1 #ifndef BLOCK_H 2 #define BLOCK_H 3 4 #include "block/aio.h" 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" 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 } BdrvRequestFlags; 68 69 typedef struct BlockSizes { 70 uint32_t phys; 71 uint32_t log; 72 } BlockSizes; 73 74 typedef struct HDGeometry { 75 uint32_t heads; 76 uint32_t sectors; 77 uint32_t cylinders; 78 } HDGeometry; 79 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 */ 96 97 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH) 98 99 100 /* Option names of options parsed by the block layer */ 101 102 #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" 105 106 107 #define BDRV_SECTOR_BITS 9 108 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 109 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 110 111 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 112 INT_MAX >> BDRV_SECTOR_BITS) 113 114 /* 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. 125 * 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. 128 * 129 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 130 * 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 142 */ 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 149 150 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 151 152 typedef struct BDRVReopenState { 153 BlockDriverState *bs; 154 int flags; 155 QDict *options; 156 QDict *explicit_options; 157 void *opaque; 158 } BDRVReopenState; 159 160 /* 161 * Block operation types 162 */ 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, 171 BLOCK_OP_TYPE_EJECT, 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, 180 BLOCK_OP_TYPE_MAX, 181 } BlockOpType; 182 183 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); 187 188 /* 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); 192 193 void bdrv_init(void); 194 void bdrv_init_with_whitelist(void); 195 BlockDriver *bdrv_find_protocol(const char *filename, 196 bool allow_protocol_prefix, 197 Error **errp); 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); 209 210 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); 258 /* 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. 263 */ 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); 287 288 289 typedef struct BdrvCheckResult { 290 int corruptions; 291 int leaks; 292 int check_errors; 293 int corruptions_fixed; 294 int leaks_fixed; 295 int64_t image_end_offset; 296 BlockFragInfo bfi; 297 } BdrvCheckResult; 298 299 typedef enum { 300 BDRV_FIX_LEAKS = 1, 301 BDRV_FIX_ERRORS = 2, 302 } BdrvCheckMode; 303 304 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 305 306 /* 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 308 * operation */ 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); 313 314 /* external snapshots */ 315 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 316 BlockDriverState *candidate); 317 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 318 319 /* 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); 322 323 /* 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); 337 338 typedef struct BlockRequest { 339 /* Fields to be filled by multiwrite caller */ 340 union { 341 struct { 342 int64_t sector; 343 int nb_sectors; 344 int flags; 345 QEMUIOVector *qiov; 346 }; 347 struct { 348 int req; 349 void *buf; 350 }; 351 }; 352 BlockCompletionFunc *cb; 353 void *opaque; 354 355 /* Filled by multiwrite implementation */ 356 int error; 357 } BlockRequest; 358 359 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 360 int num_reqs); 361 362 /* 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); 367 368 /* 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); 372 373 /* 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); 380 381 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, 392 int64_t sector_num, 393 int nb_sectors, int *pnum, 394 BlockDriverState **file); 395 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 396 int *pnum); 397 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 398 int64_t sector_num, int nb_sectors, int *pnum); 399 400 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, 413 Error **errp); 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), 423 void *opaque); 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); 436 437 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, 443 const char *backing, 444 char *dest, size_t sz, 445 Error **errp); 446 int bdrv_is_snapshot(BlockDriverState *bs); 447 448 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); 453 454 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); 457 458 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 459 int64_t pos, int size); 460 461 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); 465 466 /* 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); 476 477 void bdrv_enable_copy_on_read(BlockDriverState *bs); 478 void bdrv_disable_copy_on_read(BlockDriverState *bs); 479 480 void bdrv_ref(BlockDriverState *bs); 481 void bdrv_unref(BlockDriverState *bs); 482 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 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_flush_io_queue(BlockDriverState *bs); 528 529 /** 530 * bdrv_drained_begin: 531 * 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. 536 * 537 * This function can be recursive. 538 */ 539 void bdrv_drained_begin(BlockDriverState *bs); 540 541 /** 542 * bdrv_drained_end: 543 * 544 * End a quiescent section started by bdrv_drained_begin(). 545 */ 546 void bdrv_drained_end(BlockDriverState *bs); 547 548 #endif 549