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 typedef struct BdrvNextIterator BdrvNextIterator; 21 22 typedef struct BlockDriverInfo { 23 /* in bytes, 0 if irrelevant */ 24 int cluster_size; 25 /* offset at which the VM state can be saved (0 if not possible) */ 26 int64_t vm_state_offset; 27 bool is_dirty; 28 /* 29 * True if unallocated blocks read back as zeroes. This is equivalent 30 * to the LBPRZ flag in the SCSI logical block provisioning page. 31 */ 32 bool unallocated_blocks_are_zero; 33 /* 34 * True if the driver can optimize writing zeroes by unmapping 35 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 36 * with the difference that in qemu a discard is allowed to silently 37 * fail. Therefore we have to use bdrv_write_zeroes with the 38 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 39 * After this call the driver has to guarantee that the contents read 40 * back as zero. It is additionally required that the block device is 41 * opened with BDRV_O_UNMAP flag for this to work. 42 */ 43 bool can_write_zeroes_with_unmap; 44 /* 45 * True if this block driver only supports compressed writes 46 */ 47 bool needs_compressed_writes; 48 } BlockDriverInfo; 49 50 typedef struct BlockFragInfo { 51 uint64_t allocated_clusters; 52 uint64_t total_clusters; 53 uint64_t fragmented_clusters; 54 uint64_t compressed_clusters; 55 } BlockFragInfo; 56 57 typedef enum { 58 BDRV_REQ_COPY_ON_READ = 0x1, 59 BDRV_REQ_ZERO_WRITE = 0x2, 60 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 61 * is allowed to optimize a write zeroes request by unmapping (discarding) 62 * blocks if it is guaranteed that the result will read back as 63 * zeroes. The flag is only passed to the driver if the block device is 64 * opened with BDRV_O_UNMAP. 65 */ 66 BDRV_REQ_MAY_UNMAP = 0x4, 67 BDRV_REQ_NO_SERIALISING = 0x8, 68 BDRV_REQ_FUA = 0x10, 69 } BdrvRequestFlags; 70 71 typedef struct BlockSizes { 72 uint32_t phys; 73 uint32_t log; 74 } BlockSizes; 75 76 typedef struct HDGeometry { 77 uint32_t heads; 78 uint32_t sectors; 79 uint32_t cylinders; 80 } HDGeometry; 81 82 #define BDRV_O_RDWR 0x0002 83 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 84 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 85 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 86 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 87 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 88 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 89 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 90 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 91 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 92 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 93 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 94 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 95 select an appropriate protocol driver, 96 ignoring the format layer */ 97 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ 98 99 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) 100 101 102 /* Option names of options parsed by the block layer */ 103 104 #define BDRV_OPT_CACHE_WB "cache.writeback" 105 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 106 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 107 108 109 #define BDRV_SECTOR_BITS 9 110 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 111 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 112 113 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 114 INT_MAX >> BDRV_SECTOR_BITS) 115 116 /* 117 * Allocation status flags 118 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status. 119 * BDRV_BLOCK_ZERO: sectors read as zero 120 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by 121 * bdrv_get_block_status. 122 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 123 * layer (as opposed to the backing file) 124 * BDRV_BLOCK_RAW: used internally to indicate that the request 125 * was answered by the raw driver and that one 126 * should look in bs->file directly. 127 * 128 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 129 * bs->file where sector data can be read from as raw data. 130 * 131 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 132 * 133 * DATA ZERO OFFSET_VALID 134 * t t t sectors read as zero, bs->file is zero at offset 135 * t f t sectors read as valid from bs->file at offset 136 * f t t sectors preallocated, read as zero, bs->file not 137 * necessarily zero at offset 138 * f f t sectors preallocated but read from backing_hd, 139 * bs->file contains garbage at offset 140 * t t f sectors preallocated, read as zero, unknown offset 141 * t f f sectors read from unknown file or offset 142 * f t f not allocated or unknown offset, read as zero 143 * f f f not allocated or unknown offset, read from backing_hd 144 */ 145 #define BDRV_BLOCK_DATA 0x01 146 #define BDRV_BLOCK_ZERO 0x02 147 #define BDRV_BLOCK_OFFSET_VALID 0x04 148 #define BDRV_BLOCK_RAW 0x08 149 #define BDRV_BLOCK_ALLOCATED 0x10 150 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 151 152 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 153 154 typedef struct BDRVReopenState { 155 BlockDriverState *bs; 156 