1 #ifndef BLOCK_H 2 #define BLOCK_H 3 4 #include "block/aio.h" 5 #include "qemu/iov.h" 6 #include "qemu/option.h" 7 #include "qemu/coroutine.h" 8 #include "block/accounting.h" 9 #include "block/dirty-bitmap.h" 10 #include "block/blockjob.h" 11 #include "qapi/qmp/qobject.h" 12 #include "qapi-types.h" 13 #include "qemu/hbitmap.h" 14 15 /* block.c */ 16 typedef struct BlockDriver BlockDriver; 17 typedef struct BdrvChild BdrvChild; 18 typedef struct BdrvChildRole BdrvChildRole; 19 20 typedef struct BlockDriverInfo { 21 /* in bytes, 0 if irrelevant */ 22 int cluster_size; 23 /* offset at which the VM state can be saved (0 if not possible) */ 24 int64_t vm_state_offset; 25 bool is_dirty; 26 /* 27 * True if unallocated blocks read back as zeroes. This is equivalent 28 * to the LBPRZ flag in the SCSI logical block provisioning page. 29 */ 30 bool unallocated_blocks_are_zero; 31 /* 32 * True if the driver can optimize writing zeroes by unmapping 33 * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux 34 * with the difference that in qemu a discard is allowed to silently 35 * fail. Therefore we have to use bdrv_pwrite_zeroes with the 36 * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping. 37 * After this call the driver has to guarantee that the contents read 38 * back as zero. It is additionally required that the block device is 39 * opened with BDRV_O_UNMAP flag for this to work. 40 */ 41 bool can_write_zeroes_with_unmap; 42 /* 43 * True if this block driver only supports compressed writes 44 */ 45 bool needs_compressed_writes; 46 } BlockDriverInfo; 47 48 typedef struct BlockFragInfo { 49 uint64_t allocated_clusters; 50 uint64_t total_clusters; 51 uint64_t fragmented_clusters; 52 uint64_t compressed_clusters; 53 } BlockFragInfo; 54 55 typedef enum { 56 BDRV_REQ_COPY_ON_READ = 0x1, 57 BDRV_REQ_ZERO_WRITE = 0x2, 58 /* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver 59 * is allowed to optimize a write zeroes request by unmapping (discarding) 60 * blocks if it is guaranteed that the result will read back as 61 * zeroes. The flag is only passed to the driver if the block device is 62 * opened with BDRV_O_UNMAP. 63 */ 64 BDRV_REQ_MAY_UNMAP = 0x4, 65 BDRV_REQ_NO_SERIALISING = 0x8, 66 BDRV_REQ_FUA = 0x10, 67 BDRV_REQ_WRITE_COMPRESSED = 0x20, 68 69 /* Mask of valid flags */ 70 BDRV_REQ_MASK = 0x3f, 71 } BdrvRequestFlags; 72 73 typedef struct BlockSizes { 74 uint32_t phys; 75 uint32_t log; 76 } BlockSizes; 77 78 typedef struct HDGeometry { 79 uint32_t heads; 80 uint32_t sectors; 81 uint32_t cylinders; 82 } HDGeometry; 83 84 #define BDRV_O_RDWR 0x0002 85 #define BDRV_O_RESIZE 0x0004 /* request permission for resizing the node */ 86 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ 87 #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ 88 #define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */ 89 #define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */ 90 #define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */ 91 #define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */ 92 #define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */ 93 #define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */ 94 #define BDRV_O_CHECK 0x1000 /* open solely for consistency check */ 95 #define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */ 96 #define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */ 97 #define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given: 98 select an appropriate protocol driver, 99 ignoring the format layer */ 100 #define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */ 101 102 #define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH) 103 104 105 /* Option names of options parsed by the block layer */ 106 107 #define BDRV_OPT_CACHE_WB "cache.writeback" 108 #define BDRV_OPT_CACHE_DIRECT "cache.direct" 109 #define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush" 110 #define BDRV_OPT_READ_ONLY "read-only" 111 #define BDRV_OPT_DISCARD "discard" 112 #define BDRV_OPT_FORCE_SHARE "force-share" 113 114 115 #define BDRV_SECTOR_BITS 9 116 #define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS) 117 #define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1) 118 119 #define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \ 120 INT_MAX >> BDRV_SECTOR_BITS) 121 #define BDRV_REQUEST_MAX_BYTES (BDRV_REQUEST_MAX_SECTORS << BDRV_SECTOR_BITS) 122 123 /* 124 * Allocation status flags for bdrv_get_block_status() and friends. 