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 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
39 int64_t sector_num, uint8_t *buf, int nb_sectors,
40 BlockDriverCompletionFunc *cb, void *opaque);
41 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
42 int64_t sector_num, const uint8_t *buf, int nb_sectors,
43 BlockDriverCompletionFunc *cb, void *opaque);
44 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
45 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
46 uint8_t *buf, int nb_sectors);
47 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
48 const uint8_t *buf, int nb_sectors);
50 static BlockDriverState *bdrv_first;
51 static BlockDriver *first_drv;
59 int path_is_absolute(const char *path)
62 p = strchr(path, ':');
67 return (*p == PATH_SEP);
70 /* if filename is absolute, just copy it to dest. Otherwise, build a
71 path to it by considering it is relative to base_path. URL are
73 void path_combine(char *dest, int dest_size,
74 const char *base_path,
82 if (path_is_absolute(filename)) {
83 pstrcpy(dest, dest_size, filename);
85 p = strchr(base_path, ':');
90 p1 = strrchr(base_path, PATH_SEP);
98 if (len > dest_size - 1)
100 memcpy(dest, base_path, len);
102 pstrcat(dest, dest_size, filename);
107 void bdrv_register(BlockDriver *bdrv)
109 if (!bdrv->bdrv_aio_read) {
110 /* add AIO emulation layer */
111 bdrv->bdrv_aio_read = bdrv_aio_read_em;
112 bdrv->bdrv_aio_write = bdrv_aio_write_em;
113 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
114 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
115 /* add synchronous IO emulation layer */
116 bdrv->bdrv_read = bdrv_read_em;
117 bdrv->bdrv_write = bdrv_write_em;
119 bdrv->next = first_drv;
123 /* create a new block device (by default it is empty) */
124 BlockDriverState *bdrv_new(const char *device_name)
126 BlockDriverState **pbs, *bs;
128 bs = qemu_mallocz(sizeof(BlockDriverState));
131 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
132 if (device_name[0] != '\0') {
133 /* insert at the end */
142 BlockDriver *bdrv_find_format(const char *format_name)
145 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
146 if (!strcmp(drv1->format_name, format_name))
152 int bdrv_create(BlockDriver *drv,
153 const char *filename, int64_t size_in_sectors,
154 const char *backing_file, int flags)
156 if (!drv->bdrv_create)
158 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
162 void get_tmp_filename(char *filename, int size)
167 void get_tmp_filename(char *filename, int size)
170 /* XXX: race condition possible */
171 pstrcpy(filename, size, "/tmp/vl.XXXXXX");
172 fd = mkstemp(filename);
177 static BlockDriver *find_protocol(const char *filename)
183 p = strchr(filename, ':');
187 if (len > sizeof(protocol) - 1)
188 len = sizeof(protocol) - 1;
191 /* specific win32 case for driver letters */
195 memcpy(protocol, filename, len);
196 protocol[len] = '\0';
197 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
198 if (drv1->protocol_name &&
199 !strcmp(drv1->protocol_name, protocol))
205 /* XXX: force raw format if block or character device ? It would
206 simplify the BSD case */
207 static BlockDriver *find_image_format(const char *filename)
209 int ret, score, score_max;
210 BlockDriver *drv1, *drv;
212 BlockDriverState *bs;
214 drv = find_protocol(filename);
215 /* no need to test disk image formats for vvfat or host specific
217 if (drv == &bdrv_vvfat)
219 if (strstart(filename, "/dev/", NULL))
222 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
225 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
232 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
233 if (drv1->bdrv_probe) {
234 score = drv1->bdrv_probe(buf, ret, filename);
235 if (score > score_max) {
244 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
246 BlockDriverState *bs;
252 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
261 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
263 return bdrv_open2(bs, filename, flags, NULL);
266 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
270 char tmp_filename[1024];
271 char backing_filename[1024];
274 bs->is_temporary = 0;
277 if (flags & BDRV_O_SNAPSHOT) {
278 BlockDriverState *bs1;
281 /* if snapshot, we create a temporary backing file and open it
282 instead of opening 'filename' directly */
284 /* if there is a backing file, use it */
289 if (bdrv_open(bs1, filename, 0) < 0) {
293 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
296 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
297 if (bdrv_create(&bdrv_qcow2, tmp_filename,
298 total_size, filename, 0) < 0) {
301 filename = tmp_filename;
302 bs->is_temporary = 1;
305 pstrcpy(bs->filename, sizeof(bs->filename), filename);
306 if (flags & BDRV_O_FILE) {
307 drv = find_protocol(filename);
312 drv = find_image_format(filename);
318 bs->opaque = qemu_mallocz(drv->instance_size);
319 if (bs->opaque == NULL && drv->instance_size > 0)
321 /* Note: for compatibility, we open disk image files as RDWR, and
322 RDONLY as fallback */
323 if (!(flags & BDRV_O_FILE))
324 open_flags = BDRV_O_RDWR;
