5 #include "qemu-common.h"
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
;
21 typedef struct BlockDriverInfo
{
22 /* in bytes, 0 if irrelevant */
24 /* offset at which the VM state can be saved (0 if not possible) */
25 int64_t vm_state_offset
;
28 * True if unallocated blocks read back as zeroes. This is equivalent
29 * to the LBPRZ flag in the SCSI logical block provisioning page.
31 bool unallocated_blocks_are_zero
;
33 * True if the driver can optimize writing zeroes by unmapping
34 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
35 * with the difference that in qemu a discard is allowed to silently
36 * fail. Therefore we have to use bdrv_write_zeroes with the
37 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
38 * After this call the driver has to guarantee that the contents read
39 * back as zero. It is additionally required that the block device is
40 * opened with BDRV_O_UNMAP flag for this to work.
42 bool can_write_zeroes_with_unmap
;
44 * True if this block driver only supports compressed writes
46 bool needs_compressed_writes
;
49 typedef struct BlockFragInfo
{
50 uint64_t allocated_clusters
;
51 uint64_t total_clusters
;
52 uint64_t fragmented_clusters
;
53 uint64_t compressed_clusters
;
57 BDRV_REQ_COPY_ON_READ
= 0x1,
58 BDRV_REQ_ZERO_WRITE
= 0x2,
59 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
60 * is allowed to optimize a write zeroes request by unmapping (discarding)
61 * blocks if it is guaranteed that the result will read back as
62 * zeroes. The flag is only passed to the driver if the block device is
63 * opened with BDRV_O_UNMAP.
65 BDRV_REQ_MAY_UNMAP
= 0x4,
66 BDRV_REQ_NO_SERIALISING
= 0x8,
69 typedef struct BlockSizes
{
74 typedef struct HDGeometry
{
80 #define BDRV_O_RDWR 0x0002
81 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
82 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
83 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
84 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
85 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
86 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
87 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
88 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
89 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */
90 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
91 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
92 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
93 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
94 select an appropriate protocol driver,
95 ignoring the format layer */
97 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH)
100 /* Option names of options parsed by the block layer */
102 #define BDRV_OPT_CACHE_WB "cache.writeback"
103 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
104 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
107 #define BDRV_SECTOR_BITS 9
108 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
109 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
111 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
112 INT_MAX >> BDRV_SECTOR_BITS)
115 * Allocation status flags
116 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status.
117 * BDRV_BLOCK_ZERO: sectors read as zero
118 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by
119 * bdrv_get_block_status.
120 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
121 * layer (as opposed to the backing file)
122 * BDRV_BLOCK_RAW: used internally to indicate that the request
123 * was answered by the raw driver and that one
124 * should look in bs->file directly.
126 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
127 * bs->file where sector data can be read from as raw data.
129 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
131 * DATA ZERO OFFSET_VALID
132 * t t t sectors read as zero, bs->file is zero at offset
