1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef BLK_INTERNAL_H 3 #define BLK_INTERNAL_H 4 5 #include <linux/bio-integrity.h> 6 #include <linux/blk-crypto.h> 7 #include <linux/lockdep.h> 8 #include <linux/memblock.h> /* for max_pfn/max_low_pfn */ 9 #include <linux/sched/sysctl.h> 10 #include <linux/timekeeping.h> 11 #include <xen/xen.h> 12 #include "blk-crypto-internal.h" 13 14 struct elv_change_ctx; 15 16 /* 17 * Default upper limit for the software max_sectors limit used for regular I/Os. 18 * This can be increased through sysfs. 19 * 20 * This should not be confused with the max_hw_sector limit that is entirely 21 * controlled by the block device driver, usually based on hardware limits. 22 */ 23 #define BLK_DEF_MAX_SECTORS_CAP (SZ_4M >> SECTOR_SHIFT) 24 25 #define BLK_DEV_MAX_SECTORS (LLONG_MAX >> 9) 26 #define BLK_MIN_SEGMENT_SIZE 4096 27 28 /* Max future timer expiry for timeouts */ 29 #define BLK_MAX_TIMEOUT (5 * HZ) 30 31 extern const struct kobj_type blk_queue_ktype; 32 extern struct dentry *blk_debugfs_root; 33 34 struct blk_flush_queue { 35 spinlock_t mq_flush_lock; 36 unsigned int flush_pending_idx:1; 37 unsigned int flush_running_idx:1; 38 blk_status_t rq_status; 39 unsigned long flush_pending_since; 40 struct list_head flush_queue[2]; 41 unsigned long flush_data_in_flight; 42 struct request *flush_rq; 43 struct rcu_head rcu_head; 44 }; 45 46 bool is_flush_rq(struct request *req); 47 48 struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size, 49 gfp_t flags); 50 void blk_free_flush_queue(struct blk_flush_queue *q); 51 52 const char *blk_status_to_str(blk_status_t status); 53 54 bool __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic); 55 bool blk_queue_start_drain(struct request_queue *q); 56 bool __blk_freeze_queue_start(struct request_queue *q, 57 struct task_struct *owner); 58 int __bio_queue_enter(struct request_queue *q, struct bio *bio); 59 void submit_bio_noacct_nocheck(struct bio *bio, bool split); 60 int bio_submit_or_kill(struct bio *bio, unsigned int flags); 61 62 static inline bool blk_try_enter_queue(struct request_queue *q, bool pm) 63 { 64 rcu_read_lock(); 65 if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter)) 66 goto fail; 67 68 /* 69 * The code that increments the pm_only counter must ensure that the 70 * counter is globally visible before the queue is unfrozen. 71 */ 72 if (blk_queue_pm_only(q) && 73 (!pm || queue_rpm_status(q) == RPM_SUSPENDED)) 74 goto fail_put; 75 76 rcu_read_unlock(); 77 return true; 78 79 fail_put: 80 blk_queue_exit(q); 81 fail: 82 rcu_read_unlock(); 83 return false; 84 } 85 86 static inline int bio_queue_enter(struct bio *bio) 87 { 88 struct request_queue *q = bdev_get_queue(bio->bi_bdev); 89 90 if (blk_try_enter_queue(q, false)) { 91 rwsem_acquire_read(&q->io_lockdep_map, 0, 0, _RET_IP_); 92 rwsem_release(&q->io_lockdep_map, _RET_IP_); 93 return 0; 94 } 95 return __bio_queue_enter(q, bio); 96 } 97 98 static inline void blk_wait_io(struct completion *done) 99 { 100 /* Prevent hang_check timer from firing at us during very long I/O */ 101 unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2; 102 103 if (timeout) 104 while (!wait_for_completion_io_timeout(done, timeout)) 105 ; 106 else 107 wait_for_completion_io(done); 108 } 109 110 struct block_device *blkdev_get_no_open(dev_t dev, bool autoload); 111 void blkdev_put_no_open(struct block_device *bdev); 112 113 bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv, 114 struct page *page, unsigned len, unsigned offset); 115 116 static inline bool biovec_phys_mergeable(struct request_queue *q, 117 struct bio_vec *vec1, struct bio_vec *vec2) 118 { 119 unsigned long mask = queue_segment_boundary(q); 120 phys_addr_t addr1 = bvec_phys(vec1); 121 phys_addr_t addr2 = bvec_phys(vec2); 122 123 /* 124 * Merging adjacent physical pages may not work correctly under KMSAN 125 * if their metadata pages aren't adjacent. Just disable merging. 