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1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24#include "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
46static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
47 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
48 BlockDriverCompletionFunc *cb, void *opaque);
49static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
50 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
51 BlockDriverCompletionFunc *cb, void *opaque);
52static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
53 BlockDriverCompletionFunc *cb, void *opaque);
54static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
55 BlockDriverCompletionFunc *cb, void *opaque);
56static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
57 uint8_t *buf, int nb_sectors);
58static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
59 const uint8_t *buf, int nb_sectors);
60
61static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
62 QTAILQ_HEAD_INITIALIZER(bdrv_states);
63
64static QLIST_HEAD(, BlockDriver) bdrv_drivers =
65 QLIST_HEAD_INITIALIZER(bdrv_drivers);
66
67/* The device to use for VM snapshots */
68static BlockDriverState *bs_snapshots;
69
70/* If non-zero, use only whitelisted block drivers */
71static int use_bdrv_whitelist;
72
73#ifdef _WIN32
74static 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
81int 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>:" */
94static 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
106int 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. */
129void 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
170void 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) */
189BlockDriverState *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
201BlockDriver *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
212static 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
230BlockDriver *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
236int 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
245int 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
258void 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
266void 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 */
284static 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
302BlockDriver *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
342static 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 */
394static 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 */
418static 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 writable.
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
492free_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 */
506int 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 */
531int 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
653unlink_and_fail:
654 if (bs->is_temporary) {
655 unlink(filename);
656 }
657 return ret;
658}
659
660void 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
691void bdrv_close_all(void)
692{
693 BlockDriverState *bs;
694
695 QTAILQ_FOREACH(bs, &bdrv_states, list) {
696 bdrv_close(bs);
697 }
698}
699
700/* make a BlockDriverState anonymous by removing from bdrv_state list.
701 Also, NULL terminate the device_name to prevent double remove */
702void bdrv_make_anon(BlockDriverState *bs)
703{
704 if (bs->device_name[0] != '\0') {
705 QTAILQ_REMOVE(&bdrv_states, bs, list);
706 }
707 bs->device_name[0] = '\0';
708}
709
710void bdrv_delete(BlockDriverState *bs)
711{
712 assert(!bs->peer);
713
714 /* remove from list, if necessary */
715 bdrv_make_anon(bs);
716
717 bdrv_close(bs);
718 if (bs->file != NULL) {
719 bdrv_delete(bs->file);
720 }
721
722 assert(bs != bs_snapshots);
723 qemu_free(bs);
724}
725
726int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
727{
728 if (bs->peer) {
729 return -EBUSY;
730 }
731 bs->peer = qdev;
732 return 0;
733}
734
735void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
736{
737 assert(bs->peer == qdev);
738 bs->peer = NULL;
739}
740
741DeviceState *bdrv_get_attached(BlockDriverState *bs)
742{
743 return bs->peer;
744}
745
746/*
747 * Run consistency checks on an image
748 *
749 * Returns 0 if the check could be completed (it doesn't mean that the image is
750 * free of errors) or -errno when an internal error occured. The results of the
751 * check are stored in res.
752 */
753int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
754{
755 if (bs->drv->bdrv_check == NULL) {
756 return -ENOTSUP;
757 }
758
759 memset(res, 0, sizeof(*res));
760 return bs->drv->bdrv_check(bs, res);
761}
762
763#define COMMIT_BUF_SECTORS 2048
764
765/* commit COW file into the raw image */
766int bdrv_commit(BlockDriverState *bs)
767{
768 BlockDriver *drv = bs->drv;
769 BlockDriver *backing_drv;
770 int64_t sector, total_sectors;
771 int n, ro, open_flags;
772 int ret = 0, rw_ret = 0;
773 uint8_t *buf;
774 char filename[1024];
775 BlockDriverState *bs_rw, *bs_ro;
776
777 if (!drv)
778 return -ENOMEDIUM;
779
780 if (!bs->backing_hd) {
781 return -ENOTSUP;
782 }
783
784 if (bs->backing_hd->keep_read_only) {
785 return -EACCES;
786 }
787
788 backing_drv = bs->backing_hd->drv;
789 ro = bs->backing_hd->read_only;
790 strncpy(filename, bs->backing_hd->filename, sizeof(filename));
791 open_flags = bs->backing_hd->open_flags;
792
793 if (ro) {
794 /* re-open as RW */
795 bdrv_delete(bs->backing_hd);
796 bs->backing_hd = NULL;
797 bs_rw = bdrv_new("");
798 rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR,
799 backing_drv);
800 if (rw_ret < 0) {
801 bdrv_delete(bs_rw);
802 /* try to re-open read-only */
803 bs_ro = bdrv_new("");
804 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
805 backing_drv);
806 if (ret < 0) {
807 bdrv_delete(bs_ro);
808 /* drive not functional anymore */
809 bs->drv = NULL;
810 return ret;
811 }
812 bs->backing_hd = bs_ro;
813 return rw_ret;
814 }
815 bs->backing_hd = bs_rw;
816 }
817
818 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
819 buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
820
821 for (sector = 0; sector < total_sectors; sector += n) {
822 if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
823
824 if (bdrv_read(bs, sector, buf, n) != 0) {
825 ret = -EIO;
826 goto ro_cleanup;
827 }
828
829 if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
830 ret = -EIO;
831 goto ro_cleanup;
832 }
833 }
834 }
835
836 if (drv->bdrv_make_empty) {
837 ret = drv->bdrv_make_empty(bs);
838 bdrv_flush(bs);
839 }
840
841 /*
842 * Make sure all data we wrote to the backing device is actually
843 * stable on disk.
844 */
845 if (bs->backing_hd)
846 bdrv_flush(bs->backing_hd);
847
848ro_cleanup:
849 qemu_free(buf);
850
851 if (ro) {
852 /* re-open as RO */
853 bdrv_delete(bs->backing_hd);
854 bs->backing_hd = NULL;
855 bs_ro = bdrv_new("");
856 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR,
857 backing_drv);
858 if (ret < 0) {
859 bdrv_delete(bs_ro);
860 /* drive not functional anymore */
861 bs->drv = NULL;
862 return ret;
863 }
864 bs->backing_hd = bs_ro;
865 bs->backing_hd->keep_read_only = 0;
866 }
867
868 return ret;
869}
870
871void bdrv_commit_all(void)
872{
873 BlockDriverState *bs;
874
875 QTAILQ_FOREACH(bs, &bdrv_states, list) {
876 bdrv_commit(bs);
877 }
878}
879
880/*
881 * Return values:
882 * 0 - success
883 * -EINVAL - backing format specified, but no file
884 * -ENOSPC - can't update the backing file because no space is left in the
885 * image file header
886 * -ENOTSUP - format driver doesn't support changing the backing file
887 */
888int bdrv_change_backing_file(BlockDriverState *bs,
889 const char *backing_file, const char *backing_fmt)
890{
891 BlockDriver *drv = bs->drv;
892
893 if (drv->bdrv_change_backing_file != NULL) {
894 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
895 } else {
896 return -ENOTSUP;
897 }
898}
899
900static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
901 size_t size)
902{
903 int64_t len;
904
905 if (!bdrv_is_inserted(bs))
906 return -ENOMEDIUM;
907
908 if (bs->growable)
909 return 0;
910
911 len = bdrv_getlength(bs);
912
913 if (offset < 0)
914 return -EIO;
915
916 if ((offset > len) || (len - offset < size))
917 return -EIO;
918
919 return 0;
920}
921
922static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
923 int nb_sectors)
924{
925 return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
926 nb_sectors * BDRV_SECTOR_SIZE);
927}
928
929/* return < 0 if error. See bdrv_write() for the return codes */
930int bdrv_read(BlockDriverState *bs, int64_t sector_num,
931 uint8_t *buf, int nb_sectors)
932{
933 BlockDriver *drv = bs->drv;
934
935 if (!drv)
936 return -ENOMEDIUM;
937 if (bdrv_check_request(bs, sector_num, nb_sectors))
938 return -EIO;
939
940 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
941}
942
943static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
944 int nb_sectors, int dirty)
945{
946 int64_t start, end;
947 unsigned long val, idx, bit;
948
949 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
950 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
951
952 for (; start <= end; start++) {
953 idx = start / (sizeof(unsigned long) * 8);
954 bit = start % (sizeof(unsigned long) * 8);
955 val = bs->dirty_bitmap[idx];
956 if (dirty) {
957 if (!(val & (1UL << bit))) {
958 bs->dirty_count++;
959 val |= 1UL << bit;
960 }
961 } else {
962 if (val & (1UL << bit)) {
963 bs->dirty_count--;
964 val &= ~(1UL << bit);
965 }
966 }
967 bs->dirty_bitmap[idx] = val;
968 }
969}
970
971/* Return < 0 if error. Important errors are:
972 -EIO generic I/O error (may happen for all errors)
973 -ENOMEDIUM No media inserted.
