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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 | |
f9092b10 MA |
66 | /* The device to use for VM snapshots */ |
67 | static BlockDriverState *bs_snapshots; | |
68 | ||
eb852011 MA |
69 | /* If non-zero, use only whitelisted block drivers */ |
70 | static int use_bdrv_whitelist; | |
71 | ||
83f64091 | 72 | int path_is_absolute(const char *path) |
3b0d4f61 | 73 | { |
83f64091 | 74 | const char *p; |
21664424 FB |
75 | #ifdef _WIN32 |
76 | /* specific case for names like: "\\.\d:" */ | |
77 | if (*path == '/' || *path == '\\') | |
78 | return 1; | |
79 | #endif | |
83f64091 FB |
80 | p = strchr(path, ':'); |
81 | if (p) | |
82 | p++; | |
83 | else | |
84 | p = path; | |
3b9f94e1 FB |
85 | #ifdef _WIN32 |
86 | return (*p == '/' || *p == '\\'); | |
87 | #else | |
88 | return (*p == '/'); | |
89 | #endif | |
3b0d4f61 FB |
90 | } |
91 | ||
83f64091 FB |
92 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
93 | path to it by considering it is relative to base_path. URL are | |
94 | supported. */ | |
95 | void path_combine(char *dest, int dest_size, | |
96 | const char *base_path, | |
97 | const char *filename) | |
3b0d4f61 | 98 | { |
83f64091 FB |
99 | const char *p, *p1; |
100 | int len; | |
101 | ||
102 | if (dest_size <= 0) | |
103 | return; | |
104 | if (path_is_absolute(filename)) { | |
105 | pstrcpy(dest, dest_size, filename); | |
106 | } else { | |
107 | p = strchr(base_path, ':'); | |
108 | if (p) | |
109 | p++; | |
110 | else | |
111 | p = base_path; | |
3b9f94e1 FB |
112 | p1 = strrchr(base_path, '/'); |
113 | #ifdef _WIN32 | |
114 | { | |
115 | const char *p2; | |
116 | p2 = strrchr(base_path, '\\'); | |
117 | if (!p1 || p2 > p1) | |
118 | p1 = p2; | |
119 | } | |
120 | #endif | |
83f64091 FB |
121 | if (p1) |
122 | p1++; | |
123 | else | |
124 | p1 = base_path; | |
125 | if (p1 > p) | |
126 | p = p1; | |
127 | len = p - base_path; | |
128 | if (len > dest_size - 1) | |
129 | len = dest_size - 1; | |
130 | memcpy(dest, base_path, len); | |
131 | dest[len] = '\0'; | |
132 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 133 | } |
3b0d4f61 FB |
134 | } |
135 | ||
5efa9d5a | 136 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 137 | { |
f141eafe | 138 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 139 | /* add AIO emulation layer */ |
f141eafe AL |
140 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
141 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 142 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
143 | /* add synchronous IO emulation layer */ |
144 | bdrv->bdrv_read = bdrv_read_em; | |
145 | bdrv->bdrv_write = bdrv_write_em; | |
146 | } | |
b2e12bc6 CH |
147 | |
148 | if (!bdrv->bdrv_aio_flush) | |
149 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
150 | ||
8a22f02a | 151 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 152 | } |
b338082b FB |
153 | |
154 | /* create a new block device (by default it is empty) */ | |
155 | BlockDriverState *bdrv_new(const char *device_name) | |
156 | { | |
1b7bdbc1 | 157 | BlockDriverState *bs; |
b338082b FB |
158 | |
159 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 160 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 161 | if (device_name[0] != '\0') { |
1b7bdbc1 | 162 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 163 | } |
b338082b FB |
164 | return bs; |
165 | } | |
166 | ||
ea2384d3 FB |
167 | BlockDriver *bdrv_find_format(const char *format_name) |
168 | { | |
169 | BlockDriver *drv1; | |
8a22f02a SH |
170 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
171 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 172 | return drv1; |
8a22f02a | 173 | } |
ea2384d3 FB |
174 | } |
175 | return NULL; | |
176 | } | |
177 | ||
eb852011 MA |
178 | static int bdrv_is_whitelisted(BlockDriver *drv) |
179 | { | |
180 | static const char *whitelist[] = { | |
181 | CONFIG_BDRV_WHITELIST | |
182 | }; | |
183 | const char **p; | |
184 | ||
185 | if (!whitelist[0]) | |
186 | return 1; /* no whitelist, anything goes */ | |
187 | ||
188 | for (p = whitelist; *p; p++) { | |
189 | if (!strcmp(drv->format_name, *p)) { | |
190 | return 1; | |
191 | } | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | ||
196 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
197 | { | |
198 | BlockDriver *drv = bdrv_find_format(format_name); | |
199 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
200 | } | |
201 | ||
0e7e1989 KW |
202 | int bdrv_create(BlockDriver *drv, const char* filename, |
203 | QEMUOptionParameter *options) | |
ea2384d3 FB |
204 | { |
205 | if (!drv->bdrv_create) | |
206 | return -ENOTSUP; | |
0e7e1989 KW |
207 | |
208 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
209 | } |
210 | ||
84a12e66 CH |
211 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
212 | { | |
213 | BlockDriver *drv; | |
214 | ||
b50cbabc | 215 | drv = bdrv_find_protocol(filename); |
84a12e66 CH |
216 | if (drv == NULL) { |
217 | drv = bdrv_find_format("file"); | |
218 | } | |
219 | ||
220 | return bdrv_create(drv, filename, options); | |
221 | } | |
222 | ||
d5249393 | 223 | #ifdef _WIN32 |
95389c86 | 224 | void get_tmp_filename(char *filename, int size) |
d5249393 | 225 | { |
3b9f94e1 | 226 | char temp_dir[MAX_PATH]; |
3b46e624 | 227 | |
3b9f94e1 FB |
228 | GetTempPath(MAX_PATH, temp_dir); |
229 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
230 | } |
231 | #else | |
95389c86 | 232 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 233 | { |
67b915a5 | 234 | int fd; |
7ccfb2eb | 235 | const char *tmpdir; |
d5249393 | 236 | /* XXX: race condition possible */ |
0badc1ee AJ |
237 | tmpdir = getenv("TMPDIR"); |
238 | if (!tmpdir) | |
239 | tmpdir = "/tmp"; | |
240 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
241 | fd = mkstemp(filename); |
242 | close(fd); | |
243 | } | |
d5249393 | 244 | #endif |
fc01f7e7 | 245 | |
19cb3738 | 246 | #ifdef _WIN32 |
f45512fe FB |
247 | static int is_windows_drive_prefix(const char *filename) |
248 | { | |
249 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
250 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
251 | filename[1] == ':'); | |
252 | } | |
3b46e624 | 253 | |
508c7cb3 | 254 | int is_windows_drive(const char *filename) |
19cb3738 | 255 | { |
5fafdf24 | 256 | if (is_windows_drive_prefix(filename) && |
f45512fe | 257 | filename[2] == '\0') |
19cb3738 FB |
258 | return 1; |
259 | if (strstart(filename, "\\\\.\\", NULL) || | |
260 | strstart(filename, "//./", NULL)) | |
261 | return 1; | |
262 | return 0; | |
263 | } | |
264 | #endif | |
265 | ||
84a12e66 CH |
266 | /* |
267 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
268 | * recognized as a host CDROM. | |
269 | */ | |
270 | static BlockDriver *find_hdev_driver(const char *filename) | |
271 | { | |
272 | int score_max = 0, score; | |
273 | BlockDriver *drv = NULL, *d; | |
274 | ||
275 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
276 | if (d->bdrv_probe_device) { | |
277 | score = d->bdrv_probe_device(filename); | |
278 | if (score > score_max) { | |
279 | score_max = score; | |
280 | drv = d; | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | return drv; | |
286 | } | |
287 | ||
b50cbabc | 288 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
289 | { |
290 | BlockDriver *drv1; | |
291 | char protocol[128]; | |
1cec71e3 | 292 | int len; |
83f64091 | 293 | const char *p; |
19cb3738 | 294 | |
66f82cee KW |
295 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
296 | ||
39508e7a CH |
297 | /* |
298 | * XXX(hch): we really should not let host device detection | |
299 | * override an explicit protocol specification, but moving this | |
300 | * later breaks access to device names with colons in them. | |
301 | * Thanks to the brain-dead persistent naming schemes on udev- | |
302 | * based Linux systems those actually are quite common. | |
303 | */ | |
304 | drv1 = find_hdev_driver(filename); | |
305 | if (drv1) { | |
306 | return drv1; | |
307 | } | |
308 | ||
19cb3738 | 309 | #ifdef _WIN32 |
39508e7a CH |
310 | if (is_windows_drive(filename) || |
311 | is_windows_drive_prefix(filename)) | |
312 | return bdrv_find_format("file"); | |
19cb3738 | 313 | #endif |
39508e7a | 314 | |
1cec71e3 | 315 | p = strchr(filename, ':'); |
39508e7a CH |
316 | if (!p) { |
317 | return bdrv_find_format("file"); | |
84a12e66 | 318 | } |
1cec71e3 AL |
319 | len = p - filename; |
320 | if (len > sizeof(protocol) - 1) | |
321 | len = sizeof(protocol) - 1; | |
322 | memcpy(protocol, filename, len); | |
323 | protocol[len] = '\0'; | |
8a22f02a | 324 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 325 | if (drv1->protocol_name && |
8a22f02a | 326 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 327 | return drv1; |
8a22f02a | 328 | } |
83f64091 FB |
329 | } |
330 | return NULL; | |
331 | } | |
332 | ||
32b8bb3b | 333 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
334 | { |
335 | int ret, score, score_max; | |
336 | BlockDriver *drv1, *drv; | |
337 | uint8_t buf[2048]; | |
338 | BlockDriverState *bs; | |
339 | ||
f5edb014 | 340 | ret = bdrv_file_open(&bs, filename, 0); |
32b8bb3b SW |
341 | if (ret < 0) { |
342 | *pdrv = NULL; | |
343 | return ret; | |
344 | } | |
f8ea0b00 | 345 | |
08a00559 KW |
346 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
347 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 348 | bdrv_delete(bs); |
32b8bb3b SW |
349 | drv = bdrv_find_format("raw"); |
350 | if (!drv) { | |
351 | ret = -ENOENT; | |
352 | } | |
353 | *pdrv = drv; | |
354 | return ret; | |
1a396859 | 355 | } |
f8ea0b00 | 356 | |
83f64091 FB |
357 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
358 | bdrv_delete(bs); | |
359 | if (ret < 0) { | |
32b8bb3b SW |
360 | *pdrv = NULL; |
361 | return ret; | |
83f64091 FB |
362 | } |
363 | ||
ea2384d3 | 364 | score_max = 0; |
84a12e66 | 365 | drv = NULL; |
8a22f02a | 366 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
367 | if (drv1->bdrv_probe) { |
368 | score = drv1->bdrv_probe(buf, ret, filename); | |
369 | if (score > score_max) { | |
370 | score_max = score; | |
371 | drv = drv1; | |
372 | } | |
0849bf08 | 373 | } |
fc01f7e7 | 374 | } |
32b8bb3b SW |
375 | if (!drv) { |
376 | ret = -ENOENT; | |
377 | } | |
378 | *pdrv = drv; | |
379 | return ret; | |
ea2384d3 FB |
380 | } |
381 | ||
51762288 SH |
382 | /** |
383 | * Set the current 'total_sectors' value | |
384 | */ | |
385 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
386 | { | |
387 | BlockDriver *drv = bs->drv; | |
388 | ||
396759ad NB |
389 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
390 | if (bs->sg) | |
391 | return 0; | |
392 | ||
51762288 SH |
393 | /* query actual device if possible, otherwise just trust the hint */ |
394 | if (drv->bdrv_getlength) { | |
395 | int64_t length = drv->bdrv_getlength(bs); | |
396 | if (length < 0) { | |
397 | return length; | |
398 | } | |
