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 "config-host.h"
26 /* include native header before sys-queue.h */
27 #include <sys/queue.h>
30 #include "qemu-common.h"
32 #include "block_int.h"
35 #include <sys/types.h>
37 #include <sys/ioctl.h>
48 #define SECTOR_SIZE (1 << SECTOR_BITS)
50 static AIOPool vectored_aio_pool;
52 typedef struct BlockDriverAIOCBSync {
53 BlockDriverAIOCB common;
56 } BlockDriverAIOCBSync;
58 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
59 int64_t sector_num, uint8_t *buf, int nb_sectors,
60 BlockDriverCompletionFunc *cb, void *opaque);
61 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
62 int64_t sector_num, const uint8_t *buf, int nb_sectors,
63 BlockDriverCompletionFunc *cb, void *opaque);
64 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
65 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
66 uint8_t *buf, int nb_sectors);
67 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
68 const uint8_t *buf, int nb_sectors);
70 BlockDriverState *bdrv_first;
72 static BlockDriver *first_drv;
74 int path_is_absolute(const char *path)
78 /* specific case for names like: "\\.\d:" */
79 if (*path == '/' || *path == '\\')
82 p = strchr(path, ':');
88 return (*p == '/' || *p == '\\');
94 /* if filename is absolute, just copy it to dest. Otherwise, build a
95 path to it by considering it is relative to base_path. URL are
97 void path_combine(char *dest, int dest_size,
98 const char *base_path,
106 if (path_is_absolute(filename)) {
107 pstrcpy(dest, dest_size, filename);
109 p = strchr(base_path, ':');
114 p1 = strrchr(base_path, '/');
118 p2 = strrchr(base_path, '\\');
130 if (len > dest_size - 1)
132 memcpy(dest, base_path, len);
134 pstrcat(dest, dest_size, filename);
139 static void bdrv_register(BlockDriver *bdrv)
141 if (!bdrv->bdrv_aio_read) {
142 /* add AIO emulation layer */
143 bdrv->bdrv_aio_read = bdrv_aio_read_em;
144 bdrv->bdrv_aio_write = bdrv_aio_write_em;
145 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
146 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
147 } else if (!bdrv->bdrv_read) {
148 /* add synchronous IO emulation layer */
149 bdrv->bdrv_read = bdrv_read_em;
150 bdrv->bdrv_write = bdrv_write_em;
152 aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel);
153 bdrv->next = first_drv;
157 /* create a new block device (by default it is empty) */
158 BlockDriverState *bdrv_new(const char *device_name)
160 BlockDriverState **pbs, *bs;
162 bs = qemu_mallocz(sizeof(BlockDriverState));
163 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
164 if (device_name[0] != '\0') {
165 /* insert at the end */
174 BlockDriver *bdrv_find_format(const char *format_name)
177 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
178 if (!strcmp(drv1->format_name, format_name))
184 int bdrv_create2(BlockDriver *drv,
185 const char *filename, int64_t size_in_sectors,
186 const char *backing_file, const char *backing_format,
189 if (drv->bdrv_create2)
190 return drv->bdrv_create2(filename, size_in_sectors, backing_file,
191 backing_format, flags);
192 if (drv->bdrv_create)
193 return drv->bdrv_create(filename, size_in_sectors, backing_file,
198 int bdrv_create(BlockDriver *drv,
199 const char *filename, int64_t size_in_sectors,
200 const char *backing_file, int flags)
202 if (!drv->bdrv_create)
204 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
208 void get_tmp_filename(char *filename, int size)
210 char temp_dir[MAX_PATH];
212 GetTempPath(MAX_PATH, temp_dir);
213 GetTempFileName(temp_dir, "qem", 0, filename);
216 void get_tmp_filename(char *filename, int size)
220 /* XXX: race condition possible */
221 tmpdir = getenv("TMPDIR");
224 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
225 fd = mkstemp(filename);
231 static int is_windows_drive_prefix(const char *filename)
233 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
234 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
238 static int is_windows_drive(const char *filename)
240 if (is_windows_drive_prefix(filename) &&
