs->drv->bdrv_rebind) { | |
1475 | bs->drv->bdrv_rebind(bs); | |
1476 | } | |
1477 | } | |
1478 | ||
4ddc07ca PB |
1479 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
1480 | BlockDriverState *bs_src) | |
8802d1fd | 1481 | { |
4ddc07ca PB |
1482 | /* move some fields that need to stay attached to the device */ |
1483 | bs_dest->open_flags = bs_src->open_flags; | |
8802d1fd JC |
1484 | |
1485 | /* dev info */ | |
4ddc07ca PB |
1486 | bs_dest->dev_ops = bs_src->dev_ops; |
1487 | bs_dest->dev_opaque = bs_src->dev_opaque; | |
1488 | bs_dest->dev = bs_src->dev; | |
1489 | bs_dest->buffer_alignment = bs_src->buffer_alignment; | |
1490 | bs_dest->copy_on_read = bs_src->copy_on_read; | |
8802d1fd | 1491 | |
4ddc07ca | 1492 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
c4a248a1 | 1493 | |
8802d1fd | 1494 | /* i/o timing parameters */ |
4ddc07ca PB |
1495 | bs_dest->slice_start = bs_src->slice_start; |
1496 | bs_dest->slice_end = bs_src->slice_end; | |
5905fbc9 | 1497 | bs_dest->slice_submitted = bs_src->slice_submitted; |
4ddc07ca | 1498 | bs_dest->io_limits = bs_src->io_limits; |
4ddc07ca PB |
1499 | bs_dest->throttled_reqs = bs_src->throttled_reqs; |
1500 | bs_dest->block_timer = bs_src->block_timer; | |
1501 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; | |
8802d1fd | 1502 | |
8802d1fd | 1503 | /* r/w error */ |
4ddc07ca PB |
1504 | bs_dest->on_read_error = bs_src->on_read_error; |
1505 | bs_dest->on_write_error = bs_src->on_write_error; | |
8802d1fd JC |
1506 | |
1507 | /* i/o status */ | |
4ddc07ca PB |
1508 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
1509 | bs_dest->iostatus = bs_src->iostatus; | |
8802d1fd | 1510 | |
a9fc4408 | 1511 | /* dirty bitmap */ |
4ddc07ca | 1512 | bs_dest->dirty_bitmap = bs_src->dirty_bitmap; |
a9fc4408 PB |
1513 | |
1514 | /* job */ | |
4ddc07ca PB |
1515 | bs_dest->in_use = bs_src->in_use; |
1516 | bs_dest->job = bs_src->job; | |
a9fc4408 | 1517 | |
8802d1fd | 1518 | /* keep the same entry in bdrv_states */ |
4ddc07ca PB |
1519 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
1520 | bs_src->device_name); | |
1521 | bs_dest->list = bs_src->list; | |
1522 | } | |
8802d1fd | 1523 | |
4ddc07ca PB |
1524 | /* |
1525 | * Swap bs contents for two image chains while they are live, | |
1526 | * while keeping required fields on the BlockDriverState that is | |
1527 | * actually attached to a device. | |
1528 | * | |
1529 | * This will modify the BlockDriverState fields, and swap contents | |
1530 | * between bs_new and bs_old. Both bs_new and bs_old are modified. | |
1531 | * | |
1532 | * bs_new is required to be anonymous. | |
1533 | * | |
1534 | * This function does not create any image files. | |
1535 | */ | |
1536 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) | |
1537 | { | |
1538 | BlockDriverState tmp; | |
f6801b83 | 1539 | |
4ddc07ca PB |
1540 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
1541 | assert(bs_new->device_name[0] == '\0'); | |
1542 | assert(bs_new->dirty_bitmap == NULL); | |
1543 | assert(bs_new->job == NULL); | |
1544 | assert(bs_new->dev == NULL); | |
1545 | assert(bs_new->in_use == 0); | |
1546 | assert(bs_new->io_limits_enabled == false); | |
1547 | assert(bs_new->block_timer == NULL); | |
8802d1fd | 1548 | |
4ddc07ca PB |
1549 | tmp = *bs_new; |
1550 | *bs_new = *bs_old; | |
1551 | *bs_old = tmp; | |
a9fc4408 | 1552 | |
4ddc07ca PB |
1553 | /* there are some fields that should not be swapped, move them back */ |
1554 | bdrv_move_feature_fields(&tmp, bs_old); | |
1555 | bdrv_move_feature_fields(bs_old, bs_new); | |
1556 | bdrv_move_feature_fields(bs_new, &tmp); | |
8802d1fd | 1557 | |
4ddc07ca PB |
1558 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
1559 | assert(bs_new->device_name[0] == '\0'); | |
1560 | ||
1561 | /* Check a few fields that should remain attached to the device */ | |
1562 | assert(bs_new->dev == NULL); | |
1563 | assert(bs_new->job == NULL); | |
1564 | assert(bs_new->in_use == 0); | |
1565 | assert(bs_new->io_limits_enabled == false); | |
1566 | assert(bs_new->block_timer == NULL); | |
e023b2e2 PB |
1567 | |
1568 | bdrv_rebind(bs_new); | |
4ddc07ca PB |
1569 | bdrv_rebind(bs_old); |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Add new bs contents at the top of an image chain while the chain is | |
1574 | * live, while keeping required fields on the top layer. | |
1575 | * | |
1576 | * This will modify the BlockDriverState fields, and swap contents | |
1577 | * between bs_new and bs_top. Both bs_new and bs_top are modified. | |
1578 | * | |
1579 | * bs_new is required to be anonymous. | |
1580 | * | |
1581 | * This function does not create any image files. | |
1582 | */ | |
1583 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) | |
1584 | { | |
1585 | bdrv_swap(bs_new, bs_top); | |
1586 | ||
1587 | /* The contents of 'tmp' will become bs_top, as we are | |
1588 | * swapping bs_new and bs_top contents. */ | |
1589 | bs_top->backing_hd = bs_new; | |
1590 | bs_top->open_flags &= ~BDRV_O_NO_BACKING; | |
1591 | pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file), | |
1592 | bs_new->filename); | |
1593 | pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format), | |
1594 | bs_new->drv ? bs_new->drv->format_name : ""); | |
8802d1fd JC |
1595 | } |
1596 | ||
b338082b FB |
1597 | void bdrv_delete(BlockDriverState *bs) |
1598 | { | |
fa879d62 | 1599 | assert(!bs->dev); |
3e914655 PB |
1600 | assert(!bs->job); |
1601 | assert(!bs->in_use); | |
18846dee | 1602 | |
1b7bdbc1 | 1603 | /* remove from list, if necessary */ |
d22b2f41 | 1604 | bdrv_make_anon(bs); |
34c6f050 | 1605 | |
b338082b | 1606 | bdrv_close(bs); |
66f82cee | 1607 | |
7267c094 | 1608 | g_free(bs); |
fc01f7e7 FB |
1609 | } |
1610 | ||
fa879d62 MA |
1611 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
1612 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
18846dee | 1613 | { |
fa879d62 | 1614 | if (bs->dev) { |
18846dee MA |
1615 | return -EBUSY; |
1616 | } | |
fa879d62 | 1617 | bs->dev = dev; |
28a7282a | 1618 | bdrv_iostatus_reset(bs); |
18846dee MA |
1619 | return 0; |
1620 | } | |
1621 | ||
fa879d62 MA |
1622 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
1623 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
18846dee | 1624 | { |
fa879d62 MA |
1625 | if (bdrv_attach_dev(bs, dev) < 0) { |
1626 | abort(); | |
1627 | } | |
1628 | } | |
1629 | ||
1630 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
1631 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
1632 | { | |
1633 | assert(bs->dev == dev); | |
1634 | bs->dev = NULL; | |
0e49de52 MA |
1635 | bs->dev_ops = NULL; |
1636 | bs->dev_opaque = NULL; | |
29e05f20 | 1637 | bs->buffer_alignment = 512; |
18846dee MA |
1638 | } |
1639 | ||
fa879d62 MA |
1640 | /* TODO change to return DeviceState * when all users are qdevified */ |
1641 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
18846dee | 1642 | { |
fa879d62 | 1643 | return bs->dev; |
18846dee MA |
1644 | } |
1645 | ||
0e49de52 MA |
1646 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1647 | void *opaque) | |
1648 | { | |
1649 | bs->dev_ops = ops; | |
1650 | bs->dev_opaque = opaque; | |
1651 | } | |
1652 | ||
32c81a4a PB |
1653 | void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1654 | enum MonitorEvent ev, | |
1655 | BlockErrorAction action, bool is_read) | |
329c0a48 LC |
1656 | { |
1657 | QObject *data; | |
1658 | const char *action_str; | |
1659 | ||
1660 | switch (action) { | |
1661 | case BDRV_ACTION_REPORT: | |
1662 | action_str = "report"; | |
1663 | break; | |
1664 | case BDRV_ACTION_IGNORE: | |
1665 | action_str = "ignore"; | |
1666 | break; | |
1667 | case BDRV_ACTION_STOP: | |
1668 | action_str = "stop"; | |
1669 | break; | |
1670 | default: | |
1671 | abort(); | |
1672 | } | |
1673 | ||
1674 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1675 | bdrv->device_name, | |
1676 | action_str, | |
1677 | is_read ? "read" : "write"); | |
32c81a4a | 1678 | monitor_protocol_event(ev, data); |
329c0a48 LC |
1679 | |
1680 | qobject_decref(data); | |
1681 | } | |
1682 | ||
6f382ed2 LC |
1683 | static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1684 | { | |
1685 | QObject *data; | |
1686 | ||
1687 | data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }", | |
1688 | bdrv_get_device_name(bs), ejected); | |
1689 | monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); | |
1690 | ||
1691 | qobject_decref(data); | |
1692 | } | |
1693 | ||
7d4b4ba5 | 1694 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
0e49de52 | 1695 | { |
145feb17 | 1696 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
6f382ed2 | 1697 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
7d4b4ba5 | 1698 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
6f382ed2 LC |
1699 | if (tray_was_closed) { |
1700 | /* tray open */ | |
1701 | bdrv_emit_qmp_eject_event(bs, true); | |
1702 | } | |
1703 | if (load) { | |
1704 | /* tray close */ | |
1705 | bdrv_emit_qmp_eject_event(bs, false); | |
1706 | } | |
145feb17 MA |
1707 | } |
1708 | } | |
1709 | ||
2c6942fa MA |
1710 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
1711 | { | |
1712 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); | |
1713 | } | |
1714 | ||
025ccaa7 PB |
1715 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1716 | { | |
1717 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { | |
1718 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); | |
1719 | } | |
1720 | } | |
1721 | ||
e4def80b MA |
1722 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
1723 | { | |
1724 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { | |
1725 | return bs->dev_ops->is_tray_open(bs->dev_opaque); | |
1726 | } | |
1727 | return false; | |
1728 | } | |
1729 | ||
145feb17 MA |
1730 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1731 | { | |
1732 | if (bs->dev_ops && bs->dev_ops->resize_cb) { | |
1733 | bs->dev_ops->resize_cb(bs->dev_opaque); | |
0e49de52 MA |
1734 | } |
1735 | } | |
1736 | ||
f107639a MA |
1737 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
1738 | { | |
1739 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { | |
1740 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); | |
1741 | } | |
1742 | return false; | |
1743 | } | |
1744 | ||
e97fc193 AL |
1745 | /* |
1746 | * Run consistency checks on an image | |
1747 | * | |
e076f338 | 1748 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 1749 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 1750 | * check are stored in res. |
e97fc193 | 1751 | */ |
4534ff54 | 1752 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
e97fc193 AL |
1753 | { |
1754 | if (bs->drv->bdrv_check == NULL) { | |
1755 | return -ENOTSUP; | |
1756 | } | |
1757 | ||
e076f338 | 1758 | memset(res, 0, sizeof(*res)); |
4534ff54 | 1759 | return bs->drv->bdrv_check(bs, res, fix); |
e97fc193 AL |
1760 | } |
1761 | ||
8a426614 KW |
1762 | #define COMMIT_BUF_SECTORS 2048 |
1763 | ||
33e3963e FB |
1764 | /* commit COW file into the raw image */ |
1765 | int bdrv_commit(BlockDriverState *bs) | |
1766 | { | |
19cb3738 | 1767 | BlockDriver *drv = bs->drv; |
8a426614 KW |
1768 | int64_t sector, total_sectors; |
1769 | int n, ro, open_flags; | |
0bce597d | 1770 | int ret = 0; |
8a426614 | 1771 | uint8_t *buf; |
c2cba3d9 | 1772 | char filename[PATH_MAX]; |
33e3963e | 1773 | |
19cb3738 FB |
1774 | if (!drv) |
1775 | return -ENOMEDIUM; | |
4dca4b63 NS |
1776 | |
1777 | if (!bs->backing_hd) { | |
1778 | return -ENOTSUP; | |
33e3963e FB |
1779 | } |
1780 | ||
2d3735d3 SH |
1781 | if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) { |
1782 | return -EBUSY; | |
1783 | } | |
1784 | ||
4dca4b63 | 1785 | ro = bs->backing_hd->read_only; |
c2cba3d9 JM |
1786 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
1787 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); | |
4dca4b63 NS |
1788 | open_flags = bs->backing_hd->open_flags; |
1789 | ||
1790 | if (ro) { | |
0bce597d JC |
1791 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
1792 | return -EACCES; | |
4dca4b63 | 1793 | } |
ea2384d3 | 1794 | } |
33e3963e | 1795 | |
6ea44308 | 1796 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
7267c094 | 1797 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
8a426614 KW |
1798 | |
1799 | for (sector = 0; sector < total_sectors; sector += n) { | |
05c4af54 | 1800 | if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { |
8a426614 KW |
1801 | |
1802 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
1803 | ret = -EIO; | |
1804 | goto ro_cleanup; | |
1805 | } | |
1806 | ||
1807 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
1808 | ret = -EIO; | |
1809 | goto ro_cleanup; | |
1810 | } | |
ea2384d3 | 1811 | } |
33e3963e | 1812 | } |
95389c86 | 1813 | |
1d44952f CH |
1814 | if (drv->bdrv_make_empty) { |
1815 | ret = drv->bdrv_make_empty(bs); | |
1816 | bdrv_flush(bs); | |
1817 | } | |
95389c86 | 1818 | |
3f5075ae CH |
1819 | /* |
1820 | * Make sure all data we wrote to the backing device is actually | |
1821 | * stable on disk. | |
1822 | */ | |
1823 | if (bs->backing_hd) | |
1824 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
1825 | |
1826 | ro_cleanup: | |
7267c094 | 1827 | g_free(buf); |
4dca4b63 NS |
1828 | |
1829 | if (ro) { | |
0bce597d JC |
1830 | /* ignoring error return here */ |
1831 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); | |
4dca4b63 NS |
1832 | } |
1833 | ||
1d44952f | 1834 | return ret; |
33e3963e FB |
1835 | } |
1836 | ||
e8877497 | 1837 | int bdrv_commit_all(void) |
6ab4b5ab MA |
1838 | { |
1839 | BlockDriverState *bs; | |
1840 | ||
1841 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
272d2d8e JC |
1842 | if (bs->drv && bs->backing_hd) { |
1843 | int ret = bdrv_commit(bs); | |
1844 | if (ret < 0) { | |
1845 | return ret; | |
1846 | } | |
e8877497 | 1847 | } |
6ab4b5ab | 1848 | } |
e8877497 | 1849 | return 0; |
6ab4b5ab MA |
1850 | } |
1851 | ||
dbffbdcf SH |
1852 | /** |
