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 Error **errp); 324 325 int coroutine_fn (*bdrv_save_vmstate)(BlockDriverState *bs, 326 QEMUIOVector *qiov, 327 int64_t pos); 328 int coroutine_fn (*bdrv_load_vmstate)(BlockDriverState *bs, 329 QEMUIOVector *qiov, 330 int64_t pos); 331 332 int (*bdrv_change_backing_file)(BlockDriverState *bs, 333 const char *backing_file, const char *backing_fmt); 334 335 /* removable device specific */ 336 bool (*bdrv_is_inserted)(BlockDriverState *bs); 337 void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag); 338 void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked); 339 340 /* to control generic scsi devices */ 341 BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, 342 unsigned long int req, void *buf, 343 BlockCompletionFunc *cb, void *opaque); 344 int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs, 345 unsigned long int req, void *buf); 346 347 /* List of options for creating images, terminated by name == NULL */ 348 QemuOptsList *create_opts; 349 350 /* 351 * Returns 0 for completed check, -errno for internal errors. 352 * The check results are stored in result. 353 */ 354 int coroutine_fn (*bdrv_co_check)(BlockDriverState *bs, 355 BdrvCheckResult *result, 356 BdrvCheckMode fix); 357 358 int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts, 359 BlockDriverAmendStatusCB *status_cb, 360 void *cb_opaque, 361 Error **errp); 362 363 void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event); 364 365 /* TODO Better pass a option string/QDict/QemuOpts to add any rule? */ 366 int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event, 367 const char *tag); 368 int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs, 369 const char *tag); 370 int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag); 371 bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag); 372 373 void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp); 374 375 /* 376 * Returns 1 if newly created images are guaranteed to contain only 377 * zeros, 0 otherwise. 378 */ 379 int (*bdrv_has_zero_init)(BlockDriverState *bs); 380 381 /* Remove fd handlers, timers, and other event loop callbacks so the event 382 * loop is no longer in use. Called with no in-flight requests and in 383 * depth-first traversal order with parents before child nodes. 384 */ 385 void (*bdrv_detach_aio_context)(BlockDriverState *bs); 386 387 /* Add fd handlers, timers, and other event loop callbacks so I/O requests 388 * can be processed again. Called with no in-flight requests and in 389 * depth-first traversal order with child nodes before parent nodes. 390 */ 391 void (*bdrv_attach_aio_context)(BlockDriverState *bs, 392 AioContext *new_context); 393 394 /* io queue for linux-aio */ 395 void (*bdrv_io_plug)(BlockDriverState *bs); 396 void (*bdrv_io_unplug)(BlockDriverState *bs); 397 398 /** 399 * Try to get @bs's logical and physical block size. 400 * On success, store them in @bsz and return zero. 401 * On failure, return negative errno. 402 */ 403 int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); 404 /** 405 * Try to get @bs's geometry (cyls, heads, sectors) 406 * On success, store them in @geo and return 0. 407 * On failure return -errno. 408 * Only drivers that want to override guest geometry implement this 409 * callback; see hd_geometry_guess(). 410 */ 411 int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); 412 413 /** 414 * bdrv_co_drain_begin is called if implemented in the beginning of a 415 * drain operation to drain and stop any internal sources of requests in 416 * the driver. 417 * bdrv_co_drain_end is called if implemented at the end of the drain. 418 * 419 * They should be used by the driver to e.g. manage scheduled I/O 420 * requests, or toggle an internal state. After the end of the drain new 421 * requests will continue normally. 422 */ 423 void coroutine_fn (*bdrv_co_drain_begin)(BlockDriverState *bs); 424 void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs); 425 426 void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child, 427 Error **errp); 428 void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child, 429 Error **errp); 430 431 /** 432 * Informs the block driver that a permission change is intended. The 433 * driver checks whether the change is permissible and may take other 434 * preparations for the change (e.g. get file system locks). This operation 435 * is always followed either by a call to either .bdrv_set_perm or 436 * .bdrv_abort_perm_update. 