1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef BLK_INTERNAL_H 3#define BLK_INTERNAL_H 4 5#include <linux/blk-crypto.h> 6#include <linux/memblock.h> /* for max_pfn/max_low_pfn */ 7#include <linux/sched/sysctl.h> 8#include <linux/timekeeping.h> 9#include <xen/xen.h> 10#include "blk-crypto-internal.h" 11 12struct elevator_type; 13 14/* Max future timer expiry for timeouts */ 15#define BLK_MAX_TIMEOUT (5 * HZ) 16 17extern struct dentry *blk_debugfs_root; 18 19struct blk_flush_queue { 20 spinlock_t mq_flush_lock; 21 unsigned int flush_pending_idx:1; 22 unsigned int flush_running_idx:1; 23 blk_status_t rq_status; 24 unsigned long flush_pending_since; 25 struct list_head flush_queue[2]; 26 unsigned long flush_data_in_flight; 27 struct request *flush_rq; 28}; 29 30bool is_flush_rq(struct request *req); 31 32struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size, 33 gfp_t flags); 34void blk_free_flush_queue(struct blk_flush_queue *q); 35 36void blk_freeze_queue(struct request_queue *q); 37void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic); 38void blk_queue_start_drain(struct request_queue *q); 39int __bio_queue_enter(struct request_queue *q, struct bio *bio); 40void submit_bio_noacct_nocheck(struct bio *bio); 41void bio_await_chain(struct bio *bio); 42 43static inline bool blk_try_enter_queue(struct request_queue *q, bool pm) 44{ 45 rcu_read_lock(); 46 if (!percpu_ref_tryget_live_rcu(&q->q_usage_counter)) 47 goto fail; 48 49 /* 50 * The code that increments the pm_only counter must ensure that the 51 * counter is globally visible before the queue is unfrozen. 52 */ 53 if (blk_queue_pm_only(q) && 54 (!pm || queue_rpm_status(q) == RPM_SUSPENDED)) 55 goto fail_put; 56 57 rcu_read_unlock(); 58 return true; 59 60fail_put: 61 blk_queue_exit(q); 62fail: 63 rcu_read_unlock(); 64 return false; 65} 66 67static inline int bio_queue_enter(struct bio *bio) 68{ 69 struct request_queue *q = bdev_get_queue(bio->bi_bdev); 70 71 if (blk_try_enter_queue(q, false)) 72 return 0; 73 return __bio_queue_enter(q, bio); 74} 75 76static inline void blk_wait_io(struct completion *done) 77{ 78 /* Prevent hang_check timer from firing at us during very long I/O */ 79 unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2; 80 81 if (timeout) 82 while (!wait_for_completion_io_timeout(done, timeout)) 83 ; 84 else 85 wait_for_completion_io(done); 86} 87 88#define BIO_INLINE_VECS 4 89struct bio_vec *bvec_alloc(mempool_t *pool, unsigned short *nr_vecs, 90 gfp_t gfp_mask); 91void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned short nr_vecs); 92 93bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv, 94 struct page *page, unsigned len, unsigned offset, 95 bool *same_page); 96 97static inline bool biovec_phys_mergeable(struct request_queue *q, 98 struct bio_vec *vec1, struct bio_vec *vec2) 99{ 100 unsigned long mask = queue_segment_boundary(q); 101 phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset; 102 phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset; 103 104 /* 105 * Merging adjacent physical pages may not work correctly under KMSAN 106 * if their metadata pages aren't adjacent. Just disable merging. 