5 #include "qapi-types.h"
7 #include "qemu/coroutine.h"
8 #include "block/accounting.h"
9 #include "block/dirty-bitmap.h"
10 #include "block/blockjob.h"
11 #include "qemu/hbitmap.h"
14 typedef struct BlockDriver BlockDriver
;
15 typedef struct BdrvChild BdrvChild
;
16 typedef struct BdrvChildRole BdrvChildRole
;
18 typedef struct BlockDriverInfo
{
19 /* in bytes, 0 if irrelevant */
21 /* offset at which the VM state can be saved (0 if not possible) */
22 int64_t vm_state_offset
;
25 * True if unallocated blocks read back as zeroes. This is equivalent
26 * to the LBPRZ flag in the SCSI logical block provisioning page.
28 bool unallocated_blocks_are_zero
;
30 * True if the driver can optimize writing zeroes by unmapping
31 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
32 * with the difference that in qemu a discard is allowed to silently
33 * fail. Therefore we have to use bdrv_pwrite_zeroes with the
34 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
35 * After this call the driver has to guarantee that the contents read
36 * back as zero. It is additionally required that the block device is
37 * opened with BDRV_O_UNMAP flag for this to work.
39 bool can_write_zeroes_with_unmap
;
41 * True if this block driver only supports compressed writes
43 bool needs_compressed_writes
;
46 typedef struct BlockFragInfo
{
47 uint64_t allocated_clusters
;
48 uint64_t total_clusters
;
49 uint64_t fragmented_clusters
;
50 uint64_t compressed_clusters
;
54 BDRV_REQ_COPY_ON_READ
= 0x1,
55 BDRV_REQ_ZERO_WRITE
= 0x2,
56 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
57 * is allowed to optimize a write zeroes request by unmapping (discarding)
58 * blocks if it is guaranteed that the result will read back as
59 * zeroes. The flag is only passed to the driver if the block device is
60 * opened with BDRV_O_UNMAP.
62 BDRV_REQ_MAY_UNMAP
= 0x4,
63 BDRV_REQ_NO_SERIALISING
= 0x8,
65 BDRV_REQ_WRITE_COMPRESSED
= 0x20,
67 /* Mask of valid flags */
71 typedef struct BlockSizes
{
76 typedef struct HDGeometry
{
82 #define BDRV_O_RDWR 0x0002
83 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */
84 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
85 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
86 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
87 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
88 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
89 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
90 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
91 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */
92 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
93 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
94 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
95 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
96 select an appropriate protocol driver,
97 ignoring the format layer */
98 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
100 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
103 /* Option names of options parsed by the block layer */
105 #define BDRV_OPT_CACHE_WB "cache.writeback"
106 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
107 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
108 #define BDRV_OPT_READ_ONLY "read-only"
109 #define BDRV_OPT_DISCARD "discard"
110 #define BDRV_OPT_FORCE_SHARE "force-share"
113 #define BDRV_SECTOR_BITS 9
114 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
115 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
117 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
118 INT_MAX >> BDRV_SECTOR_BITS)
119 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS)
122 * Allocation status flags for bdrv_block_status() and friends.
125 * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer
126 * BDRV_BLOCK_ZERO: offset reads as zero
127 * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data
128 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
129 * layer (short for DATA || ZERO), set by block layer
130 * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this layer
133 * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request
134 * that the block layer recompute the answer from the returned
135 * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID.