437 * 438 * Checks whether the requested set of cumulative permissions in @perm 439 * can be granted for accessing @bs and whether no other users are using 440 * permissions other than those given in @shared (both arguments take 441 * BLK_PERM_* bitmasks). 442 * 443 * If both conditions are met, 0 is returned. Otherwise, -errno is returned 444 * and errp is set to an error describing the conflict. 445 */ 446 int (*bdrv_check_perm)(BlockDriverState *bs, uint64_t perm, 447 uint64_t shared, Error **errp); 448 449 /** 450 * Called to inform the driver that the set of cumulative set of used 451 * permissions for @bs has changed to @perm, and the set of sharable 452 * permission to @shared. The driver can use this to propagate changes to 453 * its children (i.e. request permissions only if a parent actually needs 454 * them). 455 * 456 * This function is only invoked after bdrv_check_perm(), so block drivers 457 * may rely on preparations made in their .bdrv_check_perm implementation. 458 */ 459 void (*bdrv_set_perm)(BlockDriverState *bs, uint64_t perm, uint64_t shared); 460 461 /* 462 * Called to inform the driver that after a previous bdrv_check_perm() 463 * call, the permission update is not performed and any preparations made 464 * for it (e.g. taken file locks) need to be undone. 465 * 466 * This function can be called even for nodes that never saw a 467 * bdrv_check_perm() call. It is a no-op then. 468 */ 469 void (*bdrv_abort_perm_update)(BlockDriverState *bs); 470 471 /** 472 * Returns in @nperm and @nshared the permissions that the driver for @bs 473 * needs on its child @c, based on the cumulative permissions requested by 474 * the parents in @parent_perm and @parent_shared. 475 * 476 * If @c is NULL, return the permissions for attaching a new child for the 477 * given @role. 478 * 479 * If @reopen_queue is non-NULL, don't return the currently needed 480 * permissions, but those that will be needed after applying the 481 * @reopen_queue. 482 */ 483 void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c, 484 const BdrvChildRole *role, 485 BlockReopenQueue *reopen_queue, 486 uint64_t parent_perm, uint64_t parent_shared, 487 uint64_t *nperm, uint64_t *nshared); 488 489 /** 490 * Bitmaps should be marked as 'IN_USE' in the image on reopening image 491 * as rw. This handler should realize it. It also should unset readonly 492 * field of BlockDirtyBitmap's in case of success. 493 */ 494 int (*bdrv_reopen_bitmaps_rw)(BlockDriverState *bs, Error **errp); 495 bool (*bdrv_can_store_new_dirty_bitmap)(BlockDriverState *bs, 496 const char *name, 497 uint32_t granularity, 498 Error **errp); 499 void (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs, 500 const char *name, 501 Error **errp); 502 503 /** 504 * Register/unregister a buffer for I/O. For example, when the driver is 505 * interested to know the memory areas that will later be used in iovs, so 506 * that it can do IOMMU mapping with VFIO etc., in order to get better 507 * performance. In the case of VFIO drivers, this callback is used to do 508 * DMA mapping for hot buffers. 509 */ 510 void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size); 511 void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host); 512 QLIST_ENTRY(BlockDriver) list; 513 }; 514 515 typedef struct BlockLimits { 516 /* Alignment requirement, in bytes, for offset/length of I/O 517 * requests. Must be a power of 2 less than INT_MAX; defaults to 518 * 1 for drivers with modern byte interfaces, and to 512 519 * otherwise. */ 520 uint32_t request_alignment; 521 522 /* Maximum number of bytes that can be discarded at once (since it 523 * is signed, it must be < 2G, if set). Must be multiple of 524 * pdiscard_alignment, but need not be power of 2. May be 0 if no 525 * inherent 32-bit limit */ 526 int32_t max_pdiscard; 527 528 /* Optimal alignment for discard requests in bytes. A power of 2 529 * is best but not mandatory. Must be a multiple of 530 * bl.request_alignment, and must be less than max_pdiscard if 531 * that is set. May be 0 if bl.request_alignment is good enough */ 532 uint32_t pdiscard_alignment; 533 534 /* Maximum number of bytes that can zeroized at once (since it is 535 * signed, it must be < 2G, if set). Must be multiple of 536 * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */ 537 int32_t max_pwrite_zeroes; 538 539 /* Optimal alignment for write zeroes requests in bytes. A power 540 * of 2 is best but not mandatory. Must be a multiple of 541 * bl.request_alignment, and must be less than max_pwrite_zeroes 542 * if that is set. May be 0 if bl.request_alignment is good 543 * enough */ 544 uint32_t pwrite_zeroes_alignment; 545 546 /* Optimal transfer length in bytes. A power of 2 is best but not 547 * mandatory. Must be a multiple of bl.request_alignment, or 0 if 548 * no preferred size */ 549 uint32_t opt_transfer; 550 551 /* Maximal transfer length in bytes. Need not be power of 2, but 552 * must be multiple of opt_transfer and bl.request_alignment, or 0 553 * for no 32-bit limit. For now, anything larger than INT_MAX is 554 * clamped down. */ 555 uint32_t max_transfer; 556 557 /* memory alignment, in bytes so that no bounce buffer is needed */ 558 size_t min_mem_alignment; 559 560 /* memory alignment, in bytes, for bounce buffer */ 561 size_t opt_mem_alignment; 562 563 /* maximum number of iovec elements */ 564 int max_iov; 565 } BlockLimits; 566 567 typedef struct BdrvOpBlocker BdrvOpBlocker; 568 569 typedef struct BdrvAioNotifier { 570 void (*attached_aio_context)(AioContext *new_context, void *opaque); 571 void (*detach_aio_context)(void *opaque); 572 573 void *opaque; 574 bool deleted; 575 576 QLIST_ENTRY(BdrvAioNotifier) list; 577 } BdrvAioNotifier; 578 579 struct BdrvChildRole { 580 /* If true, bdrv_replace_node() doesn't change the node this BdrvChild 581 * points to. */ 582 bool stay_at_node; 583 584 /* If true, the parent is a BlockDriverState and bdrv_next_all_states() 585 * will return it. This information is used for drain_all, where every node 586 * will be drained separately, so the drain only needs to be propagated to 587 * non-BDS parents. */ 588 bool parent_is_bds; 589 590 void (*inherit_options)(int *child_flags, QDict *child_options, 591 int parent_flags, QDict *parent_options); 592 593 void (*change_media)(BdrvChild *child, bool load); 594 void (*resize)(BdrvChild *child); 595 596 /* Returns a name that is supposedly more useful for human users than the 597 * node name for identifying the node in question (in particular, a BB 598 * name), or NULL if the parent can't provide a better name. */ 599 const char *(*get_name)(BdrvChild *child); 600 601 /* Returns a malloced string that describes the parent of the child for a 602 * human reader. This could be a node-name, BlockBackend name, qdev ID or 603 * QOM path of the device owning the BlockBackend, job type and ID etc. The 604 * caller is responsible for freeing the memory. */ 605 char *(*get_parent_desc)(BdrvChild *child); 606 607 /* 608 * If this pair of functions is implemented, the parent doesn't issue new 609 * requests after returning from .drained_begin() until .drained_end() is 610 * called. 611 * 612 * These functions must not change the graph (and therefore also must not 613 * call aio_poll(), which could change the graph indirectly). 614 * 615 * Note that this can be nested. If drained_begin() was called twice, new 616 * I/O is allowed only after drained_end() was called twice, too. 617 */ 618 void (*drained_begin)(BdrvChild *child); 619 void (*drained_end)(BdrvChild *child); 620 621 /* 622 * Returns whether the parent has pending requests for the child. This 623 * callback is polled after .drained_begin() has been called until all 624 * activity on the child has stopped. 625 */ 626 bool (*drained_poll)(BdrvChild *child); 627 628 /* Notifies the parent that the child has been activated/inactivated (e.g. 629 * when migration is completing) and it can start/stop requesting 630 * permissions and doing I/O on it. */ 631 void (*activate)(BdrvChild *child, Error **errp); 632 int (*inactivate)(BdrvChild *child); 633 634 void (*attach)(BdrvChild *child); 635 void (*detach)(BdrvChild *child); 636 637 /* Notifies the parent that the filename of its child has changed (e.g. 638 * because the direct child was removed from the backing chain), so that it 639 * can update its reference. */ 640 int (*update_filename)(BdrvChild *child, BlockDriverState *new_base, 641 const