326 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
327 ret = drv->bdrv_open(bs, filename, open_flags);
328 if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
329 ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
333 qemu_free(bs->opaque);
336 if (drv->bdrv_getlength) {
337 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
340 if (bs->is_temporary) {
344 if (bs->backing_file[0] != '\0') {
345 /* if there is a backing file, use it */
346 bs->backing_hd = bdrv_new("");
347 if (!bs->backing_hd) {
352 path_combine(backing_filename, sizeof(backing_filename),
353 filename, bs->backing_file);
354 if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
360 /* call the change callback */
362 bs->change_cb(bs->change_opaque);
367 void bdrv_close(BlockDriverState *bs)
371 bdrv_delete(bs->backing_hd);
372 bs->drv->bdrv_close(bs);
373 qemu_free(bs->opaque);
375 if (bs->is_temporary) {
376 unlink(bs->filename);
383 /* call the change callback */
385 bs->change_cb(bs->change_opaque);
389 void bdrv_delete(BlockDriverState *bs)
391 /* XXX: remove the driver list */
396 /* commit COW file into the raw image */
397 int bdrv_commit(BlockDriverState *bs)
399 int64_t i, total_sectors;
401 unsigned char sector[512];
410 if (!bs->backing_hd) {
414 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
415 for (i = 0; i < total_sectors;) {
416 if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
417 for(j = 0; j < n; j++) {
418 if (bdrv_read(bs, i, sector, 1) != 0) {
422 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
432 if (bs->drv->bdrv_make_empty)
433 return bs->drv->bdrv_make_empty(bs);
438 /* return < 0 if error */
439 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
440 uint8_t *buf, int nb_sectors)
442 BlockDriver *drv = bs->drv;
447 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
448 memcpy(buf, bs->boot_sector_data, 512);
455 if (drv->bdrv_pread) {
457 len = nb_sectors * 512;
458 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
466 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
470 /* return < 0 if error */
471 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
472 const uint8_t *buf, int nb_sectors)
474 BlockDriver *drv = bs->drv;
479 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
480 memcpy(bs->boot_sector_data, buf, 512);
482 if (drv->bdrv_pwrite) {
484 len = nb_sectors * 512;
485 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
493 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
497 /* not necessary now */
498 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
499 uint8_t *buf, int count1)
501 uint8_t tmp_buf[SECTOR_SIZE];
502 int len, nb_sectors, count;
506 /* first read to align to sector start */
507 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
510 sector_num = offset >> SECTOR_BITS;
512 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
514 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
522 /* read the sectors "in place" */
523 nb_sectors = count >> SECTOR_BITS;
524 if (nb_sectors > 0) {
525 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
527 sector_num += nb_sectors;
528 len = nb_sectors << SECTOR_BITS;
533 /* add data from the last sector */
535 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
537 memcpy(buf, tmp_buf, count);
542 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
543 const uint8_t *buf, int count1)
545 uint8_t tmp_buf[SECTOR_SIZE];
546 int len, nb_sectors, count;
550 /* first write to align to sector start */
551 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
554 sector_num = offset >> SECTOR_BITS;
556 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
558 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
559 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
568 /* write the sectors "in place" */
569 nb_sectors = count >> SECTOR_BITS;
570 if (nb_sectors > 0) {
571 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
573 sector_num += nb_sectors;
574 len = nb_sectors << SECTOR_BITS;
579 /* add data from the last sector */
581 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
583 memcpy(tmp_buf, buf, count);
584 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
591 * Read with byte offsets (needed only for file protocols)
593 int bdrv_pread(BlockDriverState *bs, int64_t offset,
594 void *buf1, int count1)
596 BlockDriver *drv = bs->drv;
600 if (!drv->bdrv_pread)
601 return bdrv_pread_em(bs, offset, buf1, count1);
602 return drv->bdrv_pread(bs, offset, buf1, count1);
606 * Write with byte offsets (needed only for file protocols)
608 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
609 const void *buf1, int count1)
611 BlockDriver *drv = bs->drv;
615 if (!drv->bdrv_pwrite)
616 return bdrv_pwrite_em(bs, offset, buf1, count1);
617 return drv->bdrv_pwrite(bs, offset, buf1, count1);
621 * Truncate file to 'offset' bytes (needed only for file protocols)
623 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
625 BlockDriver *drv = bs->drv;
628 if (!drv->bdrv_truncate)
630 return drv->bdrv_truncate(bs, offset);
634 * Length of a file in bytes. Return < 0 if error or unknown.