126 */ 127 if (IS_ENABLED(CONFIG_KMSAN)) 128 return false; 129 130 if (addr1 + vec1->bv_len != addr2) 131 return false; 132 if (!zone_device_pages_have_same_pgmap(vec1->bv_page, vec2->bv_page)) 133 return false; 134 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) 135 return false; 136 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) 137 return false; 138 return true; 139 } 140 141 /* 142 * Check if two pages from potentially different zone device pgmaps can 143 * coexist as separate bvec entries in the same bio. 144 * 145 * The block DMA iterator (blk_dma_map_iter_start) caches the P2PDMA mapping 146 * state from the first segment and applies it to all subsequent segments, so 147 * P2PDMA pages from different pgmaps must not be mixed in the same bio. 148 * 149 * Other zone device types (FS_DAX, GENERIC) use the same dma_map_phys() path 150 * as normal RAM. PRIVATE and COHERENT pages never appear in bios. 151 */ 152 static inline bool zone_device_pages_compatible(const struct page *a, 153 const struct page *b) 154 { 155 if (is_pci_p2pdma_page(a) || is_pci_p2pdma_page(b)) 156 return zone_device_pages_have_same_pgmap(a, b); 157 return true; 158 } 159 160 static inline bool __bvec_gap_to_prev(const struct queue_limits *lim, 161 struct bio_vec *bprv, unsigned int offset) 162 { 163 return (offset & lim->virt_boundary_mask) || 164 ((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask); 165 } 166 167 /* 168 * Check if adding a bio_vec after bprv with offset would create a gap in 169 * the SG list. Most drivers don't care about this, but some do. 170 */ 171 static inline bool bvec_gap_to_prev(const struct queue_limits *lim, 172 struct bio_vec *bprv, unsigned int offset) 173 { 174 if (!lim->virt_boundary_mask) 175 return false; 176 return __bvec_gap_to_prev(lim, bprv, offset); 177 } 178 179 static inline bool rq_mergeable(struct request *rq) 180 { 181 if (blk_rq_is_passthrough(rq)) 182 return false; 183 184 if (req_op(rq) == REQ_OP_FLUSH) 185 return false; 186 187 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 188 return false; 189 190 if (req_op(rq) == REQ_OP_ZONE_APPEND) 191 return false; 192 193 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 194 return false; 195 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 196 return false; 197 198 return true; 199 } 200 201 /* 202 * There are two different ways to handle DISCARD merges: 203 * 1) If max_discard_segments > 1, the driver treats every bio as a range and 204 * send the bios to controller together. The ranges don't need to be 205 * contiguous. 206 * 2) Otherwise, the request will be normal read/write requests. The ranges 207 * need to be contiguous. 208 */ 209 static inline bool blk_discard_mergable(struct request *req) 210 { 211 if (req_op(req) == REQ_OP_DISCARD && 212 queue_max_discard_segments(req->q) > 1) 213 return true; 214 return false; 215 } 216 217 static inline unsigned int blk_rq_get_max_segments(struct request *rq) 218 { 219 if (req_op(rq) == REQ_OP_DISCARD) 220 return queue_max_discard_segments(rq->q); 221 return queue_max_segments(rq->q); 222 } 223 224 static inline unsigned int blk_queue_get_max_sectors(struct request *rq) 225 { 226 struct request_queue *q = rq->q; 227 enum req_op op = req_op(rq); 228 229 if (unlikely(op == REQ_OP_DISCARD)) 230 return min(q->limits.max_discard_sectors, 231 UINT_MAX >> SECTOR_SHIFT); 232 233 if (unlikely(op == REQ_OP_SECURE_ERASE)) 234 return min(q->limits.max_secure_erase_sectors, 235 UINT_MAX >> SECTOR_SHIFT); 