char *filename, Error **errp); 642 }; 643 644 extern const BdrvChildRole child_file; 645 extern const BdrvChildRole child_format; 646 extern const BdrvChildRole child_backing; 647 648 struct BdrvChild { 649 BlockDriverState *bs; 650 char *name; 651 const BdrvChildRole *role; 652 void *opaque; 653 654 /** 655 * Granted permissions for operating on this BdrvChild (BLK_PERM_* bitmask) 656 */ 657 uint64_t perm; 658 659 /** 660 * Permissions that can still be granted to other users of @bs while this 661 * BdrvChild is still attached to it. (BLK_PERM_* bitmask) 662 */ 663 uint64_t shared_perm; 664 665 QLIST_ENTRY(BdrvChild) next; 666 QLIST_ENTRY(BdrvChild) next_parent; 667 }; 668 669 /* 670 * Note: the function bdrv_append() copies and swaps contents of 671 * BlockDriverStates, so if you add new fields to this struct, please 672 * inspect bdrv_append() to determine if the new fields need to be 673 * copied as well. 674 */ 675 struct BlockDriverState { 676 /* Protected by big QEMU lock or read-only after opening. No special 677 * locking needed during I/O... 678 */ 679 int open_flags; /* flags used to open the file, re-used for re-open */ 680 bool read_only; /* if true, the media is read only */ 681 bool encrypted; /* if true, the media is encrypted */ 682 bool sg; /* if true, the device is a /dev/sg* */ 683 bool probed; /* if true, format was probed rather than specified */ 684 bool force_share; /* if true, always allow all shared permissions */ 685 bool implicit; /* if true, this filter node was automatically inserted */ 686 687 BlockDriver *drv; /* NULL means no media */ 688 void *opaque; 689 690 AioContext *aio_context; /* event loop used for fd handlers, timers, etc */ 691 /* long-running tasks intended to always use the same AioContext as this 692 * BDS may register themselves in this list to be notified of changes 693 * regarding this BDS's context */ 694 QLIST_HEAD(, BdrvAioNotifier) aio_notifiers; 695 bool walking_aio_notifiers; /* to make removal during iteration safe */ 696 697 char filename[PATH_MAX]; 698 char backing_file[PATH_MAX]; /* if non zero, the image is a diff of 699 this file image */ 700 char backing_format[16]; /* if non-zero and backing_file exists */ 701 702 QDict *full_open_options; 703 char exact_filename[PATH_MAX]; 704 705 BdrvChild *backing; 706 BdrvChild *file; 707 708 /* I/O Limits */ 709 BlockLimits bl; 710 711 /* Flags honored during pwrite (so far: BDRV_REQ_FUA, 712 * BDRV_REQ_WRITE_UNCHANGED). 713 * If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those 714 * writes will be issued as normal writes without the flag set. 715 * This is important to note for drivers that do not explicitly 716 * request a WRITE permission for their children and instead take 717 * the same permissions as their parent did (this is commonly what 718 * block filters do). Such drivers have to be aware that the 719 * parent may have taken a WRITE_UNCHANGED permission only and is 720 * issuing such requests. Drivers either must make sure that 721 * these requests do not result in plain WRITE accesses (usually 722 * by supporting BDRV_REQ_WRITE_UNCHANGED, and then forwarding 723 * every incoming write request as-is, including potentially that 724 * flag), or they have to explicitly take the WRITE permission for 725 * their children. */ 726 unsigned int supported_write_flags; 727 /* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA, 728 * BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */ 729 unsigned int supported_zero_flags; 730 731 /* the following member gives a name to every node on the bs graph. */ 732 char node_name[32]; 733 /* element of the list of named nodes building the graph */ 734 QTAILQ_ENTRY(BlockDriverState) node_list; 735 /* element of the list of all BlockDriverStates (all_bdrv_states) */ 736 QTAILQ_ENTRY(BlockDriverState) bs_list; 737 /* element of the list of monitor-owned BDS */ 738 QTAILQ_ENTRY(BlockDriverState) monitor_list; 739 int refcnt; 740 741 /* operation blockers */ 742 QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX]; 743 744 /* long-running background operation */ 745 BlockJob *job; 746 747 /* The node that this node inherited default options from (and a reopen on 748 * which can affect this node by changing these defaults). This is always a 749 * parent node of this node. */ 750 BlockDriverState *inherits_from; 751 QLIST_HEAD(, BdrvChild) children; 752 QLIST_HEAD(, BdrvChild) parents; 753 754 QDict *options; 755 QDict *explicit_options; 756 BlockdevDetectZeroesOptions detect_zeroes; 757 758 /* The error object in use for blocking operations on backing_hd */ 759 Error *backing_blocker; 760 761 /* Protected by AioContext lock */ 762 763 /* If we are reading a disk image, give its size in sectors. 