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 "block/throttle-groups.h"
30 #include "qemu/option.h"
31 #include "qemu/queue.h"
32 #include "qemu/coroutine.h"
33 #include "qemu/timer.h"
34 #include "qapi-types.h"
35 #include "qemu/hbitmap.h"
36 #include "block/snapshot.h"
37 #include "qemu/main-loop.h"
38 #include "qemu/throttle.h"
40 #define BLOCK_FLAG_ENCRYPT 1
41 #define BLOCK_FLAG_COMPAT6 4
42 #define BLOCK_FLAG_LAZY_REFCOUNTS 8
44 #define BLOCK_OPT_SIZE "size"
45 #define BLOCK_OPT_ENCRYPT "encryption"
46 #define BLOCK_OPT_COMPAT6 "compat6"
47 #define BLOCK_OPT_BACKING_FILE "backing_file"
48 #define BLOCK_OPT_BACKING_FMT "backing_fmt"
49 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
50 #define BLOCK_OPT_TABLE_SIZE "table_size"
51 #define BLOCK_OPT_PREALLOC "preallocation"
52 #define BLOCK_OPT_SUBFMT "subformat"
53 #define BLOCK_OPT_COMPAT_LEVEL "compat"
54 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
55 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
56 #define BLOCK_OPT_REDUNDANCY "redundancy"
57 #define BLOCK_OPT_NOCOW "nocow"
58 #define BLOCK_OPT_OBJECT_SIZE "object_size"
59 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
61 #define BLOCK_PROBE_BUF_SIZE 512
63 enum BdrvTrackedRequestType
{
71 typedef struct BdrvTrackedRequest
{
75 enum BdrvTrackedRequestType type
;
78 int64_t overlap_offset
;
79 unsigned int overlap_bytes
;
81 QLIST_ENTRY(BdrvTrackedRequest
) list
;
82 Coroutine
*co
; /* owner, used for deadlock detection */
83 CoQueue wait_queue
; /* coroutines blocked on this request */
85 struct BdrvTrackedRequest
*waiting_for
;
89 const char *format_name
;
92 /* set to true if the BlockDriver is a block filter */
94 /* for snapshots block filter like Quorum can implement the
95 * following recursive callback.
96 * It's purpose is to recurse on the filter children while calling
97 * bdrv_recurse_is_first_non_filter on them.
98 * For a sample implementation look in the future Quorum block filter.
100 bool (*bdrv_recurse_is_first_non_filter
)(BlockDriverState
*bs
,
101 BlockDriverState
*candidate
);
103 int (*bdrv_probe
)(const uint8_t *buf
, int buf_size
, const char *filename
);
104 int (*bdrv_probe_device
)(const char *filename
);
106 /* Any driver implementing this callback is expected to be able to handle
107 * NULL file names in its .bdrv_open() implementation */
108 void (*bdrv_parse_filename
)(const char *filename
, QDict
*options
, Error
**errp
);
109 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
110 * this field set to true, except ones that are defined only by their
112 * An example of the last type will be the quorum block driver.
