2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include "block_int.h"
28 #include <sys/types.h>
30 #include <sys/ioctl.h>
31 #include <sys/queue.h>
36 #define SECTOR_SIZE (1 << SECTOR_BITS)
38 typedef struct BlockDriverAIOCBSync {
39 BlockDriverAIOCB common;
42 } BlockDriverAIOCBSync;
44 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
45 int64_t sector_num, uint8_t *buf, int nb_sectors,
46 BlockDriverCompletionFunc *cb, void *opaque);
47 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
48 int64_t sector_num, const uint8_t *buf, int nb_sectors,
49 BlockDriverCompletionFunc *cb, void *opaque);
50 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
51 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
52 uint8_t *buf, int nb_sectors);
53 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
54 const uint8_t *buf, int nb_sectors);
56 static BlockDriverState *bdrv_first;
57 static BlockDriver *first_drv;
65 int path_is_absolute(const char *path)
68 p = strchr(path, ':');
73 return (*p == PATH_SEP);
76 /* if filename is absolute, just copy it to dest. Otherwise, build a
77 path to it by considering it is relative to base_path. URL are
79 void path_combine(char *dest, int dest_size,
80 const char *base_path,
88 if (path_is_absolute(filename)) {
89 pstrcpy(dest, dest_size, filename);
91 p = strchr(base_path, ':');
96 p1 = strrchr(base_path, PATH_SEP);
104 if (len > dest_size - 1)
106 memcpy(dest, base_path, len);
108 pstrcat(dest, dest_size, filename);
113 void bdrv_register(BlockDriver *bdrv)
115 if (!bdrv->bdrv_aio_read) {
116 /* add AIO emulation layer */
117 bdrv->bdrv_aio_read = bdrv_aio_read_em;
118 bdrv->bdrv_aio_write = bdrv_aio_write_em;
119 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
120 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
121 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
122 /* add synchronous IO emulation layer */
123 bdrv->bdrv_read = bdrv_read_em;
124 bdrv->bdrv_write = bdrv_write_em;
126 bdrv->next = first_drv;
130 /* create a new block device (by default it is empty) */
131 BlockDriverState *bdrv_new(const char *device_name)
133 BlockDriverState **pbs, *bs;
135 bs = qemu_mallocz(sizeof(BlockDriverState));
138 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
139 if (device_name[0] != '\0') {
140 /* insert at the end */
149 BlockDriver *bdrv_find_format(const char *format_name)
152 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
153 if (!strcmp(drv1->format_name, format_name))
159 int bdrv_create(BlockDriver *drv,
160 const char *filename, int64_t size_in_sectors,
161 const char *backing_file, int flags)
163 if (!drv->bdrv_create)
165 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
169 void get_tmp_filename(char *filename, int size)
174 void get_tmp_filename(char *filename, int size)
177 /* XXX: race condition possible */
178 pstrcpy(filename, size, "/tmp/vl.XXXXXX");
179 fd = mkstemp(filename);
185 static int is_windows_drive_prefix(const char *filename)
187 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
188 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
192 static int is_windows_drive(const char *filename)
194 if (is_windows_drive_prefix(filename) &&
197 if (strstart(filename, "\\\\.\\", NULL) ||
198 strstart(filename, "//./", NULL))
204 static BlockDriver *find_protocol(const char *filename)
212 if (is_windows_drive(filename) ||
213 is_windows_drive_prefix(filename))
216 p = strchr(filename, ':');
220 if (len > sizeof(protocol) - 1)
221 len = sizeof(protocol) - 1;
222 memcpy(protocol, filename, len);
223 protocol[len] = '\0';
224 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
225 if (drv1->protocol_name &&
226 !strcmp(drv1->protocol_name, protocol))
232 /* XXX: force raw format if block or character device ? It would
233 simplify the BSD case */
234 static BlockDriver *find_image_format(const char *filename)
236 int ret, score, score_max;
237 BlockDriver *drv1, *drv;
239 BlockDriverState *bs;
241 /* detect host devices. By convention, /dev/cdrom[N] is always
242 recognized as a host CDROM */
243 if (strstart(filename, "/dev/cdrom", NULL))
244 return &bdrv_host_device;
246 if (is_windows_drive(filename))
