1 /* 2 * QEMU System Emulator block driver 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #ifndef BLOCK_INT_H 25 #define BLOCK_INT_H 26 27 #include "block/accounting.h" 28 #include "block/block.h" 29 #include "block/throttle-groups.h" 30 #include "qemu/option.h" 31 #include "qemu/queue.h" 32 #include "qemu/coroutine.h" 33 #include "qemu/timer.h" 34 #include "qapi-types.h" 35 #include "qemu/hbitmap.h" 36 #include "block/snapshot.h" 37 #include "qemu/main-loop.h" 38 #include "qemu/throttle.h" 39 40 #define BLOCK_FLAG_ENCRYPT 1 41 #define BLOCK_FLAG_COMPAT6 4 42 #define BLOCK_FLAG_LAZY_REFCOUNTS 8 43 44 #define BLOCK_OPT_SIZE "size" 45 #define BLOCK_OPT_ENCRYPT "encryption" 46 #define BLOCK_OPT_COMPAT6 "compat6" 47 #define BLOCK_OPT_BACKING_FILE "backing_file" 48 #define BLOCK_OPT_BACKING_FMT "backing_fmt" 49 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" 50 #define BLOCK_OPT_TABLE_SIZE "table_size" 51 #define BLOCK_OPT_PREALLOC "preallocation" 52 #define BLOCK_OPT_SUBFMT "subformat" 53 #define BLOCK_OPT_COMPAT_LEVEL "compat" 54 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts" 55 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type" 56 #define BLOCK_OPT_REDUNDANCY "redundancy" 57 #define BLOCK_OPT_NOCOW "nocow" 58 #define BLOCK_OPT_OBJECT_SIZE "object_size" 59 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits" 60 61 #define BLOCK_PROBE_BUF_SIZE 512 62 63 enum BdrvTrackedRequestType { 64 BDRV_TRACKED_READ, 65 BDRV_TRACKED_WRITE, 66 BDRV_TRACKED_FLUSH, 67 BDRV_TRACKED_IOCTL, 68 BDRV_TRACKED_DISCARD, 69 }; 70 71 typedef struct BdrvTrackedRequest { 72 BlockDriverState *bs; 73 int64_t offset; 74 unsigned int bytes; 75 enum BdrvTrackedRequestType type; 76 77 bool serialising; 78 int64_t overlap_offset; 79 unsigned int overlap_bytes; 80 81 QLIST_ENTRY(BdrvTrackedRequest) list; 82 Coroutine *co; /* owner, used for deadlock detection */ 83 CoQueue wait_queue; /* coroutines blocked on this request */ 84 85 struct BdrvTrackedRequest *waiting_for; 86 } BdrvTrackedRequest; 87 88 struct BlockDriver { 89 const char *format_name; 90 int instance_size; 91 92 /* set to true if the BlockDriver is a block filter */ 93 bool is_filter; 94 /* for snapshots block filter like Quorum can implement the 95 * following recursive callback. 96 * It's purpose is to recurse on the filter children while calling 97 * bdrv_recurse_is_first_non_filter on them. 98 * For a sample implementation look in the future Quorum block filter. 99 */ 100 bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, 101 BlockDriverState *candidate); 102 103 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); 104 int (*bdrv_probe_device)(const char *filename); 105 106 /* Any driver implementing this callback is expected to be able to handle 107 * NULL file names in its .bdrv_open() implementation */ 108 void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); 109 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have 110 * this field set to true, except ones that are defined only by their 111 * child's bs. 112 * An example of the last type will be the quorum block driver. 113 */ 114 bool bdrv_needs_filename; 115 116 /* Set if a driver can support backing files */ 117 bool supports_backing; 118 119 /* For handling image reopen for split or non-split files */ 120 int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, 121 BlockReopenQueue *queue, Error **errp); 122 void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); 123 void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); 124 void (*bdrv_join_options)(QDict *options, QDict *old_options); 125 126 int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, 127 Error **errp); 128 int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, 129 Error **errp); 130 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, 131 uint8_t *buf, int nb_sectors); 132 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, 133 const uint8_t *buf, int nb_sectors); 134 void (*bdrv_close)(BlockDriverState *bs); 135 int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp); 136 int (*bdrv_set_key)(BlockDriverState *bs, const char *key); 137 int (*bdrv_make_empty)(BlockDriverState *bs); 138 139 void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options); 