243 if (strstart(filename, "\\\\.\\", NULL) ||
244 strstart(filename, "//./", NULL))
250 static BlockDriver *find_protocol(const char *filename)
258 if (is_windows_drive(filename) ||
259 is_windows_drive_prefix(filename))
262 p = strchr(filename, ':');
266 if (len > sizeof(protocol) - 1)
267 len = sizeof(protocol) - 1;
268 memcpy(protocol, filename, len);
269 protocol[len] = '\0';
270 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
271 if (drv1->protocol_name &&
272 !strcmp(drv1->protocol_name, protocol))
278 /* XXX: force raw format if block or character device ? It would
279 simplify the BSD case */
280 static BlockDriver *find_image_format(const char *filename)
282 int ret, score, score_max;
283 BlockDriver *drv1, *drv;
285 BlockDriverState *bs;
287 /* detect host devices. By convention, /dev/cdrom[N] is always
288 recognized as a host CDROM */
289 if (strstart(filename, "/dev/cdrom", NULL))
290 return &bdrv_host_device;
292 if (is_windows_drive(filename))
293 return &bdrv_host_device;
297 if (stat(filename, &st) >= 0 &&
298 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
299 return &bdrv_host_device;
304 drv = find_protocol(filename);
305 /* no need to test disk image formats for vvfat */
306 if (drv == &bdrv_vvfat)
309 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
312 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
319 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
320 if (drv1->bdrv_probe) {
321 score = drv1->bdrv_probe(buf, ret, filename);
322 if (score > score_max) {
331 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
333 BlockDriverState *bs;
337 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
347 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
349 return bdrv_open2(bs, filename, flags, NULL);
352 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
356 char tmp_filename[PATH_MAX];
357 char backing_filename[PATH_MAX];
360 bs->is_temporary = 0;
364 if (flags & BDRV_O_SNAPSHOT) {
365 BlockDriverState *bs1;
369 /* if snapshot, we create a temporary backing file and open it
370 instead of opening 'filename' directly */
372 /* if there is a backing file, use it */
374 ret = bdrv_open2(bs1, filename, 0, drv);
379 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
381 if (bs1->drv && bs1->drv->protocol_name)
386 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
388 /* Real path is meaningless for protocols */
390 snprintf(backing_filename, sizeof(backing_filename),
393 realpath(filename, backing_filename);
395 ret = bdrv_create2(&bdrv_qcow2, tmp_filename,
396 total_size, backing_filename,
397 (drv ? drv->format_name : NULL), 0);
401 filename = tmp_filename;
403 bs->is_temporary = 1;
406 pstrcpy(bs->filename, sizeof(bs->filename), filename);
407 if (flags & BDRV_O_FILE) {
408 drv = find_protocol(filename);
410 drv = find_image_format(filename);
414 goto unlink_and_fail;
417 bs->opaque = qemu_mallocz(drv->instance_size);
418 /* Note: for compatibility, we open disk image files as RDWR, and
419 RDONLY as fallback */
420 if (!(flags & BDRV_O_FILE))
421 open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
423 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
424 ret = drv->bdrv_open(bs, filename, open_flags);
425 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
426 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
430 qemu_free(bs->opaque);
434 if (bs->is_temporary)
438 if (drv->bdrv_getlength) {
439 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
442 if (bs->is_temporary) {
446 if (bs->backing_file[0] != '\0') {
447 /* if there is a backing file, use it */
448 BlockDriver *back_drv = NULL;
449 bs->backing_hd = bdrv_new("");
450 path_combine(backing_filename, sizeof(backing_filename),
451 filename, bs->backing_file);
452 if (bs->backing_format[0] != '\0')
453 back_drv = bdrv_find_format(bs->backing_format);
454 ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
462 if (!bdrv_key_required(bs)) {
463 /* call the change callback */
464 bs->media_changed = 1;
466 bs->change_cb(bs->change_opaque);
