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
);
442 if (flags
& BDRV_O_CACHE_WB
)
443 bs
->enable_write_cache
= 1;
446 * Clear flags that are internal to the block layer before opening the
449 open_flags
= flags
& ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
452 * Snapshots should be writable.
454 if (bs
->is_temporary
) {
455 open_flags
|= BDRV_O_RDWR
;
458 /* Open the image, either directly or using a protocol */
459 if (drv
->bdrv_file_open
) {
460 ret
= drv
->bdrv_file_open(bs
, filename
, open_flags
);
462 ret
= bdrv_file_open(&bs
->file
, filename
, open_flags
);
464 ret
= drv
->bdrv_open(bs
, open_flags
);
472 bs
->keep_read_only
= bs
->read_only
= !(open_flags
& BDRV_O_RDWR
);
474 ret
= refresh_total_sectors(bs
, bs
->total_sectors
);
480 if (bs
->is_temporary
) {
488 bdrv_delete(bs
->file
);
491 qemu_free(bs
->opaque
);
498 * Opens a file using a protocol (file, host_device, nbd, ...)
500 int bdrv_file_open(BlockDriverState
**pbs
, const char *filename
, int flags
)
502 BlockDriverState
*bs
;
506 drv
= bdrv_find_protocol(filename
);
512 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
523 * Opens a disk image (raw, qcow2, vmdk, ...)
525 int bdrv_open(BlockDriverState
*bs
, const char *filename
, int flags
,
530 if (flags
& BDRV_O_SNAPSHOT
) {
531 BlockDriverState
*bs1
;
534 BlockDriver
*bdrv_qcow2
;
535 QEMUOptionParameter
*options
;
536 char tmp_filename
[PATH_MAX
];
537 char backing_filename
[PATH_MAX
];
539 /* if snapshot, we create a temporary backing file and open it
540 instead of opening 'filename' directly */
542 /* if there is a backing file, use it */
544 ret
= bdrv_open(bs1
, filename
, 0, drv
);
549 total_size
= bdrv_getlength(bs1
) & BDRV_SECTOR_MASK
;
551 if (bs1
->drv
&& bs1
->drv
->protocol_name
)
556 get_tmp_filename(tmp_filename
, sizeof(tmp_filename
));
558 /* Real path is meaningless for protocols */
560 snprintf(backing_filename
, sizeof(backing_filename
),
562 else if (!realpath(filename
, backing_filename
))
565 bdrv_qcow2
= bdrv_find_format("qcow2");
566 options
= parse_option_parameters("", bdrv_qcow2
->create_options
, NULL
);
568 set_option_parameter_int(options
, BLOCK_OPT_SIZE
, total_size
);
569 set_option_parameter(options
, BLOCK_OPT_BACKING_FILE
, backing_filename
);
571 set_option_parameter(options
, BLOCK_OPT_BACKING_FMT
,
575 ret
= bdrv_create(bdrv_qcow2
, tmp_filename
, options
);
576 free_option_parameters(options
);
581 filename
= tmp_filename
;
583 bs
->is_temporary
= 1;
586 /* Find the right image format driver */
588 ret
= find_image_format(filename
, &drv
);
592 goto unlink_and_fail
;
596 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
598 goto unlink_and_fail
;
601 /* If there is a backing file, use it */
602 if ((flags
& BDRV_O_NO_BACKING
) == 0 && bs
->backing_file
[0] != '\0') {
603 char backing_filename
[PATH_MAX
];
605 BlockDriver
*back_drv
= NULL
;
607 bs
->backing_hd
= bdrv_new("");
609 if (path_has_protocol(bs
->backing_file
)) {
610 pstrcpy(backing_filename
, sizeof(backing_filename
),
613 path_combine(backing_filename
, sizeof(backing_filename
),
614 filename
, bs
->backing_file
);
617 if (bs
->backing_format
[0] != '\0') {
618 back_drv
= bdrv_find_format(bs
->backing_format
);
621 /* backing files always opened read-only */
623 flags
& ~(BDRV_O_RDWR
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
625 ret
= bdrv_open(bs
->backing_hd
, backing_filename
, back_flags
, back_drv
);
630 if (bs
->is_temporary
) {
631 bs
->backing_hd
->keep_read_only
= !(flags
& BDRV_O_RDWR
);
633 /* base image inherits from "parent" */
634 bs
->backing_hd
->keep_read_only
= bs
->keep_read_only
;
638 if (!bdrv_key_required(bs
)) {
639 /* call the change callback */
640 bs
->media_changed
= 1;
642 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
648 if (bs
->is_temporary
) {
654 void bdrv_close(BlockDriverState
*bs
)
657 if (bs
== bs_snapshots
) {
660 if (bs
->backing_hd
) {
661 bdrv_delete(bs
->backing_hd
);
662 bs
->backing_hd
= NULL
;
664 bs
->drv
->bdrv_close(bs
);
665 qemu_free(bs
->opaque
);
667 if (bs
->is_temporary
) {
668 unlink(bs
->filename
);
674 if (bs
->file
!= NULL
) {
675 bdrv_close(bs
->file
);
678 /* call the change callback */
679 bs
->media_changed
= 1;
681 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
685 void bdrv_close_all(void)
687 BlockDriverState
*bs
;
689 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
694 /* make a BlockDriverState anonymous by removing from bdrv_state list.
695 Also, NULL terminate the device_name to prevent double remove */
696 void bdrv_make_anon(BlockDriverState
*bs
)
698 if (bs
->device_name
[0] != '\0') {
699 QTAILQ_REMOVE(&bdrv_states
, bs
, list
);
701 bs
->device_name
[0] = '\0';
704 void bdrv_delete(BlockDriverState
*bs
)
708 /* remove from list, if necessary */
712 if (bs
->file
!= NULL
) {
713 bdrv_delete(bs
->file
);
716 assert(bs
!= bs_snapshots
);
720 int bdrv_attach(BlockDriverState
*bs
, DeviceState
*qdev
)
729 void bdrv_detach(BlockDriverState
*bs
, DeviceState
*qdev
)
731 assert(bs
->peer
== qdev
);
735 DeviceState
*bdrv_get_attached(BlockDriverState
*bs
)
741 * Run consistency checks on an image
743 * Returns 0 if the check could be completed (it doesn't mean that the image is
744 * free of errors) or -errno when an internal error occurred. The results of the
745 * check are stored in res.
