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1 | /* | |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
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 | */ | |
24 | #include "vl.h" | |
25 | #include "block_int.h" | |
26 | ||
27 | #ifdef _BSD | |
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/ioctl.h> | |
31 | #include <sys/queue.h> | |
32 | #include <sys/disk.h> | |
33 | #endif | |
34 | ||
35 | #define SECTOR_BITS 9 | |
36 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
37 | ||
38 | typedef struct BlockDriverAIOCBSync { | |
39 | BlockDriverAIOCB common; | |
40 | QEMUBH *bh; | |
41 | int ret; | |
42 | } BlockDriverAIOCBSync; | |
43 | ||
44 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, | |
45 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
46 | BlockDriverCompletionFunc *cb, void *opaque); | |
47 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
48 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
49 | BlockDriverCompletionFunc *cb, void *opaque); | |
50 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); | |
51 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
52 | uint8_t *buf, int nb_sectors); | |
53 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
54 | const uint8_t *buf, int nb_sectors); | |
55 | ||
56 | static BlockDriverState *bdrv_first; | |
57 | static BlockDriver *first_drv; | |
58 | ||
59 | #ifdef _WIN32 | |
60 | #define PATH_SEP '\\' | |
61 | #else | |
62 | #define PATH_SEP '/' | |
63 | #endif | |
64 | ||
65 | int path_is_absolute(const char *path) | |
66 | { | |
67 | const char *p; | |
68 | p = strchr(path, ':'); | |
69 | if (p) | |
70 | p++; | |
71 | else | |
72 | p = path; | |
73 | return (*p == PATH_SEP); | |
74 | } | |
75 | ||
76 | /* if filename is absolute, just copy it to dest. Otherwise, build a | |
77 | path to it by considering it is relative to base_path. URL are | |
78 | supported. */ | |
79 | void path_combine(char *dest, int dest_size, | |
80 | const char *base_path, | |
81 | const char *filename) | |
82 | { | |
83 | const char *p, *p1; | |
84 | int len; | |
85 | ||
86 | if (dest_size <= 0) | |
87 | return; | |
88 | if (path_is_absolute(filename)) { | |
89 | pstrcpy(dest, dest_size, filename); | |
90 | } else { | |
91 | p = strchr(base_path, ':'); | |
92 | if (p) | |
93 | p++; | |
94 | else | |
95 | p = base_path; | |
96 | p1 = strrchr(base_path, PATH_SEP); | |
97 | if (p1) | |
98 | p1++; | |
99 | else | |
100 | p1 = base_path; | |
101 | if (p1 > p) | |
102 | p = p1; | |
103 | len = p - base_path; | |
104 | if (len > dest_size - 1) | |
105 | len = dest_size - 1; | |
106 | memcpy(dest, base_path, len); | |
107 | dest[len] = '\0'; | |
108 | pstrcat(dest, dest_size, filename); | |
109 | } | |
110 | } | |
111 | ||
112 | ||
113 | void bdrv_register(BlockDriver *bdrv) | |
114 | { | |
115 | if (!bdrv->bdrv_aio_read) { | |
116 | /* add AIO emulation layer */ | |
117 | bdrv->bdrv_aio_read = bdrv_aio_read_em; | |
118 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
119 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
120 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); | |
121 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { | |
122 | /* add synchronous IO emulation layer */ | |
123 | bdrv->bdrv_read = bdrv_read_em; | |
124 | bdrv->bdrv_write = bdrv_write_em; | |
125 | } | |
126 | bdrv->next = first_drv; | |
127 | first_drv = bdrv; | |
128 | } | |
129 | ||
130 | /* create a new block device (by default it is empty) */ | |
131 | BlockDriverState *bdrv_new(const char *device_name) | |
132 | { | |
133 | BlockDriverState **pbs, *bs; | |
134 | ||
135 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
136 | if(!bs) | |
137 | return NULL; | |
138 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
139 | if (device_name[0] != '\0') { | |
140 | /* insert at the end */ | |
141 | pbs = &bdrv_first; | |
142 | while (*pbs != NULL) | |
143 | pbs = &(*pbs)->next; | |
144 | *pbs = bs; | |
145 | } | |
146 | return bs; | |
147 | } | |
148 | ||
149 | BlockDriver *bdrv_find_format(const char *format_name) | |
150 | { | |
151 | BlockDriver *drv1; | |
152 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
153 | if (!strcmp(drv1->format_name, format_name)) | |
154 | return drv1; | |
155 | } | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | int bdrv_create(BlockDriver *drv, | |
160 | const char *filename, int64_t size_in_sectors, | |
161 | const char *backing_file, int flags) | |
162 | { | |