int flags; 157 QDict *options; 158 QDict *explicit_options; 159 void *opaque; 160 } BDRVReopenState; 161 162 /* 163 * Block operation types 164 */ 165 typedef enum BlockOpType { 166 BLOCK_OP_TYPE_BACKUP_SOURCE, 167 BLOCK_OP_TYPE_BACKUP_TARGET, 168 BLOCK_OP_TYPE_CHANGE, 169 BLOCK_OP_TYPE_COMMIT_SOURCE, 170 BLOCK_OP_TYPE_COMMIT_TARGET, 171 BLOCK_OP_TYPE_DATAPLANE, 172 BLOCK_OP_TYPE_DRIVE_DEL, 173 BLOCK_OP_TYPE_EJECT, 174 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 175 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 176 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 177 BLOCK_OP_TYPE_MIRROR_SOURCE, 178 BLOCK_OP_TYPE_MIRROR_TARGET, 179 BLOCK_OP_TYPE_RESIZE, 180 BLOCK_OP_TYPE_STREAM, 181 BLOCK_OP_TYPE_REPLACE, 182 BLOCK_OP_TYPE_MAX, 183 } BlockOpType; 184 185 void bdrv_info_print(Monitor *mon, const QObject *data); 186 void bdrv_info(Monitor *mon, QObject **ret_data); 187 void bdrv_stats_print(Monitor *mon, const QObject *data); 188 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 189 190 /* disk I/O throttling */ 191 void bdrv_init(void); 192 void bdrv_init_with_whitelist(void); 193 bool bdrv_uses_whitelist(void); 194 BlockDriver *bdrv_find_protocol(const char *filename, 195 bool allow_protocol_prefix, 196 Error **errp); 197 BlockDriver *bdrv_find_format(const char *format_name); 198 int bdrv_create(BlockDriver *drv, const char* filename, 199 QemuOpts *opts, Error **errp); 200 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 201 BlockDriverState *bdrv_new_root(void); 202 BlockDriverState *bdrv_new(void); 203 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 204 void bdrv_replace_in_backing_chain(BlockDriverState *old, 205 BlockDriverState *new); 206 207 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 208 int bdrv_parse_discard_flags(const char *mode, int *flags); 209 BdrvChild *bdrv_open_child(const char *filename, 210 QDict *options, const char *bdref_key, 211 BlockDriverState* parent, 212 const BdrvChildRole *child_role, 213 bool allow_none, Error **errp); 214 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 215 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 216 const char *bdref_key, Error **errp); 217 int bdrv_open(BlockDriverState **pbs, const char *filename, 218 const char *reference, QDict *options, int flags, Error **errp); 219 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 220 BlockDriverState *bs, 221 QDict *options, int flags); 222 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 223 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 224 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 225 BlockReopenQueue *queue, Error **errp); 226 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 227 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 228 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 229 uint8_t *buf, int nb_sectors); 230 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 231 const uint8_t *buf, int nb_sectors); 232 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 233 int nb_sectors, BdrvRequestFlags flags); 234 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 235 int nb_sectors, BdrvRequestFlags flags, 236 BlockCompletionFunc *cb, void *opaque); 237 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 238 int bdrv_pread(BlockDriverState *bs, int64_t offset, 239 void *buf, int count); 240 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 241 const void *buf, int count); 242 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 243 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 244 const void *buf, int count); 245 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 246 int nb_sectors, QEMUIOVector *qiov); 247 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 248 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 249 int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs, 250 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 251 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 252 int nb_sectors, QEMUIOVector *qiov); 253 /* 254 * Efficiently zero a region of the disk image. Note that this is a regular 255 * I/O request like read or write and should have a reasonable size. This 256 * function is not suitable for zeroing the entire image in a single request 257 * because it may allocate memory for the entire region. 258 */ 259 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 260 int nb_sectors, BdrvRequestFlags flags); 261 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 262 const char *backing_file); 263 int bdrv_get_backing_file_depth(BlockDriverState *bs); 264 void bdrv_refresh_filename(BlockDriverState *bs); 265 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 266 int64_t bdrv_nb_sectors(BlockDriverState *bs); 267 int64_t bdrv_getlength(BlockDriverState *bs); 268 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 269 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 270 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 271 int bdrv_commit(BlockDriverState *bs); 272 int bdrv_change_backing_file(BlockDriverState *bs, 273 const char *backing_file, const char *backing_fmt); 