137 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 (BDRV_BLOCK_OFFSET_MASK) of
138 * the return value (old interface) or the entire map parameter (new
139 * interface) represent the offset in the returned BDS that is allocated for
140 * the corresponding raw data. However, whether that offset actually
141 * contains data also depends on BDRV_BLOCK_DATA, as follows:
143 * DATA ZERO OFFSET_VALID
144 * t t t sectors read as zero, returned file is zero at offset
145 * t f t sectors read as valid from file at offset
146 * f t t sectors preallocated, read as zero, returned file not
147 * necessarily zero at offset
148 * f f t sectors preallocated but read from backing_hd,
149 * returned file contains garbage at offset
150 * t t f sectors preallocated, read as zero, unknown offset
151 * t f f sectors read from unknown file or offset
152 * f t f not allocated or unknown offset, read as zero
153 * f f f not allocated or unknown offset, read from backing_hd
155 #define BDRV_BLOCK_DATA 0x01
156 #define BDRV_BLOCK_ZERO 0x02
157 #define BDRV_BLOCK_OFFSET_VALID 0x04
158 #define BDRV_BLOCK_RAW 0x08
159 #define BDRV_BLOCK_ALLOCATED 0x10
160 #define BDRV_BLOCK_EOF 0x20
161 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
163 typedef QSIMPLEQ_HEAD(BlockReopenQueue
, BlockReopenQueueEntry
) BlockReopenQueue
;
165 typedef struct BDRVReopenState
{
166 BlockDriverState
*bs
;
168 uint64_t perm
, shared_perm
;
170 QDict
*explicit_options
;
175 * Block operation types
177 typedef enum BlockOpType
{
178 BLOCK_OP_TYPE_BACKUP_SOURCE
,
179 BLOCK_OP_TYPE_BACKUP_TARGET
,
180 BLOCK_OP_TYPE_CHANGE
,
181 BLOCK_OP_TYPE_COMMIT_SOURCE
,
182 BLOCK_OP_TYPE_COMMIT_TARGET
,
183 BLOCK_OP_TYPE_DATAPLANE
,
184 BLOCK_OP_TYPE_DRIVE_DEL
,
186 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT
,
187 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT
,
188 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE
,
189 BLOCK_OP_TYPE_MIRROR_SOURCE
,
190 BLOCK_OP_TYPE_MIRROR_TARGET
,
191 BLOCK_OP_TYPE_RESIZE
,
192 BLOCK_OP_TYPE_STREAM
,
193 BLOCK_OP_TYPE_REPLACE
,
197 /* Block node permission constants */
200 * A user that has the "permission" of consistent reads is guaranteed that
201 * their view of the contents of the block device is complete and
202 * self-consistent, representing the contents of a disk at a specific
205 * For most block devices (including their backing files) this is true, but
206 * the property cannot be maintained in a few situations like for
207 * intermediate nodes of a commit block job.
209 BLK_PERM_CONSISTENT_READ
= 0x01,
211 /** This permission is required to change the visible disk contents. */
212 BLK_PERM_WRITE
= 0x02,
215 * This permission (which is weaker than BLK_PERM_WRITE) is both enough and
216 * required for writes to the block node when the caller promises that
217 * the visible disk content doesn't change.