399 | hint = length >> BDRV_SECTOR_BITS; | |
400 | } | |
401 | ||
402 | bs->total_sectors = hint; | |
403 | return 0; | |
404 | } | |
405 | ||
57915332 KW |
406 | /* |
407 | * Common part for opening disk images and files | |
408 | */ | |
409 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
410 | int flags, BlockDriver *drv) | |
411 | { | |
412 | int ret, open_flags; | |
413 | ||
414 | assert(drv != NULL); | |
415 | ||
66f82cee | 416 | bs->file = NULL; |
51762288 | 417 | bs->total_sectors = 0; |
57915332 KW |
418 | bs->encrypted = 0; |
419 | bs->valid_key = 0; | |
420 | bs->open_flags = flags; | |
421 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
422 | bs->buffer_alignment = 512; | |
423 | ||
424 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
425 | ||
426 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
427 | return -ENOTSUP; | |
428 | } | |
429 | ||
430 | bs->drv = drv; | |
431 | bs->opaque = qemu_mallocz(drv->instance_size); | |
432 | ||
433 | /* | |
434 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
435 | * write cache to the guest. We do need the fdatasync to flush | |
436 | * out transactions for block allocations, and we maybe have a | |
437 | * volatile write cache in our backing device to deal with. | |
438 | */ | |
439 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
440 | bs->enable_write_cache = 1; | |
441 | ||
442 | /* | |
443 | * Clear flags that are internal to the block layer before opening the | |
444 | * image. | |
445 | */ | |
446 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
447 | ||
448 | /* | |
449 | * Snapshots should be writeable. | |
450 | */ | |
451 | if (bs->is_temporary) { | |
452 | open_flags |= BDRV_O_RDWR; | |
453 | } | |
454 | ||
66f82cee KW |
455 | /* Open the image, either directly or using a protocol */ |
456 | if (drv->bdrv_file_open) { | |
457 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
458 | } else { | |
459 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
460 | if (ret >= 0) { | |
461 | ret = drv->bdrv_open(bs, open_flags); | |
462 | } | |
463 | } | |
464 | ||
57915332 KW |
465 | if (ret < 0) { |
466 | goto free_and_fail; | |
467 | } | |
468 | ||
469 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
470 | |
471 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
472 | if (ret < 0) { | |
473 | goto free_and_fail; | |
57915332 | 474 | } |
51762288 | 475 | |
57915332 KW |
476 | #ifndef _WIN32 |
477 | if (bs->is_temporary) { | |
478 | unlink(filename); | |
479 | } | |
480 | #endif | |
481 | return 0; | |
482 | ||
483 | free_and_fail: | |
66f82cee KW |
484 | if (bs->file) { |
485 | bdrv_delete(bs->file); | |
486 | bs->file = NULL; | |
487 | } | |
57915332 KW |
488 | qemu_free(bs->opaque); |
489 | bs->opaque = NULL; | |
490 | bs->drv = NULL; | |
491 | return ret; | |
492 | } | |
493 | ||
b6ce07aa KW |
494 | /* |
495 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
496 | */ | |
83f64091 | 497 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 498 | { |
83f64091 | 499 | BlockDriverState *bs; |
6db95603 | 500 | BlockDriver *drv; |
83f64091 FB |
501 | int ret; |
502 | ||
b50cbabc | 503 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
504 | if (!drv) { |
505 | return -ENOENT; | |
506 | } | |
507 | ||
83f64091 | 508 | bs = bdrv_new(""); |
b6ce07aa | 509 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
510 | if (ret < 0) { |
511 | bdrv_delete(bs); | |
512 | return ret; | |
3b0d4f61 | 513 | } |
71d0770c | 514 | bs->growable = 1; |
83f64091 FB |
515 | *pbs = bs; |
516 | return 0; | |
517 | } | |
518 | ||
b6ce07aa KW |
519 | /* |
520 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
521 | */ | |
d6e9098e KW |
522 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
523 | BlockDriver *drv) | |
ea2384d3 | 524 | { |
b6ce07aa | 525 | int ret; |
79368c81 | 526 | int probed = 0; |
712e7874 | 527 | |
83f64091 | 528 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
529 | BlockDriverState *bs1; |
530 | int64_t total_size; | |
7c96d46e | 531 | int is_protocol = 0; |
91a073a9 KW |
532 | BlockDriver *bdrv_qcow2; |
533 | QEMUOptionParameter *options; | |
b6ce07aa KW |
534 | char tmp_filename[PATH_MAX]; |
535 | char backing_filename[PATH_MAX]; | |
3b46e624 | 536 | |
ea2384d3 FB |
537 | /* if snapshot, we create a temporary backing file and open it |
538 | instead of opening 'filename' directly */ | |
33e3963e | 539 | |
ea2384d3 FB |
540 | /* if there is a backing file, use it */ |
541 | bs1 = bdrv_new(""); | |
d6e9098e | 542 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 543 | if (ret < 0) { |
ea2384d3 | 544 | bdrv_delete(bs1); |
51d7c00c | 545 | return ret; |
ea2384d3 | 546 | } |
3e82990b | 547 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
548 | |
549 | if (bs1->drv && bs1->drv->protocol_name) | |
550 | is_protocol = 1; | |
551 | ||
ea2384d3 | 552 | bdrv_delete(bs1); |
3b46e624 | 553 | |
ea2384d3 | 554 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
555 | |
556 | /* Real path is meaningless for protocols */ | |
557 | if (is_protocol) | |
558 | snprintf(backing_filename, sizeof(backing_filename), | |
559 | "%s", filename); | |
114cdfa9 KS |
560 | else if (!realpath(filename, backing_filename)) |
561 | return -errno; | |
7c96d46e | 562 | |
91a073a9 KW |
563 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
564 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
565 | ||
3e82990b | 566 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
567 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
568 | if (drv) { | |
569 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
570 | drv->format_name); | |
571 | } | |
572 | ||
573 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 574 | free_option_parameters(options); |
51d7c00c AL |
575 | if (ret < 0) { |
576 | return ret; | |
ea2384d3 | 577 | } |
91a073a9 | 578 | |
ea2384d3 | 579 | filename = tmp_filename; |
91a073a9 | 580 | drv = bdrv_qcow2; |
ea2384d3 FB |
581 | bs->is_temporary = 1; |
582 | } | |
712e7874 | 583 | |
b6ce07aa | 584 | /* Find the right image format driver */ |
6db95603 | 585 | if (!drv) { |
32b8bb3b | 586 | ret = find_image_format(filename, &drv); |
79368c81 | 587 | probed = 1; |
51d7c00c | 588 | } |
6987307c | 589 | |
51d7c00c | 590 | if (!drv) { |
51d7c00c | 591 | goto unlink_and_fail; |
ea2384d3 | 592 | } |
b6ce07aa KW |
593 | |
594 | /* Open the image */ | |
595 | ret = bdrv_open_common(bs, filename, flags, drv); | |
596 | if (ret < 0) { | |
6987307c CH |
597 | goto unlink_and_fail; |
598 | } | |
599 | ||
79368c81 AL |
600 | bs->probed = probed; |
601 | ||
b6ce07aa KW |
602 | /* If there is a backing file, use it */ |
603 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
604 | char backing_filename[PATH_MAX]; | |
605 | int back_flags; | |
606 | BlockDriver *back_drv = NULL; | |
607 | ||
608 | bs->backing_hd = bdrv_new(""); | |
609 | path_combine(backing_filename, sizeof(backing_filename), | |
610 | filename, bs->backing_file); | |
611 | if (bs->backing_format[0] != '\0') | |
612 | back_drv = bdrv_find_format(bs->backing_format); | |
613 | ||
614 | /* backing files always opened read-only */ | |
615 | back_flags = | |
616 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
617 | ||
618 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
619 | if (ret < 0) { | |
620 | bdrv_close(bs); | |
621 | return ret; | |
622 | } | |
623 | if (bs->is_temporary) { | |
624 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
625 | } else { | |
626 | /* base image inherits from "parent" */ | |
627 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
628 | } | |
629 | } | |
630 | ||
631 | if (!bdrv_key_required(bs)) { | |
632 | /* call the change callback */ | |
633 | bs->media_changed = 1; | |
634 | if (bs->change_cb) | |
635 | bs->change_cb(bs->change_opaque); | |
636 | } | |
637 | ||
638 | return 0; | |
639 | ||
640 | unlink_and_fail: | |
641 | if (bs->is_temporary) { | |
642 | unlink(filename); | |
643 | } | |
644 | return ret; | |
645 | } | |
646 | ||
fc01f7e7 FB |
647 | void bdrv_close(BlockDriverState *bs) |
648 | { | |
19cb3738 | 649 | if (bs->drv) { |
f9092b10 MA |
650 | if (bs == bs_snapshots) { |
651 | bs_snapshots = NULL; | |
652 | } | |
557df6ac | 653 | if (bs->backing_hd) { |
ea2384d3 | 654 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
655 | bs->backing_hd = NULL; |
656 | } | |
ea2384d3 FB |
657 | bs->drv->bdrv_close(bs); |
658 | qemu_free(bs->opaque); | |
659 | #ifdef _WIN32 | |
660 | if (bs->is_temporary) { | |
661 | unlink(bs->filename); | |
662 | } | |
67b915a5 | 663 | #endif |
ea2384d3 FB |
664 | bs->opaque = NULL; |
665 | bs->drv = NULL; | |
b338082b | 666 | |
66f82cee KW |
667 | if (bs->file != NULL) { |
668 | bdrv_close(bs->file); | |
669 | } | |
670 | ||
b338082b | 671 | /* call the change callback */ |
19cb3738 | 672 | bs->media_changed = 1; |
b338082b FB |
673 | if (bs->change_cb) |
674 | bs->change_cb(bs->change_opaque); | |
675 | } | |
676 | } | |
677 | ||
2bc93fed MK |
678 | void bdrv_close_all(void) |
679 | { | |
680 | BlockDriverState *bs; | |
681 | ||
682 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
683 | bdrv_close(bs); | |
684 | } | |
685 | } | |
686 | ||
b338082b FB |
687 | void bdrv_delete(BlockDriverState *bs) |
688 | { | |
18846dee MA |
689 | assert(!bs->peer); |
690 | ||
1b7bdbc1 SH |
691 | /* remove from list, if necessary */ |
692 | if (bs->device_name[0] != '\0') { | |
693 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
694 | } | |
34c6f050 | 695 | |
b338082b | 696 | bdrv_close(bs); |
66f82cee KW |
697 | if (bs->file != NULL) { |
698 | bdrv_delete(bs->file); | |
699 | } | |
700 | ||
f9092b10 | 701 | assert(bs != bs_snapshots); |
b338082b | 702 | qemu_free(bs); |
fc01f7e7 FB |
703 | } |
704 | ||
18846dee MA |
705 | int bdrv_attach(BlockDriverState *bs, DeviceState *qdev) |
706 | { | |
707 | if (bs->peer) { | |
708 | return -EBUSY; | |
709 | } | |
710 | bs->peer = qdev; | |
711 | return 0; | |
712 | } | |
713 | ||
714 | void bdrv_detach(BlockDriverState *bs, DeviceState *qdev) | |
715 | { | |
716 | assert(bs->peer == qdev); | |
717 | bs->peer = NULL; | |
718 | } | |
719 | ||
720 | DeviceState *bdrv_get_attached(BlockDriverState *bs) | |
721 | { | |
722 | return bs->peer; | |
723 | } | |
724 | ||
e97fc193 AL |
725 | /* |
726 | * Run consistency checks on an image | |
727 | * | |
e076f338 KW |
728 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
729 | * free of errors) or -errno when an internal error occured. The results of the | |
730 | * check are stored in res. | |
e97fc193 | 731 | */ |
e076f338 | 732 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
e97fc193 AL |
733 | { |
734 | if (bs->drv->bdrv_check == NULL) { | |
735 | return -ENOTSUP; | |
736 | } | |
737 | ||
e076f338 | 738 | memset(res, 0, sizeof(*res)); |
9ac228e0 | 739 | return bs->drv->bdrv_check(bs, res); |
e97fc193 AL |
740 | } |
741 | ||
33e3963e FB |
742 | /* commit COW file into the raw image */ |