236 237 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 238 return q->limits.max_write_zeroes_sectors; 239 240 if (rq->cmd_flags & REQ_ATOMIC) 241 return q->limits.atomic_write_max_sectors; 242 243 return q->limits.max_sectors; 244 } 245 246 #ifdef CONFIG_BLK_DEV_INTEGRITY 247 void blk_flush_integrity(void); 248 void bio_integrity_free(struct bio *bio); 249 250 /* 251 * Integrity payloads can either be owned by the submitter, in which case 252 * bio_uninit will free them, or owned and generated by the block layer, 253 * in which case we'll verify them here (for reads) and free them before 254 * the bio is handed back to the submitted. 255 */ 256 bool __bio_integrity_endio(struct bio *bio); 257 static inline bool bio_integrity_endio(struct bio *bio) 258 { 259 struct bio_integrity_payload *bip = bio_integrity(bio); 260 261 if (bip && (bip->bip_flags & BIP_BLOCK_INTEGRITY)) 262 return __bio_integrity_endio(bio); 263 return true; 264 } 265 266 bool blk_integrity_merge_rq(struct request_queue *, struct request *, 267 struct request *); 268 bool blk_integrity_merge_bio(struct request_queue *, struct request *, 269 struct bio *); 270 271 static inline bool integrity_req_gap_back_merge(struct request *req, 272 struct bio *next) 273 { 274 struct bio_integrity_payload *bip = bio_integrity(req->bio); 275 struct bio_integrity_payload *bip_next = bio_integrity(next); 276 277 return bvec_gap_to_prev(&req->q->limits, 278 &bip->bip_vec[bip->bip_vcnt - 1], 279 bip_next->bip_vec[0].bv_offset); 280 } 281 282 static inline bool integrity_req_gap_front_merge(struct request *req, 283 struct bio *bio) 284 { 285 struct bio_integrity_payload *bip = bio_integrity(bio); 286 struct bio_integrity_payload *bip_next = bio_integrity(req->bio); 287 288 return bvec_gap_to_prev(&req->q->limits, 289 &bip->bip_vec[bip->bip_vcnt - 1], 290 bip_next->bip_vec[0].bv_offset); 291 } 292 293 extern const struct attribute_group blk_integrity_attr_group; 294 #else /* CONFIG_BLK_DEV_INTEGRITY */ 295 static inline bool blk_integrity_merge_rq(struct request_queue *rq, 296 struct request *r1, struct request *r2) 297 { 298 return true; 299 } 300 static inline bool blk_integrity_merge_bio(struct request_queue *rq, 301 struct request *r, struct bio *b) 302 { 303 return true; 304 } 305 static inline bool integrity_req_gap_back_merge(struct request *req, 306 struct bio *next) 307 { 308 return false; 309 } 310 static inline bool integrity_req_gap_front_merge(struct request *req, 311 struct bio *bio) 312 { 313 return false; 314 } 315 316 static inline void blk_flush_integrity(void) 317 { 318 } 319 static inline bool bio_integrity_endio(struct bio *bio) 320 { 321 return true; 322 } 323 static inline void bio_integrity_free(struct bio *bio) 324 { 325 } 326 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 327 328 unsigned long blk_rq_timeout(unsigned long timeout); 329 void blk_add_timer(struct request *req); 330 331 enum bio_merge_status { 332 BIO_MERGE_OK, 333 BIO_MERGE_NONE, 334 BIO_MERGE_FAILED, 335 }; 336 337 enum bio_merge_status bio_attempt_back_merge(struct request *req, 338 struct bio *bio, unsigned int nr_segs); 339 bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, 340 unsigned int nr_segs); 341 bool blk_bio_list_merge(struct request_queue *q, struct list_head *list, 342 struct bio *bio, unsigned int nr_segs); 343 344 /* 345 * Plug flush limits 346 */ 347 #define BLK_MAX_REQUEST_COUNT 32 348 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 349 350 /* 351 * Internal elevator interface 352 */ 353 #define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) 354 355 bool blk_insert_flush(struct request *rq); 356 357 void elv_update_nr_hw_queues(struct request_queue *q, 