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 typedef struct BlockDriverAIOCBSync {
51 BlockDriverAIOCB common;
54 /* vector translation state */
58 } BlockDriverAIOCBSync;
60 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
61 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
62 BlockDriverCompletionFunc *cb, void *opaque);
63 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
64 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
65 BlockDriverCompletionFunc *cb, void *opaque);
66 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
67 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
68 uint8_t *buf, int nb_sectors);
69 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
70 const uint8_t *buf, int nb_sectors);
72 BlockDriverState *bdrv_first;
74 static BlockDriver *first_drv;
76 int path_is_absolute(const char *path)
80 /* specific case for names like: "\\.\d:" */
81 if (*path == '/' || *path == '\\')
84 p = strchr(path, ':');
90 return (*p == '/' || *p == '\\');
96 /* if filename is absolute, just copy it to dest. Otherwise, build a
97 path to it by considering it is relative to base_path. URL are
99 void path_combine(char *dest, int dest_size,
100 const char *base_path,
101 const char *filename)
108 if (path_is_absolute(filename)) {
109 pstrcpy(dest, dest_size, filename);
111 p = strchr(base_path, ':');
116 p1 = strrchr(base_path, '/');
120 p2 = strrchr(base_path, '\\');
132 if (len > dest_size - 1)
134 memcpy(dest, base_path, len);
136 pstrcat(dest, dest_size, filename);
141 static void bdrv_register(BlockDriver *bdrv)
143 if (!bdrv->bdrv_aio_readv) {
144 /* add AIO emulation layer */
145 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
146 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
147 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
148 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
149 } else if (!bdrv->bdrv_read) {
150 /* add synchronous IO emulation layer */
151 bdrv->bdrv_read = bdrv_read_em;
152 bdrv->bdrv_write = bdrv_write_em;
154 aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel);
155 bdrv->next = first_drv;
159 /* create a new block device (by default it is empty) */
160 BlockDriverState *bdrv_new(const char *device_name)
162 BlockDriverState **pbs, *bs;
164 bs = qemu_mallocz(sizeof(BlockDriverState));
165 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
166 if (device_name[0] != '\0') {
167 /* insert at the end */
176 BlockDriver *bdrv_find_format(const char *format_name)
179 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
180 if (!strcmp(drv1->format_name, format_name))
186 int bdrv_create2(BlockDriver *drv,
187 const char *filename, int64_t size_in_sectors,
188 const char *backing_file, const char *backing_format,
191 if (drv->bdrv_create2)
192 return drv->bdrv_create2(filename, size_in_sectors, backing_file,
193 backing_format, flags);
194 if (drv->bdrv_create)
195 return drv->bdrv_create(filename, size_in_sectors, backing_file,
200 int bdrv_create(BlockDriver *drv,
201 const char *filename, int64_t size_in_sectors,
202 const char *backing_file, int flags)
204 if (!drv->bdrv_create)
206 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
210 void get_tmp_filename(char *filename, int size)
212 char temp_dir[MAX_PATH];
214 GetTempPath(MAX_PATH, temp_dir);
215 GetTempFileName(temp_dir, "qem", 0, filename);
218 void get_tmp_filename(char *filename, int size)
222 /* XXX: race condition possible */
223 tmpdir = getenv("TMPDIR");
226 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
227 fd = mkstemp(filename);
233 static int is_windows_drive_prefix(const char *filename)
235 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
236 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
240 static int is_windows_drive(const char *filename)
242 if (is_windows_drive_prefix(filename) &&
245 if (strstart(filename, "\\\\.\\", NULL) ||
246 strstart(filename, "//./", NULL))
252 static BlockDriver *find_protocol(const char *filename)
260 if (is_windows_drive(filename) ||
261 is_windows_drive_prefix(filename))
264 p = strchr(filename, ':');
268 if (len > sizeof(protocol) - 1)
269 len = sizeof(protocol) - 1;
270 memcpy(protocol, filename, len);
271 protocol[len] = '\0';
272 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
273 if (drv1->protocol_name &&
274 !strcmp(drv1->protocol_name, protocol))
280 /* XXX: force raw format if block or character device ? It would
281 simplify the BSD case */
282 static BlockDriver *find_image_format(const char *filename)
284 int ret, score, score_max;
285 BlockDriver *drv1, *drv;
287 BlockDriverState *bs;
289 /* detect host devices. By convention, /dev/cdrom[N] is always
290 recognized as a host CDROM */
291 if (strstart(filename, "/dev/cdrom", NULL))
292 return &bdrv_host_device;
294 if (is_windows_drive(filename))
295 return &bdrv_host_device;
299 if (stat(filename, &st) >= 0 &&
300 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