743 | int bdrv_commit(BlockDriverState *bs) | |
744 | { | |
19cb3738 | 745 | BlockDriver *drv = bs->drv; |
83f64091 | 746 | int64_t i, total_sectors; |
4dca4b63 NS |
747 | int n, j, ro, open_flags; |
748 | int ret = 0, rw_ret = 0; | |
eb5a3165 | 749 | unsigned char sector[BDRV_SECTOR_SIZE]; |
4dca4b63 NS |
750 | char filename[1024]; |
751 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 752 | |
19cb3738 FB |
753 | if (!drv) |
754 | return -ENOMEDIUM; | |
4dca4b63 NS |
755 | |
756 | if (!bs->backing_hd) { | |
757 | return -ENOTSUP; | |
33e3963e FB |
758 | } |
759 | ||
4dca4b63 NS |
760 | if (bs->backing_hd->keep_read_only) { |
761 | return -EACCES; | |
762 | } | |
763 | ||
764 | ro = bs->backing_hd->read_only; | |
765 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
766 | open_flags = bs->backing_hd->open_flags; | |
767 | ||
768 | if (ro) { | |
769 | /* re-open as RW */ | |
770 | bdrv_delete(bs->backing_hd); | |
771 | bs->backing_hd = NULL; | |
772 | bs_rw = bdrv_new(""); | |
c3349197 | 773 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
4dca4b63 NS |
774 | if (rw_ret < 0) { |
775 | bdrv_delete(bs_rw); | |
776 | /* try to re-open read-only */ | |
777 | bs_ro = bdrv_new(""); | |
c3349197 | 778 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
779 | if (ret < 0) { |
780 | bdrv_delete(bs_ro); | |
781 | /* drive not functional anymore */ | |
782 | bs->drv = NULL; | |
783 | return ret; | |
784 | } | |
785 | bs->backing_hd = bs_ro; | |
786 | return rw_ret; | |
787 | } | |
788 | bs->backing_hd = bs_rw; | |
ea2384d3 | 789 | } |
33e3963e | 790 | |
6ea44308 | 791 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 792 | for (i = 0; i < total_sectors;) { |
19cb3738 | 793 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
794 | for(j = 0; j < n; j++) { |
795 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
4dca4b63 NS |
796 | ret = -EIO; |
797 | goto ro_cleanup; | |
ea2384d3 FB |
798 | } |
799 | ||
800 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
4dca4b63 NS |
801 | ret = -EIO; |
802 | goto ro_cleanup; | |
ea2384d3 FB |
803 | } |
804 | i++; | |
33e3963e | 805 | } |
ea2384d3 FB |
806 | } else { |
807 | i += n; | |
808 | } | |
33e3963e | 809 | } |
95389c86 | 810 | |
1d44952f CH |
811 | if (drv->bdrv_make_empty) { |
812 | ret = drv->bdrv_make_empty(bs); | |
813 | bdrv_flush(bs); | |
814 | } | |
95389c86 | 815 | |
3f5075ae CH |
816 | /* |
817 | * Make sure all data we wrote to the backing device is actually | |
818 | * stable on disk. | |
819 | */ | |
820 | if (bs->backing_hd) | |
821 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
822 | |
823 | ro_cleanup: | |
824 | ||
825 | if (ro) { | |
826 | /* re-open as RO */ | |
827 | bdrv_delete(bs->backing_hd); | |
828 | bs->backing_hd = NULL; | |
829 | bs_ro = bdrv_new(""); | |
c3349197 | 830 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
831 | if (ret < 0) { |
832 | bdrv_delete(bs_ro); | |
833 | /* drive not functional anymore */ | |
834 | bs->drv = NULL; | |
835 | return ret; | |
836 | } | |
837 | bs->backing_hd = bs_ro; | |
838 | bs->backing_hd->keep_read_only = 0; | |
839 | } | |
840 | ||
1d44952f | 841 | return ret; |
33e3963e FB |
842 | } |
843 | ||
6ab4b5ab MA |
844 | void bdrv_commit_all(void) |
845 | { | |
846 | BlockDriverState *bs; | |
847 | ||
848 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
849 | bdrv_commit(bs); | |
850 | } | |
851 | } | |
852 | ||
756e6736 KW |
853 | /* |
854 | * Return values: | |
855 | * 0 - success | |
856 | * -EINVAL - backing format specified, but no file | |
857 | * -ENOSPC - can't update the backing file because no space is left in the | |
858 | * image file header | |
859 | * -ENOTSUP - format driver doesn't support changing the backing file | |
860 | */ | |
861 | int bdrv_change_backing_file(BlockDriverState *bs, | |
862 | const char *backing_file, const char *backing_fmt) | |
863 | { | |
864 | BlockDriver *drv = bs->drv; | |
865 | ||
866 | if (drv->bdrv_change_backing_file != NULL) { | |
867 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
868 | } else { | |
869 | return -ENOTSUP; | |
870 | } | |
871 | } | |
872 | ||
71d0770c AL |
873 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
874 | size_t size) | |
875 | { | |
876 | int64_t len; | |
877 | ||
878 | if (!bdrv_is_inserted(bs)) | |
879 | return -ENOMEDIUM; | |
880 | ||
881 | if (bs->growable) | |
882 | return 0; | |
883 | ||
884 | len = bdrv_getlength(bs); | |
885 | ||
fbb7b4e0 KW |
886 | if (offset < 0) |
887 | return -EIO; | |
888 | ||
889 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
890 | return -EIO; |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
896 | int nb_sectors) | |
897 | { | |
eb5a3165 JS |
898 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
899 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
900 | } |
901 | ||
19cb3738 | 902 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 903 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
904 | uint8_t *buf, int nb_sectors) |
905 | { | |
ea2384d3 FB |
906 | BlockDriver *drv = bs->drv; |
907 | ||
19cb3738 FB |
908 | if (!drv) |
909 | return -ENOMEDIUM; | |
71d0770c AL |
910 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
911 | return -EIO; | |
b338082b | 912 | |
eda578e5 | 913 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
914 | } |
915 | ||
7cd1e32a | 916 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 917 | int nb_sectors, int dirty) |
7cd1e32a | 918 | { |
919 | int64_t start, end; | |
c6d22830 | 920 | unsigned long val, idx, bit; |
a55eb92c | 921 | |
6ea44308 | 922 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 923 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
924 | |
925 | for (; start <= end; start++) { | |
c6d22830 JK |
926 | idx = start / (sizeof(unsigned long) * 8); |
927 | bit = start % (sizeof(unsigned long) * 8); | |
928 | val = bs->dirty_bitmap[idx]; | |
929 | if (dirty) { | |
aaa0eb75 LS |
930 | if (!(val & (1 << bit))) { |
931 | bs->dirty_count++; | |
932 | val |= 1 << bit; | |
933 | } | |
c6d22830 | 934 | } else { |
aaa0eb75 LS |
935 | if (val & (1 << bit)) { |
936 | bs->dirty_count--; | |
937 | val &= ~(1 << bit); | |
938 | } | |
c6d22830 JK |
939 | } |
940 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 941 | } |
942 | } | |
943 | ||
5fafdf24 | 944 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
945 | -EIO generic I/O error (may happen for all errors) |
946 | -ENOMEDIUM No media inserted. | |
947 | -EINVAL Invalid sector number or nb_sectors | |
948 | -EACCES Trying to write a read-only device | |
949 | */ | |
5fafdf24 | 950 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
951 | const uint8_t *buf, int nb_sectors) |
952 | { | |
83f64091 | 953 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
954 | if (!bs->drv) |
955 | return -ENOMEDIUM; | |
0849bf08 | 956 | if (bs->read_only) |
19cb3738 | 957 | return -EACCES; |
71d0770c AL |
958 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
959 | return -EIO; | |
a55eb92c | 960 | |
c6d22830 | 961 | if (bs->dirty_bitmap) { |
7cd1e32a | 962 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
963 | } | |
a55eb92c | 964 | |
294cc35f KW |
965 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
966 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
967 | } | |
968 | ||
42fb2807 | 969 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
970 | } |
971 | ||
eda578e5 AL |
972 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
973 | void *buf, int count1) | |
83f64091 | 974 | { |
6ea44308 | 975 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
976 | int len, nb_sectors, count; |
977 | int64_t sector_num; | |
9a8c4cce | 978 | int ret; |
83f64091 FB |
979 | |
980 | count = count1; | |
981 | /* first read to align to sector start */ | |
6ea44308 | 982 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
983 | if (len > count) |
984 | len = count; | |
6ea44308 | 985 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 986 | if (len > 0) { |
9a8c4cce KW |
987 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
988 | return ret; | |
6ea44308 | 989 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
990 | count -= len; |
991 | if (count == 0) | |
992 | return count1; | |
993 | sector_num++; | |
994 | buf += len; | |
995 | } | |
996 | ||
997 | /* read the sectors "in place" */ | |
6ea44308 | 998 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 999 | if (nb_sectors > 0) { |
9a8c4cce KW |
1000 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1001 | return ret; | |
83f64091 | 1002 | sector_num += nb_sectors; |
6ea44308 | 1003 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1004 | buf += len; |
1005 | count -= len; | |
1006 | } | |
1007 | ||
1008 | /* add data from the last sector */ | |
1009 | if (count > 0) { | |
9a8c4cce KW |
1010 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1011 | return ret; | |
83f64091 FB |
1012 | memcpy(buf, tmp_buf, count); |
1013 | } | |
1014 | return count1; | |
1015 | } | |
1016 | ||
eda578e5 AL |
1017 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1018 | const void *buf, int count1) | |
83f64091 | 1019 | { |
6ea44308 | 1020 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1021 | int len, nb_sectors, count; |
1022 | int64_t sector_num; | |
9a8c4cce | 1023 | int ret; |
83f64091 FB |
1024 | |
1025 | count = count1; | |
1026 | /* first write to align to sector start */ | |
6ea44308 | 1027 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1028 | if (len > count) |
1029 | len = count; | |
6ea44308 | 1030 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1031 | if (len > 0) { |
9a8c4cce KW |
1032 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1033 | return ret; | |
6ea44308 | 1034 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1035 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1036 | return ret; | |
83f64091 FB |
1037 | count -= len; |
1038 | if (count == 0) | |
1039 | return count1; | |
1040 | sector_num++; | |
1041 | buf += len; | |
1042 | } | |
1043 | ||
1044 | /* write the sectors "in place" */ | |
6ea44308 | 1045 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1046 | if (nb_sectors > 0) { |
9a8c4cce KW |
1047 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1048 | return ret; | |
83f64091 | 1049 | sector_num += nb_sectors; |
6ea44308 | 1050 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1051 | buf += len; |
1052 | count -= len; | |
1053 | } | |
1054 | ||
1055 | /* add data from the last sector */ | |
1056 | if (count > 0) { | |
9a8c4cce KW |
1057 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1058 | return ret; | |
83f64091 | 1059 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1060 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1061 | return ret; | |
83f64091 FB |
1062 | } |
1063 | return count1; | |
1064 | } | |
83f64091 | 1065 | |
f08145fe KW |
1066 | /* |