247 return &bdrv_host_device;
251 if (stat(filename, &st) >= 0 &&
252 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
253 return &bdrv_host_device;
258 drv = find_protocol(filename);
259 /* no need to test disk image formats for vvfat */
260 if (drv == &bdrv_vvfat)
263 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
266 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
273 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
274 if (drv1->bdrv_probe) {
275 score = drv1->bdrv_probe(buf, ret, filename);
276 if (score > score_max) {
285 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
287 BlockDriverState *bs;
293 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
302 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
304 return bdrv_open2(bs, filename, flags, NULL);
307 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
311 char tmp_filename[1024];
312 char backing_filename[1024];
315 bs->is_temporary = 0;
318 if (flags & BDRV_O_SNAPSHOT) {
319 BlockDriverState *bs1;
322 /* if snapshot, we create a temporary backing file and open it
323 instead of opening 'filename' directly */
325 /* if there is a backing file, use it */
330 if (bdrv_open(bs1, filename, 0) < 0) {
334 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
337 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
338 if (bdrv_create(&bdrv_qcow2, tmp_filename,
339 total_size, filename, 0) < 0) {
342 filename = tmp_filename;
343 bs->is_temporary = 1;
346 pstrcpy(bs->filename, sizeof(bs->filename), filename);
347 if (flags & BDRV_O_FILE) {
348 drv = find_protocol(filename);
353 drv = find_image_format(filename);
359 bs->opaque = qemu_mallocz(drv->instance_size);
360 if (bs->opaque == NULL && drv->instance_size > 0)
362 /* Note: for compatibility, we open disk image files as RDWR, and
363 RDONLY as fallback */
364 if (!(flags & BDRV_O_FILE))
365 open_flags = BDRV_O_RDWR;
367 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
368 ret = drv->bdrv_open(bs, filename, open_flags);
369 if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
370 ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
374 qemu_free(bs->opaque);
379 if (drv->bdrv_getlength) {
380 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
383 if (bs->is_temporary) {
387 if (bs->backing_file[0] != '\0') {
388 /* if there is a backing file, use it */
389 bs->backing_hd = bdrv_new("");
390 if (!bs->backing_hd) {
395 path_combine(backing_filename, sizeof(backing_filename),
396 filename, bs->backing_file);
397 if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
401 /* call the change callback */
402 bs->media_changed = 1;
404 bs->change_cb(bs->change_opaque);
409 void bdrv_close(BlockDriverState *bs)
413 bdrv_delete(bs->backing_hd);
414 bs->drv->bdrv_close(bs);
415 qemu_free(bs->opaque);
417 if (bs->is_temporary) {
418 unlink(bs->filename);
424 /* call the change callback */
425 bs->media_changed = 1;
427 bs->change_cb(bs->change_opaque);
431 void bdrv_delete(BlockDriverState *bs)
433 /* XXX: remove the driver list */
438 /* commit COW file into the raw image */
439 int bdrv_commit(BlockDriverState *bs)
441 BlockDriver *drv = bs->drv;
442 int64_t i, total_sectors;
444 unsigned char sector[512];
453 if (!bs->backing_hd) {
457 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
458 for (i = 0; i < total_sectors;) {
459 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
460 for(j = 0; j < n; j++) {
461 if (bdrv_read(bs, i, sector, 1) != 0) {
465 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
475 if (drv->bdrv_make_empty)
476 return drv->bdrv_make_empty(bs);
481 /* return < 0 if error. See bdrv_write() for the return codes */
482 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
483 uint8_t *buf, int nb_sectors)
485 BlockDriver *drv = bs->drv;
490 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
491 memcpy(buf, bs->boot_sector_data, 512);
498 if (drv->bdrv_pread) {
500 len = nb_sectors * 512;
501 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
509 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
513 /* Return < 0 if error. Important errors are:
514 -EIO generic I/O error (may happen for all errors)
515 -ENOMEDIUM No media inserted.
