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_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_HWVERSION "hwversion"
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
);
124 void (*bdrv_join_options
)(QDict
*options
, QDict
*old_options
);
126 int (*bdrv_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
128 int (*bdrv_file_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
130 void (*bdrv_close
)(BlockDriverState
*bs
);
131 int (*bdrv_create
)(const char *filename
, QemuOpts
*opts
, Error
**errp
);
132 int (*bdrv_set_key
)(BlockDriverState
*bs
, const char *key
);
133 int (*bdrv_make_empty
)(BlockDriverState
*bs
);
135 void (*bdrv_refresh_filename
)(BlockDriverState
*bs
, QDict
*options
);
138 BlockAIOCB
*(*bdrv_aio_readv
)(BlockDriverState
*bs
,
139 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
140 BlockCompletionFunc
*cb
, void *opaque
);
141 BlockAIOCB
*(*bdrv_aio_writev
)(BlockDriverState
*bs
,
142 int64_t sector_num
, QEMUIOVector
*qiov
, int nb_sectors
,
143 BlockCompletionFunc
*cb
, void *opaque
);
144 BlockAIOCB
*(*bdrv_aio_flush
)(BlockDriverState
*bs
,
145 BlockCompletionFunc
*cb
, void *opaque
);
146 BlockAIOCB
*(*bdrv_aio_discard
)(BlockDriverState
*bs
,
147 int64_t sector_num
, int nb_sectors
,
148 BlockCompletionFunc
*cb
, void *opaque
);
150 int coroutine_fn (*bdrv_co_readv
)(BlockDriverState
*bs
,
151 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
152 int coroutine_fn (*bdrv_co_preadv
)(BlockDriverState
*bs
,
153 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
);
154 int coroutine_fn (*bdrv_co_writev
)(BlockDriverState
*bs
,
155 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
156 int coroutine_fn (*bdrv_co_writev_flags
)(BlockDriverState
*bs
,
157 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
, int flags
);
158 int coroutine_fn (*bdrv_co_pwritev
)(BlockDriverState
*bs
,
159 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
);
162 * Efficiently zero a region of the disk image. Typically an image format
163 * would use a compact metadata representation to implement this. This
164 * function pointer may be NULL or return -ENOSUP and .bdrv_co_writev()
165 * will be called instead.
167 int coroutine_fn (*bdrv_co_write_zeroes
)(BlockDriverState
*bs
,
168 int64_t sector_num
, int nb_sectors
, BdrvRequestFlags flags
);
169 int coroutine_fn (*bdrv_co_discard
)(BlockDriverState
*bs
,
170 int64_t sector_num
, int nb_sectors
);
171 int64_t coroutine_fn (*bdrv_co_get_block_status
)(BlockDriverState
*bs
,
172 int64_t sector_num
, int nb_sectors
, int *pnum
,
173 BlockDriverState
**file
);
176 * Invalidate any cached meta-data.
178 void (*bdrv_invalidate_cache
)(BlockDriverState
*bs
, Error
**errp
);
179 int (*bdrv_inactivate
)(BlockDriverState
*bs
);
182 * Flushes all data for all layers by calling bdrv_co_flush for underlying
183 * layers, if needed. This function is needed for deterministic
184 * synchronization of the flush finishing callback.
186 int coroutine_fn (*bdrv_co_flush
)(BlockDriverState
*bs
);
189 * Flushes all data that was already written to the OS all the way down to
190 * the disk (for example raw-posix calls fsync()).