1067 | * Writes to the file and ensures that no writes are reordered across this | |
1068 | * request (acts as a barrier) | |
1069 | * | |
1070 | * Returns 0 on success, -errno in error cases. | |
1071 | */ | |
1072 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1073 | const void *buf, int count) | |
1074 | { | |
1075 | int ret; | |
1076 | ||
1077 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1078 | if (ret < 0) { | |
1079 | return ret; | |
1080 | } | |
1081 | ||
1082 | /* No flush needed for cache=writethrough, it uses O_DSYNC */ | |
1083 | if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { | |
1084 | bdrv_flush(bs); | |
1085 | } | |
1086 | ||
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Writes to the file and ensures that no writes are reordered across this | |
1092 | * request (acts as a barrier) | |
1093 | * | |
1094 | * Returns 0 on success, -errno in error cases. | |
1095 | */ | |
1096 | int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, | |
1097 | const uint8_t *buf, int nb_sectors) | |
1098 | { | |
1099 | return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, | |
1100 | buf, BDRV_SECTOR_SIZE * nb_sectors); | |
1101 | } | |
1102 | ||
83f64091 FB |
1103 | /** |
1104 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1105 | */ | |
1106 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1107 | { | |
1108 | BlockDriver *drv = bs->drv; | |
51762288 | 1109 | int ret; |
83f64091 | 1110 | if (!drv) |
19cb3738 | 1111 | return -ENOMEDIUM; |
83f64091 FB |
1112 | if (!drv->bdrv_truncate) |
1113 | return -ENOTSUP; | |
59f2689d NS |
1114 | if (bs->read_only) |
1115 | return -EACCES; | |
51762288 SH |
1116 | ret = drv->bdrv_truncate(bs, offset); |
1117 | if (ret == 0) { | |
1118 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1119 | } | |
1120 | return ret; | |
83f64091 FB |
1121 | } |
1122 | ||
1123 | /** | |
1124 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1125 | */ | |
1126 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1127 | { | |
1128 | BlockDriver *drv = bs->drv; | |
1129 | if (!drv) | |
19cb3738 | 1130 | return -ENOMEDIUM; |
51762288 SH |
1131 | |
1132 | /* Fixed size devices use the total_sectors value for speed instead of | |
1133 | issuing a length query (like lseek) on each call. Also, legacy block | |
1134 | drivers don't provide a bdrv_getlength function and must use | |
1135 | total_sectors. */ | |
1136 | if (!bs->growable || !drv->bdrv_getlength) { | |
6ea44308 | 1137 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
1138 | } |
1139 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
1140 | } |
1141 | ||
19cb3738 | 1142 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1143 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1144 | { |
19cb3738 FB |
1145 | int64_t length; |
1146 | length = bdrv_getlength(bs); | |
1147 | if (length < 0) | |
1148 | length = 0; | |
1149 | else | |
6ea44308 | 1150 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1151 | *nb_sectors_ptr = length; |
fc01f7e7 | 1152 | } |
cf98951b | 1153 | |
f3d54fc4 AL |
1154 | struct partition { |
1155 | uint8_t boot_ind; /* 0x80 - active */ | |
1156 | uint8_t head; /* starting head */ | |
1157 | uint8_t sector; /* starting sector */ | |
1158 | uint8_t cyl; /* starting cylinder */ | |
1159 | uint8_t sys_ind; /* What partition type */ | |
1160 | uint8_t end_head; /* end head */ | |
1161 | uint8_t end_sector; /* end sector */ | |
1162 | uint8_t end_cyl; /* end cylinder */ | |
1163 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1164 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1165 | } __attribute__((packed)); | |
1166 | ||
1167 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1168 | static int guess_disk_lchs(BlockDriverState *bs, | |
1169 | int *pcylinders, int *pheads, int *psectors) | |
1170 | { | |
eb5a3165 | 1171 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
1172 | int ret, i, heads, sectors, cylinders; |
1173 | struct partition *p; | |
1174 | uint32_t nr_sects; | |
a38131b6 | 1175 | uint64_t nb_sectors; |
f3d54fc4 AL |
1176 | |
1177 | bdrv_get_geometry(bs, &nb_sectors); | |
1178 | ||
1179 | ret = bdrv_read(bs, 0, buf, 1); | |
1180 | if (ret < 0) | |
1181 | return -1; | |
1182 | /* test msdos magic */ | |
1183 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1184 | return -1; | |
1185 | for(i = 0; i < 4; i++) { | |
1186 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1187 | nr_sects = le32_to_cpu(p->nr_sects); | |
1188 | if (nr_sects && p->end_head) { | |
1189 | /* We make the assumption that the partition terminates on | |
1190 | a cylinder boundary */ | |
1191 | heads = p->end_head + 1; | |
1192 | sectors = p->end_sector & 63; | |
1193 | if (sectors == 0) | |
1194 | continue; | |
1195 | cylinders = nb_sectors / (heads * sectors); | |
1196 | if (cylinders < 1 || cylinders > 16383) | |
1197 | continue; | |
1198 | *pheads = heads; | |
1199 | *psectors = sectors; | |
1200 | *pcylinders = cylinders; | |
1201 | #if 0 | |
1202 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1203 | cylinders, heads, sectors); | |
1204 | #endif | |
1205 | return 0; | |
1206 | } | |
1207 | } | |
1208 | return -1; | |
1209 | } | |
1210 | ||
1211 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1212 | { | |
1213 | int translation, lba_detected = 0; | |
1214 | int cylinders, heads, secs; | |
a38131b6 | 1215 | uint64_t nb_sectors; |
f3d54fc4 AL |
1216 | |
1217 | /* if a geometry hint is available, use it */ | |
1218 | bdrv_get_geometry(bs, &nb_sectors); | |
1219 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1220 | translation = bdrv_get_translation_hint(bs); | |
1221 | if (cylinders != 0) { | |
1222 | *pcyls = cylinders; | |
1223 | *pheads = heads; | |
1224 | *psecs = secs; | |
1225 | } else { | |
1226 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1227 | if (heads > 16) { | |
1228 | /* if heads > 16, it means that a BIOS LBA | |
1229 | translation was active, so the default | |
1230 | hardware geometry is OK */ | |
1231 | lba_detected = 1; | |
1232 | goto default_geometry; | |
1233 | } else { | |
1234 | *pcyls = cylinders; | |
1235 | *pheads = heads; | |
1236 | *psecs = secs; | |
1237 | /* disable any translation to be in sync with | |
1238 | the logical geometry */ | |
1239 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1240 | bdrv_set_translation_hint(bs, | |
1241 | BIOS_ATA_TRANSLATION_NONE); | |
1242 | } | |
1243 | } | |
1244 | } else { | |
1245 | default_geometry: | |
1246 | /* if no geometry, use a standard physical disk geometry */ | |
1247 | cylinders = nb_sectors / (16 * 63); | |
1248 | ||
1249 | if (cylinders > 16383) | |
1250 | cylinders = 16383; | |
1251 | else if (cylinders < 2) | |
1252 | cylinders = 2; | |
1253 | *pcyls = cylinders; | |
1254 | *pheads = 16; | |
1255 | *psecs = 63; | |
1256 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1257 | if ((*pcyls * *pheads) <= 131072) { | |
1258 | bdrv_set_translation_hint(bs, | |
1259 | BIOS_ATA_TRANSLATION_LARGE); | |
1260 | } else { | |
1261 | bdrv_set_translation_hint(bs, | |
1262 | BIOS_ATA_TRANSLATION_LBA); | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1267 | } | |
1268 | } | |
1269 | ||
5fafdf24 | 1270 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1271 | int cyls, int heads, int secs) |
1272 | { | |
1273 | bs->cyls = cyls; | |
1274 | bs->heads = heads; | |
1275 | bs->secs = secs; | |
1276 | } | |
1277 | ||
1278 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1279 | { | |
1280 | bs->type = type; | |
1281 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1282 | type == BDRV_TYPE_FLOPPY)); | |
1283 | } | |
1284 | ||
46d4767d FB |
1285 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1286 | { | |
1287 | bs->translation = translation; | |
1288 | } | |
1289 | ||
5fafdf24 | 1290 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1291 | int *pcyls, int *pheads, int *psecs) |
1292 | { | |
1293 | *pcyls = bs->cyls; | |
1294 | *pheads = bs->heads; | |
1295 | *psecs = bs->secs; | |
1296 | } | |
1297 | ||
1298 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1299 | { | |
1300 | return bs->type; | |
1301 | } | |
1302 | ||
46d4767d FB |
1303 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1304 | { | |
1305 | return bs->translation; | |
1306 | } | |
1307 | ||
abd7f68d MA |
1308 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
1309 | BlockErrorAction on_write_error) | |
1310 | { | |
1311 | bs->on_read_error = on_read_error; | |
1312 | bs->on_write_error = on_write_error; | |
1313 | } | |
1314 | ||
1315 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1316 | { | |
1317 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1318 | } | |
1319 | ||
7d0d6950 MA |
1320 | void bdrv_set_removable(BlockDriverState *bs, int removable) |
1321 | { | |
1322 | bs->removable = removable; | |
1323 | if (removable && bs == bs_snapshots) { | |
1324 | bs_snapshots = NULL; | |
1325 | } | |
1326 | } | |
1327 | ||
b338082b FB |
1328 | int bdrv_is_removable(BlockDriverState *bs) |
1329 | { | |
1330 | return bs->removable; | |
1331 | } | |
1332 | ||
1333 | int bdrv_is_read_only(BlockDriverState *bs) | |
1334 | { | |
1335 | return bs->read_only; | |
1336 | } | |
1337 | ||
985a03b0 TS |
1338 | int bdrv_is_sg(BlockDriverState *bs) |
1339 | { | |
1340 | return bs->sg; | |
1341 | } | |
1342 | ||
e900a7b7 CH |
1343 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1344 | { | |
1345 | return bs->enable_write_cache; | |
1346 | } | |
1347 | ||
19cb3738 | 1348 | /* XXX: no longer used */ |
5fafdf24 | 1349 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1350 | void (*change_cb)(void *opaque), void *opaque) |
1351 | { | |
1352 | bs->change_cb = change_cb; | |
1353 | bs->change_opaque = opaque; | |
1354 | } | |
1355 | ||
ea2384d3 FB |
1356 | int bdrv_is_encrypted(BlockDriverState *bs) |
1357 | { | |
1358 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1359 | return 1; | |
1360 | return bs->encrypted; | |
1361 | } | |
1362 | ||
c0f4ce77 AL |
1363 | int bdrv_key_required(BlockDriverState *bs) |
1364 | { | |
1365 | BlockDriverState *backing_hd = bs->backing_hd; | |
1366 | ||
1367 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1368 | return 1; | |
1369 | return (bs->encrypted && !bs->valid_key); | |
1370 | } | |
1371 | ||
ea2384d3 FB |
1372 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1373 | { | |
1374 | int ret; | |
1375 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1376 | ret = bdrv_set_key(bs->backing_hd, key); | |
1377 | if (ret < 0) | |
1378 | return ret; | |
1379 | if (!bs->encrypted) | |
1380 | return 0; | |
1381 | } | |
fd04a2ae SH |
1382 | if (!bs->encrypted) { |
1383 | return -EINVAL; | |
1384 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1385 | return -ENOMEDIUM; | |
1386 | } | |
c0f4ce77 | 1387 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1388 | if (ret < 0) { |
1389 | bs->valid_key = 0; | |
