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
27 #include "block/accounting.h"
28 #include "block/block.h"
29 #include "qemu/option.h"
30 #include "qemu/queue.h"
31 #include "block/coroutine.h"
32 #include "qemu/timer.h"
33 #include "qapi-types.h"
34 #include "qapi/qmp/qerror.h"
35 #include "monitor/monitor.h"
36 #include "qemu/hbitmap.h"
37 #include "block/snapshot.h"
38 #include "qemu/main-loop.h"
39 #include "qemu/throttle.h"
41 #define BLOCK_FLAG_ENCRYPT 1
42 #define BLOCK_FLAG_COMPAT6 4
43 #define BLOCK_FLAG_LAZY_REFCOUNTS 8
45 #define BLOCK_OPT_SIZE "size"
46 #define BLOCK_OPT_ENCRYPT "encryption"
47 #define BLOCK_OPT_COMPAT6 "compat6"
48 #define BLOCK_OPT_BACKING_FILE "backing_file"
49 #define BLOCK_OPT_BACKING_FMT "backing_fmt"
50 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
51 #define BLOCK_OPT_TABLE_SIZE "table_size"
52 #define BLOCK_OPT_PREALLOC "preallocation"
53 #define BLOCK_OPT_SUBFMT "subformat"
54 #define BLOCK_OPT_COMPAT_LEVEL "compat"
55 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
56 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
57 #define BLOCK_OPT_REDUNDANCY "redundancy"
58 #define BLOCK_OPT_NOCOW "nocow"
59 #define BLOCK_OPT_OBJECT_SIZE "object_size"
60 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
62 #define BLOCK_PROBE_BUF_SIZE 512
64 typedef struct BdrvTrackedRequest
{
71 int64_t overlap_offset
;
72 unsigned int overlap_bytes
;
74 QLIST_ENTRY(BdrvTrackedRequest
) list
;
75 Coroutine
*co
; /* owner, used for deadlock detection */
76 CoQueue wait_queue
; /* coroutines blocked on this request */
78 struct BdrvTrackedRequest
*waiting_for
;
82 const char *format_name
;
85 /* set to true if the BlockDriver is a block filter */
87 /* for snapshots block filter like Quorum can implement the
88 * following recursive callback.
89 * It's purpose is to recurse on the filter children while calling
90 * bdrv_recurse_is_first_non_filter on them.
91 * For a sample implementation look in the future Quorum block filter.
93 bool (*bdrv_recurse_is_first_non_filter
)(BlockDriverState
*bs
,
94 BlockDriverState
*candidate
);
96 int (*bdrv_probe
)(const uint8_t *buf
, int buf_size
, const char *filename
);
97 int (*bdrv_probe_device
)(const char *filename
);
99 /* Any driver implementing this callback is expected to be able to handle
100 * NULL file names in its .bdrv_open() implementation */
101 void (*bdrv_parse_filename
)(const char *filename
, QDict
*options
, Error
**errp
);
102 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
103 * this field set to true, except ones that are defined only by their
105 * An example of the last type will be the quorum block driver.
