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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" |
376253ec | 26 | #include "monitor.h" |
ea2384d3 | 27 | #include "block_int.h" |
5efa9d5a | 28 | #include "module.h" |
d15e5465 | 29 | #include "qemu-objects.h" |
fc01f7e7 | 30 | |
71e72a19 | 31 | #ifdef CONFIG_BSD |
7674e7bf FB |
32 | #include <sys/types.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
72cf2d4f | 35 | #include <sys/queue.h> |
c5e97233 | 36 | #ifndef __DragonFly__ |
7674e7bf FB |
37 | #include <sys/disk.h> |
38 | #endif | |
c5e97233 | 39 | #endif |
7674e7bf | 40 | |
49dc768d AL |
41 | #ifdef _WIN32 |
42 | #include <windows.h> | |
43 | #endif | |
44 | ||
f141eafe AL |
45 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
46 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 47 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
48 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 50 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
51 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
52 | BlockDriverCompletionFunc *cb, void *opaque); | |
016f5cf6 AG |
53 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
54 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 55 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
56 | uint8_t *buf, int nb_sectors); |
57 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
58 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 59 | |
1b7bdbc1 SH |
60 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
61 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 62 | |
8a22f02a SH |
63 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
64 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 65 | |
eb852011 MA |
66 | /* If non-zero, use only whitelisted block drivers */ |
67 | static int use_bdrv_whitelist; | |
68 | ||
83f64091 | 69 | int path_is_absolute(const char *path) |
3b0d4f61 | 70 | { |
83f64091 | 71 | const char *p; |
21664424 FB |
72 | #ifdef _WIN32 |
73 | /* specific case for names like: "\\.\d:" */ | |
74 | if (*path == '/' || *path == '\\') | |
75 | return 1; | |
76 | #endif | |
83f64091 FB |
77 | p = strchr(path, ':'); |
78 | if (p) | |
79 | p++; | |
80 | else | |
81 | p = path; | |
3b9f94e1 FB |
82 | #ifdef _WIN32 |
83 | return (*p == '/' || *p == '\\'); | |
84 | #else | |
85 | return (*p == '/'); | |
86 | #endif | |
3b0d4f61 FB |
87 | } |
88 | ||
83f64091 FB |
89 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
90 | path to it by considering it is relative to base_path. URL are | |
91 | supported. */ | |
92 | void path_combine(char *dest, int dest_size, | |
93 | const char *base_path, | |
94 | const char *filename) | |
3b0d4f61 | 95 | { |
83f64091 FB |
96 | const char *p, *p1; |
97 | int len; | |
98 | ||
99 | if (dest_size <= 0) | |
100 | return; | |
101 | if (path_is_absolute(filename)) { | |
102 | pstrcpy(dest, dest_size, filename); | |
103 | } else { | |
104 | p = strchr(base_path, ':'); | |
105 | if (p) | |
106 | p++; | |
107 | else | |
108 | p = base_path; | |
3b9f94e1 FB |
109 | p1 = strrchr(base_path, '/'); |
110 | #ifdef _WIN32 | |
111 | { | |
112 | const char *p2; | |
113 | p2 = strrchr(base_path, '\\'); | |
114 | if (!p1 || p2 > p1) | |
115 | p1 = p2; | |
116 | } | |
117 | #endif | |
83f64091 FB |
118 | if (p1) |
119 | p1++; | |
120 | else | |
121 | p1 = base_path; | |
122 | if (p1 > p) | |
123 | p = p1; | |
124 | len = p - base_path; | |
125 | if (len > dest_size - 1) | |
126 | len = dest_size - 1; | |
127 | memcpy(dest, base_path, len); | |
128 | dest[len] = '\0'; | |
129 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 130 | } |
3b0d4f61 FB |
131 | } |
132 | ||
5efa9d5a | 133 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 134 | { |
f141eafe | 135 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 136 | /* add AIO emulation layer */ |
f141eafe AL |
137 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
138 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 139 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
140 | /* add synchronous IO emulation layer */ |
141 | bdrv->bdrv_read = bdrv_read_em; | |
142 | bdrv->bdrv_write = bdrv_write_em; | |
143 | } | |
b2e12bc6 CH |
144 | |
145 | if (!bdrv->bdrv_aio_flush) | |
146 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
147 | ||
8a22f02a | 148 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 149 | } |
b338082b FB |
150 | |
151 | /* create a new block device (by default it is empty) */ | |
152 | BlockDriverState *bdrv_new(const char *device_name) | |
153 | { | |
1b7bdbc1 | 154 | BlockDriverState *bs; |
b338082b FB |
155 | |
156 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 157 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 158 | if (device_name[0] != '\0') { |
1b7bdbc1 | 159 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 160 | } |
b338082b FB |
161 | return bs; |
162 | } | |
163 | ||
ea2384d3 FB |
164 | BlockDriver *bdrv_find_format(const char *format_name) |
165 | { | |
166 | BlockDriver *drv1; | |
8a22f02a SH |
167 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
168 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 169 | return drv1; |
8a22f02a | 170 | } |
ea2384d3 FB |
171 | } |
172 | return NULL; | |
173 | } | |
174 | ||
eb852011 MA |
175 | static int bdrv_is_whitelisted(BlockDriver *drv) |
176 | { | |
177 | static const char *whitelist[] = { | |
178 | CONFIG_BDRV_WHITELIST | |
179 | }; | |
180 | const char **p; | |
181 | ||
182 | if (!whitelist[0]) | |
183 | return 1; /* no whitelist, anything goes */ | |
184 | ||
185 | for (p = whitelist; *p; p++) { | |
186 | if (!strcmp(drv->format_name, *p)) { | |
187 | return 1; | |
188 | } | |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
194 | { | |
195 | BlockDriver *drv = bdrv_find_format(format_name); | |
196 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
197 | } | |
198 | ||
0e7e1989 KW |
199 | int bdrv_create(BlockDriver *drv, const char* filename, |
200 | QEMUOptionParameter *options) | |
ea2384d3 FB |
201 | { |
202 | if (!drv->bdrv_create) | |
203 | return -ENOTSUP; | |
0e7e1989 KW |
204 | |
205 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
206 | } |
207 | ||
84a12e66 CH |
208 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
209 | { | |
210 | BlockDriver *drv; | |
211 | ||
b50cbabc | 212 | drv = bdrv_find_protocol(filename); |
84a12e66 CH |
213 | if (drv == NULL) { |
214 | drv = bdrv_find_format("file"); | |
215 | } | |
216 | ||
217 | return bdrv_create(drv, filename, options); | |
218 | } | |
219 | ||
d5249393 | 220 | #ifdef _WIN32 |
95389c86 | 221 | void get_tmp_filename(char *filename, int size) |
d5249393 | 222 | { |
3b9f94e1 | 223 | char temp_dir[MAX_PATH]; |
3b46e624 | 224 | |
3b9f94e1 FB |
225 | GetTempPath(MAX_PATH, temp_dir); |
226 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
227 | } |
228 | #else | |
95389c86 | 229 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 230 | { |
67b915a5 | 231 | int fd; |
7ccfb2eb | 232 | const char *tmpdir; |
d5249393 | 233 | /* XXX: race condition possible */ |
0badc1ee AJ |
234 | tmpdir = getenv("TMPDIR"); |
235 | if (!tmpdir) | |
236 | tmpdir = "/tmp"; | |
237 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
238 | fd = mkstemp(filename); |
239 | close(fd); | |
240 | } | |
d5249393 | 241 | #endif |
fc01f7e7 | 242 | |
19cb3738 | 243 | #ifdef _WIN32 |
f45512fe FB |
244 | static int is_windows_drive_prefix(const char *filename) |
245 | { | |
246 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
247 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
248 | filename[1] == ':'); | |
249 | } | |
3b46e624 | 250 | |
508c7cb3 | 251 | int is_windows_drive(const char *filename) |
19cb3738 | 252 | { |
5fafdf24 | 253 | if (is_windows_drive_prefix(filename) && |
f45512fe | 254 | filename[2] == '\0') |
19cb3738 FB |
255 | return 1; |
256 | if (strstart(filename, "\\\\.\\", NULL) || | |
257 | strstart(filename, "//./", NULL)) | |
258 | return 1; | |
259 | return 0; | |
260 | } | |
261 | #endif | |
262 | ||
84a12e66 CH |
263 | /* |
264 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
265 | * recognized as a host CDROM. | |
266 | */ | |
267 | static BlockDriver *find_hdev_driver(const char *filename) | |
268 | { | |
269 | int score_max = 0, score; | |
270 | BlockDriver *drv = NULL, *d; | |
271 | ||
272 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
273 | if (d->bdrv_probe_device) { | |
274 | score = d->bdrv_probe_device(filename); | |
275 | if (score > score_max) { | |
276 | score_max = score; | |
277 | drv = d; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | return drv; | |
283 | } | |
284 | ||
b50cbabc | 285 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
286 | { |
287 | BlockDriver *drv1; | |
288 | char protocol[128]; | |
1cec71e3 | 289 | int len; |
83f64091 | 290 | const char *p; |
19cb3738 | 291 | |
66f82cee KW |
292 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
293 | ||
39508e7a CH |
294 | /* |
295 | * XXX(hch): we really should not let host device detection | |
296 | * override an explicit protocol specification, but moving this | |
297 | * later breaks access to device names with colons in them. | |
298 | * Thanks to the brain-dead persistent naming schemes on udev- | |
299 | * based Linux systems those actually are quite common. | |
300 | */ | |
301 | drv1 = find_hdev_driver(filename); | |
302 | if (drv1) { | |
303 | return drv1; | |
304 | } | |
305 | ||
19cb3738 | 306 | #ifdef _WIN32 |
39508e7a CH |
307 | if (is_windows_drive(filename) || |
308 | is_windows_drive_prefix(filename)) | |
309 | return bdrv_find_format("file"); | |
19cb3738 | 310 | #endif |
39508e7a | 311 | |
1cec71e3 | 312 | p = strchr(filename, ':'); |
39508e7a CH |
313 | if (!p) { |
314 | return bdrv_find_format("file"); | |
84a12e66 | 315 | } |
1cec71e3 AL |
316 | len = p - filename; |
317 | if (len > sizeof(protocol) - 1) | |
318 | len = sizeof(protocol) - 1; | |
319 | memcpy(protocol, filename, len); | |
320 | protocol[len] = '\0'; | |
8a22f02a | 321 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 322 | if (drv1->protocol_name && |
8a22f02a | 323 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 324 | return drv1; |
8a22f02a | 325 | } |
83f64091 FB |
326 | } |
327 | return NULL; | |
328 | } | |
329 | ||
f3a5d3f8 CH |
330 | static BlockDriver *find_image_format(const char *filename) |
331 | { | |
332 | int ret, score, score_max; | |
333 | BlockDriver *drv1, *drv; | |
334 | uint8_t buf[2048]; | |
335 | BlockDriverState *bs; | |
336 | ||
f5edb014 | 337 | ret = bdrv_file_open(&bs, filename, 0); |
83f64091 FB |
338 | if (ret < 0) |
339 | return NULL; | |
f8ea0b00 | 340 | |
08a00559 KW |
341 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
