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 #define BLOCK_OPT_OBJECT_SIZE "object_size" 60 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits" 61 62 #define BLOCK_PROBE_BUF_SIZE 512 63 64 typedef struct BdrvTrackedRequest { 65 BlockDriverState *bs; 66 int64_t offset; 67 unsigned int bytes; 68 bool is_write; 69 70 bool serialising; 71 int64_t overlap_offset; 72 unsigned int overlap_bytes; 73 74 QLIST_ENTRY(BdrvTrackedRequest) list; 75 Coroutine *co; /* owner, used for deadlock detection */ 76 CoQueue wait_queue; /* coroutines blocked on this request */ 77 78 struct BdrvTrackedRequest *waiting_for; 79 } BdrvTrackedRequest; 80 81 struct BlockDriver { 82 const char *format_name; 83 int instance_size; 84 85 /* set to true if the BlockDriver is a block filter */ 86 bool is_filter; 87 /* for snapshots block filter like Quorum can implement the 88 * following recursive callback. 89 * It's purpose is to recurse on the filter children while calling 90 * bdrv_recurse_is_first_non_filter on them. 91 * For a sample implementation look in the future Quorum block filter. 92 */ 93 bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, 94 BlockDriverState *candidate); 95 96 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); 97 int (*bdrv_probe_device)(const char *filename); 98 99 /* Any driver implementing this callback is expected to be able to handle 100 * NULL file names in its .bdrv_open() implementation */ 101 void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); 102 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have 103 * this field set to true, except ones that are defined only by their 104 * child's bs. 105 * An example of the last type will be the quorum block driver. 106 */ 107 bool bdrv_needs_filename; 108 109 /* Set if a driver can support backing files */ 110 bool supports_backing; 111 112 /* For handling image reopen for split or non-split files */ 113 int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, 114 BlockReopenQueue *queue, Error **errp); 115 void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); 116 void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); 117 118 int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, 119 Error **errp); 120 int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, 121 Error **errp); 122 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, 123 uint8_t *buf, int nb_sectors); 124 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, 125 const uint8_t *buf, int nb_sectors); 126 void (*bdrv_close)(BlockDriverState *bs); 127 void (*bdrv_rebind)(BlockDriverState *bs); 128 int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp); 129 int (*bdrv_set_key)(BlockDriverState *bs, const char *key); 130 int (*bdrv_make_empty)(BlockDriverState *bs); 131 132 void (*bdrv_refresh_filename)(BlockDriverState *bs); 133 134 /* aio */ 135 BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, 136 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 137 BlockCompletionFunc *cb, void *opaque); 138 BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, 139 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 140 BlockCompletionFunc *cb, void *opaque); 141 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, 142 BlockCompletionFunc *cb, void *opaque); 143 BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs, 144 int64_t sector_num, int nb_sectors, 145 BlockCompletionFunc *cb, void *opaque); 146 147 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, 148 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 149 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, 150 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 151 /* 152 * Efficiently zero a region of the disk image. Typically an image format 153 * would use a compact metadata representation to implement this. This 154 * function pointer may be NULL and .bdrv_co_writev() will be called 155 * instead. 156 */ 157 int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs, 158 int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); 159 int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs, 160 int64_t sector_num, int nb_sectors); 161 int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs, 162 int64_t sector_num, int nb_sectors, int *pnum); 163 164 /* 165 * Invalidate any cached meta-data. 166 */ 167 void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp); 168 169 /* 170 * Flushes all data that was already written to the OS all the way down to 171 * the disk (for example raw-posix calls fsync()). 