1 #ifndef BLOCK_H 2 #define BLOCK_H 3 4 #include "block/aio.h" 5 #include "qapi/qapi-types-block-core.h" 6 #include "block/aio-wait.h" 7 #include "qemu/iov.h" 8 #include "qemu/coroutine.h" 9 #include "block/accounting.h" 10 #include "block/dirty-bitmap.h" 11 #include "block/blockjob.h" 12 #include "qemu/hbitmap.h" 13 14 /* block.c */ 15 typedef struct BlockDriver BlockDriver; 16 typedef struct BdrvChild BdrvChild; 17 typedef struct BdrvChildRole BdrvChildRole; 18 19 typedef struct BlockDriverInfo { 20 /* in bytes, 0 if irrelevant */ 21 int cluster_size; 22 /* offset at which the VM state can be saved (0 if not possible) */ 23 int64_t vm_state_offset; 24 bool is_dirty; 25 /* 26 * True if unallocated blocks read back as zeroes. This is equivalent 27 * to the LBPRZ flag in the SCSI logical block provisioning page. 28 */ 29 bool unallocated_blocks_are_zero; 30 /* 31 * True if this block driver only supports compressed writes 32 */ 33 bool needs_compressed_writes; 34 } BlockDriverInfo; 35 36 typedef struct BlockFragInfo { 37 uint64_t allocated_clusters; 38 uint64_t total_clusters; 39 uint64_t fragmented_clusters; 40 uint64_t compressed_clusters; 41 } BlockFragInfo; 42 43 typedef enum { 44 BDRV_REQ_COPY_ON_READ = 0x1, 45 BDRV_REQ_ZERO_WRITE = 0x2, 46 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 47 * is allowed to optimize a write zeroes request by unmapping (discarding) 48 * blocks if it is guaranteed that the result will read back as 49 * zeroes. The flag is only passed to the driver if the block device is 50 * opened with BDRV_O_UNMAP. 51 */ 52 BDRV_REQ_MAY_UNMAP = 0x4, 53 BDRV_REQ_NO_SERIALISING = 0x8, 54 BDRV_REQ_FUA = 0x10, 55 BDRV_REQ_WRITE_COMPRESSED = 0x20, 56 57 /* Mask of valid flags */ 58 BDRV_REQ_MASK = 0x3f, 59 } BdrvRequestFlags; 60 61 typedef struct BlockSizes { 62 uint32_t phys; 63 uint32_t log; 64 } BlockSizes; 65 66 typedef struct HDGeometry { 67 uint32_t heads; 68 uint32_t sectors; 69 uint32_t cylinders; 70 } HDGeometry; 71 72 #define BDRV_O_RDWR 0x0002 73 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ 74 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 75 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 76 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 77 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 78 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 79 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 80 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 81 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 82 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 83 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 84 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 85 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 86 select an appropriate protocol driver, 87 ignoring the format layer */ 88 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ 89 90 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) 91 92 93 /* Option names of options parsed by the block layer */ 94 95 #define BDRV_OPT_CACHE_WB "cache.writeback" 96 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 97 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 98 #define BDRV_OPT_READ_ONLY "read-only" 99 #define BDRV_OPT_DISCARD "discard" 100 #define BDRV_OPT_FORCE_SHARE "force-share" 101 102 103 #define BDRV_SECTOR_BITS 9 104 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 105 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 106 107 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 108 INT_MAX >> BDRV_SECTOR_BITS) 109 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) 110 111 /* 112 * Allocation status flags for bdrv_block_status() and friends. 113 * 114 * Public flags: 115 * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer 116 * BDRV_BLOCK_ZERO: offset reads as zero 117 * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data 118 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 119 * layer rather than any backing, set by block layer 120 * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this 121 * layer, set by block layer 122 * 123 * Internal flag: 124 * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request 125 * that the block layer recompute the answer from the returned 126 * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID. 127 * 128 * If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the 129 * host offset within the returned BDS that is allocated for the 130 * corresponding