342 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 343 | bdrv_delete(bs); |
f8ea0b00 | 344 | return bdrv_find_format("raw"); |
1a396859 | 345 | } |
f8ea0b00 | 346 | |
83f64091 FB |
347 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
348 | bdrv_delete(bs); | |
349 | if (ret < 0) { | |
350 | return NULL; | |
351 | } | |
352 | ||
ea2384d3 | 353 | score_max = 0; |
84a12e66 | 354 | drv = NULL; |
8a22f02a | 355 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
356 | if (drv1->bdrv_probe) { |
357 | score = drv1->bdrv_probe(buf, ret, filename); | |
358 | if (score > score_max) { | |
359 | score_max = score; | |
360 | drv = drv1; | |
361 | } | |
0849bf08 | 362 | } |
fc01f7e7 | 363 | } |
ea2384d3 FB |
364 | return drv; |
365 | } | |
366 | ||
51762288 SH |
367 | /** |
368 | * Set the current 'total_sectors' value | |
369 | */ | |
370 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
371 | { | |
372 | BlockDriver *drv = bs->drv; | |
373 | ||
396759ad NB |
374 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
375 | if (bs->sg) | |
376 | return 0; | |
377 | ||
51762288 SH |
378 | /* query actual device if possible, otherwise just trust the hint */ |
379 | if (drv->bdrv_getlength) { | |
380 | int64_t length = drv->bdrv_getlength(bs); | |
381 | if (length < 0) { | |
382 | return length; | |
383 | } | |
384 | hint = length >> BDRV_SECTOR_BITS; | |
385 | } | |
386 | ||
387 | bs->total_sectors = hint; | |
388 | return 0; | |
389 | } | |
390 | ||
57915332 KW |
391 | /* |
392 | * Common part for opening disk images and files | |
393 | */ | |
394 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
395 | int flags, BlockDriver *drv) | |
396 | { | |
397 | int ret, open_flags; | |
398 | ||
399 | assert(drv != NULL); | |
400 | ||
66f82cee | 401 | bs->file = NULL; |
51762288 | 402 | bs->total_sectors = 0; |
57915332 KW |
403 | bs->encrypted = 0; |
404 | bs->valid_key = 0; | |
405 | bs->open_flags = flags; | |
406 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
407 | bs->buffer_alignment = 512; | |
408 | ||
409 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
410 | ||
411 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
412 | return -ENOTSUP; | |
413 | } | |
414 | ||
415 | bs->drv = drv; | |
416 | bs->opaque = qemu_mallocz(drv->instance_size); | |
417 | ||
418 | /* | |
419 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
420 | * write cache to the guest. We do need the fdatasync to flush | |
421 | * out transactions for block allocations, and we maybe have a | |
422 | * volatile write cache in our backing device to deal with. | |
423 | */ | |
424 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
425 | bs->enable_write_cache = 1; | |
426 | ||
427 | /* | |
428 | * Clear flags that are internal to the block layer before opening the | |
429 | * image. | |
430 | */ | |
431 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
432 | ||
433 | /* | |
434 | * Snapshots should be writeable. | |
435 | */ | |
436 | if (bs->is_temporary) { | |
437 | open_flags |= BDRV_O_RDWR; | |
438 | } | |
439 | ||
66f82cee KW |
440 | /* Open the image, either directly or using a protocol */ |
441 | if (drv->bdrv_file_open) { | |
442 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
443 | } else { | |
444 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
445 | if (ret >= 0) { | |
446 | ret = drv->bdrv_open(bs, open_flags); | |
447 | } | |
448 | } | |
449 | ||
57915332 KW |
450 | if (ret < 0) { |
451 | goto free_and_fail; | |
452 | } | |
453 | ||
454 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
455 | |
456 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
457 | if (ret < 0) { | |
458 | goto free_and_fail; | |
57915332 | 459 | } |
51762288 | 460 | |
57915332 KW |
461 | #ifndef _WIN32 |
462 | if (bs->is_temporary) { | |
463 | unlink(filename); | |
464 | } | |
465 | #endif | |
466 | return 0; | |
467 | ||
468 | free_and_fail: | |
66f82cee KW |
469 | if (bs->file) { |
470 | bdrv_delete(bs->file); | |
471 | bs->file = NULL; | |
472 | } | |
57915332 KW |
473 | qemu_free(bs->opaque); |
474 | bs->opaque = NULL; | |
475 | bs->drv = NULL; | |
476 | return ret; | |
477 | } | |
478 | ||
b6ce07aa KW |
479 | /* |
480 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
481 | */ | |
83f64091 | 482 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 483 | { |
83f64091 | 484 | BlockDriverState *bs; |
6db95603 | 485 | BlockDriver *drv; |
83f64091 FB |
486 | int ret; |
487 | ||
b50cbabc | 488 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
489 | if (!drv) { |
490 | return -ENOENT; | |
491 | } | |
492 | ||
83f64091 | 493 | bs = bdrv_new(""); |
b6ce07aa | 494 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
495 | if (ret < 0) { |
496 | bdrv_delete(bs); | |
497 | return ret; | |
3b0d4f61 | 498 | } |
71d0770c | 499 | bs->growable = 1; |
83f64091 FB |
500 | *pbs = bs; |
501 | return 0; | |
502 | } | |
503 | ||
b6ce07aa KW |
504 | /* |
505 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
506 | */ | |
d6e9098e KW |
507 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
508 | BlockDriver *drv) | |
ea2384d3 | 509 | { |
b6ce07aa | 510 | int ret; |
712e7874 | 511 | |
83f64091 | 512 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
513 | BlockDriverState *bs1; |
514 | int64_t total_size; | |
7c96d46e | 515 | int is_protocol = 0; |
91a073a9 KW |
516 | BlockDriver *bdrv_qcow2; |
517 | QEMUOptionParameter *options; | |
b6ce07aa KW |
518 | char tmp_filename[PATH_MAX]; |
519 | char backing_filename[PATH_MAX]; | |
3b46e624 | 520 | |
ea2384d3 FB |
521 | /* if snapshot, we create a temporary backing file and open it |
522 | instead of opening 'filename' directly */ | |
33e3963e | 523 | |
ea2384d3 FB |
524 | /* if there is a backing file, use it */ |
525 | bs1 = bdrv_new(""); | |
d6e9098e | 526 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 527 | if (ret < 0) { |
ea2384d3 | 528 | bdrv_delete(bs1); |
51d7c00c | 529 | return ret; |
ea2384d3 | 530 | } |
3e82990b | 531 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
532 | |
533 | if (bs1->drv && bs1->drv->protocol_name) | |
534 | is_protocol = 1; | |
535 | ||
ea2384d3 | 536 | bdrv_delete(bs1); |
3b46e624 | 537 | |
ea2384d3 | 538 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
539 | |
540 | /* Real path is meaningless for protocols */ | |
541 | if (is_protocol) | |
542 | snprintf(backing_filename, sizeof(backing_filename), | |
543 | "%s", filename); | |
114cdfa9 KS |
544 | else if (!realpath(filename, backing_filename)) |
545 | return -errno; | |
7c96d46e | 546 | |
91a073a9 KW |
547 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
548 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
549 | ||
3e82990b | 550 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
551 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
552 | if (drv) { | |
553 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
554 | drv->format_name); | |
555 | } | |
556 | ||
557 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 558 | free_option_parameters(options); |
51d7c00c AL |
559 | if (ret < 0) { |
560 | return ret; | |
ea2384d3 | 561 | } |
91a073a9 | 562 | |
ea2384d3 | 563 | filename = tmp_filename; |
91a073a9 | 564 | drv = bdrv_qcow2; |
ea2384d3 FB |
565 | bs->is_temporary = 1; |
566 | } | |
712e7874 | 567 | |
b6ce07aa | 568 | /* Find the right image format driver */ |
6db95603 | 569 | if (!drv) { |
84a12e66 | 570 | drv = find_image_format(filename); |
51d7c00c | 571 | } |
6987307c | 572 | |
51d7c00c AL |
573 | if (!drv) { |
574 | ret = -ENOENT; | |
575 | goto unlink_and_fail; | |
ea2384d3 | 576 | } |
b6ce07aa KW |
577 | |
578 | /* Open the image */ | |
579 | ret = bdrv_open_common(bs, filename, flags, drv); | |
580 | if (ret < 0) { | |
6987307c CH |
581 | goto unlink_and_fail; |
582 | } | |
583 | ||
b6ce07aa KW |
584 | /* If there is a backing file, use it */ |
585 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
586 | char backing_filename[PATH_MAX]; | |
587 | int back_flags; | |
588 | BlockDriver *back_drv = NULL; | |
589 | ||
590 | bs->backing_hd = bdrv_new(""); | |
591 | path_combine(backing_filename, sizeof(backing_filename), | |
592 | filename, bs->backing_file); | |
593 | if (bs->backing_format[0] != '\0') | |
594 | back_drv = bdrv_find_format(bs->backing_format); | |
595 | ||
596 | /* backing files always opened read-only */ | |
597 | back_flags = | |
598 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
599 | ||
600 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
601 | if (ret < 0) { | |
602 | bdrv_close(bs); | |
603 | return ret; | |
604 | } | |
605 | if (bs->is_temporary) { | |
606 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
607 | } else { | |
608 | /* base image inherits from "parent" */ | |
609 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
610 | } | |
611 | } | |
612 | ||
613 | if (!bdrv_key_required(bs)) { | |
614 | /* call the change callback */ | |
615 | bs->media_changed = 1; | |
616 | if (bs->change_cb) | |
617 | bs->change_cb(bs->change_opaque); | |
618 | } | |
619 | ||
620 | return 0; | |
621 | ||
622 | unlink_and_fail: | |
623 | if (bs->is_temporary) { | |
624 | unlink(filename); | |
625 | } | |
626 | return ret; | |
627 | } | |
628 | ||
fc01f7e7 FB |
629 | void bdrv_close(BlockDriverState *bs) |
630 | { | |
19cb3738 | 631 | if (bs->drv) { |
557df6ac | 632 | if (bs->backing_hd) { |
ea2384d3 | 633 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
634 | bs->backing_hd = NULL; |
635 | } | |
ea2384d3 FB |
636 | bs->drv->bdrv_close(bs); |
637 | qemu_free(bs->opaque); | |
638 | #ifdef _WIN32 | |
639 | if (bs->is_temporary) { | |
640 | unlink(bs->filename); | |
641 | } | |
67b915a5 | 642 | #endif |
ea2384d3 FB |
643 | bs->opaque = NULL; |
644 | bs->drv = NULL; | |
b338082b | 645 | |
66f82cee KW |
646 | if (bs->file != NULL) { |
647 | bdrv_close(bs->file); | |
648 | } | |
649 | ||
b338082b | 650 | /* call the change callback */ |
19cb3738 | 651 | bs->media_changed = 1; |
b338082b FB |
652 | if (bs->change_cb) |
653 | bs->change_cb(bs->change_opaque); | |
654 | } | |
655 | } | |
656 | ||
2bc93fed MK |
657 | void bdrv_close_all(void) |
658 | { | |
659 | BlockDriverState *bs; | |
660 | ||
661 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
662 | bdrv_close(bs); | |
663 | } | |
664 | } | |
665 | ||
b338082b FB |
666 | void bdrv_delete(BlockDriverState *bs) |
667 | { | |
18846dee MA |
668 | assert(!bs->peer); |
669 | ||
1b7bdbc1 SH |
670 | /* remove from list, if necessary */ |
671 | if (bs->device_name[0] != '\0') { | |
672 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
673 | } | |
34c6f050 | 674 | |
b338082b | 675 | bdrv_close(bs); |
66f82cee KW |
676 | if (bs->file != NULL) { |
