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 "block/blockjob.h" 11 #include "qapi/qmp/qobject.h" 12 #include "qapi-types.h" 13 #include "qemu/hbitmap.h" 14 15 /* block.c */ 16 typedef struct BlockDriver BlockDriver; 17 typedef struct BdrvChild BdrvChild; 18 typedef struct BdrvChildRole BdrvChildRole; 19 20 typedef struct BlockDriverInfo { 21 /* in bytes, 0 if irrelevant */ 22 int cluster_size; 23 /* offset at which the VM state can be saved (0 if not possible) */ 24 int64_t vm_state_offset; 25 bool is_dirty; 26 /* 27 * True if unallocated blocks read back as zeroes. This is equivalent 28 * to the LBPRZ flag in the SCSI logical block provisioning page. 29 */ 30 bool unallocated_blocks_are_zero; 31 /* 32 * True if the driver can optimize writing zeroes by unmapping 33 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 34 * with the difference that in qemu a discard is allowed to silently 35 * fail. Therefore we have to use bdrv_pwrite_zeroes with the 36 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 37 * After this call the driver has to guarantee that the contents read 38 * back as zero. It is additionally required that the block device is 39 * opened with BDRV_O_UNMAP flag for this to work. 40 */ 41 bool can_write_zeroes_with_unmap; 42 /* 43 * True if this block driver only supports compressed writes 44 */ 45 bool needs_compressed_writes; 46 } BlockDriverInfo; 47 48 typedef struct BlockFragInfo { 49 uint64_t allocated_clusters; 50 uint64_t total_clusters; 51 uint64_t fragmented_clusters; 52 uint64_t compressed_clusters; 53 } BlockFragInfo; 54 55 typedef enum { 56 BDRV_REQ_COPY_ON_READ = 0x1, 57 BDRV_REQ_ZERO_WRITE = 0x2, 58 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 59 * is allowed to optimize a write zeroes request by unmapping (discarding) 60 * blocks if it is guaranteed that the result will read back as 61 * zeroes. The flag is only passed to the driver if the block device is 62 * opened with BDRV_O_UNMAP. 63 */ 64 BDRV_REQ_MAY_UNMAP = 0x4, 65 BDRV_REQ_NO_SERIALISING = 0x8, 66 BDRV_REQ_FUA = 0x10, 67 BDRV_REQ_WRITE_COMPRESSED = 0x20, 68 69 /* Mask of valid flags */ 70 BDRV_REQ_MASK = 0x3f, 71 } BdrvRequestFlags; 72 73 typedef struct BlockSizes { 74 uint32_t phys; 75 uint32_t log; 76 } BlockSizes; 77 78 typedef struct HDGeometry { 79 uint32_t heads; 80 uint32_t sectors; 81 uint32_t cylinders; 82 } HDGeometry; 83 84 #define BDRV_O_RDWR 0x0002 85 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 86 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 87 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 88 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 89 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 90 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 91 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 92 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 93 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 94 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 95 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 96 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 97 select an appropriate protocol driver, 98 ignoring the format layer */ 99 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ 100 101 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) 102 103 104 /* Option names of options parsed by the block layer */ 105 106 #define BDRV_OPT_CACHE_WB "cache.writeback" 107 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 108 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 109 #define BDRV_OPT_READ_ONLY "read-only" 110 #define BDRV_OPT_DISCARD "discard" 111 112 113 #define BDRV_SECTOR_BITS 9 114 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 115 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 116 117 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 118 INT_MAX >> BDRV_SECTOR_BITS) 119 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) 120 121 /* 122 * Allocation status flags 123 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status. 124 * BDRV_BLOCK_ZERO: sectors read as zero 125 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by 126 * bdrv_get_block_status. 127 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 128 * layer (as opposed to the backing file) 129 * BDRV_BLOCK_RAW: used internally to indicate that the request 130 * was answered by the raw driver and that one 131 * should look in bs->file directly. 