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_io_limits_enable(BlockDriverState *bs, const char *group); 191 void bdrv_io_limits_disable(BlockDriverState *bs); 192 void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group); 193 194 void bdrv_init(void); 195 void bdrv_init_with_whitelist(void); 196 bool bdrv_uses_whitelist(void); 197 BlockDriver *bdrv_find_protocol(const char *filename, 198 bool allow_protocol_prefix, 199 Error **errp); 200 BlockDriver *bdrv_find_format(const char *format_name); 201 int bdrv_create(BlockDriver *drv, const char* filename, 202 QemuOpts *opts, Error **errp); 203 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 204 BlockDriverState *bdrv_new_root(void); 205 BlockDriverState *bdrv_new(void); 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_mode(const char *mode, int *flags, bool *writethrough); 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_write(BlockDriverState *bs, int64_t sector_num, 234 const uint8_t *buf, int nb_sectors); 235 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 236 int nb_sectors, BdrvRequestFlags flags); 237 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 238 int nb_sectors, BdrvRequestFlags flags, 239 BlockCompletionFunc *cb, void *opaque); 240 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 241 int bdrv_pread(BlockDriverState *bs, int64_t offset, 242 void *buf, int count); 243 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 244 const void *buf, int count); 245 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 246 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 247 const void *buf, int count); 248 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 249 int nb_sectors, QEMUIOVector *qiov); 250 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 251 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 252 int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs, 253 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 254 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 255 int nb_sectors, QEMUIOVector *qiov); 256 /* 257 * Efficiently zero a region of the disk image. Note that this is a regular 258 * I/O request like read or write and should have a reasonable size. This 259 * function is not suitable for zeroing the entire image in a single request 260 * because it may allocate memory for the entire region. 261 */ 262 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 263 int nb_sectors, BdrvRequestFlags flags); 264 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 265 const char *backing_file); 266 int bdrv_get_backing_file_depth(BlockDriverState *bs); 267 void bdrv_refresh_filename(BlockDriverState *bs); 268 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 269 int64_t bdrv_nb_sectors(BlockDriverState *bs); 270 int64_t bdrv_getlength(BlockDriverState *bs); 271 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 272 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 273 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 274 int bdrv_commit(BlockDriverState *bs); 275 int bdrv_change_backing_file(BlockDriverState *bs, 276 const char *backing_file, const char *backing_fmt); 277 void bdrv_register(BlockDriver *bdrv); 278 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 279 BlockDriverState *base, 280 const char *backing_file_str); 281 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 282 BlockDriverState *bs); 283 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 284 285 286 typedef struct BdrvCheckResult { 287 int corruptions; 288 int leaks; 289 int check_errors; 290 int corruptions_fixed; 291 int leaks_fixed; 292 int64_t image_end_offset; 293 BlockFragInfo bfi; 294 } BdrvCheckResult; 295 296 typedef enum { 297 BDRV_FIX_LEAKS = 1, 298 BDRV_FIX_ERRORS = 2, 299 } BdrvCheckMode; 300 301 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 302 303 /* The units of offset and total_work_size may be chosen arbitrarily by the 304 * block driver; total_work_size may change during the course of the amendment 305 * operation */ 306 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 307 int64_t total_work_size, void *opaque); 308 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 309 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 310 311 /* external snapshots */ 312 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 313 BlockDriverState *candidate); 314 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 315 316 /* check if a named node can be replaced when doing drive-mirror */ 317 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 318 const char *node_name, Error **errp); 319 320 /* async block I/O */ 321 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 322 QEMUIOVector *iov, int nb_sectors, 323 BlockCompletionFunc *cb, void *opaque); 324 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 325 QEMUIOVector *iov, int nb_sectors, 326 BlockCompletionFunc *cb, void *opaque); 327 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 328 BlockCompletionFunc *cb, void *opaque); 329 