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 "qemu/option.h" 30 #include "qemu/queue.h" 31 #include "block/coroutine.h" 32 #include "qemu/timer.h" 33 #include "qapi-types.h" 34 #include "qapi/qmp/qerror.h" 35 #include "monitor/monitor.h" 36 #include "qemu/hbitmap.h" 37 #include "block/snapshot.h" 38 #include "qemu/main-loop.h" 39 #include "qemu/throttle.h" 40 41 #define BLOCK_FLAG_ENCRYPT 1 42 #define BLOCK_FLAG_COMPAT6 4 43 #define BLOCK_FLAG_LAZY_REFCOUNTS 8 44 45 #define BLOCK_OPT_SIZE "size" 46 #define BLOCK_OPT_ENCRYPT "encryption" 47 #define BLOCK_OPT_COMPAT6 "compat6" 48 #define BLOCK_OPT_BACKING_FILE "backing_file" 49 #define BLOCK_OPT_BACKING_FMT "backing_fmt" 50 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" 51 #define BLOCK_OPT_TABLE_SIZE "table_size" 52 #define BLOCK_OPT_PREALLOC "preallocation" 53 #define BLOCK_OPT_SUBFMT "subformat" 54 #define BLOCK_OPT_COMPAT_LEVEL "compat" 55 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts" 56 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type" 57 #define BLOCK_OPT_REDUNDANCY "redundancy" 58 #define BLOCK_OPT_NOCOW "nocow" 59 60 typedef struct BdrvTrackedRequest { 61 BlockDriverState *bs; 62 int64_t offset; 63 unsigned int bytes; 64 bool is_write; 65 66 bool serialising; 67 int64_t overlap_offset; 68 unsigned int overlap_bytes; 69 70 QLIST_ENTRY(BdrvTrackedRequest) list; 71 Coroutine *co; /* owner, used for deadlock detection */ 72 CoQueue wait_queue; /* coroutines blocked on this request */ 73 74 struct BdrvTrackedRequest *waiting_for; 75 } BdrvTrackedRequest; 76 77 struct BlockDriver { 78 const char *format_name; 79 int instance_size; 80 81 /* set to true if the BlockDriver is a block filter */ 82 bool is_filter; 83 /* for snapshots block filter like Quorum can implement the 84 * following recursive callback. 85 * It's purpose is to recurse on the filter children while calling 86 * bdrv_recurse_is_first_non_filter on them. 87 * For a sample implementation look in the future Quorum block filter. 88 */ 89 bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, 90 BlockDriverState *candidate); 91 92 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); 93 int (*bdrv_probe_device)(const char *filename); 94 95 /* Any driver implementing this callback is expected to be able to handle 96 * NULL file names in its .bdrv_open() implementation */ 97 void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); 98 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have 99 * this field set to true, except ones that are defined only by their 100 * child's bs. 101 * An example of the last type will be the quorum block driver. 102 */ 103 bool bdrv_needs_filename; 104 105 /* Set if a driver can support backing files */ 106 bool supports_backing; 107 108 /* For handling image reopen for split or non-split files */ 109 int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, 110 BlockReopenQueue *queue, Error **errp); 111 void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); 112 void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); 113 114 int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, 115 Error **errp); 116 int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, 117 Error **errp); 118 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, 119 uint8_t *buf, int nb_sectors); 120 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, 121 const uint8_t *buf, int nb_sectors); 122 void (*bdrv_close)(BlockDriverState *bs); 123 void (*bdrv_rebind)(BlockDriverState *bs); 124 int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp); 125 int (*bdrv_set_key)(BlockDriverState *bs, const char *key); 126 int (*bdrv_make_empty)(BlockDriverState *bs); 127 128 void (*bdrv_refresh_filename)(BlockDriverState *bs); 129 130 /* aio */ 131 BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, 132 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 133 BlockCompletionFunc *cb, void *opaque); 134 BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, 135 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 136 BlockCompletionFunc *cb, void *opaque); 137 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, 138 BlockCompletionFunc *cb, void *opaque); 139 BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs, 140 int64_t sector_num, int nb_sectors, 141 BlockCompletionFunc *cb, void *opaque); 142 143 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, 144 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 145 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, 146 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 147 /* 148 * Efficiently zero a region of the disk image. Typically an image format 149 * would use a compact metadata representation to implement this. This 150 * function pointer may be NULL and .bdrv_co_writev() will be called 151 * instead. 