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/aio-wait.h"
30 #include "qemu/queue.h"
31 #include "qemu/coroutine.h"
32 #include "qemu/stats64.h"
33 #include "qemu/timer.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_LAZY_REFCOUNTS 8
41 #define BLOCK_OPT_SIZE "size"
42 #define BLOCK_OPT_ENCRYPT "encryption"
43 #define BLOCK_OPT_ENCRYPT_FORMAT "encrypt.format"
44 #define BLOCK_OPT_COMPAT6 "compat6"
45 #define BLOCK_OPT_HWVERSION "hwversion"
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"
59 #define BLOCK_OPT_DATA_FILE "data_file"
61 #define BLOCK_PROBE_BUF_SIZE 512
63 enum BdrvTrackedRequestType
{
67 BDRV_TRACKED_TRUNCATE
,
70 typedef struct BdrvTrackedRequest
{
74 enum BdrvTrackedRequestType type
;
77 int64_t overlap_offset
;
78 uint64_t overlap_bytes
;
80 QLIST_ENTRY(BdrvTrackedRequest
) list
;
81 Coroutine
*co
; /* owner, used for deadlock detection */
82 CoQueue wait_queue
; /* coroutines blocked on this request */
84 struct BdrvTrackedRequest
*waiting_for
;
88 const char *format_name
;
91 /* set to true if the BlockDriver is a block filter. Block filters pass
92 * certain callbacks that refer to data (see block.c) to their bs->file if
93 * the driver doesn't implement them. Drivers that do not wish to forward
94 * must implement them and return -ENOTSUP.
97 /* for snapshots block filter like Quorum can implement the
98 * following recursive callback.
99 * It's purpose is to recurse on the filter children while calling
100 * bdrv_recurse_is_first_non_filter on them.
101 * For a sample implementation look in the future Quorum block filter.
103 bool (*bdrv_recurse_is_first_non_filter
)(BlockDriverState
*bs
,
104 BlockDriverState
*candidate
);
106 int (*bdrv_probe
)(const uint8_t *buf
, int buf_size
, const char *filename
);
107 int (*bdrv_probe_device
)(const char *filename
);
109 /* Any driver implementing this callback is expected to be able to handle
110 * NULL file names in its .bdrv_open() implementation */
111 void (*bdrv_parse_filename
)(const char *filename
, QDict
*options
, Error
**errp
);
112 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
113 * this field set to true, except ones that are defined only by their
115 * An example of the last type will be the quorum block driver.
117 bool bdrv_needs_filename
;
119 /* Set if a driver can support backing files */
120 bool supports_backing
;
122 /* For handling image reopen for split or non-split files */
123 int (*bdrv_reopen_prepare
)(BDRVReopenState
*reopen_state
,
124 BlockReopenQueue
*queue
, Error
**errp
);
125 void (*bdrv_reopen_commit
)(BDRVReopenState
*reopen_state
);
126 void (*bdrv_reopen_abort
)(BDRVReopenState
*reopen_state
);
127 void (*bdrv_join_options
)(QDict
*options
, QDict
*old_options
);
129 int (*bdrv_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
132 /* Protocol drivers should implement this instead of bdrv_open */
133 int (*bdrv_file_open
)(BlockDriverState
*bs
, QDict
*options
, int flags
,
135 void (*bdrv_close
)(BlockDriverState
*bs
);
136 int coroutine_fn (*bdrv_co_create
)(BlockdevCreateOptions
*opts
,
138 int coroutine_fn (*bdrv_co_create_opts
)(const char *filename
,
141 int (*bdrv_make_empty
)(BlockDriverState
*bs
);
144 * Refreshes the bs->exact_filename field. If that is impossible,
145 * bs->exact_filename has to be left empty.
147 void (*bdrv_refresh_filename
)(BlockDriverState
*bs
);
150 * Gathers the open options for all children into @target.
151 * A simple format driver (without backing file support) might
152 * implement this function like this:
154 * QINCREF(bs->file->bs->full_open_options);
155 * qdict_put(target, "file", bs->file->bs->full_open_options);
157 * If not specified, the generic implementation will simply put
158 * all children's options under their respective name.
160 * @backing_overridden is true when bs->backing seems not to be
161 * the child that would result from opening bs->backing_file.
162 * Therefore, if it is true, the backing child's options should be
163 * gathered; otherwise, there is no need since the backing child
164 * is the one implied by the image header.
166 * Note that ideally this function would not be needed. Every
167 * block driver which implements it is probably doing something
168 * shady regarding its runtime option structure.
170 void (*bdrv_gather_child_options
)(BlockDriverState
*bs
, QDict
*target
,
171 bool backing_overridden
);
174 * Returns an allocated string which is the directory name of this BDS: It
175 * will be used to make relative filenames absolute by prepending this
176 * function's return value to them.
178 char *(*bdrv_dirname
)(BlockDriverState
*bs
, Error
**errp
);
181 BlockAIOCB
*(*bdrv_aio_preadv
)(BlockDriverState
*bs
,
182 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
,
183 BlockCompletionFunc
*cb
, void *opaque
);
184 BlockAIOCB
*(*bdrv_aio_pwritev
)(BlockDriverState
*bs
,
185 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
,
186 BlockCompletionFunc
*cb
, void *opaque
);
187 BlockAIOCB
*(*bdrv_aio_flush
)(BlockDriverState
*bs
,
188 BlockCompletionFunc
*cb
, void *opaque
);
189 BlockAIOCB
*(*bdrv_aio_pdiscard
)(BlockDriverState
*bs
,
190 int64_t offset
, int bytes
,
191 BlockCompletionFunc
*cb
, void *opaque
);
193 int coroutine_fn (*bdrv_co_readv
)(BlockDriverState
*bs
,
194 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
197 * @offset: position in bytes to read at
198 * @bytes: number of bytes to read
199 * @qiov: the buffers to fill with read data
200 * @flags: currently unused, always 0
202 * @offset and @bytes will be a multiple of 'request_alignment',
203 * but the length of individual @qiov elements does not have to
206 * @bytes will always equal the total size of @qiov, and will be
207 * no larger than 'max_transfer'.