163 | if (!drv->bdrv_create) | |
164 | return -ENOTSUP; | |
165 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
166 | } | |
167 | ||
168 | #ifdef _WIN32 | |
169 | void get_tmp_filename(char *filename, int size) | |
170 | { | |
171 | tmpnam(filename); | |
172 | } | |
173 | #else | |
174 | void get_tmp_filename(char *filename, int size) | |
175 | { | |
176 | int fd; | |
177 | /* XXX: race condition possible */ | |
178 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); | |
179 | fd = mkstemp(filename); | |
180 | close(fd); | |
181 | } | |
182 | #endif | |
183 | ||
184 | static BlockDriver *find_protocol(const char *filename) | |
185 | { | |
186 | BlockDriver *drv1; | |
187 | char protocol[128]; | |
188 | int len; | |
189 | const char *p; | |
190 | p = strchr(filename, ':'); | |
191 | if (!p) | |
192 | return &bdrv_raw; | |
193 | len = p - filename; | |
194 | if (len > sizeof(protocol) - 1) | |
195 | len = sizeof(protocol) - 1; | |
196 | #ifdef _WIN32 | |
197 | if (len == 1) { | |
198 | /* specific win32 case for driver letters */ | |
199 | return &bdrv_raw; | |
200 | } | |
201 | #endif | |
202 | memcpy(protocol, filename, len); | |
203 | protocol[len] = '\0'; | |
204 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
205 | if (drv1->protocol_name && | |
206 | !strcmp(drv1->protocol_name, protocol)) | |
207 | return drv1; | |
208 | } | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | /* XXX: force raw format if block or character device ? It would | |
213 | simplify the BSD case */ | |
214 | static BlockDriver *find_image_format(const char *filename) | |
215 | { | |
216 | int ret, score, score_max; | |
217 | BlockDriver *drv1, *drv; | |
218 | uint8_t buf[2048]; | |
219 | BlockDriverState *bs; | |
220 | ||
221 | drv = find_protocol(filename); | |
222 | /* no need to test disk image formats for vvfat or host specific | |
223 | devices */ | |
224 | if (drv == &bdrv_vvfat) | |
225 | return drv; | |
226 | if (strstart(filename, "/dev/", NULL)) | |
227 | return &bdrv_raw; | |
228 | ||
229 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); | |
230 | if (ret < 0) | |
231 | return NULL; | |
232 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
233 | bdrv_delete(bs); | |
234 | if (ret < 0) { | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | score_max = 0; | |
239 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
240 | if (drv1->bdrv_probe) { | |
241 | score = drv1->bdrv_probe(buf, ret, filename); | |
242 | if (score > score_max) { | |
243 | score_max = score; | |
244 | drv = drv1; | |
245 | } | |
246 | } | |
247 | } | |
248 | return drv; | |
249 | } | |
250 | ||
251 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) | |
252 | { | |
253 | BlockDriverState *bs; | |
254 | int ret; | |
255 | ||
256 | bs = bdrv_new(""); | |
257 | if (!bs) | |
258 | return -ENOMEM; | |
259 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
260 | if (ret < 0) { | |
261 | bdrv_delete(bs); | |
262 | return ret; | |
263 | } | |
264 | *pbs = bs; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
269 | { | |
270 | return bdrv_open2(bs, filename, flags, NULL); | |
271 | } | |
272 | ||
273 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, | |
274 | BlockDriver *drv) | |
275 | { | |
276 | int ret, open_flags; | |
277 | char tmp_filename[1024]; | |
278 | char backing_filename[1024]; | |
279 | ||
280 | bs->read_only = 0; | |
281 | bs->is_temporary = 0; | |
282 | bs->encrypted = 0; | |
283 | ||
284 | if (flags & BDRV_O_SNAPSHOT) { | |
285 | BlockDriverState *bs1; | |
286 | int64_t total_size; | |
287 | ||
288 | /* if snapshot, we create a temporary backing file and open it | |
289 | instead of opening 'filename' directly */ | |
290 | ||
291 | /* if there is a backing file, use it */ | |
292 | bs1 = bdrv_new(""); | |
293 | if (!bs1) { | |
294 | return -ENOMEM; | |
295 | } | |
296 | if (bdrv_open(bs1, filename, 0) < 0) { | |
297 | bdrv_delete(bs1); | |
298 | return -1; | |
299 | } | |
300 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; | |
301 | bdrv_delete(bs1); | |
302 | ||
303 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
304 | if (bdrv_create(&bdrv_qcow2, tmp_filename, | |
305 | total_size, filename, 0) < 0) { | |
306 | return -1; | |
307 | } | |
308 | filename = tmp_filename; | |
309 | bs->is_temporary = 1; | |
310 | } | |
311 | ||
312 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
313 | if (flags & BDRV_O_FILE) { | |
314 | drv = find_protocol(filename); | |
