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
24 #include "qemu-common.h"
26 #include "block_int.h"
29 #include <sys/types.h>
31 #include <sys/ioctl.h>
32 #include <sys/queue.h>
37 #define SECTOR_SIZE (1 << SECTOR_BITS)
39 typedef struct BlockDriverAIOCBSync {
40 BlockDriverAIOCB common;
43 } BlockDriverAIOCBSync;
45 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
46 int64_t sector_num, uint8_t *buf, int nb_sectors,
47 BlockDriverCompletionFunc *cb, void *opaque);
48 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
49 int64_t sector_num, const uint8_t *buf, int nb_sectors,
50 BlockDriverCompletionFunc *cb, void *opaque);
51 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
52 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
53 uint8_t *buf, int nb_sectors);
54 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
55 const uint8_t *buf, int nb_sectors);
57 static BlockDriver *first_drv;
59 int path_is_absolute(const char *path)
63 /* specific case for names like: "\\.\d:" */
64 if (*path == '/' || *path == '\\')
67 p = strchr(path, ':');
73 return (*p == '/' || *p == '\\');
79 /* if filename is absolute, just copy it to dest. Otherwise, build a
80 path to it by considering it is relative to base_path. URL are
82 void path_combine(char *dest, int dest_size,
83 const char *base_path,
91 if (path_is_absolute(filename)) {
92 pstrcpy(dest, dest_size, filename);
94 p = strchr(base_path, ':');
99 p1 = strrchr(base_path, '/');
103 p2 = strrchr(base_path, '\\');
115 if (len > dest_size - 1)
117 memcpy(dest, base_path, len);
119 pstrcat(dest, dest_size, filename);
124 static void bdrv_register(BlockDriver *bdrv)
126 if (!bdrv->bdrv_aio_read) {
127 /* add AIO emulation layer */
128 bdrv->bdrv_aio_read = bdrv_aio_read_em;
129 bdrv->bdrv_aio_write = bdrv_aio_write_em;
130 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
131 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
132 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
133 /* add synchronous IO emulation layer */
134 bdrv->bdrv_read = bdrv_read_em;
135 bdrv->bdrv_write = bdrv_write_em;
137 bdrv->next = first_drv;
141 /* create a new block device (by default it is empty) */
142 BlockDriverState *bdrv_new(const char *device_name)
144 BlockDriverState **pbs, *bs;
146 bs = qemu_mallocz(sizeof(BlockDriverState));
149 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
150 if (device_name[0] != '\0') {
151 /* insert at the end */
160 BlockDriver *bdrv_find_format(const char *format_name)
163 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
164 if (!strcmp(drv1->format_name, format_name))
170 int bdrv_create(BlockDriver *drv,
171 const char *filename, int64_t size_in_sectors,
172 const char *backing_file, int flags)
174 if (!drv->bdrv_create)
176 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
180 void get_tmp_filename(char *filename, int size)
182 char temp_dir[MAX_PATH];
184 GetTempPath(MAX_PATH, temp_dir);
185 GetTempFileName(temp_dir, "qem", 0, filename);
188 void get_tmp_filename(char *filename, int size)
192 /* XXX: race condition possible */
193 tmpdir = getenv("TMPDIR");
196 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
197 fd = mkstemp(filename);
203 static int is_windows_drive_prefix(const char *filename)
205 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
206 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
210 static int is_windows_drive(const char *filename)
212 if (is_windows_drive_prefix(filename) &&
215 if (strstart(filename, "\\\\.\\", NULL) ||
216 strstart(filename, "//./", NULL))
222 static BlockDriver *find_protocol(const char *filename)
230 if (is_windows_drive(filename) ||
231 is_windows_drive_prefix(filename))
234 p = strchr(filename, ':');
238 if (len > sizeof(protocol) - 1)
239 len = sizeof(protocol) - 1;
240 memcpy(protocol, filename, len);
241 protocol[len] = '\0';
242 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
243 if (drv1->protocol_name &&
244 !strcmp(drv1->protocol_name, protocol))
250 /* XXX: force raw format if block or character device ? It would
251 simplify the BSD case */
252 static BlockDriver *find_image_format(const char *filename)
254 int ret, score, score_max;
255 BlockDriver *drv1, *drv;
257 BlockDriverState *bs;
259 /* detect host devices. By convention, /dev/cdrom[N] is always
260 recognized as a host CDROM */
261 if (strstart(filename, "/dev/cdrom", NULL))
262 return &bdrv_host_device;
264 if (is_windows_drive(filename))
265 return &bdrv_host_device;
