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 #define BLOCK_PROBE_BUF_SIZE 512 61 62 typedef struct BdrvTrackedRequest { 63 BlockDriverState *bs; 64 int64_t offset; 65 unsigned int bytes; 66 bool is_write; 67 68 bool serialising; 69 int64_t overlap_offset; 70 unsigned int overlap_bytes; 71 72 QLIST_ENTRY(BdrvTrackedRequest) list; 73 Coroutine *co; /* owner, used for deadlock detection */ 74 CoQueue wait_queue; /* coroutines blocked on this request */ 75 76 struct BdrvTrackedRequest *waiting_for; 77 } BdrvTrackedRequest; 78 79 struct BlockDriver { 80 const char *format_name; 81 int instance_size; 82 83 /* set to true if the BlockDriver is a block filter */ 84 bool is_filter; 85 /* for snapshots block filter like Quorum can implement the 86 * following recursive callback. 87 * It's purpose is to recurse on the filter children while calling 88 * bdrv_recurse_is_first_non_filter on them. 89 * For a sample implementation look in the future Quorum block filter. 90 */ 91 bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, 92 BlockDriverState *candidate); 93 94 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); 95 int (*bdrv_probe_device)(const char *filename); 96 97 /* Any driver implementing this callback is expected to be able to handle 98 * NULL file names in its .bdrv_open() implementation */ 99 void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); 100 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have 101 * this field set to true, except ones that are defined only by their 102 * child's bs. 103 * An example of the last type will be the quorum block driver. 104 */ 105 bool bdrv_needs_filename; 106 107 /* Set if a driver can support backing files */ 108 bool supports_backing; 109 110 /* For handling image reopen for split or non-split files */ 111 int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, 112 BlockReopenQueue *queue, Error **errp); 113 void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); 114 void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); 115 116 int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, 117 Error **errp); 118 int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, 119 Error **errp); 120 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, 121 uint8_t *buf, int nb_sectors); 122 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, 123 const uint8_t *buf, int nb_sectors); 124 void (*bdrv_close)(BlockDriverState *bs); 125 void (*bdrv_rebind)(BlockDriverState *bs); 126 int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp); 127 int (*bdrv_set_key)(BlockDriverState *bs, const char *key); 128 int (*bdrv_make_empty)(BlockDriverState *bs); 129 130 void (*bdrv_refresh_filename)(BlockDriverState *bs); 131 132 /* aio */ 133 BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, 134 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 135 BlockCompletionFunc *cb, void *opaque); 136 BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, 137 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 138 BlockCompletionFunc *cb, void *opaque); 139 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, 140 BlockCompletionFunc *cb, void *opaque); 141 BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs, 142 int64_t sector_num, int nb_sectors, 143 BlockCompletionFunc *cb, void *opaque); 144 145 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, 146 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 147 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, 148 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 149 /* 150 * Efficiently zero a region of the disk image. Typically an image format 151 * would use a compact metadata representation to implement this. This 152 * function pointer may be NULL and .bdrv_co_writev() will be called 153 * instead. 154 */ 155 int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs, 156 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); 157 int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, 158 int64_t sector_num, int nb_sectors); 159 int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs, 160 int64_t sector_num, int nb_sectors, int *pnum); 161 162 /* 163 * Invalidate any cached meta-data. 164 */ 165 void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp); 166 167 /* 168 * Flushes all data that was already written to the OS all the way down to 169 * the disk (for example raw-posix calls fsync()). 170 */ 171 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); 172 173 /* 174 * Flushes all internal caches to the OS. The data may still sit in a 175 * writeback cache of the host OS, but it will survive a crash of the qemu 176 * process. 