315 | if (!drv) | |
316 | return -ENOENT; | |
317 | } else { | |
318 | if (!drv) { | |
319 | drv = find_image_format(filename); | |
320 | if (!drv) | |
321 | return -1; | |
322 | } | |
323 | } | |
324 | bs->drv = drv; | |
325 | bs->opaque = qemu_mallocz(drv->instance_size); | |
326 | if (bs->opaque == NULL && drv->instance_size > 0) | |
327 | return -1; | |
328 | /* Note: for compatibility, we open disk image files as RDWR, and | |
329 | RDONLY as fallback */ | |
330 | if (!(flags & BDRV_O_FILE)) | |
331 | open_flags = BDRV_O_RDWR; | |
332 | else | |
333 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
334 | ret = drv->bdrv_open(bs, filename, open_flags); | |
335 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { | |
336 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); | |
337 | bs->read_only = 1; | |
338 | } | |
339 | if (ret < 0) { | |
340 | qemu_free(bs->opaque); | |
341 | return ret; | |
342 | } | |
343 | if (drv->bdrv_getlength) { | |
344 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
345 | } | |
346 | #ifndef _WIN32 | |
347 | if (bs->is_temporary) { | |
348 | unlink(filename); | |
349 | } | |
350 | #endif | |
351 | if (bs->backing_file[0] != '\0') { | |
352 | /* if there is a backing file, use it */ | |
353 | bs->backing_hd = bdrv_new(""); | |
354 | if (!bs->backing_hd) { | |
355 | fail: | |
356 | bdrv_close(bs); | |
357 | return -1; | |
358 | } | |
359 | path_combine(backing_filename, sizeof(backing_filename), | |
360 | filename, bs->backing_file); | |
361 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) | |
362 | goto fail; | |
363 | } | |
364 | ||
365 | bs->inserted = 1; | |
366 | ||
367 | /* call the change callback */ | |
368 | if (bs->change_cb) | |
369 | bs->change_cb(bs->change_opaque); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | void bdrv_close(BlockDriverState *bs) | |
375 | { | |
376 | if (bs->inserted) { | |
377 | if (bs->backing_hd) | |
378 | bdrv_delete(bs->backing_hd); | |
379 | bs->drv->bdrv_close(bs); | |
380 | qemu_free(bs->opaque); | |
381 | #ifdef _WIN32 | |
382 | if (bs->is_temporary) { | |
383 | unlink(bs->filename); | |
384 | } | |
385 | #endif | |
386 | bs->opaque = NULL; | |
387 | bs->drv = NULL; | |
388 | bs->inserted = 0; | |
389 | ||
390 | /* call the change callback */ | |
391 | if (bs->change_cb) | |
392 | bs->change_cb(bs->change_opaque); | |
393 | } | |
394 | } | |
395 | ||
396 | void bdrv_delete(BlockDriverState *bs) | |
397 | { | |
398 | /* XXX: remove the driver list */ | |
399 | bdrv_close(bs); | |
400 | qemu_free(bs); | |
401 | } | |
402 | ||
403 | /* commit COW file into the raw image */ | |
404 | int bdrv_commit(BlockDriverState *bs) | |
405 | { | |
406 | int64_t i, total_sectors; | |
407 | int n, j; | |
408 | unsigned char sector[512]; | |
409 | ||
410 | if (!bs->inserted) | |
411 | return -ENOENT; | |
412 | ||
413 | if (bs->read_only) { | |
414 | return -EACCES; | |
415 | } | |
416 | ||
417 | if (!bs->backing_hd) { | |
418 | return -ENOTSUP; | |
419 | } | |
420 | ||
421 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
422 | for (i = 0; i < total_sectors;) { | |
423 | if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) { | |
424 | for(j = 0; j < n; j++) { | |
425 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
426 | return -EIO; | |
427 | } | |
428 | ||
429 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
430 | return -EIO; | |
431 | } | |
432 | i++; | |
433 | } | |
434 | } else { | |
435 | i += n; | |
436 | } | |
437 | } | |
438 | ||
439 | if (bs->drv->bdrv_make_empty) | |
440 | return bs->drv->bdrv_make_empty(bs); | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | /* return < 0 if error */ | |
446 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
447 | uint8_t *buf, int nb_sectors) | |
448 | { | |
449 | BlockDriver *drv = bs->drv; | |
450 | ||
451 | if (!bs->inserted) | |
452 | return -1; | |
453 | ||
454 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
455 | memcpy(buf, bs->boot_sector_data, 512); | |
456 | sector_num++; | |
457 | nb_sectors--; | |
458 | buf += 512; | |
459 | if (nb_sectors == 0) | |
460 | return 0; | |
461 | } | |
462 | if (drv->bdrv_pread) { | |
463 | int ret, len; | |
464 | len = nb_sectors * 512; | |
465 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
466 | if (ret < 0) | |
467 | return ret; | |
468 | else if (ret != len) | |
469 | return -EIO; | |
470 | else | |
471 | return 0; | |
472 | } else { | |
473 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