140 141 /* aio */ 142 BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, 143 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 144 BlockCompletionFunc *cb, void *opaque); 145 BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, 146 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 147 BlockCompletionFunc *cb, void *opaque); 148 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, 149 BlockCompletionFunc *cb, void *opaque); 150 BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs, 151 int64_t sector_num, int nb_sectors, 152 BlockCompletionFunc *cb, void *opaque); 153 154 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, 155 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 156 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, 157 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 158 /* 159 * Efficiently zero a region of the disk image. Typically an image format 160 * would use a compact metadata representation to implement this. This 161 * function pointer may be NULL and .bdrv_co_writev() will be called 162 * instead. 163 */ 164 int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs, 165 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); 166 int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, 167 int64_t sector_num, int nb_sectors); 168 int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs, 169 int64_t sector_num, int nb_sectors, int *pnum); 170 171 /* 172 * Invalidate any cached meta-data. 173 */ 174 void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp); 175 176 /* 177 * Flushes all data that was already written to the OS all the way down to 178 * the disk (for example raw-posix calls fsync()). 179 */ 180 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); 181 182 /* 183 * Flushes all internal caches to the OS. The data may still sit in a 184 * writeback cache of the host OS, but it will survive a crash of the qemu 185 * process. 186 */ 187 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); 188 189 const char *protocol_name; 190 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); 191 192 int64_t (*bdrv_getlength)(BlockDriverState *bs); 193 bool has_variable_length; 194 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); 195 196 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, 197 const uint8_t *buf, int nb_sectors); 198 199 int (*bdrv_snapshot_create)(BlockDriverState *bs, 200 QEMUSnapshotInfo *sn_info); 201 int (*bdrv_snapshot_goto)(BlockDriverState *bs, 202 const char *snapshot_id); 203 int (*bdrv_snapshot_delete)(BlockDriverState *bs, 204 const char *snapshot_id, 205 const char *name, 206 Error **errp); 207 int (*bdrv_snapshot_list)(BlockDriverState *bs, 208 QEMUSnapshotInfo **psn_info); 209 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, 210 const char *snapshot_id, 211 const char *name, 212 Error **errp); 213 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); 214 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs); 215 216 int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov, 217 int64_t pos); 218 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf, 219 int64_t pos, int size); 220 221 int (*bdrv_change_backing_file)(BlockDriverState *bs, 222 const char *backing_file, const char *backing_fmt); 223 224 /* removable device specific */ 225 bool (*bdrv_is_inserted)(BlockDriverState *bs); 226 int (*bdrv_media_changed)(BlockDriverState *bs); 227 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 228 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 229 230 /* to control generic scsi devices */ 231 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 232 unsigned long int req, void *buf, 233 BlockCompletionFunc *cb, void *opaque); 234 235 /* List of options for creating images, terminated by name == NULL */ 236 QemuOptsList *create_opts; 237 238 /* 239 * Returns 0 for completed check, -errno for internal errors. 240 * The check results are stored in result. 