172 */ 173 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); 174 175 /* 176 * Flushes all internal caches to the OS. The data may still sit in a 177 * writeback cache of the host OS, but it will survive a crash of the qemu 178 * process. 179 */ 180 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); 181 182 const char *protocol_name; 183 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); 184 185 int64_t (*bdrv_getlength)(BlockDriverState *bs); 186 bool has_variable_length; 187 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); 188 189 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, 190 const uint8_t *buf, int nb_sectors); 191 192 int (*bdrv_snapshot_create)(BlockDriverState *bs, 193 QEMUSnapshotInfo *sn_info); 194 int (*bdrv_snapshot_goto)(BlockDriverState *bs, 195 const char *snapshot_id); 196 int (*bdrv_snapshot_delete)(BlockDriverState *bs, 197 const char *snapshot_id, 198 const char *name, 199 Error **errp); 200 int (*bdrv_snapshot_list)(BlockDriverState *bs, 201 QEMUSnapshotInfo **psn_info); 202 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, 203 const char *snapshot_id, 204 const char *name, 205 Error **errp); 206 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); 207 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs); 208 209 int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov, 210 int64_t pos); 211 int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf, 212 int64_t pos, int size); 213 214 int (*bdrv_change_backing_file)(BlockDriverState *bs, 215 const char *backing_file, const char *backing_fmt); 216 217 /* removable device specific */ 218 int (*bdrv_is_inserted)(BlockDriverState *bs); 219 int (*bdrv_media_changed)(BlockDriverState *bs); 220 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 221 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 222 223 /* to control generic scsi devices */ 224 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); 225 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 226 unsigned long int req, void *buf, 227 BlockCompletionFunc *cb, void *opaque); 228 229 /* List of options for creating images, terminated by name == NULL */ 230 QemuOptsList *create_opts; 231 232 /* 233 * Returns 0 for completed check, -errno for internal errors. 234 * The check results are stored in result. 235 */ 236 int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result, 237 BdrvCheckMode fix); 238 239 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 240 BlockDriverAmendStatusCB *status_cb); 241 242 void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event); 243 244 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 245 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 246 const char *tag); 247 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 248 const char *tag); 249 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 250 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 251 252 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 253 254 /* 255 * Returns 1 if newly created images are guaranteed to contain only 256 * zeros, 0 otherwise. 257 */ 258 int (*bdrv_has_zero_init)(BlockDriverState *bs); 259 260 /* Remove fd handlers, timers, and other event loop callbacks so the event 261 * loop is no longer in use. Called with no in-flight requests and in 262 * depth-first traversal order with parents before child nodes. 263 */ 264 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 265 266 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 267 * can be processed again. Called with no in-flight requests and in 268 * depth-first traversal order with child nodes before parent nodes. 269 */ 270 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 271 AioContext *new_context); 272 273 /* io queue for linux-aio */ 274 void (*bdrv_io_plug)(BlockDriverState *bs); 275 void (*bdrv_io_unplug)(BlockDriverState *bs); 276 void (*bdrv_flush_io_queue)(BlockDriverState *bs); 277 278 /** 279 * Try to get @bs's logical and physical block size. 280 * On success, store them in @bsz and return zero. 281 * On failure, return negative errno. 