107 */ 108 if (IS_ENABLED(CONFIG_KMSAN)) 109 return false; 110 111 if (addr1 + vec1->bv_len != addr2) 112 return false; 113 if (xen_domain() && !xen_biovec_phys_mergeable(vec1, vec2->bv_page)) 114 return false; 115 if ((addr1 | mask) != ((addr2 + vec2->bv_len - 1) | mask)) 116 return false; 117 return true; 118} 119 120static inline bool __bvec_gap_to_prev(const struct queue_limits *lim, 121 struct bio_vec *bprv, unsigned int offset) 122{ 123 return (offset & lim->virt_boundary_mask) || 124 ((bprv->bv_offset + bprv->bv_len) & lim->virt_boundary_mask); 125} 126 127/* 128 * Check if adding a bio_vec after bprv with offset would create a gap in 129 * the SG list. Most drivers don't care about this, but some do. 130 */ 131static inline bool bvec_gap_to_prev(const struct queue_limits *lim, 132 struct bio_vec *bprv, unsigned int offset) 133{ 134 if (!lim->virt_boundary_mask) 135 return false; 136 return __bvec_gap_to_prev(lim, bprv, offset); 137} 138 139static inline bool rq_mergeable(struct request *rq) 140{ 141 if (blk_rq_is_passthrough(rq)) 142 return false; 143 144 if (req_op(rq) == REQ_OP_FLUSH) 145 return false; 146 147 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 148 return false; 149 150 if (req_op(rq) == REQ_OP_ZONE_APPEND) 151 return false; 152 153 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 154 return false; 155 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 156 return false; 157 158 return true; 159} 160 161/* 162 * There are two different ways to handle DISCARD merges: 163 * 1) If max_discard_segments > 1, the driver treats every bio as a range and 164 * send the bios to controller together. The ranges don't need to be 165 * contiguous. 166 * 2) Otherwise, the request will be normal read/write requests. The ranges 167 * need to be contiguous. 168 */ 169static inline bool blk_discard_mergable(struct request *req) 170{ 171 if (req_op(req) == REQ_OP_DISCARD && 172 queue_max_discard_segments(req->q) > 1) 173 return true; 174 return false; 175} 176 177static inline unsigned int blk_rq_get_max_segments(struct request *rq) 178{ 179 if (req_op(rq) == REQ_OP_DISCARD) 180 return queue_max_discard_segments(rq->q); 181 return queue_max_segments(rq->q); 182} 183 184static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 185 enum req_op op) 186{ 187 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 188 return min(q->limits.max_discard_sectors, 189 UINT_MAX >> SECTOR_SHIFT); 190 191 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 192 return q->limits.max_write_zeroes_sectors; 193 194 return q->limits.max_sectors; 195} 196 197#ifdef CONFIG_BLK_DEV_INTEGRITY 198void blk_flush_integrity(void); 199bool __bio_integrity_endio(struct bio *); 200void bio_integrity_free(struct bio *bio); 201static inline bool bio_integrity_endio(struct bio *bio) 202{ 203 if (bio_integrity(bio)) 204 return __bio_integrity_endio(bio); 205 return true; 206} 207 208bool blk_integrity_merge_rq(struct request_queue *, struct request *, 209 struct request *); 210bool blk_integrity_merge_bio(struct request_queue *, struct request *, 211 struct bio *); 212 213static inline bool integrity_req_gap_back_merge(struct request *req, 214 struct bio *next) 215{ 216 struct bio_integrity_payload *bip = bio_integrity(req->bio); 217 struct bio_integrity_payload *bip_next = bio_integrity(next); 218 219 return bvec_gap_to_prev(&req->q->limits, 220 &bip->bip_vec[bip->bip_vcnt - 1], 221 bip_next->bip_vec[0].bv_offset); 222} 223 224static inline bool integrity_req_gap_front_merge(struct request *req, 225 struct bio *bio) 226{ 227 struct bio_integrity_payload *bip = bio_integrity(bio); 228 struct bio_integrity_payload *bip_next = bio_integrity(req->bio); 229 230 return bvec_gap_to_prev(&req->q->limits, 231 &bip->bip_vec[bip->bip_vcnt - 1], 232 bip_next->bip_vec[0].bv_offset); 233} 234 235extern const struct attribute_group blk_integrity_attr_group; 236#else /* CONFIG_BLK_DEV_INTEGRITY */ 237static inline bool blk_integrity_merge_rq(struct request_queue *rq, 238 struct request *r1, struct