152 */ 153 int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs, 154 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); 155 int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, 156 int64_t sector_num, int nb_sectors); 157 int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs, 158 int64_t sector_num, int nb_sectors, int *pnum); 159 160 /* 161 * Invalidate any cached meta-data. 162 */ 163 void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp); 164 165 /* 166 * Flushes all data that was already written to the OS all the way down to 167 * the disk (for example raw-posix calls fsync()). 168 */ 169 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); 170 171 /* 172 * Flushes all internal caches to the OS. The data may still sit in a 173 * writeback cache of the host OS, but it will survive a crash of the qemu 174 * process. 175 */ 176 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); 177 178 const char *protocol_name; 179 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); 180 181 int64_t (*bdrv_getlength)(BlockDriverState *bs); 182 bool has_variable_length; 183 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); 184 185 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, 186 const uint8_t *buf, int nb_sectors); 187 188 int (*bdrv_snapshot_create)(BlockDriverState *bs, 189 QEMUSnapshotInfo *sn_info); 190 int (*bdrv_snapshot_goto)(BlockDriverState *bs, 191 const char *snapshot_id); 192 int (*bdrv_snapshot_delete)(BlockDriverState *bs, 193 const char *snapshot_id, 194 const char *name, 195 Error **errp); 196 int (*bdrv_snapshot_list)(BlockDriverState *bs, 197 QEMUSnapshotInfo **psn_info); 198 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, 199 const char *snapshot_id, 200 const char *name, 201 Error **errp); 202 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); 203 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs); 204 205 int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov, 206 int64_t pos); 207 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf, 208 int64_t pos, int size); 209 210 int (*bdrv_change_backing_file)(BlockDriverState *bs, 211 const char *backing_file, const char *backing_fmt); 212 213 /* removable device specific */ 214 int (*bdrv_is_inserted)(BlockDriverState *bs); 215 int (*bdrv_media_changed)(BlockDriverState *bs); 216 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 217 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 218 219 /* to control generic scsi devices */ 220 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); 221 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 222 unsigned long int req, void *buf, 223 BlockCompletionFunc *cb, void *opaque); 224 225 /* List of options for creating images, terminated by name == NULL */ 226 QemuOptsList *create_opts; 227 228 /* 229 * Returns 0 for completed check, -errno for internal errors. 230 * The check results are stored in result. 231 */ 232 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, 233 BdrvCheckMode fix); 234 235 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 236 BlockDriverAmendStatusCB *status_cb); 237 238 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); 239 240 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 241 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 242 const char *tag); 243 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 244 const char *tag); 245 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 246 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 247 248 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 249 250 /* 251 * Returns 1 if newly created images are guaranteed to contain only 252 * zeros, 0 otherwise. 