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"
31 #include "qemu-coroutine.h"
32 #include "qmp-commands.h"
33 #include "qemu-timer.h"
36 #include <sys/types.h>
38 #include <sys/ioctl.h>
39 #include <sys/queue.h>
49 #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
51 static void bdrv_dev_change_media_cb(BlockDriverState
*bs
, bool load
);
52 static BlockDriverAIOCB
*bdrv_aio_readv_em(BlockDriverState
*bs
,
53 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
54 BlockDriverCompletionFunc
*cb
, void *opaque
);
55 static BlockDriverAIOCB
*bdrv_aio_writev_em(BlockDriverState
*bs
,
56 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
57 BlockDriverCompletionFunc
*cb
, void *opaque
);
58 static int coroutine_fn
bdrv_co_readv_em(BlockDriverState
*bs
,
59 int64_t sector_num
, int nb_sectors
,
61 static int coroutine_fn
bdrv_co_writev_em(BlockDriverState
*bs
,
62 int64_t sector_num
, int nb_sectors
,
64 static int coroutine_fn
bdrv_co_do_readv(BlockDriverState
*bs
,
65 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
66 static int coroutine_fn
bdrv_co_do_writev(BlockDriverState
*bs
,
67 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
68 static BlockDriverAIOCB
*bdrv_co_aio_rw_vector(BlockDriverState
*bs
,
72 BlockDriverCompletionFunc
*cb
,
75 static void coroutine_fn
bdrv_co_do_rw(void *opaque
);
77 static bool bdrv_exceed_bps_limits(BlockDriverState
*bs
, int nb_sectors
,
78 bool is_write
, double elapsed_time
, uint64_t *wait
);
79 static bool bdrv_exceed_iops_limits(BlockDriverState
*bs
, bool is_write
,
80 double elapsed_time
, uint64_t *wait
);
81 static bool bdrv_exceed_io_limits(BlockDriverState
*bs
, int nb_sectors
,
82 bool is_write
, int64_t *wait
);
84 static QTAILQ_HEAD(, BlockDriverState
) bdrv_states
=
85 QTAILQ_HEAD_INITIALIZER(bdrv_states
);
87 static QLIST_HEAD(, BlockDriver
) bdrv_drivers
=
88 QLIST_HEAD_INITIALIZER(bdrv_drivers
);
90 /* The device to use for VM snapshots */
91 static BlockDriverState
*bs_snapshots
;
93 /* If non-zero, use only whitelisted block drivers */
94 static int use_bdrv_whitelist
;
97 static int is_windows_drive_prefix(const char *filename
)
99 return (((filename
[0] >= 'a' && filename
[0] <= 'z') ||
100 (filename
[0] >= 'A' && filename
[0] <= 'Z')) &&
104 int is_windows_drive(const char *filename
)
106 if (is_windows_drive_prefix(filename
) &&
109 if (strstart(filename
, "\\\\.\\", NULL
) ||
110 strstart(filename
, "//./", NULL
))
116 /* throttling disk I/O limits */
117 void bdrv_io_limits_disable(BlockDriverState
*bs
)
119 bs
->io_limits_enabled
= false;
121 while (qemu_co_queue_next(&bs
->throttled_reqs
));
123 if (bs
->block_timer
) {
124 qemu_del_timer(bs
->block_timer
);
125 qemu_free_timer(bs
->block_timer
);
126 bs
->block_timer
= NULL
;
132 memset(&bs
->io_base
, 0, sizeof(bs
->io_base
));
135 static void bdrv_block_timer(void *opaque
)
137 BlockDriverState
*bs
= opaque
;
139 qemu_co_queue_next(&bs
->throttled_reqs
);
142 void bdrv_io_limits_enable(BlockDriverState
*bs
)
144 qemu_co_queue_init(&bs
->throttled_reqs
);
145 bs
->block_timer
= qemu_new_timer_ns(vm_clock
, bdrv_block_timer
, bs
);
146 bs
->slice_time
= 5 * BLOCK_IO_SLICE_TIME
;
147 bs
->slice_start
= qemu_get_clock_ns(vm_clock
);
148 bs
->slice_end
= bs
->slice_start
+ bs
->slice_time
;
149 memset(&bs
->io_base
, 0, sizeof(bs
->io_base
));
150 bs
->io_limits_enabled
= true;
153 bool bdrv_io_limits_enabled(BlockDriverState
*bs
)
155 BlockIOLimit
*io_limits
= &bs
->io_limits
;
156 return io_limits
->bps
[BLOCK_IO_LIMIT_READ
]
157 || io_limits
->bps
[BLOCK_IO_LIMIT_WRITE
]
158 || io_limits
->bps
[BLOCK_IO_LIMIT_TOTAL
]
159 || io_limits
->iops
[BLOCK_IO_LIMIT_READ
]
160 || io_limits
->iops
[BLOCK_IO_LIMIT_WRITE
]
161 || io_limits
->iops
[BLOCK_IO_LIMIT_TOTAL
];
164 static void bdrv_io_limits_intercept(BlockDriverState
*bs
,
165 bool is_write
, int nb_sectors
)
167 int64_t wait_time
= -1;
169 if (!qemu_co_queue_empty(&bs
->throttled_reqs
)) {
170 qemu_co_queue_wait(&bs
->throttled_reqs
);
173 /* In fact, we hope to keep each request's timing, in FIFO mode. The next
174 * throttled requests will not be dequeued until the current request is
175 * allowed to be serviced. So if the current request still exceeds the
176 * limits, it will be inserted to the head. All requests followed it will
177 * be still in throttled_reqs queue.
180 while (bdrv_exceed_io_limits(bs
, nb_sectors
, is_write
, &wait_time
)) {
181 qemu_mod_timer(bs
->block_timer
,
182 wait_time
+ qemu_get_clock_ns(vm_clock
));
183 qemu_co_queue_wait_insert_head(&bs
->throttled_reqs
);
186 qemu_co_queue_next(&bs
->throttled_reqs
);
189 /* check if the path starts with "<protocol>:" */
190 static int path_has_protocol(const char *path
)
193 if (is_windows_drive(path
) ||
194 is_windows_drive_prefix(path
)) {
199 return strchr(path
, ':') != NULL
;
202 int path_is_absolute(const char *path
)
206 /* specific case for names like: "\\.\d:" */
207 if (*path
== '/' || *path
== '\\')
210 p
= strchr(path
, ':');
216 return (*p
== '/' || *p
== '\\');
222 /* if filename is absolute, just copy it to dest. Otherwise, build a
223 path to it by considering it is relative to base_path. URL are
225 void path_combine(char *dest
, int dest_size
,
226 const char *base_path
,
227 const char *filename
)
234 if (path_is_absolute(filename
)) {
235 pstrcpy(dest
, dest_size
, filename
);
237 p
= strchr(base_path
, ':');
242 p1
= strrchr(base_path
, '/');
246 p2
= strrchr(base_path
, '\\');
258 if (len
> dest_size
- 1)
260 memcpy(dest
, base_path
, len
);
262 pstrcat(dest
, dest_size
, filename
);
266 void bdrv_register(BlockDriver
*bdrv
)
268 /* Block drivers without coroutine functions need emulation */
269 if (!bdrv
->bdrv_co_readv
) {
270 bdrv
->bdrv_co_readv
= bdrv_co_readv_em
;
271 bdrv
->bdrv_co_writev
= bdrv_co_writev_em
;
273 /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if
274 * the block driver lacks aio we need to emulate that too.
276 if (!bdrv
->bdrv_aio_readv
) {
277 /* add AIO emulation layer */
278 bdrv
->bdrv_aio_readv
= bdrv_aio_readv_em
;
279 bdrv
->bdrv_aio_writev
= bdrv_aio_writev_em
;
283 QLIST_INSERT_HEAD(&bdrv_drivers
, bdrv
, list
);
286 /* create a new block device (by default it is empty) */
287 BlockDriverState
*bdrv_new(const char *device_name
)
289 BlockDriverState
*bs
;
291 bs
= g_malloc0(sizeof(BlockDriverState
));
292 pstrcpy(bs
->device_name
, sizeof(bs
->device_name
), device_name
);
293 if (device_name
[0] != '\0') {
294 QTAILQ_INSERT_TAIL(&bdrv_states
, bs
, list
);
296 bdrv_iostatus_disable(bs
);
300 BlockDriver
*bdrv_find_format(const char *format_name
)
303 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
304 if (!strcmp(drv1
->format_name
, format_name
)) {
311 static int bdrv_is_whitelisted(BlockDriver
*drv
)
313 static const char *whitelist
[] = {
314 CONFIG_BDRV_WHITELIST
319 return 1; /* no whitelist, anything goes */
321 for (p
= whitelist
; *p
; p
++) {
322 if (!strcmp(drv
->format_name
, *p
)) {
329 BlockDriver
*bdrv_find_whitelisted_format(const char *format_name
)
331 BlockDriver
*drv
= bdrv_find_format(format_name
);
332 return drv
&& bdrv_is_whitelisted(drv
) ? drv
: NULL
;
335 int bdrv_create(BlockDriver
*drv
, const char* filename
,
336 QEMUOptionParameter
*options
)
338 if (!drv
->bdrv_create
)
341 return drv
->bdrv_create(filename
, options
);
344 int bdrv_create_file(const char* filename
, QEMUOptionParameter
*options
)
348 drv
= bdrv_find_protocol(filename
);
353 return bdrv_create(drv
, filename
, options
);
357 void get_tmp_filename(char *filename
, int size
)
359 char temp_dir
[MAX_PATH
];
361 GetTempPath(MAX_PATH
, temp_dir
);
362 GetTempFileName(temp_dir
, "qem", 0, filename
);
365 void get_tmp_filename(char *filename
, int size
)
369 /* XXX: race condition possible */
370 tmpdir
= getenv("TMPDIR");
373 snprintf(filename
, size
, "%s/vl.XXXXXX", tmpdir
);
374 fd
= mkstemp(filename
);
380 * Detect host devices. By convention, /dev/cdrom[N] is always
381 * recognized as a host CDROM.
383 static BlockDriver
*find_hdev_driver(const char *filename
)
385 int score_max
= 0, score
;
386 BlockDriver
*drv
= NULL
, *d
;
388 QLIST_FOREACH(d
, &bdrv_drivers
, list
) {
389 if (d
->bdrv_probe_device
) {
390 score
= d
->bdrv_probe_device(filename
);
391 if (score
> score_max
) {
401 BlockDriver
*bdrv_find_protocol(const char *filename
)
408 /* TODO Drivers without bdrv_file_open must be specified explicitly */
411 * XXX(hch): we really should not let host device detection
412 * override an explicit protocol specification, but moving this
413 * later breaks access to device names with colons in them.
414 * Thanks to the brain-dead persistent naming schemes on udev-
415 * based Linux systems those actually are quite common.
417 drv1
= find_hdev_driver(filename
);
422 if (!path_has_protocol(filename
)) {
423 return bdrv_find_format("file");
425 p
= strchr(filename
, ':');
428 if (len
> sizeof(protocol
) - 1)
429 len
= sizeof(protocol
) - 1;
430 memcpy(protocol
, filename
, len
);
431 protocol
[len
] = '\0';
432 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
433 if (drv1
->protocol_name
&&
434 !strcmp(drv1
->protocol_name
, protocol
)) {
441 static int find_image_format(const char *filename
, BlockDriver
**pdrv
)
443 int ret
, score
, score_max
;
444 BlockDriver
*drv1
, *drv
;
446 BlockDriverState
*bs
;
448 ret
= bdrv_file_open(&bs
, filename
, 0);
454 /* Return the raw BlockDriver * to scsi-generic devices or empty drives */
455 if (bs
->sg
|| !bdrv_is_inserted(bs
)) {
457 drv
= bdrv_find_format("raw");
465 ret
= bdrv_pread(bs
, 0, buf
, sizeof(buf
));
474 QLIST_FOREACH(drv1
, &bdrv_drivers
, list
) {
475 if (drv1
->bdrv_probe
) {
476 score
= drv1
->bdrv_probe(buf
, ret
, filename
);
477 if (score
> score_max
) {
491 * Set the current 'total_sectors' value
493 static int refresh_total_sectors(BlockDriverState
*bs
, int64_t hint
)
495 BlockDriver
*drv
= bs
->drv
;
497 /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
501 /* query actual device if possible, otherwise just trust the hint */
502 if (drv
->bdrv_getlength
) {
503 int64_t length
= drv
->bdrv_getlength(bs
);
507 hint
= length
>> BDRV_SECTOR_BITS
;
510 bs
->total_sectors
= hint
;
515 * Set open flags for a given cache mode
517 * Return 0 on success, -1 if the cache mode was invalid.