219 BLK_PERM_WRITE_UNCHANGED
= 0x04,
221 /** This permission is required to change the size of a block node. */
222 BLK_PERM_RESIZE
= 0x08,
225 * This permission is required to change the node that this BdrvChild
228 BLK_PERM_GRAPH_MOD
= 0x10,
233 char *bdrv_perm_names(uint64_t perm
);
235 /* disk I/O throttling */
236 void bdrv_init(void);
237 void bdrv_init_with_whitelist(void);
238 bool bdrv_uses_whitelist(void);
239 BlockDriver
*bdrv_find_protocol(const char *filename
,
240 bool allow_protocol_prefix
,
242 BlockDriver
*bdrv_find_format(const char *format_name
);
243 int bdrv_create(BlockDriver
*drv
, const char* filename
,
244 QemuOpts
*opts
, Error
**errp
);
245 int bdrv_create_file(const char *filename
, QemuOpts
*opts
, Error
**errp
);
246 BlockDriverState
*bdrv_new(void);
247 void bdrv_append(BlockDriverState
*bs_new
, BlockDriverState
*bs_top
,
249 void bdrv_replace_node(BlockDriverState
*from
, BlockDriverState
*to
,
252 int bdrv_parse_cache_mode(const char *mode
, int *flags
, bool *writethrough
);
253 int bdrv_parse_discard_flags(const char *mode
, int *flags
);
254 BdrvChild
*bdrv_open_child(const char *filename
,
255 QDict
*options
, const char *bdref_key
,
256 BlockDriverState
* parent
,
257 const BdrvChildRole
*child_role
,
258 bool allow_none
, Error
**errp
);
259 void bdrv_set_backing_hd(BlockDriverState
*bs
, BlockDriverState
*backing_hd
,
261 int bdrv_open_backing_file(BlockDriverState
*bs
, QDict
*parent_options
,
262 const char *bdref_key
, Error
**errp
);
263 BlockDriverState
*bdrv_open(const char *filename
, const char *reference
,
264 QDict
*options
, int flags
, Error
**errp
);
265 BlockDriverState
*bdrv_new_open_driver(BlockDriver
*drv
, const char *node_name
,
266 int flags
, Error
**errp
);
267 BlockReopenQueue
*bdrv_reopen_queue(BlockReopenQueue
*bs_queue
,
268 BlockDriverState
*bs
,
269 QDict
*options
, int flags
);
270 int bdrv_reopen_multiple(AioContext
*ctx
, BlockReopenQueue
*bs_queue
, Error
**errp
);
271 int bdrv_reopen(BlockDriverState
*bs
, int bdrv_flags
, Error
**errp
);
272 int bdrv_reopen_prepare(BDRVReopenState
*reopen_state
,
273 BlockReopenQueue
*queue
, Error
**errp
);
274 void bdrv_reopen_commit(BDRVReopenState
*reopen_state
);
275 void bdrv_reopen_abort(BDRVReopenState
*reopen_state
);
276 int bdrv_read(BdrvChild
*child
, int64_t sector_num
,
277 uint8_t *buf
, int nb_sectors
);
278 int bdrv_write(BdrvChild
*child
, int64_t sector_num
,
279 const uint8_t *buf
, int nb_sectors
);
280 int bdrv_pwrite_zeroes(BdrvChild
*child
, int64_t offset
,
281 int bytes
, BdrvRequestFlags flags
);
282 int bdrv_make_zero(BdrvChild
*child
, BdrvRequestFlags flags
);
283 int bdrv_pread(BdrvChild
*child
, int64_t offset
, void *buf
, int bytes
);
284 int bdrv_preadv(BdrvChild
*child
, int64_t offset
, QEMUIOVector
*qiov
);
285 int bdrv_pwrite(BdrvChild
*child
, int64_t offset
, const void *buf
, int bytes
);
286 int bdrv_pwritev(BdrvChild
*child
, int64_t offset
, QEMUIOVector
*qiov
);
287 int bdrv_pwrite_sync(BdrvChild
*child
, int64_t offset
,
288 const void *buf
, int count
);
289 int coroutine_fn
bdrv_co_readv(BdrvChild
*child
, int64_t sector_num
,
290 int nb_sectors
, QEMUIOVector
*qiov
);
291 int coroutine_fn
bdrv_co_writev(BdrvChild
*child
, int64_t sector_num
,
292 int nb_sectors
, QEMUIOVector
*qiov
);
294 * Efficiently zero a region of the disk image. Note that this is a regular
295 * I/O request like read or write and should have a reasonable size. This
296 * function is not suitable for zeroing the entire image in a single request
297 * because it may allocate memory for the entire region.
