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"
25 #include "qemu-common.h"
28 #include "block_int.h"
30 #include "qemu-objects.h"
33 #include <sys/types.h>
35 #include <sys/ioctl.h>
36 #include <sys/queue.h>
46 static BlockDriverAIOCB
*bdrv_aio_readv_em(BlockDriverState
*bs
,
47 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
48 BlockDriverCompletionFunc
*cb
, void *opaque
);
49 static BlockDriverAIOCB
*bdrv_aio_writev_em(BlockDriverState
*bs
,
50 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
51 BlockDriverCompletionFunc
*cb
, void *opaque
);
52 static BlockDriverAIOCB
*bdrv_aio_flush_em(BlockDriverState
*bs
,
53 BlockDriverCompletionFunc
*cb
, void *opaque
);
54 static BlockDriverAIOCB
*bdrv_aio_noop_em(BlockDriverState
*bs
,
55 BlockDriverCompletionFunc
*cb
, void *opaque
);
56 static int bdrv_read_em(BlockDriverState
*bs
, int64_t sector_num
,
57 uint8_t *buf
, int nb_sectors
);
58 static int bdrv_write_em(BlockDriverState
*bs
, int64_t sector_num
,
59 const uint8_t *buf
, int nb_sectors
);
61 static QTAILQ_HEAD(, BlockDriverState
) bdrv_states
=
62 QTAILQ_HEAD_INITIALIZER(bdrv_states
);
64 static QLIST_HEAD(, BlockDriver
) bdrv_drivers
=
65 QLIST_HEAD_INITIALIZER(bdrv_drivers
);
67 /* The device to use for VM snapshots */
68 static BlockDriverState
*bs_snapshots
;
70 /* If non-zero, use only whitelisted block drivers */
71 static int use_bdrv_whitelist
;
74 static int is_windows_drive_prefix(const char *filename
)
76 return (((filename
[0] >= 'a' && filename
[0] <= 'z') ||
77 (filename
[0] >= 'A' && filename
[0] <= 'Z')) &&
81 int is_windows_drive(const char *filename
)
83 if (is_windows_drive_prefix(filename
) &&
86 if (strstart(filename
, "\\\\.\\", NULL
) ||
87 strstart(filename
, "//./", NULL
))
93 /* check if the path starts with "<protocol>:" */
94 static int path_has_protocol(const char *path
)
97 if (is_windows_drive(path
) ||
98 is_windows_drive_prefix(path
)) {
103 return strchr(path
, ':') != NULL
;
106 int path_is_absolute(const char *path
)
110 /* specific case for names like: "\\.\d:" */
111 if (*path
== '/' || *path
== '\\')
114 p
= strchr(path
, ':');
120 return (*p
== '/' || *p
== '\\');
126 /* if filename is absolute, just copy it to dest. Otherwise, build a
127 path to it by considering it is relative to base_path. URL are
129 void path_combine(char *dest
, int dest_size
,
130 const char *base_path
,
131 const char *filename
)
138 if (path_is_absolute(filename
)) {
139 pstrcpy(dest
, dest_size
, filename
);
141 p
= strchr(base_path
, ':');
146 p1
= strrchr(base_path
, '/');
150 p2
= strrchr(base_path
, '\\');
162 if (len
> dest_size
- 1)
164 memcpy(dest
, base_path
, len
);
166 pstrcat(dest
, dest_size
, filename
);
170 void bdrv_register(BlockDriver
*bdrv
)
172 if (!bdrv
->bdrv_aio_readv
) {
173 /* add AIO emulation layer */
174 bdrv
->bdrv_aio_readv
= bdrv_aio_readv_em
;
175 bdrv
->bdrv_aio_writev
= bdrv_aio_writev_em
;
176 } else if (!bdrv
->bdrv_read
) {
177 /* add synchronous IO emulation layer */
178 bdrv
->bdrv_read
= bdrv_read_em
;
179 bdrv
->bdrv_write
= bdrv_write_em
;
182 if (!bdrv
->bdrv_aio_flush
)
183 bdrv
->bdrv_aio_flush
= bdrv_aio_flush_em
;
185 QLIST_INSERT_HEAD(&bdrv_drivers
, bdrv
, list
);
188 /* create a new block device (by default it is empty) */
189 BlockDriverState
*bdrv_new(const char *device_name
)
191 BlockDriverState
*bs
;
193 bs
= qemu_mallocz(sizeof(BlockDriverState
));
194 pstrcpy(bs
->device_name
, sizeof(bs
->device_name
), device_name
);
195 if (device_name
[0] != '\0') {
196 QTAILQ_INSERT_TAIL(&bdrv_states
, bs
, list
);
201 BlockDriver
*bdrv_find_format(const char *format_name
)
204 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
205 if (!strcmp(drv1
->format_name
, format_name
)) {
212 static int bdrv_is_whitelisted(BlockDriver
*drv
)
214 static const char *whitelist
[] = {
215 CONFIG_BDRV_WHITELIST
220 return 1; /* no whitelist, anything goes */
222 for (p
= whitelist
; *p
; p
++) {
223 if (!strcmp(drv
->format_name
, *p
)) {
230 BlockDriver
*bdrv_find_whitelisted_format(const char *format_name
)
232 BlockDriver
*drv
= bdrv_find_format(format_name
);
233 return drv
&& bdrv_is_whitelisted(drv
) ? drv
: NULL
;
236 int bdrv_create(BlockDriver
*drv
, const char* filename
,
237 QEMUOptionParameter
*options
)
239 if (!drv
->bdrv_create
)
242 return drv
->bdrv_create(filename
, options
);
245 int bdrv_create_file(const char* filename
, QEMUOptionParameter
*options
)
249 drv
= bdrv_find_protocol(filename
);
254 return bdrv_create(drv
, filename
, options
);
258 void get_tmp_filename(char *filename
, int size
)
260 char temp_dir
[MAX_PATH
];
262 GetTempPath(MAX_PATH
, temp_dir
);
263 GetTempFileName(temp_dir
, "qem", 0, filename
);
266 void get_tmp_filename(char *filename
, int size
)
270 /* XXX: race condition possible */
271 tmpdir
= getenv("TMPDIR");
274 snprintf(filename
, size
, "%s/vl.XXXXXX", tmpdir
);
275 fd
= mkstemp(filename
);
281 * Detect host devices. By convention, /dev/cdrom[N] is always
282 * recognized as a host CDROM.
284 static BlockDriver
*find_hdev_driver(const char *filename
)
286 int score_max
= 0, score
;
287 BlockDriver
*drv
= NULL
, *d
;
289 QLIST_FOREACH(d
, &bdrv_drivers
, list
) {
290 if (d
->bdrv_probe_device
) {
291 score
= d
->bdrv_probe_device(filename
);
292 if (score
> score_max
) {
302 BlockDriver
*bdrv_find_protocol(const char *filename
)
309 /* TODO Drivers without bdrv_file_open must be specified explicitly */
312 * XXX(hch): we really should not let host device detection
313 * override an explicit protocol specification, but moving this
314 * later breaks access to device names with colons in them.
315 * Thanks to the brain-dead persistent naming schemes on udev-
316 * based Linux systems those actually are quite common.
318 drv1
= find_hdev_driver(filename
);
323 if (!path_has_protocol(filename
)) {
324 return bdrv_find_format("file");
326 p
= strchr(filename
, ':');
329 if (len
> sizeof(protocol
) - 1)
330 len
= sizeof(protocol
) - 1;
331 memcpy(protocol
, filename
, len
);
332 protocol
[len
] = '\0';
333 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
334 if (drv1
->protocol_name
&&
335 !strcmp(drv1
->protocol_name
, protocol
)) {
342 static int find_image_format(const char *filename
, BlockDriver
**pdrv
)
344 int ret
, score
, score_max
;
345 BlockDriver
*drv1
, *drv
;
347 BlockDriverState
*bs
;
349 ret
= bdrv_file_open(&bs
, filename
, 0);
355 /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
356 if (bs
->sg
|| !bdrv_is_inserted(bs
)) {
358 drv
= bdrv_find_format("raw");
366 ret
= bdrv_pread(bs
, 0, buf
, sizeof(buf
));
375 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
376 if (drv1
->bdrv_probe
) {
377 score
= drv1
->bdrv_probe(buf
, ret
, filename
);
378 if (score
> score_max
) {
392 * Set the current 'total_sectors' value
394 static int refresh_total_sectors(BlockDriverState
*bs
, int64_t hint
)
396 BlockDriver
*drv
= bs
->drv
;
398 /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
402 /* query actual device if possible, otherwise just trust the hint */
403 if (drv
->bdrv_getlength
) {
404 int64_t length
= drv
->bdrv_getlength(bs
);
408 hint
= length
>> BDRV_SECTOR_BITS
;
411 bs
->total_sectors
= hint
;
416 * Common part for opening disk images and files
418 static int bdrv_open_common(BlockDriverState
*bs
, const char *filename
,
419 int flags
, BlockDriver
*drv
)
426 bs
->total_sectors
= 0;
429 bs
->open_flags
= flags
;
430 /* buffer_alignment defaulted to 512, drivers can change this value */
431 bs
->buffer_alignment
= 512;
433 pstrcpy(bs
->filename
, sizeof(bs
->filename
), filename
);
435 if (use_bdrv_whitelist
&& !bdrv_is_whitelisted(drv
)) {
440 bs
->opaque
= qemu_mallocz(drv
->instance_size
);
443 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
444 * write cache to the guest. We do need the fdatasync to flush
445 * out transactions for block allocations, and we maybe have a
446 * volatile write cache in our backing device to deal with.