1853 | * Remove an active request from the tracked requests list | |
1854 | * | |
1855 | * This function should be called when a tracked request is completing. | |
1856 | */ | |
1857 | static void tracked_request_end(BdrvTrackedRequest *req) | |
1858 | { | |
1859 | QLIST_REMOVE(req, list); | |
f4658285 | 1860 | qemu_co_queue_restart_all(&req->wait_queue); |
dbffbdcf SH |
1861 | } |
1862 | ||
1863 | /** | |
1864 | * Add an active request to the tracked requests list | |
1865 | */ | |
1866 | static void tracked_request_begin(BdrvTrackedRequest *req, | |
1867 | BlockDriverState *bs, | |
1868 | int64_t sector_num, | |
1869 | int nb_sectors, bool is_write) | |
1870 | { | |
1871 | *req = (BdrvTrackedRequest){ | |
1872 | .bs = bs, | |
1873 | .sector_num = sector_num, | |
1874 | .nb_sectors = nb_sectors, | |
1875 | .is_write = is_write, | |
5f8b6491 | 1876 | .co = qemu_coroutine_self(), |
dbffbdcf SH |
1877 | }; |
1878 | ||
f4658285 SH |
1879 | qemu_co_queue_init(&req->wait_queue); |
1880 | ||
dbffbdcf SH |
1881 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1882 | } | |
1883 | ||
d83947ac SH |
1884 | /** |
1885 | * Round a region to cluster boundaries | |
1886 | */ | |
343bded4 PB |
1887 | void bdrv_round_to_clusters(BlockDriverState *bs, |
1888 | int64_t sector_num, int nb_sectors, | |
1889 | int64_t *cluster_sector_num, | |
1890 | int *cluster_nb_sectors) | |
d83947ac SH |
1891 | { |
1892 | BlockDriverInfo bdi; | |
1893 | ||
1894 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { | |
1895 | *cluster_sector_num = sector_num; | |
1896 | *cluster_nb_sectors = nb_sectors; | |
1897 | } else { | |
1898 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; | |
1899 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); | |
1900 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + | |
1901 | nb_sectors, c); | |
1902 | } | |
1903 | } | |
1904 | ||
f4658285 SH |
1905 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1906 | int64_t sector_num, int nb_sectors) { | |
d83947ac SH |
1907 | /* aaaa bbbb */ |
1908 | if (sector_num >= req->sector_num + req->nb_sectors) { | |
1909 | return false; | |
1910 | } | |
1911 | /* bbbb aaaa */ | |
1912 | if (req->sector_num >= sector_num + nb_sectors) { | |
1913 | return false; | |
1914 | } | |
1915 | return true; | |
f4658285 SH |
1916 | } |
1917 | ||
1918 | static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, | |
1919 | int64_t sector_num, int nb_sectors) | |
1920 | { | |
1921 | BdrvTrackedRequest *req; | |
d83947ac SH |
1922 | int64_t cluster_sector_num; |
1923 | int cluster_nb_sectors; | |
f4658285 SH |
1924 | bool retry; |
1925 | ||
d83947ac SH |
1926 | /* If we touch the same cluster it counts as an overlap. This guarantees |
1927 | * that allocating writes will be serialized and not race with each other | |
1928 | * for the same cluster. For example, in copy-on-read it ensures that the | |
1929 | * CoR read and write operations are atomic and guest writes cannot | |
1930 | * interleave between them. | |
1931 | */ | |
343bded4 PB |
1932 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
1933 | &cluster_sector_num, &cluster_nb_sectors); | |
d83947ac | 1934 | |
f4658285 SH |
1935 | do { |
1936 | retry = false; | |
1937 | QLIST_FOREACH(req, &bs->tracked_requests, list) { | |
d83947ac SH |
1938 | if (tracked_request_overlaps(req, cluster_sector_num, |
1939 | cluster_nb_sectors)) { | |
5f8b6491 SH |
1940 | /* Hitting this means there was a reentrant request, for |
1941 | * example, a block driver issuing nested requests. This must | |
1942 | * never happen since it means deadlock. | |
1943 | */ | |
1944 | assert(qemu_coroutine_self() != req->co); | |
1945 | ||
f4658285 SH |
1946 | qemu_co_queue_wait(&req->wait_queue); |
1947 | retry = true; | |
1948 | break; | |
1949 | } | |
1950 | } | |
1951 | } while (retry); | |
1952 | } | |
1953 | ||
756e6736 KW |
1954 | /* |
1955 | * Return values: | |
1956 | * 0 - success | |
1957 | * -EINVAL - backing format specified, but no file | |
1958 | * -ENOSPC - can't update the backing file because no space is left in the | |
1959 | * image file header | |
1960 | * -ENOTSUP - format driver doesn't support changing the backing file | |
1961 | */ | |
1962 | int bdrv_change_backing_file(BlockDriverState *bs, | |
1963 | const char *backing_file, const char *backing_fmt) | |
1964 | { | |
1965 | BlockDriver *drv = bs->drv; | |
469ef350 | 1966 | int ret; |
756e6736 | 1967 | |
5f377794 PB |
1968 | /* Backing file format doesn't make sense without a backing file */ |
1969 | if (backing_fmt && !backing_file) { | |
1970 | return -EINVAL; | |
1971 | } | |
1972 | ||
756e6736 | 1973 | if (drv->bdrv_change_backing_file != NULL) { |
469ef350 | 1974 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
756e6736 | 1975 | } else { |
469ef350 | 1976 | ret = -ENOTSUP; |
756e6736 | 1977 | } |
469ef350 PB |
1978 | |
1979 | if (ret == 0) { | |
1980 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); | |
1981 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1982 | } | |
1983 | return ret; | |
756e6736 KW |
1984 | } |
1985 | ||
6ebdcee2 JC |
1986 | /* |
1987 | * Finds the image layer in the chain that has 'bs' as its backing file. | |
1988 | * | |
1989 | * active is the current topmost image. | |
1990 | * | |
1991 | * Returns NULL if bs is not found in active's image chain, | |
1992 | * or if active == bs. | |
1993 | */ | |
1994 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, | |
1995 | BlockDriverState *bs) | |
1996 | { | |
1997 | BlockDriverState *overlay = NULL; | |
1998 | BlockDriverState *intermediate; | |
1999 | ||
2000 | assert(active != NULL); | |
2001 | assert(bs != NULL); | |
2002 | ||
2003 | /* if bs is the same as active, then by definition it has no overlay | |
2004 | */ | |
2005 | if (active == bs) { | |
2006 | return NULL; | |
2007 | } | |
2008 | ||
2009 | intermediate = active; | |
2010 | while (intermediate->backing_hd) { | |
2011 | if (intermediate->backing_hd == bs) { | |
2012 | overlay = intermediate; | |
2013 | break; | |
2014 | } | |
2015 | intermediate = intermediate->backing_hd; | |
2016 | } | |
2017 | ||
2018 | return overlay; | |
2019 | } | |
2020 | ||
2021 | typedef struct BlkIntermediateStates { | |
2022 | BlockDriverState *bs; | |
2023 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; | |
2024 | } BlkIntermediateStates; | |
2025 | ||
2026 | ||
2027 | /* | |
2028 | * Drops images above 'base' up to and including 'top', and sets the image | |
2029 | * above 'top' to have base as its backing file. | |
2030 | * | |
2031 | * Requires that the overlay to 'top' is opened r/w, so that the backing file | |
2032 | * information in 'bs' can be properly updated. | |
2033 | * | |
2034 | * E.g., this will convert the following chain: | |
2035 | * bottom <- base <- intermediate <- top <- active | |
2036 | * | |
2037 | * to | |
2038 | * | |
2039 | * bottom <- base <- active | |
2040 | * | |
2041 | * It is allowed for bottom==base, in which case it converts: | |
2042 | * | |
2043 | * base <- intermediate <- top <- active | |
2044 | * | |
2045 | * to | |
2046 | * | |
2047 | * base <- active | |
2048 | * | |
2049 | * Error conditions: | |
2050 | * if active == top, that is considered an error | |
2051 | * | |
2052 | */ | |
2053 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, | |
2054 | BlockDriverState *base) | |
2055 | { | |
2056 | BlockDriverState *intermediate; | |
2057 | BlockDriverState *base_bs = NULL; | |
2058 | BlockDriverState *new_top_bs = NULL; | |
2059 | BlkIntermediateStates *intermediate_state, *next; | |
2060 | int ret = -EIO; | |
2061 | ||
2062 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; | |
2063 | QSIMPLEQ_INIT(&states_to_delete); | |
2064 | ||
2065 | if (!top->drv || !base->drv) { | |
2066 | goto exit; | |
2067 | } | |
2068 | ||
2069 | new_top_bs = bdrv_find_overlay(active, top); | |
2070 | ||
2071 | if (new_top_bs == NULL) { | |
2072 | /* we could not find the image above 'top', this is an error */ | |
2073 | goto exit; | |
2074 | } | |
2075 | ||
2076 | /* special case of new_top_bs->backing_hd already pointing to base - nothing | |
2077 | * to do, no intermediate images */ | |
2078 | if (new_top_bs->backing_hd == base) { | |
2079 | ret = 0; | |
2080 | goto exit; | |
2081 | } | |
2082 | ||
2083 | intermediate = top; | |
2084 | ||
2085 | /* now we will go down through the list, and add each BDS we find | |
2086 | * into our deletion queue, until we hit the 'base' | |
2087 | */ | |
2088 | while (intermediate) { | |
2089 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); | |
2090 | intermediate_state->bs = intermediate; | |
2091 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); | |
2092 | ||
2093 | if (intermediate->backing_hd == base) { | |
2094 | base_bs = intermediate->backing_hd; | |
2095 | break; | |
2096 | } | |
2097 | intermediate = intermediate->backing_hd; | |
2098 | } | |
2099 | if (base_bs == NULL) { | |
2100 | /* something went wrong, we did not end at the base. safely | |
2101 | * unravel everything, and exit with error */ | |
2102 | goto exit; | |
2103 | } | |
2104 | ||
2105 | /* success - we can delete the intermediate states, and link top->base */ | |
2106 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, | |
2107 | base_bs->drv ? base_bs->drv->format_name : ""); | |
2108 | if (ret) { | |
2109 | goto exit; | |
2110 | } | |
2111 | new_top_bs->backing_hd = base_bs; | |
2112 | ||
2113 | ||
2114 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2115 | /* so that bdrv_close() does not recursively close the chain */ | |
2116 | intermediate_state->bs->backing_hd = NULL; | |
2117 | bdrv_delete(intermediate_state->bs); | |
2118 | } | |
2119 | ret = 0; | |
2120 | ||
2121 | exit: | |
2122 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { | |
2123 | g_free(intermediate_state); | |
2124 | } | |
2125 | return ret; | |
2126 | } | |
2127 | ||
2128 | ||
71d0770c AL |
2129 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
2130 | size_t size) | |
2131 | { | |
2132 | int64_t len; | |
2133 | ||
2134 | if (!bdrv_is_inserted(bs)) | |
2135 | return -ENOMEDIUM; | |
2136 | ||
2137 | if (bs->growable) | |
2138 | return 0; | |
2139 | ||
2140 | len = bdrv_getlength(bs); | |
2141 | ||
fbb7b4e0 KW |
2142 | if (offset < 0) |
2143 | return -EIO; | |
2144 | ||
2145 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
2146 | return -EIO; |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
2152 | int nb_sectors) | |
2153 | { | |
eb5a3165 JS |
2154 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
2155 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
2156 | } |
2157 | ||
1c9805a3 SH |
2158 | typedef struct RwCo { |
2159 | BlockDriverState *bs; | |
2160 | int64_t sector_num; | |
2161 | int nb_sectors; | |
2162 | QEMUIOVector *qiov; | |
2163 | bool is_write; | |
2164 | int ret; | |
2165 | } RwCo; | |
2166 | ||
2167 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) | |
fc01f7e7 | 2168 | { |
1c9805a3 | 2169 | RwCo *rwco = opaque; |
ea2384d3 | 2170 | |
1c9805a3 SH |
2171 | if (!rwco->is_write) { |
2172 | rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, | |
470c0504 | 2173 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
2174 | } else { |
2175 | rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, | |
f08f2dda | 2176 | rwco->nb_sectors, rwco->qiov, 0); |
1c9805a3 SH |
2177 | } |
2178 | } | |
e7a8a783 | 2179 | |
1c9805a3 | 2180 | /* |
8d3b1a2d | 2181 | * Process a vectored synchronous request using coroutines |
1c9805a3 | 2182 | */ |
8d3b1a2d KW |
2183 | static int bdrv_rwv_co(BlockDriverState *bs, int64_t sector_num, |
2184 | QEMUIOVector *qiov, bool is_write) | |
1c9805a3 | 2185 | { |
1c9805a3 SH |
2186 | Coroutine *co; |
2187 | RwCo rwco = { | |
2188 | .bs = bs, | |
2189 | .sector_num = sector_num, | |
8d3b1a2d KW |
2190 | .nb_sectors = qiov->size >> BDRV_SECTOR_BITS, |
2191 | .qiov = qiov, | |
1c9805a3 SH |
2192 | .is_write = is_write, |
2193 | .ret = NOT_DONE, | |
2194 | }; | |
8d3b1a2d | 2195 | assert((qiov->size & (BDRV_SECTOR_SIZE - 1)) == 0); |
e7a8a783 | 2196 | |
498e386c ZYW |
2197 | /** |
2198 | * In sync call context, when the vcpu is blocked, this throttling timer | |
2199 | * will not fire; so the I/O throttling function has to be disabled here | |
2200 | * if it has been enabled. | |
2201 | */ | |
2202 | if (bs->io_limits_enabled) { | |
2203 | fprintf(stderr, "Disabling I/O throttling on '%s' due " | |
2204 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); | |
2205 | bdrv_io_limits_disable(bs); | |
2206 | } | |
2207 | ||
1c9805a3 SH |
2208 | if (qemu_in_coroutine()) { |
2209 | /* Fast-path if already in coroutine context */ | |
2210 | bdrv_rw_co_entry(&rwco); | |
2211 | } else { | |
2212 | co = qemu_coroutine_create(bdrv_rw_co_entry); | |
2213 | qemu_coroutine_enter(co, &rwco); | |
2214 | while (rwco.ret == NOT_DONE) { | |
2215 | qemu_aio_wait(); | |
2216 | } | |
2217 | } | |
2218 | return rwco.ret; | |
2219 | } | |
b338082b | 2220 | |
8d3b1a2d KW |
2221 | /* |
2222 | * Process a synchronous request using coroutines | |
2223 | */ | |
2224 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, | |
2225 | int nb_sectors, bool is_write) | |
2226 | { | |
2227 | QEMUIOVector qiov; | |
2228 | struct iovec iov = { | |
2229 | .iov_base = (void *)buf, | |
2230 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
2231 | }; | |
2232 | ||
2233 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2234 | return bdrv_rwv_co(bs, sector_num, &qiov, is_write); | |
2235 | } | |
2236 | ||
1c9805a3 SH |
2237 | /* return < 0 if error. See bdrv_write() for the return codes */ |
2238 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
2239 | uint8_t *buf, int nb_sectors) | |
2240 | { | |
2241 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); | |
fc01f7e7 FB |
2242 | } |
2243 | ||
07d27a44 MA |
2244 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
2245 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, | |
2246 | uint8_t *buf, int nb_sectors) | |
2247 | { | |
