6 #include "qemu/option.h"
7 #include "qemu/coroutine.h"
8 #include "block/accounting.h"
9 #include "block/dirty-bitmap.h"
10 #include "qapi/qmp/qobject.h"
11 #include "qapi-types.h"
12 #include "qemu/hbitmap.h"
15 typedef struct BlockDriver BlockDriver
;
16 typedef struct BlockJob BlockJob
;
17 typedef struct BdrvChild BdrvChild
;
18 typedef struct BdrvChildRole BdrvChildRole
;
19 typedef struct BlockJobTxn BlockJobTxn
;
20 typedef struct BdrvNextIterator BdrvNextIterator
;
22 typedef struct BlockDriverInfo
{
23 /* in bytes, 0 if irrelevant */
25 /* offset at which the VM state can be saved (0 if not possible) */
26 int64_t vm_state_offset
;
29 * True if unallocated blocks read back as zeroes. This is equivalent
30 * to the LBPRZ flag in the SCSI logical block provisioning page.
32 bool unallocated_blocks_are_zero
;
34 * True if the driver can optimize writing zeroes by unmapping
35 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
36 * with the difference that in qemu a discard is allowed to silently
37 * fail. Therefore we have to use bdrv_write_zeroes with the
38 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
39 * After this call the driver has to guarantee that the contents read
40 * back as zero. It is additionally required that the block device is
41 * opened with BDRV_O_UNMAP flag for this to work.
43 bool can_write_zeroes_with_unmap
;
45 * True if this block driver only supports compressed writes
47 bool needs_compressed_writes
;
50 typedef struct BlockFragInfo
{
51 uint64_t allocated_clusters
;
52 uint64_t total_clusters
;
53 uint64_t fragmented_clusters
;
54 uint64_t compressed_clusters
;
58 BDRV_REQ_COPY_ON_READ
= 0x1,
59 BDRV_REQ_ZERO_WRITE
= 0x2,
60 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
61 * is allowed to optimize a write zeroes request by unmapping (discarding)
62 * blocks if it is guaranteed that the result will read back as
63 * zeroes. The flag is only passed to the driver if the block device is
64 * opened with BDRV_O_UNMAP.
66 BDRV_REQ_MAY_UNMAP
= 0x4,
67 BDRV_REQ_NO_SERIALISING
= 0x8,
71 typedef struct BlockSizes
{
76 typedef struct HDGeometry
{
82 #define BDRV_O_RDWR 0x0002
83 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
84 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
85 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
86 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
87 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
88 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
89 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
90 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */
91 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
92 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
93 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
94 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
95 select an appropriate protocol driver,
96 ignoring the format layer */
97 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
99 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
102 /* Option names of options parsed by the block layer */
104 #define BDRV_OPT_CACHE_WB "cache.writeback"
105 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
106 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
109 #define BDRV_SECTOR_BITS 9
110 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
111 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
113 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
114 INT_MAX >> BDRV_SECTOR_BITS)
117 * Allocation status flags
118 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status.
119 * BDRV_BLOCK_ZERO: sectors read as zero
120 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by
121 * bdrv_get_block_status.
122 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
123 * layer (as opposed to the backing file)
124 * BDRV_BLOCK_RAW: used internally to indicate that the request
125 * was answered by the raw driver and that one
126 * should look in bs->file directly.
128 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
129 * bs->file where sector data can be read from as raw data.