299 int coroutine_fn
bdrv_co_pwrite_zeroes(BdrvChild
*child
, int64_t offset
,
300 int bytes
, BdrvRequestFlags flags
);
301 BlockDriverState
*bdrv_find_backing_image(BlockDriverState
*bs
,
302 const char *backing_file
);
303 void bdrv_refresh_filename(BlockDriverState
*bs
);
304 int bdrv_truncate(BdrvChild
*child
, int64_t offset
, PreallocMode prealloc
,
306 int64_t bdrv_nb_sectors(BlockDriverState
*bs
);
307 int64_t bdrv_getlength(BlockDriverState
*bs
);
308 int64_t bdrv_get_allocated_file_size(BlockDriverState
*bs
);
309 BlockMeasureInfo
*bdrv_measure(BlockDriver
*drv
, QemuOpts
*opts
,
310 BlockDriverState
*in_bs
, Error
**errp
);
311 void bdrv_get_geometry(BlockDriverState
*bs
, uint64_t *nb_sectors_ptr
);
312 void bdrv_refresh_limits(BlockDriverState
*bs
, Error
**errp
);
313 int bdrv_commit(BlockDriverState
*bs
);
314 int bdrv_change_backing_file(BlockDriverState
*bs
,
315 const char *backing_file
, const char *backing_fmt
);
316 void bdrv_register(BlockDriver
*bdrv
);
317 int bdrv_drop_intermediate(BlockDriverState
*top
, BlockDriverState
*base
,
318 const char *backing_file_str
);
319 BlockDriverState
*bdrv_find_overlay(BlockDriverState
*active
,
320 BlockDriverState
*bs
);
321 BlockDriverState
*bdrv_find_base(BlockDriverState
*bs
);
324 typedef struct BdrvCheckResult
{
328 int corruptions_fixed
;
330 int64_t image_end_offset
;
339 int bdrv_check(BlockDriverState
*bs
, BdrvCheckResult
*res
, BdrvCheckMode fix
);
341 /* The units of offset and total_work_size may be chosen arbitrarily by the
342 * block driver; total_work_size may change during the course of the amendment
344 typedef void BlockDriverAmendStatusCB(BlockDriverState
*bs
, int64_t offset
,
345 int64_t total_work_size
, void *opaque
);
346 int bdrv_amend_options(BlockDriverState
*bs_new
, QemuOpts
*opts
,
347 BlockDriverAmendStatusCB
*status_cb
, void *cb_opaque
);
349 /* external snapshots */
350 bool bdrv_recurse_is_first_non_filter(BlockDriverState
*bs
,
351 BlockDriverState
*candidate
);
352 bool bdrv_is_first_non_filter(BlockDriverState
*candidate
);
354 /* check if a named node can be replaced when doing drive-mirror */
355 BlockDriverState
*check_to_replace_node(BlockDriverState
*parent_bs
,
356 const char *node_name
, Error
**errp
);
358 /* async block I/O */
359 void bdrv_aio_cancel(BlockAIOCB
*acb
);
360 void bdrv_aio_cancel_async(BlockAIOCB
*acb
);
362 /* sg packet commands */
363 int bdrv_co_ioctl(BlockDriverState
*bs
, int req
, void *buf
);
365 /* Invalidate any cached metadata used by image formats */
366 void bdrv_invalidate_cache(BlockDriverState
*bs
, Error
**errp
);
367 void bdrv_invalidate_cache_all(Error
**errp
);
368 int bdrv_inactivate_all(void);
370 /* Ensure contents are flushed to disk. */
371 int bdrv_flush(BlockDriverState
*bs
);
372 int coroutine_fn
bdrv_co_flush(BlockDriverState
*bs
);
373 int bdrv_flush_all(void);
374 void bdrv_close_all(void);
375 void bdrv_drain(BlockDriverState
*bs
);
376 void coroutine_fn
bdrv_co_drain(BlockDriverState
*bs
);
377 void bdrv_drain_all_begin(void);
378 void bdrv_drain_all_end(void);
379 void bdrv_drain_all(void);
381 #define BDRV_POLL_WHILE(bs, cond) ({ \
382 bool waited_ = false; \