448 if (flags
& (BDRV_O_CACHE_WB
|BDRV_O_NOCACHE
))
449 bs
->enable_write_cache
= 1;
452 * Clear flags that are internal to the block layer before opening the
455 open_flags
= flags
& ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
458 * Snapshots should be writeable.
460 if (bs
->is_temporary
) {
461 open_flags
|= BDRV_O_RDWR
;
464 /* Open the image, either directly or using a protocol */
465 if (drv
->bdrv_file_open
) {
466 ret
= drv
->bdrv_file_open(bs
, filename
, open_flags
);
468 ret
= bdrv_file_open(&bs
->file
, filename
, open_flags
);
470 ret
= drv
->bdrv_open(bs
, open_flags
);
478 bs
->keep_read_only
= bs
->read_only
= !(open_flags
& BDRV_O_RDWR
);
480 ret
= refresh_total_sectors(bs
, bs
->total_sectors
);
486 if (bs
->is_temporary
) {
494 bdrv_delete(bs
->file
);
497 qemu_free(bs
->opaque
);
504 * Opens a file using a protocol (file, host_device, nbd, ...)
506 int bdrv_file_open(BlockDriverState
**pbs
, const char *filename
, int flags
)
508 BlockDriverState
*bs
;
512 drv
= bdrv_find_protocol(filename
);
518 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
529 * Opens a disk image (raw, qcow2, vmdk, ...)
531 int bdrv_open(BlockDriverState
*bs
, const char *filename
, int flags
,
536 if (flags
& BDRV_O_SNAPSHOT
) {
537 BlockDriverState
*bs1
;
540 BlockDriver
*bdrv_qcow2
;
541 QEMUOptionParameter
*options
;
542 char tmp_filename
[PATH_MAX
];
543 char backing_filename
[PATH_MAX
];
545 /* if snapshot, we create a temporary backing file and open it
546 instead of opening 'filename' directly */
548 /* if there is a backing file, use it */
550 ret
= bdrv_open(bs1
, filename
, 0, drv
);
555 total_size
= bdrv_getlength(bs1
) & BDRV_SECTOR_MASK
;
557 if (bs1
->drv
&& bs1
->drv
->protocol_name
)
562 get_tmp_filename(tmp_filename
, sizeof(tmp_filename
));
564 /* Real path is meaningless for protocols */
566 snprintf(backing_filename
, sizeof(backing_filename
),
568 else if (!realpath(filename
, backing_filename
))
571 bdrv_qcow2
= bdrv_find_format("qcow2");
572 options
= parse_option_parameters("", bdrv_qcow2
->create_options
, NULL
);
574 set_option_parameter_int(options
, BLOCK_OPT_SIZE
, total_size
);
575 set_option_parameter(options
, BLOCK_OPT_BACKING_FILE
, backing_filename
);
577 set_option_parameter(options
, BLOCK_OPT_BACKING_FMT
,
581 ret
= bdrv_create(bdrv_qcow2
, tmp_filename
, options
);
582 free_option_parameters(options
);
587 filename
= tmp_filename
;
589 bs
->is_temporary
= 1;
592 /* Find the right image format driver */
594 ret
= find_image_format(filename
, &drv
);
598 goto unlink_and_fail
;
602 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
604 goto unlink_and_fail
;
607 /* If there is a backing file, use it */
608 if ((flags
& BDRV_O_NO_BACKING
) == 0 && bs
->backing_file
[0] != '\0') {
609 char backing_filename
[PATH_MAX
];
611 BlockDriver
*back_drv
= NULL
;
613 bs
->backing_hd
= bdrv_new("");
615 if (path_has_protocol(bs
->backing_file
)) {
616 pstrcpy(backing_filename
, sizeof(backing_filename
),
619 path_combine(backing_filename
, sizeof(backing_filename
),
620 filename
, bs
->backing_file
);
623 if (bs
->backing_format
[0] != '\0') {
624 back_drv
= bdrv_find_format(bs
->backing_format
);
627 /* backing files always opened read-only */
629 flags
& ~(BDRV_O_RDWR
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
631 ret
= bdrv_open(bs
->backing_hd
, backing_filename
, back_flags
, back_drv
);
636 if (bs
->is_temporary
) {
637 bs
->backing_hd
->keep_read_only
= !(flags
& BDRV_O_RDWR
);
639 /* base image inherits from "parent" */
640 bs
->backing_hd
->keep_read_only
= bs
->keep_read_only
;
644 if (!bdrv_key_required(bs
)) {
645 /* call the change callback */
646 bs
->media_changed
= 1;
648 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
654 if (bs
->is_temporary
) {
660 void bdrv_close(BlockDriverState
*bs
)
663 if (bs
== bs_snapshots
) {
666 if (bs
->backing_hd
) {
667 bdrv_delete(bs
->backing_hd
);
668 bs
->backing_hd
= NULL
;
670 bs
->drv
->bdrv_close(bs
);
671 qemu_free(bs
->opaque
);
673 if (bs
->is_temporary
) {
674 unlink(bs
->filename
);
680 if (bs
->file
!= NULL
) {
681 bdrv_close(bs
->file
);
684 /* call the change callback */
685 bs
->media_changed
= 1;
687 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
691 void bdrv_close_all(void)
693 BlockDriverState
*bs
;
695 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
700 void bdrv_delete(BlockDriverState
*bs
)
704 /* remove from list, if necessary */
705 if (bs
->device_name
[0] != '\0') {
706 QTAILQ_REMOVE(&bdrv_states
, bs
, list
);
710 if (bs
->file
!= NULL
) {
711 bdrv_delete(bs
->file
);
714 assert(bs
!= bs_snapshots
);
718 int bdrv_attach(BlockDriverState
*bs
, DeviceState
*qdev
)
727 void bdrv_detach(BlockDriverState
*bs
, DeviceState
*qdev
)
729 assert(bs
->peer
== qdev
);
733 DeviceState
*bdrv_get_attached(BlockDriverState
*bs
)
739 * Run consistency checks on an image
741 * Returns 0 if the check could be completed (it doesn't mean that the image is
742 * free of errors) or -errno when an internal error occured. The results of the
743 * check are stored in res.
745 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
)
747 if (bs
->drv
->bdrv_check
== NULL
) {
751 memset(res
, 0, sizeof(*res
));
752 return bs
->drv
->bdrv_check(bs
, res
);
755 #define COMMIT_BUF_SECTORS 2048
757 /* commit COW file into the raw image */
758 int bdrv_commit(BlockDriverState
*bs
)
760 BlockDriver
*drv
= bs
->drv
;
761 BlockDriver
*backing_drv
;
762 int64_t sector
, total_sectors
;
763 int n
, ro
, open_flags
;
764 int ret
= 0, rw_ret
= 0;
767 BlockDriverState
*bs_rw
, *bs_ro
;
772 if (!bs
->backing_hd
) {
776 if (bs
->backing_hd
->keep_read_only
) {
780 backing_drv
= bs
->backing_hd
->drv
;
781 ro
= bs
->backing_hd
->read_only
;
782 strncpy(filename
, bs
->backing_hd
->filename
, sizeof(filename
));
783 open_flags
= bs
->backing_hd
->open_flags
;
787 bdrv_delete(bs
->backing_hd
);
788 bs
->backing_hd
= NULL
;
789 bs_rw
= bdrv_new("");
790 rw_ret
= bdrv_open(bs_rw
, filename
, open_flags
| BDRV_O_RDWR
,
794 /* try to re-open read-only */
795 bs_ro
= bdrv_new("");
796 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
800 /* drive not functional anymore */
804 bs
->backing_hd
= bs_ro
;
807 bs
->backing_hd
= bs_rw
;
810 total_sectors
= bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
;
811 buf
= qemu_malloc(COMMIT_BUF_SECTORS
* BDRV_SECTOR_SIZE
);
813 for (sector
= 0; sector
< total_sectors
; sector
+= n
) {
814 if (drv
->bdrv_is_allocated(bs
, sector
, COMMIT_BUF_SECTORS
, &n
)) {
816 if (bdrv_read(bs
, sector
, buf
, n
) != 0) {
821 if (bdrv_write(bs
->backing_hd
, sector
, buf
, n
) != 0) {
828 if (drv
->bdrv_make_empty
) {
829 ret
= drv
->bdrv_make_empty(bs
);
834 * Make sure all data we wrote to the backing device is actually
838 bdrv_flush(bs
->backing_hd
);
845 bdrv_delete(bs
->backing_hd
);
846 bs
->backing_hd
= NULL
;
847 bs_ro
= bdrv_new("");
848 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
852 /* drive not functional anymore */
856 bs
->backing_hd
= bs_ro
;
857 bs
->backing_hd
->keep_read_only
= 0;
863 void bdrv_commit_all(void)
865 BlockDriverState
*bs
;
867 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
875 * -EINVAL - backing format specified, but no file
876 * -ENOSPC - can't update the backing file because no space is left in the
878 * -ENOTSUP - format driver doesn't support changing the backing file
880 int bdrv_change_backing_file(BlockDriverState
*bs
,
881 const char *backing_file
, const char *backing_fmt
)
883 BlockDriver
*drv
= bs
->drv
;
885 if (drv
->bdrv_change_backing_file
!= NULL
) {
886 return drv
->bdrv_change_backing_file(bs
, backing_file
, backing_fmt
);
892 static int bdrv_check_byte_request(BlockDriverState
*bs
, int64_t offset
,
897 if (!bdrv_is_inserted(bs
))
903 len
= bdrv_getlength(bs
);
908 if ((offset
> len
) || (len
- offset
< size
))
914 static int bdrv_check_request(BlockDriverState
*bs
, int64_t sector_num
,
917 return bdrv_check_byte_request(bs
, sector_num
* BDRV_SECTOR_SIZE
,
918 nb_sectors
* BDRV_SECTOR_SIZE
);
921 /* return < 0 if error. See bdrv_write() for the return codes */
922 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
923 uint8_t *buf
, int nb_sectors
)
925 BlockDriver
*drv
= bs
->drv
;
929 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
932 return drv
->bdrv_read(bs
, sector_num
, buf
, nb_sectors
);
935 static void set_dirty_bitmap(BlockDriverState
*bs
, int64_t sector_num
,
936 int nb_sectors
, int dirty
)
939 unsigned long val
, idx
, bit
;
941 start
= sector_num
/ BDRV_SECTORS_PER_DIRTY_CHUNK
;
942 end
= (sector_num
+ nb_sectors
- 1) / BDRV_SECTORS_PER_DIRTY_CHUNK
;
944 for (; start
<= end
; start
++) {
945 idx
= start
/ (sizeof(unsigned long) * 8);
946 bit
= start
% (sizeof(unsigned long) * 8);
947 val
= bs
->dirty_bitmap
[idx
];
949 if (!(val
& (1UL << bit
))) {
954 if (val
& (1UL << bit
)) {
956 val
&= ~(1UL << bit
);
959 bs
->dirty_bitmap
[idx
] = val
;
963 /* Return < 0 if error. Important errors are:
964 -EIO generic I/O error (may happen for all errors)
965 -ENOMEDIUM No media inserted.
