6 #include "qemu/option.h"
7 #include "qemu/coroutine.h"
8 #include "block/accounting.h"
9 #include "block/dirty-bitmap.h"
10 #include "block/blockjob.h"
11 #include "qapi/qmp/qobject.h"
12 #include "qapi-types.h"
13 #include "qemu/hbitmap.h"
16 typedef struct BlockDriver BlockDriver
;
17 typedef struct BdrvChild BdrvChild
;
18 typedef struct BdrvChildRole BdrvChildRole
;
20 typedef struct BlockDriverInfo
{
21 /* in bytes, 0 if irrelevant */
23 /* offset at which the VM state can be saved (0 if not possible) */
24 int64_t vm_state_offset
;
27 * True if unallocated blocks read back as zeroes. This is equivalent
28 * to the LBPRZ flag in the SCSI logical block provisioning page.
30 bool unallocated_blocks_are_zero
;
32 * True if the driver can optimize writing zeroes by unmapping
33 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
34 * with the difference that in qemu a discard is allowed to silently
35 * fail. Therefore we have to use bdrv_pwrite_zeroes with the
36 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
37 * After this call the driver has to guarantee that the contents read
38 * back as zero. It is additionally required that the block device is
39 * opened with BDRV_O_UNMAP flag for this to work.
41 bool can_write_zeroes_with_unmap
;
43 * True if this block driver only supports compressed writes
45 bool needs_compressed_writes
;
48 typedef struct BlockFragInfo
{
49 uint64_t allocated_clusters
;
50 uint64_t total_clusters
;
51 uint64_t fragmented_clusters
;
52 uint64_t compressed_clusters
;
56 BDRV_REQ_COPY_ON_READ
= 0x1,
57 BDRV_REQ_ZERO_WRITE
= 0x2,
58 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
59 * is allowed to optimize a write zeroes request by unmapping (discarding)
60 * blocks if it is guaranteed that the result will read back as
61 * zeroes. The flag is only passed to the driver if the block device is
62 * opened with BDRV_O_UNMAP.
64 BDRV_REQ_MAY_UNMAP
= 0x4,
65 BDRV_REQ_NO_SERIALISING
= 0x8,
67 BDRV_REQ_WRITE_COMPRESSED
= 0x20,
69 /* Mask of valid flags */
73 typedef struct BlockSizes
{
78 typedef struct HDGeometry
{
84 #define BDRV_O_RDWR 0x0002
85 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */
86 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
87 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
88 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
89 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
90 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
91 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
92 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
93 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */
94 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
95 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
96 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
97 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
98 select an appropriate protocol driver,
99 ignoring the format layer */
100 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
102 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
105 /* Option names of options parsed by the block layer */
107 #define BDRV_OPT_CACHE_WB "cache.writeback"
108 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
109 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
110 #define BDRV_OPT_READ_ONLY "read-only"
111 #define BDRV_OPT_DISCARD "discard"
112 #define BDRV_OPT_FORCE_SHARE "force-share"
115 #define BDRV_SECTOR_BITS 9
116 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
117 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
119 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
120 INT_MAX >> BDRV_SECTOR_BITS)
121 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS)
124 * Allocation status flags
125 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status.
126 * BDRV_BLOCK_ZERO: sectors read as zero
127 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by
128 * bdrv_get_block_status.
129 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
130 * layer (as opposed to the backing file)
131 * BDRV_BLOCK_RAW: used internally to indicate that the request
132 * was answered by the raw driver and that one
133 * should look in bs->file directly.
135 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
136 * bs->file where sector data can be read from as raw data.
