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 /* Signifies that this write request will not change the visible disk 58 * content. */ 59 BDRV_REQ_WRITE_UNCHANGED = 0x40, 60 61 /* Mask of valid flags */ 62 BDRV_REQ_MASK = 0x7f, 63 } BdrvRequestFlags; 64 65 typedef struct BlockSizes { 66 uint32_t phys; 67 uint32_t log; 68 } BlockSizes; 69 70 typedef struct HDGeometry { 71 uint32_t heads; 72 uint32_t sectors; 73 uint32_t cylinders; 74 } HDGeometry; 75 76 #define BDRV_O_RDWR 0x0002 77 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ 78 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 79 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 80 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 81 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 82 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 83 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 84 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 85 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 86 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 87 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 88 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 89 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 90 select an appropriate protocol driver, 91 ignoring the format layer */ 92 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ 93 94 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) 95 96 97 /* Option names of options parsed by the block layer */ 98 99 #define BDRV_OPT_CACHE_WB "cache.writeback" 100 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 101 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 102 #define BDRV_OPT_READ_ONLY "read-only" 103 #define BDRV_OPT_DISCARD "discard" 104 #define BDRV_OPT_FORCE_SHARE "force-share" 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 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) 114 115 /* 116 * Allocation status flags for bdrv_block_status() and friends. 117 * 118 * Public flags: 119 * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer 120 * BDRV_BLOCK_ZERO: offset reads as zero 121 * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data 122 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 123 * layer rather than any backing, set by block layer 124 * BDRV_BLOCK_EOF: the returned pnum covers through end of file for this 125 * layer, set by block layer 126 * 127 * Internal flag: 128 * BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request 129 * that the block layer recompute the answer from the returned 130 * BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID. 131 * 132 * If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the 133 * host offset within the returned BDS that is allocated for the 134 * corresponding raw guest data. However, whether that offset 135 * actually contains data also depends on BDRV_BLOCK_DATA, as follows: 136 * 137 * DATA ZERO OFFSET_VALID 138 * t t t sectors read as zero, returned file is zero at offset 139 * t f t sectors read as valid from file at offset 140 * f t t sectors preallocated, read as zero, returned file not 141 * necessarily zero at offset 142 * f f t sectors preallocated but read from backing_hd, 143 * returned file contains garbage at offset 144 * t t f sectors preallocated, read as zero, unknown offset 145 * t f f sectors read from unknown file or offset 146 * f t f not allocated or unknown offset, read as zero 147 * f f f not allocated or unknown offset, read from backing_hd 148 */ 149 #define BDRV_BLOCK_DATA 0x01 150 #define BDRV_BLOCK_ZERO 0x02 151 #define BDRV_BLOCK_OFFSET_VALID 0x04 152 #define BDRV_BLOCK_RAW 0x08 153 #define BDRV_BLOCK_ALLOCATED 0x10 154 #define BDRV_BLOCK_EOF 0x20 155 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 156 157 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 158 159 typedef struct BDRVReopenState { 160 BlockDriverState *bs; 161 int flags; 162 uint64_t perm, shared_perm; 163 QDict *options; 164 QDict *explicit_options; 165 void *opaque; 166 } BDRVReopenState; 167 168 /* 169 * Block operation types 170 */ 171 typedef enum BlockOpType { 172 BLOCK_OP_TYPE_BACKUP_SOURCE, 173 BLOCK_OP_TYPE_BACKUP_TARGET, 174 BLOCK_OP_TYPE_CHANGE, 175 BLOCK_OP_TYPE_COMMIT_SOURCE, 176 BLOCK_OP_TYPE_COMMIT_TARGET, 177 BLOCK_OP_TYPE_DATAPLANE, 178 BLOCK_OP_TYPE_DRIVE_DEL, 179 BLOCK_OP_TYPE_EJECT, 180 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 181 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 182 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 183 BLOCK_OP_TYPE_MIRROR_SOURCE, 184 BLOCK_OP_TYPE_MIRROR_TARGET, 185 BLOCK_OP_TYPE_RESIZE, 186 BLOCK_OP_TYPE_STREAM, 187 BLOCK_OP_TYPE_REPLACE, 188 BLOCK_OP_TYPE_MAX, 189 } BlockOpType; 190 191 /* Block node permission constants */ 192 enum { 193 /** 194 * A user that has the "permission" of consistent reads is guaranteed that 195 * their view of the contents of the block device is complete and 196 * self-consistent, representing the contents of a disk at a specific 197 * point. 