966 -EINVAL Invalid sector number or nb_sectors
967 -EACCES Trying to write a read-only device
969 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
970 const uint8_t *buf
, int nb_sectors
)
972 BlockDriver
*drv
= bs
->drv
;
977 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
980 if (bs
->dirty_bitmap
) {
981 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
984 if (bs
->wr_highest_sector
< sector_num
+ nb_sectors
- 1) {
985 bs
->wr_highest_sector
= sector_num
+ nb_sectors
- 1;
988 return drv
->bdrv_write(bs
, sector_num
, buf
, nb_sectors
);
991 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
992 void *buf
, int count1
)
994 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
995 int len
, nb_sectors
, count
;
1000 /* first read to align to sector start */
1001 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1004 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1006 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1008 memcpy(buf
, tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), len
);
1016 /* read the sectors "in place" */
1017 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1018 if (nb_sectors
> 0) {
1019 if ((ret
= bdrv_read(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1021 sector_num
+= nb_sectors
;
1022 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1027 /* add data from the last sector */
1029 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1031 memcpy(buf
, tmp_buf
, count
);
1036 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
1037 const void *buf
, int count1
)
1039 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
1040 int len
, nb_sectors
, count
;
1045 /* first write to align to sector start */
1046 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1049 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1051 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1053 memcpy(tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), buf
, len
);
1054 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1063 /* write the sectors "in place" */
1064 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1065 if (nb_sectors
> 0) {
1066 if ((ret
= bdrv_write(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1068 sector_num
+= nb_sectors
;
1069 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1074 /* add data from the last sector */
1076 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1078 memcpy(tmp_buf
, buf
, count
);
1079 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1086 * Writes to the file and ensures that no writes are reordered across this
1087 * request (acts as a barrier)
1089 * Returns 0 on success, -errno in error cases.
1091 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
1092 const void *buf
, int count
)
1096 ret
= bdrv_pwrite(bs
, offset
, buf
, count
);
1101 /* No flush needed for cache=writethrough, it uses O_DSYNC */
1102 if ((bs
->open_flags
& BDRV_O_CACHE_MASK
) != 0) {
1110 * Writes to the file and ensures that no writes are reordered across this
1111 * request (acts as a barrier)
1113 * Returns 0 on success, -errno in error cases.
1115 int bdrv_write_sync(BlockDriverState
*bs
, int64_t sector_num
,
1116 const uint8_t *buf
, int nb_sectors
)
1118 return bdrv_pwrite_sync(bs
, BDRV_SECTOR_SIZE
* sector_num
,
1119 buf
, BDRV_SECTOR_SIZE
* nb_sectors
);
1123 * Truncate file to 'offset' bytes (needed only for file protocols)
1125 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
)
1127 BlockDriver
*drv
= bs
->drv
;
1131 if (!drv
->bdrv_truncate
)
1135 ret
= drv
->bdrv_truncate(bs
, offset
);
1137 ret
= refresh_total_sectors(bs
, offset
>> BDRV_SECTOR_BITS
);
1138 if (bs
->change_cb
) {
1139 bs
->change_cb(bs
->change_opaque
, CHANGE_SIZE
);
1146 * Length of a file in bytes. Return < 0 if error or unknown.
1148 int64_t bdrv_getlength(BlockDriverState
*bs
)
1150 BlockDriver
*drv
= bs
->drv
;
1154 /* Fixed size devices use the total_sectors value for speed instead of
1155 issuing a length query (like lseek) on each call. Also, legacy block
1156 drivers don't provide a bdrv_getlength function and must use
1158 if (!bs
->growable
|| !drv
->bdrv_getlength
) {
1159 return bs
->total_sectors
* BDRV_SECTOR_SIZE
;
1161 return drv
->bdrv_getlength(bs
);
1164 /* return 0 as number of sectors if no device present or error */
1165 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
)
1168 length
= bdrv_getlength(bs
);
1172 length
= length
>> BDRV_SECTOR_BITS
;
1173 *nb_sectors_ptr
= length
;
1177 uint8_t boot_ind
; /* 0x80 - active */
1178 uint8_t head
; /* starting head */
1179 uint8_t sector
; /* starting sector */
1180 uint8_t cyl
; /* starting cylinder */
1181 uint8_t sys_ind
; /* What partition type */
1182 uint8_t end_head
; /* end head */
1183 uint8_t end_sector
; /* end sector */
1184 uint8_t end_cyl
; /* end cylinder */
1185 uint32_t start_sect
; /* starting sector counting from 0 */
1186 uint32_t nr_sects
; /* nr of sectors in partition */
1187 } __attribute__((packed
));
1189 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1190 static int guess_disk_lchs(BlockDriverState
*bs
,
1191 int *pcylinders
, int *pheads
, int *psectors
)
1193 uint8_t buf
[BDRV_SECTOR_SIZE
];
1194 int ret
, i
, heads
, sectors
, cylinders
;
1195 struct partition
*p
;
1197 uint64_t nb_sectors
;
1199 bdrv_get_geometry(bs
, &nb_sectors
);
1201 ret
= bdrv_read(bs
, 0, buf
, 1);
1204 /* test msdos magic */
1205 if (buf
[510] != 0x55 || buf
[511] != 0xaa)
1207 for(i
= 0; i
< 4; i
++) {
1208 p
= ((struct partition
*)(buf
+ 0x1be)) + i
;
1209 nr_sects
= le32_to_cpu(p
->nr_sects
);
1210 if (nr_sects
&& p
->end_head
) {
1211 /* We make the assumption that the partition terminates on
1212 a cylinder boundary */
1213 heads
= p
->end_head
+ 1;
1214 sectors
= p
->end_sector
& 63;
1217 cylinders
= nb_sectors
/ (heads
* sectors
);
1218 if (cylinders
< 1 || cylinders
> 16383)
1221 *psectors
= sectors
;
1222 *pcylinders
= cylinders
;
1224 printf("guessed geometry: LCHS=%d %d %d\n",
1225 cylinders
, heads
, sectors
);
1233 void bdrv_guess_geometry(BlockDriverState
*bs
, int *pcyls
, int *pheads
, int *psecs
)
1235 int translation
, lba_detected
= 0;
1236 int cylinders
, heads
, secs
;
1237 uint64_t nb_sectors