2248 | bool enabled; | |
2249 | int ret; | |
2250 | ||
2251 | enabled = bs->io_limits_enabled; | |
2252 | bs->io_limits_enabled = false; | |
2253 | ret = bdrv_read(bs, 0, buf, 1); | |
2254 | bs->io_limits_enabled = enabled; | |
2255 | return ret; | |
2256 | } | |
2257 | ||
5fafdf24 | 2258 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
2259 | -EIO generic I/O error (may happen for all errors) |
2260 | -ENOMEDIUM No media inserted. | |
2261 | -EINVAL Invalid sector number or nb_sectors | |
2262 | -EACCES Trying to write a read-only device | |
2263 | */ | |
5fafdf24 | 2264 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
2265 | const uint8_t *buf, int nb_sectors) |
2266 | { | |
1c9805a3 | 2267 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
83f64091 FB |
2268 | } |
2269 | ||
8d3b1a2d KW |
2270 | int bdrv_writev(BlockDriverState *bs, int64_t sector_num, QEMUIOVector *qiov) |
2271 | { | |
2272 | return bdrv_rwv_co(bs, sector_num, qiov, true); | |
2273 | } | |
2274 | ||
eda578e5 AL |
2275 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
2276 | void *buf, int count1) | |
83f64091 | 2277 | { |
6ea44308 | 2278 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2279 | int len, nb_sectors, count; |
2280 | int64_t sector_num; | |
9a8c4cce | 2281 | int ret; |
83f64091 FB |
2282 | |
2283 | count = count1; | |
2284 | /* first read to align to sector start */ | |
6ea44308 | 2285 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2286 | if (len > count) |
2287 | len = count; | |
6ea44308 | 2288 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2289 | if (len > 0) { |
9a8c4cce KW |
2290 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2291 | return ret; | |
6ea44308 | 2292 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
2293 | count -= len; |
2294 | if (count == 0) | |
2295 | return count1; | |
2296 | sector_num++; | |
2297 | buf += len; | |
2298 | } | |
2299 | ||
2300 | /* read the sectors "in place" */ | |
6ea44308 | 2301 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2302 | if (nb_sectors > 0) { |
9a8c4cce KW |
2303 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
2304 | return ret; | |
83f64091 | 2305 | sector_num += nb_sectors; |
6ea44308 | 2306 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2307 | buf += len; |
2308 | count -= len; | |
2309 | } | |
2310 | ||
2311 | /* add data from the last sector */ | |
2312 | if (count > 0) { | |
9a8c4cce KW |
2313 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2314 | return ret; | |
83f64091 FB |
2315 | memcpy(buf, tmp_buf, count); |
2316 | } | |
2317 | return count1; | |
2318 | } | |
2319 | ||
8d3b1a2d | 2320 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
83f64091 | 2321 | { |
6ea44308 | 2322 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
2323 | int len, nb_sectors, count; |
2324 | int64_t sector_num; | |
9a8c4cce | 2325 | int ret; |
83f64091 | 2326 | |
8d3b1a2d KW |
2327 | count = qiov->size; |
2328 | ||
83f64091 | 2329 | /* first write to align to sector start */ |
6ea44308 | 2330 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
2331 | if (len > count) |
2332 | len = count; | |
6ea44308 | 2333 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 2334 | if (len > 0) { |
9a8c4cce KW |
2335 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2336 | return ret; | |
8d3b1a2d KW |
2337 | qemu_iovec_to_buf(qiov, 0, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), |
2338 | len); | |
9a8c4cce KW |
2339 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2340 | return ret; | |
83f64091 FB |
2341 | count -= len; |
2342 | if (count == 0) | |
8d3b1a2d | 2343 | return qiov->size; |
83f64091 | 2344 | sector_num++; |
83f64091 FB |
2345 | } |
2346 | ||
2347 | /* write the sectors "in place" */ | |
6ea44308 | 2348 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 2349 | if (nb_sectors > 0) { |
8d3b1a2d KW |
2350 | QEMUIOVector qiov_inplace; |
2351 | ||
2352 | qemu_iovec_init(&qiov_inplace, qiov->niov); | |
2353 | qemu_iovec_concat(&qiov_inplace, qiov, len, | |
2354 | nb_sectors << BDRV_SECTOR_BITS); | |
2355 | ret = bdrv_writev(bs, sector_num, &qiov_inplace); | |
2356 | qemu_iovec_destroy(&qiov_inplace); | |
2357 | if (ret < 0) { | |
9a8c4cce | 2358 | return ret; |
8d3b1a2d KW |
2359 | } |
2360 | ||
83f64091 | 2361 | sector_num += nb_sectors; |
6ea44308 | 2362 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
2363 | count -= len; |
2364 | } | |
2365 | ||
2366 | /* add data from the last sector */ | |
2367 | if (count > 0) { | |
9a8c4cce KW |
2368 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
2369 | return ret; | |
8d3b1a2d | 2370 | qemu_iovec_to_buf(qiov, qiov->size - count, tmp_buf, count); |
9a8c4cce KW |
2371 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
2372 | return ret; | |
83f64091 | 2373 | } |
8d3b1a2d KW |
2374 | return qiov->size; |
2375 | } | |
2376 | ||
2377 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
2378 | const void *buf, int count1) | |
2379 | { | |
2380 | QEMUIOVector qiov; | |
2381 | struct iovec iov = { | |
2382 | .iov_base = (void *) buf, | |
2383 | .iov_len = count1, | |
2384 | }; | |
2385 | ||
2386 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2387 | return bdrv_pwritev(bs, offset, &qiov); | |
83f64091 | 2388 | } |
83f64091 | 2389 | |
f08145fe KW |
2390 | /* |
2391 | * Writes to the file and ensures that no writes are reordered across this | |
2392 | * request (acts as a barrier) | |
2393 | * | |
2394 | * Returns 0 on success, -errno in error cases. | |
2395 | */ | |
2396 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
2397 | const void *buf, int count) | |
2398 | { | |
2399 | int ret; | |
2400 | ||
2401 | ret = bdrv_pwrite(bs, offset, buf, count); | |
2402 | if (ret < 0) { | |
2403 | return ret; | |
2404 | } | |
2405 | ||
f05fa4ad PB |
2406 | /* No flush needed for cache modes that already do it */ |
2407 | if (bs->enable_write_cache) { | |
f08145fe KW |
2408 | bdrv_flush(bs); |
2409 | } | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
470c0504 | 2414 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
ab185921 SH |
2415 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
2416 | { | |
2417 | /* Perform I/O through a temporary buffer so that users who scribble over | |
2418 | * their read buffer while the operation is in progress do not end up | |
2419 | * modifying the image file. This is critical for zero-copy guest I/O | |
2420 | * where anything might happen inside guest memory. | |
2421 | */ | |
2422 | void *bounce_buffer; | |
2423 | ||
79c053bd | 2424 | BlockDriver *drv = bs->drv; |
ab185921 SH |
2425 | struct iovec iov; |
2426 | QEMUIOVector bounce_qiov; | |
2427 | int64_t cluster_sector_num; | |
2428 | int cluster_nb_sectors; | |
2429 | size_t skip_bytes; | |
2430 | int ret; | |
2431 | ||
2432 | /* Cover entire cluster so no additional backing file I/O is required when | |
2433 | * allocating cluster in the image file. | |
2434 | */ | |
343bded4 PB |
2435 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
2436 | &cluster_sector_num, &cluster_nb_sectors); | |
ab185921 | 2437 | |
470c0504 SH |
2438 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
2439 | cluster_sector_num, cluster_nb_sectors); | |
ab185921 SH |
2440 | |
2441 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; | |
2442 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); | |
2443 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); | |
2444 | ||
79c053bd SH |
2445 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
2446 | &bounce_qiov); | |
ab185921 SH |
2447 | if (ret < 0) { |
2448 | goto err; | |
2449 | } | |
2450 | ||
79c053bd SH |
2451 | if (drv->bdrv_co_write_zeroes && |
2452 | buffer_is_zero(bounce_buffer, iov.iov_len)) { | |
621f0589 KW |
2453 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
2454 | cluster_nb_sectors); | |
79c053bd | 2455 | } else { |
f05fa4ad PB |
2456 | /* This does not change the data on the disk, it is not necessary |
2457 | * to flush even in cache=writethrough mode. | |
2458 | */ | |
79c053bd | 2459 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
ab185921 | 2460 | &bounce_qiov); |
79c053bd SH |
2461 | } |
2462 | ||
ab185921 SH |
2463 | if (ret < 0) { |
2464 | /* It might be okay to ignore write errors for guest requests. If this | |
2465 | * is a deliberate copy-on-read then we don't want to ignore the error. | |
2466 | * Simply report it in all cases. | |
2467 | */ | |
2468 | goto err; | |
2469 | } | |
2470 | ||
2471 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; | |
03396148 MT |
2472 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
2473 | nb_sectors * BDRV_SECTOR_SIZE); | |
ab185921 SH |
2474 | |
2475 | err: | |
2476 | qemu_vfree(bounce_buffer); | |
2477 | return ret; | |
2478 | } | |
2479 | ||
c5fbe571 SH |
2480 | /* |
2481 | * Handle a read request in coroutine context | |
2482 | */ | |
2483 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, | |
470c0504 SH |
2484 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2485 | BdrvRequestFlags flags) | |
da1fa91d KW |
2486 | { |
2487 | BlockDriver *drv = bs->drv; | |
dbffbdcf SH |
2488 | BdrvTrackedRequest req; |
2489 | int ret; | |
da1fa91d | 2490 | |
da1fa91d KW |
2491 | if (!drv) { |
2492 | return -ENOMEDIUM; | |
2493 | } | |
2494 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2495 | return -EIO; | |
2496 | } | |
2497 | ||
98f90dba ZYW |
2498 | /* throttling disk read I/O */ |
2499 | if (bs->io_limits_enabled) { | |
2500 | bdrv_io_limits_intercept(bs, false, nb_sectors); | |
2501 | } | |
2502 | ||
f4658285 | 2503 | if (bs->copy_on_read) { |
470c0504 SH |
2504 | flags |= BDRV_REQ_COPY_ON_READ; |
2505 | } | |
2506 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2507 | bs->copy_on_read_in_flight++; | |
2508 | } | |
2509 | ||
2510 | if (bs->copy_on_read_in_flight) { | |
f4658285 SH |
2511 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2512 | } | |
2513 | ||
dbffbdcf | 2514 | tracked_request_begin(&req, bs, sector_num, nb_sectors, false); |
ab185921 | 2515 | |
470c0504 | 2516 | if (flags & BDRV_REQ_COPY_ON_READ) { |
ab185921 SH |
2517 | int pnum; |
2518 | ||
2519 | ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); | |
2520 | if (ret < 0) { | |
2521 | goto out; | |
2522 | } | |
2523 | ||
2524 | if (!ret || pnum != nb_sectors) { | |
470c0504 | 2525 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2526 | goto out; |
2527 | } | |
2528 | } | |
2529 | ||
dbffbdcf | 2530 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
ab185921 SH |
2531 | |
2532 | out: | |
dbffbdcf | 2533 | tracked_request_end(&req); |
470c0504 SH |
2534 | |
2535 | if (flags & BDRV_REQ_COPY_ON_READ) { | |
2536 | bs->copy_on_read_in_flight--; | |
2537 | } | |
2538 | ||
dbffbdcf | 2539 | return ret; |
da1fa91d KW |
2540 | } |
2541 | ||
c5fbe571 | 2542 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
da1fa91d KW |
2543 | int nb_sectors, QEMUIOVector *qiov) |
2544 | { | |
c5fbe571 | 2545 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
da1fa91d | 2546 | |
470c0504 SH |
2547 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
2548 | } | |
2549 | ||
2550 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, | |
2551 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) | |
2552 | { | |
2553 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); | |
2554 | ||
2555 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, | |
2556 | BDRV_REQ_COPY_ON_READ); | |
c5fbe571 SH |
2557 | } |
2558 | ||
f08f2dda SH |
2559 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
2560 | int64_t sector_num, int nb_sectors) | |
2561 | { | |
2562 | BlockDriver *drv = bs->drv; | |
2563 | QEMUIOVector qiov; | |
2564 | struct iovec iov; | |
2565 | int ret; | |
2566 | ||
621f0589 KW |
2567 | /* TODO Emulate only part of misaligned requests instead of letting block |
2568 | * drivers return -ENOTSUP and emulate everything */ | |
2569 | ||
f08f2dda SH |
2570 | /* First try the efficient write zeroes operation */ |
2571 | if (drv->bdrv_co_write_zeroes) { | |
621f0589 KW |
2572 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
2573 | if (ret != -ENOTSUP) { | |
2574 | return ret; | |
2575 | } | |
f08f2dda SH |
2576 | } |
2577 | ||
2578 | /* Fall back to bounce buffer if write zeroes is unsupported */ | |
2579 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2580 | iov.iov_base = qemu_blockalign(bs, iov.iov_len); | |
2581 | memset(iov.iov_base, 0, iov.iov_len); | |
2582 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2583 | ||
2584 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
2585 | ||
2586 | qemu_vfree(iov.iov_base); | |
2587 | return ret; | |
2588 | } | |
2589 | ||
c5fbe571 SH |
2590 | /* |
2591 | * Handle a write request in coroutine context | |
2592 | */ | |
2593 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, | |
f08f2dda SH |
2594 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
2595 | BdrvRequestFlags flags) | |
c5fbe571 SH |
2596 | { |
2597 | BlockDriver *drv = bs->drv; | |
dbffbdcf | 2598 | BdrvTrackedRequest req; |
6b7cb247 | 2599 | int ret; |
da1fa91d KW |
2600 | |
2601 | if (!bs->drv) { | |
2602 | return -ENOMEDIUM; | |
2603 | } | |
2604 | if (bs->read_only) { | |
2605 | return -EACCES; | |
2606 | } | |
2607 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
2608 | return -EIO; | |
2609 | } | |
2610 | ||
98f90dba ZYW |
2611 | /* throttling disk write I/O */ |
2612 | if (bs->io_limits_enabled) { | |
2613 | bdrv_io_limits_intercept(bs, true, nb_sectors); | |
2614 | } | |
2615 | ||
470c0504 | 2616 | if (bs->copy_on_read_in_flight) { |
f4658285 SH |
2617 | wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
2618 | } | |
2619 | ||
dbffbdcf SH |
2620 | tracked_request_begin(&req, bs, sector_num, nb_sectors, true); |
2621 | ||
d616b224 SH |
2622 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req); |
2623 | ||
2624 | if (ret < 0) { | |
2625 | /* Do nothing, write notifier decided to fail this request */ | |
