1 #ifndef BLOCK_H 2 #define BLOCK_H 3 4 #include "block/aio.h" 5 #include "qemu-common.h" 6 #include "qemu/option.h" 7 #include "qemu/coroutine.h" 8 #include "block/accounting.h" 9 #include "qapi/qmp/qobject.h" 10 #include "qapi-types.h" 11 12 /* block.c */ 13 typedef struct BlockDriver BlockDriver; 14 typedef struct BlockJob BlockJob; 15 typedef struct BdrvChild BdrvChild; 16 typedef struct BdrvChildRole BdrvChildRole; 17 typedef struct BlockJobTxn BlockJobTxn; 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 the driver can optimize writing zeroes by unmapping 32 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 33 * with the difference that in qemu a discard is allowed to silently 34 * fail. Therefore we have to use bdrv_write_zeroes with the 35 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 36 * After this call the driver has to guarantee that the contents read 37 * back as zero. It is additionally required that the block device is 38 * opened with BDRV_O_UNMAP flag for this to work. 39 */ 40 bool can_write_zeroes_with_unmap; 41 /* 42 * True if this block driver only supports compressed writes 43 */ 44 bool needs_compressed_writes; 45 } BlockDriverInfo; 46 47 typedef struct BlockFragInfo { 48 uint64_t allocated_clusters; 49 uint64_t total_clusters; 50 uint64_t fragmented_clusters; 51 uint64_t compressed_clusters; 52 } BlockFragInfo; 53 54 typedef enum { 55 BDRV_REQ_COPY_ON_READ = 0x1, 56 BDRV_REQ_ZERO_WRITE = 0x2, 57 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 58 * is allowed to optimize a write zeroes request by unmapping (discarding) 59 * blocks if it is guaranteed that the result will read back as 60 * zeroes. The flag is only passed to the driver if the block device is 61 * opened with BDRV_O_UNMAP. 62 */ 63 BDRV_REQ_MAY_UNMAP = 0x4, 64 BDRV_REQ_NO_SERIALISING = 0x8, 65 } BdrvRequestFlags; 66 67 typedef struct BlockSizes { 68 uint32_t phys; 69 uint32_t log; 70 } BlockSizes; 71 72 typedef struct HDGeometry { 73 uint32_t heads; 74 uint32_t sectors; 75 uint32_t cylinders; 76 } HDGeometry; 77 78 #define BDRV_O_RDWR 0x0002 79 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 80 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 81 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 82 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */ 83 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 84 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 85 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 86 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 87 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 88 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 89 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 90 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 91 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 92 select an appropriate protocol driver, 93 ignoring the format layer */ 94 95 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH) 96 97 98 /* Option names of options parsed by the block layer */ 99 100 #define BDRV_OPT_CACHE_WB "cache.writeback" 101 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 102 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 103 104 105 #define BDRV_SECTOR_BITS 9 106 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 107 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 108 109 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 110 INT_MAX >> BDRV_SECTOR_BITS) 111 112 /* 113 * Allocation status flags 114 * BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status. 115 * BDRV_BLOCK_ZERO: sectors read as zero 116 * BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by 117 * bdrv_get_block_status. 118 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 119 * layer (as opposed to the backing file) 120 * BDRV_BLOCK_RAW: used internally to indicate that the request 121 * was answered by the raw driver and that one 122 * should look in bs->file directly. 123 * 124 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 125 * bs->file where sector data can be read from as raw data. 126 * 127 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 128 * 129 * DATA ZERO OFFSET_VALID 130 * t t t sectors read as zero, bs->file is zero at offset 131 * t f t sectors read as valid from bs->file at offset 132 * f t t sectors preallocated, read as zero, bs->file not 133 * necessarily zero at offset 134 * f f t sectors preallocated but read from backing_hd, 135 * bs->file contains garbage at offset 136 * t t f sectors preallocated, read as zero, unknown offset 137 * t f f sectors read from unknown file or offset 138 * f t f not allocated or unknown offset, read as zero 139 * f f f not allocated or unknown offset, read from backing_hd 140 */ 141 #define BDRV_BLOCK_DATA 0x01 142 #define BDRV_BLOCK_ZERO 0x02 143 #define BDRV_BLOCK_OFFSET_VALID 0x04 144 #define BDRV_BLOCK_RAW 0x08 145 #define BDRV_BLOCK_ALLOCATED 0x10 146 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 147 148 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 149 150 typedef struct BDRVReopenState { 151 BlockDriverState *bs; 152 int flags; 153 QDict *options; 154 QDict *explicit_options; 155 void *opaque; 156 } BDRVReopenState; 157 158 /* 159 * Block operation types 160 */ 161 typedef enum BlockOpType { 162 BLOCK_OP_TYPE_BACKUP_SOURCE, 163 BLOCK_OP_TYPE_BACKUP_TARGET, 164 BLOCK_OP_TYPE_CHANGE, 165 BLOCK_OP_TYPE_COMMIT_SOURCE, 166 BLOCK_OP_TYPE_COMMIT_TARGET, 167 BLOCK_OP_TYPE_DATAPLANE, 