107 bool bdrv_needs_filename
;
109 /* Set if a driver can support backing files */
110 bool supports_backing
;
112 /* For handling image reopen for split or non-split files */
113 int (*bdrv_reopen_prepare
)(BDRVReopenState
*reopen_state
,
114 BlockReopenQueue
*queue
, Error
**errp
);
115 void (*bdrv_reopen_commit
)(BDRVReopenState
*reopen_state
);
116 void (*bdrv_reopen_abort
)(BDRVReopenState
*reopen_state
);
118 int (*bdrv_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
120 int (*bdrv_file_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
122 int (*bdrv_read
)(BlockDriverState
*bs
, int64_t sector_num
,
123 uint8_t *buf
, int nb_sectors
);
124 int (*bdrv_write
)(BlockDriverState
*bs
, int64_t sector_num
,
125 const uint8_t *buf
, int nb_sectors
);
126 void (*bdrv_close
)(BlockDriverState
*bs
);
127 void (*bdrv_rebind
)(BlockDriverState
*bs
);
128 int (*bdrv_create
)(const char *filename
, QemuOpts
*opts
, Error
**errp
);
129 int (*bdrv_set_key
)(BlockDriverState
*bs
, const char *key
);
130 int (*bdrv_make_empty
)(BlockDriverState
*bs
);
132 void (*bdrv_refresh_filename
)(BlockDriverState
*bs
);
135 BlockAIOCB
*(*bdrv_aio_readv
)(BlockDriverState
*bs
,
136 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
137 BlockCompletionFunc
*cb
, void *opaque
);
138 BlockAIOCB
*(*bdrv_aio_writev
)(BlockDriverState
*bs
,
139 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
140 BlockCompletionFunc
*cb
, void *opaque
);
141 BlockAIOCB
*(*bdrv_aio_flush
)(BlockDriverState
*bs
,
142 BlockCompletionFunc
*cb
, void *opaque
);
143 BlockAIOCB
*(*bdrv_aio_discard
)(BlockDriverState
*bs
,
144 int64_t sector_num
, int nb_sectors
,
145 BlockCompletionFunc
*cb
, void *opaque
);
147 int coroutine_fn (*bdrv_co_readv
)(BlockDriverState
*bs
,
148 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
149 int coroutine_fn (*bdrv_co_writev
)(BlockDriverState
*bs
,
150 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
152 * Efficiently zero a region of the disk image. Typically an image format
153 * would use a compact metadata representation to implement this. This
154 * function pointer may be NULL and .bdrv_co_writev() will be called
157 int coroutine_fn (*bdrv_co_write_zeroes
)(BlockDriverState
*bs
,
158 int64_t sector_num
, int nb_sectors
, BdrvRequestFlags flags
);
159 int coroutine_fn (*bdrv_co_discard
)(BlockDriverState
*bs
,
160 int64_t sector_num
, int nb_sectors
);
161 int64_t coroutine_fn (*bdrv_co_get_block_status
)(BlockDriverState
*bs
,
162 int64_t sector_num
, int nb_sectors
, int *pnum
);
165 * Invalidate any cached meta-data.
167 void (*bdrv_invalidate_cache
)(BlockDriverState
*bs
, Error
**errp
);
170 * Flushes all data that was already written to the OS all the way down to
171 * the disk (for example raw-posix calls fsync()).
173 int coroutine_fn (*bdrv_co_flush_to_disk
)(BlockDriverState
*bs
);
176 * Flushes all internal caches to the OS. The data may still sit in a
177 * writeback cache of the host OS, but it will survive a crash of the qemu
180 int coroutine_fn (*bdrv_co_flush_to_os
)(BlockDriverState
*bs
);
182 const char *protocol_name
;
183 int (*bdrv_truncate
)(BlockDriverState
*bs
, int64_t offset
);
185 int64_t (*bdrv_getlength
)(BlockDriverState
*bs
);
186 bool has_variable_length
;
187 int64_t (*bdrv_get_allocated_file_size
)(BlockDriverState
*bs
);
189 int (*bdrv_write_compressed
)(BlockDriverState
*bs
, int64_t sector_num
,
190 const uint8_t *buf
, int nb_sectors
);
192 int (*bdrv_snapshot_create
)(BlockDriverState
*bs
,
193 QEMUSnapshotInfo
*sn_info
);
194 int (*bdrv_snapshot_goto
)(BlockDriverState
*bs
,
195 const char *snapshot_id
);
196 int (*bdrv_snapshot_delete
)(BlockDriverState
*bs
,
197 const char *snapshot_id
,
200 int (*bdrv_snapshot_list
)(BlockDriverState
*bs
,
201 QEMUSnapshotInfo
**psn_info
);
202 int (*bdrv_snapshot_load_tmp
)(BlockDriverState
*bs
,
203 const char *snapshot_id
,
206 int (*bdrv_get_info
)(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
207 ImageInfoSpecific
*(*bdrv_get_specific_info
)(BlockDriverState
*bs
);
209 int (*bdrv_save_vmstate
)(BlockDriverState
*bs
, QEMUIOVector
*qiov
,
211 int (*bdrv_load_vmstate
)(BlockDriverState
*bs
, uint8_t *buf
,
212 int64_t pos
, int size
);
214 int (*bdrv_change_backing_file
)(BlockDriverState
*bs
,
215 const char *backing_file
, const char *backing_fmt
);
217 /* removable device specific */
218 int (*bdrv_is_inserted
)(BlockDriverState
*bs
);
219 int (*bdrv_media_changed
)(BlockDriverState
*bs
);
220 void (*bdrv_eject
)(BlockDriverState
*bs
, bool eject_flag
);
221 void (*bdrv_lock_medium
)(BlockDriverState
*bs
, bool locked
);
223 /* to control generic scsi devices */
224 int (*bdrv_ioctl
)(BlockDriverState
*bs
, unsigned long int req
, void *buf
);
225 BlockAIOCB
*(*bdrv_aio_ioctl
)(BlockDriverState
*bs
,
226 unsigned long int req
, void *buf
,
227 BlockCompletionFunc
*cb
, void *opaque
);
229 /* List of options for creating images, terminated by name == NULL */
230 QemuOptsList
*create_opts
;
233 * Returns 0 for completed check, -errno for internal errors.