;
1239 /* if a geometry hint is available, use it */
1240 bdrv_get_geometry(bs
, &nb_sectors
);
1241 bdrv_get_geometry_hint(bs
, &cylinders
, &heads
, &secs
);
1242 translation
= bdrv_get_translation_hint(bs
);
1243 if (cylinders
!= 0) {
1248 if (guess_disk_lchs(bs
, &cylinders
, &heads
, &secs
) == 0) {
1250 /* if heads > 16, it means that a BIOS LBA
1251 translation was active, so the default
1252 hardware geometry is OK */
1254 goto default_geometry
;
1259 /* disable any translation to be in sync with
1260 the logical geometry */
1261 if (translation
== BIOS_ATA_TRANSLATION_AUTO
) {
1262 bdrv_set_translation_hint(bs
,
1263 BIOS_ATA_TRANSLATION_NONE
);
1268 /* if no geometry, use a standard physical disk geometry */
1269 cylinders
= nb_sectors
/ (16 * 63);
1271 if (cylinders
> 16383)
1273 else if (cylinders
< 2)
1278 if ((lba_detected
== 1) && (translation
== BIOS_ATA_TRANSLATION_AUTO
)) {
1279 if ((*pcyls
* *pheads
) <= 131072) {
1280 bdrv_set_translation_hint(bs
,
1281 BIOS_ATA_TRANSLATION_LARGE
);
1283 bdrv_set_translation_hint(bs
,
1284 BIOS_ATA_TRANSLATION_LBA
);
1288 bdrv_set_geometry_hint(bs
, *pcyls
, *pheads
, *psecs
);
1292 void bdrv_set_geometry_hint(BlockDriverState
*bs
,
1293 int cyls
, int heads
, int secs
)
1300 void bdrv_set_type_hint(BlockDriverState
*bs
, int type
)
1303 bs
->removable
= ((type
== BDRV_TYPE_CDROM
||
1304 type
== BDRV_TYPE_FLOPPY
));
1307 void bdrv_set_translation_hint(BlockDriverState
*bs
, int translation
)
1309 bs
->translation
= translation
;
1312 void bdrv_get_geometry_hint(BlockDriverState
*bs
,
1313 int *pcyls
, int *pheads
, int *psecs
)
1316 *pheads
= bs
->heads
;
1320 int bdrv_get_type_hint(BlockDriverState
*bs
)
1325 int bdrv_get_translation_hint(BlockDriverState
*bs
)
1327 return bs
->translation
;
1330 void bdrv_set_on_error(BlockDriverState
*bs
, BlockErrorAction on_read_error
,
1331 BlockErrorAction on_write_error
)
1333 bs
->on_read_error
= on_read_error
;
1334 bs
->on_write_error
= on_write_error
;
1337 BlockErrorAction
bdrv_get_on_error(BlockDriverState
*bs
, int is_read
)
1339 return is_read
? bs
->on_read_error
: bs
->on_write_error
;
1342 void bdrv_set_removable(BlockDriverState
*bs
, int removable
)
1344 bs
->removable
= removable
;
1345 if (removable
&& bs
== bs_snapshots
) {
1346 bs_snapshots
= NULL
;
1350 int bdrv_is_removable(BlockDriverState
*bs
)
1352 return bs
->removable
;
1355 int bdrv_is_read_only(BlockDriverState
*bs
)
1357 return bs
->read_only
;
1360 int bdrv_is_sg(BlockDriverState
*bs
)
1365 int bdrv_enable_write_cache(BlockDriverState
*bs
)
1367 return bs
->enable_write_cache
;
1370 /* XXX: no longer used */
1371 void bdrv_set_change_cb(BlockDriverState
*bs
,
1372 void (*change_cb
)(void *opaque
, int reason
),
1375 bs
->change_cb
= change_cb
;
1376 bs
->change_opaque
= opaque
;
1379 int bdrv_is_encrypted(BlockDriverState
*bs
)
1381 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
1383 return bs
->encrypted
;
1386 int bdrv_key_required(BlockDriverState
*bs
)
1388 BlockDriverState
*backing_hd
= bs
->backing_hd
;
1390 if (backing_hd
&& backing_hd
->encrypted
&& !backing_hd
->valid_key
)
1392 return (bs
->encrypted
&& !bs
->valid_key
);
1395 int bdrv_set_key(BlockDriverState
*bs
, const char *key
)
1398 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
) {
1399 ret
= bdrv_set_key(bs
->backing_hd
, key
);
1405 if (!bs
->encrypted
) {
1407 } else if (!bs
->drv
|| !bs
->drv
->bdrv_set_key
) {
1410 ret
= bs
->drv
->bdrv_set_key(bs
, key
);
1413 } else if (!bs
->valid_key
) {
1415 /* call the change callback now, we skipped it on open */
1416 bs
->media_changed
= 1;
1418 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
1423 void bdrv_get_format(BlockDriverState
*bs
, char *buf
, int buf_size
)
1428 pstrcpy(buf
, buf_size
, bs
->drv
->format_name
);
1432 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
1437 QLIST_FOREACH(drv
, &bdrv_drivers
, list
) {
1438 it(opaque
, drv
->format_name
);
1442 BlockDriverState
*bdrv_find(const char *name
)
1444 BlockDriverState
*bs
;
1446 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1447 if (!strcmp(name
, bs
->device_name
)) {
1454 BlockDriverState
*bdrv_next(BlockDriverState
*bs
)
1457 return QTAILQ_FIRST(&bdrv_states
);
1459 return QTAILQ_NEXT(bs
, list
);
1462 void bdrv_iterate(void (*it
)(void *opaque
, BlockDriverState
*bs
), void *opaque
)
1464 BlockDriverState
*bs
;
1466 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1471 const char *bdrv_get_device_name(BlockDriverState
*bs
)
1473 return bs
->device_name
;
1476 int bdrv_flush(BlockDriverState
*bs
)
1478 if (bs
->open_flags
& BDRV_O_NO_FLUSH
) {
1482 if (bs
->drv
&& bs
->drv
->bdrv_flush
) {
1483 return bs
->drv
->bdrv_flush(bs
);
1487 * Some block drivers always operate in either writethrough or unsafe mode
1488 * and don't support bdrv_flush therefore. Usually qemu doesn't know how
1489 * the server works (because the behaviour is hardcoded or depends on
1490 * server-side configuration), so we can't ensure that everything is safe
1491 * on disk. Returning an error doesn't work because that would break guests
1492 * even if the server operates in writethrough mode.
1494 * Let's hope the user knows what he's doing.
1499 void bdrv_flush_all(void)
1501 BlockDriverState
*bs
;
1503 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1504 if (bs
->drv
&& !bdrv_is_read_only(bs
) &&
1505 (!bdrv_is_removable(bs
) || bdrv_is_inserted(bs
))) {
1511 int bdrv_has_zero_init(BlockDriverState
*bs
)
1515 if (bs
->drv
->bdrv_has_zero_init
) {
1516 return bs
->drv
->bdrv_has_zero_init(bs
);
1522 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
)
1527 if (!bs
->drv
->bdrv_discard
) {
1530 return bs
->drv
->bdrv_discard(bs
, sector_num
, nb_sectors
);
1534 * Returns true iff the specified sector is present in the disk image. Drivers
1535 * not implementing the functionality are assumed to not support backing files,
1536 * hence all their sectors are reported as allocated.
1538 * 'pnum' is set to the number of sectors (including and immediately following
1539 * the specified sector) that are known to be in the same
1540 * allocated/unallocated state.
1542 * 'nb_sectors' is the max value 'pnum' should be set to.