138 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
140 * DATA ZERO OFFSET_VALID
141 * t t t sectors read as zero, bs->file is zero at offset
142 * t f t sectors read as valid from bs->file at offset
143 * f t t sectors preallocated, read as zero, bs->file not
144 * necessarily zero at offset
145 * f f t sectors preallocated but read from backing_hd,
146 * bs->file contains garbage at offset
147 * t t f sectors preallocated, read as zero, unknown offset
148 * t f f sectors read from unknown file or offset
149 * f t f not allocated or unknown offset, read as zero
150 * f f f not allocated or unknown offset, read from backing_hd
152 #define BDRV_BLOCK_DATA 0x01
153 #define BDRV_BLOCK_ZERO 0x02
154 #define BDRV_BLOCK_OFFSET_VALID 0x04
155 #define BDRV_BLOCK_RAW 0x08
156 #define BDRV_BLOCK_ALLOCATED 0x10
157 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
159 typedef QSIMPLEQ_HEAD(BlockReopenQueue
, BlockReopenQueueEntry
) BlockReopenQueue
;
161 typedef struct BDRVReopenState
{
162 BlockDriverState
*bs
;
165 QDict
*explicit_options
;
170 * Block operation types
172 typedef enum BlockOpType
{
173 BLOCK_OP_TYPE_BACKUP_SOURCE
,
174 BLOCK_OP_TYPE_BACKUP_TARGET
,
175 BLOCK_OP_TYPE_CHANGE
,
176 BLOCK_OP_TYPE_COMMIT_SOURCE
,
177 BLOCK_OP_TYPE_COMMIT_TARGET
,
178 BLOCK_OP_TYPE_DATAPLANE
,
179 BLOCK_OP_TYPE_DRIVE_DEL
,
181 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
182 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
,
183 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
,
184 BLOCK_OP_TYPE_MIRROR_SOURCE
,
185 BLOCK_OP_TYPE_MIRROR_TARGET
,
186 BLOCK_OP_TYPE_RESIZE
,
187 BLOCK_OP_TYPE_STREAM
,
188 BLOCK_OP_TYPE_REPLACE
,
192 /* Block node permission constants */
195 * A user that has the "permission" of consistent reads is guaranteed that
196 * their view of the contents of the block device is complete and
197 * self-consistent, representing the contents of a disk at a specific
200 * For most block devices (including their backing files) this is true, but
201 * the property cannot be maintained in a few situations like for
202 * intermediate nodes of a commit block job.
204 BLK_PERM_CONSISTENT_READ
= 0x01,
206 /** This permission is required to change the visible disk contents. */
207 BLK_PERM_WRITE
= 0x02,
210 * This permission (which is weaker than BLK_PERM_WRITE) is both enough and
211 * required for writes to the block node when the caller promises that
212 * the visible disk content doesn't change.
214 BLK_PERM_WRITE_UNCHANGED
= 0x04,
216 /** This permission is required to change the size of a block node. */
217 BLK_PERM_RESIZE
= 0x08,
220 * This permission is required to change the node that this BdrvChild
223 BLK_PERM_GRAPH_MOD
= 0x10,
228 char *bdrv_perm_names(uint64_t perm
);
230 /* disk I/O throttling */
231 void bdrv_init(void);
232 void bdrv_init_with_whitelist(void);
233 bool bdrv_uses_whitelist(void);
234 BlockDriver
*bdrv_find_protocol(const char *filename
,
235 bool allow_protocol_prefix
,
237 BlockDriver
*bdrv_find_format(const char *format_name
);
238 int bdrv_create(BlockDriver
*drv
, const char* filename
,
239 QemuOpts
*opts
, Error
**errp
);
240 int bdrv_create_file(const char *filename
, QemuOpts
*opts
, Error
**errp
);
241 BlockDriverState
*bdrv_new(void);
242 void bdrv_append(BlockDriverState
*bs_new
, BlockDriverState
*bs_top
,
244 void bdrv_replace_node(BlockDriverState
*from
, BlockDriverState
*to
,
247 int bdrv_parse_cache_mode(const char *mode
, int *flags
, bool *writethrough
);
248 int bdrv_parse_discard_flags(const char *mode
, int *flags
);
249 BdrvChild
*bdrv_open_child(const char *filename
,
250 QDict
*options
, const char *bdref_key
,
251 BlockDriverState
* parent