516 -EINVAL Invalid sector number or nb_sectors
517 -EACCES Trying to write a read-only device
519 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
520 const uint8_t *buf, int nb_sectors)
522 BlockDriver *drv = bs->drv;
527 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
528 memcpy(bs->boot_sector_data, buf, 512);
530 if (drv->bdrv_pwrite) {
532 len = nb_sectors * 512;
533 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
541 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
545 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
546 uint8_t *buf, int count1)
548 uint8_t tmp_buf[SECTOR_SIZE];
549 int len, nb_sectors, count;
553 /* first read to align to sector start */
554 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
557 sector_num = offset >> SECTOR_BITS;
559 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
561 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
569 /* read the sectors "in place" */
570 nb_sectors = count >> SECTOR_BITS;
571 if (nb_sectors > 0) {
572 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
574 sector_num += nb_sectors;
575 len = nb_sectors << SECTOR_BITS;
580 /* add data from the last sector */
582 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
584 memcpy(buf, tmp_buf, count);
589 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
590 const uint8_t *buf, int count1)
592 uint8_t tmp_buf[SECTOR_SIZE];
593 int len, nb_sectors, count;
597 /* first write to align to sector start */
598 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
601 sector_num = offset >> SECTOR_BITS;
603 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
605 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
606 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
615 /* write the sectors "in place" */
616 nb_sectors = count >> SECTOR_BITS;
617 if (nb_sectors > 0) {
618 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
620 sector_num += nb_sectors;
621 len = nb_sectors << SECTOR_BITS;
626 /* add data from the last sector */
628 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
630 memcpy(tmp_buf, buf, count);
631 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
638 * Read with byte offsets (needed only for file protocols)
640 int bdrv_pread(BlockDriverState *bs, int64_t offset,
641 void *buf1, int count1)
643 BlockDriver *drv = bs->drv;
647 if (!drv->bdrv_pread)
648 return bdrv_pread_em(bs, offset, buf1, count1);
649 return drv->bdrv_pread(bs, offset, buf1, count1);
653 * Write with byte offsets (needed only for file protocols)
655 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
656 const void *buf1, int count1)
658 BlockDriver *drv = bs->drv;
662 if (!drv->bdrv_pwrite)
663 return bdrv_pwrite_em(bs, offset, buf1, count1);
664 return drv->bdrv_pwrite(bs, offset, buf1, count1);
668 * Truncate file to 'offset' bytes (needed only for file protocols)
670 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
672 BlockDriver *drv = bs->drv;
675 if (!drv->bdrv_truncate)
677 return drv->bdrv_truncate(bs, offset);
681 * Length of a file in bytes. Return < 0 if error or unknown.