274 void bdrv_register(BlockDriver *bdrv); 275 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 276 BlockDriverState *base, 277 const char *backing_file_str); 278 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 279 BlockDriverState *bs); 280 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 281 282 283 typedef struct BdrvCheckResult { 284 int corruptions; 285 int leaks; 286 int check_errors; 287 int corruptions_fixed; 288 int leaks_fixed; 289 int64_t image_end_offset; 290 BlockFragInfo bfi; 291 } BdrvCheckResult; 292 293 typedef enum { 294 BDRV_FIX_LEAKS = 1, 295 BDRV_FIX_ERRORS = 2, 296 } BdrvCheckMode; 297 298 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 299 300 /* The units of offset and total_work_size may be chosen arbitrarily by the 301 * block driver; total_work_size may change during the course of the amendment 302 * operation */ 303 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 304 int64_t total_work_size, void *opaque); 305 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 306 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 307 308 /* external snapshots */ 309 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 310 BlockDriverState *candidate); 311 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 312 313 /* check if a named node can be replaced when doing drive-mirror */ 314 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 315 const char *node_name, Error **errp); 316 317 /* async block I/O */ 318 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 319 QEMUIOVector *iov, int nb_sectors, 320 BlockCompletionFunc *cb, void *opaque); 321 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 322 QEMUIOVector *iov, int nb_sectors, 323 BlockCompletionFunc *cb, void *opaque); 324 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 325 BlockCompletionFunc *cb, void *opaque); 326 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 327 int64_t sector_num, int nb_sectors, 328 BlockCompletionFunc *cb, void *opaque); 329 void bdrv_aio_cancel(BlockAIOCB *acb); 330 void bdrv_aio_cancel_async(BlockAIOCB *acb); 331 332 typedef struct BlockRequest { 333 /* Fields to be filled by caller */ 334 union { 335 struct { 336 int64_t sector; 337 int nb_sectors; 338 int flags; 339 QEMUIOVector *qiov; 340 }; 341 struct { 342 int req; 343 void *buf; 344 }; 345 }; 346 BlockCompletionFunc *cb; 347 void *opaque; 348 349 /* Filled by block layer */ 350 int error; 351 } BlockRequest; 352 353 /* sg packet commands */ 354 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 355 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 356 unsigned long int req, void *buf, 357 BlockCompletionFunc *cb, void *opaque); 358 359 /* Invalidate any cached metadata used by image formats */ 360 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 361 void bdrv_invalidate_cache_all(Error **errp); 362 int bdrv_inactivate_all(void); 363 364 /* Ensure contents are flushed to disk. */ 365 int bdrv_flush(BlockDriverState *bs); 366 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 367 void bdrv_close_all(void); 368 void bdrv_drain(BlockDriverState *bs); 369 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 370 void bdrv_drain_all(void); 371 372 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 373 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 374 int bdrv_has_zero_init_1(BlockDriverState *bs); 375 int bdrv_has_zero_init(BlockDriverState *bs); 376 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 377 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 378 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 379 int nb_sectors, int *pnum, 380 BlockDriverState **file); 381 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 382 BlockDriverState *base, 383 int64_t sector_num, 384 int nb_sectors, int *pnum, 385 BlockDriverState **file); 386 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 387 int *pnum); 388 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 389 int64_t sector_num, int nb_sectors, int *pnum); 390 391 int bdrv_is_read_only(BlockDriverState *bs); 392 int bdrv_is_sg(BlockDriverState *bs); 393 bool bdrv_is_inserted(BlockDriverState *bs); 394 int bdrv_media_changed(BlockDriverState *bs); 395 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 396 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 397 const char *bdrv_get_format_name(BlockDriverState *bs); 398 BlockDriverState *bdrv_find_node(const char *node_name); 399 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 400 BlockDriverState *bdrv_lookup_bs(const char *device, 401 const char *node_name, 402 Error **errp); 403 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 404 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 405 BdrvNextIterator *bdrv_next(BdrvNextIterator *it, BlockDriverState **bs); 406 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 407 int bdrv_is_encrypted(BlockDriverState *bs); 408 int bdrv_key_required(BlockDriverState *bs); 409 int bdrv_set_key(BlockDriverState *bs, const char *key); 410 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 411 int bdrv_query_missing_keys(void); 