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 "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 void (*bdrv_rebind)(BlockDriverState *bs);
126 int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp);
127 int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
128 int (*bdrv_make_empty)(BlockDriverState *bs);
130 void (*bdrv_refresh_filename)(BlockDriverState *bs);
133 BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
134 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
135 BlockCompletionFunc *cb, void *opaque);
136 BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
137 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
138 BlockCompletionFunc *cb, void *opaque);
139 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
140 BlockCompletionFunc *cb, void *opaque);
141 BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
142 int64_t sector_num, int nb_sectors,
143 BlockCompletionFunc *cb, void *opaque);
145 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
146 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
147 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
148 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
150 * Efficiently zero a region of the disk image. Typically an image format
151 * would use a compact metadata representation to implement this. This
152 * function pointer may be NULL and .bdrv_co_writev() will be called
155 int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs,
156 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags);
157 int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
158 int64_t sector_num, int nb_sectors);
159 int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
160 int64_t sector_num, int nb_sectors, int *pnum);
163 * Invalidate any cached meta-data.
165 void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp);
168 * Flushes all data that was already written to the OS all the way down to
169 * the disk (for example raw-posix calls fsync()).
171 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);
174 * Flushes all internal caches to the OS. The data may still sit in a
175 * writeback cache of the host OS, but it will survive a crash of the qemu
178 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);
180 const char *protocol_name;
181 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
183 int64_t (*bdrv_getlength)(BlockDriverState *bs);
184 bool has_variable_length;
185 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
187 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
188 const uint8_t *buf, int nb_sectors);
190 int (*bdrv_snapshot_create)(BlockDriverState *bs,
191 QEMUSnapshotInfo *sn_info);
192 int (*bdrv_snapshot_goto)(BlockDriverState *bs,
193 const char *snapshot_id);
194 int (*bdrv_snapshot_delete)(BlockDriverState *bs,
195 const char *snapshot_id,
198 int (*bdrv_snapshot_list)(BlockDriverState *bs,
199 QEMUSnapshotInfo **psn_info);
200 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
201 const char *snapshot_id,
204 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
205 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
207 int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
209 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
210 int64_t pos, int size);
212 int (*bdrv_change_backing_file)(BlockDriverState *bs,
213 const char *backing_file, const char *backing_fmt);
215 /* removable device specific */
216 int (*bdrv_is_inserted)(BlockDriverState *bs);
217 int (*bdrv_media_changed)(BlockDriverState *bs);
218 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
219 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);
221 /* to control generic scsi devices */
222 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
223 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
224 unsigned long int req, void *buf,
225 BlockCompletionFunc *cb, void *opaque);
227 /* List of options for creating images, terminated by name == NULL */
228 QemuOptsList *create_opts;
231 * Returns 0 for completed check, -errno for internal errors.
232 * The check results are stored in result.
234 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
237 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts,
238 BlockDriverAmendStatusCB *status_cb);
240 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
242 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
243 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event,
245 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs,
247 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag);
248 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag);
250 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp);
253 * Returns 1 if newly created images are guaranteed to contain only
254 * zeros, 0 otherwise.
256 int (*bdrv_has_zero_init)(BlockDriverState *bs);
258 /* Remove fd handlers, timers, and other event loop callbacks so the event
259 * loop is no longer in use. Called with no in-flight requests and in
260 * depth-first traversal order with parents before child nodes.
262 void (*bdrv_detach_aio_context)(BlockDriverState *bs);
264 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
265 * can be processed again. Called with no in-flight requests and in
266 * depth-first traversal order with child nodes before parent nodes.
268 void (*bdrv_attach_aio_context)(BlockDriverState *bs,
269 AioContext *new_context);
271 /* io queue for linux-aio */
272 void (*bdrv_io_plug)(BlockDriverState *bs);
273 void (*bdrv_io_unplug)(BlockDriverState *bs);
274 void (*bdrv_flush_io_queue)(BlockDriverState *bs);
277 * Try to get @bs's logical and physical block size.