683 int64_t bdrv_getlength(BlockDriverState *bs)
685 BlockDriver *drv = bs->drv;
688 if (!drv->bdrv_getlength) {
690 return bs->total_sectors * SECTOR_SIZE;
692 return drv->bdrv_getlength(bs);
695 /* return 0 as number of sectors if no device present or error */
696 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
699 length = bdrv_getlength(bs);
703 length = length >> SECTOR_BITS;
704 *nb_sectors_ptr = length;
707 /* force a given boot sector. */
708 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
710 bs->boot_sector_enabled = 1;
713 memcpy(bs->boot_sector_data, data, size);
714 memset(bs->boot_sector_data + size, 0, 512 - size);
717 void bdrv_set_geometry_hint(BlockDriverState *bs,
718 int cyls, int heads, int secs)
725 void bdrv_set_type_hint(BlockDriverState *bs, int type)
728 bs->removable = ((type == BDRV_TYPE_CDROM ||
729 type == BDRV_TYPE_FLOPPY));
732 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
734 bs->translation = translation;
737 void bdrv_get_geometry_hint(BlockDriverState *bs,
738 int *pcyls, int *pheads, int *psecs)
745 int bdrv_get_type_hint(BlockDriverState *bs)
750 int bdrv_get_translation_hint(BlockDriverState *bs)
752 return bs->translation;
755 int bdrv_is_removable(BlockDriverState *bs)
757 return bs->removable;
760 int bdrv_is_read_only(BlockDriverState *bs)
762 return bs->read_only;
765 /* XXX: no longer used */
766 void bdrv_set_change_cb(BlockDriverState *bs,
767 void (*change_cb)(void *opaque), void *opaque)
769 bs->change_cb = change_cb;
770 bs->change_opaque = opaque;
773 int bdrv_is_encrypted(BlockDriverState *bs)
775 if (bs->backing_hd && bs->backing_hd->encrypted)
777 return bs->encrypted;
780 int bdrv_set_key(BlockDriverState *bs, const char *key)
783 if (bs->backing_hd && bs->backing_hd->encrypted) {
784 ret = bdrv_set_key(bs->backing_hd, key);
790 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
792 return bs->drv->bdrv_set_key(bs, key);
795 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
800 pstrcpy(buf, buf_size, bs->drv->format_name);
804 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
809 for (drv = first_drv; drv != NULL; drv = drv->next) {
810 it(opaque, drv->format_name);
814 BlockDriverState *bdrv_find(const char *name)
816 BlockDriverState *bs;
818 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
819 if (!strcmp(name, bs->device_name))
825 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
827 BlockDriverState *bs;
829 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
830 it(opaque, bs->device_name);
834 const char *bdrv_get_device_name(BlockDriverState *bs)
836 return bs->device_name;
839 void bdrv_flush(BlockDriverState *bs)
841 if (bs->drv->bdrv_flush)
842 bs->drv->bdrv_flush(bs);
844 bdrv_flush(bs->backing_hd);
849 BlockDriverState *bs;
851 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
852 term_printf("%s:", bs->device_name);
853 term_printf(" type=");
858 case BDRV_TYPE_CDROM:
859 term_printf("cdrom");
861 case BDRV_TYPE_FLOPPY:
862 term_printf("floppy");
865 term_printf(" removable=%d", bs->removable);
867 term_printf(" locked=%d", bs->locked);
870 term_printf(" file=%s", bs->filename);
871 if (bs->backing_file[0] != '\0')
872 term_printf(" backing_file=%s", bs->backing_file);
873 term_printf(" ro=%d", bs->read_only);
874 term_printf(" drv=%s", bs->drv->format_name);
876 term_printf(" encrypted");
878 term_printf(" [not inserted]");
884 void bdrv_get_backing_filename(BlockDriverState *bs,
885 char *filename, int filename_size)
887 if (!bs->backing_hd) {
888 pstrcpy(filename, filename_size, "");
890 pstrcpy(filename, filename_size, bs->backing_file);
894 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
895 const uint8_t *buf, int nb_sectors)
897 BlockDriver *drv = bs->drv;
900 if (!drv->bdrv_write_compressed)
902 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
905 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
907 BlockDriver *drv = bs->drv;