677 | bdrv_delete(bs->file); | |
678 | } | |
679 | ||
b338082b | 680 | qemu_free(bs); |
fc01f7e7 FB |
681 | } |
682 | ||
18846dee MA |
683 | int bdrv_attach(BlockDriverState *bs, DeviceState *qdev) |
684 | { | |
685 | if (bs->peer) { | |
686 | return -EBUSY; | |
687 | } | |
688 | bs->peer = qdev; | |
689 | return 0; | |
690 | } | |
691 | ||
692 | void bdrv_detach(BlockDriverState *bs, DeviceState *qdev) | |
693 | { | |
694 | assert(bs->peer == qdev); | |
695 | bs->peer = NULL; | |
696 | } | |
697 | ||
698 | DeviceState *bdrv_get_attached(BlockDriverState *bs) | |
699 | { | |
700 | return bs->peer; | |
701 | } | |
702 | ||
e97fc193 AL |
703 | /* |
704 | * Run consistency checks on an image | |
705 | * | |
706 | * Returns the number of errors or -errno when an internal error occurs | |
707 | */ | |
708 | int bdrv_check(BlockDriverState *bs) | |
709 | { | |
710 | if (bs->drv->bdrv_check == NULL) { | |
711 | return -ENOTSUP; | |
712 | } | |
713 | ||
714 | return bs->drv->bdrv_check(bs); | |
715 | } | |
716 | ||
33e3963e FB |
717 | /* commit COW file into the raw image */ |
718 | int bdrv_commit(BlockDriverState *bs) | |
719 | { | |
19cb3738 | 720 | BlockDriver *drv = bs->drv; |
83f64091 | 721 | int64_t i, total_sectors; |
4dca4b63 NS |
722 | int n, j, ro, open_flags; |
723 | int ret = 0, rw_ret = 0; | |
eb5a3165 | 724 | unsigned char sector[BDRV_SECTOR_SIZE]; |
4dca4b63 NS |
725 | char filename[1024]; |
726 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 727 | |
19cb3738 FB |
728 | if (!drv) |
729 | return -ENOMEDIUM; | |
4dca4b63 NS |
730 | |
731 | if (!bs->backing_hd) { | |
732 | return -ENOTSUP; | |
33e3963e FB |
733 | } |
734 | ||
4dca4b63 NS |
735 | if (bs->backing_hd->keep_read_only) { |
736 | return -EACCES; | |
737 | } | |
738 | ||
739 | ro = bs->backing_hd->read_only; | |
740 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
741 | open_flags = bs->backing_hd->open_flags; | |
742 | ||
743 | if (ro) { | |
744 | /* re-open as RW */ | |
745 | bdrv_delete(bs->backing_hd); | |
746 | bs->backing_hd = NULL; | |
747 | bs_rw = bdrv_new(""); | |
c3349197 | 748 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
4dca4b63 NS |
749 | if (rw_ret < 0) { |
750 | bdrv_delete(bs_rw); | |
751 | /* try to re-open read-only */ | |
752 | bs_ro = bdrv_new(""); | |
c3349197 | 753 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
754 | if (ret < 0) { |
755 | bdrv_delete(bs_ro); | |
756 | /* drive not functional anymore */ | |
757 | bs->drv = NULL; | |
758 | return ret; | |
759 | } | |
760 | bs->backing_hd = bs_ro; | |
761 | return rw_ret; | |
762 | } | |
763 | bs->backing_hd = bs_rw; | |
ea2384d3 | 764 | } |
33e3963e | 765 | |
6ea44308 | 766 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 767 | for (i = 0; i < total_sectors;) { |
19cb3738 | 768 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
769 | for(j = 0; j < n; j++) { |
770 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
4dca4b63 NS |
771 | ret = -EIO; |
772 | goto ro_cleanup; | |
ea2384d3 FB |
773 | } |
774 | ||
775 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
4dca4b63 NS |
776 | ret = -EIO; |
777 | goto ro_cleanup; | |
ea2384d3 FB |
778 | } |
779 | i++; | |
33e3963e | 780 | } |
ea2384d3 FB |
781 | } else { |
782 | i += n; | |
783 | } | |
33e3963e | 784 | } |
95389c86 | 785 | |
1d44952f CH |
786 | if (drv->bdrv_make_empty) { |
787 | ret = drv->bdrv_make_empty(bs); | |
788 | bdrv_flush(bs); | |
789 | } | |
95389c86 | 790 | |
3f5075ae CH |
791 | /* |
792 | * Make sure all data we wrote to the backing device is actually | |
793 | * stable on disk. | |
794 | */ | |
795 | if (bs->backing_hd) | |
796 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
797 | |
798 | ro_cleanup: | |
799 | ||
800 | if (ro) { | |
801 | /* re-open as RO */ | |
802 | bdrv_delete(bs->backing_hd); | |
803 | bs->backing_hd = NULL; | |
804 | bs_ro = bdrv_new(""); | |
c3349197 | 805 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
806 | if (ret < 0) { |
807 | bdrv_delete(bs_ro); | |
808 | /* drive not functional anymore */ | |
809 | bs->drv = NULL; | |
810 | return ret; | |
811 | } | |
812 | bs->backing_hd = bs_ro; | |
813 | bs->backing_hd->keep_read_only = 0; | |
814 | } | |
815 | ||
1d44952f | 816 | return ret; |
33e3963e FB |
817 | } |
818 | ||
6ab4b5ab MA |
819 | void bdrv_commit_all(void) |
820 | { | |
821 | BlockDriverState *bs; | |
822 | ||
823 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
824 | bdrv_commit(bs); | |
825 | } | |
826 | } | |
827 | ||
756e6736 KW |
828 | /* |
829 | * Return values: | |
830 | * 0 - success | |
831 | * -EINVAL - backing format specified, but no file | |
832 | * -ENOSPC - can't update the backing file because no space is left in the | |
833 | * image file header | |
834 | * -ENOTSUP - format driver doesn't support changing the backing file | |
835 | */ | |
836 | int bdrv_change_backing_file(BlockDriverState *bs, | |
837 | const char *backing_file, const char *backing_fmt) | |
838 | { | |
839 | BlockDriver *drv = bs->drv; | |
840 | ||
841 | if (drv->bdrv_change_backing_file != NULL) { | |
842 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
843 | } else { | |
844 | return -ENOTSUP; | |
845 | } | |
846 | } | |
847 | ||
71d0770c AL |
848 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
849 | size_t size) | |
850 | { | |
851 | int64_t len; | |
852 | ||
853 | if (!bdrv_is_inserted(bs)) | |
854 | return -ENOMEDIUM; | |
855 | ||
856 | if (bs->growable) | |
857 | return 0; | |
858 | ||
859 | len = bdrv_getlength(bs); | |
860 | ||
fbb7b4e0 KW |
861 | if (offset < 0) |
862 | return -EIO; | |
863 | ||
864 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
865 | return -EIO; |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
871 | int nb_sectors) | |
872 | { | |
eb5a3165 JS |
873 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
874 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
875 | } |
876 | ||
19cb3738 | 877 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 878 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
879 | uint8_t *buf, int nb_sectors) |
880 | { | |
ea2384d3 FB |
881 | BlockDriver *drv = bs->drv; |
882 | ||
19cb3738 FB |
883 | if (!drv) |
884 | return -ENOMEDIUM; | |
71d0770c AL |
885 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
886 | return -EIO; | |
b338082b | 887 | |
eda578e5 | 888 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
889 | } |
890 | ||
7cd1e32a | 891 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 892 | int nb_sectors, int dirty) |
7cd1e32a | 893 | { |
894 | int64_t start, end; | |
c6d22830 | 895 | unsigned long val, idx, bit; |
a55eb92c | 896 | |
6ea44308 | 897 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 898 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
899 | |
900 | for (; start <= end; start++) { | |
c6d22830 JK |
901 | idx = start / (sizeof(unsigned long) * 8); |
902 | bit = start % (sizeof(unsigned long) * 8); | |
903 | val = bs->dirty_bitmap[idx]; | |
904 | if (dirty) { | |
aaa0eb75 LS |
905 | if (!(val & (1 << bit))) { |
906 | bs->dirty_count++; | |
907 | val |= 1 << bit; | |
908 | } | |
c6d22830 | 909 | } else { |
aaa0eb75 LS |
910 | if (val & (1 << bit)) { |
911 | bs->dirty_count--; | |
912 | val &= ~(1 << bit); | |
913 | } | |
c6d22830 JK |
914 | } |
915 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 916 | } |
917 | } | |
918 | ||
5fafdf24 | 919 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
920 | -EIO generic I/O error (may happen for all errors) |
921 | -ENOMEDIUM No media inserted. | |
922 | -EINVAL Invalid sector number or nb_sectors | |
923 | -EACCES Trying to write a read-only device | |
924 | */ | |
5fafdf24 | 925 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
926 | const uint8_t *buf, int nb_sectors) |
927 | { | |
83f64091 | 928 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
929 | if (!bs->drv) |
930 | return -ENOMEDIUM; | |
0849bf08 | 931 | if (bs->read_only) |
19cb3738 | 932 | return -EACCES; |
71d0770c AL |
933 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
934 | return -EIO; | |
a55eb92c | 935 | |
c6d22830 | 936 | if (bs->dirty_bitmap) { |
7cd1e32a | 937 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
938 | } | |
a55eb92c | 939 | |
294cc35f KW |
940 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
941 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
942 | } | |
943 | ||
42fb2807 | 944 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
945 | } |
946 | ||
eda578e5 AL |
947 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
948 | void *buf, int count1) | |
83f64091 | 949 | { |
6ea44308 | 950 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
951 | int len, nb_sectors, count; |
952 | int64_t sector_num; | |
9a8c4cce | 953 | int ret; |
83f64091 FB |
954 | |
955 | count = count1; | |
956 | /* first read to align to sector start */ | |
6ea44308 | 957 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
958 | if (len > count) |
959 | len = count; | |
6ea44308 | 960 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 961 | if (len > 0) { |
9a8c4cce KW |
962 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
963 | return ret; | |
6ea44308 | 964 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
965 | count -= len; |
966 | if (count == 0) | |
967 | return count1; | |
968 | sector_num++; | |
969 | buf += len; | |
970 | } | |
971 | ||
972 | /* read the sectors "in place" */ | |
6ea44308 | 973 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 974 | if (nb_sectors > 0) { |
9a8c4cce KW |
975 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
976 | return ret; | |
83f64091 | 977 | sector_num += nb_sectors; |
6ea44308 | 978 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
979 | buf += len; |
980 | count -= len; | |
981 | } | |
982 | ||
983 | /* add data from the last sector */ | |
984 | if (count > 0) { | |
9a8c4cce KW |
985 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
986 | return ret; | |
83f64091 FB |
987 | memcpy(buf, tmp_buf, count); |
988 | } | |
989 | return count1; | |
990 | } | |
991 | ||
eda578e5 AL |
992 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
993 | const void *buf, int count1) | |
83f64091 | 994 | { |
6ea44308 | 995 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
996 | int len, nb_sectors, count; |
997 | int64_t sector_num; | |
9a8c4cce | 998 | int ret; |
83f64091 FB |
999 | |
1000 | count = count1; | |
1001 | /* first write to align to sector start */ | |
6ea44308 | 1002 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1003 | if (len > count) |
1004 | len = count; | |
6ea44308 | 1005 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1006 | if (len > 0) { |
9a8c4cce KW |
