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QMP: Introduce VNC_INITIALIZED event
[qemu/agraf.git] / block.c
blob115e5913eb14bf54941aeb5981c39cbc282438df
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 "config-host.h"
25 #include "qemu-common.h"
26 #include "monitor.h"
27 #include "block_int.h"
28 #include "module.h"
29 #include "qemu-objects.h"
30
31 #ifdef CONFIG_BSD
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/ioctl.h>
35 #include <sys/queue.h>
36 #ifndef __DragonFly__
37 #include <sys/disk.h>
38 #endif
39 #endif
40
41 #ifdef _WIN32
42 #include <windows.h>
43 #endif
44
45 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
46 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
47 BlockDriverCompletionFunc *cb, void *opaque);
48 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
49 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
50 BlockDriverCompletionFunc *cb, void *opaque);
51 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
52 BlockDriverCompletionFunc *cb, void *opaque);
53 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
54 uint8_t *buf, int nb_sectors);
55 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
56 const uint8_t *buf, int nb_sectors);
57
58 BlockDriverState *bdrv_first;
59
60 static BlockDriver *first_drv;
61
62 /* If non-zero, use only whitelisted block drivers */
63 static int use_bdrv_whitelist;
64
65 int path_is_absolute(const char *path)
66 {
67 const char *p;
68 #ifdef _WIN32
69 /* specific case for names like: "\\.\d:" */
70 if (*path == '/' || *path == '\\')
71 return 1;
72 #endif
73 p = strchr(path, ':');
74 if (p)
75 p++;
76 else
77 p = path;
78 #ifdef _WIN32
79 return (*p == '/' || *p == '\\');
80 #else
81 return (*p == '/');
82 #endif
83 }
84
85 /* if filename is absolute, just copy it to dest. Otherwise, build a
86 path to it by considering it is relative to base_path. URL are
87 supported. */
88 void path_combine(char *dest, int dest_size,
89 const char *base_path,
90 const char *filename)
91 {
92 const char *p, *p1;
93 int len;
94
95 if (dest_size <= 0)
96 return;
97 if (path_is_absolute(filename)) {
98 pstrcpy(dest, dest_size, filename);
99 } else {
100 p = strchr(base_path, ':');
101 if (p)
102 p++;
103 else
104 p = base_path;
105 p1 = strrchr(base_path, '/');
106 #ifdef _WIN32
107 {
108 const char *p2;
109 p2 = strrchr(base_path, '\\');
110 if (!p1 || p2 > p1)
111 p1 = p2;
112 }
113 #endif
114 if (p1)
115 p1++;
116 else
117 p1 = base_path;
118 if (p1 > p)
119 p = p1;
120 len = p - base_path;
121 if (len > dest_size - 1)
122 len = dest_size - 1;
123 memcpy(dest, base_path, len);
124 dest[len] = '\0';
125 pstrcat(dest, dest_size, filename);
126 }
127 }
128
129 void bdrv_register(BlockDriver *bdrv)
130 {
131 if (!bdrv->bdrv_aio_readv) {
132 /* add AIO emulation layer */
133 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
134 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
135 } else if (!bdrv->bdrv_read) {
136 /* add synchronous IO emulation layer */
137 bdrv->bdrv_read = bdrv_read_em;
138 bdrv->bdrv_write = bdrv_write_em;
139 }
140
141 if (!bdrv->bdrv_aio_flush)
142 bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
143
144 bdrv->next = first_drv;
145 first_drv = bdrv;
146 }
147
148 /* create a new block device (by default it is empty) */
149 BlockDriverState *bdrv_new(const char *device_name)
150 {
151 BlockDriverState **pbs, *bs;
152
153 bs = qemu_mallocz(sizeof(BlockDriverState));
154 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
155 if (device_name[0] != '\0') {
156 /* insert at the end */
157 pbs = &bdrv_first;
158 while (*pbs != NULL)
159 pbs = &(*pbs)->next;
160 *pbs = bs;
161 }
162 return bs;
163 }
164
165 BlockDriver *bdrv_find_format(const char *format_name)
166 {
167 BlockDriver *drv1;
168 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
169 if (!strcmp(drv1->format_name, format_name))
170 return drv1;
171 }
172 return NULL;
173 }
174
175 static int bdrv_is_whitelisted(BlockDriver *drv)
176 {
177 static const char *whitelist[] = {
178 CONFIG_BDRV_WHITELIST
179 };
180 const char **p;
181
182 if (!whitelist[0])
183 return 1; /* no whitelist, anything goes */
184
185 for (p = whitelist; *p; p++) {
186 if (!strcmp(drv->format_name, *p)) {
187 return 1;
188 }
189 }
190 return 0;
191 }
192
193 BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
194 {
195 BlockDriver *drv = bdrv_find_format(format_name);
196 return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
197 }
198
199 int bdrv_create(BlockDriver *drv, const char* filename,
200 QEMUOptionParameter *options)
201 {
202 if (!drv->bdrv_create)
203 return -ENOTSUP;
204
205 return drv->bdrv_create(filename, options);
206 }
207
208 #ifdef _WIN32
209 void get_tmp_filename(char *filename, int size)
210 {
211 char temp_dir[MAX_PATH];
212
213 GetTempPath(MAX_PATH, temp_dir);
214 GetTempFileName(temp_dir, "qem", 0, filename);
215 }
216 #else
217 void get_tmp_filename(char *filename, int size)
218 {
219 int fd;
220 const char *tmpdir;
221 /* XXX: race condition possible */
222 tmpdir = getenv("TMPDIR");
223 if (!tmpdir)
224 tmpdir = "/tmp";
225 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
226 fd = mkstemp(filename);
227 close(fd);
228 }
229 #endif
230
231 #ifdef _WIN32
232 static int is_windows_drive_prefix(const char *filename)
233 {
234 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
235 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
236 filename[1] == ':');
237 }
238
239 int is_windows_drive(const char *filename)
240 {
241 if (is_windows_drive_prefix(filename) &&
242 filename[2] == '\0')
243 return 1;
244 if (strstart(filename, "\\\\.\\", NULL) ||
245 strstart(filename, "//./", NULL))
246 return 1;
247 return 0;
248 }
249 #endif
250
251 static BlockDriver *find_protocol(const char *filename)
252 {
253 BlockDriver *drv1;
254 char protocol[128];
255 int len;
256 const char *p;
257
258 #ifdef _WIN32
259 if (is_windows_drive(filename) ||
260 is_windows_drive_prefix(filename))
261 return bdrv_find_format("raw");
262 #endif
263 p = strchr(filename, ':');
264 if (!p)
265 return bdrv_find_format("raw");
266 len = p - filename;
267 if (len > sizeof(protocol) - 1)
268 len = sizeof(protocol) - 1;
269 memcpy(protocol, filename, len);
270 protocol[len] = '\0';
271 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
272 if (drv1->protocol_name &&
273 !strcmp(drv1->protocol_name, protocol))
274 return drv1;
275 }
276 return NULL;
277 }
278
279 /*
280 * Detect host devices. By convention, /dev/cdrom[N] is always
281 * recognized as a host CDROM.
