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_INCOMING 0x0800 /* consistency hint for incoming migration */ 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 bs->file or another file 115 * BDRV_BLOCK_ZERO: sectors read as zero 116 * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data 117 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 118 * layer (as opposed to the backing file) 119 * BDRV_BLOCK_RAW: used internally to indicate that the request 120 * was answered by the raw driver and that one 121 * should look in bs->file directly. 122 * 123 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 124 * bs->file where sector data can be read from as raw data. 125 * 126 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 127 * 128 * DATA ZERO OFFSET_VALID 129 * t t t sectors read as zero, bs->file is zero at offset 130 * t f t sectors read as valid from bs->file at offset 131 * f t t sectors preallocated, read as zero, bs->file not 132 * necessarily zero at offset 133 * f f t sectors preallocated but read from backing_hd, 134 * bs->file contains garbage at offset 135 * t t f sectors preallocated, read as zero, unknown offset 136 * t f f sectors read from unknown file or offset 137 * f t f not allocated or unknown offset, read as zero 138 * f f f not allocated or unknown offset, read from backing_hd 139 */ 140 #define BDRV_BLOCK_DATA 0x01 141 #define BDRV_BLOCK_ZERO 0x02 142 #define BDRV_BLOCK_OFFSET_VALID 0x04 143 #define BDRV_BLOCK_RAW 0x08 144 #define BDRV_BLOCK_ALLOCATED 0x10 145 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 146 147 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 148 149 typedef struct BDRVReopenState { 150 BlockDriverState *bs; 151 int flags; 152 QDict *options; 153 QDict *explicit_options; 154 void *opaque; 155 } BDRVReopenState; 156 157 /* 158 * Block operation types 159 */ 160 typedef enum BlockOpType { 161 BLOCK_OP_TYPE_BACKUP_SOURCE, 162 BLOCK_OP_TYPE_BACKUP_TARGET, 163 BLOCK_OP_TYPE_CHANGE, 164 BLOCK_OP_TYPE_COMMIT_SOURCE, 165 BLOCK_OP_TYPE_COMMIT_TARGET, 166 BLOCK_OP_TYPE_DATAPLANE, 167 BLOCK_OP_TYPE_DRIVE_DEL, 168 BLOCK_OP_TYPE_EJECT, 169 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 170 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 171 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 172 BLOCK_OP_TYPE_MIRROR, 173 BLOCK_OP_TYPE_RESIZE, 174 BLOCK_OP_TYPE_STREAM, 175 BLOCK_OP_TYPE_REPLACE, 176 BLOCK_OP_TYPE_MAX, 177 } BlockOpType; 178 179 void bdrv_info_print(Monitor *mon, const QObject *data); 180 void bdrv_info(Monitor *mon, QObject **ret_data); 181 void bdrv_stats_print(Monitor *mon, const QObject *data); 182 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 183 184 /* disk I/O throttling */ 185 void bdrv_io_limits_enable(BlockDriverState *bs, const char *group); 186 void bdrv_io_limits_disable(BlockDriverState *bs); 187 void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group); 188 189 void bdrv_init(void); 190 void bdrv_init_with_whitelist(void); 191 BlockDriver *bdrv_find_protocol(const char *filename, 192 bool allow_protocol_prefix, 193 Error **errp); 194 BlockDriver *bdrv_find_format(const char *format_name); 195 int bdrv_create(BlockDriver *drv, const char* filename, 196 QemuOpts *opts, Error **errp); 197 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 198 BlockDriverState *bdrv_new_root(void); 199 BlockDriverState *bdrv_new(void); 200 void bdrv_make_anon(BlockDriverState *bs); 201 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 202 void bdrv_replace_in_backing_chain(BlockDriverState *old, 203 BlockDriverState *new); 204 205 int bdrv_parse_cache_flags(const char *mode, int *flags); 206 int bdrv_parse_discard_flags(const char *mode, int *flags); 207 BdrvChild *bdrv_open_child(const char *filename, 208 QDict *options, const char *bdref_key, 209 BlockDriverState* parent, 210 const BdrvChildRole *child_role, 211 bool allow_none, Error **errp); 212 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 213 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 214 const char *bdref_key, Error **errp); 215 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp); 216 int bdrv_open(BlockDriverState **pbs, const char *filename, 217 const char *reference, 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(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 void bdrv_close(BlockDriverState *bs); 228 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify); 229 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 230 uint8_t *buf, int nb_sectors); 231 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, 232 uint8_t *buf, int nb_sectors); 233 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 234 const uint8_t *buf, int nb_sectors); 235 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 236 int nb_sectors, BdrvRequestFlags flags); 237 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 238 int nb_sectors, BdrvRequestFlags flags, 239 BlockCompletionFunc *cb, void *opaque); 240 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 241 int bdrv_pread(BlockDriverState *bs, int64_t offset, 242 void *buf, int count); 243 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 244 const void *buf, int count); 245 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 246 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 247 const void *buf, int count); 248 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 249 int nb_sectors, QEMUIOVector *qiov); 250 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 251 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 252 int coroutine_fn bdrv_co_readv_no_serialising(BlockDriverState *bs, 253 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 254 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 255 int nb_sectors, QEMUIOVector *qiov); 256 /* 257 * Efficiently zero a region of the disk image. Note that this is a regular 258 * I/O request like read or write and should have a reasonable size. This 259 * function is not suitable for zeroing the entire image in a single request 260 * because it may allocate memory for the entire region. 