209 * The buffer in @qiov may point directly to guest memory.
211 int coroutine_fn (*bdrv_co_preadv
)(BlockDriverState
*bs
,
212 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
);
213 int coroutine_fn (*bdrv_co_writev
)(BlockDriverState
*bs
,
214 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
, int flags
);
216 * @offset: position in bytes to write at
217 * @bytes: number of bytes to write
218 * @qiov: the buffers containing data to write
219 * @flags: zero or more bits allowed by 'supported_write_flags'
221 * @offset and @bytes will be a multiple of 'request_alignment',
222 * but the length of individual @qiov elements does not have to
225 * @bytes will always equal the total size of @qiov, and will be
226 * no larger than 'max_transfer'.
228 * The buffer in @qiov may point directly to guest memory.
230 int coroutine_fn (*bdrv_co_pwritev
)(BlockDriverState
*bs
,
231 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
, int flags
);
234 * Efficiently zero a region of the disk image. Typically an image format
235 * would use a compact metadata representation to implement this. This
236 * function pointer may be NULL or return -ENOSUP and .bdrv_co_writev()
237 * will be called instead.
239 int coroutine_fn (*bdrv_co_pwrite_zeroes
)(BlockDriverState
*bs
,
240 int64_t offset
, int bytes
, BdrvRequestFlags flags
);
241 int coroutine_fn (*bdrv_co_pdiscard
)(BlockDriverState
*bs
,
242 int64_t offset
, int bytes
);
244 /* Map [offset, offset + nbytes) range onto a child of @bs to copy from,
245 * and invoke bdrv_co_copy_range_from(child, ...), or invoke
246 * bdrv_co_copy_range_to() if @bs is the leaf child to copy data from.
248 * See the comment of bdrv_co_copy_range for the parameter and return value
251 int coroutine_fn (*bdrv_co_copy_range_from
)(BlockDriverState
*bs
,
257 BdrvRequestFlags read_flags
,
258 BdrvRequestFlags write_flags
);
260 /* Map [offset, offset + nbytes) range onto a child of bs to copy data to,
261 * and invoke bdrv_co_copy_range_to(child, src, ...), or perform the copy
262 * operation if @bs is the leaf and @src has the same BlockDriver. Return
263 * -ENOTSUP if @bs is the leaf but @src has a different BlockDriver.
265 * See the comment of bdrv_co_copy_range for the parameter and return value
268 int coroutine_fn (*bdrv_co_copy_range_to
)(BlockDriverState
*bs
,
274 BdrvRequestFlags read_flags
,
275 BdrvRequestFlags write_flags
);
278 * Building block for bdrv_block_status[_above] and
279 * bdrv_is_allocated[_above]. The driver should answer only
280 * according to the current layer, and should only need to set
281 * BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID,
282 * and/or BDRV_BLOCK_RAW; if the current layer defers to a backing
283 * layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See
284 * block.h for the overall meaning of the bits. As a hint, the
285 * flag want_zero is true if the caller cares more about precise
286 * mappings (favor accurate _OFFSET_VALID/_ZERO) or false for
287 * overall allocation (favor larger *pnum, perhaps by reporting
288 * _DATA instead of _ZERO). The block layer guarantees input
289 * clamped to bdrv_getlength() and aligned to request_alignment,
290 * as well as non-NULL pnum, map, and file; in turn, the driver
291 * must return an error or set pnum to an aligned non-zero value.
293 int coroutine_fn (*bdrv_co_block_status
)(BlockDriverState
*bs
,
294 bool want_zero
, int64_t offset
, int64_t bytes
, int64_t *pnum
,
295 int64_t *map
, BlockDriverState
**file
);
298 * Invalidate any cached meta-data.
300 void coroutine_fn (*bdrv_co_invalidate_cache
)(BlockDriverState
*bs
,
302 int (*bdrv_inactivate
)(BlockDriverState
*bs
);
305 * Flushes all data for all layers by calling bdrv_co_flush for underlying
306 * layers, if needed. This function is needed for deterministic
307 * synchronization of the flush finishing callback.
309 int coroutine_fn (*bdrv_co_flush
)(BlockDriverState
*bs
);
312 * Flushes all data that was already written to the OS all the way down to
313 * the disk (for example file-posix.c calls fsync()).
315 int coroutine_fn (*bdrv_co_flush_to_disk
)(BlockDriverState
*bs
);
318 * Flushes all internal caches to the OS. The data may still sit in a
319 * writeback cache of the host OS, but it will survive a crash of the qemu
322 int coroutine_fn (*bdrv_co_flush_to_os
)(BlockDriverState
*bs
);
325 * Drivers setting this field must be able to work with just a plain
326 * filename with '<protocol_name>:' as a prefix, and no other options.
327 * Options may be extracted from the filename by implementing
328 * bdrv_parse_filename.
