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/aio-wait.h" 30 #include "qemu/queue.h" 31 #include "qemu/coroutine.h" 32 #include "qemu/stats64.h" 33 #include "qemu/timer.h" 34 #include "qemu/hbitmap.h" 35 #include "block/snapshot.h" 36 #include "qemu/main-loop.h" 37 #include "qemu/throttle.h" 38 39 #define BLOCK_FLAG_LAZY_REFCOUNTS 8 40 41 #define BLOCK_OPT_SIZE "size" 42 #define BLOCK_OPT_ENCRYPT "encryption" 43 #define BLOCK_OPT_ENCRYPT_FORMAT "encrypt.format" 44 #define BLOCK_OPT_COMPAT6 "compat6" 45 #define BLOCK_OPT_HWVERSION "hwversion" 46 #define BLOCK_OPT_BACKING_FILE "backing_file" 47 #define BLOCK_OPT_BACKING_FMT "backing_fmt" 48 #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" 49 #define BLOCK_OPT_TABLE_SIZE "table_size" 50 #define BLOCK_OPT_PREALLOC "preallocation" 51 #define BLOCK_OPT_SUBFMT "subformat" 52 #define BLOCK_OPT_COMPAT_LEVEL "compat" 53 #define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts" 54 #define BLOCK_OPT_ADAPTER_TYPE "adapter_type" 55 #define BLOCK_OPT_REDUNDANCY "redundancy" 56 #define BLOCK_OPT_NOCOW "nocow" 57 #define BLOCK_OPT_OBJECT_SIZE "object_size" 58 #define BLOCK_OPT_REFCOUNT_BITS "refcount_bits" 59 60 #define BLOCK_PROBE_BUF_SIZE 512 61 62 enum BdrvTrackedRequestType { 63 BDRV_TRACKED_READ, 64 BDRV_TRACKED_WRITE, 65 BDRV_TRACKED_DISCARD, 66 BDRV_TRACKED_TRUNCATE, 67 }; 68 69 typedef struct BdrvTrackedRequest { 70 BlockDriverState *bs; 71 int64_t offset; 72 uint64_t bytes; 73 enum BdrvTrackedRequestType type; 74 75 bool serialising; 76 int64_t overlap_offset; 77 uint64_t overlap_bytes; 78 79 QLIST_ENTRY(BdrvTrackedRequest) list; 80 Coroutine *co; /* owner, used for deadlock detection */ 81 CoQueue wait_queue; /* coroutines blocked on this request */ 82 83 struct BdrvTrackedRequest *waiting_for; 84 } BdrvTrackedRequest; 85 86 struct BlockDriver { 87 const char *format_name; 88 int instance_size; 89 90 /* set to true if the BlockDriver is a block filter. Block filters pass 91 * certain callbacks that refer to data (see block.c) to their bs->file if 92 * the driver doesn't implement them. Drivers that do not wish to forward 93 * must implement them and return -ENOTSUP. 94 */ 95 bool is_filter; 96 /* for snapshots block filter like Quorum can implement the 97 * following recursive callback. 98 * It's purpose is to recurse on the filter children while calling 99 * bdrv_recurse_is_first_non_filter on them. 100 * For a sample implementation look in the future Quorum block filter. 101 */ 102 bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs, 103 BlockDriverState *candidate); 104 105 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); 106 int (*bdrv_probe_device)(const char *filename); 107 108 /* Any driver implementing this callback is expected to be able to handle 109 * NULL file names in its .bdrv_open() implementation */ 110 void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp); 111 /* Drivers not implementing bdrv_parse_filename nor bdrv_open should have 112 * this field set to true, except ones that are defined only by their 113 * child's bs. 114 * An example of the last type will be the quorum block driver. 115 */ 116 bool bdrv_needs_filename; 117 118 /* Set if a driver can support backing files */ 119 bool supports_backing; 120 121 /* For handling image reopen for split or non-split files */ 122 int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state, 123 BlockReopenQueue *queue, Error **errp); 124 void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state); 125 void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state); 126 void (*bdrv_join_options)(QDict *options, QDict *old_options); 127 128 int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags, 129 Error **errp); 130 131 /* Protocol drivers should implement this instead of bdrv_open */ 132 int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags, 133 Error **errp); 134 void (*bdrv_close)(BlockDriverState *bs); 135 int coroutine_fn (*bdrv_co_create)(BlockdevCreateOptions *opts, 136 Error **errp); 137 int coroutine_fn (*bdrv_co_create_opts)(const char *filename, 138 QemuOpts *opts, 139 Error **errp); 140 int (*bdrv_make_empty)(BlockDriverState *bs); 141 142 void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options); 143 144 /* aio */ 145 BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs, 146 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags, 147 BlockCompletionFunc *cb, void *opaque); 148 BlockAIOCB *(*bdrv_aio_pwritev)(BlockDriverState *bs, 149 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags, 150 BlockCompletionFunc *cb, void *opaque); 151 BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, 152 BlockCompletionFunc *cb, void *opaque); 153 BlockAIOCB *(*bdrv_aio_pdiscard)(BlockDriverState *bs, 154 int64_t offset, int bytes, 155 BlockCompletionFunc *cb, void *opaque); 156 157 int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs, 158 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov); 159 160 /** 161 * @offset: position in bytes to read at 162 * @bytes: number of bytes to read 163 * @qiov: the buffers to fill with read data 164 * @flags: currently unused, always 0 165 * 166 * @offset and @bytes will be a multiple of 'request_alignment', 167 * but the length of individual @qiov elements does not have to 168 * be a multiple. 169 * 170 * @bytes will always equal the total size of @qiov, and will be 171 * no larger than 'max_transfer'. 172 * 173 * The buffer in @qiov may point directly to guest memory. 