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"
28 #include "block_int.h"
31 #include <sys/types.h>
33 #include <sys/ioctl.h>
34 #include <sys/queue.h>
39 #define SECTOR_SIZE (1 << SECTOR_BITS)
41 typedef struct BlockDriverAIOCBSync {
42 BlockDriverAIOCB common;
45 } BlockDriverAIOCBSync;
47 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
48 int64_t sector_num, uint8_t *buf, int nb_sectors,
49 BlockDriverCompletionFunc *cb, void *opaque);
50 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
51 int64_t sector_num, const uint8_t *buf, int nb_sectors,
52 BlockDriverCompletionFunc *cb, void *opaque);
53 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
54 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
55 uint8_t *buf, int nb_sectors);
56 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
57 const uint8_t *buf, int nb_sectors);
59 static BlockDriver *first_drv;
61 int path_is_absolute(const char *path)
65 /* specific case for names like: "\\.\d:" */
66 if (*path == '/' || *path == '\\')
69 p = strchr(path, ':');
75 return (*p == '/' || *p == '\\');
81 /* if filename is absolute, just copy it to dest. Otherwise, build a
82 path to it by considering it is relative to base_path. URL are
84 void path_combine(char *dest, int dest_size,
85 const char *base_path,
93 if (path_is_absolute(filename)) {
94 pstrcpy(dest, dest_size, filename);
96 p = strchr(base_path, ':');
101 p1 = strrchr(base_path, '/');
105 p2 = strrchr(base_path, '\\');
117 if (len > dest_size - 1)
119 memcpy(dest, base_path, len);
121 pstrcat(dest, dest_size, filename);
126 static void bdrv_register(BlockDriver *bdrv)
128 if (!bdrv->bdrv_aio_read) {
129 /* add AIO emulation layer */
130 bdrv->bdrv_aio_read = bdrv_aio_read_em;
131 bdrv->bdrv_aio_write = bdrv_aio_write_em;
132 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
133 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
134 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
135 /* add synchronous IO emulation layer */
136 bdrv->bdrv_read = bdrv_read_em;
137 bdrv->bdrv_write = bdrv_write_em;
139 bdrv->next = first_drv;
143 /* create a new block device (by default it is empty) */
144 BlockDriverState *bdrv_new(const char *device_name)
146 BlockDriverState **pbs, *bs;
148 bs = qemu_mallocz(sizeof(BlockDriverState));
151 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
152 if (device_name[0] != '\0') {
153 /* insert at the end */
162 BlockDriver *bdrv_find_format(const char *format_name)
165 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
166 if (!strcmp(drv1->format_name, format_name))
172 int bdrv_create(BlockDriver *drv,
173 const char *filename, int64_t size_in_sectors,
174 const char *backing_file, int flags)
176 if (!drv->bdrv_create)
178 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
182 void get_tmp_filename(char *filename, int size)
184 char temp_dir[MAX_PATH];
186 GetTempPath(MAX_PATH, temp_dir);
187 GetTempFileName(temp_dir, "qem", 0, filename);
190 void get_tmp_filename(char *filename, int size)
194 /* XXX: race condition possible */
195 tmpdir = getenv("TMPDIR");
198 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
199 fd = mkstemp(filename);
205 static int is_windows_drive_prefix(const char *filename)
207 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
208 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
212 static int is_windows_drive(const char *filename)
214 if (is_windows_drive_prefix(filename) &&
217 if (strstart(filename, "\\\\.\\", NULL) ||
218 strstart(filename, "//./", NULL))
224 static BlockDriver *find_protocol(const char *filename)
232 if (is_windows_drive(filename) ||
233 is_windows_drive_prefix(filename))
236 p = strchr(filename, ':');
240 if (len > sizeof(protocol) - 1)
241 len = sizeof(protocol) - 1;
242 memcpy(protocol, filename, len);
243 protocol[len] = '\0';
244 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
245 if (drv1->protocol_name &&
246 !strcmp(drv1->protocol_name, protocol))
252 /* XXX: force raw format if block or character device ? It would
253 simplify the BSD case */
254 static BlockDriver *find_image_format(const char *filename)
256 int ret, score, score_max;
257 BlockDriver *drv1, *drv;
259 BlockDriverState *bs;
261 /* detect host devices. By convention, /dev/cdrom[N] is always
262 recognized as a host CDROM */
263 if (strstart(filename, "/dev/cdrom", NULL))
264 return &bdrv_host_device;
266 if (is_windows_drive(filename))
267 return &bdrv_host_device;
