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"
36 #include <sys/types.h>
38 #include <sys/ioctl.h>
49 #define SECTOR_SIZE (1 << SECTOR_BITS)
51 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
52 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
53 BlockDriverCompletionFunc *cb, void *opaque);
54 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
55 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
56 BlockDriverCompletionFunc *cb, void *opaque);
57 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
58 uint8_t *buf, int nb_sectors);
59 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
60 const uint8_t *buf, int nb_sectors);
62 BlockDriverState *bdrv_first;
64 static BlockDriver *first_drv;
66 int path_is_absolute(const char *path)
70 /* specific case for names like: "\\.\d:" */
71 if (*path == '/' || *path == '\\')
74 p = strchr(path, ':');
80 return (*p == '/' || *p == '\\');
86 /* if filename is absolute, just copy it to dest. Otherwise, build a
87 path to it by considering it is relative to base_path. URL are
89 void path_combine(char *dest, int dest_size,
90 const char *base_path,
98 if (path_is_absolute(filename)) {
99 pstrcpy(dest, dest_size, filename);
101 p = strchr(base_path, ':');
106 p1 = strrchr(base_path, '/');
110 p2 = strrchr(base_path, '\\');
122 if (len > dest_size - 1)
124 memcpy(dest, base_path, len);
126 pstrcat(dest, dest_size, filename);
130 void bdrv_register(BlockDriver *bdrv)
132 if (!bdrv->bdrv_aio_readv) {
133 /* add AIO emulation layer */
134 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
135 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
136 } else if (!bdrv->bdrv_read) {
137 /* add synchronous IO emulation layer */
138 bdrv->bdrv_read = bdrv_read_em;
139 bdrv->bdrv_write = bdrv_write_em;
141 bdrv->next = first_drv;
145 /* create a new block device (by default it is empty) */
146 BlockDriverState *bdrv_new(const char *device_name)
148 BlockDriverState **pbs, *bs;
150 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, const char* filename,
173 QEMUOptionParameter *options)
175 if (!drv->bdrv_create)
178 return drv->bdrv_create(filename, options);
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))
234 return bdrv_find_format("raw");
236 p = strchr(filename, ':');
238 return bdrv_find_format("raw");
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_find_format("host_device");
266 if (is_windows_drive(filename))
267 return bdrv_find_format("host_device");
271 if (stat(filename, &st) >= 0 &&
272 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
273 return bdrv_find_format("host_device");
278 drv = find_protocol(filename);
279 /* no need to test disk image formats for vvfat */
280 if (drv && strcmp(drv->format_name, "vvfat") == 0)
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;
311 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
321 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
323 return bdrv_open2(bs, filename, flags, NULL);
326 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
330 char tmp_filename[PATH_MAX];
331 char backing_filename[PATH_MAX];
334 bs->is_temporary = 0;
337 /* buffer_alignment defaulted to 512, drivers can change this value */
338 bs->buffer_alignment = 512;
340 if (flags & BDRV_O_SNAPSHOT) {
341 BlockDriverState *bs1;
344 BlockDriver *bdrv_qcow2;
345 QEMUOptionParameter *options;
347 /* if snapshot, we create a temporary backing file and open it
348 instead of opening 'filename' directly */
350 /* if there is a backing file, use it */
352 ret = bdrv_open2(bs1, filename, 0, drv);
357 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
359 if (bs1->drv && bs1->drv->protocol_name)
364 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
366 /* Real path is meaningless for protocols */
368 snprintf(backing_filename, sizeof(backing_filename),
371 realpath(filename, backing_filename);
373 bdrv_qcow2 = bdrv_find_format("qcow2");
374 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
376 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
377 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
379 set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
383 ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
388 filename = tmp_filename;
390 bs->is_temporary = 1;
393 pstrcpy(bs->filename, sizeof(bs->filename), filename);
394 if (flags & BDRV_O_FILE) {
395 drv = find_protocol(filename);
397 drv = find_image_format(filename);
401 goto unlink_and_fail;
404 bs->opaque = qemu_mallocz(drv->instance_size);
405 /* Note: for compatibility, we open disk image files as RDWR, and
406 RDONLY as fallback */
407 if (!(flags & BDRV_O_FILE))
408 open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
410 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
411 ret = drv->bdrv_open(bs, filename, open_flags);
412 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
413 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