330 const char *protocol_name
;
331 int coroutine_fn (*bdrv_co_truncate
)(BlockDriverState
*bs
, int64_t offset
,
332 PreallocMode prealloc
, Error
**errp
);
334 int64_t (*bdrv_getlength
)(BlockDriverState
*bs
);
335 bool has_variable_length
;
336 int64_t (*bdrv_get_allocated_file_size
)(BlockDriverState
*bs
);
337 BlockMeasureInfo
*(*bdrv_measure
)(QemuOpts
*opts
, BlockDriverState
*in_bs
,
340 int coroutine_fn (*bdrv_co_pwritev_compressed
)(BlockDriverState
*bs
,
341 uint64_t offset
, uint64_t bytes
, QEMUIOVector
*qiov
);
343 int (*bdrv_snapshot_create
)(BlockDriverState
*bs
,
344 QEMUSnapshotInfo
*sn_info
);
345 int (*bdrv_snapshot_goto
)(BlockDriverState
*bs
,
346 const char *snapshot_id
);
347 int (*bdrv_snapshot_delete
)(BlockDriverState
*bs
,
348 const char *snapshot_id
,
351 int (*bdrv_snapshot_list
)(BlockDriverState
*bs
,
352 QEMUSnapshotInfo
**psn_info
);
353 int (*bdrv_snapshot_load_tmp
)(BlockDriverState
*bs
,
354 const char *snapshot_id
,
357 int (*bdrv_get_info
)(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
358 ImageInfoSpecific
*(*bdrv_get_specific_info
)(BlockDriverState
*bs
,
361 int coroutine_fn (*bdrv_save_vmstate
)(BlockDriverState
*bs
,
364 int coroutine_fn (*bdrv_load_vmstate
)(BlockDriverState
*bs
,
368 int (*bdrv_change_backing_file
)(BlockDriverState
*bs
,
369 const char *backing_file
, const char *backing_fmt
);
371 /* removable device specific */
372 bool (*bdrv_is_inserted
)(BlockDriverState
*bs
);
373 void (*bdrv_eject
)(BlockDriverState
*bs
, bool eject_flag
);
374 void (*bdrv_lock_medium
)(BlockDriverState
*bs
, bool locked
);
376 /* to control generic scsi devices */
377 BlockAIOCB
*(*bdrv_aio_ioctl
)(BlockDriverState
*bs
,
378 unsigned long int req
, void *buf
,
379 BlockCompletionFunc
*cb
, void *opaque
);
380 int coroutine_fn (*bdrv_co_ioctl
)(BlockDriverState
*bs
,
381 unsigned long int req
, void *buf
);
383 /* List of options for creating images, terminated by name == NULL */
384 QemuOptsList
*create_opts
;
387 * Returns 0 for completed check, -errno for internal errors.
388 * The check results are stored in result.
390 int coroutine_fn (*bdrv_co_check
)(BlockDriverState
*bs
,
391 BdrvCheckResult
*result
,
394 int (*bdrv_amend_options
)(BlockDriverState
*bs
, QemuOpts
*opts
,
395 BlockDriverAmendStatusCB
*status_cb
,
399 void (*bdrv_debug_event
)(BlockDriverState
*bs
, BlkdebugEvent event
);
401 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
402 int (*bdrv_debug_breakpoint
)(BlockDriverState
*bs
, const char *event
,
404 int (*bdrv_debug_remove_breakpoint
)(BlockDriverState
*bs
,
406 int (*bdrv_debug_resume
)(BlockDriverState
*bs
, const char *tag
);
407 bool (*bdrv_debug_is_suspended
)(BlockDriverState
*bs
, const char *tag
);
409 void (*bdrv_refresh_limits
)(BlockDriverState
*bs
, Error
**errp
);
412 * Returns 1 if newly created images are guaranteed to contain only
413 * zeros, 0 otherwise.
415 int (*bdrv_has_zero_init
)(BlockDriverState
*bs
);
417 /* Remove fd handlers, timers, and other event loop callbacks so the event
418 * loop is no longer in use. Called with no in-flight requests and in
419 * depth-first traversal order with parents before child nodes.
421 void (*bdrv_detach_aio_context
)(BlockDriverState
*bs
);
423 /* Add fd handlers, timers, and other event loop callbacks so I/O requests
424 * can be processed again. Called with no in-flight requests and in
425 * depth-first traversal order with child nodes before parent nodes.
427 void (*bdrv_attach_aio_context
)(BlockDriverState
*bs
,
428 AioContext
*new_context
);
430 /* io queue for linux-aio */
431 void (*bdrv_io_plug
)(BlockDriverState
*bs
);
432 void (*bdrv_io_unplug
)(BlockDriverState
*bs
);
435 * Try to get @bs's logical and physical block size.
436 * On success, store them in @bsz and return zero.
437 * On failure, return negative errno.
439 int (*bdrv_probe_blocksizes
)(BlockDriverState
*bs
, BlockSizes
*bsz
);
441 * Try to get @bs's geometry (cyls, heads, sectors)
442 * On success, store them in @geo and return 0.
443 * On failure return -errno.
444 * Only drivers that want to override guest geometry implement this
445 * callback; see hd_geometry_guess().
447 int (*bdrv_probe_geometry
)(BlockDriverState
*bs
, HDGeometry
*geo
);
450 * bdrv_co_drain_begin is called if implemented in the beginning of a
451 * drain operation to drain and stop any internal sources of requests in
453 * bdrv_co_drain_end is called if implemented at the end of the drain.
455 * They should be used by the driver to e.g. manage scheduled I/O
456 * requests, or toggle an internal state. After the end of the drain new
457 * requests will continue normally.
459 void coroutine_fn (*bdrv_co_drain_begin
)(BlockDriverState
*bs
);
460 void coroutine_fn (*bdrv_co_drain_end
)(BlockDriverState
*bs
);
462 void (*bdrv_add_child
)(BlockDriverState
*parent
, BlockDriverState
*child
,
464 void (*bdrv_del_child
)(BlockDriverState
*parent
, BdrvChild
*child
,
468 * Informs the block driver that a permission change is intended. The
469 * driver checks whether the change is permissible and may take other
470 * preparations for the change (e.g. get file system locks). This operation
471 * is always followed either by a call to either .bdrv_set_perm or
472 * .bdrv_abort_perm_update.
474 * Checks whether the requested set of cumulative permissions in @perm
475 * can be granted for accessing @bs and whether no other users are using
476 * permissions other than those given in @shared (both arguments take
477 * BLK_PERM_* bitmasks).
479 * If both conditions are met, 0 is returned. Otherwise, -errno is returned
480 * and errp is set to an error describing the conflict.