131 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
133 * DATA ZERO OFFSET_VALID
134 * t t t sectors read as zero, bs->file is zero at offset
135 * t f t sectors read as valid from bs->file at offset
136 * f t t sectors preallocated, read as zero, bs->file not
137 * necessarily zero at offset
138 * f f t sectors preallocated but read from backing_hd,
139 * bs->file contains garbage at offset
140 * t t f sectors preallocated, read as zero, unknown offset
141 * t f f sectors read from unknown file or offset
142 * f t f not allocated or unknown offset, read as zero
143 * f f f not allocated or unknown offset, read from backing_hd
145 #define BDRV_BLOCK_DATA 0x01
146 #define BDRV_BLOCK_ZERO 0x02
147 #define BDRV_BLOCK_OFFSET_VALID 0x04
148 #define BDRV_BLOCK_RAW 0x08
149 #define BDRV_BLOCK_ALLOCATED 0x10
150 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
152 typedef QSIMPLEQ_HEAD(BlockReopenQueue
, BlockReopenQueueEntry
) BlockReopenQueue
;
154 typedef struct BDRVReopenState
{
155 BlockDriverState
*bs
;
158 QDict
*explicit_options
;
163 * Block operation types
165 typedef enum BlockOpType
{
166 BLOCK_OP_TYPE_BACKUP_SOURCE
,
167 BLOCK_OP_TYPE_BACKUP_TARGET
,
168 BLOCK_OP_TYPE_CHANGE
,
169 BLOCK_OP_TYPE_COMMIT_SOURCE
,
170 BLOCK_OP_TYPE_COMMIT_TARGET
,
171 BLOCK_OP_TYPE_DATAPLANE
,
172 BLOCK_OP_TYPE_DRIVE_DEL
,
174 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
175 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
,
176 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
,
177 BLOCK_OP_TYPE_MIRROR_SOURCE
,
178 BLOCK_OP_TYPE_MIRROR_TARGET
,
179 BLOCK_OP_TYPE_RESIZE
,
180 BLOCK_OP_TYPE_STREAM
,
181 BLOCK_OP_TYPE_REPLACE
,
185 void bdrv_info_print(Monitor
*mon
, const QObject
*data
);
186 void bdrv_info(Monitor
*mon
, QObject
**ret_data
);
187 void bdrv_stats_print(Monitor
*mon
, const QObject
*data
);
188 void bdrv_info_stats(Monitor
*mon
, QObject
**ret_data
);
190 /* disk I/O throttling */
191 void bdrv_init(void);
192 void bdrv_init_with_whitelist(void);
193 bool bdrv_uses_whitelist(void);
194 BlockDriver
*bdrv_find_protocol(const char *filename
,
195 bool allow_protocol_prefix
,
197 BlockDriver
*bdrv_find_format(const char *format_name
);
198 int bdrv_create(BlockDriver
*drv
, const char* filename
,
199 QemuOpts
*opts
, Error
**errp
);
200 int bdrv_create_file(const char *filename
, QemuOpts
*opts
, Error
**errp
);
201 BlockDriverState
*bdrv_new_root(void);
202 BlockDriverState
*bdrv_new(void);
203 void bdrv_append(BlockDriverState
*bs_new
, BlockDriverState
*bs_top
);
204 void bdrv_replace_in_backing_chain(BlockDriverState
*old
,
205 BlockDriverState
*new);
207 int bdrv_parse_cache_mode(const char *mode
, int *flags
, bool *writethrough
);
208 int bdrv_parse_discard_flags(const char *mode
, int *flags
);
209 BdrvChild
*bdrv_open_child(const char *filename
,
210 QDict
*options
, const char *bdref_key
,
211 BlockDriverState
* parent
,
212 const BdrvChildRole
*child_role
,
213 bool allow_none
, Error
**errp
);
214 void bdrv_set_backing_hd(BlockDriverState
*bs
, BlockDriverState
*backing_hd
);
215 int bdrv_open_backing_file(BlockDriverState
*bs
, QDict
*parent_options
,
216 const char *bdref_key
, Error
**errp
);
217 int bdrv_open(BlockDriverState
**pbs
, const char *filename
,
218 const char *reference
, QDict
*options
, int flags
, Error
**errp
);
219 BlockReopenQueue
*bdrv_reopen_queue(BlockReopenQueue
*bs_queue
,
220 BlockDriverState
*bs
,
221 QDict
*options
, int flags
);
222 int bdrv_reopen_multiple(BlockReopenQueue
*bs_queue
, Error
**errp
);
223 int bdrv_reopen(BlockDriverState
*bs
, int bdrv_flags
, Error
**errp
);
224 int bdrv_reopen_prepare(BDRVReopenState
*reopen_state
,
225 BlockReopenQueue
*queue
, Error
**errp
);
226 void bdrv_reopen_commit(BDRVReopenState
*reopen_state
);
227 void bdrv_reopen_abort(BDRVReopenState
*reopen_state
);
228 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
229 uint8_t *buf
, int nb_sectors
);
230 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
231 const uint8_t *buf
, int nb_sectors
);
232 int bdrv_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
233 int nb_sectors
, BdrvRequestFlags flags
);
234 BlockAIOCB
*bdrv_aio_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
235 int nb_sectors
, BdrvRequestFlags flags
,
236 BlockCompletionFunc
*cb
, void *opaque
);
237 int bdrv_make_zero(BlockDriverState
*bs
, BdrvRequestFlags flags
);
238 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
239 void *buf
, int count
);
240 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
241 const void *buf
, int count
);
242 int bdrv_pwritev(BlockDriverState
*bs
, int64_t offset
, QEMUIOVector
*qiov
);
243 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
244 const void *buf
, int count
);
245 int coroutine_fn
bdrv_co_readv(BlockDriverState
*bs
, int64_t sector_num
,
246 int nb_sectors
, QEMUIOVector
*qiov
);
247 int coroutine_fn
bdrv_co_copy_on_readv(BlockDriverState
*bs
,
248 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
249 int coroutine_fn
bdrv_co_readv_no_serialising(BlockDriverState
*bs
,
250 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
251 int coroutine_fn
bdrv_co_writev(BlockDriverState
*bs
, int64_t sector_num
,
252 int nb_sectors
, QEMUIOVector
*qiov
);
254 * Efficiently zero a region of the disk image. Note that this is a regular
255 * I/O request like read or write and should have a reasonable size. This
256 * function is not suitable for zeroing the entire image in a single request
257 * because it may allocate memory for the entire region.