358 struct elv_change_ctx *ctx); 359 void elevator_set_default(struct request_queue *q); 360 void elevator_set_none(struct request_queue *q); 361 362 ssize_t part_size_show(struct device *dev, struct device_attribute *attr, 363 char *buf); 364 ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, 365 char *buf); 366 ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, 367 char *buf); 368 ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, 369 char *buf); 370 ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, 371 const char *buf, size_t count); 372 ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); 373 ssize_t part_timeout_store(struct device *, struct device_attribute *, 374 const char *, size_t); 375 376 struct bio *bio_split_discard(struct bio *bio, const struct queue_limits *lim, 377 unsigned *nsegs); 378 struct bio *bio_split_write_zeroes(struct bio *bio, 379 const struct queue_limits *lim, unsigned *nsegs); 380 struct bio *bio_split_rw(struct bio *bio, const struct queue_limits *lim, 381 unsigned *nr_segs); 382 struct bio *bio_split_zone_append(struct bio *bio, 383 const struct queue_limits *lim, unsigned *nr_segs); 384 385 /* 386 * All drivers must accept single-segments bios that are smaller than PAGE_SIZE. 387 * 388 * This is a quick and dirty check that relies on the fact that bi_io_vec[0] is 389 * always valid if a bio has data. The check might lead to occasional false 390 * positives when bios are cloned, but compared to the performance impact of 391 * cloned bios themselves the loop below doesn't matter anyway. 392 */ 393 static inline bool bio_may_need_split(struct bio *bio, 394 const struct queue_limits *lim) 395 { 396 const struct bio_vec *bv; 397 398 if (lim->chunk_sectors) 399 return true; 400 401 if (!bio->bi_io_vec) 402 return true; 403 404 bv = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter); 405 if (bio->bi_iter.bi_size > bv->bv_len - bio->bi_iter.bi_bvec_done) 406 return true; 407 return bv->bv_len + bv->bv_offset > lim->max_fast_segment_size; 408 } 409 410 /** 411 * __bio_split_to_limits - split a bio to fit the queue limits 412 * @bio: bio to be split 413 * @lim: queue limits to split based on 414 * @nr_segs: returns the number of segments in the returned bio 415 * 416 * Check if @bio needs splitting based on the queue limits, and if so split off 417 * a bio fitting the limits from the beginning of @bio and return it. @bio is 418 * shortened to the remainder and re-submitted. 419 * 420 * The split bio is allocated from @q->bio_split, which is provided by the 421 * block layer. 422 */ 423 static inline struct bio *__bio_split_to_limits(struct bio *bio, 424 const struct queue_limits *lim, unsigned int *nr_segs) 425 { 426 switch (bio_op(bio)) { 427 case REQ_OP_READ: 428 case REQ_OP_WRITE: 429 if (bio_may_need_split(bio, lim)) 430 return bio_split_rw(bio, lim, nr_segs); 431 *nr_segs = 1; 432 return bio; 433 case REQ_OP_ZONE_APPEND: 434 return bio_split_zone_append(bio, lim, nr_segs); 435 case REQ_OP_DISCARD: 436 case REQ_OP_SECURE_ERASE: 437 return bio_split_discard(bio, lim, nr_segs); 438 case REQ_OP_WRITE_ZEROES: 439 return bio_split_write_zeroes(bio, lim, nr_segs); 440 default: 441 /* other operations can't be split */ 442 *nr_segs = 0; 443 return bio; 444 } 445 } 446 447 /** 448 * get_max_segment_size() - maximum number of bytes to add as a single segment 449 * @lim: Request queue limits. 450 * @paddr: address of the range to add 451 * @len: maximum length available to add at @paddr 452 * 453 * Returns the maximum number of bytes of the range starting at @paddr that can 454 * be added to a single segment. 