1390 | } else if (!bs->valid_key) { | |
1391 | bs->valid_key = 1; | |
1392 | /* call the change callback now, we skipped it on open */ | |
1393 | bs->media_changed = 1; | |
1394 | if (bs->change_cb) | |
1395 | bs->change_cb(bs->change_opaque); | |
1396 | } | |
c0f4ce77 | 1397 | return ret; |
ea2384d3 FB |
1398 | } |
1399 | ||
1400 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1401 | { | |
19cb3738 | 1402 | if (!bs->drv) { |
ea2384d3 FB |
1403 | buf[0] = '\0'; |
1404 | } else { | |
1405 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1406 | } | |
1407 | } | |
1408 | ||
5fafdf24 | 1409 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1410 | void *opaque) |
1411 | { | |
1412 | BlockDriver *drv; | |
1413 | ||
8a22f02a | 1414 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1415 | it(opaque, drv->format_name); |
1416 | } | |
1417 | } | |
1418 | ||
b338082b FB |
1419 | BlockDriverState *bdrv_find(const char *name) |
1420 | { | |
1421 | BlockDriverState *bs; | |
1422 | ||
1b7bdbc1 SH |
1423 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1424 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1425 | return bs; |
1b7bdbc1 | 1426 | } |
b338082b FB |
1427 | } |
1428 | return NULL; | |
1429 | } | |
1430 | ||
2f399b0a MA |
1431 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
1432 | { | |
1433 | if (!bs) { | |
1434 | return QTAILQ_FIRST(&bdrv_states); | |
1435 | } | |
1436 | return QTAILQ_NEXT(bs, list); | |
1437 | } | |
1438 | ||
51de9760 | 1439 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1440 | { |
1441 | BlockDriverState *bs; | |
1442 | ||
1b7bdbc1 | 1443 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1444 | it(opaque, bs); |
81d0912d FB |
1445 | } |
1446 | } | |
1447 | ||
ea2384d3 FB |
1448 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1449 | { | |
1450 | return bs->device_name; | |
1451 | } | |
1452 | ||
7a6cba61 PB |
1453 | void bdrv_flush(BlockDriverState *bs) |
1454 | { | |
016f5cf6 AG |
1455 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
1456 | return; | |
1457 | } | |
1458 | ||
3f5075ae | 1459 | if (bs->drv && bs->drv->bdrv_flush) |
7a6cba61 | 1460 | bs->drv->bdrv_flush(bs); |
7a6cba61 PB |
1461 | } |
1462 | ||
c6ca28d6 AL |
1463 | void bdrv_flush_all(void) |
1464 | { | |
1465 | BlockDriverState *bs; | |
1466 | ||
1b7bdbc1 SH |
1467 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1468 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1469 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
c6ca28d6 | 1470 | bdrv_flush(bs); |
1b7bdbc1 SH |
1471 | } |
1472 | } | |
c6ca28d6 AL |
1473 | } |
1474 | ||
f2feebbd KW |
1475 | int bdrv_has_zero_init(BlockDriverState *bs) |
1476 | { | |
1477 | assert(bs->drv); | |
1478 | ||
1479 | if (bs->drv->no_zero_init) { | |
1480 | return 0; | |
1481 | } else if (bs->file) { | |
1482 | return bdrv_has_zero_init(bs->file); | |
1483 | } | |
1484 | ||
1485 | return 1; | |
1486 | } | |
1487 | ||
f58c7b35 TS |
1488 | /* |
1489 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1490 | * not implementing the functionality are assumed to not support backing files, | |
1491 | * hence all their sectors are reported as allocated. | |
1492 | * | |
1493 | * 'pnum' is set to the number of sectors (including and immediately following | |
1494 | * the specified sector) that are known to be in the same | |
1495 | * allocated/unallocated state. | |
1496 | * | |
1497 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1498 | */ | |
1499 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1500 | int *pnum) | |
1501 | { | |
1502 | int64_t n; | |
1503 | if (!bs->drv->bdrv_is_allocated) { | |
1504 | if (sector_num >= bs->total_sectors) { | |
1505 | *pnum = 0; | |
1506 | return 0; | |
1507 | } | |
1508 | n = bs->total_sectors - sector_num; | |
1509 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1510 | return 1; | |
1511 | } | |
1512 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1513 | } | |
1514 | ||
2582bfed LC |
1515 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1516 | BlockMonEventAction action, int is_read) | |
1517 | { | |
1518 | QObject *data; | |
1519 | const char *action_str; | |
1520 | ||
1521 | switch (action) { | |
1522 | case BDRV_ACTION_REPORT: | |
1523 | action_str = "report"; | |
1524 | break; | |
1525 | case BDRV_ACTION_IGNORE: | |
1526 | action_str = "ignore"; | |
1527 | break; | |
1528 | case BDRV_ACTION_STOP: | |
1529 | action_str = "stop"; | |
1530 | break; | |
1531 | default: | |
1532 | abort(); | |
1533 | } | |
1534 | ||
1535 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1536 | bdrv->device_name, | |
1537 | action_str, | |
1538 | is_read ? "read" : "write"); | |
1539 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1540 | ||
1541 | qobject_decref(data); | |
1542 | } | |
1543 | ||
d15e5465 | 1544 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1545 | { |
d15e5465 LC |
1546 | QDict *bs_dict; |
1547 | Monitor *mon = opaque; | |
1548 | ||
1549 | bs_dict = qobject_to_qdict(obj); | |
1550 | ||
1551 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1552 | qdict_get_str(bs_dict, "device"), | |
1553 | qdict_get_str(bs_dict, "type"), | |
1554 | qdict_get_bool(bs_dict, "removable")); | |
1555 | ||
1556 | if (qdict_get_bool(bs_dict, "removable")) { | |
1557 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1558 | } | |
1559 | ||
1560 | if (qdict_haskey(bs_dict, "inserted")) { | |
1561 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1562 | ||
1563 | monitor_printf(mon, " file="); | |
1564 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1565 | if (qdict_haskey(qdict, "backing_file")) { | |
1566 | monitor_printf(mon, " backing_file="); | |
1567 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1568 | } | |
1569 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1570 | qdict_get_bool(qdict, "ro"), | |
1571 | qdict_get_str(qdict, "drv"), | |
1572 | qdict_get_bool(qdict, "encrypted")); | |
1573 | } else { | |
1574 | monitor_printf(mon, " [not inserted]"); | |
1575 | } | |
1576 | ||
1577 | monitor_printf(mon, "\n"); | |
1578 | } | |
1579 | ||
1580 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1581 | { | |
1582 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1583 | } | |
1584 | ||
d15e5465 LC |
1585 | void bdrv_info(Monitor *mon, QObject **ret_data) |
1586 | { | |
1587 | QList *bs_list; | |
b338082b FB |
1588 | BlockDriverState *bs; |
1589 | ||
d15e5465 LC |
1590 | bs_list = qlist_new(); |
1591 | ||
1b7bdbc1 | 1592 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 LC |
1593 | QObject *bs_obj; |
1594 | const char *type = "unknown"; | |
1595 | ||
b338082b FB |
1596 | switch(bs->type) { |
1597 | case BDRV_TYPE_HD: | |
d15e5465 | 1598 | type = "hd"; |
b338082b FB |
1599 | break; |
1600 | case BDRV_TYPE_CDROM: | |
d15e5465 | 1601 | type = "cdrom"; |
b338082b FB |
1602 | break; |
1603 | case BDRV_TYPE_FLOPPY: | |
d15e5465 | 1604 | type = "floppy"; |
b338082b FB |
1605 | break; |
1606 | } | |
d15e5465 LC |
1607 | |
1608 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1609 | "'removable': %i, 'locked': %i }", | |
1610 | bs->device_name, type, bs->removable, | |
1611 | bs->locked); | |
d15e5465 | 1612 | |
19cb3738 | 1613 | if (bs->drv) { |
d15e5465 LC |
1614 | QObject *obj; |
1615 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1616 | ||
1617 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1618 | "'encrypted': %i }", | |
1619 | bs->filename, bs->read_only, | |
1620 | bs->drv->format_name, | |
1621 | bdrv_is_encrypted(bs)); | |
fef30743 | 1622 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1623 | QDict *qdict = qobject_to_qdict(obj); |
1624 | qdict_put(qdict, "backing_file", | |
1625 | qstring_from_str(bs->backing_file)); | |
376253ec | 1626 | } |
d15e5465 LC |
1627 | |
1628 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1629 | } |
d15e5465 | 1630 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1631 | } |
d15e5465 LC |
1632 | |
1633 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1634 | } |
a36e69dd | 1635 | |
218a536a | 1636 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1637 | { |
218a536a LC |
1638 | QDict *qdict; |
1639 | Monitor *mon = opaque; | |
1640 | ||
1641 | qdict = qobject_to_qdict(data); | |
1642 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1643 | ||
1644 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1645 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1646 | " wr_bytes=%" PRId64 | |
1647 | " rd_operations=%" PRId64 | |
1648 | " wr_operations=%" PRId64 | |
1649 | "\n", | |
1650 | qdict_get_int(qdict, "rd_bytes"), | |
1651 | qdict_get_int(qdict, "wr_bytes"), | |
1652 | qdict_get_int(qdict, "rd_operations"), | |
1653 | qdict_get_int(qdict, "wr_operations")); | |
1654 | } | |
1655 | ||
1656 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1657 | { | |
1658 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1659 | } | |
1660 | ||
294cc35f KW |
1661 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
1662 | { | |
1663 | QObject *res; | |
1664 | QDict *dict; | |
1665 | ||
1666 | res = qobject_from_jsonf("{ 'stats': {" | |
1667 | "'rd_bytes': %" PRId64 "," | |
1668 | "'wr_bytes': %" PRId64 "," | |
1669 | "'rd_operations': %" PRId64 "," | |
1670 | "'wr_operations': %" PRId64 "," | |
1671 | "'wr_highest_offset': %" PRId64 | |
1672 | "} }", | |
1673 | bs->rd_bytes, bs->wr_bytes, | |
1674 | bs->rd_ops, bs->wr_ops, | |
5ffbbc67 BS |
1675 | bs->wr_highest_sector * |
1676 | (uint64_t)BDRV_SECTOR_SIZE); | |
294cc35f KW |
1677 | dict = qobject_to_qdict(res); |
1678 | ||
1679 | if (*bs->device_name) { | |
1680 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1681 | } | |
1682 | ||
1683 | if (bs->file) { | |
1684 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1685 | qdict_put_obj(dict, "parent", parent); | |
1686 | } | |
1687 | ||
1688 | return res; | |
1689 | } | |
1690 | ||
218a536a LC |
1691 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
1692 | { | |
1693 | QObject *obj; | |
1694 | QList *devices; | |
a36e69dd TS |
1695 | BlockDriverState *bs; |
1696 | ||
218a536a LC |
1697 | devices = qlist_new(); |
1698 | ||
1b7bdbc1 | 1699 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
294cc35f | 1700 | obj = bdrv_info_stats_bs(bs); |
218a536a | 1701 | qlist_append_obj(devices, obj); |
a36e69dd | 1702 | } |
218a536a LC |
1703 | |
1704 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1705 | } |
ea2384d3 | 1706 | |
045df330 AL |
1707 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1708 | { | |
1709 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1710 | return bs->backing_file; | |
1711 | else if (bs->encrypted) | |
1712 | return bs->filename; | |
1713 | else | |
1714 | return NULL; | |
1715 | } | |
1716 | ||
5fafdf24 | 1717 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1718 | char *filename, int filename_size) |
1719 | { | |
b783e409 | 1720 | if (!bs->backing_file) { |
