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 "block/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 18 typedef struct BlockDriverInfo { 19 /* in bytes, 0 if irrelevant */ 20 int cluster_size; 21 /* offset at which the VM state can be saved (0 if not possible) */ 22 int64_t vm_state_offset; 23 bool is_dirty; 24 /* 25 * True if unallocated blocks read back as zeroes. This is equivalent 26 * to the LBPRZ flag in the SCSI logical block provisioning page. 27 */ 28 bool unallocated_blocks_are_zero; 29 /* 30 * True if the driver can optimize writing zeroes by unmapping 31 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 32 * with the difference that in qemu a discard is allowed to silently 33 * fail. Therefore we have to use bdrv_write_zeroes with the 34 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 35 * After this call the driver has to guarantee that the contents read 36 * back as zero. It is additionally required that the block device is 37 * opened with BDRV_O_UNMAP flag for this to work. 38 */ 39 bool can_write_zeroes_with_unmap; 40 /* 41 * True if this block driver only supports compressed writes 42 */ 43 bool needs_compressed_writes; 44 } BlockDriverInfo; 45 46 typedef struct BlockFragInfo { 47 uint64_t allocated_clusters; 48 uint64_t total_clusters; 49 uint64_t fragmented_clusters; 50 uint64_t compressed_clusters; 51 } BlockFragInfo; 52 53 typedef enum { 54 BDRV_REQ_COPY_ON_READ = 0x1, 55 BDRV_REQ_ZERO_WRITE = 0x2, 56 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 57 * is allowed to optimize a write zeroes request by unmapping (discarding) 58 * blocks if it is guaranteed that the result will read back as 59 * zeroes. The flag is only passed to the driver if the block device is 60 * opened with BDRV_O_UNMAP. 61 */ 62 BDRV_REQ_MAY_UNMAP = 0x4, 63 BDRV_REQ_NO_COPY_ON_READ = 0x8, 64 } BdrvRequestFlags; 65 66 typedef struct BlockSizes { 67 uint32_t phys; 68 uint32_t log; 69 } BlockSizes; 70 71 typedef struct HDGeometry { 72 uint32_t heads; 73 uint32_t sectors; 74 uint32_t cylinders; 75 } HDGeometry; 76 77 #define BDRV_O_RDWR 0x0002 78 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 79 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 80 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 81 #define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */ 82 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 83 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 84 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 85 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 86 #define BDRV_O_INCOMING 0x0800 /* consistency hint for incoming migration */ 87 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 88 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 89 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 90 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 91 select an appropriate protocol driver, 92 ignoring the format layer */ 93 94 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH) 95 96 97 /* Option names of options parsed by the block layer */ 98 99 #define BDRV_OPT_CACHE_WB "cache.writeback" 100 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 101 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 102 103 104 #define BDRV_SECTOR_BITS 9 105 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 106 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 107 108 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 109 INT_MAX >> BDRV_SECTOR_BITS) 110 111 /* 112 * Allocation status flags 113 * BDRV_BLOCK_DATA: data is read from bs->file or another file 114 * BDRV_BLOCK_ZERO: sectors read as zero 115 * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data 116 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 117 * layer (as opposed to the backing file) 118 * BDRV_BLOCK_RAW: used internally to indicate that the request 119 * was answered by the raw driver and that one 120 * should look in bs->file directly. 121 * 122 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in 123 * bs->file where sector data can be read from as raw data. 124 * 125 * DATA == 0 && ZERO == 0 means that data is read from backing_hd if present. 