417 qemu_free(bs->opaque);
421 if (bs->is_temporary)
425 if (drv->bdrv_getlength) {
426 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
429 if (bs->is_temporary) {
433 if (bs->backing_file[0] != '\0') {
434 /* if there is a backing file, use it */
435 BlockDriver *back_drv = NULL;
436 bs->backing_hd = bdrv_new("");
437 path_combine(backing_filename, sizeof(backing_filename),
438 filename, bs->backing_file);
439 if (bs->backing_format[0] != '\0')
440 back_drv = bdrv_find_format(bs->backing_format);
441 ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
449 if (!bdrv_key_required(bs)) {
450 /* call the change callback */
451 bs->media_changed = 1;
453 bs->change_cb(bs->change_opaque);
458 void bdrv_close(BlockDriverState *bs)
462 bdrv_delete(bs->backing_hd);
463 bs->drv->bdrv_close(bs);
464 qemu_free(bs->opaque);
466 if (bs->is_temporary) {
467 unlink(bs->filename);
473 /* call the change callback */
474 bs->media_changed = 1;
476 bs->change_cb(bs->change_opaque);
480 void bdrv_delete(BlockDriverState *bs)
482 BlockDriverState **pbs;
485 while (*pbs != bs && *pbs != NULL)
495 * Run consistency checks on an image
497 * Returns the number of errors or -errno when an internal error occurs
499 int bdrv_check(BlockDriverState *bs)
501 if (bs->drv->bdrv_check == NULL) {
505 return bs->drv->bdrv_check(bs);
508 /* commit COW file into the raw image */
509 int bdrv_commit(BlockDriverState *bs)
511 BlockDriver *drv = bs->drv;
512 int64_t i, total_sectors;
514 unsigned char sector[512];
523 if (!bs->backing_hd) {
527 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
528 for (i = 0; i < total_sectors;) {
529 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
530 for(j = 0; j < n; j++) {
531 if (bdrv_read(bs, i, sector, 1) != 0) {
535 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
545 if (drv->bdrv_make_empty)
546 return drv->bdrv_make_empty(bs);
551 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
556 if (!bdrv_is_inserted(bs))
562 len = bdrv_getlength(bs);
567 if ((offset > len) || (len - offset < size))
573 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
576 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
579 /* return < 0 if error. See bdrv_write() for the return codes */
580 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
581 uint8_t *buf, int nb_sectors)
583 BlockDriver *drv = bs->drv;
587 if (bdrv_check_request(bs, sector_num, nb_sectors))
590 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
593 /* Return < 0 if error. Important errors are:
594 -EIO generic I/O error (may happen for all errors)
595 -ENOMEDIUM No media inserted.
596 -EINVAL Invalid sector number or nb_sectors
597 -EACCES Trying to write a read-only device
599 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
600 const uint8_t *buf, int nb_sectors)
602 BlockDriver *drv = bs->drv;
607 if (bdrv_check_request(bs, sector_num, nb_sectors))
610 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
613 int bdrv_pread(BlockDriverState *bs, int64_t offset,
614 void *buf, int count1)
616 uint8_t tmp_buf[SECTOR_SIZE];
617 int len, nb_sectors, count;
621 /* first read to align to sector start */
622 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
625 sector_num = offset >> SECTOR_BITS;
627 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
629 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
637 /* read the sectors "in place" */
638 nb_sectors = count >> SECTOR_BITS;
639 if (nb_sectors > 0) {
640 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
642 sector_num += nb_sectors;
643 len = nb_sectors << SECTOR_BITS;
648 /* add data from the last sector */
650 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
652 memcpy(buf, tmp_buf, count);
657 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
658 const void *buf, int count1)
660 uint8_t tmp_buf[SECTOR_SIZE];
661 int len, nb_sectors, count;
665 /* first write to align to sector start */
666 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
669 sector_num = offset >> SECTOR_BITS;
671 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
673 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
674 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
683 /* write the sectors "in place" */
684 nb_sectors = count >> SECTOR_BITS;
685 if (nb_sectors > 0) {
686 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
688 sector_num += nb_sectors;
689 len = nb_sectors << SECTOR_BITS;
694 /* add data from the last sector */
696 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
698 memcpy(tmp_buf, buf, count);
699 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
706 * Truncate file to 'offset' bytes (needed only for file protocols)
708 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
710 BlockDriver *drv = bs->drv;
713 if (!drv->bdrv_truncate)
715 return drv->bdrv_truncate(bs, offset);
719 * Length of a file in bytes. Return < 0 if error or unknown.