261 */ 262 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 263 int nb_sectors, BdrvRequestFlags flags); 264 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 265 const char *backing_file); 266 int bdrv_get_backing_file_depth(BlockDriverState *bs); 267 void bdrv_refresh_filename(BlockDriverState *bs); 268 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 269 int64_t bdrv_nb_sectors(BlockDriverState *bs); 270 int64_t bdrv_getlength(BlockDriverState *bs); 271 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 272 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 273 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 274 int bdrv_commit(BlockDriverState *bs); 275 int bdrv_commit_all(void); 276 int bdrv_change_backing_file(BlockDriverState *bs, 277 const char *backing_file, const char *backing_fmt); 278 void bdrv_register(BlockDriver *bdrv); 279 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 280 BlockDriverState *base, 281 const char *backing_file_str); 282 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 283 BlockDriverState *bs); 284 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 285 286 287 typedef struct BdrvCheckResult { 288 int corruptions; 289 int leaks; 290 int check_errors; 291 int corruptions_fixed; 292 int leaks_fixed; 293 int64_t image_end_offset; 294 BlockFragInfo bfi; 295 } BdrvCheckResult; 296 297 typedef enum { 298 BDRV_FIX_LEAKS = 1, 299 BDRV_FIX_ERRORS = 2, 300 } BdrvCheckMode; 301 302 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 303 304 /* The units of offset and total_work_size may be chosen arbitrarily by the 305 * block driver; total_work_size may change during the course of the amendment 306 * operation */ 307 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 308 int64_t total_work_size, void *opaque); 309 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 310 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 311 312 /* external snapshots */ 313 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 314 BlockDriverState *candidate); 315 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 316 317 /* check if a named node can be replaced when doing drive-mirror */ 318 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 319 const char *node_name, Error **errp); 320 321 /* async block I/O */ 322 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector, 323 int sector_num); 324 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 325 QEMUIOVector *iov, int nb_sectors, 326 BlockCompletionFunc *cb, void *opaque); 327 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 328 QEMUIOVector *iov, int nb_sectors, 329 BlockCompletionFunc *cb, void *opaque); 330 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 331 BlockCompletionFunc *cb, void *opaque); 332 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 333 int64_t sector_num, int nb_sectors, 334 BlockCompletionFunc *cb, void *opaque); 335 void bdrv_aio_cancel(BlockAIOCB *acb); 336 void bdrv_aio_cancel_async(BlockAIOCB *acb); 337 338 typedef struct BlockRequest { 339 /* Fields to be filled by multiwrite caller */ 340 union { 341 struct { 342 int64_t sector; 343 int nb_sectors; 344 int flags; 345 QEMUIOVector *qiov; 346 }; 347 struct { 348 int req; 349 void *buf; 350 }; 351 }; 352 BlockCompletionFunc *cb; 353 void *opaque; 354 355 /* Filled by multiwrite implementation */ 356 int error; 357 } BlockRequest; 358 359 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 360 int num_reqs); 361 362 /* sg packet commands */ 363 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 364 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 365 unsigned long int req, void *buf, 366 BlockCompletionFunc *cb, void *opaque); 367 368 /* Invalidate any cached metadata used by image formats */ 369 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 370 void bdrv_invalidate_cache_all(Error **errp); 371 372 /* Ensure contents are flushed to disk. */ 373 int bdrv_flush(BlockDriverState *bs); 374 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 375 int bdrv_flush_all(void); 376 void bdrv_close_all(void); 377 void bdrv_drain(BlockDriverState *bs); 378 void bdrv_drain_all(void); 379 380 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 381 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 382 int bdrv_has_zero_init_1(BlockDriverState *bs); 383 int bdrv_has_zero_init(BlockDriverState *bs); 384 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 385 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 386 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 387 int nb_sectors, int *pnum); 388 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 389 BlockDriverState *base, 390 int64_t sector_num, 391 int nb_sectors, int *pnum); 392 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 393 int *pnum); 394 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 395 int64_t sector_num, int nb_sectors, int *pnum); 396 397 int bdrv_is_read_only(BlockDriverState *bs); 398 int bdrv_is_sg(BlockDriverState *bs); 399 int bdrv_enable_write_cache(BlockDriverState *bs); 400 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); 401 bool bdrv_is_inserted(BlockDriverState *bs); 402 int bdrv_media_changed(BlockDriverState *bs); 403 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 404 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 405 const char *bdrv_get_format_name(BlockDriverState *bs); 406 BlockDriverState *bdrv_find_node(const char *node_name); 407 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 408 BlockDriverState *bdrv_lookup_bs(const char *device, 409 const char *node_name, 410 Error **errp); 411 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 412 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 413 BlockDriverState *bdrv_next(BlockDriverState *bs); 414 int bdrv_is_encrypted(BlockDriverState *bs); 415 int bdrv_key_required(BlockDriverState *bs); 416 int bdrv_set_key(BlockDriverState *bs, const char *key); 417 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 418 int bdrv_query_missing_keys(void); 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_write_compressed(BlockDriverState *bs, int64_t