1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_BLKDEV_H 3 #define _LINUX_BLKDEV_H 4 5 #include <linux/sched.h> 6 #include <linux/genhd.h> 7 #include <linux/list.h> 8 #include <linux/llist.h> 9 #include <linux/minmax.h> 10 #include <linux/timer.h> 11 #include <linux/workqueue.h> 12 #include <linux/wait.h> 13 #include <linux/bio.h> 14 #include <linux/gfp.h> 15 #include <linux/rcupdate.h> 16 #include <linux/percpu-refcount.h> 17 #include <linux/blkzoned.h> 18 #include <linux/sbitmap.h> 19 #include <linux/srcu.h> 20 21 struct module; 22 struct request_queue; 23 struct elevator_queue; 24 struct blk_trace; 25 struct request; 26 struct sg_io_hdr; 27 struct blkcg_gq; 28 struct blk_flush_queue; 29 struct kiocb; 30 struct pr_ops; 31 struct rq_qos; 32 struct blk_queue_stats; 33 struct blk_stat_callback; 34 struct blk_crypto_profile; 35 36 /* Must be consistent with blk_mq_poll_stats_bkt() */ 37 #define BLK_MQ_POLL_STATS_BKTS 16 38 39 /* Doing classic polling */ 40 #define BLK_MQ_POLL_CLASSIC -1 41 42 /* 43 * Maximum number of blkcg policies allowed to be registered concurrently. 44 * Defined here to simplify include dependency. 45 */ 46 #define BLKCG_MAX_POLS 6 47 48 static inline int blk_validate_block_size(unsigned long bsize) 49 { 50 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) 51 return -EINVAL; 52 53 return 0; 54 } 55 56 static inline bool blk_op_is_passthrough(unsigned int op) 57 { 58 op &= REQ_OP_MASK; 59 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 60 } 61 62 /* 63 * Zoned block device models (zoned limit). 64 * 65 * Note: This needs to be ordered from the least to the most severe 66 * restrictions for the inheritance in blk_stack_limits() to work. 67 */ 68 enum blk_zoned_model { 69 BLK_ZONED_NONE = 0, /* Regular block device */ 70 BLK_ZONED_HA, /* Host-aware zoned block device */ 71 BLK_ZONED_HM, /* Host-managed zoned block device */ 72 }; 73 74 /* 75 * BLK_BOUNCE_NONE: never bounce (default) 76 * BLK_BOUNCE_HIGH: bounce all highmem pages 77 */ 78 enum blk_bounce { 79 BLK_BOUNCE_NONE, 80 BLK_BOUNCE_HIGH, 81 }; 82 83 struct queue_limits { 84 enum blk_bounce bounce; 85 unsigned long seg_boundary_mask; 86 unsigned long virt_boundary_mask; 87 88 unsigned int max_hw_sectors; 89 unsigned int max_dev_sectors; 90 unsigned int chunk_sectors; 91 unsigned int max_sectors; 92 unsigned int max_segment_size; 93 unsigned int physical_block_size; 94 unsigned int logical_block_size; 95 unsigned int alignment_offset; 96 unsigned int io_min; 97 unsigned int io_opt; 98 unsigned int max_discard_sectors; 99 unsigned int max_hw_discard_sectors; 100 unsigned int max_write_same_sectors; 101 unsigned int max_write_zeroes_sectors; 102 unsigned int max_zone_append_sectors; 103 unsigned int discard_granularity; 104 unsigned int discard_alignment; 105 unsigned int zone_write_granularity; 106 107 unsigned short max_segments; 108 unsigned short max_integrity_segments; 109 unsigned short max_discard_segments; 110 111 unsigned char misaligned; 112 unsigned char discard_misaligned; 113 unsigned char raid_partial_stripes_expensive; 114 enum blk_zoned_model zoned; 115 }; 116 117 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 118 void *data); 119 120 void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); 121 122 #ifdef CONFIG_BLK_DEV_ZONED 123 124 #define BLK_ALL_ZONES ((unsigned int)-1) 125 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 126 unsigned int nr_zones, report_zones_cb cb, void *data); 127 unsigned int blkdev_nr_zones(struct gendisk *disk); 128 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, 129 sector_t sectors, sector_t nr_sectors, 130 gfp_t gfp_mask); 131 int blk_revalidate_disk_zones(struct gendisk *disk, 132 void (*update_driver_data)(struct gendisk *disk)); 133 134 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 135 unsigned int cmd, unsigned long arg); 136 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, 137 unsigned int cmd, unsigned long arg); 138 139 #else /* CONFIG_BLK_DEV_ZONED */ 140 141 static inline unsigned int blkdev_nr_zones(struct gendisk *disk) 142 { 143 return 0; 144 } 145 146 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 147 fmode_t mode, unsigned int cmd, 148 unsigned long arg) 149 { 150 return -ENOTTY; 151 } 152 153 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 154 fmode_t mode, unsigned int cmd, 155 unsigned long arg) 156 { 157 return -ENOTTY; 158 } 159 160 #endif /* CONFIG_BLK_DEV_ZONED */ 161 162 /* 163 * Independent access ranges: struct blk_independent_access_range describes 164 * a range of contiguous sectors that can be accessed using device command 165 * execution resources that are independent from the resources used for 166 * other access ranges. This is typically found with single-LUN multi-actuator 167 * HDDs where each access range is served by a different set of heads. 168 * The set of independent ranges supported by the device is defined using 169 * struct blk_independent_access_ranges. The independent ranges must not overlap 170 * and must include all sectors within the disk capacity (no sector holes 171 * allowed). 