raw guest data. However, whether that offset 131 * actually contains data also depends on BDRV_BLOCK_DATA, as follows: 132 * 133 * DATA ZERO OFFSET_VALID 134 * t t t sectors read as zero, returned file is zero at offset 135 * t f t sectors read as valid from file at offset 136 * f t t sectors preallocated, read as zero, returned file not 137 * necessarily zero at offset 138 * f f t sectors preallocated but read from backing_hd, 139 * returned 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_EOF 0x20 151 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 152 153 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 154 155 typedef struct BDRVReopenState { 156 BlockDriverState *bs; 157 int flags; 158 uint64_t perm, shared_perm; 159 QDict *options; 160 QDict *explicit_options; 161 void *opaque; 162 } BDRVReopenState; 163 164 /* 165 * Block operation types 166 */ 167 typedef enum BlockOpType { 168 BLOCK_OP_TYPE_BACKUP_SOURCE, 169 BLOCK_OP_TYPE_BACKUP_TARGET, 170 BLOCK_OP_TYPE_CHANGE, 171 BLOCK_OP_TYPE_COMMIT_SOURCE, 172 BLOCK_OP_TYPE_COMMIT_TARGET, 173 BLOCK_OP_TYPE_DATAPLANE, 174 BLOCK_OP_TYPE_DRIVE_DEL, 175 BLOCK_OP_TYPE_EJECT, 176 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 177 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 178 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 179 BLOCK_OP_TYPE_MIRROR_SOURCE, 180 BLOCK_OP_TYPE_MIRROR_TARGET, 181 BLOCK_OP_TYPE_RESIZE, 182 BLOCK_OP_TYPE_STREAM, 183 BLOCK_OP_TYPE_REPLACE, 184 BLOCK_OP_TYPE_MAX, 185 } BlockOpType; 186 187 /* Block node permission constants */ 188 enum { 189 /** 190 * A user that has the "permission" of consistent reads is guaranteed that 191 * their view of the contents of the block device is complete and 192 * self-consistent, representing the contents of a disk at a specific 193 * point. 194 * 195 * For most block devices (including their backing files) this is true, but 196 * the property cannot be maintained in a few situations like for 197 * intermediate nodes of a commit block job. 198 */ 199 BLK_PERM_CONSISTENT_READ = 0x01, 200 201 /** This permission is required to change the visible disk contents. */ 202 BLK_PERM_WRITE = 0x02, 203 204 /** 205 * This permission (which is weaker than BLK_PERM_WRITE) is both enough and 206 * required for writes to the block node when the caller promises that 207 * the visible disk content doesn't change. 208 */ 209 BLK_PERM_WRITE_UNCHANGED = 0x04, 210 211 /** This permission is required to change the size of a block node. */ 212 BLK_PERM_RESIZE = 0x08, 213 214 /** 215 * This permission is required to change the node that this BdrvChild 216 * points to. 217 */ 218 BLK_PERM_GRAPH_MOD = 0x10, 219 220 BLK_PERM_ALL = 0x1f, 221 }; 222 223 char *bdrv_perm_names(uint64_t perm); 224 225 /* disk I/O throttling */ 226 void bdrv_init(void); 227 void bdrv_init_with_whitelist(void); 228 bool bdrv_uses_whitelist(void); 229 int bdrv_is_whitelisted(BlockDriver *drv, bool read_only); 230 BlockDriver *bdrv_find_protocol(const char *filename, 231 bool allow_protocol_prefix, 232 Error **errp); 233 BlockDriver *bdrv_find_format(const char *format_name); 234 int bdrv_create(BlockDriver *drv, const char* filename, 235 QemuOpts *opts, Error **errp); 236 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 237 BlockDriverState *bdrv_new(void); 238 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, 239 Error **errp); 240 void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, 241 Error **errp); 242 243 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 244 int bdrv_parse_discard_flags(const char *mode, int *flags); 245 BdrvChild *bdrv_open_child(const char *filename, 246 QDict *options, const char *bdref_key, 247 BlockDriverState* parent, 248 const BdrvChildRole *child_role, 249 bool allow_none, Error **errp); 250 BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); 251 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, 252 Error **errp); 253 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 254 const char *bdref_key, Error **errp); 255 BlockDriverState *bdrv_open(const char *filename, const char *reference, 256 QDict *options, int flags, Error **errp); 257 BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, 258 int flags, Error **errp); 259 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 260 BlockDriverState *bs, 261 QDict *options, int flags); 262 int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp); 263 