133 * t f t sectors read as valid from bs->file at offset
134 * f t t sectors preallocated, read as zero, bs->file not
135 * necessarily zero at offset
136 * f f t sectors preallocated but read from backing_hd,
137 * bs->file contains garbage at offset
138 * t t f sectors preallocated, read as zero, unknown offset
139 * t f f sectors read from unknown file or offset
140 * f t f not allocated or unknown offset, read as zero
141 * f f f not allocated or unknown offset, read from backing_hd
143 #define BDRV_BLOCK_DATA 0x01
144 #define BDRV_BLOCK_ZERO 0x02
145 #define BDRV_BLOCK_OFFSET_VALID 0x04
146 #define BDRV_BLOCK_RAW 0x08
147 #define BDRV_BLOCK_ALLOCATED 0x10
148 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
150 typedef QSIMPLEQ_HEAD(BlockReopenQueue
, BlockReopenQueueEntry
) BlockReopenQueue
;
152 typedef struct BDRVReopenState
{
153 BlockDriverState
*bs
;
156 QDict
*explicit_options
;
161 * Block operation types
163 typedef enum BlockOpType
{
164 BLOCK_OP_TYPE_BACKUP_SOURCE
,
165 BLOCK_OP_TYPE_BACKUP_TARGET
,
166 BLOCK_OP_TYPE_CHANGE
,
167 BLOCK_OP_TYPE_COMMIT_SOURCE
,
168 BLOCK_OP_TYPE_COMMIT_TARGET
,
169 BLOCK_OP_TYPE_DATAPLANE
,
170 BLOCK_OP_TYPE_DRIVE_DEL
,
172 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
173 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
,
174 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
,
175 BLOCK_OP_TYPE_MIRROR_SOURCE
,
176 BLOCK_OP_TYPE_MIRROR_TARGET
,
177 BLOCK_OP_TYPE_RESIZE
,
178 BLOCK_OP_TYPE_STREAM
,
179 BLOCK_OP_TYPE_REPLACE
,
183 void bdrv_info_print(Monitor
*mon
, const QObject
*data
);
184 void bdrv_info(Monitor
*mon
, QObject
**ret_data
);
185 void bdrv_stats_print(Monitor
*mon
, const QObject
*data
);
186 void bdrv_info_stats(Monitor
*mon
, QObject
**ret_data
);
188 /* disk I/O throttling */
189 void bdrv_io_limits_enable(BlockDriverState
*bs
, const char *group
);
190 void bdrv_io_limits_disable(BlockDriverState
*bs
);
191 void bdrv_io_limits_update_group(BlockDriverState
*bs
, const char *group
);
193 void bdrv_init(void);
194 void bdrv_init_with_whitelist(void);
195 BlockDriver
*bdrv_find_protocol(const char *filename
,
196 bool allow_protocol_prefix
,
198 BlockDriver
*bdrv_find_format(const char *format_name
);
199 int bdrv_create(BlockDriver
*drv
, const char* filename
,
200 QemuOpts
*opts
, Error
**errp
);
201 int bdrv_create_file(const char *filename
, QemuOpts
*opts
, Error
**errp
);
202 BlockDriverState
*bdrv_new_root(void);
203 BlockDriverState
*bdrv_new(void);
204 void bdrv_device_remove(BlockDriverState
*bs
);
205 void bdrv_make_anon(BlockDriverState
*bs
);
206 void bdrv_append(BlockDriverState
*bs_new
, BlockDriverState
*bs_top
);
207 void bdrv_replace_in_backing_chain(BlockDriverState
*old
,
208 BlockDriverState
*new);
210 int bdrv_parse_cache_flags(const char *mode
, int *flags
);
211 int bdrv_parse_discard_flags(const char *mode
, int *flags
);
212 BdrvChild
*bdrv_open_child(const char *filename
,
213 QDict
*options
, const char *bdref_key
,
214 BlockDriverState
* parent
,
215 const BdrvChildRole
*child_role
,
216 bool allow_none
, Error
**errp
);
217 void bdrv_set_backing_hd(BlockDriverState
*bs
, BlockDriverState
*backing_hd
);
218 int bdrv_open_backing_file(BlockDriverState
*bs
, QDict
*parent_options
,
219 const char *bdref_key
, Error
**errp
);
220 int bdrv_open(BlockDriverState
**pbs
, const char *filename
,
221 const char *reference
, QDict
*options
, int flags
, Error
**errp
);
222 BlockReopenQueue
*bdrv_reopen_queue(BlockReopenQueue
*bs_queue
,
223 BlockDriverState
*bs
,
224 QDict
*options
, int flags
);
225 int bdrv_reopen_multiple(BlockReopenQueue
*bs_queue
, Error
**errp
);
226 int bdrv_reopen(BlockDriverState
*bs
, int bdrv_flags
, Error
**errp
);
227 int bdrv_reopen_prepare(BDRVReopenState
*reopen_state
,
228 BlockReopenQueue
*queue