198 * 199 * For most block devices (including their backing files) this is true, but 200 * the property cannot be maintained in a few situations like for 201 * intermediate nodes of a commit block job. 202 */ 203 BLK_PERM_CONSISTENT_READ = 0x01, 204 205 /** This permission is required to change the visible disk contents. */ 206 BLK_PERM_WRITE = 0x02, 207 208 /** 209 * This permission (which is weaker than BLK_PERM_WRITE) is both enough and 210 * required for writes to the block node when the caller promises that 211 * the visible disk content doesn't change. 212 * 213 * As the BLK_PERM_WRITE permission is strictly stronger, either is 214 * sufficient to perform an unchanging write. 215 */ 216 BLK_PERM_WRITE_UNCHANGED = 0x04, 217 218 /** This permission is required to change the size of a block node. */ 219 BLK_PERM_RESIZE = 0x08, 220 221 /** 222 * This permission is required to change the node that this BdrvChild 223 * points to. 224 */ 225 BLK_PERM_GRAPH_MOD = 0x10, 226 227 BLK_PERM_ALL = 0x1f, 228 }; 229 230 char *bdrv_perm_names(uint64_t perm); 231 232 /* disk I/O throttling */ 233 void bdrv_init(void); 234 void bdrv_init_with_whitelist(void); 235 bool bdrv_uses_whitelist(void); 236 int bdrv_is_whitelisted(BlockDriver *drv, bool read_only); 237 BlockDriver *bdrv_find_protocol(const char *filename, 238 bool allow_protocol_prefix, 239 Error **errp); 240 BlockDriver *bdrv_find_format(const char *format_name); 241 int bdrv_create(BlockDriver *drv, const char* filename, 242 QemuOpts *opts, Error **errp); 243 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 244 BlockDriverState *bdrv_new(void); 245 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, 246 Error **errp); 247 void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, 248 Error **errp); 249 250 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 251 int bdrv_parse_discard_flags(const char *mode, int *flags); 252 BdrvChild *bdrv_open_child(const char *filename, 253 QDict *options, const char *bdref_key, 254 BlockDriverState* parent, 255 const BdrvChildRole *child_role, 256 bool allow_none, Error **errp); 257 BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); 258 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, 259 Error **errp); 260 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 261 const char *bdref_key, Error **errp); 262 BlockDriverState *bdrv_open(const char *filename, const char *reference, 263 QDict *options, int flags, Error **errp); 264 BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, 265 int flags, Error **errp); 266 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 267 BlockDriverState *bs, 268 QDict *options, int flags); 269 int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp); 270 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 271 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 272 BlockReopenQueue *queue, Error **errp); 273 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 274 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 275 int bdrv_read(BdrvChild *child, int64_t sector_num, 276 uint8_t *buf, int nb_sectors); 277 int bdrv_write(BdrvChild *child, int64_t sector_num, 278 const uint8_t *buf, int nb_sectors); 279 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, 280 int bytes, BdrvRequestFlags flags); 281 int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); 282 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); 283 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 284 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); 285 int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 286 int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, 287 const void *buf, int count); 288 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num, 289 int nb_sectors, QEMUIOVector *qiov); 290 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num, 291 int nb_sectors, QEMUIOVector *qiov); 292 /* 293 * Efficiently zero a region of the disk image. Note that this is a regular 294 * I/O request like read or write and should have a reasonable size. This 295 * function is not suitable for zeroing the entire image in a single request 296 * because it may allocate memory for the entire region. 297 */ 298 int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, 299 int bytes, BdrvRequestFlags flags); 300 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 301 const char *backing_file); 302 void bdrv_refresh_filename(BlockDriverState *bs); 303 int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, 304 Error **errp); 305 int64_t bdrv_nb_sectors(BlockDriverState *bs); 306 int64_t bdrv_getlength(BlockDriverState *bs); 307 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 308 BlockMeasureInfo *bdrv_measure(BlockDriver *drv, QemuOpts *opts, 309 BlockDriverState *in_bs, Error **errp); 310 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 311 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 312 int bdrv_commit(BlockDriverState *bs); 313 int bdrv_change_backing_file(BlockDriverState *bs, 314 const char *backing_file, const char *backing_fmt); 315 void bdrv_register(BlockDriver *bdrv); 316 int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base, 317 const char *backing_file_str); 318 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 319 BlockDriverState *bs); 320 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 321 322 323 typedef