83f64091 FB |
1721 | pstrcpy(filename, filename_size, ""); |
1722 | } else { | |
1723 | pstrcpy(filename, filename_size, bs->backing_file); | |
1724 | } | |
1725 | } | |
1726 | ||
5fafdf24 | 1727 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1728 | const uint8_t *buf, int nb_sectors) |
1729 | { | |
1730 | BlockDriver *drv = bs->drv; | |
1731 | if (!drv) | |
19cb3738 | 1732 | return -ENOMEDIUM; |
faea38e7 FB |
1733 | if (!drv->bdrv_write_compressed) |
1734 | return -ENOTSUP; | |
fbb7b4e0 KW |
1735 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1736 | return -EIO; | |
a55eb92c | 1737 | |
c6d22830 | 1738 | if (bs->dirty_bitmap) { |
7cd1e32a | 1739 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1740 | } | |
a55eb92c | 1741 | |
faea38e7 FB |
1742 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1743 | } | |
3b46e624 | 1744 | |
faea38e7 FB |
1745 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1746 | { | |
1747 | BlockDriver *drv = bs->drv; | |
1748 | if (!drv) | |
19cb3738 | 1749 | return -ENOMEDIUM; |
faea38e7 FB |
1750 | if (!drv->bdrv_get_info) |
1751 | return -ENOTSUP; | |
1752 | memset(bdi, 0, sizeof(*bdi)); | |
1753 | return drv->bdrv_get_info(bs, bdi); | |
1754 | } | |
1755 | ||
45566e9c CH |
1756 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1757 | int64_t pos, int size) | |
178e08a5 AL |
1758 | { |
1759 | BlockDriver *drv = bs->drv; | |
1760 | if (!drv) | |
1761 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1762 | if (drv->bdrv_save_vmstate) |
1763 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1764 | if (bs->file) | |
1765 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
1766 | return -ENOTSUP; | |
178e08a5 AL |
1767 | } |
1768 | ||
45566e9c CH |
1769 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1770 | int64_t pos, int size) | |
178e08a5 AL |
1771 | { |
1772 | BlockDriver *drv = bs->drv; | |
1773 | if (!drv) | |
1774 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1775 | if (drv->bdrv_load_vmstate) |
1776 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
1777 | if (bs->file) | |
1778 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
1779 | return -ENOTSUP; | |
178e08a5 AL |
1780 | } |
1781 | ||
8b9b0cc2 KW |
1782 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
1783 | { | |
1784 | BlockDriver *drv = bs->drv; | |
1785 | ||
1786 | if (!drv || !drv->bdrv_debug_event) { | |
1787 | return; | |
1788 | } | |
1789 | ||
1790 | return drv->bdrv_debug_event(bs, event); | |
1791 | ||
1792 | } | |
1793 | ||
faea38e7 FB |
1794 | /**************************************************************/ |
1795 | /* handling of snapshots */ | |
1796 | ||
feeee5ac MDCF |
1797 | int bdrv_can_snapshot(BlockDriverState *bs) |
1798 | { | |
1799 | BlockDriver *drv = bs->drv; | |
1800 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { | |
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | if (!drv->bdrv_snapshot_create) { | |
1805 | if (bs->file != NULL) { | |
1806 | return bdrv_can_snapshot(bs->file); | |
1807 | } | |
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | return 1; | |
1812 | } | |
1813 | ||
7829bc6c BS |
1814 | int bdrv_is_snapshot(BlockDriverState *bs) |
1815 | { | |
1816 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
1817 | } | |
1818 | ||
f9092b10 MA |
1819 | BlockDriverState *bdrv_snapshots(void) |
1820 | { | |
1821 | BlockDriverState *bs; | |
1822 | ||
3ac906f7 | 1823 | if (bs_snapshots) { |
f9092b10 | 1824 | return bs_snapshots; |
3ac906f7 | 1825 | } |
f9092b10 MA |
1826 | |
1827 | bs = NULL; | |
1828 | while ((bs = bdrv_next(bs))) { | |
1829 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
1830 | bs_snapshots = bs; |
1831 | return bs; | |
f9092b10 MA |
1832 | } |
1833 | } | |
1834 | return NULL; | |
f9092b10 MA |
1835 | } |
1836 | ||
5fafdf24 | 1837 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1838 | QEMUSnapshotInfo *sn_info) |
1839 | { | |
1840 | BlockDriver *drv = bs->drv; | |
1841 | if (!drv) | |
19cb3738 | 1842 | return -ENOMEDIUM; |
7cdb1f6d MK |
1843 | if (drv->bdrv_snapshot_create) |
1844 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1845 | if (bs->file) | |
1846 | return bdrv_snapshot_create(bs->file, sn_info); | |
1847 | return -ENOTSUP; | |
faea38e7 FB |
1848 | } |
1849 | ||
5fafdf24 | 1850 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1851 | const char *snapshot_id) |
1852 | { | |
1853 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
1854 | int ret, open_ret; |
1855 | ||
faea38e7 | 1856 | if (!drv) |
19cb3738 | 1857 | return -ENOMEDIUM; |
7cdb1f6d MK |
1858 | if (drv->bdrv_snapshot_goto) |
1859 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1860 | ||
1861 | if (bs->file) { | |
1862 | drv->bdrv_close(bs); | |
1863 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
1864 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
1865 | if (open_ret < 0) { | |
1866 | bdrv_delete(bs->file); | |
1867 | bs->drv = NULL; | |
1868 | return open_ret; | |
1869 | } | |
1870 | return ret; | |
1871 | } | |
1872 | ||
1873 | return -ENOTSUP; | |
faea38e7 FB |
1874 | } |
1875 | ||
1876 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1877 | { | |
1878 | BlockDriver *drv = bs->drv; | |
1879 | if (!drv) | |
19cb3738 | 1880 | return -ENOMEDIUM; |
7cdb1f6d MK |
1881 | if (drv->bdrv_snapshot_delete) |
1882 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1883 | if (bs->file) | |
1884 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
1885 | return -ENOTSUP; | |
faea38e7 FB |
1886 | } |
1887 | ||
5fafdf24 | 1888 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1889 | QEMUSnapshotInfo **psn_info) |
1890 | { | |
1891 | BlockDriver *drv = bs->drv; | |
1892 | if (!drv) | |
19cb3738 | 1893 | return -ENOMEDIUM; |
7cdb1f6d MK |
1894 | if (drv->bdrv_snapshot_list) |
1895 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1896 | if (bs->file) | |
1897 | return bdrv_snapshot_list(bs->file, psn_info); | |
1898 | return -ENOTSUP; | |
faea38e7 FB |
1899 | } |
1900 | ||
1901 | #define NB_SUFFIXES 4 | |
1902 | ||
1903 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1904 | { | |
1905 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1906 | int64_t base; | |
1907 | int i; | |
1908 | ||
1909 | if (size <= 999) { | |
1910 | snprintf(buf, buf_size, "%" PRId64, size); | |
1911 | } else { | |
1912 | base = 1024; | |
1913 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1914 | if (size < (10 * base)) { | |
5fafdf24 | 1915 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1916 | (double)size / base, |
1917 | suffixes[i]); | |
1918 | break; | |
1919 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1920 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1921 | ((size + (base >> 1)) / base), |
1922 | suffixes[i]); | |
1923 | break; | |
1924 | } | |
1925 | base = base * 1024; | |
1926 | } | |
1927 | } | |
1928 | return buf; | |
1929 | } | |
1930 | ||
1931 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1932 | { | |
1933 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1934 | #ifdef _WIN32 |
1935 | struct tm *ptm; | |
1936 | #else | |
faea38e7 | 1937 | struct tm tm; |
3b9f94e1 | 1938 | #endif |
faea38e7 FB |
1939 | time_t ti; |
1940 | int64_t secs; | |
1941 | ||
1942 | if (!sn) { | |
5fafdf24 TS |
1943 | snprintf(buf, buf_size, |
1944 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1945 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1946 | } else { | |
1947 | ti = sn->date_sec; | |
3b9f94e1 FB |
1948 | #ifdef _WIN32 |
1949 | ptm = localtime(&ti); | |
1950 | strftime(date_buf, sizeof(date_buf), | |
1951 | "%Y-%m-%d %H:%M:%S", ptm); | |
1952 | #else | |
faea38e7 FB |
1953 | localtime_r(&ti, &tm); |
1954 | strftime(date_buf, sizeof(date_buf), | |
1955 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1956 | #endif |
faea38e7 FB |
1957 | secs = sn->vm_clock_nsec / 1000000000; |
1958 | snprintf(clock_buf, sizeof(clock_buf), | |
1959 | "%02d:%02d:%02d.%03d", | |
1960 | (int)(secs / 3600), | |
1961 | (int)((secs / 60) % 60), | |
5fafdf24 | 1962 | (int)(secs % 60), |
faea38e7 FB |
1963 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1964 | snprintf(buf, buf_size, | |
5fafdf24 | 1965 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1966 | sn->id_str, sn->name, |
1967 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1968 | date_buf, | |
1969 | clock_buf); | |
1970 | } | |
1971 | return buf; | |
1972 | } | |
1973 | ||
83f64091 | 1974 | |
ea2384d3 | 1975 | /**************************************************************/ |
83f64091 | 1976 | /* async I/Os */ |
ea2384d3 | 1977 | |
3b69e4b9 | 1978 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1979 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1980 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1981 | { |
1982 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1983 | BlockDriverAIOCB *ret; |
83f64091 | 1984 | |
19cb3738 | 1985 | if (!drv) |
ce1a14dc | 1986 | return NULL; |
71d0770c AL |
1987 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1988 | return NULL; | |
3b46e624 | 1989 | |
f141eafe AL |
1990 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1991 | cb, opaque); | |
a36e69dd TS |
1992 | |
1993 | if (ret) { | |
1994 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1995 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1996 | bs->rd_ops ++; |
1997 | } | |
1998 | ||
1999 | return ret; | |
ea2384d3 FB |
2000 | } |
2001 | ||
f141eafe AL |
2002 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2003 | QEMUIOVector *qiov, int nb_sectors, | |
2004 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 2005 | { |
83f64091 | 2006 | BlockDriver *drv = bs->drv; |
a36e69dd | 2007 | BlockDriverAIOCB *ret; |
ea2384d3 | 2008 | |
19cb3738 | 2009 | if (!drv) |
ce1a14dc | 2010 | return NULL; |
83f64091 | 2011 | if (bs->read_only) |
ce1a14dc | 2012 | return NULL; |
71d0770c AL |
2013 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2014 | return NULL; | |
83f64091 | 2015 | |
c6d22830 | 2016 | if (bs->dirty_bitmap) { |
7cd1e32a | 2017 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
2018 | } | |
a55eb92c | 2019 | |
f141eafe AL |
2020 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
2021 | cb, opaque); | |
a36e69dd TS |
2022 | |
2023 | if (ret) { | |
294cc35f KW |
2024 | /* Update stats even though technically transfer has not happened. */ |
2025 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
2026 | bs->wr_ops ++; | |
2027 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2028 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2029 | } | |
a36e69dd TS |
2030 | } |
2031 | ||
2032 | return ret; | |
83f64091 FB |
2033 | } |
2034 | ||
40b4f539 KW |
2035 | |
2036 | typedef struct MultiwriteCB { | |
2037 | int error; | |
2038 | int num_requests; | |
2039 | int num_callbacks; | |
2040 | struct { | |
2041 | BlockDriverCompletionFunc *cb; | |
2042 | void *opaque; | |