174 */ 175 int coroutine_fn (*bdrv_co_preadv)(BlockDriverState *bs, 176 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags); 177 int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs, 178 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int flags); 179 /** 180 * @offset: position in bytes to write at 181 * @bytes: number of bytes to write 182 * @qiov: the buffers containing data to write 183 * @flags: zero or more bits allowed by 'supported_write_flags' 184 * 185 * @offset and @bytes will be a multiple of 'request_alignment', 186 * but the length of individual @qiov elements does not have to 187 * be a multiple. 188 * 189 * @bytes will always equal the total size of @qiov, and will be 190 * no larger than 'max_transfer'. 191 * 192 * The buffer in @qiov may point directly to guest memory. 193 */ 194 int coroutine_fn (*bdrv_co_pwritev)(BlockDriverState *bs, 195 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags); 196 197 /* 198 * Efficiently zero a region of the disk image. Typically an image format 199 * would use a compact metadata representation to implement this. This 200 * function pointer may be NULL or return -ENOSUP and .bdrv_co_writev() 201 * will be called instead. 202 */ 203 int coroutine_fn (*bdrv_co_pwrite_zeroes)(BlockDriverState *bs, 204 int64_t offset, int bytes, BdrvRequestFlags flags); 205 int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs, 206 int64_t offset, int bytes); 207 208 /* Map [offset, offset + nbytes) range onto a child of @bs to copy from, 209 * and invoke bdrv_co_copy_range_from(child, ...), or invoke 210 * bdrv_co_copy_range_to() if @bs is the leaf child to copy data from. 211 * 212 * See the comment of bdrv_co_copy_range for the parameter and return value 213 * semantics. 214 */ 215 int coroutine_fn (*bdrv_co_copy_range_from)(BlockDriverState *bs, 216 BdrvChild *src, 217 uint64_t offset, 218 BdrvChild *dst, 219 uint64_t dst_offset, 220 uint64_t bytes, 221 BdrvRequestFlags read_flags, 222 BdrvRequestFlags write_flags); 223 224 /* Map [offset, offset + nbytes) range onto a child of bs to copy data to, 225 * and invoke bdrv_co_copy_range_to(child, src, ...), or perform the copy 226 * operation if @bs is the leaf and @src has the same BlockDriver. Return 227 * -ENOTSUP if @bs is the leaf but @src has a different BlockDriver. 228 * 229 * See the comment of bdrv_co_copy_range for the parameter and return value 230 * semantics. 231 */ 232 int coroutine_fn (*bdrv_co_copy_range_to)(BlockDriverState *bs, 233 BdrvChild *src, 234 uint64_t src_offset, 235 BdrvChild *dst, 236 uint64_t dst_offset, 237 uint64_t bytes, 238 BdrvRequestFlags read_flags, 239 BdrvRequestFlags write_flags); 240 241 /* 242 * Building block for bdrv_block_status[_above] and 243 * bdrv_is_allocated[_above]. The driver should answer only 244 * according to the current layer, and should only need to set 245 * BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID, 246 * and/or BDRV_BLOCK_RAW; if the current layer defers to a backing 247 * layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See 248 * block.h for the overall meaning of the bits. As a hint, the 249 * flag want_zero is true if the caller cares more about precise 250 * mappings (favor accurate _OFFSET_VALID/_ZERO) or false for 251 * overall allocation (favor larger *pnum, perhaps by reporting 252 * _DATA instead of _ZERO). The block layer guarantees input 253 * clamped to bdrv_getlength() and aligned to request_alignment, 254 * as well as non-NULL pnum, map, and file; in turn, the driver 255 * must return an error or set pnum to an aligned non-zero value. 256 */ 257 int coroutine_fn (*bdrv_co_block_status)(BlockDriverState *bs, 258 bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum, 259 int64_t *map, BlockDriverState **file); 260 261 /* 262 * Invalidate any cached meta-data. 263 */ 264 void coroutine_fn (*bdrv_co_invalidate_cache)(BlockDriverState *bs, 265 Error **errp); 266 int (*bdrv_inactivate)(BlockDriverState *bs); 267 268 /* 269 * Flushes all data for all layers by calling bdrv_co_flush for underlying 270 * layers, if needed. This function is needed for deterministic 271 * synchronization of the flush finishing callback. 272 */ 273 int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs); 274 275 /* 276 * Flushes all data that was already written to the OS all the way down to 277 * the disk (for example file-posix.c calls fsync()). 278 */ 279 int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs); 280 281 /* 282 * Flushes all internal caches to the OS. The data may still sit in a 283 * writeback cache of the host OS, but it will survive a crash of the qemu 284 * process. 285 */ 286 int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs); 287 288 /* 289 * Drivers setting this field must be able to work with just a plain 290 * filename with '<protocol_name>:' as a prefix, and no other options. 291 * Options may be extracted from the filename by implementing 292 * bdrv_parse_filename. 293 */ 294 const char *protocol_name; 295 int coroutine_fn (*bdrv_co_truncate)(BlockDriverState *bs, int64_t offset, 296 PreallocMode prealloc, Error **errp); 297 298 int64_t (*bdrv_getlength)(BlockDriverState *bs); 299 bool has_variable_length; 300 int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs); 301 BlockMeasureInfo *(*bdrv_measure)(QemuOpts *opts, BlockDriverState *in_bs, 302 Error **errp); 303 304 int coroutine_fn (*bdrv_co_pwritev_compressed)(BlockDriverState *bs, 305 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov); 306 307 int (*bdrv_snapshot_create)(BlockDriverState *bs, 308 QEMUSnapshotInfo *sn_info); 309 int (*bdrv_snapshot_goto)(BlockDriverState *bs, 310 const char *snapshot_id); 311 int (*bdrv_snapshot_delete)(BlockDriverState *bs, 312 const char *snapshot_id, 313 const char *name, 314 Error **errp); 315 int (*bdrv_snapshot_list)(BlockDriverState *bs, 316 QEMUSnapshotInfo **psn_info); 317 int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs, 318 const char *snapshot_id, 319 const char *name, 320 Error **errp); 321 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); 322 ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs); 323 324 int coroutine_fn (*bdrv_save_vmstate)(BlockDriverState *bs, 325 QEMUIOVector *qiov, 326 int64_t pos); 327 int coroutine_fn (*bdrv_load_vmstate)(BlockDriverState *bs, 328 QEMUIOVector *qiov, 329 int64_t pos); 330 331 int (*bdrv_change_backing_file)(BlockDriverState *bs, 332 const char *backing_file, const char *backing_fmt); 333 334 /* removable device specific */ 335 bool (*bdrv_is_inserted)(BlockDriverState *bs); 336 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 337 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 338 339 /* to control generic scsi devices */ 340 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 341 unsigned long int req, void *buf, 342 BlockCompletionFunc *cb, void *opaque); 343 int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs, 344 unsigned long int req, void *buf); 345 346 /* List of options for creating images, terminated by name == NULL */ 347 QemuOptsList *create_opts; 348 349 /* 350 * Returns 0 for completed check, -errno for internal errors. 351 * The check results are stored in result. 352 */ 353 int coroutine_fn (*bdrv_co_check)(BlockDriverState *bs, 354 BdrvCheckResult *result, 355 BdrvCheckMode fix); 356 357 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 358 BlockDriverAmendStatusCB *status_cb, 359 void *cb_opaque, 360 Error **errp); 361 362 void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event); 363 364 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 365 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 366 const char *tag); 367 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 368 const char *tag); 369 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 370 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 371 372 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 373 374 /* 375 * Returns 1 if newly created images are guaranteed to contain only 376 * zeros, 0 otherwise. 377 */ 378 int (*bdrv_has_zero_init)(BlockDriverState *bs); 379 380 /* Remove fd handlers, timers, and other event loop callbacks so the event 381 * loop is no longer in use. Called with no in-flight requests and in 382 * depth-first traversal order with parents before child nodes. 383 */ 384 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 385 386 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 387 * can be processed again. Called with no in-flight requests and in 388 * depth-first traversal order with child nodes before parent nodes. 389 */ 390 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 391 AioContext *new_context); 392 393 /* io queue for linux-aio */ 394 void (*bdrv_io_plug)(BlockDriverState *bs); 395 void (*bdrv_io_unplug)(BlockDriverState *bs); 396 397 /** 398 * Try to get @bs's logical and physical block size. 399 * On success, store them in @bsz and return zero. 400 * On failure, return negative errno. 401 */ 402 int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); 403 /** 404 * Try to get @bs's geometry (cyls, heads, sectors) 405 * On success, store them in @geo and return 0. 406 * On failure return -errno. 407 * Only drivers that want to override guest geometry implement this 408 * callback; see hd_geometry_guess(). 409 */ 410 int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); 411 412 /** 413 * bdrv_co_drain_begin is called if implemented in the beginning of a 414 * drain operation to drain and stop any internal sources of requests in 415 * the driver. 416 * bdrv_co_drain_end is called if implemented at the end of the drain. 417 * 418 * They should be used by the driver to e.g. manage scheduled I/O 419 * requests, or toggle an internal state. After the end of the drain new 420 * requests will continue normally. 421 */ 422 void coroutine_fn (*bdrv_co_drain_begin)(BlockDriverState *bs); 423 void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs); 424 425 void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child, 426 Error **errp); 427 void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child, 428 Error **errp); 429 430 /** 431 * Informs the block driver that a permission change is intended. The 432 * driver checks whether the change is permissible and may take other 433 * preparations for the change (e.g. get file system locks). This operation 434 * is always followed either by a call to either .bdrv_set_perm or 435 * .bdrv_abort_perm_update. 436 * 437 * Checks whether the requested set of cumulative permissions in @perm 438 * can be granted for accessing @bs and whether no other users are using 439 * permissions other than those given in @shared (both arguments take 440 * BLK_PERM_* bitmasks). 441 * 442 * If both conditions are met, 0 is returned. Otherwise, -errno is returned 443 * and errp is set to an error describing the conflict. 444 */ 445 int (*bdrv_check_perm)(BlockDriverState *bs, uint64_t perm, 446 uint64_t shared, Error **errp); 447 448 /** 449 * Called to inform the driver that the set of cumulative set of used 450 * permissions for @bs has changed to @perm, and the set of sharable 451 * permission to @shared. The driver can use this to propagate changes to 452 * its children (i.e. request permissions only if a parent actually needs 453 * them). 454 * 455 * This function is only invoked after bdrv_check_perm(), so block drivers 456 * may rely on preparations made in their .bdrv_check_perm implementation. 457 */ 458 void (*bdrv_set_perm)(BlockDriverState *bs, uint64_t perm, uint64_t shared); 459 460 /* 461 * Called to inform the driver that after a previous bdrv_check_perm() 462 * call, the permission update is not performed and any preparations made 463 * for it (e.g. taken file locks) need to be undone. 