5 #include "qemu-common.h"
6 #include "qemu/option.h"
7 #include "qemu/coroutine.h"
8 #include "block/accounting.h"
9 #include "qapi/qmp/qobject.h"
10 #include "qapi-types.h"
13 typedef struct BlockDriver BlockDriver
;
14 typedef struct BlockJob BlockJob
;
15 typedef struct BdrvChild BdrvChild
;
16 typedef struct BdrvChildRole BdrvChildRole
;
17 typedef struct BlockJobTxn BlockJobTxn
;
19 typedef struct BlockDriverInfo
{
20 /* in bytes, 0 if irrelevant */
22 /* offset at which the VM state can be saved (0 if not possible) */
23 int64_t vm_state_offset
;
26 * True if unallocated blocks read back as zeroes. This is equivalent
27 * to the LBPRZ flag in the SCSI logical block provisioning page.
29 bool unallocated_blocks_are_zero
;
31 * True if the driver can optimize writing zeroes by unmapping
32 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
33 * with the difference that in qemu a discard is allowed to silently
34 * fail. Therefore we have to use bdrv_write_zeroes with the
35 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
36 * After this call the driver has to guarantee that the contents read
37 * back as zero. It is additionally required that the block device is
38 * opened with BDRV_O_UNMAP flag for this to work.
40 bool can_write_zeroes_with_unmap
;
42 * True if this block driver only supports compressed writes
44 bool needs_compressed_writes
;
47 typedef struct BlockFragInfo
{
48 uint64_t allocated_clusters
;
49 uint64_t total_clusters
;
50 uint64_t fragmented_clusters
;
51 uint64_t compressed_clusters
;
55 BDRV_REQ_COPY_ON_READ
= 0x1,
56 BDRV_REQ_ZERO_WRITE
= 0x2,
57 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
58 * is allowed to optimize a write zeroes request by unmapping (discarding)
59 * blocks if it is guaranteed that the result will read back as
60 * zeroes. The flag is only passed to the driver if the block device is
61 * opened with BDRV_O_UNMAP.
63 BDRV_REQ_MAY_UNMAP
= 0x4,
64 BDRV_REQ_NO_SERIALISING
= 0x8,
67 typedef struct BlockSizes
{
72 typedef struct HDGeometry
{
78 #define BDRV_O_RDWR 0x0002
79 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
80 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
81 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
82 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
83 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
84 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
85 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
86 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
87 #define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */
88 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
89 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
90 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
91 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
92 select an appropriate protocol driver,
93 ignoring the format layer */
95 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
98 /* Option names of options parsed by the block layer */
100 #define BDRV_OPT_CACHE_WB "cache.writeback"
101 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
102 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
105 #define BDRV_SECTOR_BITS 9
106 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
107 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
109 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
110 INT_MAX >> BDRV_SECTOR_BITS)
113 * Allocation status flags
114 * BDRV_BLOCK_DATA: data is read from bs->file or another file
115 * BDRV_BLOCK_ZERO: sectors read as zero
116 * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data
117 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
118 * layer (as opposed to the backing file)
119 * BDRV_BLOCK_RAW: used internally to indicate that the request
120 * was answered by the raw driver and that one
121 * should look in bs->file directly.
123 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
124 * bs->file where sector data can be read from as raw data.