974 -EINVAL Invalid sector number or nb_sectors
975 -EACCES Trying to write a read-only device
976*/
977int bdrv_write(BlockDriverState *bs, int64_t sector_num,
978 const uint8_t *buf, int nb_sectors)
979{
980 BlockDriver *drv = bs->drv;
981 if (!bs->drv)
982 return -ENOMEDIUM;
983 if (bs->read_only)
984 return -EACCES;
985 if (bdrv_check_request(bs, sector_num, nb_sectors))
986 return -EIO;
987
988 if (bs->dirty_bitmap) {
989 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
990 }
991
992 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
993 bs->wr_highest_sector = sector_num + nb_sectors - 1;
994 }
995
996 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
997}
998
999int bdrv_pread(BlockDriverState *bs, int64_t offset,
1000 void *buf, int count1)
1001{
1002 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1003 int len, nb_sectors, count;
1004 int64_t sector_num;
1005 int ret;
1006
1007 count = count1;
1008 /* first read to align to sector start */
1009 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1010 if (len > count)
1011 len = count;
1012 sector_num = offset >> BDRV_SECTOR_BITS;
1013 if (len > 0) {
1014 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1015 return ret;
1016 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
1017 count -= len;
1018 if (count == 0)
1019 return count1;
1020 sector_num++;
1021 buf += len;
1022 }
1023
1024 /* read the sectors "in place" */
1025 nb_sectors = count >> BDRV_SECTOR_BITS;
1026 if (nb_sectors > 0) {
1027 if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
1028 return ret;
1029 sector_num += nb_sectors;
1030 len = nb_sectors << BDRV_SECTOR_BITS;
1031 buf += len;
1032 count -= len;
1033 }
1034
1035 /* add data from the last sector */
1036 if (count > 0) {
1037 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1038 return ret;
1039 memcpy(buf, tmp_buf, count);
1040 }
1041 return count1;
1042}
1043
1044int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
1045 const void *buf, int count1)
1046{
1047 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
1048 int len, nb_sectors, count;
1049 int64_t sector_num;
1050 int ret;
1051
1052 count = count1;
1053 /* first write to align to sector start */
1054 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
1055 if (len > count)
1056 len = count;
1057 sector_num = offset >> BDRV_SECTOR_BITS;
1058 if (len > 0) {
1059 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1060 return ret;
1061 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
1062 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1063 return ret;
1064 count -= len;
1065 if (count == 0)
1066 return count1;
1067 sector_num++;
1068 buf += len;
1069 }
1070
1071 /* write the sectors "in place" */
1072 nb_sectors = count >> BDRV_SECTOR_BITS;
1073 if (nb_sectors > 0) {
1074 if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
1075 return ret;
1076 sector_num += nb_sectors;
1077 len = nb_sectors << BDRV_SECTOR_BITS;
1078 buf += len;
1079 count -= len;
1080 }
1081
1082 /* add data from the last sector */
1083 if (count > 0) {
1084 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
1085 return ret;
1086 memcpy(tmp_buf, buf, count);
1087 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
1088 return ret;
1089 }
1090 return count1;
1091}
1092
1093/*
1094 * Writes to the file and ensures that no writes are reordered across this
1095 * request (acts as a barrier)
1096 *
1097 * Returns 0 on success, -errno in error cases.
1098 */
1099int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
1100 const void *buf, int count)
1101{
1102 int ret;
1103
1104 ret = bdrv_pwrite(bs, offset, buf, count);
1105 if (ret < 0) {
1106 return ret;
1107 }
1108
1109 /* No flush needed for cache=writethrough, it uses O_DSYNC */
1110 if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) {
1111 bdrv_flush(bs);
1112 }
1113
1114 return 0;
1115}
1116
1117/*
1118 * Writes to the file and ensures that no writes are reordered across this
1119 * request (acts as a barrier)
1120 *
1121 * Returns 0 on success, -errno in error cases.
1122 */
1123int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
1124 const uint8_t *buf, int nb_sectors)
1125{
1126 return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
1127 buf, BDRV_SECTOR_SIZE * nb_sectors);
1128}
1129
1130/**
1131 * Truncate file to 'offset' bytes (needed only for file protocols)
1132 */
1133int bdrv_truncate(BlockDriverState *bs, int64_t offset)
1134{
1135 BlockDriver *drv = bs->drv;
1136 int ret;
1137 if (!drv)
1138 return -ENOMEDIUM;
1139 if (!drv->bdrv_truncate)
1140 return -ENOTSUP;
1141 if (bs->read_only)
1142 return -EACCES;
1143 if (bdrv_in_use(bs))
1144 return -EBUSY;
1145 ret = drv->bdrv_truncate(bs, offset);
1146 if (ret == 0) {
1147 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1148 if (bs->change_cb) {
1149 bs->change_cb(bs->change_opaque, CHANGE_SIZE);
1150 }
1151 }
1152 return ret;
1153}
1154
1155/**
1156 * Length of a file in bytes. Return < 0 if error or unknown.
1157 */
1158int64_t bdrv_getlength(BlockDriverState *bs)
1159{
1160 BlockDriver *drv = bs->drv;
1161 if (!drv)
1162 return -ENOMEDIUM;
1163
1164 if (bs->growable || bs->removable) {
1165 if (drv->bdrv_getlength) {
1166 return drv->bdrv_getlength(bs);
1167 }
1168 }
1169 return bs->total_sectors * BDRV_SECTOR_SIZE;
1170}
1171
1172/* return 0 as number of sectors if no device present or error */
1173void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1174{
1175 int64_t length;
1176 length = bdrv_getlength(bs);
1177 if (length < 0)
1178 length = 0;
1179 else
1180 length = length >> BDRV_SECTOR_BITS;
1181 *nb_sectors_ptr = length;
1182}
1183
1184struct partition {
1185 uint8_t boot_ind; /* 0x80 - active */
1186 uint8_t head; /* starting head */
1187 uint8_t sector; /* starting sector */
1188 uint8_t cyl; /* starting cylinder */
1189 uint8_t sys_ind; /* What partition type */
1190 uint8_t end_head; /* end head */
1191 uint8_t end_sector; /* end sector */
1192 uint8_t end_cyl; /* end cylinder */
1193 uint32_t start_sect; /* starting sector counting from 0 */
1194 uint32_t nr_sects; /* nr of sectors in partition */
1195} __attribute__((packed));
1196
1197/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1198static int guess_disk_lchs(BlockDriverState *bs,
1199 int *pcylinders, int *pheads, int *psectors)
1200{
1201 uint8_t buf[BDRV_SECTOR_SIZE];
1202 int ret, i, heads, sectors, cylinders;
1203 struct partition *p;
1204 uint32_t nr_sects;
1205 uint64_t nb_sectors;
1206
1207 bdrv_get_geometry(bs, &nb_sectors);
1208
1209 ret = bdrv_read(bs, 0, buf, 1);
1210 if (ret < 0)
1211 return -1;
1212 /* test msdos magic */
1213 if (buf[510] != 0x55 || buf[511] != 0xaa)
1214 return -1;
1215 for(i = 0; i < 4; i++) {
1216 p = ((struct partition *)(buf + 0x1be)) + i;
1217 nr_sects = le32_to_cpu(p->nr_sects);
1218 if (nr_sects && p->end_head) {
1219 /* We make the assumption that the partition terminates on
1220 a cylinder boundary */
1221 heads = p->end_head + 1;
1222 sectors = p->end_sector & 63;
1223 if (sectors == 0)
1224 continue;
1225 cylinders = nb_sectors / (heads * sectors);
1226 if (cylinders < 1 || cylinders > 16383)
1227 continue;
1228 *pheads = heads;
1229 *psectors = sectors;
1230 *pcylinders = cylinders;
1231#if 0
1232 printf("guessed geometry: LCHS=%d %d %d\n",
1233 cylinders, heads, sectors);
1234#endif
1235 return 0;
1236 }
1237 }
1238 return -1;
1239}
1240
1241void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1242{
1243 int translation, lba_detected = 0;
1244 int cylinders, heads, secs;
1245 uint64_t nb_sectors;
1246
1247 /* if a geometry hint is available, use it */
1248 bdrv_get_geometry(bs, &nb_sectors);
1249 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1250 translation = bdrv_get_translation_hint(bs);
1251 if (cylinders != 0) {
1252 *pcyls = cylinders;
1253 *pheads = heads;
1254 *psecs = secs;
1255 } else {
1256 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1257 if (heads > 16) {
1258 /* if heads > 16, it means that a BIOS LBA
1259 translation was active, so the default
1260 hardware geometry is OK */
1261 lba_detected = 1;
1262 goto default_geometry;
1263 } else {
1264 *pcyls = cylinders;
1265 *pheads = heads;
1266 *psecs = secs;
1267 /* disable any translation to be in sync with
1268 the logical geometry */
1269 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1270 bdrv_set_translation_hint(bs,
1271 BIOS_ATA_TRANSLATION_NONE);
1272 }
1273 }
1274 } else {
1275 default_geometry:
1276 /* if no geometry, use a standard physical disk geometry */