234 * The check results are stored in result.
236 int (*bdrv_check
)(BlockDriverState
* bs
, BdrvCheckResult
*result
,
239 int (*bdrv_amend_options
)(BlockDriverState
*bs
, QemuOpts
*opts
,
240 BlockDriverAmendStatusCB
*status_cb
);
242 void (*bdrv_debug_event
)(BlockDriverState
*bs
, BlkDebugEvent event
);
244 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
245 int (*bdrv_debug_breakpoint
)(BlockDriverState
*bs
, const char *event
,
247 int (*bdrv_debug_remove_breakpoint
)(BlockDriverState
*bs
,
249 int (*bdrv_debug_resume
)(BlockDriverState
*bs
, const char *tag
);
250 bool (*bdrv_debug_is_suspended
)(BlockDriverState
*bs
, const char *tag
);
252 void (*bdrv_refresh_limits
)(BlockDriverState
*bs
, Error
**errp
);
255 * Returns 1 if newly created images are guaranteed to contain only
256 * zeros, 0 otherwise.
258 int (*bdrv_has_zero_init
)(BlockDriverState
*bs
);
260 /* Remove fd handlers, timers, and other event loop callbacks so the event
261 * loop is no longer in use. Called with no in-flight requests and in
262 * depth-first traversal order with parents before child nodes.
264 void (*bdrv_detach_aio_context
)(BlockDriverState
*bs
);
266 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
267 * can be processed again. Called with no in-flight requests and in
268 * depth-first traversal order with child nodes before parent nodes.
270 void (*bdrv_attach_aio_context
)(BlockDriverState
*bs
,
271 AioContext
*new_context
);
273 /* io queue for linux-aio */
274 void (*bdrv_io_plug
)(BlockDriverState
*bs
);
275 void (*bdrv_io_unplug
)(BlockDriverState
*bs
);
276 void (*bdrv_flush_io_queue
)(BlockDriverState
*bs
);
279 * Try to get @bs's logical and physical block size.
280 * On success, store them in @bsz and return zero.
281 * On failure, return negative errno.
283 int (*bdrv_probe_blocksizes
)(BlockDriverState
*bs
, BlockSizes
*bsz
);
285 * Try to get @bs's geometry (cyls, heads, sectors)
286 * On success, store them in @geo and return 0.
287 * On failure return -errno.
288 * Only drivers that want to override guest geometry implement this
289 * callback; see hd_geometry_guess().