114 bool bdrv_needs_filename
;
116 /* Set if a driver can support backing files */
117 bool supports_backing
;
119 /* For handling image reopen for split or non-split files */
120 int (*bdrv_reopen_prepare
)(BDRVReopenState
*reopen_state
,
121 BlockReopenQueue
*queue
, Error
**errp
);
122 void (*bdrv_reopen_commit
)(BDRVReopenState
*reopen_state
);
123 void (*bdrv_reopen_abort
)(BDRVReopenState
*reopen_state
);
125 int (*bdrv_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
127 int (*bdrv_file_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
129 int (*bdrv_read
)(BlockDriverState
*bs
, int64_t sector_num
,
130 uint8_t *buf
, int nb_sectors
);
131 int (*bdrv_write
)(BlockDriverState
*bs
, int64_t sector_num
,
132 const uint8_t *buf
, int nb_sectors
);
133 void (*bdrv_close
)(BlockDriverState
*bs
);
134 int (*bdrv_create
)(const char *filename
, QemuOpts
*opts
, Error
**errp
);
135 int (*bdrv_set_key
)(BlockDriverState
*bs
, const char *key
);
136 int (*bdrv_make_empty
)(BlockDriverState
*bs
);
138 void (*bdrv_refresh_filename
)(BlockDriverState
*bs
);
141 BlockAIOCB
*(*bdrv_aio_readv
)(BlockDriverState
*bs
,
142 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
143 BlockCompletionFunc
*cb
, void *opaque
);
144 BlockAIOCB
*(*bdrv_aio_writev
)(BlockDriverState
*bs
,
145 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
146 BlockCompletionFunc
*cb
, void *opaque
);
147 BlockAIOCB
*(*bdrv_aio_flush
)(BlockDriverState
*bs
,
148 BlockCompletionFunc
*cb
, void *opaque
);
149 BlockAIOCB
*(*bdrv_aio_discard
)(BlockDriverState
*bs
,
150 int64_t sector_num
, int nb_sectors
,
151 BlockCompletionFunc
*cb
, void *opaque
);
153 int coroutine_fn (*bdrv_co_readv
)(BlockDriverState
*bs
,
154 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
155 int coroutine_fn (*bdrv_co_writev
)(BlockDriverState
*bs
,
156 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
158 * Efficiently zero a region of the disk image. Typically an image format
159 * would use a compact metadata representation to implement this. This
160 * function pointer may be NULL and .bdrv_co_writev() will be called
163 int coroutine_fn (*bdrv_co_write_zeroes
)(BlockDriverState
*bs
,
164 int64_t sector_num
, int nb_sectors
, BdrvRequestFlags flags
);
165 int coroutine_fn (*bdrv_co_discard
)(BlockDriverState
*bs
,
166 int64_t sector_num
, int nb_sectors
);
167 int64_t coroutine_fn (*bdrv_co_get_block_status
)(BlockDriverState
*bs
,
168 int64_t sector_num
, int nb_sectors
, int *pnum
);
171 * Invalidate any cached meta-data.
173 void (*bdrv_invalidate_cache
)(BlockDriverState
*bs
, Error
**errp
);
176 * Flushes all data that was already written to the OS all the way down to
177 * the disk (for example raw-posix calls fsync()).
179 int coroutine_fn (*bdrv_co_flush_to_disk
)(BlockDriverState
*bs
);
182 * Flushes all internal caches to the OS. The data may still sit in a
183 * writeback cache of the host OS, but it will survive a crash of the qemu
186 int coroutine_fn (*bdrv_co_flush_to_os
)(BlockDriverState
*bs
);
188 const char *protocol_name
;
189 int (*bdrv_truncate
)(BlockDriverState
*bs
, int64_t offset
);
191 int64_t (*bdrv_getlength
)(BlockDriverState
*bs
);
192 bool has_variable_length
;
193 int64_t (*bdrv_get_allocated_file_size
)(BlockDriverState
*bs
);
195 int (*bdrv_write_compressed
)(BlockDriverState
*bs
, int64_t sector_num
,
196 const uint8_t *buf
, int nb_sectors
);
198 int (*bdrv_snapshot_create
)(BlockDriverState
*bs
,
199 QEMUSnapshotInfo
*sn_info
);
200 int (*bdrv_snapshot_goto
)(BlockDriverState
*bs
,
201 const char *snapshot_id
);
202 int (*bdrv_snapshot_delete
)(BlockDriverState
*bs
,
203 const char *snapshot_id
,
206 int (*bdrv_snapshot_list
)(BlockDriverState
*bs
,
207 QEMUSnapshotInfo
**psn_info
);
208 int (*bdrv_snapshot_load_tmp
)(BlockDriverState
*bs
,
209 const char *snapshot_id
,
212 int (*bdrv_get_info
)(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
213 ImageInfoSpecific
*(*bdrv_get_specific_info
)(BlockDriverState
*bs
);
215 int (*bdrv_save_vmstate
)(BlockDriverState
*bs
, QEMUIOVector
*qiov
,
217 int (*bdrv_load_vmstate
)(BlockDriverState
*bs
, uint8_t *buf
,
218 int64_t pos
, int size
);
220 int (*bdrv_change_backing_file
)(BlockDriverState
*bs
,
221 const char *backing_file
, const char *backing_fmt
);
223 /* removable device specific */
224 bool (*bdrv_is_inserted
)(BlockDriverState
*bs
);
225 int (*bdrv_media_changed
)(BlockDriverState
*bs
);
226 void (*bdrv_eject
)(BlockDriverState
*bs
, bool eject_flag
);
227 void (*bdrv_lock_medium
)(BlockDriverState
*bs
, bool locked
);
229 /* to control generic scsi devices */
230 BlockAIOCB
*(*bdrv_aio_ioctl
)(BlockDriverState
*bs
,
231 unsigned long int req
, void *buf
,
232 BlockCompletionFunc
*cb
, void *opaque
);
234 /* List of options for creating images, terminated by name == NULL */
235 QemuOptsList
*create_opts
;
238 * Returns 0 for completed check, -errno for internal errors.