struct BdrvCheckResult { 324 int corruptions; 325 int leaks; 326 int check_errors; 327 int corruptions_fixed; 328 int leaks_fixed; 329 int64_t image_end_offset; 330 BlockFragInfo bfi; 331 } BdrvCheckResult; 332 333 typedef enum { 334 BDRV_FIX_LEAKS = 1, 335 BDRV_FIX_ERRORS = 2, 336 } BdrvCheckMode; 337 338 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 339 340 /* The units of offset and total_work_size may be chosen arbitrarily by the 341 * block driver; total_work_size may change during the course of the amendment 342 * operation */ 343 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 344 int64_t total_work_size, void *opaque); 345 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 346 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 347 348 /* external snapshots */ 349 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 350 BlockDriverState *candidate); 351 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 352 353 /* check if a named node can be replaced when doing drive-mirror */ 354 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 355 const char *node_name, Error **errp); 356 357 /* async block I/O */ 358 void bdrv_aio_cancel(BlockAIOCB *acb); 359 void bdrv_aio_cancel_async(BlockAIOCB *acb); 360 361 /* sg packet commands */ 362 int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); 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 int bdrv_flush_all(void); 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_begin(void); 377 void bdrv_drain_all_end(void); 378 void bdrv_drain_all(void); 379 380 /* Returns NULL when bs == NULL */ 381 AioWait *bdrv_get_aio_wait(BlockDriverState *bs); 382 383 #define BDRV_POLL_WHILE(bs, cond) ({ \ 384 BlockDriverState *bs_ = (bs); \ 385 AIO_WAIT_WHILE(bdrv_get_aio_wait(bs_), \ 386 bdrv_get_aio_context(bs_), \ 387 cond); }) 388 389 int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 390 int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 391 int bdrv_has_zero_init_1(BlockDriverState *bs); 392 int bdrv_has_zero_init(BlockDriverState *bs); 393 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 394 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 395 int bdrv_block_status(BlockDriverState *bs, int64_t offset, 396 int64_t bytes, int64_t *pnum, int64_t *map, 397 BlockDriverState **file); 398 int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base, 399 int64_t offset, int64_t bytes, int64_t *pnum, 400 int64_t *map, BlockDriverState **file); 401 int bdrv_is_allocated(BlockDriverState *bs, int64_t offset, int64_t bytes, 402 int64_t *pnum); 403 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 404 int64_t offset, int64_t bytes, int64_t *pnum); 405 406 bool bdrv_is_read_only(BlockDriverState *bs); 407 int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, 408 bool ignore_allow_rdw, Error **errp); 409 int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); 410 bool bdrv_is_sg(BlockDriverState *bs); 411 bool bdrv_is_inserted(BlockDriverState *bs); 412 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 413 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 414 const char *bdrv_get_format_name(BlockDriverState *bs); 415 BlockDriverState *bdrv_find_node(const char *node_name); 416 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 417 BlockDriverState *bdrv_lookup_bs(const char *device, 418 const char *node_name, 419 Error **errp); 420 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 421 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 422 423 typedef struct BdrvNextIterator { 424 enum { 425 BDRV_NEXT_BACKEND_ROOTS, 426 BDRV_NEXT_MONITOR_OWNED, 427 } phase; 428 BlockBackend *blk; 429 BlockDriverState *bs; 430 } BdrvNextIterator; 431 432 BlockDriverState *bdrv_first(BdrvNextIterator *it); 433 BlockDriverState *bdrv_next(BdrvNextIterator *it); 434 void bdrv_next_cleanup(BdrvNextIterator *it); 435 436 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 437 bool bdrv_is_encrypted(BlockDriverState *bs); 438 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 439 void *opaque); 440 const char *bdrv_get_node_name(const BlockDriverState *bs); 441 const char *bdrv_get_device_name(const BlockDriverState *bs); 442 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 443 int bdrv_get_flags(BlockDriverState *bs); 444 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 445 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 446 void bdrv_round_to_clusters(BlockDriverState *bs, 447 int64_t offset, int64_t bytes, 448 int64_t *cluster_offset, 449 int64_t *cluster_bytes); 450 451 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 452 void bdrv_get_backing_filename(BlockDriverState *bs, 453 char *filename, int filename_size); 454 void bdrv_get_full_backing_filename(BlockDriverState *bs, 455 char *dest, size_t sz, Error **errp); 456 void bdrv_get_full_backing_filename_from_filename(const char *backed, 457 const char *backing, 458 char *dest, size_t sz, 459 Error **errp); 460 461 int path_has_protocol(const char *path); 462 int path_is_absolute(const char *path); 463 void path_combine(char *dest, int dest_size, 464 const char *base_path, 465 const char *filename); 466 467 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 