126 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
128 * DATA ZERO OFFSET_VALID
129 * t t t sectors read as zero, bs->file is zero at offset
130 * t f t sectors read as valid from bs->file at offset
131 * f t t sectors preallocated, read as zero, bs->file not
132 * necessarily zero at offset
133 * f f t sectors preallocated but read from backing_hd,
134 * bs->file contains garbage at offset
135 * t t f sectors preallocated, read as zero, unknown offset
136 * t f f sectors read from unknown file or offset
137 * f t f not allocated or unknown offset, read as zero
138 * f f f not allocated or unknown offset, read from backing_hd
140 #define BDRV_BLOCK_DATA 0x01
141 #define BDRV_BLOCK_ZERO 0x02
142 #define BDRV_BLOCK_OFFSET_VALID 0x04
143 #define BDRV_BLOCK_RAW 0x08
144 #define BDRV_BLOCK_ALLOCATED 0x10
145 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
147 typedef QSIMPLEQ_HEAD(BlockReopenQueue
, BlockReopenQueueEntry
) BlockReopenQueue
;
149 typedef struct BDRVReopenState
{
150 BlockDriverState
*bs
;
153 QDict
*explicit_options
;
158 * Block operation types
160 typedef enum BlockOpType
{
161 BLOCK_OP_TYPE_BACKUP_SOURCE
,
162 BLOCK_OP_TYPE_BACKUP_TARGET
,
163 BLOCK_OP_TYPE_CHANGE
,
164 BLOCK_OP_TYPE_COMMIT_SOURCE
,
165 BLOCK_OP_TYPE_COMMIT_TARGET
,
166 BLOCK_OP_TYPE_DATAPLANE
,
167 BLOCK_OP_TYPE_DRIVE_DEL
,
169 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
170 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
,
171 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
,
172 BLOCK_OP_TYPE_MIRROR
,
173 BLOCK_OP_TYPE_RESIZE
,
174 BLOCK_OP_TYPE_STREAM
,
175 BLOCK_OP_TYPE_REPLACE
,
179 void bdrv_info_print(Monitor
*mon
, const QObject
*data
);
180 void bdrv_info(Monitor
*mon
, QObject
**ret_data
);
181 void bdrv_stats_print(Monitor
*mon
, const QObject
*data
);
182 void bdrv_info_stats(Monitor
*mon
, QObject
**ret_data
);
184 /* disk I/O throttling */
185 void bdrv_io_limits_enable(BlockDriverState
*bs
, const char *group
);
186 void bdrv_io_limits_disable(BlockDriverState
*bs
);
187 void bdrv_io_limits_update_group(BlockDriverState
*bs
, const char *group
);
189 void bdrv_init(void);
190 void bdrv_init_with_whitelist(void);
191 BlockDriver
*bdrv_find_protocol(const char *filename
,
192 bool allow_protocol_prefix
,
194 BlockDriver
*bdrv_find_format(const char *format_name
);
195 int bdrv_create(BlockDriver
*drv
, const char* filename
,
196 QemuOpts
*opts
, Error
**errp
);
197 int bdrv_create_file(const char *filename
, QemuOpts
*opts
, Error
**errp
);
198 BlockDriverState
*bdrv_new_root(void);
199 BlockDriverState
*bdrv_new(void);
200 void bdrv_make_anon(BlockDriverState
*bs
);
201 void bdrv_append(BlockDriverState
*bs_new
, BlockDriverState
*bs_top
);
202 void bdrv_replace_in_backing_chain(BlockDriverState
*old
,
203 BlockDriverState
*new);
205 int bdrv_parse_cache_flags(const char *mode
, int *flags
);
206 int bdrv_parse_discard_flags(const char *mode
, int *flags
);
207 BdrvChild
*bdrv_open_child(const char *filename
,
208 QDict
*options
, const char *bdref_key
,
209 BlockDriverState
* parent
,
210 const BdrvChildRole
*child_role
,
211 bool allow_none
, Error
**errp
);
212 void bdrv_set_backing_hd(BlockDriverState
*bs
, BlockDriverState
*backing_hd
);
213 int bdrv_open_backing_file(BlockDriverState
*bs
, QDict
*parent_options
,
214 const char *bdref_key
, Error
**errp
);
215 int bdrv_append_temp_snapshot(BlockDriverState
*bs
, int flags
, Error
**errp
);
216 int bdrv_open(BlockDriverState
**pbs
, const char *filename
,
217 const char *reference
, QDict
*options
, int flags
, Error
**errp
);
218 BlockReopenQueue
*bdrv_reopen_queue(BlockReopenQueue
*bs_queue
,
219 BlockDriverState
*bs
,
220 QDict
*options
, int flags
);