721 int64_t bdrv_getlength(BlockDriverState *bs)
723 BlockDriver *drv = bs->drv;
726 if (!drv->bdrv_getlength) {
728 return bs->total_sectors * SECTOR_SIZE;
730 return drv->bdrv_getlength(bs);
733 /* return 0 as number of sectors if no device present or error */
734 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
737 length = bdrv_getlength(bs);
741 length = length >> SECTOR_BITS;
742 *nb_sectors_ptr = length;
746 uint8_t boot_ind; /* 0x80 - active */
747 uint8_t head; /* starting head */
748 uint8_t sector; /* starting sector */
749 uint8_t cyl; /* starting cylinder */
750 uint8_t sys_ind; /* What partition type */
751 uint8_t end_head; /* end head */
752 uint8_t end_sector; /* end sector */
753 uint8_t end_cyl; /* end cylinder */
754 uint32_t start_sect; /* starting sector counting from 0 */
755 uint32_t nr_sects; /* nr of sectors in partition */
756 } __attribute__((packed));
758 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
759 static int guess_disk_lchs(BlockDriverState *bs,
760 int *pcylinders, int *pheads, int *psectors)
763 int ret, i, heads, sectors, cylinders;
768 bdrv_get_geometry(bs, &nb_sectors);
770 ret = bdrv_read(bs, 0, buf, 1);
773 /* test msdos magic */
774 if (buf[510] != 0x55 || buf[511] != 0xaa)
776 for(i = 0; i < 4; i++) {
777 p = ((struct partition *)(buf + 0x1be)) + i;
778 nr_sects = le32_to_cpu(p->nr_sects);
779 if (nr_sects && p->end_head) {
780 /* We make the assumption that the partition terminates on
781 a cylinder boundary */
782 heads = p->end_head + 1;
783 sectors = p->end_sector & 63;
786 cylinders = nb_sectors / (heads * sectors);
787 if (cylinders < 1 || cylinders > 16383)
791 *pcylinders = cylinders;
793 printf("guessed geometry: LCHS=%d %d %d\n",
794 cylinders, heads, sectors);
802 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
804 int translation, lba_detected = 0;
805 int cylinders, heads, secs;
808 /* if a geometry hint is available, use it */
809 bdrv_get_geometry(bs, &nb_sectors);
810 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
811 translation = bdrv_get_translation_hint(bs);
812 if (cylinders != 0) {
817 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
819 /* if heads > 16, it means that a BIOS LBA
820 translation was active, so the default
821 hardware geometry is OK */
823 goto default_geometry;
828 /* disable any translation to be in sync with
829 the logical geometry */
830 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
831 bdrv_set_translation_hint(bs,
832 BIOS_ATA_TRANSLATION_NONE);
837 /* if no geometry, use a standard physical disk geometry */
838 cylinders = nb_sectors / (16 * 63);
840 if (cylinders > 16383)
842 else if (cylinders < 2)
847 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
848 if ((*pcyls * *pheads) <= 131072) {
849 bdrv_set_translation_hint(bs,
850 BIOS_ATA_TRANSLATION_LARGE);
852 bdrv_set_translation_hint(bs,
853 BIOS_ATA_TRANSLATION_LBA);
857 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
861 void bdrv_set_geometry_hint(BlockDriverState *bs,
862 int cyls, int heads, int secs)
869 void bdrv_set_type_hint(BlockDriverState *bs, int type)
872 bs->removable = ((type == BDRV_TYPE_CDROM ||
873 type == BDRV_TYPE_FLOPPY));
876 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
878 bs->translation = translation;
881 void bdrv_get_geometry_hint(BlockDriverState *bs,
882 int *pcyls, int *pheads, int *psecs)
889 int bdrv_get_type_hint(BlockDriverState *bs)
894 int bdrv_get_translation_hint(BlockDriverState *bs)
896 return bs->translation;
899 int bdrv_is_removable(BlockDriverState *bs)
901 return bs->removable;
904 int bdrv_is_read_only(BlockDriverState *bs)
906 return bs->read_only;
909 int bdrv_is_sg(BlockDriverState *bs)
914 /* XXX: no longer used */
915 void bdrv_set_change_cb(BlockDriverState *bs,
916 void (*change_cb)(void *opaque), void *opaque)
918 bs->change_cb = change_cb;
919 bs->change_opaque = opaque;
922 int bdrv_is_encrypted(BlockDriverState *bs)
924 if (bs->backing_hd && bs->backing_hd->encrypted)
926 return bs->encrypted;
929 int bdrv_key_required(BlockDriverState *bs)
931 BlockDriverState *backing_hd = bs->backing_hd;
933 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
935 return (bs->encrypted && !bs->valid_key);
938 int bdrv_set_key(BlockDriverState *bs, const char *key)
941 if (bs->backing_hd && bs->backing_hd->encrypted) {