172 * For a device with multiple ranges, requests targeting sectors in different 173 * ranges can be executed in parallel. A request can straddle an access range 174 * boundary. 175 */ 176 struct blk_independent_access_range { 177 struct kobject kobj; 178 struct request_queue *queue; 179 sector_t sector; 180 sector_t nr_sectors; 181 }; 182 183 struct blk_independent_access_ranges { 184 struct kobject kobj; 185 bool sysfs_registered; 186 unsigned int nr_ia_ranges; 187 struct blk_independent_access_range ia_range[]; 188 }; 189 190 struct request_queue { 191 struct request *last_merge; 192 struct elevator_queue *elevator; 193 194 struct percpu_ref q_usage_counter; 195 196 struct blk_queue_stats *stats; 197 struct rq_qos *rq_qos; 198 199 const struct blk_mq_ops *mq_ops; 200 201 /* sw queues */ 202 struct blk_mq_ctx __percpu *queue_ctx; 203 204 unsigned int queue_depth; 205 206 /* hw dispatch queues */ 207 struct blk_mq_hw_ctx **queue_hw_ctx; 208 unsigned int nr_hw_queues; 209 210 /* 211 * The queue owner gets to use this for whatever they like. 212 * ll_rw_blk doesn't touch it. 213 */ 214 void *queuedata; 215 216 /* 217 * various queue flags, see QUEUE_* below 218 */ 219 unsigned long queue_flags; 220 /* 221 * Number of contexts that have called blk_set_pm_only(). If this 222 * counter is above zero then only RQF_PM requests are processed. 223 */ 224 atomic_t pm_only; 225 226 /* 227 * ida allocated id for this queue. Used to index queues from 228 * ioctx. 229 */ 230 int id; 231 232 spinlock_t queue_lock; 233 234 struct gendisk *disk; 235 236 /* 237 * queue kobject 238 */ 239 struct kobject kobj; 240 241 /* 242 * mq queue kobject 243 */ 244 struct kobject *mq_kobj; 245 246 #ifdef CONFIG_BLK_DEV_INTEGRITY 247 struct blk_integrity integrity; 248 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 249 250 #ifdef CONFIG_PM 251 struct device *dev; 252 enum rpm_status rpm_status; 253 #endif 254 255 /* 256 * queue settings 257 */ 258 unsigned long nr_requests; /* Max # of requests */ 259 260 unsigned int dma_pad_mask; 261 unsigned int dma_alignment; 262 263 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 264 struct blk_crypto_profile *crypto_profile; 265 #endif 266 267 unsigned int rq_timeout; 268 int poll_nsec; 269 270 struct blk_stat_callback *poll_cb; 271 struct blk_rq_stat *poll_stat; 272 273 struct timer_list timeout; 274 struct work_struct timeout_work; 275 276 atomic_t nr_active_requests_shared_tags; 277 278 struct blk_mq_tags *sched_shared_tags; 279 280 struct list_head icq_list; 281 #ifdef CONFIG_BLK_CGROUP 282 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 283 struct blkcg_gq *root_blkg; 284 struct list_head blkg_list; 285 #endif 286 287 struct queue_limits limits; 288 289 unsigned int required_elevator_features; 290 291 #ifdef CONFIG_BLK_DEV_ZONED 292 /* 293 * Zoned block device information for request dispatch control. 294 * nr_zones is the total number of zones of the device. This is always 295 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 296 * bits which indicates if a zone is conventional (bit set) or 297 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 298 * bits which indicates if a zone is write locked, that is, if a write 299 * request targeting the zone was dispatched. All three fields are 300 * initialized by the low level device driver (e.g. scsi/sd.c). 301 * Stacking drivers (device mappers) may or may not initialize 302 * these fields. 303 * 304 * Reads of this information must be protected with blk_queue_enter() / 305 * blk_queue_exit(). Modifying this information is only allowed while 306 * no requests are being processed. See also blk_mq_freeze_queue() and 307 * blk_mq_unfreeze_queue(). 308 */ 309 unsigned int nr_zones; 310 unsigned long *conv_zones_bitmap; 311 unsigned long *seq_zones_wlock; 312 unsigned int max_open_zones; 313 unsigned int max_active_zones; 314 #endif /* CONFIG_BLK_DEV_ZONED */ 315 316 int node; 317 struct mutex debugfs_mutex; 318 #ifdef CONFIG_BLK_DEV_IO_TRACE 319 struct blk_trace __rcu *blk_trace; 320 #endif 321 /* 322 * for flush operations 323 */ 324 struct blk_flush_queue *fq; 325 326 struct list_head requeue_list; 327 spinlock_t requeue_lock; 328 struct delayed_work requeue_work; 329 330 struct mutex sysfs_lock; 331 struct mutex sysfs_dir_lock; 332 333 /* 334 * for reusing dead hctx instance in case of updating 335 * nr_hw_queues 336 */ 337 struct list_head unused_hctx_list; 338 spinlock_t unused_hctx_lock; 339 340 int mq_freeze_depth; 341 342 #ifdef CONFIG_BLK_DEV_THROTTLING 343 /* Throttle data */ 344 struct throtl_data *td; 345 #endif 346 struct rcu_head rcu_head; 347 wait_queue_head_t mq_freeze_wq; 348 /* 349 * Protect concurrent access to q_usage_counter by 350 * percpu_ref_kill() and percpu_ref_reinit(). 351 */ 352 struct mutex mq_freeze_lock; 353 354 int quiesce_depth; 355 356 struct blk_mq_tag_set *tag_set; 357 struct list_head tag_set_list; 358 struct bio_set bio_split; 359 360 struct dentry *debugfs_dir; 361 362 #ifdef CONFIG_BLK_DEBUG_FS 363 struct dentry *sched_debugfs_dir; 364 struct dentry *rqos_debugfs_dir; 365 #endif 366 367 bool mq_sysfs_init_done; 368 369 #define BLK_MAX_WRITE_HINTS 5 370 u64 write_hints[BLK_MAX_WRITE_HINTS]; 371 372 /* 373 * Independent sector access ranges. This is always NULL for 374 * devices that do not have multiple independent access ranges. 