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do not use qemu_icount_delta in the !use_icount case
[qemu.git] / block.c
blobf7d91a2de1557310a4a545210e54e1adf255fbe4
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 "trace.h"
27 #include "monitor.h"
28 #include "block_int.h"
29 #include "module.h"
30 #include "qemu-objects.h"
31
32 #ifdef CONFIG_BSD
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <sys/ioctl.h>
36 #include <sys/queue.h>
37 #ifndef __DragonFly__
38 #include <sys/disk.h>
39 #endif
40 #endif
41
42 #ifdef _WIN32
43 #include <windows.h>
44 #endif
45
46 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
47 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
48 BlockDriverCompletionFunc *cb, void *opaque);
49 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
50 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
51 BlockDriverCompletionFunc *cb, void *opaque);
52 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
53 BlockDriverCompletionFunc *cb, void *opaque);
54 static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
55 BlockDriverCompletionFunc *cb, void *opaque);
56 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
57 uint8_t *buf, int nb_sectors);
58 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
59 const uint8_t *buf, int nb_sectors);
60
61 static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
62 QTAILQ_HEAD_INITIALIZER(bdrv_states);
63
64 static QLIST_HEAD(, BlockDriver) bdrv_drivers =
65 QLIST_HEAD_INITIALIZER(bdrv_drivers);
66
67 /* The device to use for VM snapshots */
68 static BlockDriverState *bs_snapshots;
69
70 /* If non-zero, use only whitelisted block drivers */
71 static int use_bdrv_whitelist;
72
73 #ifdef _WIN32
74 static int is_windows_drive_prefix(const char *filename)
75 {
76 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
77 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
78 filename[1] == ':');
79 }
80
81 int is_windows_drive(const char *filename)
82 {
83 if (is_windows_drive_prefix(filename) &&
84 filename[2] == '\0')
85 return 1;
86 if (strstart(filename, "\\\\.\\", NULL) ||
87 strstart(filename, "//./", NULL))
88 return 1;
89 return 0;
90 }
91 #endif
92
93 /* check if the path starts with "<protocol>:" */
94 static int path_has_protocol(const char *path)
95 {
96 #ifdef _WIN32
97 if (is_windows_drive(path) ||
98 is_windows_drive_prefix(path)) {
99 return 0;
100 }
101 #endif
102
103 return strchr(path, ':') != NULL;
104 }
105
106 int path_is_absolute(const char *path)
107 {
108 const char *p;
109 #ifdef _WIN32
110 /* specific case for names like: "\\.\d:" */
111 if (*path == '/' || *path == '\\')
112 return 1;
113 #endif
114 p = strchr(path, ':');
115 if (p)
116 p++;
117 else
118 p = path;
119 #ifdef _WIN32
120 return (*p == '/' || *p == '\\');
121 #else
122 return (*p == '/');
123 #endif
124 }
125
126 /* if filename is absolute, just copy it to dest. Otherwise, build a
127 path to it by considering it is relative to base_path. URL are
128 supported. */
129 void path_combine(char *dest, int dest_size,
130 const char *base_path,
131 const char *filename)
132 {
133 const char *p, *p1;
134 int len;
135
136 if (dest_size <= 0)
137 return;
138 if (path_is_absolute(filename)) {
139 pstrcpy(dest, dest_size, filename);
140 } else {
141 p = strchr(base_path, ':');
142 if (p)
143 p++;
144 else
145 p = base_path;
146 p1 = strrchr(base_path, '/');
147 #ifdef _WIN32
148 {
149 const char *p2;
150 p2 = strrchr(base_path, '\\');
151 if (!p1 || p2 > p1)
152 p1 = p2;
153 }
154 #endif
155 if (p1)
156 p1++;
157 else
158 p1 = base_path;
159 if (p1 > p)
160 p = p1;
161 len = p - base_path;
162 if (len > dest_size - 1)
163 len = dest_size - 1;
164 memcpy(dest, base_path, len);
165 dest[len] = '\0';
166 pstrcat(dest, dest_size, filename);
167 }
168 }
169
170 void bdrv_register(BlockDriver *bdrv)
171 {
172 if (!bdrv->bdrv_aio_readv) {
173 /* add AIO emulation layer */
174 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
175 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
176 } else if (!bdrv->bdrv_read) {
177 /* add synchronous IO emulation layer */
178 bdrv->bdrv_read = bdrv_read_em;
179 bdrv->bdrv_write = bdrv_write_em;
180 }
181
182 if (!bdrv->bdrv_aio_flush)
183 bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
184
185 QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
186 }
187
188 /* create a new block device (by default it is empty) */
189 BlockDriverState *bdrv_new(const char *device_name)
190 {
191 BlockDriverState *bs;
192
193 bs = qemu_mallocz(sizeof(BlockDriverState));
194 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
195 if (device_name[0] != '\0') {
196 QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
197 }
198 return bs;
199 }
200
201 BlockDriver *bdrv_find_format(const char *format_name)
202 {
203 BlockDriver *drv1;
204 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
205 if (!strcmp(drv1->format_name, format_name)) {
206 return drv1;
207 }
208 }
209 return NULL;
210 }
211
212 static int bdrv_is_whitelisted(BlockDriver *drv)
213 {
214 static const char *whitelist[] = {
215 CONFIG_BDRV_WHITELIST
216 };
217 const char **p;
218
219 if (!whitelist[0])
220 return 1; /* no whitelist, anything goes */
221
222 for (p = whitelist; *p; p++) {
223 if (!strcmp(drv->format_name, *p)) {
224 return 1;
225 }
226 }
227 return 0;
228 }
229
230 BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
231 {
232 BlockDriver *drv = bdrv_find_format(format_name);
233 return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
234 }
235
236 int bdrv_create(BlockDriver *drv, const char* filename,
237 QEMUOptionParameter *options)
238 {
239 if (!drv->bdrv_create)
240 return -ENOTSUP;
241
242 return drv->bdrv_create(filename, options);
243 }
244
245 int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
246 {
247 BlockDriver *drv;
248
249 drv = bdrv_find_protocol(filename);
250 if (drv == NULL) {
251 return -ENOENT;
252 }
253
254 return bdrv_create(drv, filename, options);
255 }
256
257 #ifdef _WIN32
258 void get_tmp_filename(char *filename, int size)
259 {
260 char temp_dir[MAX_PATH];
261
262 GetTempPath(MAX_PATH, temp_dir);
263 GetTempFileName(temp_dir, "qem", 0, filename);
264 }
265 #else
266 void get_tmp_filename(char *filename, int size)
267 {
268 int fd;
269 const char *tmpdir;
270 /* XXX: race condition possible */
271 tmpdir = getenv("TMPDIR");
272 if (!tmpdir)
273 tmpdir = "/tmp";
274 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
275 fd = mkstemp(filename);
276 close(fd);
277 }
278 #endif
279
280 /*
281 * Detect host devices. By convention, /dev/cdrom[N] is always
282 * recognized as a host CDROM.
283 */
284 static BlockDriver *find_hdev_driver(const char *filename)
285 {
286 int score_max = 0, score;
287 BlockDriver *drv = NULL, *d;
288
289 QLIST_FOREACH(d, &bdrv_drivers, list) {
290 if (d->bdrv_probe_device) {
291 score = d->bdrv_probe_device(filename);
292 if (score > score_max) {
293 score_max = score;
294 drv = d;
295 }
296 }
297 }
298
299 return drv;
300 }
301
302 BlockDriver *bdrv_find_protocol(const char *filename)
303 {
304 BlockDriver *drv1;
305 char protocol[128];
306 int len;
307 const char *p;
308
309 /* TODO Drivers without bdrv_file_open must be specified explicitly */
310
311 /*
312 * XXX(hch): we really should not let host device detection
313 * override an explicit protocol specification, but moving this
314 * later breaks access to device names with colons in them.
315 * Thanks to the brain-dead persistent naming schemes on udev-
316 * based Linux systems those actually are quite common.
317 */
318 drv1 = find_hdev_driver(filename);
319 if (drv1) {
320 return drv1;
321 }
322
323 if (!path_has_protocol(filename)) {
324 return bdrv_find_format("file");
325 }
326 p = strchr(filename, ':');
327 assert(p != NULL);
328 len = p - filename;
329 if (len > sizeof(protocol) - 1)
330 len = sizeof(protocol) - 1;
331 memcpy(protocol, filename, len);
332 protocol[len] = '\0';
333 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
334 if (drv1->protocol_name &&
335 !strcmp(drv1->protocol_name, protocol)) {
336 return drv1;
337 }
338 }
339 return NULL;
340 }
341
342 static int find_image_format(const char *filename, BlockDriver **pdrv)
343 {
344 int ret, score, score_max;
345 BlockDriver *drv1, *drv;
346 uint8_t buf[2048];
347 BlockDriverState *bs;
348
349 ret = bdrv_file_open(&bs, filename, 0);
350 if (ret < 0) {
351 *pdrv = NULL;
352 return ret;
353 }
354
355 /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
356 if (bs->sg || !bdrv_is_inserted(bs)) {
357 bdrv_delete(bs);
358 drv = bdrv_find_format("raw");
359 if (!drv) {
360 ret = -ENOENT;
361 }
362 *pdrv = drv;
363 return ret;
364 }
365
366 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
367 bdrv_delete(bs);
368 if (ret < 0) {
369 *pdrv = NULL;
370 return ret;
371 }
372
373 score_max = 0;
374 drv = NULL;
375 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
376 if (drv1->bdrv_probe) {
377 score = drv1->bdrv_probe(buf, ret, filename);
378 if (score > score_max) {
379 score_max = score;
380 drv = drv1;
381 }
382 }
383 }
384 if (!drv) {
385 ret = -ENOENT;
386 }
387 *pdrv = drv;
388 return ret;
389 }
390
391 /**
392 * Set the current 'total_sectors' value
393 */
394 static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
395 {
396 BlockDriver *drv = bs->drv;
397
398 /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
399 if (bs->sg)
400 return 0;
401
402 /* query actual device if possible, otherwise just trust the hint */
403 if (drv->bdrv_getlength) {
404 int64_t length = drv->bdrv_getlength(bs);
405 if (length < 0) {
406 return length;
407 }
408 hint = length >> BDRV_SECTOR_BITS;
409 }
410
411 bs->total_sectors = hint;
412 return 0;
413 }
414
415 /*
416 * Common part for opening disk images and files
417 */
418 static int bdrv_open_common(BlockDriverState *bs, const char *filename,
419 int flags, BlockDriver *drv)
420 {
421 int ret, open_flags;
422
423 assert(drv != NULL);
424
425 bs->file = NULL;
426 bs->total_sectors = 0;
427 bs->encrypted = 0;
428 bs->valid_key = 0;
429 bs->open_flags = flags;
430 /* buffer_alignment defaulted to 512, drivers can change this value */
431 bs->buffer_alignment = 512;
432
433 pstrcpy(bs->filename, sizeof(bs->filename), filename);
434
435 if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
436 return -ENOTSUP;
437 }
438
439 bs->drv = drv;
440 bs->opaque = qemu_mallocz(drv->instance_size);
441
442 /*
443 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
444 * write cache to the guest. We do need the fdatasync to flush
445 * out transactions for block allocations, and we maybe have a
446 * volatile write cache in our backing device to deal with.