464 * 465 * This function can be called even for nodes that never saw a 466 * bdrv_check_perm() call. It is a no-op then. 467 */ 468 void (*bdrv_abort_perm_update)(BlockDriverState *bs); 469 470 /** 471 * Returns in @nperm and @nshared the permissions that the driver for @bs 472 * needs on its child @c, based on the cumulative permissions requested by 473 * the parents in @parent_perm and @parent_shared. 474 * 475 * If @c is NULL, return the permissions for attaching a new child for the 476 * given @role. 477 * 478 * If @reopen_queue is non-NULL, don't return the currently needed 479 * permissions, but those that will be needed after applying the 480 * @reopen_queue. 481 */ 482 void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c, 483 const BdrvChildRole *role, 484 BlockReopenQueue *reopen_queue, 485 uint64_t parent_perm, uint64_t parent_shared, 486 uint64_t *nperm, uint64_t *nshared); 487 488 /** 489 * Bitmaps should be marked as 'IN_USE' in the image on reopening image 490 * as rw. This handler should realize it. It also should unset readonly 491 * field of BlockDirtyBitmap's in case of success. 492 */ 493 int (*bdrv_reopen_bitmaps_rw)(BlockDriverState *bs, Error **errp); 494 bool (*bdrv_can_store_new_dirty_bitmap)(BlockDriverState *bs, 495 const char *name, 496 uint32_t granularity, 497 Error **errp); 498 void (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs, 499 const char *name, 500 Error **errp); 501 502 /** 503 * Register/unregister a buffer for I/O. For example, when the driver is 504 * interested to know the memory areas that will later be used in iovs, so 505 * that it can do IOMMU mapping with VFIO etc., in order to get better 506 * performance. In the case of VFIO drivers, this callback is used to do 507 * DMA mapping for hot buffers. 508 */ 509 void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size); 510 void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host); 511 QLIST_ENTRY(BlockDriver) list; 512 }; 513 514 typedef struct BlockLimits { 515 /* Alignment requirement, in bytes, for offset/length of I/O 516 * requests. Must be a power of 2 less than INT_MAX; defaults to 517 * 1 for drivers with modern byte interfaces, and to 512 518 * otherwise. */ 519 uint32_t request_alignment; 520 521 /* Maximum number of bytes that can be discarded at once (since it 522 * is signed, it must be < 2G, if set). Must be multiple of 523 * pdiscard_alignment, but need not be power of 2. May be 0 if no 524 * inherent 32-bit limit */ 525 int32_t max_pdiscard; 526 527 /* Optimal alignment for discard requests in bytes. A power of 2 528 * is best but not mandatory. Must be a multiple of 529 * bl.request_alignment, and must be less than max_pdiscard if 530 * that is set. May be 0 if bl.request_alignment is good enough */ 531 uint32_t pdiscard_alignment; 532 533 /* Maximum number of bytes that can zeroized at once (since it is 534 * signed, it must be < 2G, if set). Must be multiple of 535 * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */ 536 int32_t max_pwrite_zeroes; 537 538 /* Optimal alignment for write zeroes requests in bytes. A power 539 * of 2 is best but not mandatory. Must be a multiple of 540 * bl.request_alignment, and must be less than max_pwrite_zeroes 541 * if that is set. May be 0 if bl.request_alignment is good 542 * enough */ 543 uint32_t pwrite_zeroes_alignment; 544 545 /* Optimal transfer length in bytes. A power of 2 is best but not 546 * mandatory. Must be a multiple of bl.request_alignment, or 0 if 547 * no preferred size */ 548 uint32_t opt_transfer; 549 550 /* Maximal transfer length in bytes. Need not be power of 2, but 551 * must be multiple of opt_transfer and bl.request_alignment, or 0 552 * for no 32-bit limit. For now, anything larger than INT_MAX is 553 * clamped down. */ 554 uint32_t max_transfer; 555 556 /* memory alignment, in bytes so that no bounce buffer is needed */ 557 size_t min_mem_alignment; 558 559 /* memory alignment, in bytes, for bounce buffer */ 560 size_t opt_mem_alignment; 561 562 /* maximum number of iovec elements */ 563 int max_iov; 564 } BlockLimits; 565 566 typedef struct BdrvOpBlocker BdrvOpBlocker; 567 568 typedef struct BdrvAioNotifier { 569 void (*attached_aio_context)(AioContext *new_context, void *opaque); 570 void (*detach_aio_context)(void *opaque); 571 572 void *opaque; 573 bool deleted; 574 575 QLIST_ENTRY(BdrvAioNotifier) list; 576 } BdrvAioNotifier; 577 578 struct BdrvChildRole { 579 /* If true, bdrv_replace_node() doesn't change the node this BdrvChild 580 * points to. */ 581 bool stay_at_node; 582 583 /* If true, the parent is a BlockDriverState and bdrv_next_all_states() 584 * will return it. This information is used for drain_all, where every node 585 * will be drained separately, so the drain only needs to be propagated to 586 * non-BDS parents. */ 587 bool parent_is_bds; 588 589 void (*inherit_options)(int *child_flags, QDict *child_options, 590 int parent_flags, QDict *parent_options); 591 592 void (*change_media)(BdrvChild *child, bool load); 593 void (*resize)(BdrvChild *child); 594 595 /* Returns a name that is supposedly more useful for human users than the 596 * node name for identifying the node in question (in particular, a BB 597 * name), or NULL if the parent can't provide a better name. */ 598 const char *(*get_name)(BdrvChild *child); 599 600 /* Returns a malloced string that describes the parent of the child for a 601 * human reader. This could be a node-name, BlockBackend name, qdev ID or 602 * QOM path of the device owning the BlockBackend, job type and ID etc. The 603 * caller is responsible for freeing the memory. */ 604 char *(*get_parent_desc)(BdrvChild *child); 605 606 /* 607 * If this pair of functions is implemented, the parent doesn't issue new 608 * requests after returning from .drained_begin() until .drained_end() is 609 * called. 