375 */ 376 struct blk_independent_access_ranges *ia_ranges; 377 378 /** 379 * @srcu: Sleepable RCU. Use as lock when type of the request queue 380 * is blocking (BLK_MQ_F_BLOCKING). Must be the last member 381 */ 382 struct srcu_struct srcu[]; 383 }; 384 385 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 386 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 387 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 388 #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */ 389 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 390 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 391 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 392 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 393 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 394 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 395 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ 396 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 397 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 398 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ 399 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 400 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 401 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 402 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 403 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 404 #define QUEUE_FLAG_WC 17 /* Write back caching */ 405 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 406 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 407 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 408 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 409 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 410 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 411 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 412 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 413 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 414 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 415 416 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 417 (1 << QUEUE_FLAG_SAME_COMP) | \ 418 (1 << QUEUE_FLAG_NOWAIT)) 419 420 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 421 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 422 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 423 424 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 425 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 426 #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags) 427 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 428 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 429 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 430 #define blk_queue_noxmerges(q) \ 431 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 432 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 433 #define blk_queue_stable_writes(q) \ 434 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 435 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 436 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 437 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 438 #define blk_queue_zone_resetall(q) \ 439 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 440 #define blk_queue_secure_erase(q) \ 441 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 442 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 443 #define blk_queue_pci_p2pdma(q) \ 444 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 445 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 446 #define blk_queue_rq_alloc_time(q) \ 447 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 448 #else 449 #define blk_queue_rq_alloc_time(q) false 450 #endif 451 452 #define blk_noretry_request(rq) \ 453 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 454 REQ_FAILFAST_DRIVER)) 455 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 456 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 457 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 458 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 459 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) 460 461 extern void blk_set_pm_only(struct request_queue *q); 462 extern void blk_clear_pm_only(struct request_queue *q); 463 464 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 465 466 #define dma_map_bvec(dev, bv, dir, attrs) \ 467 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 468 (dir), (attrs)) 469 470 static inline bool queue_is_mq(struct request_queue *q) 471 { 472 return q->mq_ops; 473 } 474 475 #ifdef CONFIG_PM 476 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 477 { 478 return q->rpm_status; 479 } 480 #else 481 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 482 { 483 return RPM_ACTIVE; 484 } 485 #endif 486 487 static inline enum blk_zoned_model 488 blk_queue_zoned_model(struct request_queue *q) 489 { 490 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) 491 return q->limits.zoned; 492 return BLK_ZONED_NONE; 493 } 494 495 static inline bool blk_queue_is_zoned(struct