519 int bdrv_parse_cache_flags(const char *mode
, int *flags
)
521 *flags
&= ~BDRV_O_CACHE_MASK
;
523 if (!strcmp(mode
, "off") || !strcmp(mode
, "none")) {
524 *flags
|= BDRV_O_NOCACHE
| BDRV_O_CACHE_WB
;
525 } else if (!strcmp(mode
, "directsync")) {
526 *flags
|= BDRV_O_NOCACHE
;
527 } else if (!strcmp(mode
, "writeback")) {
528 *flags
|= BDRV_O_CACHE_WB
;
529 } else if (!strcmp(mode
, "unsafe")) {
530 *flags
|= BDRV_O_CACHE_WB
;
531 *flags
|= BDRV_O_NO_FLUSH
;
532 } else if (!strcmp(mode
, "writethrough")) {
533 /* this is the default */
542 * Common part for opening disk images and files
544 static int bdrv_open_common(BlockDriverState
*bs
, const char *filename
,
545 int flags
, BlockDriver
*drv
)
551 trace_bdrv_open_common(bs
, filename
, flags
, drv
->format_name
);
554 bs
->total_sectors
= 0;
558 bs
->open_flags
= flags
;
560 bs
->buffer_alignment
= 512;
562 pstrcpy(bs
->filename
, sizeof(bs
->filename
), filename
);
563 bs
->backing_file
[0] = '\0';
565 if (use_bdrv_whitelist
&& !bdrv_is_whitelisted(drv
)) {
570 bs
->opaque
= g_malloc0(drv
->instance_size
);
572 bs
->enable_write_cache
= !!(flags
& BDRV_O_CACHE_WB
);
575 * Clear flags that are internal to the block layer before opening the
578 open_flags
= flags
& ~(BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
581 * Snapshots should be writable.
583 if (bs
->is_temporary
) {
584 open_flags
|= BDRV_O_RDWR
;
587 bs
->keep_read_only
= bs
->read_only
= !(open_flags
& BDRV_O_RDWR
);
589 /* Open the image, either directly or using a protocol */
590 if (drv
->bdrv_file_open
) {
591 ret
= drv
->bdrv_file_open(bs
, filename
, open_flags
);
593 ret
= bdrv_file_open(&bs
->file
, filename
, open_flags
);
595 ret
= drv
->bdrv_open(bs
, open_flags
);
603 ret
= refresh_total_sectors(bs
, bs
->total_sectors
);
609 if (bs
->is_temporary
) {
617 bdrv_delete(bs
->file
);
627 * Opens a file using a protocol (file, host_device, nbd, ...)
629 int bdrv_file_open(BlockDriverState
**pbs
, const char *filename
, int flags
)
631 BlockDriverState
*bs
;
635 drv
= bdrv_find_protocol(filename
);
641 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
652 * Opens a disk image (raw, qcow2, vmdk, ...)
654 int bdrv_open(BlockDriverState
*bs
, const char *filename
, int flags
,
658 char tmp_filename
[PATH_MAX
];
660 if (flags
& BDRV_O_SNAPSHOT
) {
661 BlockDriverState
*bs1
;
664 BlockDriver
*bdrv_qcow2
;
665 QEMUOptionParameter
*options
;
666 char backing_filename
[PATH_MAX
];
668 /* if snapshot, we create a temporary backing file and open it
669 instead of opening 'filename' directly */
671 /* if there is a backing file, use it */
673 ret
= bdrv_open(bs1
, filename
, 0, drv
);
678 total_size
= bdrv_getlength(bs1
) & BDRV_SECTOR_MASK
;
680 if (bs1
->drv
&& bs1
->drv
->protocol_name
)
685 get_tmp_filename(tmp_filename
, sizeof(tmp_filename
));
687 /* Real path is meaningless for protocols */
689 snprintf(backing_filename
, sizeof(backing_filename
),
691 else if (!realpath(filename
, backing_filename
))
694 bdrv_qcow2
= bdrv_find_format("qcow2");
695 options
= parse_option_parameters("", bdrv_qcow2
->create_options
, NULL
);
697 set_option_parameter_int(options
, BLOCK_OPT_SIZE
, total_size
);
698 set_option_parameter(options
, BLOCK_OPT_BACKING_FILE
, backing_filename
);
700 set_option_parameter(options
, BLOCK_OPT_BACKING_FMT
,
704 ret
= bdrv_create(bdrv_qcow2
, tmp_filename
, options
);
705 free_option_parameters(options
);
710 filename
= tmp_filename
;
712 bs
->is_temporary
= 1;
715 /* Find the right image format driver */
717 ret
= find_image_format(filename
, &drv
);
721 goto unlink_and_fail
;
725 ret
= bdrv_open_common(bs
, filename
, flags
, drv
);
727 goto unlink_and_fail
;
730 /* If there is a backing file, use it */
731 if ((flags
& BDRV_O_NO_BACKING
) == 0 && bs
->backing_file
[0] != '\0') {
732 char backing_filename
[PATH_MAX
];
734 BlockDriver
*back_drv
= NULL
;
736 bs
->backing_hd
= bdrv_new("");
738 if (path_has_protocol(bs
->backing_file
)) {
739 pstrcpy(backing_filename
, sizeof(backing_filename
),
742 path_combine(backing_filename
, sizeof(backing_filename
),
743 filename
, bs
->backing_file
);
746 if (bs
->backing_format
[0] != '\0') {
747 back_drv
= bdrv_find_format(bs
->backing_format
);
750 /* backing files always opened read-only */
752 flags
& ~(BDRV_O_RDWR
| BDRV_O_SNAPSHOT
| BDRV_O_NO_BACKING
);
754 ret
= bdrv_open(bs
->backing_hd
, backing_filename
, back_flags
, back_drv
);
759 if (bs
->is_temporary
) {
760 bs
->backing_hd
->keep_read_only
= !(flags
& BDRV_O_RDWR
);
762 /* base image inherits from "parent" */
763 bs
->backing_hd
->keep_read_only
= bs
->keep_read_only
;
767 if (!bdrv_key_required(bs
)) {
768 bdrv_dev_change_media_cb(bs
, true);
771 /* throttling disk I/O limits */
772 if (bs
->io_limits_enabled
) {
773 bdrv_io_limits_enable(bs
);
779 if (bs
->is_temporary
) {
785 void bdrv_close(BlockDriverState
*bs
)
788 if (bs
== bs_snapshots
) {
791 if (bs
->backing_hd
) {
792 bdrv_delete(bs
->backing_hd
);
793 bs
->backing_hd
= NULL
;
795 bs
->drv
->bdrv_close(bs
);
798 if (bs
->is_temporary
) {
799 unlink(bs
->filename
);
805 if (bs
->file
!= NULL
) {
806 bdrv_close(bs
->file
);
809 bdrv_dev_change_media_cb(bs
, false);
812 /*throttling disk I/O limits*/
813 if (bs
->io_limits_enabled
) {
814 bdrv_io_limits_disable(bs
);
818 void bdrv_close_all(void)
820 BlockDriverState
*bs
;
822 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
827 /* make a BlockDriverState anonymous by removing from bdrv_state list.
828 Also, NULL terminate the device_name to prevent double remove */
829 void bdrv_make_anon(BlockDriverState
*bs
)
831 if (bs
->device_name
[0] != '\0') {
832 QTAILQ_REMOVE(&bdrv_states
, bs
, list
);
834 bs
->device_name
[0] = '\0';
837 void bdrv_delete(BlockDriverState
*bs
)
841 /* remove from list, if necessary */
845 if (bs
->file
!= NULL
) {
846 bdrv_delete(bs
->file
);
849 assert(bs
!= bs_snapshots
);
853 int bdrv_attach_dev(BlockDriverState
*bs
, void *dev
)
854 /* TODO change to DeviceState *dev when all users are qdevified */
860 bdrv_iostatus_reset(bs
);
864 /* TODO qdevified devices don't use this, remove when devices are qdevified */
865 void bdrv_attach_dev_nofail(BlockDriverState
*bs
, void *dev
)
867 if (bdrv_attach_dev(bs
, dev
) < 0) {
872 void bdrv_detach_dev(BlockDriverState
*bs
, void *dev
)
873 /* TODO change to DeviceState *dev when all users are qdevified */
875 assert(bs
->dev
== dev
);
878 bs
->dev_opaque
= NULL
;
879 bs
->buffer_alignment
= 512;
882 /* TODO change to return DeviceState * when all users are qdevified */
883 void *bdrv_get_attached_dev(BlockDriverState
*bs
)
888 void bdrv_set_dev_ops(BlockDriverState
*bs
, const BlockDevOps
*ops
,
892 bs
->dev_opaque
= opaque
;
893 if (bdrv_dev_has_removable_media(bs
) && bs
== bs_snapshots
) {
898 static void bdrv_dev_change_media_cb(BlockDriverState
*bs
, bool load
)
900 if (bs
->dev_ops
&& bs
->dev_ops
->change_media_cb
) {
901 bs
->dev_ops
->change_media_cb(bs
->dev_opaque
, load
);
905 bool bdrv_dev_has_removable_media(BlockDriverState
*bs
)
907 return !bs
->dev
|| (bs
->dev_ops
&& bs
->dev_ops
->change_media_cb
);
910 void bdrv_dev_eject_request(BlockDriverState
*bs
, bool force
)
912 if (bs
->dev_ops
&& bs
->dev_ops
->eject_request_cb
) {
913 bs
->dev_ops
->eject_request_cb(bs
->dev_opaque
, force
);
917 bool bdrv_dev_is_tray_open(BlockDriverState
*bs
)
919 if (bs
->dev_ops
&& bs
->dev_ops
->is_tray_open
) {
920 return bs
->dev_ops
->is_tray_open(bs
->dev_opaque
);
925 static void bdrv_dev_resize_cb(BlockDriverState
*bs
)
927 if (bs
->dev_ops
&& bs
->dev_ops
->resize_cb
) {
928 bs
->dev_ops
->resize_cb(bs
->dev_opaque
);
932 bool bdrv_dev_is_medium_locked(BlockDriverState
*bs
)
934 if (bs
->dev_ops
&& bs
->dev_ops
->is_medium_locked
) {
935 return bs
->dev_ops
->is_medium_locked(bs
->dev_opaque
);
941 * Run consistency checks on an image
943 * Returns 0 if the check could be completed (it doesn't mean that the image is
944 * free of errors) or -errno when an internal error occurred. The results of the
945 * check are stored in res.