764 * Generally read-only; it is written to by load_snapshot and 765 * save_snaphost, but the block layer is quiescent during those. 766 */ 767 int64_t total_sectors; 768 769 /* Callback before write request is processed */ 770 NotifierWithReturnList before_write_notifiers; 771 772 /* threshold limit for writes, in bytes. "High water mark". */ 773 uint64_t write_threshold_offset; 774 NotifierWithReturn write_threshold_notifier; 775 776 /* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex. 777 * Reading from the list can be done with either the BQL or the 778 * dirty_bitmap_mutex. Modifying a bitmap only requires 779 * dirty_bitmap_mutex. */ 780 QemuMutex dirty_bitmap_mutex; 781 QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps; 782 783 /* Offset after the highest byte written to */ 784 Stat64 wr_highest_offset; 785 786 /* If true, copy read backing sectors into image. Can be >1 if more 787 * than one client has requested copy-on-read. Accessed with atomic 788 * ops. 789 */ 790 int copy_on_read; 791 792 /* number of in-flight requests; overall and serialising. 793 * Accessed with atomic ops. 794 */ 795 unsigned int in_flight; 796 unsigned int serialising_in_flight; 797 798 /* counter for nested bdrv_io_plug. 799 * Accessed with atomic ops. 800 */ 801 unsigned io_plugged; 802 803 /* do we need to tell the quest if we have a volatile write cache? */ 804 int enable_write_cache; 805 806 /* Accessed with atomic ops. */ 807 int quiesce_counter; 808 int recursive_quiesce_counter; 809 810 unsigned int write_gen; /* Current data generation */ 811 812 /* Protected by reqs_lock. */ 813 CoMutex reqs_lock; 814 QLIST_HEAD(, BdrvTrackedRequest) tracked_requests; 815 CoQueue flush_queue; /* Serializing flush queue */ 816 bool active_flush_req; /* Flush request in flight? */ 817 818 /* Only read/written by whoever has set active_flush_req to true. */ 819 unsigned int flushed_gen; /* Flushed write generation */ 820 }; 821 822 struct BlockBackendRootState { 823 int open_flags; 824 bool read_only; 825 BlockdevDetectZeroesOptions detect_zeroes; 826 }; 827 828 typedef enum BlockMirrorBackingMode { 829 /* Reuse the existing backing chain from the source for the target. 830 * - sync=full: Set backing BDS to NULL. 831 * - sync=top: Use source's backing BDS. 832 * - sync=none: Use source as the backing BDS. */ 833 MIRROR_SOURCE_BACKING_CHAIN, 834 835 /* Open the target's backing chain completely anew */ 836 MIRROR_OPEN_BACKING_CHAIN, 837 838 /* Do not change the target's backing BDS after job completion */ 839 MIRROR_LEAVE_BACKING_CHAIN, 840 } BlockMirrorBackingMode; 841 842 static inline BlockDriverState *backing_bs(BlockDriverState *bs) 843 { 844 return bs->backing ? bs->backing->bs : NULL; 845 } 846 847 848 /* Essential block drivers which must always be statically linked into qemu, and 849 * which therefore can be accessed without using bdrv_find_format() */ 850 extern BlockDriver bdrv_file; 851 extern BlockDriver bdrv_raw; 852 extern BlockDriver bdrv_qcow2; 853 854 int coroutine_fn bdrv_co_preadv(BdrvChild *child, 855 int64_t offset, unsigned int bytes, QEMUIOVector *qiov, 856 BdrvRequestFlags flags); 857 int coroutine_fn bdrv_co_pwritev(BdrvChild *child, 858 int64_t offset, unsigned int bytes, QEMUIOVector *qiov, 859 BdrvRequestFlags flags); 860 861 extern unsigned int bdrv_drain_all_count; 862 void bdrv_apply_subtree_drain(BdrvChild *child, BlockDriverState *new_parent); 863 void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent); 864 865 int get_tmp_filename(char *filename, int size); 866 BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size, 867 const char *filename); 868 869 void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix, 870 QDict *options); 871 872 873 /** 874 * bdrv_add_before_write_notifier: 875 * 876 * Register a callback that is invoked before write requests are processed but 877 * after any throttling or waiting for overlapping requests. 