282 */ 283 int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); 284 /** 285 * Try to get @bs's geometry (cyls, heads, sectors) 286 * On success, store them in @geo and return 0. 287 * On failure return -errno. 288 * Only drivers that want to override guest geometry implement this 289 * callback; see hd_geometry_guess(). 290 */ 291 int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); 292 293 QLIST_ENTRY(BlockDriver) list; 294 }; 295 296 typedef struct BlockLimits { 297 /* maximum number of sectors that can be discarded at once */ 298 int max_discard; 299 300 /* optimal alignment for discard requests in sectors */ 301 int64_t discard_alignment; 302 303 /* maximum number of sectors that can zeroized at once */ 304 int max_write_zeroes; 305 306 /* optimal alignment for write zeroes requests in sectors */ 307 int64_t write_zeroes_alignment; 308 309 /* optimal transfer length in sectors */ 310 int opt_transfer_length; 311 312 /* maximal transfer length in sectors */ 313 int max_transfer_length; 314 315 /* memory alignment so that no bounce buffer is needed */ 316 size_t opt_mem_alignment; 317 } BlockLimits; 318 319 typedef struct BdrvOpBlocker BdrvOpBlocker; 320 321 typedef struct BdrvAioNotifier { 322 void (*attached_aio_context)(AioContext *new_context, void *opaque); 323 void (*detach_aio_context)(void *opaque); 324 325 void *opaque; 326 327 QLIST_ENTRY(BdrvAioNotifier) list; 328 } BdrvAioNotifier; 329 330 /* 331 * Note: the function bdrv_append() copies and swaps contents of 332 * BlockDriverStates, so if you add new fields to this struct, please 333 * inspect bdrv_append() to determine if the new fields need to be 334 * copied as well. 335 */ 336 struct BlockDriverState { 337 int64_t total_sectors; /* if we are reading a disk image, give its 338 size in sectors */ 339 int read_only; /* if true, the media is read only */ 340 int open_flags; /* flags used to open the file, re-used for re-open */ 341 int encrypted; /* if true, the media is encrypted */ 342 int valid_key; /* if true, a valid encryption key has been set */ 343 int sg; /* if true, the device is a /dev/sg* */ 344 int copy_on_read; /* if true, copy read backing sectors into image 345 note this is a reference count */ 346 bool probed; 347 348 BlockDriver *drv; /* NULL means no media */ 349 void *opaque; 350 351 BlockBackend *blk; /* owning backend, if any */ 352 353 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 354 /* long-running tasks intended to always use the same AioContext as this 355 * BDS may register themselves in this list to be notified of changes 356 * regarding this BDS's context */ 357 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 358 359 char filename[PATH_MAX]; 360 char backing_file[PATH_MAX]; /* if non zero, the image is a diff of 361 this file image */ 362 char backing_format[16]; /* if non-zero and backing_file exists */ 363 364 QDict *full_open_options; 365 char exact_filename[PATH_MAX]; 366 367 BlockDriverState *backing_hd; 368 BlockDriverState *file; 369 370 NotifierList close_notifiers; 371 372 /* Callback before write request is processed */ 373 NotifierWithReturnList before_write_notifiers; 374 375 /* number of in-flight serialising requests */ 376 unsigned int serialising_in_flight; 377 378 /* I/O throttling */ 379 ThrottleState throttle_state; 380 CoQueue throttled_reqs[2]; 381 bool io_limits_enabled; 382 383 /* I/O stats (display with "info blockstats"). */ 384 BlockAcctStats stats; 385 386 /* I/O Limits */ 387 BlockLimits bl; 388 389 /* Whether produces zeros when read beyond eof */ 390 bool zero_beyond_eof; 391 392 /* Alignment requirement for offset/length of I/O requests */ 393 unsigned int request_alignment; 394 395 /* the block size for which the guest device expects atomicity */ 396 int guest_block_size; 397 398 /* do we need to tell the quest if we have a volatile write cache? */ 399 int enable_write_cache; 400 401 /* NOTE: the following infos are only hints for real hardware 402 drivers. They are not used by the block driver */ 403 BlockdevOnError on_read_error, on_write_error; 404 bool iostatus_enabled; 405 BlockDeviceIoStatus iostatus; 406 407 /* the following member gives a name to every node on the bs graph. */ 408 char node_name[32]; 409 /* element of the list of named nodes building the graph */ 410 QTAILQ_ENTRY(BlockDriverState) node_list; 411 /* element