747 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
)
749 if (bs
->drv
->bdrv_check
== NULL
) {
753 memset(res
, 0, sizeof(*res
));
754 return bs
->drv
->bdrv_check(bs
, res
);
757 #define COMMIT_BUF_SECTORS 2048
759 /* commit COW file into the raw image */
760 int bdrv_commit(BlockDriverState
*bs
)
762 BlockDriver
*drv
= bs
->drv
;
763 BlockDriver
*backing_drv
;
764 int64_t sector
, total_sectors
;
765 int n
, ro
, open_flags
;
766 int ret
= 0, rw_ret
= 0;
769 BlockDriverState
*bs_rw
, *bs_ro
;
774 if (!bs
->backing_hd
) {
778 if (bs
->backing_hd
->keep_read_only
) {
782 backing_drv
= bs
->backing_hd
->drv
;
783 ro
= bs
->backing_hd
->read_only
;
784 strncpy(filename
, bs
->backing_hd
->filename
, sizeof(filename
));
785 open_flags
= bs
->backing_hd
->open_flags
;
789 bdrv_delete(bs
->backing_hd
);
790 bs
->backing_hd
= NULL
;
791 bs_rw
= bdrv_new("");
792 rw_ret
= bdrv_open(bs_rw
, filename
, open_flags
| BDRV_O_RDWR
,
796 /* try to re-open read-only */
797 bs_ro
= bdrv_new("");
798 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
802 /* drive not functional anymore */
806 bs
->backing_hd
= bs_ro
;
809 bs
->backing_hd
= bs_rw
;
812 total_sectors
= bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
;
813 buf
= qemu_malloc(COMMIT_BUF_SECTORS
* BDRV_SECTOR_SIZE
);
815 for (sector
= 0; sector
< total_sectors
; sector
+= n
) {
816 if (drv
->bdrv_is_allocated(bs
, sector
, COMMIT_BUF_SECTORS
, &n
)) {
818 if (bdrv_read(bs
, sector
, buf
, n
) != 0) {
823 if (bdrv_write(bs
->backing_hd
, sector
, buf
, n
) != 0) {
830 if (drv
->bdrv_make_empty
) {
831 ret
= drv
->bdrv_make_empty(bs
);
836 * Make sure all data we wrote to the backing device is actually
840 bdrv_flush(bs
->backing_hd
);
847 bdrv_delete(bs
->backing_hd
);
848 bs
->backing_hd
= NULL
;
849 bs_ro
= bdrv_new("");
850 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
854 /* drive not functional anymore */
858 bs
->backing_hd
= bs_ro
;
859 bs
->backing_hd
->keep_read_only
= 0;
865 void bdrv_commit_all(void)
867 BlockDriverState
*bs
;
869 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
877 * -EINVAL - backing format specified, but no file
878 * -ENOSPC - can't update the backing file because no space is left in the
880 * -ENOTSUP - format driver doesn't support changing the backing file
882 int bdrv_change_backing_file(BlockDriverState
*bs
,
883 const char *backing_file
, const char *backing_fmt
)
885 BlockDriver
*drv
= bs
->drv
;
887 if (drv
->bdrv_change_backing_file
!= NULL
) {
888 return drv
->bdrv_change_backing_file(bs
, backing_file
, backing_fmt
);
894 static int bdrv_check_byte_request(BlockDriverState
*bs
, int64_t offset
,
899 if (!bdrv_is_inserted(bs
))
905 len
= bdrv_getlength(bs
);
910 if ((offset
> len
) || (len
- offset
< size
))
916 static int bdrv_check_request(BlockDriverState
*bs
, int64_t sector_num
,
919 return bdrv_check_byte_request(bs
, sector_num
* BDRV_SECTOR_SIZE
,
920 nb_sectors
* BDRV_SECTOR_SIZE
);
923 /* return < 0 if error. See bdrv_write() for the return codes */
924 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
925 uint8_t *buf
, int nb_sectors
)
927 BlockDriver
*drv
= bs
->drv
;
931 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
934 return drv
->bdrv_read(bs
, sector_num
, buf
, nb_sectors
);
937 static void set_dirty_bitmap(BlockDriverState
*bs
, int64_t sector_num
,
938 int nb_sectors
, int dirty
)
941 unsigned long val
, idx
, bit
;
943 start
= sector_num
/ BDRV_SECTORS_PER_DIRTY_CHUNK
;
944 end
= (sector_num
+ nb_sectors
- 1) / BDRV_SECTORS_PER_DIRTY_CHUNK
;
946 for (; start
<= end
; start
++) {
947 idx
= start
/ (sizeof(unsigned long) * 8);
948 bit
= start
% (sizeof(unsigned long) * 8);
949 val
= bs
->dirty_bitmap
[idx
];
951 if (!(val
& (1UL << bit
))) {
956 if (val
& (1UL << bit
)) {
958 val
&= ~(1UL << bit
);
961 bs
->dirty_bitmap
[idx
] = val
;
965 /* Return < 0 if error. Important errors are:
966 -EIO generic I/O error (may happen for all errors)
967 -ENOMEDIUM No media inserted.
968 -EINVAL Invalid sector number or nb_sectors
969 -EACCES Trying to write a read-only device
971 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
972 const uint8_t *buf
, int nb_sectors
)
974 BlockDriver
*drv
= bs
->drv
;
979 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
982 if (bs
->dirty_bitmap
) {
983 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
986 if (bs
->wr_highest_sector
< sector_num
+ nb_sectors
- 1) {
987 bs
->wr_highest_sector
= sector_num
+ nb_sectors
- 1;
990 return drv
->bdrv_write(bs
, sector_num
, buf
, nb_sectors
);
993 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
994 void *buf
, int count1
)
996 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
997 int len
, nb_sectors
, count
;
1002 /* first read to align to sector start */
1003 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1006 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1008 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1010 memcpy(buf
, tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), len
);
1018 /* read the sectors "in place" */
1019 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1020 if (nb_sectors
> 0) {
1021 if ((ret
= bdrv_read(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1023 sector_num
+= nb_sectors
;
1024 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1029 /* add data from the last sector */
1031 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1033 memcpy(buf
, tmp_buf
, count
);
1038 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
1039 const void *buf
, int count1
)
1041 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
1042 int len
, nb_sectors
, count
;
1047 /* first write to align to sector start */
1048 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1051 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1053 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1055 memcpy(tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), buf
, len
);
1056 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1065 /* write the sectors "in place" */
1066 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1067 if (nb_sectors
> 0) {
1068 if ((ret
= bdrv_write(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1070 sector_num
+= nb_sectors
;
1071 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1076 /* add data from the last sector */
1078 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1080 memcpy(tmp_buf
, buf
, count
);
1081 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1088 * Writes to the file and ensures that no writes are reordered across this
1089 * request (acts as a barrier)
1091 * Returns 0 on success, -errno in error cases.
1093 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
1094 const void *buf
, int count
)
1098 ret
= bdrv_pwrite(bs
, offset
, buf
, count
);
1103 /* No flush needed for cache=writethrough, it uses O_DSYNC */
1104 if ((bs
->open_flags
& BDRV_O_CACHE_MASK
) != 0) {
1112 * Writes to the file and ensures that no writes are reordered across this
1113 * request (acts as a barrier)
1115 * Returns 0 on success, -errno in error cases.
1117 int bdrv_write_sync(BlockDriverState
*bs
, int64_t sector_num
,
1118 const uint8_t *buf
, int nb_sectors
)
1120 return bdrv_pwrite_sync(bs
, BDRV_SECTOR_SIZE
* sector_num
,
1121 buf
, BDRV_SECTOR_SIZE
* nb_sectors
);
1125 * Truncate file to 'offset' bytes (needed only for file protocols)
1127 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
)
1129 BlockDriver
*drv
= bs
->drv
;
1133 if (!drv
->bdrv_truncate
)
1137 if (bdrv_in_use(bs
))
1139 ret
= drv
->bdrv_truncate(bs
, offset
);
1141 ret
= refresh_total_sectors(bs
, offset
>> BDRV_SECTOR_BITS
);
1142 if (bs
->change_cb
) {
1143 bs
->change_cb(bs
->change_opaque
, CHANGE_SIZE
);
1150 * Length of a allocated file in bytes. Sparse files are counted by actual
1151 * allocated space. Return < 0 if error or unknown.
1153 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
)
1155 BlockDriver
*drv
= bs
->drv
;
1159 if (drv
->bdrv_get_allocated_file_size
) {
1160 return drv
->bdrv_get_allocated_file_size(bs
);
1163 return bdrv_get_allocated_file_size(bs
->file
);
1169 * Length of a file in bytes. Return < 0 if error or unknown.