259 int coroutine_fn
bdrv_co_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
260 int nb_sectors
, BdrvRequestFlags flags
);
261 BlockDriverState
*bdrv_find_backing_image(BlockDriverState
*bs
,
262 const char *backing_file
);
263 int bdrv_get_backing_file_depth(BlockDriverState
*bs
);
264 void bdrv_refresh_filename(BlockDriverState
*bs
);
265 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
);
266 int64_t bdrv_nb_sectors(BlockDriverState
*bs
);
267 int64_t bdrv_getlength(BlockDriverState
*bs
);
268 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
);
269 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
);
270 void bdrv_refresh_limits(BlockDriverState
*bs
, Error
**errp
);
271 int bdrv_commit(BlockDriverState
*bs
);
272 int bdrv_change_backing_file(BlockDriverState
*bs
,
273 const char *backing_file
, const char *backing_fmt
);
274 void bdrv_register(BlockDriver
*bdrv
);
275 int bdrv_drop_intermediate(BlockDriverState
*active
, BlockDriverState
*top
,
276 BlockDriverState
*base
,
277 const char *backing_file_str
);
278 BlockDriverState
*bdrv_find_overlay(BlockDriverState
*active
,
279 BlockDriverState
*bs
);
280 BlockDriverState
*bdrv_find_base(BlockDriverState
*bs
);
283 typedef struct BdrvCheckResult
{
287 int corruptions_fixed
;
289 int64_t image_end_offset
;
298 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
, BdrvCheckMode fix
);
300 /* The units of offset and total_work_size may be chosen arbitrarily by the
301 * block driver; total_work_size may change during the course of the amendment
303 typedef void BlockDriverAmendStatusCB(BlockDriverState
*bs
, int64_t offset
,
304 int64_t total_work_size
, void *opaque
);
305 int bdrv_amend_options(BlockDriverState
*bs_new
, QemuOpts
*opts
,
306 BlockDriverAmendStatusCB
*status_cb
, void *cb_opaque
);
308 /* external snapshots */
309 bool bdrv_recurse_is_first_non_filter(BlockDriverState
*bs
,
310 BlockDriverState
*candidate
);
311 bool bdrv_is_first_non_filter(BlockDriverState
*candidate
);
313 /* check if a named node can be replaced when doing drive-mirror */
314 BlockDriverState
*check_to_replace_node(BlockDriverState
*parent_bs
,
315 const char *node_name
, Error
**errp
);
317 /* async block I/O */
318 BlockAIOCB
*bdrv_aio_readv(BlockDriverState
*bs
, int64_t sector_num
,
319 QEMUIOVector
*iov
, int nb_sectors
,
320 BlockCompletionFunc
*cb
, void *opaque
);
321 BlockAIOCB
*bdrv_aio_writev(BlockDriverState
*bs
, int64_t sector_num
,
322 QEMUIOVector
*iov
, int nb_sectors
,
323 BlockCompletionFunc
*cb
, void *opaque
);
324 BlockAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
325 BlockCompletionFunc
*cb
, void *opaque
);
326 BlockAIOCB
*bdrv_aio_discard(BlockDriverState
*bs
,
327 int64_t sector_num
, int nb_sectors
,
328 BlockCompletionFunc
*cb
, void *opaque
);
329 void bdrv_aio_cancel(BlockAIOCB
*acb
);
330 void bdrv_aio_cancel_async(BlockAIOCB
*acb
);
332 typedef struct BlockRequest
{
333 /* Fields to be filled by caller */
346 BlockCompletionFunc
*cb
;
349 /* Filled by block layer */
353 /* sg packet commands */
354 int bdrv_ioctl(BlockDriverState
*bs
, unsigned long int req
, void *buf
);
355 BlockAIOCB
*bdrv_aio_ioctl(BlockDriverState
*bs
,
356 unsigned long int req
, void *buf
,
357 BlockCompletionFunc
*cb
, void *opaque
);
359 /* Invalidate any cached metadata used by image formats */
360 void bdrv_invalidate_cache(BlockDriverState
*bs
, Error
**errp
);
361 void bdrv_invalidate_cache_all(Error
**errp
);
362 int bdrv_inactivate_all(void);
364 /* Ensure contents are flushed to disk. */
365 int bdrv_flush(BlockDriverState
*bs
);
366 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
);
367 void bdrv_close_all(void);