447 */
448 if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
449 bs->enable_write_cache = 1;
450
451 /*
452 * Clear flags that are internal to the block layer before opening the
453 * image.
454 */
455 open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
456
457 /*
458 * Snapshots should be writeable.
459 */
460 if (bs->is_temporary) {
461 open_flags |= BDRV_O_RDWR;
462 }
463
464 /* Open the image, either directly or using a protocol */
465 if (drv->bdrv_file_open) {
466 ret = drv->bdrv_file_open(bs, filename, open_flags);
467 } else {
468 ret = bdrv_file_open(&bs->file, filename, open_flags);
469 if (ret >= 0) {
470 ret = drv->bdrv_open(bs, open_flags);
471 }
472 }
473
474 if (ret < 0) {
475 goto free_and_fail;
476 }
477
478 bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
479
480 ret = refresh_total_sectors(bs, bs->total_sectors);
481 if (ret < 0) {
482 goto free_and_fail;
483 }
484
485 #ifndef _WIN32
486 if (bs->is_temporary) {
487 unlink(filename);
488 }
489 #endif
490 return 0;
491
492 free_and_fail:
493 if (bs->file) {
494 bdrv_delete(bs->file);
495 bs->file = NULL;
496 }
497 qemu_free(bs->opaque);
498 bs->opaque = NULL;
499 bs->drv = NULL;
500 return ret;
501 }
502
503 /*
504 * Opens a file using a protocol (file, host_device, nbd, ...)
505 */
506 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
507 {
508 BlockDriverState *bs;
509 BlockDriver *drv;
510 int ret;
511
512 drv = bdrv_find_protocol(filename);
513 if (!drv) {
514 return -ENOENT;
515 }
516
517 bs = bdrv_new("");
518 ret = bdrv_open_common(bs, filename, flags, drv);
519 if (ret < 0) {
520 bdrv_delete(bs);
521 return ret;
522 }
523 bs->growable = 1;
524 *pbs = bs;
525 return 0;
526 }
527
528 /*
529 * Opens a disk image (raw, qcow2, vmdk, ...)
530 */
531 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
532 BlockDriver *drv)
533 {
534 int ret;
535
536 if (flags & BDRV_O_SNAPSHOT) {
537 BlockDriverState *bs1;
538 int64_t total_size;
539 int is_protocol = 0;
540 BlockDriver *bdrv_qcow2;
541 QEMUOptionParameter *options;
542 char tmp_filename[PATH_MAX];
543 char backing_filename[PATH_MAX];
544
545 /* if snapshot, we create a temporary backing file and open it
546 instead of opening 'filename' directly */
547
548 /* if there is a backing file, use it */
549 bs1 = bdrv_new("");
550 ret = bdrv_open(bs1, filename, 0, drv);
551 if (ret < 0) {
552 bdrv_delete(bs1);
553 return ret;
554 }
555 total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
556
557 if (bs1->drv && bs1->drv->protocol_name)
558 is_protocol = 1;
559
560 bdrv_delete(bs1);
561
562 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
563
564 /* Real path is meaningless for protocols */
565 if (is_protocol)
566 snprintf(backing_filename, sizeof(backing_filename),
567 "%s", filename);
568 else if (!realpath(filename, backing_filename))
569 return -errno;
570
571 bdrv_qcow2 = bdrv_find_format("qcow2");
572 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
573
574 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
575 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
576 if (drv) {
577 set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
578 drv->format_name);
579 }
580
581 ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
582 free_option_parameters(options);
583 if (ret < 0) {
584 return ret;
585 }
586
587 filename = tmp_filename;
588 drv = bdrv_qcow2;
589 bs->is_temporary = 1;
590 }
591
592 /* Find the right image format driver */
593 if (!drv) {
594 ret = find_image_format(filename, &drv);
595 }
596
597 if (!drv) {
598 goto unlink_and_fail;
599 }
600
601 /* Open the image */
602 ret = bdrv_open_common(bs, filename, flags, drv);
603 if (ret < 0) {
604 goto unlink_and_fail;
605 }
606
607 /* If there is a backing file, use it */
608 if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
609 char backing_filename[PATH_MAX];
610 int back_flags;
611 BlockDriver *back_drv = NULL;
612
613 bs->backing_hd = bdrv_new("");
614
615 if (path_has_protocol(bs->backing_file)) {
616 pstrcpy(backing_filename, sizeof(backing_filename),
617 bs->backing_file);
618 } else {
619 path_combine(backing_filename, sizeof(backing_filename),
620 filename, bs->backing_file);
621 }
622
623 if (bs->backing_format[0] != '\0') {
624 back_drv = bdrv_find_format(bs->backing_format);
625 }
626
627 /* backing files always opened read-only */
628 back_flags =
629 flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
630
631 ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
632 if (ret < 0) {
633 bdrv_close(bs);
634 return ret;
635 }
636 if (bs->is_temporary) {
637 bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
638 } else {
639 /* base image inherits from "parent" */
640 bs->backing_hd->keep_read_only = bs->keep_read_only;
641 }
642 }
643
644 if (!bdrv_key_required(bs)) {
645 /* call the change callback */
646 bs->media_changed = 1;
647 if (bs->change_cb)
648 bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
649 }
650
651 return 0;
652
653 unlink_and_fail:
654 if (bs->is_temporary) {
655 unlink(filename);
656 }
657 return ret;
658 }
659
660 void bdrv_close(BlockDriverState *bs)
661 {
662 if (bs->drv) {
663 if (bs == bs_snapshots) {
664 bs_snapshots = NULL;
665 }
666 if (bs->backing_hd) {
667 bdrv_delete(bs->backing_hd);
668 bs->backing_hd = NULL;
669 }
670 bs->drv->bdrv_close(bs);
671 qemu_free(bs->opaque);
672 #ifdef _WIN32
673 if (bs->is_temporary) {
674 unlink(bs->filename);
675 }
676 #endif
677 bs->opaque = NULL;
678 bs->drv = NULL;
679
680 if (bs->file != NULL) {
681 bdrv_close(bs->file);
682 }
683
684 /* call the change callback */
685 bs->media_changed = 1;
686 if (bs->change_cb)
687 bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
688 }
689 }
690
691 void bdrv_close_all(void)
692 {
693 BlockDriverState *bs;
694
695 QTAILQ_FOREACH(bs, &bdrv_states, list) {
696 bdrv_close(bs);
697 }
698 }
699
700 void bdrv_delete(BlockDriverState *bs)
701 {
702 assert(!bs->peer);
703
704 /* remove from list, if necessary */
705 if (bs->device_name[0] != '\0') {
706 QTAILQ_REMOVE(&bdrv_states, bs, list);
707 }
708
709 bdrv_close(bs);
710 if (bs->file != NULL) {
711 bdrv_delete(bs->file);
712 }
713
714 assert(bs != bs_snapshots);
715 qemu_free(bs);
716 }
717
718 int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
719 {
720 if (bs->peer) {
721 return -EBUSY;
722 }
723 bs->peer = qdev;
724 return 0;
725 }
726
727 void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
728 {
729 assert(bs->peer == qdev);
730 bs->peer = NULL;
731 }
732
733 DeviceState *bdrv_get_attached(BlockDriverState *bs)
734 {
735 return bs->peer;
736 }
737
738 /*
739 * Run consistency checks on an image
740 *
741 * Returns 0 if the check could be completed (it doesn't mean that the image is
742 * free of errors) or -errno when an internal error occured. The results of the
743 * check are stored in res.
744 */
745 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
746 {
747 if (bs->drv->bdrv_check == NULL) {
748 return -ENOTSUP;
749 }
750
751 memset(res, 0, sizeof(*res));
752 return bs->drv->bdrv_check(bs, res);
753 }
754
755 #define COMMIT_BUF_SECTORS 2048
756
757 /* commit COW file into the raw image */
758 int bdrv_commit(BlockDriverState *bs)
759 {
760 BlockDriver *drv = bs->drv;
761 BlockDriver *backing_drv;
762 int64_t sector, total_sectors;
763 int n, ro, open_flags;
764 int ret = 0, rw_ret = 0;
765 uint8_t *buf;
766 char filename[1024];
767 BlockDriverState *bs_rw, *bs_ro;
768
769 if (!drv)
770 return -ENOMEDIUM;
771
772 if (!bs->backing_hd) {
773 return -ENOTSUP;
774 }
775
776 if (bs->backing_hd->keep_read_only) {
777 return -EACCES;
778 }
779
780 backing_drv = bs->backing_hd->drv;
781 ro = bs->backing_hd->read_only;
782 strncpy(filename, bs->backing_hd->filename, sizeof(filename));
783 open_flags = bs->backing_hd->open_flags;
784
785 if (ro) {
786 /* re-open as RW */
787 bdrv_delete(bs->backing_hd);
788 bs->backing_hd = NULL;
789 bs_rw = bdrv_new("");
790 rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
791 backing_drv);
792 if (rw_ret < 0) {
793 bdrv_delete(bs_rw);
794 /* try to re-open read-only */
795 bs_ro = bdrv_new("");
796 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
797 backing_drv);
798 if (ret < 0) {
799 bdrv_delete(bs_ro);
800 /* drive not functional anymore */
801 bs->drv = NULL;
802 return ret;
803 }
804 bs->backing_hd = bs_ro;
805 return rw_ret;
806 }
807 bs->backing_hd = bs_rw;
808 }
809
810 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
811 buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
812
813 for (sector = 0; sector < total_sectors; sector += n) {
814 if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
815
816 if (bdrv_read(bs, sector, buf, n) != 0) {
817 ret = -EIO;
818 goto ro_cleanup;
819 }
820
821 if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
822 ret = -EIO;
823 goto ro_cleanup;
824 }
825 }
826 }
827
828 if (drv->bdrv_make_empty) {
829 ret = drv->bdrv_make_empty(bs);
830 bdrv_flush(bs);
831 }
832
833 /*
834 * Make sure all data we wrote to the backing device is actually
835 * stable on disk.