291 int (*bdrv_probe_geometry
)(BlockDriverState
*bs
, HDGeometry
*geo
);
293 QLIST_ENTRY(BlockDriver
) list
;
296 typedef struct BlockLimits
{
297 /* maximum number of sectors that can be discarded at once */
300 /* optimal alignment for discard requests in sectors */
301 int64_t discard_alignment
;
303 /* maximum number of sectors that can zeroized at once */
304 int max_write_zeroes
;
306 /* optimal alignment for write zeroes requests in sectors */
307 int64_t write_zeroes_alignment
;
309 /* optimal transfer length in sectors */
310 int opt_transfer_length
;
312 /* maximal transfer length in sectors */
313 int max_transfer_length
;
315 /* memory alignment so that no bounce buffer is needed */
316 size_t min_mem_alignment
;
318 /* memory alignment for bounce buffer */
319 size_t opt_mem_alignment
;
322 typedef struct BdrvOpBlocker BdrvOpBlocker
;
324 typedef struct BdrvAioNotifier
{
325 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
);
326 void (*detach_aio_context
)(void *opaque
);
330 QLIST_ENTRY(BdrvAioNotifier
) list
;
334 * Note: the function bdrv_append() copies and swaps contents of
335 * BlockDriverStates, so if you add new fields to this struct, please
336 * inspect bdrv_append() to determine if the new fields need to be
339 struct BlockDriverState
{
340 int64_t total_sectors
; /* if we are reading a disk image, give its
342 int read_only
; /* if true, the media is read only */
343 int open_flags
; /* flags used to open the file, re-used for re-open */
344 int encrypted
; /* if true, the media is encrypted */
345 int valid_key
; /* if true, a valid encryption key has been set */
346 int sg
; /* if true, the device is a /dev/sg* */
347 int copy_on_read
; /* if true, copy read backing sectors into image
348 note this is a reference count */
351 BlockDriver
*drv
; /* NULL means no media */
354 BlockBackend
*blk
; /* owning backend, if any */
356 AioContext
*aio_context
; /* event loop used for fd handlers, timers, etc */
357 /* long-running tasks intended to always use the same AioContext as this
358 * BDS may register themselves in this list to be notified of changes
359 * regarding this BDS's context */
360 QLIST_HEAD(, BdrvAioNotifier
) aio_notifiers
;
362 char filename
[PATH_MAX
];
363 char backing_file
[PATH_MAX
]; /* if non zero, the image is a diff of
365 char backing_format
[16]; /* if non-zero and backing_file exists */
367 QDict
*full_open_options
;
368 char exact_filename
[PATH_MAX
];
370 BlockDriverState
*backing_hd
;
371 BlockDriverState
*file
;
373 NotifierList close_notifiers
;
375 /* Callback before write request is processed */
376 NotifierWithReturnList before_write_notifiers
;
378 /* number of in-flight serialising requests */
379 unsigned int serialising_in_flight
;
382 CoQueue throttled_reqs
[2];
383 bool io_limits_enabled
;
384 /* The following fields are protected by the ThrottleGroup lock.
385 * See the ThrottleGroup documentation for details. */
386 ThrottleState
*throttle_state
;
387 ThrottleTimers throttle_timers
;
388 unsigned pending_reqs
[2];
389 QLIST_ENTRY(BlockDriverState
) round_robin
;
391 /* I/O stats (display with "info blockstats"). */
392 BlockAcctStats stats
;
397 /* Whether produces zeros when read beyond eof */
398 bool zero_beyond_eof
;
400 /* Alignment requirement for offset/length of I/O requests */
401 unsigned int request_alignment
;
403 /* the block size for which the guest device expects atomicity */
404 int guest_block_size
;
406 /* do we need to tell the quest if we have a volatile write cache? */
407 int enable_write_cache
;
409 /* NOTE: the following infos are only hints for real hardware
410 drivers. They are not used by the block driver */
411 BlockdevOnError on_read_error
, on_write_error
;
412 bool iostatus_enabled
;
413 BlockDeviceIoStatus iostatus
;
415 /* the following member gives a name to every node on the bs graph. */
417 /* element of the list of named nodes building the graph */
418 QTAILQ_ENTRY(BlockDriverState
) node_list
;
419 /* element of the list of "drives" the guest sees */
420 QTAILQ_ENTRY(BlockDriverState
) device_list
;
421 QLIST_HEAD(, BdrvDirtyBitmap
) dirty_bitmaps
;
424 QLIST_HEAD(, BdrvTrackedRequest
) tracked_requests
;
426 /* operation blockers */
427 QLIST_HEAD(, BdrvOpBlocker
) op_blockers
[BLOCK_OP_TYPE_MAX
];
429 /* long-running background operation */
433 BlockdevDetectZeroesOptions detect_zeroes
;
435 /* The error object in use for blocking operations on backing_hd */
436 Error
*backing_blocker
;
438 /* threshold limit for writes, in bytes. "High water mark". */
439 uint64_t write_threshold_offset
;
440 NotifierWithReturn write_threshold_notifier
;
444 /* Essential block drivers which must always be statically linked into qemu, and
445 * which therefore can be accessed without using bdrv_find_format() */
446 extern BlockDriver bdrv_file
;
447 extern BlockDriver bdrv_raw
;
448 extern BlockDriver bdrv_qcow2
;
451 * bdrv_setup_io_funcs:
453 * Prepare a #BlockDriver for I/O request processing by populating
454 * unimplemented coroutine and AIO interfaces with generic wrapper functions
455 * that fall back to implemented interfaces.