368 void bdrv_drain(BlockDriverState
*bs
);
369 void coroutine_fn
bdrv_co_drain(BlockDriverState
*bs
);
370 void bdrv_drain_all(void);
372 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
373 int bdrv_co_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
374 int bdrv_has_zero_init_1(BlockDriverState
*bs
);
375 int bdrv_has_zero_init(BlockDriverState
*bs
);
376 bool bdrv_unallocated_blocks_are_zero(BlockDriverState
*bs
);
377 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState
*bs
);
378 int64_t bdrv_get_block_status(BlockDriverState
*bs
, int64_t sector_num
,
379 int nb_sectors
, int *pnum
,
380 BlockDriverState
**file
);
381 int64_t bdrv_get_block_status_above(BlockDriverState
*bs
,
382 BlockDriverState
*base
,
384 int nb_sectors
, int *pnum
,
385 BlockDriverState
**file
);
386 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
388 int bdrv_is_allocated_above(BlockDriverState
*top
, BlockDriverState
*base
,
389 int64_t sector_num
, int nb_sectors
, int *pnum
);
391 int bdrv_is_read_only(BlockDriverState
*bs
);
392 int bdrv_is_sg(BlockDriverState
*bs
);
393 bool bdrv_is_inserted(BlockDriverState
*bs
);
394 int bdrv_media_changed(BlockDriverState
*bs
);
395 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
);
396 void bdrv_eject(BlockDriverState
*bs
, bool eject_flag
);
397 const char *bdrv_get_format_name(BlockDriverState
*bs
);
398 BlockDriverState
*bdrv_find_node(const char *node_name
);
399 BlockDeviceInfoList
*bdrv_named_nodes_list(Error
**errp
);
400 BlockDriverState
*bdrv_lookup_bs(const char *device
,
401 const char *node_name
,
403 bool bdrv_chain_contains(BlockDriverState
*top
, BlockDriverState
*base
);
404 BlockDriverState
*bdrv_next_node(BlockDriverState
*bs
);
405 BdrvNextIterator
*bdrv_next(BdrvNextIterator
*it
, BlockDriverState
**bs
);
406 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
);
407 int bdrv_is_encrypted(BlockDriverState
*bs
);
408 int bdrv_key_required(BlockDriverState
*bs
);
409 int bdrv_set_key(BlockDriverState
*bs
, const char *key
);
410 void bdrv_add_key(BlockDriverState
*bs
, const char *key
, Error
**errp
);
411 int bdrv_query_missing_keys(void);
412 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
414 const char *bdrv_get_node_name(const BlockDriverState
*bs
);
415 const char *bdrv_get_device_name(const BlockDriverState
*bs
);
416 const char *bdrv_get_device_or_node_name(const BlockDriverState
*bs
);
417 int bdrv_get_flags(BlockDriverState
*bs
);
418 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
419 const uint8_t *buf
, int nb_sectors
);
420 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
421 ImageInfoSpecific
*bdrv_get_specific_info(BlockDriverState
*bs
);
422 void bdrv_round_to_clusters(BlockDriverState
*bs
,
423 int64_t sector_num
, int nb_sectors
,
424 int64_t *cluster_sector_num
,
425 int *cluster_nb_sectors
);
427 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
);
428 void bdrv_get_backing_filename(BlockDriverState
*bs
,
429 char *filename
, int filename_size
);
430 void bdrv_get_full_backing_filename(BlockDriverState
*bs
,
431 char *dest
, size_t sz
, Error
**errp
);
432 void bdrv_get_full_backing_filename_from_filename(const char *backed
,
434 char *dest
, size_t sz
,
436 int bdrv_is_snapshot(BlockDriverState
*bs
);
438 int path_has_protocol(const char *path
);
439 int path_is_absolute(const char *path
);
440 void path_combine(char *dest
, int dest_size
,
441 const char *base_path
,
442 const char *filename
);
444 int bdrv_writev_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
445 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
446 int64_t pos
, int size
);