474 | } | |
475 | } | |
476 | ||
477 | /* return < 0 if error */ | |
478 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
479 | const uint8_t *buf, int nb_sectors) | |
480 | { | |
481 | BlockDriver *drv = bs->drv; | |
482 | if (!bs->inserted) | |
483 | return -1; | |
484 | if (bs->read_only) | |
485 | return -1; | |
486 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
487 | memcpy(bs->boot_sector_data, buf, 512); | |
488 | } | |
489 | if (drv->bdrv_pwrite) { | |
490 | int ret, len; | |
491 | len = nb_sectors * 512; | |
492 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
493 | if (ret < 0) | |
494 | return ret; | |
495 | else if (ret != len) | |
496 | return -EIO; | |
497 | else | |
498 | return 0; | |
499 | } else { | |
500 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
501 | } | |
502 | } | |
503 | ||
504 | /* not necessary now */ | |
505 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, | |
506 | uint8_t *buf, int count1) | |
507 | { | |
508 | uint8_t tmp_buf[SECTOR_SIZE]; | |
509 | int len, nb_sectors, count; | |
510 | int64_t sector_num; | |
511 | ||
512 | count = count1; | |
513 | /* first read to align to sector start */ | |
514 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
515 | if (len > count) | |
516 | len = count; | |
517 | sector_num = offset >> SECTOR_BITS; | |
518 | if (len > 0) { | |
519 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
520 | return -EIO; | |
521 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
522 | count -= len; | |
523 | if (count == 0) | |
524 | return count1; | |
525 | sector_num++; | |
526 | buf += len; | |
527 | } | |
528 | ||
529 | /* read the sectors "in place" */ | |
530 | nb_sectors = count >> SECTOR_BITS; | |
531 | if (nb_sectors > 0) { | |
532 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
533 | return -EIO; | |
534 | sector_num += nb_sectors; | |
535 | len = nb_sectors << SECTOR_BITS; | |
536 | buf += len; | |
537 | count -= len; | |
538 | } | |
539 | ||
540 | /* add data from the last sector */ | |
541 | if (count > 0) { | |
542 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
543 | return -EIO; | |
544 | memcpy(buf, tmp_buf, count); | |
545 | } | |
546 | return count1; | |
547 | } | |
548 | ||
549 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, | |
550 | const uint8_t *buf, int count1) | |
551 | { | |
552 | uint8_t tmp_buf[SECTOR_SIZE]; | |
553 | int len, nb_sectors, count; | |
554 | int64_t sector_num; | |
555 | ||
556 | count = count1; | |
557 | /* first write to align to sector start */ | |
558 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
559 | if (len > count) | |
560 | len = count; | |
561 | sector_num = offset >> SECTOR_BITS; | |
562 | if (len > 0) { | |
563 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
564 | return -EIO; | |
565 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
566 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
567 | return -EIO; | |
568 | count -= len; | |
569 | if (count == 0) | |
570 | return count1; | |
571 | sector_num++; | |
572 | buf += len; | |
573 | } | |
574 | ||
575 | /* write the sectors "in place" */ | |
576 | nb_sectors = count >> SECTOR_BITS; | |
577 | if (nb_sectors > 0) { | |
578 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
579 | return -EIO; | |
580 | sector_num += nb_sectors; | |
581 | len = nb_sectors << SECTOR_BITS; | |
582 | buf += len; | |
583 | count -= len; | |
584 | } | |
585 | ||
586 | /* add data from the last sector */ | |
587 | if (count > 0) { | |
588 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
589 | return -EIO; | |
590 | memcpy(tmp_buf, buf, count); | |
591 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
592 | return -EIO; | |
593 | } | |
594 | return count1; | |
595 | } | |
596 | ||
597 | /** | |
598 | * Read with byte offsets (needed only for file protocols) | |
599 | */ | |
600 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
601 | void *buf1, int count1) | |
602 | { | |
603 | BlockDriver *drv = bs->drv; | |
604 | ||
605 | if (!drv) | |
606 | return -ENOENT; | |
607 | if (!drv->bdrv_pread) | |
608 | return bdrv_pread_em(bs, offset, buf1, count1); | |
609 | return drv->bdrv_pread(bs, offset, buf1, count1); | |
610 | } | |
611 | ||
612 | /** | |
613 | * Write with byte offsets (needed only for file protocols) | |
614 | */ | |
615 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
616 | const void *buf1, int count1) | |
617 | { | |