253 */ 254 int (*bdrv_has_zero_init)(BlockDriverState *bs); 255 256 /* Remove fd handlers, timers, and other event loop callbacks so the event 257 * loop is no longer in use. Called with no in-flight requests and in 258 * depth-first traversal order with parents before child nodes. 259 */ 260 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 261 262 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 263 * can be processed again. Called with no in-flight requests and in 264 * depth-first traversal order with child nodes before parent nodes. 265 */ 266 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 267 AioContext *new_context); 268 269 /* io queue for linux-aio */ 270 void (*bdrv_io_plug)(BlockDriverState *bs); 271 void (*bdrv_io_unplug)(BlockDriverState *bs); 272 void (*bdrv_flush_io_queue)(BlockDriverState *bs); 273 274 QLIST_ENTRY(BlockDriver) list; 275 }; 276 277 typedef struct BlockLimits { 278 /* maximum number of sectors that can be discarded at once */ 279 int max_discard; 280 281 /* optimal alignment for discard requests in sectors */ 282 int64_t discard_alignment; 283 284 /* maximum number of sectors that can zeroized at once */ 285 int max_write_zeroes; 286 287 /* optimal alignment for write zeroes requests in sectors */ 288 int64_t write_zeroes_alignment; 289 290 /* optimal transfer length in sectors */ 291 int opt_transfer_length; 292 293 /* maximal transfer length in sectors */ 294 int max_transfer_length; 295 296 /* memory alignment so that no bounce buffer is needed */ 297 size_t opt_mem_alignment; 298 } BlockLimits; 299 300 typedef struct BdrvOpBlocker BdrvOpBlocker; 301 302 typedef struct BdrvAioNotifier { 303 void (*attached_aio_context)(AioContext *new_context, void *opaque); 304 void (*detach_aio_context)(void *opaque); 305 306 void *opaque; 307 308 QLIST_ENTRY(BdrvAioNotifier) list; 309 } BdrvAioNotifier; 310 311 /* 312 * Note: the function bdrv_append() copies and swaps contents of 313 * BlockDriverStates, so if you add new fields to this struct, please 314 * inspect bdrv_append() to determine if the new fields need to be 315 * copied as well. 316 */ 317 struct BlockDriverState { 318 int64_t total_sectors; /* if we are reading a disk image, give its 319 size in sectors */ 320 int read_only; /* if true, the media is read only */ 321 int open_flags; /* flags used to open the file, re-used for re-open */ 322 int encrypted; /* if true, the media is encrypted */ 323 int valid_key; /* if true, a valid encryption key has been set */ 324 int sg; /* if true, the device is a /dev/sg* */ 325 int copy_on_read; /* if true, copy read backing sectors into image 326 note this is a reference count */ 327 328 BlockDriver *drv; /* NULL means no media */ 329 void *opaque; 330 331 BlockBackend *blk; /* owning backend, if any */ 332 333 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 334 /* long-running tasks intended to always use the same AioContext as this 335 * BDS may register themselves in this list to be notified of changes 336 * regarding this BDS's context */ 337 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 338 339 char filename[1024]; 340 char backing_file[1024]; /* if non zero, the image is a diff of 341 this file image */ 342 char backing_format[16]; /* if non-zero and backing_file exists */ 343 344 QDict *full_open_options; 345 char exact_filename[1024]; 346 347 BlockDriverState *backing_hd; 348 BlockDriverState *file; 349 350 NotifierList close_notifiers; 351 352 /* Callback before write request is processed */ 353 NotifierWithReturnList before_write_notifiers; 354 355 /* number of in-flight serialising requests */ 356 unsigned int serialising_in_flight; 357 358 /* I/O throttling */ 359 ThrottleState throttle_state; 360 CoQueue throttled_reqs[2]; 361 bool io_limits_enabled; 362 363 /* I/O stats (display with "info blockstats"). */ 364 BlockAcctStats stats; 365 366 /* I/O Limits */ 367 BlockLimits bl; 368 369 /* Whether the disk can expand beyond total_sectors */ 370 int growable; 371 372 /* Whether produces zeros when read beyond eof */ 373 bool zero_beyond_eof; 374 375 /* Alignment requirement for offset/length of I/O requests */ 376 unsigned int request_alignment; 377 378 /* the block size for which the guest device expects atomicity */ 379 int guest_block_size; 380 381 /* do we need to tell the quest if we have a volatile write cache? */ 382 int enable_write_cache; 