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 "qemu/coroutine.h"
32 #include "qemu/timer.h"
33 #include "qapi-types.h"
34 #include "qemu/hbitmap.h"
35 #include "block/snapshot.h"
36 #include "qemu/main-loop.h"
37 #include "qemu/throttle.h"
39 #define BLOCK_FLAG_ENCRYPT 1
40 #define BLOCK_FLAG_COMPAT6 4
41 #define BLOCK_FLAG_LAZY_REFCOUNTS 8
43 #define BLOCK_OPT_SIZE "size"
44 #define BLOCK_OPT_ENCRYPT "encryption"
45 #define BLOCK_OPT_COMPAT6 "compat6"
46 #define BLOCK_OPT_BACKING_FILE "backing_file"
47 #define BLOCK_OPT_BACKING_FMT "backing_fmt"
48 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
49 #define BLOCK_OPT_TABLE_SIZE "table_size"
50 #define BLOCK_OPT_PREALLOC "preallocation"
51 #define BLOCK_OPT_SUBFMT "subformat"
52 #define BLOCK_OPT_COMPAT_LEVEL "compat"
53 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
54 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
55 #define BLOCK_OPT_REDUNDANCY "redundancy"
56 #define BLOCK_OPT_NOCOW "nocow"
57 #define BLOCK_OPT_OBJECT_SIZE "object_size"
58 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
60 #define BLOCK_PROBE_BUF_SIZE 512
62 typedef struct BdrvTrackedRequest
{
69 int64_t overlap_offset
;
70 unsigned int overlap_bytes
;
72 QLIST_ENTRY(BdrvTrackedRequest
) list
;
73 Coroutine
*co
; /* owner, used for deadlock detection */
74 CoQueue wait_queue
; /* coroutines blocked on this request */
76 struct BdrvTrackedRequest
*waiting_for
;
80 const char *format_name
;
83 /* set to true if the BlockDriver is a block filter */
85 /* for snapshots block filter like Quorum can implement the
86 * following recursive callback.
87 * It's purpose is to recurse on the filter children while calling
88 * bdrv_recurse_is_first_non_filter on them.
89 * For a sample implementation look in the future Quorum block filter.
91 bool (*bdrv_recurse_is_first_non_filter
)(BlockDriverState
*bs
,
92 BlockDriverState
*candidate
);
94 int (*bdrv_probe
)(const uint8_t *buf
, int buf_size
, const char *filename
);
95 int (*bdrv_probe_device
)(const char *filename
);
97 /* Any driver implementing this callback is expected to be able to handle
98 * NULL file names in its .bdrv_open() implementation */
99 void (*bdrv_parse_filename
)(const char *filename
, QDict
*options
, Error
**errp
);
100 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
101 * this field set to true, except ones that are defined only by their
103 * An example of the last type will be the quorum block driver.
105 bool bdrv_needs_filename
;
107 /* Set if a driver can support backing files */
108 bool supports_backing
;
110 /* For handling image reopen for split or non-split files */
111 int (*bdrv_reopen_prepare
)(BDRVReopenState
*reopen_state
,
112 BlockReopenQueue
*queue
, Error
**errp
);
113 void (*bdrv_reopen_commit
)(BDRVReopenState
*reopen_state
);
114 void (*bdrv_reopen_abort
)(BDRVReopenState
*reopen_state
);
116 int (*bdrv_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
118 int (*bdrv_file_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
120 int (*bdrv_read
)(BlockDriverState
*bs
, int64_t sector_num
,
121 uint8_t *buf
, int nb_sectors
);
122 int (*bdrv_write
)(BlockDriverState
*bs
, int64_t sector_num
,
123 const uint8_t *buf
, int nb_sectors
);
124 void (*bdrv_close
)(BlockDriverState
*bs
);
125 int (*bdrv_create
)(const char *filename
, QemuOpts
*opts
, Error
**errp
);
126 int (*bdrv_set_key
)(BlockDriverState
*bs
, const char *key
);
127 int (*bdrv_make_empty
)(BlockDriverState
*bs
);
129 void (*bdrv_refresh_filename
)(BlockDriverState
*bs
);
132 BlockAIOCB
*(*bdrv_aio_readv
)(BlockDriverState
*bs
,
133 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
134 BlockCompletionFunc
*cb
, void *opaque
);
135 BlockAIOCB
*(*bdrv_aio_writev