1544 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
1548 if (!bs
->drv
->bdrv_is_allocated
) {
1549 if (sector_num
>= bs
->total_sectors
) {
1553 n
= bs
->total_sectors
- sector_num
;
1554 *pnum
= (n
< nb_sectors
) ? (n
) : (nb_sectors
);
1557 return bs
->drv
->bdrv_is_allocated(bs
, sector_num
, nb_sectors
, pnum
);
1560 void bdrv_mon_event(const BlockDriverState
*bdrv
,
1561 BlockMonEventAction action
, int is_read
)
1564 const char *action_str
;
1567 case BDRV_ACTION_REPORT
:
1568 action_str
= "report";
1570 case BDRV_ACTION_IGNORE
:
1571 action_str
= "ignore";
1573 case BDRV_ACTION_STOP
:
1574 action_str
= "stop";
1580 data
= qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1583 is_read
? "read" : "write");
1584 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR
, data
);
1586 qobject_decref(data
);
1589 static void bdrv_print_dict(QObject
*obj
, void *opaque
)
1592 Monitor
*mon
= opaque
;
1594 bs_dict
= qobject_to_qdict(obj
);
1596 monitor_printf(mon
, "%s: type=%s removable=%d",
1597 qdict_get_str(bs_dict
, "device"),
1598 qdict_get_str(bs_dict
, "type"),
1599 qdict_get_bool(bs_dict
, "removable"));
1601 if (qdict_get_bool(bs_dict
, "removable")) {
1602 monitor_printf(mon
, " locked=%d", qdict_get_bool(bs_dict
, "locked"));
1605 if (qdict_haskey(bs_dict
, "inserted")) {
1606 QDict
*qdict
= qobject_to_qdict(qdict_get(bs_dict
, "inserted"));
1608 monitor_printf(mon
, " file=");
1609 monitor_print_filename(mon
, qdict_get_str(qdict
, "file"));
1610 if (qdict_haskey(qdict
, "backing_file")) {
1611 monitor_printf(mon
, " backing_file=");
1612 monitor_print_filename(mon
, qdict_get_str(qdict
, "backing_file"));
1614 monitor_printf(mon
, " ro=%d drv=%s encrypted=%d",
1615 qdict_get_bool(qdict
, "ro"),
1616 qdict_get_str(qdict
, "drv"),
1617 qdict_get_bool(qdict
, "encrypted"));
1619 monitor_printf(mon
, " [not inserted]");
1622 monitor_printf(mon
, "\n");
1625 void bdrv_info_print(Monitor
*mon
, const QObject
*data
)
1627 qlist_iter(qobject_to_qlist(data
), bdrv_print_dict
, mon
);
1630 void bdrv_info(Monitor
*mon
, QObject
**ret_data
)
1633 BlockDriverState
*bs
;
1635 bs_list
= qlist_new();
1637 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1639 const char *type
= "unknown";
1645 case BDRV_TYPE_CDROM
:
1648 case BDRV_TYPE_FLOPPY
:
1653 bs_obj
= qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1654 "'removable': %i, 'locked': %i }",
1655 bs
->device_name
, type
, bs
->removable
,
1660 QDict
*bs_dict
= qobject_to_qdict(bs_obj
);
1662 obj
= qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1663 "'encrypted': %i }",
1664 bs
->filename
, bs
->read_only
,
1665 bs
->drv
->format_name
,
1666 bdrv_is_encrypted(bs
));
1667 if (bs
->backing_file
[0] != '\0') {
1668 QDict
*qdict
= qobject_to_qdict(obj
);
1669 qdict_put(qdict
, "backing_file",
1670 qstring_from_str(bs
->backing_file
));
1673 qdict_put_obj(bs_dict
, "inserted", obj
);
1675 qlist_append_obj(bs_list
, bs_obj
);
1678 *ret_data
= QOBJECT(bs_list
);
1681 static void bdrv_stats_iter(QObject
*data
, void *opaque
)
1684 Monitor
*mon
= opaque
;
1686 qdict
= qobject_to_qdict(data
);
1687 monitor_printf(mon
, "%s:", qdict_get_str(qdict
, "device"));
1689 qdict
= qobject_to_qdict(qdict_get(qdict
, "stats"));
1690 monitor_printf(mon
, " rd_bytes=%" PRId64
1691 " wr_bytes=%" PRId64
1692 " rd_operations=%" PRId64
1693 " wr_operations=%" PRId64
1695 qdict_get_int(qdict
, "rd_bytes"),
1696 qdict_get_int(qdict
, "wr_bytes"),
1697 qdict_get_int(qdict
, "rd_operations"),
1698 qdict_get_int(qdict
, "wr_operations"));
1701 void bdrv_stats_print(Monitor
*mon
, const QObject
*data
)
1703 qlist_iter(qobject_to_qlist(data
), bdrv_stats_iter
, mon
);
1706 static QObject
* bdrv_info_stats_bs(BlockDriverState
*bs
)
1711 res
= qobject_from_jsonf("{ 'stats': {"
1712 "'rd_bytes': %" PRId64
","
1713 "'wr_bytes': %" PRId64
","
1714 "'rd_operations': %" PRId64
","
1715 "'wr_operations': %" PRId64
","
1716 "'wr_highest_offset': %" PRId64
1718 bs
->rd_bytes
, bs
->wr_bytes
,
1719 bs
->rd_ops
, bs
->wr_ops
,
1720 bs
->wr_highest_sector
*
1721 (uint64_t)BDRV_SECTOR_SIZE
);
1722 dict
= qobject_to_qdict(res
);
1724 if (*bs
->device_name
) {
1725 qdict_put(dict
, "device", qstring_from_str(bs
->device_name
));
1729 QObject
*parent
= bdrv_info_stats_bs(bs
->file
);
1730 qdict_put_obj(dict
, "parent", parent
);
1736 void bdrv_info_stats(Monitor
*mon
, QObject
**ret_data
)
1740 BlockDriverState
*bs
;
1742 devices
= qlist_new();
1744 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1745 obj
= bdrv_info_stats_bs(bs
);
1746 qlist_append_obj(devices
, obj
);
1749 *ret_data
= QOBJECT(devices
);
1752 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
)
1754 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
1755 return bs
->backing_file
;
1756 else if (bs
->encrypted
)
1757 return bs
->filename
;
1762 void bdrv_get_backing_filename(BlockDriverState
*bs
,
1763 char *filename
, int filename_size
)
1765 if (!bs
->backing_file
) {
1766 pstrcpy(filename
, filename_size
, "");
1768 pstrcpy(filename
, filename_size
, bs
->backing_file
);
1772 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
1773 const uint8_t *buf
, int nb_sectors
)
1775 BlockDriver
*drv
= bs
->drv
;
1778 if (!drv
->bdrv_write_compressed
)
1780 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
1783 if (bs
->dirty_bitmap
) {
1784 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
1787 return drv
->bdrv_write_compressed(bs
, sector_num
, buf
, nb_sectors
);
1790 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
1792 BlockDriver
*drv
= bs
->drv
;
1795 if (!drv
->bdrv_get_info
)
1797 memset(bdi
, 0, sizeof(*bdi
));
1798 return drv
->bdrv_get_info(bs
, bdi
);
1801 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
1802 int64_t pos
, int size
)
1804 BlockDriver
*drv
= bs
->drv
;
1807 if (drv
->bdrv_save_vmstate
)
1808 return drv
->bdrv_save_vmstate(bs
, buf
, pos
, size
);
1810 return bdrv_save_vmstate(bs
->file
, buf
, pos
, size
);
1814 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
1815 int64_t pos
, int size
)
1817 BlockDriver
*drv
= bs
->drv
;
1820 if (drv
->bdrv_load_vmstate
)
1821 return drv
->bdrv_load_vmstate(bs
, buf
, pos
, size
);
1823 return bdrv_load_vmstate(bs
->file
, buf
, pos
, size
);
1827 void bdrv_debug_event(BlockDriverState
*bs
, BlkDebugEvent event
)
1829 BlockDriver
*drv
= bs
->drv
;
1831 if (!drv
|| !drv
->bdrv_debug_event
) {
1835 return drv
->bdrv_debug_event(bs
, event
);
1839 /**************************************************************/
1840 /* handling of snapshots */
1842 int bdrv_can_snapshot(BlockDriverState
*bs
)
1844 BlockDriver
*drv
= bs
->drv
;
1845 if (!drv
|| bdrv_is_removable(bs
) || bdrv_is_read_only(bs
)) {
1849 if (!drv
->bdrv_snapshot_create
) {
1850 if (bs
->file
!= NULL
) {
1851 return bdrv_can_snapshot(bs
->file
);
1859 int bdrv_is_snapshot(BlockDriverState
*bs
)
1861 return !!(bs
->open_flags
& BDRV_O_SNAPSHOT
);
1864 BlockDriverState
*bdrv_snapshots(void)
1866 BlockDriverState
*bs
;
1869 return bs_snapshots
;
1873 while ((bs
= bdrv_next(bs
))) {
1874 if (bdrv_can_snapshot(bs
)) {
1882 int bdrv_snapshot_create(BlockDriverState
*bs
,
1883 QEMUSnapshotInfo
*sn_info
)
1885 BlockDriver
*drv
= bs
->drv
;
1888 if (drv
->bdrv_snapshot_create
)
1889 return drv
->bdrv_snapshot_create(bs
, sn_info
);
1891 return bdrv_snapshot_create(bs
->file
, sn_info
);
1895 int bdrv_snapshot_goto(BlockDriverState
*bs
,
1896 const char *snapshot_id
)
1898 BlockDriver
*drv
= bs
->drv
;
1903 if (drv
->bdrv_snapshot_goto
)
1904 return drv
->bdrv_snapshot_goto(bs
, snapshot_id
);
1907 drv
->bdrv_close(bs
);
1908 ret
= bdrv_snapshot_goto(bs
->file
, snapshot_id
);
1909 open_ret
= drv
->bdrv_open(bs
, bs
->open_flags
);
1911 bdrv_delete(bs
->file
);
1921 int bdrv_snapshot_delete(BlockDriverState
*bs
, const char *snapshot_id
)