610 * 611 * These functions must not change the graph (and therefore also must not 612 * call aio_poll(), which could change the graph indirectly). 613 * 614 * Note that this can be nested. If drained_begin() was called twice, new 615 * I/O is allowed only after drained_end() was called twice, too. 616 */ 617 void (*drained_begin)(BdrvChild *child); 618 void (*drained_end)(BdrvChild *child); 619 620 /* 621 * Returns whether the parent has pending requests for the child. This 622 * callback is polled after .drained_begin() has been called until all 623 * activity on the child has stopped. 624 */ 625 bool (*drained_poll)(BdrvChild *child); 626 627 /* Notifies the parent that the child has been activated/inactivated (e.g. 628 * when migration is completing) and it can start/stop requesting 629 * permissions and doing I/O on it. */ 630 void (*activate)(BdrvChild *child, Error **errp); 631 int (*inactivate)(BdrvChild *child); 632 633 void (*attach)(BdrvChild *child); 634 void (*detach)(BdrvChild *child); 635 636 /* Notifies the parent that the filename of its child has changed (e.g. 637 * because the direct child was removed from the backing chain), so that it 638 * can update its reference. */ 639 int (*update_filename)(BdrvChild *child, BlockDriverState *new_base, 640 const char *filename, Error **errp); 641 }; 642 643 extern const BdrvChildRole child_file; 644 extern const BdrvChildRole child_format; 645 extern const BdrvChildRole child_backing; 646 647 struct BdrvChild { 648 BlockDriverState *bs; 649 char *name; 650 const BdrvChildRole *role; 651 void *opaque; 652 653 /** 654 * Granted permissions for operating on this BdrvChild (BLK_PERM_* bitmask) 655 */ 656 uint64_t perm; 657 658 /** 659 * Permissions that can still be granted to other users of @bs while this 660 * BdrvChild is still attached to it. (BLK_PERM_* bitmask) 661 */ 662 uint64_t shared_perm; 663 664 QLIST_ENTRY(BdrvChild) next; 665 QLIST_ENTRY(BdrvChild) next_parent; 666 }; 667 668 /* 669 * Note: the function bdrv_append() copies and swaps contents of 670 * BlockDriverStates, so if you add new fields to this struct, please 671 * inspect bdrv_append() to determine if the new fields need to be 672 * copied as well. 673 */ 674 struct BlockDriverState { 675 /* Protected by big QEMU lock or read-only after opening. No special 676 * locking needed during I/O... 677 */ 678 int open_flags; /* flags used to open the file, re-used for re-open */ 679 bool read_only; /* if true, the media is read only */ 680 bool encrypted; /* if true, the media is encrypted */ 681 bool sg; /* if true, the device is a /dev/sg* */ 682 bool probed; /* if true, format was probed rather than specified */ 683 bool force_share; /* if true, always allow all shared permissions */ 684 bool implicit; /* if true, this filter node was automatically inserted */ 685 686 BlockDriver *drv; /* NULL means no media */ 687 void *opaque; 688 689 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 690 /* long-running tasks intended to always use the same AioContext as this 691 * BDS may register themselves in this list to be notified of changes 692 * regarding this BDS's context */ 693 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 694 bool walking_aio_notifiers; /* to make removal during iteration safe */ 695 696 char filename[PATH_MAX]; 697 char backing_file[PATH_MAX]; /* if non zero, the image is a diff of 698 this file image */ 699 char backing_format[16]; /* if non-zero and backing_file exists */ 700 701 QDict *full_open_options; 702 char exact_filename[PATH_MAX]; 703 704 BdrvChild *backing; 705 BdrvChild *file; 706 707 /* I/O Limits */ 708 BlockLimits bl; 709 710 /* Flags honored during pwrite (so far: BDRV_REQ_FUA, 711 * BDRV_REQ_WRITE_UNCHANGED). 712 * If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those 713 * writes will be issued as normal writes without the flag set. 714 * This is important to note for drivers that do not explicitly 715 * request a WRITE permission for their children and instead take 716 * the same permissions as their parent did (this is commonly what 717 * block filters do). Such drivers have to be aware that the 718 * parent may have taken a WRITE_UNCHANGED permission only and is 719 * issuing such requests. Drivers either must make sure that 720 * these requests do not result in plain WRITE accesses (usually 721 * by supporting BDRV_REQ_WRITE_UNCHANGED, and then forwarding 722 * every incoming write request as-is, including potentially that 723 * flag), or they have to explicitly take the WRITE permission for 724 * their children. */ 725 unsigned int supported_write_flags; 726 /* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA, 727 * BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */ 728 unsigned int supported_zero_flags; 729 730 /* the following member gives a name to every node on the bs graph. */ 731 char node_name[32]; 732 /* element of the list of named nodes building the graph */ 733 QTAILQ_ENTRY(BlockDriverState) node_list; 734 /* element of the list of all BlockDriverStates (all_bdrv_states) */ 735 QTAILQ_ENTRY(BlockDriverState) bs_list; 736 /* element of the list of monitor-owned BDS */ 737 QTAILQ_ENTRY(BlockDriverState) monitor_list; 738 int refcnt; 739 740 /* operation blockers */ 741 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 742 743 /* long-running background operation */ 744 BlockJob *job; 745 746 /* The node that this node inherited default options from (and a reopen on 747 * which can affect this node by changing these defaults). This is always a 748 * parent node of this node. */ 749 BlockDriverState *inherits_from; 750 QLIST_HEAD(, BdrvChild) children; 751 QLIST_HEAD(, BdrvChild) parents; 752 753 QDict *options; 754 QDict *explicit_options; 755 BlockdevDetectZeroesOptions detect_zeroes; 756 757 /* The error object in use for blocking operations on backing_hd */ 758 Error *backing_blocker; 759 760 /* Protected by AioContext lock */ 761 762 /* If we are reading a disk image, give its size in sectors. 