457 void bdrv_setup_io_funcs(BlockDriver
*bdrv
);
459 int get_tmp_filename(char *filename
, int size
);
460 BlockDriver
*bdrv_probe_all(const uint8_t *buf
, int buf_size
,
461 const char *filename
);
463 void bdrv_set_io_limits(BlockDriverState
*bs
,
464 ThrottleConfig
*cfg
);
468 * bdrv_add_before_write_notifier:
470 * Register a callback that is invoked before write requests are processed but
471 * after any throttling or waiting for overlapping requests.
473 void bdrv_add_before_write_notifier(BlockDriverState
*bs
,
474 NotifierWithReturn
*notifier
);
477 * bdrv_detach_aio_context:
479 * May be called from .bdrv_detach_aio_context() to detach children from the
480 * current #AioContext. This is only needed by block drivers that manage their
481 * own children. Both ->file and ->backing_hd are automatically handled and
482 * block drivers should not call this function on them explicitly.
484 void bdrv_detach_aio_context(BlockDriverState
*bs
);
487 * bdrv_attach_aio_context:
489 * May be called from .bdrv_attach_aio_context() to attach children to the new
490 * #AioContext. This is only needed by block drivers that manage their own
491 * children. Both ->file and ->backing_hd are automatically handled and block
492 * drivers should not call this function on them explicitly.
494 void bdrv_attach_aio_context(BlockDriverState
*bs
,
495 AioContext
*new_context
);
498 * bdrv_add_aio_context_notifier:
500 * If a long-running job intends to be always run in the same AioContext as a
501 * certain BDS, it may use this function to be notified of changes regarding the
502 * association of the BDS to an AioContext.
504 * attached_aio_context() is called after the target BDS has been attached to a
505 * new AioContext; detach_aio_context() is called before the target BDS is being
506 * detached from its old AioContext.
508 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
509 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
510 void (*detach_aio_context
)(void *opaque
), void *opaque
);
513 * bdrv_remove_aio_context_notifier:
515 * Unsubscribe of change notifications regarding the BDS's AioContext. The
516 * parameters given here have to be the same as those given to
517 * bdrv_add_aio_context_notifier().
519 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
520 void (*aio_context_attached
)(AioContext
*,
522 void (*aio_context_detached
)(void *),
526 int is_windows_drive(const char *filename
);
531 * @bs: Block device to operate on.
532 * @base: Block device that will become the new base, or %NULL to
533 * flatten the whole backing file chain onto @bs.
534 * @base_id: The file name that will be written to @bs as the new
535 * backing file if the job completes. Ignored if @base is %NULL.
536 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
537 * @on_error: The action to take upon error.
538 * @cb: Completion function for the job.
539 * @opaque: Opaque pointer value passed to @cb.
540 * @errp: Error object.
542 * Start a streaming operation on @bs. Clusters that are unallocated
543 * in @bs, but allocated in any image between @base and @bs (both
544 * exclusive) will be written to @bs. At the end of a successful
545 * streaming job, the backing file of @bs will be changed to
546 * @base_id in the written image and to @base in the live BlockDriverState.