,
252 const BdrvChildRole
*child_role
,
253 bool allow_none
, Error
**errp
);
254 void bdrv_set_backing_hd(BlockDriverState
*bs
, BlockDriverState
*backing_hd
,
256 int bdrv_open_backing_file(BlockDriverState
*bs
, QDict
*parent_options
,
257 const char *bdref_key
, Error
**errp
);
258 BlockDriverState
*bdrv_open(const char *filename
, const char *reference
,
259 QDict
*options
, int flags
, Error
**errp
);
260 BlockDriverState
*bdrv_new_open_driver(BlockDriver
*drv
, const char *node_name
,
261 int flags
, Error
**errp
);
262 BlockReopenQueue
*bdrv_reopen_queue(BlockReopenQueue
*bs_queue
,
263 BlockDriverState
*bs
,
264 QDict
*options
, int flags
);
265 int bdrv_reopen_multiple(AioContext
*ctx
, BlockReopenQueue
*bs_queue
, Error
**errp
);
266 int bdrv_reopen(BlockDriverState
*bs
, int bdrv_flags
, Error
**errp
);
267 int bdrv_reopen_prepare(BDRVReopenState
*reopen_state
,
268 BlockReopenQueue
*queue
, Error
**errp
);
269 void bdrv_reopen_commit(BDRVReopenState
*reopen_state
);
270 void bdrv_reopen_abort(BDRVReopenState
*reopen_state
);
271 int bdrv_read(BdrvChild
*child
, int64_t sector_num
,
272 uint8_t *buf
, int nb_sectors
);
273 int bdrv_write(BdrvChild
*child
, int64_t sector_num
,
274 const uint8_t *buf
, int nb_sectors
);
275 int bdrv_pwrite_zeroes(BdrvChild
*child
, int64_t offset
,
276 int count
, BdrvRequestFlags flags
);
277 int bdrv_make_zero(BdrvChild
*child
, BdrvRequestFlags flags
);
278 int bdrv_pread(BdrvChild
*child
, int64_t offset
, void *buf
, int bytes
);
279 int bdrv_preadv(BdrvChild
*child
, int64_t offset
, QEMUIOVector
*qiov
);
280 int bdrv_pwrite(BdrvChild
*child
, int64_t offset
, const void *buf
, int bytes
);
281 int bdrv_pwritev(BdrvChild
*child
, int64_t offset
, QEMUIOVector
*qiov
);
282 int bdrv_pwrite_sync(BdrvChild
*child
, int64_t offset
,
283 const void *buf
, int count
);
284 int coroutine_fn
bdrv_co_readv(BdrvChild
*child
, int64_t sector_num
,
285 int nb_sectors
, QEMUIOVector
*qiov
);
286 int coroutine_fn
bdrv_co_writev(BdrvChild
*child
, int64_t sector_num
,
287 int nb_sectors
, QEMUIOVector
*qiov
);
289 * Efficiently zero a region of the disk image. Note that this is a regular
290 * I/O request like read or write and should have a reasonable size. This
291 * function is not suitable for zeroing the entire image in a single request
292 * because it may allocate memory for the entire region.
294 int coroutine_fn
bdrv_co_pwrite_zeroes(BdrvChild
*child
, int64_t offset
,
295 int count
, BdrvRequestFlags flags
);
296 BlockDriverState
*bdrv_find_backing_image(BlockDriverState
*bs
,
297 const char *backing_file
);
298 int bdrv_get_backing_file_depth(BlockDriverState
*bs
);
299 void bdrv_refresh_filename(BlockDriverState
*bs
);
300 int bdrv_truncate(BdrvChild
*child
, int64_t offset
, Error
**errp
);
301 int64_t bdrv_nb_sectors(BlockDriverState
*bs
);
302 int64_t bdrv_getlength(BlockDriverState
*bs
);
303 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
);
304 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
);
305 void bdrv_refresh_limits(BlockDriverState
*bs
, Error
**errp
);
306 int bdrv_commit(BlockDriverState
*bs
);
307 int bdrv_change_backing_file(BlockDriverState
*bs
,
308 const char *backing_file
, const char *backing_fmt
);
309 void bdrv_register(BlockDriver
*bdrv
);
310 int bdrv_drop_intermediate(BlockDriverState
*active
, BlockDriverState
*top
,
311 BlockDriverState
*base
,
312 const char *backing_file_str
);
313 BlockDriverState
*bdrv_find_overlay(BlockDriverState
*active
,
314 BlockDriverState
*bs
);
315 BlockDriverState
*bdrv_find_base(BlockDriverState
*bs
);
318 typedef struct BdrvCheckResult
{
322 int corruptions_fixed
;
324 int64_t image_end_offset
;