of the list of "drives" the guest sees */ 412 QTAILQ_ENTRY(BlockDriverState) device_list; 413 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 414 int refcnt; 415 416 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 417 418 /* operation blockers */ 419 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 420 421 /* long-running background operation */ 422 BlockJob *job; 423 424 QDict *options; 425 BlockdevDetectZeroesOptions detect_zeroes; 426 427 /* The error object in use for blocking operations on backing_hd */ 428 Error *backing_blocker; 429 430 /* threshold limit for writes, in bytes. "High water mark". */ 431 uint64_t write_threshold_offset; 432 NotifierWithReturn write_threshold_notifier; 433 }; 434 435 436 /* Essential block drivers which must always be statically linked into qemu, and 437 * which therefore can be accessed without using bdrv_find_format() */ 438 extern BlockDriver bdrv_file; 439 extern BlockDriver bdrv_raw; 440 extern BlockDriver bdrv_qcow2; 441 442 443 int get_tmp_filename(char *filename, int size); 444 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, 445 const char *filename); 446 447 void bdrv_set_io_limits(BlockDriverState *bs, 448 ThrottleConfig *cfg); 449 450 451 /** 452 * bdrv_add_before_write_notifier: 453 * 454 * Register a callback that is invoked before write requests are processed but 455 * after any throttling or waiting for overlapping requests. 456 */ 457 void bdrv_add_before_write_notifier(BlockDriverState *bs, 458 NotifierWithReturn *notifier); 459 460 /** 461 * bdrv_detach_aio_context: 462 * 463 * May be called from .bdrv_detach_aio_context() to detach children from the 464 * current #AioContext. This is only needed by block drivers that manage their 465 * own children. Both ->file and ->backing_hd are automatically handled and 466 * block drivers should not call this function on them explicitly. 467 */ 468 void bdrv_detach_aio_context(BlockDriverState *bs); 469 470 /** 471 * bdrv_attach_aio_context: 472 * 473 * May be called from .bdrv_attach_aio_context() to attach children to the new 474 * #AioContext. This is only needed by block drivers that manage their own 475 * children. Both ->file and ->backing_hd are automatically handled and block 476 * drivers should not call this function on them explicitly. 477 */ 478 void bdrv_attach_aio_context(BlockDriverState *bs, 479 AioContext *new_context); 480 481 /** 482 * bdrv_add_aio_context_notifier: 483 * 484 * If a long-running job intends to be always run in the same AioContext as a 485 * certain BDS, it may use this function to be notified of changes regarding the 486 * association of the BDS to an AioContext. 487 * 488 * attached_aio_context() is called after the target BDS has been attached to a 489 * new AioContext; detach_aio_context() is called before the target BDS is being 490 * detached from its old AioContext. 491 */ 492 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 493 void (*attached_aio_context)(AioContext *new_context, void *opaque), 494 void (*detach_aio_context)(void *opaque), void *opaque); 495 496 /** 497 * bdrv_remove_aio_context_notifier: 498 * 499 * Unsubscribe of change notifications regarding the BDS's AioContext. The 500 * parameters given here have to be the same as those given to 501 * bdrv_add_aio_context_notifier(). 502 */ 503 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 504 void (*aio_context_attached)(AioContext *, 505 void *), 506 void (*aio_context_detached)(void *), 507 void *opaque); 508 509 #ifdef _WIN32 510 int is_windows_drive(const char *filename); 511 #endif 512 513 /** 514 * stream_start: 515 * @bs: Block device to operate on. 516 * @base: Block device that will become the new base, or %NULL to 517 * flatten the whole backing file chain onto @bs. 518 * @base_id: The file name that will be written to @bs as the new 519 * backing file if the job completes. Ignored if @base is %NULL. 520 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 521 * @on_error: The action to take upon error. 522 * @cb: Completion function for the job. 523 * @opaque: Opaque pointer value passed to @cb. 524 * @errp: Error object. 525 * 526 * Start a streaming operation on @bs. Clusters that are unallocated 527 * in @bs, but allocated in any image between @base and @bs (both 528 * exclusive) will be written to @bs. At the end of a successful 529 * streaming job, the backing file of @bs will be changed to 530 * @base_id in the written image and to @base in the live BlockDriverState. 