)(BlockDriverState
*bs
,
136 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
137 BlockCompletionFunc
*cb
, void *opaque
);
138 BlockAIOCB
*(*bdrv_aio_flush
)(BlockDriverState
*bs
,
139 BlockCompletionFunc
*cb
, void *opaque
);
140 BlockAIOCB
*(*bdrv_aio_discard
)(BlockDriverState
*bs
,
141 int64_t sector_num
, int nb_sectors
,
142 BlockCompletionFunc
*cb
, void *opaque
);
144 int coroutine_fn (*bdrv_co_readv
)(BlockDriverState
*bs
,
145 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
146 int coroutine_fn (*bdrv_co_writev
)(BlockDriverState
*bs
,
147 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
149 * Efficiently zero a region of the disk image. Typically an image format
150 * would use a compact metadata representation to implement this. This
151 * function pointer may be NULL and .bdrv_co_writev() will be called
154 int coroutine_fn (*bdrv_co_write_zeroes
)(BlockDriverState
*bs
,
155 int64_t sector_num
, int nb_sectors
, BdrvRequestFlags flags
);
156 int coroutine_fn (*bdrv_co_discard
)(BlockDriverState
*bs
,
157 int64_t sector_num
, int nb_sectors
);
158 int64_t coroutine_fn (*bdrv_co_get_block_status
)(BlockDriverState
*bs
,
159 int64_t sector_num
, int nb_sectors
, int *pnum
);
162 * Invalidate any cached meta-data.
164 void (*bdrv_invalidate_cache
)(BlockDriverState
*bs
, Error
**errp
);
167 * Flushes all data that was already written to the OS all the way down to
168 * the disk (for example raw-posix calls fsync()).
170 int coroutine_fn (*bdrv_co_flush_to_disk
)(BlockDriverState
*bs
);
173 * Flushes all internal caches to the OS. The data may still sit in a
174 * writeback cache of the host OS, but it will survive a crash of the qemu
177 int coroutine_fn (*bdrv_co_flush_to_os
)(BlockDriverState
*bs
);
179 const char *protocol_name
;
180 int (*bdrv_truncate
)(BlockDriverState
*bs
, int64_t offset
);
182 int64_t (*bdrv_getlength
)(BlockDriverState
*bs
);
183 bool has_variable_length
;
184 int64_t (*bdrv_get_allocated_file_size
)(BlockDriverState
*bs
);
186 int (*bdrv_write_compressed
)(BlockDriverState
*bs
, int64_t sector_num
,
187 const uint8_t *buf
, int nb_sectors
);
189 int (*bdrv_snapshot_create
)(BlockDriverState
*bs
,
190 QEMUSnapshotInfo
*sn_info
);
191 int (*bdrv_snapshot_goto
)(BlockDriverState
*bs
,
192 const char *snapshot_id
);
193 int (*bdrv_snapshot_delete
)(BlockDriverState
*bs
,
194 const char *snapshot_id
,
197 int (*bdrv_snapshot_list
)(BlockDriverState
*bs
,
198 QEMUSnapshotInfo
**psn_info
);
199 int (*bdrv_snapshot_load_tmp
)(BlockDriverState
*bs
,
200 const char *snapshot_id
,
203 int (*bdrv_get_info
)(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
204 ImageInfoSpecific
*(*bdrv_get_specific_info
)(BlockDriverState
*bs
);
206 int (*bdrv_save_vmstate
)(BlockDriverState
*bs
, QEMUIOVector
*qiov
,
208 int (*bdrv_load_vmstate
)(BlockDriverState
*bs
, uint8_t *buf
,
209 int64_t pos
, int size
);
211 int (*bdrv_change_backing_file
)(BlockDriverState
*bs
,
212 const char *backing_file
, const char *backing_fmt
);
214 /* removable device specific */
215 bool (*bdrv_is_inserted
)(BlockDriverState
*bs
);
216 int (*bdrv_media_changed
)(BlockDriverState
*bs
);
217 void (*bdrv_eject
)(BlockDriverState
*bs
, bool eject_flag
);
218 void (*bdrv_lock_medium
)(BlockDriverState
*bs
, bool locked
);
220 /* to control generic scsi devices */
221 int (*bdrv_ioctl
)(BlockDriverState
*bs
, unsigned long int req
, void *buf
);
222 BlockAIOCB
*(*bdrv_aio_ioctl
)(BlockDriverState
*bs
,
223 unsigned long int req
, void *buf
,
224 BlockCompletionFunc
*cb
, void *opaque
);
226 /* List of options for creating images, terminated by name == NULL */
227 QemuOptsList
*create_opts
;
230 * Returns 0 for completed check, -errno for internal errors.