412 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 413 void *opaque); 414 const char *bdrv_get_node_name(const BlockDriverState *bs); 415 const char *bdrv_get_device_name(const BlockDriverState *bs); 416 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 417 int bdrv_get_flags(BlockDriverState *bs); 418 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 419 const uint8_t *buf, int nb_sectors); 420 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 421 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 422 void bdrv_round_to_clusters(BlockDriverState *bs, 423 int64_t sector_num, int nb_sectors, 424 int64_t *cluster_sector_num, 425 int *cluster_nb_sectors); 426 427 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 428 void bdrv_get_backing_filename(BlockDriverState *bs, 429 char *filename, int filename_size); 430 void bdrv_get_full_backing_filename(BlockDriverState *bs, 431 char *dest, size_t sz, Error **errp); 432 void bdrv_get_full_backing_filename_from_filename(const char *backed, 433 const char *backing, 434 char *dest, size_t sz, 435 Error **errp); 436 int bdrv_is_snapshot(BlockDriverState *bs); 437 438 int path_has_protocol(const char *path); 439 int path_is_absolute(const char *path); 440 void path_combine(char *dest, int dest_size, 441 const char *base_path, 442 const char *filename); 443 444 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 445 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 446 int64_t pos, int size); 447 448 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 449 int64_t pos, int size); 450 451 void bdrv_img_create(const char *filename, const char *fmt, 452 const char *base_filename, const char *base_fmt, 453 char *options, uint64_t img_size, int flags, 454 Error **errp, bool quiet); 455 456 /* Returns the alignment in bytes that is required so that no bounce buffer 457 * is required throughout the stack */ 458 size_t bdrv_min_mem_align(BlockDriverState *bs); 459 /* Returns optimal alignment in bytes for bounce buffer */ 460 size_t bdrv_opt_mem_align(BlockDriverState *bs); 461 void *qemu_blockalign(BlockDriverState *bs, size_t size); 462 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 463 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 464 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 465 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 466 467 void bdrv_enable_copy_on_read(BlockDriverState *bs); 468 void bdrv_disable_copy_on_read(BlockDriverState *bs); 469 470 void bdrv_ref(BlockDriverState *bs); 471 void bdrv_unref(BlockDriverState *bs); 472 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 473 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 474 BlockDriverState *child_bs, 475 const char *child_name, 476 const BdrvChildRole *child_role); 477 478 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 479 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 480 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 481 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 482 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 483 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 484 485 #define BLKDBG_EVENT(child, evt) \ 486 do { \ 487 if (child) { \ 488 bdrv_debug_event(child->bs, evt); \ 489 } \ 490 } while (0) 491 492 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 493 494 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 495 const char *tag); 496 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 497 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 498 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 499 500 /** 501 * bdrv_get_aio_context: 502 * 503 * Returns: the currently bound #AioContext 504 */ 505 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 506 507 /** 508 * bdrv_set_aio_context: 509 * 510 * Changes the #AioContext used for fd handlers, timers, and BHs by this 511 * BlockDriverState and all its children. 512 * 513 * This function must be called with iothread lock held. 514 */ 515 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 516 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 517 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 518 519 void bdrv_io_plug(BlockDriverState *bs); 520 void bdrv_io_unplug(BlockDriverState *bs); 521 void bdrv_io_unplugged_begin(BlockDriverState *bs); 522 void bdrv_io_unplugged_end(BlockDriverState *bs); 523 524 /** 525 * bdrv_drained_begin: 526 * 527 * Begin a quiesced section for exclusive access to the BDS, by disabling 528 * external request sources including NBD server and device model. Note that 529 * this doesn't block timers or coroutines from submitting more requests, which 530 * means block_job_pause is still necessary. 531 * 532 * This function can be recursive. 533 */ 534 void bdrv_drained_begin(BlockDriverState *bs); 535 536 /** 537 * bdrv_drained_end: 538 * 539 * End a quiescent section started by bdrv_drained_begin(). 540 */ 541 void bdrv_drained_end(BlockDriverState *bs); 542 543 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 544 Error **errp); 545 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 546 547 #endif 548