1277 cylinders = nb_sectors / (16 * 63);
1278
1279 if (cylinders > 16383)
1280 cylinders = 16383;
1281 else if (cylinders < 2)
1282 cylinders = 2;
1283 *pcyls = cylinders;
1284 *pheads = 16;
1285 *psecs = 63;
1286 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1287 if ((*pcyls * *pheads) <= 131072) {
1288 bdrv_set_translation_hint(bs,
1289 BIOS_ATA_TRANSLATION_LARGE);
1290 } else {
1291 bdrv_set_translation_hint(bs,
1292 BIOS_ATA_TRANSLATION_LBA);
1293 }
1294 }
1295 }
1296 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1297 }
1298}
1299
1300void bdrv_set_geometry_hint(BlockDriverState *bs,
1301 int cyls, int heads, int secs)
1302{
1303 bs->cyls = cyls;
1304 bs->heads = heads;
1305 bs->secs = secs;
1306}
1307
1308void bdrv_set_type_hint(BlockDriverState *bs, int type)
1309{
1310 bs->type = type;
1311 bs->removable = ((type == BDRV_TYPE_CDROM ||
1312 type == BDRV_TYPE_FLOPPY));
1313}
1314
1315void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1316{
1317 bs->translation = translation;
1318}
1319
1320void bdrv_get_geometry_hint(BlockDriverState *bs,
1321 int *pcyls, int *pheads, int *psecs)
1322{
1323 *pcyls = bs->cyls;
1324 *pheads = bs->heads;
1325 *psecs = bs->secs;
1326}
1327
1328/* Recognize floppy formats */
1329typedef struct FDFormat {
1330 FDriveType drive;
1331 uint8_t last_sect;
1332 uint8_t max_track;
1333 uint8_t max_head;
1334} FDFormat;
1335
1336static const FDFormat fd_formats[] = {
1337 /* First entry is default format */
1338 /* 1.44 MB 3"1/2 floppy disks */
1339 { FDRIVE_DRV_144, 18, 80, 1, },
1340 { FDRIVE_DRV_144, 20, 80, 1, },
1341 { FDRIVE_DRV_144, 21, 80, 1, },
1342 { FDRIVE_DRV_144, 21, 82, 1, },
1343 { FDRIVE_DRV_144, 21, 83, 1, },
1344 { FDRIVE_DRV_144, 22, 80, 1, },
1345 { FDRIVE_DRV_144, 23, 80, 1, },
1346 { FDRIVE_DRV_144, 24, 80, 1, },
1347 /* 2.88 MB 3"1/2 floppy disks */
1348 { FDRIVE_DRV_288, 36, 80, 1, },
1349 { FDRIVE_DRV_288, 39, 80, 1, },
1350 { FDRIVE_DRV_288, 40, 80, 1, },
1351 { FDRIVE_DRV_288, 44, 80, 1, },
1352 { FDRIVE_DRV_288, 48, 80, 1, },
1353 /* 720 kB 3"1/2 floppy disks */
1354 { FDRIVE_DRV_144, 9, 80, 1, },
1355 { FDRIVE_DRV_144, 10, 80, 1, },
1356 { FDRIVE_DRV_144, 10, 82, 1, },
1357 { FDRIVE_DRV_144, 10, 83, 1, },
1358 { FDRIVE_DRV_144, 13, 80, 1, },
1359 { FDRIVE_DRV_144, 14, 80, 1, },
1360 /* 1.2 MB 5"1/4 floppy disks */
1361 { FDRIVE_DRV_120, 15, 80, 1, },
1362 { FDRIVE_DRV_120, 18, 80, 1, },
1363 { FDRIVE_DRV_120, 18, 82, 1, },
1364 { FDRIVE_DRV_120, 18, 83, 1, },
1365 { FDRIVE_DRV_120, 20, 80, 1, },
1366 /* 720 kB 5"1/4 floppy disks */
1367 { FDRIVE_DRV_120, 9, 80, 1, },
1368 { FDRIVE_DRV_120, 11, 80, 1, },
1369 /* 360 kB 5"1/4 floppy disks */
1370 { FDRIVE_DRV_120, 9, 40, 1, },
1371 { FDRIVE_DRV_120, 9, 40, 0, },
1372 { FDRIVE_DRV_120, 10, 41, 1, },
1373 { FDRIVE_DRV_120, 10, 42, 1, },
1374 /* 320 kB 5"1/4 floppy disks */
1375 { FDRIVE_DRV_120, 8, 40, 1, },
1376 { FDRIVE_DRV_120, 8, 40, 0, },
1377 /* 360 kB must match 5"1/4 better than 3"1/2... */
1378 { FDRIVE_DRV_144, 9, 80, 0, },
1379 /* end */
1380 { FDRIVE_DRV_NONE, -1, -1, 0, },
1381};
1382
1383void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
1384 int *max_track, int *last_sect,
1385 FDriveType drive_in, FDriveType *drive)
1386{
1387 const FDFormat *parse;
1388 uint64_t nb_sectors, size;
1389 int i, first_match, match;
1390
1391 bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect);
1392 if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) {
1393 /* User defined disk */
1394 } else {
1395 bdrv_get_geometry(bs, &nb_sectors);
1396 match = -1;
1397 first_match = -1;
1398 for (i = 0; ; i++) {
1399 parse = &fd_formats[i];
1400 if (parse->drive == FDRIVE_DRV_NONE) {
1401 break;
1402 }
1403 if (drive_in == parse->drive ||
1404 drive_in == FDRIVE_DRV_NONE) {
1405 size = (parse->max_head + 1) * parse->max_track *
1406 parse->last_sect;
1407 if (nb_sectors == size) {
1408 match = i;
1409 break;
1410 }
1411 if (first_match == -1) {
1412 first_match = i;
1413 }
1414 }
1415 }
1416 if (match == -1) {
1417 if (first_match == -1) {
1418 match = 1;
1419 } else {
1420 match = first_match;
1421 }
1422 parse = &fd_formats[match];
1423 }
1424 *nb_heads = parse->max_head + 1;
1425 *max_track = parse->max_track;
1426 *last_sect = parse->last_sect;
1427 *drive = parse->drive;
1428 }
1429}
1430
1431int bdrv_get_type_hint(BlockDriverState *bs)
1432{
1433 return bs->type;
1434}
1435
1436int bdrv_get_translation_hint(BlockDriverState *bs)
1437{
1438 return bs->translation;
1439}
1440
1441void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
1442 BlockErrorAction on_write_error)
1443{
1444 bs->on_read_error = on_read_error;
1445 bs->on_write_error = on_write_error;
1446}
1447
1448BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
1449{
1450 return is_read ? bs->on_read_error : bs->on_write_error;
1451}
1452
1453void bdrv_set_removable(BlockDriverState *bs, int removable)
1454{
1455 bs->removable = removable;
1456 if (removable && bs == bs_snapshots) {
1457 bs_snapshots = NULL;
1458 }
1459}
1460
1461int bdrv_is_removable(BlockDriverState *bs)
1462{
1463 return bs->removable;
1464}
1465
1466int bdrv_is_read_only(BlockDriverState *bs)
1467{
1468 return bs->read_only;
1469}
1470
1471int bdrv_is_sg(BlockDriverState *bs)
1472{
1473 return bs->sg;
1474}
1475
1476int bdrv_enable_write_cache(BlockDriverState *bs)
1477{
1478 return bs->enable_write_cache;
1479}
1480
1481/* XXX: no longer used */
1482void bdrv_set_change_cb(BlockDriverState *bs,
1483 void (*change_cb)(void *opaque, int reason),
1484 void *opaque)
1485{
1486 bs->change_cb = change_cb;
1487 bs->change_opaque = opaque;
1488}
1489
1490int bdrv_is_encrypted(BlockDriverState *bs)
1491{
1492 if (bs->backing_hd && bs->backing_hd->encrypted)
1493 return 1;
1494 return bs->encrypted;
1495}
1496
1497int bdrv_key_required(BlockDriverState *bs)
1498{
1499 BlockDriverState *backing_hd = bs->backing_hd;
1500
1501 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1502 return 1;
1503 return (bs->encrypted && !bs->valid_key);
1504}
1505
1506int bdrv_set_key(BlockDriverState *bs, const char *key)
1507{
1508 int ret;
1509 if (bs->backing_hd && bs->backing_hd->encrypted) {
1510 ret = bdrv_set_key(bs->backing_hd, key);
1511 if (ret < 0)
1512 return ret;
1513 if (!bs->encrypted)
1514 return 0;
1515 }
1516 if (!bs->encrypted) {
1517 return -EINVAL;
1518 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
1519 return -ENOMEDIUM;
1520 }
1521 ret = bs->drv->bdrv_set_key(bs, key);
1522 if (ret < 0) {
1523 bs->valid_key = 0;
1524 } else if (!bs->valid_key) {
1525 bs->valid_key = 1;
1526 /* call the change callback now, we skipped it on open */
1527 bs->media_changed = 1;
1528 if (bs->change_cb)
1529 bs->change_cb(bs->change_opaque, CHANGE_MEDIA);
1530 }
1531 return ret;
1532}
1533
1534void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1535{
1536 if (!bs->drv) {
1537 buf[0] = '\0';
1538 } else {
1539 pstrcpy(buf, buf_size, bs->drv->format_name);
1540 }
1541}
1542
1543void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1544 void *opaque)
1545{
1546 BlockDriver *drv;
1547
1548 QLIST_FOREACH(drv, &bdrv_drivers, list) {
1549 it(opaque, drv->format_name);
1550 }
1551}
1552
1553BlockDriverState *bdrv_find(const char *name)
1554{
1555 BlockDriverState *bs;
1556
1557 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1558 if (!strcmp(name, bs->device_name)) {
1559 return bs;
1560 }
1561 }
1562 return NULL;
1563}
1564
1565BlockDriverState *bdrv_next(BlockDriverState *bs)
1566{
1567 if (!bs) {
1568 return QTAILQ_FIRST(&bdrv_states);
1569 }
1570 return QTAILQ_NEXT(bs, list);
1571}
1572
1573void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1574{
1575 BlockDriverState *bs;
1576
1577 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1578 it(opaque, bs);
1579 }
1580}
1581
1582const char *bdrv_get_device_name(BlockDriverState *bs)
1583{
1584 return bs->device_name;
1585}
1586
1587int bdrv_flush(BlockDriverState *bs)
1588{
1589 if (bs->open_flags & BDRV_O_NO_FLUSH) {
1590 return 0;
1591 }
1592
1593 if (bs->drv && bs->drv->bdrv_flush) {
1594 return bs->drv->bdrv_flush(bs);
1595 }
1596
1597 /*
1598 * Some block drivers always operate in either writethrough or unsafe mode
1599 * and don't support bdrv_flush therefore. Usually qemu doesn't know how
1600 * the server works (because the behaviour is hardcoded or depends on
1601 * server-side configuration), so we can't ensure that everything is safe
1602 * on disk. Returning an error doesn't work because that would break guests
1603 * even if the server operates in writethrough mode.