836 */
837 if (bs->backing_hd)
838 bdrv_flush(bs->backing_hd);
839
840 ro_cleanup:
841 qemu_free(buf);
842
843 if (ro) {
844 /* re-open as RO */
845 bdrv_delete(bs->backing_hd);
846 bs->backing_hd = NULL;
847 bs_ro = bdrv_new("");
848 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
849 backing_drv);
850 if (ret < 0) {
851 bdrv_delete(bs_ro);
852 /* drive not functional anymore */
853 bs->drv = NULL;
854 return ret;
855 }
856 bs->backing_hd = bs_ro;
857 bs->backing_hd->keep_read_only = 0;
858 }
859
860 return ret;
861 }
862
863 void bdrv_commit_all(void)
864 {
865 BlockDriverState *bs;
866
867 QTAILQ_FOREACH(bs, &bdrv_states, list) {
868 bdrv_commit(bs);
869 }
870 }
871
872 /*
873 * Return values:
874 * 0 - success
875 * -EINVAL - backing format specified, but no file
876 * -ENOSPC - can't update the backing file because no space is left in the
877 * image file header
878 * -ENOTSUP - format driver doesn't support changing the backing file
879 */
880 int bdrv_change_backing_file(BlockDriverState *bs,
881 const char *backing_file, const char *backing_fmt)
882 {
883 BlockDriver *drv = bs->drv;
884
885 if (drv->bdrv_change_backing_file != NULL) {
886 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
887 } else {
888 return -ENOTSUP;
889 }
890 }
891
892 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
893 size_t size)
894 {
895 int64_t len;
896
897 if (!bdrv_is_inserted(bs))
898 return -ENOMEDIUM;
899
900 if (bs->growable)
901 return 0;
902
903 len = bdrv_getlength(bs);
904
905 if (offset < 0)
906 return -EIO;
907
908 if ((offset > len) || (len - offset < size))
909 return -EIO;
910
911 return 0;
912 }
913
914 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
915 int nb_sectors)
916 {
917 return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
918 nb_sectors * BDRV_SECTOR_SIZE);
919 }
920
921 /* return < 0 if error. See bdrv_write() for the return codes */
922 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
923 uint8_t *buf, int nb_sectors)
924 {
925 BlockDriver *drv = bs->drv;
926
927 if (!drv)
928 return -ENOMEDIUM;
929 if (bdrv_check_request(bs, sector_num, nb_sectors))
930 return -EIO;
931
932 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
933 }
934
935 static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
936 int nb_sectors, int dirty)
937 {
938 int64_t start, end;
939 unsigned long val, idx, bit;
940
941 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
942 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
943
944 for (; start <= end; start++) {
945 idx = start / (sizeof(unsigned long) * 8);
946 bit = start % (sizeof(unsigned long) * 8);
947 val = bs->dirty_bitmap[idx];
948 if (dirty) {
949 if (!(val & (1UL << bit))) {
950 bs->dirty_count++;
951 val |= 1UL << bit;
952 }
953 } else {
954 if (val & (1UL << bit)) {
955 bs->dirty_count--;
956 val &= ~(1UL << bit);
957 }
958 }
959 bs->dirty_bitmap[idx] = val;
960 }
961 }
962
963 /* Return < 0 if error. Important errors are:
964 -EIO generic I/O error (may happen for all errors)
965 -ENOMEDIUM No media inserted.
966 -EINVAL Invalid sector number or nb_sectors
967 -EACCES Trying to write a read-only device
968 */
969 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
970 const uint8_t *buf, int nb_sectors)
971 {
972 BlockDriver *drv = bs->drv;
973 if (!bs->drv)
974 return -ENOMEDIUM;
975 if (bs->read_only)
976 return -EACCES;
977 if (bdrv_check_request(bs, sector_num, nb_sectors))
978 return -EIO;
979
980 if (bs->dirty_bitmap) {
981 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
982 }
983
984 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
985 bs->wr_highest_sector = sector_num + nb_sectors - 1;
986 }
987
988 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
989 }
990
991 int bdrv_pread(BlockDriverState *bs, int64_t offset,
992 void *buf, int count1)
993 {
994 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
995 int len, nb_sectors, count;
996 int64_t sector_num;
997 int ret;
998
999 count = count1;
1000 /* first read to align to sector start */
1001 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1002 if (len > count)
1003 len = count;
1004 sector_num = offset >> BDRV_SECTOR_BITS;
1005 if (len > 0) {
1006 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1007 return ret;
1008 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1009 count -= len;
1010 if (count == 0)
1011 return count1;
1012 sector_num++;
1013 buf += len;
1014 }
1015
1016 /* read the sectors "in place" */
1017 nb_sectors = count >> BDRV_SECTOR_BITS;
1018 if (nb_sectors > 0) {
1019 if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
1020 return ret;
1021 sector_num += nb_sectors;
1022 len = nb_sectors << BDRV_SECTOR_BITS;
1023 buf += len;
1024 count -= len;
1025 }
1026
1027 /* add data from the last sector */
1028 if (count > 0) {
1029 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1030 return ret;
1031 memcpy(buf, tmp_buf, count);
1032 }
1033 return count1;
1034 }
1035
1036 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
1037 const void *buf, int count1)
1038 {
1039 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1040 int len, nb_sectors, count;
1041 int64_t sector_num;
1042 int ret;
1043
1044 count = count1;
1045 /* first write to align to sector start */
1046 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1047 if (len > count)
1048 len = count;
1049 sector_num = offset >> BDRV_SECTOR_BITS;
1050 if (len > 0) {
1051 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1052 return ret;
1053 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1054 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1055 return ret;
1056 count -= len;
1057 if (count == 0)
1058 return count1;
1059 sector_num++;
1060 buf += len;
1061 }
1062
1063 /* write the sectors "in place" */
1064 nb_sectors = count >> BDRV_SECTOR_BITS;
1065 if (nb_sectors > 0) {
1066 if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
1067 return ret;
1068 sector_num += nb_sectors;
1069 len = nb_sectors << BDRV_SECTOR_BITS;
1070 buf += len;
1071 count -= len;
1072 }
1073
1074 /* add data from the last sector */
1075 if (count > 0) {
1076 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1077 return ret;
1078 memcpy(tmp_buf, buf, count);
1079 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1080 return ret;
1081 }
1082 return count1;
1083 }
1084
1085 /*
1086 * Writes to the file and ensures that no writes are reordered across this
1087 * request (acts as a barrier)
1088 *
1089 * Returns 0 on success, -errno in error cases.
1090 */
1091 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
1092 const void *buf, int count)
1093 {
1094 int ret;
1095
1096 ret = bdrv_pwrite(bs, offset, buf, count);
1097 if (ret < 0) {
1098 return ret;
1099 }
1100
1101 /* No flush needed for cache=writethrough, it uses O_DSYNC */
1102 if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
1103 bdrv_flush(bs);
1104 }
1105
1106 return 0;
1107 }
1108
1109 /*
1110 * Writes to the file and ensures that no writes are reordered across this
1111 * request (acts as a barrier)
1112 *
1113 * Returns 0 on success, -errno in error cases.
1114 */
1115 int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
1116 const uint8_t *buf, int nb_sectors)
1117 {
1118 return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
1119 buf, BDRV_SECTOR_SIZE * nb_sectors);
1120 }
1121
1122 /**
1123 * Truncate file to 'offset' bytes (needed only for file protocols)
1124 */
1125 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
1126 {
1127 BlockDriver *drv = bs->drv;
1128 int ret;
1129 if (!drv)
1130 return -ENOMEDIUM;
1131 if (!drv->bdrv_truncate)
1132 return -ENOTSUP;
1133 if (bs->read_only)
1134 return -EACCES;
1135 if (bdrv_in_use(bs))
1136 return -EBUSY;
1137 ret = drv->bdrv_truncate(bs, offset);
1138 if (ret == 0) {
1139 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1140 if (bs->change_cb) {
1141 bs->change_cb(bs->change_opaque, CHANGE_SIZE);
1142 }
1143 }
1144 return ret;
1145 }
1146
1147 /**
1148 * Length of a file in bytes. Return < 0 if error or unknown.
1149 */
1150 int64_t bdrv_getlength(BlockDriverState *bs)
1151 {
1152 BlockDriver *drv = bs->drv;
1153 if (!drv)
1154 return -ENOMEDIUM;
1155
1156 /* Fixed size devices use the total_sectors value for speed instead of
1157 issuing a length query (like lseek) on each call. Also, legacy block
1158 drivers don't provide a bdrv_getlength function and must use
1159 total_sectors. */
1160 if (!bs->growable || !drv->bdrv_getlength) {
1161 return bs->total_sectors * BDRV_SECTOR_SIZE;
1162 }
1163 return drv->bdrv_getlength(bs);
1164 }
1165
1166 /* return 0 as number of sectors if no device present or error */
1167 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1168 {
1169 int64_t length;
1170 length = bdrv_getlength(bs);
1171 if (length < 0)
1172 length = 0;
1173 else
1174 length = length >> BDRV_SECTOR_BITS;
1175 *nb_sectors_ptr = length;
1176 }
1177
1178 struct partition {
1179 uint8_t boot_ind; /* 0x80 - active */
1180 uint8_t head; /* starting head */
1181 uint8_t sector; /* starting sector */
1182 uint8_t cyl; /* starting cylinder */
1183 uint8_t sys_ind; /* What partition type */
1184 uint8_t end_head; /* end head */
1185 uint8_t end_sector; /* end sector */
1186 uint8_t end_cyl; /* end cylinder */
1187 uint32_t start_sect; /* starting sector counting from 0 */
1188 uint32_t nr_sects; /* nr of sectors in partition */
1189 } __attribute__((packed));
1190
1191 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1192 static int guess_disk_lchs(BlockDriverState *bs,
1193 int *pcylinders, int *pheads, int *psectors)
1194 {
1195 uint8_t buf[BDRV_SECTOR_SIZE];
1196 int ret, i, heads, sectors, cylinders;
1197 struct partition *p;
1198 uint32_t nr_sects;
1199 uint64_t nb_sectors;
1200
1201 bdrv_get_geometry(bs, &nb_sectors);
1202
1203 ret = bdrv_read(bs, 0, buf, 1);
1204 if (ret < 0)
1205 return -1;
1206 /* test msdos magic */
1207 if (buf[510] != 0x55 || buf[511] != 0xaa)
1208 return -1;
1209 for(i = 0; i < 4; i++) {
1210 p = ((struct partition *)(buf + 0x1be)) + i;
1211 nr_sects = le32_to_cpu(p->nr_sects);
1212 if (nr_sects && p->end_head) {
1213 /* We make the assumption that the partition terminates on
1214 a cylinder boundary */