471 void bdrv_close(BlockDriverState *bs)
475 bdrv_delete(bs->backing_hd);
476 bs->drv->bdrv_close(bs);
477 qemu_free(bs->opaque);
479 if (bs->is_temporary) {
480 unlink(bs->filename);
486 /* call the change callback */
487 bs->media_changed = 1;
489 bs->change_cb(bs->change_opaque);
493 void bdrv_delete(BlockDriverState *bs)
495 BlockDriverState **pbs;
498 while (*pbs != bs && *pbs != NULL)
507 /* commit COW file into the raw image */
508 int bdrv_commit(BlockDriverState *bs)
510 BlockDriver *drv = bs->drv;
511 int64_t i, total_sectors;
513 unsigned char sector[512];
522 if (!bs->backing_hd) {
526 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
527 for (i = 0; i < total_sectors;) {
528 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
529 for(j = 0; j < n; j++) {
530 if (bdrv_read(bs, i, sector, 1) != 0) {
534 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
544 if (drv->bdrv_make_empty)
545 return drv->bdrv_make_empty(bs);
550 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
555 if (!bdrv_is_inserted(bs))
561 len = bdrv_getlength(bs);
563 if ((offset + size) > len)
569 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
574 /* Deal with byte accesses */
576 offset = -sector_num;
578 offset = sector_num * 512;
580 return bdrv_check_byte_request(bs, offset, nb_sectors * 512);
583 /* return < 0 if error. See bdrv_write() for the return codes */
584 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
585 uint8_t *buf, int nb_sectors)
587 BlockDriver *drv = bs->drv;
591 if (bdrv_check_request(bs, sector_num, nb_sectors))
594 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
597 /* Return < 0 if error. Important errors are:
598 -EIO generic I/O error (may happen for all errors)
599 -ENOMEDIUM No media inserted.
600 -EINVAL Invalid sector number or nb_sectors
601 -EACCES Trying to write a read-only device
603 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
604 const uint8_t *buf, int nb_sectors)
606 BlockDriver *drv = bs->drv;
611 if (bdrv_check_request(bs, sector_num, nb_sectors))
614 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
617 int bdrv_pread(BlockDriverState *bs, int64_t offset,
618 void *buf, int count1)
620 uint8_t tmp_buf[SECTOR_SIZE];
621 int len, nb_sectors, count;
625 /* first read to align to sector start */
626 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
629 sector_num = offset >> SECTOR_BITS;
631 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
633 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
641 /* read the sectors "in place" */
642 nb_sectors = count >> SECTOR_BITS;
643 if (nb_sectors > 0) {
644 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
646 sector_num += nb_sectors;
647 len = nb_sectors << SECTOR_BITS;
652 /* add data from the last sector */
654 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
656 memcpy(buf, tmp_buf, count);
661 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
662 const void *buf, int count1)
664 uint8_t tmp_buf[SECTOR_SIZE];
665 int len, nb_sectors, count;
669 /* first write to align to sector start */
670 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
673 sector_num = offset >> SECTOR_BITS;
675 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
677 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
678 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
687 /* write the sectors "in place" */
688 nb_sectors = count >> SECTOR_BITS;
689 if (nb_sectors > 0) {
690 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
692 sector_num += nb_sectors;
693 len = nb_sectors << SECTOR_BITS;
698 /* add data from the last sector */
700 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
702 memcpy(tmp_buf, buf, count);
703 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
710 * Truncate file to 'offset' bytes (needed only for file protocols)
712 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
714 BlockDriver *drv = bs->drv;
717 if (!drv->bdrv_truncate)
719 return drv->bdrv_truncate(bs, offset);
723 * Length of a file in bytes. Return < 0 if error or unknown.