221 int bdrv_reopen_multiple(BlockReopenQueue
*bs_queue
, Error
**errp
);
222 int bdrv_reopen(BlockDriverState
*bs
, int bdrv_flags
, Error
**errp
);
223 int bdrv_reopen_prepare(BDRVReopenState
*reopen_state
,
224 BlockReopenQueue
*queue
, Error
**errp
);
225 void bdrv_reopen_commit(BDRVReopenState
*reopen_state
);
226 void bdrv_reopen_abort(BDRVReopenState
*reopen_state
);
227 void bdrv_close(BlockDriverState
*bs
);
228 void bdrv_add_close_notifier(BlockDriverState
*bs
, Notifier
*notify
);
229 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
230 uint8_t *buf
, int nb_sectors
);
231 int bdrv_read_unthrottled(BlockDriverState
*bs
, int64_t sector_num
,
232 uint8_t *buf
, int nb_sectors
);
233 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
234 const uint8_t *buf
, int nb_sectors
);
235 int bdrv_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
236 int nb_sectors
, BdrvRequestFlags flags
);
237 BlockAIOCB
*bdrv_aio_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
238 int nb_sectors
, BdrvRequestFlags flags
,
239 BlockCompletionFunc
*cb
, void *opaque
);
240 int bdrv_make_zero(BlockDriverState
*bs
, BdrvRequestFlags flags
);
241 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
242 void *buf
, int count
);
243 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
244 const void *buf
, int count
);
245 int bdrv_pwritev(BlockDriverState
*bs
, int64_t offset
, QEMUIOVector
*qiov
);
246 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
247 const void *buf
, int count
);
248 int coroutine_fn
bdrv_co_readv(BlockDriverState
*bs
, int64_t sector_num
,
249 int nb_sectors
, QEMUIOVector
*qiov
);
250 int coroutine_fn
bdrv_co_copy_on_readv(BlockDriverState
*bs
,
251 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
252 int coroutine_fn
bdrv_co_readv_no_serialising(BlockDriverState
*bs
,
253 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
254 int coroutine_fn
bdrv_co_writev(BlockDriverState
*bs
, int64_t sector_num
,
255 int nb_sectors
, QEMUIOVector
*qiov
);
257 * Efficiently zero a region of the disk image. Note that this is a regular
258 * I/O request like read or write and should have a reasonable size. This
259 * function is not suitable for zeroing the entire image in a single request
260 * because it may allocate memory for the entire region.
262 int coroutine_fn
bdrv_co_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
263 int nb_sectors
, BdrvRequestFlags flags
);
264 BlockDriverState
*bdrv_find_backing_image(BlockDriverState
*bs
,
265 const char *backing_file
);
266 int bdrv_get_backing_file_depth(BlockDriverState
*bs
);
267 void bdrv_refresh_filename(BlockDriverState
*bs
);
268 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
);
269 int64_t bdrv_nb_sectors(BlockDriverState
*bs
);
270 int64_t bdrv_getlength(BlockDriverState
*bs
);
271 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
);
272 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
);
273 void bdrv_refresh_limits(BlockDriverState
*bs
, Error
**errp
);
274 int bdrv_commit(BlockDriverState
*bs
);
275 int bdrv_commit_all(void);
276 int bdrv_change_backing_file(BlockDriverState
*bs
,
277 const char *backing_file
, const char *backing_fmt
);
278 void bdrv_register(BlockDriver
*bdrv
);
279 int bdrv_drop_intermediate(BlockDriverState
*active
, BlockDriverState
*top
,
280 BlockDriverState
*base
,
281 const char *backing_file_str
);
282 BlockDriverState
*bdrv_find_overlay(BlockDriverState
*active
,
283 BlockDriverState
*bs
);
284 BlockDriverState
*bdrv_find_base(BlockDriverState
*bs
);
287 typedef struct BdrvCheckResult
{
291 int corruptions_fixed
;
293 int64_t image_end_offset
;
302 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