455 */ 456 static inline unsigned get_max_segment_size(const struct queue_limits *lim, 457 phys_addr_t paddr, unsigned int len) 458 { 459 /* 460 * Prevent an overflow if mask = ULONG_MAX and offset = 0 by adding 1 461 * after having calculated the minimum. 462 */ 463 return min_t(unsigned long, len, 464 min(lim->seg_boundary_mask - (lim->seg_boundary_mask & paddr), 465 (unsigned long)lim->max_segment_size - 1) + 1); 466 } 467 468 int ll_back_merge_fn(struct request *req, struct bio *bio, 469 unsigned int nr_segs); 470 bool blk_attempt_req_merge(struct request_queue *q, struct request *rq, 471 struct request *next); 472 unsigned int blk_recalc_rq_segments(struct request *rq); 473 bool blk_rq_merge_ok(struct request *rq, struct bio *bio); 474 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); 475 476 int blk_set_default_limits(struct queue_limits *lim); 477 void blk_apply_bdi_limits(struct backing_dev_info *bdi, 478 struct queue_limits *lim); 479 int blk_dev_init(void); 480 481 void update_io_ticks(struct block_device *part, unsigned long now, bool end); 482 483 static inline void req_set_nomerge(struct request_queue *q, struct request *req) 484 { 485 req->cmd_flags |= REQ_NOMERGE; 486 if (req == q->last_merge) 487 q->last_merge = NULL; 488 } 489 490 /* 491 * Internal io_context interface 492 */ 493 struct io_cq *ioc_find_get_icq(struct request_queue *q); 494 struct io_cq *ioc_lookup_icq(struct request_queue *q); 495 #ifdef CONFIG_BLK_ICQ 496 void ioc_clear_queue(struct request_queue *q); 497 #else 498 static inline void ioc_clear_queue(struct request_queue *q) 499 { 500 } 501 #endif /* CONFIG_BLK_ICQ */ 502 503 #ifdef CONFIG_BLK_DEV_ZONED 504 void disk_init_zone_resources(struct gendisk *disk); 505 void disk_free_zone_resources(struct gendisk *disk); 506 static inline bool bio_zone_write_plugging(struct bio *bio) 507 { 508 return bio_flagged(bio, BIO_ZONE_WRITE_PLUGGING); 509 } 510 static inline bool blk_req_bio_is_zone_append(struct request *rq, 511 struct bio *bio) 512 { 513 return req_op(rq) == REQ_OP_ZONE_APPEND || 514 bio_flagged(bio, BIO_EMULATES_ZONE_APPEND); 515 } 516 void blk_zone_write_plug_bio_merged(struct bio *bio); 517 void blk_zone_write_plug_init_request(struct request *rq); 518 void blk_zone_append_update_request_bio(struct request *rq, struct bio *bio); 519 void blk_zone_mgmt_bio_endio(struct bio *bio); 520 void blk_zone_write_plug_bio_endio(struct bio *bio); 521 static inline void blk_zone_bio_endio(struct bio *bio) 522 { 523 /* 524 * Zone management BIOs may impact zone write plugs (e.g. a zone reset 525 * changes a zone write plug zone write pointer offset), but these 526 * operation do not go through zone write plugging as they may operate 527 * on zones that do not have a zone write 528 * plug. blk_zone_mgmt_bio_endio() handles the potential changes to zone 529 * write plugs that are present. 530 */ 531 if (op_is_zone_mgmt(bio_op(bio))) { 532 blk_zone_mgmt_bio_endio(bio); 533 return; 534 } 535 536 /* 537 * For write BIOs to zoned devices, signal the completion of the BIO so 538 * that the next write BIO can be submitted by zone write plugging. 539 */ 540 if (bio_zone_write_plugging(bio)) 541 blk_zone_write_plug_bio_endio(bio); 542 } 543 544 void blk_zone_write_plug_finish_request(struct request *rq); 545 static inline void blk_zone_finish_request(struct request *rq) 546 { 547 if (rq->rq_flags & RQF_ZONE_WRITE_PLUGGING) 548 blk_zone_write_plug_finish_request(rq); 549 } 550 int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, 551 unsigned long arg); 552 int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, 553 unsigned int cmd, unsigned long arg); 554 #else /* CONFIG_BLK_DEV_ZONED */ 555 static inline void disk_init_zone_resources(struct gendisk *disk) 556 { 557 } 558 static inline void disk_free_zone_resources(struct