278 * On success, store them in @bsz and return zero.
279 * On failure, return negative errno.
281 int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz);
283 * Try to get @bs's geometry (cyls, heads, sectors)
284 * On success, store them in @geo and return 0.
285 * On failure return -errno.
286 * Only drivers that want to override guest geometry implement this
287 * callback; see hd_geometry_guess().
289 int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
291 QLIST_ENTRY(BlockDriver) list;
294 typedef struct BlockLimits {
295 /* maximum number of sectors that can be discarded at once */
298 /* optimal alignment for discard requests in sectors */
299 int64_t discard_alignment;
301 /* maximum number of sectors that can zeroized at once */
302 int max_write_zeroes;
304 /* optimal alignment for write zeroes requests in sectors */
305 int64_t write_zeroes_alignment;
307 /* optimal transfer length in sectors */
308 int opt_transfer_length;
310 /* maximal transfer length in sectors */
311 int max_transfer_length;
313 /* memory alignment so that no bounce buffer is needed */
314 size_t min_mem_alignment;
316 /* memory alignment for bounce buffer */
317 size_t opt_mem_alignment;
320 typedef struct BdrvOpBlocker BdrvOpBlocker;
322 typedef struct BdrvAioNotifier {
323 void (*attached_aio_context)(AioContext *new_context, void *opaque);
324 void (*detach_aio_context)(void *opaque);
328 QLIST_ENTRY(BdrvAioNotifier) list;
331 struct BdrvChildRole {
332 int (*inherit_flags)(int parent_flags);
335 extern const BdrvChildRole child_file;
336 extern const BdrvChildRole child_format;
339 BlockDriverState *bs;
340 const BdrvChildRole *role;
341 QLIST_ENTRY(BdrvChild) next;
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];
381 BlockDriverState *backing_hd;
382 BdrvChild *backing_child;
383 BlockDriverState *file;
385 NotifierList close_notifiers;
387 /* Callback before write request is processed */
388 NotifierWithReturnList before_write_notifiers;
390 /* number of in-flight serialising requests */
391 unsigned int serialising_in_flight;
394 CoQueue throttled_reqs[2];
395 bool io_limits_enabled;
396 /* The following fields are protected by the ThrottleGroup lock.
397 * See the ThrottleGroup documentation for details. */
398 ThrottleState *throttle_state;
399 ThrottleTimers throttle_timers;
400 unsigned pending_reqs[2];
401 QLIST_ENTRY(BlockDriverState) round_robin;
403 /* I/O stats (display with "info blockstats"). */
404 BlockAcctStats stats;
409 /* Whether produces zeros when read beyond eof */
410 bool zero_beyond_eof;
412 /* Alignment requirement for offset/length of I/O requests */
413 unsigned int request_alignment;
415 /* the block size for which the guest device expects atomicity */
416 int guest_block_size;
418 /* do we need to tell the quest if we have a volatile write cache? */
419 int enable_write_cache;
421 /* NOTE: the following infos are only hints for real hardware
422 drivers. They are not used by the block driver */
423 BlockdevOnError on_read_error, on_write_error;
424 bool iostatus_enabled;
425 BlockDeviceIoStatus iostatus;
427 /* the following member gives a name to every node on the bs graph. */
429 /* element of the list of named nodes building the graph */
430 QTAILQ_ENTRY(BlockDriverState) node_list;
431 /* element of the list of "drives" the guest sees */
432 QTAILQ_ENTRY(BlockDriverState) device_list;
433 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
436 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
438 /* operation blockers */
439 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX];
441 /* long-running background operation */
444 /* The node that this node inherited default options from (and a reopen on
445 * which can affect this node by changing these defaults). This is always a
446 * parent node of this node. */
447 BlockDriverState *inherits_from;
448 QLIST_HEAD(, BdrvChild) children;
451 BlockdevDetectZeroesOptions detect_zeroes;
453 /* The error object in use for blocking operations on backing_hd */
454 Error *backing_blocker;
456 /* threshold limit for writes, in bytes. "High water mark". */
457 uint64_t write_threshold_offset;
458 NotifierWithReturn write_threshold_notifier;
462 /* Essential block drivers which must always be statically linked into qemu, and
463 * which therefore can be accessed without using bdrv_find_format() */
464 extern BlockDriver bdrv_file;
465 extern BlockDriver bdrv_raw;
466 extern BlockDriver bdrv_qcow2;
469 * bdrv_setup_io_funcs:
471 * Prepare a #BlockDriver for I/O request processing by populating
472 * unimplemented coroutine and AIO interfaces with generic wrapper functions
473 * that fall back to implemented interfaces.