282 */
283 static BlockDriver *find_hdev_driver(const char *filename)
284 {
285 int score_max = 0, score;
286 BlockDriver *drv = NULL, *d;
287
288 for (d = first_drv; d; d = d->next) {
289 if (d->bdrv_probe_device) {
290 score = d->bdrv_probe_device(filename);
291 if (score > score_max) {
292 score_max = score;
293 drv = d;
294 }
295 }
296 }
297
298 return drv;
299 }
300
301 static BlockDriver *find_image_format(const char *filename)
302 {
303 int ret, score, score_max;
304 BlockDriver *drv1, *drv;
305 uint8_t buf[2048];
306 BlockDriverState *bs;
307
308 drv = find_protocol(filename);
309 /* no need to test disk image formats for vvfat */
310 if (drv && strcmp(drv->format_name, "vvfat") == 0)
311 return drv;
312
313 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
314 if (ret < 0)
315 return NULL;
316 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
317 bdrv_delete(bs);
318 if (ret < 0) {
319 return NULL;
320 }
321
322 score_max = 0;
323 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
324 if (drv1->bdrv_probe) {
325 score = drv1->bdrv_probe(buf, ret, filename);
326 if (score > score_max) {
327 score_max = score;
328 drv = drv1;
329 }
330 }
331 }
332 return drv;
333 }
334
335 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
336 {
337 BlockDriverState *bs;
338 int ret;
339
340 bs = bdrv_new("");
341 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
342 if (ret < 0) {
343 bdrv_delete(bs);
344 return ret;
345 }
346 bs->growable = 1;
347 *pbs = bs;
348 return 0;
349 }
350
351 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
352 {
353 return bdrv_open2(bs, filename, flags, NULL);
354 }
355
356 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
357 BlockDriver *drv)
358 {
359 int ret, open_flags, try_rw;
360 char tmp_filename[PATH_MAX];
361 char backing_filename[PATH_MAX];
362
363 bs->is_temporary = 0;
364 bs->encrypted = 0;
365 bs->valid_key = 0;
366 /* buffer_alignment defaulted to 512, drivers can change this value */
367 bs->buffer_alignment = 512;
368
369 if (flags & BDRV_O_SNAPSHOT) {
370 BlockDriverState *bs1;
371 int64_t total_size;
372 int is_protocol = 0;
373 BlockDriver *bdrv_qcow2;
374 QEMUOptionParameter *options;
375
376 /* if snapshot, we create a temporary backing file and open it
377 instead of opening 'filename' directly */
378
379 /* if there is a backing file, use it */
380 bs1 = bdrv_new("");
381 ret = bdrv_open2(bs1, filename, 0, drv);
382 if (ret < 0) {
383 bdrv_delete(bs1);
384 return ret;
385 }
386 total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
387
388 if (bs1->drv && bs1->drv->protocol_name)
389 is_protocol = 1;
390
391 bdrv_delete(bs1);
392
393 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
394
395 /* Real path is meaningless for protocols */
396 if (is_protocol)
397 snprintf(backing_filename, sizeof(backing_filename),
398 "%s", filename);
399 else if (!realpath(filename, backing_filename))
400 return -errno;
401
402 bdrv_qcow2 = bdrv_find_format("qcow2");
403 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
404
405 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
406 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
407 if (drv) {
408 set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
409 drv->format_name);
410 }
411
412 ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
413 if (ret < 0) {
414 return ret;
415 }
416
417 filename = tmp_filename;
418 drv = bdrv_qcow2;
419 bs->is_temporary = 1;
420 }
421
422 pstrcpy(bs->filename, sizeof(bs->filename), filename);
423 if (flags & BDRV_O_FILE) {
424 drv = find_protocol(filename);
425 } else if (!drv) {
426 drv = find_hdev_driver(filename);
427 if (!drv) {
428 drv = find_image_format(filename);
429 }
430 }
431 if (!drv) {
432 ret = -ENOENT;
433 goto unlink_and_fail;
434 }
435 bs->drv = drv;
436 bs->opaque = qemu_mallocz(drv->instance_size);
437
438 /*
439 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
440 * write cache to the guest. We do need the fdatasync to flush
441 * out transactions for block allocations, and we maybe have a
442 * volatile write cache in our backing device to deal with.
443 */
444 if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
445 bs->enable_write_cache = 1;
446
447 /* Note: for compatibility, we open disk image files as RDWR, and
448 RDONLY as fallback */
449 try_rw = !bs->read_only || bs->is_temporary;
450 if (!(flags & BDRV_O_FILE))
451 open_flags = (try_rw ? BDRV_O_RDWR : 0) |
452 (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO));
453 else
454 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
455 if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv))
456 ret = -ENOTSUP;
457 else
458 ret = drv->bdrv_open(bs, filename, open_flags);
459 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
460 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
461 bs->read_only = 1;
462 }
463 if (ret < 0) {
464 qemu_free(bs->opaque);
465 bs->opaque = NULL;
466 bs->drv = NULL;
467 unlink_and_fail:
468 if (bs->is_temporary)
469 unlink(filename);
470 return ret;
471 }
472 if (drv->bdrv_getlength) {
473 bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
474 }
475 #ifndef _WIN32
476 if (bs->is_temporary) {
477 unlink(filename);
478 }
479 #endif
480 if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
481 /* if there is a backing file, use it */
482 BlockDriver *back_drv = NULL;
483 bs->backing_hd = bdrv_new("");
484 /* pass on read_only property to the backing_hd */
485 bs->backing_hd->read_only = bs->read_only;
486 path_combine(backing_filename, sizeof(backing_filename),
487 filename, bs->backing_file);
488 if (bs->backing_format[0] != '\0')
489 back_drv = bdrv_find_format(bs->backing_format);
490 ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
491 back_drv);
492 if (ret < 0) {
493 bdrv_close(bs);
494 return ret;
495 }
496 }
497
498 if (!bdrv_key_required(bs)) {
499 /* call the change callback */
500 bs->media_changed = 1;
501 if (bs->change_cb)
502 bs->change_cb(bs->change_opaque);
503 }
504 return 0;
505 }
506
507 void bdrv_close(BlockDriverState *bs)
508 {
509 if (bs->drv) {
510 if (bs->backing_hd)
511 bdrv_delete(bs->backing_hd);
512 bs->drv->bdrv_close(bs);
513 qemu_free(bs->opaque);
514 #ifdef _WIN32
515 if (bs->is_temporary) {
516 unlink(bs->filename);
517 }
518 #endif
519 bs->opaque = NULL;
520 bs->drv = NULL;
521
522 /* call the change callback */
523 bs->media_changed = 1;
524 if (bs->change_cb)
525 bs->change_cb(bs->change_opaque);
526 }
527 }
528
529 void bdrv_delete(BlockDriverState *bs)
530 {
531 BlockDriverState **pbs;
532
533 pbs = &bdrv_first;
534 while (*pbs != bs && *pbs != NULL)
535 pbs = &(*pbs)->next;
536 if (*pbs == bs)
537 *pbs = bs->next;
538
539 bdrv_close(bs);
540 qemu_free(bs);
541 }
542
543 /*
544 * Run consistency checks on an image
545 *
546 * Returns the number of errors or -errno when an internal error occurs
547 */
548 int bdrv_check(BlockDriverState *bs)
549 {
550 if (bs->drv->bdrv_check == NULL) {
551 return -ENOTSUP;
552 }
553
554 return bs->drv->bdrv_check(bs);
555 }
556
557 /* commit COW file into the raw image */
558 int bdrv_commit(BlockDriverState *bs)
559 {
560 BlockDriver *drv = bs->drv;
561 int64_t i, total_sectors;
562 int n, j;
563 unsigned char sector[512];
564
565 if (!drv)
566 return -ENOMEDIUM;
567
568 if (bs->read_only) {
569 return -EACCES;
570 }
571
572 if (!bs->backing_hd) {
573 return -ENOTSUP;
574 }
575
576 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
577 for (i = 0; i < total_sectors;) {
578 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
579 for(j = 0; j < n; j++) {
580 if (bdrv_read(bs, i, sector, 1) != 0) {
581 return -EIO;
582 }
583
584 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
585 return -EIO;
586 }
587 i++;
588 }
589 } else {
590 i += n;
591 }
592 }
593
594 if (drv->bdrv_make_empty)
595 return drv->bdrv_make_empty(bs);
596
597 /*
598 * Make sure all data we wrote to the backing device is actually
599 * stable on disk.