269 if (stat(filename, &st) >= 0 &&
270 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
271 return &bdrv_host_device;
276 drv = find_protocol(filename);
277 /* no need to test disk image formats for vvfat */
278 if (drv == &bdrv_vvfat)
281 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
284 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
291 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
292 if (drv1->bdrv_probe) {
293 score = drv1->bdrv_probe(buf, ret, filename);
294 if (score > score_max) {
303 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
305 BlockDriverState *bs;
311 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
320 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
322 return bdrv_open2(bs, filename, flags, NULL);
325 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
329 char tmp_filename[PATH_MAX];
330 char backing_filename[PATH_MAX];
333 bs->is_temporary = 0;
336 if (flags & BDRV_O_SNAPSHOT) {
337 BlockDriverState *bs1;
341 /* if snapshot, we create a temporary backing file and open it
342 instead of opening 'filename' directly */
344 /* if there is a backing file, use it */
349 if (bdrv_open(bs1, filename, 0) < 0) {
353 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
355 if (bs1->drv && bs1->drv->protocol_name)
360 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
362 /* Real path is meaningless for protocols */
364 snprintf(backing_filename, sizeof(backing_filename),
367 realpath(filename, backing_filename);
369 if (bdrv_create(&bdrv_qcow2, tmp_filename,
370 total_size, backing_filename, 0) < 0) {
373 filename = tmp_filename;
374 bs->is_temporary = 1;
377 pstrcpy(bs->filename, sizeof(bs->filename), filename);
378 if (flags & BDRV_O_FILE) {
379 drv = find_protocol(filename);
384 drv = find_image_format(filename);
390 bs->opaque = qemu_mallocz(drv->instance_size);
391 if (bs->opaque == NULL && drv->instance_size > 0)
393 /* Note: for compatibility, we open disk image files as RDWR, and
394 RDONLY as fallback */
395 if (!(flags & BDRV_O_FILE))
396 open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT);
398 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
399 ret = drv->bdrv_open(bs, filename, open_flags);
400 if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
401 ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
405 qemu_free(bs->opaque);
410 if (drv->bdrv_getlength) {
411 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
414 if (bs->is_temporary) {
418 if (bs->backing_file[0] != '\0') {
419 /* if there is a backing file, use it */
420 bs->backing_hd = bdrv_new("");
421 if (!bs->backing_hd) {
426 path_combine(backing_filename, sizeof(backing_filename),
427 filename, bs->backing_file);
428 if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
432 /* call the change callback */
433 bs->media_changed = 1;
435 bs->change_cb(bs->change_opaque);
440 void bdrv_close(BlockDriverState *bs)
444 bdrv_delete(bs->backing_hd);
445 bs->drv->bdrv_close(bs);
446 qemu_free(bs->opaque);
448 if (bs->is_temporary) {
449 unlink(bs->filename);
455 /* call the change callback */
456 bs->media_changed = 1;
458 bs->change_cb(bs->change_opaque);
462 void bdrv_delete(BlockDriverState *bs)
464 BlockDriverState **pbs;
467 while (*pbs != bs && *pbs != NULL)
476 /* commit COW file into the raw image */
477 int bdrv_commit(BlockDriverState *bs)
479 BlockDriver *drv = bs->drv;
480 int64_t i, total_sectors;
482 unsigned char sector[512];
491 if (!bs->backing_hd) {
495 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
496 for (i = 0; i < total_sectors;) {
497 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
498 for(j = 0; j < n; j++) {
499 if (bdrv_read(bs, i, sector, 1) != 0) {
503 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
513 if (drv->bdrv_make_empty)
514 return drv->bdrv_make_empty(bs);
519 /* return < 0 if error. See bdrv_write() for the return codes */
520 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
521 uint8_t *buf, int nb_sectors)
523 BlockDriver *drv = bs->drv;
528 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
529 memcpy(buf, bs->boot_sector_data, 512);
536 if (drv->bdrv_pread) {
538 len = nb_sectors * 512;
539 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
545 bs->rd_bytes += (unsigned) len;
550 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
554 /* Return < 0 if error. Important errors are:
555 -EIO generic I/O error (may happen for all errors)
556 -ENOMEDIUM No media inserted.