947 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
)
949 if (bs
->drv
->bdrv_check
== NULL
) {
953 memset(res
, 0, sizeof(*res
));
954 return bs
->drv
->bdrv_check(bs
, res
);
957 #define COMMIT_BUF_SECTORS 2048
959 /* commit COW file into the raw image */
960 int bdrv_commit(BlockDriverState
*bs
)
962 BlockDriver
*drv
= bs
->drv
;
963 BlockDriver
*backing_drv
;
964 int64_t sector
, total_sectors
;
965 int n
, ro
, open_flags
;
966 int ret
= 0, rw_ret
= 0;
969 BlockDriverState
*bs_rw
, *bs_ro
;
974 if (!bs
->backing_hd
) {
978 if (bs
->backing_hd
->keep_read_only
) {
982 backing_drv
= bs
->backing_hd
->drv
;
983 ro
= bs
->backing_hd
->read_only
;
984 strncpy(filename
, bs
->backing_hd
->filename
, sizeof(filename
));
985 open_flags
= bs
->backing_hd
->open_flags
;
989 bdrv_delete(bs
->backing_hd
);
990 bs
->backing_hd
= NULL
;
991 bs_rw
= bdrv_new("");
992 rw_ret
= bdrv_open(bs_rw
, filename
, open_flags
| BDRV_O_RDWR
,
996 /* try to re-open read-only */
997 bs_ro
= bdrv_new("");
998 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
1002 /* drive not functional anymore */
1006 bs
->backing_hd
= bs_ro
;
1009 bs
->backing_hd
= bs_rw
;
1012 total_sectors
= bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
;
1013 buf
= g_malloc(COMMIT_BUF_SECTORS
* BDRV_SECTOR_SIZE
);
1015 for (sector
= 0; sector
< total_sectors
; sector
+= n
) {
1016 if (bdrv_is_allocated(bs
, sector
, COMMIT_BUF_SECTORS
, &n
)) {
1018 if (bdrv_read(bs
, sector
, buf
, n
) != 0) {
1023 if (bdrv_write(bs
->backing_hd
, sector
, buf
, n
) != 0) {
1030 if (drv
->bdrv_make_empty
) {
1031 ret
= drv
->bdrv_make_empty(bs
);
1036 * Make sure all data we wrote to the backing device is actually
1040 bdrv_flush(bs
->backing_hd
);
1047 bdrv_delete(bs
->backing_hd
);
1048 bs
->backing_hd
= NULL
;
1049 bs_ro
= bdrv_new("");
1050 ret
= bdrv_open(bs_ro
, filename
, open_flags
& ~BDRV_O_RDWR
,
1054 /* drive not functional anymore */
1058 bs
->backing_hd
= bs_ro
;
1059 bs
->backing_hd
->keep_read_only
= 0;
1065 void bdrv_commit_all(void)
1067 BlockDriverState
*bs
;
1069 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1077 * -EINVAL - backing format specified, but no file
1078 * -ENOSPC - can't update the backing file because no space is left in the
1080 * -ENOTSUP - format driver doesn't support changing the backing file
1082 int bdrv_change_backing_file(BlockDriverState
*bs
,
1083 const char *backing_file
, const char *backing_fmt
)
1085 BlockDriver
*drv
= bs
->drv
;
1087 if (drv
->bdrv_change_backing_file
!= NULL
) {
1088 return drv
->bdrv_change_backing_file(bs
, backing_file
, backing_fmt
);
1094 static int bdrv_check_byte_request(BlockDriverState
*bs
, int64_t offset
,
1099 if (!bdrv_is_inserted(bs
))
1105 len
= bdrv_getlength(bs
);
1110 if ((offset
> len
) || (len
- offset
< size
))
1116 static int bdrv_check_request(BlockDriverState
*bs
, int64_t sector_num
,
1119 return bdrv_check_byte_request(bs
, sector_num
* BDRV_SECTOR_SIZE
,
1120 nb_sectors
* BDRV_SECTOR_SIZE
);
1123 typedef struct RwCo
{
1124 BlockDriverState
*bs
;
1132 static void coroutine_fn
bdrv_rw_co_entry(void *opaque
)
1134 RwCo
*rwco
= opaque
;
1136 if (!rwco
->is_write
) {
1137 rwco
->ret
= bdrv_co_do_readv(rwco
->bs
, rwco
->sector_num
,
1138 rwco
->nb_sectors
, rwco
->qiov
);
1140 rwco
->ret
= bdrv_co_do_writev(rwco
->bs
, rwco
->sector_num
,
1141 rwco
->nb_sectors
, rwco
->qiov
);
1146 * Process a synchronous request using coroutines
1148 static int bdrv_rw_co(BlockDriverState
*bs
, int64_t sector_num
, uint8_t *buf
,
1149 int nb_sectors
, bool is_write
)
1152 struct iovec iov
= {
1153 .iov_base
= (void *)buf
,
1154 .iov_len
= nb_sectors
* BDRV_SECTOR_SIZE
,
1159 .sector_num
= sector_num
,
1160 .nb_sectors
= nb_sectors
,
1162 .is_write
= is_write
,
1166 qemu_iovec_init_external(&qiov
, &iov
, 1);
1168 if (qemu_in_coroutine()) {
1169 /* Fast-path if already in coroutine context */
1170 bdrv_rw_co_entry(&rwco
);
1172 co
= qemu_coroutine_create(bdrv_rw_co_entry
);
1173 qemu_coroutine_enter(co
, &rwco
);
1174 while (rwco
.ret
== NOT_DONE
) {
1181 /* return < 0 if error. See bdrv_write() for the return codes */
1182 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
1183 uint8_t *buf
, int nb_sectors
)
1185 return bdrv_rw_co(bs
, sector_num
, buf
, nb_sectors
, false);
1188 static void set_dirty_bitmap(BlockDriverState
*bs
, int64_t sector_num
,
1189 int nb_sectors
, int dirty
)
1192 unsigned long val
, idx
, bit
;
1194 start
= sector_num
/ BDRV_SECTORS_PER_DIRTY_CHUNK
;
1195 end
= (sector_num
+ nb_sectors
- 1) / BDRV_SECTORS_PER_DIRTY_CHUNK
;
1197 for (; start
<= end
; start
++) {
1198 idx
= start
/ (sizeof(unsigned long) * 8);
1199 bit
= start
% (sizeof(unsigned long) * 8);
1200 val
= bs
->dirty_bitmap
[idx
];
1202 if (!(val
& (1UL << bit
))) {
1207 if (val
& (1UL << bit
)) {
1209 val
&= ~(1UL << bit
);
1212 bs
->dirty_bitmap
[idx
] = val
;
1216 /* Return < 0 if error. Important errors are:
1217 -EIO generic I/O error (may happen for all errors)
1218 -ENOMEDIUM No media inserted.
1219 -EINVAL Invalid sector number or nb_sectors
1220 -EACCES Trying to write a read-only device
1222 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
1223 const uint8_t *buf
, int nb_sectors
)
1225 return bdrv_rw_co(bs
, sector_num
, (uint8_t *)buf
, nb_sectors
, true);
1228 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
1229 void *buf
, int count1
)
1231 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
1232 int len
, nb_sectors
, count
;
1237 /* first read to align to sector start */
1238 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1241 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1243 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1245 memcpy(buf
, tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), len
);
1253 /* read the sectors "in place" */
1254 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1255 if (nb_sectors
> 0) {
1256 if ((ret
= bdrv_read(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1258 sector_num
+= nb_sectors
;
1259 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1264 /* add data from the last sector */
1266 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1268 memcpy(buf
, tmp_buf
, count
);
1273 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
1274 const void *buf
, int count1
)
1276 uint8_t tmp_buf
[BDRV_SECTOR_SIZE
];
1277 int len
, nb_sectors
, count
;
1282 /* first write to align to sector start */
1283 len
= (BDRV_SECTOR_SIZE
- offset
) & (BDRV_SECTOR_SIZE
- 1);
1286 sector_num
= offset
>> BDRV_SECTOR_BITS
;
1288 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1290 memcpy(tmp_buf
+ (offset
& (BDRV_SECTOR_SIZE
- 1)), buf
, len
);
1291 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1300 /* write the sectors "in place" */
1301 nb_sectors
= count
>> BDRV_SECTOR_BITS
;
1302 if (nb_sectors
> 0) {
1303 if ((ret
= bdrv_write(bs
, sector_num
, buf
, nb_sectors
)) < 0)
1305 sector_num
+= nb_sectors
;
1306 len
= nb_sectors
<< BDRV_SECTOR_BITS
;
1311 /* add data from the last sector */
1313 if ((ret
= bdrv_read(bs
, sector_num
, tmp_buf
, 1)) < 0)
1315 memcpy(tmp_buf
, buf
, count
);
1316 if ((ret
= bdrv_write(bs
, sector_num
, tmp_buf
, 1)) < 0)
1323 * Writes to the file and ensures that no writes are reordered across this
1324 * request (acts as a barrier)
1326 * Returns 0 on success, -errno in error cases.
1328 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
1329 const void *buf
, int count
)
1333 ret
= bdrv_pwrite(bs
, offset
, buf
, count
);
1338 /* No flush needed for cache modes that use O_DSYNC */
1339 if ((bs
->open_flags
& BDRV_O_CACHE_WB
) != 0) {
1347 * Handle a read request in coroutine context
1349 static int coroutine_fn
bdrv_co_do_readv(BlockDriverState
*bs
,
1350 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
)
1352 BlockDriver
*drv
= bs
->drv
;
1357 if (bdrv_check_request(bs
, sector_num
, nb_sectors
)) {
1361 /* throttling disk read I/O */
1362 if (bs
->io_limits_enabled
) {
1363 bdrv_io_limits_intercept(bs
, false, nb_sectors
);
1366 return drv
->bdrv_co_readv(bs
, sector_num
, nb_sectors
, qiov
);
1369 int coroutine_fn
bdrv_co_readv(BlockDriverState
*bs
, int64_t sector_num
,
1370 int nb_sectors
, QEMUIOVector
*qiov
)
1372 trace_bdrv_co_readv(bs
, sector_num
, nb_sectors
);
1374 return bdrv_co_do_readv(bs
, sector_num
, nb_sectors
, qiov
);
1378 * Handle a write request in coroutine context
1380 static int coroutine_fn
bdrv_co_do_writev(BlockDriverState
*bs
,
1381 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
)
1383 BlockDriver
*drv
= bs
->drv
;
1389 if (bs
->read_only
) {
1392 if (bdrv_check_request(bs
, sector_num
, nb_sectors
)) {
1396 /* throttling disk write I/O */
1397 if (bs
->io_limits_enabled
) {
1398 bdrv_io_limits_intercept(bs
, true, nb_sectors
);
1401 ret
= drv
->bdrv_co_writev(bs
, sector_num
, nb_sectors
, qiov
);
1403 if (bs
->dirty_bitmap
) {
1404 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
1407 if (bs
->wr_highest_sector
< sector_num
+ nb_sectors
- 1) {
1408 bs
->wr_highest_sector
= sector_num
+ nb_sectors
- 1;
1414 int coroutine_fn
bdrv_co_writev(BlockDriverState
*bs
, int64_t sector_num
,
1415 int nb_sectors
, QEMUIOVector
*qiov
)
1417 trace_bdrv_co_writev(bs
, sector_num
, nb_sectors
);
1419 return bdrv_co_do_writev(bs
, sector_num
, nb_sectors
, qiov
);
1423 * Truncate file to 'offset' bytes (needed only for file protocols)
1425 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
)
1427 BlockDriver
*drv
= bs
->drv
;
1431 if (!drv
->bdrv_truncate
)
1435 if (bdrv_in_use(bs
))
1437 ret
= drv
->bdrv_truncate(bs
, offset
);
1439 ret
= refresh_total_sectors(bs
, offset
>> BDRV_SECTOR_BITS
);
1440 bdrv_dev_resize_cb(bs
);
1446 * Length of a allocated file in bytes. Sparse files are counted by actual
1447 * allocated space. Return < 0 if error or unknown.
1449 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
)
1451 BlockDriver
*drv
= bs
->drv
;
1455 if (drv
->bdrv_get_allocated_file_size
) {
1456 return drv
->bdrv_get_allocated_file_size(bs
);
1459 return bdrv_get_allocated_file_size(bs
->file
);
1465 * Length of a file in bytes. Return < 0 if error or unknown.