725 int64_t bdrv_getlength(BlockDriverState *bs)
727 BlockDriver *drv = bs->drv;
730 if (!drv->bdrv_getlength) {
732 return bs->total_sectors * SECTOR_SIZE;
734 return drv->bdrv_getlength(bs);
737 /* return 0 as number of sectors if no device present or error */
738 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
741 length = bdrv_getlength(bs);
745 length = length >> SECTOR_BITS;
746 *nb_sectors_ptr = length;
750 uint8_t boot_ind; /* 0x80 - active */
751 uint8_t head; /* starting head */
752 uint8_t sector; /* starting sector */
753 uint8_t cyl; /* starting cylinder */
754 uint8_t sys_ind; /* What partition type */
755 uint8_t end_head; /* end head */
756 uint8_t end_sector; /* end sector */
757 uint8_t end_cyl; /* end cylinder */
758 uint32_t start_sect; /* starting sector counting from 0 */
759 uint32_t nr_sects; /* nr of sectors in partition */
760 } __attribute__((packed));
762 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
763 static int guess_disk_lchs(BlockDriverState *bs,
764 int *pcylinders, int *pheads, int *psectors)
767 int ret, i, heads, sectors, cylinders;
772 bdrv_get_geometry(bs, &nb_sectors);
774 ret = bdrv_read(bs, 0, buf, 1);
777 /* test msdos magic */
778 if (buf[510] != 0x55 || buf[511] != 0xaa)
780 for(i = 0; i < 4; i++) {
781 p = ((struct partition *)(buf + 0x1be)) + i;
782 nr_sects = le32_to_cpu(p->nr_sects);
783 if (nr_sects && p->end_head) {
784 /* We make the assumption that the partition terminates on
785 a cylinder boundary */
786 heads = p->end_head + 1;
787 sectors = p->end_sector & 63;
790 cylinders = nb_sectors / (heads * sectors);
791 if (cylinders < 1 || cylinders > 16383)
795 *pcylinders = cylinders;
797 printf("guessed geometry: LCHS=%d %d %d\n",
798 cylinders, heads, sectors);
806 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
808 int translation, lba_detected = 0;
809 int cylinders, heads, secs;
812 /* if a geometry hint is available, use it */
813 bdrv_get_geometry(bs, &nb_sectors);
814 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
815 translation = bdrv_get_translation_hint(bs);
816 if (cylinders != 0) {
821 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
823 /* if heads > 16, it means that a BIOS LBA
824 translation was active, so the default
825 hardware geometry is OK */
827 goto default_geometry;
832 /* disable any translation to be in sync with
833 the logical geometry */
834 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
835 bdrv_set_translation_hint(bs,
836 BIOS_ATA_TRANSLATION_NONE);
841 /* if no geometry, use a standard physical disk geometry */
842 cylinders = nb_sectors / (16 * 63);
844 if (cylinders > 16383)
846 else if (cylinders < 2)
851 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
852 if ((*pcyls * *pheads) <= 131072) {
853 bdrv_set_translation_hint(bs,
854 BIOS_ATA_TRANSLATION_LARGE);
856 bdrv_set_translation_hint(bs,
857 BIOS_ATA_TRANSLATION_LBA);
861 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
865 void bdrv_set_geometry_hint(BlockDriverState *bs,
866 int cyls, int heads, int secs)
873 void bdrv_set_type_hint(BlockDriverState *bs, int type)
876 bs->removable = ((type == BDRV_TYPE_CDROM ||
877 type == BDRV_TYPE_FLOPPY));
880 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
882 bs->translation = translation;
885 void bdrv_get_geometry_hint(BlockDriverState *bs,
886 int *pcyls, int *pheads, int *psecs)
893 int bdrv_get_type_hint(BlockDriverState *bs)
898 int bdrv_get_translation_hint(BlockDriverState *bs)
900 return bs->translation;
903 int bdrv_is_removable(BlockDriverState *bs)
905 return bs->removable;
908 int bdrv_is_read_only(BlockDriverState *bs)
910 return bs->read_only;
913 int bdrv_is_sg(BlockDriverState *bs)
918 /* XXX: no longer used */