557 -EINVAL Invalid sector number or nb_sectors
558 -EACCES Trying to write a read-only device
560 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
561 const uint8_t *buf, int nb_sectors)
563 BlockDriver *drv = bs->drv;
568 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
569 memcpy(bs->boot_sector_data, buf, 512);
571 if (drv->bdrv_pwrite) {
573 len = nb_sectors * 512;
574 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
580 bs->wr_bytes += (unsigned) len;
585 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
589 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
590 uint8_t *buf, int count1)
592 uint8_t tmp_buf[SECTOR_SIZE];
593 int len, nb_sectors, count;
597 /* first read 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(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
613 /* read the sectors "in place" */
614 nb_sectors = count >> SECTOR_BITS;
615 if (nb_sectors > 0) {
616 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
618 sector_num += nb_sectors;
619 len = nb_sectors << SECTOR_BITS;
624 /* add data from the last sector */
626 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
628 memcpy(buf, tmp_buf, count);
633 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
634 const uint8_t *buf, int count1)
636 uint8_t tmp_buf[SECTOR_SIZE];
637 int len, nb_sectors, count;
641 /* first write to align to sector start */
642 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
645 sector_num = offset >> SECTOR_BITS;
647 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
649 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
650 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
659 /* write the sectors "in place" */
660 nb_sectors = count >> SECTOR_BITS;
661 if (nb_sectors > 0) {
662 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
664 sector_num += nb_sectors;
665 len = nb_sectors << SECTOR_BITS;
670 /* add data from the last sector */
672 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
674 memcpy(tmp_buf, buf, count);
675 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
682 * Read with byte offsets (needed only for file protocols)
684 int bdrv_pread(BlockDriverState *bs, int64_t offset,
685 void *buf1, int count1)
687 BlockDriver *drv = bs->drv;
691 if (!drv->bdrv_pread)
692 return bdrv_pread_em(bs, offset, buf1, count1);
693 return drv->bdrv_pread(bs, offset, buf1, count1);
697 * Write with byte offsets (needed only for file protocols)
699 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
700 const void *buf1, int count1)
702 BlockDriver *drv = bs->drv;
706 if (!drv->bdrv_pwrite)
707 return bdrv_pwrite_em(bs, offset, buf1, count1);
708 return drv->bdrv_pwrite(bs, offset, buf1, count1);
712 * Truncate file to 'offset' bytes (needed only for file protocols)
714 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
716 BlockDriver *drv = bs->drv;
719 if (!drv->bdrv_truncate)
721 return drv->bdrv_truncate(bs, offset);
725 * Length of a file in bytes. Return < 0 if error or unknown.