, BdrvCheckMode fix
);
304 /* The units of offset and total_work_size may be chosen arbitrarily by the
305 * block driver; total_work_size may change during the course of the amendment
307 typedef void BlockDriverAmendStatusCB(BlockDriverState
*bs
, int64_t offset
,
308 int64_t total_work_size
, void *opaque
);
309 int bdrv_amend_options(BlockDriverState
*bs_new
, QemuOpts
*opts
,
310 BlockDriverAmendStatusCB
*status_cb
, void *cb_opaque
);
312 /* external snapshots */
313 bool bdrv_recurse_is_first_non_filter(BlockDriverState
*bs
,
314 BlockDriverState
*candidate
);
315 bool bdrv_is_first_non_filter(BlockDriverState
*candidate
);
317 /* check if a named node can be replaced when doing drive-mirror */
318 BlockDriverState
*check_to_replace_node(BlockDriverState
*parent_bs
,
319 const char *node_name
, Error
**errp
);
321 /* async block I/O */
322 typedef void BlockDriverDirtyHandler(BlockDriverState
*bs
, int64_t sector
,
324 BlockAIOCB
*bdrv_aio_readv(BlockDriverState
*bs
, int64_t sector_num
,
325 QEMUIOVector
*iov
, int nb_sectors
,
326 BlockCompletionFunc
*cb
, void *opaque
);
327 BlockAIOCB
*bdrv_aio_writev(BlockDriverState
*bs
, int64_t sector_num
,
328 QEMUIOVector
*iov
, int nb_sectors
,
329 BlockCompletionFunc
*cb
, void *opaque
);
330 BlockAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
331 BlockCompletionFunc
*cb
, void *opaque
);
332 BlockAIOCB
*bdrv_aio_discard(BlockDriverState
*bs
,
333 int64_t sector_num
, int nb_sectors
,
334 BlockCompletionFunc
*cb
, void *opaque
);
335 void bdrv_aio_cancel(BlockAIOCB
*acb
);
336 void bdrv_aio_cancel_async(BlockAIOCB
*acb
);
338 typedef struct BlockRequest
{
339 /* Fields to be filled by multiwrite caller */
352 BlockCompletionFunc
*cb
;
355 /* Filled by multiwrite implementation */
359 int bdrv_aio_multiwrite(BlockDriverState
*bs
, BlockRequest
*reqs
,
362 /* sg packet commands */
363 int bdrv_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
);
364 BlockAIOCB
*bdrv_aio_ioctl(BlockDriverState
*bs
,
365 unsigned long int req
, void *buf
,
366 BlockCompletionFunc
*cb
, void *opaque
);
368 /* Invalidate any cached metadata used by image formats */
369 void bdrv_invalidate_cache(BlockDriverState
*bs
, Error
**errp
);
370 void bdrv_invalidate_cache_all(Error
**errp
);
372 /* Ensure contents are flushed to disk. */
373 int bdrv_flush(BlockDriverState
*bs
);
374 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
);
375 int bdrv_flush_all(void);
376 void bdrv_close_all(void);
377 void bdrv_drain(BlockDriverState
*bs
);
378 void bdrv_drain_all(void);
380 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
381 int bdrv_co_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
382 int bdrv_has_zero_init_1(BlockDriverState
*bs
);
383 int bdrv_has_zero_init(BlockDriverState
*bs
);
384 bool bdrv_unallocated_blocks_are_zero(BlockDriverState
*bs
);
385 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState
*bs
);
386 int64_t bdrv_get_block_status(BlockDriverState
*bs
, int64_t sector_num
,
387 int nb_sectors
, int *pnum
);
388 int64_t bdrv_get_block_status_above(BlockDriverState
*bs
,
389 BlockDriverState
*base
,
391 int nb_sectors
, int *pnum
);
392 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
394 int bdrv_is_allocated_above(BlockDriverState
*top
, BlockDriverState
*base
,
395 int64_t sector_num
, int nb_sectors
, int *pnum
);
397 int bdrv_is_read_only(BlockDriverState
*bs
);
398 int bdrv_is_sg(BlockDriverState
*bs
);
399 int bdrv_enable_write_cache(BlockDriverState
*bs
);
400 void bdrv_set_enable_write_cache(BlockDriverState
*bs
, bool wce
);
401 bool bdrv_is_inserted(BlockDriverState
*bs
);
402 int bdrv_media_changed(BlockDriverState
*bs
);
403 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
