backup: Use BlockBackend for I/O
[qemu.git] / include / block / block.h
1 #ifndef BLOCK_H
2 #define BLOCK_H
3
4 #include "block/aio.h"
5 #include "qemu/iov.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"
13
14 /* block.c */
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
21 typedef struct BlockDriverInfo {
22 /* in bytes, 0 if irrelevant */
23 int cluster_size;
24 /* offset at which the VM state can be saved (0 if not possible) */
25 int64_t vm_state_offset;
26 bool is_dirty;
27 /*
28 * True if unallocated blocks read back as zeroes. This is equivalent
29 * to the LBPRZ flag in the SCSI logical block provisioning page.
30 */
31 bool unallocated_blocks_are_zero;
32 /*
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.
41 */
42 bool can_write_zeroes_with_unmap;
43 /*
44 * True if this block driver only supports compressed writes
45 */
46 bool needs_compressed_writes;
47 } BlockDriverInfo;
48
49 typedef struct BlockFragInfo {
50 uint64_t allocated_clusters;
51 uint64_t total_clusters;
52 uint64_t fragmented_clusters;
53 uint64_t compressed_clusters;
54 } BlockFragInfo;
55
56 typedef enum {
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.
64 */
65 BDRV_REQ_MAY_UNMAP = 0x4,
66 BDRV_REQ_NO_SERIALISING = 0x8,
67 BDRV_REQ_FUA = 0x10,
68 } BdrvRequestFlags;
69
70 typedef struct BlockSizes {
71 uint32_t phys;
72 uint32_t log;
73 } BlockSizes;
74
75 typedef struct HDGeometry {
76 uint32_t heads;
77 uint32_t sectors;
78 uint32_t cylinders;
79 } HDGeometry;
80
81 #define BDRV_O_RDWR 0x0002
82 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
83 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
84 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
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 */
96 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
97
98 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
99
100
101 /* Option names of options parsed by the block layer */
102
103 #define BDRV_OPT_CACHE_WB "cache.writeback"
104 #define BDRV_OPT_CACHE_DIRECT "cache.direct"
105 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
106
107
108 #define BDRV_SECTOR_BITS 9
109 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
110 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
111
112 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
113 INT_MAX >> BDRV_SECTOR_BITS)
114
115 /*
116 * Allocation status flags
117 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status.
118 * BDRV_BLOCK_ZERO: sectors read as zero
119 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by
120 * bdrv_get_block_status.
121 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
122 * layer (as opposed to the backing file)
123 * BDRV_BLOCK_RAW: used internally to indicate that the request
124 * was answered by the raw driver and that one
125 * should look in bs->file directly.
126 *
127 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
128 * bs->file where sector data can be read from as raw data.
129 *
130 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
131 *
132 * DATA ZERO OFFSET_VALID
133 * t t t sectors read as zero, bs->file is zero at offset
134 * t f t sectors read as valid from bs->file at offset
135 * f t t sectors preallocated, read as zero, bs->file not
136 * necessarily zero at offset
137 * f f t sectors preallocated but read from backing_hd,
138 * bs->file contains garbage at offset
139 * t t f sectors preallocated, read as zero, unknown offset
140 * t f f sectors read from unknown file or offset
141 * f t f not allocated or unknown offset, read as zero
142 * f f f not allocated or unknown offset, read from backing_hd
143 */
144 #define BDRV_BLOCK_DATA 0x01
145 #define BDRV_BLOCK_ZERO 0x02
146 #define BDRV_BLOCK_OFFSET_VALID 0x04
147 #define BDRV_BLOCK_RAW 0x08
148 #define BDRV_BLOCK_ALLOCATED 0x10
149 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
150
151 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
152
153 typedef struct BDRVReopenState {
154 BlockDriverState *bs;
155 int flags;
156 QDict *options;
157 QDict *explicit_options;
158 void *opaque;
159 } BDRVReopenState;
160
161 /*
162 * Block operation types
163 */
164 typedef enum BlockOpType {
165 BLOCK_OP_TYPE_BACKUP_SOURCE,
166 BLOCK_OP_TYPE_BACKUP_TARGET,
167 BLOCK_OP_TYPE_CHANGE,
168 BLOCK_OP_TYPE_COMMIT_SOURCE,
169 BLOCK_OP_TYPE_COMMIT_TARGET,
170 BLOCK_OP_TYPE_DATAPLANE,
171 BLOCK_OP_TYPE_DRIVE_DEL,
172 BLOCK_OP_TYPE_EJECT,
173 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
174 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
175 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
176 BLOCK_OP_TYPE_MIRROR_SOURCE,