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 264 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 265 BlockReopenQueue *queue, Error **errp); 266 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 267 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 268 int bdrv_read(BdrvChild *child, int64_t sector_num, 269 uint8_t *buf, int nb_sectors); 270 int bdrv_write(BdrvChild *child, int64_t sector_num, 271 const uint8_t *buf, int nb_sectors); 272 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, 273 int bytes, BdrvRequestFlags flags); 274 int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); 275 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); 276 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 277 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); 278 int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 279 int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, 280 const void *buf, int count); 281 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num, 282 int nb_sectors, QEMUIOVector *qiov); 283 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num, 284 int nb_sectors, QEMUIOVector *qiov); 285 /* 286 * Efficiently zero a region of the disk image. Note that this is a regular 287 * I/O request like read or write and should have a reasonable size. This 288 * function is not suitable for zeroing the entire image in a single request 289 * because it may allocate memory for the entire region. 290 */ 291 int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, 292 int bytes, BdrvRequestFlags flags); 293 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 294 const char *backing_file); 295 void bdrv_refresh_filename(BlockDriverState *bs); 296 int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, 297 Error **errp); 298 int64_t bdrv_nb_sectors(BlockDriverState *bs); 299 int64_t bdrv_getlength(BlockDriverState *bs); 300 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 301 BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, 302 BlockDriverState *in_bs, Error **errp); 303 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 304 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 305 int bdrv_commit(BlockDriverState *bs); 306 int bdrv_change_backing_file(BlockDriverState *bs, 307 const char *backing_file, const char *backing_fmt); 308 void bdrv_register(BlockDriver *bdrv); 309 int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, 310 const char *backing_file_str); 311 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 312 BlockDriverState *bs); 313 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 314 315 316 typedef struct BdrvCheckResult { 317 int corruptions; 318 int leaks; 319 int check_errors; 320 int corruptions_fixed; 321 int leaks_fixed; 322 int64_t image_end_offset; 323 BlockFragInfo bfi; 324 } BdrvCheckResult; 325 326 typedef enum { 327 BDRV_FIX_LEAKS = 1, 328 BDRV_FIX_ERRORS = 2, 329 } BdrvCheckMode; 330 331 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 332 333 /* The units of offset and total_work_size may be chosen arbitrarily by the 334 * block driver; total_work_size may change during the course of the amendment 335 * operation */ 336 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 337 int64_t total_work_size, void *opaque); 338 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 339 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 340 341 /* external snapshots */ 342 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 343 BlockDriverState *candidate); 344 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 345 346 /* check if a named node can be replaced when doing drive-mirror */ 347 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 348 const char *node_name, Error **errp); 349 350 /* async block I/O */ 351 void bdrv_aio_cancel(BlockAIOCB *acb); 352 void bdrv_aio_cancel_async(BlockAIOCB *acb); 353 354 /* sg packet commands */ 355 int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); 356 357 /* Invalidate any cached metadata used by image formats */ 358 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 359 void bdrv_invalidate_cache_all(Error **errp); 360 int bdrv_inactivate_all(void); 361 362 /* Ensure contents are flushed to disk. */ 363 int bdrv_flush(BlockDriverState *bs); 364 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 365 int bdrv_flush_all(void); 366 void bdrv_close_all(void); 367 void bdrv_drain(BlockDriverState *bs); 368 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 