request *r2) 239{ 240 return true; 241} 242static inline bool blk_integrity_merge_bio(struct request_queue *rq, 243 struct request *r, struct bio *b) 244{ 245 return true; 246} 247static inline bool integrity_req_gap_back_merge(struct request *req, 248 struct bio *next) 249{ 250 return false; 251} 252static inline bool integrity_req_gap_front_merge(struct request *req, 253 struct bio *bio) 254{ 255 return false; 256} 257 258static inline void blk_flush_integrity(void) 259{ 260} 261static inline bool bio_integrity_endio(struct bio *bio) 262{ 263 return true; 264} 265static inline void bio_integrity_free(struct bio *bio) 266{ 267} 268#endif /* CONFIG_BLK_DEV_INTEGRITY */ 269 270unsigned long blk_rq_timeout(unsigned long timeout); 271void blk_add_timer(struct request *req); 272 273enum bio_merge_status { 274 BIO_MERGE_OK, 275 BIO_MERGE_NONE, 276 BIO_MERGE_FAILED, 277}; 278 279enum bio_merge_status bio_attempt_back_merge(struct request *req, 280 struct bio *bio, unsigned int nr_segs); 281bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio, 282 unsigned int nr_segs); 283bool blk_bio_list_merge(struct request_queue *q, struct list_head *list, 284 struct bio *bio, unsigned int nr_segs); 285 286/* 287 * Plug flush limits 288 */ 289#define BLK_MAX_REQUEST_COUNT 32 290#define BLK_PLUG_FLUSH_SIZE (128 * 1024) 291 292/* 293 * Internal elevator interface 294 */ 295#define ELV_ON_HASH(rq) ((rq)->rq_flags & RQF_HASHED) 296 297bool blk_insert_flush(struct request *rq); 298 299int elevator_switch(struct request_queue *q, struct elevator_type *new_e); 300void elevator_disable(struct request_queue *q); 301void elevator_exit(struct request_queue *q); 302int elv_register_queue(struct request_queue *q, bool uevent); 303void elv_unregister_queue(struct request_queue *q); 304 305ssize_t part_size_show(struct device *dev, struct device_attribute *attr, 306 char *buf); 307ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, 308 char *buf); 309ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, 310 char *buf); 311ssize_t part_fail_show(struct device *dev, struct device_attribute *attr, 312 char *buf); 313ssize_t part_fail_store(struct device *dev, struct device_attribute *attr, 314 const char *buf, size_t count); 315ssize_t part_timeout_show(struct device *, struct device_attribute *, char *); 316ssize_t part_timeout_store(struct device *, struct device_attribute *, 317 const char *, size_t); 318 319static inline bool bio_may_exceed_limits(struct bio *bio, 320 const struct queue_limits *lim) 321{ 322 switch (bio_op(bio)) { 323 case REQ_OP_DISCARD: 324 case REQ_OP_SECURE_ERASE: 325 case REQ_OP_WRITE_ZEROES: 326 return true; /* non-trivial splitting decisions */ 327 default: 328 break; 329 } 330 331 /* 332 * All drivers must accept single-segments bios that are <= PAGE_SIZE. 333 * This is a quick and dirty check that relies on the fact that 334 * bi_io_vec[0] is always valid if a bio has data. The check might 335 * lead to occasional false negatives when bios are cloned, but compared 336 * to the performance impact of cloned bios themselves the loop below 337 * doesn't matter anyway. 