168 BLOCK_OP_TYPE_DRIVE_DEL, 169 BLOCK_OP_TYPE_EJECT, 170 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 171 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 172 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 173 BLOCK_OP_TYPE_MIRROR_SOURCE, 174 BLOCK_OP_TYPE_MIRROR_TARGET, 175 BLOCK_OP_TYPE_RESIZE, 176 BLOCK_OP_TYPE_STREAM, 177 BLOCK_OP_TYPE_REPLACE, 178 BLOCK_OP_TYPE_MAX, 179 } BlockOpType; 180 181 void bdrv_info_print(Monitor *mon, const QObject *data); 182 void bdrv_info(Monitor *mon, QObject **ret_data); 183 void bdrv_stats_print(Monitor *mon, const QObject *data); 184 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 185 186 /* disk I/O throttling */ 187 void bdrv_io_limits_enable(BlockDriverState *bs, const char *group); 188 void bdrv_io_limits_disable(BlockDriverState *bs); 189 void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group); 190 191 void bdrv_init(void); 192 void bdrv_init_with_whitelist(void); 193 BlockDriver *bdrv_find_protocol(const char *filename, 194 bool allow_protocol_prefix, 195 Error **errp); 196 BlockDriver *bdrv_find_format(const char *format_name); 197 int bdrv_create(BlockDriver *drv, const char* filename, 198 QemuOpts *opts, Error **errp); 199 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 200 BlockDriverState *bdrv_new_root(void); 201 BlockDriverState *bdrv_new(void); 202 void bdrv_device_remove(BlockDriverState *bs); 203 void bdrv_make_anon(BlockDriverState *bs); 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_flags(const char *mode, int *flags); 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 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp); 219 int bdrv_open(BlockDriverState **pbs, const char *filename, 220 const char *reference, QDict *options, int flags, Error **errp); 221 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 222 BlockDriverState *bs, 223 QDict *options, int flags); 224 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 225 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 226 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 227 BlockReopenQueue *queue, Error **errp); 228 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 229 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 230 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 231 uint8_t *buf, int nb_sectors); 232 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, 233 uint8_t *buf, int nb_sectors); 234 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 235 const uint8_t *buf, int nb_sectors); 236 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 237 int nb_sectors, BdrvRequestFlags flags); 238 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 239 int nb_sectors, BdrvRequestFlags flags, 240 BlockCompletionFunc *cb, void *opaque); 241 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 242 int bdrv_pread(BlockDriverState *bs, int64_t offset, 243 void *buf, int count); 244 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 245 const void *buf, int count); 246 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 247 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 248 const void *buf, int count); 249 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 250 int nb_sectors, QEMUIOVector *qiov); 251 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 252 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 253 int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs, 254 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 255 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 256 int nb_sectors, QEMUIOVector *qiov); 257 /* 258 * Efficiently zero a region of the disk image. Note that this is a regular 259 * I/O request like read or write and should have a reasonable size. This 260 * function is not suitable for zeroing the entire image in a single request 261 * because it may allocate memory for the entire region. 262 */ 263 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 264 int nb_sectors, BdrvRequestFlags flags); 265 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 266 const char *backing_file); 267 int bdrv_get_backing_file_depth(BlockDriverState *bs); 268 void bdrv_refresh_filename(BlockDriverState *bs); 269 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 270 int64_t bdrv_nb_sectors(BlockDriverState *bs); 271 int64_t bdrv_getlength(BlockDriverState *bs); 272 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 273 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 274 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 275 int bdrv_commit(BlockDriverState *bs); 276 int bdrv_commit_all(void); 277 int bdrv_change_backing_file(BlockDriverState *bs, 278 const char *backing_file, const char *backing_fmt); 279 void bdrv_register(BlockDriver *bdrv); 280 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 281 BlockDriverState *base, 282 const char *backing_file_str); 283 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 284 BlockDriverState *bs); 285 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 286 287 288 typedef struct BdrvCheckResult { 289 int corruptions; 290 int leaks; 291 int check_errors; 292 int corruptions_fixed; 293 int leaks_fixed; 294 int64_t image_end_offset; 295 BlockFragInfo bfi; 296 } BdrvCheckResult; 297 298 typedef enum { 299 BDRV_FIX_LEAKS = 1, 300 BDRV_FIX_ERRORS = 2, 301 } BdrvCheckMode; 302 303 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 304 305 /* The units of offset