1171 int64_t bdrv_getlength(BlockDriverState
*bs
)
1173 BlockDriver
*drv
= bs
->drv
;
1177 if (bs
->growable
|| bs
->removable
) {
1178 if (drv
->bdrv_getlength
) {
1179 return drv
->bdrv_getlength(bs
);
1182 return bs
->total_sectors
* BDRV_SECTOR_SIZE
;
1185 /* return 0 as number of sectors if no device present or error */
1186 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
)
1189 length
= bdrv_getlength(bs
);
1193 length
= length
>> BDRV_SECTOR_BITS
;
1194 *nb_sectors_ptr
= length
;
1198 uint8_t boot_ind
; /* 0x80 - active */
1199 uint8_t head
; /* starting head */
1200 uint8_t sector
; /* starting sector */
1201 uint8_t cyl
; /* starting cylinder */
1202 uint8_t sys_ind
; /* What partition type */
1203 uint8_t end_head
; /* end head */
1204 uint8_t end_sector
; /* end sector */
1205 uint8_t end_cyl
; /* end cylinder */
1206 uint32_t start_sect
; /* starting sector counting from 0 */
1207 uint32_t nr_sects
; /* nr of sectors in partition */
1208 } __attribute__((packed
));
1210 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1211 static int guess_disk_lchs(BlockDriverState
*bs
,
1212 int *pcylinders
, int *pheads
, int *psectors
)
1214 uint8_t buf
[BDRV_SECTOR_SIZE
];
1215 int ret
, i
, heads
, sectors
, cylinders
;
1216 struct partition
*p
;
1218 uint64_t nb_sectors
;
1220 bdrv_get_geometry(bs
, &nb_sectors
);
1222 ret
= bdrv_read(bs
, 0, buf
, 1);
1225 /* test msdos magic */
1226 if (buf
[510] != 0x55 || buf
[511] != 0xaa)
1228 for(i
= 0; i
< 4; i
++) {
1229 p
= ((struct partition
*)(buf
+ 0x1be)) + i
;
1230 nr_sects
= le32_to_cpu(p
->nr_sects
);
1231 if (nr_sects
&& p
->end_head
) {
1232 /* We make the assumption that the partition terminates on
1233 a cylinder boundary */
1234 heads
= p
->end_head
+ 1;
1235 sectors
= p
->end_sector
& 63;
1238 cylinders
= nb_sectors
/ (heads
* sectors
);
1239 if (cylinders
< 1 || cylinders
> 16383)
1242 *psectors
= sectors
;
1243 *pcylinders
= cylinders
;
1245 printf("guessed geometry: LCHS=%d %d %d\n",
1246 cylinders
, heads
, sectors
);
1254 void bdrv_guess_geometry(BlockDriverState
*bs
, int *pcyls
, int *pheads
, int *psecs
)
1256 int translation
, lba_detected
= 0;
1257 int cylinders
, heads
, secs
;
1258 uint64_t nb_sectors
;
1260 /* if a geometry hint is available, use it */
1261 bdrv_get_geometry(bs
, &nb_sectors
);
1262 bdrv_get_geometry_hint(bs
, &cylinders
, &heads
, &secs
);
1263 translation
= bdrv_get_translation_hint(bs
);
1264 if (cylinders
!= 0) {
1269 if (guess_disk_lchs(bs
, &cylinders
, &heads
, &secs
) == 0) {
1271 /* if heads > 16, it means that a BIOS LBA
1272 translation was active, so the default
1273 hardware geometry is OK */
1275 goto default_geometry
;
1280 /* disable any translation to be in sync with
1281 the logical geometry */
1282 if (translation
== BIOS_ATA_TRANSLATION_AUTO
) {
1283 bdrv_set_translation_hint(bs
,
1284 BIOS_ATA_TRANSLATION_NONE
);
1289 /* if no geometry, use a standard physical disk geometry */
1290 cylinders
= nb_sectors
/ (16 * 63);
1292 if (cylinders
> 16383)
1294 else if (cylinders
< 2)
1299 if ((lba_detected
== 1) && (translation
== BIOS_ATA_TRANSLATION_AUTO
)) {
1300 if ((*pcyls
* *pheads
) <= 131072) {
1301 bdrv_set_translation_hint(bs
,
1302 BIOS_ATA_TRANSLATION_LARGE
);
1304 bdrv_set_translation_hint(bs
,
1305 BIOS_ATA_TRANSLATION_LBA
);
1309 bdrv_set_geometry_hint(bs
, *pcyls
, *pheads
, *psecs
);
1313 void bdrv_set_geometry_hint(BlockDriverState
*bs
,
1314 int cyls
, int heads
, int secs
)
1321 void bdrv_set_translation_hint(BlockDriverState
*bs
, int translation
)
1323 bs
->translation
= translation
;
1326 void bdrv_get_geometry_hint(BlockDriverState
*bs
,
1327 int *pcyls
, int *pheads
, int *psecs
)
1330 *pheads
= bs
->heads
;
1334 /* Recognize floppy formats */
1335 typedef struct FDFormat
{
1342 static const FDFormat fd_formats
[] = {
1343 /* First entry is default format */
1344 /* 1.44 MB 3"1/2 floppy disks */
1345 { FDRIVE_DRV_144
, 18, 80, 1, },
1346 { FDRIVE_DRV_144
, 20, 80, 1, },
1347 { FDRIVE_DRV_144
, 21, 80, 1, },
1348 { FDRIVE_DRV_144
, 21, 82, 1, },
1349 { FDRIVE_DRV_144
, 21, 83, 1, },
1350 { FDRIVE_DRV_144
, 22, 80, 1, },
1351 { FDRIVE_DRV_144
, 23, 80, 1, },
1352 { FDRIVE_DRV_144
, 24, 80, 1, },
1353 /* 2.88 MB 3"1/2 floppy disks */
1354 { FDRIVE_DRV_288
, 36, 80, 1, },
1355 { FDRIVE_DRV_288
, 39, 80, 1, },
1356 { FDRIVE_DRV_288
, 40, 80, 1, },
1357 { FDRIVE_DRV_288
, 44, 80, 1, },
1358 { FDRIVE_DRV_288
, 48, 80, 1, },
1359 /* 720 kB 3"1/2 floppy disks */
1360 { FDRIVE_DRV_144
, 9, 80, 1, },
1361 { FDRIVE_DRV_144
, 10, 80, 1, },
1362 { FDRIVE_DRV_144
, 10, 82, 1, },
1363 { FDRIVE_DRV_144
, 10, 83, 1, },
1364 { FDRIVE_DRV_144
, 13, 80, 1, },
1365 { FDRIVE_DRV_144
, 14, 80, 1, },
1366 /* 1.2 MB 5"1/4 floppy disks */
1367 { FDRIVE_DRV_120
, 15, 80, 1, },
1368 { FDRIVE_DRV_120
, 18, 80, 1, },
1369 { FDRIVE_DRV_120
, 18, 82, 1, },
1370 { FDRIVE_DRV_120
, 18, 83, 1, },
1371 { FDRIVE_DRV_120
, 20, 80, 1, },
1372 /* 720 kB 5"1/4 floppy disks */
1373 { FDRIVE_DRV_120
, 9, 80, 1, },
1374 { FDRIVE_DRV_120
, 11, 80, 1, },
1375 /* 360 kB 5"1/4 floppy disks */
1376 { FDRIVE_DRV_120
, 9, 40, 1, },
1377 { FDRIVE_DRV_120
, 9, 40, 0, },
1378 { FDRIVE_DRV_120
, 10, 41, 1, },
1379 { FDRIVE_DRV_120
, 10, 42, 1, },
1380 /* 320 kB 5"1/4 floppy disks */
1381 { FDRIVE_DRV_120
, 8, 40, 1, },
1382 { FDRIVE_DRV_120
, 8, 40, 0, },
1383 /* 360 kB must match 5"1/4 better than 3"1/2... */
1384 { FDRIVE_DRV_144
, 9, 80, 0, },
1386 { FDRIVE_DRV_NONE
, -1, -1, 0, },
1389 void bdrv_get_floppy_geometry_hint(BlockDriverState
*bs
, int *nb_heads
,
1390 int *max_track
, int *last_sect
,
1391 FDriveType drive_in
, FDriveType
*drive
)
1393 const FDFormat
*parse
;
1394 uint64_t nb_sectors
, size
;
1395 int i
, first_match
, match
;
1397 bdrv_get_geometry_hint(bs
, nb_heads
, max_track
, last_sect
);
1398 if (*nb_heads
!= 0 && *max_track
!= 0 && *last_sect
!= 0) {
1399 /* User defined disk */
1401 bdrv_get_geometry(bs
, &nb_sectors
);
1404 for (i
= 0; ; i
++) {
1405 parse
= &fd_formats
[i
];
1406 if (parse
->drive
== FDRIVE_DRV_NONE
) {
1409 if (drive_in
== parse
->drive
||
1410 drive_in
== FDRIVE_DRV_NONE
) {
1411 size
= (parse
->max_head
+ 1) * parse
->max_track
*
1413 if (nb_sectors
== size
) {
1417 if (first_match
== -1) {
1423 if (first_match
== -1) {
1426 match
= first_match
;
1428 parse
= &fd_formats
[match
];
1430 *nb_heads
= parse
->max_head
+ 1;
1431 *max_track
= parse
->max_track
;
1432 *last_sect
= parse
->last_sect
;
1433 *drive
= parse
->drive
;
1437 int bdrv_get_translation_hint(BlockDriverState
*bs
)
1439 return bs
->translation
;
1442 void bdrv_set_on_error(BlockDriverState
*bs
, BlockErrorAction on_read_error
,
1443 BlockErrorAction on_write_error
)
1445 bs
->on_read_error
= on_read_error
;
1446 bs
->on_write_error
= on_write_error
;
1449 BlockErrorAction