600 */
601 if (bs->backing_hd)
602 bdrv_flush(bs->backing_hd);
603 return 0;
604 }
605
606 /*
607 * Return values:
608 * 0 - success
609 * -EINVAL - backing format specified, but no file
610 * -ENOSPC - can't update the backing file because no space is left in the
611 * image file header
612 * -ENOTSUP - format driver doesn't support changing the backing file
613 */
614 int bdrv_change_backing_file(BlockDriverState *bs,
615 const char *backing_file, const char *backing_fmt)
616 {
617 BlockDriver *drv = bs->drv;
618
619 if (drv->bdrv_change_backing_file != NULL) {
620 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
621 } else {
622 return -ENOTSUP;
623 }
624 }
625
626 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
627 size_t size)
628 {
629 int64_t len;
630
631 if (!bdrv_is_inserted(bs))
632 return -ENOMEDIUM;
633
634 if (bs->growable)
635 return 0;
636
637 len = bdrv_getlength(bs);
638
639 if (offset < 0)
640 return -EIO;
641
642 if ((offset > len) || (len - offset < size))
643 return -EIO;
644
645 return 0;
646 }
647
648 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
649 int nb_sectors)
650 {
651 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
652 }
653
654 /* return < 0 if error. See bdrv_write() for the return codes */
655 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
656 uint8_t *buf, int nb_sectors)
657 {
658 BlockDriver *drv = bs->drv;
659
660 if (!drv)
661 return -ENOMEDIUM;
662 if (bdrv_check_request(bs, sector_num, nb_sectors))
663 return -EIO;
664
665 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
666 }
667
668 static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
669 int nb_sectors, int dirty)
670 {
671 int64_t start, end;
672 unsigned long val, idx, bit;
673
674 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
675 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
676
677 for (; start <= end; start++) {
678 idx = start / (sizeof(unsigned long) * 8);
679 bit = start % (sizeof(unsigned long) * 8);
680 val = bs->dirty_bitmap[idx];
681 if (dirty) {
682 val |= 1 << bit;
683 } else {
684 val &= ~(1 << bit);
685 }
686 bs->dirty_bitmap[idx] = val;
687 }
688 }
689
690 /* Return < 0 if error. Important errors are:
691 -EIO generic I/O error (may happen for all errors)
692 -ENOMEDIUM No media inserted.
693 -EINVAL Invalid sector number or nb_sectors
694 -EACCES Trying to write a read-only device
695 */
696 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
697 const uint8_t *buf, int nb_sectors)
698 {
699 BlockDriver *drv = bs->drv;
700 if (!bs->drv)
701 return -ENOMEDIUM;
702 if (bs->read_only)
703 return -EACCES;
704 if (bdrv_check_request(bs, sector_num, nb_sectors))
705 return -EIO;
706
707 if (bs->dirty_bitmap) {
708 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
709 }
710
711 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
712 }
713
714 int bdrv_pread(BlockDriverState *bs, int64_t offset,
715 void *buf, int count1)
716 {
717 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
718 int len, nb_sectors, count;
719 int64_t sector_num;
720
721 count = count1;
722 /* first read to align to sector start */
723 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
724 if (len > count)
725 len = count;
726 sector_num = offset >> BDRV_SECTOR_BITS;
727 if (len > 0) {
728 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
729 return -EIO;
730 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
731 count -= len;
732 if (count == 0)
733 return count1;
734 sector_num++;
735 buf += len;
736 }
737
738 /* read the sectors "in place" */
739 nb_sectors = count >> BDRV_SECTOR_BITS;
740 if (nb_sectors > 0) {
741 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
742 return -EIO;
743 sector_num += nb_sectors;
744 len = nb_sectors << BDRV_SECTOR_BITS;
745 buf += len;
746 count -= len;
747 }
748
749 /* add data from the last sector */
750 if (count > 0) {
751 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
752 return -EIO;
753 memcpy(buf, tmp_buf, count);
754 }
755 return count1;
756 }
757
758 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
759 const void *buf, int count1)
760 {
761 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
762 int len, nb_sectors, count;
763 int64_t sector_num;
764
765 count = count1;
766 /* first write to align to sector start */
767 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
768 if (len > count)
769 len = count;
770 sector_num = offset >> BDRV_SECTOR_BITS;
771 if (len > 0) {
772 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
773 return -EIO;
774 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
775 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
776 return -EIO;
777 count -= len;
778 if (count == 0)
779 return count1;
780 sector_num++;
781 buf += len;
782 }
783
784 /* write the sectors "in place" */
785 nb_sectors = count >> BDRV_SECTOR_BITS;
786 if (nb_sectors > 0) {
787 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
788 return -EIO;
789 sector_num += nb_sectors;
790 len = nb_sectors << BDRV_SECTOR_BITS;
791 buf += len;
792 count -= len;
793 }
794
795 /* add data from the last sector */
796 if (count > 0) {
797 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
798 return -EIO;
799 memcpy(tmp_buf, buf, count);
800 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
801 return -EIO;
802 }
803 return count1;
804 }
805
806 /**
807 * Truncate file to 'offset' bytes (needed only for file protocols)
808 */
809 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
810 {
811 BlockDriver *drv = bs->drv;
812 if (!drv)
813 return -ENOMEDIUM;
814 if (!drv->bdrv_truncate)
815 return -ENOTSUP;
816 if (bs->read_only)
817 return -EACCES;
818 return drv->bdrv_truncate(bs, offset);
819 }
820
821 /**
822 * Length of a file in bytes. Return < 0 if error or unknown.