636 int64_t bdrv_getlength(BlockDriverState *bs)
638 BlockDriver *drv = bs->drv;
641 if (!drv->bdrv_getlength) {
643 return bs->total_sectors * SECTOR_SIZE;
645 return drv->bdrv_getlength(bs);
648 void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
650 *nb_sectors_ptr = bs->total_sectors;
653 /* force a given boot sector. */
654 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
656 bs->boot_sector_enabled = 1;
659 memcpy(bs->boot_sector_data, data, size);
660 memset(bs->boot_sector_data + size, 0, 512 - size);
663 void bdrv_set_geometry_hint(BlockDriverState *bs,
664 int cyls, int heads, int secs)
671 void bdrv_set_type_hint(BlockDriverState *bs, int type)
674 bs->removable = ((type == BDRV_TYPE_CDROM ||
675 type == BDRV_TYPE_FLOPPY));
678 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
680 bs->translation = translation;
683 void bdrv_get_geometry_hint(BlockDriverState *bs,
684 int *pcyls, int *pheads, int *psecs)
691 int bdrv_get_type_hint(BlockDriverState *bs)
696 int bdrv_get_translation_hint(BlockDriverState *bs)
698 return bs->translation;
701 int bdrv_is_removable(BlockDriverState *bs)
703 return bs->removable;
706 int bdrv_is_read_only(BlockDriverState *bs)
708 return bs->read_only;
711 int bdrv_is_inserted(BlockDriverState *bs)
716 int bdrv_is_locked(BlockDriverState *bs)
721 void bdrv_set_locked(BlockDriverState *bs, int locked)
726 void bdrv_set_change_cb(BlockDriverState *bs,
727 void (*change_cb)(void *opaque), void *opaque)
729 bs->change_cb = change_cb;
730 bs->change_opaque = opaque;
733 int bdrv_is_encrypted(BlockDriverState *bs)
735 if (bs->backing_hd && bs->backing_hd->encrypted)
737 return bs->encrypted;
740 int bdrv_set_key(BlockDriverState *bs, const char *key)
743 if (bs->backing_hd && bs->backing_hd->encrypted) {
744 ret = bdrv_set_key(bs->backing_hd, key);
750 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
752 return bs->drv->bdrv_set_key(bs, key);
755 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
757 if (!bs->inserted || !bs->drv) {
760 pstrcpy(buf, buf_size, bs->drv->format_name);
764 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
769 for (drv = first_drv; drv != NULL; drv = drv->next) {
770 it(opaque, drv->format_name);
774 BlockDriverState *bdrv_find(const char *name)
776 BlockDriverState *bs;
778 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
779 if (!strcmp(name, bs->device_name))
785 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
787 BlockDriverState *bs;
789 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
790 it(opaque, bs->device_name);
794 const char *bdrv_get_device_name(BlockDriverState *bs)
796 return bs->device_name;
799 void bdrv_flush(BlockDriverState *bs)
801 if (bs->drv->bdrv_flush)
802 bs->drv->bdrv_flush(bs);
804 bdrv_flush(bs->backing_hd);
809 BlockDriverState *bs;
811 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
812 term_printf("%s:", bs->device_name);
813 term_printf(" type=");
818 case BDRV_TYPE_CDROM:
819 term_printf("cdrom");
821 case BDRV_TYPE_FLOPPY:
822 term_printf("floppy");
825 term_printf(" removable=%d", bs->removable);
827 term_printf(" locked=%d", bs->locked);
830 term_printf(" file=%s", bs->filename);
831 if (bs->backing_file[0] != '\0')
832 term_printf(" backing_file=%s", bs->backing_file);
833 term_printf(" ro=%d", bs->read_only);
834 term_printf(" drv=%s", bs->drv->format_name);
836 term_printf(" encrypted");
838 term_printf(" [not inserted]");
844 void bdrv_get_backing_filename(BlockDriverState *bs,
845 char *filename, int filename_size)
847 if (!bs->backing_hd) {