475 void bdrv_setup_io_funcs(BlockDriver *bdrv);
477 int get_tmp_filename(char *filename, int size);
478 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
479 const char *filename);
481 void bdrv_set_io_limits(BlockDriverState *bs,
482 ThrottleConfig *cfg);
486 * bdrv_add_before_write_notifier:
488 * Register a callback that is invoked before write requests are processed but
489 * after any throttling or waiting for overlapping requests.
491 void bdrv_add_before_write_notifier(BlockDriverState *bs,
492 NotifierWithReturn *notifier);
495 * bdrv_detach_aio_context:
497 * May be called from .bdrv_detach_aio_context() to detach children from the
498 * current #AioContext. This is only needed by block drivers that manage their
499 * own children. Both ->file and ->backing_hd are automatically handled and
500 * block drivers should not call this function on them explicitly.
502 void bdrv_detach_aio_context(BlockDriverState *bs);
505 * bdrv_attach_aio_context:
507 * May be called from .bdrv_attach_aio_context() to attach children to the new
508 * #AioContext. This is only needed by block drivers that manage their own
509 * children. Both ->file and ->backing_hd are automatically handled and block
510 * drivers should not call this function on them explicitly.
512 void bdrv_attach_aio_context(BlockDriverState *bs,
513 AioContext *new_context);
516 * bdrv_add_aio_context_notifier:
518 * If a long-running job intends to be always run in the same AioContext as a
519 * certain BDS, it may use this function to be notified of changes regarding the
520 * association of the BDS to an AioContext.
522 * attached_aio_context() is called after the target BDS has been attached to a
523 * new AioContext; detach_aio_context() is called before the target BDS is being
524 * detached from its old AioContext.
526 void bdrv_add_aio_context_notifier(BlockDriverState *bs,
527 void (*attached_aio_context)(AioContext *new_context, void *opaque),
528 void (*detach_aio_context)(void *opaque), void *opaque);
531 * bdrv_remove_aio_context_notifier:
533 * Unsubscribe of change notifications regarding the BDS's AioContext. The
534 * parameters given here have to be the same as those given to
535 * bdrv_add_aio_context_notifier().
537 void bdrv_remove_aio_context_notifier(BlockDriverState *bs,
538 void (*aio_context_attached)(AioContext *,
540 void (*aio_context_detached)(void *),
544 int is_windows_drive(const char *filename);
549 * @bs: Block device to operate on.
550 * @base: Block device that will become the new base, or %NULL to
551 * flatten the whole backing file chain onto @bs.
552 * @base_id: The file name that will be written to @bs as the new
553 * backing file if the job completes. Ignored if @base is %NULL.
554 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
555 * @on_error: The action to take upon error.
556 * @cb: Completion function for the job.
557 * @opaque: Opaque pointer value passed to @cb.
558 * @errp: Error object.
560 * Start a streaming operation on @bs. Clusters that are unallocated
561 * in @bs, but allocated in any image between @base and @bs (both
562 * exclusive) will be written to @bs. At the end of a successful
563 * streaming job, the backing file of @bs will be changed to
564 * @base_id in the written image and to @base in the live BlockDriverState.