1215 heads = p->end_head + 1;
1216 sectors = p->end_sector & 63;
1217 if (sectors == 0)
1218 continue;
1219 cylinders = nb_sectors / (heads * sectors);
1220 if (cylinders < 1 || cylinders > 16383)
1221 continue;
1222 *pheads = heads;
1223 *psectors = sectors;
1224 *pcylinders = cylinders;
1225 #if 0
1226 printf("guessed geometry: LCHS=%d %d %d\n",
1227 cylinders, heads, sectors);
1228 #endif
1229 return 0;
1230 }
1231 }
1232 return -1;
1233 }
1234
1235 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1236 {
1237 int translation, lba_detected = 0;
1238 int cylinders, heads, secs;
1239 uint64_t nb_sectors;
1240
1241 /* if a geometry hint is available, use it */
1242 bdrv_get_geometry(bs, &nb_sectors);
1243 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1244 translation = bdrv_get_translation_hint(bs);
1245 if (cylinders != 0) {
1246 *pcyls = cylinders;
1247 *pheads = heads;
1248 *psecs = secs;
1249 } else {
1250 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1251 if (heads > 16) {
1252 /* if heads > 16, it means that a BIOS LBA
1253 translation was active, so the default
1254 hardware geometry is OK */
1255 lba_detected = 1;
1256 goto default_geometry;
1257 } else {
1258 *pcyls = cylinders;
1259 *pheads = heads;
1260 *psecs = secs;
1261 /* disable any translation to be in sync with
1262 the logical geometry */
1263 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1264 bdrv_set_translation_hint(bs,
1265 BIOS_ATA_TRANSLATION_NONE);
1266 }
1267 }
1268 } else {
1269 default_geometry:
1270 /* if no geometry, use a standard physical disk geometry */
1271 cylinders = nb_sectors / (16 * 63);
1272
1273 if (cylinders > 16383)
1274 cylinders = 16383;
1275 else if (cylinders < 2)
1276 cylinders = 2;
1277 *pcyls = cylinders;
1278 *pheads = 16;
1279 *psecs = 63;
1280 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1281 if ((*pcyls * *pheads) <= 131072) {
1282 bdrv_set_translation_hint(bs,
1283 BIOS_ATA_TRANSLATION_LARGE);
1284 } else {
1285 bdrv_set_translation_hint(bs,
1286 BIOS_ATA_TRANSLATION_LBA);
1287 }
1288 }
1289 }
1290 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1291 }
1292 }
1293
1294 void bdrv_set_geometry_hint(BlockDriverState *bs,
1295 int cyls, int heads, int secs)
1296 {
1297 bs->cyls = cyls;
1298 bs->heads = heads;
1299 bs->secs = secs;
1300 }
1301
1302 void bdrv_set_type_hint(BlockDriverState *bs, int type)
1303 {
1304 bs->type = type;
1305 bs->removable = ((type == BDRV_TYPE_CDROM ||
1306 type == BDRV_TYPE_FLOPPY));
1307 }
1308
1309 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1310 {
1311 bs->translation = translation;
1312 }
1313
1314 void bdrv_get_geometry_hint(BlockDriverState *bs,
1315 int *pcyls, int *pheads, int *psecs)
1316 {
1317 *pcyls = bs->cyls;
1318 *pheads = bs->heads;
1319 *psecs = bs->secs;
1320 }
1321
1322 /* Recognize floppy formats */
1323 typedef struct FDFormat {
1324 FDriveType drive;
1325 uint8_t last_sect;
1326 uint8_t max_track;
1327 uint8_t max_head;
1328 } FDFormat;
1329
1330 static const FDFormat fd_formats[] = {
1331 /* First entry is default format */
1332 /* 1.44 MB 3"1/2 floppy disks */
1333 { FDRIVE_DRV_144, 18, 80, 1, },
1334 { FDRIVE_DRV_144, 20, 80, 1, },
1335 { FDRIVE_DRV_144, 21, 80, 1, },
1336 { FDRIVE_DRV_144, 21, 82, 1, },
1337 { FDRIVE_DRV_144, 21, 83, 1, },
1338 { FDRIVE_DRV_144, 22, 80, 1, },
1339 { FDRIVE_DRV_144, 23, 80, 1, },
1340 { FDRIVE_DRV_144, 24, 80, 1, },
1341 /* 2.88 MB 3"1/2 floppy disks */
1342 { FDRIVE_DRV_288, 36, 80, 1, },
1343 { FDRIVE_DRV_288, 39, 80, 1, },
1344 { FDRIVE_DRV_288, 40, 80, 1, },
1345 { FDRIVE_DRV_288, 44, 80, 1, },
1346 { FDRIVE_DRV_288, 48, 80, 1, },
1347 /* 720 kB 3"1/2 floppy disks */
1348 { FDRIVE_DRV_144, 9, 80, 1, },
1349 { FDRIVE_DRV_144, 10, 80, 1, },
1350 { FDRIVE_DRV_144, 10, 82, 1, },
1351 { FDRIVE_DRV_144, 10, 83, 1, },
1352 { FDRIVE_DRV_144, 13, 80, 1, },
1353 { FDRIVE_DRV_144, 14, 80, 1, },
1354 /* 1.2 MB 5"1/4 floppy disks */
1355 { FDRIVE_DRV_120, 15, 80, 1, },
1356 { FDRIVE_DRV_120, 18, 80, 1, },
1357 { FDRIVE_DRV_120, 18, 82, 1, },
1358 { FDRIVE_DRV_120, 18, 83, 1, },
1359 { FDRIVE_DRV_120, 20, 80, 1, },
1360 /* 720 kB 5"1/4 floppy disks */
1361 { FDRIVE_DRV_120, 9, 80, 1, },
1362 { FDRIVE_DRV_120, 11, 80, 1, },
1363 /* 360 kB 5"1/4 floppy disks */
1364 { FDRIVE_DRV_120, 9, 40, 1, },
1365 { FDRIVE_DRV_120, 9, 40, 0, },
1366 { FDRIVE_DRV_120, 10, 41, 1, },
1367 { FDRIVE_DRV_120, 10, 42, 1, },
1368 /* 320 kB 5"1/4 floppy disks */
1369 { FDRIVE_DRV_120, 8, 40, 1, },
1370 { FDRIVE_DRV_120, 8, 40, 0, },
1371 /* 360 kB must match 5"1/4 better than 3"1/2... */
1372 { FDRIVE_DRV_144, 9, 80, 0, },
1373 /* end */
1374 { FDRIVE_DRV_NONE, -1, -1, 0, },
1375 };
1376
1377 void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
1378 int *max_track, int *last_sect,
1379 FDriveType drive_in, FDriveType *drive)
1380 {
1381 const FDFormat *parse;
1382 uint64_t nb_sectors, size;
1383 int i, first_match, match;
1384
1385 bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect);
1386 if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) {
1387 /* User defined disk */
1388 } else {
1389 bdrv_get_geometry(bs, &nb_sectors);
1390 match = -1;
1391 first_match = -1;
1392 for (i = 0; ; i++) {
1393 parse = &fd_formats[i];
1394 if (parse->drive == FDRIVE_DRV_NONE) {
1395 break;
1396 }
1397 if (drive_in == parse->drive ||
1398 drive_in == FDRIVE_DRV_NONE) {
1399 size = (parse->max_head + 1) * parse->max_track *
1400 parse->last_sect;
1401 if (nb_sectors == size) {
1402 match = i;
1403 break;
1404 }
1405 if (first_match == -1) {
1406 first_match = i;
1407 }
1408 }
1409 }
1410 if (match == -1) {
1411 if (first_match == -1) {
1412 match = 1;
1413 } else {
1414 match = first_match;
1415 }
1416 parse = &fd_formats[match];
1417 }
1418 *nb_heads = parse->max_head + 1;
1419 *max_track = parse->max_track;
1420 *last_sect = parse->last_sect;
1421 *drive = parse->drive;
1422 }
1423 }
1424
1425 int bdrv_get_type_hint(BlockDriverState *bs)
1426 {
1427 return bs->type;
1428 }
1429
1430 int bdrv_get_translation_hint(BlockDriverState *bs)
1431 {
1432 return bs->translation;
1433 }
1434
1435 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
1436 BlockErrorAction on_write_error)
1437 {
1438 bs->on_read_error = on_read_error;
1439 bs->on_write_error = on_write_error;
1440 }
1441
1442 BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
1443 {
1444 return is_read ? bs->on_read_error : bs->on_write_error;
1445 }
1446
1447 void bdrv_set_removable(BlockDriverState *bs, int removable)
1448 {
1449 bs->removable = removable;
1450 if (removable && bs == bs_snapshots) {
1451 bs_snapshots = NULL;
1452 }
1453 }
1454
1455 int bdrv_is_removable(BlockDriverState *bs)
1456 {
1457 return bs->removable;
1458 }
1459
1460 int bdrv_is_read_only(BlockDriverState *bs)
1461 {
1462 return bs->read_only;
1463 }
1464
1465 int bdrv_is_sg(BlockDriverState *bs)
1466 {
1467 return bs->sg;
1468 }
1469
1470 int bdrv_enable_write_cache(BlockDriverState *bs)
1471 {
1472 return bs->enable_write_cache;
1473 }
1474
1475 /* XXX: no longer used */
1476 void bdrv_set_change_cb(BlockDriverState *bs,
1477 void (*change_cb)(void *opaque, int reason),
1478 void *opaque)
1479 {
1480 bs->change_cb = change_cb;
1481 bs->change_opaque = opaque;
1482 }
1483
1484 int bdrv_is_encrypted(BlockDriverState *bs)
1485 {
1486 if (bs->backing_hd && bs->backing_hd->encrypted)
1487 return 1;
1488 return bs->encrypted;
1489 }
1490
1491 int bdrv_key_required(BlockDriverState *bs)
1492 {
1493 BlockDriverState *backing_hd = bs->backing_hd;
1494
1495 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1496 return 1;
1497 return (bs->encrypted && !bs->valid_key);
1498 }
1499
1500 int bdrv_set_key(BlockDriverState *bs, const char *key)
1501 {
1502 int ret;
1503 if (bs->backing_hd && bs->backing_hd->encrypted) {
1504 ret = bdrv_set_key(bs->backing_hd, key);
1505 if (ret < 0)
1506 return ret;
1507 if (!bs->encrypted)
1508 return 0;
1509 }
1510 if (!bs->encrypted) {
1511 return -EINVAL;
1512 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
1513 return -ENOMEDIUM;
1514 }
1515 ret = bs->drv->bdrv_set_key(bs, key);
1516 if (ret < 0) {
1517 bs->valid_key = 0;
1518 } else if (!bs->valid_key) {
1519 bs->valid_key = 1;
1520 /* call the change callback now, we skipped it on open */
1521 bs->media_changed = 1;
1522 if (bs->change_cb)
1523 bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1524 }
1525 return ret;
1526 }
1527
1528 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1529 {
1530 if (!bs->drv) {
1531 buf[0] = '\0';
1532 } else {
1533 pstrcpy(buf, buf_size, bs->drv->format_name);
1534 }
1535 }
1536
1537 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1538 void *opaque)
1539 {
1540 BlockDriver *drv;
1541
1542 QLIST_FOREACH(drv, &bdrv_drivers, list) {
1543 it(opaque, drv->format_name);
1544 }
1545 }
1546
1547 BlockDriverState *bdrv_find(const char *name)
1548 {
1549 BlockDriverState *bs;
1550
1551 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1552 if (!strcmp(name, bs->device_name)) {
1553 return bs;
1554 }
1555 }
1556 return NULL;
1557 }
1558
1559 BlockDriverState *bdrv_next(BlockDriverState *bs)
1560 {
1561 if (!bs) {
1562 return QTAILQ_FIRST(&bdrv_states);
1563 }
1564 return QTAILQ_NEXT(bs, list);
1565 }
1566
1567 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1568 {
1569 BlockDriverState *bs;
1570
1571 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1572 it(opaque, bs);
1573 }
1574 }
1575
1576 const char *bdrv_get_device_name(BlockDriverState *bs)
1577 {
1578 return bs->device_name;
1579 }
1580
1581 int bdrv_flush(BlockDriverState *bs)
1582 {
1583 if (bs->open_flags & BDRV_O_NO_FLUSH) {
1584 return 0;
1585 }
1586
1587 if (bs->drv && bs->drv->bdrv_flush) {
1588 return bs->drv->bdrv_flush(bs);
1589 }
1590
1591 /*
1592 * Some block drivers always operate in either writethrough or unsafe mode
1593 * and don't support bdrv_flush therefore. Usually qemu doesn't know how
1594 * the server works (because the behaviour is hardcoded or depends on
1595 * server-side configuration), so we can't ensure that everything is safe
1596 * on disk. Returning an error doesn't work because that would break guests
1597 * even if the server operates in writethrough mode.