2626 | } else if (flags & BDRV_REQ_ZERO_WRITE) { | |
f08f2dda SH |
2627 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); |
2628 | } else { | |
2629 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
2630 | } | |
6b7cb247 | 2631 | |
f05fa4ad PB |
2632 | if (ret == 0 && !bs->enable_write_cache) { |
2633 | ret = bdrv_co_flush(bs); | |
2634 | } | |
2635 | ||
da1fa91d | 2636 | if (bs->dirty_bitmap) { |
1755da16 | 2637 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
da1fa91d KW |
2638 | } |
2639 | ||
2640 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2641 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2642 | } | |
2643 | ||
dbffbdcf SH |
2644 | tracked_request_end(&req); |
2645 | ||
6b7cb247 | 2646 | return ret; |
da1fa91d KW |
2647 | } |
2648 | ||
c5fbe571 SH |
2649 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
2650 | int nb_sectors, QEMUIOVector *qiov) | |
2651 | { | |
2652 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
2653 | ||
f08f2dda SH |
2654 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
2655 | } | |
2656 | ||
2657 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, | |
2658 | int64_t sector_num, int nb_sectors) | |
2659 | { | |
2660 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); | |
2661 | ||
2662 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, | |
2663 | BDRV_REQ_ZERO_WRITE); | |
c5fbe571 SH |
2664 | } |
2665 | ||
83f64091 FB |
2666 | /** |
2667 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
2668 | */ | |
2669 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
2670 | { | |
2671 | BlockDriver *drv = bs->drv; | |
51762288 | 2672 | int ret; |
83f64091 | 2673 | if (!drv) |
19cb3738 | 2674 | return -ENOMEDIUM; |
83f64091 FB |
2675 | if (!drv->bdrv_truncate) |
2676 | return -ENOTSUP; | |
59f2689d NS |
2677 | if (bs->read_only) |
2678 | return -EACCES; | |
8591675f MT |
2679 | if (bdrv_in_use(bs)) |
2680 | return -EBUSY; | |
51762288 SH |
2681 | ret = drv->bdrv_truncate(bs, offset); |
2682 | if (ret == 0) { | |
2683 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
145feb17 | 2684 | bdrv_dev_resize_cb(bs); |
51762288 SH |
2685 | } |
2686 | return ret; | |
83f64091 FB |
2687 | } |
2688 | ||
4a1d5e1f FZ |
2689 | /** |
2690 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
2691 | * allocated space. Return < 0 if error or unknown. | |
2692 | */ | |
2693 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
2694 | { | |
2695 | BlockDriver *drv = bs->drv; | |
2696 | if (!drv) { | |
2697 | return -ENOMEDIUM; | |
2698 | } | |
2699 | if (drv->bdrv_get_allocated_file_size) { | |
2700 | return drv->bdrv_get_allocated_file_size(bs); | |
2701 | } | |
2702 | if (bs->file) { | |
2703 | return bdrv_get_allocated_file_size(bs->file); | |
2704 | } | |
2705 | return -ENOTSUP; | |
2706 | } | |
2707 | ||
83f64091 FB |
2708 | /** |
2709 | * Length of a file in bytes. Return < 0 if error or unknown. | |
2710 | */ | |
2711 | int64_t bdrv_getlength(BlockDriverState *bs) | |
2712 | { | |
2713 | BlockDriver *drv = bs->drv; | |
2714 | if (!drv) | |
19cb3738 | 2715 | return -ENOMEDIUM; |
51762288 | 2716 | |
2c6942fa | 2717 | if (bs->growable || bdrv_dev_has_removable_media(bs)) { |
46a4e4e6 SH |
2718 | if (drv->bdrv_getlength) { |
2719 | return drv->bdrv_getlength(bs); | |
2720 | } | |
83f64091 | 2721 | } |
46a4e4e6 | 2722 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
2723 | } |
2724 | ||
19cb3738 | 2725 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 2726 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 2727 | { |
19cb3738 FB |
2728 | int64_t length; |
2729 | length = bdrv_getlength(bs); | |
2730 | if (length < 0) | |
2731 | length = 0; | |
2732 | else | |
6ea44308 | 2733 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 2734 | *nb_sectors_ptr = length; |
fc01f7e7 | 2735 | } |
cf98951b | 2736 | |
0563e191 ZYW |
2737 | /* throttling disk io limits */ |
2738 | void bdrv_set_io_limits(BlockDriverState *bs, | |
2739 | BlockIOLimit *io_limits) | |
2740 | { | |
2741 | bs->io_limits = *io_limits; | |
2742 | bs->io_limits_enabled = bdrv_io_limits_enabled(bs); | |
2743 | } | |
2744 | ||
ff06f5f3 PB |
2745 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
2746 | BlockdevOnError on_write_error) | |
abd7f68d MA |
2747 | { |
2748 | bs->on_read_error = on_read_error; | |
2749 | bs->on_write_error = on_write_error; | |
2750 | } | |
2751 | ||
1ceee0d5 | 2752 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
abd7f68d MA |
2753 | { |
2754 | return is_read ? bs->on_read_error : bs->on_write_error; | |
2755 | } | |
2756 | ||
3e1caa5f PB |
2757 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
2758 | { | |
2759 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; | |
2760 | ||
2761 | switch (on_err) { | |
2762 | case BLOCKDEV_ON_ERROR_ENOSPC: | |
2763 | return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT; | |
2764 | case BLOCKDEV_ON_ERROR_STOP: | |
2765 | return BDRV_ACTION_STOP; | |
2766 | case BLOCKDEV_ON_ERROR_REPORT: | |
2767 | return BDRV_ACTION_REPORT; | |
2768 | case BLOCKDEV_ON_ERROR_IGNORE: | |
2769 | return BDRV_ACTION_IGNORE; | |
2770 | default: | |
2771 | abort(); | |
2772 | } | |
2773 | } | |
2774 | ||
2775 | /* This is done by device models because, while the block layer knows | |
2776 | * about the error, it does not know whether an operation comes from | |
2777 | * the device or the block layer (from a job, for example). | |
2778 | */ | |
2779 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, | |
2780 | bool is_read, int error) | |
2781 | { | |
2782 | assert(error >= 0); | |
32c81a4a | 2783 | bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read); |
3e1caa5f PB |
2784 | if (action == BDRV_ACTION_STOP) { |
2785 | vm_stop(RUN_STATE_IO_ERROR); | |
2786 | bdrv_iostatus_set_err(bs, error); | |
2787 | } | |
2788 | } | |
2789 | ||
b338082b FB |
2790 | int bdrv_is_read_only(BlockDriverState *bs) |
2791 | { | |
2792 | return bs->read_only; | |
2793 | } | |
2794 | ||
985a03b0 TS |
2795 | int bdrv_is_sg(BlockDriverState *bs) |
2796 | { | |
2797 | return bs->sg; | |
2798 | } | |
2799 | ||
e900a7b7 CH |
2800 | int bdrv_enable_write_cache(BlockDriverState *bs) |
2801 | { | |
2802 | return bs->enable_write_cache; | |
2803 | } | |
2804 | ||
425b0148 PB |
2805 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
2806 | { | |
2807 | bs->enable_write_cache = wce; | |
55b110f2 JC |
2808 | |
2809 | /* so a reopen() will preserve wce */ | |
2810 | if (wce) { | |
2811 | bs->open_flags |= BDRV_O_CACHE_WB; | |
2812 | } else { | |
2813 | bs->open_flags &= ~BDRV_O_CACHE_WB; | |
2814 | } | |
425b0148 PB |
2815 | } |
2816 | ||
ea2384d3 FB |
2817 | int bdrv_is_encrypted(BlockDriverState *bs) |
2818 | { | |
2819 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2820 | return 1; | |
2821 | return bs->encrypted; | |
2822 | } | |
2823 | ||
c0f4ce77 AL |
2824 | int bdrv_key_required(BlockDriverState *bs) |
2825 | { | |
2826 | BlockDriverState *backing_hd = bs->backing_hd; | |
2827 | ||
2828 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
2829 | return 1; | |
2830 | return (bs->encrypted && !bs->valid_key); | |
2831 | } | |
2832 | ||
ea2384d3 FB |
2833 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
2834 | { | |
2835 | int ret; | |
2836 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
2837 | ret = bdrv_set_key(bs->backing_hd, key); | |
2838 | if (ret < 0) | |
2839 | return ret; | |
2840 | if (!bs->encrypted) | |
2841 | return 0; | |
2842 | } | |
fd04a2ae SH |
2843 | if (!bs->encrypted) { |
2844 | return -EINVAL; | |
2845 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
2846 | return -ENOMEDIUM; | |
2847 | } | |
c0f4ce77 | 2848 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
2849 | if (ret < 0) { |
2850 | bs->valid_key = 0; | |
2851 | } else if (!bs->valid_key) { | |
2852 | bs->valid_key = 1; | |
2853 | /* call the change callback now, we skipped it on open */ | |
7d4b4ba5 | 2854 | bdrv_dev_change_media_cb(bs, true); |
bb5fc20f | 2855 | } |
c0f4ce77 | 2856 | return ret; |
ea2384d3 FB |
2857 | } |
2858 | ||
f8d6bba1 | 2859 | const char *bdrv_get_format_name(BlockDriverState *bs) |
ea2384d3 | 2860 | { |
f8d6bba1 | 2861 | return bs->drv ? bs->drv->format_name : NULL; |
ea2384d3 FB |
2862 | } |
2863 | ||
5fafdf24 | 2864 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
2865 | void *opaque) |
2866 | { | |
2867 | BlockDriver *drv; | |
2868 | ||
8a22f02a | 2869 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
2870 | it(opaque, drv->format_name); |
2871 | } | |
2872 | } | |
2873 | ||
b338082b FB |
2874 | BlockDriverState *bdrv_find(const char *name) |
2875 | { | |
2876 | BlockDriverState *bs; | |
2877 | ||
1b7bdbc1 SH |
2878 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2879 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 2880 | return bs; |
1b7bdbc1 | 2881 | } |
b338082b FB |
2882 | } |
2883 | return NULL; | |
2884 | } | |
2885 | ||
2f399b0a MA |
2886 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
2887 | { | |
2888 | if (!bs) { | |
2889 | return QTAILQ_FIRST(&bdrv_states); | |
2890 | } | |
2891 | return QTAILQ_NEXT(bs, list); | |
2892 | } | |
2893 | ||
51de9760 | 2894 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
2895 | { |
2896 | BlockDriverState *bs; | |
2897 | ||
1b7bdbc1 | 2898 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 2899 | it(opaque, bs); |
81d0912d FB |
2900 | } |
2901 | } | |
2902 | ||
ea2384d3 FB |
2903 | const char *bdrv_get_device_name(BlockDriverState *bs) |
2904 | { | |
2905 | return bs->device_name; | |
2906 | } | |
2907 | ||
c8433287 MA |
2908 | int bdrv_get_flags(BlockDriverState *bs) |
2909 | { | |
2910 | return bs->open_flags; | |
2911 | } | |
2912 | ||
c6ca28d6 AL |
2913 | void bdrv_flush_all(void) |
2914 | { | |
2915 | BlockDriverState *bs; | |
2916 | ||
1b7bdbc1 | 2917 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
29cdb251 | 2918 | bdrv_flush(bs); |
1b7bdbc1 | 2919 | } |
c6ca28d6 AL |
2920 | } |
2921 | ||
3ac21627 PL |
2922 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
2923 | { | |
2924 | return 1; | |
2925 | } | |
2926 | ||
f2feebbd KW |
2927 | int bdrv_has_zero_init(BlockDriverState *bs) |
2928 | { | |
2929 | assert(bs->drv); | |
2930 | ||
336c1c12 KW |
2931 | if (bs->drv->bdrv_has_zero_init) { |
2932 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
2933 | } |
2934 | ||
3ac21627 PL |
2935 | /* safe default */ |
2936 | return 0; | |
f2feebbd KW |
2937 | } |
2938 | ||
376ae3f1 SH |
2939 | typedef struct BdrvCoIsAllocatedData { |
2940 | BlockDriverState *bs; | |
b35b2bba | 2941 | BlockDriverState *base; |
376ae3f1 SH |
2942 | int64_t sector_num; |
2943 | int nb_sectors; | |
2944 | int *pnum; | |
2945 | int ret; | |
2946 | bool done; | |
2947 | } BdrvCoIsAllocatedData; | |
2948 | ||
f58c7b35 TS |
2949 | /* |
2950 | * Returns true iff the specified sector is present in the disk image. Drivers | |
2951 | * not implementing the functionality are assumed to not support backing files, | |
2952 | * hence all their sectors are reported as allocated. | |
2953 | * | |
bd9533e3 SH |
2954 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
2955 | * and 'pnum' is set to 0. | |
2956 | * | |
f58c7b35 TS |
2957 | * 'pnum' is set to the number of sectors (including and immediately following |
2958 | * the specified sector) that are known to be in the same | |
2959 | * allocated/unallocated state. | |
2960 | * | |
bd9533e3 SH |
2961 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
2962 | * beyond the end of the disk image it will be clamped. | |
f58c7b35 | 2963 | */ |
060f51c9 SH |
2964 | int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, |
2965 | int nb_sectors, int *pnum) | |
f58c7b35 | 2966 | { |
bd9533e3 SH |
2967 | int64_t n; |
2968 | ||
2969 | if (sector_num >= bs->total_sectors) { | |
2970 | *pnum = 0; | |
2971 | return 0; | |
2972 | } | |
2973 | ||
2974 | n = bs->total_sectors - sector_num; | |
2975 | if (n < nb_sectors) { | |
2976 | nb_sectors = n; | |
2977 | } | |
2978 | ||
6aebab14 | 2979 | if (!bs->drv->bdrv_co_is_allocated) { |
bd9533e3 | 2980 | *pnum = nb_sectors; |
f58c7b35 TS |
2981 | return 1; |
2982 | } | |
6aebab14 | 2983 | |
060f51c9 SH |
2984 | return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum); |
2985 | } | |
2986 | ||
2987 | /* Coroutine wrapper for bdrv_is_allocated() */ | |
2988 | static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) | |
2989 | { | |
2990 | BdrvCoIsAllocatedData *data = opaque; | |
2991 | BlockDriverState *bs = data->bs; | |
2992 | ||
2993 | data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, | |
2994 | data->pnum); | |
2995 | data->done = true; | |
2996 | } | |
2997 | ||
2998 | /* | |
2999 | * Synchronous wrapper around bdrv_co_is_allocated(). | |
3000 | * | |
3001 | * See bdrv_co_is_allocated() for details. | |
3002 | */ | |
3003 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
3004 | int *pnum) | |
3005 | { | |
6aebab14 SH |
3006 | Coroutine *co; |
3007 | BdrvCoIsAllocatedData data = { | |
3008 | .bs = bs, | |
3009 | .sector_num = sector_num, | |
3010 | .nb_sectors = nb_sectors, | |
3011 | .pnum = pnum, | |
3012 | .done = false, | |
3013 | }; | |
3014 | ||
3015 | co = qemu_coroutine_create(bdrv_is_allocated_co_entry); | |
3016 | qemu_coroutine_enter(co, &data); | |
3017 | while (!data.done) { | |
3018 | qemu_aio_wait(); | |
3019 | } | |
3020 | return data.ret; | |
f58c7b35 TS |
3021 | } |
3022 | ||
188a7bbf PB |
3023 | /* |
3024 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] | |
3025 | * | |
3026 | * Return true if the given sector is allocated in any image between | |
3027 | * BASE and TOP (inclusive). BASE can be NULL to check if the given | |
3028 | * sector is allocated in any image of the chain. Return false otherwise. | |
3029 | * | |
3030 | * 'pnum' is set to the number of sectors (including and immediately following | |
3031 | * the specified sector) that are known to be in the same | |
3032 | * allocated/unallocated state. | |
3033 | * | |