241 */ 242 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, 243 BdrvCheckMode fix); 244 245 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 246 BlockDriverAmendStatusCB *status_cb, 247 void *cb_opaque); 248 249 void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event); 250 251 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 252 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 253 const char *tag); 254 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 255 const char *tag); 256 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 257 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 258 259 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 260 261 /* 262 * Returns 1 if newly created images are guaranteed to contain only 263 * zeros, 0 otherwise. 264 */ 265 int (*bdrv_has_zero_init)(BlockDriverState *bs); 266 267 /* Remove fd handlers, timers, and other event loop callbacks so the event 268 * loop is no longer in use. Called with no in-flight requests and in 269 * depth-first traversal order with parents before child nodes. 270 */ 271 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 272 273 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 274 * can be processed again. Called with no in-flight requests and in 275 * depth-first traversal order with child nodes before parent nodes. 276 */ 277 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 278 AioContext *new_context); 279 280 /* io queue for linux-aio */ 281 void (*bdrv_io_plug)(BlockDriverState *bs); 282 void (*bdrv_io_unplug)(BlockDriverState *bs); 283 void (*bdrv_flush_io_queue)(BlockDriverState *bs); 284 285 /** 286 * Try to get @bs's logical and physical block size. 287 * On success, store them in @bsz and return zero. 288 * On failure, return negative errno. 289 */ 290 int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); 291 /** 292 * Try to get @bs's geometry (cyls, heads, sectors) 293 * On success, store them in @geo and return 0. 294 * On failure return -errno. 295 * Only drivers that want to override guest geometry implement this 296 * callback; see hd_geometry_guess(). 297 */ 298 int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); 299 300 /** 301 * Drain and stop any internal sources of requests in the driver, and 302 * remain so until next I/O callback (e.g. bdrv_co_writev) is called. 303 */ 304 void (*bdrv_drain)(BlockDriverState *bs); 305 306 QLIST_ENTRY(BlockDriver) list; 307 }; 308 309 typedef struct BlockLimits { 310 /* maximum number of sectors that can be discarded at once */ 311 int max_discard; 312 313 /* optimal alignment for discard requests in sectors */ 314 int64_t discard_alignment; 315 316 /* maximum number of sectors that can zeroized at once */ 317 int max_write_zeroes; 318 319 /* optimal alignment for write zeroes requests in sectors */ 320 int64_t write_zeroes_alignment; 321 322 /* optimal transfer length in sectors */ 323 int opt_transfer_length; 324 325 /* maximal transfer length in sectors */ 326 int max_transfer_length; 327 328 /* memory alignment so that no bounce buffer is needed */ 329 size_t min_mem_alignment; 330 331 /* memory alignment for bounce buffer */ 332 size_t opt_mem_alignment; 333 334 /* maximum number of iovec elements */ 335 int max_iov; 336 } BlockLimits; 337 338 typedef struct BdrvOpBlocker BdrvOpBlocker; 339 340 typedef struct BdrvAioNotifier { 341 void (*attached_aio_context)(AioContext *new_context, void *opaque); 342 void (*detach_aio_context)(void *opaque); 343 344 void *opaque; 345 346 QLIST_ENTRY(BdrvAioNotifier) list; 347 } BdrvAioNotifier; 348 349 struct BdrvChildRole { 350 void (*inherit_options)(int *child_flags, QDict *child_options, 351 int parent_flags, QDict *parent_options); 352 }; 353 354 extern const BdrvChildRole child_file; 355 extern const BdrvChildRole child_format; 356 357 struct BdrvChild { 358 BlockDriverState *bs; 359 char *name; 360 const BdrvChildRole *role; 361 QLIST_ENTRY(BdrvChild) next; 362 QLIST_ENTRY(BdrvChild) next_parent; 363 }; 364 365 /* 366 * Note: the function bdrv_append() copies and swaps contents of 367 * BlockDriverStates, so if you add new fields to this struct, please 368 * inspect bdrv_append() to determine if the new fields need to be 369 * copied as well. 370 */ 371 struct BlockDriverState { 372 int64_t total_sectors; /* if we are reading a disk image, give its 373 size in sectors */ 374 int read_only; /* if true, the media is read only */ 375 int open_flags; /* flags used to open the file, re-used for re-open */ 376 int encrypted; /* if true, the media is