482 int (*bdrv_check_perm
)(BlockDriverState
*bs
, uint64_t perm
,
483 uint64_t shared
, Error
**errp
);
486 * Called to inform the driver that the set of cumulative set of used
487 * permissions for @bs has changed to @perm, and the set of sharable
488 * permission to @shared. The driver can use this to propagate changes to
489 * its children (i.e. request permissions only if a parent actually needs
492 * This function is only invoked after bdrv_check_perm(), so block drivers
493 * may rely on preparations made in their .bdrv_check_perm implementation.
495 void (*bdrv_set_perm
)(BlockDriverState
*bs
, uint64_t perm
, uint64_t shared
);
498 * Called to inform the driver that after a previous bdrv_check_perm()
499 * call, the permission update is not performed and any preparations made
500 * for it (e.g. taken file locks) need to be undone.
502 * This function can be called even for nodes that never saw a
503 * bdrv_check_perm() call. It is a no-op then.
505 void (*bdrv_abort_perm_update
)(BlockDriverState
*bs
);
508 * Returns in @nperm and @nshared the permissions that the driver for @bs
509 * needs on its child @c, based on the cumulative permissions requested by
510 * the parents in @parent_perm and @parent_shared.
512 * If @c is NULL, return the permissions for attaching a new child for the
515 * If @reopen_queue is non-NULL, don't return the currently needed
516 * permissions, but those that will be needed after applying the
519 void (*bdrv_child_perm
)(BlockDriverState
*bs
, BdrvChild
*c
,
520 const BdrvChildRole
*role
,
521 BlockReopenQueue
*reopen_queue
,
522 uint64_t parent_perm
, uint64_t parent_shared
,
523 uint64_t *nperm
, uint64_t *nshared
);
526 * Bitmaps should be marked as 'IN_USE' in the image on reopening image
527 * as rw. This handler should realize it. It also should unset readonly
528 * field of BlockDirtyBitmap's in case of success.
530 int (*bdrv_reopen_bitmaps_rw
)(BlockDriverState
*bs
, Error
**errp
);
531 bool (*bdrv_can_store_new_dirty_bitmap
)(BlockDriverState
*bs
,
533 uint32_t granularity
,
535 void (*bdrv_remove_persistent_dirty_bitmap
)(BlockDriverState
*bs
,
540 * Register/unregister a buffer for I/O. For example, when the driver is
541 * interested to know the memory areas that will later be used in iovs, so
542 * that it can do IOMMU mapping with VFIO etc., in order to get better
543 * performance. In the case of VFIO drivers, this callback is used to do
544 * DMA mapping for hot buffers.
546 void (*bdrv_register_buf
)(BlockDriverState
*bs
, void *host
, size_t size
);
547 void (*bdrv_unregister_buf
)(BlockDriverState
*bs
, void *host
);
548 QLIST_ENTRY(BlockDriver
) list
;
550 /* Pointer to a NULL-terminated array of names of strong options
551 * that can be specified for bdrv_open(). A strong option is one
552 * that changes the data of a BDS.
553 * If this pointer is NULL, the array is considered empty.
554 * "filename" and "driver" are always considered strong. */
555 const char *const *strong_runtime_opts
;
558 typedef struct BlockLimits
{
559 /* Alignment requirement, in bytes, for offset/length of I/O
560 * requests. Must be a power of 2 less than INT_MAX; defaults to
561 * 1 for drivers with modern byte interfaces, and to 512
563 uint32_t request_alignment
;
565 /* Maximum number of bytes that can be discarded at once (since it
566 * is signed, it must be < 2G, if set). Must be multiple of
567 * pdiscard_alignment, but need not be power of 2. May be 0 if no
568 * inherent 32-bit limit */
569 int32_t max_pdiscard
;
571 /* Optimal alignment for discard requests in bytes. A power of 2
572 * is best but not mandatory. Must be a multiple of
573 * bl.request_alignment, and must be less than max_pdiscard if
574 * that is set. May be 0 if bl.request_alignment is good enough */
575 uint32_t pdiscard_alignment
;
577 /* Maximum number of bytes that can zeroized at once (since it is
578 * signed, it must be < 2G, if set). Must be multiple of
579 * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */
580 int32_t max_pwrite_zeroes
;
582 /* Optimal alignment for write zeroes requests in bytes. A power
583 * of 2 is best but not mandatory. Must be a multiple of
584 * bl.request_alignment, and must be less than max_pwrite_zeroes
585 * if that is set. May be 0 if bl.request_alignment is good
587 uint32_t pwrite_zeroes_alignment
;
589 /* Optimal transfer length in bytes. A power of 2 is best but not
590 * mandatory. Must be a multiple of bl.request_alignment, or 0 if
591 * no preferred size */
592 uint32_t opt_transfer
;
594 /* Maximal transfer length in bytes. Need not be power of 2, but
595 * must be multiple of opt_transfer and bl.request_alignment, or 0
596 * for no 32-bit limit. For now, anything larger than INT_MAX is
598 uint32_t max_transfer
;
600 /* memory alignment, in bytes so that no bounce buffer is needed */
601 size_t min_mem_alignment
;
603 /* memory alignment, in bytes, for bounce buffer */
604 size_t opt_mem_alignment
;
606 /* maximum number of iovec elements */
610 typedef struct BdrvOpBlocker BdrvOpBlocker
;
612 typedef struct BdrvAioNotifier
{
613 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
);
614 void (*detach_aio_context
)(void *opaque
);
619 QLIST_ENTRY(BdrvAioNotifier
) list
;
622 struct BdrvChildRole
{
623 /* If true, bdrv_replace_node() doesn't change the node this BdrvChild
627 /* If true, the parent is a BlockDriverState and bdrv_next_all_states()
628 * will return it. This information is used for drain_all, where every node
629 * will be drained separately, so the drain only needs to be propagated to
630 * non-BDS parents. */
633 void (*inherit_options
)(int *child_flags
, QDict
*child_options
,
634 int parent_flags
, QDict
*parent_options
);
636 void (*change_media
)(BdrvChild
*child
, bool load
);
637 void (*resize
)(BdrvChild
*child
);
639 /* Returns a name that is supposedly more useful for human users than the
640 * node name for identifying the node in question (in particular, a BB
641 * name), or NULL if the parent can't provide a better name. */
642 const char *(*get_name
)(BdrvChild
*child
);
644 /* Returns a malloced string that describes the parent of the child for a
645 * human reader. This could be a node-name, BlockBackend name, qdev ID or
646 * QOM path of the device owning the BlockBackend, job type and ID etc. The
647 * caller is responsible for freeing the memory. */
648 char *(*get_parent_desc
)(BdrvChild
*child
);
651 * If this pair of functions is implemented, the parent doesn't issue new
652 * requests after returning from .drained_begin() until .drained_end() is
655 * These functions must not change the graph (and therefore also must not
656 * call aio_poll(), which could change the graph indirectly).