919 void bdrv_set_change_cb(BlockDriverState *bs,
920 void (*change_cb)(void *opaque), void *opaque)
922 bs->change_cb = change_cb;
923 bs->change_opaque = opaque;
926 int bdrv_is_encrypted(BlockDriverState *bs)
928 if (bs->backing_hd && bs->backing_hd->encrypted)
930 return bs->encrypted;
933 int bdrv_key_required(BlockDriverState *bs)
935 BlockDriverState *backing_hd = bs->backing_hd;
937 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
939 return (bs->encrypted && !bs->valid_key);
942 int bdrv_set_key(BlockDriverState *bs, const char *key)
945 if (bs->backing_hd && bs->backing_hd->encrypted) {
946 ret = bdrv_set_key(bs->backing_hd, key);
952 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
954 ret = bs->drv->bdrv_set_key(bs, key);
957 } else if (!bs->valid_key) {
959 /* call the change callback now, we skipped it on open */
960 bs->media_changed = 1;
962 bs->change_cb(bs->change_opaque);
967 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
972 pstrcpy(buf, buf_size, bs->drv->format_name);
976 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
981 for (drv = first_drv; drv != NULL; drv = drv->next) {
982 it(opaque, drv->format_name);
986 BlockDriverState *bdrv_find(const char *name)
988 BlockDriverState *bs;
990 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
991 if (!strcmp(name, bs->device_name))
997 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
999 BlockDriverState *bs;
1001 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1006 const char *bdrv_get_device_name(BlockDriverState *bs)
1008 return bs->device_name;
1011 void bdrv_flush(BlockDriverState *bs)
1013 if (bs->drv->bdrv_flush)
1014 bs->drv->bdrv_flush(bs);
1016 bdrv_flush(bs->backing_hd);
1019 void bdrv_flush_all(void)
1021 BlockDriverState *bs;
1023 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1024 if (bs->drv && !bdrv_is_read_only(bs) &&
1025 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1030 * Returns true iff the specified sector is present in the disk image. Drivers
1031 * not implementing the functionality are assumed to not support backing files,
1032 * hence all their sectors are reported as allocated.
1034 * 'pnum' is set to the number of sectors (including and immediately following
1035 * the specified sector) that are known to be in the same
1036 * allocated/unallocated state.
1038 * 'nb_sectors' is the max value 'pnum' should be set to.
1040 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1044 if (!bs->drv->bdrv_is_allocated) {
1045 if (sector_num >= bs->total_sectors) {
1049 n = bs->total_sectors - sector_num;
1050 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1053 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1056 void bdrv_info(Monitor *mon)
1058 BlockDriverState *bs;
1060 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1061 monitor_printf(mon, "%s:", bs->device_name);
1062 monitor_printf(mon, " type=");
1065 monitor_printf(mon, "hd");
1067 case BDRV_TYPE_CDROM:
1068 monitor_printf(mon, "cdrom");
1070 case BDRV_TYPE_FLOPPY:
1071 monitor_printf(mon, "floppy");
1074 monitor_printf(mon, " removable=%d", bs->removable);
1075 if (bs->removable) {
1076 monitor_printf(mon, " locked=%d", bs->locked);
1079 monitor_printf(mon, " file=");
1080 monitor_print_filename(mon, bs->filename);
1081 if (bs->backing_file[0] != '\0') {
1082 monitor_printf(mon, " backing_file=");
1083 monitor_print_filename(mon, bs->backing_file);
1085 monitor_printf(mon, " ro=%d", bs->read_only);
1086 monitor_printf(mon, " drv=%s", bs->drv->format_name);
1087 monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
1089 monitor_printf(mon, " [not inserted]");
1091 monitor_printf(mon, "\n");
1095 /* The "info blockstats" command. */
1096 void bdrv_info_stats(Monitor *mon)