384 BlockDriverState *bs_ = (bs); \
385 AioContext *ctx_ = bdrv_get_aio_context(bs_); \
386 if (aio_context_in_iothread(ctx_)) { \
387 while ((cond) || busy_) { \
388 busy_ = aio_poll(ctx_, (cond)); \
389 waited_ |= !!(cond) | busy_; \
392 assert(qemu_get_current_aio_context() == \
393 qemu_get_aio_context()); \
394 /* Ask bdrv_dec_in_flight to wake up the main \
395 * QEMU AioContext. Extra I/O threads never take \
396 * other I/O threads' AioContexts (see for example \
397 * block_job_defer_to_main_loop for how to do it). \
399 assert(!bs_->wakeup); \
400 /* Set bs->wakeup before evaluating cond. */ \
401 atomic_mb_set(&bs_->wakeup, true); \
404 waited_ = busy_ = true; \
405 aio_context_release(ctx_); \
406 aio_poll(qemu_get_aio_context(), true); \
407 aio_context_acquire(ctx_); \
409 busy_ = aio_poll(ctx_, false); \
413 atomic_set(&bs_->wakeup, false); \
417 int bdrv_pdiscard(BlockDriverState
*bs
, int64_t offset
, int bytes
);
418 int bdrv_co_pdiscard(BlockDriverState
*bs
, int64_t offset
, int bytes
);
419 int bdrv_has_zero_init_1(BlockDriverState
*bs
);
420 int bdrv_has_zero_init(BlockDriverState
*bs
);
421 bool bdrv_unallocated_blocks_are_zero(BlockDriverState
*bs
);
422 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState
*bs
);
423 int bdrv_block_status(BlockDriverState
*bs
, int64_t offset
,
424 int64_t bytes
, int64_t *pnum
, int64_t *map
,
425 BlockDriverState
**file
);
426 int bdrv_block_status_above(BlockDriverState
*bs
, BlockDriverState
*base
,
427 int64_t offset
, int64_t bytes
, int64_t *pnum
,
428 int64_t *map
, BlockDriverState
**file
);
429 int bdrv_is_allocated(BlockDriverState
*bs
, int64_t offset
, int64_t bytes
,
431 int bdrv_is_allocated_above(BlockDriverState
*top
, BlockDriverState
*base
,
432 int64_t offset
, int64_t bytes
, int64_t *pnum
);
434 bool bdrv_is_read_only(BlockDriverState
*bs
);
435 int bdrv_can_set_read_only(BlockDriverState
*bs
, bool read_only
,
436 bool ignore_allow_rdw
, Error
**errp
);
437 int bdrv_set_read_only(BlockDriverState
*bs
, bool read_only
, Error
**errp
);
438 bool bdrv_is_sg(BlockDriverState
*bs
);
439 bool bdrv_is_inserted(BlockDriverState
*bs
);
440 void bdrv_lock_medium(BlockDriverState
*bs
, bool locked
);
441 void bdrv_eject(BlockDriverState
*bs
, bool eject_flag
);
442 const char *bdrv_get_format_name(BlockDriverState
*bs
);
443 BlockDriverState
*bdrv_find_node(const char *node_name
);
444 BlockDeviceInfoList
*bdrv_named_nodes_list(Error
**errp
);
445 BlockDriverState
*bdrv_lookup_bs(const char *device
,
446 const char *node_name
,
448 bool bdrv_chain_contains(BlockDriverState
*top
, BlockDriverState
*base
);
449 BlockDriverState
*bdrv_next_node(BlockDriverState
*bs
);
451 typedef struct BdrvNextIterator
{
453 BDRV_NEXT_BACKEND_ROOTS
,
454 BDRV_NEXT_MONITOR_OWNED
,
457 BlockDriverState
*bs
;
460 BlockDriverState
*bdrv_first(BdrvNextIterator
*it
);
461 BlockDriverState
*bdrv_next(BdrvNextIterator
*it
);
462 void bdrv_next_cleanup(BdrvNextIterator
*it
);
464 BlockDriverState
*bdrv_next_monitor_owned(BlockDriverState
*bs
);
465 bool bdrv_is_encrypted(BlockDriverState
*bs
);
466 void bdrv_iterate_format(void (*it
)(void *opaque
, const char *name