848 pstrcpy(filename, filename_size, "");
850 pstrcpy(filename, filename_size, bs->backing_file);
854 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
855 const uint8_t *buf, int nb_sectors)
857 BlockDriver *drv = bs->drv;
860 if (!drv->bdrv_write_compressed)
862 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
865 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
867 BlockDriver *drv = bs->drv;
870 if (!drv->bdrv_get_info)
872 memset(bdi, 0, sizeof(*bdi));
873 return drv->bdrv_get_info(bs, bdi);
876 /**************************************************************/
877 /* handling of snapshots */
879 int bdrv_snapshot_create(BlockDriverState *bs,
880 QEMUSnapshotInfo *sn_info)
882 BlockDriver *drv = bs->drv;
885 if (!drv->bdrv_snapshot_create)
887 return drv->bdrv_snapshot_create(bs, sn_info);
890 int bdrv_snapshot_goto(BlockDriverState *bs,
891 const char *snapshot_id)
893 BlockDriver *drv = bs->drv;
896 if (!drv->bdrv_snapshot_goto)
898 return drv->bdrv_snapshot_goto(bs, snapshot_id);
901 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
903 BlockDriver *drv = bs->drv;
906 if (!drv->bdrv_snapshot_delete)
908 return drv->bdrv_snapshot_delete(bs, snapshot_id);
911 int bdrv_snapshot_list(BlockDriverState *bs,
912 QEMUSnapshotInfo **psn_info)
914 BlockDriver *drv = bs->drv;
917 if (!drv->bdrv_snapshot_list)
919 return drv->bdrv_snapshot_list(bs, psn_info);
922 #define NB_SUFFIXES 4
924 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
926 static const char suffixes[NB_SUFFIXES] = "KMGT";
931 snprintf(buf, buf_size, "%" PRId64, size);
934 for(i = 0; i < NB_SUFFIXES; i++) {
935 if (size < (10 * base)) {
936 snprintf(buf, buf_size, "%0.1f%c",
940 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
941 snprintf(buf, buf_size, "%" PRId64 "%c",
942 ((size + (base >> 1)) / base),
952 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
954 char buf1[128], date_buf[128], clock_buf[128];
960 snprintf(buf, buf_size,
961 "%-10s%-20s%7s%20s%15s",
962 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
966 localtime_r(&ti, &tm);
968 strftime(date_buf, sizeof(date_buf),
969 "%Y-%m-%d %H:%M:%S", &tm);
970 secs = sn->vm_clock_nsec / 1000000000;
971 snprintf(clock_buf, sizeof(clock_buf),
972 "%02d:%02d:%02d.%03d",
974 (int)((secs / 60) % 60),
976 (int)((sn->vm_clock_nsec / 1000000) % 1000));
977 snprintf(buf, buf_size,
978 "%-10s%-20s%7s%20s%15s",
979 sn->id_str, sn->name,
980 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
988 /**************************************************************/
991 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
992 uint8_t *buf, int nb_sectors,
993 BlockDriverCompletionFunc *cb, void *opaque)
995 BlockDriver *drv = bs->drv;
1000 /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1001 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1002 memcpy(buf, bs->boot_sector_data, 512);
1008 return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1011 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1012 const uint8_t *buf, int nb_sectors,
1013 BlockDriverCompletionFunc *cb, void *opaque)
1015 BlockDriver *drv = bs->drv;
1021 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1022 memcpy(bs->boot_sector_data, buf, 512);
1025 return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1028 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1030 BlockDriver *drv = acb->bs->drv;
1032 drv->bdrv_aio_cancel(acb);
1036 /**************************************************************/
1037 /* async block device emulation */