177 BLOCK_OP_TYPE_MIRROR_TARGET,
178 BLOCK_OP_TYPE_RESIZE,
179 BLOCK_OP_TYPE_STREAM,
180 BLOCK_OP_TYPE_REPLACE,
181 BLOCK_OP_TYPE_MAX,
182 } BlockOpType;
183
184 void bdrv_info_print(Monitor *mon, const QObject *data);
185 void bdrv_info(Monitor *mon, QObject **ret_data);
186 void bdrv_stats_print(Monitor *mon, const QObject *data);
187 void bdrv_info_stats(Monitor *mon, QObject **ret_data);
188
189 /* disk I/O throttling */
190 void bdrv_init(void);
191 void bdrv_init_with_whitelist(void);
192 bool bdrv_uses_whitelist(void);
193 BlockDriver *bdrv_find_protocol(const char *filename,
194 bool allow_protocol_prefix,
195 Error **errp);
196 BlockDriver *bdrv_find_format(const char *format_name);
197 int bdrv_create(BlockDriver *drv, const char* filename,
198 QemuOpts *opts, Error **errp);
199 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
200 BlockDriverState *bdrv_new(void);
201 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
202 void bdrv_replace_in_backing_chain(BlockDriverState *old,
203 BlockDriverState *new);
204
205 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough);
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 BlockDriverState *bdrv_open(const char *filename, const char *reference,
216 QDict *options, int flags, Error **errp);
217 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
218 BlockDriverState *bs,
219 QDict *options, int flags);
220 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
221 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
222 int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
223 BlockReopenQueue *queue, Error **errp);
224 void bdrv_reopen_commit(BDRVReopenState *reopen_state);
225 void bdrv_reopen_abort(BDRVReopenState *reopen_state);
226 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
227 uint8_t *buf, int nb_sectors);
228 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
229 const uint8_t *buf, int nb_sectors);
230 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
231 int nb_sectors, BdrvRequestFlags flags);
232 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
233 int nb_sectors, BdrvRequestFlags flags,
234 BlockCompletionFunc *cb, void *opaque);
235 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
236 int bdrv_pread(BlockDriverState *bs, int64_t offset,
237 void *buf, int count);
238 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
239 const void *buf, int count);
240 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
241 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
242 const void *buf, int count);
243 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
244 int nb_sectors, QEMUIOVector *qiov);
245 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
246 int nb_sectors, QEMUIOVector *qiov);
247 /*
248 * Efficiently zero a region of the disk image. Note that this is a regular
249 * I/O request like read or write and should have a reasonable size. This
250 * function is not suitable for zeroing the entire image in a single request
251 * because it may allocate memory for the entire region.
252 */
253 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
254 int nb_sectors, BdrvRequestFlags flags);
255 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
256 const char *backing_file);
257 int bdrv_get_backing_file_depth(BlockDriverState *bs);
258 void bdrv_refresh_filename(BlockDriverState *bs);
259 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
260 int64_t bdrv_nb_sectors(BlockDriverState *bs);
261 int64_t bdrv_getlength(BlockDriverState *bs);
262 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
263 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
264 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
265 int bdrv_commit(BlockDriverState *bs);
266 int bdrv_change_backing_file(BlockDriverState *bs,
267 const char *backing_file, const char *backing_fmt);
268 void bdrv_register(BlockDriver *bdrv);
269 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
270 BlockDriverState *base,
271 const char *backing_file_str);
272 BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
273 BlockDriverState *bs);
274 BlockDriverState *bdrv_find_base(BlockDriverState *bs);
275
276
277 typedef struct BdrvCheckResult {
278 int corruptions;
279 int leaks;
280 int check_errors;
281 int corruptions_fixed;
282 int leaks_fixed;
283 int64_t image_end_offset;
284 BlockFragInfo bfi;
285 } BdrvCheckResult;
286
287 typedef enum {
288 BDRV_FIX_LEAKS = 1,
289 BDRV_FIX_ERRORS = 2,
290 } BdrvCheckMode;
291
292 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
293
294 /* The units of offset and total_work_size may be chosen arbitrarily by the