132 * 133 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 134 * bs->file where sector data can be read from as raw data. 135 * 136 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 137 * 138 * DATA ZERO OFFSET_VALID 139 * t t t sectors read as zero, bs->file is zero at offset 140 * t f t sectors read as valid from bs->file at offset 141 * f t t sectors preallocated, read as zero, bs->file not 142 * necessarily zero at offset 143 * f f t sectors preallocated but read from backing_hd, 144 * bs->file contains garbage at offset 145 * t t f sectors preallocated, read as zero, unknown offset 146 * t f f sectors read from unknown file or offset 147 * f t f not allocated or unknown offset, read as zero 148 * f f f not allocated or unknown offset, read from backing_hd 149 */ 150 #define BDRV_BLOCK_DATA 0x01 151 #define BDRV_BLOCK_ZERO 0x02 152 #define BDRV_BLOCK_OFFSET_VALID 0x04 153 #define BDRV_BLOCK_RAW 0x08 154 #define BDRV_BLOCK_ALLOCATED 0x10 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 QDict *options; 163 QDict *explicit_options; 164 void *opaque; 165 } BDRVReopenState; 166 167 /* 168 * Block operation types 169 */ 170 typedef enum BlockOpType { 171 BLOCK_OP_TYPE_BACKUP_SOURCE, 172 BLOCK_OP_TYPE_BACKUP_TARGET, 173 BLOCK_OP_TYPE_CHANGE, 174 BLOCK_OP_TYPE_COMMIT_SOURCE, 175 BLOCK_OP_TYPE_COMMIT_TARGET, 176 BLOCK_OP_TYPE_DATAPLANE, 177 BLOCK_OP_TYPE_DRIVE_DEL, 178 BLOCK_OP_TYPE_EJECT, 179 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 180 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 181 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 182 BLOCK_OP_TYPE_MIRROR_SOURCE, 183 BLOCK_OP_TYPE_MIRROR_TARGET, 184 BLOCK_OP_TYPE_RESIZE, 185 BLOCK_OP_TYPE_STREAM, 186 BLOCK_OP_TYPE_REPLACE, 187 BLOCK_OP_TYPE_MAX, 188 } BlockOpType; 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(void); 202 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 203 void bdrv_replace_in_backing_chain(BlockDriverState *old, 204 BlockDriverState *new); 205 206 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 207 int bdrv_parse_discard_flags(const char *mode, int *flags); 208 BdrvChild *bdrv_open_child(const char *filename, 209 QDict *options, const char *bdref_key, 210 BlockDriverState* parent, 211 const BdrvChildRole *child_role, 212 bool allow_none, Error **errp); 213 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 214 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 215 const char *bdref_key, Error **errp); 216 BlockDriverState *bdrv_open(const char *filename, const char *reference, 217 QDict *options, int flags, Error **errp); 218 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 219 BlockDriverState *bs, 220 QDict *options, int flags); 221 int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp); 222 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 223 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 224 BlockReopenQueue *queue, Error **errp); 225 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 226 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 227 int bdrv_read(BdrvChild *child, int64_t sector_num, 228 uint8_t *buf, int nb_sectors); 229 int bdrv_write(BdrvChild *child, int64_t sector_num, 230 const uint8_t *buf, int nb_sectors); 231 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, 232 int count, BdrvRequestFlags flags); 233 int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); 234 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); 235 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 236 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); 237 int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 238 int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, 239 const void *buf, int count); 240 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num, 241 int nb_sectors, QEMUIOVector *qiov); 242 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num, 243 int nb_sectors, QEMUIOVector *qiov); 244 /* 245 * Efficiently zero a region of the disk image. Note that this is a regular 246 * I/O request like read or write and should have a reasonable size. This 247 * function is not suitable for zeroing the entire image in a single request 248 * because it may allocate memory for the entire region. 249 */ 250 int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, 251 int count, BdrvRequestFlags flags); 252 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 253 const char *backing_file); 254 int bdrv_get_backing_file_depth(BlockDriverState *bs); 255 void bdrv_refresh_filename(BlockDriverState *bs); 256 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 257 int64_t bdrv_nb_sectors(BlockDriverState *bs); 258 int64_t bdrv_getlength(BlockDriverState *bs); 259 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 260 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 261 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 262 int bdrv_commit(BlockDriverState *bs); 263 int bdrv_change_backing_file(BlockDriverState *bs, 264 const char *backing_file, const char *backing_fmt); 265 void bdrv_register(BlockDriver *bdrv); 266 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 267 BlockDriverState *base, 268 const char *backing_file_str); 269 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 270 BlockDriverState *bs); 271 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 272 273 274 typedef struct BdrvCheckResult { 275 int corruptions; 276 int leaks; 277 int check_errors; 278 int corruptions_fixed; 279 int leaks_fixed; 280 int64_t image_end_offset; 281 BlockFragInfo bfi; 282 } BdrvCheckResult; 283 284 typedef enum { 285 BDRV_FIX_LEAKS = 1, 286 BDRV_FIX_ERRORS = 2, 287 } BdrvCheckMode; 288 289 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 