1467 int64_t bdrv_getlength(BlockDriverState
*bs
)
1469 BlockDriver
*drv
= bs
->drv
;
1473 if (bs
->growable
|| bdrv_dev_has_removable_media(bs
)) {
1474 if (drv
->bdrv_getlength
) {
1475 return drv
->bdrv_getlength(bs
);
1478 return bs
->total_sectors
* BDRV_SECTOR_SIZE
;
1481 /* return 0 as number of sectors if no device present or error */
1482 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
)
1485 length
= bdrv_getlength(bs
);
1489 length
= length
>> BDRV_SECTOR_BITS
;
1490 *nb_sectors_ptr
= length
;
1494 uint8_t boot_ind
; /* 0x80 - active */
1495 uint8_t head
; /* starting head */
1496 uint8_t sector
; /* starting sector */
1497 uint8_t cyl
; /* starting cylinder */
1498 uint8_t sys_ind
; /* What partition type */
1499 uint8_t end_head
; /* end head */
1500 uint8_t end_sector
; /* end sector */
1501 uint8_t end_cyl
; /* end cylinder */
1502 uint32_t start_sect
; /* starting sector counting from 0 */
1503 uint32_t nr_sects
; /* nr of sectors in partition */
1506 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1507 static int guess_disk_lchs(BlockDriverState
*bs
,
1508 int *pcylinders
, int *pheads
, int *psectors
)
1510 uint8_t buf
[BDRV_SECTOR_SIZE
];
1511 int ret
, i
, heads
, sectors
, cylinders
;
1512 struct partition
*p
;
1514 uint64_t nb_sectors
;
1516 bdrv_get_geometry(bs
, &nb_sectors
);
1518 ret
= bdrv_read(bs
, 0, buf
, 1);
1521 /* test msdos magic */
1522 if (buf
[510] != 0x55 || buf
[511] != 0xaa)
1524 for(i
= 0; i
< 4; i
++) {
1525 p
= ((struct partition
*)(buf
+ 0x1be)) + i
;
1526 nr_sects
= le32_to_cpu(p
->nr_sects
);
1527 if (nr_sects
&& p
->end_head
) {
1528 /* We make the assumption that the partition terminates on
1529 a cylinder boundary */
1530 heads
= p
->end_head
+ 1;
1531 sectors
= p
->end_sector
& 63;
1534 cylinders
= nb_sectors
/ (heads
* sectors
);
1535 if (cylinders
< 1 || cylinders
> 16383)
1538 *psectors
= sectors
;
1539 *pcylinders
= cylinders
;
1541 printf("guessed geometry: LCHS=%d %d %d\n",
1542 cylinders
, heads
, sectors
);
1550 void bdrv_guess_geometry(BlockDriverState
*bs
, int *pcyls
, int *pheads
, int *psecs
)
1552 int translation
, lba_detected
= 0;
1553 int cylinders
, heads
, secs
;
1554 uint64_t nb_sectors
;
1556 /* if a geometry hint is available, use it */
1557 bdrv_get_geometry(bs
, &nb_sectors
);
1558 bdrv_get_geometry_hint(bs
, &cylinders
, &heads
, &secs
);
1559 translation
= bdrv_get_translation_hint(bs
);
1560 if (cylinders
!= 0) {
1565 if (guess_disk_lchs(bs
, &cylinders
, &heads
, &secs
) == 0) {
1567 /* if heads > 16, it means that a BIOS LBA
1568 translation was active, so the default
1569 hardware geometry is OK */
1571 goto default_geometry
;
1576 /* disable any translation to be in sync with
1577 the logical geometry */
1578 if (translation
== BIOS_ATA_TRANSLATION_AUTO
) {
1579 bdrv_set_translation_hint(bs
,
1580 BIOS_ATA_TRANSLATION_NONE
);
1585 /* if no geometry, use a standard physical disk geometry */
1586 cylinders
= nb_sectors
/ (16 * 63);
1588 if (cylinders
> 16383)
1590 else if (cylinders
< 2)
1595 if ((lba_detected
== 1) && (translation
== BIOS_ATA_TRANSLATION_AUTO
)) {
1596 if ((*pcyls
* *pheads
) <= 131072) {
1597 bdrv_set_translation_hint(bs
,
1598 BIOS_ATA_TRANSLATION_LARGE
);
1600 bdrv_set_translation_hint(bs
,
1601 BIOS_ATA_TRANSLATION_LBA
);
1605 bdrv_set_geometry_hint(bs
, *pcyls
, *pheads
, *psecs
);
1609 void bdrv_set_geometry_hint(BlockDriverState
*bs
,
1610 int cyls
, int heads
, int secs
)
1617 void bdrv_set_translation_hint(BlockDriverState
*bs
, int translation
)
1619 bs
->translation
= translation
;
1622 void bdrv_get_geometry_hint(BlockDriverState
*bs
,
1623 int *pcyls
, int *pheads
, int *psecs
)
1626 *pheads
= bs
->heads
;
1630 /* throttling disk io limits */
1631 void bdrv_set_io_limits(BlockDriverState
*bs
,
1632 BlockIOLimit
*io_limits
)
1634 bs
->io_limits
= *io_limits
;
1635 bs
->io_limits_enabled
= bdrv_io_limits_enabled(bs
);
1638 /* Recognize floppy formats */
1639 typedef struct FDFormat
{
1646 static const FDFormat fd_formats
[] = {
1647 /* First entry is default format */
1648 /* 1.44 MB 3"1/2 floppy disks */
1649 { FDRIVE_DRV_144
, 18, 80, 1, },
1650 { FDRIVE_DRV_144
, 20, 80, 1, },
1651 { FDRIVE_DRV_144
, 21, 80, 1, },
1652 { FDRIVE_DRV_144
, 21, 82, 1, },
1653 { FDRIVE_DRV_144
, 21, 83, 1, },
1654 { FDRIVE_DRV_144
, 22, 80, 1, },
1655 { FDRIVE_DRV_144
, 23, 80, 1, },
1656 { FDRIVE_DRV_144
, 24, 80, 1, },
1657 /* 2.88 MB 3"1/2 floppy disks */
1658 { FDRIVE_DRV_288
, 36, 80, 1, },
1659 { FDRIVE_DRV_288
, 39, 80, 1, },
1660 { FDRIVE_DRV_288
, 40, 80, 1, },
1661 { FDRIVE_DRV_288
, 44, 80, 1, },
1662 { FDRIVE_DRV_288
, 48, 80, 1, },
1663 /* 720 kB 3"1/2 floppy disks */
1664 { FDRIVE_DRV_144
, 9, 80, 1, },
1665 { FDRIVE_DRV_144
, 10, 80, 1, },
1666 { FDRIVE_DRV_144
, 10, 82, 1, },
1667 { FDRIVE_DRV_144
, 10, 83, 1, },
1668 { FDRIVE_DRV_144
, 13, 80, 1, },
1669 { FDRIVE_DRV_144
, 14, 80, 1, },
1670 /* 1.2 MB 5"1/4 floppy disks */
1671 { FDRIVE_DRV_120
, 15, 80, 1, },
1672 { FDRIVE_DRV_120
, 18, 80, 1, },
1673 { FDRIVE_DRV_120
, 18, 82, 1, },
1674 { FDRIVE_DRV_120
, 18, 83, 1, },
1675 { FDRIVE_DRV_120
, 20, 80, 1, },
1676 /* 720 kB 5"1/4 floppy disks */
1677 { FDRIVE_DRV_120
, 9, 80, 1, },
1678 { FDRIVE_DRV_120
, 11, 80, 1, },
1679 /* 360 kB 5"1/4 floppy disks */
1680 { FDRIVE_DRV_120
, 9, 40, 1, },
1681 { FDRIVE_DRV_120
, 9, 40, 0, },
1682 { FDRIVE_DRV_120
, 10, 41, 1, },
1683 { FDRIVE_DRV_120
, 10, 42, 1, },
1684 /* 320 kB 5"1/4 floppy disks */
1685 { FDRIVE_DRV_120
, 8, 40, 1, },
1686 { FDRIVE_DRV_120
, 8, 40, 0, },
1687 /* 360 kB must match 5"1/4 better than 3"1/2... */
1688 { FDRIVE_DRV_144
, 9, 80, 0, },
1690 { FDRIVE_DRV_NONE
, -1, -1, 0, },
1693 void bdrv_get_floppy_geometry_hint(BlockDriverState
*bs
, int *nb_heads
,
1694 int *max_track
, int *last_sect
,
1695 FDriveType drive_in
, FDriveType
*drive
)
1697 const FDFormat
*parse
;
1698 uint64_t nb_sectors
, size
;
1699 int i
, first_match
, match
;
1701 bdrv_get_geometry_hint(bs
, nb_heads
, max_track
, last_sect
);
1702 if (*nb_heads
!= 0 && *max_track
!= 0 && *last_sect
!= 0) {
1703 /* User defined disk */
1705 bdrv_get_geometry(bs
, &nb_sectors
);
1708 for (i
= 0; ; i
++) {
1709 parse
= &fd_formats
[i
];
1710 if (parse
->drive
== FDRIVE_DRV_NONE
) {
1713 if (drive_in
== parse
->drive
||
1714 drive_in
== FDRIVE_DRV_NONE
) {
1715 size
= (parse
->max_head
+ 1) * parse
->max_track
*
1717 if (nb_sectors
== size
) {
1721 if (first_match
== -1) {
1727 if (first_match
== -1) {
1730 match
= first_match
;
1732 parse
= &fd_formats
[match
];
1734 *nb_heads
= parse
->max_head
+ 1;
1735 *max_track
= parse
->max_track
;
1736 *last_sect
= parse
->last_sect
;
1737 *drive
= parse
->drive
;
1741 int bdrv_get_translation_hint(BlockDriverState
*bs
)
1743 return bs
->translation
;
1746 void bdrv_set_on_error(BlockDriverState
*bs
, BlockErrorAction on_read_error
,
1747 BlockErrorAction on_write_error
)
1749 bs
->on_read_error
= on_read_error
;
1750 bs
->on_write_error
= on_write_error
;
1753 BlockErrorAction
bdrv_get_on_error(BlockDriverState
*bs
, int is_read
)
1755 return is_read
? bs
->on_read_error
: bs
->on_write_error
;
1758 int bdrv_is_read_only(BlockDriverState
*bs
)
1760 return bs
->read_only
;
1763 int bdrv_is_sg(BlockDriverState
*bs
)
1768 int bdrv_enable_write_cache(BlockDriverState
*bs
)
1770 return bs
->enable_write_cache
;
1773 int bdrv_is_encrypted(BlockDriverState
*bs
)
1775 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
1777 return bs
->encrypted
;
1780 int bdrv_key_required(BlockDriverState
*bs
)
1782 BlockDriverState
*backing_hd
= bs
->backing_hd
;
1784 if (backing_hd
&& backing_hd
->encrypted
&& !backing_hd
->valid_key
)
1786 return (bs
->encrypted
&& !bs
->valid_key
);
1789 int bdrv_set_key(BlockDriverState
*bs
, const char *key
)
1792 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
) {
1793 ret
= bdrv_set_key(bs
->backing_hd
, key
);
1799 if (!bs
->encrypted
) {
1801 } else if (!bs
->drv
|| !bs
->drv
->bdrv_set_key
) {
1804 ret
= bs
->drv
->bdrv_set_key(bs
, key
);
1807 } else if (!bs
->valid_key
) {
1809 /* call the change callback now, we skipped it on open */
1810 bdrv_dev_change_media_cb(bs
, true);
1815 void bdrv_get_format(BlockDriverState
*bs
, char *buf
, int buf_size
)
1820 pstrcpy(buf
, buf_size
, bs
->drv
->format_name
);
1824 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
1829 QLIST_FOREACH(drv
, &bdrv_drivers
, list
) {
1830 it(opaque
, drv
->format_name
);
1834 BlockDriverState
*bdrv_find(const char *name
)
1836 BlockDriverState
*bs
;
1838 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1839 if (!strcmp(name
, bs
->device_name
)) {
1846 BlockDriverState
*bdrv_next(BlockDriverState
*bs
)
1849 return QTAILQ_FIRST(&bdrv_states
);
1851 return QTAILQ_NEXT(bs
, list
);
1854 void bdrv_iterate(void (*it
)(void *opaque
, BlockDriverState
*bs
), void *opaque
)
1856 BlockDriverState
*bs
;
1858 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1863 const char *bdrv_get_device_name(BlockDriverState
*bs
)
1865 return bs
->device_name
;
1868 void bdrv_flush_all(void)
1870 BlockDriverState
*bs
;
1872 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1873 if (!bdrv_is_read_only(bs
) && bdrv_is_inserted(bs
)) {
1879 int bdrv_has_zero_init(BlockDriverState
*bs
)
1883 if (bs
->drv
->bdrv_has_zero_init
) {
1884 return bs
->drv
->bdrv_has_zero_init(bs
);
1891 * Returns true iff the specified sector is present in the disk image. Drivers
1892 * not implementing the functionality are assumed to not support backing files,
1893 * hence all their sectors are reported as allocated.
1895 * 'pnum' is set to the number of sectors (including and immediately following
1896 * the specified sector) that are known to be in the same
1897 * allocated/unallocated state.
1899 * 'nb_sectors' is the max value 'pnum' should be set to.