126 * 127 * DATA ZERO OFFSET_VALID 128 * t t t sectors read as zero, bs->file is zero at offset 129 * t f t sectors read as valid from bs->file at offset 130 * f t t sectors preallocated, read as zero, bs->file not 131 * necessarily zero at offset 132 * f f t sectors preallocated but read from backing_hd, 133 * bs->file contains garbage at offset 134 * t t f sectors preallocated, read as zero, unknown offset 135 * t f f sectors read from unknown file or offset 136 * f t f not allocated or unknown offset, read as zero 137 * f f f not allocated or unknown offset, read from backing_hd 138 */ 139 #define BDRV_BLOCK_DATA 0x01 140 #define BDRV_BLOCK_ZERO 0x02 141 #define BDRV_BLOCK_OFFSET_VALID 0x04 142 #define BDRV_BLOCK_RAW 0x08 143 #define BDRV_BLOCK_ALLOCATED 0x10 144 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 145 146 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 147 148 typedef struct BDRVReopenState { 149 BlockDriverState *bs; 150 int flags; 151 QDict *options; 152 void *opaque; 153 } BDRVReopenState; 154 155 /* 156 * Block operation types 157 */ 158 typedef enum BlockOpType { 159 BLOCK_OP_TYPE_BACKUP_SOURCE, 160 BLOCK_OP_TYPE_BACKUP_TARGET, 161 BLOCK_OP_TYPE_CHANGE, 162 BLOCK_OP_TYPE_COMMIT_SOURCE, 163 BLOCK_OP_TYPE_COMMIT_TARGET, 164 BLOCK_OP_TYPE_DATAPLANE, 165 BLOCK_OP_TYPE_DRIVE_DEL, 166 BLOCK_OP_TYPE_EJECT, 167 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 168 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 169 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 170 BLOCK_OP_TYPE_MIRROR, 171 BLOCK_OP_TYPE_RESIZE, 172 BLOCK_OP_TYPE_STREAM, 173 BLOCK_OP_TYPE_REPLACE, 174 BLOCK_OP_TYPE_MAX, 175 } BlockOpType; 176 177 void bdrv_iostatus_enable(BlockDriverState *bs); 178 void bdrv_iostatus_reset(BlockDriverState *bs); 179 void bdrv_iostatus_disable(BlockDriverState *bs); 180 bool bdrv_iostatus_is_enabled(const BlockDriverState *bs); 181 void bdrv_iostatus_set_err(BlockDriverState *bs, int error); 182 void bdrv_info_print(Monitor *mon, const QObject *data); 183 void bdrv_info(Monitor *mon, QObject **ret_data); 184 void bdrv_stats_print(Monitor *mon, const QObject *data); 185 void bdrv_info_stats(Monitor *mon, QObject **ret_data); 186 187 /* disk I/O throttling */ 188 void bdrv_io_limits_enable(BlockDriverState *bs, const char *group); 189 void bdrv_io_limits_disable(BlockDriverState *bs); 190 void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group); 191 192 void bdrv_init(void); 193 void bdrv_init_with_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_root(void); 202 BlockDriverState *bdrv_new(void); 203 void bdrv_make_anon(BlockDriverState *bs); 204 void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old); 205 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top); 206 int bdrv_parse_cache_flags(const char *mode, int *flags); 207 int bdrv_parse_discard_flags(const char *mode, int *flags); 208 int bdrv_open_image(BlockDriverState **pbs, const char *filename, 209 QDict *options, const char *bdref_key, 210 BlockDriverState* parent, const BdrvChildRole *child_role, 211 bool allow_none, Error **errp); 212 BdrvChild *bdrv_open_child(const char *filename, 213 QDict *options, const char *bdref_key, 214 BlockDriverState* parent, 215 const BdrvChildRole *child_role, 216 bool allow_none, Error **errp); 217 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd); 218 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp); 219 int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp); 220 int bdrv_open(BlockDriverState **pbs, const char *filename, 221 const char *reference, QDict *options, int flags, Error **errp); 222 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 223 BlockDriverState *bs, 224 QDict *options, int flags); 225 int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp); 226 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 227 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 228 BlockReopenQueue *queue, Error **errp); 229 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 230 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 231 void bdrv_close(BlockDriverState *bs); 232 void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify); 233 int bdrv_read(BlockDriverState *bs, int64_t sector_num, 234 uint8_t *buf, int nb_sectors); 235 int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, 236 uint8_t *buf, int nb_sectors); 237 int bdrv_write(BlockDriverState *bs, int64_t sector_num, 238 const uint8_t *buf, int nb_sectors); 239 int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, 240 int nb_sectors, BdrvRequestFlags flags); 241 BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num, 