823 */
824 int64_t bdrv_getlength(BlockDriverState *bs)
825 {
826 BlockDriver *drv = bs->drv;
827 if (!drv)
828 return -ENOMEDIUM;
829 if (!drv->bdrv_getlength) {
830 /* legacy mode */
831 return bs->total_sectors * BDRV_SECTOR_SIZE;
832 }
833 return drv->bdrv_getlength(bs);
834 }
835
836 /* return 0 as number of sectors if no device present or error */
837 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
838 {
839 int64_t length;
840 length = bdrv_getlength(bs);
841 if (length < 0)
842 length = 0;
843 else
844 length = length >> BDRV_SECTOR_BITS;
845 *nb_sectors_ptr = length;
846 }
847
848 struct partition {
849 uint8_t boot_ind; /* 0x80 - active */
850 uint8_t head; /* starting head */
851 uint8_t sector; /* starting sector */
852 uint8_t cyl; /* starting cylinder */
853 uint8_t sys_ind; /* What partition type */
854 uint8_t end_head; /* end head */
855 uint8_t end_sector; /* end sector */
856 uint8_t end_cyl; /* end cylinder */
857 uint32_t start_sect; /* starting sector counting from 0 */
858 uint32_t nr_sects; /* nr of sectors in partition */
859 } __attribute__((packed));
860
861 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
862 static int guess_disk_lchs(BlockDriverState *bs,
863 int *pcylinders, int *pheads, int *psectors)
864 {
865 uint8_t buf[512];
866 int ret, i, heads, sectors, cylinders;
867 struct partition *p;
868 uint32_t nr_sects;
869 uint64_t nb_sectors;
870
871 bdrv_get_geometry(bs, &nb_sectors);
872
873 ret = bdrv_read(bs, 0, buf, 1);
874 if (ret < 0)
875 return -1;
876 /* test msdos magic */
877 if (buf[510] != 0x55 || buf[511] != 0xaa)
878 return -1;
879 for(i = 0; i < 4; i++) {
880 p = ((struct partition *)(buf + 0x1be)) + i;
881 nr_sects = le32_to_cpu(p->nr_sects);
882 if (nr_sects && p->end_head) {
883 /* We make the assumption that the partition terminates on
884 a cylinder boundary */
885 heads = p->end_head + 1;
886 sectors = p->end_sector & 63;
887 if (sectors == 0)
888 continue;
889 cylinders = nb_sectors / (heads * sectors);
890 if (cylinders < 1 || cylinders > 16383)
891 continue;
892 *pheads = heads;
893 *psectors = sectors;
894 *pcylinders = cylinders;
895 #if 0
896 printf("guessed geometry: LCHS=%d %d %d\n",
897 cylinders, heads, sectors);
898 #endif
899 return 0;
900 }
901 }
902 return -1;
903 }
904
905 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
906 {
907 int translation, lba_detected = 0;
908 int cylinders, heads, secs;
909 uint64_t nb_sectors;
910
911 /* if a geometry hint is available, use it */
912 bdrv_get_geometry(bs, &nb_sectors);
913 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
914 translation = bdrv_get_translation_hint(bs);
915 if (cylinders != 0) {
916 *pcyls = cylinders;
917 *pheads = heads;
918 *psecs = secs;
919 } else {
920 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
921 if (heads > 16) {
922 /* if heads > 16, it means that a BIOS LBA
923 translation was active, so the default
924 hardware geometry is OK */
925 lba_detected = 1;
926 goto default_geometry;
927 } else {
928 *pcyls = cylinders;
929 *pheads = heads;
930 *psecs = secs;
931 /* disable any translation to be in sync with
932 the logical geometry */
933 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
934 bdrv_set_translation_hint(bs,
935 BIOS_ATA_TRANSLATION_NONE);
936 }
937 }
938 } else {
939 default_geometry:
940 /* if no geometry, use a standard physical disk geometry */
941 cylinders = nb_sectors / (16 * 63);
942
943 if (cylinders > 16383)
944 cylinders = 16383;
945 else if (cylinders < 2)
946 cylinders = 2;
947 *pcyls = cylinders;
948 *pheads = 16;
949 *psecs = 63;
950 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
951 if ((*pcyls * *pheads) <= 131072) {
952 bdrv_set_translation_hint(bs,
953 BIOS_ATA_TRANSLATION_LARGE);
954 } else {
955 bdrv_set_translation_hint(bs,
956 BIOS_ATA_TRANSLATION_LBA);
957 }
958 }
959 }
960 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
961 }
962 }
963
964 void bdrv_set_geometry_hint(BlockDriverState *bs,
965 int cyls, int heads, int secs)
966 {
967 bs->cyls = cyls;
968 bs->heads = heads;
969 bs->secs = secs;
970 }
971
972 void bdrv_set_type_hint(BlockDriverState *bs, int type)
973 {
974 bs->type = type;
975 bs->removable = ((type == BDRV_TYPE_CDROM ||
976 type == BDRV_TYPE_FLOPPY));
977 }
978
979 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
980 {
981 bs->translation = translation;
982 }
983
984 void bdrv_get_geometry_hint(BlockDriverState *bs,
985 int *pcyls, int *pheads, int *psecs)
986 {
987 *pcyls = bs->cyls;
988 *pheads = bs->heads;
989 *psecs = bs->secs;
990 }
991
992 int bdrv_get_type_hint(BlockDriverState *bs)
993 {
994 return bs->type;
995 }
996
997 int bdrv_get_translation_hint(BlockDriverState *bs)
998 {
999 return bs->translation;
1000 }
1001
1002 int bdrv_is_removable(BlockDriverState *bs)
1003 {
1004 return bs->removable;
1005 }
1006
1007 int bdrv_is_read_only(BlockDriverState *bs)
1008 {
1009 return bs->read_only;
1010 }
1011
1012 int bdrv_set_read_only(BlockDriverState *bs, int read_only)
1013 {
1014 int ret = bs->read_only;
1015 bs->read_only = read_only;
1016 return ret;
1017 }
1018
1019 int bdrv_is_sg(BlockDriverState *bs)
1020 {
1021 return bs->sg;
1022 }
1023
1024 int bdrv_enable_write_cache(BlockDriverState *bs)
1025 {
1026 return bs->enable_write_cache;
1027 }
1028
1029 /* XXX: no longer used */
1030 void bdrv_set_change_cb(BlockDriverState *bs,
1031 void (*change_cb)(void *opaque), void *opaque)
1032 {
1033 bs->change_cb = change_cb;
1034 bs->change_opaque = opaque;
1035 }
1036
1037 int bdrv_is_encrypted(BlockDriverState *bs)
1038 {
1039 if (bs->backing_hd && bs->backing_hd->encrypted)
1040 return 1;
1041 return bs->encrypted;
1042 }
1043
1044 int bdrv_key_required(BlockDriverState *bs)
1045 {
1046 BlockDriverState *backing_hd = bs->backing_hd;
1047
1048 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1049 return 1;
1050 return (bs->encrypted && !bs->valid_key);
1051 }
1052
1053 int bdrv_set_key(BlockDriverState *bs, const char *key)
1054 {
1055 int ret;
1056 if (bs->backing_hd && bs->backing_hd->encrypted) {
1057 ret = bdrv_set_key(bs->backing_hd, key);
1058 if (ret < 0)
1059 return ret;
1060 if (!bs->encrypted)
1061 return 0;
1062 }
1063 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
1064 return -1;
1065 ret = bs->drv->bdrv_set_key(bs, key);
1066 if (ret < 0) {
1067 bs->valid_key = 0;
1068 } else if (!bs->valid_key) {
1069 bs->valid_key = 1;
1070 /* call the change callback now, we skipped it on open */
1071 bs->media_changed = 1;
1072 if (bs->change_cb)
1073 bs->change_cb(bs->change_opaque);
1074 }
1075 return ret;
1076 }
1077
1078 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1079 {
1080 if (!bs->drv) {
1081 buf[0] = '\0';
1082 } else {
1083 pstrcpy(buf, buf_size, bs->drv->format_name);
1084 }
1085 }
1086
1087 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1088 void *opaque)
1089 {
1090 BlockDriver *drv;
1091
1092 for (drv = first_drv; drv != NULL; drv = drv->next) {
1093 it(opaque, drv->format_name);
1094 }
1095 }
1096
1097 BlockDriverState *bdrv_find(const char *name)
1098 {
1099 BlockDriverState *bs;
1100
1101 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1102 if (!strcmp(name, bs->device_name))
1103 return bs;
1104 }
1105 return NULL;
1106 }
1107
1108 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1109 {
1110 BlockDriverState *bs;
1111
1112 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1113 it(opaque, bs);
1114 }
1115 }
1116
1117 const char *bdrv_get_device_name(BlockDriverState *bs)
1118 {
1119 return bs->device_name;
1120 }
1121
1122 void bdrv_flush(BlockDriverState *bs)
1123 {
1124 if (bs->drv && bs->drv->bdrv_flush)
1125 bs->drv->bdrv_flush(bs);
1126 }
1127
1128 void bdrv_flush_all(void)
1129 {
1130 BlockDriverState *bs;
1131
1132 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1133 if (bs->drv && !bdrv_is_read_only(bs) &&
1134 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1135 bdrv_flush(bs);
1136 }
1137
1138 /*
1139 * Returns true iff the specified sector is present in the disk image. Drivers
1140 * not implementing the functionality are assumed to not support backing files,
1141 * hence all their sectors are reported as allocated.