1007 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1008 | return ret; | |
6ea44308 | 1009 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1010 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1011 | return ret; | |
83f64091 FB |
1012 | count -= len; |
1013 | if (count == 0) | |
1014 | return count1; | |
1015 | sector_num++; | |
1016 | buf += len; | |
1017 | } | |
1018 | ||
1019 | /* write the sectors "in place" */ | |
6ea44308 | 1020 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1021 | if (nb_sectors > 0) { |
9a8c4cce KW |
1022 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1023 | return ret; | |
83f64091 | 1024 | sector_num += nb_sectors; |
6ea44308 | 1025 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1026 | buf += len; |
1027 | count -= len; | |
1028 | } | |
1029 | ||
1030 | /* add data from the last sector */ | |
1031 | if (count > 0) { | |
9a8c4cce KW |
1032 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1033 | return ret; | |
83f64091 | 1034 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1035 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1036 | return ret; | |
83f64091 FB |
1037 | } |
1038 | return count1; | |
1039 | } | |
83f64091 | 1040 | |
f08145fe KW |
1041 | /* |
1042 | * Writes to the file and ensures that no writes are reordered across this | |
1043 | * request (acts as a barrier) | |
1044 | * | |
1045 | * Returns 0 on success, -errno in error cases. | |
1046 | */ | |
1047 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1048 | const void *buf, int count) | |
1049 | { | |
1050 | int ret; | |
1051 | ||
1052 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1053 | if (ret < 0) { | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* No flush needed for cache=writethrough, it uses O_DSYNC */ | |
1058 | if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { | |
1059 | bdrv_flush(bs); | |
1060 | } | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Writes to the file and ensures that no writes are reordered across this | |
1067 | * request (acts as a barrier) | |
1068 | * | |
1069 | * Returns 0 on success, -errno in error cases. | |
1070 | */ | |
1071 | int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, | |
1072 | const uint8_t *buf, int nb_sectors) | |
1073 | { | |
1074 | return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, | |
1075 | buf, BDRV_SECTOR_SIZE * nb_sectors); | |
1076 | } | |
1077 | ||
83f64091 FB |
1078 | /** |
1079 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1080 | */ | |
1081 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1082 | { | |
1083 | BlockDriver *drv = bs->drv; | |
51762288 | 1084 | int ret; |
83f64091 | 1085 | if (!drv) |
19cb3738 | 1086 | return -ENOMEDIUM; |
83f64091 FB |
1087 | if (!drv->bdrv_truncate) |
1088 | return -ENOTSUP; | |
59f2689d NS |
1089 | if (bs->read_only) |
1090 | return -EACCES; | |
51762288 SH |
1091 | ret = drv->bdrv_truncate(bs, offset); |
1092 | if (ret == 0) { | |
1093 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1094 | } | |
1095 | return ret; | |
83f64091 FB |
1096 | } |
1097 | ||
1098 | /** | |
1099 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1100 | */ | |
1101 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1102 | { | |
1103 | BlockDriver *drv = bs->drv; | |
1104 | if (!drv) | |
19cb3738 | 1105 | return -ENOMEDIUM; |
51762288 SH |
1106 | |
1107 | /* Fixed size devices use the total_sectors value for speed instead of | |
1108 | issuing a length query (like lseek) on each call. Also, legacy block | |
1109 | drivers don't provide a bdrv_getlength function and must use | |
1110 | total_sectors. */ | |
1111 | if (!bs->growable || !drv->bdrv_getlength) { | |
6ea44308 | 1112 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
1113 | } |
1114 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
1115 | } |
1116 | ||
19cb3738 | 1117 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1118 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1119 | { |
19cb3738 FB |
1120 | int64_t length; |
1121 | length = bdrv_getlength(bs); | |
1122 | if (length < 0) | |
1123 | length = 0; | |
1124 | else | |
6ea44308 | 1125 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1126 | *nb_sectors_ptr = length; |
fc01f7e7 | 1127 | } |
cf98951b | 1128 | |
f3d54fc4 AL |
1129 | struct partition { |
1130 | uint8_t boot_ind; /* 0x80 - active */ | |
1131 | uint8_t head; /* starting head */ | |
1132 | uint8_t sector; /* starting sector */ | |
1133 | uint8_t cyl; /* starting cylinder */ | |
1134 | uint8_t sys_ind; /* What partition type */ | |
1135 | uint8_t end_head; /* end head */ | |
1136 | uint8_t end_sector; /* end sector */ | |
1137 | uint8_t end_cyl; /* end cylinder */ | |
1138 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1139 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1140 | } __attribute__((packed)); | |
1141 | ||
1142 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1143 | static int guess_disk_lchs(BlockDriverState *bs, | |
1144 | int *pcylinders, int *pheads, int *psectors) | |
1145 | { | |
eb5a3165 | 1146 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
1147 | int ret, i, heads, sectors, cylinders; |
1148 | struct partition *p; | |
1149 | uint32_t nr_sects; | |
a38131b6 | 1150 | uint64_t nb_sectors; |
f3d54fc4 AL |
1151 | |
1152 | bdrv_get_geometry(bs, &nb_sectors); | |
1153 | ||
1154 | ret = bdrv_read(bs, 0, buf, 1); | |
1155 | if (ret < 0) | |
1156 | return -1; | |
1157 | /* test msdos magic */ | |
1158 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1159 | return -1; | |
1160 | for(i = 0; i < 4; i++) { | |
1161 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1162 | nr_sects = le32_to_cpu(p->nr_sects); | |
1163 | if (nr_sects && p->end_head) { | |
1164 | /* We make the assumption that the partition terminates on | |
1165 | a cylinder boundary */ | |
1166 | heads = p->end_head + 1; | |
1167 | sectors = p->end_sector & 63; | |
1168 | if (sectors == 0) | |
1169 | continue; | |
1170 | cylinders = nb_sectors / (heads * sectors); | |
1171 | if (cylinders < 1 || cylinders > 16383) | |
1172 | continue; | |
1173 | *pheads = heads; | |
1174 | *psectors = sectors; | |
1175 | *pcylinders = cylinders; | |
1176 | #if 0 | |
1177 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1178 | cylinders, heads, sectors); | |
1179 | #endif | |
1180 | return 0; | |
1181 | } | |
1182 | } | |
1183 | return -1; | |
1184 | } | |
1185 | ||
1186 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1187 | { | |
1188 | int translation, lba_detected = 0; | |
1189 | int cylinders, heads, secs; | |
a38131b6 | 1190 | uint64_t nb_sectors; |
f3d54fc4 AL |
1191 | |
1192 | /* if a geometry hint is available, use it */ | |
1193 | bdrv_get_geometry(bs, &nb_sectors); | |
1194 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1195 | translation = bdrv_get_translation_hint(bs); | |
1196 | if (cylinders != 0) { | |
1197 | *pcyls = cylinders; | |
1198 | *pheads = heads; | |
1199 | *psecs = secs; | |
1200 | } else { | |
1201 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1202 | if (heads > 16) { | |
1203 | /* if heads > 16, it means that a BIOS LBA | |
1204 | translation was active, so the default | |
1205 | hardware geometry is OK */ | |
1206 | lba_detected = 1; | |
1207 | goto default_geometry; | |
1208 | } else { | |
1209 | *pcyls = cylinders; | |
1210 | *pheads = heads; | |
1211 | *psecs = secs; | |
1212 | /* disable any translation to be in sync with | |
1213 | the logical geometry */ | |
1214 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1215 | bdrv_set_translation_hint(bs, | |
1216 | BIOS_ATA_TRANSLATION_NONE); | |
1217 | } | |
1218 | } | |
1219 | } else { | |
1220 | default_geometry: | |
1221 | /* if no geometry, use a standard physical disk geometry */ | |
1222 | cylinders = nb_sectors / (16 * 63); | |
1223 | ||
1224 | if (cylinders > 16383) | |
1225 | cylinders = 16383; | |
1226 | else if (cylinders < 2) | |
1227 | cylinders = 2; | |
1228 | *pcyls = cylinders; | |
1229 | *pheads = 16; | |
1230 | *psecs = 63; | |
1231 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1232 | if ((*pcyls * *pheads) <= 131072) { | |
1233 | bdrv_set_translation_hint(bs, | |
1234 | BIOS_ATA_TRANSLATION_LARGE); | |
1235 | } else { | |
1236 | bdrv_set_translation_hint(bs, | |
1237 | BIOS_ATA_TRANSLATION_LBA); | |
1238 | } | |
1239 | } | |
1240 | } | |
1241 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1242 | } | |
1243 | } | |
1244 | ||
5fafdf24 | 1245 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1246 | int cyls, int heads, int secs) |
1247 | { | |
1248 | bs->cyls = cyls; | |
1249 | bs->heads = heads; | |
1250 | bs->secs = secs; | |
1251 | } | |
1252 | ||
1253 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1254 | { | |
1255 | bs->type = type; | |
1256 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1257 | type == BDRV_TYPE_FLOPPY)); | |
1258 | } | |
1259 | ||
46d4767d FB |
1260 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1261 | { | |
1262 | bs->translation = translation; | |
1263 | } | |
1264 | ||
5fafdf24 | 1265 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1266 | int *pcyls, int *pheads, int *psecs) |
1267 | { | |
1268 | *pcyls = bs->cyls; | |
1269 | *pheads = bs->heads; | |
1270 | *psecs = bs->secs; | |
1271 | } | |
1272 | ||
1273 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1274 | { | |
1275 | return bs->type; | |
1276 | } | |
1277 | ||
46d4767d FB |
1278 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1279 | { | |
1280 | return bs->translation; | |
1281 | } | |
1282 | ||
abd7f68d MA |
1283 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
1284 | BlockErrorAction on_write_error) | |
1285 | { | |
1286 | bs->on_read_error = on_read_error; | |
1287 | bs->on_write_error = on_write_error; | |
1288 | } | |
1289 | ||
1290 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1291 | { | |
1292 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1293 | } | |
1294 | ||
b338082b FB |
1295 | int bdrv_is_removable(BlockDriverState *bs) |
1296 | { | |
1297 | return bs->removable; | |
1298 | } | |
1299 | ||
1300 | int bdrv_is_read_only(BlockDriverState *bs) | |
1301 | { | |
1302 | return bs->read_only; | |
1303 | } | |
1304 | ||
985a03b0 TS |
1305 | int bdrv_is_sg(BlockDriverState *bs) |
1306 | { | |
1307 | return bs->sg; | |
1308 | } | |
1309 | ||
e900a7b7 CH |
1310 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1311 | { | |
1312 | return bs->enable_write_cache; | |
1313 | } | |
1314 | ||
19cb3738 | 1315 | /* XXX: no longer used */ |
5fafdf24 | 1316 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1317 | void (*change_cb)(void *opaque), void *opaque) |
1318 | { | |
1319 | bs->change_cb = change_cb; | |