301 return &bdrv_host_device;
306 drv = find_protocol(filename);
307 /* no need to test disk image formats for vvfat */
308 if (drv == &bdrv_vvfat)
311 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
314 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
321 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
322 if (drv1->bdrv_probe) {
323 score = drv1->bdrv_probe(buf, ret, filename);
324 if (score > score_max) {
333 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
335 BlockDriverState *bs;
339 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
349 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
351 return bdrv_open2(bs, filename, flags, NULL);
354 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
358 char tmp_filename[PATH_MAX];
359 char backing_filename[PATH_MAX];
362 bs->is_temporary = 0;
365 /* buffer_alignment defaulted to 512, drivers can change this value */
366 bs->buffer_alignment = 512;
368 if (flags & BDRV_O_SNAPSHOT) {
369 BlockDriverState *bs1;
373 /* if snapshot, we create a temporary backing file and open it
374 instead of opening 'filename' directly */
376 /* if there is a backing file, use it */
378 ret = bdrv_open2(bs1, filename, 0, drv);
383 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
385 if (bs1->drv && bs1->drv->protocol_name)
390 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
392 /* Real path is meaningless for protocols */
394 snprintf(backing_filename, sizeof(backing_filename),
397 realpath(filename, backing_filename);
399 ret = bdrv_create2(&bdrv_qcow2, tmp_filename,
400 total_size, backing_filename,
401 (drv ? drv->format_name : NULL), 0);
405 filename = tmp_filename;
407 bs->is_temporary = 1;
410 pstrcpy(bs->filename, sizeof(bs->filename), filename);
411 if (flags & BDRV_O_FILE) {
412 drv = find_protocol(filename);
414 drv = find_image_format(filename);
418 goto unlink_and_fail;
421 bs->opaque = qemu_mallocz(drv->instance_size);
422 /* Note: for compatibility, we open disk image files as RDWR, and
423 RDONLY as fallback */
424 if (!(flags & BDRV_O_FILE))
425 open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
427 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
428 ret = drv->bdrv_open(bs, filename, open_flags);
429 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
430 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
434 qemu_free(bs->opaque);
438 if (bs->is_temporary)
442 if (drv->bdrv_getlength) {
443 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
446 if (bs->is_temporary) {
450 if (bs->backing_file[0] != '\0') {
451 /* if there is a backing file, use it */
452 BlockDriver *back_drv = NULL;
453 bs->backing_hd = bdrv_new("");
454 path_combine(backing_filename, sizeof(backing_filename),
455 filename, bs->backing_file);
456 if (bs->backing_format[0] != '\0')
457 back_drv = bdrv_find_format(bs->backing_format);
458 ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
466 if (!bdrv_key_required(bs)) {
467 /* call the change callback */
468 bs->media_changed = 1;
470 bs->change_cb(bs->change_opaque);
475 void bdrv_close(BlockDriverState *bs)
479 bdrv_delete(bs->backing_hd);
480 bs->drv->bdrv_close(bs);
481 qemu_free(bs->opaque);
483 if (bs->is_temporary) {
484 unlink(bs->filename);
490 /* call the change callback */
491 bs->media_changed = 1;
493 bs->change_cb(bs->change_opaque);
497 void bdrv_delete(BlockDriverState *bs)
499 BlockDriverState **pbs;
502 while (*pbs != bs && *pbs != NULL)
512 * Run consistency checks on an image
514 * Returns the number of errors or -errno when an internal error occurs
516 int bdrv_check(BlockDriverState *bs)
518 if (bs->drv->bdrv_check == NULL) {
522 return bs->drv->bdrv_check(bs);
525 /* commit COW file into the raw image */
526 int bdrv_commit(BlockDriverState *bs)
528 BlockDriver *drv = bs->drv;
529 int64_t i, total_sectors;
531 unsigned char sector[512];
540 if (!bs->backing_hd) {
544 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
545 for (i = 0; i < total_sectors;) {
546 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
547 for(j = 0; j < n; j++) {
548 if (bdrv_read(bs, i, sector, 1) != 0) {
552 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
562 if (drv->bdrv_make_empty)
563 return drv->bdrv_make_empty(bs);
568 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
573 if (!bdrv_is_inserted(bs))
579 len = bdrv_getlength(bs);
581 if ((offset + size) > len)
587 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
590 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
593 /* return < 0 if error. See bdrv_write() for the return codes */
594 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
595 uint8_t *buf, int nb_sectors)
597 BlockDriver *drv = bs->drv;
601 if (bdrv_check_request(bs, sector_num, nb_sectors))
604 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
607 /* Return < 0 if error. Important errors are:
608 -EIO generic I/O error (may happen for all errors)
609 -ENOMEDIUM No media inserted.