231 * The check results are stored in result.
233 int (*bdrv_check
)(BlockDriverState
* bs
, BdrvCheckResult
*result
,
236 int (*bdrv_amend_options
)(BlockDriverState
*bs
, QemuOpts
*opts
,
237 BlockDriverAmendStatusCB
*status_cb
);
239 void (*bdrv_debug_event
)(BlockDriverState
*bs
, BlkDebugEvent event
);
241 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
242 int (*bdrv_debug_breakpoint
)(BlockDriverState
*bs
, const char *event
,
244 int (*bdrv_debug_remove_breakpoint
)(BlockDriverState
*bs
,
246 int (*bdrv_debug_resume
)(BlockDriverState
*bs
, const char *tag
);
247 bool (*bdrv_debug_is_suspended
)(BlockDriverState
*bs
, const char *tag
);
249 void (*bdrv_refresh_limits
)(BlockDriverState
*bs
, Error
**errp
);
252 * Returns 1 if newly created images are guaranteed to contain only
253 * zeros, 0 otherwise.
255 int (*bdrv_has_zero_init
)(BlockDriverState
*bs
);
257 /* Remove fd handlers, timers, and other event loop callbacks so the event
258 * loop is no longer in use. Called with no in-flight requests and in
259 * depth-first traversal order with parents before child nodes.
261 void (*bdrv_detach_aio_context
)(BlockDriverState
*bs
);
263 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
264 * can be processed again. Called with no in-flight requests and in
265 * depth-first traversal order with child nodes before parent nodes.
267 void (*bdrv_attach_aio_context
)(BlockDriverState
*bs
,
268 AioContext
*new_context
);
270 /* io queue for linux-aio */
271 void (*bdrv_io_plug
)(BlockDriverState
*bs
);
272 void (*bdrv_io_unplug
)(BlockDriverState
*bs
);
273 void (*bdrv_flush_io_queue
)(BlockDriverState
*bs
);
276 * Try to get @bs's logical and physical block size.
277 * On success, store them in @bsz and return zero.
278 * On failure, return negative errno.
280 int (*bdrv_probe_blocksizes
)(BlockDriverState
*bs
, BlockSizes
*bsz
);
282 * Try to get @bs's geometry (cyls, heads, sectors)
283 * On success, store them in @geo and return 0.
284 * On failure return -errno.
285 * Only drivers that want to override guest geometry implement this
286 * callback; see hd_geometry_guess().