bdrv_get_on_error(BlockDriverState
*bs
, int is_read
)
1451 return is_read
? bs
->on_read_error
: bs
->on_write_error
;
1454 void bdrv_set_removable(BlockDriverState
*bs
, int removable
)
1456 bs
->removable
= removable
;
1457 if (removable
&& bs
== bs_snapshots
) {
1458 bs_snapshots
= NULL
;
1462 int bdrv_is_removable(BlockDriverState
*bs
)
1464 return bs
->removable
;
1467 int bdrv_is_read_only(BlockDriverState
*bs
)
1469 return bs
->read_only
;
1472 int bdrv_is_sg(BlockDriverState
*bs
)
1477 int bdrv_enable_write_cache(BlockDriverState
*bs
)
1479 return bs
->enable_write_cache
;
1482 /* XXX: no longer used */
1483 void bdrv_set_change_cb(BlockDriverState
*bs
,
1484 void (*change_cb
)(void *opaque
, int reason
),
1487 bs
->change_cb
= change_cb
;
1488 bs
->change_opaque
= opaque
;
1491 int bdrv_is_encrypted(BlockDriverState
*bs
)
1493 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
1495 return bs
->encrypted
;
1498 int bdrv_key_required(BlockDriverState
*bs
)
1500 BlockDriverState
*backing_hd
= bs
->backing_hd
;
1502 if (backing_hd
&& backing_hd
->encrypted
&& !backing_hd
->valid_key
)
1504 return (bs
->encrypted
&& !bs
->valid_key
);
1507 int bdrv_set_key(BlockDriverState
*bs
, const char *key
)
1510 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
) {
1511 ret
= bdrv_set_key(bs
->backing_hd
, key
);
1517 if (!bs
->encrypted
) {
1519 } else if (!bs
->drv
|| !bs
->drv
->bdrv_set_key
) {
1522 ret
= bs
->drv
->bdrv_set_key(bs
, key
);
1525 } else if (!bs
->valid_key
) {
1527 /* call the change callback now, we skipped it on open */
1528 bs
->media_changed
= 1;
1530 bs
->change_cb(bs
->change_opaque
, CHANGE_MEDIA
);
1535 void bdrv_get_format(BlockDriverState
*bs
, char *buf
, int buf_size
)
1540 pstrcpy(buf
, buf_size
, bs
->drv
->format_name
);
1544 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
1549 QLIST_FOREACH(drv
, &bdrv_drivers
, list
) {
1550 it(opaque
, drv
->format_name
);
1554 BlockDriverState
*bdrv_find(const char *name
)
1556 BlockDriverState
*bs
;
1558 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1559 if (!strcmp(name
, bs
->device_name
)) {
1566 BlockDriverState
*bdrv_next(BlockDriverState
*bs
)
1569 return QTAILQ_FIRST(&bdrv_states
);
1571 return QTAILQ_NEXT(bs
, list
);
1574 void bdrv_iterate(void (*it
)(void *opaque
, BlockDriverState
*bs
), void *opaque
)
1576 BlockDriverState
*bs
;
1578 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1583 const char *bdrv_get_device_name(BlockDriverState
*bs
)
1585 return bs
->device_name
;
1588 int bdrv_flush(BlockDriverState
*bs
)
1590 if (bs
->open_flags
& BDRV_O_NO_FLUSH
) {
1594 if (bs
->drv
&& bs
->drv
->bdrv_flush
) {
1595 return bs
->drv
->bdrv_flush(bs
);
1599 * Some block drivers always operate in either writethrough or unsafe mode
1600 * and don't support bdrv_flush therefore. Usually qemu doesn't know how
1601 * the server works (because the behaviour is hardcoded or depends on
1602 * server-side configuration), so we can't ensure that everything is safe
1603 * on disk. Returning an error doesn't work because that would break guests
1604 * even if the server operates in writethrough mode.
1606 * Let's hope the user knows what he's doing.
1611 void bdrv_flush_all(void)
1613 BlockDriverState
*bs
;
1615 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1616 if (bs
->drv
&& !bdrv_is_read_only(bs
) &&
1617 (!bdrv_is_removable(bs
) || bdrv_is_inserted(bs
))) {
1623 int bdrv_has_zero_init(BlockDriverState
*bs
)
1627 if (bs
->drv
->bdrv_has_zero_init
) {
1628 return bs
->drv
->bdrv_has_zero_init(bs
);
1634 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
)
1639 if (!bs
->drv
->bdrv_discard
) {
1642 return bs
->drv
->bdrv_discard(bs
, sector_num
, nb_sectors
);
1646 * Returns true iff the specified sector is present in the disk image. Drivers
1647 * not implementing the functionality are assumed to not support backing files,
1648 * hence all their sectors are reported as allocated.
1650 * 'pnum' is set to the number of sectors (including and immediately following
1651 * the specified sector) that are known to be in the same
1652 * allocated/unallocated state.
1654 * 'nb_sectors' is the max value 'pnum' should be set to.
1656 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
1660 if (!bs
->drv
->bdrv_is_allocated
) {
1661 if (sector_num
>= bs
->total_sectors
) {
1665 n
= bs
->total_sectors
- sector_num
;
1666 *pnum
= (n
< nb_sectors
) ? (n
) : (nb_sectors
);
1669 return bs
->drv
->bdrv_is_allocated(bs
, sector_num
, nb_sectors
, pnum
);
1672 void bdrv_mon_event(const BlockDriverState
*bdrv
,
1673 BlockMonEventAction action
, int is_read
)
1676 const char *action_str
;
1679 case BDRV_ACTION_REPORT
:
1680 action_str
= "report";
1682 case BDRV_ACTION_IGNORE
:
1683 action_str
= "ignore";
1685 case BDRV_ACTION_STOP
:
1686 action_str
= "stop";
1692 data
= qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1695 is_read
? "read" : "write");
1696 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR
, data
);
1698 qobject_decref(data
);
1701 static void bdrv_print_dict(QObject
*obj
, void *opaque
)
1704 Monitor
*mon
= opaque
;
1706 bs_dict
= qobject_to_qdict(obj
);
1708 monitor_printf(mon
, "%s: removable=%d",
1709 qdict_get_str(bs_dict
, "device"),
1710 qdict_get_bool(bs_dict
, "removable"));
1712 if (qdict_get_bool(bs_dict
, "removable")) {
1713 monitor_printf(mon
, " locked=%d", qdict_get_bool(bs_dict
, "locked"));
1716 if (qdict_haskey(bs_dict
, "inserted")) {
1717 QDict
*qdict
= qobject_to_qdict(qdict_get(bs_dict
, "inserted"));
1719 monitor_printf(mon
, " file=");
1720 monitor_print_filename(mon
, qdict_get_str(qdict
, "file"));
1721 if (qdict_haskey(qdict
, "backing_file")) {
1722 monitor_printf(mon
, " backing_file=");
1723 monitor_print_filename(mon
, qdict_get_str(qdict
, "backing_file"));
1725 monitor_printf(mon
, " ro=%d drv=%s encrypted=%d",
1726 qdict_get_bool(qdict
, "ro"),
1727 qdict_get_str(qdict
, "drv"),
1728 qdict_get_bool(qdict
, "encrypted"));
1730 monitor_printf(mon
, " [not inserted]");
1733 monitor_printf(mon
, "\n");
1736 void bdrv_info_print(Monitor
*mon
, const QObject
*data
)
1738 qlist_iter(qobject_to_qlist(data
), bdrv_print_dict
, mon
);
1741 void bdrv_info(Monitor
*mon
, QObject
**ret_data
)
1744 BlockDriverState
*bs
;
1746 bs_list
= qlist_new();
1748 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1751 bs_obj
= qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', "
1752 "'removable': %i, 'locked': %i }",
1753 bs
->device_name
, bs
->removable
,
1758 QDict
*bs_dict
= qobject_to_qdict(bs_obj
);
1760 obj
= qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1761 "'encrypted': %i }",
1762 bs
->filename
, bs
->read_only
,
1763 bs
->drv
->format_name
,
1764 bdrv_is_encrypted(bs
));
1765 if (bs
->backing_file
[0] != '\0') {
1766 QDict
*qdict