192 int coroutine_fn (*bdrv_co_flush_to_disk
)(BlockDriverState
*bs
);
195 * Flushes all internal caches to the OS. The data may still sit in a
196 * writeback cache of the host OS, but it will survive a crash of the qemu
199 int coroutine_fn (*bdrv_co_flush_to_os
)(BlockDriverState
*bs
);
201 const char *protocol_name
;
202 int (*bdrv_truncate
)(BlockDriverState
*bs
, int64_t offset
);
204 int64_t (*bdrv_getlength
)(BlockDriverState
*bs
);
205 bool has_variable_length
;
206 int64_t (*bdrv_get_allocated_file_size
)(BlockDriverState
*bs
);
208 int (*bdrv_write_compressed
)(BlockDriverState
*bs
, int64_t sector_num
,
209 const uint8_t *buf
, int nb_sectors
);
211 int (*bdrv_snapshot_create
)(BlockDriverState
*bs
,
212 QEMUSnapshotInfo
*sn_info
);
213 int (*bdrv_snapshot_goto
)(BlockDriverState
*bs
,
214 const char *snapshot_id
);
215 int (*bdrv_snapshot_delete
)(BlockDriverState
*bs
,
216 const char *snapshot_id
,
219 int (*bdrv_snapshot_list
)(BlockDriverState
*bs
,
220 QEMUSnapshotInfo
**psn_info
);
221 int (*bdrv_snapshot_load_tmp
)(BlockDriverState
*bs
,
222 const char *snapshot_id
,
225 int (*bdrv_get_info
)(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
226 ImageInfoSpecific
*(*bdrv_get_specific_info
)(BlockDriverState
*bs
);
228 int (*bdrv_save_vmstate
)(BlockDriverState
*bs
, QEMUIOVector
*qiov
,
230 int (*bdrv_load_vmstate
)(BlockDriverState
*bs
, uint8_t *buf
,
231 int64_t pos
, int size
);
233 int (*bdrv_change_backing_file
)(BlockDriverState
*bs
,
234 const char *backing_file
, const char *backing_fmt
);
236 /* removable device specific */
237 bool (*bdrv_is_inserted
)(BlockDriverState
*bs
);
238 int (*bdrv_media_changed
)(BlockDriverState
*bs
);
239 void (*bdrv_eject
)(BlockDriverState
*bs
, bool eject_flag
);
240 void (*bdrv_lock_medium
)(BlockDriverState
*bs
, bool locked
);
242 /* to control generic scsi devices */
243 BlockAIOCB
*(*bdrv_aio_ioctl
)(BlockDriverState
*bs
,
244 unsigned long int req
, void *buf
,
245 BlockCompletionFunc
*cb
, void *opaque
);
247 /* List of options for creating images, terminated by name == NULL */
248 QemuOptsList
*create_opts
;
251 * Returns 0 for completed check, -errno for internal errors.
252 * The check results are stored in result.
254 int (*bdrv_check
)(BlockDriverState
* bs
, BdrvCheckResult
*result
,
257 int (*bdrv_amend_options
)(BlockDriverState
*bs
, QemuOpts
*opts
,
258 BlockDriverAmendStatusCB
*status_cb
,
261 void (*bdrv_debug_event
)(BlockDriverState
*bs
, BlkdebugEvent event
);
263 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
264 int (*bdrv_debug_breakpoint
)(BlockDriverState
*bs
, const char *event
,
266 int (*bdrv_debug_remove_breakpoint
)(BlockDriverState
*bs
,
268 int (*bdrv_debug_resume
)(BlockDriverState
*bs
, const char *tag
);
269 bool (*bdrv_debug_is_suspended
)(BlockDriverState
*bs
, const char *tag
);
271 void (*bdrv_refresh_limits
)(BlockDriverState
*bs
, Error
**errp
);
274 * Returns 1 if newly created images are guaranteed to contain only
275 * zeros, 0 otherwise.
277 int (*bdrv_has_zero_init
)(BlockDriverState
*bs
);
279 /* Remove fd handlers, timers, and other event loop callbacks so the event
280 * loop is no longer in use. Called with no in-flight requests and in
281 * depth-first traversal order with parents before child nodes.
283 void (*bdrv_detach_aio_context
)(BlockDriverState
*bs
);
285 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
286 * can be processed again. Called with no in-flight requests and in
287 * depth-first traversal order with child nodes before parent nodes.
289 void (*bdrv_attach_aio_context
)(BlockDriverState
*bs
,
290 AioContext
*new_context
);
292 /* io queue for linux-aio */
293 void (*bdrv_io_plug
)(BlockDriverState
*bs
);
294 void (*bdrv_io_unplug
)(BlockDriverState
*bs
);
297 * Try to get @bs's logical and physical block size.
