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 21 typedef struct BlockDriverInfo { 22 /* in bytes, 0 if irrelevant */ 23 int cluster_size; 24 /* offset at which the VM state can be saved (0 if not possible) */ 25 int64_t vm_state_offset; 26 bool is_dirty; 27 /* 28 * True if unallocated blocks read back as zeroes. This is equivalent 29 * to the LBPRZ flag in the SCSI logical block provisioning page. 30 */ 31 bool unallocated_blocks_are_zero; 32 /* 33 * True if the driver can optimize writing zeroes by unmapping 34 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 35 * with the difference that in qemu a discard is allowed to silently 36 * fail. Therefore we have to use bdrv_pwrite_zeroes with the 37 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 38 * After this call the driver has to guarantee that the contents read 39 * back as zero. It is additionally required that the block device is 40 * opened with BDRV_O_UNMAP flag for this to work. 41 */ 42 bool can_write_zeroes_with_unmap; 43 /* 44 * True if this block driver only supports compressed writes 45 */ 46 bool needs_compressed_writes; 47 } BlockDriverInfo; 48 49 typedef struct BlockFragInfo { 50 uint64_t allocated_clusters; 51 uint64_t total_clusters; 52 uint64_t fragmented_clusters; 53 uint64_t compressed_clusters; 54 } BlockFragInfo; 55 56 typedef enum { 57 BDRV_REQ_COPY_ON_READ = 0x1, 58 BDRV_REQ_ZERO_WRITE = 0x2, 59 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 60 * is allowed to optimize a write zeroes request by unmapping (discarding) 61 * blocks if it is guaranteed that the result will read back as 62 * zeroes. The flag is only passed to the driver if the block device is 63 * opened with BDRV_O_UNMAP. 64 */ 65 BDRV_REQ_MAY_UNMAP = 0x4, 66 BDRV_REQ_NO_SERIALISING = 0x8, 67 BDRV_REQ_FUA = 0x10, 68 69 /* Mask of valid flags */ 70 BDRV_REQ_MASK = 0x1f, 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" 109 110 111 #define BDRV_SECTOR_BITS 9 112 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 113 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 114 115 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 116 INT_MAX >> BDRV_SECTOR_BITS) 117 118 /* 119 * Allocation status flags 120 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status. 121 * BDRV_BLOCK_ZERO: sectors read as zero 122 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by 123 * bdrv_get_block_status. 124 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 125 * layer (as opposed to the backing file) 126 * BDRV_BLOCK_RAW: used internally to indicate that the request 127 * was answered by the raw driver and that one 128 * should look in bs->file directly. 129 * 130 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 131 * bs->file where sector data can be read from as raw data. 132 * 133 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 134 * 135 * DATA ZERO OFFSET_VALID 136 * t t t sectors read as zero, bs->file is zero at offset 137 * t f t sectors read as valid from bs->file at offset 138 * f t t sectors preallocated, read as zero, bs->file not 139 * necessarily zero at offset 140 * f f t sectors preallocated but read from backing_hd, 141 * bs->file contains garbage at offset 142 * t t f sectors preallocated, read as zero, unknown offset 143 * t f f sectors read from unknown file or offset 144 * f t f not allocated or unknown offset, read as zero 145 * f f f not allocated or unknown offset, read from backing_hd 146 */ 147 #define BDRV_BLOCK_DATA 0x01 148 #define BDRV_BLOCK_ZERO 0x02 149 #define BDRV_BLOCK_OFFSET_VALID 0x04 150 #define BDRV_BLOCK_RAW 0x08 151 #define BDRV_BLOCK_ALLOCATED 0x10 152 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 153 154 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 155 156 typedef struct BDRVReopenState { 157 BlockDriverState *bs; 158 int flags; 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 void bdrv_info_print(Monitor *mon, const QObject *data); 188 void bdrv_info(Monitor *mon, QObject **ret_data); 189 void bdrv_stats_print(Monitor *mon, const QObject *data); 190 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 191 192 /* disk I/O throttling */ 193 void bdrv_init(void); 194 void bdrv_init_with_whitelist(void); 195 bool bdrv_uses_whitelist(void); 196 BlockDriver *bdrv_find_protocol(const char *filename, 197 bool allow_protocol_prefix, 198 Error **errp); 199 BlockDriver *bdrv_find_format(const char *format_name); 200 int bdrv_create(BlockDriver *drv, const char* filename, 201 QemuOpts *opts, Error **errp); 202 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 203 BlockDriverState *bdrv_new(void); 204 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 205 void bdrv_replace_in_backing_chain(BlockDriverState *old, 206 BlockDriverState *new); 207 208 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 209 int bdrv_parse_discard_flags(const char *mode, int *flags); 210 BdrvChild *bdrv_open_child(const char *filename, 211 QDict *options, const char *bdref_key, 212 BlockDriverState* parent, 213 const BdrvChildRole *child_role, 214 bool allow_none, Error **errp); 215 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 216 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 217 const char *bdref_key, Error **errp); 218 BlockDriverState *bdrv_open(const char *filename, const char *reference, 219 QDict *options, int flags, Error **errp); 220 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 221 BlockDriverState *bs, 222 QDict *options, int flags); 223 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 224 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 225 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 226 BlockReopenQueue *queue, Error **errp); 227 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 228 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 229 int bdrv_read(BdrvChild *child, int64_t sector_num, 230 uint8_t *buf, int nb_sectors); 231 int bdrv_write(BdrvChild *child, int64_t sector_num, 232 const uint8_t *buf, int nb_sectors); 233 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, 