request_queue *q) 496 { 497 switch (blk_queue_zoned_model(q)) { 498 case BLK_ZONED_HA: 499 case BLK_ZONED_HM: 500 return true; 501 default: 502 return false; 503 } 504 } 505 506 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 507 { 508 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 509 } 510 511 #ifdef CONFIG_BLK_DEV_ZONED 512 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 513 { 514 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 515 } 516 517 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 518 sector_t sector) 519 { 520 if (!blk_queue_is_zoned(q)) 521 return 0; 522 return sector >> ilog2(q->limits.chunk_sectors); 523 } 524 525 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 526 sector_t sector) 527 { 528 if (!blk_queue_is_zoned(q)) 529 return false; 530 if (!q->conv_zones_bitmap) 531 return true; 532 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 533 } 534 535 static inline void blk_queue_max_open_zones(struct request_queue *q, 536 unsigned int max_open_zones) 537 { 538 q->max_open_zones = max_open_zones; 539 } 540 541 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 542 { 543 return q->max_open_zones; 544 } 545 546 static inline void blk_queue_max_active_zones(struct request_queue *q, 547 unsigned int max_active_zones) 548 { 549 q->max_active_zones = max_active_zones; 550 } 551 552 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 553 { 554 return q->max_active_zones; 555 } 556 #else /* CONFIG_BLK_DEV_ZONED */ 557 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 558 { 559 return 0; 560 } 561 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 562 sector_t sector) 563 { 564 return false; 565 } 566 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 567 sector_t sector) 568 { 569 return 0; 570 } 571 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 572 { 573 return 0; 574 } 575 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 576 { 577 return 0; 578 } 579 #endif /* CONFIG_BLK_DEV_ZONED */ 580 581 static inline unsigned int blk_queue_depth(struct request_queue *q) 582 { 583 if (q->queue_depth) 584 return q->queue_depth; 585 586 return q->nr_requests; 587 } 588 589 /* 590 * default timeout for SG_IO if none specified 591 */ 592 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 593 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 594 595 /* This should not be used directly - use rq_for_each_segment */ 596 #define for_each_bio(_bio) \ 597 for (; _bio; _bio = _bio->bi_next) 598 599 600 extern int blk_register_queue(struct gendisk *disk); 601 extern void blk_unregister_queue(struct gendisk *disk); 602 void submit_bio_noacct(struct bio *bio); 603 604 extern int blk_lld_busy(struct request_queue *q); 605 extern void blk_queue_split(struct bio **); 606 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 607 extern void blk_queue_exit(struct request_queue *q); 608 extern void blk_sync_queue(struct request_queue *q); 609 610 /* Helper to convert REQ_OP_XXX to its string format XXX */ 611 extern const char *blk_op_str(unsigned int op); 612 613 int blk_status_to_errno(blk_status_t status); 614 blk_status_t errno_to_blk_status(int errno); 615 616 /* only poll the hardware once, don't continue until a completion was found */ 617 #define BLK_POLL_ONESHOT (1 << 0) 618 /* do not sleep to wait for the expected completion time */ 619 #define BLK_POLL_NOSLEEP (1 << 1) 620 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); 621 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, 622 unsigned int flags); 623 624 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 625 { 626 return bdev->bd_queue; /* this is never NULL */ 627 } 628 629 #ifdef CONFIG_BLK_DEV_ZONED 630 631 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 632 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 633 634 static inline unsigned int bio_zone_no(struct bio *bio) 635 { 636 return blk_queue_zone_no(bdev_get_queue(bio->bi_bdev), 637 bio->bi_iter.bi_sector); 638 } 639 640 static inline unsigned int bio_zone_is_seq(struct bio *bio) 641 { 642 return blk_queue_zone_is_seq(bdev_get_queue(bio->bi_bdev), 643 bio->bi_iter.bi_sector); 644 } 645 #endif /* CONFIG_BLK_DEV_ZONED */ 646 647 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 648 int op) 649 { 650 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 651 return min(q->limits.max_discard_sectors, 652 UINT_MAX >> SECTOR_SHIFT); 653 654 if (unlikely(op == REQ_OP_WRITE_SAME)) 655 return q->limits.max_write_same_sectors; 656 657 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 658 return q->limits.max_write_zeroes_sectors; 659 660 return q->limits.max_sectors; 661 } 662 663 /* 664 * Return maximum size of a request at given offset. Only valid for 665 * file system requests. 