1901 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
1905 if (!bs
->drv
->bdrv_is_allocated
) {
1906 if (sector_num
>= bs
->total_sectors
) {
1910 n
= bs
->total_sectors
- sector_num
;
1911 *pnum
= (n
< nb_sectors
) ? (n
) : (nb_sectors
);
1914 return bs
->drv
->bdrv_is_allocated(bs
, sector_num
, nb_sectors
, pnum
);
1917 void bdrv_mon_event(const BlockDriverState
*bdrv
,
1918 BlockMonEventAction action
, int is_read
)
1921 const char *action_str
;
1924 case BDRV_ACTION_REPORT
:
1925 action_str
= "report";
1927 case BDRV_ACTION_IGNORE
:
1928 action_str
= "ignore";
1930 case BDRV_ACTION_STOP
:
1931 action_str
= "stop";
1937 data
= qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1940 is_read
? "read" : "write");
1941 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR
, data
);
1943 qobject_decref(data
);
1946 BlockInfoList
*qmp_query_block(Error
**errp
)
1948 BlockInfoList
*head
= NULL
, *cur_item
= NULL
;
1949 BlockDriverState
*bs
;
1951 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
1952 BlockInfoList
*info
= g_malloc0(sizeof(*info
));
1954 info
->value
= g_malloc0(sizeof(*info
->value
));
1955 info
->value
->device
= g_strdup(bs
->device_name
);
1956 info
->value
->type
= g_strdup("unknown");
1957 info
->value
->locked
= bdrv_dev_is_medium_locked(bs
);
1958 info
->value
->removable
= bdrv_dev_has_removable_media(bs
);
1960 if (bdrv_dev_has_removable_media(bs
)) {
1961 info
->value
->has_tray_open
= true;
1962 info
->value
->tray_open
= bdrv_dev_is_tray_open(bs
);
1965 if (bdrv_iostatus_is_enabled(bs
)) {
1966 info
->value
->has_io_status
= true;
1967 info
->value
->io_status
= bs
->iostatus
;
1971 info
->value
->has_inserted
= true;
1972 info
->value
->inserted
= g_malloc0(sizeof(*info
->value
->inserted
));
1973 info
->value
->inserted
->file
= g_strdup(bs
->filename
);
1974 info
->value
->inserted
->ro
= bs
->read_only
;
1975 info
->value
->inserted
->drv
= g_strdup(bs
->drv
->format_name
);
1976 info
->value
->inserted
->encrypted
= bs
->encrypted
;
1977 if (bs
->backing_file
[0]) {
1978 info
->value
->inserted
->has_backing_file
= true;
1979 info
->value
->inserted
->backing_file
= g_strdup(bs
->backing_file
);
1982 if (bs
->io_limits_enabled
) {
1983 info
->value
->inserted
->bps
=
1984 bs
->io_limits
.bps
[BLOCK_IO_LIMIT_TOTAL
];
1985 info
->value
->inserted
->bps_rd
=
1986 bs
->io_limits
.bps
[BLOCK_IO_LIMIT_READ
];
1987 info
->value
->inserted
->bps_wr
=
1988 bs
->io_limits
.bps
[BLOCK_IO_LIMIT_WRITE
];
1989 info
->value
->inserted
->iops
=
1990 bs
->io_limits
.iops
[BLOCK_IO_LIMIT_TOTAL
];
1991 info
->value
->inserted
->iops_rd
=
1992 bs
->io_limits
.iops
[BLOCK_IO_LIMIT_READ
];
1993 info
->value
->inserted
->iops_wr
=
1994 bs
->io_limits
.iops
[BLOCK_IO_LIMIT_WRITE
];
1998 /* XXX: waiting for the qapi to support GSList */
2000 head
= cur_item
= info
;
2002 cur_item
->next
= info
;
2010 /* Consider exposing this as a full fledged QMP command */
2011 static BlockStats
*qmp_query_blockstat(const BlockDriverState
*bs
, Error
**errp
)
2015 s
= g_malloc0(sizeof(*s
));
2017 if (bs
->device_name
[0]) {
2018 s
->has_device
= true;
2019 s
->device
= g_strdup(bs
->device_name
);
2022 s
->stats
= g_malloc0(sizeof(*s
->stats
));
2023 s
->stats
->rd_bytes
= bs
->nr_bytes
[BDRV_ACCT_READ
];
2024 s
->stats
->wr_bytes
= bs
->nr_bytes
[BDRV_ACCT_WRITE
];
2025 s
->stats
->rd_operations
= bs
->nr_ops
[BDRV_ACCT_READ
];
2026 s
->stats
->wr_operations
= bs
->nr_ops
[BDRV_ACCT_WRITE
];
2027 s
->stats
->wr_highest_offset
= bs
->wr_highest_sector
* BDRV_SECTOR_SIZE
;
2028 s
->stats
->flush_operations
= bs
->nr_ops
[BDRV_ACCT_FLUSH
];
2029 s
->stats
->wr_total_time_ns
= bs
->total_time_ns
[BDRV_ACCT_WRITE
];
2030 s
->stats
->rd_total_time_ns
= bs
->total_time_ns
[BDRV_ACCT_READ
];
2031 s
->stats
->flush_total_time_ns
= bs
->total_time_ns
[BDRV_ACCT_FLUSH
];
2034 s
->has_parent
= true;
2035 s
->parent
= qmp_query_blockstat(bs
->file
, NULL
);
2041 BlockStatsList
*qmp_query_blockstats(Error
**errp
)
2043 BlockStatsList
*head
= NULL
, *cur_item
= NULL
;
2044 BlockDriverState
*bs
;
2046 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
2047 BlockStatsList
*info
= g_malloc0(sizeof(*info
));
2048 info
->value
= qmp_query_blockstat(bs
, NULL
);
2050 /* XXX: waiting for the qapi to support GSList */
2052 head
= cur_item
= info
;
2054 cur_item
->next
= info
;
2062 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
)
2064 if (bs
->backing_hd
&& bs
->backing_hd
->encrypted
)
2065 return bs
->backing_file
;
2066 else if (bs
->encrypted
)
2067 return bs
->filename
;
2072 void bdrv_get_backing_filename(BlockDriverState
*bs
,
2073 char *filename
, int filename_size
)
2075 pstrcpy(filename
, filename_size
, bs
->backing_file
);
2078 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
2079 const uint8_t *buf
, int nb_sectors
)
2081 BlockDriver
*drv
= bs
->drv
;
2084 if (!drv
->bdrv_write_compressed
)
2086 if (bdrv_check_request(bs
, sector_num
, nb_sectors
))
2089 if (bs
->dirty_bitmap
) {
2090 set_dirty_bitmap(bs
, sector_num
, nb_sectors
, 1);
2093 return drv
->bdrv_write_compressed(bs
, sector_num
, buf
, nb_sectors
);
2096 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
2098 BlockDriver
*drv
= bs
->drv
;
2101 if (!drv
->bdrv_get_info
)
2103 memset(bdi
, 0, sizeof(*bdi
));
2104 return drv
->bdrv_get_info(bs
, bdi
);
2107 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
2108 int64_t pos
, int size
)
2110 BlockDriver
*drv
= bs
->drv
;
2113 if (drv
->bdrv_save_vmstate
)
2114 return drv
->bdrv_save_vmstate(bs
, buf
, pos
, size
);
2116 return bdrv_save_vmstate(bs
->file
, buf
, pos
, size
);
2120 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
2121 int64_t pos
, int size
)
2123 BlockDriver
*drv
= bs
->drv
;
2126 if (drv
->bdrv_load_vmstate
)
2127 return drv
->bdrv_load_vmstate(bs
, buf
, pos
, size
);
2129 return bdrv_load_vmstate(bs
->file
, buf
, pos
, size
);
2133 void bdrv_debug_event(BlockDriverState
*bs
, BlkDebugEvent event
)
2135 BlockDriver
*drv
= bs
->drv
;
2137 if (!drv
|| !drv
->bdrv_debug_event
) {
2141 return drv
->bdrv_debug_event(bs
, event
);
2145 /**************************************************************/
2146 /* handling of snapshots */
2148 int bdrv_can_snapshot(BlockDriverState
*bs
)
2150 BlockDriver
*drv
= bs
->drv
;
2151 if (!drv
|| !bdrv_is_inserted(bs
) || bdrv_is_read_only(bs
)) {
2155 if (!drv
->bdrv_snapshot_create
) {
2156 if (bs
->file
!= NULL
) {
2157 return bdrv_can_snapshot(bs
->file
);
2165 int bdrv_is_snapshot(BlockDriverState
*bs
)
2167 return !!(bs
->open_flags
& BDRV_O_SNAPSHOT
);
2170 BlockDriverState
*bdrv_snapshots(void)
2172 BlockDriverState
*bs
;
2175 return bs_snapshots
;
2179 while ((bs
= bdrv_next(bs
))) {
2180 if (bdrv_can_snapshot(bs
)) {
2188 int bdrv_snapshot_create(BlockDriverState
*bs
,
2189 QEMUSnapshotInfo
*sn_info
)
2191 BlockDriver
*drv
= bs
->drv
;
2194 if (drv
->bdrv_snapshot_create
)
2195 return drv
->bdrv_snapshot_create(bs
, sn_info
);
2197 return bdrv_snapshot_create(bs
->file
, sn_info
);
2201 int bdrv_snapshot_goto(BlockDriverState
*bs
,
2202 const char *snapshot_id
)
2204 BlockDriver
*drv
= bs
->drv
;
2209 if (drv
->bdrv_snapshot_goto
)
2210 return drv
->bdrv_snapshot_goto(bs
, snapshot_id
);
2213 drv
->bdrv_close(bs
);
2214 ret
= bdrv_snapshot_goto(bs
->file
, snapshot_id
);
2215 open_ret
= drv
->bdrv_open(bs
, bs
->open_flags
);
2217 bdrv_delete(bs
->file
);
2227 int bdrv_snapshot_delete(BlockDriverState
*bs
, const char *snapshot_id
)
2229 BlockDriver
*drv
= bs
->drv
;
2232 if (drv
->bdrv_snapshot_delete
)
2233 return drv
->bdrv_snapshot_delete(bs
, snapshot_id
);
2235 return bdrv_snapshot_delete(bs
->file
, snapshot_id
);
2239 int bdrv_snapshot_list(BlockDriverState
*bs
,
2240 QEMUSnapshotInfo
**psn_info
)
2242 BlockDriver
*drv
= bs
->drv
;
2245 if (drv
->bdrv_snapshot_list
)
2246 return drv
->bdrv_snapshot_list(bs
, psn_info
);
2248 return bdrv_snapshot_list(bs
->file
, psn_info
);
2252 int bdrv_snapshot_load_tmp(BlockDriverState
*bs
,
2253 const char *snapshot_name
)
2255 BlockDriver
*drv
= bs
->drv
;
2259 if (!bs
->read_only
) {
2262 if (drv
->bdrv_snapshot_load_tmp
) {
2263 return drv
->bdrv_snapshot_load_tmp(bs
, snapshot_name
);
2268 #define NB_SUFFIXES 4
2270 char *get_human_readable_size(char *buf
, int buf_size
, int64_t size
)
2272 static const char suffixes
[NB_SUFFIXES
] = "KMGT";
2277 snprintf(buf
, buf_size
, "%" PRId64
, size
);
2280 for(i
= 0; i
< NB_SUFFIXES
; i
++) {
2281 if (size
< (10 * base
)) {
2282 snprintf(buf
, buf_size
, "%0.1f%c",
2283 (double)size
/ base
,
2286 } else if (size
< (1000 * base
) || i
== (NB_SUFFIXES
- 1)) {
2287 snprintf(buf
, buf_size
, "%" PRId64
"%c",
2288 ((size
+ (base
>> 1)) / base
),
2298 char *bdrv_snapshot_dump(char *buf
, int buf_size
, QEMUSnapshotInfo
*sn
)
2300 char buf1
[128], date_buf
[128], clock_buf
[128];
2310 snprintf(buf
, buf_size
,
2311 "%-10s%-20s%7s%20s%15s",
2312 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
2316 ptm
= localtime(&ti
);
2317 strftime(date_buf
, sizeof(date_buf
),
2318 "%Y-%m-%d %H:%M:%S", ptm
);
2320 localtime_r(&ti
, &tm
);
2321 strftime(date_buf
, sizeof(date_buf
),
2322 "%Y-%m-%d %H:%M:%S", &tm
);
2324 secs
= sn
->vm_clock_nsec
/ 1000000000;
2325 snprintf(clock_buf
, sizeof(clock_buf
),
2326 "%02d:%02d:%02d.%03d",
2328 (int)((secs
/ 60) % 60),
2330 (int)((sn
->vm_clock_nsec
/ 1000000) % 1000));
2331 snprintf(buf
, buf_size
,
2332 "%-10s%-20s%7s%20s%15s",
2333 sn
->id_str
, sn
->name
,
2334 get_human_readable_size(buf1
, sizeof(buf1
), sn
->vm_state_size
),
2341 /**************************************************************/
2344 BlockDriverAIOCB
*bdrv_aio_readv(BlockDriverState
*bs
, int64_t sector_num
,
2345 QEMUIOVector
*qiov
, int nb_sectors
,
2346 BlockDriverCompletionFunc
*cb
, void *opaque
)
2348 trace_bdrv_aio_readv(bs
, sector_num
, nb_sectors
, opaque
);
2350 return bdrv_co_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
,
2354 BlockDriverAIOCB
*bdrv_aio_writev(BlockDriverState
*bs
, int64_t sector_num
,
2355 QEMUIOVector
*qiov
, int nb_sectors
,
2356 BlockDriverCompletionFunc
*cb
, void *opaque
)
2358 trace_bdrv_aio_writev(bs
, sector_num
, nb_sectors
, opaque
);
2360 return bdrv_co_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
,
2365 typedef struct MultiwriteCB
{
2370 BlockDriverCompletionFunc
*cb
;
2372 QEMUIOVector
*free_qiov
;
2377 static void multiwrite_user_cb(MultiwriteCB
*mcb
)
2381 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2382 mcb
->callbacks
[i
].cb(mcb
->callbacks
[i
].opaque
, mcb
->error
);
2383 if (mcb
->callbacks
[i
].free_qiov
) {
2384 qemu_iovec_destroy(mcb
->callbacks
[i
].free_qiov
);
2386 g_free(mcb
->callbacks
[i
].free_qiov
);
2387 qemu_vfree(mcb
->callbacks
[i
].free_buf
);
2391 static void multiwrite_cb(void *opaque
, int ret
)
2393 MultiwriteCB
*mcb
= opaque
;
2395 trace_multiwrite_cb(mcb
, ret
);
2397 if (ret
< 0 && !mcb
->error
) {
2401 mcb
->num_requests
--;
2402 if (mcb
->num_requests
== 0) {
2403 multiwrite_user_cb(mcb
);
2408 static int multiwrite_req_compare(const void *a
, const void *b
)
2410 const BlockRequest
*req1
= a
, *req2
= b
;
2413 * Note that we can't simply subtract req2->sector from req1->sector
2414 * here as that could overflow the return value.