encrypted */ 377 int valid_key; /* if true, a valid encryption key has been set */ 378 int sg; /* if true, the device is a /dev/sg* */ 379 int copy_on_read; /* if true, copy read backing sectors into image 380 note this is a reference count */ 381 bool probed; 382 383 BlockDriver *drv; /* NULL means no media */ 384 void *opaque; 385 386 BlockBackend *blk; /* owning backend, if any */ 387 388 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 389 /* long-running tasks intended to always use the same AioContext as this 390 * BDS may register themselves in this list to be notified of changes 391 * regarding this BDS's context */ 392 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 393 394 char filename[PATH_MAX]; 395 char backing_file[PATH_MAX]; /* if non zero, the image is a diff of 396 this file image */ 397 char backing_format[16]; /* if non-zero and backing_file exists */ 398 399 QDict *full_open_options; 400 char exact_filename[PATH_MAX]; 401 402 BdrvChild *backing; 403 BdrvChild *file; 404 405 NotifierList close_notifiers; 406 407 /* Callback before write request is processed */ 408 NotifierWithReturnList before_write_notifiers; 409 410 /* number of in-flight serialising requests */ 411 unsigned int serialising_in_flight; 412 413 /* I/O throttling. 414 * throttle_state tells us if this BDS has I/O limits configured. 415 * io_limits_enabled tells us if they are currently being 416 * enforced, but it can be temporarily set to false */ 417 CoQueue throttled_reqs[2]; 418 bool io_limits_enabled; 419 /* The following fields are protected by the ThrottleGroup lock. 420 * See the ThrottleGroup documentation for details. */ 421 ThrottleState *throttle_state; 422 ThrottleTimers throttle_timers; 423 unsigned pending_reqs[2]; 424 QLIST_ENTRY(BlockDriverState) round_robin; 425 426 /* Offset after the highest byte written to */ 427 uint64_t wr_highest_offset; 428 429 /* I/O Limits */ 430 BlockLimits bl; 431 432 /* Whether produces zeros when read beyond eof */ 433 bool zero_beyond_eof; 434 435 /* Alignment requirement for offset/length of I/O requests */ 436 unsigned int request_alignment; 437 438 /* do we need to tell the quest if we have a volatile write cache? */ 439 int enable_write_cache; 440 441 /* the following member gives a name to every node on the bs graph. */ 442 char node_name[32]; 443 /* element of the list of named nodes building the graph */ 444 QTAILQ_ENTRY(BlockDriverState) node_list; 445 /* element of the list of "drives" the guest sees */ 446 QTAILQ_ENTRY(BlockDriverState) device_list; 447 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 448 int refcnt; 449 450 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 451 452 /* operation blockers */ 453 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 454 455 /* long-running background operation */ 456 BlockJob *job; 457 458 /* The node that this node inherited default options from (and a reopen on 459 * which can affect this node by changing these defaults). This is always a 460 * parent node of this node. */ 461 BlockDriverState *inherits_from; 462 QLIST_HEAD(, BdrvChild) children; 463 QLIST_HEAD(, BdrvChild) parents; 464 465 QDict *options; 466 QDict *explicit_options; 467 BlockdevDetectZeroesOptions detect_zeroes; 468 469 /* The error object in use for blocking operations on backing_hd */ 470 Error *backing_blocker; 471 472 /* threshold limit for writes, in bytes. "High water mark". */ 473 uint64_t write_threshold_offset; 474 NotifierWithReturn write_threshold_notifier; 475 476 int quiesce_counter; 477 }; 478 479 struct BlockBackendRootState { 480 int open_flags; 481 bool read_only; 482 BlockdevDetectZeroesOptions detect_zeroes; 483 484 char *throttle_group; 485 ThrottleState *throttle_state; 486 }; 487 488 static inline BlockDriverState *backing_bs(BlockDriverState *bs) 489 { 490 return bs->backing ? bs->backing->bs : NULL; 491 } 492 493 494 /* Essential block drivers which must always be statically linked into qemu, and 495 * which therefore can be accessed without using bdrv_find_format() */ 496 extern BlockDriver bdrv_file; 497 extern BlockDriver bdrv_raw; 498 extern BlockDriver bdrv_qcow2; 499 500 extern QTAILQ_HEAD(BdrvStates, BlockDriverState) bdrv_states; 501 502 /** 503 * bdrv_setup_io_funcs: 504 * 505 * Prepare a #BlockDriver for I/O request processing by populating 506 * unimplemented coroutine and AIO interfaces with generic wrapper functions 507 * that fall back to implemented interfaces. 