177 */ 178 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); 179 180 const char *protocol_name; 181 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); 182 183 int64_t (*bdrv_getlength)(BlockDriverState *bs); 184 bool has_variable_length; 185 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); 186 187 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, 188 const uint8_t *buf, int nb_sectors); 189 190 int (*bdrv_snapshot_create)(BlockDriverState *bs, 191 QEMUSnapshotInfo *sn_info); 192 int (*bdrv_snapshot_goto)(BlockDriverState *bs, 193 const char *snapshot_id); 194 int (*bdrv_snapshot_delete)(BlockDriverState *bs, 195 const char *snapshot_id, 196 const char *name, 197 Error **errp); 198 int (*bdrv_snapshot_list)(BlockDriverState *bs, 199 QEMUSnapshotInfo **psn_info); 200 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, 201 const char *snapshot_id, 202 const char *name, 203 Error **errp); 204 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); 205 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs); 206 207 int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov, 208 int64_t pos); 209 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf, 210 int64_t pos, int size); 211 212 int (*bdrv_change_backing_file)(BlockDriverState *bs, 213 const char *backing_file, const char *backing_fmt); 214 215 /* removable device specific */ 216 int (*bdrv_is_inserted)(BlockDriverState *bs); 217 int (*bdrv_media_changed)(BlockDriverState *bs); 218 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 219 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 220 221 /* to control generic scsi devices */ 222 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); 223 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 224 unsigned long int req, void *buf, 225 BlockCompletionFunc *cb, void *opaque); 226 227 /* List of options for creating images, terminated by name == NULL */ 228 QemuOptsList *create_opts; 229 230 /* 231 * Returns 0 for completed check, -errno for internal errors. 232 * The check results are stored in result. 233 */ 234 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, 235 BdrvCheckMode fix); 236 237 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 238 BlockDriverAmendStatusCB *status_cb); 239 240 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); 241 242 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 243 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 244 const char *tag); 245 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 246 const char *tag); 247 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 248 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 249 250 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 251 252 /* 253 * Returns 1 if newly created images are guaranteed to contain only 254 * zeros, 0 otherwise. 255 */ 256 int (*bdrv_has_zero_init)(BlockDriverState *bs); 257 258 /* Remove fd handlers, timers, and other event loop callbacks so the event 259 * loop is no longer in use. Called with no in-flight requests and in 260 * depth-first traversal order with parents before child nodes. 261 */ 262 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 263 264 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 265 * can be processed again. Called with no in-flight requests and in 266 * depth-first traversal order with child nodes before parent nodes. 267 */ 268 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 269 AioContext *new_context); 270 271 /* io queue for linux-aio */ 272 void (*bdrv_io_plug)(BlockDriverState *bs); 273 void (*bdrv_io_unplug)(BlockDriverState *bs); 274 void (*bdrv_flush_io_queue)(BlockDriverState *bs); 275 276 QLIST_ENTRY(BlockDriver) list; 277 }; 278 279 typedef struct BlockLimits { 280 /* maximum number of sectors that can be discarded at once */ 281 int max_discard; 282 283 /* optimal alignment for discard requests in sectors */ 284 int64_t discard_alignment; 285 286 /* maximum number of sectors that can zeroized at once */ 287 int max_write_zeroes; 288 289 /* optimal alignment for write zeroes requests in sectors */ 290 int64_t write_zeroes_alignment; 291 292 /* optimal transfer length in sectors */ 293 int opt_transfer_length; 294 295 /* maximal transfer length in sectors */ 296 int max_transfer_length; 297 298 /* memory alignment so that no bounce buffer is needed */ 299 size_t opt_mem_alignment; 300 } BlockLimits; 301 302 typedef struct BdrvOpBlocker BdrvOpBlocker; 303 304 typedef struct BdrvAioNotifier { 305 void (*attached_aio_context)(AioContext *new_context, void *opaque); 306 void (*detach_aio_context)(void *opaque); 307 308 void *opaque; 309 310 QLIST_ENTRY(BdrvAioNotifier) list; 311 } BdrvAioNotifier; 312 313 /* 314 * Note: the function bdrv_append() copies and swaps contents of 315 * BlockDriverStates, so if you add new fields to this struct, please 316 * inspect bdrv_append() to determine if the new fields need to be 317 * copied as well. 318 */ 319 struct BlockDriverState { 320 int64_t total_sectors; /* if we are reading a disk image, give its 321 size in sectors */ 322 int read_only; /* if true, the media is read only */ 323 int open_flags; /* flags used to open the file, re-used for re-open */ 324 int encrypted; /* if true, the media is encrypted */ 325 int valid_key; /* if true, a valid encryption key has been set */ 326 int sg; /* if true, the device is a /dev/sg* */ 327 int copy_on_read; /* if true, copy read backing sectors into image 328 note this is a reference count */ 329 bool probed; 330 331 BlockDriver *drv; /* NULL means no media */ 332 void *opaque; 333 334 BlockBackend *blk; /* owning backend, if any */ 335 336 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 337 /* long-running tasks intended to always use the same AioContext as