gendisk *disk) 559 { 560 } 561 static inline bool bio_zone_write_plugging(struct bio *bio) 562 { 563 return false; 564 } 565 static inline bool blk_req_bio_is_zone_append(struct request *req, 566 struct bio *bio) 567 { 568 return false; 569 } 570 static inline void blk_zone_write_plug_bio_merged(struct bio *bio) 571 { 572 } 573 static inline void blk_zone_write_plug_init_request(struct request *rq) 574 { 575 } 576 static inline void blk_zone_append_update_request_bio(struct request *rq, 577 struct bio *bio) 578 { 579 } 580 static inline void blk_zone_bio_endio(struct bio *bio) 581 { 582 } 583 static inline void blk_zone_finish_request(struct request *rq) 584 { 585 } 586 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 587 unsigned int cmd, unsigned long arg) 588 { 589 return -ENOTTY; 590 } 591 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 592 blk_mode_t mode, unsigned int cmd, unsigned long arg) 593 { 594 return -ENOTTY; 595 } 596 #endif /* CONFIG_BLK_DEV_ZONED */ 597 598 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 599 void bdev_add(struct block_device *bdev, dev_t dev); 600 void bdev_unhash(struct block_device *bdev); 601 void bdev_drop(struct block_device *bdev); 602 603 int blk_alloc_ext_minor(void); 604 void blk_free_ext_minor(unsigned int minor); 605 #define ADDPART_FLAG_NONE 0 606 #define ADDPART_FLAG_RAID 1 607 #define ADDPART_FLAG_WHOLEDISK 2 608 #define ADDPART_FLAG_READONLY 4 609 int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, 610 sector_t length); 611 int bdev_del_partition(struct gendisk *disk, int partno); 612 int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start, 613 sector_t length); 614 void drop_partition(struct block_device *part); 615 616 void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors); 617 618 struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, 619 struct lock_class_key *lkclass); 620 struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id); 621 622 int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode); 623 624 int disk_alloc_events(struct gendisk *disk); 625 void disk_add_events(struct gendisk *disk); 626 void disk_del_events(struct gendisk *disk); 627 void disk_release_events(struct gendisk *disk); 628 void disk_block_events(struct gendisk *disk); 629 void disk_unblock_events(struct gendisk *disk); 630 void disk_flush_events(struct gendisk *disk, unsigned int mask); 631 extern struct device_attribute dev_attr_events; 632 extern struct device_attribute dev_attr_events_async; 633 extern struct device_attribute dev_attr_events_poll_msecs; 634 635 extern struct attribute_group blk_trace_attr_group; 636 637 blk_mode_t file_to_blk_mode(struct file *file); 638 int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode, 639 loff_t lstart, loff_t lend); 640 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); 641 int blkdev_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags); 642 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); 643 644 extern const struct address_space_operations def_blk_aops; 645 646 int disk_register_independent_access_ranges(struct gendisk *disk); 647 void disk_unregister_independent_access_ranges(struct gendisk *disk); 648 649 int should_fail_bio(struct bio *bio); 650 #ifdef CONFIG_FAIL_MAKE_REQUEST 651 bool should_fail_request(struct block_device *part, unsigned int bytes); 652 #else /* CONFIG_FAIL_MAKE_REQUEST */ 653 static inline bool should_fail_request(struct block_device *part, 654 unsigned int bytes) 655 { 656 return false; 657 } 658 #endif /* CONFIG_FAIL_MAKE_REQUEST */ 659 660 /* 661 * Optimized request reference counting. Ideally we'd make timeouts be more 662 * clever, as that's the only reason we need