234 int count, BdrvRequestFlags flags); 235 int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); 236 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); 237 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 238 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); 239 int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 240 int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, 241 const void *buf, int count); 242 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num, 243 int nb_sectors, QEMUIOVector *qiov); 244 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num, 245 int nb_sectors, QEMUIOVector *qiov); 246 /* 247 * Efficiently zero a region of the disk image. Note that this is a regular 248 * I/O request like read or write and should have a reasonable size. This 249 * function is not suitable for zeroing the entire image in a single request 250 * because it may allocate memory for the entire region. 251 */ 252 int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, 253 int count, BdrvRequestFlags flags); 254 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 255 const char *backing_file); 256 int bdrv_get_backing_file_depth(BlockDriverState *bs); 257 void bdrv_refresh_filename(BlockDriverState *bs); 258 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 259 int64_t bdrv_nb_sectors(BlockDriverState *bs); 260 int64_t bdrv_getlength(BlockDriverState *bs); 261 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 262 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 263 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 264 int bdrv_commit(BlockDriverState *bs); 265 int bdrv_change_backing_file(BlockDriverState *bs, 266 const char *backing_file, const char *backing_fmt); 267 void bdrv_register(BlockDriver *bdrv); 268 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 269 BlockDriverState *base, 270 const char *backing_file_str); 271 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 272 BlockDriverState *bs); 273 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 274 275 276 typedef struct BdrvCheckResult { 277 int corruptions; 278 int leaks; 279 int check_errors; 280 int corruptions_fixed; 281 int leaks_fixed; 282 int64_t image_end_offset; 283 BlockFragInfo bfi; 284 } BdrvCheckResult; 285 286 typedef enum { 287 BDRV_FIX_LEAKS = 1, 288 BDRV_FIX_ERRORS = 2, 289 } BdrvCheckMode; 290 291 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 292 293 /* The units of offset and total_work_size may be chosen arbitrarily by the 294 * block driver; total_work_size may change during the course of the amendment 295 * operation */ 296 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 297 int64_t total_work_size, void *opaque); 298 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 299 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 300 301 /* external snapshots */ 302 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 303 BlockDriverState *candidate); 304 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 305 306 /* check if a named node can be replaced when doing drive-mirror */ 307 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 308 const char *node_name, Error **errp); 309 310 /* async block I/O */ 311 BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num, 312 QEMUIOVector *iov, int nb_sectors, 313 BlockCompletionFunc *cb, void *opaque); 314 BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num, 315 QEMUIOVector *iov, int nb_sectors, 316 BlockCompletionFunc *cb, void *opaque); 317 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 318 BlockCompletionFunc *cb, void *opaque); 319 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 320 int64_t sector_num, int nb_sectors, 321 BlockCompletionFunc *cb, void *opaque); 322 void bdrv_aio_cancel(BlockAIOCB *acb); 323 void bdrv_aio_cancel_async(BlockAIOCB *acb); 324 325 /* sg packet commands */ 326 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 327 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 328 unsigned long int req, void *buf, 329 BlockCompletionFunc *cb, void *opaque); 330 331 /* Invalidate any cached metadata used by image formats */ 332 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 333 void bdrv_invalidate_cache_all(Error **errp); 334 int bdrv_inactivate_all(void); 335 336 /* Ensure contents are flushed to disk. */ 337 int bdrv_flush(BlockDriverState *bs); 338 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 339 void bdrv_close_all(void); 340 void bdrv_drain(BlockDriverState *bs); 341 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 342 void bdrv_drain_all(void); 343 344 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 345 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 346 int bdrv_has_zero_init_1(BlockDriverState *bs); 347 int bdrv_has_zero_init(BlockDriverState *bs); 348 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 349 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 350 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 351 int nb_sectors, int *pnum, 352 BlockDriverState **file); 353 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 354 BlockDriverState *base, 355 int64_t sector_num, 356 int nb_sectors, int *pnum, 357 BlockDriverState **file); 358 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 359 int *pnum); 360 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 361 int64_t sector_num, int nb_sectors, int *pnum); 362 363 bool bdrv_is_read_only(BlockDriverState *bs); 364 bool bdrv_is_sg(BlockDriverState *bs); 365 bool bdrv_is_inserted(BlockDriverState *bs); 366 int bdrv_media_changed(BlockDriverState *bs); 367 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 368 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 369 const char *bdrv_get_format_name(BlockDriverState *bs); 370 BlockDriverState *bdrv_find_node(const char *node_name); 371 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 372 BlockDriverState *bdrv_lookup_bs(const char *device, 373 const char *node_name, 374 Error **errp); 375 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 