610 -EINVAL Invalid sector number or nb_sectors
611 -EACCES Trying to write a read-only device
613 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
614 const uint8_t *buf, int nb_sectors)
616 BlockDriver *drv = bs->drv;
621 if (bdrv_check_request(bs, sector_num, nb_sectors))
624 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
627 int bdrv_pread(BlockDriverState *bs, int64_t offset,
628 void *buf, int count1)
630 uint8_t tmp_buf[SECTOR_SIZE];
631 int len, nb_sectors, count;
635 /* first read to align to sector start */
636 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
639 sector_num = offset >> SECTOR_BITS;
641 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
643 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
651 /* read the sectors "in place" */
652 nb_sectors = count >> SECTOR_BITS;
653 if (nb_sectors > 0) {
654 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
656 sector_num += nb_sectors;
657 len = nb_sectors << SECTOR_BITS;
662 /* add data from the last sector */
664 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
666 memcpy(buf, tmp_buf, count);
671 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
672 const void *buf, int count1)
674 uint8_t tmp_buf[SECTOR_SIZE];
675 int len, nb_sectors, count;
679 /* first write to align to sector start */
680 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
683 sector_num = offset >> SECTOR_BITS;
685 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
687 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
688 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
697 /* write the sectors "in place" */
698 nb_sectors = count >> SECTOR_BITS;
699 if (nb_sectors > 0) {
700 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
702 sector_num += nb_sectors;
703 len = nb_sectors << SECTOR_BITS;
708 /* add data from the last sector */
710 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
712 memcpy(tmp_buf, buf, count);
713 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
720 * Truncate file to 'offset' bytes (needed only for file protocols)
722 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
724 BlockDriver *drv = bs->drv;
727 if (!drv->bdrv_truncate)
729 return drv->bdrv_truncate(bs, offset);
733 * Length of a file in bytes. Return < 0 if error or unknown.
735 int64_t bdrv_getlength(BlockDriverState *bs)
737 BlockDriver *drv = bs->drv;
740 if (!drv->bdrv_getlength) {
742 return bs->total_sectors * SECTOR_SIZE;
744 return drv->bdrv_getlength(bs);
747 /* return 0 as number of sectors if no device present or error */
748 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
751 length = bdrv_getlength(bs);
755 length = length >> SECTOR_BITS;
756 *nb_sectors_ptr = length;
760 uint8_t boot_ind; /* 0x80 - active */
761 uint8_t head; /* starting head */
762 uint8_t sector; /* starting sector */
763 uint8_t cyl; /* starting cylinder */
764 uint8_t sys_ind; /* What partition type */
765 uint8_t end_head; /* end head */
766 uint8_t end_sector; /* end sector */
767 uint8_t end_cyl; /* end cylinder */
768 uint32_t start_sect; /* starting sector counting from 0 */
769 uint32_t nr_sects; /* nr of sectors in partition */
770 } __attribute__((packed));
772 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
773 static int guess_disk_lchs(BlockDriverState *bs,
774 int *pcylinders, int *pheads, int *psectors)
777 int ret, i, heads, sectors, cylinders;
782 bdrv_get_geometry(bs, &nb_sectors);
784 ret = bdrv_read(bs, 0, buf, 1);
787 /* test msdos magic */
788 if (buf[510] != 0x55 || buf[511] != 0xaa)
790 for(i = 0; i < 4; i++) {
791 p = ((struct partition *)(buf + 0x1be)) + i;
792 nr_sects = le32_to_cpu(p->nr_sects);
793 if (nr_sects && p->end_head) {
794 /* We make the assumption that the partition terminates on
795 a cylinder boundary */
796 heads = p->end_head + 1;
797 sectors = p->end_sector & 63;
800 cylinders = nb_sectors / (heads * sectors);
801 if (cylinders < 1 || cylinders > 16383)
805 *pcylinders = cylinders;
807 printf("guessed geometry: LCHS=%d %d %d\n",
808 cylinders, heads, sectors);
816 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