1320 | bs->change_opaque = opaque; | |
1321 | } | |
1322 | ||
ea2384d3 FB |
1323 | int bdrv_is_encrypted(BlockDriverState *bs) |
1324 | { | |
1325 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1326 | return 1; | |
1327 | return bs->encrypted; | |
1328 | } | |
1329 | ||
c0f4ce77 AL |
1330 | int bdrv_key_required(BlockDriverState *bs) |
1331 | { | |
1332 | BlockDriverState *backing_hd = bs->backing_hd; | |
1333 | ||
1334 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1335 | return 1; | |
1336 | return (bs->encrypted && !bs->valid_key); | |
1337 | } | |
1338 | ||
ea2384d3 FB |
1339 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1340 | { | |
1341 | int ret; | |
1342 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1343 | ret = bdrv_set_key(bs->backing_hd, key); | |
1344 | if (ret < 0) | |
1345 | return ret; | |
1346 | if (!bs->encrypted) | |
1347 | return 0; | |
1348 | } | |
fd04a2ae SH |
1349 | if (!bs->encrypted) { |
1350 | return -EINVAL; | |
1351 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1352 | return -ENOMEDIUM; | |
1353 | } | |
c0f4ce77 | 1354 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1355 | if (ret < 0) { |
1356 | bs->valid_key = 0; | |
1357 | } else if (!bs->valid_key) { | |
1358 | bs->valid_key = 1; | |
1359 | /* call the change callback now, we skipped it on open */ | |
1360 | bs->media_changed = 1; | |
1361 | if (bs->change_cb) | |
1362 | bs->change_cb(bs->change_opaque); | |
1363 | } | |
c0f4ce77 | 1364 | return ret; |
ea2384d3 FB |
1365 | } |
1366 | ||
1367 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1368 | { | |
19cb3738 | 1369 | if (!bs->drv) { |
ea2384d3 FB |
1370 | buf[0] = '\0'; |
1371 | } else { | |
1372 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1373 | } | |
1374 | } | |
1375 | ||
5fafdf24 | 1376 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1377 | void *opaque) |
1378 | { | |
1379 | BlockDriver *drv; | |
1380 | ||
8a22f02a | 1381 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1382 | it(opaque, drv->format_name); |
1383 | } | |
1384 | } | |
1385 | ||
b338082b FB |
1386 | BlockDriverState *bdrv_find(const char *name) |
1387 | { | |
1388 | BlockDriverState *bs; | |
1389 | ||
1b7bdbc1 SH |
1390 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1391 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1392 | return bs; |
1b7bdbc1 | 1393 | } |
b338082b FB |
1394 | } |
1395 | return NULL; | |
1396 | } | |
1397 | ||
2f399b0a MA |
1398 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
1399 | { | |
1400 | if (!bs) { | |
1401 | return QTAILQ_FIRST(&bdrv_states); | |
1402 | } | |
1403 | return QTAILQ_NEXT(bs, list); | |
1404 | } | |
1405 | ||
51de9760 | 1406 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1407 | { |
1408 | BlockDriverState *bs; | |
1409 | ||
1b7bdbc1 | 1410 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1411 | it(opaque, bs); |
81d0912d FB |
1412 | } |
1413 | } | |
1414 | ||
ea2384d3 FB |
1415 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1416 | { | |
1417 | return bs->device_name; | |
1418 | } | |
1419 | ||
7a6cba61 PB |
1420 | void bdrv_flush(BlockDriverState *bs) |
1421 | { | |
016f5cf6 AG |
1422 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
1423 | return; | |
1424 | } | |
1425 | ||
3f5075ae | 1426 | if (bs->drv && bs->drv->bdrv_flush) |
7a6cba61 | 1427 | bs->drv->bdrv_flush(bs); |
7a6cba61 PB |
1428 | } |
1429 | ||
c6ca28d6 AL |
1430 | void bdrv_flush_all(void) |
1431 | { | |
1432 | BlockDriverState *bs; | |
1433 | ||
1b7bdbc1 SH |
1434 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1435 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1436 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
c6ca28d6 | 1437 | bdrv_flush(bs); |
1b7bdbc1 SH |
1438 | } |
1439 | } | |
c6ca28d6 AL |
1440 | } |
1441 | ||
f2feebbd KW |
1442 | int bdrv_has_zero_init(BlockDriverState *bs) |
1443 | { | |
1444 | assert(bs->drv); | |
1445 | ||
1446 | if (bs->drv->no_zero_init) { | |
1447 | return 0; | |
1448 | } else if (bs->file) { | |
1449 | return bdrv_has_zero_init(bs->file); | |
1450 | } | |
1451 | ||
1452 | return 1; | |
1453 | } | |
1454 | ||
f58c7b35 TS |
1455 | /* |
1456 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1457 | * not implementing the functionality are assumed to not support backing files, | |
1458 | * hence all their sectors are reported as allocated. | |
1459 | * | |
1460 | * 'pnum' is set to the number of sectors (including and immediately following | |
1461 | * the specified sector) that are known to be in the same | |
1462 | * allocated/unallocated state. | |
1463 | * | |
1464 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1465 | */ | |
1466 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1467 | int *pnum) | |
1468 | { | |
1469 | int64_t n; | |
1470 | if (!bs->drv->bdrv_is_allocated) { | |
1471 | if (sector_num >= bs->total_sectors) { | |
1472 | *pnum = 0; | |
1473 | return 0; | |
1474 | } | |
1475 | n = bs->total_sectors - sector_num; | |
1476 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1477 | return 1; | |
1478 | } | |
1479 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1480 | } | |
1481 | ||
2582bfed LC |
1482 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1483 | BlockMonEventAction action, int is_read) | |
1484 | { | |
1485 | QObject *data; | |
1486 | const char *action_str; | |
1487 | ||
1488 | switch (action) { | |
1489 | case BDRV_ACTION_REPORT: | |
1490 | action_str = "report"; | |
1491 | break; | |
1492 | case BDRV_ACTION_IGNORE: | |
1493 | action_str = "ignore"; | |
1494 | break; | |
1495 | case BDRV_ACTION_STOP: | |
1496 | action_str = "stop"; | |
1497 | break; | |
1498 | default: | |
1499 | abort(); | |
1500 | } | |
1501 | ||
1502 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1503 | bdrv->device_name, | |
1504 | action_str, | |
1505 | is_read ? "read" : "write"); | |
1506 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1507 | ||
1508 | qobject_decref(data); | |
1509 | } | |
1510 | ||
d15e5465 | 1511 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1512 | { |
d15e5465 LC |
1513 | QDict *bs_dict; |
1514 | Monitor *mon = opaque; | |
1515 | ||
1516 | bs_dict = qobject_to_qdict(obj); | |
1517 | ||
1518 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1519 | qdict_get_str(bs_dict, "device"), | |
1520 | qdict_get_str(bs_dict, "type"), | |
1521 | qdict_get_bool(bs_dict, "removable")); | |
1522 | ||
1523 | if (qdict_get_bool(bs_dict, "removable")) { | |
1524 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1525 | } | |
1526 | ||
1527 | if (qdict_haskey(bs_dict, "inserted")) { | |
1528 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1529 | ||
1530 | monitor_printf(mon, " file="); | |
1531 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1532 | if (qdict_haskey(qdict, "backing_file")) { | |
1533 | monitor_printf(mon, " backing_file="); | |
1534 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1535 | } | |
1536 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1537 | qdict_get_bool(qdict, "ro"), | |
1538 | qdict_get_str(qdict, "drv"), | |
1539 | qdict_get_bool(qdict, "encrypted")); | |
1540 | } else { | |
1541 | monitor_printf(mon, " [not inserted]"); | |
1542 | } | |
1543 | ||
1544 | monitor_printf(mon, "\n"); | |
1545 | } | |
1546 | ||
1547 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1548 | { | |
1549 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1550 | } | |
1551 | ||
d15e5465 LC |
1552 | void bdrv_info(Monitor *mon, QObject **ret_data) |
1553 | { | |
1554 | QList *bs_list; | |
b338082b FB |
1555 | BlockDriverState *bs; |
1556 | ||
d15e5465 LC |
1557 | bs_list = qlist_new(); |
1558 | ||
1b7bdbc1 | 1559 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 LC |
1560 | QObject *bs_obj; |
1561 | const char *type = "unknown"; | |
1562 | ||
b338082b FB |
1563 | switch(bs->type) { |
1564 | case BDRV_TYPE_HD: | |
d15e5465 | 1565 | type = "hd"; |
b338082b FB |
1566 | break; |
1567 | case BDRV_TYPE_CDROM: | |
d15e5465 | 1568 | type = "cdrom"; |
b338082b FB |
1569 | break; |
1570 | case BDRV_TYPE_FLOPPY: | |
d15e5465 | 1571 | type = "floppy"; |
b338082b FB |
1572 | break; |
1573 | } | |
d15e5465 LC |
1574 | |
1575 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1576 | "'removable': %i, 'locked': %i }", | |
1577 | bs->device_name, type, bs->removable, | |
1578 | bs->locked); | |
d15e5465 | 1579 | |
19cb3738 | 1580 | if (bs->drv) { |
d15e5465 LC |
1581 | QObject *obj; |
1582 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1583 | ||
1584 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1585 | "'encrypted': %i }", | |
1586 | bs->filename, bs->read_only, | |
1587 | bs->drv->format_name, | |
1588 | bdrv_is_encrypted(bs)); | |
fef30743 | 1589 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1590 | QDict *qdict = qobject_to_qdict(obj); |
1591 | qdict_put(qdict, "backing_file", | |
1592 | qstring_from_str(bs->backing_file)); | |
376253ec | 1593 | } |
d15e5465 LC |
1594 | |
1595 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1596 | } |
d15e5465 | 1597 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1598 | } |
d15e5465 LC |
1599 | |
1600 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1601 | } |
a36e69dd | 1602 | |
218a536a | 1603 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1604 | { |
218a536a LC |
1605 | QDict *qdict; |
1606 | Monitor *mon = opaque; | |
1607 | ||
1608 | qdict = qobject_to_qdict(data); | |
1609 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1610 | ||
1611 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1612 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1613 | " wr_bytes=%" PRId64 | |
1614 | " rd_operations=%" PRId64 | |
1615 | " wr_operations=%" PRId64 | |
1616 | "\n", | |
1617 | qdict_get_int(qdict, "rd_bytes"), | |
1618 | qdict_get_int(qdict, "wr_bytes"), | |
1619 | qdict_get_int(qdict, "rd_operations"), | |
1620 | qdict_get_int(qdict, "wr_operations")); | |
1621 | } | |
1622 | ||
1623 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1624 | { | |
1625 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1626 | } | |
1627 | ||
294cc35f KW |
1628 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
1629 | { | |
1630 | QObject *res; | |
1631 | QDict *dict; | |
1632 | ||
1633 | res = qobject_from_jsonf("{ 'stats': {" | |
1634 | "'rd_bytes': %" PRId64 "," | |
1635 | "'wr_bytes': %" PRId64 "," | |
1636 | "'rd_operations': %" PRId64 "," | |
1637 | "'wr_operations': %" PRId64 "," | |
1638 | "'wr_highest_offset': %" PRId64 | |
1639 | "} }", | |
1640 | bs->rd_bytes, bs->wr_bytes, | |
1641 | bs->rd_ops, bs->wr_ops, | |
5ffbbc67 BS |
1642 | bs->wr_highest_sector * |
1643 | (uint64_t)BDRV_SECTOR_SIZE); | |
294cc35f KW |