878 */ 879 void bdrv_add_before_write_notifier(BlockDriverState *bs, 880 NotifierWithReturn *notifier); 881 882 /** 883 * bdrv_detach_aio_context: 884 * 885 * May be called from .bdrv_detach_aio_context() to detach children from the 886 * current #AioContext. This is only needed by block drivers that manage their 887 * own children. Both ->file and ->backing are automatically handled and 888 * block drivers should not call this function on them explicitly. 889 */ 890 void bdrv_detach_aio_context(BlockDriverState *bs); 891 892 /** 893 * bdrv_attach_aio_context: 894 * 895 * May be called from .bdrv_attach_aio_context() to attach children to the new 896 * #AioContext. This is only needed by block drivers that manage their own 897 * children. Both ->file and ->backing are automatically handled and block 898 * drivers should not call this function on them explicitly. 899 */ 900 void bdrv_attach_aio_context(BlockDriverState *bs, 901 AioContext *new_context); 902 903 /** 904 * bdrv_add_aio_context_notifier: 905 * 906 * If a long-running job intends to be always run in the same AioContext as a 907 * certain BDS, it may use this function to be notified of changes regarding the 908 * association of the BDS to an AioContext. 909 * 910 * attached_aio_context() is called after the target BDS has been attached to a 911 * new AioContext; detach_aio_context() is called before the target BDS is being 912 * detached from its old AioContext. 913 */ 914 void bdrv_add_aio_context_notifier(BlockDriverState *bs, 915 void (*attached_aio_context)(AioContext *new_context, void *opaque), 916 void (*detach_aio_context)(void *opaque), void *opaque); 917 918 /** 919 * bdrv_remove_aio_context_notifier: 920 * 921 * Unsubscribe of change notifications regarding the BDS's AioContext. The 922 * parameters given here have to be the same as those given to 923 * bdrv_add_aio_context_notifier(). 924 */ 925 void bdrv_remove_aio_context_notifier(BlockDriverState *bs, 926 void (*aio_context_attached)(AioContext *, 927 void *), 928 void (*aio_context_detached)(void *), 929 void *opaque); 930 931 /** 932 * bdrv_wakeup: 933 * @bs: The BlockDriverState for which an I/O operation has been completed. 934 * 935 * Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During 936 * synchronous I/O on a BlockDriverState that is attached to another 937 * I/O thread, the main thread lets the I/O thread's event loop run, 938 * waiting for the I/O operation to complete. A bdrv_wakeup will wake 939 * up the main thread if necessary. 940 * 941 * Manual calls to bdrv_wakeup are rarely necessary, because 942 * bdrv_dec_in_flight already calls it. 943 */ 944 void bdrv_wakeup(BlockDriverState *bs); 945 946 #ifdef _WIN32 947 int is_windows_drive(const char *filename); 948 #endif 949 950 /** 951 * stream_start: 952 * @job_id: The id of the newly-created job, or %NULL to use the 953 * device name of @bs. 954 * @bs: Block device to operate on. 955 * @base: Block device that will become the new base, or %NULL to 956 * flatten the whole backing file chain onto @bs. 957 * @backing_file_str: The file name that will be written to @bs as the 958 * the new backing file if the job completes. Ignored if @base is %NULL. 959 * @creation_flags: Flags that control the behavior of the Job lifetime. 960 * See @BlockJobCreateFlags 961 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 962 * @on_error: The action to take upon error. 963 * @errp: Error object. 964 * 965 * Start a streaming operation on @bs. Clusters that are unallocated 966 * in @bs, but allocated in any image between @base and @bs (both 967 * exclusive) will be written to @bs. At the end of a successful 968 * streaming job, the backing file of @bs will be changed to 969 * @backing_file_str in the written image and to @base in the live 970 * BlockDriverState. 971 */ 972 void stream_start(const char *job_id, BlockDriverState *bs, 973 BlockDriverState *base, const char *backing_file_str, 974 int creation_flags, int64_t speed, 975 BlockdevOnError on_error, Error **errp); 976 977 /** 978 * commit_start: 979 * @job_id: The id of the newly-created job, or %NULL to use the 980 * device name of @bs. 981 * @bs: Active block device. 982 * @top: Top block device to be committed. 