1098 BlockDriverState *bs;
1100 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1101 monitor_printf(mon, "%s:"
1102 " rd_bytes=%" PRIu64
1103 " wr_bytes=%" PRIu64
1104 " rd_operations=%" PRIu64
1105 " wr_operations=%" PRIu64
1108 bs->rd_bytes, bs->wr_bytes,
1109 bs->rd_ops, bs->wr_ops);
1113 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1115 if (bs->backing_hd && bs->backing_hd->encrypted)
1116 return bs->backing_file;
1117 else if (bs->encrypted)
1118 return bs->filename;
1123 void bdrv_get_backing_filename(BlockDriverState *bs,
1124 char *filename, int filename_size)
1126 if (!bs->backing_hd) {
1127 pstrcpy(filename, filename_size, "");
1129 pstrcpy(filename, filename_size, bs->backing_file);
1133 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1134 const uint8_t *buf, int nb_sectors)
1136 BlockDriver *drv = bs->drv;
1139 if (!drv->bdrv_write_compressed)
1141 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1144 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1146 BlockDriver *drv = bs->drv;
1149 if (!drv->bdrv_get_info)
1151 memset(bdi, 0, sizeof(*bdi));
1152 return drv->bdrv_get_info(bs, bdi);
1155 /**************************************************************/
1156 /* handling of snapshots */
1158 int bdrv_snapshot_create(BlockDriverState *bs,
1159 QEMUSnapshotInfo *sn_info)
1161 BlockDriver *drv = bs->drv;
1164 if (!drv->bdrv_snapshot_create)
1166 return drv->bdrv_snapshot_create(bs, sn_info);
1169 int bdrv_snapshot_goto(BlockDriverState *bs,
1170 const char *snapshot_id)
1172 BlockDriver *drv = bs->drv;
1175 if (!drv->bdrv_snapshot_goto)
1177 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1180 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1182 BlockDriver *drv = bs->drv;
1185 if (!drv->bdrv_snapshot_delete)
1187 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1190 int bdrv_snapshot_list(BlockDriverState *bs,
1191 QEMUSnapshotInfo **psn_info)
1193 BlockDriver *drv = bs->drv;
1196 if (!drv->bdrv_snapshot_list)
1198 return drv->bdrv_snapshot_list(bs, psn_info);
1201 #define NB_SUFFIXES 4
1203 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1205 static const char suffixes[NB_SUFFIXES] = "KMGT";
1210 snprintf(buf, buf_size, "%" PRId64, size);
1213 for(i = 0; i < NB_SUFFIXES; i++) {
1214 if (size < (10 * base)) {
1215 snprintf(buf, buf_size, "%0.1f%c",
1216 (double)size / base,
1219 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1220 snprintf(buf, buf_size, "%" PRId64 "%c",
1221 ((size + (base >> 1)) / base),
1231 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1233 char buf1[128], date_buf[128], clock_buf[128];
1243 snprintf(buf, buf_size,
1244 "%-10s%-20s%7s%20s%15s",
1245 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1249 ptm = localtime(&ti);
1250 strftime(date_buf, sizeof(date_buf),
1251 "%Y-%m-%d %H:%M:%S", ptm);
1253 localtime_r(&ti, &tm);
1254 strftime(date_buf, sizeof(date_buf),
1255 "%Y-%m-%d %H:%M:%S", &tm);
1257 secs = sn->vm_clock_nsec / 1000000000;
1258 snprintf(clock_buf, sizeof(clock_buf),
1259 "%02d:%02d:%02d.%03d",
1261 (int)((secs / 60) % 60),
1263 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1264 snprintf(buf, buf_size,
1265 "%-10s%-20s%7s%20s%15s",
1266 sn->id_str, sn->name,
1267 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1275 /**************************************************************/
1278 typedef struct VectorTranslationAIOCB {
1279 BlockDriverAIOCB common;
1283 BlockDriverAIOCB *aiocb;
1284 } VectorTranslationAIOCB;
1286 static void bdrv_aio_cancel_vector(BlockDriverAIOCB *_acb)
1288 VectorTranslationAIOCB *acb
1289 = container_of(_acb, VectorTranslationAIOCB, common);
1291 bdrv_aio_cancel(acb->aiocb);
1294 static void bdrv_aio_rw_vector_cb(void *opaque, int ret)