);
404 void bdrv_eject(BlockDriverState
*bs
, bool eject_flag
);
405 const char *bdrv_get_format_name(BlockDriverState
*bs
);
406 BlockDriverState
*bdrv_find_node(const char *node_name
);
407 BlockDeviceInfoList
*bdrv_named_nodes_list(Error
**errp
);
408 BlockDriverState
*bdrv_lookup_bs(const char *device
,
409 const char *node_name
,
411 bool bdrv_chain_contains(BlockDriverState
*top
, BlockDriverState
*base
);
412 BlockDriverState
*bdrv_next_node(BlockDriverState
*bs
);
413 BlockDriverState
*bdrv_next(BlockDriverState
*bs
);
414 int bdrv_is_encrypted(BlockDriverState
*bs
);
415 int bdrv_key_required(BlockDriverState
*bs
);
416 int bdrv_set_key(BlockDriverState
*bs
, const char *key
);
417 void bdrv_add_key(BlockDriverState
*bs
, const char *key
, Error
**errp
);
418 int bdrv_query_missing_keys(void);
419 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
421 const char *bdrv_get_node_name(const BlockDriverState
*bs
);
422 const char *bdrv_get_device_name(const BlockDriverState
*bs
);
423 const char *bdrv_get_device_or_node_name(const BlockDriverState
*bs
);
424 int bdrv_get_flags(BlockDriverState
*bs
);
425 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
426 const uint8_t *buf
, int nb_sectors
);
427 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
428 ImageInfoSpecific
*bdrv_get_specific_info(BlockDriverState
*bs
);
429 void bdrv_round_to_clusters(BlockDriverState
*bs
,
430 int64_t sector_num
, int nb_sectors
,
431 int64_t *cluster_sector_num
,
432 int *cluster_nb_sectors
);
434 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
);
435 void bdrv_get_backing_filename(BlockDriverState
*bs
,
436 char *filename
, int filename_size
);
437 void bdrv_get_full_backing_filename(BlockDriverState
*bs
,
438 char *dest
, size_t sz
, Error
**errp
);
439 void bdrv_get_full_backing_filename_from_filename(const char *backed
,
441 char *dest
, size_t sz
,
443 int bdrv_is_snapshot(BlockDriverState
*bs
);
445 int path_has_protocol(const char *path
);
446 int path_is_absolute(const char *path
);
447 void path_combine(char *dest
, int dest_size
,
448 const char *base_path
,
449 const char *filename
);
451 int bdrv_writev_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
452 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
453 int64_t pos
, int size
);
455 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
456 int64_t pos
, int size
);
458 void bdrv_img_create(const char *filename
, const char *fmt
,
459 const char *base_filename
, const char *base_fmt
,
460 char *options
, uint64_t img_size
, int flags
,
461 Error
**errp
, bool quiet
);
463 /* Returns the alignment in bytes that is required so that no bounce buffer
464 * is required throughout the stack */
465 size_t bdrv_min_mem_align(BlockDriverState
*bs
);
466 /* Returns optimal alignment in bytes for bounce buffer */
467 size_t bdrv_opt_mem_align(BlockDriverState
*bs
);
468 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
);
469 void *qemu_blockalign0(BlockDriverState
*bs
, size_t size
);
470 void *qemu_try_blockalign(BlockDriverState
*bs
, size_t size
);
471 void *qemu_try_blockalign0(BlockDriverState
*bs
, size_t size
);
472 bool bdrv_qiov_is_aligned(BlockDriverState
*bs
, QEMUIOVector
*qiov
);
475 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap
;
476 BdrvDirtyBitmap
*bdrv_create_dirty_bitmap(BlockDriverState
*bs
,
477 uint32_t granularity
,
480 int bdrv_dirty_bitmap_create_successor(BlockDriverState
*bs
,
481 BdrvDirtyBitmap
*bitmap
,
483 BdrvDirtyBitmap
*bdrv_dirty_bitmap_abdicate(BlockDriverState
*bs
,
484 BdrvDirtyBitmap
*bitmap
,
486 BdrvDirtyBitmap
*bdrv_reclaim_dirty_bitmap(BlockDriverState
*bs
,
487 BdrvDirtyBitmap
*bitmap
,