1598 *
1599 * Let's hope the user knows what he's doing.
1600 */
1601 return 0;
1602 }
1603
1604 void bdrv_flush_all(void)
1605 {
1606 BlockDriverState *bs;
1607
1608 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1609 if (bs->drv && !bdrv_is_read_only(bs) &&
1610 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1611 bdrv_flush(bs);
1612 }
1613 }
1614 }
1615
1616 int bdrv_has_zero_init(BlockDriverState *bs)
1617 {
1618 assert(bs->drv);
1619
1620 if (bs->drv->bdrv_has_zero_init) {
1621 return bs->drv->bdrv_has_zero_init(bs);
1622 }
1623
1624 return 1;
1625 }
1626
1627 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
1628 {
1629 if (!bs->drv) {
1630 return -ENOMEDIUM;
1631 }
1632 if (!bs->drv->bdrv_discard) {
1633 return 0;
1634 }
1635 return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
1636 }
1637
1638 /*
1639 * Returns true iff the specified sector is present in the disk image. Drivers
1640 * not implementing the functionality are assumed to not support backing files,
1641 * hence all their sectors are reported as allocated.
1642 *
1643 * 'pnum' is set to the number of sectors (including and immediately following
1644 * the specified sector) that are known to be in the same
1645 * allocated/unallocated state.
1646 *
1647 * 'nb_sectors' is the max value 'pnum' should be set to.
1648 */
1649 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1650 int *pnum)
1651 {
1652 int64_t n;
1653 if (!bs->drv->bdrv_is_allocated) {
1654 if (sector_num >= bs->total_sectors) {
1655 *pnum = 0;
1656 return 0;
1657 }
1658 n = bs->total_sectors - sector_num;
1659 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1660 return 1;
1661 }
1662 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1663 }
1664
1665 void bdrv_mon_event(const BlockDriverState *bdrv,
1666 BlockMonEventAction action, int is_read)
1667 {
1668 QObject *data;
1669 const char *action_str;
1670
1671 switch (action) {
1672 case BDRV_ACTION_REPORT:
1673 action_str = "report";
1674 break;
1675 case BDRV_ACTION_IGNORE:
1676 action_str = "ignore";
1677 break;
1678 case BDRV_ACTION_STOP:
1679 action_str = "stop";
1680 break;
1681 default:
1682 abort();
1683 }
1684
1685 data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1686 bdrv->device_name,
1687 action_str,
1688 is_read ? "read" : "write");
1689 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
1690
1691 qobject_decref(data);
1692 }
1693
1694 static void bdrv_print_dict(QObject *obj, void *opaque)
1695 {
1696 QDict *bs_dict;
1697 Monitor *mon = opaque;
1698
1699 bs_dict = qobject_to_qdict(obj);
1700
1701 monitor_printf(mon, "%s: type=%s removable=%d",
1702 qdict_get_str(bs_dict, "device"),
1703 qdict_get_str(bs_dict, "type"),
1704 qdict_get_bool(bs_dict, "removable"));
1705
1706 if (qdict_get_bool(bs_dict, "removable")) {
1707 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1708 }
1709
1710 if (qdict_haskey(bs_dict, "inserted")) {
1711 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1712
1713 monitor_printf(mon, " file=");
1714 monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1715 if (qdict_haskey(qdict, "backing_file")) {
1716 monitor_printf(mon, " backing_file=");
1717 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1718 }
1719 monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1720 qdict_get_bool(qdict, "ro"),
1721 qdict_get_str(qdict, "drv"),
1722 qdict_get_bool(qdict, "encrypted"));
1723 } else {
1724 monitor_printf(mon, " [not inserted]");
1725 }
1726
1727 monitor_printf(mon, "\n");
1728 }
1729
1730 void bdrv_info_print(Monitor *mon, const QObject *data)
1731 {
1732 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1733 }
1734
1735 void bdrv_info(Monitor *mon, QObject **ret_data)
1736 {
1737 QList *bs_list;
1738 BlockDriverState *bs;
1739
1740 bs_list = qlist_new();
1741
1742 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1743 QObject *bs_obj;
1744 const char *type = "unknown";
1745
1746 switch(bs->type) {
1747 case BDRV_TYPE_HD:
1748 type = "hd";
1749 break;
1750 case BDRV_TYPE_CDROM:
1751 type = "cdrom";
1752 break;
1753 case BDRV_TYPE_FLOPPY:
1754 type = "floppy";
1755 break;
1756 }
1757
1758 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1759 "'removable': %i, 'locked': %i }",
1760 bs->device_name, type, bs->removable,
1761 bs->locked);
1762
1763 if (bs->drv) {
1764 QObject *obj;
1765 QDict *bs_dict = qobject_to_qdict(bs_obj);
1766
1767 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1768 "'encrypted': %i }",
1769 bs->filename, bs->read_only,
1770 bs->drv->format_name,
1771 bdrv_is_encrypted(bs));
1772 if (bs->backing_file[0] != '\0') {
1773 QDict *qdict = qobject_to_qdict(obj);
1774 qdict_put(qdict, "backing_file",
1775 qstring_from_str(bs->backing_file));
1776 }
1777
1778 qdict_put_obj(bs_dict, "inserted", obj);
1779 }
1780 qlist_append_obj(bs_list, bs_obj);
1781 }
1782
1783 *ret_data = QOBJECT(bs_list);
1784 }
1785
1786 static void bdrv_stats_iter(QObject *data, void *opaque)
1787 {
1788 QDict *qdict;
1789 Monitor *mon = opaque;
1790
1791 qdict = qobject_to_qdict(data);
1792 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1793
1794 qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1795 monitor_printf(mon, " rd_bytes=%" PRId64
1796 " wr_bytes=%" PRId64
1797 " rd_operations=%" PRId64
1798 " wr_operations=%" PRId64
1799 "\n",
1800 qdict_get_int(qdict, "rd_bytes"),
1801 qdict_get_int(qdict, "wr_bytes"),
1802 qdict_get_int(qdict, "rd_operations"),
1803 qdict_get_int(qdict, "wr_operations"));
1804 }
1805
1806 void bdrv_stats_print(Monitor *mon, const QObject *data)
1807 {
1808 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1809 }
1810
1811 static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
1812 {
1813 QObject *res;
1814 QDict *dict;
1815
1816 res = qobject_from_jsonf("{ 'stats': {"
1817 "'rd_bytes': %" PRId64 ","
1818 "'wr_bytes': %" PRId64 ","
1819 "'rd_operations': %" PRId64 ","
1820 "'wr_operations': %" PRId64 ","
1821 "'wr_highest_offset': %" PRId64
1822 "} }",
1823 bs->rd_bytes, bs->wr_bytes,
1824 bs->rd_ops, bs->wr_ops,
1825 bs->wr_highest_sector *
1826 (uint64_t)BDRV_SECTOR_SIZE);
1827 dict = qobject_to_qdict(res);
1828
1829 if (*bs->device_name) {
1830 qdict_put(dict, "device", qstring_from_str(bs->device_name));
1831 }
1832
1833 if (bs->file) {
1834 QObject *parent = bdrv_info_stats_bs(bs->file);
1835 qdict_put_obj(dict, "parent", parent);
1836 }
1837
1838 return res;
1839 }
1840
1841 void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1842 {
1843 QObject *obj;
1844 QList *devices;
1845 BlockDriverState *bs;
1846
1847 devices = qlist_new();
1848
1849 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1850 obj = bdrv_info_stats_bs(bs);
1851 qlist_append_obj(devices, obj);
1852 }
1853
1854 *ret_data = QOBJECT(devices);
1855 }
1856
1857 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1858 {
1859 if (bs->backing_hd && bs->backing_hd->encrypted)
1860 return bs->backing_file;
1861 else if (bs->encrypted)
1862 return bs->filename;
1863 else
1864 return NULL;
1865 }
1866
1867 void bdrv_get_backing_filename(BlockDriverState *bs,
1868 char *filename, int filename_size)
1869 {
1870 if (!bs->backing_file) {
1871 pstrcpy(filename, filename_size, "");
1872 } else {
1873 pstrcpy(filename, filename_size, bs->backing_file);
1874 }
1875 }
1876
1877 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1878 const uint8_t *buf, int nb_sectors)
1879 {
1880 BlockDriver *drv = bs->drv;
1881 if (!drv)
1882 return -ENOMEDIUM;
1883 if (!drv->bdrv_write_compressed)
1884 return -ENOTSUP;
1885 if (bdrv_check_request(bs, sector_num, nb_sectors))
1886 return -EIO;
1887
1888 if (bs->dirty_bitmap) {
1889 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1890 }
1891
1892 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1893 }
1894
1895 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1896 {
1897 BlockDriver *drv = bs->drv;
1898 if (!drv)
1899 return -ENOMEDIUM;
1900 if (!drv->bdrv_get_info)
1901 return -ENOTSUP;
1902 memset(bdi, 0, sizeof(*bdi));
1903 return drv->bdrv_get_info(bs, bdi);
1904 }
1905
1906 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1907 int64_t pos, int size)
1908 {
1909 BlockDriver *drv = bs->drv;
1910 if (!drv)
1911 return -ENOMEDIUM;
1912 if (drv->bdrv_save_vmstate)
1913 return drv->bdrv_save_vmstate(bs, buf, pos, size);
1914 if (bs->file)
1915 return bdrv_save_vmstate(bs->file, buf, pos, size);
1916 return -ENOTSUP;
1917 }
1918
1919 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1920 int64_t pos, int size)
1921 {
1922 BlockDriver *drv = bs->drv;
1923 if (!drv)
1924 return -ENOMEDIUM;
1925 if (drv->bdrv_load_vmstate)
1926 return drv->bdrv_load_vmstate(bs, buf, pos, size);
1927 if (bs->file)
1928 return bdrv_load_vmstate(bs->file, buf, pos, size);
1929 return -ENOTSUP;
1930 }
1931
1932 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
1933 {
1934 BlockDriver *drv = bs->drv;
1935