271 if (stat(filename, &st) >= 0 &&
272 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
273 return &bdrv_host_device;
278 drv = find_protocol(filename);
279 /* no need to test disk image formats for vvfat */
280 if (drv == &bdrv_vvfat)
283 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
286 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
293 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
294 if (drv1->bdrv_probe) {
295 score = drv1->bdrv_probe(buf, ret, filename);
296 if (score > score_max) {
305 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
307 BlockDriverState *bs;
313 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
322 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
324 return bdrv_open2(bs, filename, flags, NULL);
327 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
331 char tmp_filename[PATH_MAX];
332 char backing_filename[PATH_MAX];
335 bs->is_temporary = 0;
338 if (flags & BDRV_O_SNAPSHOT) {
339 BlockDriverState *bs1;
343 /* if snapshot, we create a temporary backing file and open it
344 instead of opening 'filename' directly */
346 /* if there is a backing file, use it */
351 if (bdrv_open(bs1, filename, 0) < 0) {
355 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
357 if (bs1->drv && bs1->drv->protocol_name)
362 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
364 /* Real path is meaningless for protocols */
366 snprintf(backing_filename, sizeof(backing_filename),
369 realpath(filename, backing_filename);
371 if (bdrv_create(&bdrv_qcow2, tmp_filename,
372 total_size, backing_filename, 0) < 0) {
375 filename = tmp_filename;
376 bs->is_temporary = 1;
379 pstrcpy(bs->filename, sizeof(bs->filename), filename);
380 if (flags & BDRV_O_FILE) {
381 drv = find_protocol(filename);
386 drv = find_image_format(filename);
392 bs->opaque = qemu_mallocz(drv->instance_size);
393 if (bs->opaque == NULL && drv->instance_size > 0)
395 /* Note: for compatibility, we open disk image files as RDWR, and
396 RDONLY as fallback */
397 if (!(flags & BDRV_O_FILE))
398 open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT);
400 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
401 ret = drv->bdrv_open(bs, filename, open_flags);
402 if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
403 ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
407 qemu_free(bs->opaque);
412 if (drv->bdrv_getlength) {
413 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
416 if (bs->is_temporary) {
420 if (bs->backing_file[0] != '\0') {
421 /* if there is a backing file, use it */
422 bs->backing_hd = bdrv_new("");
423 if (!bs->backing_hd) {
428 path_combine(backing_filename, sizeof(backing_filename),
429 filename, bs->backing_file);
430 if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
434 /* call the change callback */
435 bs->media_changed = 1;
437 bs->change_cb(bs->change_opaque);
442 void bdrv_close(BlockDriverState *bs)
446 bdrv_delete(bs->backing_hd);
447 bs->drv->bdrv_close(bs);
448 qemu_free(bs->opaque);
450 if (bs->is_temporary) {
451 unlink(bs->filename);
457 /* call the change callback */
458 bs->media_changed = 1;
460 bs->change_cb(bs->change_opaque);
464 void bdrv_delete(BlockDriverState *bs)
466 BlockDriverState **pbs;
469 while (*pbs != bs && *pbs != NULL)
478 /* commit COW file into the raw image */
479 int bdrv_commit(BlockDriverState *bs)
481 BlockDriver *drv = bs->drv;
482 int64_t i, total_sectors;
484 unsigned char sector[512];
493 if (!bs->backing_hd) {
497 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
498 for (i = 0; i < total_sectors;) {
499 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
500 for(j = 0; j < n; j++) {
501 if (bdrv_read(bs, i, sector, 1) != 0) {
505 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
515 if (drv->bdrv_make_empty)
516 return drv->bdrv_make_empty(bs);
521 /* return < 0 if error. See bdrv_write() for the return codes */
522 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
523 uint8_t *buf, int nb_sectors)
525 BlockDriver *drv = bs->drv;
530 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
531 memcpy(buf, bs->boot_sector_data, 512);
538 if (drv->bdrv_pread) {
540 len = nb_sectors * 512;
541 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
547 bs->rd_bytes += (unsigned) len;
552 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
556 /* Return < 0 if error. Important errors are:
557 -EIO generic I/O error (may happen for all errors)
558 -ENOMEDIUM No media inserted.