1923 BlockDriver
*drv
= bs
->drv
;
1926 if (drv
->bdrv_snapshot_delete
)
1927 return drv
->bdrv_snapshot_delete(bs
, snapshot_id
);
1929 return bdrv_snapshot_delete(bs
->file
, snapshot_id
);
1933 int bdrv_snapshot_list(BlockDriverState
*bs
,
1934 QEMUSnapshotInfo
**psn_info
)
1936 BlockDriver
*drv
= bs
->drv
;
1939 if (drv
->bdrv_snapshot_list
)
1940 return drv
->bdrv_snapshot_list(bs
, psn_info
);
1942 return bdrv_snapshot_list(bs
->file
, psn_info
);
1946 int bdrv_snapshot_load_tmp(BlockDriverState
*bs
,
1947 const char *snapshot_name
)
1949 BlockDriver
*drv
= bs
->drv
;
1953 if (!bs
->read_only
) {
1956 if (drv
->bdrv_snapshot_load_tmp
) {
1957 return drv
->bdrv_snapshot_load_tmp(bs
, snapshot_name
);
1962 #define NB_SUFFIXES 4
1964 char *get_human_readable_size(char *buf
, int buf_size
, int64_t size
)
1966 static const char suffixes
[NB_SUFFIXES
] = "KMGT";
1971 snprintf(buf
, buf_size
, "%" PRId64
, size
);
1974 for(i
= 0; i
< NB_SUFFIXES
; i
++) {
1975 if (size
< (10 * base
)) {
1976 snprintf(buf
, buf_size
, "%0.1f%c",
1977 (double)size
/ base
,
1980 } else if (size
< (1000 * base
) || i
== (NB_SUFFIXES
- 1)) {
1981 snprintf(buf
, buf_size
, "%" PRId64
"%c",
1982 ((size
+ (base
>> 1)) / base
),
1992 char *bdrv_snapshot_dump(char *buf
, int buf_size
, QEMUSnapshotInfo
*sn
)
1994 char buf1
[128], date_buf
[128], clock_buf
[128];
2004 snprintf(buf
, buf_size
,
2005 "%-10s%-20s%7s%20s%15s",
2006 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2010 ptm
= localtime(&ti
);
2011 strftime(date_buf
, sizeof(date_buf
),
2012 "%Y-%m-%d %H:%M:%S", ptm
);
2014 localtime_r(&ti
, &tm
);
2015 strftime(date_buf
, sizeof(date_buf
),
2016 "%Y-%m-%d %H:%M:%S", &tm
);
2018 secs
= sn
->vm_clock_nsec
/ 1000000000;
2019 snprintf(clock_buf
, sizeof(clock_buf
),
2020 "%02d:%02d:%02d.%03d",
2022 (int)((secs
/ 60) % 60),
2024 (int)((sn
->vm_clock_nsec
/ 1000000) % 1000));
2025 snprintf(buf
, buf_size
,
2026 "%-10s%-20s%7s%20s%15s",
2027 sn
->id_str
, sn
->name
,
2028 get_human_readable_size(buf1
, sizeof(buf1
), sn
->vm_state_size
),
2036 /**************************************************************/
2039 BlockDriverAIOCB
*bdrv_aio_readv(BlockDriverState
*bs
, int64_t sector_num
,
2040 QEMUIOVector
*qiov
, int nb_sectors
,
2041 BlockDriverCompletionFunc
*cb
, void *opaque
)
2043 BlockDriver
*drv
= bs
->drv
;
2044 BlockDriverAIOCB
*ret
;
2046 trace_bdrv_aio_readv(bs
, sector_num
, nb_sectors
, opaque
);
2050 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
2053 ret
= drv
->bdrv_aio_readv(bs
, sector_num
, qiov
, nb_sectors
,
2057 /* Update stats even though technically transfer has not happened. */
2058 bs
->rd_bytes
+= (unsigned) nb_sectors
* BDRV_SECTOR_SIZE
;
2065 typedef struct BlockCompleteData
{
2066 BlockDriverCompletionFunc
*cb
;
2068 BlockDriverState
*bs
;
2071 } BlockCompleteData
;
2073 static void block_complete_cb(void *opaque
, int ret
)
2075 BlockCompleteData
*b
= opaque
;
2077 if (b
->bs
->dirty_bitmap
) {
2078 set_dirty_bitmap(b
->bs
, b
->sector_num
, b
->nb_sectors
, 1);
2080 b
->cb(b
->opaque
, ret
);
2084 static BlockCompleteData
*blk_dirty_cb_alloc(BlockDriverState
*bs
,
2087 BlockDriverCompletionFunc
*cb
,
2090 BlockCompleteData
*blkdata
= qemu_mallocz(sizeof(BlockCompleteData
));
2094 blkdata
->opaque
= opaque
;
2095 blkdata
->sector_num
= sector_num
;
2096 blkdata
->nb_sectors
= nb_sectors
;
2101 BlockDriverAIOCB
*bdrv_aio_writev(BlockDriverState
*bs
, int64_t sector_num
,
2102 QEMUIOVector
*qiov
, int nb_sectors
,
2103 BlockDriverCompletionFunc
*cb
, void *opaque
)
2105 BlockDriver
*drv
= bs
->drv
;
2106 BlockDriverAIOCB
*ret
;
2107 BlockCompleteData
*blk_cb_data
;
2109 trace_bdrv_aio_writev(bs
, sector_num
, nb_sectors
, opaque
);
2115 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
2118 if (bs
->dirty_bitmap
) {
2119 blk_cb_data
= blk_dirty_cb_alloc(bs
, sector_num
, nb_sectors
, cb
,
2121 cb
= &block_complete_cb
;
2122 opaque
= blk_cb_data
;
2125 ret
= drv
->bdrv_aio_writev(bs
, sector_num
, qiov
, nb_sectors
,
2129 /* Update stats even though technically transfer has not happened. */
2130 bs
->wr_bytes
+= (unsigned) nb_sectors
* BDRV_SECTOR_SIZE
;
2132 if (bs
->wr_highest_sector
< sector_num
+ nb_sectors
- 1) {
2133 bs
->wr_highest_sector
= sector_num
+ nb_sectors
- 1;
2141 typedef struct MultiwriteCB
{
2146 BlockDriverCompletionFunc
*cb
;
2148 QEMUIOVector
*free_qiov
;
2153 static void multiwrite_user_cb(MultiwriteCB
*mcb
)
2157 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2158 mcb
->callbacks
[i
].cb(mcb
->callbacks
[i
].opaque
, mcb
->error
);
2159 if (mcb
->callbacks
[i
].free_qiov
) {
2160 qemu_iovec_destroy(mcb
->callbacks
[i
].free_qiov
);
2162 qemu_free(mcb
->callbacks
[i
].free_qiov
);
2163 qemu_vfree(mcb
->callbacks
[i
].free_buf
);
2167 static void multiwrite_cb(void *opaque
, int ret
)
2169 MultiwriteCB
*mcb
= opaque
;
2171 trace_multiwrite_cb(mcb
, ret
);
2173 if (ret
< 0 && !mcb
->error
) {
2177 mcb
->num_requests
--;
2178 if (mcb
->num_requests
== 0) {
2179 multiwrite_user_cb(mcb
);
2184 static int multiwrite_req_compare(const void *a
, const void *b
)
2186 const BlockRequest
*req1
= a
, *req2
= b
;
2189 * Note that we can't simply subtract req2->sector from req1->sector
2190 * here as that could overflow the return value.
2192 if (req1
->sector
> req2
->sector
) {
2194 } else if (req1
->sector
< req2
->sector
) {
2202 * Takes a bunch of requests and tries to merge them. Returns the number of
2203 * requests that remain after merging.
2205 static int multiwrite_merge(BlockDriverState
*bs
, BlockRequest
*reqs
,
2206 int num_reqs
, MultiwriteCB
*mcb
)
2210 // Sort requests by start sector
2211 qsort(reqs
, num_reqs
, sizeof(*reqs
), &multiwrite_req_compare
);
2213 // Check if adjacent requests touch the same clusters. If so, combine them,
2214 // filling up gaps with zero sectors.
2216 for (i
= 1; i
< num_reqs
; i
++) {
2218 int64_t oldreq_last
= reqs
[outidx
].sector
+ reqs
[outidx
].nb_sectors
;
2220 // This handles the cases that are valid for all block drivers, namely
2221 // exactly sequential writes and overlapping writes.
2222 if (reqs
[i
].sector
<= oldreq_last
) {
2226 // The block driver may decide that it makes sense to combine requests
2227 // even if there is a gap of some sectors between them. In this case,
2228 // the gap is filled with zeros (therefore only applicable for yet
2229 // unused space in format like qcow2).
2230 if (!merge
&& bs
->drv
->bdrv_merge_requests
) {
2231 merge
= bs
->drv
->bdrv_merge_requests(bs
, &reqs
[outidx
], &reqs
[i
]);
2234 if (reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1 > IOV_MAX
) {
2240 QEMUIOVector
*qiov
= qemu_mallocz(sizeof(*qiov
));
2241 qemu_iovec_init(qiov
,
2242 reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1);
2244 // Add the first request to the merged one. If the requests are
2245 // overlapping, drop the last sectors of the first request.
2246 size
= (reqs
[i
].sector
- reqs
[outidx
].sector
) << 9;
2247 qemu_iovec_concat(qiov
, reqs
[outidx
].qiov
, size
);
2249 // We might need to add some zeros between the two requests
2250 if (reqs
[i
].sector
> oldreq_last
) {
2251 size_t zero_bytes
= (reqs
[i
].sector
- oldreq_last
) << 9;
2252 uint8_t *buf
= qemu_blockalign(bs
, zero_bytes
);
2253 memset(buf
, 0, zero_bytes
);
2254 qemu_iovec_add(qiov
, buf
, zero_bytes
);
2255 mcb
->callbacks
[i
].free_buf
= buf
;
2258 // Add the second request
2259 qemu_iovec_concat(qiov
, reqs
[i
].qiov
, reqs
[i
].qiov
->size
);
2261 reqs
[outidx
].nb_sectors
= qiov
->size
>> 9;
2262 reqs
[outidx
].qiov
= qiov
;
2264 mcb
->callbacks
[i
].free_qiov
= reqs
[outidx
].qiov
;
2267 reqs
[outidx
].sector
= reqs
[i
].sector
;
2268 reqs
[outidx
].nb_sectors
= reqs
[i
].nb_sectors
;
2269 reqs
[outidx
].qiov
= reqs
[i
].qiov
;
2277 * Submit multiple AIO write requests at once.