125 * 126 * Public flags: 127 * BDRV_BLOCK_DATA: allocation for data at offset is tied to this layer 128 * BDRV_BLOCK_ZERO: offset reads as zero 129 * BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data 130 * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this 131 * layer (short for DATA || ZERO), set by block layer 132 * 133 * Internal flag: 134 * BDRV_BLOCK_RAW: used internally to indicate that the request was 135 * answered by a passthrough driver such as raw and that the 136 * block layer should recompute the answer from bs->file. 137 * 138 * If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 (BDRV_BLOCK_OFFSET_MASK) 139 * represent the offset in the returned BDS that is allocated for the 140 * corresponding raw data; however, whether that offset actually contains 141 * data also depends on BDRV_BLOCK_DATA and BDRV_BLOCK_ZERO, as follows: 142 * 143 * DATA ZERO OFFSET_VALID 144 * t t t sectors read as zero, returned file is zero at offset 145 * t f t sectors read as valid from file at offset 146 * f t t sectors preallocated, read as zero, returned file not 147 * necessarily zero at offset 148 * f f t sectors preallocated but read from backing_hd, 149 * returned file contains garbage at offset 150 * t t f sectors preallocated, read as zero, unknown offset 151 * t f f sectors read from unknown file or offset 152 * f t f not allocated or unknown offset, read as zero 153 * f f f not allocated or unknown offset, read from backing_hd 154 */ 155 #define BDRV_BLOCK_DATA 0x01 156 #define BDRV_BLOCK_ZERO 0x02 157 #define BDRV_BLOCK_OFFSET_VALID 0x04 158 #define BDRV_BLOCK_RAW 0x08 159 #define BDRV_BLOCK_ALLOCATED 0x10 160 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK 161 162 typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; 163 164 typedef struct BDRVReopenState { 165 BlockDriverState *bs; 166 int flags; 167 QDict *options; 168 QDict *explicit_options; 169 void *opaque; 170 } BDRVReopenState; 171 172 /* 173 * Block operation types 174 */ 175 typedef enum BlockOpType { 176 BLOCK_OP_TYPE_BACKUP_SOURCE, 177 BLOCK_OP_TYPE_BACKUP_TARGET, 178 BLOCK_OP_TYPE_CHANGE, 179 BLOCK_OP_TYPE_COMMIT_SOURCE, 180 BLOCK_OP_TYPE_COMMIT_TARGET, 181 BLOCK_OP_TYPE_DATAPLANE, 182 BLOCK_OP_TYPE_DRIVE_DEL, 183 BLOCK_OP_TYPE_EJECT, 184 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, 185 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, 186 BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, 187 BLOCK_OP_TYPE_MIRROR_SOURCE, 188 BLOCK_OP_TYPE_MIRROR_TARGET, 189 BLOCK_OP_TYPE_RESIZE, 190 BLOCK_OP_TYPE_STREAM, 191 BLOCK_OP_TYPE_REPLACE, 192 BLOCK_OP_TYPE_MAX, 193 } BlockOpType; 194 195 /* Block node permission constants */ 196 enum { 197 /** 198 * A user that has the "permission" of consistent reads is guaranteed that 199 * their view of the contents of the block device is complete and 200 * self-consistent, representing the contents of a disk at a specific 201 * point. 202 * 203 * For most block devices (including their backing files) this is true, but 204 * the property cannot be maintained in a few situations like for 205 * intermediate nodes of a commit block job. 206 */ 207 BLK_PERM_CONSISTENT_READ = 0x01, 208 209 /** This permission is required to change the visible disk contents. */ 210 BLK_PERM_WRITE = 0x02, 211 212 /** 213 * This permission (which is weaker than BLK_PERM_WRITE) is both enough and 214 * required for writes to the block node when the caller promises that 215 * the visible disk content doesn't change. 