1604 *
1605 * Let's hope the user knows what he's doing.
1606 */
1607 return 0;
1608}
1609
1610void bdrv_flush_all(void)
1611{
1612 BlockDriverState *bs;
1613
1614 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1615 if (bs->drv && !bdrv_is_read_only(bs) &&
1616 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1617 bdrv_flush(bs);
1618 }
1619 }
1620}
1621
1622int bdrv_has_zero_init(BlockDriverState *bs)
1623{
1624 assert(bs->drv);
1625
1626 if (bs->drv->bdrv_has_zero_init) {
1627 return bs->drv->bdrv_has_zero_init(bs);
1628 }
1629
1630 return 1;
1631}
1632
1633int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
1634{
1635 if (!bs->drv) {
1636 return -ENOMEDIUM;
1637 }
1638 if (!bs->drv->bdrv_discard) {
1639 return 0;
1640 }
1641 return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
1642}
1643
1644/*
1645 * Returns true iff the specified sector is present in the disk image. Drivers
1646 * not implementing the functionality are assumed to not support backing files,
1647 * hence all their sectors are reported as allocated.
1648 *
1649 * 'pnum' is set to the number of sectors (including and immediately following
1650 * the specified sector) that are known to be in the same
1651 * allocated/unallocated state.
1652 *
1653 * 'nb_sectors' is the max value 'pnum' should be set to.
1654 */
1655int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1656 int *pnum)
1657{
1658 int64_t n;
1659 if (!bs->drv->bdrv_is_allocated) {
1660 if (sector_num >= bs->total_sectors) {
1661 *pnum = 0;
1662 return 0;
1663 }
1664 n = bs->total_sectors - sector_num;
1665 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1666 return 1;
1667 }
1668 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1669}
1670
1671void bdrv_mon_event(const BlockDriverState *bdrv,
1672 BlockMonEventAction action, int is_read)
1673{
1674 QObject *data;
1675 const char *action_str;
1676
1677 switch (action) {
1678 case BDRV_ACTION_REPORT:
1679 action_str = "report";
1680 break;
1681 case BDRV_ACTION_IGNORE:
1682 action_str = "ignore";
1683 break;
1684 case BDRV_ACTION_STOP:
1685 action_str = "stop";
1686 break;
1687 default:
1688 abort();
1689 }
1690
1691 data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1692 bdrv->device_name,
1693 action_str,
1694 is_read ? "read" : "write");
1695 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
1696
1697 qobject_decref(data);
1698}
1699
1700static void bdrv_print_dict(QObject *obj, void *opaque)
1701{
1702 QDict *bs_dict;
1703 Monitor *mon = opaque;
1704
1705 bs_dict = qobject_to_qdict(obj);
1706
1707 monitor_printf(mon, "%s: type=%s removable=%d",
1708 qdict_get_str(bs_dict, "device"),
1709 qdict_get_str(bs_dict, "type"),
1710 qdict_get_bool(bs_dict, "removable"));
1711
1712 if (qdict_get_bool(bs_dict, "removable")) {
1713 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1714 }
1715
1716 if (qdict_haskey(bs_dict, "inserted")) {
1717 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1718
1719 monitor_printf(mon, " file=");
1720 monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1721 if (qdict_haskey(qdict, "backing_file")) {
1722 monitor_printf(mon, " backing_file=");
1723 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1724 }
1725 monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1726 qdict_get_bool(qdict, "ro"),
1727 qdict_get_str(qdict, "drv"),
1728 qdict_get_bool(qdict, "encrypted"));
1729 } else {
1730 monitor_printf(mon, " [not inserted]");
1731 }
1732
1733 monitor_printf(mon, "\n");
1734}
1735
1736void bdrv_info_print(Monitor *mon, const QObject *data)
1737{
1738 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1739}
1740
1741void bdrv_info(Monitor *mon, QObject **ret_data)
1742{
1743 QList *bs_list;
1744 BlockDriverState *bs;
1745
1746 bs_list = qlist_new();
1747
1748 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1749 QObject *bs_obj;
1750 const char *type = "unknown";
1751
1752 switch(bs->type) {
1753 case BDRV_TYPE_HD:
1754 type = "hd";
1755 break;
1756 case BDRV_TYPE_CDROM:
1757 type = "cdrom";
1758 break;
1759 case BDRV_TYPE_FLOPPY:
1760 type = "floppy";
1761 break;
1762 }
1763
1764 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1765 "'removable': %i, 'locked': %i }",
1766 bs->device_name, type, bs->removable,
1767 bs->locked);
1768
1769 if (bs->drv) {
1770 QObject *obj;
1771 QDict *bs_dict = qobject_to_qdict(bs_obj);
1772
1773 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1774 "'encrypted': %i }",
1775 bs->filename, bs->read_only,
1776 bs->drv->format_name,
1777 bdrv_is_encrypted(bs));
1778 if (bs->backing_file[0] != '\0') {
1779 QDict *qdict = qobject_to_qdict(obj);
1780 qdict_put(qdict, "backing_file",
1781 qstring_from_str(bs->backing_file));
1782 }
1783
1784 qdict_put_obj(bs_dict, "inserted", obj);
1785 }
1786 qlist_append_obj(bs_list, bs_obj);
1787 }
1788
1789 *ret_data = QOBJECT(bs_list);
1790}
1791
1792static void bdrv_stats_iter(QObject *data, void *opaque)
1793{
1794 QDict *qdict;
1795 Monitor *mon = opaque;
1796
1797 qdict = qobject_to_qdict(data);
1798 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1799
1800 qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1801 monitor_printf(mon, " rd_bytes=%" PRId64
1802 " wr_bytes=%" PRId64
1803 " rd_operations=%" PRId64
1804 " wr_operations=%" PRId64
1805 "\n",
1806 qdict_get_int(qdict, "rd_bytes"),
1807 qdict_get_int(qdict, "wr_bytes"),
1808 qdict_get_int(qdict, "rd_operations"),
1809 qdict_get_int(qdict, "wr_operations"));
1810}
1811
1812void bdrv_stats_print(Monitor *mon, const QObject *data)
1813{
1814 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1815}
1816
1817static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
1818{
1819 QObject *res;
1820 QDict *dict;
1821
1822 res = qobject_from_jsonf("{ 'stats': {"
1823 "'rd_bytes': %" PRId64 ","
1824 "'wr_bytes': %" PRId64 ","
1825 "'rd_operations': %" PRId64 ","
1826 "'wr_operations': %" PRId64 ","
1827 "'wr_highest_offset': %" PRId64
1828 "} }",
1829 bs->rd_bytes, bs->wr_bytes,
1830 bs->rd_ops, bs->wr_ops,
1831 bs->wr_highest_sector *
1832 (uint64_t)BDRV_SECTOR_SIZE);
1833 dict = qobject_to_qdict(res);
1834
1835 if (*bs->device_name) {
1836 qdict_put(dict, "device", qstring_from_str(bs->device_name));
1837 }
1838
1839 if (bs->file) {
1840 QObject *parent = bdrv_info_stats_bs(bs->file);
1841 qdict_put_obj(dict, "parent", parent);
1842 }
1843
1844 return res;
1845}
1846
1847void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1848{
1849 QObject *obj;
1850 QList *devices;
1851 BlockDriverState *bs;
1852
1853 devices = qlist_new();
1854
1855 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1856 obj = bdrv_info_stats_bs(bs);
1857 qlist_append_obj(devices, obj);
1858 }
1859
1860 *ret_data = QOBJECT(devices);
1861}
1862
1863const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1864{
1865 if (bs->backing_hd && bs->backing_hd->encrypted)
1866 return bs->backing_file;
1867 else if (bs->encrypted)
1868 return bs->filename;
1869 else
1870 return NULL;
1871}
1872
1873void bdrv_get_backing_filename(BlockDriverState *bs,
1874 char *filename, int filename_size)