618 | BlockDriver *drv = bs->drv; | |
619 | ||
620 | if (!drv) | |
621 | return -ENOENT; | |
622 | if (!drv->bdrv_pwrite) | |
623 | return bdrv_pwrite_em(bs, offset, buf1, count1); | |
624 | return drv->bdrv_pwrite(bs, offset, buf1, count1); | |
625 | } | |
626 | ||
627 | /** | |
628 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
629 | */ | |
630 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
631 | { | |
632 | BlockDriver *drv = bs->drv; | |
633 | if (!drv) | |
634 | return -ENOENT; | |
635 | if (!drv->bdrv_truncate) | |
636 | return -ENOTSUP; | |
637 | return drv->bdrv_truncate(bs, offset); | |
638 | } | |
639 | ||
640 | /** | |
641 | * Length of a file in bytes. Return < 0 if error or unknown. | |
642 | */ | |
643 | int64_t bdrv_getlength(BlockDriverState *bs) | |
644 | { | |
645 | BlockDriver *drv = bs->drv; | |
646 | if (!drv) | |
647 | return -ENOENT; | |
648 | if (!drv->bdrv_getlength) { | |
649 | /* legacy mode */ | |
650 | return bs->total_sectors * SECTOR_SIZE; | |
651 | } | |
652 | return drv->bdrv_getlength(bs); | |
653 | } | |
654 | ||
655 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) | |
656 | { | |
657 | *nb_sectors_ptr = bs->total_sectors; | |
658 | } | |
659 | ||
660 | /* force a given boot sector. */ | |
661 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
662 | { | |
663 | bs->boot_sector_enabled = 1; | |
664 | if (size > 512) | |
665 | size = 512; | |
666 | memcpy(bs->boot_sector_data, data, size); | |
667 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
668 | } | |
669 | ||
670 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
671 | int cyls, int heads, int secs) | |
672 | { | |
673 | bs->cyls = cyls; | |
674 | bs->heads = heads; | |
675 | bs->secs = secs; | |
676 | } | |
677 | ||
678 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
679 | { | |
680 | bs->type = type; | |
681 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
682 | type == BDRV_TYPE_FLOPPY)); | |
683 | } | |
684 | ||
685 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) | |
686 | { | |
687 | bs->translation = translation; | |
688 | } | |
689 | ||
690 | void bdrv_get_geometry_hint(BlockDriverState *bs, | |
691 | int *pcyls, int *pheads, int *psecs) | |
692 | { | |
693 | *pcyls = bs->cyls; | |
694 | *pheads = bs->heads; | |
695 | *psecs = bs->secs; | |
696 | } | |
697 | ||
698 | int bdrv_get_type_hint(BlockDriverState *bs) | |
699 | { | |
700 | return bs->type; | |
701 | } | |
702 | ||
703 | int bdrv_get_translation_hint(BlockDriverState *bs) | |
704 | { | |
705 | return bs->translation; | |
706 | } | |
707 | ||
708 | int bdrv_is_removable(BlockDriverState *bs) | |
709 | { | |
710 | return bs->removable; | |
711 | } | |
712 | ||
713 | int bdrv_is_read_only(BlockDriverState *bs) | |
714 | { | |
715 | return bs->read_only; | |
716 | } | |
717 | ||
718 | int bdrv_is_inserted(BlockDriverState *bs) | |
719 | { | |
720 | return bs->inserted; | |
721 | } | |
722 | ||
723 | int bdrv_is_locked(BlockDriverState *bs) | |
724 | { | |
725 | return bs->locked; | |
726 | } | |
727 | ||
728 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
729 | { | |
730 | bs->locked = locked; | |
731 | } | |
732 | ||
733 | void bdrv_set_change_cb(BlockDriverState *bs, | |
734 | void (*change_cb)(void *opaque), void *opaque) | |
735 | { | |
736 | bs->change_cb = change_cb; | |
737 | bs->change_opaque = opaque; | |
738 | } | |
739 | ||
740 | int bdrv_is_encrypted(BlockDriverState *bs) | |
741 | { | |
742 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
743 | return 1; | |
744 | return bs->encrypted; | |
745 | } | |
746 | ||
747 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
748 | { | |
749 | int ret; | |
750 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
751 | ret = bdrv_set_key(bs->backing_hd, key); | |
752 | if (ret < 0) | |
753 | return ret; | |
754 | if (!bs->encrypted) | |
755 | return 0; | |
756 | } | |
757 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
758 | return -1; | |
759 | return bs->drv->bdrv_set_key(bs, key); | |
760 | } | |
761 | ||
762 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
763 | { | |
764 | if (!bs->inserted || !bs->drv) { | |
765 | buf[0] = '\0'; | |
766 | } else { | |
767 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
768 | } | |
769 | } | |
770 | ||
771 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
772 | void *opaque) | |
773 | { | |
774 | BlockDriver *drv; | |
775 | ||
776 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