548 void stream_start(BlockDriverState
*bs
, BlockDriverState
*base
,
549 const char *base_id
, int64_t speed
, BlockdevOnError on_error
,
550 BlockCompletionFunc
*cb
,
551 void *opaque
, Error
**errp
);
555 * @bs: Active block device.
556 * @top: Top block device to be committed.
557 * @base: Block device that will be written into, and become the new top.
558 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
559 * @on_error: The action to take upon error.
560 * @cb: Completion function for the job.
561 * @opaque: Opaque pointer value passed to @cb.
562 * @backing_file_str: String to use as the backing file in @top's overlay
563 * @errp: Error object.
566 void commit_start(BlockDriverState
*bs
, BlockDriverState
*base
,
567 BlockDriverState
*top
, int64_t speed
,
568 BlockdevOnError on_error
, BlockCompletionFunc
*cb
,
569 void *opaque
, const char *backing_file_str
, Error
**errp
);
571 * commit_active_start:
572 * @bs: Active block device to be committed.
573 * @base: Block device that will be written into, and become the new top.
574 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
575 * @on_error: The action to take upon error.
576 * @cb: Completion function for the job.
577 * @opaque: Opaque pointer value passed to @cb.
578 * @errp: Error object.
581 void commit_active_start(BlockDriverState
*bs
, BlockDriverState
*base
,
583 BlockdevOnError on_error
,
584 BlockCompletionFunc
*cb
,
585 void *opaque
, Error
**errp
);
588 * @bs: Block device to operate on.
589 * @target: Block device to write to.
590 * @replaces: Block graph node name to replace once the mirror is done. Can
591 * only be used when full mirroring is selected.
592 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
593 * @granularity: The chosen granularity for the dirty bitmap.
594 * @buf_size: The amount of data that can be in flight at one time.
595 * @mode: Whether to collapse all images in the chain to the target.
596 * @on_source_error: The action to take upon error reading from the source.
597 * @on_target_error: The action to take upon error writing to the target.
598 * @cb: Completion function for the job.
599 * @opaque: Opaque pointer value passed to @cb.
600 * @errp: Error object.
602 * Start a mirroring operation on @bs. Clusters that are allocated
603 * in @bs will be written to @bs until the job is cancelled or
604 * manually completed. At the end of a successful mirroring job,
605 * @bs will be switched to read from @target.
607 void mirror_start(BlockDriverState
*bs
, BlockDriverState
*target
,
608 const char *replaces
,
609 int64_t speed
, uint32_t granularity
, int64_t buf_size
,
610 MirrorSyncMode mode
, BlockdevOnError on_source_error
,
611 BlockdevOnError on_target_error
,
612 BlockCompletionFunc
*cb
,
613 void *opaque
, Error
**errp
);
617 * @bs: Block device to operate on.
618 * @target: Block device to write to.
619 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
620 * @sync_mode: What parts of the disk image should be copied to the destination.
621 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_DIRTY_BITMAP.
622 * @on_source_error: The action to take upon error reading from the source.
623 * @on_target_error: The action to take upon error writing to the target.
624 * @cb: Completion function for the job.
625 * @opaque: Opaque pointer value passed to @cb.
627 * Start a backup operation on @bs. Clusters in @bs are written to @target
628 * until the job is cancelled or manually completed.
630 void backup_start(BlockDriverState
*bs
, BlockDriverState
*target
,
631 int64_t speed
, MirrorSyncMode sync_mode
,
632 BdrvDirtyBitmap
*sync_bitmap
,
633 BlockdevOnError on_source_error
,
634 BlockdevOnError on_target_error
,
635 BlockCompletionFunc
*cb
, void *opaque
,
638 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
);
639 bool blk_dev_has_removable_media(BlockBackend
*blk
);
640 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
641 bool blk_dev_is_tray_open(BlockBackend
*blk
);
642 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
643 void blk_dev_resize_cb(BlockBackend
*blk
);
645 void bdrv_set_dirty(BlockDriverState
*bs
, int64_t cur_sector
, int nr_sectors
);
646 void bdrv_reset_dirty(BlockDriverState
*bs
, int64_t cur_sector
,
649 #endif /* BLOCK_INT_H */