333 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
, BdrvCheckMode fix
);
335 /* The units of offset and total_work_size may be chosen arbitrarily by the
336 * block driver; total_work_size may change during the course of the amendment
338 typedef void BlockDriverAmendStatusCB(BlockDriverState
*bs
, int64_t offset
,
339 int64_t total_work_size
, void *opaque
);
340 int bdrv_amend_options(BlockDriverState
*bs_new
, QemuOpts
*opts
,
341 BlockDriverAmendStatusCB
*status_cb
, void *cb_opaque
);
343 /* external snapshots */
344 bool bdrv_recurse_is_first_non_filter(BlockDriverState
*bs
,
345 BlockDriverState
*candidate
);
346 bool bdrv_is_first_non_filter(BlockDriverState
*candidate
);
348 /* check if a named node can be replaced when doing drive-mirror */
349 BlockDriverState
*check_to_replace_node(BlockDriverState
*parent_bs
,
350 const char *node_name
, Error
**errp
);
352 /* async block I/O */
353 BlockAIOCB
*bdrv_aio_readv(BdrvChild
*child
, int64_t sector_num
,
354 QEMUIOVector
*iov
, int nb_sectors
,
355 BlockCompletionFunc
*cb
, void *opaque
);
356 BlockAIOCB
*bdrv_aio_writev(BdrvChild
*child
, int64_t sector_num
,
357 QEMUIOVector
*iov
, int nb_sectors
,
358 BlockCompletionFunc
*cb
, void *opaque
);
359 BlockAIOCB
*bdrv_aio_flush(BlockDriverState
*bs
,
360 BlockCompletionFunc
*cb
, void *opaque
);
361 void bdrv_aio_cancel(BlockAIOCB
*acb
);
362 void bdrv_aio_cancel_async(BlockAIOCB
*acb
);
364 /* sg packet commands */
365 int bdrv_co_ioctl(BlockDriverState
*bs
, int req
, void *buf
);
367 /* Invalidate any cached metadata used by image formats */
368 void bdrv_invalidate_cache(BlockDriverState
*bs
, Error
**errp
);
369 void bdrv_invalidate_cache_all(Error
**errp
);
370 int bdrv_inactivate_all(void);
372 void blk_resume_after_migration(Error
**errp
);
374 /* Ensure contents are flushed to disk. */
375 int bdrv_flush(BlockDriverState
*bs
);
376 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
);
377 int bdrv_flush_all(void);
378 void bdrv_close_all(void);
379 void bdrv_drain(BlockDriverState
*bs
);
380 void coroutine_fn
bdrv_co_drain(BlockDriverState
*bs
);
381 void bdrv_drain_all_begin(void);
382 void bdrv_drain_all_end(void);
383 void bdrv_drain_all(void);
385 #define BDRV_POLL_WHILE(bs, cond) ({ \
386 bool waited_ = false; \
388 BlockDriverState *bs_ = (bs); \
389 AioContext *ctx_ = bdrv_get_aio_context(bs_); \
390 if (aio_context_in_iothread(ctx_)) { \
391 while ((cond) || busy_) { \
392 busy_ = aio_poll(ctx_, (cond)); \
393 waited_ |= !!(cond) | busy_; \
396 assert(qemu_get_current_aio_context() == \
397 qemu_get_aio_context()); \
398 /* Ask bdrv_dec_in_flight to wake up the main \
399 * QEMU AioContext. Extra I/O threads never take \
400 * other I/O threads' AioContexts (see for example \
401 * block_job_defer_to_main_loop for how to do it). \
403 assert(!bs_->wakeup); \
404 bs_->wakeup = true; \
407 waited_ = busy_ = true; \
408 aio_context_release(ctx_); \
409 aio_poll(qemu_get_aio_context(), true); \
410 aio_context_acquire(ctx_); \
412 busy_ = aio_poll(ctx_, false); \
416 bs_->wakeup = false; \
420 int bdrv_pdiscard(BlockDriverState
*bs
, int64_t offset
, int count
);
421 int bdrv_co_pdiscard(BlockDriverState
*bs
, int64_t offset
, int count
);
422 int bdrv_has_zero_init_1(BlockDriverState
*bs
);
423 int bdrv_has_zero_init(BlockDriverState
*bs
);
424 bool bdrv_unallocated_blocks_are_zero(BlockDriverState
*bs
);
425 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState
*bs
);
426 int64_t bdrv_get_block_status(BlockDriverState
*bs
, int64_t sector_num
,
427 int nb_sectors
, int *pnum
,
428 BlockDriverState
**file
);
429 int64_t bdrv_get_block_status_above(BlockDriverState
*bs
,
430 BlockDriverState