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 330 int64_t sector_num, int nb_sectors, 331 BlockCompletionFunc *cb, void *opaque); 332 void bdrv_aio_cancel(BlockAIOCB *acb); 333 void bdrv_aio_cancel_async(BlockAIOCB *acb); 334 335 typedef struct BlockRequest { 336 /* Fields to be filled by multiwrite caller */ 337 union { 338 struct { 339 int64_t sector; 340 int nb_sectors; 341 int flags; 342 QEMUIOVector *qiov; 343 }; 344 struct { 345 int req; 346 void *buf; 347 }; 348 }; 349 BlockCompletionFunc *cb; 350 void *opaque; 351 352 /* Filled by multiwrite implementation */ 353 int error; 354 } BlockRequest; 355 356 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 357 int num_reqs); 358 359 /* sg packet commands */ 360 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 361 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 362 unsigned long int req, void *buf, 363 BlockCompletionFunc *cb, void *opaque); 364 365 /* 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); 369 370 /* Ensure contents are flushed to disk. */ 371 int bdrv_flush(BlockDriverState *bs); 372 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 373 void bdrv_close_all(void); 374 void bdrv_drain(BlockDriverState *bs); 375 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 376 void bdrv_drain_all(void); 377 378 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 379 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 380 int bdrv_has_zero_init_1(BlockDriverState *bs); 381 int bdrv_has_zero_init(BlockDriverState *bs); 382 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 383 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 384 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 385 int nb_sectors, int *pnum, 386 BlockDriverState **file); 387 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 388 BlockDriverState *base, 389 int64_t sector_num, 390 int nb_sectors, int *pnum, 391 BlockDriverState **file); 392 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 393 int *pnum); 394 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 395 int64_t sector_num, int nb_sectors, int *pnum); 396 397 int bdrv_is_read_only(BlockDriverState *bs); 398 int bdrv_is_sg(BlockDriverState *bs); 399 bool bdrv_is_inserted(BlockDriverState *bs); 400 int bdrv_media_changed(BlockDriverState *bs); 401 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 402 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 403 const char *bdrv_get_format_name(BlockDriverState *bs); 404 BlockDriverState *bdrv_find_node(const char *node_name); 405 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 406 BlockDriverState *bdrv_lookup_bs(const char *device, 407 const char *node_name, 408 Error **errp); 409 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 410 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 411 BlockDriverState *bdrv_next(BlockDriverState *bs); 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); 479 480 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 481 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 482 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 483 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 484 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 485 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 486 487 #define BLKDBG_EVENT(child, evt) \ 488 do { \ 489 if (child) { \ 490 bdrv_debug_event(child->bs, evt); \ 491 } \ 492 } while (0) 493 494 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 495 496 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 497 const char *tag); 498 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 499 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 500 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 501 502 /** 503 * bdrv_get_aio_context: 504 * 505 * Returns: the currently bound #AioContext 506 */ 507 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 508 509 /** 510 * bdrv_set_aio_context: 511 * 512 * Changes the #AioContext used for fd handlers, timers, and BHs by this 513 * BlockDriverState and all its children. 514 * 515 * This function must be called with iothread lock held. 516 */ 517 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 518 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 519 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 520 521 void bdrv_io_plug(BlockDriverState *bs); 522 void bdrv_io_unplug(BlockDriverState *bs); 523 void bdrv_flush_io_queue(BlockDriverState *bs); 524 525 /** 526 * bdrv_drained_begin: 527 * 528 * Begin a quiesced section for exclusive access to the BDS, by disabling 529 * external request sources including NBD server and device model. Note that 530 * this doesn't block timers or coroutines from submitting more requests, which 531 * means block_job_pause is still necessary. 532 * 533 * This function can be recursive. 534 */ 535 void bdrv_drained_begin(BlockDriverState *bs); 536 537 /** 538 * bdrv_drained_end: 539 * 540 * End a quiescent section started by bdrv_drained_begin(). 541 */ 542 void bdrv_drained_end(BlockDriverState *bs); 543 544 #endif 545