= qobject_to_qdict(obj
);
1767 qdict_put(qdict
, "backing_file",
1768 qstring_from_str(bs
->backing_file
));
1771 qdict_put_obj(bs_dict
, "inserted", obj
);
1773 qlist_append_obj(bs_list
, bs_obj
);
1776 *ret_data
= QOBJECT(bs_list
);
1779 static void bdrv_stats_iter(QObject
*data
, void *opaque
)
1782 Monitor
*mon
= opaque
;
1784 qdict
= qobject_to_qdict(data
);
1785 monitor_printf(mon
, "%s:", qdict_get_str(qdict
, "device"));
1787 qdict
= qobject_to_qdict(qdict_get(qdict
, "stats"));
1788 monitor_printf(mon
, " rd_bytes=%" PRId64
1789 " wr_bytes=%" PRId64
1790 " rd_operations=%" PRId64
1791 " wr_operations=%" PRId64
1793 qdict_get_int(qdict
, "rd_bytes"),
1794 qdict_get_int(qdict
, "wr_bytes"),
1795 qdict_get_int(qdict
, "rd_operations"),
1796 qdict_get_int(qdict
, "wr_operations"));
1799 void bdrv_stats_print(Monitor
*mon
, const QObject
*data
)
1801 qlist_iter(qobject_to_qlist(data
), bdrv_stats_iter
, mon
);
1804 static QObject
* bdrv_info_stats_bs(BlockDriverState
*bs
)
1809 res
= qobject_from_jsonf("{ 'stats': {"
1810 "'rd_bytes': %" PRId64
","
1811 "'wr_bytes': %" PRId64
","
1812 "'rd_operations': %" PRId64
","
1813 "'wr_operations': %" PRId64
","
1814 "'wr_highest_offset': %" PRId64
1816 bs
->rd_bytes
, bs
->wr_bytes
,
1817 bs
->rd_ops
, bs
->wr_ops
,
1818 bs
->wr_highest_sector
*
1819 (uint64_t)BDRV_SECTOR_SIZE
);
1820 dict
= qobject_to_qdict(res
);
1822 if (*bs
->device_name
) {
1823 qdict_put(dict
, "device", qstring_from_str(bs
->device_name
));
1827 QObject
*parent
= bdrv_info_stats_bs(bs
->file
);
1828 qdict_put_obj(dict
, "parent", parent
);
1834 void bdrv_info_stats(Monitor
*mon
, QObject
**ret_data
)
1838 BlockDriverState
*bs
;
1840 devices
= qlist_new();
1842 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1843 obj
= bdrv_info_stats_bs(bs
);
1844 qlist_append_obj(devices
, obj
);
1847 *ret_data
= QOBJECT(devices
);
1850 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
)
1852 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
1853 return bs
->backing_file
;
1854 else if (bs
->encrypted
)
1855 return bs
->filename
;
1860 void bdrv_get_backing_filename(BlockDriverState
*bs
,
1861 char *filename
, int filename_size
)
1863 if (!bs
->backing_file
) {
1864 pstrcpy(filename
, filename_size
, "");
1866 pstrcpy(filename
, filename_size
, bs
->backing_file
);
1870 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
1871 const uint8_t *buf
, int nb_sectors
)
1873 BlockDriver
*drv
= bs
->drv
;
1876 if (!drv
->bdrv_write_compressed
)
1878 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
1881 if (bs
->dirty_bitmap
) {
1882 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
1885 return drv
->bdrv_write_compressed(bs
, sector_num
, buf
, nb_sectors
);
1888 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
1890 BlockDriver
*drv
= bs
->drv
;
1893 if (!drv
->bdrv_get_info
)
1895 memset(bdi
, 0, sizeof(*bdi
));
1896 return drv
->bdrv_get_info(bs
, bdi
);
1899 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
1900 int64_t pos
, int size
)
1902 BlockDriver
*drv
= bs
->drv
;
1905 if (drv
->bdrv_save_vmstate
)
1906 return drv
->bdrv_save_vmstate(bs
, buf
, pos
, size
);
1908 return bdrv_save_vmstate(bs
->file
, buf
, pos
, size
);
1912 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
1913 int64_t pos
, int size
)
1915 BlockDriver
*drv
= bs
->drv
;
1918 if (drv
->bdrv_load_vmstate
)
1919 return drv
->bdrv_load_vmstate(bs
, buf
, pos
, size
);
1921 return bdrv_load_vmstate(bs
->file
, buf
, pos
, size
);
1925 void bdrv_debug_event(BlockDriverState
*bs
, BlkDebugEvent event
)
1927 BlockDriver
*drv
= bs
->drv
;
1929 if (!drv
|| !drv
->bdrv_debug_event
) {
1933 return drv
->bdrv_debug_event(bs
, event
);
1937 /**************************************************************/
1938 /* handling of snapshots */
1940 int bdrv_can_snapshot(BlockDriverState
*bs
)
1942 BlockDriver
*drv
= bs
->drv
;
1943 if (!drv
|| bdrv_is_removable(bs
) || bdrv_is_read_only(bs
)) {
1947 if (!drv
->bdrv_snapshot_create
) {
1948 if (bs
->file
!= NULL
) {
1949 return bdrv_can_snapshot(bs
->file
);
1957 int bdrv_is_snapshot(BlockDriverState
*bs
)
1959 return !!(bs
->open_flags
& BDRV_O_SNAPSHOT
);
1962 BlockDriverState
*bdrv_snapshots(void)
1964 BlockDriverState
*bs
;
1967 return bs_snapshots
;
1971 while ((bs
= bdrv_next(bs
))) {
1972 if (bdrv_can_snapshot(bs
)) {
1980 int bdrv_snapshot_create(BlockDriverState
*bs
,
1981 QEMUSnapshotInfo
*sn_info
)
1983 BlockDriver
*drv
= bs
->drv
;
1986 if (drv
->bdrv_snapshot_create
)
1987 return drv
->bdrv_snapshot_create(bs
, sn_info
);
1989 return bdrv_snapshot_create(bs
->file
, sn_info
);
1993 int bdrv_snapshot_goto(BlockDriverState
*bs
,
1994 const char *snapshot_id
)
1996 BlockDriver
*drv
= bs
->drv
;
2001 if (drv
->bdrv_snapshot_goto
)
2002 return drv
->bdrv_snapshot_goto(bs
, snapshot_id
);
2005 drv
->bdrv_close(bs
);
2006 ret
= bdrv_snapshot_goto(bs
->file
, snapshot_id
);
2007 open_ret
= drv
->bdrv_open(bs
, bs
->open_flags
);
2009 bdrv_delete(bs
->file
);
2019 int bdrv_snapshot_delete(BlockDriverState
*bs
, const char *snapshot_id
)
2021 BlockDriver
*drv
= bs
->drv
;
2024 if (drv
->bdrv_snapshot_delete
)
2025 return drv
->bdrv_snapshot_delete(bs
, snapshot_id
);
2027 return bdrv_snapshot_delete(bs
->file
, snapshot_id
);
2031 int bdrv_snapshot_list(BlockDriverState
*bs
,
2032 QEMUSnapshotInfo
**psn_info
)
2034 BlockDriver
*drv
= bs
->drv
;
2037 if (drv
->bdrv_snapshot_list
)
2038 return drv
->bdrv_snapshot_list(bs
, psn_info
);
2040 return bdrv_snapshot_list(bs
->file
, psn_info
);
2044 int bdrv_snapshot_load_tmp(BlockDriverState
*bs
,
2045 const char *snapshot_name
)
2047 BlockDriver
*drv
= bs
->drv
;
2051 if (!bs
->read_only
) {
2054 if (drv
->bdrv_snapshot_load_tmp
) {
2055 return drv
->bdrv_snapshot_load_tmp(bs
, snapshot_name
);
2060 #define NB_SUFFIXES 4
2062 char *get_human_readable_size(char *buf
, int buf_size
, int64_t size
)
2064 static const char suffixes
[NB_SUFFIXES
] = "KMGT";
2069 snprintf(buf
, buf_size
, "%" PRId64
, size
);
2072 for(i
= 0; i
< NB_SUFFIXES
; i
++) {
2073 if (size
< (10 * base
)) {
2074 snprintf(buf
, buf_size
, "%0.1f%c",
2075 (double)size
/ base
,
2078 } else if (size
< (1000 * base
) || i
== (NB_SUFFIXES
- 1)) {
2079 snprintf(buf
, buf_size
, "%" PRId64
"%c",
2080 ((size
+ (base
>> 1)) / base
),
2090 char *bdrv_snapshot_dump(char *buf
, int buf_size
, QEMUSnapshotInfo
*sn
)
2092 char buf1
[128], date_buf
[128], clock_buf
[128];
2102 snprintf(buf
, buf_size
,
2103 "%-10s%-20s%7s%20s%15s",
2104 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2108 ptm
= localtime(&ti
);
2109 strftime(date_buf
, sizeof(date_buf
),
2110 "%Y-%m-%d %H:%M:%S", ptm
);
2112 localtime_r(&ti
, &tm
);
2113 strftime(date_buf
, sizeof(date_buf
),
2114 "%Y-%m-%d %H:%M:%S", &tm
);
2116 secs
= sn
->vm_clock_nsec
/ 1000000000;