338 */ 339 return lim->chunk_sectors || bio->bi_vcnt != 1 || 340 bio->bi_io_vec->bv_len + bio->bi_io_vec->bv_offset > PAGE_SIZE; 341} 342 343struct bio *__bio_split_to_limits(struct bio *bio, 344 const struct queue_limits *lim, 345 unsigned int *nr_segs); 346int ll_back_merge_fn(struct request *req, struct bio *bio, 347 unsigned int nr_segs); 348bool blk_attempt_req_merge(struct request_queue *q, struct request *rq, 349 struct request *next); 350unsigned int blk_recalc_rq_segments(struct request *rq); 351bool blk_rq_merge_ok(struct request *rq, struct bio *bio); 352enum elv_merge blk_try_merge(struct request *rq, struct bio *bio); 353 354int blk_set_default_limits(struct queue_limits *lim); 355int blk_dev_init(void); 356 357/* 358 * Contribute to IO statistics IFF: 359 * 360 * a) it's attached to a gendisk, and 361 * b) the queue had IO stats enabled when this request was started 362 */ 363static inline bool blk_do_io_stat(struct request *rq) 364{ 365 return (rq->rq_flags & RQF_IO_STAT) && !blk_rq_is_passthrough(rq); 366} 367 368void update_io_ticks(struct block_device *part, unsigned long now, bool end); 369unsigned int part_in_flight(struct block_device *part); 370 371static inline void req_set_nomerge(struct request_queue *q, struct request *req) 372{ 373 req->cmd_flags |= REQ_NOMERGE; 374 if (req == q->last_merge) 375 q->last_merge = NULL; 376} 377 378/* 379 * Internal io_context interface 380 */ 381struct io_cq *ioc_find_get_icq(struct request_queue *q); 382struct io_cq *ioc_lookup_icq(struct request_queue *q); 383#ifdef CONFIG_BLK_ICQ 384void ioc_clear_queue(struct request_queue *q); 385#else 386static inline void ioc_clear_queue(struct request_queue *q) 387{ 388} 389#endif /* CONFIG_BLK_ICQ */ 390 391struct bio *__blk_queue_bounce(struct bio *bio, struct request_queue *q); 392 393static inline bool blk_queue_may_bounce(struct request_queue *q) 394{ 395 return IS_ENABLED(CONFIG_BOUNCE) && 396 q->limits.bounce == BLK_BOUNCE_HIGH && 397 max_low_pfn >= max_pfn; 398} 399 400static inline struct bio *blk_queue_bounce(struct bio *bio, 401 struct request_queue *q) 402{ 403 if (unlikely(blk_queue_may_bounce(q) && bio_has_data(bio))) 404 return __blk_queue_bounce(bio, q); 405 return bio; 406} 407 408#ifdef CONFIG_BLK_DEV_ZONED 409void disk_init_zone_resources(struct gendisk *disk); 410void disk_free_zone_resources(struct gendisk *disk); 411static inline bool bio_zone_write_plugging(struct bio *bio) 412{ 413 return bio_flagged(bio, BIO_ZONE_WRITE_PLUGGING); 414} 415static inline bool bio_is_zone_append(struct bio *bio) 416{ 417 return bio_op(bio) == REQ_OP_ZONE_APPEND || 418 bio_flagged(bio, BIO_EMULATES_ZONE_APPEND); 419} 420void blk_zone_write_plug_bio_merged(struct bio *bio); 421void blk_zone_write_plug_init_request(struct request *rq); 422static inline void blk_zone_update_request_bio(struct request *rq, 423 struct bio *bio) 424{ 425 /* 426 * For zone append requests, the request sector indicates the location 427 * at which the BIO data was written. Return this value to the BIO 428 * issuer through the BIO iter sector. 429 * For plugged zone writes, which include emulated zone append, we need 430 * the original BIO sector so that blk_zone_write_plug_bio_endio() can 431 * lookup the zone write plug. 432 */ 433 if (req_op(rq) == REQ_OP_ZONE_APPEND || bio_zone_write_plugging(bio)) 434 bio->bi_iter.bi_sector = rq->__sector; 435} 436void blk_zone_write_plug_bio_endio(struct bio *bio); 437static inline void blk_zone_bio_endio(struct bio *bio) 438{ 439 /* 440 * For write BIOs to zoned devices, signal the completion of the BIO so 441 * that the next write BIO can be submitted by zone write plugging. 