818 int translation, lba_detected = 0;
819 int cylinders, heads, secs;
822 /* if a geometry hint is available, use it */
823 bdrv_get_geometry(bs, &nb_sectors);
824 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
825 translation = bdrv_get_translation_hint(bs);
826 if (cylinders != 0) {
831 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
833 /* if heads > 16, it means that a BIOS LBA
834 translation was active, so the default
835 hardware geometry is OK */
837 goto default_geometry;
842 /* disable any translation to be in sync with
843 the logical geometry */
844 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
845 bdrv_set_translation_hint(bs,
846 BIOS_ATA_TRANSLATION_NONE);
851 /* if no geometry, use a standard physical disk geometry */
852 cylinders = nb_sectors / (16 * 63);
854 if (cylinders > 16383)
856 else if (cylinders < 2)
861 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
862 if ((*pcyls * *pheads) <= 131072) {
863 bdrv_set_translation_hint(bs,
864 BIOS_ATA_TRANSLATION_LARGE);
866 bdrv_set_translation_hint(bs,
867 BIOS_ATA_TRANSLATION_LBA);
871 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
875 void bdrv_set_geometry_hint(BlockDriverState *bs,
876 int cyls, int heads, int secs)
883 void bdrv_set_type_hint(BlockDriverState *bs, int type)
886 bs->removable = ((type == BDRV_TYPE_CDROM ||
887 type == BDRV_TYPE_FLOPPY));
890 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
892 bs->translation = translation;
895 void bdrv_get_geometry_hint(BlockDriverState *bs,
896 int *pcyls, int *pheads, int *psecs)
903 int bdrv_get_type_hint(BlockDriverState *bs)
908 int bdrv_get_translation_hint(BlockDriverState *bs)
910 return bs->translation;
913 int bdrv_is_removable(BlockDriverState *bs)
915 return bs->removable;
918 int bdrv_is_read_only(BlockDriverState *bs)
920 return bs->read_only;
923 int bdrv_is_sg(BlockDriverState *bs)
928 /* XXX: no longer used */
929 void bdrv_set_change_cb(BlockDriverState *bs,
930 void (*change_cb)(void *opaque), void *opaque)
932 bs->change_cb = change_cb;
933 bs->change_opaque = opaque;
936 int bdrv_is_encrypted(BlockDriverState *bs)
938 if (bs->backing_hd && bs->backing_hd->encrypted)
940 return bs->encrypted;
943 int bdrv_key_required(BlockDriverState *bs)
945 BlockDriverState *backing_hd = bs->backing_hd;
947 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
949 return (bs->encrypted && !bs->valid_key);
952 int bdrv_set_key(BlockDriverState *bs, const char *key)
955 if (bs->backing_hd && bs->backing_hd->encrypted) {
956 ret = bdrv_set_key(bs->backing_hd, key);
962 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
964 ret = bs->drv->bdrv_set_key(bs, key);
967 } else if (!bs->valid_key) {
969 /* call the change callback now, we skipped it on open */
970 bs->media_changed = 1;
972 bs->change_cb(bs->change_opaque);
977 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
982 pstrcpy(buf, buf_size, bs->drv->format_name);
986 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
991 for (drv = first_drv; drv != NULL; drv = drv->next) {
992 it(opaque, drv->format_name);
996 BlockDriverState *bdrv_find(const char *name)
998 BlockDriverState *bs;
1000 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1001 if (!strcmp(name, bs->device_name))
1007 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1009 BlockDriverState *bs;
1011 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1016 const char *bdrv_get_device_name(BlockDriverState *bs)
1018 return bs->device_name;
1021 void bdrv_flush(BlockDriverState *bs)
1025 if (bs->drv->bdrv_flush)
1026 bs->drv->bdrv_flush(bs);
1028 bdrv_flush(bs->backing_hd);
1031 void bdrv_flush_all(void)
1033 BlockDriverState *bs;
1035 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1036 if (bs->drv && !bdrv_is_read_only(bs) &&
1037 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1042 * Returns true iff the specified sector is present in the disk image. Drivers
1043 * not implementing the functionality are assumed to not support backing files,
1044 * hence all their sectors are reported as allocated.