383 384 /* NOTE: the following infos are only hints for real hardware 385 drivers. They are not used by the block driver */ 386 BlockdevOnError on_read_error, on_write_error; 387 bool iostatus_enabled; 388 BlockDeviceIoStatus iostatus; 389 390 /* the following member gives a name to every node on the bs graph. */ 391 char node_name[32]; 392 /* element of the list of named nodes building the graph */ 393 QTAILQ_ENTRY(BlockDriverState) node_list; 394 /* element of the list of "drives" the guest sees */ 395 QTAILQ_ENTRY(BlockDriverState) device_list; 396 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 397 int refcnt; 398 399 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 400 401 /* operation blockers */ 402 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 403 404 /* long-running background operation */ 405 BlockJob *job; 406 407 QDict *options; 408 BlockdevDetectZeroesOptions detect_zeroes; 409 410 /* The error object in use for blocking operations on backing_hd */ 411 Error *backing_blocker; 412 }; 413 414 int get_tmp_filename(char *filename, int size); 415 416 void bdrv_set_io_limits(BlockDriverState *bs, 417 ThrottleConfig *cfg); 418 419 420 /** 421 * bdrv_add_before_write_notifier: 422 * 423 * Register a callback that is invoked before write requests are processed but 424 * after any throttling or waiting for overlapping requests. 425 */ 426 void bdrv_add_before_write_notifier(BlockDriverState *bs, 427 NotifierWithReturn *notifier); 428 429 /** 430 * bdrv_detach_aio_context: 431 * 432 * May be called from .bdrv_detach_aio_context() to detach children from the 433 * current #AioContext. This is only needed by block drivers that manage their 434 * own children. Both ->file and ->backing_hd are automatically handled and 435 * block drivers should not call this function on them explicitly. 436 */ 437 void bdrv_detach_aio_context(BlockDriverState *bs); 438 439 /** 440 * bdrv_attach_aio_context: 441 * 442 * May be called from .bdrv_attach_aio_context() to attach children to the new 443 * #AioContext. This is only needed by block drivers that manage their own 444 * children. Both ->file and ->backing_hd are automatically handled and block 445 * drivers should not call this function on them explicitly. 446 */ 447 void bdrv_attach_aio_context(BlockDriverState *bs, 448 AioContext *new_context); 449 450 /** 451 * bdrv_add_aio_context_notifier: 452 * 453 * If a long-running job intends to be always run in the same AioContext as a 454 * certain BDS, it may use this function to be notified of changes regarding the 455 * association of the BDS to an AioContext. 456 * 457 * attached_aio_context() is called after the target BDS has been attached to a 458 * new AioContext; detach_aio_context() is called before the target BDS is being 459 * detached from its old AioContext. 460 */ 461 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 462 void (*attached_aio_context)(AioContext *new_context, void *opaque), 463 void (*detach_aio_context)(void *opaque), void *opaque); 464 465 /** 466 * bdrv_remove_aio_context_notifier: 467 * 468 * Unsubscribe of change notifications regarding the BDS's AioContext. The 469 * parameters given here have to be the same as those given to 470 * bdrv_add_aio_context_notifier(). 471 */ 472 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 473 void (*aio_context_attached)(AioContext *, 474 void *), 475 void (*aio_context_detached)(void *), 476 void *opaque); 477 478 #ifdef _WIN32 479 int is_windows_drive(const char *filename); 480 #endif 481 482 /** 483 * stream_start: 484 * @bs: Block device to operate on. 485 * @base: Block device that will become the new base, or %NULL to 486 * flatten the whole backing file chain onto @bs. 487 * @base_id: The file name that will be written to @bs as the new 488 * backing file if the job completes. Ignored if @base is %NULL. 489 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 490 * @on_error: The action to take upon error. 491 * @cb: Completion function for the job. 492 * @opaque: Opaque pointer value passed to @cb. 493 * @errp: Error object. 494 * 495 * Start a streaming operation on @bs. Clusters that are unallocated 496 * in @bs, but allocated in any image between @base and @bs (both 497 * exclusive) will be written to @bs. At the end of a successful 498 * streaming job, the backing file of @bs will be changed to 499 * @base_id in the written image and to @base in the live BlockDriverState. 