288 int (*bdrv_probe_geometry
)(BlockDriverState
*bs
, HDGeometry
*geo
);
290 QLIST_ENTRY(BlockDriver
) list
;
293 typedef struct BlockLimits
{
294 /* maximum number of sectors that can be discarded at once */
297 /* optimal alignment for discard requests in sectors */
298 int64_t discard_alignment
;
300 /* maximum number of sectors that can zeroized at once */
301 int max_write_zeroes
;
303 /* optimal alignment for write zeroes requests in sectors */
304 int64_t write_zeroes_alignment
;
306 /* optimal transfer length in sectors */
307 int opt_transfer_length
;
309 /* maximal transfer length in sectors */
310 int max_transfer_length
;
312 /* memory alignment so that no bounce buffer is needed */
313 size_t min_mem_alignment
;
315 /* memory alignment for bounce buffer */
316 size_t opt_mem_alignment
;
319 typedef struct BdrvOpBlocker BdrvOpBlocker
;
321 typedef struct BdrvAioNotifier
{
322 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
);
323 void (*detach_aio_context
)(void *opaque
);
327 QLIST_ENTRY(BdrvAioNotifier
) list
;
330 struct BdrvChildRole
{
331 int (*inherit_flags
)(int parent_flags
);
334 extern const BdrvChildRole child_file
;
335 extern const BdrvChildRole child_format
;
338 BlockDriverState
*bs
;
339 const BdrvChildRole
*role
;
340 QLIST_ENTRY(BdrvChild
) next
;
341 QLIST_ENTRY(BdrvChild
) next_parent
;
345 * Note: the function bdrv_append() copies and swaps contents of
346 * BlockDriverStates, so if you add new fields to this struct, please
347 * inspect bdrv_append() to determine if the new fields need to be
350 struct BlockDriverState
{
351 int64_t total_sectors
; /* if we are reading a disk image, give its
353 int read_only
; /* if true, the media is read only */
354 int open_flags
; /* flags used to open the file, re-used for re-open */
355 int encrypted
; /* if true, the media is encrypted */
356 int valid_key
; /* if true, a valid encryption key has been set */
357 int sg
; /* if true, the device is a /dev/sg* */
358 int copy_on_read
; /* if true, copy read backing sectors into image
359 note this is a reference count */
362 BlockDriver
*drv
; /* NULL means no media */
365 BlockBackend
*blk
; /* owning backend, if any */
367 AioContext
*aio_context
; /* event loop used for fd handlers, timers, etc */
368 /* long-running tasks intended to always use the same AioContext as this
369 * BDS may register themselves in this list to be notified of changes
370 * regarding this BDS's context */
371 QLIST_HEAD(, BdrvAioNotifier
) aio_notifiers
;
373 char filename
[PATH_MAX
];
374 char backing_file
[PATH_MAX
]; /* if non zero, the image is a diff of
376 char backing_format
[16]; /* if non-zero and backing_file exists */
378 QDict
*full_open_options
;
379 char exact_filename
[PATH_MAX
];
384 NotifierList close_notifiers
;
386 /* Callback before write request is processed */
387 NotifierWithReturnList before_write_notifiers
;
389 /* number of in-flight serialising requests */
390 unsigned int serialising_in_flight
;
393 CoQueue throttled_reqs
[2];
394 bool io_limits_enabled
;
395 /* The following fields are protected by the ThrottleGroup lock.
396 * See the ThrottleGroup documentation for details. */
397 ThrottleState
*throttle_state
;
398 ThrottleTimers throttle_timers
;
399 unsigned pending_reqs
[2];
400 QLIST_ENTRY(BlockDriverState
) round_robin
;
402 /* Offset after the highest byte written to */
403 uint64_t wr_highest_offset
;
408 /* Whether produces zeros when read beyond eof */
409 bool zero_beyond_eof
;
411 /* Alignment requirement for offset/length of I/O requests */
412 unsigned int request_alignment
;
414 /* do we need to tell the quest if we have a volatile write cache? */
415 int enable_write_cache
;
417 /* the following member gives a name to every node on the bs graph. */
419 /* element of the list of named nodes building the graph */
420 QTAILQ_ENTRY(BlockDriverState
) node_list
;
421 /* element of the list of "drives" the guest sees */
422 QTAILQ_ENTRY(BlockDriverState
) device_list
;
423 QLIST_HEAD(, BdrvDirtyBitmap
) dirty_bitmaps
;
426 QLIST_HEAD(, BdrvTrackedRequest
) tracked_requests
;
428 /* operation blockers */
429 QLIST_HEAD(, BdrvOpBlocker
) op_blockers
[BLOCK_OP_TYPE_MAX
];
431 /* long-running background operation */
434 /* The node that this node inherited default options from (and a reopen on
435 * which can affect this node by changing these defaults). This is always a
436 * parent node of this node. */
437 BlockDriverState
*inherits_from
;
438 QLIST_HEAD(, BdrvChild
) children
;
439 QLIST_HEAD(, BdrvChild
) parents
;
442 BlockdevDetectZeroesOptions detect_zeroes
;
444 /* The error object in use for blocking operations on backing_hd */
445 Error
*backing_blocker
;
447 /* threshold limit for writes, in bytes. "High water mark". */
448 uint64_t write_threshold_offset
;
449 NotifierWithReturn write_threshold_notifier
;
452 static inline BlockDriverState
*backing_bs(BlockDriverState
*bs
)
454 return bs
->backing
? bs
->backing
->bs
: NULL
;
458 /* Essential block drivers which must always be statically linked into qemu, and
459 * which therefore can be accessed without using bdrv_find_format() */
460 extern BlockDriver bdrv_file
;
461 extern BlockDriver bdrv_raw
;
462 extern BlockDriver bdrv_qcow2
;
465 * bdrv_setup_io_funcs:
467 * Prepare a #BlockDriver for I/O request processing by populating
468 * unimplemented coroutine and AIO interfaces with generic wrapper functions
469 * that fall back to implemented interfaces.