727 int64_t bdrv_getlength(BlockDriverState *bs)
729 BlockDriver *drv = bs->drv;
732 if (!drv->bdrv_getlength) {
734 return bs->total_sectors * SECTOR_SIZE;
736 return drv->bdrv_getlength(bs);
739 /* return 0 as number of sectors if no device present or error */
740 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
743 length = bdrv_getlength(bs);
747 length = length >> SECTOR_BITS;
748 *nb_sectors_ptr = length;
751 /* force a given boot sector. */
752 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
754 bs->boot_sector_enabled = 1;
757 memcpy(bs->boot_sector_data, data, size);
758 memset(bs->boot_sector_data + size, 0, 512 - size);
761 void bdrv_set_geometry_hint(BlockDriverState *bs,
762 int cyls, int heads, int secs)
769 void bdrv_set_type_hint(BlockDriverState *bs, int type)
772 bs->removable = ((type == BDRV_TYPE_CDROM ||
773 type == BDRV_TYPE_FLOPPY));
776 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
778 bs->translation = translation;
781 void bdrv_get_geometry_hint(BlockDriverState *bs,
782 int *pcyls, int *pheads, int *psecs)
789 int bdrv_get_type_hint(BlockDriverState *bs)
794 int bdrv_get_translation_hint(BlockDriverState *bs)
796 return bs->translation;
799 int bdrv_is_removable(BlockDriverState *bs)
801 return bs->removable;
804 int bdrv_is_read_only(BlockDriverState *bs)
806 return bs->read_only;
809 int bdrv_is_sg(BlockDriverState *bs)
814 /* XXX: no longer used */
815 void bdrv_set_change_cb(BlockDriverState *bs,
816 void (*change_cb)(void *opaque), void *opaque)
818 bs->change_cb = change_cb;
819 bs->change_opaque = opaque;
822 int bdrv_is_encrypted(BlockDriverState *bs)
824 if (bs->backing_hd && bs->backing_hd->encrypted)
826 return bs->encrypted;
829 int bdrv_set_key(BlockDriverState *bs, const char *key)
832 if (bs->backing_hd && bs->backing_hd->encrypted) {
833 ret = bdrv_set_key(bs->backing_hd, key);
839 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
841 return bs->drv->bdrv_set_key(bs, key);
844 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
849 pstrcpy(buf, buf_size, bs->drv->format_name);
853 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
858 for (drv = first_drv; drv != NULL; drv = drv->next) {
859 it(opaque, drv->format_name);
863 BlockDriverState *bdrv_find(const char *name)
865 BlockDriverState *bs;
867 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
868 if (!strcmp(name, bs->device_name))
874 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
876 BlockDriverState *bs;
878 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
879 it(opaque, bs->device_name);
883 const char *bdrv_get_device_name(BlockDriverState *bs)
885 return bs->device_name;
888 void bdrv_flush(BlockDriverState *bs)
890 if (bs->drv->bdrv_flush)
891 bs->drv->bdrv_flush(bs);
893 bdrv_flush(bs->backing_hd);
897 * Returns true iff the specified sector is present in the disk image. Drivers
898 * not implementing the functionality are assumed to not support backing files,
899 * hence all their sectors are reported as allocated.
901 * 'pnum' is set to the number of sectors (including and immediately following
902 * the specified sector) that are known to be in the same
903 * allocated/unallocated state.
905 * 'nb_sectors' is the max value 'pnum' should be set to.
907 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
911 if (!bs->drv->bdrv_is_allocated) {
912 if (sector_num >= bs->total_sectors) {
916 n = bs->total_sectors - sector_num;
917 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
920 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
925 BlockDriverState *bs;
927 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
928 term_printf("%s:", bs->device_name);
929 term_printf(" type=");
934 case BDRV_TYPE_CDROM:
935 term_printf("cdrom");
937 case BDRV_TYPE_FLOPPY:
938 term_printf("floppy");
941 term_printf(" removable=%d", bs->removable);
943 term_printf(" locked=%d", bs->locked);
946 term_printf(" file=");
947 term_print_filename(bs->filename);
948 if (bs->backing_file[0] != '\0') {
949 term_printf(" backing_file=");
950 term_print_filename(bs->backing_file);
952 term_printf(" ro=%d", bs->read_only);
953 term_printf(" drv=%s", bs->drv->format_name);
955 term_printf(" encrypted");
957 term_printf(" [not inserted]");
963 /* The "info blockstats" command. */
964 void bdrv_info_stats (void)