216 */ 217 BLK_PERM_WRITE_UNCHANGED = 0x04, 218 219 /** This permission is required to change the size of a block node. */ 220 BLK_PERM_RESIZE = 0x08, 221 222 /** 223 * This permission is required to change the node that this BdrvChild 224 * points to. 225 */ 226 BLK_PERM_GRAPH_MOD = 0x10, 227 228 BLK_PERM_ALL = 0x1f, 229 }; 230 231 char *bdrv_perm_names(uint64_t perm); 232 233 /* disk I/O throttling */ 234 void bdrv_init(void); 235 void bdrv_init_with_whitelist(void); 236 bool bdrv_uses_whitelist(void); 237 BlockDriver *bdrv_find_protocol(const char *filename, 238 bool allow_protocol_prefix, 239 Error **errp); 240 BlockDriver *bdrv_find_format(const char *format_name); 241 int bdrv_create(BlockDriver *drv, const char* filename, 242 QemuOpts *opts, Error **errp); 243 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); 244 BlockDriverState *bdrv_new(void); 245 void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, 246 Error **errp); 247 void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, 248 Error **errp); 249 250 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough); 251 int bdrv_parse_discard_flags(const char *mode, int *flags); 252 BdrvChild *bdrv_open_child(const char *filename, 253 QDict *options, const char *bdref_key, 254 BlockDriverState* parent, 255 const BdrvChildRole *child_role, 256 bool allow_none, Error **errp); 257 void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, 258 Error **errp); 259 int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, 260 const char *bdref_key, Error **errp); 261 BlockDriverState *bdrv_open(const char *filename, const char *reference, 262 QDict *options, int flags, Error **errp); 263 BlockDriverState *bdrv_new_open_driver(BlockDriver *drv, const char *node_name, 264 int flags, Error **errp); 265 BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, 266 BlockDriverState *bs, 267 QDict *options, int flags); 268 int bdrv_reopen_multiple(AioContext *ctx, BlockReopenQueue *bs_queue, Error **errp); 269 int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp); 270 int bdrv_reopen_prepare(BDRVReopenState *reopen_state, 271 BlockReopenQueue *queue, Error **errp); 272 void bdrv_reopen_commit(BDRVReopenState *reopen_state); 273 void bdrv_reopen_abort(BDRVReopenState *reopen_state); 274 int bdrv_read(BdrvChild *child, int64_t sector_num, 275 uint8_t *buf, int nb_sectors); 276 int bdrv_write(BdrvChild *child, int64_t sector_num, 277 const uint8_t *buf, int nb_sectors); 278 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset, 279 int bytes, BdrvRequestFlags flags); 280 int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags); 281 int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes); 282 int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 283 int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes); 284 int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov); 285 int bdrv_pwrite_sync(BdrvChild *child, int64_t offset, 286 const void *buf, int count); 287 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num, 288 int nb_sectors, QEMUIOVector *qiov); 289 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num, 290 int nb_sectors, QEMUIOVector *qiov); 291 /* 292 * Efficiently zero a region of the disk image. Note that this is a regular 293 * I/O request like read or write and should have a reasonable size. This 294 * function is not suitable for zeroing the entire image in a single request 295 * because it may allocate memory for the entire region. 