298 * On success, store them in @bsz and return zero.
299 * On failure, return negative errno.
301 int (*bdrv_probe_blocksizes
)(BlockDriverState
*bs
, BlockSizes
*bsz
);
303 * Try to get @bs's geometry (cyls, heads, sectors)
304 * On success, store them in @geo and return 0.
305 * On failure return -errno.
306 * Only drivers that want to override guest geometry implement this
307 * callback; see hd_geometry_guess().
309 int (*bdrv_probe_geometry
)(BlockDriverState
*bs
, HDGeometry
*geo
);
312 * Drain and stop any internal sources of requests in the driver, and
313 * remain so until next I/O callback (e.g. bdrv_co_writev) is called.
315 void (*bdrv_drain
)(BlockDriverState
*bs
);
317 void (*bdrv_add_child
)(BlockDriverState
*parent
, BlockDriverState
*child
,
319 void (*bdrv_del_child
)(BlockDriverState
*parent
, BdrvChild
*child
,
322 QLIST_ENTRY(BlockDriver
) list
;
325 typedef struct BlockLimits
{
326 /* maximum number of sectors that can be discarded at once */
329 /* optimal alignment for discard requests in sectors */
330 int64_t discard_alignment
;
332 /* maximum number of sectors that can zeroized at once */
333 int max_write_zeroes
;
335 /* optimal alignment for write zeroes requests in sectors */
336 int64_t write_zeroes_alignment
;
338 /* optimal transfer length in sectors */
339 int opt_transfer_length
;
341 /* maximal transfer length in sectors */
342 int max_transfer_length
;
344 /* memory alignment so that no bounce buffer is needed */
345 size_t min_mem_alignment
;
347 /* memory alignment for bounce buffer */
348 size_t opt_mem_alignment
;
350 /* maximum number of iovec elements */
354 typedef struct BdrvOpBlocker BdrvOpBlocker
;
356 typedef struct BdrvAioNotifier
{
357 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
);
358 void (*detach_aio_context
)(void *opaque
);
362 QLIST_ENTRY(BdrvAioNotifier
) list
;
365 struct BdrvChildRole
{
366 void (*inherit_options
)(int *child_flags
, QDict
*child_options
,
367 int parent_flags
, QDict
*parent_options
);
370 extern const BdrvChildRole child_file
;
371 extern const BdrvChildRole child_format
;
374 BlockDriverState
*bs
;
376 const BdrvChildRole
*role
;
377 QLIST_ENTRY(BdrvChild
) next
;
378 QLIST_ENTRY(BdrvChild
) next_parent
;
382 * Note: the function bdrv_append() copies and swaps contents of
383 * BlockDriverStates, so if you add new fields to this struct, please
384 * inspect bdrv_append() to determine if the new fields need to be
387 struct BlockDriverState
{
388 int64_t total_sectors
; /* if we are reading a disk image, give its
390 int read_only
; /* if true, the media is read only */
391 int open_flags
; /* flags used to open the file, re-used for re-open */
392 int encrypted
; /* if true, the media is encrypted */
393 int valid_key
; /* if true, a valid encryption key has been set */
394 int sg
; /* if true, the device is a /dev/sg* */
395 int copy_on_read
; /* if true, copy read backing sectors into image
396 note this is a reference count */
399 BlockDriver
*drv
; /* NULL means no media */
402 BlockBackend
*blk
; /* owning backend, if any */
404 AioContext
*aio_context
; /* event loop used for fd handlers, timers, etc */
405 /* long-running tasks intended to always use the same AioContext as this
406 * BDS may register themselves in this list to be notified of changes
407 * regarding this BDS's context */
408 QLIST_HEAD(, BdrvAioNotifier
) aio_notifiers
;
410 char filename
[PATH_MAX
];
411 char backing_file
[PATH_MAX
]; /* if non zero, the image is a diff of
413 char backing_format
[16]; /* if non-zero and backing_file exists */
415 QDict
*full_open_options
;
416 char exact_filename
[PATH_MAX
];
421 /* Callback before write request is processed */
422 NotifierWithReturnList before_write_notifiers
;
424 /* number of in-flight serialising requests */
425 unsigned int serialising_in_flight
;
428 * throttle_state tells us if this BDS has I/O limits configured.