666 */ 667 static inline unsigned int blk_max_size_offset(struct request_queue *q, 668 sector_t offset, 669 unsigned int chunk_sectors) 670 { 671 if (!chunk_sectors) { 672 if (q->limits.chunk_sectors) 673 chunk_sectors = q->limits.chunk_sectors; 674 else 675 return q->limits.max_sectors; 676 } 677 678 if (likely(is_power_of_2(chunk_sectors))) 679 chunk_sectors -= offset & (chunk_sectors - 1); 680 else 681 chunk_sectors -= sector_div(offset, chunk_sectors); 682 683 return min(q->limits.max_sectors, chunk_sectors); 684 } 685 686 /* 687 * Access functions for manipulating queue properties 688 */ 689 extern void blk_cleanup_queue(struct request_queue *); 690 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit); 691 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 692 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 693 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 694 extern void blk_queue_max_discard_segments(struct request_queue *, 695 unsigned short); 696 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 697 extern void blk_queue_max_discard_sectors(struct request_queue *q, 698 unsigned int max_discard_sectors); 699 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 700 unsigned int max_write_same_sectors); 701 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 702 unsigned int max_write_same_sectors); 703 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 704 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 705 unsigned int max_zone_append_sectors); 706 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 707 void blk_queue_zone_write_granularity(struct request_queue *q, 708 unsigned int size); 709 extern void blk_queue_alignment_offset(struct request_queue *q, 710 unsigned int alignment); 711 void disk_update_readahead(struct gendisk *disk); 712 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 713 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 714 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 715 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 716 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 717 extern void blk_set_default_limits(struct queue_limits *lim); 718 extern void blk_set_stacking_limits(struct queue_limits *lim); 719 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 720 sector_t offset); 721 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 722 sector_t offset); 723 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 724 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 725 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 726 extern void blk_queue_dma_alignment(struct request_queue *, int); 727 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 728 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 729 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 730 731 struct blk_independent_access_ranges * 732 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); 733 void disk_set_independent_access_ranges(struct gendisk *disk, 734 struct blk_independent_access_ranges *iars); 735 736 /* 737 * Elevator features for blk_queue_required_elevator_features: 738 */ 739 /* Supports zoned block devices sequential write constraint */ 740 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0) 741 /* Supports scheduling on multiple hardware queues */ 742 #define ELEVATOR_F_MQ_AWARE (1U << 1) 743 744 extern void blk_queue_required_elevator_features(struct request_queue *q, 745 unsigned int features); 746 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 747 struct device *dev); 748 749 bool __must_check blk_get_queue(struct request_queue *); 750 extern void blk_put_queue(struct request_queue *); 751 752 void blk_mark_disk_dead(struct gendisk *disk); 753 754 #ifdef CONFIG_BLOCK 755 /* 756 * blk_plug permits building a queue of related requests by holding the I/O 757 * fragments for a short period. This allows merging of sequential requests 758 * into single larger request. As the requests are moved from a per-task list to 759 * the device's request_queue in a batch, this results in improved scalability 760 * as the lock contention for request_queue lock is reduced. 761 * 762 * It is ok not to disable preemption when adding the request to the plug list 763 * or when attempting a merge. For details, please see schedule() where 764 * blk_flush_plug() is called. 765 */ 766 struct blk_plug { 767 struct request *mq_list; /* blk-mq requests */ 768 769 /* if ios_left is > 1, we can batch tag/rq allocations */ 770 struct request *cached_rq; 771 unsigned short nr_ios; 772 773 unsigned short rq_count; 774 775 bool multiple_queues; 776 bool has_elevator; 777 bool nowait; 778 779 struct list_head cb_list; /* md requires an unplug callback */ 780 }; 781 782 struct blk_plug_cb; 783 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 784 struct blk_plug_cb { 785 struct list_head list; 786 blk_plug_cb_fn callback; 787 void *data; 788 }; 789 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 790 void *data, int size); 791 extern void blk_start_plug(struct blk_plug *); 792 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); 793 extern void blk_finish_plug(struct blk_plug *); 794 795 void blk_flush_plug(struct blk_plug *plug, bool from_schedule); 796 797 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 798 { 799 struct blk_plug *plug = tsk->plug; 800 801 return plug && 802 (plug->mq_list || !list_empty(&plug->cb_list)); 803 } 804 805 int blkdev_issue_flush(struct block_device *bdev); 806 long nr_blockdev_pages(void); 807 #else /* CONFIG_BLOCK */ 808 struct blk_plug { 809 }; 810 811 static inline void blk_start_plug_nr_ios(struct blk_plug *plug, 812 unsigned short nr_ios) 813 { 814 } 815 816 static inline void blk_start_plug(struct blk_plug *plug) 817 { 818 } 819 820 static inline void blk_finish_plug(struct blk_plug *plug) 821 { 822 } 823 824 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 825 { 826 } 827 828 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 829 { 830 return false; 831 } 832 833 static inline int blkdev_issue_flush(struct block_device *bdev) 834 { 835 return 0; 836 } 837 838 static inline long nr_blockdev_pages(void) 839 { 840 return 0; 841 } 842 #endif /* CONFIG_BLOCK */ 843 844 extern void blk_io_schedule(void); 845 846 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 847 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 848 849 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 850 851 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 852 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 853 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 854 sector_t nr_sects, gfp_t gfp_mask, int flags, 855 struct bio **biop); 856 857 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 858 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 859 860 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 861 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 862 unsigned flags); 863 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 864 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 865 866 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 867 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 868 { 869 return blkdev_issue_discard(sb->s_bdev, 870 block << (sb->s_blocksize_bits - 871 SECTOR_SHIFT), 872 nr_blocks << (sb->s_blocksize_bits - 873 SECTOR_SHIFT), 874 gfp_mask, flags); 875 } 876 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 877 sector_t nr_blocks, gfp_t gfp_mask) 878 { 879 return blkdev_issue_zeroout(sb->s_bdev, 880 block << (sb->s_blocksize_bits - 881 SECTOR_SHIFT), 882 nr_blocks << (sb->s_blocksize_bits - 883 SECTOR_SHIFT), 884 gfp_mask, 0); 885 } 886 887 static inline bool bdev_is_partition(struct block_device *bdev) 888 { 889 return bdev->bd_partno; 890 } 891 892 enum blk_default_limits { 893 BLK_MAX_SEGMENTS = 128, 894 BLK_SAFE_MAX_SECTORS = 255, 895 BLK_DEF_MAX_SECTORS = 2560, 896 BLK_MAX_SEGMENT_SIZE = 65536, 897 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 898 }; 899 900 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 901 { 902 return q->limits.seg_boundary_mask; 903 } 904 905 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 906 { 907 return q->limits.virt_boundary_mask; 908 } 909 910 static inline unsigned int queue_max_sectors(const struct request_queue *q) 911 { 912 return q->limits.max_sectors; 913 } 914 915 static inline unsigned int queue_max_bytes(struct request_queue *q) 916 { 917 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9; 918 } 919 920 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 921 { 922 return q->limits.max_hw_sectors; 923 } 924 925 static inline unsigned short queue_max_segments(const struct request_queue *q) 926 { 927 return q->limits.max_segments; 928 } 929 930 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 931 { 932 return q->limits.max_discard_segments; 933 } 934 935 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 936 { 937 return q->limits.max_segment_size; 938 } 939 940 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 941 { 942 943 const struct queue_limits *l = &q->limits; 944 945 return min(l->max_zone_append_sectors, l->max_sectors); 946 } 947 948 static inline unsigned queue_logical_block_size(const struct request_queue *q) 949 { 950 int retval = 512; 951 952 if (q && q->limits.logical_block_size) 953 retval = q->limits.logical_block_size; 954 955 return retval; 956 } 957 958 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 959 { 960 return queue_logical_block_size(bdev_get_queue(bdev)); 961 } 962 963 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 964 { 965 return q->limits.physical_block_size; 966 } 967 968 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 969 { 970 return queue_physical_block_size(bdev_get_queue(bdev)); 971 } 972 973 static inline unsigned int queue_io_min(const struct request_queue *q) 974 { 975 return q->limits.io_min; 976 } 977 978 static inline int bdev_io_min(struct block_device *bdev) 979 { 980 return queue_io_min(bdev_get_queue(bdev)); 981 } 982 983 static inline unsigned int queue_io_opt(const struct request_queue *q) 984 { 985 return q->limits.io_opt; 986 } 987 988 static inline int bdev_io_opt(struct block_device *bdev) 989 { 990 return queue_io_opt(bdev_get_queue(bdev)); 991 } 992 993 static inline unsigned int 994 queue_zone_write_granularity(const struct request_queue *q) 995 { 996 return q->limits.zone_write_granularity; 997 } 998 999 static inline unsigned int 1000 bdev_zone_write_granularity(struct block_device *bdev) 1001 { 1002 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1003 } 1004 1005 static inline int queue_alignment_offset(const struct request_queue *q) 1006 { 