531 */ 532 void stream_start(BlockDriverState *bs, BlockDriverState *base, 533 const char *base_id, int64_t speed, BlockdevOnError on_error, 534 BlockCompletionFunc *cb, 535 void *opaque, Error **errp); 536 537 /** 538 * commit_start: 539 * @bs: Active block device. 540 * @top: Top block device to be committed. 541 * @base: Block device that will be written into, and become the new top. 542 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 543 * @on_error: The action to take upon error. 544 * @cb: Completion function for the job. 545 * @opaque: Opaque pointer value passed to @cb. 546 * @backing_file_str: String to use as the backing file in @top's overlay 547 * @errp: Error object. 548 * 549 */ 550 void commit_start(BlockDriverState *bs, BlockDriverState *base, 551 BlockDriverState *top, int64_t speed, 552 BlockdevOnError on_error, BlockCompletionFunc *cb, 553 void *opaque, const char *backing_file_str, Error **errp); 554 /** 555 * commit_active_start: 556 * @bs: Active block device to be committed. 557 * @base: Block device that will be written into, and become the new top. 558 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 559 * @on_error: The action to take upon error. 560 * @cb: Completion function for the job. 561 * @opaque: Opaque pointer value passed to @cb. 562 * @errp: Error object. 563 * 564 */ 565 void commit_active_start(BlockDriverState *bs, BlockDriverState *base, 566 int64_t speed, 567 BlockdevOnError on_error, 568 BlockCompletionFunc *cb, 569 void *opaque, Error **errp); 570 /* 571 * mirror_start: 572 * @bs: Block device to operate on. 573 * @target: Block device to write to. 574 * @replaces: Block graph node name to replace once the mirror is done. Can 575 * only be used when full mirroring is selected. 576 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 577 * @granularity: The chosen granularity for the dirty bitmap. 578 * @buf_size: The amount of data that can be in flight at one time. 579 * @mode: Whether to collapse all images in the chain to the target. 580 * @on_source_error: The action to take upon error reading from the source. 581 * @on_target_error: The action to take upon error writing to the target. 582 * @cb: Completion function for the job. 583 * @opaque: Opaque pointer value passed to @cb. 584 * @errp: Error object. 585 * 586 * Start a mirroring operation on @bs. Clusters that are allocated 587 * in @bs will be written to @bs until the job is cancelled or 588 * manually completed. At the end of a successful mirroring job, 589 * @bs will be switched to read from @target. 590 */ 591 void mirror_start(BlockDriverState *bs, BlockDriverState *target, 592 const char *replaces, 593 int64_t speed, int64_t granularity, int64_t buf_size, 594 MirrorSyncMode mode, BlockdevOnError on_source_error, 595 BlockdevOnError on_target_error, 596 BlockCompletionFunc *cb, 597 void *opaque, Error **errp); 598 599 /* 600 * backup_start: 601 * @bs: Block device to operate on. 602 * @target: Block device to write to. 603 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 604 * @sync_mode: What parts of the disk image should be copied to the destination. 605 * @on_source_error: The action to take upon error reading from the source. 606 * @on_target_error: The action to take upon error writing to the target. 607 * @cb: Completion function for the job. 608 * @opaque: Opaque pointer value passed to @cb. 609 * 610 * Start a backup operation on @bs. Clusters in @bs are written to @target 611 * until the job is cancelled or manually completed. 612 */ 613 void backup_start(BlockDriverState *bs, BlockDriverState *target, 614 int64_t speed, MirrorSyncMode sync_mode, 615 BlockdevOnError on_source_error, 616 BlockdevOnError on_target_error, 617 BlockCompletionFunc *cb, void *opaque, 618 Error **errp); 619 620 void blk_dev_change_media_cb(BlockBackend *blk, bool load); 621 bool blk_dev_has_removable_media(BlockBackend *blk); 622 void blk_dev_eject_request(BlockBackend *blk, bool force); 623 bool blk_dev_is_tray_open(BlockBackend *blk); 624 bool blk_dev_is_medium_locked(BlockBackend *blk); 625 void blk_dev_resize_cb(BlockBackend *blk); 626 627 #endif /* BLOCK_INT_H */ 628