2117 snprintf(clock_buf
, sizeof(clock_buf
),
2118 "%02d:%02d:%02d.%03d",
2120 (int)((secs
/ 60) % 60),
2122 (int)((sn
->vm_clock_nsec
/ 1000000) % 1000));
2123 snprintf(buf
, buf_size
,
2124 "%-10s%-20s%7s%20s%15s",
2125 sn
->id_str
, sn
->name
,
2126 get_human_readable_size(buf1
, sizeof(buf1
), sn
->vm_state_size
),
2134 /**************************************************************/
2137 BlockDriverAIOCB
*bdrv_aio_readv(BlockDriverState
*bs
, int64_t sector_num
,
2138 QEMUIOVector
*qiov
, int nb_sectors
,
2139 BlockDriverCompletionFunc
*cb
, void *opaque
)
2141 BlockDriver
*drv
= bs
->drv
;
2142 BlockDriverAIOCB
*ret
;
2144 trace_bdrv_aio_readv(bs
, sector_num
, nb_sectors
, opaque
);
2148 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
2151 ret
= drv
->bdrv_aio_readv(bs
, sector_num
, qiov
, nb_sectors
,
2155 /* Update stats even though technically transfer has not happened. */
2156 bs
->rd_bytes
+= (unsigned) nb_sectors
* BDRV_SECTOR_SIZE
;
2163 typedef struct BlockCompleteData
{
2164 BlockDriverCompletionFunc
*cb
;
2166 BlockDriverState
*bs
;
2169 } BlockCompleteData
;
2171 static void block_complete_cb(void *opaque
, int ret
)
2173 BlockCompleteData
*b
= opaque
;
2175 if (b
->bs
->dirty_bitmap
) {
2176 set_dirty_bitmap(b
->bs
, b
->sector_num
, b
->nb_sectors
, 1);
2178 b
->cb(b
->opaque
, ret
);
2182 static BlockCompleteData
*blk_dirty_cb_alloc(BlockDriverState
*bs
,
2185 BlockDriverCompletionFunc
*cb
,
2188 BlockCompleteData
*blkdata
= qemu_mallocz(sizeof(BlockCompleteData
));
2192 blkdata
->opaque
= opaque
;
2193 blkdata
->sector_num
= sector_num
;
2194 blkdata
->nb_sectors
= nb_sectors
;
2199 BlockDriverAIOCB
*bdrv_aio_writev(BlockDriverState
*bs
, int64_t sector_num
,
2200 QEMUIOVector
*qiov
, int nb_sectors
,
2201 BlockDriverCompletionFunc
*cb
, void *opaque
)
2203 BlockDriver
*drv
= bs
->drv
;
2204 BlockDriverAIOCB
*ret
;
2205 BlockCompleteData
*blk_cb_data
;
2207 trace_bdrv_aio_writev(bs
, sector_num
, nb_sectors
, opaque
);
2213 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
2216 if (bs
->dirty_bitmap
) {
2217 blk_cb_data
= blk_dirty_cb_alloc(bs
, sector_num
, nb_sectors
, cb
,
2219 cb
= &block_complete_cb
;
2220 opaque
= blk_cb_data
;
2223 ret
= drv
->bdrv_aio_writev(bs
, sector_num
, qiov
, nb_sectors
,
2227 /* Update stats even though technically transfer has not happened. */
2228 bs
->wr_bytes
+= (unsigned) nb_sectors
* BDRV_SECTOR_SIZE
;
2230 if (bs
->wr_highest_sector
< sector_num
+ nb_sectors
- 1) {
2231 bs
->wr_highest_sector
= sector_num
+ nb_sectors
- 1;
2239 typedef struct MultiwriteCB
{
2244 BlockDriverCompletionFunc
*cb
;
2246 QEMUIOVector
*free_qiov
;
2251 static void multiwrite_user_cb(MultiwriteCB
*mcb
)
2255 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2256 mcb
->callbacks
[i
].cb(mcb
->callbacks
[i
].opaque
, mcb
->error
);
2257 if (mcb
->callbacks
[i
].free_qiov
) {
2258 qemu_iovec_destroy(mcb
->callbacks
[i
].free_qiov
);
2260 qemu_free(mcb
->callbacks
[i
].free_qiov
);
2261 qemu_vfree(mcb
->callbacks
[i
].free_buf
);
2265 static void multiwrite_cb(void *opaque
, int ret
)
2267 MultiwriteCB
*mcb
= opaque
;
2269 trace_multiwrite_cb(mcb
, ret
);
2271 if (ret
< 0 && !mcb
->error
) {
2275 mcb
->num_requests
--;
2276 if (mcb
->num_requests
== 0) {
2277 multiwrite_user_cb(mcb
);
2282 static int multiwrite_req_compare(const void *a
, const void *b
)
2284 const BlockRequest
*req1
= a
, *req2
= b
;
2287 * Note that we can't simply subtract req2->sector from req1->sector
2288 * here as that could overflow the return value.
2290 if (req1
->sector
> req2
->sector
) {
2292 } else if (req1
->sector
< req2
->sector
) {
2300 * Takes a bunch of requests and tries to merge them. Returns the number of
2301 * requests that remain after merging.
2303 static int multiwrite_merge(BlockDriverState
*bs
, BlockRequest
*reqs
,
2304 int num_reqs
, MultiwriteCB
*mcb
)
2308 // Sort requests by start sector
2309 qsort(reqs
, num_reqs
, sizeof(*reqs
), &multiwrite_req_compare
);
2311 // Check if adjacent requests touch the same clusters. If so, combine them,
2312 // filling up gaps with zero sectors.
2314 for (i
= 1; i
< num_reqs
; i
++) {
2316 int64_t oldreq_last
= reqs
[outidx
].sector
+ reqs
[outidx
].nb_sectors
;
2318 // This handles the cases that are valid for all block drivers, namely
2319 // exactly sequential writes and overlapping writes.
2320 if (reqs
[i
].sector
<= oldreq_last
) {
2324 // The block driver may decide that it makes sense to combine requests
2325 // even if there is a gap of some sectors between them. In this case,
2326 // the gap is filled with zeros (therefore only applicable for yet
2327 // unused space in format like qcow2).
2328 if (!merge
&& bs
->drv
->bdrv_merge_requests
) {
2329 merge
= bs
->drv
->bdrv_merge_requests(bs
, &reqs
[outidx
], &reqs
[i
]);
2332 if (reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1 > IOV_MAX
) {
2338 QEMUIOVector
*qiov
= qemu_mallocz(sizeof(*qiov
));
2339 qemu_iovec_init(qiov
,
2340 reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1);
2342 // Add the first request to the merged one. If the requests are
2343 // overlapping, drop the last sectors of the first request.
2344 size
= (reqs
[i
].sector
- reqs
[outidx
].sector
) << 9;
2345 qemu_iovec_concat(qiov
, reqs
[outidx
].qiov
, size
);
2347 // We might need to add some zeros between the two requests
2348 if (reqs
[i
].sector
> oldreq_last
) {
2349 size_t zero_bytes
= (reqs
[i
].sector
- oldreq_last
) << 9;
2350 uint8_t *buf
= qemu_blockalign(bs
, zero_bytes
);
2351 memset(buf
, 0, zero_bytes
);
2352 qemu_iovec_add(qiov
, buf
, zero_bytes
);
2353 mcb
->callbacks
[i
].free_buf
= buf
;
2356 // Add the second request
2357 qemu_iovec_concat(qiov
, reqs
[i
].qiov
, reqs
[i
].qiov
->size
);
2359 reqs
[outidx
].nb_sectors
= qiov
->size
>> 9;
2360 reqs
[outidx
].qiov
= qiov
;
2362 mcb
->callbacks
[i
].free_qiov
= reqs
[outidx
].qiov
;
2365 reqs
[outidx
].sector
= reqs
[i
].sector
;
2366 reqs
[outidx
].nb_sectors
= reqs
[i
].nb_sectors
;
2367 reqs
[outidx
].qiov
= reqs
[i
].qiov
;
2375 * Submit multiple AIO write requests at once.
2377 * On success, the function returns 0 and all requests in the reqs array have
2378 * been submitted. In error case this function returns -1, and any of the
2379 * requests may or may not be submitted yet. In particular, this means that the
2380 * callback will be called for some of the requests, for others it won't. The
2381 * caller must check the error field of the BlockRequest to wait for the right
2382 * callbacks (if error != 0, no callback will be called).
2384 * The implementation may modify the contents of the reqs array, e.g. to merge
2385 * requests. However, the fields opaque and error are left unmodified as they
2386 * are used to signal failure for a single request to the caller.