1142 *
1143 * 'pnum' is set to the number of sectors (including and immediately following
1144 * the specified sector) that are known to be in the same
1145 * allocated/unallocated state.
1146 *
1147 * 'nb_sectors' is the max value 'pnum' should be set to.
1148 */
1149 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1150 int *pnum)
1151 {
1152 int64_t n;
1153 if (!bs->drv->bdrv_is_allocated) {
1154 if (sector_num >= bs->total_sectors) {
1155 *pnum = 0;
1156 return 0;
1157 }
1158 n = bs->total_sectors - sector_num;
1159 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1160 return 1;
1161 }
1162 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1163 }
1164
1165 static void bdrv_print_dict(QObject *obj, void *opaque)
1166 {
1167 QDict *bs_dict;
1168 Monitor *mon = opaque;
1169
1170 bs_dict = qobject_to_qdict(obj);
1171
1172 monitor_printf(mon, "%s: type=%s removable=%d",
1173 qdict_get_str(bs_dict, "device"),
1174 qdict_get_str(bs_dict, "type"),
1175 qdict_get_bool(bs_dict, "removable"));
1176
1177 if (qdict_get_bool(bs_dict, "removable")) {
1178 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1179 }
1180
1181 if (qdict_haskey(bs_dict, "inserted")) {
1182 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1183
1184 monitor_printf(mon, " file=");
1185 monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1186 if (qdict_haskey(qdict, "backing_file")) {
1187 monitor_printf(mon, " backing_file=");
1188 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1189 }
1190 monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1191 qdict_get_bool(qdict, "ro"),
1192 qdict_get_str(qdict, "drv"),
1193 qdict_get_bool(qdict, "encrypted"));
1194 } else {
1195 monitor_printf(mon, " [not inserted]");
1196 }
1197
1198 monitor_printf(mon, "\n");
1199 }
1200
1201 void bdrv_info_print(Monitor *mon, const QObject *data)
1202 {
1203 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1204 }
1205
1206 /**
1207 * bdrv_info(): Block devices information
1208 *
1209 * Each block device information is stored in a QDict and the
1210 * returned QObject is a QList of all devices.
1211 *
1212 * The QDict contains the following:
1213 *
1214 * - "device": device name
1215 * - "type": device type
1216 * - "removable": true if the device is removable, false otherwise
1217 * - "locked": true if the device is locked, false otherwise
1218 * - "inserted": only present if the device is inserted, it is a QDict
1219 * containing the following:
1220 * - "file": device file name
1221 * - "ro": true if read-only, false otherwise
1222 * - "drv": driver format name
1223 * - "backing_file": backing file name if one is used
1224 * - "encrypted": true if encrypted, false otherwise
1225 *
1226 * Example:
1227 *
1228 * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
1229 * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
1230 * { "device": "floppy0", "type": "floppy", "removable": true,
1231 * "locked": false } ]
1232 */
1233 void bdrv_info(Monitor *mon, QObject **ret_data)
1234 {
1235 QList *bs_list;
1236 BlockDriverState *bs;
1237
1238 bs_list = qlist_new();
1239
1240 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1241 QObject *bs_obj;
1242 const char *type = "unknown";
1243
1244 switch(bs->type) {
1245 case BDRV_TYPE_HD:
1246 type = "hd";
1247 break;
1248 case BDRV_TYPE_CDROM:
1249 type = "cdrom";
1250 break;
1251 case BDRV_TYPE_FLOPPY:
1252 type = "floppy";
1253 break;
1254 }
1255
1256 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1257 "'removable': %i, 'locked': %i }",
1258 bs->device_name, type, bs->removable,
1259 bs->locked);
1260 assert(bs_obj != NULL);
1261
1262 if (bs->drv) {
1263 QObject *obj;
1264 QDict *bs_dict = qobject_to_qdict(bs_obj);
1265
1266 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1267 "'encrypted': %i }",
1268 bs->filename, bs->read_only,
1269 bs->drv->format_name,
1270 bdrv_is_encrypted(bs));
1271 assert(obj != NULL);
1272 if (bs->backing_file[0] != '\0') {
1273 QDict *qdict = qobject_to_qdict(obj);
1274 qdict_put(qdict, "backing_file",
1275 qstring_from_str(bs->backing_file));
1276 }
1277
1278 qdict_put_obj(bs_dict, "inserted", obj);
1279 }
1280 qlist_append_obj(bs_list, bs_obj);
1281 }
1282
1283 *ret_data = QOBJECT(bs_list);
1284 }
1285
1286 static void bdrv_stats_iter(QObject *data, void *opaque)
1287 {
1288 QDict *qdict;
1289 Monitor *mon = opaque;
1290
1291 qdict = qobject_to_qdict(data);
1292 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1293
1294 qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1295 monitor_printf(mon, " rd_bytes=%" PRId64
1296 " wr_bytes=%" PRId64
1297 " rd_operations=%" PRId64
1298 " wr_operations=%" PRId64
1299 "\n",
1300 qdict_get_int(qdict, "rd_bytes"),
1301 qdict_get_int(qdict, "wr_bytes"),
1302 qdict_get_int(qdict, "rd_operations"),
1303 qdict_get_int(qdict, "wr_operations"));
1304 }
1305
1306 void bdrv_stats_print(Monitor *mon, const QObject *data)
1307 {
1308 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1309 }
1310
1311 /**
1312 * bdrv_info_stats(): show block device statistics
1313 *
1314 * Each device statistic information is stored in a QDict and
1315 * the returned QObject is a QList of all devices.