1296 VectorTranslationAIOCB *s = (VectorTranslationAIOCB *)opaque;
1299 qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size);
1301 qemu_vfree(s->bounce);
1302 s->common.cb(s->common.opaque, ret);
1303 qemu_aio_release(s);
1306 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1310 BlockDriverCompletionFunc *cb,
1315 VectorTranslationAIOCB *s = qemu_aio_get_pool(&vectored_aio_pool, bs,
1319 s->bounce = qemu_memalign(512, nb_sectors * 512);
1320 s->is_write = is_write;
1322 qemu_iovec_to_buffer(s->iov, s->bounce);
1323 s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors,
1324 bdrv_aio_rw_vector_cb, s);
1326 s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors,
1327 bdrv_aio_rw_vector_cb, s);
1330 qemu_vfree(s->bounce);
1331 qemu_aio_release(s);
1337 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1338 QEMUIOVector *iov, int nb_sectors,
1339 BlockDriverCompletionFunc *cb, void *opaque)
1341 if (bdrv_check_request(bs, sector_num, nb_sectors))
1344 return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
1348 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1349 QEMUIOVector *iov, int nb_sectors,
1350 BlockDriverCompletionFunc *cb, void *opaque)
1352 if (bdrv_check_request(bs, sector_num, nb_sectors))
1355 return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
1359 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1360 uint8_t *buf, int nb_sectors,
1361 BlockDriverCompletionFunc *cb, void *opaque)
1363 BlockDriver *drv = bs->drv;
1364 BlockDriverAIOCB *ret;
1368 if (bdrv_check_request(bs, sector_num, nb_sectors))
1371 ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1374 /* Update stats even though technically transfer has not happened. */
1375 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1382 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1383 const uint8_t *buf, int nb_sectors,
1384 BlockDriverCompletionFunc *cb, void *opaque)
1386 BlockDriver *drv = bs->drv;
1387 BlockDriverAIOCB *ret;
1393 if (bdrv_check_request(bs, sector_num, nb_sectors))
1396 ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1399 /* Update stats even though technically transfer has not happened. */
1400 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1407 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1409 acb->pool->cancel(acb);
1413 /**************************************************************/
1414 /* async block device emulation */
1416 static void bdrv_aio_bh_cb(void *opaque)
1418 BlockDriverAIOCBSync *acb = opaque;
1419 acb->common.cb(acb->common.opaque, acb->ret);
1420 qemu_aio_release(acb);
1423 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1424 int64_t sector_num, uint8_t *buf, int nb_sectors,
1425 BlockDriverCompletionFunc *cb, void *opaque)
1427 BlockDriverAIOCBSync *acb;
1430 acb = qemu_aio_get(bs, cb, opaque);
1432 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1433 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1435 qemu_bh_schedule(acb->bh);
1436 return &acb->common;
1439 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1440 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1441 BlockDriverCompletionFunc *cb, void *opaque)
1443 BlockDriverAIOCBSync *acb;
1446 acb = qemu_aio_get(bs, cb, opaque);
1448 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1449 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1451 qemu_bh_schedule(acb->bh);
1452 return &acb->common;
1455 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1457 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1458 qemu_bh_cancel(acb->bh);
1459 qemu_aio_release(acb);
1462 /**************************************************************/
1463 /* sync block device emulation */
1465 static void bdrv_rw_em_cb(void *opaque, int ret)