2416 if (req1
->sector
> req2
->sector
) {
2418 } else if (req1
->sector
< req2
->sector
) {
2426 * Takes a bunch of requests and tries to merge them. Returns the number of
2427 * requests that remain after merging.
2429 static int multiwrite_merge(BlockDriverState
*bs
, BlockRequest
*reqs
,
2430 int num_reqs
, MultiwriteCB
*mcb
)
2434 // Sort requests by start sector
2435 qsort(reqs
, num_reqs
, sizeof(*reqs
), &multiwrite_req_compare
);
2437 // Check if adjacent requests touch the same clusters. If so, combine them,
2438 // filling up gaps with zero sectors.
2440 for (i
= 1; i
< num_reqs
; i
++) {
2442 int64_t oldreq_last
= reqs
[outidx
].sector
+ reqs
[outidx
].nb_sectors
;
2444 // This handles the cases that are valid for all block drivers, namely
2445 // exactly sequential writes and overlapping writes.
2446 if (reqs
[i
].sector
<= oldreq_last
) {
2450 // The block driver may decide that it makes sense to combine requests
2451 // even if there is a gap of some sectors between them. In this case,
2452 // the gap is filled with zeros (therefore only applicable for yet
2453 // unused space in format like qcow2).
2454 if (!merge
&& bs
->drv
->bdrv_merge_requests
) {
2455 merge
= bs
->drv
->bdrv_merge_requests(bs
, &reqs
[outidx
], &reqs
[i
]);
2458 if (reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1 > IOV_MAX
) {
2464 QEMUIOVector
*qiov
= g_malloc0(sizeof(*qiov
));
2465 qemu_iovec_init(qiov
,
2466 reqs
[outidx
].qiov
->niov
+ reqs
[i
].qiov
->niov
+ 1);
2468 // Add the first request to the merged one. If the requests are
2469 // overlapping, drop the last sectors of the first request.
2470 size
= (reqs
[i
].sector
- reqs
[outidx
].sector
) << 9;
2471 qemu_iovec_concat(qiov
, reqs
[outidx
].qiov
, size
);
2473 // We might need to add some zeros between the two requests
2474 if (reqs
[i
].sector
> oldreq_last
) {
2475 size_t zero_bytes
= (reqs
[i
].sector
- oldreq_last
) << 9;
2476 uint8_t *buf
= qemu_blockalign(bs
, zero_bytes
);
2477 memset(buf
, 0, zero_bytes
);
2478 qemu_iovec_add(qiov
, buf
, zero_bytes
);
2479 mcb
->callbacks
[i
].free_buf
= buf
;
2482 // Add the second request
2483 qemu_iovec_concat(qiov
, reqs
[i
].qiov
, reqs
[i
].qiov
->size
);
2485 reqs
[outidx
].nb_sectors
= qiov
->size
>> 9;
2486 reqs
[outidx
].qiov
= qiov
;
2488 mcb
->callbacks
[i
].free_qiov
= reqs
[outidx
].qiov
;
2491 reqs
[outidx
].sector
= reqs
[i
].sector
;
2492 reqs
[outidx
].nb_sectors
= reqs
[i
].nb_sectors
;
2493 reqs
[outidx
].qiov
= reqs
[i
].qiov
;
2501 * Submit multiple AIO write requests at once.
2503 * On success, the function returns 0 and all requests in the reqs array have
2504 * been submitted. In error case this function returns -1, and any of the
2505 * requests may or may not be submitted yet. In particular, this means that the
2506 * callback will be called for some of the requests, for others it won't. The
2507 * caller must check the error field of the BlockRequest to wait for the right
2508 * callbacks (if error != 0, no callback will be called).
2510 * The implementation may modify the contents of the reqs array, e.g. to merge
2511 * requests. However, the fields opaque and error are left unmodified as they
2512 * are used to signal failure for a single request to the caller.
2514 int bdrv_aio_multiwrite(BlockDriverState
*bs
, BlockRequest
*reqs
, int num_reqs
)
2516 BlockDriverAIOCB
*acb
;
2520 /* don't submit writes if we don't have a medium */
2521 if (bs
->drv
== NULL
) {
2522 for (i
= 0; i
< num_reqs
; i
++) {
2523 reqs
[i
].error
= -ENOMEDIUM
;
2528 if (num_reqs
== 0) {
2532 // Create MultiwriteCB structure
2533 mcb
= g_malloc0(sizeof(*mcb
) + num_reqs
* sizeof(*mcb
->callbacks
));
2534 mcb
->num_requests
= 0;
2535 mcb
->num_callbacks
= num_reqs
;
2537 for (i
= 0; i
< num_reqs
; i
++) {
2538 mcb
->callbacks
[i
].cb
= reqs
[i
].cb
;
2539 mcb
->callbacks
[i
].opaque
= reqs
[i
].opaque
;
2542 // Check for mergable requests
2543 num_reqs
= multiwrite_merge(bs
, reqs
, num_reqs
, mcb
);
2545 trace_bdrv_aio_multiwrite(mcb
, mcb
->num_callbacks
, num_reqs
);
2548 * Run the aio requests. As soon as one request can't be submitted
2549 * successfully, fail all requests that are not yet submitted (we must
2550 * return failure for all requests anyway)
2552 * num_requests cannot be set to the right value immediately: If
2553 * bdrv_aio_writev fails for some request, num_requests would be too high
2554 * and therefore multiwrite_cb() would never recognize the multiwrite
2555 * request as completed. We also cannot use the loop variable i to set it
2556 * when the first request fails because the callback may already have been
2557 * called for previously submitted requests. Thus, num_requests must be
2558 * incremented for each request that is submitted.
2560 * The problem that callbacks may be called early also means that we need
2561 * to take care that num_requests doesn't become 0 before all requests are
2562 * submitted - multiwrite_cb() would consider the multiwrite request
2563 * completed. A dummy request that is "completed" by a manual call to
2564 * multiwrite_cb() takes care of this.
2566 mcb
->num_requests
= 1;
2568 // Run the aio requests
2569 for (i
= 0; i
< num_reqs
; i
++) {
2570 mcb
->num_requests
++;
2571 acb
= bdrv_aio_writev(bs
, reqs
[i
].sector
, reqs
[i
].qiov
,
2572 reqs
[i
].nb_sectors
, multiwrite_cb
, mcb
);
2575 // We can only fail the whole thing if no request has been
2576 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2577 // complete and report the error in the callback.
2579 trace_bdrv_aio_multiwrite_earlyfail(mcb
);
2582 trace_bdrv_aio_multiwrite_latefail(mcb
, i
);
2583 multiwrite_cb(mcb
, -EIO
);
2589 /* Complete the dummy request */
2590 multiwrite_cb(mcb
, 0);
2595 for (i
= 0; i
< mcb
->num_callbacks
; i
++) {
2596 reqs
[i
].error
= -EIO
;
2602 void bdrv_aio_cancel(BlockDriverAIOCB
*acb
)
2604 acb
->pool
->cancel(acb
);
2607 /* block I/O throttling */
2608 static bool bdrv_exceed_bps_limits(BlockDriverState
*bs
, int nb_sectors
,
2609 bool is_write
, double elapsed_time
, uint64_t *wait
)
2611 uint64_t bps_limit
= 0;
2612 double bytes_limit
, bytes_base
, bytes_res
;
2613 double slice_time
, wait_time
;
2615 if (bs
->io_limits
.bps
[BLOCK_IO_LIMIT_TOTAL
]) {
2616 bps_limit
= bs
->io_limits
.bps
[BLOCK_IO_LIMIT_TOTAL
];
2617 } else if (bs
->io_limits
.bps
[is_write
]) {
2618 bps_limit
= bs
->io_limits
.bps
[is_write
];
2627 slice_time
= bs
->slice_end
- bs
->slice_start
;
2628 slice_time
/= (NANOSECONDS_PER_SECOND
);
2629 bytes_limit
= bps_limit
* slice_time
;
2630 bytes_base
= bs
->nr_bytes
[is_write
] - bs
->io_base
.bytes
[is_write
];
2631 if (bs
->io_limits
.bps
[BLOCK_IO_LIMIT_TOTAL
]) {
2632 bytes_base
+= bs
->nr_bytes
[!is_write
] - bs
->io_base
.bytes
[!is_write
];
2635 /* bytes_base: the bytes of data which have been read/written; and
2636 * it is obtained from the history statistic info.
2637 * bytes_res: the remaining bytes of data which need to be read/written.
2638 * (bytes_base + bytes_res) / bps_limit: used to calcuate
2639 * the total time for completing reading/writting all data.
2641 bytes_res
= (unsigned) nb_sectors
* BDRV_SECTOR_SIZE
;
2643 if (bytes_base
+ bytes_res
<= bytes_limit
) {
2651 /* Calc approx time to dispatch */
2652 wait_time
= (bytes_base
+ bytes_res
) / bps_limit
- elapsed_time
;
2654 /* When the I/O rate at runtime exceeds the limits,
2655 * bs->slice_end need to be extended in order that the current statistic
2656 * info can be kept until the timer fire, so it is increased and tuned
2657 * based on the result of experiment.