2279 * On success, the function returns 0 and all requests in the reqs array have
2280 * been submitted. In error case this function returns -1, and any of the
2281 * requests may or may not be submitted yet. In particular, this means that the
2282 * callback will be called for some of the requests, for others it won't. The
2283 * caller must check the error field of the BlockRequest to wait for the right
2284 * callbacks (if error != 0, no callback will be called).
2286 * The implementation may modify the contents of the reqs array, e.g. to merge
2287 * requests. However, the fields opaque and error are left unmodified as they
2288 * are used to signal failure for a single request to the caller.
2290 int bdrv_aio_multiwrite(BlockDriverState
*bs
, BlockRequest
*reqs
, int num_reqs
)
2292 BlockDriverAIOCB
*acb
;
2296 if (num_reqs
== 0) {
2300 // Create MultiwriteCB structure
2301 mcb
= qemu_mallocz(sizeof(*mcb
) + num_reqs
* sizeof(*mcb
->callbacks
));
2302 mcb
->num_requests
= 0;
2303 mcb
->num_callbacks
= num_reqs
;
2305 for (i
= 0; i
< num_reqs
; i
++) {
2306 mcb
->callbacks
[i
].cb
= reqs
[i
].cb
;
2307 mcb
->callbacks
[i
].opaque
= reqs
[i
].opaque
;
2310 // Check for mergable requests
2311 num_reqs
= multiwrite_merge(bs
, reqs
, num_reqs
, mcb
);
2313 trace_bdrv_aio_multiwrite(mcb
, mcb
->num_callbacks
, num_reqs
);
2316 * Run the aio requests. As soon as one request can't be submitted
2317 * successfully, fail all requests that are not yet submitted (we must
2318 * return failure for all requests anyway)
2320 * num_requests cannot be set to the right value immediately: If
2321 * bdrv_aio_writev fails for some request, num_requests would be too high
2322 * and therefore multiwrite_cb() would never recognize the multiwrite
2323 * request as completed. We also cannot use the loop variable i to set it
2324 * when the first request fails because the callback may already have been
2325 * called for previously submitted requests. Thus, num_requests must be
2326 * incremented for each request that is submitted.
2328 * The problem that callbacks may be called early also means that we need
2329 * to take care that num_requests doesn't become 0 before all requests are
2330 * submitted - multiwrite_cb() would consider the multiwrite request
2331 * completed. A dummy request that is "completed" by a manual call to
2332 * multiwrite_cb() takes care of this.
2334 mcb
->num_requests
= 1;
2336 // Run the aio requests
2337 for (i
= 0; i
< num_reqs
; i
++) {
2338 mcb
->num_requests
++;
2339 acb
= bdrv_aio_writev(bs
, reqs
[i
].sector
, reqs
[i
].qiov
,
2340 reqs
[i
].nb_sectors
, multiwrite_cb
, mcb
);
2343 // We can only fail the whole thing if no request has been
2344 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2345 // complete and report the error in the callback.
2347 trace_bdrv_aio_multiwrite_earlyfail(mcb
);
2350 trace_bdrv_aio_multiwrite_latefail(mcb
, i
);
2351 multiwrite_cb(mcb
, -EIO
);
2357 /* Complete the dummy request */
2358 multiwrite_cb(mcb
, 0);
2363 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2364 reqs
[i
].error
= -EIO
;
2370 BlockDriverAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
2371 BlockDriverCompletionFunc
*cb
, void *opaque
)
2373 BlockDriver
*drv
= bs
->drv
;
2375 if (bs
->open_flags
& BDRV_O_NO_FLUSH
) {
2376 return bdrv_aio_noop_em(bs
, cb
, opaque
);
2381 return drv
->bdrv_aio_flush(bs
, cb
, opaque
);
2384 void bdrv_aio_cancel(BlockDriverAIOCB
*acb
)
2386 acb
->pool
->cancel(acb
);
2390 /**************************************************************/
2391 /* async block device emulation */
2393 typedef struct BlockDriverAIOCBSync
{
2394 BlockDriverAIOCB common
;
2397 /* vector translation state */
2401 } BlockDriverAIOCBSync
;
2403 static void bdrv_aio_cancel_em(BlockDriverAIOCB
*blockacb
)
2405 BlockDriverAIOCBSync
*acb
=
2406 container_of(blockacb
, BlockDriverAIOCBSync
, common
);
2407 qemu_bh_delete(acb
->bh
);
2409 qemu_aio_release(acb
);
2412 static AIOPool bdrv_em_aio_pool
= {
2413 .aiocb_size
= sizeof(BlockDriverAIOCBSync
),
2414 .cancel
= bdrv_aio_cancel_em
,
2417 static void bdrv_aio_bh_cb(void *opaque
)
2419 BlockDriverAIOCBSync
*acb
= opaque
;
2422 qemu_iovec_from_buffer(acb
->qiov
, acb
->bounce
, acb
->qiov
->size
);
2423 qemu_vfree(acb
->bounce
);
2424 acb
->common
.cb(acb
->common
.opaque
, acb
->ret
);
2425 qemu_bh_delete(acb
->bh
);
2427 qemu_aio_release(acb
);
2430 static BlockDriverAIOCB
*bdrv_aio_rw_vector(BlockDriverState
*bs
,
2434 BlockDriverCompletionFunc
*cb
,
2439 BlockDriverAIOCBSync
*acb
;
2441 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2442 acb
->is_write
= is_write
;
2444 acb
->bounce
= qemu_blockalign(bs
, qiov
->size
);
2447 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2450 qemu_iovec_to_buffer(acb
->qiov
, acb
->bounce
);
2451 acb
->ret
= bdrv_write(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2453 acb
->ret
= bdrv_read(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2456 qemu_bh_schedule(acb
->bh
);
2458 return &acb
->common
;
2461 static BlockDriverAIOCB
*bdrv_aio_readv_em(BlockDriverState
*bs
,
2462 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2463 BlockDriverCompletionFunc
*cb
, void *opaque
)
2465 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 0);
2468 static BlockDriverAIOCB
*bdrv_aio_writev_em(BlockDriverState
*bs
,
2469 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2470 BlockDriverCompletionFunc
*cb
, void *opaque
)
2472 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 1);
2475 static BlockDriverAIOCB
*bdrv_aio_flush_em(BlockDriverState
*bs
,
2476 BlockDriverCompletionFunc
*cb
, void *opaque
)
2478 BlockDriverAIOCBSync
*acb
;
2480 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2481 acb
->is_write
= 1; /* don't bounce in the completion hadler */
2487 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2490 qemu_bh_schedule(acb
->bh
);
2491 return &acb
->common
;
2494 static BlockDriverAIOCB
*bdrv_aio_noop_em(BlockDriverState
*bs
,
2495 BlockDriverCompletionFunc
*cb
, void *opaque
)
2497 BlockDriverAIOCBSync
*acb
;
2499 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2500 acb
->is_write
= 1; /* don't bounce in the completion handler */
2506 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2509 qemu_bh_schedule(acb
->bh
);
2510 return &acb
->common
;
2513 /**************************************************************/
2514 /* sync block device emulation */
2516 static void bdrv_rw_em_cb(void *opaque
, int ret
)
2518 *(int *)opaque
= ret
;
2521 #define NOT_DONE 0x7fffffff
2523 static int bdrv_read_em(BlockDriverState
*bs
, int64_t sector_num
,
2524 uint8_t *buf
, int nb_sectors
)
2527 BlockDriverAIOCB
*acb
;
2531 async_context_push();
2533 async_ret
= NOT_DONE
;
2534 iov
.iov_base
= (void *)buf
;
2535 iov
.iov_len
= nb_sectors
* BDRV_SECTOR_SIZE
;
2536 qemu_iovec_init_external(&qiov
, &iov
, 1);
2537 acb
= bdrv_aio_readv(bs
, sector_num
, &qiov
, nb_sectors
,
2538 bdrv_rw_em_cb
, &async_ret
);
2544 while (async_ret
== NOT_DONE
) {
2550 async_context_pop();
2554 static int bdrv_write_em(BlockDriverState
*bs
, int64_t sector_num
,
2555 const uint8_t *buf
, int nb_sectors
)
2558 BlockDriverAIOCB
*acb
;
2562 async_context_push();
2564 async_ret
= NOT_DONE
;
2565 iov
.iov_base
= (void *)buf
;
2566 iov
.iov_len
= nb_sectors
* BDRV_SECTOR_SIZE
;
2567 qemu_iovec_init_external(&qiov
, &iov
, 1);
2568 acb
= bdrv_aio_writev(bs
, sector_num
, &qiov
, nb_sectors
,
2569 bdrv_rw_em_cb
, &async_ret
);
2574 while (async_ret
== NOT_DONE
) {
2579 async_context_pop();
2583 void bdrv_init(void)
2585 module_call_init(MODULE_INIT_BLOCK
);
2588 void bdrv_init_with_whitelist(void)
2590 use_bdrv_whitelist
= 1;
2594 void *qemu_aio_get(AIOPool
*pool
, BlockDriverState
*bs
,
2595 BlockDriverCompletionFunc
*cb
, void *opaque
)
2597 BlockDriverAIOCB
*acb
;
2599 if (pool
->free_aiocb
) {
2600 acb
= pool
->free_aiocb
;
2601 pool
->free_aiocb
= acb
->next
;
2603 acb
= qemu_mallocz(pool
->aiocb_size
);
2608 acb
->opaque
= opaque
;
2612 void qemu_aio_release(void *p
)
2614 BlockDriverAIOCB
*acb
= (BlockDriverAIOCB
*)p
;
2615 AIOPool
*pool
= acb
->pool
;
2616 acb
->next
= pool
->free_aiocb
;
2617 pool
->free_aiocb
= acb
;
2620 /**************************************************************/
2621 /* removable device support */
2624 * Return TRUE if the media is present
2626 int bdrv_is_inserted(BlockDriverState
*bs
)
2628 BlockDriver
*drv
= bs
->drv
;
2632 if (!drv
->bdrv_is_inserted
)
2633 return !bs
->tray_open
;
2634 ret
= drv
->bdrv_is_inserted(bs
);
2639 * Return TRUE if the media changed since the last call to this
2640 * function. It is currently only used for floppy disks
2642 int bdrv_media_changed(BlockDriverState
*bs
)
2644 BlockDriver
*drv
= bs
->drv
;
2647 if (!drv
|| !drv
->bdrv_media_changed
)
2650 ret
= drv
->bdrv_media_changed(bs
);
2651 if (ret
== -ENOTSUP
)
2652 ret
= bs
->media_changed
;
2653 bs
->media_changed
= 0;
2658 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2660 int bdrv_eject(BlockDriverState
*bs
, int eject_flag
)
2662 BlockDriver
*drv
= bs
->drv
;
2669 if (!drv
|| !drv
->bdrv_eject
) {
2672 ret
= drv
->bdrv_eject(bs
, eject_flag
);
2674 if (ret
== -ENOTSUP
) {
2678 bs
->tray_open
= eject_flag
;
2684 int bdrv_is_locked(BlockDriverState
*bs
)
2690 * Lock or unlock the media (if it is locked, the user won't be able
2691 * to eject it manually).