369 void bdrv_drain_all_begin(void); 370 void bdrv_drain_all_end(void); 371 void bdrv_drain_all(void); 372 373 /* Returns NULL when bs == NULL */ 374 AioWait *bdrv_get_aio_wait(BlockDriverState *bs); 375 376 #define BDRV_POLL_WHILE(bs, cond) ({ \ 377 BlockDriverState *bs_ = (bs); \ 378 AIO_WAIT_WHILE(bdrv_get_aio_wait(bs_), \ 379 bdrv_get_aio_context(bs_), \ 380 cond); }) 381 382 int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 383 int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 384 int bdrv_has_zero_init_1(BlockDriverState *bs); 385 int bdrv_has_zero_init(BlockDriverState *bs); 386 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 387 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 388 int bdrv_block_status(BlockDriverState *bs, int64_t offset, 389 int64_t bytes, int64_t *pnum, int64_t *map, 390 BlockDriverState **file); 391 int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, 392 int64_t offset, int64_t bytes, int64_t *pnum, 393 int64_t *map, BlockDriverState **file); 394 int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, 395 int64_t *pnum); 396 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 397 int64_t offset, int64_t bytes, int64_t *pnum); 398 399 bool bdrv_is_read_only(BlockDriverState *bs); 400 int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, 401 bool ignore_allow_rdw, Error **errp); 402 int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); 403 bool bdrv_is_sg(BlockDriverState *bs); 404 bool bdrv_is_inserted(BlockDriverState *bs); 405 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 406 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 407 const char *bdrv_get_format_name(BlockDriverState *bs); 408 BlockDriverState *bdrv_find_node(const char *node_name); 409 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 410 BlockDriverState *bdrv_lookup_bs(const char *device, 411 const char *node_name, 412 Error **errp); 413 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 414 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 415 416 typedef struct BdrvNextIterator { 417 enum { 418 BDRV_NEXT_BACKEND_ROOTS, 419 BDRV_NEXT_MONITOR_OWNED, 420 } phase; 421 BlockBackend *blk; 422 BlockDriverState *bs; 423 } BdrvNextIterator; 424 425 BlockDriverState *bdrv_first(BdrvNextIterator *it); 426 BlockDriverState *bdrv_next(BdrvNextIterator *it); 427 void bdrv_next_cleanup(BdrvNextIterator *it); 428 429 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 430 bool bdrv_is_encrypted(BlockDriverState *bs); 431 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 432 void *opaque); 433 const char *bdrv_get_node_name(const BlockDriverState *bs); 434 const char *bdrv_get_device_name(const BlockDriverState *bs); 435 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 436 int bdrv_get_flags(BlockDriverState *bs); 437 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 438 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 439 void bdrv_round_to_clusters(BlockDriverState *bs, 440 int64_t offset, int64_t bytes, 441 int64_t *cluster_offset, 442 int64_t *cluster_bytes); 443 444 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 445 void bdrv_get_backing_filename(BlockDriverState *bs, 446 char *filename, int filename_size); 447 void bdrv_get_full_backing_filename(BlockDriverState *bs, 448 char *dest, size_t sz, Error **errp); 449 void bdrv_get_full_backing_filename_from_filename(const char *backed, 450 const char *backing, 451 char *dest, size_t sz, 452 Error **errp); 453 454 int path_has_protocol(const char *path); 455 int path_is_absolute(const char *path); 456 void path_combine(char *dest, int dest_size, 457 const char *base_path, 458 const char *filename); 459 460 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 461 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 462 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 463 int64_t pos, int size); 464 465 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 466 int64_t pos, int size); 467 468 void bdrv_img_create(const char *filename, const char *fmt, 469 const char *base_filename, const char *base_fmt, 470 char *options, uint64_t img_size, int flags, 471 bool quiet, Error **errp); 472 473 /* Returns the alignment in bytes that is required so that no bounce buffer 474 * is required throughout the stack */ 475 size_t bdrv_min_mem_align(BlockDriverState *bs); 476 /* Returns optimal alignment in bytes for bounce buffer */ 477 size_t