and total_work_size may be chosen arbitrarily by the 306 * block driver; total_work_size may change during the course of the amendment 307 * operation */ 308 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 309 int64_t total_work_size, void *opaque); 310 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 311 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 312 313 /* external snapshots */ 314 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 315 BlockDriverState *candidate); 316 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 317 318 /* check if a named node can be replaced when doing drive-mirror */ 319 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 320 const char *node_name, Error **errp); 321 322 /* async block I/O */ 323 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector, 324 int sector_num); 325 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 326 QEMUIOVector *iov, int nb_sectors, 327 BlockCompletionFunc *cb, void *opaque); 328 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 329 QEMUIOVector *iov, int nb_sectors, 330 BlockCompletionFunc *cb, void *opaque); 331 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 332 BlockCompletionFunc *cb, void *opaque); 333 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 334 int64_t sector_num, int nb_sectors, 335 BlockCompletionFunc *cb, void *opaque); 336 void bdrv_aio_cancel(BlockAIOCB *acb); 337 void bdrv_aio_cancel_async(BlockAIOCB *acb); 338 339 typedef struct BlockRequest { 340 /* Fields to be filled by multiwrite caller */ 341 union { 342 struct { 343 int64_t sector; 344 int nb_sectors; 345 int flags; 346 QEMUIOVector *qiov; 347 }; 348 struct { 349 int req; 350 void *buf; 351 }; 352 }; 353 BlockCompletionFunc *cb; 354 void *opaque; 355 356 /* Filled by multiwrite implementation */ 357 int error; 358 } BlockRequest; 359 360 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 361 int num_reqs); 362 363 /* sg packet commands */ 364 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 365 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 366 unsigned long int req, void *buf, 367 BlockCompletionFunc *cb, void *opaque); 368 369 /* Invalidate any cached metadata used by image formats */ 370 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 371 void bdrv_invalidate_cache_all(Error **errp); 372 int bdrv_inactivate_all(void); 373 374 /* Ensure contents are flushed to disk. */ 375 int bdrv_flush(BlockDriverState *bs); 376 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 377 int bdrv_flush_all(void); 378 void bdrv_close_all(void); 379 void bdrv_drain(BlockDriverState *bs); 380 void bdrv_drain_all(void); 381 382 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 383 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 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 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 389 int nb_sectors, int *pnum, 390 BlockDriverState **file); 391 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 392 BlockDriverState *base, 393 int64_t sector_num, 394 int nb_sectors, int *pnum, 395 BlockDriverState **file); 396 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 397 int *pnum); 398 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 399 int64_t sector_num, int nb_sectors, int *pnum); 400 401 int bdrv_is_read_only(BlockDriverState *bs); 402 int bdrv_is_sg(BlockDriverState *bs); 403 int bdrv_enable_write_cache(BlockDriverState *bs); 404 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); 405 bool bdrv_is_inserted(BlockDriverState *bs); 406 int bdrv_media_changed(BlockDriverState *bs); 407 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 408 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 409 const char *bdrv_get_format_name(BlockDriverState *bs); 410 BlockDriverState *bdrv_find_node(const char *node_name); 411 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 412 BlockDriverState *bdrv_lookup_bs(const char *device, 413 const char *node_name, 414 Error **errp); 415 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 416 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 417 BlockDriverState *bdrv_next(BlockDriverState *bs); 418 int bdrv_is_encrypted(BlockDriverState *bs); 419 int bdrv_key_required(BlockDriverState *bs); 420 int bdrv_set_key(BlockDriverState *bs, const char *key); 421 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 422 int bdrv_query_missing_keys(void); 423 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 424 void *opaque); 425 const char *bdrv_get_node_name(const BlockDriverState *bs); 426 const char *bdrv_get_device_name(const BlockDriverState *bs); 427 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 428 int bdrv_get_flags(BlockDriverState *bs); 429 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 430 const uint8_t *buf, int nb_sectors); 431 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 432 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 433 void bdrv_round_to_clusters(BlockDriverState *bs, 434 int64_t sector_num, int nb_sectors, 435 int64_t *cluster_sector_num, 436 int *cluster_nb_sectors); 437 438 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 439 void bdrv_get_backing_filename(BlockDriverState *bs, 440 char *filename, int filename_size); 441 void bdrv_get_full_backing_filename(BlockDriverState *bs, 442 char *dest, size_t sz, Error **errp); 443 void bdrv_get_full_backing_filename_from_filename(const char *backed, 444 