2693 void bdrv_set_locked(BlockDriverState
*bs
, int locked
)
2695 BlockDriver
*drv
= bs
->drv
;
2697 bs
->locked
= locked
;
2698 if (drv
&& drv
->bdrv_set_locked
) {
2699 drv
->bdrv_set_locked(bs
, locked
);
2703 /* needed for generic scsi interface */
2705 int bdrv_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
2707 BlockDriver
*drv
= bs
->drv
;
2709 if (drv
&& drv
->bdrv_ioctl
)
2710 return drv
->bdrv_ioctl(bs
, req
, buf
);
2714 BlockDriverAIOCB
*bdrv_aio_ioctl(BlockDriverState
*bs
,
2715 unsigned long int req
, void *buf
,
2716 BlockDriverCompletionFunc
*cb
, void *opaque
)
2718 BlockDriver
*drv
= bs
->drv
;
2720 if (drv
&& drv
->bdrv_aio_ioctl
)
2721 return drv
->bdrv_aio_ioctl(bs
, req
, buf
, cb
, opaque
);
2727 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
)
2729 return qemu_memalign((bs
&& bs
->buffer_alignment
) ? bs
->buffer_alignment
: 512, size
);
2732 void bdrv_set_dirty_tracking(BlockDriverState
*bs
, int enable
)
2734 int64_t bitmap_size
;
2736 bs
->dirty_count
= 0;
2738 if (!bs
->dirty_bitmap
) {
2739 bitmap_size
= (bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
) +
2740 BDRV_SECTORS_PER_DIRTY_CHUNK
* 8 - 1;
2741 bitmap_size
/= BDRV_SECTORS_PER_DIRTY_CHUNK
* 8;
2743 bs
->dirty_bitmap
= qemu_mallocz(bitmap_size
);
2746 if (bs
->dirty_bitmap
) {
2747 qemu_free(bs
->dirty_bitmap
);
2748 bs
->dirty_bitmap
= NULL
;
2753 int bdrv_get_dirty(BlockDriverState
*bs
, int64_t sector
)
2755 int64_t chunk
= sector
/ (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK
;
2757 if (bs
->dirty_bitmap
&&
2758 (sector
<< BDRV_SECTOR_BITS
) < bdrv_getlength(bs
)) {
2759 return !!(bs
->dirty_bitmap
[chunk
/ (sizeof(unsigned long) * 8)] &
2760 (1UL << (chunk
% (sizeof(unsigned long) * 8))));
2766 void bdrv_reset_dirty(BlockDriverState
*bs
, int64_t cur_sector
,
2769 set_dirty_bitmap(bs
, cur_sector
, nr_sectors
, 0);
2772 int64_t bdrv_get_dirty_count(BlockDriverState
*bs
)
2774 return bs
->dirty_count
;
2777 void bdrv_set_in_use(BlockDriverState
*bs
, int in_use
)
2779 assert(bs
->in_use
!= in_use
);
2780 bs
->in_use
= in_use
;
2783 int bdrv_in_use(BlockDriverState
*bs
)
2788 int bdrv_img_create(const char *filename
, const char *fmt
,
2789 const char *base_filename
, const char *base_fmt
,
2790 char *options
, uint64_t img_size
, int flags
)
2792 QEMUOptionParameter
*param
= NULL
, *create_options
= NULL
;
2793 QEMUOptionParameter
*backing_fmt
, *backing_file
;
2794 BlockDriverState
*bs
= NULL
;
2795 BlockDriver
*drv
, *proto_drv
;
2796 BlockDriver
*backing_drv
= NULL
;
2799 /* Find driver and parse its options */
2800 drv
= bdrv_find_format(fmt
);
2802 error_report("Unknown file format '%s'", fmt
);
2807 proto_drv
= bdrv_find_protocol(filename
);
2809 error_report("Unknown protocol '%s'", filename
);
2814 create_options
= append_option_parameters(create_options
,
2815 drv
->create_options
);
2816 create_options
= append_option_parameters(create_options
,
2817 proto_drv
->create_options
);
2819 /* Create parameter list with default values */
2820 param
= parse_option_parameters("", create_options
, param
);
2822 set_option_parameter_int(param
, BLOCK_OPT_SIZE
, img_size
);
2824 /* Parse -o options */
2826 param
= parse_option_parameters(options
, create_options
, param
);
2827 if (param
== NULL
) {
2828 error_report("Invalid options for file format '%s'.", fmt
);
2834 if (base_filename
) {
2835 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FILE
,
2837 error_report("Backing file not supported for file format '%s'",
2845 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FMT
, base_fmt
)) {
2846 error_report("Backing file format not supported for file "
2847 "format '%s'", fmt
);
2853 backing_file
= get_option_parameter(param
, BLOCK_OPT_BACKING_FILE
);
2854 if (backing_file
&& backing_file
->value
.s
) {
2855 if (!strcmp(filename
, backing_file
->value
.s
)) {
2856 error_report("Error: Trying to create an image with the "
2857 "same filename as the backing file");
2863 backing_fmt
= get_option_parameter(param
, BLOCK_OPT_BACKING_FMT
);
2864 if (backing_fmt
&& backing_fmt
->value
.s
) {
2865 backing_drv
= bdrv_find_format(backing_fmt
->value
.s
);
2867 error_report("Unknown backing file format '%s'",
2868 backing_fmt
->value
.s
);
2874 // The size for the image must always be specified, with one exception:
2875 // If we are using a backing file, we can obtain the size from there
2876 if (get_option_parameter(param
, BLOCK_OPT_SIZE
)->value
.n
== -1) {
2877 if (backing_file
&& backing_file
->value
.s
) {
2883 ret
= bdrv_open(bs
, backing_file
->value
.s
, flags
, backing_drv
);
2885 error_report("Could not open '%s'", backing_file
->value
.s
);
2888 bdrv_get_geometry(bs
, &size
);
2891 snprintf(buf
, sizeof(buf
), "%" PRId64
, size
);
2892 set_option_parameter(param
, BLOCK_OPT_SIZE
, buf
);
2894 error_report("Image creation needs a size parameter");
2900 printf("Formatting '%s', fmt=%s ", filename
, fmt
);
2901 print_option_parameters(param
);
2904 ret
= bdrv_create(drv
, filename
, param
);
2907 if (ret
== -ENOTSUP
) {
2908 error_report("Formatting or formatting option not supported for "
2909 "file format '%s'", fmt
);
2910 } else if (ret
== -EFBIG
) {
2911 error_report("The image size is too large for file format '%s'",
2914 error_report("%s: error while creating %s: %s", filename
, fmt
,
2920 free_option_parameters(create_options
);
2921 free_option_parameters(param
);