, Error
**errp
);
229 void bdrv_reopen_commit(BDRVReopenState
*reopen_state
);
230 void bdrv_reopen_abort(BDRVReopenState
*reopen_state
);
231 int bdrv_read(BlockDriverState
*bs
, int64_t sector_num
,
232 uint8_t *buf
, int nb_sectors
);
233 int bdrv_read_unthrottled(BlockDriverState
*bs
, int64_t sector_num
,
234 uint8_t *buf
, int nb_sectors
);
235 int bdrv_write(BlockDriverState
*bs
, int64_t sector_num
,
236 const uint8_t *buf
, int nb_sectors
);
237 int bdrv_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
238 int nb_sectors
, BdrvRequestFlags flags
);
239 BlockAIOCB
*bdrv_aio_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
240 int nb_sectors
, BdrvRequestFlags flags
,
241 BlockCompletionFunc
*cb
, void *opaque
);
242 int bdrv_make_zero(BlockDriverState
*bs
, BdrvRequestFlags flags
);
243 int bdrv_pread(BlockDriverState
*bs
, int64_t offset
,
244 void *buf
, int count
);
245 int bdrv_pwrite(BlockDriverState
*bs
, int64_t offset
,
246 const void *buf
, int count
);
247 int bdrv_pwritev(BlockDriverState
*bs
, int64_t offset
, QEMUIOVector
*qiov
);
248 int bdrv_pwrite_sync(BlockDriverState
*bs
, int64_t offset
,
249 const void *buf
, int count
);
250 int coroutine_fn
bdrv_co_readv(BlockDriverState
*bs
, int64_t sector_num
,
251 int nb_sectors
, QEMUIOVector
*qiov
);
252 int coroutine_fn
bdrv_co_copy_on_readv(BlockDriverState
*bs
,
253 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
254 int coroutine_fn
bdrv_co_readv_no_serialising(BlockDriverState
*bs
,
255 int64_t sector_num
, int nb_sectors
, QEMUIOVector
*qiov
);
256 int coroutine_fn
bdrv_co_writev(BlockDriverState
*bs
, int64_t sector_num
,
257 int nb_sectors
, QEMUIOVector
*qiov
);
259 * Efficiently zero a region of the disk image. Note that this is a regular
260 * I/O request like read or write and should have a reasonable size. This
261 * function is not suitable for zeroing the entire image in a single request
262 * because it may allocate memory for the entire region.
264 int coroutine_fn
bdrv_co_write_zeroes(BlockDriverState
*bs
, int64_t sector_num
,
265 int nb_sectors
, BdrvRequestFlags flags
);
266 BlockDriverState
*bdrv_find_backing_image(BlockDriverState
*bs
,
267 const char *backing_file
);
268 int bdrv_get_backing_file_depth(BlockDriverState
*bs
);
269 void bdrv_refresh_filename(BlockDriverState
*bs
);
270 int bdrv_truncate(BlockDriverState
*bs
, int64_t offset
);
271 int64_t bdrv_nb_sectors(BlockDriverState
*bs
);
272 int64_t bdrv_getlength(BlockDriverState
*bs
);
273 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
);
274 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
);
275 void bdrv_refresh_limits(BlockDriverState
*bs
, Error
**errp
);
276 int bdrv_commit(BlockDriverState
*bs
);
277 int bdrv_commit_all(void);
278 int bdrv_change_backing_file(BlockDriverState
*bs
,
279 const char *backing_file
, const char *backing_fmt
);
280 void bdrv_register(BlockDriver
*bdrv
);
281 int bdrv_drop_intermediate(BlockDriverState
*active
, BlockDriverState
*top
,
282 BlockDriverState
*base
,
283 const char *backing_file_str
);
284 BlockDriverState
*bdrv_find_overlay(BlockDriverState
*active
,
285 BlockDriverState
*bs
);
286 BlockDriverState
*bdrv_find_base(BlockDriverState
*bs
);
289 typedef struct BdrvCheckResult
{
293 int corruptions_fixed
;
295 int64_t image_end_offset
;
304 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
, BdrvCheckMode fix
);
306 /* The units of offset and total_work_size may be chosen arbitrarily by the
307 * block driver; total_work_size may change during the course of the amendment
309 typedef void BlockDriverAmendStatusCB(BlockDriverState
*bs
, int64_t offset
,
310 int64_t total_work_size
, void *opaque
);
311 int bdrv_amend_options(BlockDriverState
*bs_new
, QemuOpts
*opts
,
312 BlockDriverAmendStatusCB
*status_cb
, void *cb_opaque
);