429 * io_limits_disabled tells us if they are currently being enforced */
430 CoQueue throttled_reqs
[2];
431 unsigned int io_limits_disabled
;
433 /* The following fields are protected by the ThrottleGroup lock.
434 * See the ThrottleGroup documentation for details. */
435 ThrottleState
*throttle_state
;
436 ThrottleTimers throttle_timers
;
437 unsigned pending_reqs
[2];
438 QLIST_ENTRY(BlockDriverState
) round_robin
;
440 /* Offset after the highest byte written to */
441 uint64_t wr_highest_offset
;
446 /* Whether produces zeros when read beyond eof */
447 bool zero_beyond_eof
;
449 /* Alignment requirement for offset/length of I/O requests */
450 unsigned int request_alignment
;
451 /* Flags honored during pwrite (so far: BDRV_REQ_FUA) */
452 unsigned int supported_write_flags
;
453 /* Flags honored during write_zeroes (so far: BDRV_REQ_FUA,
454 * BDRV_REQ_MAY_UNMAP) */
455 unsigned int supported_zero_flags
;
457 /* the following member gives a name to every node on the bs graph. */
459 /* element of the list of named nodes building the graph */
460 QTAILQ_ENTRY(BlockDriverState
) node_list
;
461 /* element of the list of all BlockDriverStates (all_bdrv_states) */
462 QTAILQ_ENTRY(BlockDriverState
) bs_list
;
463 /* element of the list of monitor-owned BDS */
464 QTAILQ_ENTRY(BlockDriverState
) monitor_list
;
465 QLIST_HEAD(, BdrvDirtyBitmap
) dirty_bitmaps
;
468 QLIST_HEAD(, BdrvTrackedRequest
) tracked_requests
;
470 /* operation blockers */
471 QLIST_HEAD(, BdrvOpBlocker
) op_blockers
[BLOCK_OP_TYPE_MAX
];
473 /* long-running background operation */
476 /* The node that this node inherited default options from (and a reopen on
477 * which can affect this node by changing these defaults). This is always a
478 * parent node of this node. */
479 BlockDriverState
*inherits_from
;
480 QLIST_HEAD(, BdrvChild
) children
;
481 QLIST_HEAD(, BdrvChild
) parents
;
484 QDict
*explicit_options
;
485 BlockdevDetectZeroesOptions detect_zeroes
;
487 /* The error object in use for blocking operations on backing_hd */
488 Error
*backing_blocker
;
490 /* threshold limit for writes, in bytes. "High water mark". */
491 uint64_t write_threshold_offset
;
492 NotifierWithReturn write_threshold_notifier
;
494 /* counters for nested bdrv_io_plug and bdrv_io_unplugged_begin */
496 unsigned io_plug_disabled
;
501 struct BlockBackendRootState
{
504 BlockdevDetectZeroesOptions detect_zeroes
;
506 char *throttle_group
;
507 ThrottleState
*throttle_state
;
510 static inline BlockDriverState
*backing_bs(BlockDriverState
*bs
)
512 return bs
->backing
? bs
->backing
->bs
: NULL
;
516 /* Essential block drivers which must always be statically linked into qemu, and
517 * which therefore can be accessed without using bdrv_find_format() */
518 extern BlockDriver bdrv_file
;
519 extern BlockDriver bdrv_raw
;
520 extern BlockDriver bdrv_qcow2
;
523 * bdrv_setup_io_funcs:
525 * Prepare a #BlockDriver for I/O request processing by populating
526 * unimplemented coroutine and AIO interfaces with generic wrapper functions
527 * that fall back to implemented interfaces.