942 ret = bdrv_set_key(bs->backing_hd, key);
948 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
950 ret = bs->drv->bdrv_set_key(bs, key);
953 } else if (!bs->valid_key) {
955 /* call the change callback now, we skipped it on open */
956 bs->media_changed = 1;
958 bs->change_cb(bs->change_opaque);
963 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
968 pstrcpy(buf, buf_size, bs->drv->format_name);
972 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
977 for (drv = first_drv; drv != NULL; drv = drv->next) {
978 it(opaque, drv->format_name);
982 BlockDriverState *bdrv_find(const char *name)
984 BlockDriverState *bs;
986 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
987 if (!strcmp(name, bs->device_name))
993 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
995 BlockDriverState *bs;
997 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1002 const char *bdrv_get_device_name(BlockDriverState *bs)
1004 return bs->device_name;
1007 void bdrv_flush(BlockDriverState *bs)
1011 if (bs->drv->bdrv_flush)
1012 bs->drv->bdrv_flush(bs);
1014 bdrv_flush(bs->backing_hd);
1017 void bdrv_flush_all(void)
1019 BlockDriverState *bs;
1021 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1022 if (bs->drv && !bdrv_is_read_only(bs) &&
1023 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1028 * Returns true iff the specified sector is present in the disk image. Drivers
1029 * not implementing the functionality are assumed to not support backing files,
1030 * hence all their sectors are reported as allocated.
1032 * 'pnum' is set to the number of sectors (including and immediately following
1033 * the specified sector) that are known to be in the same
1034 * allocated/unallocated state.
1036 * 'nb_sectors' is the max value 'pnum' should be set to.
1038 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1042 if (!bs->drv->bdrv_is_allocated) {
1043 if (sector_num >= bs->total_sectors) {
1047 n = bs->total_sectors - sector_num;
1048 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1051 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1054 void bdrv_info(Monitor *mon)
1056 BlockDriverState *bs;
1058 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1059 monitor_printf(mon, "%s:", bs->device_name);
1060 monitor_printf(mon, " type=");
1063 monitor_printf(mon, "hd");
1065 case BDRV_TYPE_CDROM:
1066 monitor_printf(mon, "cdrom");
1068 case BDRV_TYPE_FLOPPY:
1069 monitor_printf(mon, "floppy");
1072 monitor_printf(mon, " removable=%d", bs->removable);
1073 if (bs->removable) {
1074 monitor_printf(mon, " locked=%d", bs->locked);
1077 monitor_printf(mon, " file=");
1078 monitor_print_filename(mon, bs->filename);
1079 if (bs->backing_file[0] != '\0') {
1080 monitor_printf(mon, " backing_file=");
1081 monitor_print_filename(mon, bs->backing_file);
1083 monitor_printf(mon, " ro=%d", bs->read_only);
1084 monitor_printf(mon, " drv=%s", bs->drv->format_name);
1085 monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
1087 monitor_printf(mon, " [not inserted]");
1089 monitor_printf(mon, "\n");
1093 /* The "info blockstats" command. */
1094 void bdrv_info_stats(Monitor *mon)
1096 BlockDriverState *bs;
1098 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1099 monitor_printf(mon, "%s:"
1100 " rd_bytes=%" PRIu64
1101 " wr_bytes=%" PRIu64
1102 " rd_operations=%" PRIu64
1103 " wr_operations=%" PRIu64
1106 bs->rd_bytes, bs->wr_bytes,
1107 bs->rd_ops, bs->wr_ops);
1111 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1113 if (bs->backing_hd && bs->backing_hd->encrypted)
1114 return bs->backing_file;
1115 else if (bs->encrypted)
1116 return bs->filename;
1121 void bdrv_get_backing_filename(BlockDriverState *bs,
1122 char *filename, int filename_size)
1124 if (!bs->backing_hd) {
1125 pstrcpy(filename, filename_size, "");
1127 pstrcpy(filename, filename_size, bs->backing_file);
1131 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1132 const uint8_t *buf, int nb_sectors)
1134 BlockDriver *drv = bs->drv;
1137 if (!drv->bdrv_write_compressed)
1139 if (bdrv_check_request(bs, sector_num, nb_sectors))
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 int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size)
1157 BlockDriver *drv = bs->drv;
1160 if (!drv->bdrv_put_buffer)
1162 return drv->bdrv_put_buffer(bs, buf, pos, size);