3034 | */ | |
3035 | int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, | |
3036 | BlockDriverState *base, | |
3037 | int64_t sector_num, | |
3038 | int nb_sectors, int *pnum) | |
3039 | { | |
3040 | BlockDriverState *intermediate; | |
3041 | int ret, n = nb_sectors; | |
3042 | ||
3043 | intermediate = top; | |
3044 | while (intermediate && intermediate != base) { | |
3045 | int pnum_inter; | |
3046 | ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors, | |
3047 | &pnum_inter); | |
3048 | if (ret < 0) { | |
3049 | return ret; | |
3050 | } else if (ret) { | |
3051 | *pnum = pnum_inter; | |
3052 | return 1; | |
3053 | } | |
3054 | ||
3055 | /* | |
3056 | * [sector_num, nb_sectors] is unallocated on top but intermediate | |
3057 | * might have | |
3058 | * | |
3059 | * [sector_num+x, nr_sectors] allocated. | |
3060 | */ | |
63ba17d3 VI |
3061 | if (n > pnum_inter && |
3062 | (intermediate == top || | |
3063 | sector_num + pnum_inter < intermediate->total_sectors)) { | |
188a7bbf PB |
3064 | n = pnum_inter; |
3065 | } | |
3066 | ||
3067 | intermediate = intermediate->backing_hd; | |
3068 | } | |
3069 | ||
3070 | *pnum = n; | |
3071 | return 0; | |
3072 | } | |
3073 | ||
b35b2bba MR |
3074 | /* Coroutine wrapper for bdrv_is_allocated_above() */ |
3075 | static void coroutine_fn bdrv_is_allocated_above_co_entry(void *opaque) | |
3076 | { | |
3077 | BdrvCoIsAllocatedData *data = opaque; | |
3078 | BlockDriverState *top = data->bs; | |
3079 | BlockDriverState *base = data->base; | |
3080 | ||
3081 | data->ret = bdrv_co_is_allocated_above(top, base, data->sector_num, | |
3082 | data->nb_sectors, data->pnum); | |
3083 | data->done = true; | |
3084 | } | |
3085 | ||
3086 | /* | |
3087 | * Synchronous wrapper around bdrv_co_is_allocated_above(). | |
3088 | * | |
3089 | * See bdrv_co_is_allocated_above() for details. | |
3090 | */ | |
3091 | int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, | |
3092 | int64_t sector_num, int nb_sectors, int *pnum) | |
3093 | { | |
3094 | Coroutine *co; | |
3095 | BdrvCoIsAllocatedData data = { | |
3096 | .bs = top, | |
3097 | .base = base, | |
3098 | .sector_num = sector_num, | |
3099 | .nb_sectors = nb_sectors, | |
3100 | .pnum = pnum, | |
3101 | .done = false, | |
3102 | }; | |
3103 | ||
3104 | co = qemu_coroutine_create(bdrv_is_allocated_above_co_entry); | |
3105 | qemu_coroutine_enter(co, &data); | |
3106 | while (!data.done) { | |
3107 | qemu_aio_wait(); | |
3108 | } | |
3109 | return data.ret; | |
3110 | } | |
3111 | ||
045df330 AL |
3112 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
3113 | { | |
3114 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
3115 | return bs->backing_file; | |
3116 | else if (bs->encrypted) | |
3117 | return bs->filename; | |
3118 | else | |
3119 | return NULL; | |
3120 | } | |
3121 | ||
5fafdf24 | 3122 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
3123 | char *filename, int filename_size) |
3124 | { | |
3574c608 | 3125 | pstrcpy(filename, filename_size, bs->backing_file); |
83f64091 FB |
3126 | } |
3127 | ||
5fafdf24 | 3128 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
3129 | const uint8_t *buf, int nb_sectors) |
3130 | { | |
3131 | BlockDriver *drv = bs->drv; | |
3132 | if (!drv) | |
19cb3738 | 3133 | return -ENOMEDIUM; |
faea38e7 FB |
3134 | if (!drv->bdrv_write_compressed) |
3135 | return -ENOTSUP; | |
fbb7b4e0 KW |
3136 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
3137 | return -EIO; | |
a55eb92c | 3138 | |
1755da16 | 3139 | assert(!bs->dirty_bitmap); |
a55eb92c | 3140 | |
faea38e7 FB |
3141 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
3142 | } | |
3b46e624 | 3143 | |
faea38e7 FB |
3144 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
3145 | { | |
3146 | BlockDriver *drv = bs->drv; | |
3147 | if (!drv) | |
19cb3738 | 3148 | return -ENOMEDIUM; |
faea38e7 FB |
3149 | if (!drv->bdrv_get_info) |
3150 | return -ENOTSUP; | |
3151 | memset(bdi, 0, sizeof(*bdi)); | |
3152 | return drv->bdrv_get_info(bs, bdi); | |
3153 | } | |
3154 | ||
45566e9c CH |
3155 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
3156 | int64_t pos, int size) | |
cf8074b3 KW |
3157 | { |
3158 | QEMUIOVector qiov; | |
3159 | struct iovec iov = { | |
3160 | .iov_base = (void *) buf, | |
3161 | .iov_len = size, | |
3162 | }; | |
3163 | ||
3164 | qemu_iovec_init_external(&qiov, &iov, 1); | |
3165 | return bdrv_writev_vmstate(bs, &qiov, pos); | |
3166 | } | |
3167 | ||
3168 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) | |
178e08a5 AL |
3169 | { |
3170 | BlockDriver *drv = bs->drv; | |
cf8074b3 KW |
3171 | |
3172 | if (!drv) { | |
178e08a5 | 3173 | return -ENOMEDIUM; |
cf8074b3 KW |
3174 | } else if (drv->bdrv_save_vmstate) { |
3175 | return drv->bdrv_save_vmstate(bs, qiov, pos); | |
3176 | } else if (bs->file) { | |
3177 | return bdrv_writev_vmstate(bs->file, qiov, pos); | |
3178 | } | |
3179 | ||
7cdb1f6d | 3180 | return -ENOTSUP; |
178e08a5 AL |
3181 | } |
3182 | ||
45566e9c CH |
3183 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
3184 | int64_t pos, int size) | |
178e08a5 AL |
3185 | { |
3186 | BlockDriver *drv = bs->drv; | |
3187 | if (!drv) | |
3188 | return -ENOMEDIUM; | |
7cdb1f6d MK |
3189 | if (drv->bdrv_load_vmstate) |
3190 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
3191 | if (bs->file) | |
3192 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
3193 | return -ENOTSUP; | |
178e08a5 AL |
3194 | } |
3195 | ||
8b9b0cc2 KW |
3196 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
3197 | { | |
bf736fe3 | 3198 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
8b9b0cc2 KW |
3199 | return; |
3200 | } | |
3201 | ||
bf736fe3 | 3202 | bs->drv->bdrv_debug_event(bs, event); |
41c695c7 KW |
3203 | } |
3204 | ||
3205 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, | |
3206 | const char *tag) | |
3207 | { | |
3208 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { | |
3209 | bs = bs->file; | |
3210 | } | |
3211 | ||
3212 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { | |
3213 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); | |
3214 | } | |
3215 | ||
3216 | return -ENOTSUP; | |
3217 | } | |
3218 | ||
3219 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) | |
3220 | { | |
3221 | while (bs && bs->drv && !bs->drv->bdrv_debug_resume) { | |
3222 | bs = bs->file; | |
3223 | } | |
8b9b0cc2 | 3224 | |
41c695c7 KW |
3225 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
3226 | return bs->drv->bdrv_debug_resume(bs, tag); | |
3227 | } | |
3228 | ||
3229 | return -ENOTSUP; | |
3230 | } | |
3231 | ||
3232 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) | |
3233 | { | |
3234 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { | |
3235 | bs = bs->file; | |
3236 | } | |
3237 | ||
3238 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { | |
3239 | return bs->drv->bdrv_debug_is_suspended(bs, tag); | |
3240 | } | |
3241 | ||
3242 | return false; | |
8b9b0cc2 KW |
3243 | } |
3244 | ||
199630b6 BS |
3245 | int bdrv_is_snapshot(BlockDriverState *bs) |
3246 | { | |
3247 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
3248 | } | |
3249 | ||
b1b1d783 JC |
3250 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
3251 | * relative, it must be relative to the chain. So, passing in bs->filename | |
3252 | * from a BDS as backing_file should not be done, as that may be relative to | |
3253 | * the CWD rather than the chain. */ | |
e8a6bb9c MT |
3254 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
3255 | const char *backing_file) | |
3256 | { | |
b1b1d783 JC |
3257 | char *filename_full = NULL; |
3258 | char *backing_file_full = NULL; | |
3259 | char *filename_tmp = NULL; | |
3260 | int is_protocol = 0; | |
3261 | BlockDriverState *curr_bs = NULL; | |
3262 | BlockDriverState *retval = NULL; | |
3263 | ||
3264 | if (!bs || !bs->drv || !backing_file) { | |
e8a6bb9c MT |
3265 | return NULL; |
3266 | } | |
3267 | ||
b1b1d783 JC |
3268 | filename_full = g_malloc(PATH_MAX); |
3269 | backing_file_full = g_malloc(PATH_MAX); | |
3270 | filename_tmp = g_malloc(PATH_MAX); | |
3271 | ||
3272 | is_protocol = path_has_protocol(backing_file); | |
3273 | ||
3274 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { | |
3275 | ||
3276 | /* If either of the filename paths is actually a protocol, then | |
3277 | * compare unmodified paths; otherwise make paths relative */ | |
3278 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { | |
3279 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { | |
3280 | retval = curr_bs->backing_hd; | |
3281 | break; | |
3282 | } | |
e8a6bb9c | 3283 | } else { |
b1b1d783 JC |
3284 | /* If not an absolute filename path, make it relative to the current |
3285 | * image's filename path */ | |
3286 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3287 | backing_file); | |
3288 | ||
3289 | /* We are going to compare absolute pathnames */ | |
3290 | if (!realpath(filename_tmp, filename_full)) { | |
3291 | continue; | |
3292 | } | |
3293 | ||
3294 | /* We need to make sure the backing filename we are comparing against | |
3295 | * is relative to the current image filename (or absolute) */ | |
3296 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, | |
3297 | curr_bs->backing_file); | |
3298 | ||
3299 | if (!realpath(filename_tmp, backing_file_full)) { | |
3300 | continue; | |
3301 | } | |
3302 | ||
3303 | if (strcmp(backing_file_full, filename_full) == 0) { | |
3304 | retval = curr_bs->backing_hd; | |
3305 | break; | |
3306 | } | |
e8a6bb9c MT |
3307 | } |
3308 | } | |
3309 | ||
b1b1d783 JC |
3310 | g_free(filename_full); |
3311 | g_free(backing_file_full); | |
3312 | g_free(filename_tmp); | |
3313 | return retval; | |
e8a6bb9c MT |
3314 | } |
3315 | ||
f198fd1c BC |
3316 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
3317 | { | |
3318 | if (!bs->drv) { | |
3319 | return 0; | |
3320 | } | |
3321 | ||
3322 | if (!bs->backing_hd) { | |
3323 | return 0; | |
3324 | } | |
3325 | ||
3326 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); | |
3327 | } | |
3328 | ||
79fac568 JC |
3329 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
3330 | { | |
3331 | BlockDriverState *curr_bs = NULL; | |
3332 | ||
3333 | if (!bs) { | |
3334 | return NULL; | |
3335 | } | |
3336 | ||
3337 | curr_bs = bs; | |
3338 | ||
3339 | while (curr_bs->backing_hd) { | |
3340 | curr_bs = curr_bs->backing_hd; | |
3341 | } | |
3342 | return curr_bs; | |
3343 | } | |
3344 | ||
ea2384d3 | 3345 | /**************************************************************/ |
83f64091 | 3346 | /* async I/Os */ |
ea2384d3 | 3347 | |
3b69e4b9 | 3348 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 3349 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 3350 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 | 3351 | { |
bbf0a440 SH |
3352 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
3353 | ||
b2a61371 | 3354 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3355 | cb, opaque, false); |
ea2384d3 FB |
3356 | } |
3357 | ||
f141eafe AL |
3358 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
3359 | QEMUIOVector *qiov, int nb_sectors, | |
3360 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 3361 | { |
bbf0a440 SH |
3362 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
3363 | ||
1a6e115b | 3364 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, |
8c5873d6 | 3365 | cb, opaque, true); |
83f64091 FB |
3366 | } |
3367 | ||
40b4f539 KW |
3368 | |
3369 | typedef struct MultiwriteCB { | |
3370 | int error; | |
3371 | int num_requests; | |
3372 | int num_callbacks; | |
3373 | struct { | |
3374 | BlockDriverCompletionFunc *cb; | |
3375 | void *opaque; | |
3376 | QEMUIOVector *free_qiov; | |
40b4f539 KW |
3377 | } callbacks[]; |
3378 | } MultiwriteCB; | |
3379 | ||
3380 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
3381 | { | |
3382 | int i; | |
3383 | ||
3384 | for (i = 0; i < mcb->num_callbacks; i++) { | |
3385 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
3386 | if (mcb->callbacks[i].free_qiov) { |
3387 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
3388 | } | |
7267c094 | 3389 | g_free(mcb->callbacks[i].free_qiov); |
40b4f539 KW |
3390 | } |
3391 | } | |
3392 | ||
3393 | static void multiwrite_cb(void *opaque, int ret) | |
3394 | { | |
3395 | MultiwriteCB *mcb = opaque; | |
3396 | ||
6d519a5f SH |
3397 | trace_multiwrite_cb(mcb, ret); |
3398 | ||
cb6d3ca0 | 3399 | if (ret < 0 && !mcb->error) { |
40b4f539 | 3400 | mcb->error = ret; |
40b4f539 KW |
3401 | } |
3402 | ||
3403 | mcb->num_requests--; | |
3404 | if (mcb->num_requests == 0) { | |
de189a1b | 3405 | multiwrite_user_cb(mcb); |
7267c094 | 3406 | g_free(mcb); |
40b4f539 KW |
3407 | } |
3408 | } | |
3409 | ||
3410 | static int multiwrite_req_compare(const void *a, const void *b) | |
3411 | { | |
77be4366 CH |
3412 | const BlockRequest *req1 = a, *req2 = b; |
3413 | ||
3414 | /* | |
3415 | * Note that we can't simply subtract req2->sector from req1->sector | |
3416 | * here as that could overflow the return value. | |
3417 | */ | |
3418 | if (req1->sector > req2->sector) { | |
3419 | return 1; | |
3420 | } else if (req1->sector < req2->sector) { | |
3421 | return -1; | |
3422 | } else { | |
3423 | return 0; | |
3424 | } | |
40b4f539 KW |
3425 | } |
3426 | ||
3427 | /* | |
3428 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
3429 | * requests that remain after merging. | |
3430 | */ | |
3431 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
3432 | int num_reqs, MultiwriteCB *mcb) | |
3433 | { | |
3434 | int i, outidx; | |
3435 | ||
3436 | // Sort requests by start sector | |
3437 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
3438 | ||
3439 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
3440 | // filling up gaps with zero sectors. | |
3441 | outidx = 0; | |
3442 | for (i = 1; i < num_reqs; i++) { | |
3443 | int merge = 0; | |
3444 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
3445 | ||
b6a127a1 | 3446 | // Handle exactly sequential writes and overlapping writes. |