468 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 469 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 470 int64_t pos, int size); 471 472 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 473 int64_t pos, int size); 474 475 void bdrv_img_create(const char *filename, const char *fmt, 476 const char *base_filename, const char *base_fmt, 477 char *options, uint64_t img_size, int flags, 478 bool quiet, Error **errp); 479 480 /* Returns the alignment in bytes that is required so that no bounce buffer 481 * is required throughout the stack */ 482 size_t bdrv_min_mem_align(BlockDriverState *bs); 483 /* Returns optimal alignment in bytes for bounce buffer */ 484 size_t bdrv_opt_mem_align(BlockDriverState *bs); 485 void *qemu_blockalign(BlockDriverState *bs, size_t size); 486 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 487 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 488 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 489 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 490 491 void bdrv_enable_copy_on_read(BlockDriverState *bs); 492 void bdrv_disable_copy_on_read(BlockDriverState *bs); 493 494 void bdrv_ref(BlockDriverState *bs); 495 void bdrv_unref(BlockDriverState *bs); 496 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 497 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 498 BlockDriverState *child_bs, 499 const char *child_name, 500 const BdrvChildRole *child_role, 501 Error **errp); 502 503 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 504 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 505 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 506 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 507 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 508 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 509 510 #define BLKDBG_EVENT(child, evt) \ 511 do { \ 512 if (child) { \ 513 bdrv_debug_event(child->bs, evt); \ 514 } \ 515 } while (0) 516 517 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 518 519 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 520 const char *tag); 521 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 522 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 523 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 524 525 /** 526 * bdrv_get_aio_context: 527 * 528 * Returns: the currently bound #AioContext 529 */ 530 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 531 532 /** 533 * Transfer control to @co in the aio context of @bs 534 */ 535 void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); 536 537 /** 538 * bdrv_set_aio_context: 539 * 540 * Changes the #AioContext used for fd handlers, timers, and BHs by this 541 * BlockDriverState and all its children. 542 * 543 * This function must be called with iothread lock held. 544 */ 545 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 546 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 547 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 548 549 void bdrv_io_plug(BlockDriverState *bs); 550 void bdrv_io_unplug(BlockDriverState *bs); 551 552 /** 553 * bdrv_parent_drained_begin: 554 * 555 * Begin a quiesced section of all users of @bs. This is part of 556 * bdrv_drained_begin. 557 */ 558 void bdrv_parent_drained_begin(BlockDriverState *bs, BdrvChild *ignore); 559 560 /** 561 * bdrv_parent_drained_end: 562 * 563 * End a quiesced section of all users of @bs. This is part of 564 * bdrv_drained_end. 565 */ 566 void bdrv_parent_drained_end(BlockDriverState *bs, BdrvChild *ignore); 567 568 /** 569 * bdrv_drained_begin: 570 * 571 * Begin a quiesced section for exclusive access to the BDS, by disabling 572 * external request sources including NBD server and device model. Note that 573 * this doesn't block timers or coroutines from submitting more requests, which 574 * means block_job_pause is still necessary. 575 * 576 * This function can be recursive. 577 */ 578 void bdrv_drained_begin(BlockDriverState *bs); 579 580 /** 581 * Like bdrv_drained_begin, but recursively begins a quiesced section for 582 * exclusive access to all child nodes as well. 583 */ 584 void bdrv_subtree_drained_begin(BlockDriverState *bs); 585 586 /** 587 * bdrv_drained_end: 588 * 589 * End a quiescent section started by bdrv_drained_begin(). 590 */ 591 void bdrv_drained_end(BlockDriverState *bs); 592 593 /** 594 * End a quiescent section started by bdrv_subtree_drained_begin(). 595 */ 596 void bdrv_subtree_drained_end(BlockDriverState *bs); 597 598 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 599 Error **errp); 600 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 601 602 bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name, 603 uint32_t granularity, Error **errp); 604 /** 605 * 606 * bdrv_register_buf/bdrv_unregister_buf: 607 * 608 * Register/unregister a buffer for I/O. For example, VFIO drivers are 609 * interested to know the memory areas that would later be used for I/O, so 610 * that they can prepare IOMMU mapping etc., to get better performance. 611 */ 612 void bdrv_register_buf(BlockDriverState *bs, void *host, size_t size); 613 void bdrv_unregister_buf(BlockDriverState *bs, void *host); 614 #endif 615