777 | it(opaque, drv->format_name); | |
778 | } | |
779 | } | |
780 | ||
781 | BlockDriverState *bdrv_find(const char *name) | |
782 | { | |
783 | BlockDriverState *bs; | |
784 | ||
785 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
786 | if (!strcmp(name, bs->device_name)) | |
787 | return bs; | |
788 | } | |
789 | return NULL; | |
790 | } | |
791 | ||
792 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) | |
793 | { | |
794 | BlockDriverState *bs; | |
795 | ||
796 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
797 | it(opaque, bs->device_name); | |
798 | } | |
799 | } | |
800 | ||
801 | const char *bdrv_get_device_name(BlockDriverState *bs) | |
802 | { | |
803 | return bs->device_name; | |
804 | } | |
805 | ||
806 | void bdrv_flush(BlockDriverState *bs) | |
807 | { | |
808 | if (bs->drv->bdrv_flush) | |
809 | bs->drv->bdrv_flush(bs); | |
810 | if (bs->backing_hd) | |
811 | bdrv_flush(bs->backing_hd); | |
812 | } | |
813 | ||
814 | void bdrv_info(void) | |
815 | { | |
816 | BlockDriverState *bs; | |
817 | ||
818 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
819 | term_printf("%s:", bs->device_name); | |
820 | term_printf(" type="); | |
821 | switch(bs->type) { | |
822 | case BDRV_TYPE_HD: | |
823 | term_printf("hd"); | |
824 | break; | |
825 | case BDRV_TYPE_CDROM: | |
826 | term_printf("cdrom"); | |
827 | break; | |
828 | case BDRV_TYPE_FLOPPY: | |
829 | term_printf("floppy"); | |
830 | break; | |
831 | } | |
832 | term_printf(" removable=%d", bs->removable); | |
833 | if (bs->removable) { | |
834 | term_printf(" locked=%d", bs->locked); | |
835 | } | |
836 | if (bs->inserted) { | |
837 | term_printf(" file=%s", bs->filename); | |
838 | if (bs->backing_file[0] != '\0') | |
839 | term_printf(" backing_file=%s", bs->backing_file); | |
840 | term_printf(" ro=%d", bs->read_only); | |
841 | term_printf(" drv=%s", bs->drv->format_name); | |
842 | if (bs->encrypted) | |
843 | term_printf(" encrypted"); | |
844 | } else { | |
845 | term_printf(" [not inserted]"); | |
846 | } | |
847 | term_printf("\n"); | |
848 | } | |
849 | } | |
850 | ||
851 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
852 | char *filename, int filename_size) | |
853 | { | |
854 | if (!bs->backing_hd) { | |
855 | pstrcpy(filename, filename_size, ""); | |
856 | } else { | |
857 | pstrcpy(filename, filename_size, bs->backing_file); | |
858 | } | |
859 | } | |
860 | ||
861 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, | |
862 | const uint8_t *buf, int nb_sectors) | |
863 | { | |
864 | BlockDriver *drv = bs->drv; | |
865 | if (!drv) | |
866 | return -ENOENT; | |
867 | if (!drv->bdrv_write_compressed) | |
868 | return -ENOTSUP; | |
869 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
870 | } | |
871 | ||
872 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
873 | { | |
874 | BlockDriver *drv = bs->drv; | |
875 | if (!drv) | |
876 | return -ENOENT; | |
877 | if (!drv->bdrv_get_info) | |
878 | return -ENOTSUP; | |
879 | memset(bdi, 0, sizeof(*bdi)); | |
880 | return drv->bdrv_get_info(bs, bdi); | |
881 | } | |
882 | ||
883 | /**************************************************************/ | |
884 | /* handling of snapshots */ | |
885 | ||
886 | int bdrv_snapshot_create(BlockDriverState *bs, | |
887 | QEMUSnapshotInfo *sn_info) | |
888 | { | |
889 | BlockDriver *drv = bs->drv; | |
890 | if (!drv) | |
891 | return -ENOENT; | |
892 | if (!drv->bdrv_snapshot_create) | |
893 | return -ENOTSUP; | |
894 | return drv->bdrv_snapshot_create(bs, sn_info); | |
895 | } | |
896 | ||
897 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
898 | const char *snapshot_id) | |
899 | { | |
900 | BlockDriver *drv = bs->drv; | |
901 | if (!drv) | |
902 | return -ENOENT; | |
903 | if (!drv->bdrv_snapshot_goto) | |
904 | return -ENOTSUP; | |
905 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
906 | } | |
907 | ||
908 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
909 | { | |
910 | BlockDriver *drv = bs->drv; | |
911 | if (!drv) | |
912 | return -ENOENT; | |
913 | if (!drv->bdrv_snapshot_delete) | |
914 | return -ENOTSUP; | |
915 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
916 | } | |
917 | ||
918 | int bdrv_snapshot_list(BlockDriverState *bs, | |
919 | QEMUSnapshotInfo **psn_info) | |
920 | { | |
921 | BlockDriver *drv = bs->drv; | |
922 | if (!drv) | |
923 | return -ENOENT; | |
924 | if (!drv->bdrv_snapshot_list) | |
925 | return -ENOTSUP; | |