239 * The check results are stored in result.
241 int (*bdrv_check
)(BlockDriverState
* bs
, BdrvCheckResult
*result
,
244 int (*bdrv_amend_options
)(BlockDriverState
*bs
, QemuOpts
*opts
,
245 BlockDriverAmendStatusCB
*status_cb
);
247 void (*bdrv_debug_event
)(BlockDriverState
*bs
, BlkDebugEvent event
);
249 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
250 int (*bdrv_debug_breakpoint
)(BlockDriverState
*bs
, const char *event
,
252 int (*bdrv_debug_remove_breakpoint
)(BlockDriverState
*bs
,
254 int (*bdrv_debug_resume
)(BlockDriverState
*bs
, const char *tag
);
255 bool (*bdrv_debug_is_suspended
)(BlockDriverState
*bs
, const char *tag
);
257 void (*bdrv_refresh_limits
)(BlockDriverState
*bs
, Error
**errp
);
260 * Returns 1 if newly created images are guaranteed to contain only
261 * zeros, 0 otherwise.
263 int (*bdrv_has_zero_init
)(BlockDriverState
*bs
);
265 /* Remove fd handlers, timers, and other event loop callbacks so the event
266 * loop is no longer in use. Called with no in-flight requests and in
267 * depth-first traversal order with parents before child nodes.
269 void (*bdrv_detach_aio_context
)(BlockDriverState
*bs
);
271 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
272 * can be processed again. Called with no in-flight requests and in
273 * depth-first traversal order with child nodes before parent nodes.
275 void (*bdrv_attach_aio_context
)(BlockDriverState
*bs
,
276 AioContext
*new_context
);
278 /* io queue for linux-aio */
279 void (*bdrv_io_plug
)(BlockDriverState
*bs
);
280 void (*bdrv_io_unplug
)(BlockDriverState
*bs
);
281 void (*bdrv_flush_io_queue
)(BlockDriverState
*bs
);
284 * Try to get @bs's logical and physical block size.
285 * On success, store them in @bsz and return zero.
286 * On failure, return negative errno.
288 int (*bdrv_probe_blocksizes
)(BlockDriverState
*bs
, BlockSizes
*bsz
);
290 * Try to get @bs's geometry (cyls, heads, sectors)
291 * On success, store them in @geo and return 0.
292 * On failure return -errno.
293 * Only drivers that want to override guest geometry implement this
294 * callback; see hd_geometry_guess().