763 * Generally read-only; it is written to by load_snapshot and 764 * save_snaphost, but the block layer is quiescent during those. 765 */ 766 int64_t total_sectors; 767 768 /* Callback before write request is processed */ 769 NotifierWithReturnList before_write_notifiers; 770 771 /* threshold limit for writes, in bytes. "High water mark". */ 772 uint64_t write_threshold_offset; 773 NotifierWithReturn write_threshold_notifier; 774 775 /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex. 776 * Reading from the list can be done with either the BQL or the 777 * dirty_bitmap_mutex. Modifying a bitmap only requires 778 * dirty_bitmap_mutex. */ 779 QemuMutex dirty_bitmap_mutex; 780 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 781 782 /* Offset after the highest byte written to */ 783 Stat64 wr_highest_offset; 784 785 /* If true, copy read backing sectors into image. Can be >1 if more 786 * than one client has requested copy-on-read. Accessed with atomic 787 * ops. 788 */ 789 int copy_on_read; 790 791 /* number of in-flight requests; overall and serialising. 792 * Accessed with atomic ops. 793 */ 794 unsigned int in_flight; 795 unsigned int serialising_in_flight; 796 797 /* counter for nested bdrv_io_plug. 798 * Accessed with atomic ops. 799 */ 800 unsigned io_plugged; 801 802 /* do we need to tell the quest if we have a volatile write cache? */ 803 int enable_write_cache; 804 805 /* Accessed with atomic ops. */ 806 int quiesce_counter; 807 int recursive_quiesce_counter; 808 809 unsigned int write_gen; /* Current data generation */ 810 811 /* Protected by reqs_lock. */ 812 CoMutex reqs_lock; 813 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 814 CoQueue flush_queue; /* Serializing flush queue */ 815 bool active_flush_req; /* Flush request in flight? */ 816 817 /* Only read/written by whoever has set active_flush_req to true. */ 818 unsigned int flushed_gen; /* Flushed write generation */ 819 }; 820 821 struct BlockBackendRootState { 822 int open_flags; 823 bool read_only; 824 BlockdevDetectZeroesOptions detect_zeroes; 825 }; 826 827 typedef enum BlockMirrorBackingMode { 828 /* Reuse the existing backing chain from the source for the target. 829 * - sync=full: Set backing BDS to NULL. 830 * - sync=top: Use source's backing BDS. 831 * - sync=none: Use source as the backing BDS. */ 832 MIRROR_SOURCE_BACKING_CHAIN, 833 834 /* Open the target's backing chain completely anew */ 835 MIRROR_OPEN_BACKING_CHAIN, 836 837 /* Do not change the target's backing BDS after job completion */ 838 MIRROR_LEAVE_BACKING_CHAIN, 839 } BlockMirrorBackingMode; 840 841 static inline BlockDriverState *backing_bs(BlockDriverState *bs) 842 { 843 return bs->backing ? bs->backing->bs : NULL; 844 } 845 846 847 /* Essential block drivers which must always be statically linked into qemu, and 848 * which therefore can be accessed without using bdrv_find_format() */ 849 extern BlockDriver bdrv_file; 850 extern BlockDriver bdrv_raw; 851 extern BlockDriver bdrv_qcow2; 852 853 int coroutine_fn bdrv_co_preadv(BdrvChild *child, 854 int64_t offset, unsigned int bytes, QEMUIOVector *qiov, 855 BdrvRequestFlags flags); 856 int coroutine_fn bdrv_co_pwritev(BdrvChild *child, 857 int64_t offset, unsigned int bytes, QEMUIOVector *qiov, 858 BdrvRequestFlags flags); 859 860 extern unsigned int bdrv_drain_all_count; 861 void bdrv_apply_subtree_drain(BdrvChild *child, BlockDriverState *new_parent); 862 void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent); 863 864 int get_tmp_filename(char *filename, int size); 865 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, 866 const char *filename); 867 868 void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, 869 QDict *options); 870 871 872 /** 873 * bdrv_add_before_write_notifier: 874 * 875 * Register a callback that is invoked before write requests are processed but 876 * after any throttling or waiting for overlapping requests. 877 */ 878 void bdrv_add_before_write_notifier(BlockDriverState *bs, 879 NotifierWithReturn *notifier); 880 881 /** 882 * bdrv_detach_aio_context: 883 * 884 * May be called from .bdrv_detach_aio_context() to detach children from the 885 * current #AioContext. This is only needed by block drivers that manage their 886 * own children. Both ->file and ->backing are automatically handled and 887 * block drivers should not call this function on them explicitly. 888 */ 889 void bdrv_detach_aio_context(BlockDriverState *bs); 890 891 /** 892 * bdrv_attach_aio_context: 893 * 894 * May be called from .bdrv_attach_aio_context() to attach children to the new 895 * #AioContext. This is only needed by block drivers that manage their own 896 * children. Both ->file and ->backing are automatically handled and block 897 * drivers should not call this function on them explicitly. 898 */ 899 void bdrv_attach_aio_context(BlockDriverState *bs, 900 AioContext *new_context); 901 902 /** 903 * bdrv_add_aio_context_notifier: 904 * 905 * If a long-running job intends to be always run in the same AioContext as a 906 * certain BDS, it may use this function to be notified of changes regarding the 907 * association of the BDS to an AioContext. 908 * 909 * attached_aio_context() is called after the target BDS has been attached to a 910 * new AioContext; detach_aio_context() is called before the target BDS is being 911 * detached from its old AioContext. 