658 * Note that this can be nested. If drained_begin() was called twice, new
659 * I/O is allowed only after drained_end() was called twice, too.
661 void (*drained_begin
)(BdrvChild
*child
);
662 void (*drained_end
)(BdrvChild
*child
);
665 * Returns whether the parent has pending requests for the child. This
666 * callback is polled after .drained_begin() has been called until all
667 * activity on the child has stopped.
669 bool (*drained_poll
)(BdrvChild
*child
);
671 /* Notifies the parent that the child has been activated/inactivated (e.g.
672 * when migration is completing) and it can start/stop requesting
673 * permissions and doing I/O on it. */
674 void (*activate
)(BdrvChild
*child
, Error
**errp
);
675 int (*inactivate
)(BdrvChild
*child
);
677 void (*attach
)(BdrvChild
*child
);
678 void (*detach
)(BdrvChild
*child
);
680 /* Notifies the parent that the filename of its child has changed (e.g.
681 * because the direct child was removed from the backing chain), so that it
682 * can update its reference. */
683 int (*update_filename
)(BdrvChild
*child
, BlockDriverState
*new_base
,
684 const char *filename
, Error
**errp
);
687 extern const BdrvChildRole child_file
;
688 extern const BdrvChildRole child_format
;
689 extern const BdrvChildRole child_backing
;
692 BlockDriverState
*bs
;
694 const BdrvChildRole
*role
;
698 * Granted permissions for operating on this BdrvChild (BLK_PERM_* bitmask)
703 * Permissions that can still be granted to other users of @bs while this
704 * BdrvChild is still attached to it. (BLK_PERM_* bitmask)
706 uint64_t shared_perm
;
708 /* backup of permissions during permission update procedure */
709 bool has_backup_perm
;
710 uint64_t backup_perm
;
711 uint64_t backup_shared_perm
;
713 QLIST_ENTRY(BdrvChild
) next
;
714 QLIST_ENTRY(BdrvChild
) next_parent
;
718 * Note: the function bdrv_append() copies and swaps contents of
719 * BlockDriverStates, so if you add new fields to this struct, please
720 * inspect bdrv_append() to determine if the new fields need to be
723 struct BlockDriverState
{
724 /* Protected by big QEMU lock or read-only after opening. No special
725 * locking needed during I/O...
727 int open_flags
; /* flags used to open the file, re-used for re-open */
728 bool read_only
; /* if true, the media is read only */
729 bool encrypted
; /* if true, the media is encrypted */
730 bool sg
; /* if true, the device is a /dev/sg* */
731 bool probed
; /* if true, format was probed rather than specified */
732 bool force_share
; /* if true, always allow all shared permissions */
733 bool implicit
; /* if true, this filter node was automatically inserted */
735 BlockDriver
*drv
; /* NULL means no media */
738 AioContext
*aio_context
; /* event loop used for fd handlers, timers, etc */
739 /* long-running tasks intended to always use the same AioContext as this
740 * BDS may register themselves in this list to be notified of changes
741 * regarding this BDS's context */
742 QLIST_HEAD(, BdrvAioNotifier
) aio_notifiers
;
743 bool walking_aio_notifiers
; /* to make removal during iteration safe */
745 char filename
[PATH_MAX
];
746 char backing_file
[PATH_MAX
]; /* if non zero, the image is a diff of
748 /* The backing filename indicated by the image header; if we ever
749 * open this file, then this is replaced by the resulting BDS's
750 * filename (i.e. after a bdrv_refresh_filename() run). */
751 char auto_backing_file
[PATH_MAX
];
752 char backing_format
[16]; /* if non-zero and backing_file exists */
754 QDict
*full_open_options
;
755 char exact_filename
[PATH_MAX
];
763 /* Flags honored during pwrite (so far: BDRV_REQ_FUA,
764 * BDRV_REQ_WRITE_UNCHANGED).
765 * If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those
766 * writes will be issued as normal writes without the flag set.
767 * This is important to note for drivers that do not explicitly
768 * request a WRITE permission for their children and instead take
769 * the same permissions as their parent did (this is commonly what
770 * block filters do). Such drivers have to be aware that the
771 * parent may have taken a WRITE_UNCHANGED permission only and is
772 * issuing such requests. Drivers either must make sure that
773 * these requests do not result in plain WRITE accesses (usually
774 * by supporting BDRV_REQ_WRITE_UNCHANGED, and then forwarding
775 * every incoming write request as-is, including potentially that
776 * flag), or they have to explicitly take the WRITE permission for
778 unsigned int supported_write_flags
;
779 /* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
780 * BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */
781 unsigned int supported_zero_flags
;
783 /* the following member gives a name to every node on the bs graph. */
785 /* element of the list of named nodes building the graph */
786 QTAILQ_ENTRY(BlockDriverState
) node_list
;
787 /* element of the list of all BlockDriverStates (all_bdrv_states) */
788 QTAILQ_ENTRY(BlockDriverState
) bs_list
;
789 /* element of the list of monitor-owned BDS */
790 QTAILQ_ENTRY(BlockDriverState
) monitor_list
;
793 /* operation blockers */
794 QLIST_HEAD(, BdrvOpBlocker
) op_blockers
[BLOCK_OP_TYPE_MAX
];
796 /* long-running background operation */
799 /* The node that this node inherited default options from (and a reopen on
800 * which can affect this node by changing these defaults). This is always a
801 * parent node of this node. */
802 BlockDriverState
*inherits_from
;
803 QLIST_HEAD(, BdrvChild
) children
;
804 QLIST_HEAD(, BdrvChild
) parents
;
807 QDict
*explicit_options
;
808 BlockdevDetectZeroesOptions detect_zeroes
;
810 /* The error object in use for blocking operations on backing_hd */
811 Error
*backing_blocker
;
813 /* Protected by AioContext lock */
815 /* If we are reading a disk image, give its size in sectors.