296 int (*bdrv_probe_geometry
)(BlockDriverState
*bs
, HDGeometry
*geo
);
298 QLIST_ENTRY(BlockDriver
) list
;
301 typedef struct BlockLimits
{
302 /* maximum number of sectors that can be discarded at once */
305 /* optimal alignment for discard requests in sectors */
306 int64_t discard_alignment
;
308 /* maximum number of sectors that can zeroized at once */
309 int max_write_zeroes
;
311 /* optimal alignment for write zeroes requests in sectors */
312 int64_t write_zeroes_alignment
;
314 /* optimal transfer length in sectors */
315 int opt_transfer_length
;
317 /* maximal transfer length in sectors */
318 int max_transfer_length
;
320 /* memory alignment so that no bounce buffer is needed */
321 size_t min_mem_alignment
;
323 /* memory alignment for bounce buffer */
324 size_t opt_mem_alignment
;
327 typedef struct BdrvOpBlocker BdrvOpBlocker
;
329 typedef struct BdrvAioNotifier
{
330 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
);
331 void (*detach_aio_context
)(void *opaque
);
335 QLIST_ENTRY(BdrvAioNotifier
) list
;
338 struct BdrvChildRole
{
339 int (*inherit_flags
)(int parent_flags
);
342 extern const BdrvChildRole child_file
;
343 extern const BdrvChildRole child_format
;
346 BlockDriverState
*bs
;
347 const BdrvChildRole
*role
;
348 QLIST_ENTRY(BdrvChild
) next
;
349 QLIST_ENTRY(BdrvChild
) next_parent
;
353 * Note: the function bdrv_append() copies and swaps contents of
354 * BlockDriverStates, so if you add new fields to this struct, please
355 * inspect bdrv_append() to determine if the new fields need to be
358 struct BlockDriverState
{
359 int64_t total_sectors
; /* if we are reading a disk image, give its
361 int read_only
; /* if true, the media is read only */
362 int open_flags
; /* flags used to open the file, re-used for re-open */
363 int encrypted
; /* if true, the media is encrypted */
364 int valid_key
; /* if true, a valid encryption key has been set */
365 int sg
; /* if true, the device is a /dev/sg* */
366 int copy_on_read
; /* if true, copy read backing sectors into image
367 note this is a reference count */
370 BlockDriver
*drv
; /* NULL means no media */
373 BlockBackend
*blk
; /* owning backend, if any */
375 AioContext
*aio_context
; /* event loop used for fd handlers, timers, etc */
376 /* long-running tasks intended to always use the same AioContext as this
377 * BDS may register themselves in this list to be notified of changes
378 * regarding this BDS's context */
379 QLIST_HEAD(, BdrvAioNotifier
) aio_notifiers
;
381 char filename
[PATH_MAX
];
382 char backing_file
[PATH_MAX
]; /* if non zero, the image is a diff of
384 char backing_format
[16]; /* if non-zero and backing_file exists */
386 QDict
*full_open_options
;
387 char exact_filename
[PATH_MAX
];
392 NotifierList close_notifiers
;
394 /* Callback before write request is processed */
395 NotifierWithReturnList before_write_notifiers
;
397 /* number of in-flight serialising requests */
398 unsigned int serialising_in_flight
;
401 * throttle_state tells us if this BDS has I/O limits configured.
402 * io_limits_enabled tells us if they are currently being
403 * enforced, but it can be temporarily set to false */
404 CoQueue throttled_reqs
[2];
405 bool io_limits_enabled
;
406 /* The following fields are protected by the ThrottleGroup lock.
407 * See the ThrottleGroup documentation for details. */
408 ThrottleState
*throttle_state
;
409 ThrottleTimers throttle_timers
;
410 unsigned pending_reqs
[2];
411 QLIST_ENTRY(BlockDriverState
) round_robin
;
413 /* Offset after the highest byte written to */
414 uint64_t wr_highest_offset
;
419 /* Whether produces zeros when read beyond eof */
420 bool zero_beyond_eof
;
422 /* Alignment requirement for offset/length of I/O requests */
423 unsigned int request_alignment
;
425 /* do we need to tell the quest if we have a volatile write cache? */
426 int enable_write_cache
;
428 /* the following member gives a name to every node on the bs graph. */
430 /* element of the list of named nodes building the graph */
431 QTAILQ_ENTRY(BlockDriverState
) node_list
;
432 /* element of the list of "drives" the guest sees */
433 QTAILQ_ENTRY(BlockDriverState
) device_list
;
434 QLIST_HEAD(, BdrvDirtyBitmap
) dirty_bitmaps
;
437 QLIST_HEAD(, BdrvTrackedRequest
) tracked_requests
;
439 /* operation blockers */
440 QLIST_HEAD(, BdrvOpBlocker
) op_blockers
[BLOCK_OP_TYPE_MAX
];
442 /* long-running background operation */
445 /* The node that this node inherited default options from (and a reopen on
446 * which can affect this node by changing these defaults). This is always a
447 * parent node of this node. */
448 BlockDriverState
*inherits_from
;
449 QLIST_HEAD(, BdrvChild
) children
;
450 QLIST_HEAD(, BdrvChild
) parents
;
453 BlockdevDetectZeroesOptions detect_zeroes
;
455 /* The error object in use for blocking operations on backing_hd */
456 Error
*backing_blocker
;
458 /* threshold limit for writes, in bytes. "High water mark". */
459 uint64_t write_threshold_offset
;
460 NotifierWithReturn write_threshold_notifier
;
465 struct BlockBackendRootState
{
468 BlockdevDetectZeroesOptions detect_zeroes
;
470 char *throttle_group
;
471 ThrottleState
*throttle_state
;
474 static inline BlockDriverState
*backing_bs(BlockDriverState
*bs
)
476 return bs
->backing
? bs
->backing
->bs
: NULL
;
480 /* Essential block drivers which must always be statically linked into qemu, and
481 * which therefore can be accessed without using bdrv_find_format() */
482 extern BlockDriver bdrv_file
;
483 extern BlockDriver bdrv_raw
;
484 extern BlockDriver bdrv_qcow2
;
486 extern QTAILQ_HEAD(BdrvStates
, BlockDriverState
) bdrv_states
;
489 * bdrv_setup_io_funcs:
491 * Prepare a #BlockDriver for I/O request processing by populating
492 * unimplemented coroutine and AIO interfaces with generic wrapper functions
493 * that fall back to implemented interfaces.