1316 *
1317 * The QDict contains the following:
1318 *
1319 * - "device": device name
1320 * - "stats": A QDict with the statistics information, it contains:
1321 * - "rd_bytes": bytes read
1322 * - "wr_bytes": bytes written
1323 * - "rd_operations": read operations
1324 * - "wr_operations": write operations
1325 *
1326 * Example:
1327 *
1328 * [ { "device": "ide0-hd0",
1329 * "stats": { "rd_bytes": 512,
1330 * "wr_bytes": 0,
1331 * "rd_operations": 1,
1332 * "wr_operations": 0 } },
1333 * { "device": "ide1-cd0",
1334 * "stats": { "rd_bytes": 0,
1335 * "wr_bytes": 0,
1336 * "rd_operations": 0,
1337 * "wr_operations": 0 } } ]
1338 */
1339 void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1340 {
1341 QObject *obj;
1342 QList *devices;
1343 BlockDriverState *bs;
1344
1345 devices = qlist_new();
1346
1347 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1348 obj = qobject_from_jsonf("{ 'device': %s, 'stats': {"
1349 "'rd_bytes': %" PRId64 ","
1350 "'wr_bytes': %" PRId64 ","
1351 "'rd_operations': %" PRId64 ","
1352 "'wr_operations': %" PRId64
1353 "} }",
1354 bs->device_name,
1355 bs->rd_bytes, bs->wr_bytes,
1356 bs->rd_ops, bs->wr_ops);
1357 assert(obj != NULL);
1358 qlist_append_obj(devices, obj);
1359 }
1360
1361 *ret_data = QOBJECT(devices);
1362 }
1363
1364 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1365 {
1366 if (bs->backing_hd && bs->backing_hd->encrypted)
1367 return bs->backing_file;
1368 else if (bs->encrypted)
1369 return bs->filename;
1370 else
1371 return NULL;
1372 }
1373
1374 void bdrv_get_backing_filename(BlockDriverState *bs,
1375 char *filename, int filename_size)
1376 {
1377 if (!bs->backing_file) {
1378 pstrcpy(filename, filename_size, "");
1379 } else {
1380 pstrcpy(filename, filename_size, bs->backing_file);
1381 }
1382 }
1383
1384 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1385 const uint8_t *buf, int nb_sectors)
1386 {
1387 BlockDriver *drv = bs->drv;
1388 if (!drv)
1389 return -ENOMEDIUM;
1390 if (!drv->bdrv_write_compressed)
1391 return -ENOTSUP;
1392 if (bdrv_check_request(bs, sector_num, nb_sectors))
1393 return -EIO;
1394
1395 if (bs->dirty_bitmap) {
1396 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1397 }
1398
1399 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1400 }
1401
1402 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1403 {
1404 BlockDriver *drv = bs->drv;
1405 if (!drv)
1406 return -ENOMEDIUM;
1407 if (!drv->bdrv_get_info)
1408 return -ENOTSUP;
1409 memset(bdi, 0, sizeof(*bdi));
1410 return drv->bdrv_get_info(bs, bdi);
1411 }
1412
1413 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1414 int64_t pos, int size)
1415 {
1416 BlockDriver *drv = bs->drv;
1417 if (!drv)
1418 return -ENOMEDIUM;
1419 if (!drv->bdrv_save_vmstate)
1420 return -ENOTSUP;
1421 return drv->bdrv_save_vmstate(bs, buf, pos, size);
1422 }
1423
1424 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1425 int64_t pos, int size)
1426 {
1427 BlockDriver *drv = bs->drv;
1428 if (!drv)
1429 return -ENOMEDIUM;
1430 if (!drv->bdrv_load_vmstate)
1431 return -ENOTSUP;
1432 return drv->bdrv_load_vmstate(bs, buf, pos, size);
1433 }
1434
1435 /**************************************************************/
1436 /* handling of snapshots */
1437
1438 int bdrv_snapshot_create(BlockDriverState *bs,
1439 QEMUSnapshotInfo *sn_info)
1440 {
1441 BlockDriver *drv = bs->drv;
1442 if (!drv)
1443 return -ENOMEDIUM;
1444 if (!drv->bdrv_snapshot_create)
1445 return -ENOTSUP;
1446 return drv->bdrv_snapshot_create(bs, sn_info);
1447 }
1448
1449 int bdrv_snapshot_goto(BlockDriverState *bs,
1450 const char *snapshot_id)
1451 {
1452 BlockDriver *drv = bs->drv;
1453 if (!drv)
1454 return -ENOMEDIUM;
1455 if (!drv->bdrv_snapshot_goto)
1456 return -ENOTSUP;
1457 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1458 }
1459
1460 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1461 {
1462 BlockDriver *drv = bs->drv;
1463 if (!drv)
1464 return -ENOMEDIUM;
1465 if (!drv->bdrv_snapshot_delete)
1466 return -ENOTSUP;
1467 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1468 }
1469
1470 int bdrv_snapshot_list(BlockDriverState *bs,
1471 QEMUSnapshotInfo **psn_info)
1472 {
1473 BlockDriver *drv = bs->drv;
1474 if (!drv)
1475 return -ENOMEDIUM;
1476 if (!drv->bdrv_snapshot_list)
1477 return -ENOTSUP;
1478 return drv->bdrv_snapshot_list(bs, psn_info);
1479 }
1480
1481 #define NB_SUFFIXES 4
1482
1483 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1484 {
1485 static const char suffixes[NB_SUFFIXES] = "KMGT";
1486 int64_t base;
1487 int i;
1488
1489 if (size <= 999) {
1490 snprintf(buf, buf_size, "%" PRId64, size);
1491 } else {
1492 base = 1024;
1493 for(i = 0; i < NB_SUFFIXES; i++) {
1494 if (size < (10 * base)) {
1495 snprintf(buf, buf_size, "%0.1f%c",
1496 (double)size / base,
1497 suffixes[i]);
1498 break;
1499 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1500 snprintf(buf, buf_size, "%" PRId64 "%c",
1501 ((size + (base >> 1)) / base),
1502 suffixes[i]);
1503 break;
1504 }
1505 base = base * 1024;
1506 }
1507 }
1508 return buf;
1509 }
1510
1511 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1512 {
1513 char buf1[128], date_buf[128], clock_buf[128];
1514 #ifdef _WIN32
1515 struct tm *ptm;
1516 #else
1517 struct tm tm;
1518 #endif
1519 time_t ti;
1520 int64_t secs;
1521
1522 if (!sn) {
1523 snprintf(buf, buf_size,
1524 "%-10s%-20s%7s%20s%15s",
1525 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1526 } else {
1527 ti = sn->date_sec;
1528 #ifdef _WIN32
1529 ptm = localtime(&ti);
1530 strftime(date_buf, sizeof(date_buf),
1531 "%Y-%m-%d %H:%M:%S", ptm);
1532 #else
1533 localtime_r(&ti, &tm);
1534 strftime(date_buf, sizeof(date_buf),
1535 "%Y-%m-%d %H:%M:%S", &tm);
1536 #endif
1537 secs = sn->vm_clock_nsec / 1000000000;
1538 snprintf(clock_buf, sizeof(clock_buf),
1539 "%02d:%02d:%02d.%03d",
1540 (int)(secs / 3600),
1541 (int)((secs / 60) % 60),
1542 (int)(secs % 60),
1543 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1544 snprintf(buf, buf_size,
1545 "%-10s%-20s%7s%20s%15s",
1546 sn->id_str, sn->name,
1547 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1548 date_buf,
1549 clock_buf);
1550 }
1551 return buf;
1552 }
1553
1554
1555 /**************************************************************/
1556 /* async I/Os */
1557
1558 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1559 QEMUIOVector *qiov, int nb_sectors,
1560 BlockDriverCompletionFunc *cb, void *opaque)
1561 {
1562 BlockDriver *drv = bs->drv;
1563 BlockDriverAIOCB *ret;
1564
1565 if (!drv)
1566 return NULL;
1567 if (bdrv_check_request(bs, sector_num, nb_sectors))
1568 return NULL;
1569
1570 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1571 cb, opaque);
1572
1573 if (ret) {
1574 /* Update stats even though technically transfer has not happened. */
1575 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1576 bs->rd_ops ++;
1577 }
1578
1579 return ret;
1580 }
1581
1582 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1583 QEMUIOVector *qiov, int nb_sectors,
1584 BlockDriverCompletionFunc *cb, void *opaque)
1585 {
1586 BlockDriver *drv = bs->drv;
1587 BlockDriverAIOCB *ret;
1588
1589 if (!drv)
1590 return NULL;
1591 if (bs->read_only)
1592 return NULL;
1593 if (bdrv_check_request(bs, sector_num, nb_sectors))
1594 return NULL;
1595
1596 if (bs->dirty_bitmap) {
1597 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1598 }
1599
1600 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1601 cb, opaque);
1602
1603 if (ret) {
1604 /* Update stats even though technically transfer has not happened. */
1605 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1606 bs->wr_ops ++;
1607 }
1608
1609 return ret;
1610 }
1611
1612
1613 typedef struct MultiwriteCB {
1614 int error;
1615 int num_requests;
1616 int num_callbacks;
1617 struct {
1618 BlockDriverCompletionFunc *cb;
1619 void *opaque;
1620 QEMUIOVector *free_qiov;
1621 void *free_buf;
1622 } callbacks[];
1623 } MultiwriteCB;
1624
1625 static void multiwrite_user_cb(MultiwriteCB *mcb)
1626 {
1627 int i;
1628
1629 for (i = 0; i < mcb->num_callbacks; i++) {
1630 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1631 qemu_free(mcb->callbacks[i].free_qiov);
1632 qemu_free(mcb->callbacks[i].free_buf);
1633 }
1634 }
1635
1636 static void multiwrite_cb(void *opaque, int ret)
1637 {
1638 MultiwriteCB *mcb = opaque;
1639
1640 if (ret < 0) {
1641 mcb->error = ret;
1642 multiwrite_user_cb(mcb);
1643 }
1644
1645 mcb->num_requests--;
1646 if (mcb->num_requests == 0) {
1647 if (mcb->error == 0) {
1648 multiwrite_user_cb(mcb);
1649 }
1650 qemu_free(mcb);
1651 }
1652 }
1653
1654 static int multiwrite_req_compare(const void *a, const void *b)
1655 {
1656 return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
1657 }
1658
1659 /*
1660 * Takes a bunch of requests and tries to merge them. Returns the number of
1661 * requests that remain after merging.