bdrv_opt_mem_align(BlockDriverState *bs); 478 void *qemu_blockalign(BlockDriverState *bs, size_t size); 479 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 480 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 481 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 482 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 483 484 void bdrv_enable_copy_on_read(BlockDriverState *bs); 485 void bdrv_disable_copy_on_read(BlockDriverState *bs); 486 487 void bdrv_ref(BlockDriverState *bs); 488 void bdrv_unref(BlockDriverState *bs); 489 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 490 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 491 BlockDriverState *child_bs, 492 const char *child_name, 493 const BdrvChildRole *child_role, 494 Error **errp); 495 496 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 497 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 498 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 499 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 500 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 501 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 502 503 #define BLKDBG_EVENT(child, evt) \ 504 do { \ 505 if (child) { \ 506 bdrv_debug_event(child->bs, evt); \ 507 } \ 508 } while (0) 509 510 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 511 512 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 513 const char *tag); 514 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 515 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 516 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 517 518 /** 519 * bdrv_get_aio_context: 520 * 521 * Returns: the currently bound #AioContext 522 */ 523 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 524 525 /** 526 * Transfer control to @co in the aio context of @bs 527 */ 528 void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); 529 530 /** 531 * bdrv_set_aio_context: 532 * 533 * Changes the #AioContext used for fd handlers, timers, and BHs by this 534 * BlockDriverState and all its children. 535 * 536 * This function must be called with iothread lock held. 537 */ 538 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 539 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 540 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 541 542 void bdrv_io_plug(BlockDriverState *bs); 543 void bdrv_io_unplug(BlockDriverState *bs); 544 545 /** 546 * bdrv_parent_drained_begin: 547 * 548 * Begin a quiesced section of all users of @bs. This is part of 549 * bdrv_drained_begin. 550 */ 551 void bdrv_parent_drained_begin(BlockDriverState *bs, BdrvChild *ignore); 552 553 /** 554 * bdrv_parent_drained_end: 555 * 556 * End a quiesced section of all users of @bs. This is part of 557 * bdrv_drained_end. 558 */ 559 void bdrv_parent_drained_end(BlockDriverState *bs, BdrvChild *ignore); 560 561 /** 562 * bdrv_drained_begin: 563 * 564 * Begin a quiesced section for exclusive access to the BDS, by disabling 565 * external request sources including NBD server and device model. Note that 566 * this doesn't block timers or coroutines from submitting more requests, which 567 * means block_job_pause is still necessary. 568 * 569 * This function can be recursive. 570 */ 571 void bdrv_drained_begin(BlockDriverState *bs); 572 573 /** 574 * Like bdrv_drained_begin, but recursively begins a quiesced section for 575 * exclusive access to all child nodes as well. 576 */ 577 void bdrv_subtree_drained_begin(BlockDriverState *bs); 578 579 /** 580 * bdrv_drained_end: 581 * 582 * End a quiescent section started by bdrv_drained_begin(). 583 */ 584 void bdrv_drained_end(BlockDriverState *bs); 585 586 /** 587 * End a quiescent section started by bdrv_subtree_drained_begin(). 588 */ 589 void bdrv_subtree_drained_end(BlockDriverState *bs); 590 591 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 592 Error **errp); 593 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 594 595 bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, 596 uint32_t granularity, Error **errp); 597 /** 598 * 599 * bdrv_register_buf/bdrv_unregister_buf: 600 * 601 * Register/unregister a buffer for I/O. For example, VFIO drivers are 602 * interested to know the memory areas that would later be used for I/O, so 603 * that they can prepare IOMMU mapping etc., to get better performance. 604 */ 605 void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); 606 void bdrv_unregister_buf(BlockDriverState *bs, void *host); 607 #endif 608