1046 * 'pnum' is set to the number of sectors (including and immediately following
1047 * the specified sector) that are known to be in the same
1048 * allocated/unallocated state.
1050 * 'nb_sectors' is the max value 'pnum' should be set to.
1052 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1056 if (!bs->drv->bdrv_is_allocated) {
1057 if (sector_num >= bs->total_sectors) {
1061 n = bs->total_sectors - sector_num;
1062 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1065 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1068 void bdrv_info(Monitor *mon)
1070 BlockDriverState *bs;
1072 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1073 monitor_printf(mon, "%s:", bs->device_name);
1074 monitor_printf(mon, " type=");
1077 monitor_printf(mon, "hd");
1079 case BDRV_TYPE_CDROM:
1080 monitor_printf(mon, "cdrom");
1082 case BDRV_TYPE_FLOPPY:
1083 monitor_printf(mon, "floppy");
1086 monitor_printf(mon, " removable=%d", bs->removable);
1087 if (bs->removable) {
1088 monitor_printf(mon, " locked=%d", bs->locked);
1091 monitor_printf(mon, " file=");
1092 monitor_print_filename(mon, bs->filename);
1093 if (bs->backing_file[0] != '\0') {
1094 monitor_printf(mon, " backing_file=");
1095 monitor_print_filename(mon, bs->backing_file);
1097 monitor_printf(mon, " ro=%d", bs->read_only);
1098 monitor_printf(mon, " drv=%s", bs->drv->format_name);
1099 monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
1101 monitor_printf(mon, " [not inserted]");
1103 monitor_printf(mon, "\n");
1107 /* The "info blockstats" command. */
1108 void bdrv_info_stats(Monitor *mon)
1110 BlockDriverState *bs;
1112 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1113 monitor_printf(mon, "%s:"
1114 " rd_bytes=%" PRIu64
1115 " wr_bytes=%" PRIu64
1116 " rd_operations=%" PRIu64
1117 " wr_operations=%" PRIu64
1120 bs->rd_bytes, bs->wr_bytes,
1121 bs->rd_ops, bs->wr_ops);
1125 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1127 if (bs->backing_hd && bs->backing_hd->encrypted)
1128 return bs->backing_file;
1129 else if (bs->encrypted)
1130 return bs->filename;
1135 void bdrv_get_backing_filename(BlockDriverState *bs,
1136 char *filename, int filename_size)
1138 if (!bs->backing_hd) {
1139 pstrcpy(filename, filename_size, "");
1141 pstrcpy(filename, filename_size, bs->backing_file);
1145 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1146 const uint8_t *buf, int nb_sectors)
1148 BlockDriver *drv = bs->drv;
1151 if (!drv->bdrv_write_compressed)
1153 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1156 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1158 BlockDriver *drv = bs->drv;
1161 if (!drv->bdrv_get_info)
1163 memset(bdi, 0, sizeof(*bdi));
1164 return drv->bdrv_get_info(bs, bdi);
1167 int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size)
1169 BlockDriver *drv = bs->drv;
1172 if (!drv->bdrv_put_buffer)
1174 return drv->bdrv_put_buffer(bs, buf, pos, size);
1177 int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size)
1179 BlockDriver *drv = bs->drv;
1182 if (!drv->bdrv_get_buffer)
1184 return drv->bdrv_get_buffer(bs, buf, pos, size);
1187 /**************************************************************/
1188 /* handling of snapshots */
1190 int bdrv_snapshot_create(BlockDriverState *bs,
1191 QEMUSnapshotInfo *sn_info)
1193 BlockDriver *drv = bs->drv;
1196 if (!drv->bdrv_snapshot_create)
1198 return drv->bdrv_snapshot_create(bs, sn_info);
1201 int bdrv_snapshot_goto(BlockDriverState *bs,
1202 const char *snapshot_id)
1204 BlockDriver *drv = bs->drv;
1207 if (!drv->bdrv_snapshot_goto)
1209 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1212 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1214 BlockDriver *drv = bs->drv;
1217 if (!drv->bdrv_snapshot_delete)
1219 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1222 int bdrv_snapshot_list(BlockDriverState *bs,
1223 QEMUSnapshotInfo **psn_info)
1225 BlockDriver *drv = bs->drv;
1228 if (!drv->bdrv_snapshot_list)
1230 return drv->bdrv_snapshot_list(bs, psn_info);