983 * @base: Block device that will be written into, and become the new top. 984 * @creation_flags: Flags that control the behavior of the Job lifetime. 985 * See @BlockJobCreateFlags 986 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 987 * @on_error: The action to take upon error. 988 * @backing_file_str: String to use as the backing file in @top's overlay 989 * @filter_node_name: The node name that should be assigned to the filter 990 * driver that the commit job inserts into the graph above @top. NULL means 991 * that a node name should be autogenerated. 992 * @errp: Error object. 993 * 994 */ 995 void commit_start(const char *job_id, BlockDriverState *bs, 996 BlockDriverState *base, BlockDriverState *top, 997 int creation_flags, int64_t speed, 998 BlockdevOnError on_error, const char *backing_file_str, 999 const char *filter_node_name, Error **errp); 1000 /** 1001 * commit_active_start: 1002 * @job_id: The id of the newly-created job, or %NULL to use the 1003 * device name of @bs. 1004 * @bs: Active block device to be committed. 1005 * @base: Block device that will be written into, and become the new top. 1006 * @creation_flags: Flags that control the behavior of the Job lifetime. 1007 * See @BlockJobCreateFlags 1008 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1009 * @on_error: The action to take upon error. 1010 * @filter_node_name: The node name that should be assigned to the filter 1011 * driver that the commit job inserts into the graph above @bs. NULL means that 1012 * a node name should be autogenerated. 1013 * @cb: Completion function for the job. 1014 * @opaque: Opaque pointer value passed to @cb. 1015 * @auto_complete: Auto complete the job. 1016 * @errp: Error object. 1017 * 1018 */ 1019 void commit_active_start(const char *job_id, BlockDriverState *bs, 1020 BlockDriverState *base, int creation_flags, 1021 int64_t speed, BlockdevOnError on_error, 1022 const char *filter_node_name, 1023 BlockCompletionFunc *cb, void *opaque, 1024 bool auto_complete, Error **errp); 1025 /* 1026 * mirror_start: 1027 * @job_id: The id of the newly-created job, or %NULL to use the 1028 * device name of @bs. 1029 * @bs: Block device to operate on. 1030 * @target: Block device to write to. 1031 * @replaces: Block graph node name to replace once the mirror is done. Can 1032 * only be used when full mirroring is selected. 1033 * @creation_flags: Flags that control the behavior of the Job lifetime. 1034 * See @BlockJobCreateFlags 1035 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1036 * @granularity: The chosen granularity for the dirty bitmap. 1037 * @buf_size: The amount of data that can be in flight at one time. 1038 * @mode: Whether to collapse all images in the chain to the target. 1039 * @backing_mode: How to establish the target's backing chain after completion. 1040 * @on_source_error: The action to take upon error reading from the source. 1041 * @on_target_error: The action to take upon error writing to the target. 1042 * @unmap: Whether to unmap target where source sectors only contain zeroes. 1043 * @filter_node_name: The node name that should be assigned to the filter 1044 * driver that the mirror job inserts into the graph above @bs. NULL means that 1045 * a node name should be autogenerated. 1046 * @copy_mode: When to trigger writes to the target. 1047 * @errp: Error object. 1048 * 1049 * Start a mirroring operation on @bs. Clusters that are allocated 1050 * in @bs will be written to @target until the job is cancelled or 1051 * manually completed. At the end of a successful mirroring job, 1052 * @bs will be switched to read from @target. 1053 */ 1054 void mirror_start(const char *job_id, BlockDriverState *bs, 1055 BlockDriverState *target, const char *replaces, 1056 int creation_flags, int64_t speed, 1057 uint32_t granularity, int64_t buf_size, 1058 MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, 1059 BlockdevOnError on_source_error, 1060 BlockdevOnError on_target_error, 1061 bool unmap, const char *filter_node_name, 1062 MirrorCopyMode copy_mode, Error **errp); 1063 1064 /* 1065 * backup_job_create: 1066 * @job_id: The id of the newly-created job, or %NULL to use the 1067 * device name of @bs. 1068 * @bs: Block device to operate on. 1069 * @target: Block device to write to. 1070 * @speed: The maximum speed, in bytes per second, or 0 for unlimited. 