1875{
1876 if (!bs->backing_file) {
1877 pstrcpy(filename, filename_size, "");
1878 } else {
1879 pstrcpy(filename, filename_size, bs->backing_file);
1880 }
1881}
1882
1883int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1884 const uint8_t *buf, int nb_sectors)
1885{
1886 BlockDriver *drv = bs->drv;
1887 if (!drv)
1888 return -ENOMEDIUM;
1889 if (!drv->bdrv_write_compressed)
1890 return -ENOTSUP;
1891 if (bdrv_check_request(bs, sector_num, nb_sectors))
1892 return -EIO;
1893
1894 if (bs->dirty_bitmap) {
1895 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1896 }
1897
1898 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1899}
1900
1901int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1902{
1903 BlockDriver *drv = bs->drv;
1904 if (!drv)
1905 return -ENOMEDIUM;
1906 if (!drv->bdrv_get_info)
1907 return -ENOTSUP;
1908 memset(bdi, 0, sizeof(*bdi));
1909 return drv->bdrv_get_info(bs, bdi);
1910}
1911
1912int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1913 int64_t pos, int size)
1914{
1915 BlockDriver *drv = bs->drv;
1916 if (!drv)
1917 return -ENOMEDIUM;
1918 if (drv->bdrv_save_vmstate)
1919 return drv->bdrv_save_vmstate(bs, buf, pos, size);
1920 if (bs->file)
1921 return bdrv_save_vmstate(bs->file, buf, pos, size);
1922 return -ENOTSUP;
1923}
1924
1925int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1926 int64_t pos, int size)
1927{
1928 BlockDriver *drv = bs->drv;
1929 if (!drv)
1930 return -ENOMEDIUM;
1931 if (drv->bdrv_load_vmstate)
1932 return drv->bdrv_load_vmstate(bs, buf, pos, size);
1933 if (bs->file)
1934 return bdrv_load_vmstate(bs->file, buf, pos, size);
1935 return -ENOTSUP;
1936}
1937
1938void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
1939{
1940 BlockDriver *drv = bs->drv;
1941
1942 if (!drv || !drv->bdrv_debug_event) {
1943 return;
1944 }
1945
1946 return drv->bdrv_debug_event(bs, event);
1947
1948}
1949
1950/**************************************************************/
1951/* handling of snapshots */
1952
1953int bdrv_can_snapshot(BlockDriverState *bs)
1954{
1955 BlockDriver *drv = bs->drv;
1956 if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1957 return 0;
1958 }
1959
1960 if (!drv->bdrv_snapshot_create) {
1961 if (bs->file != NULL) {
1962 return bdrv_can_snapshot(bs->file);
1963 }
1964 return 0;
1965 }
1966
1967 return 1;
1968}
1969
1970int bdrv_is_snapshot(BlockDriverState *bs)
1971{
1972 return !!(bs->open_flags & BDRV_O_SNAPSHOT);
1973}
1974
1975BlockDriverState *bdrv_snapshots(void)
1976{
1977 BlockDriverState *bs;
1978
1979 if (bs_snapshots) {
1980 return bs_snapshots;
1981 }
1982
1983 bs = NULL;
1984 while ((bs = bdrv_next(bs))) {
1985 if (bdrv_can_snapshot(bs)) {
1986 bs_snapshots = bs;
1987 return bs;
1988 }
1989 }
1990 return NULL;
1991}
1992
1993int bdrv_snapshot_create(BlockDriverState *bs,
1994 QEMUSnapshotInfo *sn_info)
1995{
1996 BlockDriver *drv = bs->drv;
1997 if (!drv)
1998 return -ENOMEDIUM;
1999 if (drv->bdrv_snapshot_create)
2000 return drv->bdrv_snapshot_create(bs, sn_info);
2001 if (bs->file)
2002 return bdrv_snapshot_create(bs->file, sn_info);
2003 return -ENOTSUP;
2004}
2005
2006int bdrv_snapshot_goto(BlockDriverState *bs,
2007 const char *snapshot_id)
2008{
2009 BlockDriver *drv = bs->drv;
2010 int ret, open_ret;
2011
2012 if (!drv)
2013 return -ENOMEDIUM;
2014 if (drv->bdrv_snapshot_goto)
2015 return drv->bdrv_snapshot_goto(bs, snapshot_id);
2016
2017 if (bs->file) {
2018 drv->bdrv_close(bs);
2019 ret = bdrv_snapshot_goto(bs->file, snapshot_id);
2020 open_ret = drv->bdrv_open(bs, bs->open_flags);
2021 if (open_ret < 0) {
2022 bdrv_delete(bs->file);
2023 bs->drv = NULL;
2024 return open_ret;
2025 }
2026 return ret;
2027 }
2028
2029 return -ENOTSUP;
2030}
2031
2032int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
2033{
2034 BlockDriver *drv = bs->drv;
2035 if (!drv)
2036 return -ENOMEDIUM;
2037 if (drv->bdrv_snapshot_delete)
2038 return drv->bdrv_snapshot_delete(bs, snapshot_id);
2039 if (bs->file)
2040 return bdrv_snapshot_delete(bs->file, snapshot_id);
2041 return -ENOTSUP;
2042}
2043
2044int bdrv_snapshot_list(BlockDriverState *bs,
2045 QEMUSnapshotInfo **psn_info)
2046{
2047 BlockDriver *drv = bs->drv;
2048 if (!drv)
2049 return -ENOMEDIUM;
2050 if (drv->bdrv_snapshot_list)
2051 return drv->bdrv_snapshot_list(bs, psn_info);
2052 if (bs->file)
2053 return bdrv_snapshot_list(bs->file, psn_info);
2054 return -ENOTSUP;
2055}
2056
2057int bdrv_snapshot_load_tmp(BlockDriverState *bs,
2058 const char *snapshot_name)
2059{
2060 BlockDriver *drv = bs->drv;
2061 if (!drv) {
2062 return -ENOMEDIUM;
2063 }
2064 if (!bs->read_only) {
2065 return -EINVAL;
2066 }
2067 if (drv->bdrv_snapshot_load_tmp) {
2068 return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
2069 }
2070 return -ENOTSUP;
2071}
2072
2073#define NB_SUFFIXES 4
2074
2075char *get_human_readable_size(char *buf, int buf_size, int64_t size)
2076{
2077 static const char suffixes[NB_SUFFIXES] = "KMGT";
2078 int64_t base;
2079 int i;
2080
2081 if (size <= 999) {
2082 snprintf(buf, buf_size, "%" PRId64, size);
2083 } else {
2084 base = 1024;
2085 for(i = 0; i < NB_SUFFIXES; i++) {
2086 if (size < (10 * base)) {
2087 snprintf(buf, buf_size, "%0.1f%c",
2088 (double)size / base,
2089 suffixes[i]);
2090 break;
2091 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
2092 snprintf(buf, buf_size, "%" PRId64 "%c",
2093 ((size + (base >> 1)) / base),
2094 suffixes[i]);
2095 break;
2096 }
2097 base = base * 1024;
2098 }
2099 }
2100 return buf;
2101}
2102
2103char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
2104{
2105 char buf1[128], date_buf[128], clock_buf[128];
2106#ifdef _WIN32
2107 struct tm *ptm;
2108#else
2109 struct tm tm;
2110#endif
2111 time_t ti;
2112 int64_t secs;
2113
2114 if (!sn) {
2115 snprintf(buf, buf_size,
2116 "%-10s%-20s%7s%20s%15s",
2117 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2118 } else {
2119 ti = sn->date_sec;
2120#ifdef _WIN32
2121 ptm = localtime(&ti);
2122 strftime(date_buf, sizeof(date_buf),
2123 "%Y-%m-%d %H:%M:%S", ptm);
2124#else
2125 localtime_r(&ti, &tm);
2126 strftime(date_buf, sizeof(date_buf),
2127 "%Y-%m-%d %H:%M:%S", &tm);
2128#endif
2129 secs = sn->vm_clock_nsec / 1000000000;
2130 snprintf(clock_buf, sizeof(clock_buf),
2131 "%02d:%02d:%02d.%03d",
2132 (int)(secs / 3600),
2133 (int)((secs / 60) % 60),
2134 (int)(secs % 60),
2135 (int)((sn->vm_clock_nsec / 1000000) % 1000));
2136 snprintf(buf, buf_size,
2137 "%-10s%-20s%7s%20s%15s",
2138 sn->id_str, sn->name,
2139 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
2140 date_buf,
2141 clock_buf);
2142 }
2143 return buf;
2144}
2145
2146
2147/**************************************************************/
2148/* async I/Os */
2149
2150BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
2151 QEMUIOVector *qiov, int nb_sectors,
2152 BlockDriverCompletionFunc *cb, void *opaque)
2153{
2154 BlockDriver *drv = bs->drv;
2155 BlockDriverAIOCB *ret;
2156
2157 trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
2158
2159 if (!drv)
2160 return NULL;
2161 if (bdrv_check_request(bs, sector_num, nb_sectors))