1936 if (!drv || !drv->bdrv_debug_event) {
1937 return;
1938 }
1939
1940 return drv->bdrv_debug_event(bs, event);
1941
1942 }
1943
1944 /**************************************************************/
1945 /* handling of snapshots */
1946
1947 int bdrv_can_snapshot(BlockDriverState *bs)
1948 {
1949 BlockDriver *drv = bs->drv;
1950 if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1951 return 0;
1952 }
1953
1954 if (!drv->bdrv_snapshot_create) {
1955 if (bs->file != NULL) {
1956 return bdrv_can_snapshot(bs->file);
1957 }
1958 return 0;
1959 }
1960
1961 return 1;
1962 }
1963
1964 int bdrv_is_snapshot(BlockDriverState *bs)
1965 {
1966 return !!(bs->open_flags & BDRV_O_SNAPSHOT);
1967 }
1968
1969 BlockDriverState *bdrv_snapshots(void)
1970 {
1971 BlockDriverState *bs;
1972
1973 if (bs_snapshots) {
1974 return bs_snapshots;
1975 }
1976
1977 bs = NULL;
1978 while ((bs = bdrv_next(bs))) {
1979 if (bdrv_can_snapshot(bs)) {
1980 bs_snapshots = bs;
1981 return bs;
1982 }
1983 }
1984 return NULL;
1985 }
1986
1987 int bdrv_snapshot_create(BlockDriverState *bs,
1988 QEMUSnapshotInfo *sn_info)
1989 {
1990 BlockDriver *drv = bs->drv;
1991 if (!drv)
1992 return -ENOMEDIUM;
1993 if (drv->bdrv_snapshot_create)
1994 return drv->bdrv_snapshot_create(bs, sn_info);
1995 if (bs->file)
1996 return bdrv_snapshot_create(bs->file, sn_info);
1997 return -ENOTSUP;
1998 }
1999
2000 int bdrv_snapshot_goto(BlockDriverState *bs,
2001 const char *snapshot_id)
2002 {
2003 BlockDriver *drv = bs->drv;
2004 int ret, open_ret;
2005
2006 if (!drv)
2007 return -ENOMEDIUM;
2008 if (drv->bdrv_snapshot_goto)
2009 return drv->bdrv_snapshot_goto(bs, snapshot_id);
2010
2011 if (bs->file) {
2012 drv->bdrv_close(bs);
2013 ret = bdrv_snapshot_goto(bs->file, snapshot_id);
2014 open_ret = drv->bdrv_open(bs, bs->open_flags);
2015 if (open_ret < 0) {
2016 bdrv_delete(bs->file);
2017 bs->drv = NULL;
2018 return open_ret;
2019 }
2020 return ret;
2021 }
2022
2023 return -ENOTSUP;
2024 }
2025
2026 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
2027 {
2028 BlockDriver *drv = bs->drv;
2029 if (!drv)
2030 return -ENOMEDIUM;
2031 if (drv->bdrv_snapshot_delete)
2032 return drv->bdrv_snapshot_delete(bs, snapshot_id);
2033 if (bs->file)
2034 return bdrv_snapshot_delete(bs->file, snapshot_id);
2035 return -ENOTSUP;
2036 }
2037
2038 int bdrv_snapshot_list(BlockDriverState *bs,
2039 QEMUSnapshotInfo **psn_info)
2040 {
2041 BlockDriver *drv = bs->drv;
2042 if (!drv)
2043 return -ENOMEDIUM;
2044 if (drv->bdrv_snapshot_list)
2045 return drv->bdrv_snapshot_list(bs, psn_info);
2046 if (bs->file)
2047 return bdrv_snapshot_list(bs->file, psn_info);
2048 return -ENOTSUP;
2049 }
2050
2051 int bdrv_snapshot_load_tmp(BlockDriverState *bs,
2052 const char *snapshot_name)
2053 {
2054 BlockDriver *drv = bs->drv;
2055 if (!drv) {
2056 return -ENOMEDIUM;
2057 }
2058 if (!bs->read_only) {
2059 return -EINVAL;
2060 }
2061 if (drv->bdrv_snapshot_load_tmp) {
2062 return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
2063 }
2064 return -ENOTSUP;
2065 }
2066
2067 #define NB_SUFFIXES 4
2068
2069 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
2070 {
2071 static const char suffixes[NB_SUFFIXES] = "KMGT";
2072 int64_t base;
2073 int i;
2074
2075 if (size <= 999) {
2076 snprintf(buf, buf_size, "%" PRId64, size);
2077 } else {
2078 base = 1024;
2079 for(i = 0; i < NB_SUFFIXES; i++) {
2080 if (size < (10 * base)) {
2081 snprintf(buf, buf_size, "%0.1f%c",
2082 (double)size / base,
2083 suffixes[i]);
2084 break;
2085 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
2086 snprintf(buf, buf_size, "%" PRId64 "%c",
2087 ((size + (base >> 1)) / base),
2088 suffixes[i]);
2089 break;
2090 }
2091 base = base * 1024;
2092 }
2093 }
2094 return buf;
2095 }
2096
2097 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
2098 {
2099 char buf1[128], date_buf[128], clock_buf[128];
2100 #ifdef _WIN32
2101 struct tm *ptm;
2102 #else
2103 struct tm tm;
2104 #endif
2105 time_t ti;
2106 int64_t secs;
2107
2108 if (!sn) {
2109 snprintf(buf, buf_size,
2110 "%-10s%-20s%7s%20s%15s",
2111 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2112 } else {
2113 ti = sn->date_sec;
2114 #ifdef _WIN32
2115 ptm = localtime(&ti);
2116 strftime(date_buf, sizeof(date_buf),
2117 "%Y-%m-%d %H:%M:%S", ptm);
2118 #else
2119 localtime_r(&ti, &tm);
2120 strftime(date_buf, sizeof(date_buf),
2121 "%Y-%m-%d %H:%M:%S", &tm);
2122 #endif
2123 secs = sn->vm_clock_nsec / 1000000000;
2124 snprintf(clock_buf, sizeof(clock_buf),
2125 "%02d:%02d:%02d.%03d",
2126 (int)(secs / 3600),
2127 (int)((secs / 60) % 60),
2128 (int)(secs % 60),
2129 (int)((sn->vm_clock_nsec / 1000000) % 1000));
2130 snprintf(buf, buf_size,
2131 "%-10s%-20s%7s%20s%15s",
2132 sn->id_str, sn->name,
2133 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
2134 date_buf,
2135 clock_buf);
2136 }
2137 return buf;
2138 }
2139
2140
2141 /**************************************************************/
2142 /* async I/Os */
2143
2144 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
2145 QEMUIOVector *qiov, int nb_sectors,
2146 BlockDriverCompletionFunc *cb, void *opaque)
2147 {
2148 BlockDriver *drv = bs->drv;
2149 BlockDriverAIOCB *ret;
2150
2151 trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
2152
2153 if (!drv)
2154 return NULL;
2155 if (bdrv_check_request(bs, sector_num, nb_sectors))
2156 return NULL;
2157
2158 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
2159 cb, opaque);
2160
2161 if (ret) {
2162 /* Update stats even though technically transfer has not happened. */
2163 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
2164 bs->rd_ops ++;
2165 }
2166
2167 return ret;
2168 }
2169
2170 typedef struct BlockCompleteData {
2171 BlockDriverCompletionFunc *cb;
2172 void *opaque;
2173 BlockDriverState *bs;
2174 int64_t sector_num;
2175 int nb_sectors;
2176 } BlockCompleteData;
2177
2178 static void block_complete_cb(void *opaque, int ret)
2179 {
2180 BlockCompleteData *b = opaque;
2181
2182 if (b->bs->dirty_bitmap) {
2183 set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
2184 }
2185 b->cb(b->opaque, ret);
2186 qemu_free(b);
2187 }
2188
2189 static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
2190 int64_t sector_num,
2191 int nb_sectors,
2192 BlockDriverCompletionFunc *cb,
2193 void *opaque)
2194 {
2195 BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
2196
2197 blkdata->bs = bs;
2198 blkdata->cb = cb;
2199 blkdata->opaque = opaque;
2200 blkdata->sector_num = sector_num;
2201 blkdata->nb_sectors = nb_sectors;
2202
2203 return blkdata;
2204 }
2205
2206 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
2207 QEMUIOVector *qiov, int nb_sectors,
2208 BlockDriverCompletionFunc *cb, void *opaque)
2209 {
2210 BlockDriver *drv = bs->drv;
2211 BlockDriverAIOCB *ret;
2212 BlockCompleteData *blk_cb_data;
2213
2214 trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
2215
2216 if (!drv)
2217 return NULL;
2218 if (bs->read_only)
2219 return NULL;
2220 if (bdrv_check_request(bs, sector_num, nb_sectors))
2221 return NULL;
2222
2223 if (bs->dirty_bitmap) {
2224 blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
2225 opaque);
2226 cb = &block_complete_cb;
2227 opaque = blk_cb_data;
2228 }
2229
2230 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
2231 cb, opaque);
2232
2233 if (ret) {
2234 /* Update stats even though technically transfer has not happened. */
2235 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
2236 bs->wr_ops ++;
2237 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
2238 bs->wr_highest_sector = sector_num + nb_sectors - 1;
2239 }
2240 }
2241
2242 return ret;
2243 }
2244
2245
2246 typedef struct MultiwriteCB {
2247 int error;
2248 int num_requests;
2249 int num_callbacks;
2250 struct {
2251 BlockDriverCompletionFunc *cb;
2252 void *opaque;
2253 QEMUIOVector *free_qiov;
2254 void *free_buf;
2255 } callbacks[];
2256 } MultiwriteCB;
2257
2258 static void multiwrite_user_cb(MultiwriteCB *mcb)
2259 {
2260 int i;
2261
2262 for (i = 0; i < mcb->num_callbacks; i++) {
2263 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
2264 if (mcb->callbacks[i].free_qiov) {
2265 qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
2266 }
2267 qemu_free(mcb->callbacks[i].free_qiov);
2268 qemu_vfree(mcb->callbacks[i].free_buf);
2269 }
2270 }
2271
2272 static void multiwrite_cb(void *opaque, int ret)
2273 {
2274 MultiwriteCB *mcb = opaque;
2275
2276 trace_multiwrite_cb(mcb, ret);
2277
2278 if (ret < 0 && !mcb->error) {
2279 mcb->error = ret;
2280 }
2281
2282 mcb->num_requests--;
2283 if (mcb->num_requests == 0) {
2284 multiwrite_user_cb(mcb);
2285 qemu_free(mcb);
2286 }
2287 }
2288
2289 static int multiwrite_req_compare(const void *a, const void *b)
2290 {
2291 const BlockRequest *req1 = a, *req2 = b;
2292
2293 /*
2294 * Note that we can't simply subtract req2->sector from req1->sector
2295 * here as that could overflow the return value.