296 */ 297 int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset, 298 int bytes, BdrvRequestFlags flags); 299 BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, 300 const char *backing_file); 301 int bdrv_get_backing_file_depth(BlockDriverState *bs); 302 void bdrv_refresh_filename(BlockDriverState *bs); 303 int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp); 304 int64_t bdrv_nb_sectors(BlockDriverState *bs); 305 int64_t bdrv_getlength(BlockDriverState *bs); 306 int64_t bdrv_get_allocated_file_size(BlockDriverState *bs); 307 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr); 308 void bdrv_refresh_limits(BlockDriverState *bs, Error **errp); 309 int bdrv_commit(BlockDriverState *bs); 310 int bdrv_change_backing_file(BlockDriverState *bs, 311 const char *backing_file, const char *backing_fmt); 312 void bdrv_register(BlockDriver *bdrv); 313 int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, 314 BlockDriverState *base, 315 const char *backing_file_str); 316 BlockDriverState *bdrv_find_overlay(BlockDriverState *active, 317 BlockDriverState *bs); 318 BlockDriverState *bdrv_find_base(BlockDriverState *bs); 319 320 321 typedef struct BdrvCheckResult { 322 int corruptions; 323 int leaks; 324 int check_errors; 325 int corruptions_fixed; 326 int leaks_fixed; 327 int64_t image_end_offset; 328 BlockFragInfo bfi; 329 } BdrvCheckResult; 330 331 typedef enum { 332 BDRV_FIX_LEAKS = 1, 333 BDRV_FIX_ERRORS = 2, 334 } BdrvCheckMode; 335 336 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix); 337 338 /* The units of offset and total_work_size may be chosen arbitrarily by the 339 * block driver; total_work_size may change during the course of the amendment 340 * operation */ 341 typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset, 342 int64_t total_work_size, void *opaque); 343 int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts, 344 BlockDriverAmendStatusCB *status_cb, void *cb_opaque); 345 346 /* external snapshots */ 347 bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, 348 BlockDriverState *candidate); 349 bool bdrv_is_first_non_filter(BlockDriverState *candidate); 350 351 /* check if a named node can be replaced when doing drive-mirror */ 352 BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs, 353 const char *node_name, Error **errp); 354 355 /* async block I/O */ 356 void bdrv_aio_cancel(BlockAIOCB *acb); 357 void bdrv_aio_cancel_async(BlockAIOCB *acb); 358 359 /* sg packet commands */ 360 int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf); 361 362 /* Invalidate any cached metadata used by image formats */ 363 void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp); 364 void bdrv_invalidate_cache_all(Error **errp); 365 int bdrv_inactivate_all(void); 366 367 /* Ensure contents are flushed to disk. */ 368 int bdrv_flush(BlockDriverState *bs); 369 int coroutine_fn bdrv_co_flush(BlockDriverState *bs); 370 int bdrv_flush_all(void); 371 void bdrv_close_all(void); 372 void bdrv_drain(BlockDriverState *bs); 373 void coroutine_fn bdrv_co_drain(BlockDriverState *bs); 374 void bdrv_drain_all_begin(void); 375 void bdrv_drain_all_end(void); 376 void bdrv_drain_all(void); 377 378 #define BDRV_POLL_WHILE(bs, cond) ({ \ 379 bool waited_ = false; \ 380 bool busy_ = true; \ 381 BlockDriverState *bs_ = (bs); \ 382 AioContext *ctx_ = bdrv_get_aio_context(bs_); \ 383 if (aio_context_in_iothread(ctx_)) { \ 384 while ((cond) || busy_) { \ 385 busy_ = aio_poll(ctx_, (cond)); \ 386 waited_ |= !!(cond) | busy_; \ 387 } \ 388 } else { \ 389 assert(qemu_get_current_aio_context() == \ 390 qemu_get_aio_context()); \ 391 /* Ask bdrv_dec_in_flight to wake up the main \ 392 * QEMU AioContext. Extra I/O threads never take \ 393 * other I/O threads' AioContexts (see for example \ 394 * block_job_defer_to_main_loop for how to do it). \ 395 */ \ 396 assert(!bs_->wakeup); \ 397 /* Set bs->wakeup before evaluating cond. */ \ 398 atomic_mb_set(&bs_->wakeup, true); \ 399 while (busy_) { \ 400 if ((cond)) { \ 401 waited_ = busy_ = true; \ 402 aio_context_release(ctx_); \ 403 aio_poll(qemu_get_aio_context(), true); \ 404 aio_context_acquire(ctx_); \ 405 } else { \ 406 busy_ = aio_poll(ctx_, false); \ 407 waited_ |= busy_; \ 408 } \ 409 } \ 410 atomic_set(&bs_->wakeup, false); \ 411 } \ 412 waited_; }) 413 414 int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 415 int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes); 416 int bdrv_has_zero_init_1(BlockDriverState *bs); 417 int