242 int nb_sectors, BdrvRequestFlags flags, 243 BlockCompletionFunc *cb, void *opaque); 244 int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags); 245 int bdrv_pread(BlockDriverState *bs, int64_t offset, 246 void *buf, int count); 247 int bdrv_pwrite(BlockDriverState *bs, int64_t offset, 248 const void *buf, int count); 249 int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov); 250 int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, 251 const void *buf, int count); 252 int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, 253 int nb_sectors, QEMUIOVector *qiov); 254 int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, 255 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 256 int coroutine_fn bdrv_co_no_copy_on_readv(BlockDriverState *bs, 257 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 258 int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 259 int nb_sectors, QEMUIOVector *qiov); 260 /* 261 * Efficiently zero a region of the disk image. Note that this is a regular 262 * I/O request like read or write and should have a reasonable size. This 263 * function is not suitable for zeroing the entire image in a single request 264 * because it may allocate memory for the entire region. 265 */ 266 int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, 267 int nb_sectors, BdrvRequestFlags flags); 268 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 269 const char *backing_file); 270 int bdrv_get_backing_file_depth(BlockDriverState *bs); 271 void bdrv_refresh_filename(BlockDriverState *bs); 272 int bdrv_truncate(BlockDriverState *bs, int64_t offset); 273 int64_t bdrv_nb_sectors(BlockDriverState *bs); 274 int64_t bdrv_getlength(BlockDriverState *bs); 275 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 276 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 277 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 278 int bdrv_commit(BlockDriverState *bs); 279 int bdrv_commit_all(void); 280 int bdrv_change_backing_file(BlockDriverState *bs, 281 const char *backing_file, const char *backing_fmt); 282 void bdrv_register(BlockDriver *bdrv); 283 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 284 BlockDriverState *base, 285 const char *backing_file_str); 286 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 287 BlockDriverState *bs); 288 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 289 290 291 typedef struct BdrvCheckResult { 292 int corruptions; 293 int leaks; 294 int check_errors; 295 int corruptions_fixed; 296 int leaks_fixed; 297 int64_t image_end_offset; 298 BlockFragInfo bfi; 299 } BdrvCheckResult; 300 301 typedef enum { 302 BDRV_FIX_LEAKS = 1, 303 BDRV_FIX_ERRORS = 2, 304 } BdrvCheckMode; 305 306 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 307 308 /* The units of offset and total_work_size may be chosen arbitrarily by the 309 * block driver; total_work_size may change during the course of the amendment 310 * operation */ 311 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 312 int64_t total_work_size); 313 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 314 BlockDriverAmendStatusCB *status_cb); 315 316 /* external snapshots */ 317 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 318 BlockDriverState *candidate); 319 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 320 321 /* check if a named node can be replaced when doing drive-mirror */ 322 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 323 const char *node_name, Error **errp); 324 325 /* async block I/O */ 326 typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector, 327 int sector_num); 328 BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, 329 QEMUIOVector *iov, int nb_sectors, 330 BlockCompletionFunc *cb, void *opaque); 331 BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, 332 QEMUIOVector *iov, int nb_sectors, 333 BlockCompletionFunc *cb, void *opaque); 334 BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs, 335 BlockCompletionFunc *cb, void *opaque); 336 BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs, 337 int64_t sector_num, int nb_sectors, 338 BlockCompletionFunc *cb, void *opaque); 339 void bdrv_aio_cancel(BlockAIOCB *acb); 340 void bdrv_aio_cancel_async(BlockAIOCB *acb); 341 342 typedef struct BlockRequest { 343 /* Fields to be filled by multiwrite caller */ 344 int64_t sector; 345 int nb_sectors; 