290 291 /* The units of offset and total_work_size may be chosen arbitrarily by the 292 * block driver; total_work_size may change during the course of the amendment 293 * operation */ 294 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 295 int64_t total_work_size, void *opaque); 296 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 297 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 298 299 /* external snapshots */ 300 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 301 BlockDriverState *candidate); 302 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 303 304 /* check if a named node can be replaced when doing drive-mirror */ 305 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 306 const char *node_name, Error **errp); 307 308 /* async block I/O */ 309 BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num, 310 QEMUIOVector *iov, int nb_sectors, 311 BlockCompletionFunc *cb, void *opaque); 312 BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num, 313 QEMUIOVector *iov, int nb_sectors, 314 BlockCompletionFunc *cb, void *opaque); 315 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 316 BlockCompletionFunc *cb, void *opaque); 317 void bdrv_aio_cancel(BlockAIOCB *acb); 318 void bdrv_aio_cancel_async(BlockAIOCB *acb); 319 320 /* sg packet commands */ 321 int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); 322 323 /* Invalidate any cached metadata used by image formats */ 324 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 325 void bdrv_invalidate_cache_all(Error **errp); 326 int bdrv_inactivate_all(void); 327 328 /* Ensure contents are flushed to disk. */ 329 int bdrv_flush(BlockDriverState *bs); 330 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 331 int bdrv_flush_all(void); 332 void bdrv_close_all(void); 333 void bdrv_drain(BlockDriverState *bs); 334 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 335 void bdrv_drain_all_begin(void); 336 void bdrv_drain_all_end(void); 337 void bdrv_drain_all(void); 338 339 #define BDRV_POLL_WHILE(bs, cond) ({ \ 340 bool waited_ = false; \ 341 BlockDriverState *bs_ = (bs); \ 342 AioContext *ctx_ = bdrv_get_aio_context(bs_); \ 343 if (aio_context_in_iothread(ctx_)) { \ 344 while ((cond)) { \ 345 aio_poll(ctx_, true); \ 346 waited_ = true; \ 347 } \ 348 } else { \ 349 assert(qemu_get_current_aio_context() == \ 350 qemu_get_aio_context()); \ 351 /* Ask bdrv_dec_in_flight to wake up the main \ 352 * QEMU AioContext. Extra I/O threads never take \ 353 * other I/O threads' AioContexts (see for example \ 354 * block_job_defer_to_main_loop for how to do it). \ 355 */ \ 356 assert(!bs_->wakeup); \ 357 bs_->wakeup = true; \ 358 while ((cond)) { \ 359 aio_context_release(ctx_); \ 360 aio_poll(qemu_get_aio_context(), true); \ 361 aio_context_acquire(ctx_); \ 362 waited_ = true; \ 363 } \ 364 bs_->wakeup = false; \ 365 } \ 366 waited_; }) 367 368 int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int count); 369 int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int count); 370 int bdrv_has_zero_init_1(BlockDriverState *bs); 371 int bdrv_has_zero_init(BlockDriverState *bs); 372 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 373 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 374 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 375 int nb_sectors, int *pnum, 376 BlockDriverState **file); 377 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 378 BlockDriverState *base, 379 int64_t sector_num, 380 int nb_sectors, int *pnum, 381 BlockDriverState **file); 382 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 383 int *pnum); 384 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 385 int64_t sector_num, int nb_sectors, int *pnum); 386 387 bool bdrv_is_read_only(BlockDriverState *bs); 388 bool bdrv_is_sg(BlockDriverState *bs); 389 bool bdrv_is_inserted(BlockDriverState *bs); 390 int bdrv_media_changed(BlockDriverState *bs); 391 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 392 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 393 const char *bdrv_get_format_name(BlockDriverState *bs); 394 BlockDriverState *bdrv_find_node(const char *node_name); 395 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 396 BlockDriverState *bdrv_lookup_bs(const char *device, 397 const char *node_name, 398 Error **errp); 399 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 400 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 401 402 typedef struct BdrvNextIterator { 403 enum { 404 BDRV_NEXT_BACKEND_ROOTS, 405 BDRV_NEXT_MONITOR_OWNED, 406 } phase; 407 BlockBackend *blk; 408 BlockDriverState *bs; 409 } BdrvNextIterator; 410 411 BlockDriverState *bdrv_first(BdrvNextIterator *it); 412 BlockDriverState *bdrv_next(BdrvNextIterator *it); 413 414 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 415 bool bdrv_is_encrypted(BlockDriverState *bs); 416 bool bdrv_key_required(BlockDriverState *bs); 417 int bdrv_set_key(BlockDriverState *bs, const char *key); 418 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 419 