314 /* external snapshots */
315 bool bdrv_recurse_is_first_non_filter(BlockDriverState
*bs
,
316 BlockDriverState
*candidate
);
317 bool bdrv_is_first_non_filter(BlockDriverState
*candidate
);
319 /* check if a named node can be replaced when doing drive-mirror */
320 BlockDriverState
*check_to_replace_node(BlockDriverState
*parent_bs
,
321 const char *node_name
, Error
**errp
);
323 /* async block I/O */
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
);
371 int bdrv_inactivate_all(void);
373 /* Ensure contents are flushed to disk. */
374 int bdrv_flush(BlockDriverState
*bs
);
375 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
);
376 int bdrv_flush_all(void);
377 void bdrv_close_all(void);
378 void bdrv_drain(BlockDriverState
*bs
);
379 void bdrv_drain_all(void);
381 int bdrv_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
382 int bdrv_co_discard(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
);
383 int bdrv_has_zero_init_1(BlockDriverState
*bs
);
384 int bdrv_has_zero_init(BlockDriverState
*bs
);
385 bool bdrv_unallocated_blocks_are_zero(BlockDriverState
*bs
);
386 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState
*bs
);
387 int64_t bdrv_get_block_status(BlockDriverState
*bs
, int64_t sector_num
,
388 int nb_sectors
, int *pnum
,
389 BlockDriverState
**file
);
390 int64_t bdrv_get_block_status_above(BlockDriverState
*bs
,
391 BlockDriverState
*base
,
393 int nb_sectors
, int *pnum
,
394 BlockDriverState
**file
);
395 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
397 int bdrv_is_allocated_above(BlockDriverState
*top
, BlockDriverState
*base
,
398 int64_t sector_num
, int nb_sectors
, int *pnum
);
400 int bdrv_is_read_only(BlockDriverState
*bs
);
401 int bdrv_is_sg(BlockDriverState
*bs
);
402 int bdrv_enable_write_cache(BlockDriverState
*bs
);
403 void bdrv_set_enable_write_cache(BlockDriverState
*bs
, bool wce
);
404 bool bdrv_is_inserted(BlockDriverState
*bs
);
405 int bdrv_media_changed(BlockDriverState
*bs
);
406 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
);
407 void bdrv_eject(BlockDriverState
*bs
, bool eject_flag
);
408 const char *bdrv_get_format_name(BlockDriverState
*bs
);
409 BlockDriverState
*bdrv_find_node(const char *node_name
);
410 BlockDeviceInfoList
*bdrv_named_nodes_list(Error
**errp
);
411 BlockDriverState
*bdrv_lookup_bs(const char *device
,
412 const char *node_name
,
414 bool bdrv_chain_contains(BlockDriverState
*top
, BlockDriverState
*base
);
415 BlockDriverState
*bdrv_next_node(BlockDriverState
*bs
);
416 BlockDriverState
*bdrv_next(BlockDriverState
*bs
);
417 int bdrv_is_encrypted(BlockDriverState
*bs
);
418 int bdrv_key_required(BlockDriverState
*bs
);
419 int bdrv_set_key(BlockDriverState
*bs
, const char *key
);
420 void bdrv_add_key(BlockDriverState
*bs
, const char *key
, Error
**errp
);
421 int bdrv_query_missing_keys(void);
422 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
424 const char *bdrv_get_node_name(const BlockDriverState
*bs
);
425 const char *bdrv_get_device_name(const BlockDriverState
*bs
);
426 const char *bdrv_get_device_or_node_name(const BlockDriverState
*bs
);
427 int bdrv_get_flags(BlockDriverState
*bs
);
428 int bdrv_write_compressed(BlockDriverState
*bs
, int64_t sector_num
,
429 const uint8_t *buf
, int nb_sectors
);
430 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
431 ImageInfoSpecific
*bdrv_get_specific_info(BlockDriverState
*bs
);
432 void bdrv_round_to_clusters(BlockDriverState
*bs
,
433 int64_t sector_num
, int nb_sectors
,
434 int64_t *cluster_sector_num
,
435 int *cluster_nb_sectors
);
437 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
);
438 void bdrv_get_backing_filename(BlockDriverState
*bs
,
439 char *filename
, int filename_size
);
440 void bdrv_get_full_backing_filename(BlockDriverState
*bs
,
441 char *dest
, size_t sz
, Error