966 BlockDriverState *bs;
968 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
972 " rd_operations=%" PRIu64
973 " wr_operations=%" PRIu64
976 bs->rd_bytes, bs->wr_bytes,
977 bs->rd_ops, bs->wr_ops);
981 void bdrv_get_backing_filename(BlockDriverState *bs,
982 char *filename, int filename_size)
984 if (!bs->backing_hd) {
985 pstrcpy(filename, filename_size, "");
987 pstrcpy(filename, filename_size, bs->backing_file);
991 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
992 const uint8_t *buf, int nb_sectors)
994 BlockDriver *drv = bs->drv;
997 if (!drv->bdrv_write_compressed)
999 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1002 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1004 BlockDriver *drv = bs->drv;
1007 if (!drv->bdrv_get_info)
1009 memset(bdi, 0, sizeof(*bdi));
1010 return drv->bdrv_get_info(bs, bdi);
1013 /**************************************************************/
1014 /* handling of snapshots */
1016 int bdrv_snapshot_create(BlockDriverState *bs,
1017 QEMUSnapshotInfo *sn_info)
1019 BlockDriver *drv = bs->drv;
1022 if (!drv->bdrv_snapshot_create)
1024 return drv->bdrv_snapshot_create(bs, sn_info);
1027 int bdrv_snapshot_goto(BlockDriverState *bs,
1028 const char *snapshot_id)
1030 BlockDriver *drv = bs->drv;
1033 if (!drv->bdrv_snapshot_goto)
1035 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1038 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1040 BlockDriver *drv = bs->drv;
1043 if (!drv->bdrv_snapshot_delete)
1045 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1048 int bdrv_snapshot_list(BlockDriverState *bs,
1049 QEMUSnapshotInfo **psn_info)
1051 BlockDriver *drv = bs->drv;
1054 if (!drv->bdrv_snapshot_list)
1056 return drv->bdrv_snapshot_list(bs, psn_info);
1059 #define NB_SUFFIXES 4
1061 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1063 static const char suffixes[NB_SUFFIXES] = "KMGT";
1068 snprintf(buf, buf_size, "%" PRId64, size);
1071 for(i = 0; i < NB_SUFFIXES; i++) {
1072 if (size < (10 * base)) {
1073 snprintf(buf, buf_size, "%0.1f%c",
1074 (double)size / base,
1077 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1078 snprintf(buf, buf_size, "%" PRId64 "%c",
1079 ((size + (base >> 1)) / base),
1089 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1091 char buf1[128], date_buf[128], clock_buf[128];
1101 snprintf(buf, buf_size,
1102 "%-10s%-20s%7s%20s%15s",
1103 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1107 ptm = localtime(&ti);
1108 strftime(date_buf, sizeof(date_buf),
1109 "%Y-%m-%d %H:%M:%S", ptm);
1111 localtime_r(&ti, &tm);
1112 strftime(date_buf, sizeof(date_buf),
1113 "%Y-%m-%d %H:%M:%S", &tm);
1115 secs = sn->vm_clock_nsec / 1000000000;
1116 snprintf(clock_buf, sizeof(clock_buf),
1117 "%02d:%02d:%02d.%03d",
1119 (int)((secs / 60) % 60),
1121 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1122 snprintf(buf, buf_size,
1123 "%-10s%-20s%7s%20s%15s",
1124 sn->id_str, sn->name,
1125 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1133 /**************************************************************/
1136 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1137 uint8_t *buf, int nb_sectors,
1138 BlockDriverCompletionFunc *cb, void *opaque)
1140 BlockDriver *drv = bs->drv;
1141 BlockDriverAIOCB *ret;
1146 /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1147 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1148 memcpy(buf, bs->boot_sector_data, 512);
1154 ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1157 /* Update stats even though technically transfer has not happened. */
1158 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1165 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1166 const uint8_t *buf, int nb_sectors,
1167 BlockDriverCompletionFunc *cb, void *opaque)
1169 BlockDriver *drv = bs->drv;
1170 BlockDriverAIOCB *ret;
1176 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1177 memcpy(bs->boot_sector_data, buf, 512);
1180 ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1183 /* Update stats even though technically transfer has not happened. */
1184 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1191 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1193 BlockDriver *drv = acb->bs->drv;
1195 drv->bdrv_aio_cancel(acb);
1199 /**************************************************************/