346 int flags; 347 QEMUIOVector *qiov; 348 BlockCompletionFunc *cb; 349 void *opaque; 350 351 /* Filled by multiwrite implementation */ 352 int error; 353 } BlockRequest; 354 355 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, 356 int num_reqs); 357 358 /* sg packet commands */ 359 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf); 360 BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, 361 unsigned long int req, void *buf, 362 BlockCompletionFunc *cb, void *opaque); 363 364 /* Invalidate any cached metadata used by image formats */ 365 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 366 void bdrv_invalidate_cache_all(Error **errp); 367 368 /* Ensure contents are flushed to disk. */ 369 int bdrv_flush(BlockDriverState *bs); 370 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 371 int bdrv_flush_all(void); 372 void bdrv_close_all(void); 373 void bdrv_drain(BlockDriverState *bs); 374 void bdrv_drain_all(void); 375 376 int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 377 int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 378 int bdrv_has_zero_init_1(BlockDriverState *bs); 379 int bdrv_has_zero_init(BlockDriverState *bs); 380 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 381 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 382 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 383 int nb_sectors, int *pnum); 384 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 385 BlockDriverState *base, 386 int64_t sector_num, 387 int nb_sectors, int *pnum); 388 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 389 int *pnum); 390 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 391 int64_t sector_num, int nb_sectors, int *pnum); 392 393 void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, 394 BlockdevOnError on_write_error); 395 BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read); 396 BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error); 397 void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, 398 bool is_read, int error); 399 int bdrv_is_read_only(BlockDriverState *bs); 400 int bdrv_is_sg(BlockDriverState *bs); 401 int bdrv_enable_write_cache(BlockDriverState *bs); 402 void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce); 403 int bdrv_is_inserted(BlockDriverState *bs); 404 int bdrv_media_changed(BlockDriverState *bs); 405 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 406 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 407 const char *bdrv_get_format_name(BlockDriverState *bs); 408 BlockDriverState *bdrv_find_node(const char *node_name); 409 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 410 BlockDriverState *bdrv_lookup_bs(const char *device, 411 const char *node_name, 412 Error **errp); 413 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 414 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 415 BlockDriverState *bdrv_next(BlockDriverState *bs); 416 int bdrv_is_encrypted(BlockDriverState *bs); 417 int bdrv_key_required(BlockDriverState *bs); 418 int bdrv_set_key(BlockDriverState *bs, const char *key); 419 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 420 int bdrv_query_missing_keys(void); 421 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 422 void *opaque); 423 const char *bdrv_get_node_name(const BlockDriverState *bs); 424 const char *bdrv_get_device_name(const BlockDriverState *bs); 425 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 426 int bdrv_get_flags(BlockDriverState *bs); 427 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, 428 const uint8_t *buf, int nb_sectors); 429 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 430 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 431 void bdrv_round_to_clusters(BlockDriverState *bs, 432 int64_t sector_num, int nb_sectors, 433 int64_t *cluster_sector_num, 434 int *cluster_nb_sectors); 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 int bdrv_is_snapshot(BlockDriverState *bs); 446 447 int path_has_protocol(const char *path); 448 int path_is_absolute(const char *path); 449 void path_combine(char *dest, int dest_size, 450 const char *base_path, 451 const char *filename); 452 453 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 bdrv_set_guest_block_size(BlockDriverState *bs, int align); 471 void *qemu_blockalign(BlockDriverState *bs, size_t size); 472 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 473 