1662 */
1663 static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
1664 int num_reqs, MultiwriteCB *mcb)
1665 {
1666 int i, outidx;
1667
1668 // Sort requests by start sector
1669 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
1670
1671 // Check if adjacent requests touch the same clusters. If so, combine them,
1672 // filling up gaps with zero sectors.
1673 outidx = 0;
1674 for (i = 1; i < num_reqs; i++) {
1675 int merge = 0;
1676 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
1677
1678 // This handles the cases that are valid for all block drivers, namely
1679 // exactly sequential writes and overlapping writes.
1680 if (reqs[i].sector <= oldreq_last) {
1681 merge = 1;
1682 }
1683
1684 // The block driver may decide that it makes sense to combine requests
1685 // even if there is a gap of some sectors between them. In this case,
1686 // the gap is filled with zeros (therefore only applicable for yet
1687 // unused space in format like qcow2).
1688 if (!merge && bs->drv->bdrv_merge_requests) {
1689 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
1690 }
1691
1692 if (merge) {
1693 size_t size;
1694 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
1695 qemu_iovec_init(qiov,
1696 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
1697
1698 // Add the first request to the merged one. If the requests are
1699 // overlapping, drop the last sectors of the first request.
1700 size = (reqs[i].sector - reqs[outidx].sector) << 9;
1701 qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
1702
1703 // We might need to add some zeros between the two requests
1704 if (reqs[i].sector > oldreq_last) {
1705 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
1706 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
1707 memset(buf, 0, zero_bytes);
1708 qemu_iovec_add(qiov, buf, zero_bytes);
1709 mcb->callbacks[i].free_buf = buf;
1710 }
1711
1712 // Add the second request
1713 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
1714
1715 reqs[outidx].nb_sectors += reqs[i].nb_sectors;
1716 reqs[outidx].qiov = qiov;
1717
1718 mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
1719 } else {
1720 outidx++;
1721 reqs[outidx].sector = reqs[i].sector;
1722 reqs[outidx].nb_sectors = reqs[i].nb_sectors;
1723 reqs[outidx].qiov = reqs[i].qiov;
1724 }
1725 }
1726
1727 return outidx + 1;
1728 }
1729
1730 /*
1731 * Submit multiple AIO write requests at once.
1732 *
1733 * On success, the function returns 0 and all requests in the reqs array have
1734 * been submitted. In error case this function returns -1, and any of the
1735 * requests may or may not be submitted yet. In particular, this means that the
1736 * callback will be called for some of the requests, for others it won't. The
1737 * caller must check the error field of the BlockRequest to wait for the right
1738 * callbacks (if error != 0, no callback will be called).
1739 *
1740 * The implementation may modify the contents of the reqs array, e.g. to merge
1741 * requests. However, the fields opaque and error are left unmodified as they
1742 * are used to signal failure for a single request to the caller.
1743 */
1744 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
1745 {
1746 BlockDriverAIOCB *acb;
1747 MultiwriteCB *mcb;
1748 int i;
1749
1750 if (num_reqs == 0) {
1751 return 0;
1752 }
1753
1754 // Create MultiwriteCB structure
1755 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
1756 mcb->num_requests = 0;
1757 mcb->num_callbacks = num_reqs;
1758
1759 for (i = 0; i < num_reqs; i++) {
1760 mcb->callbacks[i].cb = reqs[i].cb;
1761 mcb->callbacks[i].opaque = reqs[i].opaque;
1762 }
1763
1764 // Check for mergable requests
1765 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
1766
1767 // Run the aio requests
1768 for (i = 0; i < num_reqs; i++) {
1769 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
1770 reqs[i].nb_sectors, multiwrite_cb, mcb);
1771
1772 if (acb == NULL) {
1773 // We can only fail the whole thing if no request has been
1774 // submitted yet. Otherwise we'll wait for the submitted AIOs to
1775 // complete and report the error in the callback.
1776 if (mcb->num_requests == 0) {
1777 reqs[i].error = EIO;
1778 goto fail;
1779 } else {
1780 mcb->error = EIO;
1781 break;
1782 }
1783 } else {
1784 mcb->num_requests++;
1785 }
1786 }
1787
1788 return 0;
1789
1790 fail:
1791 free(mcb);
1792 return -1;
1793 }
1794
1795 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
1796 BlockDriverCompletionFunc *cb, void *opaque)
1797 {
1798 BlockDriver *drv = bs->drv;
1799
1800 if (!drv)
1801 return NULL;
1802 return drv->bdrv_aio_flush(bs, cb, opaque);
1803 }
1804
1805 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1806 {
1807 acb->pool->cancel(acb);
1808 }
1809
1810
1811 /**************************************************************/
1812 /* async block device emulation */
1813
1814 typedef struct BlockDriverAIOCBSync {
1815 BlockDriverAIOCB common;
1816 QEMUBH *bh;
1817 int ret;
1818 /* vector translation state */
1819 QEMUIOVector *qiov;
1820 uint8_t *bounce;
1821 int is_write;
1822 } BlockDriverAIOCBSync;
1823
1824 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1825 {
1826 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1827 qemu_bh_delete(acb->bh);
1828 acb->bh = NULL;
1829 qemu_aio_release(acb);
1830 }
1831
1832 static AIOPool bdrv_em_aio_pool = {
1833 .aiocb_size = sizeof(BlockDriverAIOCBSync),
1834 .cancel = bdrv_aio_cancel_em,
1835 };
1836
1837 static void bdrv_aio_bh_cb(void *opaque)
1838 {
1839 BlockDriverAIOCBSync *acb = opaque;
1840
1841 if (!acb->is_write)
1842 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1843 qemu_vfree(acb->bounce);
1844 acb->common.cb(acb->common.opaque, acb->ret);
1845 qemu_bh_delete(acb->bh);
1846 acb->bh = NULL;
1847 qemu_aio_release(acb);
1848 }
1849
1850 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1851 int64_t sector_num,
1852 QEMUIOVector *qiov,
1853 int nb_sectors,
1854 BlockDriverCompletionFunc *cb,
1855 void *opaque,
1856 int is_write)
1857
1858 {
1859 BlockDriverAIOCBSync *acb;
1860
1861 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
1862 acb->is_write = is_write;
1863 acb->qiov = qiov;
1864 acb->bounce = qemu_blockalign(bs, qiov->size);
1865
1866 if (!acb->bh)
1867 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1868
1869 if (is_write) {
1870 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
1871 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
1872 } else {
1873 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
1874 }
1875
1876 qemu_bh_schedule(acb->bh);
1877
1878 return &acb->common;
1879 }
1880
1881 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
1882 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1883 BlockDriverCompletionFunc *cb, void *opaque)
1884 {
1885 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1886 }
1887