495 void bdrv_setup_io_funcs(BlockDriver
*bdrv
);
497 int get_tmp_filename(char *filename
, int size
);
498 BlockDriver
*bdrv_probe_all(const uint8_t *buf
, int buf_size
,
499 const char *filename
);
501 void bdrv_set_io_limits(BlockDriverState
*bs
,
502 ThrottleConfig
*cfg
);
506 * bdrv_add_before_write_notifier:
508 * Register a callback that is invoked before write requests are processed but
509 * after any throttling or waiting for overlapping requests.
511 void bdrv_add_before_write_notifier(BlockDriverState
*bs
,
512 NotifierWithReturn
*notifier
);
515 * bdrv_detach_aio_context:
517 * May be called from .bdrv_detach_aio_context() to detach children from the
518 * current #AioContext. This is only needed by block drivers that manage their
519 * own children. Both ->file and ->backing are automatically handled and
520 * block drivers should not call this function on them explicitly.
522 void bdrv_detach_aio_context(BlockDriverState
*bs
);
525 * bdrv_attach_aio_context:
527 * May be called from .bdrv_attach_aio_context() to attach children to the new
528 * #AioContext. This is only needed by block drivers that manage their own
529 * children. Both ->file and ->backing are automatically handled and block
530 * drivers should not call this function on them explicitly.
532 void bdrv_attach_aio_context(BlockDriverState
*bs
,
533 AioContext
*new_context
);
536 * bdrv_add_aio_context_notifier:
538 * If a long-running job intends to be always run in the same AioContext as a
539 * certain BDS, it may use this function to be notified of changes regarding the
540 * association of the BDS to an AioContext.
542 * attached_aio_context() is called after the target BDS has been attached to a
543 * new AioContext; detach_aio_context() is called before the target BDS is being
544 * detached from its old AioContext.
546 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
547 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
548 void (*detach_aio_context
)(void *opaque
), void *opaque
);
551 * bdrv_remove_aio_context_notifier:
553 * Unsubscribe of change notifications regarding the BDS's AioContext. The
554 * parameters given here have to be the same as those given to
555 * bdrv_add_aio_context_notifier().
557 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
558 void (*aio_context_attached
)(AioContext
*,
560 void (*aio_context_detached
)(void *),
564 int is_windows_drive(const char *filename
);
569 * @bs: Block device to operate on.
570 * @base: Block device that will become the new base, or %NULL to
571 * flatten the whole backing file chain onto @bs.
572 * @base_id: The file name that will be written to @bs as the new
573 * backing file if the job completes. Ignored if @base is %NULL.
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.
580 * Start a streaming operation on @bs. Clusters that are unallocated
581 * in @bs, but allocated in any image between @base and @bs (both
582 * exclusive) will be written to @bs. At the end of a successful
583 * streaming job, the backing file of @bs will be changed to
584 * @base_id in the written image and to @base in the live BlockDriverState.