559 -EINVAL Invalid sector number or nb_sectors
560 -EACCES Trying to write a read-only device
562 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
563 const uint8_t *buf, int nb_sectors)
565 BlockDriver *drv = bs->drv;
570 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
571 memcpy(bs->boot_sector_data, buf, 512);
573 if (drv->bdrv_pwrite) {
575 len = nb_sectors * 512;
576 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
582 bs->wr_bytes += (unsigned) len;
587 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
591 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
592 uint8_t *buf, int count1)
594 uint8_t tmp_buf[SECTOR_SIZE];
595 int len, nb_sectors, count;
599 /* first read to align to sector start */
600 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
603 sector_num = offset >> SECTOR_BITS;
605 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
607 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
615 /* read the sectors "in place" */
616 nb_sectors = count >> SECTOR_BITS;
617 if (nb_sectors > 0) {
618 if (bdrv_read(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(buf, tmp_buf, count);
635 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
636 const uint8_t *buf, int count1)
638 uint8_t tmp_buf[SECTOR_SIZE];
639 int len, nb_sectors, count;
643 /* first write to align to sector start */
644 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
647 sector_num = offset >> SECTOR_BITS;
649 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
651 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
652 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
661 /* write the sectors "in place" */
662 nb_sectors = count >> SECTOR_BITS;
663 if (nb_sectors > 0) {
664 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
666 sector_num += nb_sectors;
667 len = nb_sectors << SECTOR_BITS;
672 /* add data from the last sector */
674 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
676 memcpy(tmp_buf, buf, count);
677 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
684 * Read with byte offsets (needed only for file protocols)
686 int bdrv_pread(BlockDriverState *bs, int64_t offset,
687 void *buf1, int count1)
689 BlockDriver *drv = bs->drv;
693 if (!drv->bdrv_pread)
694 return bdrv_pread_em(bs, offset, buf1, count1);
695 return drv->bdrv_pread(bs, offset, buf1, count1);
699 * Write with byte offsets (needed only for file protocols)
701 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
702 const void *buf1, int count1)
704 BlockDriver *drv = bs->drv;
708 if (!drv->bdrv_pwrite)
709 return bdrv_pwrite_em(bs, offset, buf1, count1);
710 return drv->bdrv_pwrite(bs, offset, buf1, count1);
714 * Truncate file to 'offset' bytes (needed only for file protocols)
716 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
718 BlockDriver *drv = bs->drv;
721 if (!drv->bdrv_truncate)
723 return drv->bdrv_truncate(bs, offset);
727 * Length of a file in bytes. Return < 0 if error or unknown.
729 int64_t bdrv_getlength(BlockDriverState *bs)
731 BlockDriver *drv = bs->drv;
734 if (!drv->bdrv_getlength) {
736 return bs->total_sectors * SECTOR_SIZE;
738 return drv->bdrv_getlength(bs);
741 /* return 0 as number of sectors if no device present or error */
742 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
745 length = bdrv_getlength(bs);
749 length = length >> SECTOR_BITS;
750 *nb_sectors_ptr = length;
753 /* force a given boot sector. */
754 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
756 bs->boot_sector_enabled = 1;
759 memcpy(bs->boot_sector_data, data, size);
760 memset(bs->boot_sector_data + size, 0, 512 - size);
763 void bdrv_set_geometry_hint(BlockDriverState *bs,
764 int cyls, int heads, int secs)
771 void bdrv_set_type_hint(BlockDriverState *bs, int type)
774 bs->removable = ((type == BDRV_TYPE_CDROM ||
775 type == BDRV_TYPE_FLOPPY));
778 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
780 bs->translation = translation;
783 void bdrv_get_geometry_hint(BlockDriverState *bs,
784 int *pcyls, int *pheads, int *psecs)
791 int bdrv_get_type_hint(BlockDriverState *bs)
796 int bdrv_get_translation_hint(BlockDriverState *bs)