442 */ 443 if (bio_zone_write_plugging(bio)) 444 blk_zone_write_plug_bio_endio(bio); 445} 446 447void blk_zone_write_plug_finish_request(struct request *rq); 448static inline void blk_zone_finish_request(struct request *rq) 449{ 450 if (rq->rq_flags & RQF_ZONE_WRITE_PLUGGING) 451 blk_zone_write_plug_finish_request(rq); 452} 453int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, 454 unsigned long arg); 455int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, 456 unsigned int cmd, unsigned long arg); 457#else /* CONFIG_BLK_DEV_ZONED */ 458static inline void disk_init_zone_resources(struct gendisk *disk) 459{ 460} 461static inline void disk_free_zone_resources(struct gendisk *disk) 462{ 463} 464static inline bool bio_zone_write_plugging(struct bio *bio) 465{ 466 return false; 467} 468static inline bool bio_is_zone_append(struct bio *bio) 469{ 470 return false; 471} 472static inline void blk_zone_write_plug_bio_merged(struct bio *bio) 473{ 474} 475static inline void blk_zone_write_plug_init_request(struct request *rq) 476{ 477} 478static inline void blk_zone_update_request_bio(struct request *rq, 479 struct bio *bio) 480{ 481} 482static inline void blk_zone_bio_endio(struct bio *bio) 483{ 484} 485static inline void blk_zone_finish_request(struct request *rq) 486{ 487} 488static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 489 unsigned int cmd, unsigned long arg) 490{ 491 return -ENOTTY; 492} 493static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 494 blk_mode_t mode, unsigned int cmd, unsigned long arg) 495{ 496 return -ENOTTY; 497} 498#endif /* CONFIG_BLK_DEV_ZONED */ 499 500struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 501void bdev_add(struct block_device *bdev, dev_t dev); 502 503int blk_alloc_ext_minor(void); 504void blk_free_ext_minor(unsigned int minor); 505#define ADDPART_FLAG_NONE 0 506#define ADDPART_FLAG_RAID 1 507#define ADDPART_FLAG_WHOLEDISK 2 508int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, 509 sector_t length); 510int bdev_del_partition(struct gendisk *disk, int partno); 511int bdev_resize_partition(struct gendisk *disk, int partno, sector_t start, 512 sector_t length); 513void drop_partition(struct block_device *part); 514 515void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors); 516 517struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, 518 struct lock_class_key *lkclass); 519 520int bio_add_hw_page(struct request_queue *q, struct bio *bio, 521 struct page *page, unsigned int len, unsigned int offset, 522 unsigned int max_sectors, bool *same_page); 523 524/* 525 * Clean up a page appropriately, where the page may be pinned, may have a 526 * ref taken on it or neither. 527 */ 528static inline void bio_release_page(struct bio *bio, struct page *page) 529{ 530 if (bio_flagged(bio, BIO_PAGE_PINNED)) 531 unpin_user_page(page); 532} 533 534struct request_queue *blk_alloc_queue(struct queue_limits *lim, int node_id); 535 536int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode); 537 538int disk_alloc_events(struct gendisk *disk); 539void disk_add_events(struct gendisk *disk); 540void disk_del_events(struct gendisk *disk); 541void disk_release_events(struct gendisk *disk); 542void disk_block_events(struct gendisk *disk); 543void disk_unblock_events(struct gendisk *disk); 544void disk_flush_events(struct gendisk *disk, unsigned int mask); 545extern struct device_attribute dev_attr_events; 546extern struct device_attribute dev_attr_events_async; 547extern struct device_attribute dev_attr_events_poll_msecs; 548 549extern struct attribute_group blk_trace_attr_group; 550 551blk_mode_t file_to_blk_mode(struct file *file); 552int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode, 553 loff_t lstart, loff_t lend); 554long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); 555long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); 556 557extern const struct address_space_operations def_blk_aops; 558 559int disk_register_independent_access_ranges(struct gendisk *disk); 560void