2043 | QEMUIOVector *free_qiov; | |
2044 | void *free_buf; | |
2045 | } callbacks[]; | |
2046 | } MultiwriteCB; | |
2047 | ||
2048 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2049 | { | |
2050 | int i; | |
2051 | ||
2052 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2053 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
2054 | if (mcb->callbacks[i].free_qiov) { |
2055 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2056 | } | |
40b4f539 | 2057 | qemu_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 2058 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
2059 | } |
2060 | } | |
2061 | ||
2062 | static void multiwrite_cb(void *opaque, int ret) | |
2063 | { | |
2064 | MultiwriteCB *mcb = opaque; | |
2065 | ||
cb6d3ca0 | 2066 | if (ret < 0 && !mcb->error) { |
40b4f539 | 2067 | mcb->error = ret; |
40b4f539 KW |
2068 | } |
2069 | ||
2070 | mcb->num_requests--; | |
2071 | if (mcb->num_requests == 0) { | |
de189a1b | 2072 | multiwrite_user_cb(mcb); |
40b4f539 KW |
2073 | qemu_free(mcb); |
2074 | } | |
2075 | } | |
2076 | ||
2077 | static int multiwrite_req_compare(const void *a, const void *b) | |
2078 | { | |
77be4366 CH |
2079 | const BlockRequest *req1 = a, *req2 = b; |
2080 | ||
2081 | /* | |
2082 | * Note that we can't simply subtract req2->sector from req1->sector | |
2083 | * here as that could overflow the return value. | |
2084 | */ | |
2085 | if (req1->sector > req2->sector) { | |
2086 | return 1; | |
2087 | } else if (req1->sector < req2->sector) { | |
2088 | return -1; | |
2089 | } else { | |
2090 | return 0; | |
2091 | } | |
40b4f539 KW |
2092 | } |
2093 | ||
2094 | /* | |
2095 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2096 | * requests that remain after merging. | |
2097 | */ | |
2098 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2099 | int num_reqs, MultiwriteCB *mcb) | |
2100 | { | |
2101 | int i, outidx; | |
2102 | ||
2103 | // Sort requests by start sector | |
2104 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2105 | ||
2106 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2107 | // filling up gaps with zero sectors. | |
2108 | outidx = 0; | |
2109 | for (i = 1; i < num_reqs; i++) { | |
2110 | int merge = 0; | |
2111 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2112 | ||
2113 | // This handles the cases that are valid for all block drivers, namely | |
2114 | // exactly sequential writes and overlapping writes. | |
2115 | if (reqs[i].sector <= oldreq_last) { | |
2116 | merge = 1; | |
2117 | } | |
2118 | ||
2119 | // The block driver may decide that it makes sense to combine requests | |
2120 | // even if there is a gap of some sectors between them. In this case, | |
2121 | // the gap is filled with zeros (therefore only applicable for yet | |
2122 | // unused space in format like qcow2). | |
2123 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2124 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2125 | } | |
2126 | ||
e2a305fb CH |
2127 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2128 | merge = 0; | |
2129 | } | |
2130 | ||
40b4f539 KW |
2131 | if (merge) { |
2132 | size_t size; | |
2133 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
2134 | qemu_iovec_init(qiov, | |
2135 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2136 | ||
2137 | // Add the first request to the merged one. If the requests are | |
2138 | // overlapping, drop the last sectors of the first request. | |
2139 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2140 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2141 | ||
2142 | // We might need to add some zeros between the two requests | |
2143 | if (reqs[i].sector > oldreq_last) { | |
2144 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2145 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2146 | memset(buf, 0, zero_bytes); | |
2147 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2148 | mcb->callbacks[i].free_buf = buf; | |
2149 | } | |
2150 | ||
2151 | // Add the second request | |
2152 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2153 | ||
cbf1dff2 | 2154 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
2155 | reqs[outidx].qiov = qiov; |
2156 | ||
2157 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2158 | } else { | |
2159 | outidx++; | |
2160 | reqs[outidx].sector = reqs[i].sector; | |
2161 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2162 | reqs[outidx].qiov = reqs[i].qiov; | |
2163 | } | |
2164 | } | |
2165 | ||
2166 | return outidx + 1; | |
2167 | } | |
2168 | ||
2169 | /* | |
2170 | * Submit multiple AIO write requests at once. | |
2171 | * | |
2172 | * On success, the function returns 0 and all requests in the reqs array have | |
2173 | * been submitted. In error case this function returns -1, and any of the | |
2174 | * requests may or may not be submitted yet. In particular, this means that the | |
2175 | * callback will be called for some of the requests, for others it won't. The | |
2176 | * caller must check the error field of the BlockRequest to wait for the right | |
2177 | * callbacks (if error != 0, no callback will be called). | |
2178 | * | |
2179 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2180 | * requests. However, the fields opaque and error are left unmodified as they | |
2181 | * are used to signal failure for a single request to the caller. | |
2182 | */ | |
2183 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2184 | { | |
2185 | BlockDriverAIOCB *acb; | |
2186 | MultiwriteCB *mcb; | |
2187 | int i; | |
2188 | ||
2189 | if (num_reqs == 0) { | |
2190 | return 0; | |
2191 | } | |
2192 | ||
2193 | // Create MultiwriteCB structure | |
2194 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2195 | mcb->num_requests = 0; | |
2196 | mcb->num_callbacks = num_reqs; | |
2197 | ||
2198 | for (i = 0; i < num_reqs; i++) { | |
2199 | mcb->callbacks[i].cb = reqs[i].cb; | |
2200 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2201 | } | |
2202 | ||
2203 | // Check for mergable requests | |
2204 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2205 | ||
453f9a16 KW |
2206 | /* |
2207 | * Run the aio requests. As soon as one request can't be submitted | |
2208 | * successfully, fail all requests that are not yet submitted (we must | |
2209 | * return failure for all requests anyway) | |
2210 | * | |
2211 | * num_requests cannot be set to the right value immediately: If | |
2212 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2213 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2214 | * request as completed. We also cannot use the loop variable i to set it | |
2215 | * when the first request fails because the callback may already have been | |
2216 | * called for previously submitted requests. Thus, num_requests must be | |
2217 | * incremented for each request that is submitted. | |
2218 | * | |
2219 | * The problem that callbacks may be called early also means that we need | |
2220 | * to take care that num_requests doesn't become 0 before all requests are | |
2221 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2222 | * completed. A dummy request that is "completed" by a manual call to | |
2223 | * multiwrite_cb() takes care of this. | |
2224 | */ | |
2225 | mcb->num_requests = 1; | |
2226 | ||
40b4f539 | 2227 | for (i = 0; i < num_reqs; i++) { |
453f9a16 | 2228 | mcb->num_requests++; |
40b4f539 KW |
2229 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2230 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2231 | ||
2232 | if (acb == NULL) { | |
2233 | // We can only fail the whole thing if no request has been | |
2234 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2235 | // complete and report the error in the callback. | |
453f9a16 | 2236 | if (i == 0) { |
40b4f539 KW |
2237 | goto fail; |
2238 | } else { | |
7eb58a6c | 2239 | multiwrite_cb(mcb, -EIO); |
40b4f539 KW |
2240 | break; |
2241 | } | |
40b4f539 KW |
2242 | } |
2243 | } | |
2244 | ||
453f9a16 KW |
2245 | /* Complete the dummy request */ |
2246 | multiwrite_cb(mcb, 0); | |
2247 | ||
40b4f539 KW |
2248 | return 0; |
2249 | ||
2250 | fail: | |
453f9a16 KW |
2251 | for (i = 0; i < mcb->num_callbacks; i++) { |
2252 | reqs[i].error = -EIO; | |
2253 | } | |
af474591 | 2254 | qemu_free(mcb); |
40b4f539 KW |
2255 | return -1; |
2256 | } | |
2257 | ||
b2e12bc6 CH |
2258 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2259 | BlockDriverCompletionFunc *cb, void *opaque) | |
2260 | { | |
2261 | BlockDriver *drv = bs->drv; | |
2262 | ||
016f5cf6 AG |
2263 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
2264 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2265 | } | |
2266 | ||
b2e12bc6 CH |
2267 | if (!drv) |
2268 | return NULL; | |
b2e12bc6 CH |
2269 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2270 | } | |
2271 | ||
83f64091 | 2272 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2273 | { |
6bbff9a0 | 2274 | acb->pool->cancel(acb); |
83f64091 FB |
2275 | } |
2276 | ||
ce1a14dc | 2277 | |
83f64091 FB |
2278 | /**************************************************************/ |
2279 | /* async block device emulation */ | |
2280 | ||
c16b5a2c CH |
2281 | typedef struct BlockDriverAIOCBSync { |
2282 | BlockDriverAIOCB common; | |
2283 | QEMUBH *bh; | |
2284 | int ret; | |
2285 | /* vector translation state */ | |
2286 | QEMUIOVector *qiov; | |
2287 | uint8_t *bounce; | |
2288 | int is_write; | |
2289 | } BlockDriverAIOCBSync; | |
2290 | ||
2291 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2292 | { | |
b666d239 KW |
2293 | BlockDriverAIOCBSync *acb = |
2294 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 2295 | qemu_bh_delete(acb->bh); |
36afc451 | 2296 | acb->bh = NULL; |
c16b5a2c CH |
2297 | qemu_aio_release(acb); |
2298 | } | |
2299 | ||
2300 | static AIOPool bdrv_em_aio_pool = { | |
2301 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2302 | .cancel = bdrv_aio_cancel_em, | |
2303 | }; | |
2304 | ||
ce1a14dc | 2305 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2306 | { |
ce1a14dc | 2307 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2308 | |
f141eafe AL |
2309 | if (!acb->is_write) |
2310 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2311 | qemu_vfree(acb->bounce); |
ce1a14dc | 2312 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2313 | qemu_bh_delete(acb->bh); |
36afc451 | 2314 | acb->bh = NULL; |
ce1a14dc | 2315 | qemu_aio_release(acb); |
83f64091 | 2316 | } |
beac80cd | 2317 | |
f141eafe AL |
2318 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2319 | int64_t sector_num, | |
2320 | QEMUIOVector *qiov, | |
2321 | int nb_sectors, | |
2322 | BlockDriverCompletionFunc *cb, | |
2323 | void *opaque, | |
2324 | int is_write) | |
2325 | ||
83f64091 | 2326 | { |
ce1a14dc | 2327 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2328 | |
c16b5a2c | 2329 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2330 | acb->is_write = is_write; |