910 if (!drv->bdrv_get_info)
912 memset(bdi, 0, sizeof(*bdi));
913 return drv->bdrv_get_info(bs, bdi);
916 /**************************************************************/
917 /* handling of snapshots */
919 int bdrv_snapshot_create(BlockDriverState *bs,
920 QEMUSnapshotInfo *sn_info)
922 BlockDriver *drv = bs->drv;
925 if (!drv->bdrv_snapshot_create)
927 return drv->bdrv_snapshot_create(bs, sn_info);
930 int bdrv_snapshot_goto(BlockDriverState *bs,
931 const char *snapshot_id)
933 BlockDriver *drv = bs->drv;
936 if (!drv->bdrv_snapshot_goto)
938 return drv->bdrv_snapshot_goto(bs, snapshot_id);
941 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
943 BlockDriver *drv = bs->drv;
946 if (!drv->bdrv_snapshot_delete)
948 return drv->bdrv_snapshot_delete(bs, snapshot_id);
951 int bdrv_snapshot_list(BlockDriverState *bs,
952 QEMUSnapshotInfo **psn_info)
954 BlockDriver *drv = bs->drv;
957 if (!drv->bdrv_snapshot_list)
959 return drv->bdrv_snapshot_list(bs, psn_info);
962 #define NB_SUFFIXES 4
964 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
966 static const char suffixes[NB_SUFFIXES] = "KMGT";
971 snprintf(buf, buf_size, "%" PRId64, size);
974 for(i = 0; i < NB_SUFFIXES; i++) {
975 if (size < (10 * base)) {
976 snprintf(buf, buf_size, "%0.1f%c",
980 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
981 snprintf(buf, buf_size, "%" PRId64 "%c",
982 ((size + (base >> 1)) / base),
992 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
994 char buf1[128], date_buf[128], clock_buf[128];
1000 snprintf(buf, buf_size,
1001 "%-10s%-20s%7s%20s%15s",
1002 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1006 localtime_r(&ti, &tm);
1008 strftime(date_buf, sizeof(date_buf),
1009 "%Y-%m-%d %H:%M:%S", &tm);
1010 secs = sn->vm_clock_nsec / 1000000000;
1011 snprintf(clock_buf, sizeof(clock_buf),
1012 "%02d:%02d:%02d.%03d",
1014 (int)((secs / 60) % 60),
1016 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1017 snprintf(buf, buf_size,
1018 "%-10s%-20s%7s%20s%15s",
1019 sn->id_str, sn->name,
1020 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1028 /**************************************************************/
1031 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1032 uint8_t *buf, int nb_sectors,
1033 BlockDriverCompletionFunc *cb, void *opaque)
1035 BlockDriver *drv = bs->drv;
1040 /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1041 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1042 memcpy(buf, bs->boot_sector_data, 512);
1048 return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1051 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1052 const uint8_t *buf, int nb_sectors,
1053 BlockDriverCompletionFunc *cb, void *opaque)
1055 BlockDriver *drv = bs->drv;
1061 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1062 memcpy(bs->boot_sector_data, buf, 512);
1065 return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1068 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1070 BlockDriver *drv = acb->bs->drv;
1072 drv->bdrv_aio_cancel(acb);
1076 /**************************************************************/
1077 /* async block device emulation */
1080 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1081 int64_t sector_num, uint8_t *buf, int nb_sectors,
1082 BlockDriverCompletionFunc *cb, void *opaque)
1085 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1090 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1091 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1092 BlockDriverCompletionFunc *cb, void *opaque)
1095 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1100 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
1104 static void bdrv_aio_bh_cb(void *opaque)
1106 BlockDriverAIOCBSync *acb = opaque;
1107 acb->common.cb(acb->common.opaque, acb->ret);
1108 qemu_aio_release(acb);
1111 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1112 int64_t sector_num, uint8_t *buf, int nb_sectors,