2162 return NULL;
2163
2164 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
2165 cb, opaque);
2166
2167 if (ret) {
2168 /* Update stats even though technically transfer has not happened. */
2169 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
2170 bs->rd_ops ++;
2171 }
2172
2173 return ret;
2174}
2175
2176typedef struct BlockCompleteData {
2177 BlockDriverCompletionFunc *cb;
2178 void *opaque;
2179 BlockDriverState *bs;
2180 int64_t sector_num;
2181 int nb_sectors;
2182} BlockCompleteData;
2183
2184static void block_complete_cb(void *opaque, int ret)
2185{
2186 BlockCompleteData *b = opaque;
2187
2188 if (b->bs->dirty_bitmap) {
2189 set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
2190 }
2191 b->cb(b->opaque, ret);
2192 qemu_free(b);
2193}
2194
2195static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
2196 int64_t sector_num,
2197 int nb_sectors,
2198 BlockDriverCompletionFunc *cb,
2199 void *opaque)
2200{
2201 BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
2202
2203 blkdata->bs = bs;
2204 blkdata->cb = cb;
2205 blkdata->opaque = opaque;
2206 blkdata->sector_num = sector_num;
2207 blkdata->nb_sectors = nb_sectors;
2208
2209 return blkdata;
2210}
2211
2212BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
2213 QEMUIOVector *qiov, int nb_sectors,
2214 BlockDriverCompletionFunc *cb, void *opaque)
2215{
2216 BlockDriver *drv = bs->drv;
2217 BlockDriverAIOCB *ret;
2218 BlockCompleteData *blk_cb_data;
2219
2220 trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
2221
2222 if (!drv)
2223 return NULL;
2224 if (bs->read_only)
2225 return NULL;
2226 if (bdrv_check_request(bs, sector_num, nb_sectors))
2227 return NULL;
2228
2229 if (bs->dirty_bitmap) {
2230 blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
2231 opaque);
2232 cb = &block_complete_cb;
2233 opaque = blk_cb_data;
2234 }
2235
2236 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
2237 cb, opaque);
2238
2239 if (ret) {
2240 /* Update stats even though technically transfer has not happened. */
2241 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
2242 bs->wr_ops ++;
2243 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
2244 bs->wr_highest_sector = sector_num + nb_sectors - 1;
2245 }
2246 }
2247
2248 return ret;
2249}
2250
2251
2252typedef struct MultiwriteCB {
2253 int error;
2254 int num_requests;
2255 int num_callbacks;
2256 struct {
2257 BlockDriverCompletionFunc *cb;
2258 void *opaque;
2259 QEMUIOVector *free_qiov;
2260 void *free_buf;
2261 } callbacks[];
2262} MultiwriteCB;
2263
2264static void multiwrite_user_cb(MultiwriteCB *mcb)
2265{
2266 int i;
2267
2268 for (i = 0; i < mcb->num_callbacks; i++) {
2269 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
2270 if (mcb->callbacks[i].free_qiov) {
2271 qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
2272 }
2273 qemu_free(mcb->callbacks[i].free_qiov);
2274 qemu_vfree(mcb->callbacks[i].free_buf);
2275 }
2276}
2277
2278static void multiwrite_cb(void *opaque, int ret)
2279{
2280 MultiwriteCB *mcb = opaque;
2281
2282 trace_multiwrite_cb(mcb, ret);
2283
2284 if (ret < 0 && !mcb->error) {
2285 mcb->error = ret;
2286 }
2287
2288 mcb->num_requests--;
2289 if (mcb->num_requests == 0) {
2290 multiwrite_user_cb(mcb);
2291 qemu_free(mcb);
2292 }
2293}
2294
2295static int multiwrite_req_compare(const void *a, const void *b)
2296{
2297 const BlockRequest *req1 = a, *req2 = b;
2298
2299 /*
2300 * Note that we can't simply subtract req2->sector from req1->sector
2301 * here as that could overflow the return value.
2302 */
2303 if (req1->sector > req2->sector) {
2304 return 1;
2305 } else if (req1->sector < req2->sector) {
2306 return -1;
2307 } else {
2308 return 0;
2309 }
2310}
2311
2312/*
2313 * Takes a bunch of requests and tries to merge them. Returns the number of
2314 * requests that remain after merging.
2315 */
2316static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
2317 int num_reqs, MultiwriteCB *mcb)
2318{
2319 int i, outidx;
2320
2321 // Sort requests by start sector
2322 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
2323
2324 // Check if adjacent requests touch the same clusters. If so, combine them,
2325 // filling up gaps with zero sectors.
2326 outidx = 0;
2327 for (i = 1; i < num_reqs; i++) {
2328 int merge = 0;
2329 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
2330
2331 // This handles the cases that are valid for all block drivers, namely
2332 // exactly sequential writes and overlapping writes.
2333 if (reqs[i].sector <= oldreq_last) {
2334 merge = 1;
2335 }
2336
2337 // The block driver may decide that it makes sense to combine requests
2338 // even if there is a gap of some sectors between them. In this case,
2339 // the gap is filled with zeros (therefore only applicable for yet
2340 // unused space in format like qcow2).
2341 if (!merge && bs->drv->bdrv_merge_requests) {
2342 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
2343 }
2344
2345 if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
2346 merge = 0;
2347 }
2348
2349 if (merge) {
2350 size_t size;
2351 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
2352 qemu_iovec_init(qiov,
2353 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
2354
2355 // Add the first request to the merged one. If the requests are
2356 // overlapping, drop the last sectors of the first request.
2357 size = (reqs[i].sector - reqs[outidx].sector) << 9;
2358 qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
2359
2360 // We might need to add some zeros between the two requests
2361 if (reqs[i].sector > oldreq_last) {
2362 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
2363 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
2364 memset(buf, 0, zero_bytes);
2365 qemu_iovec_add(qiov, buf, zero_bytes);
2366 mcb->callbacks[i].free_buf = buf;
2367 }
2368
2369 // Add the second request
2370 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
2371
2372 reqs[outidx].nb_sectors = qiov->size >> 9;
2373 reqs[outidx].qiov = qiov;
2374
2375 mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
2376 } else {
2377 outidx++;
2378 reqs[outidx].sector = reqs[i].sector;
2379 reqs[outidx].nb_sectors = reqs[i].nb_sectors;
2380 reqs[outidx].qiov = reqs[i].qiov;
2381 }
2382 }
2383
2384 return outidx + 1;
2385}
2386
2387/*
2388 * Submit multiple AIO write requests at once.
2389 *
2390 * On success, the function returns 0 and all requests in the reqs array have
2391 * been submitted. In error case this function returns -1, and any of the
2392 * requests may or may not be submitted yet. In particular, this means that the
2393 * callback will be called for some of the requests, for others it won't. The
2394 * caller must check the error field of the BlockRequest to wait for the right
2395 * callbacks (if error != 0, no callback will be called).
2396 *
2397 * The implementation may modify the contents of the reqs array, e.g. to merge
2398 * requests. However, the fields opaque and error are left unmodified as they
2399 * are used to signal failure for a single request to the caller.