798 return bs->translation;
801 int bdrv_is_removable(BlockDriverState *bs)
803 return bs->removable;
806 int bdrv_is_read_only(BlockDriverState *bs)
808 return bs->read_only;
811 int bdrv_is_sg(BlockDriverState *bs)
816 /* XXX: no longer used */
817 void bdrv_set_change_cb(BlockDriverState *bs,
818 void (*change_cb)(void *opaque), void *opaque)
820 bs->change_cb = change_cb;
821 bs->change_opaque = opaque;
824 int bdrv_is_encrypted(BlockDriverState *bs)
826 if (bs->backing_hd && bs->backing_hd->encrypted)
828 return bs->encrypted;
831 int bdrv_set_key(BlockDriverState *bs, const char *key)
834 if (bs->backing_hd && bs->backing_hd->encrypted) {
835 ret = bdrv_set_key(bs->backing_hd, key);
841 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
843 return bs->drv->bdrv_set_key(bs, key);
846 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
851 pstrcpy(buf, buf_size, bs->drv->format_name);
855 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
860 for (drv = first_drv; drv != NULL; drv = drv->next) {
861 it(opaque, drv->format_name);
865 BlockDriverState *bdrv_find(const char *name)
867 BlockDriverState *bs;
869 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
870 if (!strcmp(name, bs->device_name))
876 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
878 BlockDriverState *bs;
880 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
881 it(opaque, bs->device_name);
885 const char *bdrv_get_device_name(BlockDriverState *bs)
887 return bs->device_name;
890 void bdrv_flush(BlockDriverState *bs)
892 if (bs->drv->bdrv_flush)
893 bs->drv->bdrv_flush(bs);
895 bdrv_flush(bs->backing_hd);
899 * Returns true iff the specified sector is present in the disk image. Drivers
900 * not implementing the functionality are assumed to not support backing files,
901 * hence all their sectors are reported as allocated.
903 * 'pnum' is set to the number of sectors (including and immediately following
904 * the specified sector) that are known to be in the same
905 * allocated/unallocated state.
907 * 'nb_sectors' is the max value 'pnum' should be set to.
909 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
913 if (!bs->drv->bdrv_is_allocated) {
914 if (sector_num >= bs->total_sectors) {
918 n = bs->total_sectors - sector_num;
919 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
922 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
928 BlockDriverState *bs;
930 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
931 term_printf("%s:", bs->device_name);
932 term_printf(" type=");
937 case BDRV_TYPE_CDROM:
938 term_printf("cdrom");
940 case BDRV_TYPE_FLOPPY:
941 term_printf("floppy");
944 term_printf(" removable=%d", bs->removable);
946 term_printf(" locked=%d", bs->locked);
949 term_printf(" file=");
950 term_print_filename(bs->filename);
951 if (bs->backing_file[0] != '\0') {
952 term_printf(" backing_file=");
953 term_print_filename(bs->backing_file);
955 term_printf(" ro=%d", bs->read_only);
956 term_printf(" drv=%s", bs->drv->format_name);
958 term_printf(" encrypted");
960 term_printf(" [not inserted]");
966 /* The "info blockstats" command. */
967 void bdrv_info_stats (void)
969 BlockDriverState *bs;
971 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
975 " rd_operations=%" PRIu64
976 " wr_operations=%" PRIu64
979 bs->rd_bytes, bs->wr_bytes,
980 bs->rd_ops, bs->wr_ops);
985 void bdrv_get_backing_filename(BlockDriverState *bs,
986 char *filename, int filename_size)
988 if (!bs->backing_hd) {
989 pstrcpy(filename, filename_size, "");
991 pstrcpy(filename, filename_size, bs->backing_file);
995 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
996 const uint8_t *buf, int nb_sectors)
998 BlockDriver *drv = bs->drv;
1001 if (!drv->bdrv_write_compressed)
1003 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1006 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1008 BlockDriver *drv = bs->drv;
1011 if (!drv->bdrv_get_info)
1013 memset(bdi, 0, sizeof(*bdi));
1014 return drv->bdrv_get_info(bs, bdi);
1017 /**************************************************************/
1018 /* handling of snapshots */