1071 * @sync_mode: What parts of the disk image should be copied to the destination. 1072 * @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL. 1073 * @on_source_error: The action to take upon error reading from the source. 1074 * @on_target_error: The action to take upon error writing to the target. 1075 * @creation_flags: Flags that control the behavior of the Job lifetime. 1076 * See @BlockJobCreateFlags 1077 * @cb: Completion function for the job. 1078 * @opaque: Opaque pointer value passed to @cb. 1079 * @txn: Transaction that this job is part of (may be NULL). 1080 * 1081 * Create a backup operation on @bs. Clusters in @bs are written to @target 1082 * until the job is cancelled or manually completed. 1083 */ 1084 BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, 1085 BlockDriverState *target, int64_t speed, 1086 MirrorSyncMode sync_mode, 1087 BdrvDirtyBitmap *sync_bitmap, 1088 bool compress, 1089 BlockdevOnError on_source_error, 1090 BlockdevOnError on_target_error, 1091 int creation_flags, 1092 BlockCompletionFunc *cb, void *opaque, 1093 JobTxn *txn, Error **errp); 1094 1095 void hmp_drive_add_node(Monitor *mon, const char *optstr); 1096 1097 BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs, 1098 const char *child_name, 1099 const BdrvChildRole *child_role, 1100 uint64_t perm, uint64_t shared_perm, 1101 void *opaque, Error **errp); 1102 void bdrv_root_unref_child(BdrvChild *child); 1103 1104 int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared, 1105 Error **errp); 1106 1107 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by 1108 * block filters: Forward CONSISTENT_READ, WRITE, WRITE_UNCHANGED and RESIZE to 1109 * all children */ 1110 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c, 1111 const BdrvChildRole *role, 1112 BlockReopenQueue *reopen_queue, 1113 uint64_t perm, uint64_t shared, 1114 uint64_t *nperm, uint64_t *nshared); 1115 1116 /* Default implementation for BlockDriver.bdrv_child_perm() that can be used by 1117 * (non-raw) image formats: Like above for bs->backing, but for bs->file it 1118 * requires WRITE | RESIZE for read-write images, always requires 1119 * CONSISTENT_READ and doesn't share WRITE. */ 1120 void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c, 1121 const BdrvChildRole *role, 1122 BlockReopenQueue *reopen_queue, 1123 uint64_t perm, uint64_t shared, 1124 uint64_t *nperm, uint64_t *nshared); 1125 1126 /* 1127 * Default implementation for drivers to pass bdrv_co_block_status() to 1128 * their file. 1129 */ 1130 int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs, 1131 bool want_zero, 1132 int64_t offset, 1133 int64_t bytes, 1134 int64_t *pnum, 1135 int64_t *map, 1136 BlockDriverState **file); 1137 /* 1138 * Default implementation for drivers to pass bdrv_co_block_status() to 1139 * their backing file. 1140 */ 1141 int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs, 1142 bool want_zero, 1143 int64_t offset, 1144 int64_t bytes, 1145 int64_t *pnum, 1146 int64_t *map, 1147 BlockDriverState **file); 1148 const char *bdrv_get_parent_name(const BlockDriverState *bs); 1149 void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp); 1150 bool blk_dev_has_removable_media(BlockBackend *blk); 1151 bool blk_dev_has_tray(BlockBackend *blk); 1152 void blk_dev_eject_request(BlockBackend *blk, bool force); 1153 bool blk_dev_is_tray_open(BlockBackend *blk); 1154 bool blk_dev_is_medium_locked(BlockBackend *blk); 1155 1156 void bdrv_set_dirty(BlockDriverState *bs, int64_t offset, int64_t bytes); 1157 1158 void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out); 1159 void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup); 1160 1161 void bdrv_inc_in_flight(BlockDriverState *bs); 1162 void bdrv_dec_in_flight(BlockDriverState *bs); 1163 1164 void blockdev_close_all_bdrv_states(void); 1165 1166 int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset, 1167 BdrvChild *dst, uint64_t dst_offset, 1168 uint64_t bytes, 1169 BdrvRequestFlags read_flags, 1170 BdrvRequestFlags write_flags); 1171 int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset, 1172 BdrvChild *dst, uint64_t dst_offset, 1173 uint64_t bytes, 1174 BdrvRequestFlags read_flags, 1175 BdrvRequestFlags write_flags); 1176 1177 int refresh_total_sectors(BlockDriverState *bs, int64_t hint); 1178 1179 #endif /* BLOCK_INT_H */ 1180