295 * block driver; total_work_size may change during the course of the amendment
296 * operation */
297 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
298 int64_t total_work_size, void *opaque);
299 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
300 BlockDriverAmendStatusCB *status_cb, void *cb_opaque);
301
302 /* external snapshots */
303 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
304 BlockDriverState *candidate);
305 bool bdrv_is_first_non_filter(BlockDriverState *candidate);
306
307 /* check if a named node can be replaced when doing drive-mirror */
308 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
309 const char *node_name, Error **errp);
310
311 /* async block I/O */
312 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
313 QEMUIOVector *iov, int nb_sectors,
314 BlockCompletionFunc *cb, void *opaque);
315 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
316 QEMUIOVector *iov, int nb_sectors,
317 BlockCompletionFunc *cb, void *opaque);
318 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
319 BlockCompletionFunc *cb, void *opaque);
320 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
321 int64_t sector_num, int nb_sectors,
322 BlockCompletionFunc *cb, void *opaque);
323 void bdrv_aio_cancel(BlockAIOCB *acb);
324 void bdrv_aio_cancel_async(BlockAIOCB *acb);
325
326 typedef struct BlockRequest {
327 /* Fields to be filled by caller */
328 union {
329 struct {
330 int64_t sector;
331 int nb_sectors;
332 int flags;
333 QEMUIOVector *qiov;
334 };
335 struct {
336 int req;
337 void *buf;
338 };
339 };
340 BlockCompletionFunc *cb;
341 void *opaque;
342
343 /* Filled by block layer */
344 int error;
345 } BlockRequest;
346
347 /* sg packet commands */
348 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
349 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
350 unsigned long int req, void *buf,
351 BlockCompletionFunc *cb, void *opaque);
352
353 /* Invalidate any cached metadata used by image formats */
354 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
355 void bdrv_invalidate_cache_all(Error **errp);
356 int bdrv_inactivate_all(void);
357
358 /* Ensure contents are flushed to disk. */
359 int bdrv_flush(BlockDriverState *bs);
360 int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
361 void bdrv_close_all(void);
362 void bdrv_drain(BlockDriverState *bs);
363 void coroutine_fn bdrv_co_drain(BlockDriverState *bs);
364 void bdrv_drain_all(void);
365
366 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
367 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
368 int bdrv_has_zero_init_1(BlockDriverState *bs);
369 int bdrv_has_zero_init(BlockDriverState *bs);
370 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
371 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
372 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
373 int nb_sectors, int *pnum,
374 BlockDriverState **file);
375 int64_t bdrv_get_block_status_above(BlockDriverState *bs,
376 BlockDriverState *base,
377 int64_t sector_num,
378 int nb_sectors, int *pnum,
379 BlockDriverState **file);
380 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
381 int *pnum);
382 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
383 int64_t sector_num, int nb_sectors, int *pnum);
384
385 int bdrv_is_read_only(BlockDriverState *bs);
386 int bdrv_is_sg(BlockDriverState *bs);
387 bool bdrv_is_inserted(BlockDriverState *bs);
388 int bdrv_media_changed(BlockDriverState *bs);
389 void bdrv_lock_medium(BlockDriverState *bs, bool locked);
390 void bdrv_eject(BlockDriverState *bs, bool eject_flag);
391 const char *bdrv_get_format_name(BlockDriverState *bs);
392 BlockDriverState *bdrv_find_node(const char *node_name);
393 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp);
394 BlockDriverState *bdrv_lookup_bs(const char *device,
395 const char *node_name,
396 Error **errp);
397 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
398 BlockDriverState *bdrv_next_node(BlockDriverState *bs);
399
400 typedef struct BdrvNextIterator {
401 enum {
402 BDRV_NEXT_BACKEND_ROOTS,
403 BDRV_NEXT_MONITOR_OWNED,
404 } phase;
405 BlockBackend *blk;
406 BlockDriverState *bs;
407 } BdrvNextIterator;
408
409 BlockDriverState *bdrv_first(BdrvNextIterator *it);
410 BlockDriverState *bdrv_next(BdrvNextIterator *it);
411
412 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs);
413 int bdrv_is_encrypted(BlockDriverState *bs);
414 int bdrv_key_required(BlockDriverState *bs);
415 int bdrv_set_key(BlockDriverState *bs, const char *key);
416 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
417 int bdrv_query_missing_keys(void);