this 338 * BDS may register themselves in this list to be notified of changes 339 * regarding this BDS's context */ 340 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 341 342 char filename[PATH_MAX]; 343 char backing_file[PATH_MAX]; /* if non zero, the image is a diff of 344 this file image */ 345 char backing_format[16]; /* if non-zero and backing_file exists */ 346 347 QDict *full_open_options; 348 char exact_filename[PATH_MAX]; 349 350 BlockDriverState *backing_hd; 351 BlockDriverState *file; 352 353 NotifierList close_notifiers; 354 355 /* Callback before write request is processed */ 356 NotifierWithReturnList before_write_notifiers; 357 358 /* number of in-flight serialising requests */ 359 unsigned int serialising_in_flight; 360 361 /* I/O throttling */ 362 ThrottleState throttle_state; 363 CoQueue throttled_reqs[2]; 364 bool io_limits_enabled; 365 366 /* I/O stats (display with "info blockstats"). */ 367 BlockAcctStats stats; 368 369 /* I/O Limits */ 370 BlockLimits bl; 371 372 /* Whether the disk can expand beyond total_sectors */ 373 int growable; 374 375 /* Whether produces zeros when read beyond eof */ 376 bool zero_beyond_eof; 377 378 /* Alignment requirement for offset/length of I/O requests */ 379 unsigned int request_alignment; 380 381 /* the block size for which the guest device expects atomicity */ 382 int guest_block_size; 383 384 /* do we need to tell the quest if we have a volatile write cache? */ 385 int enable_write_cache; 386 387 /* NOTE: the following infos are only hints for real hardware 388 drivers. They are not used by the block driver */ 389 BlockdevOnError on_read_error, on_write_error; 390 bool iostatus_enabled; 391 BlockDeviceIoStatus iostatus; 392 393 /* the following member gives a name to every node on the bs graph. */ 394 char node_name[32]; 395 /* element of the list of named nodes building the graph */ 396 QTAILQ_ENTRY(BlockDriverState) node_list; 397 /* element of the list of "drives" the guest sees */ 398 QTAILQ_ENTRY(BlockDriverState) device_list; 399 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 400 int refcnt; 401 402 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 403 404 /* operation blockers */ 405 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 406 407 /* long-running background operation */ 408 BlockJob *job; 409 410 QDict *options; 411 BlockdevDetectZeroesOptions detect_zeroes; 412 413 /* The error object in use for blocking operations on backing_hd */ 414 Error *backing_blocker; 415 }; 416 417 418 /* Essential block drivers which must always be statically linked into qemu, and 419 * which therefore can be accessed without using bdrv_find_format() */ 420 extern BlockDriver bdrv_file; 421 extern BlockDriver bdrv_raw; 422 extern BlockDriver bdrv_qcow2; 423 424 425 int get_tmp_filename(char *filename, int size); 426 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, 427 const char *filename); 428 429 void bdrv_set_io_limits(BlockDriverState *bs, 430 ThrottleConfig *cfg); 431 432 433 /** 434 * bdrv_add_before_write_notifier: 435 * 436 * Register a callback that is invoked before write requests are processed but 437 * after any throttling or waiting for overlapping requests. 438 */ 439 void bdrv_add_before_write_notifier(BlockDriverState *bs, 440 NotifierWithReturn *notifier); 441 442 /** 443 * bdrv_detach_aio_context: 444 * 445 * May be called from .bdrv_detach_aio_context() to detach children from the 446 * current #AioContext. This is only needed by block drivers that manage their 447 * own children. Both ->file and ->backing_hd are automatically handled and 448 * block drivers should not call this function on them explicitly. 449 */ 450 void bdrv_detach_aio_context(BlockDriverState *bs); 451 452 /** 453 * bdrv_attach_aio_context: 454 * 455 * May be called from .bdrv_attach_aio_context() to attach children to the new 456 * #AioContext. This is only needed by block drivers that manage their own 457 * children. Both ->file and ->backing_hd are automatically handled and block 458 * drivers should not call this function on them explicitly. 459 */ 460 void bdrv_attach_aio_context(BlockDriverState *bs, 461 AioContext *new_context); 462 463 /** 464 * bdrv_add_aio_context_notifier: 465 * 466 * If a long-running job intends to be always run in the same AioContext as a 467 * certain BDS, it may use this function to be notified of changes regarding the 468 * association of the BDS to an AioContext. 469 * 470 * attached_aio_context() is called after the target BDS has been attached to a 471 * new AioContext; detach_aio_context() is called before the target BDS is being 472 * detached from its old AioContext. 473 */ 474 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 475 void (*attached_aio_context)(AioContext *new_context, void *opaque), 476 void (*detach_aio_context)(void *opaque), void *opaque); 477 478 /** 479 * bdrv_remove_aio_context_notifier: 480 * 481 * Unsubscribe of change notifications regarding the BDS's AioContext. The 482 * parameters given here have to be the same as those given to 483 * bdrv_add_aio_context_notifier(). 