1644 | dict = qobject_to_qdict(res); |
1645 | ||
1646 | if (*bs->device_name) { | |
1647 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1648 | } | |
1649 | ||
1650 | if (bs->file) { | |
1651 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1652 | qdict_put_obj(dict, "parent", parent); | |
1653 | } | |
1654 | ||
1655 | return res; | |
1656 | } | |
1657 | ||
218a536a LC |
1658 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
1659 | { | |
1660 | QObject *obj; | |
1661 | QList *devices; | |
a36e69dd TS |
1662 | BlockDriverState *bs; |
1663 | ||
218a536a LC |
1664 | devices = qlist_new(); |
1665 | ||
1b7bdbc1 | 1666 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
294cc35f | 1667 | obj = bdrv_info_stats_bs(bs); |
218a536a | 1668 | qlist_append_obj(devices, obj); |
a36e69dd | 1669 | } |
218a536a LC |
1670 | |
1671 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1672 | } |
ea2384d3 | 1673 | |
045df330 AL |
1674 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1675 | { | |
1676 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1677 | return bs->backing_file; | |
1678 | else if (bs->encrypted) | |
1679 | return bs->filename; | |
1680 | else | |
1681 | return NULL; | |
1682 | } | |
1683 | ||
5fafdf24 | 1684 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1685 | char *filename, int filename_size) |
1686 | { | |
b783e409 | 1687 | if (!bs->backing_file) { |
83f64091 FB |
1688 | pstrcpy(filename, filename_size, ""); |
1689 | } else { | |
1690 | pstrcpy(filename, filename_size, bs->backing_file); | |
1691 | } | |
1692 | } | |
1693 | ||
5fafdf24 | 1694 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1695 | const uint8_t *buf, int nb_sectors) |
1696 | { | |
1697 | BlockDriver *drv = bs->drv; | |
1698 | if (!drv) | |
19cb3738 | 1699 | return -ENOMEDIUM; |
faea38e7 FB |
1700 | if (!drv->bdrv_write_compressed) |
1701 | return -ENOTSUP; | |
fbb7b4e0 KW |
1702 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1703 | return -EIO; | |
a55eb92c | 1704 | |
c6d22830 | 1705 | if (bs->dirty_bitmap) { |
7cd1e32a | 1706 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1707 | } | |
a55eb92c | 1708 | |
faea38e7 FB |
1709 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1710 | } | |
3b46e624 | 1711 | |
faea38e7 FB |
1712 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1713 | { | |
1714 | BlockDriver *drv = bs->drv; | |
1715 | if (!drv) | |
19cb3738 | 1716 | return -ENOMEDIUM; |
faea38e7 FB |
1717 | if (!drv->bdrv_get_info) |
1718 | return -ENOTSUP; | |
1719 | memset(bdi, 0, sizeof(*bdi)); | |
1720 | return drv->bdrv_get_info(bs, bdi); | |
1721 | } | |
1722 | ||
45566e9c CH |
1723 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1724 | int64_t pos, int size) | |
178e08a5 AL |
1725 | { |
1726 | BlockDriver *drv = bs->drv; | |
1727 | if (!drv) | |
1728 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1729 | if (drv->bdrv_save_vmstate) |
1730 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1731 | if (bs->file) | |
1732 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
1733 | return -ENOTSUP; | |
178e08a5 AL |
1734 | } |
1735 | ||
45566e9c CH |
1736 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1737 | int64_t pos, int size) | |
178e08a5 AL |
1738 | { |
1739 | BlockDriver *drv = bs->drv; | |
1740 | if (!drv) | |
1741 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1742 | if (drv->bdrv_load_vmstate) |
1743 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
1744 | if (bs->file) | |
1745 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
1746 | return -ENOTSUP; | |
178e08a5 AL |
1747 | } |
1748 | ||
8b9b0cc2 KW |
1749 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
1750 | { | |
1751 | BlockDriver *drv = bs->drv; | |
1752 | ||
1753 | if (!drv || !drv->bdrv_debug_event) { | |
1754 | return; | |
1755 | } | |
1756 | ||
1757 | return drv->bdrv_debug_event(bs, event); | |
1758 | ||
1759 | } | |
1760 | ||
faea38e7 FB |
1761 | /**************************************************************/ |
1762 | /* handling of snapshots */ | |
1763 | ||
feeee5ac MDCF |
1764 | int bdrv_can_snapshot(BlockDriverState *bs) |
1765 | { | |
1766 | BlockDriver *drv = bs->drv; | |
1767 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | if (!drv->bdrv_snapshot_create) { | |
1772 | if (bs->file != NULL) { | |
1773 | return bdrv_can_snapshot(bs->file); | |
1774 | } | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | return 1; | |
1779 | } | |
1780 | ||
5fafdf24 | 1781 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1782 | QEMUSnapshotInfo *sn_info) |
1783 | { | |
1784 | BlockDriver *drv = bs->drv; | |
1785 | if (!drv) | |
19cb3738 | 1786 | return -ENOMEDIUM; |
7cdb1f6d MK |
1787 | if (drv->bdrv_snapshot_create) |
1788 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1789 | if (bs->file) | |
1790 | return bdrv_snapshot_create(bs->file, sn_info); | |
1791 | return -ENOTSUP; | |
faea38e7 FB |
1792 | } |
1793 | ||
5fafdf24 | 1794 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1795 | const char *snapshot_id) |
1796 | { | |
1797 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
1798 | int ret, open_ret; |
1799 | ||
faea38e7 | 1800 | if (!drv) |
19cb3738 | 1801 | return -ENOMEDIUM; |
7cdb1f6d MK |
1802 | if (drv->bdrv_snapshot_goto) |
1803 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1804 | ||
1805 | if (bs->file) { | |
1806 | drv->bdrv_close(bs); | |
1807 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
1808 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
1809 | if (open_ret < 0) { | |
1810 | bdrv_delete(bs->file); | |
1811 | bs->drv = NULL; | |
1812 | return open_ret; | |
1813 | } | |
1814 | return ret; | |
1815 | } | |
1816 | ||
1817 | return -ENOTSUP; | |
faea38e7 FB |
1818 | } |
1819 | ||
1820 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1821 | { | |
1822 | BlockDriver *drv = bs->drv; | |
1823 | if (!drv) | |
19cb3738 | 1824 | return -ENOMEDIUM; |
7cdb1f6d MK |
1825 | if (drv->bdrv_snapshot_delete) |
1826 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1827 | if (bs->file) | |
1828 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
1829 | return -ENOTSUP; | |
faea38e7 FB |
1830 | } |
1831 | ||
5fafdf24 | 1832 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1833 | QEMUSnapshotInfo **psn_info) |
1834 | { | |
1835 | BlockDriver *drv = bs->drv; | |
1836 | if (!drv) | |
19cb3738 | 1837 | return -ENOMEDIUM; |
7cdb1f6d MK |
1838 | if (drv->bdrv_snapshot_list) |
1839 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1840 | if (bs->file) | |
1841 | return bdrv_snapshot_list(bs->file, psn_info); | |
1842 | return -ENOTSUP; | |
faea38e7 FB |
1843 | } |
1844 | ||
1845 | #define NB_SUFFIXES 4 | |
1846 | ||
1847 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1848 | { | |
1849 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1850 | int64_t base; | |
1851 | int i; | |
1852 | ||
1853 | if (size <= 999) { | |
1854 | snprintf(buf, buf_size, "%" PRId64, size); | |
1855 | } else { | |
1856 | base = 1024; | |
1857 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1858 | if (size < (10 * base)) { | |
5fafdf24 | 1859 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1860 | (double)size / base, |
1861 | suffixes[i]); | |
1862 | break; | |
1863 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1864 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1865 | ((size + (base >> 1)) / base), |
1866 | suffixes[i]); | |
1867 | break; | |
1868 | } | |
1869 | base = base * 1024; | |
1870 | } | |
1871 | } | |
1872 | return buf; | |
1873 | } | |
1874 | ||
1875 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1876 | { | |
1877 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1878 | #ifdef _WIN32 |
1879 | struct tm *ptm; | |
1880 | #else | |
faea38e7 | 1881 | struct tm tm; |
3b9f94e1 | 1882 | #endif |
faea38e7 FB |
1883 | time_t ti; |
1884 | int64_t secs; | |
1885 | ||
1886 | if (!sn) { | |
5fafdf24 TS |
1887 | snprintf(buf, buf_size, |
1888 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1889 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1890 | } else { | |
1891 | ti = sn->date_sec; | |
3b9f94e1 FB |
1892 | #ifdef _WIN32 |
1893 | ptm = localtime(&ti); | |
1894 | strftime(date_buf, sizeof(date_buf), | |
1895 | "%Y-%m-%d %H:%M:%S", ptm); | |
1896 | #else | |
faea38e7 FB |
1897 | localtime_r(&ti, &tm); |
1898 | strftime(date_buf, sizeof(date_buf), | |
1899 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1900 | #endif |
faea38e7 FB |
1901 | secs = sn->vm_clock_nsec / 1000000000; |
1902 | snprintf(clock_buf, sizeof(clock_buf), | |
1903 | "%02d:%02d:%02d.%03d", | |
1904 | (int)(secs / 3600), | |
1905 | (int)((secs / 60) % 60), | |
5fafdf24 | 1906 | (int)(secs % 60), |
faea38e7 FB |
1907 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1908 | snprintf(buf, buf_size, | |
5fafdf24 | 1909 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1910 | sn->id_str, sn->name, |
1911 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1912 | date_buf, | |
1913 | clock_buf); | |
1914 | } | |
1915 | return buf; | |
1916 | } | |
1917 | ||
83f64091 | 1918 | |
ea2384d3 | 1919 | /**************************************************************/ |
83f64091 | 1920 | /* async I/Os */ |
ea2384d3 | 1921 | |
3b69e4b9 | 1922 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1923 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1924 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1925 | { |
1926 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1927 | BlockDriverAIOCB *ret; |
83f64091 | 1928 | |
19cb3738 | 1929 | if (!drv) |
ce1a14dc | 1930 | return NULL; |
71d0770c AL |
1931 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1932 | return NULL; | |
3b46e624 | 1933 | |
f141eafe AL |
1934 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1935 | cb, opaque); | |
a36e69dd TS |
1936 | |
1937 | if (ret) { | |
1938 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1939 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1940 | bs->rd_ops ++; |
1941 | } | |
1942 | ||
1943 | return ret; | |
ea2384d3 FB |
1944 | } |
1945 | ||
f141eafe AL |
1946 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1947 | QEMUIOVector *qiov, int nb_sectors, | |
1948 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1949 | { |
83f64091 | 1950 | BlockDriver *drv = bs->drv; |
a36e69dd | 1951 | BlockDriverAIOCB *ret; |
ea2384d3 | 1952 | |
19cb3738 | 1953 | if (!drv) |
ce1a14dc | 1954 | return NULL; |
83f64091 | 1955 | if (bs->read_only) |
ce1a14dc | 1956 | return NULL; |
71d0770c AL |
1957 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1958 | return NULL; | |
83f64091 | 1959 | |
c6d22830 | 1960 | if (bs->dirty_bitmap) { |