500 */ 501 void stream_start(BlockDriverState *bs, BlockDriverState *base, 502 const char *base_id, int64_t speed, BlockdevOnError on_error, 503 BlockCompletionFunc *cb, 504 void *opaque, Error **errp); 505 506 /** 507 * commit_start: 508 * @bs: Active block device. 509 * @top: Top block device to be committed. 510 * @base: Block device that will be written into, and become the new top. 511 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 512 * @on_error: The action to take upon error. 513 * @cb: Completion function for the job. 514 * @opaque: Opaque pointer value passed to @cb. 515 * @backing_file_str: String to use as the backing file in @top's overlay 516 * @errp: Error object. 517 * 518 */ 519 void commit_start(BlockDriverState *bs, BlockDriverState *base, 520 BlockDriverState *top, int64_t speed, 521 BlockdevOnError on_error, BlockCompletionFunc *cb, 522 void *opaque, const char *backing_file_str, Error **errp); 523 /** 524 * commit_active_start: 525 * @bs: Active block device to be committed. 526 * @base: Block device that will be written into, and become the new top. 527 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 528 * @on_error: The action to take upon error. 529 * @cb: Completion function for the job. 530 * @opaque: Opaque pointer value passed to @cb. 531 * @errp: Error object. 532 * 533 */ 534 void commit_active_start(BlockDriverState *bs, BlockDriverState *base, 535 int64_t speed, 536 BlockdevOnError on_error, 537 BlockCompletionFunc *cb, 538 void *opaque, Error **errp); 539 /* 540 * mirror_start: 541 * @bs: Block device to operate on. 542 * @target: Block device to write to. 543 * @replaces: Block graph node name to replace once the mirror is done. Can 544 * only be used when full mirroring is selected. 545 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 546 * @granularity: The chosen granularity for the dirty bitmap. 547 * @buf_size: The amount of data that can be in flight at one time. 548 * @mode: Whether to collapse all images in the chain to the target. 549 * @on_source_error: The action to take upon error reading from the source. 550 * @on_target_error: The action to take upon error writing to the target. 551 * @cb: Completion function for the job. 552 * @opaque: Opaque pointer value passed to @cb. 553 * @errp: Error object. 554 * 555 * Start a mirroring operation on @bs. Clusters that are allocated 556 * in @bs will be written to @bs until the job is cancelled or 557 * manually completed. At the end of a successful mirroring job, 558 * @bs will be switched to read from @target. 559 */ 560 void mirror_start(BlockDriverState *bs, BlockDriverState *target, 561 const char *replaces, 562 int64_t speed, int64_t granularity, int64_t buf_size, 563 MirrorSyncMode mode, BlockdevOnError on_source_error, 564 BlockdevOnError on_target_error, 565 BlockCompletionFunc *cb, 566 void *opaque, Error **errp); 567 568 /* 569 * backup_start: 570 * @bs: Block device to operate on. 571 * @target: Block device to write to. 572 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 573 * @sync_mode: What parts of the disk image should be copied to the destination. 574 * @on_source_error: The action to take upon error reading from the source. 575 * @on_target_error: The action to take upon error writing to the target. 576 * @cb: Completion function for the job. 577 * @opaque: Opaque pointer value passed to @cb. 578 * 579 * Start a backup operation on @bs. Clusters in @bs are written to @target 580 * until the job is cancelled or manually completed. 581 */ 582 void backup_start(BlockDriverState *bs, BlockDriverState *target, 583 int64_t speed, MirrorSyncMode sync_mode, 584 BlockdevOnError on_source_error, 585 BlockdevOnError on_target_error, 586 BlockCompletionFunc *cb, void *opaque, 587 Error **errp); 588 589 void blk_dev_change_media_cb(BlockBackend *blk, bool load); 590 bool blk_dev_has_removable_media(BlockBackend *blk); 591 void blk_dev_eject_request(BlockBackend *blk, bool force); 592 bool blk_dev_is_tray_open(BlockBackend *blk); 593 bool blk_dev_is_medium_locked(BlockBackend *blk); 594 void blk_dev_resize_cb(BlockBackend *blk); 595 596 #endif /* BLOCK_INT_H */ 597