const char *backing, 445 char *dest, size_t sz, 446 Error **errp); 447 int bdrv_is_snapshot(BlockDriverState *bs); 448 449 int path_has_protocol(const char *path); 450 int path_is_absolute(const char *path); 451 void path_combine(char *dest, int dest_size, 452 const char *base_path, 453 const char *filename); 454 455 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 456 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 457 int64_t pos, int size); 458 459 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 460 int64_t pos, int size); 461 462 void bdrv_img_create(const char *filename, const char *fmt, 463 const char *base_filename, const char *base_fmt, 464 char *options, uint64_t img_size, int flags, 465 Error **errp, bool quiet); 466 467 /* Returns the alignment in bytes that is required so that no bounce buffer 468 * is required throughout the stack */ 469 size_t bdrv_min_mem_align(BlockDriverState *bs); 470 /* Returns optimal alignment in bytes for bounce buffer */ 471 size_t bdrv_opt_mem_align(BlockDriverState *bs); 472 void *qemu_blockalign(BlockDriverState *bs, size_t size); 473 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 474 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 475 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 476 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 477 478 struct HBitmapIter; 479 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap; 480 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, 481 uint32_t granularity, 482 const char *name, 483 Error **errp); 484 int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, 485 BdrvDirtyBitmap *bitmap, 486 Error **errp); 487 BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, 488 BdrvDirtyBitmap *bitmap, 489 Error **errp); 490 BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, 491 BdrvDirtyBitmap *bitmap, 492 Error **errp); 493 BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, 494 const char *name); 495 void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap); 496 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap); 497 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 498 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 499 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs); 500 uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs); 501 uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap); 502 bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap); 503 bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap); 504 DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap); 505 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector); 506 void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, 507 int64_t cur_sector, int nr_sectors); 508 void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, 509 int64_t cur_sector, int nr_sectors); 510 void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi); 511 void bdrv_set_dirty_iter(struct HBitmapIter *hbi, int64_t offset); 512 int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap); 513 514 void bdrv_enable_copy_on_read(BlockDriverState *bs); 515 void bdrv_disable_copy_on_read(BlockDriverState *bs); 516 517 void bdrv_ref(BlockDriverState *bs); 518 void bdrv_unref(BlockDriverState *bs); 519 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 520 521 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 522 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 523 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 524 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 525 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 526 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 527 528 #define BLKDBG_EVENT(child, evt) \ 529 do { \ 530 if (child) { \ 531 bdrv_debug_event(child->bs, evt); \ 532 } \ 533 } while (0) 534 535 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 536 537 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 538 const char *tag); 539 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 540 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 541 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 542 543 /** 544 * bdrv_get_aio_context: 545 * 546 * Returns: the currently bound #AioContext 547 */ 548 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 549 550 /** 551 * bdrv_set_aio_context: 552 * 553 * Changes the #AioContext used for fd handlers, timers, and BHs by this 554 * BlockDriverState and all its children. 555 * 556 * This function must be called with iothread lock held. 557 */ 558 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 559 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 560 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 561 562 void bdrv_io_plug(BlockDriverState *bs); 563 void bdrv_io_unplug(BlockDriverState *bs); 564 void bdrv_flush_io_queue(BlockDriverState *bs); 565 566 /** 567 * bdrv_drained_begin: 568 * 569 * Begin a quiesced section for exclusive access to the BDS, by disabling 570 * external request sources including NBD server and device model. Note that 571 * this doesn't block timers or coroutines from submitting more requests, which 572 * means block_job_pause is still necessary. 573 * 574 * This function can be recursive. 575 */ 576 void bdrv_drained_begin(BlockDriverState *bs); 577 578 /** 579 * bdrv_drained_end: 580 * 581 * End a quiescent section started by bdrv_drained_begin(). 582 */ 583 void bdrv_drained_end(BlockDriverState *bs); 584 585 #endif 586