471 void bdrv_setup_io_funcs(BlockDriver
*bdrv
);
473 int get_tmp_filename(char *filename
, int size
);
474 BlockDriver
*bdrv_probe_all(const uint8_t *buf
, int buf_size
,
475 const char *filename
);
477 void bdrv_set_io_limits(BlockDriverState
*bs
,
478 ThrottleConfig
*cfg
);
482 * bdrv_add_before_write_notifier:
484 * Register a callback that is invoked before write requests are processed but
485 * after any throttling or waiting for overlapping requests.
487 void bdrv_add_before_write_notifier(BlockDriverState
*bs
,
488 NotifierWithReturn
*notifier
);
491 * bdrv_detach_aio_context:
493 * May be called from .bdrv_detach_aio_context() to detach children from the
494 * current #AioContext. This is only needed by block drivers that manage their
495 * own children. Both ->file and ->backing are automatically handled and
496 * block drivers should not call this function on them explicitly.
498 void bdrv_detach_aio_context(BlockDriverState
*bs
);
501 * bdrv_attach_aio_context:
503 * May be called from .bdrv_attach_aio_context() to attach children to the new
504 * #AioContext. This is only needed by block drivers that manage their own
505 * children. Both ->file and ->backing are automatically handled and block
506 * drivers should not call this function on them explicitly.
508 void bdrv_attach_aio_context(BlockDriverState
*bs
,
509 AioContext
*new_context
);
512 * bdrv_add_aio_context_notifier:
514 * If a long-running job intends to be always run in the same AioContext as a
515 * certain BDS, it may use this function to be notified of changes regarding the
516 * association of the BDS to an AioContext.
518 * attached_aio_context() is called after the target BDS has been attached to a
519 * new AioContext; detach_aio_context() is called before the target BDS is being
520 * detached from its old AioContext.
522 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
523 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
524 void (*detach_aio_context
)(void *opaque
), void *opaque
);
527 * bdrv_remove_aio_context_notifier:
529 * Unsubscribe of change notifications regarding the BDS's AioContext. The
530 * parameters given here have to be the same as those given to
531 * bdrv_add_aio_context_notifier().
533 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
534 void (*aio_context_attached
)(AioContext
*,
536 void (*aio_context_detached
)(void *),
540 int is_windows_drive(const char *filename
);
545 * @bs: Block device to operate on.
546 * @base: Block device that will become the new base, or %NULL to
547 * flatten the whole backing file chain onto @bs.
548 * @base_id: The file name that will be written to @bs as the new
549 * backing file if the job completes. Ignored if @base is %NULL.
550 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
551 * @on_error: The action to take upon error.
552 * @cb: Completion function for the job.
553 * @opaque: Opaque pointer value passed to @cb.
554 * @errp: Error object.
556 * Start a streaming operation on @bs. Clusters that are unallocated
557 * in @bs, but allocated in any image between @base and @bs (both
558 * exclusive) will be written to @bs. At the end of a successful
559 * streaming job, the backing file of @bs will be changed to
560 * @base_id in the written image and to @base in the live BlockDriverState.
562 void stream_start(BlockDriverState
*bs
, BlockDriverState
*base
,
563 const char *base_id
, int64_t speed
, BlockdevOnError on_error
,
564 BlockCompletionFunc
*cb
,
565 void *opaque
, Error
**errp
);
569 * @bs: Active block device.