*base
,
432 int nb_sectors
, int *pnum
,
433 BlockDriverState
**file
);
434 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t sector_num
, int nb_sectors
,
436 int bdrv_is_allocated_above(BlockDriverState
*top
, BlockDriverState
*base
,
437 int64_t sector_num
, int nb_sectors
, int *pnum
);
439 bool bdrv_is_read_only(BlockDriverState
*bs
);
440 int bdrv_can_set_read_only(BlockDriverState
*bs
, bool read_only
, Error
**errp
);
441 int bdrv_set_read_only(BlockDriverState
*bs
, bool read_only
, Error
**errp
);
442 bool bdrv_is_sg(BlockDriverState
*bs
);
443 bool bdrv_is_inserted(BlockDriverState
*bs
);
444 int bdrv_media_changed(BlockDriverState
*bs
);
445 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
);
446 void bdrv_eject(BlockDriverState
*bs
, bool eject_flag
);
447 const char *bdrv_get_format_name(BlockDriverState
*bs
);
448 BlockDriverState
*bdrv_find_node(const char *node_name
);
449 BlockDeviceInfoList
*bdrv_named_nodes_list(Error
**errp
);
450 BlockDriverState
*bdrv_lookup_bs(const char *device
,
451 const char *node_name
,
453 bool bdrv_chain_contains(BlockDriverState
*top
, BlockDriverState
*base
);
454 BlockDriverState
*bdrv_next_node(BlockDriverState
*bs
);
456 typedef struct BdrvNextIterator
{
458 BDRV_NEXT_BACKEND_ROOTS
,
459 BDRV_NEXT_MONITOR_OWNED
,
462 BlockDriverState
*bs
;
465 BlockDriverState
*bdrv_first(BdrvNextIterator
*it
);
466 BlockDriverState
*bdrv_next(BdrvNextIterator
*it
);
468 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
);
469 bool bdrv_is_encrypted(BlockDriverState
*bs
);
470 bool bdrv_key_required(BlockDriverState
*bs
);
471 int bdrv_set_key(BlockDriverState
*bs
, const char *key
);
472 void bdrv_add_key(BlockDriverState
*bs
, const char *key
, Error
**errp
);
473 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
475 const char *bdrv_get_node_name(const BlockDriverState
*bs
);
476 const char *bdrv_get_device_name(const BlockDriverState
*bs
);
477 const char *bdrv_get_device_or_node_name(const BlockDriverState
*bs
);
478 int bdrv_get_flags(BlockDriverState
*bs
);
479 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
480 ImageInfoSpecific
*bdrv_get_specific_info(BlockDriverState
*bs
);
481 void bdrv_round_sectors_to_clusters(BlockDriverState
*bs
,
482 int64_t sector_num
, int nb_sectors
,
483 int64_t *cluster_sector_num
,
484 int *cluster_nb_sectors
);
485 void bdrv_round_to_clusters(BlockDriverState
*bs
,
486 int64_t offset
, unsigned int bytes
,
487 int64_t *cluster_offset
,
488 unsigned int *cluster_bytes
);
490 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
);
491 void bdrv_get_backing_filename(BlockDriverState
*bs
,
492 char *filename
, int filename_size
);
493 void bdrv_get_full_backing_filename(BlockDriverState
*bs
,
494 char *dest
, size_t sz
, Error
**errp
);
495 void bdrv_get_full_backing_filename_from_filename(const char *backed
,
497 char *dest
, size_t sz
,
500 int path_has_protocol(const char *path
);
501 int path_is_absolute(const char *path
);
502 void path_combine(char *dest
, int dest_size
,
503 const char *base_path
,
504 const char *filename
);
506 int bdrv_readv_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
507 int bdrv_writev_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
508 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
509 int64_t pos
, int size
);
511 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
512 int64_t pos
, int size
);
514 void bdrv_img_create(const char *filename
, const char *fmt
,
515 const char *base_filename
, const char *base_fmt
,
516 char *options
, uint64_t img_size
, int flags
,
517 bool quiet
, Error
**errp
);
519 /* Returns the alignment in bytes that is required so that no bounce buffer