508 */ 509 void bdrv_setup_io_funcs(BlockDriver *bdrv); 510 511 int get_tmp_filename(char *filename, int size); 512 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, 513 const char *filename); 514 515 void bdrv_set_io_limits(BlockDriverState *bs, 516 ThrottleConfig *cfg); 517 518 519 /** 520 * bdrv_add_before_write_notifier: 521 * 522 * Register a callback that is invoked before write requests are processed but 523 * after any throttling or waiting for overlapping requests. 524 */ 525 void bdrv_add_before_write_notifier(BlockDriverState *bs, 526 NotifierWithReturn *notifier); 527 528 /** 529 * bdrv_detach_aio_context: 530 * 531 * May be called from .bdrv_detach_aio_context() to detach children from the 532 * current #AioContext. This is only needed by block drivers that manage their 533 * own children. Both ->file and ->backing are automatically handled and 534 * block drivers should not call this function on them explicitly. 535 */ 536 void bdrv_detach_aio_context(BlockDriverState *bs); 537 538 /** 539 * bdrv_attach_aio_context: 540 * 541 * May be called from .bdrv_attach_aio_context() to attach children to the new 542 * #AioContext. This is only needed by block drivers that manage their own 543 * children. Both ->file and ->backing are automatically handled and block 544 * drivers should not call this function on them explicitly. 545 */ 546 void bdrv_attach_aio_context(BlockDriverState *bs, 547 AioContext *new_context); 548 549 /** 550 * bdrv_add_aio_context_notifier: 551 * 552 * If a long-running job intends to be always run in the same AioContext as a 553 * certain BDS, it may use this function to be notified of changes regarding the 554 * association of the BDS to an AioContext. 555 * 556 * attached_aio_context() is called after the target BDS has been attached to a 557 * new AioContext; detach_aio_context() is called before the target BDS is being 558 * detached from its old AioContext. 559 */ 560 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 561 void (*attached_aio_context)(AioContext *new_context, void *opaque), 562 void (*detach_aio_context)(void *opaque), void *opaque); 563 564 /** 565 * bdrv_remove_aio_context_notifier: 566 * 567 * Unsubscribe of change notifications regarding the BDS's AioContext. The 568 * parameters given here have to be the same as those given to 569 * bdrv_add_aio_context_notifier(). 570 */ 571 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 572 void (*aio_context_attached)(AioContext *, 573 void *), 574 void (*aio_context_detached)(void *), 575 void *opaque); 576 577 #ifdef _WIN32 578 int is_windows_drive(const char *filename); 579 #endif 580 581 /** 582 * stream_start: 583 * @bs: Block device to operate on. 584 * @base: Block device that will become the new base, or %NULL to 585 * flatten the whole backing file chain onto @bs. 586 * @base_id: The file name that will be written to @bs as the new 587 * backing file if the job completes. Ignored if @base is %NULL. 588 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 589 * @on_error: The action to take upon error. 590 * @cb: Completion function for the job. 591 * @opaque: Opaque pointer value passed to @cb. 592 * @errp: Error object. 593 * 594 * Start a streaming operation on @bs. Clusters that are unallocated 595 * in @bs, but allocated in any image between @base and @bs (both 596 * exclusive) will be written to @bs. At the end of a successful 597 * streaming job, the backing file of @bs will be changed to 598 * @base_id in the written image and to @base in the live BlockDriverState. 599 */ 600 void stream_start(BlockDriverState *bs, BlockDriverState *base, 601 const char *base_id, int64_t speed, BlockdevOnError on_error, 602 BlockCompletionFunc *cb, 603 void *opaque, Error **errp); 604 605 /** 606 * commit_start: 607 * @bs: Active block device. 608 * @top: Top block device to be committed. 609 * @base: Block device that will be written into, and become the new top. 610 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 611 * @on_error: The action to take upon error. 