2388 int bdrv_aio_multiwrite(BlockDriverState
*bs
, BlockRequest
*reqs
, int num_reqs
)
2390 BlockDriverAIOCB
*acb
;
2394 /* don't submit writes if we don't have a medium */
2395 if (bs
->drv
== NULL
) {
2396 for (i
= 0; i
< num_reqs
; i
++) {
2397 reqs
[i
].error
= -ENOMEDIUM
;
2402 if (num_reqs
== 0) {
2406 // Create MultiwriteCB structure
2407 mcb
= qemu_mallocz(sizeof(*mcb
) + num_reqs
* sizeof(*mcb
->callbacks
));
2408 mcb
->num_requests
= 0;
2409 mcb
->num_callbacks
= num_reqs
;
2411 for (i
= 0; i
< num_reqs
; i
++) {
2412 mcb
->callbacks
[i
].cb
= reqs
[i
].cb
;
2413 mcb
->callbacks
[i
].opaque
= reqs
[i
].opaque
;
2416 // Check for mergable requests
2417 num_reqs
= multiwrite_merge(bs
, reqs
, num_reqs
, mcb
);
2419 trace_bdrv_aio_multiwrite(mcb
, mcb
->num_callbacks
, num_reqs
);
2422 * Run the aio requests. As soon as one request can't be submitted
2423 * successfully, fail all requests that are not yet submitted (we must
2424 * return failure for all requests anyway)
2426 * num_requests cannot be set to the right value immediately: If
2427 * bdrv_aio_writev fails for some request, num_requests would be too high
2428 * and therefore multiwrite_cb() would never recognize the multiwrite
2429 * request as completed. We also cannot use the loop variable i to set it
2430 * when the first request fails because the callback may already have been
2431 * called for previously submitted requests. Thus, num_requests must be
2432 * incremented for each request that is submitted.
2434 * The problem that callbacks may be called early also means that we need
2435 * to take care that num_requests doesn't become 0 before all requests are
2436 * submitted - multiwrite_cb() would consider the multiwrite request
2437 * completed. A dummy request that is "completed" by a manual call to
2438 * multiwrite_cb() takes care of this.
2440 mcb
->num_requests
= 1;
2442 // Run the aio requests
2443 for (i
= 0; i
< num_reqs
; i
++) {
2444 mcb
->num_requests
++;
2445 acb
= bdrv_aio_writev(bs
, reqs
[i
].sector
, reqs
[i
].qiov
,
2446 reqs
[i
].nb_sectors
, multiwrite_cb
, mcb
);
2449 // We can only fail the whole thing if no request has been
2450 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2451 // complete and report the error in the callback.
2453 trace_bdrv_aio_multiwrite_earlyfail(mcb
);
2456 trace_bdrv_aio_multiwrite_latefail(mcb
, i
);
2457 multiwrite_cb(mcb
, -EIO
);
2463 /* Complete the dummy request */
2464 multiwrite_cb(mcb
, 0);
2469 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2470 reqs
[i
].error
= -EIO
;
2476 BlockDriverAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
2477 BlockDriverCompletionFunc
*cb
, void *opaque
)
2479 BlockDriver
*drv
= bs
->drv
;
2481 trace_bdrv_aio_flush(bs
, opaque
);
2483 if (bs
->open_flags
& BDRV_O_NO_FLUSH
) {
2484 return bdrv_aio_noop_em(bs
, cb
, opaque
);
2489 return drv
->bdrv_aio_flush(bs
, cb
, opaque
);
2492 void bdrv_aio_cancel(BlockDriverAIOCB
*acb
)
2494 acb
->pool
->cancel(acb
);
2498 /**************************************************************/
2499 /* async block device emulation */
2501 typedef struct BlockDriverAIOCBSync
{
2502 BlockDriverAIOCB common
;
2505 /* vector translation state */
2509 } BlockDriverAIOCBSync
;
2511 static void bdrv_aio_cancel_em(BlockDriverAIOCB
*blockacb
)
2513 BlockDriverAIOCBSync
*acb
=
2514 container_of(blockacb
, BlockDriverAIOCBSync
, common
);
2515 qemu_bh_delete(acb
->bh
);
2517 qemu_aio_release(acb
);
2520 static AIOPool bdrv_em_aio_pool
= {
2521 .aiocb_size
= sizeof(BlockDriverAIOCBSync
),
2522 .cancel
= bdrv_aio_cancel_em
,
2525 static void bdrv_aio_bh_cb(void *opaque
)
2527 BlockDriverAIOCBSync
*acb
= opaque
;
2530 qemu_iovec_from_buffer(acb
->qiov
, acb
->bounce
, acb
->qiov
->size
);
2531 qemu_vfree(acb
->bounce
);
2532 acb
->common
.cb(acb
->common
.opaque
, acb
->ret
);
2533 qemu_bh_delete(acb
->bh
);
2535 qemu_aio_release(acb
);
2538 static BlockDriverAIOCB
*bdrv_aio_rw_vector(BlockDriverState
*bs
,
2542 BlockDriverCompletionFunc
*cb
,
2547 BlockDriverAIOCBSync
*acb
;
2549 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2550 acb
->is_write
= is_write
;
2552 acb
->bounce
= qemu_blockalign(bs
, qiov
->size
);
2555 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2558 qemu_iovec_to_buffer(acb
->qiov
, acb
->bounce
);
2559 acb
->ret
= bdrv_write(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2561 acb
->ret
= bdrv_read(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2564 qemu_bh_schedule(acb
->bh
);
2566 return &acb
->common
;
2569 static BlockDriverAIOCB
*bdrv_aio_readv_em(BlockDriverState
*bs
,
2570 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2571 BlockDriverCompletionFunc
*cb
, void *opaque
)
2573 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 0);
2576 static BlockDriverAIOCB
*bdrv_aio_writev_em(BlockDriverState
*bs
,
2577 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2578 BlockDriverCompletionFunc
*cb
, void *opaque
)
2580 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 1);
2583 static BlockDriverAIOCB
*bdrv_aio_flush_em(BlockDriverState
*bs
,
2584 BlockDriverCompletionFunc
*cb
, void *opaque
)
2586 BlockDriverAIOCBSync
*acb
;
2588 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2589 acb
->is_write
= 1; /* don't bounce in the completion hadler */
2595 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2598 qemu_bh_schedule(acb
->bh
);
2599 return &acb
->common
;
2602 static BlockDriverAIOCB
*bdrv_aio_noop_em(BlockDriverState
*bs
,
2603 BlockDriverCompletionFunc
*cb
, void *opaque
)
2605 BlockDriverAIOCBSync
*acb
;
2607 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2608 acb
->is_write
= 1; /* don't bounce in the completion handler */
2614 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2617 qemu_bh_schedule(acb
->bh
);
2618 return &acb
->common
;
2621 /**************************************************************/
2622 /* sync block device emulation */
2624 static void bdrv_rw_em_cb(void *opaque
, int ret
)
2626 *(int *)opaque
= ret
;
2629 #define NOT_DONE 0x7fffffff
2631 static int bdrv_read_em(BlockDriverState
*bs
, int64_t sector_num
,
2632 uint8_t *buf
, int nb_sectors
)
2635 BlockDriverAIOCB
*acb
;
2639 async_context_push();
2641 async_ret
= NOT_DONE
;
2642 iov
.iov_base
= (void *)buf
;
2643 iov
.iov_len
= nb_sectors
* BDRV_SECTOR_SIZE
;
2644 qemu_iovec_init_external(&qiov
, &iov
, 1);
2645 acb
= bdrv_aio_readv(bs
, sector_num
, &qiov
, nb_sectors
,
2646 bdrv_rw_em_cb
, &async_ret
);
2652 while (async_ret
== NOT_DONE
) {
2658 async_context_pop();
2662 static int bdrv_write_em(BlockDriverState
*bs
, int64_t sector_num
,
2663 const uint8_t *buf
, int nb_sectors
)
2666 BlockDriverAIOCB
*acb
;
2670 async_context_push();
2672 async_ret
= NOT_DONE
;
2673 iov
.iov_base
= (void *)buf
;
2674 iov
.iov_len
= nb_sectors
* BDRV_SECTOR_SIZE
;
2675 qemu_iovec_init_external(&qiov
, &iov
, 1);
2676 acb
= bdrv_aio_writev(bs
, sector_num
, &qiov
, nb_sectors
,
2677 bdrv_rw_em_cb
, &async_ret
);
2682 while (async_ret
== NOT_DONE
) {
2687 async_context_pop();
2691 void bdrv_init(void)
2693 module_call_init(MODULE_INIT_BLOCK
);
2696 void bdrv_init_with_whitelist(void)
2698 use_bdrv_whitelist
= 1;
2702 void *qemu_aio_get(AIOPool
*pool
, BlockDriverState
*bs
,
2703 BlockDriverCompletionFunc
*cb
, void *opaque
)
2705 BlockDriverAIOCB
*acb
;
2707 if (pool
->free_aiocb
) {
2708 acb
= pool
->free_aiocb
;
2709 pool
->free_aiocb
= acb
->next
;
2711 acb
= qemu_mallocz(pool
->aiocb_size
);
2716 acb
->opaque
= opaque
;
2720 void qemu_aio_release(void *p
)
2722 BlockDriverAIOCB
*acb
= (BlockDriverAIOCB
*)p
;
2723 AIOPool
*pool
= acb
->pool
;
2724 acb
->next
= pool
->free_aiocb
;
2725 pool
->free_aiocb
= acb
;
2728 /**************************************************************/
2729 /* removable device support */
2732 * Return TRUE if the media is present
2734 int bdrv_is_inserted(BlockDriverState
*bs
)
2736 BlockDriver
*drv
= bs
->drv
;
2740 if (!drv
->bdrv_is_inserted
)
2741 return !bs
->tray_open
;
2742 ret
= drv
->bdrv_is_inserted(bs
);
2747 * Return TRUE if the media changed since the last call to this
2748 * function. It is currently only used for floppy disks
2750 int bdrv_media_changed(BlockDriverState
*bs
)
2752 BlockDriver
*drv
= bs
->drv
;
2755 if (!drv
|| !drv
->bdrv_media_changed
)
2758 ret
= drv
->bdrv_media_changed(bs
);
2759 if (ret
== -ENOTSUP
)
2760 ret
= bs
->media_changed
;
2761 bs
->media_changed
= 0;
2766 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2768 int bdrv_eject(BlockDriverState
*bs
, int eject_flag
)
2770 BlockDriver
*drv
= bs
->drv
;
2777 if (!drv
|| !drv
->bdrv_eject
) {
2780 ret
= drv
->bdrv_eject(bs
, eject_flag
);
2782 if (ret
== -ENOTSUP
) {
2786 bs
->tray_open
= eject_flag
;
2792 int bdrv_is_locked(BlockDriverState
*bs
)
2798 * Lock or unlock the media (if it is locked, the user won't be able
2799 * to eject it manually).