912 */ 913 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 914 void (*attached_aio_context)(AioContext *new_context, void *opaque), 915 void (*detach_aio_context)(void *opaque), void *opaque); 916 917 /** 918 * bdrv_remove_aio_context_notifier: 919 * 920 * Unsubscribe of change notifications regarding the BDS's AioContext. The 921 * parameters given here have to be the same as those given to 922 * bdrv_add_aio_context_notifier(). 923 */ 924 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 925 void (*aio_context_attached)(AioContext *, 926 void *), 927 void (*aio_context_detached)(void *), 928 void *opaque); 929 930 /** 931 * bdrv_wakeup: 932 * @bs: The BlockDriverState for which an I/O operation has been completed. 933 * 934 * Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During 935 * synchronous I/O on a BlockDriverState that is attached to another 936 * I/O thread, the main thread lets the I/O thread's event loop run, 937 * waiting for the I/O operation to complete. A bdrv_wakeup will wake 938 * up the main thread if necessary. 939 * 940 * Manual calls to bdrv_wakeup are rarely necessary, because 941 * bdrv_dec_in_flight already calls it. 942 */ 943 void bdrv_wakeup(BlockDriverState *bs); 944 945 #ifdef _WIN32 946 int is_windows_drive(const char *filename); 947 #endif 948 949 /** 950 * stream_start: 951 * @job_id: The id of the newly-created job, or %NULL to use the 952 * device name of @bs. 953 * @bs: Block device to operate on. 954 * @base: Block device that will become the new base, or %NULL to 955 * flatten the whole backing file chain onto @bs. 956 * @backing_file_str: The file name that will be written to @bs as the 957 * the new backing file if the job completes. Ignored if @base is %NULL. 958 * @creation_flags: Flags that control the behavior of the Job lifetime. 959 * See @BlockJobCreateFlags 960 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 961 * @on_error: The action to take upon error. 962 * @errp: Error object. 963 * 964 * Start a streaming operation on @bs. Clusters that are unallocated 965 * in @bs, but allocated in any image between @base and @bs (both 966 * exclusive) will be written to @bs. At the end of a successful 967 * streaming job, the backing file of @bs will be changed to 968 * @backing_file_str in the written image and to @base in the live 969 * BlockDriverState. 970 */ 971 void stream_start(const char *job_id, BlockDriverState *bs, 972 BlockDriverState *base, const char *backing_file_str, 973 int creation_flags, int64_t speed, 974 BlockdevOnError on_error, Error **errp); 975 976 /** 977 * commit_start: 978 * @job_id: The id of the newly-created job, or %NULL to use the 979 * device name of @bs. 980 * @bs: Active block device. 981 * @top: Top block device to be committed. 982 * @base: Block device that will be written into, and become the new top. 983 * @creation_flags: Flags that control the behavior of the Job lifetime. 984 * See @BlockJobCreateFlags 985 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 986 * @on_error: The action to take upon error. 987 * @backing_file_str: String to use as the backing file in @top's overlay 988 * @filter_node_name: The node name that should be assigned to the filter 989 * driver that the commit job inserts into the graph above @top. NULL means 990 * that a node name should be autogenerated. 991 * @errp: Error object. 992 * 993 */ 994 void commit_start(const char *job_id, BlockDriverState *bs, 995 BlockDriverState *base, BlockDriverState *top, 996 int creation_flags, int64_t speed, 997 BlockdevOnError on_error, const char *backing_file_str, 998 const char *filter_node_name, Error **errp); 999 /** 1000 * commit_active_start: 1001 * @job_id: The id of the newly-created job, or %NULL to use the 1002 * device name of @bs. 1003 * @bs: Active block device to be committed. 1004 * @base: Block device that will be written into, and become the new top. 1005 * @creation_flags: Flags that control the behavior of the Job lifetime. 1006 * See @BlockJobCreateFlags 1007 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1008 * @on_error: The action to take upon error. 1009 * @filter_node_name: The node name that should be assigned to the filter 1010 * driver that the commit job inserts into the graph above @bs. NULL means that 1011 * a node name should be autogenerated. 1012 * @cb: Completion function for the job. 1013 * @opaque: Opaque pointer value passed to @cb. 1014 * @auto_complete: Auto complete the job. 1015 * @errp: Error object. 1016 * 1017 */ 1018 void commit_active_start(const char *job_id, BlockDriverState *bs, 1019 BlockDriverState *base, int creation_flags, 1020 int64_t speed, BlockdevOnError on_error, 1021 const char *filter_node_name, 1022 BlockCompletionFunc *cb, void *opaque, 1023 bool auto_complete, Error **errp); 1024 /* 1025 * mirror_start: 1026 * @job_id: The id of the newly-created job, or %NULL to use the 1027 * device name of @bs. 1028 * @bs: Block device to operate on. 1029 * @target: Block device to write to. 1030 * @replaces: Block graph node name to replace once the mirror is done. Can 1031 * only be used when full mirroring is selected. 1032 * @creation_flags: Flags that control the behavior of the Job lifetime. 1033 * See @BlockJobCreateFlags 1034 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1035 * @granularity: The chosen granularity for the dirty bitmap. 1036 * @buf_size: The amount of data that can be in flight at one time. 1037 * @mode: Whether to collapse all images in the chain to the target. 1038 * @backing_mode: How to establish the target's backing chain after completion. 1039 * @on_source_error: The action to take upon error reading from the source. 