2659 bs
->slice_time
= wait_time
* BLOCK_IO_SLICE_TIME
* 10;
2660 bs
->slice_end
+= bs
->slice_time
- 3 * BLOCK_IO_SLICE_TIME
;
2662 *wait
= wait_time
* BLOCK_IO_SLICE_TIME
* 10;
2668 static bool bdrv_exceed_iops_limits(BlockDriverState
*bs
, bool is_write
,
2669 double elapsed_time
, uint64_t *wait
)
2671 uint64_t iops_limit
= 0;
2672 double ios_limit
, ios_base
;
2673 double slice_time
, wait_time
;
2675 if (bs
->io_limits
.iops
[BLOCK_IO_LIMIT_TOTAL
]) {
2676 iops_limit
= bs
->io_limits
.iops
[BLOCK_IO_LIMIT_TOTAL
];
2677 } else if (bs
->io_limits
.iops
[is_write
]) {
2678 iops_limit
= bs
->io_limits
.iops
[is_write
];
2687 slice_time
= bs
->slice_end
- bs
->slice_start
;
2688 slice_time
/= (NANOSECONDS_PER_SECOND
);
2689 ios_limit
= iops_limit
* slice_time
;
2690 ios_base
= bs
->nr_ops
[is_write
] - bs
->io_base
.ios
[is_write
];
2691 if (bs
->io_limits
.iops
[BLOCK_IO_LIMIT_TOTAL
]) {
2692 ios_base
+= bs
->nr_ops
[!is_write
] - bs
->io_base
.ios
[!is_write
];
2695 if (ios_base
+ 1 <= ios_limit
) {
2703 /* Calc approx time to dispatch */
2704 wait_time
= (ios_base
+ 1) / iops_limit
;
2705 if (wait_time
> elapsed_time
) {
2706 wait_time
= wait_time
- elapsed_time
;
2711 bs
->slice_time
= wait_time
* BLOCK_IO_SLICE_TIME
* 10;
2712 bs
->slice_end
+= bs
->slice_time
- 3 * BLOCK_IO_SLICE_TIME
;
2714 *wait
= wait_time
* BLOCK_IO_SLICE_TIME
* 10;
2720 static bool bdrv_exceed_io_limits(BlockDriverState
*bs
, int nb_sectors
,
2721 bool is_write
, int64_t *wait
)
2723 int64_t now
, max_wait
;
2724 uint64_t bps_wait
= 0, iops_wait
= 0;
2725 double elapsed_time
;
2726 int bps_ret
, iops_ret
;
2728 now
= qemu_get_clock_ns(vm_clock
);
2729 if ((bs
->slice_start
< now
)
2730 && (bs
->slice_end
> now
)) {
2731 bs
->slice_end
= now
+ bs
->slice_time
;
2733 bs
->slice_time
= 5 * BLOCK_IO_SLICE_TIME
;
2734 bs
->slice_start
= now
;
2735 bs
->slice_end
= now
+ bs
->slice_time
;
2737 bs
->io_base
.bytes
[is_write
] = bs
->nr_bytes
[is_write
];
2738 bs
->io_base
.bytes
[!is_write
] = bs
->nr_bytes
[!is_write
];
2740 bs
->io_base
.ios
[is_write
] = bs
->nr_ops
[is_write
];
2741 bs
->io_base
.ios
[!is_write
] = bs
->nr_ops
[!is_write
];
2744 elapsed_time
= now
- bs
->slice_start
;
2745 elapsed_time
/= (NANOSECONDS_PER_SECOND
);
2747 bps_ret
= bdrv_exceed_bps_limits(bs
, nb_sectors
,
2748 is_write
, elapsed_time
, &bps_wait
);
2749 iops_ret
= bdrv_exceed_iops_limits(bs
, is_write
,
2750 elapsed_time
, &iops_wait
);
2751 if (bps_ret
|| iops_ret
) {
2752 max_wait
= bps_wait
> iops_wait
? bps_wait
: iops_wait
;
2757 now
= qemu_get_clock_ns(vm_clock
);
2758 if (bs
->slice_end
< now
+ max_wait
) {
2759 bs
->slice_end
= now
+ max_wait
;
2772 /**************************************************************/
2773 /* async block device emulation */
2775 typedef struct BlockDriverAIOCBSync
{
2776 BlockDriverAIOCB common
;
2779 /* vector translation state */
2783 } BlockDriverAIOCBSync
;
2785 static void bdrv_aio_cancel_em(BlockDriverAIOCB
*blockacb
)
2787 BlockDriverAIOCBSync
*acb
=
2788 container_of(blockacb
, BlockDriverAIOCBSync
, common
);
2789 qemu_bh_delete(acb
->bh
);
2791 qemu_aio_release(acb
);
2794 static AIOPool bdrv_em_aio_pool
= {
2795 .aiocb_size
= sizeof(BlockDriverAIOCBSync
),
2796 .cancel
= bdrv_aio_cancel_em
,
2799 static void bdrv_aio_bh_cb(void *opaque
)
2801 BlockDriverAIOCBSync
*acb
= opaque
;
2804 qemu_iovec_from_buffer(acb
->qiov
, acb
->bounce
, acb
->qiov
->size
);
2805 qemu_vfree(acb
->bounce
);
2806 acb
->common
.cb(acb
->common
.opaque
, acb
->ret
);
2807 qemu_bh_delete(acb
->bh
);
2809 qemu_aio_release(acb
);
2812 static BlockDriverAIOCB
*bdrv_aio_rw_vector(BlockDriverState
*bs
,
2816 BlockDriverCompletionFunc
*cb
,
2821 BlockDriverAIOCBSync
*acb
;
2823 acb
= qemu_aio_get(&bdrv_em_aio_pool
, bs
, cb
, opaque
);
2824 acb
->is_write
= is_write
;
2826 acb
->bounce
= qemu_blockalign(bs
, qiov
->size
);
2829 acb
->bh
= qemu_bh_new(bdrv_aio_bh_cb
, acb
);
2832 qemu_iovec_to_buffer(acb
->qiov
, acb
->bounce
);
2833 acb
->ret
= bs
->drv
->bdrv_write(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2835 acb
->ret
= bs
->drv
->bdrv_read(bs
, sector_num
, acb
->bounce
, nb_sectors
);
2838 qemu_bh_schedule(acb
->bh
);
2840 return &acb
->common
;
2843 static BlockDriverAIOCB
*bdrv_aio_readv_em(BlockDriverState
*bs
,
2844 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2845 BlockDriverCompletionFunc
*cb
, void *opaque
)
2847 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 0);
2850 static BlockDriverAIOCB
*bdrv_aio_writev_em(BlockDriverState
*bs
,
2851 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
2852 BlockDriverCompletionFunc
*cb
, void *opaque
)
2854 return bdrv_aio_rw_vector(bs
, sector_num
, qiov
, nb_sectors
, cb
, opaque
, 1);
2858 typedef struct BlockDriverAIOCBCoroutine
{
2859 BlockDriverAIOCB common
;
2863 } BlockDriverAIOCBCoroutine
;
2865 static void bdrv_aio_co_cancel_em(BlockDriverAIOCB
*blockacb
)
2870 static AIOPool bdrv_em_co_aio_pool
= {
2871 .aiocb_size
= sizeof(BlockDriverAIOCBCoroutine
),
2872 .cancel
= bdrv_aio_co_cancel_em
,
2875 static void bdrv_co_em_bh(void *opaque
)
2877 BlockDriverAIOCBCoroutine
*acb
= opaque
;
2879 acb
->common
.cb(acb
->common
.opaque
, acb
->req
.error
);
2880 qemu_bh_delete(acb
->bh
);
2881 qemu_aio_release(acb
);
2884 /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */
2885 static void coroutine_fn
bdrv_co_do_rw(void *opaque
)
2887 BlockDriverAIOCBCoroutine
*acb
= opaque
;
2888 BlockDriverState
*bs
= acb
->common
.bs
;
2890 if (!acb
->is_write
) {
2891 acb
->req
.error
= bdrv_co_do_readv(bs
, acb
->req
.sector
,
2892 acb
->req
.nb_sectors
, acb
->req
.qiov
);
2894 acb
->req
.error
= bdrv_co_do_writev(bs
, acb
->req
.sector
,
2895 acb
->req
.nb_sectors
, acb
->req
.qiov
);
2898 acb
->bh
= qemu_bh_new(bdrv_co_em_bh
, acb
);
2899 qemu_bh_schedule(acb
->bh
);
2902 static BlockDriverAIOCB
*bdrv_co_aio_rw_vector(BlockDriverState
*bs
,
2906 BlockDriverCompletionFunc
*cb
,
2911 BlockDriverAIOCBCoroutine
*acb
;
2913 acb
= qemu_aio_get(&bdrv_em_co_aio_pool
, bs
, cb
, opaque
);
2914 acb
->req
.sector
= sector_num
;
2915 acb
->req
.nb_sectors
= nb_sectors
;
2916 acb
->req
.qiov
= qiov
;
2917 acb
->is_write
= is_write
;
2919 co
= qemu_coroutine_create(bdrv_co_do_rw
);
2920 qemu_coroutine_enter(co
, acb
);
2922 return &acb
->common
;
2925 static void coroutine_fn
bdrv_aio_flush_co_entry(void *opaque
)
2927 BlockDriverAIOCBCoroutine
*acb
= opaque
;
2928 BlockDriverState
*bs
= acb
->common
.bs
;
2930 acb
->req
.error
= bdrv_co_flush(bs
);
2931 acb
->bh
= qemu_bh_new(bdrv_co_em_bh
, acb
);
2932 qemu_bh_schedule(acb
->bh
);
2935 BlockDriverAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
2936 BlockDriverCompletionFunc
*cb
, void *opaque
)
2938 trace_bdrv_aio_flush(bs
, opaque
);
2941 BlockDriverAIOCBCoroutine
*acb
;
2943 acb
= qemu_aio_get(&bdrv_em_co_aio_pool
, bs
, cb
, opaque
);
2944 co
= qemu_coroutine_create(bdrv_aio_flush_co_entry
);
2945 qemu_coroutine_enter(co
, acb
);
2947 return &acb
->common
;
2950 static void coroutine_fn
bdrv_aio_discard_co_entry(void *opaque
)
2952 BlockDriverAIOCBCoroutine
*acb
= opaque
;
2953 BlockDriverState
*bs
= acb
->common
.bs
;
2955 acb
->req
.error
= bdrv_co_discard(bs
, acb
->req
.sector
, acb
->req
.nb_sectors
);
2956 acb
->bh
= qemu_bh_new(bdrv_co_em_bh
, acb
);
2957 qemu_bh_schedule(acb
->bh
);
2960 BlockDriverAIOCB
*bdrv_aio_discard(BlockDriverState
*bs
,
2961 int64_t sector_num
, int nb_sectors
,
2962 BlockDriverCompletionFunc
*cb
, void *opaque
)
2965 BlockDriverAIOCBCoroutine
*acb
;
2967 trace_bdrv_aio_discard(bs
, sector_num
, nb_sectors
, opaque
);
2969 acb
= qemu_aio_get(&bdrv_em_co_aio_pool
, bs
, cb
, opaque
);
2970 acb
->req
.sector
= sector_num
;
2971 acb
->req
.nb_sectors
= nb_sectors
;
2972 co
= qemu_coroutine_create(bdrv_aio_discard_co_entry
);
2973 qemu_coroutine_enter(co
, acb
);
2975 return &acb
->common
;
2978 void bdrv_init(void)
2980 module_call_init(MODULE_INIT_BLOCK
);
2983 void bdrv_init_with_whitelist(void)
2985 use_bdrv_whitelist
= 1;
2989 void *qemu_aio_get(AIOPool
*pool
, BlockDriverState
*bs
,
2990 BlockDriverCompletionFunc
*cb
, void *opaque
)
2992 BlockDriverAIOCB
*acb
;
2994 if (pool
->free_aiocb
) {
2995 acb
= pool
->free_aiocb
;
2996 pool
->free_aiocb
= acb
->next
;
2998 acb
= g_malloc0(pool
->aiocb_size
);
3003 acb
->opaque
= opaque
;
3007 void qemu_aio_release(void *p
)
3009 BlockDriverAIOCB
*acb
= (BlockDriverAIOCB
*)p
;
3010 AIOPool
*pool
= acb
->pool
;
3011 acb
->next
= pool
->free_aiocb
;
3012 pool
->free_aiocb
= acb
;
3015 /**************************************************************/
3016 /* Coroutine block device emulation */
3018 typedef struct CoroutineIOCompletion
{
3019 Coroutine
*coroutine
;
3021 } CoroutineIOCompletion
;
3023 static void bdrv_co_io_em_complete(void *opaque
, int ret
)
3025 CoroutineIOCompletion
*co
= opaque
;
3028 qemu_coroutine_enter(co
->coroutine
, NULL
);
3031 static int coroutine_fn
bdrv_co_io_em(BlockDriverState
*bs
, int64_t sector_num
,
3032 int nb_sectors
, QEMUIOVector
*iov
,
3035 CoroutineIOCompletion co
= {
3036 .coroutine
= qemu_coroutine_self(),
3038 BlockDriverAIOCB
*acb
;
3041 acb
= bs
->drv
->bdrv_aio_writev(bs
, sector_num
, iov
, nb_sectors
,
3042 bdrv_co_io_em_complete
, &co
);
3044 acb
= bs
->drv
->bdrv_aio_readv(bs
, sector_num
, iov
, nb_sectors
,
3045 bdrv_co_io_em_complete
, &co
);
3048 trace_bdrv_co_io_em(bs
, sector_num
, nb_sectors
, is_write
, acb
);
3052 qemu_coroutine_yield();
3057 static int coroutine_fn
bdrv_co_readv_em(BlockDriverState
*bs
,
3058 int64_t sector_num
, int nb_sectors
,
3061 return bdrv_co_io_em(bs
, sector_num
, nb_sectors
, iov
, false);
3064 static int coroutine_fn
bdrv_co_writev_em(BlockDriverState
*bs
,
3065 int64_t sector_num
, int nb_sectors
,
3068 return bdrv_co_io_em(bs
, sector_num
, nb_sectors
, iov
, true);
3071 static void coroutine_fn
bdrv_flush_co_entry(void *opaque
)
3073 RwCo
*rwco
= opaque
;
3075 rwco
->ret
= bdrv_co_flush(rwco
->bs
);
3078 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
)
3086 /* Write back cached data to the OS even with cache=unsafe */
3087 if (bs
->drv
->bdrv_co_flush_to_os
) {
3088 ret
= bs
->drv
->bdrv_co_flush_to_os(bs
);
3094 /* But don't actually force it to the disk with cache=unsafe */
3095 if (bs
->open_flags
& BDRV_O_NO_FLUSH
) {
3099 if (bs
->drv
->bdrv_co_flush_to_disk
) {
3100 return bs
->drv
->bdrv_co_flush_to_disk(bs
);
3101 } else if (bs
->drv
->bdrv_aio_flush
) {
3102 BlockDriverAIOCB
*acb
;
3103 CoroutineIOCompletion co
= {
3104 .coroutine
= qemu_coroutine_self(),
3107 acb
= bs
->drv
->bdrv_aio_flush(bs
, bdrv_co_io_em_complete
, &co
);
3111 qemu_coroutine_yield();
3116 * Some block drivers always operate in either writethrough or unsafe
3117 * mode and don't support bdrv_flush therefore. Usually qemu doesn't
3118 * know how the server works (because the behaviour is hardcoded or
3119 * depends on server-side configuration), so we can't ensure that
3120 * everything is safe on disk. Returning an error doesn't work because
3121 * that would break guests even if the server operates in writethrough
3124 * Let's hope the user knows what he's doing.