1233 #define NB_SUFFIXES 4
1235 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1237 static const char suffixes[NB_SUFFIXES] = "KMGT";
1242 snprintf(buf, buf_size, "%" PRId64, size);
1245 for(i = 0; i < NB_SUFFIXES; i++) {
1246 if (size < (10 * base)) {
1247 snprintf(buf, buf_size, "%0.1f%c",
1248 (double)size / base,
1251 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1252 snprintf(buf, buf_size, "%" PRId64 "%c",
1253 ((size + (base >> 1)) / base),
1263 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1265 char buf1[128], date_buf[128], clock_buf[128];
1275 snprintf(buf, buf_size,
1276 "%-10s%-20s%7s%20s%15s",
1277 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1281 ptm = localtime(&ti);
1282 strftime(date_buf, sizeof(date_buf),
1283 "%Y-%m-%d %H:%M:%S", ptm);
1285 localtime_r(&ti, &tm);
1286 strftime(date_buf, sizeof(date_buf),
1287 "%Y-%m-%d %H:%M:%S", &tm);
1289 secs = sn->vm_clock_nsec / 1000000000;
1290 snprintf(clock_buf, sizeof(clock_buf),
1291 "%02d:%02d:%02d.%03d",
1293 (int)((secs / 60) % 60),
1295 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1296 snprintf(buf, buf_size,
1297 "%-10s%-20s%7s%20s%15s",
1298 sn->id_str, sn->name,
1299 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1307 /**************************************************************/
1310 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1311 QEMUIOVector *qiov, int nb_sectors,
1312 BlockDriverCompletionFunc *cb, void *opaque)
1314 BlockDriver *drv = bs->drv;
1315 BlockDriverAIOCB *ret;
1319 if (bdrv_check_request(bs, sector_num, nb_sectors))
1322 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1326 /* Update stats even though technically transfer has not happened. */
1327 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1334 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1335 QEMUIOVector *qiov, int nb_sectors,
1336 BlockDriverCompletionFunc *cb, void *opaque)
1338 BlockDriver *drv = bs->drv;
1339 BlockDriverAIOCB *ret;
1345 if (bdrv_check_request(bs, sector_num, nb_sectors))
1348 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1352 /* Update stats even though technically transfer has not happened. */
1353 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1360 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1362 acb->pool->cancel(acb);
1366 /**************************************************************/
1367 /* async block device emulation */
1369 static void bdrv_aio_bh_cb(void *opaque)
1371 BlockDriverAIOCBSync *acb = opaque;
1374 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1375 qemu_vfree(acb->bounce);
1376 acb->common.cb(acb->common.opaque, acb->ret);
1378 qemu_aio_release(acb);
1381 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1385 BlockDriverCompletionFunc *cb,
1390 BlockDriverAIOCBSync *acb;
1392 acb = qemu_aio_get(bs, cb, opaque);
1393 acb->is_write = is_write;
1395 acb->bounce = qemu_blockalign(bs, qiov->size);
1398 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1401 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
1402 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
1404 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
1407 qemu_bh_schedule(acb->bh);
1409 return &acb->common;
1412 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
1413 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1414 BlockDriverCompletionFunc *cb, void *opaque)
1416 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1419 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
1420 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1421 BlockDriverCompletionFunc *cb, void *opaque)
1423 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1427 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1429 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1430 qemu_bh_cancel(acb->bh);
1431 qemu_aio_release(acb);
1434 /**************************************************************/
1435 /* sync block device emulation */
1437 static void bdrv_rw_em_cb(void *opaque, int ret)