1040 * @on_target_error: The action to take upon error writing to the target. 1041 * @unmap: Whether to unmap target where source sectors only contain zeroes. 1042 * @filter_node_name: The node name that should be assigned to the filter 1043 * driver that the mirror job inserts into the graph above @bs. NULL means that 1044 * a node name should be autogenerated. 1045 * @copy_mode: When to trigger writes to the target. 1046 * @errp: Error object. 1047 * 1048 * Start a mirroring operation on @bs. Clusters that are allocated 1049 * in @bs will be written to @target until the job is cancelled or 1050 * manually completed. At the end of a successful mirroring job, 1051 * @bs will be switched to read from @target. 1052 */ 1053 void mirror_start(const char *job_id, BlockDriverState *bs, 1054 BlockDriverState *target, const char *replaces, 1055 int creation_flags, int64_t speed, 1056 uint32_t granularity, int64_t buf_size, 1057 MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1058 BlockdevOnError on_source_error, 1059 BlockdevOnError on_target_error, 1060 bool unmap, const char *filter_node_name, 1061 MirrorCopyMode copy_mode, Error **errp); 1062 1063 /* 1064 * backup_job_create: 1065 * @job_id: The id of the newly-created job, or %NULL to use the 1066 * device name of @bs. 1067 * @bs: Block device to operate on. 1068 * @target: Block device to write to. 1069 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1070 * @sync_mode: What parts of the disk image should be copied to the destination. 1071 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL. 1072 * @on_source_error: The action to take upon error reading from the source. 1073 * @on_target_error: The action to take upon error writing to the target. 1074 * @creation_flags: Flags that control the behavior of the Job lifetime. 1075 * See @BlockJobCreateFlags 1076 * @cb: Completion function for the job. 1077 * @opaque: Opaque pointer value passed to @cb. 1078 * @txn: Transaction that this job is part of (may be NULL). 1079 * 1080 * Create a backup operation on @bs. Clusters in @bs are written to @target 1081 * until the job is cancelled or manually completed. 1082 */ 1083 BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, 1084 BlockDriverState *target, int64_t speed, 1085 MirrorSyncMode sync_mode, 1086 BdrvDirtyBitmap *sync_bitmap, 1087 bool compress, 1088 BlockdevOnError on_source_error, 1089 BlockdevOnError on_target_error, 1090 int creation_flags, 1091 BlockCompletionFunc *cb, void *opaque, 1092 JobTxn *txn, Error **errp); 1093 1094 void hmp_drive_add_node(Monitor *mon, const char *optstr); 1095 1096 BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, 1097 const char *child_name, 1098 const BdrvChildRole *child_role, 1099 uint64_t perm, uint64_t shared_perm, 1100 void *opaque, Error **errp); 1101 void bdrv_root_unref_child(BdrvChild *child); 1102 1103 int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, 1104 Error **errp); 1105 1106 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by 1107 * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to 1108 * all children */ 1109 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, 1110 const BdrvChildRole *role, 1111 BlockReopenQueue *reopen_queue, 1112 uint64_t perm, uint64_t shared, 1113 uint64_t *nperm, uint64_t *nshared); 1114 1115 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by 1116 * (non-raw) image formats: Like above for bs->backing, but for bs->file it 1117 * requires WRITE | RESIZE for read-write images, always requires 1118 * CONSISTENT_READ and doesn't share WRITE. */ 1119 void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, 1120 const BdrvChildRole *role, 1121 BlockReopenQueue *reopen_queue, 1122 uint64_t perm, uint64_t shared, 1123 uint64_t *nperm, uint64_t *nshared); 1124 1125 /* 1126 * Default implementation for drivers to pass bdrv_co_block_status() to 1127 * their file. 1128 */ 1129 int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs, 1130 bool want_zero, 1131 int64_t offset, 1132 int64_t bytes, 1133 int64_t *pnum, 1134 int64_t *map, 1135 BlockDriverState **file); 1136 /* 1137 * Default implementation for drivers to pass bdrv_co_block_status() to 1138 * their backing file. 1139 */ 1140 int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs, 1141 bool want_zero, 1142 int64_t offset, 1143 int64_t bytes, 1144 int64_t *pnum, 1145 int64_t *map, 1146 BlockDriverState **file); 1147 const char *bdrv_get_parent_name(const BlockDriverState *bs); 1148 void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp); 1149 bool blk_dev_has_removable_media(BlockBackend *blk); 1150 bool blk_dev_has_tray(BlockBackend *blk); 1151 void blk_dev_eject_request(BlockBackend *blk, bool force); 1152 bool blk_dev_is_tray_open(BlockBackend *blk); 1153 bool blk_dev_is_medium_locked(BlockBackend *blk); 1154 1155 void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes); 1156 1157 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); 1158 void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup); 1159 1160 void bdrv_inc_in_flight(BlockDriverState *bs); 1161 void bdrv_dec_in_flight(BlockDriverState *bs); 1162 1163 void blockdev_close_all_bdrv_states(void); 1164 1165 int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset, 1166 BdrvChild *dst, uint64_t dst_offset, 1167 uint64_t bytes, 1168 BdrvRequestFlags read_flags, 1169 BdrvRequestFlags write_flags); 1170 int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset, 1171 BdrvChild *dst, uint64_t dst_offset, 1172 uint64_t bytes, 1173 BdrvRequestFlags read_flags, 1174 BdrvRequestFlags write_flags); 1175 1176 int refresh_total_sectors(BlockDriverState *bs, int64_t hint); 1177 1178 #endif /* BLOCK_INT_H */ 1179