926 | return drv->bdrv_snapshot_list(bs, psn_info); | |
927 | } | |
928 | ||
929 | #define NB_SUFFIXES 4 | |
930 | ||
931 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
932 | { | |
933 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
934 | int64_t base; | |
935 | int i; | |
936 | ||
937 | if (size <= 999) { | |
938 | snprintf(buf, buf_size, "%" PRId64, size); | |
939 | } else { | |
940 | base = 1024; | |
941 | for(i = 0; i < NB_SUFFIXES; i++) { | |
942 | if (size < (10 * base)) { | |
943 | snprintf(buf, buf_size, "%0.1f%c", | |
944 | (double)size / base, | |
945 | suffixes[i]); | |
946 | break; | |
947 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
948 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
949 | ((size + (base >> 1)) / base), | |
950 | suffixes[i]); | |
951 | break; | |
952 | } | |
953 | base = base * 1024; | |
954 | } | |
955 | } | |
956 | return buf; | |
957 | } | |
958 | ||
959 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
960 | { | |
961 | char buf1[128], date_buf[128], clock_buf[128]; | |
962 | struct tm tm; | |
963 | time_t ti; | |
964 | int64_t secs; | |
965 | ||
966 | if (!sn) { | |
967 | snprintf(buf, buf_size, | |
968 | "%-10s%-20s%7s%20s%15s", | |
969 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
970 | } else { | |
971 | ti = sn->date_sec; | |
972 | #ifndef _WIN32 | |
973 | localtime_r(&ti, &tm); | |
974 | #endif | |
975 | strftime(date_buf, sizeof(date_buf), | |
976 | "%Y-%m-%d %H:%M:%S", &tm); | |
977 | secs = sn->vm_clock_nsec / 1000000000; | |
978 | snprintf(clock_buf, sizeof(clock_buf), | |
979 | "%02d:%02d:%02d.%03d", | |
980 | (int)(secs / 3600), | |
981 | (int)((secs / 60) % 60), | |
982 | (int)(secs % 60), | |
983 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
984 | snprintf(buf, buf_size, | |
985 | "%-10s%-20s%7s%20s%15s", | |
986 | sn->id_str, sn->name, | |
987 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
988 | date_buf, | |
989 | clock_buf); | |
990 | } | |
991 | return buf; | |
992 | } | |
993 | ||
994 | ||
995 | /**************************************************************/ | |
996 | /* async I/Os */ | |
997 | ||
998 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, | |
999 | uint8_t *buf, int nb_sectors, | |
1000 | BlockDriverCompletionFunc *cb, void *opaque) | |
1001 | { | |
1002 | BlockDriver *drv = bs->drv; | |
1003 | ||
1004 | if (!bs->inserted) | |
1005 | return NULL; | |
1006 | ||
1007 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ | |
1008 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
1009 | memcpy(buf, bs->boot_sector_data, 512); | |
1010 | sector_num++; | |
1011 | nb_sectors--; | |
1012 | buf += 512; | |
1013 | } | |
1014 | ||
1015 | return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); | |
1016 | } | |
1017 | ||
1018 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, | |
1019 | const uint8_t *buf, int nb_sectors, | |
1020 | BlockDriverCompletionFunc *cb, void *opaque) | |
1021 | { | |
1022 | BlockDriver *drv = bs->drv; | |
1023 | ||
1024 | if (!bs->inserted) | |
1025 | return NULL; | |
1026 | if (bs->read_only) | |
1027 | return NULL; | |
1028 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
1029 | memcpy(bs->boot_sector_data, buf, 512); | |
1030 | } | |
1031 | ||
1032 | return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); | |
1033 | } | |
1034 | ||
1035 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
1036 | { | |
1037 | BlockDriver *drv = acb->bs->drv; | |
1038 | ||
1039 | drv->bdrv_aio_cancel(acb); | |
1040 | } | |
1041 | ||
1042 | ||
1043 | /**************************************************************/ | |
1044 | /* async block device emulation */ | |
1045 | ||
1046 | #ifdef QEMU_TOOL | |
1047 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, | |
1048 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1049 | BlockDriverCompletionFunc *cb, void *opaque) | |
1050 | { | |
1051 | int ret; | |
1052 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1053 | cb(opaque, ret); | |
1054 | return NULL; | |
1055 | } | |
1056 | ||
1057 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
1058 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1059 | BlockDriverCompletionFunc *cb, void *opaque) | |
1060 | { | |
1061 | int ret; | |
1062 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1063 | cb(opaque, ret); | |
1064 | return NULL; | |
1065 | } | |
1066 | ||
1067 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) | |
1068 | { | |