40b4f539 KW |
3447 | if (reqs[i].sector <= oldreq_last) { |
3448 | merge = 1; | |
3449 | } | |
3450 | ||
e2a305fb CH |
3451 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
3452 | merge = 0; | |
3453 | } | |
3454 | ||
40b4f539 KW |
3455 | if (merge) { |
3456 | size_t size; | |
7267c094 | 3457 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
40b4f539 KW |
3458 | qemu_iovec_init(qiov, |
3459 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
3460 | ||
3461 | // Add the first request to the merged one. If the requests are | |
3462 | // overlapping, drop the last sectors of the first request. | |
3463 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1b093c48 | 3464 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
40b4f539 | 3465 | |
b6a127a1 PB |
3466 | // We should need to add any zeros between the two requests |
3467 | assert (reqs[i].sector <= oldreq_last); | |
40b4f539 KW |
3468 | |
3469 | // Add the second request | |
1b093c48 | 3470 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
40b4f539 | 3471 | |
cbf1dff2 | 3472 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
3473 | reqs[outidx].qiov = qiov; |
3474 | ||
3475 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
3476 | } else { | |
3477 | outidx++; | |
3478 | reqs[outidx].sector = reqs[i].sector; | |
3479 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
3480 | reqs[outidx].qiov = reqs[i].qiov; | |
3481 | } | |
3482 | } | |
3483 | ||
3484 | return outidx + 1; | |
3485 | } | |
3486 | ||
3487 | /* | |
3488 | * Submit multiple AIO write requests at once. | |
3489 | * | |
3490 | * On success, the function returns 0 and all requests in the reqs array have | |
3491 | * been submitted. In error case this function returns -1, and any of the | |
3492 | * requests may or may not be submitted yet. In particular, this means that the | |
3493 | * callback will be called for some of the requests, for others it won't. The | |
3494 | * caller must check the error field of the BlockRequest to wait for the right | |
3495 | * callbacks (if error != 0, no callback will be called). | |
3496 | * | |
3497 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
3498 | * requests. However, the fields opaque and error are left unmodified as they | |
3499 | * are used to signal failure for a single request to the caller. | |
3500 | */ | |
3501 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
3502 | { | |
40b4f539 KW |
3503 | MultiwriteCB *mcb; |
3504 | int i; | |
3505 | ||
301db7c2 RH |
3506 | /* don't submit writes if we don't have a medium */ |
3507 | if (bs->drv == NULL) { | |
3508 | for (i = 0; i < num_reqs; i++) { | |
3509 | reqs[i].error = -ENOMEDIUM; | |
3510 | } | |
3511 | return -1; | |
3512 | } | |
3513 | ||
40b4f539 KW |
3514 | if (num_reqs == 0) { |
3515 | return 0; | |
3516 | } | |
3517 | ||
3518 | // Create MultiwriteCB structure | |
7267c094 | 3519 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
40b4f539 KW |
3520 | mcb->num_requests = 0; |
3521 | mcb->num_callbacks = num_reqs; | |
3522 | ||
3523 | for (i = 0; i < num_reqs; i++) { | |
3524 | mcb->callbacks[i].cb = reqs[i].cb; | |
3525 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
3526 | } | |
3527 | ||
3528 | // Check for mergable requests | |
3529 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
3530 | ||
6d519a5f SH |
3531 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3532 | ||
df9309fb PB |
3533 | /* Run the aio requests. */ |
3534 | mcb->num_requests = num_reqs; | |
40b4f539 | 3535 | for (i = 0; i < num_reqs; i++) { |
ad54ae80 | 3536 | bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
40b4f539 | 3537 | reqs[i].nb_sectors, multiwrite_cb, mcb); |
40b4f539 KW |
3538 | } |
3539 | ||
3540 | return 0; | |
40b4f539 KW |
3541 | } |
3542 | ||
83f64091 | 3543 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 3544 | { |
d7331bed | 3545 | acb->aiocb_info->cancel(acb); |
83f64091 FB |
3546 | } |
3547 | ||
98f90dba ZYW |
3548 | /* block I/O throttling */ |
3549 | static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, | |
3550 | bool is_write, double elapsed_time, uint64_t *wait) | |
3551 | { | |
3552 | uint64_t bps_limit = 0; | |
ae29d6c6 | 3553 | uint64_t extension; |
98f90dba ZYW |
3554 | double bytes_limit, bytes_base, bytes_res; |
3555 | double slice_time, wait_time; | |
3556 | ||
3557 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { | |
3558 | bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; | |
3559 | } else if (bs->io_limits.bps[is_write]) { | |
3560 | bps_limit = bs->io_limits.bps[is_write]; | |
3561 | } else { | |
3562 | if (wait) { | |
3563 | *wait = 0; | |
3564 | } | |
3565 | ||
3566 | return false; | |
3567 | } | |
3568 | ||
3569 | slice_time = bs->slice_end - bs->slice_start; | |
3570 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3571 | bytes_limit = bps_limit * slice_time; | |
5905fbc9 | 3572 | bytes_base = bs->slice_submitted.bytes[is_write]; |
98f90dba | 3573 | if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) { |
5905fbc9 | 3574 | bytes_base += bs->slice_submitted.bytes[!is_write]; |
98f90dba ZYW |
3575 | } |
3576 | ||
3577 | /* bytes_base: the bytes of data which have been read/written; and | |
3578 | * it is obtained from the history statistic info. | |
3579 | * bytes_res: the remaining bytes of data which need to be read/written. | |
3580 | * (bytes_base + bytes_res) / bps_limit: used to calcuate | |
3581 | * the total time for completing reading/writting all data. | |
3582 | */ | |
3583 | bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
3584 | ||
3585 | if (bytes_base + bytes_res <= bytes_limit) { | |
3586 | if (wait) { | |
3587 | *wait = 0; | |
3588 | } | |
3589 | ||
3590 | return false; | |
3591 | } | |
3592 | ||
3593 | /* Calc approx time to dispatch */ | |
3594 | wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; | |
3595 | ||
3596 | /* When the I/O rate at runtime exceeds the limits, | |
3597 | * bs->slice_end need to be extended in order that the current statistic | |
3598 | * info can be kept until the timer fire, so it is increased and tuned | |
3599 | * based on the result of experiment. | |
3600 | */ | |
ae29d6c6 SH |
3601 | extension = wait_time * NANOSECONDS_PER_SECOND; |
3602 | extension = DIV_ROUND_UP(extension, BLOCK_IO_SLICE_TIME) * | |
3603 | BLOCK_IO_SLICE_TIME; | |
3604 | bs->slice_end += extension; | |
98f90dba | 3605 | if (wait) { |
0775437f | 3606 | *wait = wait_time * NANOSECONDS_PER_SECOND; |
98f90dba ZYW |
3607 | } |
3608 | ||
3609 | return true; | |
3610 | } | |
3611 | ||
3612 | static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, | |
3613 | double elapsed_time, uint64_t *wait) | |
3614 | { | |
3615 | uint64_t iops_limit = 0; | |
3616 | double ios_limit, ios_base; | |
3617 | double slice_time, wait_time; | |
3618 | ||
3619 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { | |
3620 | iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; | |
3621 | } else if (bs->io_limits.iops[is_write]) { | |
3622 | iops_limit = bs->io_limits.iops[is_write]; | |
3623 | } else { | |
3624 | if (wait) { | |
3625 | *wait = 0; | |
3626 | } | |
3627 | ||
3628 | return false; | |
3629 | } | |
3630 | ||
3631 | slice_time = bs->slice_end - bs->slice_start; | |
3632 | slice_time /= (NANOSECONDS_PER_SECOND); | |
3633 | ios_limit = iops_limit * slice_time; | |
5905fbc9 | 3634 | ios_base = bs->slice_submitted.ios[is_write]; |
98f90dba | 3635 | if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) { |
5905fbc9 | 3636 | ios_base += bs->slice_submitted.ios[!is_write]; |
98f90dba ZYW |
3637 | } |
3638 | ||
3639 | if (ios_base + 1 <= ios_limit) { | |
3640 | if (wait) { | |
3641 | *wait = 0; | |
3642 | } | |
3643 | ||
3644 | return false; | |
3645 | } | |
3646 | ||
0775437f | 3647 | /* Calc approx time to dispatch, in seconds */ |
98f90dba ZYW |
3648 | wait_time = (ios_base + 1) / iops_limit; |
3649 | if (wait_time > elapsed_time) { | |
3650 | wait_time = wait_time - elapsed_time; | |
3651 | } else { | |
3652 | wait_time = 0; | |
3653 | } | |
3654 | ||
ae29d6c6 SH |
3655 | /* Exceeded current slice, extend it by another slice time */ |
3656 | bs->slice_end += BLOCK_IO_SLICE_TIME; | |
98f90dba | 3657 | if (wait) { |
0775437f | 3658 | *wait = wait_time * NANOSECONDS_PER_SECOND; |
98f90dba ZYW |
3659 | } |
3660 | ||
3661 | return true; | |
3662 | } | |
3663 | ||
3664 | static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, | |
3665 | bool is_write, int64_t *wait) | |
3666 | { | |
3667 | int64_t now, max_wait; | |
3668 | uint64_t bps_wait = 0, iops_wait = 0; | |
3669 | double elapsed_time; | |
3670 | int bps_ret, iops_ret; | |
3671 | ||
3672 | now = qemu_get_clock_ns(vm_clock); | |
e660fb8b | 3673 | if (now > bs->slice_end) { |
98f90dba | 3674 | bs->slice_start = now; |
ae29d6c6 | 3675 | bs->slice_end = now + BLOCK_IO_SLICE_TIME; |
5905fbc9 | 3676 | memset(&bs->slice_submitted, 0, sizeof(bs->slice_submitted)); |
98f90dba ZYW |
3677 | } |
3678 | ||
3679 | elapsed_time = now - bs->slice_start; | |
3680 | elapsed_time /= (NANOSECONDS_PER_SECOND); | |
3681 | ||
3682 | bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, | |
3683 | is_write, elapsed_time, &bps_wait); | |
3684 | iops_ret = bdrv_exceed_iops_limits(bs, is_write, | |
3685 | elapsed_time, &iops_wait); | |
3686 | if (bps_ret || iops_ret) { | |
3687 | max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; | |
3688 | if (wait) { | |
3689 | *wait = max_wait; | |
3690 | } | |
3691 | ||
3692 | now = qemu_get_clock_ns(vm_clock); | |
3693 | if (bs->slice_end < now + max_wait) { | |
3694 | bs->slice_end = now + max_wait; | |
3695 | } | |
3696 | ||
3697 | return true; | |
3698 | } | |
3699 | ||
3700 | if (wait) { | |
3701 | *wait = 0; | |
3702 | } | |
3703 | ||
5905fbc9 SH |
3704 | bs->slice_submitted.bytes[is_write] += (int64_t)nb_sectors * |
3705 | BDRV_SECTOR_SIZE; | |
3706 | bs->slice_submitted.ios[is_write]++; | |
3707 | ||
98f90dba ZYW |
3708 | return false; |
3709 | } | |
ce1a14dc | 3710 | |
83f64091 FB |
3711 | /**************************************************************/ |
3712 | /* async block device emulation */ | |
3713 | ||
c16b5a2c CH |
3714 | typedef struct BlockDriverAIOCBSync { |
3715 | BlockDriverAIOCB common; | |
3716 | QEMUBH *bh; | |
3717 | int ret; | |
3718 | /* vector translation state */ | |
3719 | QEMUIOVector *qiov; | |
3720 | uint8_t *bounce; | |
3721 | int is_write; | |
3722 | } BlockDriverAIOCBSync; | |
3723 | ||
3724 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
3725 | { | |
b666d239 KW |
3726 | BlockDriverAIOCBSync *acb = |
3727 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 3728 | qemu_bh_delete(acb->bh); |
36afc451 | 3729 | acb->bh = NULL; |
c16b5a2c CH |
3730 | qemu_aio_release(acb); |
3731 | } | |
3732 | ||
d7331bed | 3733 | static const AIOCBInfo bdrv_em_aiocb_info = { |
c16b5a2c CH |
3734 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
3735 | .cancel = bdrv_aio_cancel_em, | |
3736 | }; | |
3737 | ||
ce1a14dc | 3738 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 3739 | { |
ce1a14dc | 3740 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 3741 | |
f141eafe | 3742 | if (!acb->is_write) |
03396148 | 3743 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
ceb42de8 | 3744 | qemu_vfree(acb->bounce); |
ce1a14dc | 3745 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 3746 | qemu_bh_delete(acb->bh); |
36afc451 | 3747 | acb->bh = NULL; |
ce1a14dc | 3748 | qemu_aio_release(acb); |
83f64091 | 3749 | } |
beac80cd | 3750 | |
f141eafe AL |
3751 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
3752 | int64_t sector_num, | |
3753 | QEMUIOVector *qiov, | |
3754 | int nb_sectors, | |
3755 | BlockDriverCompletionFunc *cb, | |
3756 | void *opaque, | |
3757 | int is_write) | |
3758 | ||
83f64091 | 3759 | { |
ce1a14dc | 3760 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 3761 | |
d7331bed | 3762 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
f141eafe AL |
3763 | acb->is_write = is_write; |
3764 | acb->qiov = qiov; | |
e268ca52 | 3765 | acb->bounce = qemu_blockalign(bs, qiov->size); |
3f3aace8 | 3766 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
f141eafe AL |
3767 | |
3768 | if (is_write) { | |
d5e6b161 | 3769 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
1ed20acf | 3770 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe | 3771 | } else { |
1ed20acf | 3772 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
f141eafe AL |
3773 | } |
3774 | ||
ce1a14dc | 3775 | qemu_bh_schedule(acb->bh); |
f141eafe | 3776 | |
ce1a14dc | 3777 | return &acb->common; |
beac80cd FB |
3778 | } |
3779 | ||
f141eafe AL |
3780 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
3781 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 3782 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 3783 | { |
f141eafe AL |
3784 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3785 | } | |
83f64091 | 3786 | |
f141eafe AL |
3787 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
3788 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
3789 | BlockDriverCompletionFunc *cb, void *opaque) | |
3790 | { | |
3791 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 3792 | } |
beac80cd | 3793 | |
68485420 KW |
3794 | |
3795 | typedef struct BlockDriverAIOCBCoroutine { | |
3796 | BlockDriverAIOCB common; | |
3797 | BlockRequest req; | |
3798 | bool is_write; | |
d318aea9 | 3799 | bool *done; |
68485420 KW |
3800 | QEMUBH* bh; |
3801 | } BlockDriverAIOCBCoroutine; | |
3802 | ||
3803 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
3804 | { | |
d318aea9 KW |
3805 | BlockDriverAIOCBCoroutine *acb = |
3806 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); | |
3807 | bool done = false; | |
3808 | ||
3809 | acb->done = &done; | |
3810 | while (!done) { | |
3811 | qemu_aio_wait(); | |
3812 | } | |
68485420 KW |
3813 | } |
3814 | ||
d7331bed | 3815 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
68485420 KW |