bdrv_has_zero_init(BlockDriverState *bs); 418 bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs); 419 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs); 420 int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, 421 int nb_sectors, int *pnum, 422 BlockDriverState **file); 423 int64_t bdrv_get_block_status_above(BlockDriverState *bs, 424 BlockDriverState *base, 425 int64_t sector_num, 426 int nb_sectors, int *pnum, 427 BlockDriverState **file); 428 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 429 int *pnum); 430 int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base, 431 int64_t sector_num, int nb_sectors, int *pnum); 432 433 bool bdrv_is_read_only(BlockDriverState *bs); 434 bool bdrv_is_writable(BlockDriverState *bs); 435 int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); 436 int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp); 437 bool bdrv_is_sg(BlockDriverState *bs); 438 bool bdrv_is_inserted(BlockDriverState *bs); 439 int bdrv_media_changed(BlockDriverState *bs); 440 void bdrv_lock_medium(BlockDriverState *bs, bool locked); 441 void bdrv_eject(BlockDriverState *bs, bool eject_flag); 442 const char *bdrv_get_format_name(BlockDriverState *bs); 443 BlockDriverState *bdrv_find_node(const char *node_name); 444 BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp); 445 BlockDriverState *bdrv_lookup_bs(const char *device, 446 const char *node_name, 447 Error **errp); 448 bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base); 449 BlockDriverState *bdrv_next_node(BlockDriverState *bs); 450 451 typedef struct BdrvNextIterator { 452 enum { 453 BDRV_NEXT_BACKEND_ROOTS, 454 BDRV_NEXT_MONITOR_OWNED, 455 } phase; 456 BlockBackend *blk; 457 BlockDriverState *bs; 458 } BdrvNextIterator; 459 460 BlockDriverState *bdrv_first(BdrvNextIterator *it); 461 BlockDriverState *bdrv_next(BdrvNextIterator *it); 462 463 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs); 464 bool bdrv_is_encrypted(BlockDriverState *bs); 465 bool bdrv_key_required(BlockDriverState *bs); 466 int bdrv_set_key(BlockDriverState *bs, const char *key); 467 void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp); 468 void bdrv_iterate_format(void (*it)(void *opaque, const char *name), 469 void *opaque); 470 const char *bdrv_get_node_name(const BlockDriverState *bs); 471 const char *bdrv_get_device_name(const BlockDriverState *bs); 472 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs); 473 int bdrv_get_flags(BlockDriverState *bs); 474 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi); 475 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs); 476 void bdrv_round_sectors_to_clusters(BlockDriverState *bs, 477 int64_t sector_num, int nb_sectors, 478 int64_t *cluster_sector_num, 479 int *cluster_nb_sectors); 480 void bdrv_round_to_clusters(BlockDriverState *bs, 481 int64_t offset, unsigned int bytes, 482 int64_t *cluster_offset, 483 unsigned int *cluster_bytes); 484 485 const char *bdrv_get_encrypted_filename(BlockDriverState *bs); 486 void bdrv_get_backing_filename(BlockDriverState *bs, 487 char *filename, int filename_size); 488 void bdrv_get_full_backing_filename(BlockDriverState *bs, 489 char *dest, size_t sz, Error **errp); 490 void bdrv_get_full_backing_filename_from_filename(const char *backed, 491 const char *backing, 492 char *dest, size_t sz, 493 Error **errp); 494 495 int path_has_protocol(const char *path); 496 int path_is_absolute(const char *path); 497 void path_combine(char *dest, int dest_size, 498 const char *base_path, 499 const char *filename); 500 501 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 502 int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos); 503 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, 504 int64_t pos, int size); 505 506 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, 507 int64_t pos, int size); 508 509 void bdrv_img_create(const char *filename, const char *fmt, 510 const char *base_filename, const char *base_fmt, 511 char *options, uint64_t img_size, int