566 void stream_start(BlockDriverState *bs, BlockDriverState *base,
567 const char *base_id, int64_t speed, BlockdevOnError on_error,
568 BlockCompletionFunc *cb,
569 void *opaque, Error **errp);
573 * @bs: Active block device.
574 * @top: Top block device to be committed.
575 * @base: Block device that will be written into, and become the new top.
576 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
577 * @on_error: The action to take upon error.
578 * @cb: Completion function for the job.
579 * @opaque: Opaque pointer value passed to @cb.
580 * @backing_file_str: String to use as the backing file in @top's overlay
581 * @errp: Error object.
584 void commit_start(BlockDriverState *bs, BlockDriverState *base,
585 BlockDriverState *top, int64_t speed,
586 BlockdevOnError on_error, BlockCompletionFunc *cb,
587 void *opaque, const char *backing_file_str, Error **errp);
589 * commit_active_start:
590 * @bs: Active block device to be committed.
591 * @base: Block device that will be written into, and become the new top.
592 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
593 * @on_error: The action to take upon error.
594 * @cb: Completion function for the job.
595 * @opaque: Opaque pointer value passed to @cb.
596 * @errp: Error object.
599 void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
601 BlockdevOnError on_error,
602 BlockCompletionFunc *cb,
603 void *opaque, Error **errp);
606 * @bs: Block device to operate on.
607 * @target: Block device to write to.
608 * @replaces: Block graph node name to replace once the mirror is done. Can
609 * only be used when full mirroring is selected.
610 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
611 * @granularity: The chosen granularity for the dirty bitmap.
612 * @buf_size: The amount of data that can be in flight at one time.
613 * @mode: Whether to collapse all images in the chain to the target.
614 * @on_source_error: The action to take upon error reading from the source.
615 * @on_target_error: The action to take upon error writing to the target.
616 * @unmap: Whether to unmap target where source sectors only contain zeroes.
617 * @cb: Completion function for the job.
618 * @opaque: Opaque pointer value passed to @cb.
619 * @errp: Error object.
621 * Start a mirroring operation on @bs. Clusters that are allocated
622 * in @bs will be written to @bs until the job is cancelled or
623 * manually completed. At the end of a successful mirroring job,
624 * @bs will be switched to read from @target.
626 void mirror_start(BlockDriverState *bs, BlockDriverState *target,
627 const char *replaces,
628 int64_t speed, uint32_t granularity, int64_t buf_size,
629 MirrorSyncMode mode, BlockdevOnError on_source_error,
630 BlockdevOnError on_target_error,
632 BlockCompletionFunc *cb,
633 void *opaque, Error **errp);
637 * @bs: Block device to operate on.
638 * @target: Block device to write to.
639 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
640 * @sync_mode: What parts of the disk image should be copied to the destination.
641 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
642 * @on_source_error: The action to take upon error reading from the source.
643 * @on_target_error: The action to take upon error writing to the target.
644 * @cb: Completion function for the job.
645 * @opaque: Opaque pointer value passed to @cb.
647 * Start a backup operation on @bs. Clusters in @bs are written to @target
648 * until the job is cancelled or manually completed.
650 void backup_start(BlockDriverState *bs, BlockDriverState *target,
651 int64_t speed, MirrorSyncMode sync_mode,
652 BdrvDirtyBitmap *sync_bitmap,
653 BlockdevOnError on_source_error,
654 BlockdevOnError on_target_error,
655 BlockCompletionFunc *cb, void *opaque,
658 void blk_dev_change_media_cb(BlockBackend *blk, bool load);
659 bool blk_dev_has_removable_media(BlockBackend *blk);
660 void blk_dev_eject_request(BlockBackend *blk, bool force);
661 bool blk_dev_is_tray_open(BlockBackend *blk);
662 bool blk_dev_is_medium_locked(BlockBackend *blk);
663 void blk_dev_resize_cb(BlockBackend *blk);
665 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
667 #endif /* BLOCK_INT_H */