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 474 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 475 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 476 477 struct HBitmapIter; 478 typedef struct BdrvDirtyBitmap BdrvDirtyBitmap; 479 BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, 480 uint32_t granularity, 481 const char *name, 482 Error **errp); 483 int bdrv_dirty_bitmap_create_successor(BlockDriverState *bs, 484 BdrvDirtyBitmap *bitmap, 485 Error **errp); 486 BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs, 487 BdrvDirtyBitmap *bitmap, 488 Error **errp); 489 BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs, 490 BdrvDirtyBitmap *bitmap, 491 Error **errp); 492 BdrvDirtyBitmap *bdrv_find_dirty_bitmap(BlockDriverState *bs, 493 const char *name); 494 void bdrv_dirty_bitmap_make_anon(BdrvDirtyBitmap *bitmap); 495 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap); 496 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 497 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap); 498 BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs); 499 uint32_t bdrv_get_default_bitmap_granularity(BlockDriverState *bs); 500 uint32_t bdrv_dirty_bitmap_granularity(BdrvDirtyBitmap *bitmap); 501 bool bdrv_dirty_bitmap_enabled(BdrvDirtyBitmap *bitmap); 502 bool bdrv_dirty_bitmap_frozen(BdrvDirtyBitmap *bitmap); 503 DirtyBitmapStatus bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap); 504 int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector); 505 void bdrv_set_dirty_bitmap(BdrvDirtyBitmap *bitmap, 506 int64_t cur_sector, int nr_sectors); 507 void bdrv_reset_dirty_bitmap(BdrvDirtyBitmap *bitmap, 508 int64_t cur_sector, int nr_sectors); 509 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap); 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 typedef enum { 529 BLKDBG_L1_UPDATE, 530 531 BLKDBG_L1_GROW_ALLOC_TABLE, 532 BLKDBG_L1_GROW_WRITE_TABLE, 533 BLKDBG_L1_GROW_ACTIVATE_TABLE, 534 535 BLKDBG_L2_LOAD, 536 BLKDBG_L2_UPDATE, 537 BLKDBG_L2_UPDATE_COMPRESSED, 538 BLKDBG_L2_ALLOC_COW_READ, 539 BLKDBG_L2_ALLOC_WRITE, 540 541 BLKDBG_READ_AIO, 542 BLKDBG_READ_BACKING_AIO, 543 BLKDBG_READ_COMPRESSED, 544 545 BLKDBG_WRITE_AIO, 546 BLKDBG_WRITE_COMPRESSED, 547 548 BLKDBG_VMSTATE_LOAD, 549 BLKDBG_VMSTATE_SAVE, 550 551 BLKDBG_COW_READ, 552 BLKDBG_COW_WRITE, 553 554 BLKDBG_REFTABLE_LOAD, 555 BLKDBG_REFTABLE_GROW, 556 BLKDBG_REFTABLE_UPDATE, 557 558 BLKDBG_REFBLOCK_LOAD, 559 BLKDBG_REFBLOCK_UPDATE, 560 BLKDBG_REFBLOCK_UPDATE_PART, 561 BLKDBG_REFBLOCK_ALLOC, 562 BLKDBG_REFBLOCK_ALLOC_HOOKUP, 563 BLKDBG_REFBLOCK_ALLOC_WRITE, 564 BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS, 565 BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE, 566 BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE, 567 568 BLKDBG_CLUSTER_ALLOC, 569 BLKDBG_CLUSTER_ALLOC_BYTES, 570 BLKDBG_CLUSTER_FREE, 571 572 BLKDBG_FLUSH_TO_OS, 573 BLKDBG_FLUSH_TO_DISK, 574 575 BLKDBG_PWRITEV_RMW_HEAD, 576 BLKDBG_PWRITEV_RMW_AFTER_HEAD, 577 BLKDBG_PWRITEV_RMW_TAIL, 578 BLKDBG_PWRITEV_RMW_AFTER_TAIL, 579 BLKDBG_PWRITEV, 580 BLKDBG_PWRITEV_ZERO, 581 BLKDBG_PWRITEV_DONE, 582 583 BLKDBG_EMPTY_IMAGE_PREPARE, 584 585 BLKDBG_EVENT_MAX, 586 } BlkDebugEvent; 587 588 #define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt) 589 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event); 590 591 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 592 const char *tag); 593 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 594 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 595 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 596 597 /** 598 * bdrv_get_aio_context: 599 * 600 * Returns: the currently bound #AioContext 601 */ 602 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 603 604 /** 605 * bdrv_set_aio_context: 606 * 607 * Changes the #AioContext used for fd handlers, timers, and BHs by this 608 * BlockDriverState and all its children. 609 * 610 * This function must be called with iothread lock held. 611 */ 612 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 613 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 614 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 615 616 void bdrv_io_plug(BlockDriverState *bs); 617 void bdrv_io_unplug(BlockDriverState *bs); 618 void bdrv_flush_io_queue(BlockDriverState *bs); 619 620 BlockAcctStats *bdrv_get_stats(BlockDriverState *bs); 621 622 #endif 623