816 * Generally read-only; it is written to by load_snapshot and
817 * save_snaphost, but the block layer is quiescent during those.
819 int64_t total_sectors
;
821 /* Callback before write request is processed */
822 NotifierWithReturnList before_write_notifiers
;
824 /* threshold limit for writes, in bytes. "High water mark". */
825 uint64_t write_threshold_offset
;
826 NotifierWithReturn write_threshold_notifier
;
828 /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
829 * Reading from the list can be done with either the BQL or the
830 * dirty_bitmap_mutex. Modifying a bitmap only requires
831 * dirty_bitmap_mutex. */
832 QemuMutex dirty_bitmap_mutex
;
833 QLIST_HEAD(, BdrvDirtyBitmap
) dirty_bitmaps
;
835 /* Offset after the highest byte written to */
836 Stat64 wr_highest_offset
;
838 /* If true, copy read backing sectors into image. Can be >1 if more
839 * than one client has requested copy-on-read. Accessed with atomic
844 /* number of in-flight requests; overall and serialising.
845 * Accessed with atomic ops.
847 unsigned int in_flight
;
848 unsigned int serialising_in_flight
;
850 /* counter for nested bdrv_io_plug.
851 * Accessed with atomic ops.
855 /* do we need to tell the quest if we have a volatile write cache? */
856 int enable_write_cache
;
858 /* Accessed with atomic ops. */
860 int recursive_quiesce_counter
;
862 unsigned int write_gen
; /* Current data generation */
864 /* Protected by reqs_lock. */
866 QLIST_HEAD(, BdrvTrackedRequest
) tracked_requests
;
867 CoQueue flush_queue
; /* Serializing flush queue */
868 bool active_flush_req
; /* Flush request in flight? */
870 /* Only read/written by whoever has set active_flush_req to true. */
871 unsigned int flushed_gen
; /* Flushed write generation */
874 struct BlockBackendRootState
{
877 BlockdevDetectZeroesOptions detect_zeroes
;
880 typedef enum BlockMirrorBackingMode
{
881 /* Reuse the existing backing chain from the source for the target.
882 * - sync=full: Set backing BDS to NULL.
883 * - sync=top: Use source's backing BDS.
884 * - sync=none: Use source as the backing BDS. */
885 MIRROR_SOURCE_BACKING_CHAIN
,
887 /* Open the target's backing chain completely anew */
888 MIRROR_OPEN_BACKING_CHAIN
,
890 /* Do not change the target's backing BDS after job completion */
891 MIRROR_LEAVE_BACKING_CHAIN
,
892 } BlockMirrorBackingMode
;
894 static inline BlockDriverState
*backing_bs(BlockDriverState
*bs
)
896 return bs
->backing
? bs
->backing
->bs
: NULL
;
900 /* Essential block drivers which must always be statically linked into qemu, and
901 * which therefore can be accessed without using bdrv_find_format() */
902 extern BlockDriver bdrv_file
;
903 extern BlockDriver bdrv_raw
;
904 extern BlockDriver bdrv_qcow2
;
906 int coroutine_fn
bdrv_co_preadv(BdrvChild
*child
,
907 int64_t offset
, unsigned int bytes
, QEMUIOVector
*qiov
,
908 BdrvRequestFlags flags
);
909 int coroutine_fn
bdrv_co_pwritev(BdrvChild
*child
,
910 int64_t offset
, unsigned int bytes
, QEMUIOVector
*qiov
,
911 BdrvRequestFlags flags
);
913 extern unsigned int bdrv_drain_all_count
;
914 void bdrv_apply_subtree_drain(BdrvChild
*child
, BlockDriverState
*new_parent
);
915 void bdrv_unapply_subtree_drain(BdrvChild
*child
, BlockDriverState
*old_parent
);
917 int get_tmp_filename(char *filename
, int size
);
918 BlockDriver
*bdrv_probe_all(const uint8_t *buf
, int buf_size
,
919 const char *filename
);
921 void bdrv_parse_filename_strip_prefix(const char *filename
, const char *prefix
,
926 * bdrv_add_before_write_notifier:
928 * Register a callback that is invoked before write requests are processed but
929 * after any throttling or waiting for overlapping requests.
931 void bdrv_add_before_write_notifier(BlockDriverState
*bs
,
932 NotifierWithReturn
*notifier
);
935 * bdrv_detach_aio_context:
937 * May be called from .bdrv_detach_aio_context() to detach children from the
938 * current #AioContext. This is only needed by block drivers that manage their
939 * own children. Both ->file and ->backing are automatically handled and
940 * block drivers should not call this function on them explicitly.
942 void bdrv_detach_aio_context(BlockDriverState
*bs
);
945 * bdrv_attach_aio_context:
947 * May be called from .bdrv_attach_aio_context() to attach children to the new
948 * #AioContext. This is only needed by block drivers that manage their own
949 * children. Both ->file and ->backing are automatically handled and block
950 * drivers should not call this function on them explicitly.
952 void bdrv_attach_aio_context(BlockDriverState
*bs
,
953 AioContext
*new_context
);
956 * bdrv_add_aio_context_notifier:
958 * If a long-running job intends to be always run in the same AioContext as a
959 * certain BDS, it may use this function to be notified of changes regarding the
960 * association of the BDS to an AioContext.