1467 *(int *)opaque = ret;
1470 #define NOT_DONE 0x7fffffff
1472 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1473 uint8_t *buf, int nb_sectors)
1476 BlockDriverAIOCB *acb;
1478 async_ret = NOT_DONE;
1479 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1480 bdrv_rw_em_cb, &async_ret);
1484 while (async_ret == NOT_DONE) {
1491 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1492 const uint8_t *buf, int nb_sectors)
1495 BlockDriverAIOCB *acb;
1497 async_ret = NOT_DONE;
1498 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1499 bdrv_rw_em_cb, &async_ret);
1502 while (async_ret == NOT_DONE) {
1508 void bdrv_init(void)
1510 aio_pool_init(&vectored_aio_pool, sizeof(VectorTranslationAIOCB),
1511 bdrv_aio_cancel_vector);
1513 bdrv_register(&bdrv_raw);
1514 bdrv_register(&bdrv_host_device);
1516 bdrv_register(&bdrv_cow);
1518 bdrv_register(&bdrv_qcow);
1519 bdrv_register(&bdrv_vmdk);
1520 bdrv_register(&bdrv_cloop);
1521 bdrv_register(&bdrv_dmg);
1522 bdrv_register(&bdrv_bochs);
1523 bdrv_register(&bdrv_vpc);
1524 bdrv_register(&bdrv_vvfat);
1525 bdrv_register(&bdrv_qcow2);
1526 bdrv_register(&bdrv_parallels);
1527 bdrv_register(&bdrv_nbd);
1530 void aio_pool_init(AIOPool *pool, int aiocb_size,
1531 void (*cancel)(BlockDriverAIOCB *acb))
1533 pool->aiocb_size = aiocb_size;
1534 pool->cancel = cancel;
1535 pool->free_aiocb = NULL;
1538 void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
1539 BlockDriverCompletionFunc *cb, void *opaque)
1541 BlockDriverAIOCB *acb;
1543 if (pool->free_aiocb) {
1544 acb = pool->free_aiocb;
1545 pool->free_aiocb = acb->next;
1547 acb = qemu_mallocz(pool->aiocb_size);
1552 acb->opaque = opaque;
1556 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1559 return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
1562 void qemu_aio_release(void *p)
1564 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
1565 AIOPool *pool = acb->pool;
1566 acb->next = pool->free_aiocb;
1567 pool->free_aiocb = acb;
1570 /**************************************************************/
1571 /* removable device support */
1574 * Return TRUE if the media is present
1576 int bdrv_is_inserted(BlockDriverState *bs)
1578 BlockDriver *drv = bs->drv;
1582 if (!drv->bdrv_is_inserted)
1584 ret = drv->bdrv_is_inserted(bs);
1589 * Return TRUE if the media changed since the last call to this
1590 * function. It is currently only used for floppy disks
1592 int bdrv_media_changed(BlockDriverState *bs)
1594 BlockDriver *drv = bs->drv;
1597 if (!drv || !drv->bdrv_media_changed)
1600 ret = drv->bdrv_media_changed(bs);
1601 if (ret == -ENOTSUP)
1602 ret = bs->media_changed;
1603 bs->media_changed = 0;
1608 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1610 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1612 BlockDriver *drv = bs->drv;
1615 if (!drv || !drv->bdrv_eject) {
1618 ret = drv->bdrv_eject(bs, eject_flag);
1620 if (ret == -ENOTSUP) {
1626 int bdrv_is_locked(BlockDriverState *bs)
1632 * Lock or unlock the media (if it is locked, the user won't be able
1633 * to eject it manually).
1635 void bdrv_set_locked(BlockDriverState *bs, int locked)
1637 BlockDriver *drv = bs->drv;
1639 bs->locked = locked;
1640 if (drv && drv->bdrv_set_locked) {
1641 drv->bdrv_set_locked(bs, locked);
1645 /* needed for generic scsi interface */
1647 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1649 BlockDriver *drv = bs->drv;
1651 if (drv && drv->bdrv_ioctl)
1652 return drv->bdrv_ioctl(bs, req, buf);
1656 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
1657 unsigned long int req, void *buf,
1658 BlockDriverCompletionFunc *cb, void *opaque)
1660 BlockDriver *drv = bs->drv;
1662 if (drv && drv->bdrv_aio_ioctl)
1663 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);