1439 *(int *)opaque = ret;
1442 #define NOT_DONE 0x7fffffff
1444 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1445 uint8_t *buf, int nb_sectors)
1448 BlockDriverAIOCB *acb;
1452 async_ret = NOT_DONE;
1453 iov.iov_base = (void *)buf;
1454 iov.iov_len = nb_sectors * 512;
1455 qemu_iovec_init_external(&qiov, &iov, 1);
1456 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
1457 bdrv_rw_em_cb, &async_ret);
1461 while (async_ret == NOT_DONE) {
1468 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1469 const uint8_t *buf, int nb_sectors)
1472 BlockDriverAIOCB *acb;
1476 async_ret = NOT_DONE;
1477 iov.iov_base = (void *)buf;
1478 iov.iov_len = nb_sectors * 512;
1479 qemu_iovec_init_external(&qiov, &iov, 1);
1480 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
1481 bdrv_rw_em_cb, &async_ret);
1484 while (async_ret == NOT_DONE) {
1490 void bdrv_init(void)
1492 bdrv_register(&bdrv_raw);
1493 bdrv_register(&bdrv_host_device);
1495 bdrv_register(&bdrv_cow);
1497 bdrv_register(&bdrv_qcow);
1498 bdrv_register(&bdrv_vmdk);
1499 bdrv_register(&bdrv_cloop);
1500 bdrv_register(&bdrv_dmg);
1501 bdrv_register(&bdrv_bochs);
1502 bdrv_register(&bdrv_vpc);
1503 bdrv_register(&bdrv_vvfat);
1504 bdrv_register(&bdrv_qcow2);
1505 bdrv_register(&bdrv_parallels);
1506 bdrv_register(&bdrv_nbd);
1509 void aio_pool_init(AIOPool *pool, int aiocb_size,
1510 void (*cancel)(BlockDriverAIOCB *acb))
1512 pool->aiocb_size = aiocb_size;
1513 pool->cancel = cancel;
1514 pool->free_aiocb = NULL;
1517 void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
1518 BlockDriverCompletionFunc *cb, void *opaque)
1520 BlockDriverAIOCB *acb;
1522 if (pool->free_aiocb) {
1523 acb = pool->free_aiocb;
1524 pool->free_aiocb = acb->next;
1526 acb = qemu_mallocz(pool->aiocb_size);
1531 acb->opaque = opaque;
1535 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1538 return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
1541 void qemu_aio_release(void *p)
1543 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
1544 AIOPool *pool = acb->pool;
1545 acb->next = pool->free_aiocb;
1546 pool->free_aiocb = acb;
1549 /**************************************************************/
1550 /* removable device support */
1553 * Return TRUE if the media is present
1555 int bdrv_is_inserted(BlockDriverState *bs)
1557 BlockDriver *drv = bs->drv;
1561 if (!drv->bdrv_is_inserted)
1563 ret = drv->bdrv_is_inserted(bs);
1568 * Return TRUE if the media changed since the last call to this
1569 * function. It is currently only used for floppy disks
1571 int bdrv_media_changed(BlockDriverState *bs)
1573 BlockDriver *drv = bs->drv;
1576 if (!drv || !drv->bdrv_media_changed)
1579 ret = drv->bdrv_media_changed(bs);
1580 if (ret == -ENOTSUP)
1581 ret = bs->media_changed;
1582 bs->media_changed = 0;
1587 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1589 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1591 BlockDriver *drv = bs->drv;
1594 if (!drv || !drv->bdrv_eject) {
1597 ret = drv->bdrv_eject(bs, eject_flag);
1599 if (ret == -ENOTSUP) {
1605 int bdrv_is_locked(BlockDriverState *bs)
1611 * Lock or unlock the media (if it is locked, the user won't be able
1612 * to eject it manually).
1614 void bdrv_set_locked(BlockDriverState *bs, int locked)
1616 BlockDriver *drv = bs->drv;
1618 bs->locked = locked;
1619 if (drv && drv->bdrv_set_locked) {
1620 drv->bdrv_set_locked(bs, locked);
1624 /* needed for generic scsi interface */
1626 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1628 BlockDriver *drv = bs->drv;
1630 if (drv && drv->bdrv_ioctl)
1631 return drv->bdrv_ioctl(bs, req, buf);
1635 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
1636 unsigned long int req, void *buf,
1637 BlockDriverCompletionFunc *cb, void *opaque)
1639 BlockDriver *drv = bs->drv;
1641 if (drv && drv->bdrv_aio_ioctl)
1642 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
1646 void *qemu_blockalign(BlockDriverState *bs, size_t size)
1648 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);