2331 | acb->qiov = qiov; | |
e268ca52 | 2332 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2333 | |
ce1a14dc PB |
2334 | if (!acb->bh) |
2335 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2336 | |
2337 | if (is_write) { | |
2338 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2339 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2340 | } else { | |
2341 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2342 | } | |
2343 | ||
ce1a14dc | 2344 | qemu_bh_schedule(acb->bh); |
f141eafe | 2345 | |
ce1a14dc | 2346 | return &acb->common; |
beac80cd FB |
2347 | } |
2348 | ||
f141eafe AL |
2349 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2350 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2351 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2352 | { |
f141eafe AL |
2353 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2354 | } | |
83f64091 | 2355 | |
f141eafe AL |
2356 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2357 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2358 | BlockDriverCompletionFunc *cb, void *opaque) | |
2359 | { | |
2360 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2361 | } |
beac80cd | 2362 | |
b2e12bc6 CH |
2363 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2364 | BlockDriverCompletionFunc *cb, void *opaque) | |
2365 | { | |
2366 | BlockDriverAIOCBSync *acb; | |
2367 | ||
2368 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2369 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2370 | acb->qiov = NULL; | |
2371 | acb->bounce = NULL; | |
2372 | acb->ret = 0; | |
2373 | ||
2374 | if (!acb->bh) | |
2375 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2376 | ||
2377 | bdrv_flush(bs); | |
2378 | qemu_bh_schedule(acb->bh); | |
2379 | return &acb->common; | |
2380 | } | |
2381 | ||
016f5cf6 AG |
2382 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
2383 | BlockDriverCompletionFunc *cb, void *opaque) | |
2384 | { | |
2385 | BlockDriverAIOCBSync *acb; | |
2386 | ||
2387 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2388 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2389 | acb->qiov = NULL; | |
2390 | acb->bounce = NULL; | |
2391 | acb->ret = 0; | |
2392 | ||
2393 | if (!acb->bh) { | |
2394 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2395 | } | |
2396 | ||
2397 | qemu_bh_schedule(acb->bh); | |
2398 | return &acb->common; | |
2399 | } | |
2400 | ||
83f64091 FB |
2401 | /**************************************************************/ |
2402 | /* sync block device emulation */ | |
ea2384d3 | 2403 | |
83f64091 FB |
2404 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2405 | { | |
2406 | *(int *)opaque = ret; | |
ea2384d3 FB |
2407 | } |
2408 | ||
83f64091 FB |
2409 | #define NOT_DONE 0x7fffffff |
2410 | ||
5fafdf24 | 2411 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2412 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2413 | { |
ce1a14dc PB |
2414 | int async_ret; |
2415 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2416 | struct iovec iov; |
2417 | QEMUIOVector qiov; | |
83f64091 | 2418 | |
65d6b3d8 KW |
2419 | async_context_push(); |
2420 | ||
83f64091 | 2421 | async_ret = NOT_DONE; |
3f4cb3d3 | 2422 | iov.iov_base = (void *)buf; |
eb5a3165 | 2423 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2424 | qemu_iovec_init_external(&qiov, &iov, 1); |
2425 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2426 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2427 | if (acb == NULL) { |
2428 | async_ret = -1; | |
2429 | goto fail; | |
2430 | } | |
baf35cb9 | 2431 | |
83f64091 FB |
2432 | while (async_ret == NOT_DONE) { |
2433 | qemu_aio_wait(); | |
2434 | } | |
baf35cb9 | 2435 | |
65d6b3d8 KW |
2436 | |
2437 | fail: | |
2438 | async_context_pop(); | |
83f64091 | 2439 | return async_ret; |
7a6cba61 PB |
2440 | } |
2441 | ||
83f64091 FB |
2442 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2443 | const uint8_t *buf, int nb_sectors) | |
2444 | { | |
ce1a14dc PB |
2445 | int async_ret; |
2446 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2447 | struct iovec iov; |
2448 | QEMUIOVector qiov; | |
83f64091 | 2449 | |
65d6b3d8 KW |
2450 | async_context_push(); |
2451 | ||
83f64091 | 2452 | async_ret = NOT_DONE; |
f141eafe | 2453 | iov.iov_base = (void *)buf; |
eb5a3165 | 2454 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2455 | qemu_iovec_init_external(&qiov, &iov, 1); |
2456 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2457 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2458 | if (acb == NULL) { |
2459 | async_ret = -1; | |
2460 | goto fail; | |
2461 | } | |
83f64091 FB |
2462 | while (async_ret == NOT_DONE) { |
2463 | qemu_aio_wait(); | |
2464 | } | |
65d6b3d8 KW |
2465 | |
2466 | fail: | |
2467 | async_context_pop(); | |
83f64091 FB |
2468 | return async_ret; |
2469 | } | |
ea2384d3 FB |
2470 | |
2471 | void bdrv_init(void) | |
2472 | { | |
5efa9d5a | 2473 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2474 | } |
ce1a14dc | 2475 | |
eb852011 MA |
2476 | void bdrv_init_with_whitelist(void) |
2477 | { | |
2478 | use_bdrv_whitelist = 1; | |
2479 | bdrv_init(); | |
2480 | } | |
2481 | ||
c16b5a2c CH |
2482 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2483 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2484 | { |
ce1a14dc PB |
2485 | BlockDriverAIOCB *acb; |
2486 | ||
6bbff9a0 AL |
2487 | if (pool->free_aiocb) { |
2488 | acb = pool->free_aiocb; | |
2489 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2490 | } else { |
6bbff9a0 AL |
2491 | acb = qemu_mallocz(pool->aiocb_size); |
2492 | acb->pool = pool; | |
ce1a14dc PB |
2493 | } |
2494 | acb->bs = bs; | |
2495 | acb->cb = cb; | |
2496 | acb->opaque = opaque; | |
2497 | return acb; | |
2498 | } | |
2499 | ||
2500 | void qemu_aio_release(void *p) | |
2501 | { | |
6bbff9a0 AL |
2502 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2503 | AIOPool *pool = acb->pool; | |
2504 | acb->next = pool->free_aiocb; | |
2505 | pool->free_aiocb = acb; | |
ce1a14dc | 2506 | } |
19cb3738 FB |
2507 | |
2508 | /**************************************************************/ | |
2509 | /* removable device support */ | |
2510 | ||
2511 | /** | |
2512 | * Return TRUE if the media is present | |
2513 | */ | |
2514 | int bdrv_is_inserted(BlockDriverState *bs) | |
2515 | { | |
2516 | BlockDriver *drv = bs->drv; | |
2517 | int ret; | |
2518 | if (!drv) | |
2519 | return 0; | |
2520 | if (!drv->bdrv_is_inserted) | |
2521 | return 1; | |
2522 | ret = drv->bdrv_is_inserted(bs); | |
2523 | return ret; | |
2524 | } | |
2525 | ||
2526 | /** | |
2527 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2528 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2529 | */ |
2530 | int bdrv_media_changed(BlockDriverState *bs) | |
2531 | { | |
2532 | BlockDriver *drv = bs->drv; | |
2533 | int ret; | |
2534 | ||
2535 | if (!drv || !drv->bdrv_media_changed) | |
2536 | ret = -ENOTSUP; | |
2537 | else | |
2538 | ret = drv->bdrv_media_changed(bs); | |
2539 | if (ret == -ENOTSUP) | |
2540 | ret = bs->media_changed; | |
2541 | bs->media_changed = 0; | |
2542 | return ret; | |
2543 | } | |
2544 | ||
2545 | /** | |
2546 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2547 | */ | |
aea2a33c | 2548 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2549 | { |
2550 | BlockDriver *drv = bs->drv; | |
2551 | int ret; | |
2552 | ||
aea2a33c MM |
2553 | if (bs->locked) { |
2554 | return -EBUSY; | |
2555 | } | |
2556 | ||
19cb3738 FB |
2557 | if (!drv || !drv->bdrv_eject) { |
2558 | ret = -ENOTSUP; | |
2559 | } else { | |
2560 | ret = drv->bdrv_eject(bs, eject_flag); | |
2561 | } | |
2562 | if (ret == -ENOTSUP) { | |
2563 | if (eject_flag) | |
2564 | bdrv_close(bs); | |
aea2a33c | 2565 | ret = 0; |
19cb3738 | 2566 | } |
aea2a33c MM |
2567 | |
2568 | return ret; | |
19cb3738 FB |
2569 | } |
2570 | ||
2571 | int bdrv_is_locked(BlockDriverState *bs) | |
2572 | { | |
2573 | return bs->locked; | |
2574 | } | |
2575 | ||
2576 | /** | |
2577 | * Lock or unlock the media (if it is locked, the user won't be able | |
2578 | * to eject it manually). | |
2579 | */ | |
2580 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2581 | { | |
2582 | BlockDriver *drv = bs->drv; | |
2583 | ||
2584 | bs->locked = locked; | |
2585 | if (drv && drv->bdrv_set_locked) { | |
2586 | drv->bdrv_set_locked(bs, locked); | |
2587 | } | |
2588 | } | |
985a03b0 TS |
2589 | |
2590 | /* needed for generic scsi interface */ | |
2591 | ||
2592 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2593 | { | |
2594 | BlockDriver *drv = bs->drv; | |
2595 | ||
2596 | if (drv && drv->bdrv_ioctl) | |
2597 | return drv->bdrv_ioctl(bs, req, buf); | |
2598 | return -ENOTSUP; | |
2599 | } | |
7d780669 | 2600 | |
221f715d AL |
2601 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2602 | unsigned long int req, void *buf, | |
2603 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2604 | { |
221f715d | 2605 | BlockDriver *drv = bs->drv; |
7d780669 | 2606 | |
221f715d AL |
2607 | if (drv && drv->bdrv_aio_ioctl) |
2608 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2609 | return NULL; | |
7d780669 | 2610 | } |
e268ca52 | 2611 | |
7cd1e32a | 2612 | |
2613 | ||
e268ca52 AL |
2614 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2615 | { | |
2616 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2617 | } | |
7cd1e32a | 2618 | |
2619 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2620 | { | |
2621 | int64_t bitmap_size; | |
a55eb92c | 2622 | |
aaa0eb75 | 2623 | bs->dirty_count = 0; |
a55eb92c | 2624 | if (enable) { |
c6d22830 JK |
2625 | if (!bs->dirty_bitmap) { |
2626 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2627 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2628 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2629 | |
7cd1e32a | 2630 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2631 | } |
7cd1e32a | 2632 | } else { |
c6d22830 | 2633 | if (bs->dirty_bitmap) { |
7cd1e32a | 2634 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2635 | bs->dirty_bitmap = NULL; |
a55eb92c | 2636 | } |
7cd1e32a | 2637 | } |
2638 | } | |
2639 | ||
2640 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2641 | { | |
6ea44308 | 2642 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2643 | |
c6d22830 JK |
2644 | if (bs->dirty_bitmap && |
2645 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2646 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2647 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2648 | } else { |
2649 | return 0; | |
2650 | } | |
2651 | } | |
2652 | ||
a55eb92c JK |
2653 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2654 | int nr_sectors) | |
7cd1e32a | 2655 | { |
2656 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2657 | } | |
aaa0eb75 LS |
2658 | |
2659 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2660 | { | |
2661 | return bs->dirty_count; | |
2662 | } |