1165 int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size)
1167 BlockDriver *drv = bs->drv;
1170 if (!drv->bdrv_get_buffer)
1172 return drv->bdrv_get_buffer(bs, buf, pos, size);
1175 /**************************************************************/
1176 /* handling of snapshots */
1178 int bdrv_snapshot_create(BlockDriverState *bs,
1179 QEMUSnapshotInfo *sn_info)
1181 BlockDriver *drv = bs->drv;
1184 if (!drv->bdrv_snapshot_create)
1186 return drv->bdrv_snapshot_create(bs, sn_info);
1189 int bdrv_snapshot_goto(BlockDriverState *bs,
1190 const char *snapshot_id)
1192 BlockDriver *drv = bs->drv;
1195 if (!drv->bdrv_snapshot_goto)
1197 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1200 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1202 BlockDriver *drv = bs->drv;
1205 if (!drv->bdrv_snapshot_delete)
1207 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1210 int bdrv_snapshot_list(BlockDriverState *bs,
1211 QEMUSnapshotInfo **psn_info)
1213 BlockDriver *drv = bs->drv;
1216 if (!drv->bdrv_snapshot_list)
1218 return drv->bdrv_snapshot_list(bs, psn_info);
1221 #define NB_SUFFIXES 4
1223 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1225 static const char suffixes[NB_SUFFIXES] = "KMGT";
1230 snprintf(buf, buf_size, "%" PRId64, size);
1233 for(i = 0; i < NB_SUFFIXES; i++) {
1234 if (size < (10 * base)) {
1235 snprintf(buf, buf_size, "%0.1f%c",
1236 (double)size / base,
1239 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1240 snprintf(buf, buf_size, "%" PRId64 "%c",
1241 ((size + (base >> 1)) / base),
1251 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1253 char buf1[128], date_buf[128], clock_buf[128];
1263 snprintf(buf, buf_size,
1264 "%-10s%-20s%7s%20s%15s",
1265 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1269 ptm = localtime(&ti);
1270 strftime(date_buf, sizeof(date_buf),
1271 "%Y-%m-%d %H:%M:%S", ptm);
1273 localtime_r(&ti, &tm);
1274 strftime(date_buf, sizeof(date_buf),
1275 "%Y-%m-%d %H:%M:%S", &tm);
1277 secs = sn->vm_clock_nsec / 1000000000;
1278 snprintf(clock_buf, sizeof(clock_buf),
1279 "%02d:%02d:%02d.%03d",
1281 (int)((secs / 60) % 60),
1283 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1284 snprintf(buf, buf_size,
1285 "%-10s%-20s%7s%20s%15s",
1286 sn->id_str, sn->name,
1287 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1295 /**************************************************************/
1298 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1299 QEMUIOVector *qiov, int nb_sectors,
1300 BlockDriverCompletionFunc *cb, void *opaque)
1302 BlockDriver *drv = bs->drv;
1303 BlockDriverAIOCB *ret;
1307 if (bdrv_check_request(bs, sector_num, nb_sectors))
1310 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1314 /* Update stats even though technically transfer has not happened. */
1315 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1322 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1323 QEMUIOVector *qiov, int nb_sectors,
1324 BlockDriverCompletionFunc *cb, void *opaque)
1326 BlockDriver *drv = bs->drv;
1327 BlockDriverAIOCB *ret;
1333 if (bdrv_check_request(bs, sector_num, nb_sectors))
1336 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1340 /* Update stats even though technically transfer has not happened. */
1341 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1348 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1350 acb->pool->cancel(acb);
1354 /**************************************************************/
1355 /* async block device emulation */
1357 typedef struct BlockDriverAIOCBSync {
1358 BlockDriverAIOCB common;
1361 /* vector translation state */
1365 } BlockDriverAIOCBSync;
1367 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1369 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1370 qemu_bh_cancel(acb->bh);
1371 qemu_aio_release(acb);
1374 static AIOPool bdrv_em_aio_pool = {
1375 .aiocb_size = sizeof(BlockDriverAIOCBSync),
1376 .cancel = bdrv_aio_cancel_em,
1379 static void bdrv_aio_bh_cb(void *opaque)
1381 BlockDriverAIOCBSync *acb = opaque;
1384 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1385 qemu_vfree(acb->bounce);
1386 acb->common.cb(acb->common.opaque, acb->ret);
1388 qemu_aio_release(acb);
1391 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1395 BlockDriverCompletionFunc *cb,
1400 BlockDriverAIOCBSync *acb;