2801 void bdrv_set_locked(BlockDriverState
*bs
, int locked
)
2803 BlockDriver
*drv
= bs
->drv
;
2805 trace_bdrv_set_locked(bs
, locked
);
2807 bs
->locked
= locked
;
2808 if (drv
&& drv
->bdrv_set_locked
) {
2809 drv
->bdrv_set_locked(bs
, locked
);
2813 /* needed for generic scsi interface */
2815 int bdrv_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
2817 BlockDriver
*drv
= bs
->drv
;
2819 if (drv
&& drv
->bdrv_ioctl
)
2820 return drv
->bdrv_ioctl(bs
, req
, buf
);
2824 BlockDriverAIOCB
*bdrv_aio_ioctl(BlockDriverState
*bs
,
2825 unsigned long int req
, void *buf
,
2826 BlockDriverCompletionFunc
*cb
, void *opaque
)
2828 BlockDriver
*drv
= bs
->drv
;
2830 if (drv
&& drv
->bdrv_aio_ioctl
)
2831 return drv
->bdrv_aio_ioctl(bs
, req
, buf
, cb
, opaque
);
2837 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
)
2839 return qemu_memalign((bs
&& bs
->buffer_alignment
) ? bs
->buffer_alignment
: 512, size
);
2842 void bdrv_set_dirty_tracking(BlockDriverState
*bs
, int enable
)
2844 int64_t bitmap_size
;
2846 bs
->dirty_count
= 0;
2848 if (!bs
->dirty_bitmap
) {
2849 bitmap_size
= (bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
) +
2850 BDRV_SECTORS_PER_DIRTY_CHUNK
* 8 - 1;
2851 bitmap_size
/= BDRV_SECTORS_PER_DIRTY_CHUNK
* 8;
2853 bs
->dirty_bitmap
= qemu_mallocz(bitmap_size
);
2856 if (bs
->dirty_bitmap
) {
2857 qemu_free(bs
->dirty_bitmap
);
2858 bs
->dirty_bitmap
= NULL
;
2863 int bdrv_get_dirty(BlockDriverState
*bs
, int64_t sector
)
2865 int64_t chunk
= sector
/ (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK
;
2867 if (bs
->dirty_bitmap
&&
2868 (sector
<< BDRV_SECTOR_BITS
) < bdrv_getlength(bs
)) {
2869 return !!(bs
->dirty_bitmap
[chunk
/ (sizeof(unsigned long) * 8)] &
2870 (1UL << (chunk
% (sizeof(unsigned long) * 8))));
2876 void bdrv_reset_dirty(BlockDriverState
*bs
, int64_t cur_sector
,
2879 set_dirty_bitmap(bs
, cur_sector
, nr_sectors
, 0);
2882 int64_t bdrv_get_dirty_count(BlockDriverState
*bs
)
2884 return bs
->dirty_count
;
2887 void bdrv_set_in_use(BlockDriverState
*bs
, int in_use
)
2889 assert(bs
->in_use
!= in_use
);
2890 bs
->in_use
= in_use
;
2893 int bdrv_in_use(BlockDriverState
*bs
)
2898 int bdrv_img_create(const char *filename
, const char *fmt
,
2899 const char *base_filename
, const char *base_fmt
,
2900 char *options
, uint64_t img_size
, int flags
)
2902 QEMUOptionParameter
*param
= NULL
, *create_options
= NULL
;
2903 QEMUOptionParameter
*backing_fmt
, *backing_file
, *size
;
2904 BlockDriverState
*bs
= NULL
;
2905 BlockDriver
*drv
, *proto_drv
;
2906 BlockDriver
*backing_drv
= NULL
;
2909 /* Find driver and parse its options */
2910 drv
= bdrv_find_format(fmt
);
2912 error_report("Unknown file format '%s'", fmt
);
2917 proto_drv
= bdrv_find_protocol(filename
);
2919 error_report("Unknown protocol '%s'", filename
);
2924 create_options
= append_option_parameters(create_options
,
2925 drv
->create_options
);
2926 create_options
= append_option_parameters(create_options
,
2927 proto_drv
->create_options
);
2929 /* Create parameter list with default values */
2930 param
= parse_option_parameters("", create_options
, param
);
2932 set_option_parameter_int(param
, BLOCK_OPT_SIZE
, img_size
);
2934 /* Parse -o options */
2936 param
= parse_option_parameters(options
, create_options
, param
);
2937 if (param
== NULL
) {
2938 error_report("Invalid options for file format '%s'.", fmt
);
2944 if (base_filename
) {
2945 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FILE
,
2947 error_report("Backing file not supported for file format '%s'",
2955 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FMT
, base_fmt
)) {
2956 error_report("Backing file format not supported for file "
2957 "format '%s'", fmt
);
2963 backing_file
= get_option_parameter(param
, BLOCK_OPT_BACKING_FILE
);
2964 if (backing_file
&& backing_file
->value
.s
) {
2965 if (!strcmp(filename
, backing_file
->value
.s
)) {
2966 error_report("Error: Trying to create an image with the "
2967 "same filename as the backing file");
2973 backing_fmt
= get_option_parameter(param
, BLOCK_OPT_BACKING_FMT
);
2974 if (backing_fmt
&& backing_fmt
->value
.s
) {
2975 backing_drv
= bdrv_find_format(backing_fmt
->value
.s
);
2977 error_report("Unknown backing file format '%s'",
2978 backing_fmt
->value
.s
);
2984 // The size for the image must always be specified, with one exception:
2985 // If we are using a backing file, we can obtain the size from there
2986 size
= get_option_parameter(param
, BLOCK_OPT_SIZE
);
2987 if (size
&& size
->value
.n
== -1) {
2988 if (backing_file
&& backing_file
->value
.s
) {
2994 ret
= bdrv_open(bs
, backing_file
->value
.s
, flags
, backing_drv
);
2996 error_report("Could not open '%s'", backing_file
->value
.s
);
2999 bdrv_get_geometry(bs
, &size
);
3002 snprintf(buf
, sizeof(buf
), "%" PRId64
, size
);
3003 set_option_parameter(param
, BLOCK_OPT_SIZE
, buf
);
3005 error_report("Image creation needs a size parameter");
3011 printf("Formatting '%s', fmt=%s ", filename
, fmt
);
3012 print_option_parameters(param
);
3015 ret
= bdrv_create(drv
, filename
, param
);
3018 if (ret
== -ENOTSUP
) {
3019 error_report("Formatting or formatting option not supported for "
3020 "file format '%s'", fmt
);
3021 } else if (ret
== -EFBIG
) {
3022 error_report("The image size is too large for file format '%s'",
3025 error_report("%s: error while creating %s: %s", filename
, fmt
,
3031 free_option_parameters(create_options
);
3032 free_option_parameters(param
);