3816 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
3817 | .cancel = bdrv_aio_co_cancel_em, | |
3818 | }; | |
3819 | ||
35246a68 | 3820 | static void bdrv_co_em_bh(void *opaque) |
68485420 KW |
3821 | { |
3822 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3823 | ||
3824 | acb->common.cb(acb->common.opaque, acb->req.error); | |
d318aea9 KW |
3825 | |
3826 | if (acb->done) { | |
3827 | *acb->done = true; | |
3828 | } | |
3829 | ||
68485420 KW |
3830 | qemu_bh_delete(acb->bh); |
3831 | qemu_aio_release(acb); | |
3832 | } | |
3833 | ||
b2a61371 SH |
3834 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
3835 | static void coroutine_fn bdrv_co_do_rw(void *opaque) | |
3836 | { | |
3837 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3838 | BlockDriverState *bs = acb->common.bs; | |
3839 | ||
3840 | if (!acb->is_write) { | |
3841 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, | |
470c0504 | 3842 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3843 | } else { |
3844 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, | |
f08f2dda | 3845 | acb->req.nb_sectors, acb->req.qiov, 0); |
b2a61371 SH |
3846 | } |
3847 | ||
35246a68 | 3848 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
b2a61371 SH |
3849 | qemu_bh_schedule(acb->bh); |
3850 | } | |
3851 | ||
68485420 KW |
3852 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
3853 | int64_t sector_num, | |
3854 | QEMUIOVector *qiov, | |
3855 | int nb_sectors, | |
3856 | BlockDriverCompletionFunc *cb, | |
3857 | void *opaque, | |
8c5873d6 | 3858 | bool is_write) |
68485420 KW |
3859 | { |
3860 | Coroutine *co; | |
3861 | BlockDriverAIOCBCoroutine *acb; | |
3862 | ||
d7331bed | 3863 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
68485420 KW |
3864 | acb->req.sector = sector_num; |
3865 | acb->req.nb_sectors = nb_sectors; | |
3866 | acb->req.qiov = qiov; | |
3867 | acb->is_write = is_write; | |
d318aea9 | 3868 | acb->done = NULL; |
68485420 | 3869 | |
8c5873d6 | 3870 | co = qemu_coroutine_create(bdrv_co_do_rw); |
68485420 KW |
3871 | qemu_coroutine_enter(co, acb); |
3872 | ||
3873 | return &acb->common; | |
3874 | } | |
3875 | ||
07f07615 | 3876 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
b2e12bc6 | 3877 | { |
07f07615 PB |
3878 | BlockDriverAIOCBCoroutine *acb = opaque; |
3879 | BlockDriverState *bs = acb->common.bs; | |
b2e12bc6 | 3880 | |
07f07615 PB |
3881 | acb->req.error = bdrv_co_flush(bs); |
3882 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
b2e12bc6 | 3883 | qemu_bh_schedule(acb->bh); |
b2e12bc6 CH |
3884 | } |
3885 | ||
07f07615 | 3886 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
016f5cf6 AG |
3887 | BlockDriverCompletionFunc *cb, void *opaque) |
3888 | { | |
07f07615 | 3889 | trace_bdrv_aio_flush(bs, opaque); |
016f5cf6 | 3890 | |
07f07615 PB |
3891 | Coroutine *co; |
3892 | BlockDriverAIOCBCoroutine *acb; | |
016f5cf6 | 3893 | |
d7331bed | 3894 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
d318aea9 KW |
3895 | acb->done = NULL; |
3896 | ||
07f07615 PB |
3897 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
3898 | qemu_coroutine_enter(co, acb); | |
016f5cf6 | 3899 | |
016f5cf6 AG |
3900 | return &acb->common; |
3901 | } | |
3902 | ||
4265d620 PB |
3903 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3904 | { | |
3905 | BlockDriverAIOCBCoroutine *acb = opaque; | |
3906 | BlockDriverState *bs = acb->common.bs; | |
3907 | ||
3908 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); | |
3909 | acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); | |
3910 | qemu_bh_schedule(acb->bh); | |
3911 | } | |
3912 | ||
3913 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, | |
3914 | int64_t sector_num, int nb_sectors, | |
3915 | BlockDriverCompletionFunc *cb, void *opaque) | |
3916 | { | |
3917 | Coroutine *co; | |
3918 | BlockDriverAIOCBCoroutine *acb; | |
3919 | ||
3920 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); | |
3921 | ||
d7331bed | 3922 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
4265d620 PB |
3923 | acb->req.sector = sector_num; |
3924 | acb->req.nb_sectors = nb_sectors; | |
d318aea9 | 3925 | acb->done = NULL; |
4265d620 PB |
3926 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
3927 | qemu_coroutine_enter(co, acb); | |
3928 | ||
3929 | return &acb->common; | |
3930 | } | |
3931 | ||
ea2384d3 FB |
3932 | void bdrv_init(void) |
3933 | { | |
5efa9d5a | 3934 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 3935 | } |
ce1a14dc | 3936 | |
eb852011 MA |
3937 | void bdrv_init_with_whitelist(void) |
3938 | { | |
3939 | use_bdrv_whitelist = 1; | |
3940 | bdrv_init(); | |
3941 | } | |
3942 | ||
d7331bed | 3943 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
c16b5a2c | 3944 | BlockDriverCompletionFunc *cb, void *opaque) |
ce1a14dc | 3945 | { |
ce1a14dc PB |
3946 | BlockDriverAIOCB *acb; |
3947 | ||
d7331bed SH |
3948 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
3949 | acb->aiocb_info = aiocb_info; | |
ce1a14dc PB |
3950 | acb->bs = bs; |
3951 | acb->cb = cb; | |
3952 | acb->opaque = opaque; | |
3953 | return acb; | |
3954 | } | |
3955 | ||
3956 | void qemu_aio_release(void *p) | |
3957 | { | |
d37c975f | 3958 | BlockDriverAIOCB *acb = p; |
d7331bed | 3959 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
ce1a14dc | 3960 | } |
19cb3738 | 3961 | |
f9f05dc5 KW |
3962 | /**************************************************************/ |
3963 | /* Coroutine block device emulation */ | |
3964 | ||
3965 | typedef struct CoroutineIOCompletion { | |
3966 | Coroutine *coroutine; | |
3967 | int ret; | |
3968 | } CoroutineIOCompletion; | |
3969 | ||
3970 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
3971 | { | |
3972 | CoroutineIOCompletion *co = opaque; | |
3973 | ||
3974 | co->ret = ret; | |
3975 | qemu_coroutine_enter(co->coroutine, NULL); | |
3976 | } | |
3977 | ||
3978 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
3979 | int nb_sectors, QEMUIOVector *iov, | |
3980 | bool is_write) | |
3981 | { | |
3982 | CoroutineIOCompletion co = { | |
3983 | .coroutine = qemu_coroutine_self(), | |
3984 | }; | |
3985 | BlockDriverAIOCB *acb; | |
3986 | ||
3987 | if (is_write) { | |
a652d160 SH |
3988 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3989 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 | 3990 | } else { |
a652d160 SH |
3991 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3992 | bdrv_co_io_em_complete, &co); | |
f9f05dc5 KW |
3993 | } |
3994 | ||
59370aaa | 3995 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
f9f05dc5 KW |
3996 | if (!acb) { |
3997 | return -EIO; | |
3998 | } | |
3999 | qemu_coroutine_yield(); | |
4000 | ||
4001 | return co.ret; | |
4002 | } | |
4003 | ||
4004 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
4005 | int64_t sector_num, int nb_sectors, | |
4006 | QEMUIOVector *iov) | |
4007 | { | |
4008 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
4009 | } | |
4010 | ||
4011 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
4012 | int64_t sector_num, int nb_sectors, | |
4013 | QEMUIOVector *iov) | |
4014 | { | |
4015 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
4016 | } | |
4017 | ||
07f07615 | 4018 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
e7a8a783 | 4019 | { |
07f07615 PB |
4020 | RwCo *rwco = opaque; |
4021 | ||
4022 | rwco->ret = bdrv_co_flush(rwco->bs); | |
4023 | } | |
4024 | ||
4025 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) | |
4026 | { | |
eb489bb1 KW |
4027 | int ret; |
4028 | ||
29cdb251 | 4029 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
07f07615 | 4030 | return 0; |
eb489bb1 KW |
4031 | } |
4032 | ||
ca716364 | 4033 | /* Write back cached data to the OS even with cache=unsafe */ |
bf736fe3 | 4034 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
eb489bb1 KW |
4035 | if (bs->drv->bdrv_co_flush_to_os) { |
4036 | ret = bs->drv->bdrv_co_flush_to_os(bs); | |
4037 | if (ret < 0) { | |
4038 | return ret; | |
4039 | } | |
4040 | } | |
4041 | ||
ca716364 KW |
4042 | /* But don't actually force it to the disk with cache=unsafe */ |
4043 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
d4c82329 | 4044 | goto flush_parent; |
ca716364 KW |
4045 | } |
4046 | ||
bf736fe3 | 4047 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
eb489bb1 | 4048 | if (bs->drv->bdrv_co_flush_to_disk) { |
29cdb251 | 4049 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
07f07615 PB |
4050 | } else if (bs->drv->bdrv_aio_flush) { |
4051 | BlockDriverAIOCB *acb; | |
4052 | CoroutineIOCompletion co = { | |
4053 | .coroutine = qemu_coroutine_self(), | |
4054 | }; | |
4055 | ||
4056 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
4057 | if (acb == NULL) { | |
29cdb251 | 4058 | ret = -EIO; |
07f07615 PB |
4059 | } else { |
4060 | qemu_coroutine_yield(); | |
29cdb251 | 4061 | ret = co.ret; |
07f07615 | 4062 | } |
07f07615 PB |
4063 | } else { |
4064 | /* | |
4065 | * Some block drivers always operate in either writethrough or unsafe | |
4066 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't | |
4067 | * know how the server works (because the behaviour is hardcoded or | |
4068 | * depends on server-side configuration), so we can't ensure that | |
4069 | * everything is safe on disk. Returning an error doesn't work because | |
4070 | * that would break guests even if the server operates in writethrough | |
4071 | * mode. | |
4072 | * | |
4073 | * Let's hope the user knows what he's doing. | |
4074 | */ | |
29cdb251 | 4075 | ret = 0; |
07f07615 | 4076 | } |
29cdb251 PB |
4077 | if (ret < 0) { |
4078 | return ret; | |
4079 | } | |
4080 | ||
4081 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH | |
4082 | * in the case of cache=unsafe, so there are no useless flushes. | |
4083 | */ | |
d4c82329 | 4084 | flush_parent: |
29cdb251 | 4085 | return bdrv_co_flush(bs->file); |
07f07615 PB |
4086 | } |
4087 | ||
0f15423c AL |
4088 | void bdrv_invalidate_cache(BlockDriverState *bs) |
4089 | { | |
4090 | if (bs->drv && bs->drv->bdrv_invalidate_cache) { | |
4091 | bs->drv->bdrv_invalidate_cache(bs); | |
4092 | } | |
4093 | } | |
4094 | ||
4095 | void bdrv_invalidate_cache_all(void) | |
4096 | { | |
4097 | BlockDriverState *bs; | |
4098 | ||
4099 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4100 | bdrv_invalidate_cache(bs); | |
4101 | } | |
4102 | } | |
4103 | ||
07789269 BC |
4104 | void bdrv_clear_incoming_migration_all(void) |
4105 | { | |
4106 | BlockDriverState *bs; | |
4107 | ||
4108 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
4109 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); | |
4110 | } | |
4111 | } | |
4112 | ||
07f07615 PB |
4113 | int bdrv_flush(BlockDriverState *bs) |
4114 | { | |
4115 | Coroutine *co; | |
4116 | RwCo rwco = { | |
4117 | .bs = bs, | |
4118 | .ret = NOT_DONE, | |
e7a8a783 | 4119 | }; |
e7a8a783 | 4120 | |
07f07615 PB |
4121 | if (qemu_in_coroutine()) { |
4122 | /* Fast-path if already in coroutine context */ | |
4123 | bdrv_flush_co_entry(&rwco); | |
4124 | } else { | |
4125 | co = qemu_coroutine_create(bdrv_flush_co_entry); | |
4126 | qemu_coroutine_enter(co, &rwco); | |
4127 | while (rwco.ret == NOT_DONE) { | |
4128 | qemu_aio_wait(); | |
4129 | } | |
e7a8a783 | 4130 | } |
07f07615 PB |
4131 | |
4132 | return rwco.ret; | |
e7a8a783 KW |
4133 | } |
4134 | ||
4265d620 PB |
4135 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
4136 | { | |
4137 | RwCo *rwco = opaque; | |
4138 | ||
4139 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); | |
4140 | } | |
4141 | ||
4142 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, | |
4143 | int nb_sectors) | |
4144 | { | |
4145 | if (!bs->drv) { | |
4146 | return -ENOMEDIUM; | |
4147 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
4148 | return -EIO; | |
4149 | } else if (bs->read_only) { | |
4150 | return -EROFS; | |
df702c9b PB |
4151 | } |
4152 | ||
4153 | if (bs->dirty_bitmap) { | |
8f0720ec | 4154 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
df702c9b PB |
4155 | } |
4156 | ||
9e8f1835 PB |
4157 | /* Do nothing if disabled. */ |
4158 | if (!(bs->open_flags & BDRV_O_UNMAP)) { | |
4159 | return 0; | |
4160 | } | |
4161 | ||
df702c9b | 4162 | if (bs->drv->bdrv_co_discard) { |
4265d620 PB |
4163 | return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors); |
4164 | } else if (bs->drv->bdrv_aio_discard) { | |
4165 | BlockDriverAIOCB *acb; | |
4166 | CoroutineIOCompletion co = { | |
4167 | .coroutine = qemu_coroutine_self(), | |
4168 | }; | |
4169 | ||
4170 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, | |
4171 | bdrv_co_io_em_complete, &co); | |
4172 | if (acb == NULL) { | |
4173 | return -EIO; | |
4174 | } else { | |
4175 | qemu_coroutine_yield(); | |
4176 | return co.ret; | |
4177 | } | |
4265d620 PB |
4178 | } else { |
4179 | return 0; | |
4180 | } | |
4181 | } | |
4182 | ||
4183 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
4184 | { | |
4185 | Coroutine *co; | |
4186 | RwCo rwco = { | |
4187 | .bs = bs, | |
4188 | .sector_num = sector_num, | |
4189 | .nb_sectors = nb_sectors, | |
4190 | .ret = NOT_DONE, | |
4191 | }; | |
4192 | ||
4193 | if (qemu_in_coroutine()) { | |
4194 | /* Fast-path if already in coroutine context */ | |
4195 | bdrv_discard_co_entry(&rwco); | |
4196 | } else { | |
4197 | co = qemu_coroutine_create(bdrv_discard_co_entry); | |
4198 | qemu_coroutine_enter(co, &rwco); | |
4199 | while (rwco.ret == NOT_DONE) { | |
4200 | qemu_aio_wait(); | |
4201 | } | |
4202 | } | |
4203 | ||
4204 | return rwco.ret; | |
4205 | } | |
4206 | ||
19cb3738 FB |
4207 | /**************************************************************/ |
4208 | /* removable device support */ | |
4209 | ||
4210 | /** | |
4211 | * Return TRUE if the media is present | |
4212 | */ | |
4213 | int bdrv_is_inserted(BlockDriverState *bs) | |
4214 | { | |
4215 | BlockDriver *drv = bs->drv; | |
a1aff5bf | 4216 | |
19cb3738 FB |
4217 | if (!drv) |
4218 | return 0; | |
4219 | if (!drv->bdrv_is_inserted) | |