1200 /* async block device emulation */
1202 static void bdrv_aio_bh_cb(void *opaque)
1204 BlockDriverAIOCBSync *acb = opaque;
1205 acb->common.cb(acb->common.opaque, acb->ret);
1206 qemu_aio_release(acb);
1209 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1210 int64_t sector_num, uint8_t *buf, int nb_sectors,
1211 BlockDriverCompletionFunc *cb, void *opaque)
1213 BlockDriverAIOCBSync *acb;
1216 acb = qemu_aio_get(bs, cb, opaque);
1218 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1219 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1221 qemu_bh_schedule(acb->bh);
1222 return &acb->common;
1225 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1226 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1227 BlockDriverCompletionFunc *cb, void *opaque)
1229 BlockDriverAIOCBSync *acb;
1232 acb = qemu_aio_get(bs, cb, opaque);
1234 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1235 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1237 qemu_bh_schedule(acb->bh);
1238 return &acb->common;
1241 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1243 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1244 qemu_bh_cancel(acb->bh);
1245 qemu_aio_release(acb);
1248 /**************************************************************/
1249 /* sync block device emulation */
1251 static void bdrv_rw_em_cb(void *opaque, int ret)
1253 *(int *)opaque = ret;
1256 #define NOT_DONE 0x7fffffff
1258 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1259 uint8_t *buf, int nb_sectors)
1262 BlockDriverAIOCB *acb;
1264 async_ret = NOT_DONE;
1265 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1266 bdrv_rw_em_cb, &async_ret);
1270 while (async_ret == NOT_DONE) {
1277 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1278 const uint8_t *buf, int nb_sectors)
1281 BlockDriverAIOCB *acb;
1283 async_ret = NOT_DONE;
1284 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1285 bdrv_rw_em_cb, &async_ret);
1288 while (async_ret == NOT_DONE) {
1294 void bdrv_init(void)
1296 bdrv_register(&bdrv_raw);
1297 bdrv_register(&bdrv_host_device);
1299 bdrv_register(&bdrv_cow);
1301 bdrv_register(&bdrv_qcow);
1302 bdrv_register(&bdrv_vmdk);
1303 bdrv_register(&bdrv_cloop);
1304 bdrv_register(&bdrv_dmg);
1305 bdrv_register(&bdrv_bochs);
1306 bdrv_register(&bdrv_vpc);
1307 bdrv_register(&bdrv_vvfat);
1308 bdrv_register(&bdrv_qcow2);
1309 bdrv_register(&bdrv_parallels);
1310 bdrv_register(&bdrv_nbd);
1315 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1319 BlockDriverAIOCB *acb;
1322 if (drv->free_aiocb) {
1323 acb = drv->free_aiocb;
1324 drv->free_aiocb = acb->next;
1326 acb = qemu_mallocz(drv->aiocb_size);
1332 acb->opaque = opaque;
1336 void qemu_aio_release(void *p)
1338 BlockDriverAIOCB *acb = p;
1339 BlockDriver *drv = acb->bs->drv;
1340 acb->next = drv->free_aiocb;
1341 drv->free_aiocb = acb;
1344 /**************************************************************/
1345 /* removable device support */
1348 * Return TRUE if the media is present
1350 int bdrv_is_inserted(BlockDriverState *bs)
1352 BlockDriver *drv = bs->drv;
1356 if (!drv->bdrv_is_inserted)
1358 ret = drv->bdrv_is_inserted(bs);
1363 * Return TRUE if the media changed since the last call to this
1364 * function. It is currently only used for floppy disks
1366 int bdrv_media_changed(BlockDriverState *bs)
1368 BlockDriver *drv = bs->drv;
1371 if (!drv || !drv->bdrv_media_changed)
1374 ret = drv->bdrv_media_changed(bs);
1375 if (ret == -ENOTSUP)
1376 ret = bs->media_changed;
1377 bs->media_changed = 0;
1382 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1384 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1386 BlockDriver *drv = bs->drv;
1389 if (!drv || !drv->bdrv_eject) {
1392 ret = drv->bdrv_eject(bs, eject_flag);
1394 if (ret == -ENOTSUP) {
1400 int bdrv_is_locked(BlockDriverState *bs)
1406 * Lock or unlock the media (if it is locked, the user won't be able
1407 * to eject it manually).
1409 void bdrv_set_locked(BlockDriverState *bs, int locked)
1411 BlockDriver *drv = bs->drv;
1413 bs->locked = locked;
1414 if (drv && drv->bdrv_set_locked) {
1415 drv->bdrv_set_locked(bs, locked);
1419 /* needed for generic scsi interface */
1421 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1423 BlockDriver *drv = bs->drv;
1425 if (drv && drv->bdrv_ioctl)
1426 return drv->bdrv_ioctl(bs, req, buf);