),
468 const char *bdrv_get_node_name(const BlockDriverState
*bs
);
469 const char *bdrv_get_device_name(const BlockDriverState
*bs
);
470 const char *bdrv_get_device_or_node_name(const BlockDriverState
*bs
);
471 int bdrv_get_flags(BlockDriverState
*bs
);
472 int bdrv_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
);
473 ImageInfoSpecific
*bdrv_get_specific_info(BlockDriverState
*bs
);
474 void bdrv_round_to_clusters(BlockDriverState
*bs
,
475 int64_t offset
, int64_t bytes
,
476 int64_t *cluster_offset
,
477 int64_t *cluster_bytes
);
479 const char *bdrv_get_encrypted_filename(BlockDriverState
*bs
);
480 void bdrv_get_backing_filename(BlockDriverState
*bs
,
481 char *filename
, int filename_size
);
482 void bdrv_get_full_backing_filename(BlockDriverState
*bs
,
483 char *dest
, size_t sz
, Error
**errp
);
484 void bdrv_get_full_backing_filename_from_filename(const char *backed
,
486 char *dest
, size_t sz
,
489 int path_has_protocol(const char *path
);
490 int path_is_absolute(const char *path
);
491 void path_combine(char *dest
, int dest_size
,
492 const char *base_path
,
493 const char *filename
);
495 int bdrv_readv_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
496 int bdrv_writev_vmstate(BlockDriverState
*bs
, QEMUIOVector
*qiov
, int64_t pos
);
497 int bdrv_save_vmstate(BlockDriverState
*bs
, const uint8_t *buf
,
498 int64_t pos
, int size
);
500 int bdrv_load_vmstate(BlockDriverState
*bs
, uint8_t *buf
,
501 int64_t pos
, int size
);
503 void bdrv_img_create(const char *filename
, const char *fmt
,
504 const char *base_filename
, const char *base_fmt
,
505 char *options
, uint64_t img_size
, int flags
,
506 bool quiet
, Error
**errp
);
508 /* Returns the alignment in bytes that is required so that no bounce buffer
509 * is required throughout the stack */
510 size_t bdrv_min_mem_align(BlockDriverState
*bs
);
511 /* Returns optimal alignment in bytes for bounce buffer */
512 size_t bdrv_opt_mem_align(BlockDriverState
*bs
);
513 void *qemu_blockalign(BlockDriverState
*bs
, size_t size
);
514 void *qemu_blockalign0(BlockDriverState
*bs
, size_t size
);
515 void *qemu_try_blockalign(BlockDriverState
*bs
, size_t size
);
516 void *qemu_try_blockalign0(BlockDriverState
*bs
, size_t size
);
517 bool bdrv_qiov_is_aligned(BlockDriverState
*bs
, QEMUIOVector
*qiov
);
519 void bdrv_enable_copy_on_read(BlockDriverState
*bs
);
520 void bdrv_disable_copy_on_read(BlockDriverState
*bs
);
522 void bdrv_ref(BlockDriverState
*bs
);
523 void bdrv_unref(BlockDriverState
*bs
);
524 void bdrv_unref_child(BlockDriverState
*parent
, BdrvChild
*child
);
525 BdrvChild
*bdrv_attach_child(BlockDriverState
*parent_bs
,
526 BlockDriverState
*child_bs
,
527 const char *child_name
,
528 const BdrvChildRole
*child_role
,
531 bool bdrv_op_is_blocked(BlockDriverState
*bs
, BlockOpType op
, Error
**errp
);
532 void bdrv_op_block(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
533 void bdrv_op_unblock(BlockDriverState
*bs
, BlockOpType op
, Error
*reason
);
534 void bdrv_op_block_all(BlockDriverState
*bs
, Error
*reason
);
535 void bdrv_op_unblock_all(BlockDriverState
*bs
, Error
*reason
);
536 bool bdrv_op_blocker_is_empty(BlockDriverState