448 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
449 int64_t pos
, int size
);
451 void bdrv_img_create(const char *filename
, const char *fmt
,
452 const char *base_filename
, const char *base_fmt
,
453 char *options
, uint64_t img_size
, int flags
,
454 Error
**errp
, bool quiet
);
456 /* Returns the alignment in bytes that is required so that no bounce buffer
457 * is required throughout the stack */
458 size_t bdrv_min_mem_align(BlockDriverState
*bs
);
459 /* Returns optimal alignment in bytes for bounce buffer */
460 size_t bdrv_opt_mem_align(BlockDriverState
*bs
);
461 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
);
462 void *qemu_blockalign0(BlockDriverState
*bs
, size_t size
);
463 void *qemu_try_blockalign(BlockDriverState
*bs
, size_t size
);
464 void *qemu_try_blockalign0(BlockDriverState
*bs
, size_t size
);
465 bool bdrv_qiov_is_aligned(BlockDriverState
*bs
, QEMUIOVector
*qiov
);
467 void bdrv_enable_copy_on_read(BlockDriverState
*bs
);
468 void bdrv_disable_copy_on_read(BlockDriverState
*bs
);
470 void bdrv_ref(BlockDriverState
*bs
);
471 void bdrv_unref(BlockDriverState
*bs
);
472 void bdrv_unref_child(BlockDriverState
*parent
, BdrvChild
*child
);
473 BdrvChild
*bdrv_attach_child(BlockDriverState
*parent_bs
,
474 BlockDriverState
*child_bs
,
475 const char *child_name
,
476 const BdrvChildRole
*child_role
);
478 bool bdrv_op_is_blocked(BlockDriverState
*bs
, BlockOpType op
, Error
**errp
);
479 void bdrv_op_block(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
480 void bdrv_op_unblock(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
481 void bdrv_op_block_all(BlockDriverState
*bs
, Error
*reason
);
482 void bdrv_op_unblock_all(BlockDriverState
*bs
, Error
*reason
);
483 bool bdrv_op_blocker_is_empty(BlockDriverState
*bs
);
485 #define BLKDBG_EVENT(child, evt) \
488 bdrv_debug_event(child->bs, evt); \
492 void bdrv_debug_event(BlockDriverState
*bs
, BlkdebugEvent event
);
494 int bdrv_debug_breakpoint(BlockDriverState
*bs
, const char *event
,
496 int bdrv_debug_remove_breakpoint(BlockDriverState
*bs
, const char *tag
);
497 int bdrv_debug_resume(BlockDriverState
*bs
, const char *tag
);
498 bool bdrv_debug_is_suspended(BlockDriverState
*bs
, const char *tag
);
501 * bdrv_get_aio_context:
503 * Returns: the currently bound #AioContext
505 AioContext
*bdrv_get_aio_context(BlockDriverState
*bs
);
508 * bdrv_set_aio_context:
510 * Changes the #AioContext used for fd handlers, timers, and BHs by this
511 * BlockDriverState and all its children.
513 * This function must be called with iothread lock held.
515 void bdrv_set_aio_context(BlockDriverState
*bs
, AioContext
*new_context
);
516 int bdrv_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
);
517 int bdrv_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
);
519 void bdrv_io_plug(BlockDriverState
*bs
);
520 void bdrv_io_unplug(BlockDriverState
*bs
);
521 void bdrv_io_unplugged_begin(BlockDriverState
*bs
);
522 void bdrv_io_unplugged_end(BlockDriverState
*bs
);
525 * bdrv_drained_begin:
527 * Begin a quiesced section for exclusive access to the BDS, by disabling
528 * external request sources including NBD server and device model. Note that
529 * this doesn't block timers or coroutines from submitting more requests, which
530 * means block_job_pause is still necessary.
532 * This function can be recursive.
534 void bdrv_drained_begin(BlockDriverState
*bs
);
539 * End a quiescent section started by bdrv_drained_begin().
541 void bdrv_drained_end(BlockDriverState
*bs
);
543 void bdrv_add_child(BlockDriverState
*parent
, BlockDriverState
*child
,
545 void bdrv_del_child(BlockDriverState
*parent
, BdrvChild
*child
, Error
**errp
);