962 * attached_aio_context() is called after the target BDS has been attached to a
963 * new AioContext; detach_aio_context() is called before the target BDS is being
964 * detached from its old AioContext.
966 void bdrv_add_aio_context_notifier(BlockDriverState
*bs
,
967 void (*attached_aio_context
)(AioContext
*new_context
, void *opaque
),
968 void (*detach_aio_context
)(void *opaque
), void *opaque
);
971 * bdrv_remove_aio_context_notifier:
973 * Unsubscribe of change notifications regarding the BDS's AioContext. The
974 * parameters given here have to be the same as those given to
975 * bdrv_add_aio_context_notifier().
977 void bdrv_remove_aio_context_notifier(BlockDriverState
*bs
,
978 void (*aio_context_attached
)(AioContext
*,
980 void (*aio_context_detached
)(void *),
985 * @bs: The BlockDriverState for which an I/O operation has been completed.
987 * Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During
988 * synchronous I/O on a BlockDriverState that is attached to another
989 * I/O thread, the main thread lets the I/O thread's event loop run,
990 * waiting for the I/O operation to complete. A bdrv_wakeup will wake
991 * up the main thread if necessary.
993 * Manual calls to bdrv_wakeup are rarely necessary, because
994 * bdrv_dec_in_flight already calls it.
996 void bdrv_wakeup(BlockDriverState
*bs
);
999 int is_windows_drive(const char *filename
);
1004 * @job_id: The id of the newly-created job, or %NULL to use the
1005 * device name of @bs.
1006 * @bs: Block device to operate on.
1007 * @base: Block device that will become the new base, or %NULL to
1008 * flatten the whole backing file chain onto @bs.
1009 * @backing_file_str: The file name that will be written to @bs as the
1010 * the new backing file if the job completes. Ignored if @base is %NULL.
1011 * @creation_flags: Flags that control the behavior of the Job lifetime.
1012 * See @BlockJobCreateFlags
1013 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
1014 * @on_error: The action to take upon error.
1015 * @errp: Error object.
1017 * Start a streaming operation on @bs. Clusters that are unallocated
1018 * in @bs, but allocated in any image between @base and @bs (both
1019 * exclusive) will be written to @bs. At the end of a successful
1020 * streaming job, the backing file of @bs will be changed to
1021 * @backing_file_str in the written image and to @base in the live
1024 void stream_start(const char *job_id
, BlockDriverState
*bs
,
1025 BlockDriverState
*base
, const char *backing_file_str
,
1026 int creation_flags
, int64_t speed
,
1027 BlockdevOnError on_error
, Error
**errp
);
1031 * @job_id: The id of the newly-created job, or %NULL to use the
1032 * device name of @bs.
1033 * @bs: Active block device.
1034 * @top: Top block device to be committed.
1035 * @base: Block device that will be written into, and become the new top.
1036 * @creation_flags: Flags that control the behavior of the Job lifetime.
1037 * See @BlockJobCreateFlags
1038 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
1039 * @on_error: The action to take upon error.
1040 * @backing_file_str: String to use as the backing file in @top's overlay
1041 * @filter_node_name: The node name that should be assigned to the filter
1042 * driver that the commit job inserts into the graph above @top. NULL means
1043 * that a node name should be autogenerated.
1044 * @errp: Error object.
1047 void commit_start(const char *job_id
, BlockDriverState
*bs
,
1048 BlockDriverState
*base
, BlockDriverState
*top
,
1049 int creation_flags
, int64_t speed
,
1050 BlockdevOnError on_error
, const char *backing_file_str
,
1051 const char *filter_node_name
, Error
**errp
);
1053 * commit_active_start:
1054 * @job_id: The id of the newly-created job, or %NULL to use the
1055 * device name of @bs.
1056 * @bs: Active block device to be committed.
1057 * @base: Block device that will be written into, and become the new top.
1058 * @creation_flags: Flags that control the behavior of the Job lifetime.
1059 * See @BlockJobCreateFlags
1060 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
1061 * @on_error: The action to take upon error.
1062 * @filter_node_name: The node name that should be assigned to the filter
1063 * driver that the commit job inserts into the graph above @bs. NULL means that
1064 * a node name should be autogenerated.
1065 * @cb: Completion function for the job.
1066 * @opaque: Opaque pointer value passed to @cb.
1067 * @auto_complete: Auto complete the job.
1068 * @errp: Error object.
1071 void commit_active_start(const char *job_id
, BlockDriverState
*bs
,
1072 BlockDriverState
*base
, int creation_flags
,
1073 int64_t speed
, BlockdevOnError on_error
,
1074 const char *filter_node_name
,
1075 BlockCompletionFunc
*cb
, void *opaque
,
1076 bool auto_complete
, Error
**errp
);
1079 * @job_id: The id of the newly-created job, or %NULL to use the
1080 * device name of @bs.
1081 * @bs: Block device to operate on.
1082 * @target: Block device to write to.
1083 * @replaces: Block graph node name to replace once the mirror is done. Can
1084 * only be used when full mirroring is selected.
1085 * @creation_flags: Flags that control the behavior of the Job lifetime.
1086 * See @BlockJobCreateFlags
1087 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
1088 * @granularity: The chosen granularity for the dirty bitmap.
1089 * @buf_size: The amount of data that can be in flight at one time.
1090 * @mode: Whether to collapse all images in the chain to the target.
1091 * @backing_mode: How to establish the target's backing chain after completion.
1092 * @on_source_error: The action to take upon error reading from the source.
1093 * @on_target_error: The action to take upon error writing to the target.
1094 * @unmap: Whether to unmap target where source sectors only contain zeroes.
1095 * @filter_node_name: The node name that should be assigned to the filter
1096 * driver that the mirror job inserts into the graph above @bs. NULL means that
1097 * a node name should be autogenerated.