2296 */
2297 if (req1->sector > req2->sector) {
2298 return 1;
2299 } else if (req1->sector < req2->sector) {
2300 return -1;
2301 } else {
2302 return 0;
2303 }
2304 }
2305
2306 /*
2307 * Takes a bunch of requests and tries to merge them. Returns the number of
2308 * requests that remain after merging.
2309 */
2310 static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
2311 int num_reqs, MultiwriteCB *mcb)
2312 {
2313 int i, outidx;
2314
2315 // Sort requests by start sector
2316 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
2317
2318 // Check if adjacent requests touch the same clusters. If so, combine them,
2319 // filling up gaps with zero sectors.
2320 outidx = 0;
2321 for (i = 1; i < num_reqs; i++) {
2322 int merge = 0;
2323 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
2324
2325 // This handles the cases that are valid for all block drivers, namely
2326 // exactly sequential writes and overlapping writes.
2327 if (reqs[i].sector <= oldreq_last) {
2328 merge = 1;
2329 }
2330
2331 // The block driver may decide that it makes sense to combine requests
2332 // even if there is a gap of some sectors between them. In this case,
2333 // the gap is filled with zeros (therefore only applicable for yet
2334 // unused space in format like qcow2).
2335 if (!merge && bs->drv->bdrv_merge_requests) {
2336 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
2337 }
2338
2339 if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
2340 merge = 0;
2341 }
2342
2343 if (merge) {
2344 size_t size;
2345 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
2346 qemu_iovec_init(qiov,
2347 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
2348
2349 // Add the first request to the merged one. If the requests are
2350 // overlapping, drop the last sectors of the first request.
2351 size = (reqs[i].sector - reqs[outidx].sector) << 9;
2352 qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
2353
2354 // We might need to add some zeros between the two requests
2355 if (reqs[i].sector > oldreq_last) {
2356 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
2357 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
2358 memset(buf, 0, zero_bytes);
2359 qemu_iovec_add(qiov, buf, zero_bytes);
2360 mcb->callbacks[i].free_buf = buf;
2361 }
2362
2363 // Add the second request
2364 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
2365
2366 reqs[outidx].nb_sectors = qiov->size >> 9;
2367 reqs[outidx].qiov = qiov;
2368
2369 mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
2370 } else {
2371 outidx++;
2372 reqs[outidx].sector = reqs[i].sector;
2373 reqs[outidx].nb_sectors = reqs[i].nb_sectors;
2374 reqs[outidx].qiov = reqs[i].qiov;
2375 }
2376 }
2377
2378 return outidx + 1;
2379 }
2380
2381 /*
2382 * Submit multiple AIO write requests at once.
2383 *
2384 * On success, the function returns 0 and all requests in the reqs array have
2385 * been submitted. In error case this function returns -1, and any of the
2386 * requests may or may not be submitted yet. In particular, this means that the
2387 * callback will be called for some of the requests, for others it won't. The
2388 * caller must check the error field of the BlockRequest to wait for the right
2389 * callbacks (if error != 0, no callback will be called).
2390 *
2391 * The implementation may modify the contents of the reqs array, e.g. to merge
2392 * requests. However, the fields opaque and error are left unmodified as they
2393 * are used to signal failure for a single request to the caller.
2394 */
2395 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
2396 {
2397 BlockDriverAIOCB *acb;
2398 MultiwriteCB *mcb;
2399 int i;
2400
2401 if (num_reqs == 0) {
2402 return 0;
2403 }
2404
2405 // Create MultiwriteCB structure
2406 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
2407 mcb->num_requests = 0;
2408 mcb->num_callbacks = num_reqs;
2409
2410 for (i = 0; i < num_reqs; i++) {
2411 mcb->callbacks[i].cb = reqs[i].cb;
2412 mcb->callbacks[i].opaque = reqs[i].opaque;
2413 }
2414
2415 // Check for mergable requests
2416 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2417
2418 trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
2419
2420 /*
2421 * Run the aio requests. As soon as one request can't be submitted
2422 * successfully, fail all requests that are not yet submitted (we must
2423 * return failure for all requests anyway)
2424 *
2425 * num_requests cannot be set to the right value immediately: If
2426 * bdrv_aio_writev fails for some request, num_requests would be too high
2427 * and therefore multiwrite_cb() would never recognize the multiwrite
2428 * request as completed. We also cannot use the loop variable i to set it
2429 * when the first request fails because the callback may already have been
2430 * called for previously submitted requests. Thus, num_requests must be
2431 * incremented for each request that is submitted.
2432 *
2433 * The problem that callbacks may be called early also means that we need
2434 * to take care that num_requests doesn't become 0 before all requests are
2435 * submitted - multiwrite_cb() would consider the multiwrite request
2436 * completed. A dummy request that is "completed" by a manual call to
2437 * multiwrite_cb() takes care of this.
2438 */
2439 mcb->num_requests = 1;
2440
2441 // Run the aio requests
2442 for (i = 0; i < num_reqs; i++) {
2443 mcb->num_requests++;
2444 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2445 reqs[i].nb_sectors, multiwrite_cb, mcb);
2446
2447 if (acb == NULL) {
2448 // We can only fail the whole thing if no request has been
2449 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2450 // complete and report the error in the callback.
2451 if (i == 0) {
2452 trace_bdrv_aio_multiwrite_earlyfail(mcb);
2453 goto fail;
2454 } else {
2455 trace_bdrv_aio_multiwrite_latefail(mcb, i);
2456 multiwrite_cb(mcb, -EIO);
2457 break;
2458 }
2459 }
2460 }
2461
2462 /* Complete the dummy request */
2463 multiwrite_cb(mcb, 0);
2464
2465 return 0;
2466
2467 fail:
2468 for (i = 0; i < mcb->num_callbacks; i++) {
2469 reqs[i].error = -EIO;
2470 }
2471 qemu_free(mcb);
2472 return -1;
2473 }
2474
2475 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2476 BlockDriverCompletionFunc *cb, void *opaque)
2477 {
2478 BlockDriver *drv = bs->drv;
2479
2480 if (bs->open_flags & BDRV_O_NO_FLUSH) {
2481 return bdrv_aio_noop_em(bs, cb, opaque);
2482 }
2483
2484 if (!drv)
2485 return NULL;
2486 return drv->bdrv_aio_flush(bs, cb, opaque);
2487 }
2488
2489 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
2490 {
2491 acb->pool->cancel(acb);
2492 }
2493
2494
2495 /**************************************************************/
2496 /* async block device emulation */
2497
2498 typedef struct BlockDriverAIOCBSync {
2499 BlockDriverAIOCB common;
2500 QEMUBH *bh;
2501 int ret;
2502 /* vector translation state */
2503 QEMUIOVector *qiov;
2504 uint8_t *bounce;
2505 int is_write;
2506 } BlockDriverAIOCBSync;
2507
2508 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2509 {
2510 BlockDriverAIOCBSync *acb =
2511 container_of(blockacb, BlockDriverAIOCBSync, common);
2512 qemu_bh_delete(acb->bh);
2513 acb->bh = NULL;
2514 qemu_aio_release(acb);
2515 }
2516
2517 static AIOPool bdrv_em_aio_pool = {
2518 .aiocb_size = sizeof(BlockDriverAIOCBSync),
2519 .cancel = bdrv_aio_cancel_em,
2520 };
2521
2522 static void bdrv_aio_bh_cb(void *opaque)
2523 {
2524 BlockDriverAIOCBSync *acb = opaque;
2525
2526 if (!acb->is_write)
2527 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2528 qemu_vfree(acb->bounce);
2529 acb->common.cb(acb->common.opaque, acb->ret);
2530 qemu_bh_delete(acb->bh);
2531 acb->bh = NULL;
2532 qemu_aio_release(acb);
2533 }
2534
2535 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2536 int64_t sector_num,
2537 QEMUIOVector *qiov,
2538 int nb_sectors,
2539 BlockDriverCompletionFunc *cb,
2540 void *opaque,
2541 int is_write)
2542
2543 {
2544 BlockDriverAIOCBSync *acb;
2545
2546 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2547 acb->is_write = is_write;
2548 acb->qiov = qiov;
2549 acb->bounce = qemu_blockalign(bs, qiov->size);
2550
2551 if (!acb->bh)
2552 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2553
2554 if (is_write) {
2555 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2556 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2557 } else {
2558 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2559 }
2560
2561 qemu_bh_schedule(acb->bh);
2562
2563 return &acb->common;
2564 }
2565
2566 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2567 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2568 BlockDriverCompletionFunc *cb, void *opaque)
2569 {
2570 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
2571 }
2572
2573 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2574 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2575 BlockDriverCompletionFunc *cb, void *opaque)
2576 {
2577 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
2578 }
2579
2580 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2581 BlockDriverCompletionFunc *cb, void *opaque)
2582 {
2583 BlockDriverAIOCBSync *acb;
2584
2585 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2586 acb->is_write = 1; /* don't bounce in the completion hadler */
2587 acb->qiov = NULL;
2588 acb->bounce = NULL;
2589 acb->ret = 0;
2590
2591 if (!acb->bh)
2592 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2593
2594 bdrv_flush(bs);
2595 qemu_bh_schedule(acb->bh);
2596 return &acb->common;
2597 }
2598
2599 static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
2600 BlockDriverCompletionFunc *cb, void *opaque)
2601 {
2602 BlockDriverAIOCBSync *acb;
2603
2604 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2605 acb->is_write = 1; /* don't bounce in the completion handler */
2606 acb->qiov = NULL;
2607 acb->bounce = NULL;
2608 acb->ret = 0;
2609
2610 if (!acb->bh) {
2611 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2612 }
2613
2614 qemu_bh_schedule(acb->bh);
2615 return &acb->common;
2616 }
2617
2618 /**************************************************************/
2619 /* sync block device emulation */
2620
2621 static void bdrv_rw_em_cb(void *opaque, int ret)
2622 {
2623 *(int *)opaque = ret;
2624 }
2625
2626 #define NOT_DONE 0x7fffffff
2627