2400 */
2401int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
2402{
2403 BlockDriverAIOCB *acb;
2404 MultiwriteCB *mcb;
2405 int i;
2406
2407 /* don't submit writes if we don't have a medium */
2408 if (bs->drv == NULL) {
2409 for (i = 0; i < num_reqs; i++) {
2410 reqs[i].error = -ENOMEDIUM;
2411 }
2412 return -1;
2413 }
2414
2415 if (num_reqs == 0) {
2416 return 0;
2417 }
2418
2419 // Create MultiwriteCB structure
2420 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
2421 mcb->num_requests = 0;
2422 mcb->num_callbacks = num_reqs;
2423
2424 for (i = 0; i < num_reqs; i++) {
2425 mcb->callbacks[i].cb = reqs[i].cb;
2426 mcb->callbacks[i].opaque = reqs[i].opaque;
2427 }
2428
2429 // Check for mergable requests
2430 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2431
2432 trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
2433
2434 /*
2435 * Run the aio requests. As soon as one request can't be submitted
2436 * successfully, fail all requests that are not yet submitted (we must
2437 * return failure for all requests anyway)
2438 *
2439 * num_requests cannot be set to the right value immediately: If
2440 * bdrv_aio_writev fails for some request, num_requests would be too high
2441 * and therefore multiwrite_cb() would never recognize the multiwrite
2442 * request as completed. We also cannot use the loop variable i to set it
2443 * when the first request fails because the callback may already have been
2444 * called for previously submitted requests. Thus, num_requests must be
2445 * incremented for each request that is submitted.
2446 *
2447 * The problem that callbacks may be called early also means that we need
2448 * to take care that num_requests doesn't become 0 before all requests are
2449 * submitted - multiwrite_cb() would consider the multiwrite request
2450 * completed. A dummy request that is "completed" by a manual call to
2451 * multiwrite_cb() takes care of this.
2452 */
2453 mcb->num_requests = 1;
2454
2455 // Run the aio requests
2456 for (i = 0; i < num_reqs; i++) {
2457 mcb->num_requests++;
2458 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2459 reqs[i].nb_sectors, multiwrite_cb, mcb);
2460
2461 if (acb == NULL) {
2462 // We can only fail the whole thing if no request has been
2463 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2464 // complete and report the error in the callback.
2465 if (i == 0) {
2466 trace_bdrv_aio_multiwrite_earlyfail(mcb);
2467 goto fail;
2468 } else {
2469 trace_bdrv_aio_multiwrite_latefail(mcb, i);
2470 multiwrite_cb(mcb, -EIO);
2471 break;
2472 }
2473 }
2474 }
2475
2476 /* Complete the dummy request */
2477 multiwrite_cb(mcb, 0);
2478
2479 return 0;
2480
2481fail:
2482 for (i = 0; i < mcb->num_callbacks; i++) {
2483 reqs[i].error = -EIO;
2484 }
2485 qemu_free(mcb);
2486 return -1;
2487}
2488
2489BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2490 BlockDriverCompletionFunc *cb, void *opaque)
2491{
2492 BlockDriver *drv = bs->drv;
2493
2494 trace_bdrv_aio_flush(bs, opaque);
2495
2496 if (bs->open_flags & BDRV_O_NO_FLUSH) {
2497 return bdrv_aio_noop_em(bs, cb, opaque);
2498 }
2499
2500 if (!drv)
2501 return NULL;
2502 return drv->bdrv_aio_flush(bs, cb, opaque);
2503}
2504
2505void bdrv_aio_cancel(BlockDriverAIOCB *acb)
2506{
2507 acb->pool->cancel(acb);
2508}
2509
2510
2511/**************************************************************/
2512/* async block device emulation */
2513
2514typedef struct BlockDriverAIOCBSync {
2515 BlockDriverAIOCB common;
2516 QEMUBH *bh;
2517 int ret;
2518 /* vector translation state */
2519 QEMUIOVector *qiov;
2520 uint8_t *bounce;
2521 int is_write;
2522} BlockDriverAIOCBSync;
2523
2524static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2525{
2526 BlockDriverAIOCBSync *acb =
2527 container_of(blockacb, BlockDriverAIOCBSync, common);
2528 qemu_bh_delete(acb->bh);
2529 acb->bh = NULL;
2530 qemu_aio_release(acb);
2531}
2532
2533static AIOPool bdrv_em_aio_pool = {
2534 .aiocb_size = sizeof(BlockDriverAIOCBSync),
2535 .cancel = bdrv_aio_cancel_em,
2536};
2537
2538static void bdrv_aio_bh_cb(void *opaque)
2539{
2540 BlockDriverAIOCBSync *acb = opaque;
2541
2542 if (!acb->is_write)
2543 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2544 qemu_vfree(acb->bounce);
2545 acb->common.cb(acb->common.opaque, acb->ret);
2546 qemu_bh_delete(acb->bh);
2547 acb->bh = NULL;
2548 qemu_aio_release(acb);
2549}
2550
2551static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2552 int64_t sector_num,
2553 QEMUIOVector *qiov,
2554 int nb_sectors,
2555 BlockDriverCompletionFunc *cb,
2556 void *opaque,
2557 int is_write)
2558
2559{
2560 BlockDriverAIOCBSync *acb;
2561
2562 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2563 acb->is_write = is_write;
2564 acb->qiov = qiov;
2565 acb->bounce = qemu_blockalign(bs, qiov->size);
2566
2567 if (!acb->bh)
2568 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2569
2570 if (is_write) {
2571 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2572 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2573 } else {
2574 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2575 }
2576
2577 qemu_bh_schedule(acb->bh);
2578
2579 return &acb->common;
2580}
2581
2582static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2583 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2584 BlockDriverCompletionFunc *cb, void *opaque)
2585{
2586 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
2587}
2588
2589static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2590 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2591 BlockDriverCompletionFunc *cb, void *opaque)
2592{
2593 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
2594}
2595
2596static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2597 BlockDriverCompletionFunc *cb, void *opaque)
2598{
2599 BlockDriverAIOCBSync *acb;
2600
2601 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2602 acb->is_write = 1; /* don't bounce in the completion hadler */
2603 acb->qiov = NULL;
2604 acb->bounce = NULL;
2605 acb->ret = 0;
2606
2607 if (!acb->bh)
2608 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2609
2610 bdrv_flush(bs);
2611 qemu_bh_schedule(acb->bh);
2612 return &acb->common;
2613}
2614
2615static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
2616 BlockDriverCompletionFunc *cb, void *opaque)
2617{
2618 BlockDriverAIOCBSync *acb;
2619
2620 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2621 acb->is_write = 1; /* don't bounce in the completion handler */
2622 acb->qiov = NULL;
2623 acb->bounce = NULL;
2624 acb->ret = 0;
2625
2626 if (!acb->bh) {
2627 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2628 }
2629
2630 qemu_bh_schedule(acb->bh);
2631 return &acb->common;
2632}
2633
2634/**************************************************************/
2635/* sync block device emulation */
2636
2637static void bdrv_rw_em_cb(void *opaque, int ret)
2638{
2639 *(int *)opaque = ret;
2640}
2641
2642#define NOT_DONE 0x7fffffff
2643
2644static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
2645 uint8_t *buf, int nb_sectors)
2646{
2647 int async_ret;
2648 BlockDriverAIOCB *acb;
2649 struct iovec iov;
2650 QEMUIOVector qiov;
2651
2652 async_context_push();
2653
2654 async_ret = NOT_DONE;
2655 iov.iov_base = (void *)buf;
2656 iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2657 qemu_iovec_init_external(&qiov, &iov, 1);
2658 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2659 bdrv_rw_em_cb, &async_ret);
2660 if (acb == NULL) {
2661 async_ret = -1;
2662 goto fail;
2663 }
2664
2665 while (async_ret == NOT_DONE) {
2666 qemu_aio_wait();
2667 }
2668
2669
2670fail:
2671 async_context_pop();
2672 return async_ret;
2673}
2674
2675static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2676 const uint8_t *buf, int nb_sectors)
2677{
2678 int async_ret;
2679 BlockDriverAIOCB *acb;
2680 struct iovec iov;
2681 QEMUIOVector qiov;
2682
2683 async_context_push();
2684
2685 async_ret = NOT_DONE;
2686 iov.iov_base = (void *)buf;
2687 iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
2688 qemu_iovec_init_external(&qiov, &iov, 1);
2689 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2690 bdrv_rw_em_cb, &async_ret);
2691 if (acb == NULL) {
2692 async_ret = -1;
2693 goto fail;
2694 }
2695 while (async_ret == NOT_DONE) {
2696 qemu_aio_wait();
2697 }
2698
2699fail:
2700 async_context_pop();
2701 return async_ret;
2702}
2703
2704void bdrv_init(void)
2705{
2706 module_call_init(MODULE_INIT_BLOCK);
2707}
2708
2709void bdrv_init_with_whitelist(void)
2710{
2711 use_bdrv_whitelist = 1;
2712 bdrv_init();
2713}
2714
2715void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2716 BlockDriverCompletionFunc *cb, void *opaque)
2717{
2718 BlockDriverAIOCB *acb;
2719
2720 if (pool->free_aiocb) {
2721 acb = pool->free_aiocb;
2722 pool->free_aiocb = acb->next;
2723 } else {
2724 acb = qemu_mallocz(pool->aiocb_size);
2725 acb->pool = pool;
2726 }
2727 acb->bs = bs;
2728 acb->cb = cb;
2729 acb->opaque = opaque;
2730 return acb;
2731}
2732
2733void qemu_aio_release(void *p)
2734{
2735 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2736 AIOPool *pool = acb->pool;
2737 acb->next = pool->free_aiocb;
2738 pool->free_aiocb = acb;
2739}
2740
2741/**************************************************************/
2742/* removable device support */
2743
2744/**
2745 * Return TRUE if the media is present
2746 */
2747int bdrv_is_inserted(BlockDriverState *bs)
2748{
2749 BlockDriver *drv = bs->drv;
2750 int ret;
2751 if (!drv)
2752 return 0;
2753 if (!drv->bdrv_is_inserted)
2754 return !bs->tray_open;
2755 ret = drv->bdrv_is_inserted(bs);
2756 return ret;
2757}
2758
2759/**
2760 * Return TRUE if the media changed since the last call to this
2761 * function. It is currently only used for floppy disks
2762 */
2763int bdrv_media_changed(BlockDriverState *bs)
2764{
2765 BlockDriver *drv = bs->drv;
2766 int ret;
2767
2768 if (!drv || !drv->bdrv_media_changed)
2769 ret = -ENOTSUP;
2770 else
2771 ret = drv->bdrv_media_changed(bs);
2772 if (ret == -ENOTSUP)
2773 ret = bs->media_changed;
2774 bs->media_changed = 0;
2775 return ret;
2776}
2777
2778/**
2779 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2780 */
2781int bdrv_eject(BlockDriverState *bs, int eject_flag)
2782{
2783 BlockDriver *drv = bs->drv;
2784 int ret;
2785
2786 if (bs->locked) {
2787 return -EBUSY;
2788 }
2789
2790 if (!drv || !drv->bdrv_eject) {
2791 ret = -ENOTSUP;
2792 } else {
2793 ret = drv->bdrv_eject(bs, eject_flag);
2794 }
2795 if (ret == -ENOTSUP) {
2796 ret = 0;
2797 }
2798 if (ret >= 0) {
2799 bs->tray_open = eject_flag;
2800 }
2801
2802 return ret;
2803}
2804
2805int bdrv_is_locked(BlockDriverState *bs)
2806{
2807 return bs->locked;
2808}
2809
2810/**
2811 * Lock or unlock the media (if it is locked, the user won't be able
2812 * to eject it manually).