1007 if (q->limits.misaligned) 1008 return -1; 1009 1010 return q->limits.alignment_offset; 1011 } 1012 1013 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1014 { 1015 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1016 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1017 << SECTOR_SHIFT; 1018 1019 return (granularity + lim->alignment_offset - alignment) % granularity; 1020 } 1021 1022 static inline int bdev_alignment_offset(struct block_device *bdev) 1023 { 1024 struct request_queue *q = bdev_get_queue(bdev); 1025 1026 if (q->limits.misaligned) 1027 return -1; 1028 if (bdev_is_partition(bdev)) 1029 return queue_limit_alignment_offset(&q->limits, 1030 bdev->bd_start_sect); 1031 return q->limits.alignment_offset; 1032 } 1033 1034 static inline int queue_discard_alignment(const struct request_queue *q) 1035 { 1036 if (q->limits.discard_misaligned) 1037 return -1; 1038 1039 return q->limits.discard_alignment; 1040 } 1041 1042 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1043 { 1044 unsigned int alignment, granularity, offset; 1045 1046 if (!lim->max_discard_sectors) 1047 return 0; 1048 1049 /* Why are these in bytes, not sectors? */ 1050 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1051 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1052 if (!granularity) 1053 return 0; 1054 1055 /* Offset of the partition start in 'granularity' sectors */ 1056 offset = sector_div(sector, granularity); 1057 1058 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1059 offset = (granularity + alignment - offset) % granularity; 1060 1061 /* Turn it back into bytes, gaah */ 1062 return offset << SECTOR_SHIFT; 1063 } 1064 1065 static inline int bdev_discard_alignment(struct block_device *bdev) 1066 { 1067 struct request_queue *q = bdev_get_queue(bdev); 1068 1069 if (bdev_is_partition(bdev)) 1070 return queue_limit_discard_alignment(&q->limits, 1071 bdev->bd_start_sect); 1072 return q->limits.discard_alignment; 1073 } 1074 1075 static inline unsigned int bdev_write_same(struct block_device *bdev) 1076 { 1077 struct request_queue *q = bdev_get_queue(bdev); 1078 1079 if (q) 1080 return q->limits.max_write_same_sectors; 1081 1082 return 0; 1083 } 1084 1085 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1086 { 1087 struct request_queue *q = bdev_get_queue(bdev); 1088 1089 if (q) 1090 return q->limits.max_write_zeroes_sectors; 1091 1092 return 0; 1093 } 1094 1095 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1096 { 1097 struct request_queue *q = bdev_get_queue(bdev); 1098 1099 if (q) 1100 return blk_queue_zoned_model(q); 1101 1102 return BLK_ZONED_NONE; 1103 } 1104 1105 static inline bool bdev_is_zoned(struct block_device *bdev) 1106 { 1107 struct request_queue *q = bdev_get_queue(bdev); 1108 1109 if (q) 1110 return blk_queue_is_zoned(q); 1111 1112 return false; 1113 } 1114 1115 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1116 { 1117 struct request_queue *q = bdev_get_queue(bdev); 1118 1119 if (q) 1120 return blk_queue_zone_sectors(q); 1121 return 0; 1122 } 1123 1124 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1125 { 1126 struct request_queue *q = bdev_get_queue(bdev); 1127 1128 if (q) 1129 return queue_max_open_zones(q); 1130 return 0; 1131 } 1132 1133 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1134 { 1135 struct request_queue *q = bdev_get_queue(bdev); 1136 1137 if (q) 1138 return queue_max_active_zones(q); 1139 return 0; 1140 } 1141 1142 static inline int queue_dma_alignment(const struct request_queue *q) 1143 { 1144 return q ? q->dma_alignment : 511; 1145 } 1146 1147 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1148 unsigned int len) 1149 { 1150 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1151 return !(addr & alignment) && !(len & alignment); 1152 } 1153 1154 /* assumes size > 256 */ 1155 static inline unsigned int blksize_bits(unsigned int size) 1156 { 1157 unsigned int bits = 8; 1158 do { 1159 bits++; 1160 size >>= 1; 1161 } while (size > 256); 1162 return bits; 1163 } 1164 1165 static inline unsigned int block_size(struct block_device *bdev) 1166 { 1167 return 1 << bdev->bd_inode->i_blkbits; 1168 } 1169 1170 int kblockd_schedule_work(struct work_struct *work); 1171 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1172 1173 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1174 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1175 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1176 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1177 1178 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1179 1180 bool blk_crypto_register(struct blk_crypto_profile *profile, 1181 struct request_queue *q); 1182 1183 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1184 1185 static inline bool blk_crypto_register(struct blk_crypto_profile *profile, 1186 struct request_queue *q) 1187 { 1188 return true; 1189 } 1190 1191 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1192 1193 enum blk_unique_id { 1194 /* these match the Designator Types specified in SPC */ 1195 BLK_UID_T10 = 1, 1196 BLK_UID_EUI64 = 2, 1197 BLK_UID_NAA = 3, 1198 }; 1199 1200 #define NFL4_UFLG_MASK 