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_make_anon(BlockDriverState *bs); 205 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 206 void bdrv_replace_in_backing_chain(BlockDriverState *old, 207 BlockDriverState *new); 208 209 int bdrv_parse_cache_flags(const char *mode, int *flags); 210 int bdrv_parse_discard_flags(const char *mode, int *flags); 211 BdrvChild *bdrv_open_child(const char *filename, 212 QDict *options, const char *bdref_key, 213 BlockDriverState* parent, 214 const BdrvChildRole *child_role, 215 bool allow_none, Error **errp); 216 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 217 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 218 const char *bdref_key, Error **errp); 219 int bdrv_open(BlockDriverState **pbs, const char *filename, 220 const char *reference, QDict *options, int flags, Error **errp); 221 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 222 BlockDriverState *bs, 223 QDict *options, int flags); 224 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 225 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 226 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 227 BlockReopenQueue *queue, Error **errp); 228 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 229 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 230 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 231 uint8_t *buf, int nb_sectors); 232 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 233 const uint8_t *buf, int nb_sectors); 234 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 235 int nb_sectors, BdrvRequestFlags flags); 236 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 237 int nb_sectors, BdrvRequestFlags flags, 238 BlockCompletionFunc *cb, void *opaque); 239 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 240 int bdrv_pread(BlockDriverState *bs, int64_t offset, 241 void *buf, int count); 242 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 243 const void *buf, int count); 244 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 245 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 246 const void *buf, int count); 247 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 248 int nb_sectors, QEMUIOVector *qiov); 249 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 250 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 251 int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs, 252 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 253 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 254 int nb_sectors, QEMUIOVector *qiov); 255 /* 256 * Efficiently zero a region of the disk image. Note that this is a regular 257 * I/O request like read or write and should have a reasonable size. This 258 * function is not suitable for zeroing the entire image in a single request 259 * because it may allocate memory for the entire region. 260 */ 261 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 262 int nb_sectors, BdrvRequestFlags flags); 263 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 264 const char *backing_file); 265 int bdrv_get_backing_file_depth(BlockDriverState *bs); 266 void bdrv_refresh_filename(BlockDriverState *bs); 267 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 268 int64_t bdrv_nb_sectors(BlockDriverState *bs); 269 int64_t bdrv_getlength(BlockDriverState *bs); 270 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 271 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 272 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 273 int bdrv_commit(BlockDriverState *bs); 274 int bdrv_change_backing_file(BlockDriverState *bs, 275 const char *backing_file, const char *backing_fmt); 276 void bdrv_register(BlockDriver *bdrv); 277 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 278 BlockDriverState *base, 279 const char *backing_file_str); 280 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 281 BlockDriverState *bs); 282 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 283 284 285 typedef struct BdrvCheckResult { 286 int corruptions; 287 int leaks; 288 int check_errors; 289 int corruptions_fixed; 290 int leaks_fixed; 291 int64_t image_end_offset; 292 BlockFragInfo bfi; 293 } BdrvCheckResult; 294 295 typedef enum { 296 BDRV_FIX_LEAKS = 1, 297 BDRV_FIX_ERRORS = 2, 298 } BdrvCheckMode; 299 300 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 301 302 /* The units of offset and total_work_size may be chosen arbitrarily by the 303 * block driver; total_work_size may change during the course of the amendment 304 * operation */ 305 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 306 int64_t total_work_size, void *opaque); 307 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 308 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 309 310 /* external snapshots */ 311 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 312 BlockDriverState *candidate); 313 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 314 315 /* check if a named node can be replaced when doing drive-mirror */ 316 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 317 const char *node_name, Error **errp); 318 319 /* async block I/O */ 320 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 321 QEMUIOVector *iov, int nb_sectors, 322 BlockCompletionFunc *cb, void *opaque); 323 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 324 QEMUIOVector *iov, int nb_sectors, 325 BlockCompletionFunc *cb, void *opaque); 326 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 327 BlockCompletionFunc *cb, void *opaque); 328 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 329 int64_t sector_num, int nb_sectors, 330 BlockCompletionFunc *cb, void *opaque); 331 void bdrv_aio_cancel(BlockAIOCB *acb); 332 void bdrv_aio_cancel_async(BlockAIOCB *acb); 333 334 typedef struct BlockRequest { 335 /* Fields to be filled by multiwrite caller */ 336 union { 337 struct { 338 int64_t sector; 339 int nb_sectors; 340 int flags; 341 QEMUIOVector *qiov; 342 }; 343 struct { 344 int req; 345 void *buf; 346 }; 347 }; 348 BlockCompletionFunc *cb; 349 void *opaque; 350 351 /* Filled by multiwrite implementation */ 352 int error; 353 } BlockRequest; 354 355 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 356 int num_reqs); 357 358 /* sg packet commands */ 359 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 360 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 361 unsigned long int req, void *buf, 362 BlockCompletionFunc *cb, void *opaque); 363 364 /* Invalidate any cached metadata used by image formats */ 365 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 366 void bdrv_invalidate_cache_all(Error **errp); 367 int bdrv_inactivate_all(void); 368 369 /* Ensure contents are flushed to disk. */ 370 int bdrv_flush(BlockDriverState *bs); 371 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 372 void bdrv_close_all(void); 373 void bdrv_drain(BlockDriverState *bs); 374 void bdrv_drain_all(void); 375 376 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 377 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 378 int bdrv_has_zero_init_1(BlockDriverState *bs); 379 int bdrv_has_zero_init(BlockDriverState *bs); 380 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 381 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 382 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 383 int nb_sectors, int *pnum, 384 BlockDriverState **file); 385 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 386 BlockDriverState *base, 387 int64_t sector_num, 388 int nb_sectors, int *pnum, 389 BlockDriverState **file); 390 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 391 int *pnum); 392 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 393 int64_t sector_num, int nb_sectors, int *pnum); 394 395 int bdrv_is_read_only(BlockDriverState *bs); 396 int bdrv_is_sg(BlockDriverState *bs); 397 int bdrv_enable_write_cache(BlockDriverState *bs); 398 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); 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