1020 int bdrv_snapshot_create(BlockDriverState *bs,
1021 QEMUSnapshotInfo *sn_info)
1023 BlockDriver *drv = bs->drv;
1026 if (!drv->bdrv_snapshot_create)
1028 return drv->bdrv_snapshot_create(bs, sn_info);
1031 int bdrv_snapshot_goto(BlockDriverState *bs,
1032 const char *snapshot_id)
1034 BlockDriver *drv = bs->drv;
1037 if (!drv->bdrv_snapshot_goto)
1039 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1042 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1044 BlockDriver *drv = bs->drv;
1047 if (!drv->bdrv_snapshot_delete)
1049 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1052 int bdrv_snapshot_list(BlockDriverState *bs,
1053 QEMUSnapshotInfo **psn_info)
1055 BlockDriver *drv = bs->drv;
1058 if (!drv->bdrv_snapshot_list)
1060 return drv->bdrv_snapshot_list(bs, psn_info);
1063 #define NB_SUFFIXES 4
1065 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1067 static const char suffixes[NB_SUFFIXES] = "KMGT";
1072 snprintf(buf, buf_size, "%" PRId64, size);
1075 for(i = 0; i < NB_SUFFIXES; i++) {
1076 if (size < (10 * base)) {
1077 snprintf(buf, buf_size, "%0.1f%c",
1078 (double)size / base,
1081 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1082 snprintf(buf, buf_size, "%" PRId64 "%c",
1083 ((size + (base >> 1)) / base),
1093 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1095 char buf1[128], date_buf[128], clock_buf[128];
1105 snprintf(buf, buf_size,
1106 "%-10s%-20s%7s%20s%15s",
1107 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1111 ptm = localtime(&ti);
1112 strftime(date_buf, sizeof(date_buf),
1113 "%Y-%m-%d %H:%M:%S", ptm);
1115 localtime_r(&ti, &tm);
1116 strftime(date_buf, sizeof(date_buf),
1117 "%Y-%m-%d %H:%M:%S", &tm);
1119 secs = sn->vm_clock_nsec / 1000000000;
1120 snprintf(clock_buf, sizeof(clock_buf),
1121 "%02d:%02d:%02d.%03d",
1123 (int)((secs / 60) % 60),
1125 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1126 snprintf(buf, buf_size,
1127 "%-10s%-20s%7s%20s%15s",
1128 sn->id_str, sn->name,
1129 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1137 /**************************************************************/
1140 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1141 uint8_t *buf, int nb_sectors,
1142 BlockDriverCompletionFunc *cb, void *opaque)
1144 BlockDriver *drv = bs->drv;
1145 BlockDriverAIOCB *ret;
1150 /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1151 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1152 memcpy(buf, bs->boot_sector_data, 512);
1158 ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1161 /* Update stats even though technically transfer has not happened. */
1162 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1169 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1170 const uint8_t *buf, int nb_sectors,
1171 BlockDriverCompletionFunc *cb, void *opaque)
1173 BlockDriver *drv = bs->drv;
1174 BlockDriverAIOCB *ret;
1180 if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1181 memcpy(bs->boot_sector_data, buf, 512);
1184 ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1187 /* Update stats even though technically transfer has not happened. */
1188 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1195 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1197 BlockDriver *drv = acb->bs->drv;
1199 drv->bdrv_aio_cancel(acb);
1203 /**************************************************************/
1204 /* async block device emulation */
1207 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1208 int64_t sector_num, uint8_t *buf, int nb_sectors,
1209 BlockDriverCompletionFunc *cb, void *opaque)
1212 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1217 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1218 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1219 BlockDriverCompletionFunc *cb, void *opaque)
1222 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1227 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
1231 static void bdrv_aio_bh_cb(void *opaque)
1233 BlockDriverAIOCBSync *acb = opaque;
1234 acb->common.cb(acb->common.opaque, acb->ret);
1235 qemu_aio_release(acb);