disk_unregister_independent_access_ranges(struct gendisk *disk); 561 562#ifdef CONFIG_FAIL_MAKE_REQUEST 563bool should_fail_request(struct block_device *part, unsigned int bytes); 564#else /* CONFIG_FAIL_MAKE_REQUEST */ 565static inline bool should_fail_request(struct block_device *part, 566 unsigned int bytes) 567{ 568 return false; 569} 570#endif /* CONFIG_FAIL_MAKE_REQUEST */ 571 572/* 573 * Optimized request reference counting. Ideally we'd make timeouts be more 574 * clever, as that's the only reason we need references at all... But until 575 * this happens, this is faster than using refcount_t. Also see: 576 * 577 * abc54d634334 ("io_uring: switch to atomic_t for io_kiocb reference count") 578 */ 579#define req_ref_zero_or_close_to_overflow(req) \ 580 ((unsigned int) atomic_read(&(req->ref)) + 127u <= 127u) 581 582static inline bool req_ref_inc_not_zero(struct request *req) 583{ 584 return atomic_inc_not_zero(&req->ref); 585} 586 587static inline bool req_ref_put_and_test(struct request *req) 588{ 589 WARN_ON_ONCE(req_ref_zero_or_close_to_overflow(req)); 590 return atomic_dec_and_test(&req->ref); 591} 592 593static inline void req_ref_set(struct request *req, int value) 594{ 595 atomic_set(&req->ref, value); 596} 597 598static inline int req_ref_read(struct request *req) 599{ 600 return atomic_read(&req->ref); 601} 602 603static inline u64 blk_time_get_ns(void) 604{ 605 struct blk_plug *plug = current->plug; 606 607 if (!plug || !in_task()) 608 return ktime_get_ns(); 609 610 /* 611 * 0 could very well be a valid time, but rather than flag "this is 612 * a valid timestamp" separately, just accept that we'll do an extra 613 * ktime_get_ns() if we just happen to get 0 as the current time. 614 */ 615 if (!plug->cur_ktime) { 616 plug->cur_ktime = ktime_get_ns(); 617 current->flags |= PF_BLOCK_TS; 618 } 619 return plug->cur_ktime; 620} 621 622static inline ktime_t blk_time_get(void) 623{ 624 return ns_to_ktime(blk_time_get_ns()); 625} 626 627/* 628 * From most significant bit: 629 * 1 bit: reserved for other usage, see below 630 * 12 bits: original size of bio 631 * 51 bits: issue time of bio 632 */ 633#define BIO_ISSUE_RES_BITS 1 634#define BIO_ISSUE_SIZE_BITS 12 635#define BIO_ISSUE_RES_SHIFT (64 - BIO_ISSUE_RES_BITS) 636#define BIO_ISSUE_SIZE_SHIFT (BIO_ISSUE_RES_SHIFT - BIO_ISSUE_SIZE_BITS) 637#define BIO_ISSUE_TIME_MASK ((1ULL << BIO_ISSUE_SIZE_SHIFT) - 1) 638#define BIO_ISSUE_SIZE_MASK \ 639 (((1ULL << BIO_ISSUE_SIZE_BITS) - 1) << BIO_ISSUE_SIZE_SHIFT) 640#define BIO_ISSUE_RES_MASK (~((1ULL << BIO_ISSUE_RES_SHIFT) - 1)) 641 642/* Reserved bit for blk-throtl */ 643#define BIO_ISSUE_THROTL_SKIP_LATENCY (1ULL << 63) 644 645static inline u64 __bio_issue_time(u64 time) 646{ 647 return time & BIO_ISSUE_TIME_MASK; 648} 649 650static inline u64 bio_issue_time(struct bio_issue *issue) 651{ 652 return __bio_issue_time(issue->value); 653} 654 655static inline sector_t bio_issue_size(struct bio_issue *issue) 656{ 657 return ((issue->value & BIO_ISSUE_SIZE_MASK) >> BIO_ISSUE_SIZE_SHIFT); 658} 659 660static inline void bio_issue_init(struct bio_issue *issue, 661 sector_t size) 662{ 663 size &= (1ULL << BIO_ISSUE_SIZE_BITS) - 1; 664 issue->value = ((issue->value & BIO_ISSUE_RES_MASK) | 665 (blk_time_get_ns() & BIO_ISSUE_TIME_MASK) | 666 ((u64)size << BIO_ISSUE_SIZE_SHIFT)); 667} 668 669void bdev_release(struct file *bdev_file); 670int bdev_open(struct block_device *bdev, blk_mode_t mode, void *holder, 671 const struct blk_holder_ops *hops, struct file *bdev_file); 672int bdev_permission(dev_t dev, blk_mode_t mode, void *holder); 673 674#endif /* BLK_INTERNAL_H */ 675