7cd1e32a | 1961 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1962 | } | |
a55eb92c | 1963 | |
f141eafe AL |
1964 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1965 | cb, opaque); | |
a36e69dd TS |
1966 | |
1967 | if (ret) { | |
294cc35f KW |
1968 | /* Update stats even though technically transfer has not happened. */ |
1969 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
1970 | bs->wr_ops ++; | |
1971 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1972 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1973 | } | |
a36e69dd TS |
1974 | } |
1975 | ||
1976 | return ret; | |
83f64091 FB |
1977 | } |
1978 | ||
40b4f539 KW |
1979 | |
1980 | typedef struct MultiwriteCB { | |
1981 | int error; | |
1982 | int num_requests; | |
1983 | int num_callbacks; | |
1984 | struct { | |
1985 | BlockDriverCompletionFunc *cb; | |
1986 | void *opaque; | |
1987 | QEMUIOVector *free_qiov; | |
1988 | void *free_buf; | |
1989 | } callbacks[]; | |
1990 | } MultiwriteCB; | |
1991 | ||
1992 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1993 | { | |
1994 | int i; | |
1995 | ||
1996 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1997 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
1998 | if (mcb->callbacks[i].free_qiov) { |
1999 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2000 | } | |
40b4f539 | 2001 | qemu_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 2002 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
2003 | } |
2004 | } | |
2005 | ||
2006 | static void multiwrite_cb(void *opaque, int ret) | |
2007 | { | |
2008 | MultiwriteCB *mcb = opaque; | |
2009 | ||
cb6d3ca0 | 2010 | if (ret < 0 && !mcb->error) { |
40b4f539 KW |
2011 | mcb->error = ret; |
2012 | multiwrite_user_cb(mcb); | |
2013 | } | |
2014 | ||
2015 | mcb->num_requests--; | |
2016 | if (mcb->num_requests == 0) { | |
2017 | if (mcb->error == 0) { | |
2018 | multiwrite_user_cb(mcb); | |
2019 | } | |
2020 | qemu_free(mcb); | |
2021 | } | |
2022 | } | |
2023 | ||
2024 | static int multiwrite_req_compare(const void *a, const void *b) | |
2025 | { | |
77be4366 CH |
2026 | const BlockRequest *req1 = a, *req2 = b; |
2027 | ||
2028 | /* | |
2029 | * Note that we can't simply subtract req2->sector from req1->sector | |
2030 | * here as that could overflow the return value. | |
2031 | */ | |
2032 | if (req1->sector > req2->sector) { | |
2033 | return 1; | |
2034 | } else if (req1->sector < req2->sector) { | |
2035 | return -1; | |
2036 | } else { | |
2037 | return 0; | |
2038 | } | |
40b4f539 KW |
2039 | } |
2040 | ||
2041 | /* | |
2042 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2043 | * requests that remain after merging. | |
2044 | */ | |
2045 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2046 | int num_reqs, MultiwriteCB *mcb) | |
2047 | { | |
2048 | int i, outidx; | |
2049 | ||
2050 | // Sort requests by start sector | |
2051 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2052 | ||
2053 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2054 | // filling up gaps with zero sectors. | |
2055 | outidx = 0; | |
2056 | for (i = 1; i < num_reqs; i++) { | |
2057 | int merge = 0; | |
2058 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2059 | ||
2060 | // This handles the cases that are valid for all block drivers, namely | |
2061 | // exactly sequential writes and overlapping writes. | |
2062 | if (reqs[i].sector <= oldreq_last) { | |
2063 | merge = 1; | |
2064 | } | |
2065 | ||
2066 | // The block driver may decide that it makes sense to combine requests | |
2067 | // even if there is a gap of some sectors between them. In this case, | |
2068 | // the gap is filled with zeros (therefore only applicable for yet | |
2069 | // unused space in format like qcow2). | |
2070 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2071 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2072 | } | |
2073 | ||
e2a305fb CH |
2074 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2075 | merge = 0; | |
2076 | } | |
2077 | ||
40b4f539 KW |
2078 | if (merge) { |
2079 | size_t size; | |
2080 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
2081 | qemu_iovec_init(qiov, | |
2082 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2083 | ||
2084 | // Add the first request to the merged one. If the requests are | |
2085 | // overlapping, drop the last sectors of the first request. | |
2086 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2087 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2088 | ||
2089 | // We might need to add some zeros between the two requests | |
2090 | if (reqs[i].sector > oldreq_last) { | |
2091 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2092 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2093 | memset(buf, 0, zero_bytes); | |
2094 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2095 | mcb->callbacks[i].free_buf = buf; | |
2096 | } | |
2097 | ||
2098 | // Add the second request | |
2099 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2100 | ||
cbf1dff2 | 2101 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
2102 | reqs[outidx].qiov = qiov; |
2103 | ||
2104 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2105 | } else { | |
2106 | outidx++; | |
2107 | reqs[outidx].sector = reqs[i].sector; | |
2108 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2109 | reqs[outidx].qiov = reqs[i].qiov; | |
2110 | } | |
2111 | } | |
2112 | ||
2113 | return outidx + 1; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * Submit multiple AIO write requests at once. | |
2118 | * | |
2119 | * On success, the function returns 0 and all requests in the reqs array have | |
2120 | * been submitted. In error case this function returns -1, and any of the | |
2121 | * requests may or may not be submitted yet. In particular, this means that the | |
2122 | * callback will be called for some of the requests, for others it won't. The | |
2123 | * caller must check the error field of the BlockRequest to wait for the right | |
2124 | * callbacks (if error != 0, no callback will be called). | |
2125 | * | |
2126 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2127 | * requests. However, the fields opaque and error are left unmodified as they | |
2128 | * are used to signal failure for a single request to the caller. | |
2129 | */ | |
2130 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2131 | { | |
2132 | BlockDriverAIOCB *acb; | |
2133 | MultiwriteCB *mcb; | |
2134 | int i; | |
2135 | ||
2136 | if (num_reqs == 0) { | |
2137 | return 0; | |
2138 | } | |
2139 | ||
2140 | // Create MultiwriteCB structure | |
2141 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2142 | mcb->num_requests = 0; | |
2143 | mcb->num_callbacks = num_reqs; | |
2144 | ||
2145 | for (i = 0; i < num_reqs; i++) { | |
2146 | mcb->callbacks[i].cb = reqs[i].cb; | |
2147 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2148 | } | |
2149 | ||
2150 | // Check for mergable requests | |
2151 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2152 | ||
2153 | // Run the aio requests | |
2154 | for (i = 0; i < num_reqs; i++) { | |
2155 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2156 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2157 | ||
2158 | if (acb == NULL) { | |
2159 | // We can only fail the whole thing if no request has been | |
2160 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2161 | // complete and report the error in the callback. | |
2162 | if (mcb->num_requests == 0) { | |
0f0b604b | 2163 | reqs[i].error = -EIO; |
40b4f539 KW |
2164 | goto fail; |
2165 | } else { | |
7eb58a6c KW |
2166 | mcb->num_requests++; |
2167 | multiwrite_cb(mcb, -EIO); | |
40b4f539 KW |
2168 | break; |
2169 | } | |
2170 | } else { | |
2171 | mcb->num_requests++; | |
2172 | } | |
2173 | } | |
2174 | ||
2175 | return 0; | |
2176 | ||
2177 | fail: | |
af474591 | 2178 | qemu_free(mcb); |
40b4f539 KW |
2179 | return -1; |
2180 | } | |
2181 | ||
b2e12bc6 CH |
2182 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2183 | BlockDriverCompletionFunc *cb, void *opaque) | |
2184 | { | |
2185 | BlockDriver *drv = bs->drv; | |
2186 | ||
016f5cf6 AG |
2187 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
2188 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2189 | } | |
2190 | ||
b2e12bc6 CH |
2191 | if (!drv) |
2192 | return NULL; | |
b2e12bc6 CH |
2193 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2194 | } | |
2195 | ||
83f64091 | 2196 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2197 | { |
6bbff9a0 | 2198 | acb->pool->cancel(acb); |
83f64091 FB |
2199 | } |
2200 | ||
ce1a14dc | 2201 | |
83f64091 FB |
2202 | /**************************************************************/ |
2203 | /* async block device emulation */ | |
2204 | ||
c16b5a2c CH |
2205 | typedef struct BlockDriverAIOCBSync { |
2206 | BlockDriverAIOCB common; | |
2207 | QEMUBH *bh; | |
2208 | int ret; | |
2209 | /* vector translation state */ | |
2210 | QEMUIOVector *qiov; | |
2211 | uint8_t *bounce; | |
2212 | int is_write; | |
2213 | } BlockDriverAIOCBSync; | |
2214 | ||
2215 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2216 | { | |
b666d239 KW |
2217 | BlockDriverAIOCBSync *acb = |
2218 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 2219 | qemu_bh_delete(acb->bh); |
36afc451 | 2220 | acb->bh = NULL; |
c16b5a2c CH |
2221 | qemu_aio_release(acb); |
2222 | } | |
2223 | ||
2224 | static AIOPool bdrv_em_aio_pool = { | |
2225 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2226 | .cancel = bdrv_aio_cancel_em, | |
2227 | }; | |
2228 | ||
ce1a14dc | 2229 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2230 | { |
ce1a14dc | 2231 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2232 | |
f141eafe AL |
2233 | if (!acb->is_write) |
2234 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2235 | qemu_vfree(acb->bounce); |
ce1a14dc | 2236 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2237 | qemu_bh_delete(acb->bh); |
36afc451 | 2238 | acb->bh = NULL; |
ce1a14dc | 2239 | qemu_aio_release(acb); |
83f64091 | 2240 | } |
beac80cd | 2241 | |
f141eafe AL |
2242 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2243 | int64_t sector_num, | |
2244 | QEMUIOVector *qiov, | |
2245 | int nb_sectors, | |
2246 | BlockDriverCompletionFunc *cb, | |
2247 | void *opaque, | |
2248 | int is_write) | |
2249 | ||
83f64091 | 2250 | { |
ce1a14dc | 2251 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2252 | |
c16b5a2c | 2253 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2254 | acb->is_write = is_write; |
2255 | acb->qiov = qiov; | |
e268ca52 | 2256 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2257 | |
ce1a14dc PB |
2258 | if (!acb->bh) |
2259 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2260 | |