529 void bdrv_setup_io_funcs(BlockDriver
*bdrv
);
531 int coroutine_fn
bdrv_co_preadv(BlockDriverState
*bs
,
532 int64_t offset
, unsigned int bytes
, QEMUIOVector
*qiov
,
533 BdrvRequestFlags flags
);
534 int coroutine_fn
bdrv_co_pwritev(BlockDriverState
*bs
,
535 int64_t offset
, unsigned int bytes
, QEMUIOVector
*qiov
,
536 BdrvRequestFlags flags
);
538 int get_tmp_filename(char *filename
, int size
);
539 BlockDriver
*bdrv_probe_all(const uint8_t *buf
, int buf_size
,
540 const char *filename
);
542 void bdrv_set_io_limits(BlockDriverState
*bs
,
543 ThrottleConfig
*cfg
);
547 * bdrv_add_before_write_notifier:
549 * Register a callback that is invoked before write requests are processed but
550 * after any throttling or waiting for overlapping requests.
552 void bdrv_add_before_write_notifier(BlockDriverState
*bs
,
553 NotifierWithReturn
*notifier
);
556 * bdrv_detach_aio_context:
558 * May be called from .bdrv_detach_aio_context() to detach children from the
559 * current #AioContext. This is only needed by block drivers that manage their
560 * own children. Both ->file and ->backing are automatically handled and
561 * block drivers should not call this function on them explicitly.
563 void bdrv_detach_aio_context(BlockDriverState
*bs
);
566 * bdrv_attach_aio_context:
568 * May be called from .bdrv_attach_aio_context() to attach children to the new
569 * #AioContext. This is only needed by block drivers that manage their own
570 * children. Both ->file and ->backing are automatically handled and block
571 * drivers should not call this function on them explicitly.
573 void bdrv_attach_aio_context(BlockDriverState
*bs
,
574 AioContext
*new_context
);
577 * bdrv_add_aio_context_notifier:
579 * If a long-running job intends to be always run in the same AioContext as a
580 * certain BDS, it may use this function to be notified of changes regarding the
581 * association of the BDS to an AioContext.
583 * attached_aio_context() is called after the target BDS has been attached to a
584 * new AioContext; detach_aio_context() is called before the target BDS is being
585 * detached from its old AioContext.
587 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
588 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
589 void (*detach_aio_context
)(void *opaque
), void *opaque
);
592 * bdrv_remove_aio_context_notifier:
594 * Unsubscribe of change notifications regarding the BDS's AioContext. The
595 * parameters given here have to be the same as those given to
596 * bdrv_add_aio_context_notifier().
598 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
599 void (*aio_context_attached
)(AioContext
*,
601 void (*aio_context_detached
)(void *),
605 int is_windows_drive(const char *filename
);
610 * @bs: Block device to operate on.
611 * @base: Block device that will become the new base, or %NULL to
612 * flatten the whole backing file chain onto @bs.
613 * @base_id: The file name that will be written to @bs as the new
614 * backing file if the job completes. Ignored if @base is %NULL.
615 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
616 * @on_error: The action to take upon error.
617 * @cb: Completion function for the job.
618 * @opaque: Opaque pointer value passed to @cb.
619 * @errp: Error object.
621 * Start a streaming operation on @bs. Clusters that are unallocated
622 * in @bs, but allocated in any image between @base and @bs (both
623 * exclusive) will be written to @bs. At the end of a successful
624 * streaming job, the backing file of @bs will be changed to
625 * @base_id in the written image and to @base in the live BlockDriverState.
627 void stream_start(BlockDriverState
*bs
, BlockDriverState
*base
,
628 const char *base_id
, int64_t speed
, BlockdevOnError on_error
,
629 BlockCompletionFunc
*cb
,
630 void *opaque
, Error
**errp
);
634 * @bs: Active block device.
635 * @top: Top block device to be committed.
636 * @base: Block device that will be written into, and become the new top.
637 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
638 * @on_error: The action to take upon error.
639 * @cb: Completion function for the job.
640 * @opaque: Opaque pointer value passed to @cb.
641 * @backing_file_str: String to use as the backing file in @top's overlay
642 * @errp: Error object.
645 void commit_start(BlockDriverState
*bs
, BlockDriverState
*base
,
646 BlockDriverState
*top
, int64_t speed
,
647 BlockdevOnError on_error
, BlockCompletionFunc
*cb
,
648 void *opaque
, const char *backing_file_str
, Error
**errp
);
650 * commit_active_start:
651 * @bs: Active block device to be committed.