1098 * @copy_mode: When to trigger writes to the target.
1099 * @errp: Error object.
1101 * Start a mirroring operation on @bs. Clusters that are allocated
1102 * in @bs will be written to @target until the job is cancelled or
1103 * manually completed. At the end of a successful mirroring job,
1104 * @bs will be switched to read from @target.
1106 void mirror_start(const char *job_id
, BlockDriverState
*bs
,
1107 BlockDriverState
*target
, const char *replaces
,
1108 int creation_flags
, int64_t speed
,
1109 uint32_t granularity
, int64_t buf_size
,
1110 MirrorSyncMode mode
, BlockMirrorBackingMode backing_mode
,
1111 BlockdevOnError on_source_error
,
1112 BlockdevOnError on_target_error
,
1113 bool unmap
, const char *filter_node_name
,
1114 MirrorCopyMode copy_mode
, Error
**errp
);
1117 * backup_job_create:
1118 * @job_id: The id of the newly-created job, or %NULL to use the
1119 * device name of @bs.
1120 * @bs: Block device to operate on.
1121 * @target: Block device to write to.
1122 * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
1123 * @sync_mode: What parts of the disk image should be copied to the destination.
1124 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
1125 * @on_source_error: The action to take upon error reading from the source.
1126 * @on_target_error: The action to take upon error writing to the target.
1127 * @creation_flags: Flags that control the behavior of the Job lifetime.
1128 * See @BlockJobCreateFlags
1129 * @cb: Completion function for the job.
1130 * @opaque: Opaque pointer value passed to @cb.
1131 * @txn: Transaction that this job is part of (may be NULL).
1133 * Create a backup operation on @bs. Clusters in @bs are written to @target
1134 * until the job is cancelled or manually completed.
1136 BlockJob
*backup_job_create(const char *job_id
, BlockDriverState
*bs
,
1137 BlockDriverState
*target
, int64_t speed
,
1138 MirrorSyncMode sync_mode
,
1139 BdrvDirtyBitmap
*sync_bitmap
,
1141 BlockdevOnError on_source_error
,
1142 BlockdevOnError on_target_error
,
1144 BlockCompletionFunc
*cb
, void *opaque
,
1145 JobTxn
*txn
, Error
**errp
);
1147 void hmp_drive_add_node(Monitor
*mon
, const char *optstr
);
1149 BdrvChild
*bdrv_root_attach_child(BlockDriverState
*child_bs
,
1150 const char *child_name
,
1151 const BdrvChildRole
*child_role
,
1152 uint64_t perm
, uint64_t shared_perm
,
1153 void *opaque
, Error
**errp
);
1154 void bdrv_root_unref_child(BdrvChild
*child
);
1156 int bdrv_child_try_set_perm(BdrvChild
*c
, uint64_t perm
, uint64_t shared
,
1159 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by
1160 * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to
1162 void bdrv_filter_default_perms(BlockDriverState
*bs
, BdrvChild
*c
,
1163 const BdrvChildRole
*role
,
1164 BlockReopenQueue
*reopen_queue
,
1165 uint64_t perm
, uint64_t shared
,
1166 uint64_t *nperm
, uint64_t *nshared
);
1168 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by
1169 * (non-raw) image formats: Like above for bs->backing, but for bs->file it
1170 * requires WRITE | RESIZE for read-write images, always requires
1171 * CONSISTENT_READ and doesn't share WRITE. */
1172 void bdrv_format_default_perms(BlockDriverState
*bs
, BdrvChild
*c
,
1173 const BdrvChildRole
*role
,
1174 BlockReopenQueue
*reopen_queue
,
1175 uint64_t perm
, uint64_t shared
,
1176 uint64_t *nperm
, uint64_t *nshared
);
1179 * Default implementation for drivers to pass bdrv_co_block_status() to
1182 int coroutine_fn
bdrv_co_block_status_from_file(BlockDriverState
*bs
,
1188 BlockDriverState
**file
);
1190 * Default implementation for drivers to pass bdrv_co_block_status() to
1191 * their backing file.
1193 int coroutine_fn
bdrv_co_block_status_from_backing(BlockDriverState
*bs
,
1199 BlockDriverState
**file
);
1200 const char *bdrv_get_parent_name(const BlockDriverState
*bs
);
1201 void blk_dev_change_media_cb(BlockBackend
*blk
, bool load
, Error
**errp
);
1202 bool blk_dev_has_removable_media(BlockBackend
*blk
);
1203 bool blk_dev_has_tray(BlockBackend
*blk
);
1204 void blk_dev_eject_request(BlockBackend
*blk
, bool force
);
1205 bool blk_dev_is_tray_open(BlockBackend
*blk
);
1206 bool blk_dev_is_medium_locked(BlockBackend
*blk
);
1208 void bdrv_set_dirty(BlockDriverState
*bs
, int64_t offset
, int64_t bytes
);
1210 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap
*bitmap
, HBitmap
**out
);
1211 void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap
*bitmap
, HBitmap
*backup
);
1213 void bdrv_inc_in_flight(BlockDriverState
*bs
);
1214 void bdrv_dec_in_flight(BlockDriverState
*bs
);
1216 void blockdev_close_all_bdrv_states(void);
1218 int coroutine_fn
bdrv_co_copy_range_from(BdrvChild
*src
, uint64_t src_offset
,
1219 BdrvChild
*dst
, uint64_t dst_offset
,
1221 BdrvRequestFlags read_flags
,
1222 BdrvRequestFlags write_flags
);
1223 int coroutine_fn
bdrv_co_copy_range_to(BdrvChild
*src
, uint64_t src_offset
,
1224 BdrvChild
*dst
, uint64_t dst_offset
,
1226 BdrvRequestFlags read_flags
,
1227 BdrvRequestFlags write_flags
);
1229 int refresh_total_sectors(BlockDriverState
*bs
, int64_t hint
);
1231 #endif /* BLOCK_INT_H */