484 */ 485 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 486 void (*aio_context_attached)(AioContext *, 487 void *), 488 void (*aio_context_detached)(void *), 489 void *opaque); 490 491 #ifdef _WIN32 492 int is_windows_drive(const char *filename); 493 #endif 494 495 /** 496 * stream_start: 497 * @bs: Block device to operate on. 498 * @base: Block device that will become the new base, or %NULL to 499 * flatten the whole backing file chain onto @bs. 500 * @base_id: The file name that will be written to @bs as the new 501 * backing file if the job completes. Ignored if @base is %NULL. 502 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 503 * @on_error: The action to take upon error. 504 * @cb: Completion function for the job. 505 * @opaque: Opaque pointer value passed to @cb. 506 * @errp: Error object. 507 * 508 * Start a streaming operation on @bs. Clusters that are unallocated 509 * in @bs, but allocated in any image between @base and @bs (both 510 * exclusive) will be written to @bs. At the end of a successful 511 * streaming job, the backing file of @bs will be changed to 512 * @base_id in the written image and to @base in the live BlockDriverState. 513 */ 514 void stream_start(BlockDriverState *bs, BlockDriverState *base, 515 const char *base_id, int64_t speed, BlockdevOnError on_error, 516 BlockCompletionFunc *cb, 517 void *opaque, Error **errp); 518 519 /** 520 * commit_start: 521 * @bs: Active block device. 522 * @top: Top block device to be committed. 523 * @base: Block device that will be written into, and become the new top. 524 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 525 * @on_error: The action to take upon error. 526 * @cb: Completion function for the job. 527 * @opaque: Opaque pointer value passed to @cb. 528 * @backing_file_str: String to use as the backing file in @top's overlay 529 * @errp: Error object. 530 * 531 */ 532 void commit_start(BlockDriverState *bs, BlockDriverState *base, 533 BlockDriverState *top, int64_t speed, 534 BlockdevOnError on_error, BlockCompletionFunc *cb, 535 void *opaque, const char *backing_file_str, Error **errp); 536 /** 537 * commit_active_start: 538 * @bs: Active block device to be committed. 539 * @base: Block device that will be written into, and become the new top. 540 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 541 * @on_error: The action to take upon error. 542 * @cb: Completion function for the job. 543 * @opaque: Opaque pointer value passed to @cb. 544 * @errp: Error object. 545 * 546 */ 547 void commit_active_start(BlockDriverState *bs, BlockDriverState *base, 548 int64_t speed, 549 BlockdevOnError on_error, 550 BlockCompletionFunc *cb, 551 void *opaque, Error **errp); 552 /* 553 * mirror_start: 554 * @bs: Block device to operate on. 555 * @target: Block device to write to. 556 * @replaces: Block graph node name to replace once the mirror is done. Can 557 * only be used when full mirroring is selected. 558 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 559 * @granularity: The chosen granularity for the dirty bitmap. 560 * @buf_size: The amount of data that can be in flight at one time. 561 * @mode: Whether to collapse all images in the chain to the target. 562 * @on_source_error: The action to take upon error reading from the source. 563 * @on_target_error: The action to take upon error writing to the target. 564 * @cb: Completion function for the job. 565 * @opaque: Opaque pointer value passed to @cb. 566 * @errp: Error object. 567 * 568 * Start a mirroring operation on @bs. Clusters that are allocated 569 * in @bs will be written to @bs until the job is cancelled or 570 * manually completed. At the end of a successful mirroring job, 571 * @bs will be switched to read from @target. 572 */ 573 void mirror_start(BlockDriverState *bs, BlockDriverState *target, 574 const char *replaces, 575 int64_t speed, int64_t granularity, int64_t buf_size, 576 MirrorSyncMode mode, BlockdevOnError on_source_error, 577 BlockdevOnError on_target_error, 578 BlockCompletionFunc *cb, 579 void *opaque, Error **errp); 580 581 /* 582 * backup_start: 583 * @bs: Block device to operate on. 584 * @target: Block device to write to. 585 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 586 * @sync_mode: What parts of the disk image should be copied to the destination. 587 * @on_source_error: The action to take upon error reading from the source. 588 * @on_target_error: The action to take upon error writing to the target. 589 * @cb: Completion function for the job. 590 * @opaque: Opaque pointer value passed to @cb. 591 * 592 * Start a backup operation on @bs. Clusters in @bs are written to @target 593 * until the job is cancelled or manually completed. 594 */ 595 void backup_start(BlockDriverState *bs, BlockDriverState *target, 596 int64_t speed, MirrorSyncMode sync_mode, 597 BlockdevOnError on_source_error, 598 BlockdevOnError on_target_error, 599 BlockCompletionFunc *cb, void *opaque, 600 Error **errp); 601 602 void blk_dev_change_media_cb(BlockBackend *blk, bool load); 603 bool blk_dev_has_removable_media(BlockBackend *blk); 604 void blk_dev_eject_request(BlockBackend *blk, bool force); 605 bool blk_dev_is_tray_open(BlockBackend *blk); 606 bool blk_dev_is_medium_locked(BlockBackend *blk); 607 void blk_dev_resize_cb(BlockBackend *blk); 608 609 #endif /* BLOCK_INT_H */ 610