570 * @top: Top block device to be committed.
571 * @base: Block device that will be written into, and become the new top.
572 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
573 * @on_error: The action to take upon error.
574 * @cb: Completion function for the job.
575 * @opaque: Opaque pointer value passed to @cb.
576 * @backing_file_str: String to use as the backing file in @top's overlay
577 * @errp: Error object.
580 void commit_start(BlockDriverState
*bs
, BlockDriverState
*base
,
581 BlockDriverState
*top
, int64_t speed
,
582 BlockdevOnError on_error
, BlockCompletionFunc
*cb
,
583 void *opaque
, const char *backing_file_str
, Error
**errp
);
585 * commit_active_start:
586 * @bs: Active block device to be committed.
587 * @base: Block device that will be written into, and become the new top.
588 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
589 * @on_error: The action to take upon error.
590 * @cb: Completion function for the job.
591 * @opaque: Opaque pointer value passed to @cb.
592 * @errp: Error object.
595 void commit_active_start(BlockDriverState
*bs
, BlockDriverState
*base
,
597 BlockdevOnError on_error
,
598 BlockCompletionFunc
*cb
,
599 void *opaque
, Error
**errp
);
602 * @bs: Block device to operate on.
603 * @target: Block device to write to.
604 * @replaces: Block graph node name to replace once the mirror is done. Can
605 * only be used when full mirroring is selected.
606 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
607 * @granularity: The chosen granularity for the dirty bitmap.
608 * @buf_size: The amount of data that can be in flight at one time.
609 * @mode: Whether to collapse all images in the chain to the target.
610 * @on_source_error: The action to take upon error reading from the source.
611 * @on_target_error: The action to take upon error writing to the target.
612 * @unmap: Whether to unmap target where source sectors only contain zeroes.
613 * @cb: Completion function for the job.
614 * @opaque: Opaque pointer value passed to @cb.
615 * @errp: Error object.
617 * Start a mirroring operation on @bs. Clusters that are allocated
618 * in @bs will be written to @bs until the job is cancelled or
619 * manually completed. At the end of a successful mirroring job,
620 * @bs will be switched to read from @target.
622 void mirror_start(BlockDriverState
*bs
, BlockDriverState
*target
,
623 const char *replaces
,
624 int64_t speed
, uint32_t granularity
, int64_t buf_size
,
625 MirrorSyncMode mode
, BlockdevOnError on_source_error
,
626 BlockdevOnError on_target_error
,
628 BlockCompletionFunc
*cb
,
629 void *opaque
, Error
**errp
);
633 * @bs: Block device to operate on.
634 * @target: Block device to write to.
635 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
636 * @sync_mode: What parts of the disk image should be copied to the destination.
637 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
638 * @on_source_error: The action to take upon error reading from the source.
639 * @on_target_error: The action to take upon error writing to the target.
640 * @cb: Completion function for the job.
641 * @opaque: Opaque pointer value passed to @cb.
643 * Start a backup operation on @bs. Clusters in @bs are written to @target
644 * until the job is cancelled or manually completed.
646 void backup_start(BlockDriverState
*bs
, BlockDriverState
*target
,
647 int64_t speed
, MirrorSyncMode sync_mode
,
648 BdrvDirtyBitmap
*sync_bitmap
,
649 BlockdevOnError on_source_error
,
650 BlockdevOnError on_target_error
,
651 BlockCompletionFunc
*cb
, void *opaque
,
654 void blk_set_bs(BlockBackend
*blk
, BlockDriverState
*bs
);
656 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
);
657 bool blk_dev_has_removable_media(BlockBackend
*blk
);
658 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
659 bool blk_dev_is_tray_open(BlockBackend
*blk
);
660 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
661 void blk_dev_resize_cb(BlockBackend
*blk
);
663 void bdrv_set_dirty(BlockDriverState
*bs
, int64_t cur_sector
, int nr_sectors
);
664 bool bdrv_requests_pending(BlockDriverState
*bs
);
666 #endif /* BLOCK_INT_H */