3130 void bdrv_invalidate_cache(BlockDriverState
*bs
)
3132 if (bs
->drv
&& bs
->drv
->bdrv_invalidate_cache
) {
3133 bs
->drv
->bdrv_invalidate_cache(bs
);
3137 void bdrv_invalidate_cache_all(void)
3139 BlockDriverState
*bs
;
3141 QTAILQ_FOREACH(bs
, &bdrv_states
, list
) {
3142 bdrv_invalidate_cache(bs
);
3146 int bdrv_flush(BlockDriverState
*bs
)
3154 if (qemu_in_coroutine()) {
3155 /* Fast-path if already in coroutine context */
3156 bdrv_flush_co_entry(&rwco
);
3158 co
= qemu_coroutine_create(bdrv_flush_co_entry
);
3159 qemu_coroutine_enter(co
, &rwco
);
3160 while (rwco
.ret
== NOT_DONE
) {
3168 static void coroutine_fn
bdrv_discard_co_entry(void *opaque
)
3170 RwCo
*rwco
= opaque
;
3172 rwco
->ret
= bdrv_co_discard(rwco
->bs
, rwco
->sector_num
, rwco
->nb_sectors
);
3175 int coroutine_fn
bdrv_co_discard(BlockDriverState
*bs
, int64_t sector_num
,
3180 } else if (bdrv_check_request(bs
, sector_num
, nb_sectors
)) {
3182 } else if (bs
->read_only
) {
3184 } else if (bs
->drv
->bdrv_co_discard
) {
3185 return bs
->drv
->bdrv_co_discard(bs
, sector_num
, nb_sectors
);
3186 } else if (bs
->drv
->bdrv_aio_discard
) {
3187 BlockDriverAIOCB
*acb
;
3188 CoroutineIOCompletion co
= {
3189 .coroutine
= qemu_coroutine_self(),
3192 acb
= bs
->drv
->bdrv_aio_discard(bs
, sector_num
, nb_sectors
,
3193 bdrv_co_io_em_complete
, &co
);
3197 qemu_coroutine_yield();
3205 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
)
3210 .sector_num
= sector_num
,
3211 .nb_sectors
= nb_sectors
,
3215 if (qemu_in_coroutine()) {
3216 /* Fast-path if already in coroutine context */
3217 bdrv_discard_co_entry(&rwco
);
3219 co
= qemu_coroutine_create(bdrv_discard_co_entry
);
3220 qemu_coroutine_enter(co
, &rwco
);
3221 while (rwco
.ret
== NOT_DONE
) {
3229 /**************************************************************/
3230 /* removable device support */
3233 * Return TRUE if the media is present
3235 int bdrv_is_inserted(BlockDriverState
*bs
)
3237 BlockDriver
*drv
= bs
->drv
;
3241 if (!drv
->bdrv_is_inserted
)
3243 return drv
->bdrv_is_inserted(bs
);
3247 * Return whether the media changed since the last call to this
3248 * function, or -ENOTSUP if we don't know. Most drivers don't know.
3250 int bdrv_media_changed(BlockDriverState
*bs
)
3252 BlockDriver
*drv
= bs
->drv
;
3254 if (drv
&& drv
->bdrv_media_changed
) {
3255 return drv
->bdrv_media_changed(bs
);
3261 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
3263 void bdrv_eject(BlockDriverState
*bs
, int eject_flag
)
3265 BlockDriver
*drv
= bs
->drv
;
3267 if (drv
&& drv
->bdrv_eject
) {
3268 drv
->bdrv_eject(bs
, eject_flag
);
3273 * Lock or unlock the media (if it is locked, the user won't be able
3274 * to eject it manually).
3276 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
)
3278 BlockDriver
*drv
= bs
->drv
;
3280 trace_bdrv_lock_medium(bs
, locked
);
3282 if (drv
&& drv
->bdrv_lock_medium
) {
3283 drv
->bdrv_lock_medium(bs
, locked
);
3287 /* needed for generic scsi interface */
3289 int bdrv_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
)
3291 BlockDriver
*drv
= bs
->drv
;
3293 if (drv
&& drv
->bdrv_ioctl
)
3294 return drv
->bdrv_ioctl(bs
, req
, buf
);
3298 BlockDriverAIOCB
*bdrv_aio_ioctl(BlockDriverState
*bs
,
3299 unsigned long int req
, void *buf
,
3300 BlockDriverCompletionFunc
*cb
, void *opaque
)
3302 BlockDriver
*drv
= bs
->drv
;
3304 if (drv
&& drv
->bdrv_aio_ioctl
)
3305 return drv
->bdrv_aio_ioctl(bs
, req
, buf
, cb
, opaque
);
3309 void bdrv_set_buffer_alignment(BlockDriverState
*bs
, int align
)
3311 bs
->buffer_alignment
= align
;
3314 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
)
3316 return qemu_memalign((bs
&& bs
->buffer_alignment
) ? bs
->buffer_alignment
: 512, size
);
3319 void bdrv_set_dirty_tracking(BlockDriverState
*bs
, int enable
)
3321 int64_t bitmap_size
;
3323 bs
->dirty_count
= 0;
3325 if (!bs
->dirty_bitmap
) {
3326 bitmap_size
= (bdrv_getlength(bs
) >> BDRV_SECTOR_BITS
) +
3327 BDRV_SECTORS_PER_DIRTY_CHUNK
* 8 - 1;
3328 bitmap_size
/= BDRV_SECTORS_PER_DIRTY_CHUNK
* 8;
3330 bs
->dirty_bitmap
= g_malloc0(bitmap_size
);
3333 if (bs
->dirty_bitmap
) {
3334 g_free(bs
->dirty_bitmap
);
3335 bs
->dirty_bitmap
= NULL
;
3340 int bdrv_get_dirty(BlockDriverState
*bs
, int64_t sector
)
3342 int64_t chunk
= sector
/ (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK
;
3344 if (bs
->dirty_bitmap
&&
3345 (sector
<< BDRV_SECTOR_BITS
) < bdrv_getlength(bs
)) {
3346 return !!(bs
->dirty_bitmap
[chunk
/ (sizeof(unsigned long) * 8)] &
3347 (1UL << (chunk
% (sizeof(unsigned long) * 8))));
3353 void bdrv_reset_dirty(BlockDriverState
*bs
, int64_t cur_sector
,
3356 set_dirty_bitmap(bs
, cur_sector
, nr_sectors
, 0);
3359 int64_t bdrv_get_dirty_count(BlockDriverState
*bs
)
3361 return bs
->dirty_count
;
3364 void bdrv_set_in_use(BlockDriverState
*bs
, int in_use
)
3366 assert(bs
->in_use
!= in_use
);
3367 bs
->in_use
= in_use
;
3370 int bdrv_in_use(BlockDriverState
*bs
)
3375 void bdrv_iostatus_enable(BlockDriverState
*bs
)
3377 bs
->iostatus_enabled
= true;
3378 bs
->iostatus
= BLOCK_DEVICE_IO_STATUS_OK
;
3381 /* The I/O status is only enabled if the drive explicitly
3382 * enables it _and_ the VM is configured to stop on errors */
3383 bool bdrv_iostatus_is_enabled(const BlockDriverState
*bs
)
3385 return (bs
->iostatus_enabled
&&
3386 (bs
->on_write_error
== BLOCK_ERR_STOP_ENOSPC
||
3387 bs
->on_write_error
== BLOCK_ERR_STOP_ANY
||
3388 bs
->on_read_error
== BLOCK_ERR_STOP_ANY
));
3391 void bdrv_iostatus_disable(BlockDriverState
*bs
)
3393 bs
->iostatus_enabled
= false;
3396 void bdrv_iostatus_reset(BlockDriverState
*bs
)
3398 if (bdrv_iostatus_is_enabled(bs
)) {
3399 bs
->iostatus
= BLOCK_DEVICE_IO_STATUS_OK
;
3403 /* XXX: Today this is set by device models because it makes the implementation
3404 quite simple. However, the block layer knows about the error, so it's
3405 possible to implement this without device models being involved */
3406 void bdrv_iostatus_set_err(BlockDriverState
*bs
, int error
)
3408 if (bdrv_iostatus_is_enabled(bs
) &&
3409 bs
->iostatus
== BLOCK_DEVICE_IO_STATUS_OK
) {
3411 bs
->iostatus
= error
== ENOSPC
? BLOCK_DEVICE_IO_STATUS_NOSPACE
:
3412 BLOCK_DEVICE_IO_STATUS_FAILED
;
3417 bdrv_acct_start(BlockDriverState
*bs
, BlockAcctCookie
*cookie
, int64_t bytes
,
3418 enum BlockAcctType type
)
3420 assert(type
< BDRV_MAX_IOTYPE
);
3422 cookie
->bytes
= bytes
;
3423 cookie
->start_time_ns
= get_clock();
3424 cookie
->type
= type
;
3428 bdrv_acct_done(BlockDriverState
*bs
, BlockAcctCookie
*cookie
)
3430 assert(cookie
->type
< BDRV_MAX_IOTYPE
);
3432 bs
->nr_bytes
[cookie
->type
] += cookie
->bytes
;
3433 bs
->nr_ops
[cookie
->type
]++;
3434 bs
->total_time_ns
[cookie
->type
] += get_clock() - cookie
->start_time_ns
;
3437 int bdrv_img_create(const char *filename
, const char *fmt
,
3438 const char *base_filename
, const char *base_fmt
,
3439 char *options
, uint64_t img_size
, int flags
)
3441 QEMUOptionParameter
*param
= NULL
, *create_options
= NULL
;
3442 QEMUOptionParameter
*backing_fmt
, *backing_file
, *size
;
3443 BlockDriverState
*bs
= NULL
;
3444 BlockDriver
*drv
, *proto_drv
;
3445 BlockDriver
*backing_drv
= NULL
;
3448 /* Find driver and parse its options */
3449 drv
= bdrv_find_format(fmt
);
3451 error_report("Unknown file format '%s'", fmt
);
3456 proto_drv
= bdrv_find_protocol(filename
);
3458 error_report("Unknown protocol '%s'", filename
);
3463 create_options
= append_option_parameters(create_options
,
3464 drv
->create_options
);
3465 create_options
= append_option_parameters(create_options
,
3466 proto_drv
->create_options
);
3468 /* Create parameter list with default values */
3469 param
= parse_option_parameters("", create_options
, param
);
3471 set_option_parameter_int(param
, BLOCK_OPT_SIZE
, img_size
);
3473 /* Parse -o options */
3475 param
= parse_option_parameters(options
, create_options
, param
);
3476 if (param
== NULL
) {
3477 error_report("Invalid options for file format '%s'.", fmt
);
3483 if (base_filename
) {
3484 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FILE
,
3486 error_report("Backing file not supported for file format '%s'",
3494 if (set_option_parameter(param
, BLOCK_OPT_BACKING_FMT
, base_fmt
)) {
3495 error_report("Backing file format not supported for file "
3496 "format '%s'", fmt
);
3502 backing_file
= get_option_parameter(param
, BLOCK_OPT_BACKING_FILE
);
3503 if (backing_file
&& backing_file
->value
.s
) {
3504 if (!strcmp(filename
, backing_file
->value
.s
)) {
3505 error_report("Error: Trying to create an image with the "
3506 "same filename as the backing file");
3512 backing_fmt
= get_option_parameter(param
, BLOCK_OPT_BACKING_FMT
);
3513 if (backing_fmt
&& backing_fmt
->value
.s
) {
3514 backing_drv
= bdrv_find_format(backing_fmt
->value
.s
);
3516 error_report("Unknown backing file format '%s'",
3517 backing_fmt
->value
.s
);
3523 // The size for the image must always be specified, with one exception:
3524 // If we are using a backing file, we can obtain the size from there
3525 size
= get_option_parameter(param
, BLOCK_OPT_SIZE
);
3526 if (size
&& size
->value
.n
== -1) {
3527 if (backing_file
&& backing_file
->value
.s
) {
3533 ret
= bdrv_open(bs
, backing_file
->value
.s
, flags
, backing_drv
);
3535 error_report("Could not open '%s'", backing_file
->value
.s
);
3538 bdrv_get_geometry(bs
, &size
);
3541 snprintf(buf
, sizeof(buf
), "%" PRId64
, size
);
3542 set_option_parameter(param
, BLOCK_OPT_SIZE
, buf
);
3544 error_report("Image creation needs a size parameter");
3550 printf("Formatting '%s', fmt=%s ", filename
, fmt
);
3551 print_option_parameters(param
);
3554 ret
= bdrv_create(drv
, filename
, param
);
3557 if (ret
== -ENOTSUP
) {
3558 error_report("Formatting or formatting option not supported for "
3559 "file format '%s'", fmt
);
3560 } else if (ret
== -EFBIG
) {
3561 error_report("The image size is too large for file format '%s'",
3564 error_report("%s: error while creating %s: %s", filename
, fmt
,
3570 free_option_parameters(create_options
);
3571 free_option_parameters(param
);