flags, 512 bool quiet, Error **errp); 513 514 /* Returns the alignment in bytes that is required so that no bounce buffer 515 * is required throughout the stack */ 516 size_t bdrv_min_mem_align(BlockDriverState *bs); 517 /* Returns optimal alignment in bytes for bounce buffer */ 518 size_t bdrv_opt_mem_align(BlockDriverState *bs); 519 void *qemu_blockalign(BlockDriverState *bs, size_t size); 520 void *qemu_blockalign0(BlockDriverState *bs, size_t size); 521 void *qemu_try_blockalign(BlockDriverState *bs, size_t size); 522 void *qemu_try_blockalign0(BlockDriverState *bs, size_t size); 523 bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov); 524 525 void bdrv_enable_copy_on_read(BlockDriverState *bs); 526 void bdrv_disable_copy_on_read(BlockDriverState *bs); 527 528 void bdrv_ref(BlockDriverState *bs); 529 void bdrv_unref(BlockDriverState *bs); 530 void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child); 531 BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs, 532 BlockDriverState *child_bs, 533 const char *child_name, 534 const BdrvChildRole *child_role, 535 Error **errp); 536 537 bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp); 538 void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason); 539 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason); 540 void bdrv_op_block_all(BlockDriverState *bs, Error *reason); 541 void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason); 542 bool bdrv_op_blocker_is_empty(BlockDriverState *bs); 543 544 #define BLKDBG_EVENT(child, evt) \ 545 do { \ 546 if (child) { \ 547 bdrv_debug_event(child->bs, evt); \ 548 } \ 549 } while (0) 550 551 void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event); 552 553 int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, 554 const char *tag); 555 int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag); 556 int bdrv_debug_resume(BlockDriverState *bs, const char *tag); 557 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag); 558 559 /** 560 * bdrv_get_aio_context: 561 * 562 * Returns: the currently bound #AioContext 563 */ 564 AioContext *bdrv_get_aio_context(BlockDriverState *bs); 565 566 /** 567 * Transfer control to @co in the aio context of @bs 568 */ 569 void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co); 570 571 /** 572 * bdrv_set_aio_context: 573 * 574 * Changes the #AioContext used for fd handlers, timers, and BHs by this 575 * BlockDriverState and all its children. 576 * 577 * This function must be called with iothread lock held. 578 */ 579 void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); 580 int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); 581 int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); 582 583 void bdrv_io_plug(BlockDriverState *bs); 584 void bdrv_io_unplug(BlockDriverState *bs); 585 586 /** 587 * bdrv_parent_drained_begin: 588 * 589 * Begin a quiesced section of all users of @bs. This is part of 590 * bdrv_drained_begin. 591 */ 592 void bdrv_parent_drained_begin(BlockDriverState *bs); 593 594 /** 595 * bdrv_parent_drained_end: 596 * 597 * End a quiesced section of all users of @bs. This is part of 598 * bdrv_drained_end. 599 */ 600 void bdrv_parent_drained_end(BlockDriverState *bs); 601 602 /** 603 * bdrv_drained_begin: 604 * 605 * Begin a quiesced section for exclusive access to the BDS, by disabling 606 * external request sources including NBD server and device model. Note that 607 * this doesn't block timers or coroutines from submitting more requests, which 608 * means block_job_pause is still necessary. 609 * 610 * This function can be recursive. 611 */ 612 void bdrv_drained_begin(BlockDriverState *bs); 613 614 /** 615 * bdrv_drained_end: 616 * 617 * End a quiescent section started by bdrv_drained_begin(). 618 */ 619 void bdrv_drained_end(BlockDriverState *bs); 620 621 void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, 622 Error **errp); 623 void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp); 624 625 #endif 626