376 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 377 378 typedef struct BdrvNextIterator { 379 enum { 380 BDRV_NEXT_BACKEND_ROOTS, 381 BDRV_NEXT_MONITOR_OWNED, 382 } phase; 383 BlockBackend *blk; 384 BlockDriverState *bs; 385 } BdrvNextIterator; 386 387 BlockDriverState *bdrv_first(BdrvNextIterator *it); 388 BlockDriverState *bdrv_next(BdrvNextIterator *it); 389 390 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 391 bool bdrv_is_encrypted(BlockDriverState *bs); 392 bool bdrv_key_required(BlockDriverState *bs); 393 int bdrv_set_key(BlockDriverState *bs, const char *key); 394 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 395 int bdrv_query_missing_keys(void); 396 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 397 void *opaque); 398 const char *bdrv_get_node_name(const BlockDriverState *bs); 399 const char *bdrv_get_device_name(const BlockDriverState *bs); 400 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 401 int bdrv_get_flags(BlockDriverState *bs); 402 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 403 const uint8_t *buf, int nb_sectors); 404 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 405 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 406 void bdrv_round_sectors_to_clusters(BlockDriverState *bs, 407 int64_t sector_num, int nb_sectors, 408 int64_t *cluster_sector_num, 409 int *cluster_nb_sectors); 410 void bdrv_round_to_clusters(BlockDriverState *bs, 411 int64_t offset, unsigned int bytes, 412 int64_t *cluster_offset, 413 unsigned int *cluster_bytes); 414 415 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 416 void bdrv_get_backing_filename(BlockDriverState *bs, 417 char *filename, int filename_size); 418 void bdrv_get_full_backing_filename(BlockDriverState *bs, 419 char *dest, size_t sz, Error **errp); 420 void bdrv_get_full_backing_filename_from_filename(const char *backed, 421 const char *backing, 422 char *dest, size_t sz, 423 Error **errp); 424 int bdrv_is_snapshot(BlockDriverState *bs); 425 426 int path_has_protocol(const char *path); 427 int path_is_absolute(const char *path); 428 void path_combine(char *dest, int dest_size, 429 const char *base_path, 430 const char *filename); 431 432 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 433 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 434 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 435 int64_t pos, int size); 436 437 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 438 int64_t pos, int size); 439 440 void bdrv_img_create(const char *filename, const char *fmt, 441 const char *base_filename, const char *base_fmt, 442 char *options, uint64_t img_size, int flags, 443 Error **errp, bool quiet); 444 445 /* Returns the alignment in bytes that is required so that no bounce buffer 446 * is required throughout the stack */ 447 size_t bdrv_min_mem_align(BlockDriverState *bs); 448 /* Returns optimal alignment in bytes for bounce buffer */ 449 size_t bdrv_opt_mem_align(BlockDriverState *bs); 450 void *qemu_blockalign(BlockDriverState *bs, size_t size); 451 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 452 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 453 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 454 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 455 456 void bdrv_enable_copy_on_read(BlockDriverState *bs); 457 void bdrv_disable_copy_on_read(BlockDriverState *bs); 458 459 void bdrv_ref(BlockDriverState *bs); 460 void bdrv_unref(BlockDriverState *bs); 461 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 462 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 463 BlockDriverState *child_bs, 464 const char *child_name, 465 const BdrvChildRole *child_role); 466 467 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 468 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 469 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 470 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 471 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 472 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 473 474 #define BLKDBG_EVENT(child, evt) \ 475 do { \ 476 if (child) { \ 477 bdrv_debug_event(child->bs, evt); \ 478 } \ 479 } while (0) 480 481 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 482 483 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 484 const char *tag); 485 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 486 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 487 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 488 489 /** 490 * bdrv_get_aio_context: 491 * 492 * Returns: the currently bound #AioContext 493 */ 494 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 495 496 /** 497 * bdrv_set_aio_context: 498 * 499 * Changes the #AioContext used for fd handlers, timers, and BHs by this 500 * BlockDriverState and all its children. 501 * 502 * This function must be called with iothread lock held. 503 */ 504 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 505 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 506 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 507 508 void bdrv_io_plug(BlockDriverState *bs); 509 void bdrv_io_unplug(BlockDriverState *bs); 510 void bdrv_io_unplugged_begin(BlockDriverState *bs); 511 void bdrv_io_unplugged_end(BlockDriverState *bs); 512 513 /** 514 * bdrv_drained_begin: 515 * 516 * Begin a quiesced section for exclusive access to the BDS, by disabling 517 * external request sources including NBD server and device model. Note that 518 * this doesn't block timers or coroutines from submitting more requests, which 519 * means block_job_pause is still necessary. 520 * 521 * This function can be recursive. 522 */ 523 void bdrv_drained_begin(BlockDriverState *bs); 524 525 /** 526 * bdrv_drained_end: 527 * 528 * End a quiescent section started by bdrv_drained_begin(). 529 */ 530 void bdrv_drained_end(BlockDriverState *bs); 531 532 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 533 Error **errp); 534 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 535 536 #endif 537