*bs
);
538 #define BLKDBG_EVENT(child, evt) \
541 bdrv_debug_event(child->bs, evt); \
545 void bdrv_debug_event(BlockDriverState
*bs
, BlkdebugEvent event
);
547 int bdrv_debug_breakpoint(BlockDriverState
*bs
, const char *event
,
549 int bdrv_debug_remove_breakpoint(BlockDriverState
*bs
, const char *tag
);
550 int bdrv_debug_resume(BlockDriverState
*bs
, const char *tag
);
551 bool bdrv_debug_is_suspended(BlockDriverState
*bs
, const char *tag
);
554 * bdrv_get_aio_context:
556 * Returns: the currently bound #AioContext
558 AioContext
*bdrv_get_aio_context(BlockDriverState
*bs
);
561 * Transfer control to @co in the aio context of @bs
563 void bdrv_coroutine_enter(BlockDriverState
*bs
, Coroutine
*co
);
566 * bdrv_set_aio_context:
568 * Changes the #AioContext used for fd handlers, timers, and BHs by this
569 * BlockDriverState and all its children.
571 * This function must be called with iothread lock held.
573 void bdrv_set_aio_context(BlockDriverState
*bs
, AioContext
*new_context
);
574 int bdrv_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
);
575 int bdrv_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
);
577 void bdrv_io_plug(BlockDriverState
*bs
);
578 void bdrv_io_unplug(BlockDriverState
*bs
);
581 * bdrv_parent_drained_begin:
583 * Begin a quiesced section of all users of @bs. This is part of
584 * bdrv_drained_begin.
586 void bdrv_parent_drained_begin(BlockDriverState
*bs
, BdrvChild
*ignore
);
589 * bdrv_parent_drained_end:
591 * End a quiesced section of all users of @bs. This is part of
594 void bdrv_parent_drained_end(BlockDriverState
*bs
, BdrvChild
*ignore
);
597 * bdrv_drained_begin:
599 * Begin a quiesced section for exclusive access to the BDS, by disabling
600 * external request sources including NBD server and device model. Note that
601 * this doesn't block timers or coroutines from submitting more requests, which
602 * means block_job_pause is still necessary.
604 * This function can be recursive.
606 void bdrv_drained_begin(BlockDriverState
*bs
);
609 * Like bdrv_drained_begin, but recursively begins a quiesced section for
610 * exclusive access to all child nodes as well.
612 void bdrv_subtree_drained_begin(BlockDriverState
*bs
);
617 * End a quiescent section started by bdrv_drained_begin().
619 void bdrv_drained_end(BlockDriverState
*bs
);
622 * End a quiescent section started by bdrv_subtree_drained_begin().
624 void bdrv_subtree_drained_end(BlockDriverState
*bs
);
626 void bdrv_add_child(BlockDriverState
*parent
, BlockDriverState
*child
,
628 void bdrv_del_child(BlockDriverState
*parent
, BdrvChild
*child
, Error
**errp
);
630 bool bdrv_can_store_new_dirty_bitmap(BlockDriverState
*bs
, const char *name
,
631 uint32_t granularity
, Error
**errp
);
634 * bdrv_register_buf/bdrv_unregister_buf:
636 * Register/unregister a buffer for I/O. For example, VFIO drivers are
637 * interested to know the memory areas that would later be used for I/O, so
638 * that they can prepare IOMMU mapping etc., to get better performance.
640 void bdrv_register_buf(BlockDriverState
*bs
, void *host
, size_t size
);
641 void bdrv_unregister_buf(BlockDriverState
*bs
, void *host
);