2261 | if (is_write) { | |
2262 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2263 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2264 | } else { | |
2265 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2266 | } | |
2267 | ||
ce1a14dc | 2268 | qemu_bh_schedule(acb->bh); |
f141eafe | 2269 | |
ce1a14dc | 2270 | return &acb->common; |
beac80cd FB |
2271 | } |
2272 | ||
f141eafe AL |
2273 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2274 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2275 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2276 | { |
f141eafe AL |
2277 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2278 | } | |
83f64091 | 2279 | |
f141eafe AL |
2280 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2281 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2282 | BlockDriverCompletionFunc *cb, void *opaque) | |
2283 | { | |
2284 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2285 | } |
beac80cd | 2286 | |
b2e12bc6 CH |
2287 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2288 | BlockDriverCompletionFunc *cb, void *opaque) | |
2289 | { | |
2290 | BlockDriverAIOCBSync *acb; | |
2291 | ||
2292 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2293 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2294 | acb->qiov = NULL; | |
2295 | acb->bounce = NULL; | |
2296 | acb->ret = 0; | |
2297 | ||
2298 | if (!acb->bh) | |
2299 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2300 | ||
2301 | bdrv_flush(bs); | |
2302 | qemu_bh_schedule(acb->bh); | |
2303 | return &acb->common; | |
2304 | } | |
2305 | ||
016f5cf6 AG |
2306 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
2307 | BlockDriverCompletionFunc *cb, void *opaque) | |
2308 | { | |
2309 | BlockDriverAIOCBSync *acb; | |
2310 | ||
2311 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2312 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2313 | acb->qiov = NULL; | |
2314 | acb->bounce = NULL; | |
2315 | acb->ret = 0; | |
2316 | ||
2317 | if (!acb->bh) { | |
2318 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2319 | } | |
2320 | ||
2321 | qemu_bh_schedule(acb->bh); | |
2322 | return &acb->common; | |
2323 | } | |
2324 | ||
83f64091 FB |
2325 | /**************************************************************/ |
2326 | /* sync block device emulation */ | |
ea2384d3 | 2327 | |
83f64091 FB |
2328 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2329 | { | |
2330 | *(int *)opaque = ret; | |
ea2384d3 FB |
2331 | } |
2332 | ||
83f64091 FB |
2333 | #define NOT_DONE 0x7fffffff |
2334 | ||
5fafdf24 | 2335 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2336 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2337 | { |
ce1a14dc PB |
2338 | int async_ret; |
2339 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2340 | struct iovec iov; |
2341 | QEMUIOVector qiov; | |
83f64091 | 2342 | |
65d6b3d8 KW |
2343 | async_context_push(); |
2344 | ||
83f64091 | 2345 | async_ret = NOT_DONE; |
3f4cb3d3 | 2346 | iov.iov_base = (void *)buf; |
eb5a3165 | 2347 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2348 | qemu_iovec_init_external(&qiov, &iov, 1); |
2349 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2350 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2351 | if (acb == NULL) { |
2352 | async_ret = -1; | |
2353 | goto fail; | |
2354 | } | |
baf35cb9 | 2355 | |
83f64091 FB |
2356 | while (async_ret == NOT_DONE) { |
2357 | qemu_aio_wait(); | |
2358 | } | |
baf35cb9 | 2359 | |
65d6b3d8 KW |
2360 | |
2361 | fail: | |
2362 | async_context_pop(); | |
83f64091 | 2363 | return async_ret; |
7a6cba61 PB |
2364 | } |
2365 | ||
83f64091 FB |
2366 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2367 | const uint8_t *buf, int nb_sectors) | |
2368 | { | |
ce1a14dc PB |
2369 | int async_ret; |
2370 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2371 | struct iovec iov; |
2372 | QEMUIOVector qiov; | |
83f64091 | 2373 | |
65d6b3d8 KW |
2374 | async_context_push(); |
2375 | ||
83f64091 | 2376 | async_ret = NOT_DONE; |
f141eafe | 2377 | iov.iov_base = (void *)buf; |
eb5a3165 | 2378 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2379 | qemu_iovec_init_external(&qiov, &iov, 1); |
2380 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2381 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2382 | if (acb == NULL) { |
2383 | async_ret = -1; | |
2384 | goto fail; | |
2385 | } | |
83f64091 FB |
2386 | while (async_ret == NOT_DONE) { |
2387 | qemu_aio_wait(); | |
2388 | } | |
65d6b3d8 KW |
2389 | |
2390 | fail: | |
2391 | async_context_pop(); | |
83f64091 FB |
2392 | return async_ret; |
2393 | } | |
ea2384d3 FB |
2394 | |
2395 | void bdrv_init(void) | |
2396 | { | |
5efa9d5a | 2397 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2398 | } |
ce1a14dc | 2399 | |
eb852011 MA |
2400 | void bdrv_init_with_whitelist(void) |
2401 | { | |
2402 | use_bdrv_whitelist = 1; | |
2403 | bdrv_init(); | |
2404 | } | |
2405 | ||
c16b5a2c CH |
2406 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2407 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2408 | { |
ce1a14dc PB |
2409 | BlockDriverAIOCB *acb; |
2410 | ||
6bbff9a0 AL |
2411 | if (pool->free_aiocb) { |
2412 | acb = pool->free_aiocb; | |
2413 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2414 | } else { |
6bbff9a0 AL |
2415 | acb = qemu_mallocz(pool->aiocb_size); |
2416 | acb->pool = pool; | |
ce1a14dc PB |
2417 | } |
2418 | acb->bs = bs; | |
2419 | acb->cb = cb; | |
2420 | acb->opaque = opaque; | |
2421 | return acb; | |
2422 | } | |
2423 | ||
2424 | void qemu_aio_release(void *p) | |
2425 | { | |
6bbff9a0 AL |
2426 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2427 | AIOPool *pool = acb->pool; | |
2428 | acb->next = pool->free_aiocb; | |
2429 | pool->free_aiocb = acb; | |
ce1a14dc | 2430 | } |
19cb3738 FB |
2431 | |
2432 | /**************************************************************/ | |
2433 | /* removable device support */ | |
2434 | ||
2435 | /** | |
2436 | * Return TRUE if the media is present | |
2437 | */ | |
2438 | int bdrv_is_inserted(BlockDriverState *bs) | |
2439 | { | |
2440 | BlockDriver *drv = bs->drv; | |
2441 | int ret; | |
2442 | if (!drv) | |
2443 | return 0; | |
2444 | if (!drv->bdrv_is_inserted) | |
2445 | return 1; | |
2446 | ret = drv->bdrv_is_inserted(bs); | |
2447 | return ret; | |
2448 | } | |
2449 | ||
2450 | /** | |
2451 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2452 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2453 | */ |
2454 | int bdrv_media_changed(BlockDriverState *bs) | |
2455 | { | |
2456 | BlockDriver *drv = bs->drv; | |
2457 | int ret; | |
2458 | ||
2459 | if (!drv || !drv->bdrv_media_changed) | |
2460 | ret = -ENOTSUP; | |
2461 | else | |
2462 | ret = drv->bdrv_media_changed(bs); | |
2463 | if (ret == -ENOTSUP) | |
2464 | ret = bs->media_changed; | |
2465 | bs->media_changed = 0; | |
2466 | return ret; | |
2467 | } | |
2468 | ||
2469 | /** | |
2470 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2471 | */ | |
aea2a33c | 2472 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2473 | { |
2474 | BlockDriver *drv = bs->drv; | |
2475 | int ret; | |
2476 | ||
aea2a33c MM |
2477 | if (bs->locked) { |
2478 | return -EBUSY; | |
2479 | } | |
2480 | ||
19cb3738 FB |
2481 | if (!drv || !drv->bdrv_eject) { |
2482 | ret = -ENOTSUP; | |
2483 | } else { | |
2484 | ret = drv->bdrv_eject(bs, eject_flag); | |
2485 | } | |
2486 | if (ret == -ENOTSUP) { | |
2487 | if (eject_flag) | |
2488 | bdrv_close(bs); | |
aea2a33c | 2489 | ret = 0; |
19cb3738 | 2490 | } |
aea2a33c MM |
2491 | |
2492 | return ret; | |
19cb3738 FB |
2493 | } |
2494 | ||
2495 | int bdrv_is_locked(BlockDriverState *bs) | |
2496 | { | |
2497 | return bs->locked; | |
2498 | } | |
2499 | ||
2500 | /** | |
2501 | * Lock or unlock the media (if it is locked, the user won't be able | |
2502 | * to eject it manually). | |
2503 | */ | |
2504 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2505 | { | |
2506 | BlockDriver *drv = bs->drv; | |
2507 | ||
2508 | bs->locked = locked; | |
2509 | if (drv && drv->bdrv_set_locked) { | |
2510 | drv->bdrv_set_locked(bs, locked); | |
2511 | } | |
2512 | } | |
985a03b0 TS |
2513 | |
2514 | /* needed for generic scsi interface */ | |
2515 | ||
2516 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2517 | { | |
2518 | BlockDriver *drv = bs->drv; | |
2519 | ||
2520 | if (drv && drv->bdrv_ioctl) | |
2521 | return drv->bdrv_ioctl(bs, req, buf); | |
2522 | return -ENOTSUP; | |
2523 | } | |
7d780669 | 2524 | |
221f715d AL |
2525 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2526 | unsigned long int req, void *buf, | |
2527 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2528 | { |
221f715d | 2529 | BlockDriver *drv = bs->drv; |
7d780669 | 2530 | |
221f715d AL |
2531 | if (drv && drv->bdrv_aio_ioctl) |
2532 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2533 | return NULL; | |
7d780669 | 2534 | } |
e268ca52 | 2535 | |
7cd1e32a | 2536 | |
2537 | ||
e268ca52 AL |
2538 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2539 | { | |
2540 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2541 | } | |
7cd1e32a | 2542 | |
2543 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2544 | { | |
2545 | int64_t bitmap_size; | |
a55eb92c | 2546 | |
aaa0eb75 | 2547 | bs->dirty_count = 0; |
a55eb92c | 2548 | if (enable) { |
c6d22830 JK |
2549 | if (!bs->dirty_bitmap) { |
2550 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2551 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2552 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2553 | |
7cd1e32a | 2554 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2555 | } |
7cd1e32a | 2556 | } else { |
c6d22830 | 2557 | if (bs->dirty_bitmap) { |
7cd1e32a | 2558 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2559 | bs->dirty_bitmap = NULL; |
a55eb92c | 2560 | } |
7cd1e32a | 2561 | } |
2562 | } | |
2563 | ||
2564 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2565 | { | |
6ea44308 | 2566 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2567 | |
c6d22830 JK |
2568 | if (bs->dirty_bitmap && |
2569 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2570 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2571 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2572 | } else { |
2573 | return 0; | |
2574 | } | |
2575 | } | |
2576 | ||
a55eb92c JK |
2577 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2578 | int nr_sectors) | |
7cd1e32a | 2579 | { |
2580 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2581 | } | |
aaa0eb75 LS |
2582 | |
2583 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2584 | { | |
2585 | return bs->dirty_count; | |
2586 | } |