612 * @cb: Completion function for the job. 613 * @opaque: Opaque pointer value passed to @cb. 614 * @backing_file_str: String to use as the backing file in @top's overlay 615 * @errp: Error object. 616 * 617 */ 618 void commit_start(BlockDriverState *bs, BlockDriverState *base, 619 BlockDriverState *top, int64_t speed, 620 BlockdevOnError on_error, BlockCompletionFunc *cb, 621 void *opaque, const char *backing_file_str, Error **errp); 622 /** 623 * commit_active_start: 624 * @bs: Active block device to be committed. 625 * @base: Block device that will be written into, and become the new top. 626 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 627 * @on_error: The action to take upon error. 628 * @cb: Completion function for the job. 629 * @opaque: Opaque pointer value passed to @cb. 630 * @errp: Error object. 631 * 632 */ 633 void commit_active_start(BlockDriverState *bs, BlockDriverState *base, 634 int64_t speed, 635 BlockdevOnError on_error, 636 BlockCompletionFunc *cb, 637 void *opaque, Error **errp); 638 /* 639 * mirror_start: 640 * @bs: Block device to operate on. 641 * @target: Block device to write to. 642 * @replaces: Block graph node name to replace once the mirror is done. Can 643 * only be used when full mirroring is selected. 644 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 645 * @granularity: The chosen granularity for the dirty bitmap. 646 * @buf_size: The amount of data that can be in flight at one time. 647 * @mode: Whether to collapse all images in the chain to the target. 648 * @on_source_error: The action to take upon error reading from the source. 649 * @on_target_error: The action to take upon error writing to the target. 650 * @unmap: Whether to unmap target where source sectors only contain zeroes. 651 * @cb: Completion function for the job. 652 * @opaque: Opaque pointer value passed to @cb. 653 * @errp: Error object. 654 * 655 * Start a mirroring operation on @bs. Clusters that are allocated 656 * in @bs will be written to @bs until the job is cancelled or 657 * manually completed. At the end of a successful mirroring job, 658 * @bs will be switched to read from @target. 659 */ 660 void mirror_start(BlockDriverState *bs, BlockDriverState *target, 661 const char *replaces, 662 int64_t speed, uint32_t granularity, int64_t buf_size, 663 MirrorSyncMode mode, BlockdevOnError on_source_error, 664 BlockdevOnError on_target_error, 665 bool unmap, 666 BlockCompletionFunc *cb, 667 void *opaque, Error **errp); 668 669 /* 670 * backup_start: 671 * @bs: Block device to operate on. 672 * @target: Block device to write to. 673 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 674 * @sync_mode: What parts of the disk image should be copied to the destination. 675 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL. 676 * @on_source_error: The action to take upon error reading from the source. 677 * @on_target_error: The action to take upon error writing to the target. 678 * @cb: Completion function for the job. 679 * @opaque: Opaque pointer value passed to @cb. 680 * @txn: Transaction that this job is part of (may be NULL). 681 * 682 * Start a backup operation on @bs. Clusters in @bs are written to @target 683 * until the job is cancelled or manually completed. 684 */ 685 void backup_start(BlockDriverState *bs, BlockDriverState *target, 686 int64_t speed, MirrorSyncMode sync_mode, 687 BdrvDirtyBitmap *sync_bitmap, 688 BlockdevOnError on_source_error, 689 BlockdevOnError on_target_error, 690 BlockCompletionFunc *cb, void *opaque, 691 BlockJobTxn *txn, Error **errp); 692 693 void blk_set_bs(BlockBackend *blk, BlockDriverState *bs); 694 695 void blk_dev_change_media_cb(BlockBackend *blk, bool load); 696 bool blk_dev_has_removable_media(BlockBackend *blk); 697 void blk_dev_eject_request(BlockBackend *blk, bool force); 698 bool blk_dev_is_tray_open(BlockBackend *blk); 699 bool blk_dev_is_medium_locked(BlockBackend *blk); 700 void blk_dev_resize_cb(BlockBackend *blk); 701 702 void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors); 703 bool bdrv_requests_pending(BlockDriverState *bs); 704 705 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); 706 void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in); 707 708 #endif /* BLOCK_INT_H */ 709