586 void stream_start(BlockDriverState
*bs
, BlockDriverState
*base
,
587 const char *base_id
, int64_t speed
, BlockdevOnError on_error
,
588 BlockCompletionFunc
*cb
,
589 void *opaque
, Error
**errp
);
593 * @bs: Active block device.
594 * @top: Top block device to be committed.
595 * @base: Block device that will be written into, and become the new top.
596 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
597 * @on_error: The action to take upon error.
598 * @cb: Completion function for the job.
599 * @opaque: Opaque pointer value passed to @cb.
600 * @backing_file_str: String to use as the backing file in @top's overlay
601 * @errp: Error object.
604 void commit_start(BlockDriverState
*bs
, BlockDriverState
*base
,
605 BlockDriverState
*top
, int64_t speed
,
606 BlockdevOnError on_error
, BlockCompletionFunc
*cb
,
607 void *opaque
, const char *backing_file_str
, Error
**errp
);
609 * commit_active_start:
610 * @bs: Active block device to be committed.
611 * @base: Block device that will be written into, and become the new top.
612 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
613 * @on_error: The action to take upon error.
614 * @cb: Completion function for the job.
615 * @opaque: Opaque pointer value passed to @cb.
616 * @errp: Error object.
619 void commit_active_start(BlockDriverState
*bs
, BlockDriverState
*base
,
621 BlockdevOnError on_error
,
622 BlockCompletionFunc
*cb
,
623 void *opaque
, Error
**errp
);
626 * @bs: Block device to operate on.
627 * @target: Block device to write to.
628 * @replaces: Block graph node name to replace once the mirror is done. Can
629 * only be used when full mirroring is selected.
630 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
631 * @granularity: The chosen granularity for the dirty bitmap.
632 * @buf_size: The amount of data that can be in flight at one time.
633 * @mode: Whether to collapse all images in the chain to the target.
634 * @on_source_error: The action to take upon error reading from the source.
635 * @on_target_error: The action to take upon error writing to the target.
636 * @unmap: Whether to unmap target where source sectors only contain zeroes.
637 * @cb: Completion function for the job.
638 * @opaque: Opaque pointer value passed to @cb.
639 * @errp: Error object.
641 * Start a mirroring operation on @bs. Clusters that are allocated
642 * in @bs will be written to @bs until the job is cancelled or
643 * manually completed. At the end of a successful mirroring job,
644 * @bs will be switched to read from @target.
646 void mirror_start(BlockDriverState
*bs
, BlockDriverState
*target
,
647 const char *replaces
,
648 int64_t speed
, uint32_t granularity
, int64_t buf_size
,
649 MirrorSyncMode mode
, BlockdevOnError on_source_error
,
650 BlockdevOnError on_target_error
,
652 BlockCompletionFunc
*cb
,
653 void *opaque
, Error
**errp
);
657 * @bs: Block device to operate on.
658 * @target: Block device to write to.
659 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
660 * @sync_mode: What parts of the disk image should be copied to the destination.
661 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
662 * @on_source_error: The action to take upon error reading from the source.
663 * @on_target_error: The action to take upon error writing to the target.
664 * @cb: Completion function for the job.
665 * @opaque: Opaque pointer value passed to @cb.
667 * Start a backup operation on @bs. Clusters in @bs are written to @target
668 * until the job is cancelled or manually completed.
670 void backup_start(BlockDriverState
*bs
, BlockDriverState
*target
,
671 int64_t speed
, MirrorSyncMode sync_mode
,
672 BdrvDirtyBitmap
*sync_bitmap
,
673 BlockdevOnError on_source_error
,
674 BlockdevOnError on_target_error
,
675 BlockCompletionFunc
*cb
, void *opaque
,
678 void blk_set_bs(BlockBackend
*blk
, BlockDriverState
*bs
);
680 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
);
681 bool blk_dev_has_removable_media(BlockBackend
*blk
);
682 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
683 bool blk_dev_is_tray_open(BlockBackend
*blk
);
684 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
685 void blk_dev_resize_cb(BlockBackend
*blk
);
687 void bdrv_set_dirty(BlockDriverState
*bs
, int64_t cur_sector
, int nr_sectors
);
688 bool bdrv_requests_pending(BlockDriverState
*bs
);
690 #endif /* BLOCK_INT_H */