references at all... But until 663 * this happens, this is faster than using refcount_t. Also see: 664 * 665 * abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count") 666 */ 667 #define req_ref_zero_or_close_to_overflow(req) \ 668 ((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u) 669 670 static inline bool req_ref_inc_not_zero(struct request *req) 671 { 672 return atomic_inc_not_zero(&req->ref); 673 } 674 675 static inline bool req_ref_put_and_test(struct request *req) 676 { 677 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); 678 return atomic_dec_and_test(&req->ref); 679 } 680 681 static inline void req_ref_set(struct request *req, int value) 682 { 683 atomic_set(&req->ref, value); 684 } 685 686 static inline int req_ref_read(struct request *req) 687 { 688 return atomic_read(&req->ref); 689 } 690 691 static inline u64 blk_time_get_ns(void) 692 { 693 struct blk_plug *plug = current->plug; 694 695 if (!plug || !in_task()) 696 return ktime_get_ns(); 697 698 /* 699 * 0 could very well be a valid time, but rather than flag "this is 700 * a valid timestamp" separately, just accept that we'll do an extra 701 * ktime_get_ns() if we just happen to get 0 as the current time. 702 */ 703 if (!plug->cur_ktime) { 704 plug->cur_ktime = ktime_get_ns(); 705 current->flags |= PF_BLOCK_TS; 706 } 707 return plug->cur_ktime; 708 } 709 710 static inline ktime_t blk_time_get(void) 711 { 712 return ns_to_ktime(blk_time_get_ns()); 713 } 714 715 void bdev_release(struct file *bdev_file); 716 int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder, 717 const struct blk_holder_ops *hops, struct file *bdev_file); 718 int bdev_permission(dev_t dev, blk_mode_t mode, void *holder); 719 720 void bio_integrity_generate(struct bio *bio); 721 blk_status_t bio_integrity_verify(struct bio *bio, 722 struct bvec_iter *saved_iter); 723 724 void blk_integrity_prepare(struct request *rq); 725 void blk_integrity_complete(struct request *rq, unsigned int nr_bytes); 726 727 #ifdef CONFIG_LOCKDEP 728 static inline void blk_freeze_acquire_lock(struct request_queue *q) 729 { 730 if (!q->mq_freeze_disk_dead) 731 rwsem_acquire(&q->io_lockdep_map, 0, 1, _RET_IP_); 732 if (!q->mq_freeze_queue_dying) 733 rwsem_acquire(&q->q_lockdep_map, 0, 1, _RET_IP_); 734 } 735 736 static inline void blk_unfreeze_release_lock(struct request_queue *q) 737 { 738 if (!q->mq_freeze_queue_dying) 739 rwsem_release(&q->q_lockdep_map, _RET_IP_); 740 if (!q->mq_freeze_disk_dead) 741 rwsem_release(&q->io_lockdep_map, _RET_IP_); 742 } 743 #else 744 static inline void blk_freeze_acquire_lock(struct request_queue *q) 745 { 746 } 747 static inline void blk_unfreeze_release_lock(struct request_queue *q) 748 { 749 } 750 #endif 751 752 /* 753 * debugfs directory and file creation can trigger fs reclaim, which can enter 754 * back into the block layer request_queue. This can cause deadlock if the 755 * queue is frozen. Use NOIO context together with debugfs_mutex to prevent fs 756 * reclaim from triggering block I/O. 757 */ 758 static inline void blk_debugfs_lock_nomemsave(struct request_queue *q) 759 { 760 mutex_lock(&q->debugfs_mutex); 761 } 762 763 static inline void blk_debugfs_unlock_nomemrestore(struct request_queue *q) 764 { 765 mutex_unlock(&q->debugfs_mutex); 766 } 767 768 static inline unsigned int __must_check blk_debugfs_lock(struct request_queue *q) 769 { 770 unsigned int memflags = memalloc_noio_save(); 771 772 blk_debugfs_lock_nomemsave(q); 773 return memflags; 774 } 775 776 static inline void blk_debugfs_unlock(struct request_queue *q, 777 unsigned int memflags) 778 { 779 blk_debugfs_unlock_nomemrestore(q); 780 memalloc_noio_restore(memflags); 781 } 782 783 #endif /* BLK_INTERNAL_H */ 784