1040 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1041 int64_t sector_num, uint8_t *buf, int nb_sectors,
1042 BlockDriverCompletionFunc *cb, void *opaque)
1045 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1050 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1051 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1052 BlockDriverCompletionFunc *cb, void *opaque)
1055 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1060 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
1064 typedef struct BlockDriverAIOCBSync {
1065 BlockDriverAIOCB common;
1068 } BlockDriverAIOCBSync;
1070 static BlockDriverAIOCBSync *free_acb = NULL;
1072 static void bdrv_aio_bh_cb(void *opaque)
1074 BlockDriverAIOCBSync *acb = opaque;
1075 acb->common.cb(acb->common.opaque, acb->ret);
1076 qemu_aio_release(acb);
1079 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1080 int64_t sector_num, uint8_t *buf, int nb_sectors,
1081 BlockDriverCompletionFunc *cb, void *opaque)
1083 BlockDriverAIOCBSync *acb;
1086 acb = qemu_aio_get(bs, cb, opaque);
1088 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1089 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1091 qemu_bh_schedule(acb->bh);
1092 return &acb->common;
1095 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1096 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1097 BlockDriverCompletionFunc *cb, void *opaque)
1099 BlockDriverAIOCBSync *acb;
1102 acb = qemu_aio_get(bs, cb, opaque);
1104 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1105 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1107 qemu_bh_schedule(acb->bh);
1108 return &acb->common;
1111 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1113 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1114 qemu_bh_cancel(acb->bh);
1115 qemu_aio_release(acb);
1117 #endif /* !QEMU_TOOL */
1119 /**************************************************************/
1120 /* sync block device emulation */
1122 static void bdrv_rw_em_cb(void *opaque, int ret)
1124 *(int *)opaque = ret;
1127 #define NOT_DONE 0x7fffffff
1129 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1130 uint8_t *buf, int nb_sectors)
1133 BlockDriverAIOCB *acb;
1135 async_ret = NOT_DONE;
1136 qemu_aio_wait_start();
1137 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1138 bdrv_rw_em_cb, &async_ret);
1140 qemu_aio_wait_end();
1143 while (async_ret == NOT_DONE) {
1146 qemu_aio_wait_end();
1150 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1151 const uint8_t *buf, int nb_sectors)
1154 BlockDriverAIOCB *acb;
1156 async_ret = NOT_DONE;
1157 qemu_aio_wait_start();
1158 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1159 bdrv_rw_em_cb, &async_ret);
1161 qemu_aio_wait_end();
1164 while (async_ret == NOT_DONE) {
1167 qemu_aio_wait_end();
1171 void bdrv_init(void)
1173 bdrv_register(&bdrv_raw);
1175 bdrv_register(&bdrv_cow);
1177 bdrv_register(&bdrv_qcow);
1178 bdrv_register(&bdrv_vmdk);
1179 bdrv_register(&bdrv_cloop);
1180 bdrv_register(&bdrv_dmg);
1181 bdrv_register(&bdrv_bochs);
1182 bdrv_register(&bdrv_vpc);
1183 bdrv_register(&bdrv_vvfat);
1184 bdrv_register(&bdrv_qcow2);
1187 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1191 BlockDriverAIOCB *acb;
1194 if (drv->free_aiocb) {
1195 acb = drv->free_aiocb;
1196 drv->free_aiocb = acb->next;
1198 acb = qemu_mallocz(drv->aiocb_size);
1204 acb->opaque = opaque;
1208 void qemu_aio_release(void *p)
1210 BlockDriverAIOCB *acb = p;
1211 BlockDriver *drv = acb->bs->drv;
1212 acb->next = drv->free_aiocb;
1213 drv->free_aiocb = acb;