520 * is required throughout the stack */
521 size_t bdrv_min_mem_align(BlockDriverState
*bs
);
522 /* Returns optimal alignment in bytes for bounce buffer */
523 size_t bdrv_opt_mem_align(BlockDriverState
*bs
);
524 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
);
525 void *qemu_blockalign0(BlockDriverState
*bs
, size_t size
);
526 void *qemu_try_blockalign(BlockDriverState
*bs
, size_t size
);
527 void *qemu_try_blockalign0(BlockDriverState
*bs
, size_t size
);
528 bool bdrv_qiov_is_aligned(BlockDriverState
*bs
, QEMUIOVector
*qiov
);
530 void bdrv_enable_copy_on_read(BlockDriverState
*bs
);
531 void bdrv_disable_copy_on_read(BlockDriverState
*bs
);
533 void bdrv_ref(BlockDriverState
*bs
);
534 void bdrv_unref(BlockDriverState
*bs
);
535 void bdrv_unref_child(BlockDriverState
*parent
, BdrvChild
*child
);
536 BdrvChild
*bdrv_attach_child(BlockDriverState
*parent_bs
,
537 BlockDriverState
*child_bs
,
538 const char *child_name
,
539 const BdrvChildRole
*child_role
,
542 bool bdrv_op_is_blocked(BlockDriverState
*bs
, BlockOpType op
, Error
**errp
);
543 void bdrv_op_block(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
544 void bdrv_op_unblock(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
545 void bdrv_op_block_all(BlockDriverState
*bs
, Error
*reason
);
546 void bdrv_op_unblock_all(BlockDriverState
*bs
, Error
*reason
);
547 bool bdrv_op_blocker_is_empty(BlockDriverState
*bs
);
549 #define BLKDBG_EVENT(child, evt) \
552 bdrv_debug_event(child->bs, evt); \
556 void bdrv_debug_event(BlockDriverState
*bs
, BlkdebugEvent event
);
558 int bdrv_debug_breakpoint(BlockDriverState
*bs
, const char *event
,
560 int bdrv_debug_remove_breakpoint(BlockDriverState
*bs
, const char *tag
);
561 int bdrv_debug_resume(BlockDriverState
*bs
, const char *tag
);
562 bool bdrv_debug_is_suspended(BlockDriverState
*bs
, const char *tag
);
565 * bdrv_get_aio_context:
567 * Returns: the currently bound #AioContext
569 AioContext
*bdrv_get_aio_context(BlockDriverState
*bs
);
572 * Transfer control to @co in the aio context of @bs
574 void bdrv_coroutine_enter(BlockDriverState
*bs
, Coroutine
*co
);
577 * bdrv_set_aio_context:
579 * Changes the #AioContext used for fd handlers, timers, and BHs by this
580 * BlockDriverState and all its children.
582 * This function must be called with iothread lock held.
584 void bdrv_set_aio_context(BlockDriverState
*bs
, AioContext
*new_context
);
585 int bdrv_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
);
586 int bdrv_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
);
588 void bdrv_io_plug(BlockDriverState
*bs
);
589 void bdrv_io_unplug(BlockDriverState
*bs
);
592 * bdrv_parent_drained_begin:
594 * Begin a quiesced section of all users of @bs. This is part of
595 * bdrv_drained_begin.
597 void bdrv_parent_drained_begin(BlockDriverState
*bs
);
600 * bdrv_parent_drained_end:
602 * End a quiesced section of all users of @bs. This is part of
605 void bdrv_parent_drained_end(BlockDriverState
*bs
);
608 * bdrv_drained_begin:
610 * Begin a quiesced section for exclusive access to the BDS, by disabling
611 * external request sources including NBD server and device model. Note that
612 * this doesn't block timers or coroutines from submitting more requests, which
613 * means block_job_pause is still necessary.
615 * This function can be recursive.
617 void bdrv_drained_begin(BlockDriverState
*bs
);
622 * End a quiescent section started by bdrv_drained_begin().
624 void bdrv_drained_end(BlockDriverState
*bs
);
626 void bdrv_add_child(BlockDriverState
*parent
, BlockDriverState
*child
,
628 void bdrv_del_child(BlockDriverState
*parent
, BdrvChild
*child
, Error
**errp
);