sector_num, 426 const uint8_t *buf, int nb_sectors); 427 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 428 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 429 void bdrv_round_to_clusters(BlockDriverState *bs, 430 int64_t sector_num, int nb_sectors, 431 int64_t *cluster_sector_num, 432 int *cluster_nb_sectors); 433 434 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 435 void bdrv_get_backing_filename(BlockDriverState *bs, 436 char *filename, int filename_size); 437 void bdrv_get_full_backing_filename(BlockDriverState *bs, 438 char *dest, size_t sz, Error **errp); 439 void bdrv_get_full_backing_filename_from_filename(const char *backed, 440 const char *backing, 441 char *dest, size_t sz, 442 Error **errp); 443 int bdrv_is_snapshot(BlockDriverState *bs); 444 445 int path_has_protocol(const char *path); 446 int path_is_absolute(const char *path); 447 void path_combine(char *dest, int dest_size, 448 const char *base_path, 449 const char *filename); 450 451 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 452 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 453 int64_t pos, int size); 454 455 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 456 int64_t pos, int size); 457 458 void bdrv_img_create(const char *filename, const char *fmt, 459 const char *base_filename, const char *base_fmt, 460 char *options, uint64_t img_size, int flags, 461 Error **errp, bool quiet); 462 463 /* Returns the alignment in bytes that is required so that no bounce buffer 464 * is required throughout the stack */ 465 size_t bdrv_min_mem_align(BlockDriverState *bs); 466 /* Returns optimal alignment in bytes for bounce buffer */ 467 size_t bdrv_opt_mem_align(BlockDriverState *bs); 468 void *qemu_blockalign(BlockDriverState *bs, size_t size); 469 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 470 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 471 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 472 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 473 474 struct HBitmapIter; 475 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap; 476 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, 477 uint32_t granularity, 478 const char *name, 479 Error **errp); 480 int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, 481 BdrvDirtyBitmap *bitmap, 482 Error **errp); 483 BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, 484 BdrvDirtyBitmap *bitmap, 485 Error **errp); 486 BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, 487 BdrvDirtyBitmap *bitmap, 488 Error **errp); 489 BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, 490 const char *name); 491 void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap); 492 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap); 493 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 494 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 495 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs); 496 uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs); 497 uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap); 498 bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap); 499 bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap); 500 DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap); 501 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector); 502 void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, 503 int64_t cur_sector, int nr_sectors); 504 void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, 505 int64_t cur_sector, int nr_sectors); 506 void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi); 507 void bdrv_set_dirty_iter(struct HBitmapIter *hbi, int64_t offset); 508 int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap); 509 510 void bdrv_enable_copy_on_read(BlockDriverState *bs); 511 void bdrv_disable_copy_on_read(BlockDriverState *bs); 512 513 void bdrv_ref(BlockDriverState *bs); 514 void bdrv_unref(BlockDriverState *bs); 515 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 516 517 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 518 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 519 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 520 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 521 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 522 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 523 524 #define BLKDBG_EVENT(child, evt) \ 525 do { \ 526 if (child) { \ 527 bdrv_debug_event(child->bs, evt); \ 528 } \ 529 } while (0) 530 531 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 532 533 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 534 const char *tag); 535 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 536 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 537 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 538 539 /** 540 * bdrv_get_aio_context: 541 * 542 * Returns: the currently bound #AioContext 543 */ 544 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 545 546 /** 547 * bdrv_set_aio_context: 548 * 549 * Changes the #AioContext used for fd handlers, timers, and BHs by this 550 * BlockDriverState and all its children. 551 * 552 * This function must be called with iothread lock held. 553 */ 554 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 555 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 556 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 557 558 void bdrv_io_plug(BlockDriverState *bs); 559 void bdrv_io_unplug(BlockDriverState *bs); 560 void bdrv_flush_io_queue(BlockDriverState *bs); 561 562 /** 563 * bdrv_drained_begin: 564 * 565 * Begin a quiesced section for exclusive access to the BDS, by disabling 566 * external request sources including NBD server and device model. Note that 567 * this doesn't block timers or coroutines from submitting more requests, which 568 * means block_job_pause is still necessary. 569 * 570 * This function can be recursive. 571 */ 572 void bdrv_drained_begin(BlockDriverState *bs); 573 574 /** 575 * bdrv_drained_end: 576 * 577 * End a quiescent section started by bdrv_drained_begin(). 578 */ 579 void bdrv_drained_end(BlockDriverState *bs); 580 581 #endif 582