1113 BlockDriverCompletionFunc *cb, void *opaque)
1115 BlockDriverAIOCBSync *acb;
1118 acb = qemu_aio_get(bs, cb, opaque);
1120 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1121 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1123 qemu_bh_schedule(acb->bh);
1124 return &acb->common;
1127 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1128 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1129 BlockDriverCompletionFunc *cb, void *opaque)
1131 BlockDriverAIOCBSync *acb;
1134 acb = qemu_aio_get(bs, cb, opaque);
1136 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1137 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1139 qemu_bh_schedule(acb->bh);
1140 return &acb->common;
1143 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1145 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1146 qemu_bh_cancel(acb->bh);
1147 qemu_aio_release(acb);
1149 #endif /* !QEMU_TOOL */
1151 /**************************************************************/
1152 /* sync block device emulation */
1154 static void bdrv_rw_em_cb(void *opaque, int ret)
1156 *(int *)opaque = ret;
1159 #define NOT_DONE 0x7fffffff
1161 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1162 uint8_t *buf, int nb_sectors)
1165 BlockDriverAIOCB *acb;
1167 async_ret = NOT_DONE;
1168 qemu_aio_wait_start();
1169 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1170 bdrv_rw_em_cb, &async_ret);
1172 qemu_aio_wait_end();
1175 while (async_ret == NOT_DONE) {
1178 qemu_aio_wait_end();
1182 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1183 const uint8_t *buf, int nb_sectors)
1186 BlockDriverAIOCB *acb;
1188 async_ret = NOT_DONE;
1189 qemu_aio_wait_start();
1190 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1191 bdrv_rw_em_cb, &async_ret);
1193 qemu_aio_wait_end();
1196 while (async_ret == NOT_DONE) {
1199 qemu_aio_wait_end();
1203 void bdrv_init(void)
1205 bdrv_register(&bdrv_raw);
1206 bdrv_register(&bdrv_host_device);
1208 bdrv_register(&bdrv_cow);
1210 bdrv_register(&bdrv_qcow);
1211 bdrv_register(&bdrv_vmdk);
1212 bdrv_register(&bdrv_cloop);
1213 bdrv_register(&bdrv_dmg);
1214 bdrv_register(&bdrv_bochs);
1215 bdrv_register(&bdrv_vpc);
1216 bdrv_register(&bdrv_vvfat);
1217 bdrv_register(&bdrv_qcow2);
1220 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1224 BlockDriverAIOCB *acb;
1227 if (drv->free_aiocb) {
1228 acb = drv->free_aiocb;
1229 drv->free_aiocb = acb->next;
1231 acb = qemu_mallocz(drv->aiocb_size);
1237 acb->opaque = opaque;
1241 void qemu_aio_release(void *p)
1243 BlockDriverAIOCB *acb = p;
1244 BlockDriver *drv = acb->bs->drv;
1245 acb->next = drv->free_aiocb;
1246 drv->free_aiocb = acb;
1249 /**************************************************************/
1250 /* removable device support */
1253 * Return TRUE if the media is present
1255 int bdrv_is_inserted(BlockDriverState *bs)
1257 BlockDriver *drv = bs->drv;
1261 if (!drv->bdrv_is_inserted)
1263 ret = drv->bdrv_is_inserted(bs);
1268 * Return TRUE if the media changed since the last call to this
1269 * function. It is currently only used for floppy disks
1271 int bdrv_media_changed(BlockDriverState *bs)
1273 BlockDriver *drv = bs->drv;
1276 if (!drv || !drv->bdrv_media_changed)
1279 ret = drv->bdrv_media_changed(bs);
1280 if (ret == -ENOTSUP)
1281 ret = bs->media_changed;
1282 bs->media_changed = 0;
1287 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1289 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1291 BlockDriver *drv = bs->drv;
1294 if (!drv || !drv->bdrv_eject) {
1297 ret = drv->bdrv_eject(bs, eject_flag);
1299 if (ret == -ENOTSUP) {
1305 int bdrv_is_locked(BlockDriverState *bs)
1311 * Lock or unlock the media (if it is locked, the user won't be able
1312 * to eject it manually).
1314 void bdrv_set_locked(BlockDriverState *bs, int locked)
1316 BlockDriver *drv = bs->drv;
1318 bs->locked = locked;
1319 if (drv && drv->bdrv_set_locked) {
1320 drv->bdrv_set_locked(bs, locked);