489 BdrvDirtyBitmap
*bdrv_find_dirty_bitmap(BlockDriverState
*bs
,
491 void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap
*bitmap
);
492 void bdrv_release_dirty_bitmap(BlockDriverState
*bs
, BdrvDirtyBitmap
*bitmap
);
493 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap
*bitmap
);
494 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap
*bitmap
);
495 BlockDirtyInfoList
*bdrv_query_dirty_bitmaps(BlockDriverState
*bs
);
496 uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState
*bs
);
497 uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap
*bitmap
);
498 bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap
*bitmap
);
499 bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap
*bitmap
);
500 DirtyBitmapStatus
bdrv_dirty_bitmap_status(BdrvDirtyBitmap
*bitmap
);
501 int bdrv_get_dirty(BlockDriverState
*bs
, BdrvDirtyBitmap
*bitmap
, int64_t sector
);
502 void bdrv_set_dirty_bitmap(BdrvDirtyBitmap
*bitmap
,
503 int64_t cur_sector
, int nr_sectors
);
504 void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap
*bitmap
,
505 int64_t cur_sector
, int nr_sectors
);
506 void bdrv_dirty_iter_init(BdrvDirtyBitmap
*bitmap
, struct HBitmapIter
*hbi
);
507 void bdrv_set_dirty_iter(struct HBitmapIter
*hbi
, int64_t offset
);
508 int64_t bdrv_get_dirty_count(BdrvDirtyBitmap
*bitmap
);
510 void bdrv_enable_copy_on_read(BlockDriverState
*bs
);
511 void bdrv_disable_copy_on_read(BlockDriverState
*bs
);
513 void bdrv_ref(BlockDriverState
*bs
);
514 void bdrv_unref(BlockDriverState
*bs
);
515 void bdrv_unref_child(BlockDriverState
*parent
, BdrvChild
*child
);
517 bool bdrv_op_is_blocked(BlockDriverState
*bs
, BlockOpType op
, Error
**errp
);
518 void bdrv_op_block(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
519 void bdrv_op_unblock(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
520 void bdrv_op_block_all(BlockDriverState
*bs
, Error
*reason
);
521 void bdrv_op_unblock_all(BlockDriverState
*bs
, Error
*reason
);
522 bool bdrv_op_blocker_is_empty(BlockDriverState
*bs
);
524 #define BLKDBG_EVENT(child, evt) \
527 bdrv_debug_event(child->bs, evt); \
531 void bdrv_debug_event(BlockDriverState
*bs
, BlkdebugEvent event
);
533 int bdrv_debug_breakpoint(BlockDriverState
*bs
, const char *event
,
535 int bdrv_debug_remove_breakpoint(BlockDriverState
*bs
, const char *tag
);
536 int bdrv_debug_resume(BlockDriverState
*bs
, const char *tag
);
537 bool bdrv_debug_is_suspended(BlockDriverState
*bs
, const char *tag
);
540 * bdrv_get_aio_context:
542 * Returns: the currently bound #AioContext
544 AioContext
*bdrv_get_aio_context(BlockDriverState
*bs
);
547 * bdrv_set_aio_context:
549 * Changes the #AioContext used for fd handlers, timers, and BHs by this
550 * BlockDriverState and all its children.
552 * This function must be called with iothread lock held.
554 void bdrv_set_aio_context(BlockDriverState
*bs
, AioContext
*new_context
);
555 int bdrv_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
);
556 int bdrv_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
);
558 void bdrv_io_plug(BlockDriverState
*bs
);
559 void bdrv_io_unplug(BlockDriverState
*bs
);
560 void bdrv_flush_io_queue(BlockDriverState
*bs
);
563 * bdrv_drained_begin:
565 * Begin a quiesced section for exclusive access to the BDS, by disabling
566 * external request sources including NBD server and device model. Note that
567 * this doesn't block timers or coroutines from submitting more requests, which
568 * means block_job_pause is still necessary.
570 * This function can be recursive.
572 void bdrv_drained_begin(BlockDriverState
*bs
);
577 * End a quiescent section started by bdrv_drained_begin().
579 void bdrv_drained_end(BlockDriverState
*bs
);