1069 | } | |
1070 | #else | |
1071 | static void bdrv_aio_bh_cb(void *opaque) | |
1072 | { | |
1073 | BlockDriverAIOCBSync *acb = opaque; | |
1074 | acb->common.cb(acb->common.opaque, acb->ret); | |
1075 | qemu_aio_release(acb); | |
1076 | } | |
1077 | ||
1078 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, | |
1079 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1080 | BlockDriverCompletionFunc *cb, void *opaque) | |
1081 | { | |
1082 | BlockDriverAIOCBSync *acb; | |
1083 | int ret; | |
1084 | ||
1085 | acb = qemu_aio_get(bs, cb, opaque); | |
1086 | if (!acb->bh) | |
1087 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1088 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1089 | acb->ret = ret; | |
1090 | qemu_bh_schedule(acb->bh); | |
1091 | return &acb->common; | |
1092 | } | |
1093 | ||
1094 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
1095 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1096 | BlockDriverCompletionFunc *cb, void *opaque) | |
1097 | { | |
1098 | BlockDriverAIOCBSync *acb; | |
1099 | int ret; | |
1100 | ||
1101 | acb = qemu_aio_get(bs, cb, opaque); | |
1102 | if (!acb->bh) | |
1103 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1104 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1105 | acb->ret = ret; | |
1106 | qemu_bh_schedule(acb->bh); | |
1107 | return &acb->common; | |
1108 | } | |
1109 | ||
1110 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1111 | { | |
1112 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
1113 | qemu_bh_cancel(acb->bh); | |
1114 | qemu_aio_release(acb); | |
1115 | } | |
1116 | #endif /* !QEMU_TOOL */ | |
1117 | ||
1118 | /**************************************************************/ | |
1119 | /* sync block device emulation */ | |
1120 | ||
1121 | static void bdrv_rw_em_cb(void *opaque, int ret) | |
1122 | { | |
1123 | *(int *)opaque = ret; | |
1124 | } | |
1125 | ||
1126 | #define NOT_DONE 0x7fffffff | |
1127 | ||
1128 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
1129 | uint8_t *buf, int nb_sectors) | |
1130 | { | |
1131 | int async_ret; | |
1132 | BlockDriverAIOCB *acb; | |
1133 | ||
1134 | async_ret = NOT_DONE; | |
1135 | qemu_aio_wait_start(); | |
1136 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, | |
1137 | bdrv_rw_em_cb, &async_ret); | |
1138 | if (acb == NULL) { | |
1139 | qemu_aio_wait_end(); | |
1140 | return -1; | |
1141 | } | |
1142 | while (async_ret == NOT_DONE) { | |
1143 | qemu_aio_wait(); | |
1144 | } | |
1145 | qemu_aio_wait_end(); | |
1146 | return async_ret; | |
1147 | } | |
1148 | ||
1149 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
1150 | const uint8_t *buf, int nb_sectors) | |
1151 | { | |
1152 | int async_ret; | |
1153 | BlockDriverAIOCB *acb; | |
1154 | ||
1155 | async_ret = NOT_DONE; | |
1156 | qemu_aio_wait_start(); | |
1157 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, | |
1158 | bdrv_rw_em_cb, &async_ret); | |
1159 | if (acb == NULL) { | |
1160 | qemu_aio_wait_end(); | |
1161 | return -1; | |
1162 | } | |
1163 | while (async_ret == NOT_DONE) { | |
1164 | qemu_aio_wait(); | |
1165 | } | |
1166 | qemu_aio_wait_end(); | |
1167 | return async_ret; | |
1168 | } | |
1169 | ||
1170 | void bdrv_init(void) | |
1171 | { | |
1172 | bdrv_register(&bdrv_raw); | |
1173 | #ifndef _WIN32 | |
1174 | bdrv_register(&bdrv_cow); | |
1175 | #endif | |
1176 | bdrv_register(&bdrv_qcow); | |
1177 | bdrv_register(&bdrv_vmdk); | |
1178 | bdrv_register(&bdrv_cloop); | |
1179 | bdrv_register(&bdrv_dmg); | |
1180 | bdrv_register(&bdrv_bochs); | |
1181 | bdrv_register(&bdrv_vpc); | |
1182 | bdrv_register(&bdrv_vvfat); | |
1183 | bdrv_register(&bdrv_qcow2); | |
1184 | } | |
1185 | ||
1186 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, | |
1187 | void *opaque) | |
1188 | { | |
1189 | BlockDriver *drv; | |
1190 | BlockDriverAIOCB *acb; | |
1191 | ||
1192 | drv = bs->drv; | |
1193 | if (drv->free_aiocb) { | |
1194 | acb = drv->free_aiocb; | |
1195 | drv->free_aiocb = acb->next; | |
1196 | } else { | |
1197 | acb = qemu_mallocz(drv->aiocb_size); | |
1198 | if (!acb) | |
1199 | return NULL; | |
1200 | } | |
1201 | acb->bs = bs; | |
1202 | acb->cb = cb; | |
1203 | acb->opaque = opaque; | |
1204 | return acb; | |
1205 | } | |
1206 | ||
1207 | void qemu_aio_release(void *p) | |
1208 | { | |
1209 | BlockDriverAIOCB *acb = p; | |
1210 | BlockDriver *drv = acb->bs->drv; | |
1211 | acb->next = drv->free_aiocb; | |
1212 | drv->free_aiocb = acb; | |
1213 | } |