1888 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
1889 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1890 BlockDriverCompletionFunc *cb, void *opaque)
1891 {
1892 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1893 }
1894
1895 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
1896 BlockDriverCompletionFunc *cb, void *opaque)
1897 {
1898 BlockDriverAIOCBSync *acb;
1899
1900 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
1901 acb->is_write = 1; /* don't bounce in the completion hadler */
1902 acb->qiov = NULL;
1903 acb->bounce = NULL;
1904 acb->ret = 0;
1905
1906 if (!acb->bh)
1907 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1908
1909 bdrv_flush(bs);
1910 qemu_bh_schedule(acb->bh);
1911 return &acb->common;
1912 }
1913
1914 /**************************************************************/
1915 /* sync block device emulation */
1916
1917 static void bdrv_rw_em_cb(void *opaque, int ret)
1918 {
1919 *(int *)opaque = ret;
1920 }
1921
1922 #define NOT_DONE 0x7fffffff
1923
1924 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1925 uint8_t *buf, int nb_sectors)
1926 {
1927 int async_ret;
1928 BlockDriverAIOCB *acb;
1929 struct iovec iov;
1930 QEMUIOVector qiov;
1931
1932 async_context_push();
1933
1934 async_ret = NOT_DONE;
1935 iov.iov_base = (void *)buf;
1936 iov.iov_len = nb_sectors * 512;
1937 qemu_iovec_init_external(&qiov, &iov, 1);
1938 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
1939 bdrv_rw_em_cb, &async_ret);
1940 if (acb == NULL) {
1941 async_ret = -1;
1942 goto fail;
1943 }
1944
1945 while (async_ret == NOT_DONE) {
1946 qemu_aio_wait();
1947 }
1948
1949
1950 fail:
1951 async_context_pop();
1952 return async_ret;
1953 }
1954
1955 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1956 const uint8_t *buf, int nb_sectors)
1957 {
1958 int async_ret;
1959 BlockDriverAIOCB *acb;
1960 struct iovec iov;
1961 QEMUIOVector qiov;
1962
1963 async_context_push();
1964
1965 async_ret = NOT_DONE;
1966 iov.iov_base = (void *)buf;
1967 iov.iov_len = nb_sectors * 512;
1968 qemu_iovec_init_external(&qiov, &iov, 1);
1969 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
1970 bdrv_rw_em_cb, &async_ret);
1971 if (acb == NULL) {
1972 async_ret = -1;
1973 goto fail;
1974 }
1975 while (async_ret == NOT_DONE) {
1976 qemu_aio_wait();
1977 }
1978
1979 fail:
1980 async_context_pop();
1981 return async_ret;
1982 }
1983
1984 void bdrv_init(void)
1985 {
1986 module_call_init(MODULE_INIT_BLOCK);
1987 }
1988
1989 void bdrv_init_with_whitelist(void)
1990 {
1991 use_bdrv_whitelist = 1;
1992 bdrv_init();
1993 }
1994
1995 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
1996 BlockDriverCompletionFunc *cb, void *opaque)
1997 {
1998 BlockDriverAIOCB *acb;
1999
2000 if (pool->free_aiocb) {
2001 acb = pool->free_aiocb;
2002 pool->free_aiocb = acb->next;
2003 } else {
2004 acb = qemu_mallocz(pool->aiocb_size);
2005 acb->pool = pool;
2006 }
2007 acb->bs = bs;
2008 acb->cb = cb;
2009 acb->opaque = opaque;
2010 return acb;
2011 }
2012
2013 void qemu_aio_release(void *p)
2014 {
2015 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2016 AIOPool *pool = acb->pool;
2017 acb->next = pool->free_aiocb;
2018 pool->free_aiocb = acb;
2019 }
2020
2021 /**************************************************************/
2022 /* removable device support */
2023
2024 /**
2025 * Return TRUE if the media is present
2026 */
2027 int bdrv_is_inserted(BlockDriverState *bs)
2028 {
2029 BlockDriver *drv = bs->drv;
2030 int ret;
2031 if (!drv)
2032 return 0;
2033 if (!drv->bdrv_is_inserted)
2034 return 1;
2035 ret = drv->bdrv_is_inserted(bs);
2036 return ret;
2037 }
2038
2039 /**
2040 * Return TRUE if the media changed since the last call to this
2041 * function. It is currently only used for floppy disks
2042 */
2043 int bdrv_media_changed(BlockDriverState *bs)
2044 {
2045 BlockDriver *drv = bs->drv;
2046 int ret;
2047
2048 if (!drv || !drv->bdrv_media_changed)
2049 ret = -ENOTSUP;
2050 else
2051 ret = drv->bdrv_media_changed(bs);
2052 if (ret == -ENOTSUP)
2053 ret = bs->media_changed;
2054 bs->media_changed = 0;
2055 return ret;
2056 }
2057
2058 /**
2059 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2060 */
2061 int bdrv_eject(BlockDriverState *bs, int eject_flag)
2062 {
2063 BlockDriver *drv = bs->drv;
2064 int ret;
2065
2066 if (bs->locked) {
2067 return -EBUSY;
2068 }
2069
2070 if (!drv || !drv->bdrv_eject) {
2071 ret = -ENOTSUP;
2072 } else {
2073 ret = drv->bdrv_eject(bs, eject_flag);
2074 }
2075 if (ret == -ENOTSUP) {
2076 if (eject_flag)
2077 bdrv_close(bs);
2078 ret = 0;
2079 }
2080
2081 return ret;
2082 }
2083
2084 int bdrv_is_locked(BlockDriverState *bs)
2085 {
2086 return bs->locked;
2087 }
2088
2089 /**
2090 * Lock or unlock the media (if it is locked, the user won't be able
2091 * to eject it manually).
2092 */
2093 void bdrv_set_locked(BlockDriverState *bs, int locked)
2094 {
2095 BlockDriver *drv = bs->drv;
2096
2097 bs->locked = locked;
2098 if (drv && drv->bdrv_set_locked) {
2099 drv->bdrv_set_locked(bs, locked);
2100 }
2101 }
2102
2103 /* needed for generic scsi interface */
2104
2105 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2106 {
2107 BlockDriver *drv = bs->drv;
2108
2109 if (drv && drv->bdrv_ioctl)
2110 return drv->bdrv_ioctl(bs, req, buf);
2111 return -ENOTSUP;
2112 }
2113
2114 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2115 unsigned long int req, void *buf,
2116 BlockDriverCompletionFunc *cb, void *opaque)
2117 {
2118 BlockDriver *drv = bs->drv;
2119
2120 if (drv && drv->bdrv_aio_ioctl)
2121 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2122 return NULL;
2123 }
2124
2125
2126
2127 void *qemu_blockalign(BlockDriverState *bs, size_t size)
2128 {
2129 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2130 }
2131
2132 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2133 {
2134 int64_t bitmap_size;
2135
2136 if (enable) {
2137 if (!bs->dirty_bitmap) {
2138 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2139 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2140 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2141
2142 bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2143 }
2144 } else {
2145 if (bs->dirty_bitmap) {
2146 qemu_free(bs->dirty_bitmap);
2147 bs->dirty_bitmap = NULL;
2148 }
2149 }
2150 }
2151
2152 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2153 {
2154 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2155
2156 if (bs->dirty_bitmap &&
2157 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2158 return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2159 (1 << (chunk % (sizeof(unsigned long) * 8)));
2160 } else {
2161 return 0;
2162 }
2163 }
2164
2165 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2166 int nr_sectors)
2167 {
2168 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2169 }
Qemu with PowerPC KVM improvements