a1aff5bf MA |
4220 | return 1; |
4221 | return drv->bdrv_is_inserted(bs); | |
19cb3738 FB |
4222 | } |
4223 | ||
4224 | /** | |
8e49ca46 MA |
4225 | * Return whether the media changed since the last call to this |
4226 | * function, or -ENOTSUP if we don't know. Most drivers don't know. | |
19cb3738 FB |
4227 | */ |
4228 | int bdrv_media_changed(BlockDriverState *bs) | |
4229 | { | |
4230 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4231 | |
8e49ca46 MA |
4232 | if (drv && drv->bdrv_media_changed) { |
4233 | return drv->bdrv_media_changed(bs); | |
4234 | } | |
4235 | return -ENOTSUP; | |
19cb3738 FB |
4236 | } |
4237 | ||
4238 | /** | |
4239 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
4240 | */ | |
f36f3949 | 4241 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
19cb3738 FB |
4242 | { |
4243 | BlockDriver *drv = bs->drv; | |
19cb3738 | 4244 | |
822e1cd1 MA |
4245 | if (drv && drv->bdrv_eject) { |
4246 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 4247 | } |
6f382ed2 LC |
4248 | |
4249 | if (bs->device_name[0] != '\0') { | |
4250 | bdrv_emit_qmp_eject_event(bs, eject_flag); | |
4251 | } | |
19cb3738 FB |
4252 | } |
4253 | ||
19cb3738 FB |
4254 | /** |
4255 | * Lock or unlock the media (if it is locked, the user won't be able | |
4256 | * to eject it manually). | |
4257 | */ | |
025e849a | 4258 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
19cb3738 FB |
4259 | { |
4260 | BlockDriver *drv = bs->drv; | |
4261 | ||
025e849a | 4262 | trace_bdrv_lock_medium(bs, locked); |
b8c6d095 | 4263 | |
025e849a MA |
4264 | if (drv && drv->bdrv_lock_medium) { |
4265 | drv->bdrv_lock_medium(bs, locked); | |
19cb3738 FB |
4266 | } |
4267 | } | |
985a03b0 TS |
4268 | |
4269 | /* needed for generic scsi interface */ | |
4270 | ||
4271 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
4272 | { | |
4273 | BlockDriver *drv = bs->drv; | |
4274 | ||
4275 | if (drv && drv->bdrv_ioctl) | |
4276 | return drv->bdrv_ioctl(bs, req, buf); | |
4277 | return -ENOTSUP; | |
4278 | } | |
7d780669 | 4279 | |
221f715d AL |
4280 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
4281 | unsigned long int req, void *buf, | |
4282 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 4283 | { |
221f715d | 4284 | BlockDriver *drv = bs->drv; |
7d780669 | 4285 | |
221f715d AL |
4286 | if (drv && drv->bdrv_aio_ioctl) |
4287 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
4288 | return NULL; | |
7d780669 | 4289 | } |
e268ca52 | 4290 | |
7b6f9300 MA |
4291 | void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
4292 | { | |
4293 | bs->buffer_alignment = align; | |
4294 | } | |
7cd1e32a | 4295 | |
e268ca52 AL |
4296 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
4297 | { | |
4298 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
4299 | } | |
7cd1e32a | 4300 | |
c53b1c51 SH |
4301 | /* |
4302 | * Check if all memory in this vector is sector aligned. | |
4303 | */ | |
4304 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) | |
4305 | { | |
4306 | int i; | |
4307 | ||
4308 | for (i = 0; i < qiov->niov; i++) { | |
4309 | if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) { | |
4310 | return false; | |
4311 | } | |
4312 | } | |
4313 | ||
4314 | return true; | |
4315 | } | |
4316 | ||
50717e94 | 4317 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int granularity) |
7cd1e32a | 4318 | { |
4319 | int64_t bitmap_size; | |
a55eb92c | 4320 | |
50717e94 PB |
4321 | assert((granularity & (granularity - 1)) == 0); |
4322 | ||
4323 | if (granularity) { | |
4324 | granularity >>= BDRV_SECTOR_BITS; | |
4325 | assert(!bs->dirty_bitmap); | |
4326 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); | |
4327 | bs->dirty_bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); | |
7cd1e32a | 4328 | } else { |
c6d22830 | 4329 | if (bs->dirty_bitmap) { |
8f0720ec | 4330 | hbitmap_free(bs->dirty_bitmap); |
c6d22830 | 4331 | bs->dirty_bitmap = NULL; |
a55eb92c | 4332 | } |
7cd1e32a | 4333 | } |
4334 | } | |
4335 | ||
4336 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
4337 | { | |
8f0720ec PB |
4338 | if (bs->dirty_bitmap) { |
4339 | return hbitmap_get(bs->dirty_bitmap, sector); | |
7cd1e32a | 4340 | } else { |
4341 | return 0; | |
4342 | } | |
4343 | } | |
4344 | ||
8f0720ec | 4345 | void bdrv_dirty_iter_init(BlockDriverState *bs, HBitmapIter *hbi) |
1755da16 | 4346 | { |
8f0720ec | 4347 | hbitmap_iter_init(hbi, bs->dirty_bitmap, 0); |
1755da16 PB |
4348 | } |
4349 | ||
4350 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, | |
4351 | int nr_sectors) | |
4352 | { | |
8f0720ec | 4353 | hbitmap_set(bs->dirty_bitmap, cur_sector, nr_sectors); |
1755da16 PB |
4354 | } |
4355 | ||
a55eb92c JK |
4356 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
4357 | int nr_sectors) | |
7cd1e32a | 4358 | { |
8f0720ec | 4359 | hbitmap_reset(bs->dirty_bitmap, cur_sector, nr_sectors); |
7cd1e32a | 4360 | } |
aaa0eb75 LS |
4361 | |
4362 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
4363 | { | |
8f0720ec | 4364 | if (bs->dirty_bitmap) { |
acc906c6 | 4365 | return hbitmap_count(bs->dirty_bitmap); |
8f0720ec PB |
4366 | } else { |
4367 | return 0; | |
4368 | } | |
aaa0eb75 | 4369 | } |
f88e1a42 | 4370 | |
db593f25 MT |
4371 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
4372 | { | |
4373 | assert(bs->in_use != in_use); | |
4374 | bs->in_use = in_use; | |
4375 | } | |
4376 | ||
4377 | int bdrv_in_use(BlockDriverState *bs) | |
4378 | { | |
4379 | return bs->in_use; | |
4380 | } | |
4381 | ||
28a7282a LC |
4382 | void bdrv_iostatus_enable(BlockDriverState *bs) |
4383 | { | |
d6bf279e | 4384 | bs->iostatus_enabled = true; |
58e21ef5 | 4385 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
28a7282a LC |
4386 | } |
4387 | ||
4388 | /* The I/O status is only enabled if the drive explicitly | |
4389 | * enables it _and_ the VM is configured to stop on errors */ | |
4390 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) | |
4391 | { | |
d6bf279e | 4392 | return (bs->iostatus_enabled && |
92aa5c6d PB |
4393 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
4394 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || | |
4395 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); | |
28a7282a LC |
4396 | } |
4397 | ||
4398 | void bdrv_iostatus_disable(BlockDriverState *bs) | |
4399 | { | |
d6bf279e | 4400 | bs->iostatus_enabled = false; |
28a7282a LC |
4401 | } |
4402 | ||
4403 | void bdrv_iostatus_reset(BlockDriverState *bs) | |
4404 | { | |
4405 | if (bdrv_iostatus_is_enabled(bs)) { | |
58e21ef5 | 4406 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3bd293c3 PB |
4407 | if (bs->job) { |
4408 | block_job_iostatus_reset(bs->job); | |
4409 | } | |
28a7282a LC |
4410 | } |
4411 | } | |
4412 | ||
28a7282a LC |
4413 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
4414 | { | |
3e1caa5f PB |
4415 | assert(bdrv_iostatus_is_enabled(bs)); |
4416 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { | |
58e21ef5 LC |
4417 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
4418 | BLOCK_DEVICE_IO_STATUS_FAILED; | |
28a7282a LC |
4419 | } |
4420 | } | |
4421 | ||
a597e79c CH |
4422 | void |
4423 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
4424 | enum BlockAcctType type) | |
4425 | { | |
4426 | assert(type < BDRV_MAX_IOTYPE); | |
4427 | ||
4428 | cookie->bytes = bytes; | |
c488c7f6 | 4429 | cookie->start_time_ns = get_clock(); |
a597e79c CH |
4430 | cookie->type = type; |
4431 | } | |
4432 | ||
4433 | void | |
4434 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
4435 | { | |
4436 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
4437 | ||
4438 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
4439 | bs->nr_ops[cookie->type]++; | |
c488c7f6 | 4440 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
a597e79c CH |
4441 | } |
4442 | ||
d92ada22 LC |
4443 | void bdrv_img_create(const char *filename, const char *fmt, |
4444 | const char *base_filename, const char *base_fmt, | |
f382d43a MR |
4445 | char *options, uint64_t img_size, int flags, |
4446 | Error **errp, bool quiet) | |
f88e1a42 JS |
4447 | { |
4448 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 4449 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
4450 | BlockDriverState *bs = NULL; |
4451 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 4452 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
4453 | int ret = 0; |
4454 | ||
4455 | /* Find driver and parse its options */ | |
4456 | drv = bdrv_find_format(fmt); | |
4457 | if (!drv) { | |
71c79813 | 4458 | error_setg(errp, "Unknown file format '%s'", fmt); |
d92ada22 | 4459 | return; |
f88e1a42 JS |
4460 | } |
4461 | ||
98289620 | 4462 | proto_drv = bdrv_find_protocol(filename, true); |
f88e1a42 | 4463 | if (!proto_drv) { |
71c79813 | 4464 | error_setg(errp, "Unknown protocol '%s'", filename); |
d92ada22 | 4465 | return; |
f88e1a42 JS |
4466 | } |
4467 | ||
4468 | create_options = append_option_parameters(create_options, | |
4469 | drv->create_options); | |
4470 | create_options = append_option_parameters(create_options, | |
4471 | proto_drv->create_options); | |
4472 | ||
4473 | /* Create parameter list with default values */ | |
4474 | param = parse_option_parameters("", create_options, param); | |
4475 | ||
4476 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
4477 | ||
4478 | /* Parse -o options */ | |
4479 | if (options) { | |
4480 | param = parse_option_parameters(options, create_options, param); | |
4481 | if (param == NULL) { | |
71c79813 | 4482 | error_setg(errp, "Invalid options for file format '%s'.", fmt); |
f88e1a42 JS |
4483 | goto out; |
4484 | } | |
4485 | } | |
4486 | ||
4487 | if (base_filename) { | |
4488 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
4489 | base_filename)) { | |
71c79813 LC |
4490 | error_setg(errp, "Backing file not supported for file format '%s'", |
4491 | fmt); | |
f88e1a42 JS |
4492 | goto out; |
4493 | } | |
4494 | } | |
4495 | ||
4496 | if (base_fmt) { | |
4497 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
71c79813 LC |
4498 | error_setg(errp, "Backing file format not supported for file " |
4499 | "format '%s'", fmt); | |
f88e1a42 JS |
4500 | goto out; |
4501 | } | |
4502 | } | |
4503 | ||
792da93a JS |
4504 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
4505 | if (backing_file && backing_file->value.s) { | |
4506 | if (!strcmp(filename, backing_file->value.s)) { | |
71c79813 LC |
4507 | error_setg(errp, "Error: Trying to create an image with the " |
4508 | "same filename as the backing file"); | |
792da93a JS |
4509 | goto out; |
4510 | } | |
4511 | } | |
4512 | ||
f88e1a42 JS |
4513 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
4514 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
4515 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
4516 | if (!backing_drv) { | |
71c79813 LC |
4517 | error_setg(errp, "Unknown backing file format '%s'", |
4518 | backing_fmt->value.s); | |
f88e1a42 JS |
4519 | goto out; |
4520 | } | |
4521 | } | |
4522 | ||
4523 | // The size for the image must always be specified, with one exception: | |
4524 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
4525 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
4526 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
4527 | if (backing_file && backing_file->value.s) { |
4528 | uint64_t size; | |
f88e1a42 | 4529 | char buf[32]; |
63090dac PB |
4530 | int back_flags; |
4531 | ||
4532 | /* backing files always opened read-only */ | |
4533 | back_flags = | |
4534 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
f88e1a42 | 4535 | |
f88e1a42 JS |
4536 | bs = bdrv_new(""); |
4537 | ||
de9c0cec KW |
4538 | ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags, |
4539 | backing_drv); | |
f88e1a42 | 4540 | if (ret < 0) { |
71c79813 LC |
4541 | error_setg_errno(errp, -ret, "Could not open '%s'", |
4542 | backing_file->value.s); | |
f88e1a42 JS |
4543 | goto out; |
4544 | } | |
4545 | bdrv_get_geometry(bs, &size); | |
4546 | size *= 512; | |
4547 | ||
4548 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
4549 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
4550 | } else { | |
71c79813 | 4551 | error_setg(errp, "Image creation needs a size parameter"); |
f88e1a42 JS |
4552 | goto out; |
4553 | } | |
4554 | } | |
4555 | ||
f382d43a MR |
4556 | if (!quiet) { |
4557 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
4558 | print_option_parameters(param); | |
4559 | puts(""); | |
4560 | } | |
f88e1a42 | 4561 | ret = bdrv_create(drv, filename, param); |
f88e1a42 JS |
4562 | if (ret < 0) { |
4563 | if (ret == -ENOTSUP) { | |
71c79813 LC |
4564 | error_setg(errp,"Formatting or formatting option not supported for " |
4565 | "file format '%s'", fmt); | |
f88e1a42 | 4566 | } else if (ret == -EFBIG) { |
f3f4d2c0 KW |
4567 | const char *cluster_size_hint = ""; |
4568 | if (get_option_parameter(create_options, BLOCK_OPT_CLUSTER_SIZE)) { | |
4569 | cluster_size_hint = " (try using a larger cluster size)"; | |
4570 | } | |
4571 | error_setg(errp, "The image size is too large for file format '%s'%s", | |
4572 | fmt, cluster_size_hint); | |
f88e1a42 | 4573 | } else { |
71c79813 LC |
4574 | error_setg(errp, "%s: error while creating %s: %s", filename, fmt, |
4575 | strerror(-ret)); | |
f88e1a42 JS |
4576 | } |
4577 | } | |
4578 | ||
4579 | out: | |
4580 | free_option_parameters(create_options); | |
4581 | free_option_parameters(param); | |
4582 | ||
4583 | if (bs) { | |
4584 | bdrv_delete(bs); | |
4585 | } | |
f88e1a42 | 4586 | } |
85d126f3 SH |
4587 | |
4588 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) | |
4589 | { | |
4590 | /* Currently BlockDriverState always uses the main loop AioContext */ | |
4591 | return qemu_get_aio_context(); | |
4592 | } | |
d616b224 SH |
4593 | |
4594 | void bdrv_add_before_write_notifier(BlockDriverState *bs, | |
4595 | NotifierWithReturn *notifier) | |
4596 | { | |
4597 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); | |
4598 | } |