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 420 void *opaque); 421 const char *bdrv_get_node_name(const BlockDriverState *bs); 422 const char *bdrv_get_device_name(const BlockDriverState *bs); 423 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 424 int bdrv_get_flags(BlockDriverState *bs); 425 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 426 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 427 void bdrv_round_sectors_to_clusters(BlockDriverState *bs, 428 int64_t sector_num, int nb_sectors, 429 int64_t *cluster_sector_num, 430 int *cluster_nb_sectors); 431 void bdrv_round_to_clusters(BlockDriverState *bs, 432 int64_t offset, unsigned int bytes, 433 int64_t *cluster_offset, 434 unsigned int *cluster_bytes); 435 436 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 437 void bdrv_get_backing_filename(BlockDriverState *bs, 438 char *filename, int filename_size); 439 void bdrv_get_full_backing_filename(BlockDriverState *bs, 440 char *dest, size_t sz, Error **errp); 441 void bdrv_get_full_backing_filename_from_filename(const char *backed, 442 const char *backing, 443 char *dest, size_t sz, 444 Error **errp); 445 446 int path_has_protocol(const char *path); 447 int path_is_absolute(const char *path); 448 void path_combine(char *dest, int dest_size, 449 const char *base_path, 450 const char *filename); 451 452 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 453 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 454 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 455 int64_t pos, int size); 456 457 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 458 int64_t pos, int size); 459 460 void bdrv_img_create(const char *filename, const char *fmt, 461 const char *base_filename, const char *base_fmt, 462 char *options, uint64_t img_size, int flags, 463 Error **errp, bool quiet); 464 465 /* Returns the alignment in bytes that is required so that no bounce buffer 466 * is required throughout the stack */ 467 size_t bdrv_min_mem_align(BlockDriverState *bs); 468 /* Returns optimal alignment in bytes for bounce buffer */ 469 size_t bdrv_opt_mem_align(BlockDriverState *bs); 470 void *qemu_blockalign(BlockDriverState *bs, size_t size); 471 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 472 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 473 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 474 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 475 476 void bdrv_enable_copy_on_read(BlockDriverState *bs); 477 void bdrv_disable_copy_on_read(BlockDriverState *bs); 478 479 void bdrv_ref(BlockDriverState *bs); 480 void bdrv_unref(BlockDriverState *bs); 481 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 482 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 483 BlockDriverState *child_bs, 484 const char *child_name, 485 const BdrvChildRole *child_role); 486 487 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 488 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 489 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 490 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 491 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 492 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 493 494 #define BLKDBG_EVENT(child, evt) \ 495 do { \ 496 if (child) { \ 497 bdrv_debug_event(child->bs, evt); \ 498 } \ 499 } while (0) 500 501 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 502 503 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 504 const char *tag); 505 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 506 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 507 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 508 509 /** 510 * bdrv_get_aio_context: 511 * 512 * Returns: the currently bound #AioContext 513 */ 514 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 515 516 /** 517 * bdrv_set_aio_context: 518 * 519 * Changes the #AioContext used for fd handlers, timers, and BHs by this 520 * BlockDriverState and all its children. 521 * 522 * This function must be called with iothread lock held. 523 */ 524 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 525 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 526 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 527 528 void bdrv_io_plug(BlockDriverState *bs); 529 void bdrv_io_unplug(BlockDriverState *bs); 530 531 /** 532 * bdrv_drained_begin: 533 * 534 * Begin a quiesced section for exclusive access to the BDS, by disabling 535 * external request sources including NBD server and device model. Note that 536 * this doesn't block timers or coroutines from submitting more requests, which 537 * means block_job_pause is still necessary. 538 * 539 * This function can be recursive. 540 */ 541 void bdrv_drained_begin(BlockDriverState *bs); 542 543 /** 544 * bdrv_drained_end: 545 * 546 * End a quiescent section started by bdrv_drained_begin(). 547 */ 548 void bdrv_drained_end(BlockDriverState *bs); 549 550 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 551 Error **errp); 552 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 553 554 #endif 555