652 * @base: Block device that will be written into, and become the new top.
653 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
654 * @on_error: The action to take upon error.
655 * @cb: Completion function for the job.
656 * @opaque: Opaque pointer value passed to @cb.
657 * @errp: Error object.
660 void commit_active_start(BlockDriverState
*bs
, BlockDriverState
*base
,
662 BlockdevOnError on_error
,
663 BlockCompletionFunc
*cb
,
664 void *opaque
, Error
**errp
);
667 * @bs: Block device to operate on.
668 * @target: Block device to write to.
669 * @replaces: Block graph node name to replace once the mirror is done. Can
670 * only be used when full mirroring is selected.
671 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
672 * @granularity: The chosen granularity for the dirty bitmap.
673 * @buf_size: The amount of data that can be in flight at one time.
674 * @mode: Whether to collapse all images in the chain to the target.
675 * @on_source_error: The action to take upon error reading from the source.
676 * @on_target_error: The action to take upon error writing to the target.
677 * @unmap: Whether to unmap target where source sectors only contain zeroes.
678 * @cb: Completion function for the job.
679 * @opaque: Opaque pointer value passed to @cb.
680 * @errp: Error object.
682 * Start a mirroring operation on @bs. Clusters that are allocated
683 * in @bs will be written to @bs until the job is cancelled or
684 * manually completed. At the end of a successful mirroring job,
685 * @bs will be switched to read from @target.
687 void mirror_start(BlockDriverState
*bs
, BlockDriverState
*target
,
688 const char *replaces
,
689 int64_t speed
, uint32_t granularity
, int64_t buf_size
,
690 MirrorSyncMode mode
, BlockdevOnError on_source_error
,
691 BlockdevOnError on_target_error
,
693 BlockCompletionFunc
*cb
,
694 void *opaque
, Error
**errp
);
698 * @bs: Block device to operate on.
699 * @target: Block device to write to.
700 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
701 * @sync_mode: What parts of the disk image should be copied to the destination.
702 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
703 * @on_source_error: The action to take upon error reading from the source.
704 * @on_target_error: The action to take upon error writing to the target.
705 * @cb: Completion function for the job.
706 * @opaque: Opaque pointer value passed to @cb.
707 * @txn: Transaction that this job is part of (may be NULL).
709 * Start a backup operation on @bs. Clusters in @bs are written to @target
710 * until the job is cancelled or manually completed.
712 void backup_start(BlockDriverState
*bs
, BlockDriverState
*target
,
713 int64_t speed
, MirrorSyncMode sync_mode
,
714 BdrvDirtyBitmap
*sync_bitmap
,
715 BlockdevOnError on_source_error
,
716 BlockdevOnError on_target_error
,
717 BlockCompletionFunc
*cb
, void *opaque
,
718 BlockJobTxn
*txn
, Error
**errp
);
720 void hmp_drive_add_node(Monitor
*mon
, const char *optstr
);
722 BdrvChild
*bdrv_root_attach_child(BlockDriverState
*child_bs
,
723 const char *child_name
,
724 const BdrvChildRole
*child_role
);
725 void bdrv_root_unref_child(BdrvChild
*child
);
727 void bdrv_no_throttling_begin(BlockDriverState
*bs
);
728 void bdrv_no_throttling_end(BlockDriverState
*bs
);
730 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
);
731 bool blk_dev_has_removable_media(BlockBackend
*blk
);
732 bool blk_dev_has_tray(BlockBackend
*blk
);
733 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
734 bool blk_dev_is_tray_open(BlockBackend
*blk
);
735 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
736 void blk_dev_resize_cb(BlockBackend
*blk
);
738 void bdrv_set_dirty(BlockDriverState
*bs
, int64_t cur_sector
, int nr_sectors
);
739 bool bdrv_requests_pending(BlockDriverState
*bs
);
741 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap
*bitmap
, HBitmap
**out
);
742 void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap
*bitmap
, HBitmap
*in
);
744 void blockdev_close_all_bdrv_states(void);
746 #endif /* BLOCK_INT_H */