2813 */
2814void bdrv_set_locked(BlockDriverState *bs, int locked)
2815{
2816 BlockDriver *drv = bs->drv;
2817
2818 trace_bdrv_set_locked(bs, locked);
2819
2820 bs->locked = locked;
2821 if (drv && drv->bdrv_set_locked) {
2822 drv->bdrv_set_locked(bs, locked);
2823 }
2824}
2825
2826/* needed for generic scsi interface */
2827
2828int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2829{
2830 BlockDriver *drv = bs->drv;
2831
2832 if (drv && drv->bdrv_ioctl)
2833 return drv->bdrv_ioctl(bs, req, buf);
2834 return -ENOTSUP;
2835}
2836
2837BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2838 unsigned long int req, void *buf,
2839 BlockDriverCompletionFunc *cb, void *opaque)
2840{
2841 BlockDriver *drv = bs->drv;
2842
2843 if (drv && drv->bdrv_aio_ioctl)
2844 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2845 return NULL;
2846}
2847
2848
2849
2850void *qemu_blockalign(BlockDriverState *bs, size_t size)
2851{
2852 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2853}
2854
2855void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2856{
2857 int64_t bitmap_size;
2858
2859 bs->dirty_count = 0;
2860 if (enable) {
2861 if (!bs->dirty_bitmap) {
2862 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2863 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2864 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2865
2866 bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2867 }
2868 } else {
2869 if (bs->dirty_bitmap) {
2870 qemu_free(bs->dirty_bitmap);
2871 bs->dirty_bitmap = NULL;
2872 }
2873 }
2874}
2875
2876int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2877{
2878 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2879
2880 if (bs->dirty_bitmap &&
2881 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2882 return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2883 (1UL << (chunk % (sizeof(unsigned long) * 8))));
2884 } else {
2885 return 0;
2886 }
2887}
2888
2889void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2890 int nr_sectors)
2891{
2892 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2893}
2894
2895int64_t bdrv_get_dirty_count(BlockDriverState *bs)
2896{
2897 return bs->dirty_count;
2898}
2899
2900void bdrv_set_in_use(BlockDriverState *bs, int in_use)
2901{
2902 assert(bs->in_use != in_use);
2903 bs->in_use = in_use;
2904}
2905
2906int bdrv_in_use(BlockDriverState *bs)
2907{
2908 return bs->in_use;
2909}
2910
2911int bdrv_img_create(const char *filename, const char *fmt,
2912 const char *base_filename, const char *base_fmt,
2913 char *options, uint64_t img_size, int flags)
2914{
2915 QEMUOptionParameter *param = NULL, *create_options = NULL;
2916 QEMUOptionParameter *backing_fmt, *backing_file;
2917 BlockDriverState *bs = NULL;
2918 BlockDriver *drv, *proto_drv;
2919 BlockDriver *backing_drv = NULL;
2920 int ret = 0;
2921
2922 /* Find driver and parse its options */
2923 drv = bdrv_find_format(fmt);
2924 if (!drv) {
2925 error_report("Unknown file format '%s'", fmt);
2926 ret = -EINVAL;
2927 goto out;
2928 }
2929
2930 proto_drv = bdrv_find_protocol(filename);
2931 if (!proto_drv) {
2932 error_report("Unknown protocol '%s'", filename);
2933 ret = -EINVAL;
2934 goto out;
2935 }
2936
2937 create_options = append_option_parameters(create_options,
2938 drv->create_options);
2939 create_options = append_option_parameters(create_options,
2940 proto_drv->create_options);
2941
2942 /* Create parameter list with default values */
2943 param = parse_option_parameters("", create_options, param);
2944
2945 set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
2946
2947 /* Parse -o options */
2948 if (options) {
2949 param = parse_option_parameters(options, create_options, param);
2950 if (param == NULL) {
2951 error_report("Invalid options for file format '%s'.", fmt);
2952 ret = -EINVAL;
2953 goto out;
2954 }
2955 }
2956
2957 if (base_filename) {
2958 if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
2959 base_filename)) {
2960 error_report("Backing file not supported for file format '%s'",
2961 fmt);
2962 ret = -EINVAL;
2963 goto out;
2964 }
2965 }
2966
2967 if (base_fmt) {
2968 if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
2969 error_report("Backing file format not supported for file "
2970 "format '%s'", fmt);
2971 ret = -EINVAL;
2972 goto out;
2973 }
2974 }
2975
2976 backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
2977 if (backing_file && backing_file->value.s) {
2978 if (!strcmp(filename, backing_file->value.s)) {
2979 error_report("Error: Trying to create an image with the "
2980 "same filename as the backing file");
2981 ret = -EINVAL;
2982 goto out;
2983 }
2984 }
2985
2986 backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
2987 if (backing_fmt && backing_fmt->value.s) {
2988 backing_drv = bdrv_find_format(backing_fmt->value.s);
2989 if (!backing_drv) {
2990 error_report("Unknown backing file format '%s'",
2991 backing_fmt->value.s);
2992 ret = -EINVAL;
2993 goto out;
2994 }
2995 }
2996
2997 // The size for the image must always be specified, with one exception:
2998 // If we are using a backing file, we can obtain the size from there
2999 if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
3000 if (backing_file && backing_file->value.s) {
3001 uint64_t size;
3002 char buf[32];
3003
3004 bs = bdrv_new("");
3005
3006 ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv);
3007 if (ret < 0) {
3008 error_report("Could not open '%s'", backing_file->value.s);
3009 goto out;
3010 }
3011 bdrv_get_geometry(bs, &size);
3012 size *= 512;
3013
3014 snprintf(buf, sizeof(buf), "%" PRId64, size);
3015 set_option_parameter(param, BLOCK_OPT_SIZE, buf);
3016 } else {
3017 error_report("Image creation needs a size parameter");
3018 ret = -EINVAL;
3019 goto out;
3020 }
3021 }
3022
3023 printf("Formatting '%s', fmt=%s ", filename, fmt);
3024 print_option_parameters(param);
3025 puts("");
3026
3027 ret = bdrv_create(drv, filename, param);
3028
3029 if (ret < 0) {
3030 if (ret == -ENOTSUP) {
3031 error_report("Formatting or formatting option not supported for "
3032 "file format '%s'", fmt);
3033 } else if (ret == -EFBIG) {
3034 error_report("The image size is too large for file format '%s'",
3035 fmt);
3036 } else {
3037 error_report("%s: error while creating %s: %s", filename, fmt,
3038 strerror(-ret));
3039 }
3040 }
3041
3042out:
3043 free_option_parameters(create_options);
3044 free_option_parameters(param);
3045
3046 if (bs) {
3047 bdrv_delete(bs);
3048 }
3049
3050 return ret;
3051}
Qemu copy for testing