1402 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
1403 acb->is_write = is_write;
1405 acb->bounce = qemu_blockalign(bs, qiov->size);
1408 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1411 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
1412 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
1414 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
1417 qemu_bh_schedule(acb->bh);
1419 return &acb->common;
1422 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
1423 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1424 BlockDriverCompletionFunc *cb, void *opaque)
1426 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1429 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
1430 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1431 BlockDriverCompletionFunc *cb, void *opaque)
1433 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1436 /**************************************************************/
1437 /* sync block device emulation */
1439 static void bdrv_rw_em_cb(void *opaque, int ret)
1441 *(int *)opaque = ret;
1444 #define NOT_DONE 0x7fffffff
1446 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1447 uint8_t *buf, int nb_sectors)
1450 BlockDriverAIOCB *acb;
1454 async_ret = NOT_DONE;
1455 iov.iov_base = (void *)buf;
1456 iov.iov_len = nb_sectors * 512;
1457 qemu_iovec_init_external(&qiov, &iov, 1);
1458 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
1459 bdrv_rw_em_cb, &async_ret);
1463 while (async_ret == NOT_DONE) {
1470 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1471 const uint8_t *buf, int nb_sectors)
1474 BlockDriverAIOCB *acb;
1478 async_ret = NOT_DONE;
1479 iov.iov_base = (void *)buf;
1480 iov.iov_len = nb_sectors * 512;
1481 qemu_iovec_init_external(&qiov, &iov, 1);
1482 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
1483 bdrv_rw_em_cb, &async_ret);
1486 while (async_ret == NOT_DONE) {
1492 void bdrv_init(void)
1494 module_call_init(MODULE_INIT_BLOCK);
1497 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
1498 BlockDriverCompletionFunc *cb, void *opaque)
1500 BlockDriverAIOCB *acb;
1502 if (pool->free_aiocb) {
1503 acb = pool->free_aiocb;
1504 pool->free_aiocb = acb->next;
1506 acb = qemu_mallocz(pool->aiocb_size);
1511 acb->opaque = opaque;
1515 void qemu_aio_release(void *p)
1517 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
1518 AIOPool *pool = acb->pool;
1519 acb->next = pool->free_aiocb;
1520 pool->free_aiocb = acb;
1523 /**************************************************************/
1524 /* removable device support */
1527 * Return TRUE if the media is present
1529 int bdrv_is_inserted(BlockDriverState *bs)
1531 BlockDriver *drv = bs->drv;
1535 if (!drv->bdrv_is_inserted)
1537 ret = drv->bdrv_is_inserted(bs);
1542 * Return TRUE if the media changed since the last call to this
1543 * function. It is currently only used for floppy disks
1545 int bdrv_media_changed(BlockDriverState *bs)
1547 BlockDriver *drv = bs->drv;
1550 if (!drv || !drv->bdrv_media_changed)
1553 ret = drv->bdrv_media_changed(bs);
1554 if (ret == -ENOTSUP)
1555 ret = bs->media_changed;
1556 bs->media_changed = 0;
1561 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1563 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1565 BlockDriver *drv = bs->drv;
1568 if (!drv || !drv->bdrv_eject) {
1571 ret = drv->bdrv_eject(bs, eject_flag);
1573 if (ret == -ENOTSUP) {
1579 int bdrv_is_locked(BlockDriverState *bs)
1585 * Lock or unlock the media (if it is locked, the user won't be able
1586 * to eject it manually).
1588 void bdrv_set_locked(BlockDriverState *bs, int locked)
1590 BlockDriver *drv = bs->drv;
1592 bs->locked = locked;
1593 if (drv && drv->bdrv_set_locked) {
1594 drv->bdrv_set_locked(bs, locked);
1598 /* needed for generic scsi interface */
1600 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1602 BlockDriver *drv = bs->drv;
1604 if (drv && drv->bdrv_ioctl)
1605 return drv->bdrv_ioctl(bs, req, buf);
1609 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
1610 unsigned long int req, void *buf,
1611 BlockDriverCompletionFunc *cb, void *opaque)
1613 BlockDriver *drv = bs->drv;
1615 if (drv && drv->bdrv_aio_ioctl)
1616 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
1620 void *qemu_blockalign(BlockDriverState *bs, size_t size)
1622 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);