418 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
419 void *opaque);
420 const char *bdrv_get_node_name(const BlockDriverState *bs);
421 const char *bdrv_get_device_name(const BlockDriverState *bs);
422 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs);
423 int bdrv_get_flags(BlockDriverState *bs);
424 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
425 const uint8_t *buf, int nb_sectors);
426 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
427 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
428 void bdrv_round_to_clusters(BlockDriverState *bs,
429 int64_t sector_num, int nb_sectors,
430 int64_t *cluster_sector_num,
431 int *cluster_nb_sectors);
432
433 const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
434 void bdrv_get_backing_filename(BlockDriverState *bs,
435 char *filename, int filename_size);
436 void bdrv_get_full_backing_filename(BlockDriverState *bs,
437 char *dest, size_t sz, Error **errp);
438 void bdrv_get_full_backing_filename_from_filename(const char *backed,
439 const char *backing,
440 char *dest, size_t sz,
441 Error **errp);
442 int bdrv_is_snapshot(BlockDriverState *bs);
443
444 int path_has_protocol(const char *path);
445 int path_is_absolute(const char *path);
446 void path_combine(char *dest, int dest_size,
447 const char *base_path,
448 const char *filename);
449
450 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
451 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
452 int64_t pos, int size);
453
454 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
455 int64_t pos, int size);
456
457 void bdrv_img_create(const char *filename, const char *fmt,
458 const char *base_filename, const char *base_fmt,
459 char *options, uint64_t img_size, int flags,
460 Error **errp, bool quiet);
461
462 /* Returns the alignment in bytes that is required so that no bounce buffer
463 * is required throughout the stack */
464 size_t bdrv_min_mem_align(BlockDriverState *bs);
465 /* Returns optimal alignment in bytes for bounce buffer */
466 size_t bdrv_opt_mem_align(BlockDriverState *bs);
467 void *qemu_blockalign(BlockDriverState *bs, size_t size);
468 void *qemu_blockalign0(BlockDriverState *bs, size_t size);
469 void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
470 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
471 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
472
473 void bdrv_enable_copy_on_read(BlockDriverState *bs);
474 void bdrv_disable_copy_on_read(BlockDriverState *bs);
475
476 void bdrv_ref(BlockDriverState *bs);
477 void bdrv_unref(BlockDriverState *bs);
478 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child);
479 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
480 BlockDriverState *child_bs,
481 const char *child_name,
482 const BdrvChildRole *child_role);
483
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);
490
491 #define BLKDBG_EVENT(child, evt) \
492 do { \
493 if (child) { \
494 bdrv_debug_event(child->bs, evt); \
495 } \
496 } while (0)
497
498 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event);
499
500 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event,
501 const char *tag);
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);
505
506 /**
507 * bdrv_get_aio_context:
508 *
509 * Returns: the currently bound #AioContext
510 */
511 AioContext *bdrv_get_aio_context(BlockDriverState *bs);
512
513 /**
514 * bdrv_set_aio_context:
515 *
516 * Changes the #AioContext used for fd handlers, timers, and BHs by this
517 * BlockDriverState and all its children.
518 *
519 * This function must be called with iothread lock held.
520 */
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);
524
525 void bdrv_io_plug(BlockDriverState *bs);
526 void bdrv_io_unplug(BlockDriverState *bs);
527 void bdrv_io_unplugged_begin(BlockDriverState *bs);
528 void bdrv_io_unplugged_end(BlockDriverState *bs);
529
530 /**
531 * bdrv_drained_begin:
532 *
533 * Begin a quiesced section for exclusive access to the BDS, by disabling
534 * external request sources including NBD server and device model. Note that
535 * this doesn't block timers or coroutines from submitting more requests, which
536 * means block_job_pause is still necessary.
537 *
538 * This function can be recursive.
539 */
540 void bdrv_drained_begin(BlockDriverState *bs);
541
542 /**
543 * bdrv_drained_end:
544 *
545 * End a quiescent section started by bdrv_drained_begin().
546 */
547 void bdrv_drained_end(BlockDriverState *bs);
548
549 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child,
550 Error **errp);
551 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp);
552
553 #endif