**errp
);
442 void bdrv_get_full_backing_filename_from_filename(const char *backed
,
444 char *dest
, size_t sz
,
446 int bdrv_is_snapshot(BlockDriverState
*bs
);
448 int path_has_protocol(const char *path
);
449 int path_is_absolute(const char *path
);
450 void path_combine(char *dest
, int dest_size
,
451 const char *base_path
,
452 const char *filename
);
454 int bdrv_writev_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
455 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
456 int64_t pos
, int size
);
458 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
459 int64_t pos
, int size
);
461 void bdrv_img_create(const char *filename
, const char *fmt
,
462 const char *base_filename
, const char *base_fmt
,
463 char *options
, uint64_t img_size
, int flags
,
464 Error
**errp
, bool quiet
);
466 /* Returns the alignment in bytes that is required so that no bounce buffer
467 * is required throughout the stack */
468 size_t bdrv_min_mem_align(BlockDriverState
*bs
);
469 /* Returns optimal alignment in bytes for bounce buffer */
470 size_t bdrv_opt_mem_align(BlockDriverState
*bs
);
471 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
);
472 void *qemu_blockalign0(BlockDriverState
*bs
, size_t size
);
473 void *qemu_try_blockalign(BlockDriverState
*bs
, size_t size
);
474 void *qemu_try_blockalign0(BlockDriverState
*bs
, size_t size
);
475 bool bdrv_qiov_is_aligned(BlockDriverState
*bs
, QEMUIOVector
*qiov
);
477 void bdrv_enable_copy_on_read(BlockDriverState
*bs
);
478 void bdrv_disable_copy_on_read(BlockDriverState
*bs
);
480 void bdrv_ref(BlockDriverState
*bs
);
481 void bdrv_unref(BlockDriverState
*bs
);
482 void bdrv_unref_child(BlockDriverState
*parent
, BdrvChild
*child
);
484 bool bdrv_op_is_blocked(BlockDriverState
*bs
, BlockOpType op
, Error
**errp
);
485 void bdrv_op_block(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
486 void bdrv_op_unblock(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
487 void bdrv_op_block_all(BlockDriverState
*bs
, Error
*reason
);
488 void bdrv_op_unblock_all(BlockDriverState
*bs
, Error
*reason
);
489 bool bdrv_op_blocker_is_empty(BlockDriverState
*bs
);
491 #define BLKDBG_EVENT(child, evt) \
494 bdrv_debug_event(child->bs, evt); \
498 void bdrv_debug_event(BlockDriverState
*bs
, BlkdebugEvent event
);
500 int bdrv_debug_breakpoint(BlockDriverState
*bs
, const char *event
,
502 int bdrv_debug_remove_breakpoint(BlockDriverState
*bs
, const char *tag
);
503 int bdrv_debug_resume(BlockDriverState
*bs
, const char *tag
);
504 bool bdrv_debug_is_suspended(BlockDriverState
*bs
, const char *tag
);
507 * bdrv_get_aio_context:
509 * Returns: the currently bound #AioContext
511 AioContext
*bdrv_get_aio_context(BlockDriverState
*bs
);
514 * bdrv_set_aio_context:
516 * Changes the #AioContext used for fd handlers, timers, and BHs by this
517 * BlockDriverState and all its children.
519 * This function must be called with iothread lock held.
521 void bdrv_set_aio_context(BlockDriverState
*bs
, AioContext
*new_context
);
522 int bdrv_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
);
523 int bdrv_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
);
525 void bdrv_io_plug(BlockDriverState
*bs
);
526 void bdrv_io_unplug(BlockDriverState
*bs
);
527 void bdrv_flush_io_queue(BlockDriverState
*bs
);
530 * bdrv_drained_begin:
532 * Begin a quiesced section for exclusive access to the BDS, by disabling
533 * external request sources including NBD server and device model. Note that
534 * this doesn't block timers or coroutines from submitting more requests, which
535 * means block_job_pause is still necessary.
537 * This function can be recursive.
539 void bdrv_drained_begin(BlockDriverState
*bs
);
544 * End a quiescent section started by bdrv_drained_begin().
546 void bdrv_drained_end(BlockDriverState
*bs
);