1238 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1239 int64_t sector_num, uint8_t *buf, int nb_sectors,
1240 BlockDriverCompletionFunc *cb, void *opaque)
1242 BlockDriverAIOCBSync *acb;
1245 acb = qemu_aio_get(bs, cb, opaque);
1247 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1248 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1250 qemu_bh_schedule(acb->bh);
1251 return &acb->common;
1254 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1255 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1256 BlockDriverCompletionFunc *cb, void *opaque)
1258 BlockDriverAIOCBSync *acb;
1261 acb = qemu_aio_get(bs, cb, opaque);
1263 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1264 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1266 qemu_bh_schedule(acb->bh);
1267 return &acb->common;
1270 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1272 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1273 qemu_bh_cancel(acb->bh);
1274 qemu_aio_release(acb);
1276 #endif /* !QEMU_IMG */
1278 /**************************************************************/
1279 /* sync block device emulation */
1281 static void bdrv_rw_em_cb(void *opaque, int ret)
1283 *(int *)opaque = ret;
1286 #define NOT_DONE 0x7fffffff
1288 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1289 uint8_t *buf, int nb_sectors)
1292 BlockDriverAIOCB *acb;
1294 async_ret = NOT_DONE;
1295 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1296 bdrv_rw_em_cb, &async_ret);
1300 while (async_ret == NOT_DONE) {
1307 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1308 const uint8_t *buf, int nb_sectors)
1311 BlockDriverAIOCB *acb;
1313 async_ret = NOT_DONE;
1314 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1315 bdrv_rw_em_cb, &async_ret);
1318 while (async_ret == NOT_DONE) {
1324 void bdrv_init(void)
1326 bdrv_register(&bdrv_raw);
1327 bdrv_register(&bdrv_host_device);
1329 bdrv_register(&bdrv_cow);
1331 bdrv_register(&bdrv_qcow);
1332 bdrv_register(&bdrv_vmdk);
1333 bdrv_register(&bdrv_cloop);
1334 bdrv_register(&bdrv_dmg);
1335 bdrv_register(&bdrv_bochs);
1336 bdrv_register(&bdrv_vpc);
1337 bdrv_register(&bdrv_vvfat);
1338 bdrv_register(&bdrv_qcow2);
1339 bdrv_register(&bdrv_parallels);
1341 bdrv_register(&bdrv_nbd);
1347 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1351 BlockDriverAIOCB *acb;
1354 if (drv->free_aiocb) {
1355 acb = drv->free_aiocb;
1356 drv->free_aiocb = acb->next;
1358 acb = qemu_mallocz(drv->aiocb_size);
1364 acb->opaque = opaque;
1368 void qemu_aio_release(void *p)
1370 BlockDriverAIOCB *acb = p;
1371 BlockDriver *drv = acb->bs->drv;
1372 acb->next = drv->free_aiocb;
1373 drv->free_aiocb = acb;
1376 /**************************************************************/
1377 /* removable device support */
1380 * Return TRUE if the media is present
1382 int bdrv_is_inserted(BlockDriverState *bs)
1384 BlockDriver *drv = bs->drv;
1388 if (!drv->bdrv_is_inserted)
1390 ret = drv->bdrv_is_inserted(bs);
1395 * Return TRUE if the media changed since the last call to this
1396 * function. It is currently only used for floppy disks
1398 int bdrv_media_changed(BlockDriverState *bs)
1400 BlockDriver *drv = bs->drv;
1403 if (!drv || !drv->bdrv_media_changed)
1406 ret = drv->bdrv_media_changed(bs);
1407 if (ret == -ENOTSUP)
1408 ret = bs->media_changed;
1409 bs->media_changed = 0;
1414 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1416 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1418 BlockDriver *drv = bs->drv;
1421 if (!drv || !drv->bdrv_eject) {
1424 ret = drv->bdrv_eject(bs, eject_flag);
1426 if (ret == -ENOTSUP) {
1432 int bdrv_is_locked(BlockDriverState *bs)
1438 * Lock or unlock the media (if it is locked, the user won't be able
1439 * to eject it manually).
1441 void bdrv_set_locked(BlockDriverState *bs, int locked)
1443 BlockDriver *drv = bs->drv;
1445 bs->locked = locked;
1446 if (drv && drv->bdrv_set_locked) {
1447 drv->bdrv_set_locked(bs, locked);
1451 /* needed for generic scsi interface */
1453 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1455 BlockDriver *drv = bs->drv;
1457 if (drv && drv->bdrv_ioctl)
1458 return drv->bdrv_ioctl(bs, req, buf);