2628 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
2629 uint8_t *buf, int nb_sectors)
2630 {
2631 int async_ret;
2632 BlockDriverAIOCB *acb;
2633 struct iovec iov;
2634 QEMUIOVector qiov;
2635
2636 async_context_push();
2637
2638 async_ret = NOT_DONE;
2639 iov.iov_base = (void *)buf;
2640 iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2641 qemu_iovec_init_external(&qiov, &iov, 1);
2642 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2643 bdrv_rw_em_cb, &async_ret);
2644 if (acb == NULL) {
2645 async_ret = -1;
2646 goto fail;
2647 }
2648
2649 while (async_ret == NOT_DONE) {
2650 qemu_aio_wait();
2651 }
2652
2653
2654 fail:
2655 async_context_pop();
2656 return async_ret;
2657 }
2658
2659 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2660 const uint8_t *buf, int nb_sectors)
2661 {
2662 int async_ret;
2663 BlockDriverAIOCB *acb;
2664 struct iovec iov;
2665 QEMUIOVector qiov;
2666
2667 async_context_push();
2668
2669 async_ret = NOT_DONE;
2670 iov.iov_base = (void *)buf;
2671 iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2672 qemu_iovec_init_external(&qiov, &iov, 1);
2673 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2674 bdrv_rw_em_cb, &async_ret);
2675 if (acb == NULL) {
2676 async_ret = -1;
2677 goto fail;
2678 }
2679 while (async_ret == NOT_DONE) {
2680 qemu_aio_wait();
2681 }
2682
2683 fail:
2684 async_context_pop();
2685 return async_ret;
2686 }
2687
2688 void bdrv_init(void)
2689 {
2690 module_call_init(MODULE_INIT_BLOCK);
2691 }
2692
2693 void bdrv_init_with_whitelist(void)
2694 {
2695 use_bdrv_whitelist = 1;
2696 bdrv_init();
2697 }
2698
2699 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2700 BlockDriverCompletionFunc *cb, void *opaque)
2701 {
2702 BlockDriverAIOCB *acb;
2703
2704 if (pool->free_aiocb) {
2705 acb = pool->free_aiocb;
2706 pool->free_aiocb = acb->next;
2707 } else {
2708 acb = qemu_mallocz(pool->aiocb_size);
2709 acb->pool = pool;
2710 }
2711 acb->bs = bs;
2712 acb->cb = cb;
2713 acb->opaque = opaque;
2714 return acb;
2715 }
2716
2717 void qemu_aio_release(void *p)
2718 {
2719 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2720 AIOPool *pool = acb->pool;
2721 acb->next = pool->free_aiocb;
2722 pool->free_aiocb = acb;
2723 }
2724
2725 /**************************************************************/
2726 /* removable device support */
2727
2728 /**
2729 * Return TRUE if the media is present
2730 */
2731 int bdrv_is_inserted(BlockDriverState *bs)
2732 {
2733 BlockDriver *drv = bs->drv;
2734 int ret;
2735 if (!drv)
2736 return 0;
2737 if (!drv->bdrv_is_inserted)
2738 return !bs->tray_open;
2739 ret = drv->bdrv_is_inserted(bs);
2740 return ret;
2741 }
2742
2743 /**
2744 * Return TRUE if the media changed since the last call to this
2745 * function. It is currently only used for floppy disks
2746 */
2747 int bdrv_media_changed(BlockDriverState *bs)
2748 {
2749 BlockDriver *drv = bs->drv;
2750 int ret;
2751
2752 if (!drv || !drv->bdrv_media_changed)
2753 ret = -ENOTSUP;
2754 else
2755 ret = drv->bdrv_media_changed(bs);
2756 if (ret == -ENOTSUP)
2757 ret = bs->media_changed;
2758 bs->media_changed = 0;
2759 return ret;
2760 }
2761
2762 /**
2763 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2764 */
2765 int bdrv_eject(BlockDriverState *bs, int eject_flag)
2766 {
2767 BlockDriver *drv = bs->drv;
2768 int ret;
2769
2770 if (bs->locked) {
2771 return -EBUSY;
2772 }
2773
2774 if (!drv || !drv->bdrv_eject) {
2775 ret = -ENOTSUP;
2776 } else {
2777 ret = drv->bdrv_eject(bs, eject_flag);
2778 }
2779 if (ret == -ENOTSUP) {
2780 ret = 0;
2781 }
2782 if (ret >= 0) {
2783 bs->tray_open = eject_flag;
2784 }
2785
2786 return ret;
2787 }
2788
2789 int bdrv_is_locked(BlockDriverState *bs)
2790 {
2791 return bs->locked;
2792 }
2793
2794 /**
2795 * Lock or unlock the media (if it is locked, the user won't be able
2796 * to eject it manually).
2797 */
2798 void bdrv_set_locked(BlockDriverState *bs, int locked)
2799 {
2800 BlockDriver *drv = bs->drv;
2801
2802 bs->locked = locked;
2803 if (drv && drv->bdrv_set_locked) {
2804 drv->bdrv_set_locked(bs, locked);
2805 }
2806 }
2807
2808 /* needed for generic scsi interface */
2809
2810 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2811 {
2812 BlockDriver *drv = bs->drv;
2813
2814 if (drv && drv->bdrv_ioctl)
2815 return drv->bdrv_ioctl(bs, req, buf);
2816 return -ENOTSUP;
2817 }
2818
2819 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2820 unsigned long int req, void *buf,
2821 BlockDriverCompletionFunc *cb, void *opaque)
2822 {
2823 BlockDriver *drv = bs->drv;
2824
2825 if (drv && drv->bdrv_aio_ioctl)
2826 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2827 return NULL;
2828 }
2829
2830
2831
2832 void *qemu_blockalign(BlockDriverState *bs, size_t size)
2833 {
2834 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2835 }
2836
2837 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2838 {
2839 int64_t bitmap_size;
2840
2841 bs->dirty_count = 0;
2842 if (enable) {
2843 if (!bs->dirty_bitmap) {
2844 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2845 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2846 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2847
2848 bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2849 }
2850 } else {
2851 if (bs->dirty_bitmap) {
2852 qemu_free(bs->dirty_bitmap);
2853 bs->dirty_bitmap = NULL;
2854 }
2855 }
2856 }
2857
2858 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2859 {
2860 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2861
2862 if (bs->dirty_bitmap &&
2863 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2864 return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2865 (1UL << (chunk % (sizeof(unsigned long) * 8))));
2866 } else {
2867 return 0;
2868 }
2869 }
2870
2871 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2872 int nr_sectors)
2873 {
2874 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2875 }
2876
2877 int64_t bdrv_get_dirty_count(BlockDriverState *bs)
2878 {
2879 return bs->dirty_count;
2880 }
2881
2882 void bdrv_set_in_use(BlockDriverState *bs, int in_use)
2883 {
2884 assert(bs->in_use != in_use);
2885 bs->in_use = in_use;
2886 }
2887
2888 int bdrv_in_use(BlockDriverState *bs)
2889 {
2890 return bs->in_use;
2891 }
2892
2893 int bdrv_img_create(const char *filename, const char *fmt,
2894 const char *base_filename, const char *base_fmt,
2895 char *options, uint64_t img_size, int flags)
2896 {
2897 QEMUOptionParameter *param = NULL, *create_options = NULL;
2898 QEMUOptionParameter *backing_fmt, *backing_file;
2899 BlockDriverState *bs = NULL;
2900 BlockDriver *drv, *proto_drv;
2901 BlockDriver *backing_drv = NULL;
2902 int ret = 0;
2903
2904 /* Find driver and parse its options */
2905 drv = bdrv_find_format(fmt);
2906 if (!drv) {
2907 error_report("Unknown file format '%s'", fmt);
2908 ret = -EINVAL;
2909 goto out;
2910 }
2911
2912 proto_drv = bdrv_find_protocol(filename);
2913 if (!proto_drv) {
2914 error_report("Unknown protocol '%s'", filename);
2915 ret = -EINVAL;
2916 goto out;
2917 }
2918
2919 create_options = append_option_parameters(create_options,
2920 drv->create_options);
2921 create_options = append_option_parameters(create_options,
2922 proto_drv->create_options);
2923
2924 /* Create parameter list with default values */
2925 param = parse_option_parameters("", create_options, param);
2926
2927 set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
2928
2929 /* Parse -o options */
2930 if (options) {
2931 param = parse_option_parameters(options, create_options, param);
2932 if (param == NULL) {
2933 error_report("Invalid options for file format '%s'.", fmt);
2934 ret = -EINVAL;
2935 goto out;
2936 }
2937 }
2938
2939 if (base_filename) {
2940 if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
2941 base_filename)) {
2942 error_report("Backing file not supported for file format '%s'",
2943 fmt);
2944 ret = -EINVAL;
2945 goto out;
2946 }
2947 }
2948
2949 if (base_fmt) {
2950 if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
2951 error_report("Backing file format not supported for file "
2952 "format '%s'", fmt);
2953 ret = -EINVAL;
2954 goto out;
2955 }
2956 }
2957
2958 backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
2959 if (backing_file && backing_file->value.s) {
2960 if (!strcmp(filename, backing_file->value.s)) {
2961 error_report("Error: Trying to create an image with the "
2962 "same filename as the backing file");
2963 ret = -EINVAL;
2964 goto out;
2965 }
2966 }
2967
2968 backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
2969 if (backing_fmt && backing_fmt->value.s) {
2970 backing_drv = bdrv_find_format(backing_fmt->value.s);
2971 if (!backing_drv) {
2972 error_report("Unknown backing file format '%s'",
2973 backing_fmt->value.s);
2974 ret = -EINVAL;
2975 goto out;
2976 }
2977 }
2978
2979 // The size for the image must always be specified, with one exception:
2980 // If we are using a backing file, we can obtain the size from there
2981 if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
2982 if (backing_file && backing_file->value.s) {
2983 uint64_t size;
2984 char buf[32];
2985
2986 bs = bdrv_new("");
2987
2988 ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
2989 if (ret < 0) {
2990 error_report("Could not open '%s'", backing_file->value.s);
2991 goto out;
2992 }
2993 bdrv_get_geometry(bs, &size);
2994 size *= 512;
2995
2996 snprintf(buf, sizeof(buf), "%" PRId64, size);
2997 set_option_parameter(param, BLOCK_OPT_SIZE, buf);
2998 } else {
2999 error_report("Image creation needs a size parameter");
3000 ret = -EINVAL;
3001 goto out;
3002 }
3003 }
3004
3005 printf("Formatting '%s', fmt=%s ", filename, fmt);
3006 print_option_parameters(param);
3007 puts("");
3008
3009 ret = bdrv_create(drv, filename, param);
3010
3011 if (ret < 0) {
3012 if (ret == -ENOTSUP) {
3013 error_report("Formatting or formatting option not supported for "
3014 "file format '%s'", fmt);
3015 } else if (ret == -EFBIG) {
3016 error_report("The image size is too large for file format '%s'",
3017 fmt);
3018 } else {
3019 error_report("%s: error while creating %s: %s", filename, fmt,
3020 strerror(-ret));
3021 }
3022 }
3023
3024 out:
3025 free_option_parameters(create_options);
3026 free_option_parameters(param);
3027
3028 if (bs) {
3029 bdrv_delete(bs);
3030 }
3031
3032 return ret;
3033 }
QEmu