0x0000003F 1201 1202 struct block_device_operations { 1203 void (*submit_bio)(struct bio *bio); 1204 int (*open) (struct block_device *, fmode_t); 1205 void (*release) (struct gendisk *, fmode_t); 1206 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1207 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1208 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1209 unsigned int (*check_events) (struct gendisk *disk, 1210 unsigned int clearing); 1211 void (*unlock_native_capacity) (struct gendisk *); 1212 int (*getgeo)(struct block_device *, struct hd_geometry *); 1213 int (*set_read_only)(struct block_device *bdev, bool ro); 1214 /* this callback is with swap_lock and sometimes page table lock held */ 1215 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1216 int (*report_zones)(struct gendisk *, sector_t sector, 1217 unsigned int nr_zones, report_zones_cb cb, void *data); 1218 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1219 /* returns the length of the identifier or a negative errno: */ 1220 int (*get_unique_id)(struct gendisk *disk, u8 id[16], 1221 enum blk_unique_id id_type); 1222 struct module *owner; 1223 const struct pr_ops *pr_ops; 1224 1225 /* 1226 * Special callback for probing GPT entry at a given sector. 1227 * Needed by Android devices, used by GPT scanner and MMC blk 1228 * driver. 1229 */ 1230 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector); 1231 }; 1232 1233 #ifdef CONFIG_COMPAT 1234 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1235 unsigned int, unsigned long); 1236 #else 1237 #define blkdev_compat_ptr_ioctl NULL 1238 #endif 1239 1240 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1241 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1242 struct writeback_control *); 1243 1244 static inline void blk_wake_io_task(struct task_struct *waiter) 1245 { 1246 /* 1247 * If we're polling, the task itself is doing the completions. For 1248 * that case, we don't need to signal a wakeup, it's enough to just 1249 * mark us as RUNNING. 1250 */ 1251 if (waiter == current) 1252 __set_current_state(TASK_RUNNING); 1253 else 1254 wake_up_process(waiter); 1255 } 1256 1257 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1258 unsigned int op); 1259 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1260 unsigned long start_time); 1261 1262 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time); 1263 unsigned long bio_start_io_acct(struct bio *bio); 1264 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1265 struct block_device *orig_bdev); 1266 1267 /** 1268 * bio_end_io_acct - end I/O accounting for bio based drivers 1269 * @bio: bio to end account for 1270 * @start: start time returned by bio_start_io_acct() 1271 */ 1272 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1273 { 1274 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1275 } 1276 1277 int bdev_read_only(struct block_device *bdev); 1278 int set_blocksize(struct block_device *bdev, int size); 1279 1280 const char *bdevname(struct block_device *bdev, char *buffer); 1281 int lookup_bdev(const char *pathname, dev_t *dev); 1282 1283 void blkdev_show(struct seq_file *seqf, off_t offset); 1284 1285 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1286 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1287 #ifdef CONFIG_BLOCK 1288 #define BLKDEV_MAJOR_MAX 512 1289 #else 1290 #define BLKDEV_MAJOR_MAX 0 1291 #endif 1292 1293 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 1294 void *holder); 1295 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 1296 int bd_prepare_to_claim(struct block_device *bdev, void *holder); 1297 void bd_abort_claiming(struct block_device *bdev, void *holder); 1298 void blkdev_put(struct block_device *bdev, fmode_t mode); 1299 1300 /* just for blk-cgroup, don't use elsewhere */ 1301 struct block_device *blkdev_get_no_open(dev_t dev); 1302 void blkdev_put_no_open(struct block_device *bdev); 1303 1304 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 1305 void bdev_add(struct block_device *bdev, dev_t dev); 1306 struct block_device *I_BDEV(struct inode *inode); 1307 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 1308 loff_t lend); 1309 1310 #ifdef CONFIG_BLOCK 1311 void invalidate_bdev(struct block_device *bdev); 1312 int sync_blockdev(struct block_device *bdev); 1313 int sync_blockdev_nowait(struct block_device *bdev); 1314 void sync_bdevs(bool wait); 1315 #else 1316 static inline void invalidate_bdev(struct block_device *bdev) 1317 { 1318 } 1319 static inline int sync_blockdev(struct block_device *bdev) 1320 { 1321 return 0; 1322 } 1323 static inline int sync_blockdev_nowait(struct block_device *bdev) 1324 { 1325 return 0; 1326 } 1327 static inline void sync_bdevs(bool wait) 1328 { 1329 } 1330 #endif 1331 int fsync_bdev(struct block_device *bdev); 1332 1333 int freeze_bdev(struct block_device *bdev); 1334 int thaw_bdev(struct block_device *bdev); 1335 1336 struct io_comp_batch { 1337 struct request *req_list; 1338 bool need_ts; 1339 void (*complete)(struct io_comp_batch *); 1340 }; 1341 1342 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } 1343 1344 #endif /* _LINUX_BLKDEV_H */ 1345