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/sched/clock.h> 7 8 #ifdef CONFIG_BLOCK 9 10 #include <linux/major.h> 11 #include <linux/genhd.h> 12 #include <linux/list.h> 13 #include <linux/llist.h> 14 #include <linux/timer.h> 15 #include <linux/workqueue.h> 16 #include <linux/pagemap.h> 17 #include <linux/backing-dev-defs.h> 18 #include <linux/wait.h> 19 #include <linux/mempool.h> 20 #include <linux/pfn.h> 21 #include <linux/bio.h> 22 #include <linux/stringify.h> 23 #include <linux/gfp.h> 24 #include <linux/bsg.h> 25 #include <linux/smp.h> 26 #include <linux/rcupdate.h> 27 #include <linux/percpu-refcount.h> 28 #include <linux/scatterlist.h> 29 #include <linux/blkzoned.h> 30 31 struct module; 32 struct scsi_ioctl_command; 33 34 struct request_queue; 35 struct elevator_queue; 36 struct blk_trace; 37 struct request; 38 struct sg_io_hdr; 39 struct bsg_job; 40 struct blkcg_gq; 41 struct blk_flush_queue; 42 struct pr_ops; 43 struct rq_qos; 44 struct blk_queue_stats; 45 struct blk_stat_callback; 46 47 #define BLKDEV_MIN_RQ 4 48 #define BLKDEV_MAX_RQ 128 /* Default maximum */ 49 50 /* Must be consistent with blk_mq_poll_stats_bkt() */ 51 #define BLK_MQ_POLL_STATS_BKTS 16 52 53 /* 54 * Maximum number of blkcg policies allowed to be registered concurrently. 55 * Defined here to simplify include dependency. 56 */ 57 #define BLKCG_MAX_POLS 5 58 59 typedef void (rq_end_io_fn)(struct request *, blk_status_t); 60 61 #define BLK_RL_SYNCFULL (1U << 0) 62 #define BLK_RL_ASYNCFULL (1U << 1) 63 64 struct request_list { 65 struct request_queue *q; /* the queue this rl belongs to */ 66 #ifdef CONFIG_BLK_CGROUP 67 struct blkcg_gq *blkg; /* blkg this request pool belongs to */ 68 #endif 69 /* 70 * count[], starved[], and wait[] are indexed by 71 * BLK_RW_SYNC/BLK_RW_ASYNC 72 */ 73 int count[2]; 74 int starved[2]; 75 mempool_t *rq_pool; 76 wait_queue_head_t wait[2]; 77 unsigned int flags; 78 }; 79 80 /* 81 * request flags */ 82 typedef __u32 __bitwise req_flags_t; 83 84 /* elevator knows about this request */ 85 #define RQF_SORTED ((__force req_flags_t)(1 << 0)) 86 /* drive already may have started this one */ 87 #define RQF_STARTED ((__force req_flags_t)(1 << 1)) 88 /* uses tagged queueing */ 89 #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) 90 /* may not be passed by ioscheduler */ 91 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) 92 /* request for flush sequence */ 93 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) 94 /* merge of different types, fail separately */ 95 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) 96 /* track inflight for MQ */ 97 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) 98 /* don't call prep for this one */ 99 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) 100 /* set for "ide_preempt" requests and also for requests for which the SCSI 101 "quiesce" state must be ignored. */ 102 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) 103 /* contains copies of user pages */ 104 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) 105 /* vaguely specified driver internal error. Ignored by the block layer */ 106 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 107 /* don't warn about errors */ 108 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 109 /* elevator private data attached */ 110 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 111 /* account into disk and partition IO statistics */ 112 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 113 /* request came from our alloc pool */ 114 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) 115 /* runtime pm request */ 116 #define RQF_PM ((__force req_flags_t)(1 << 15)) 117 /* on IO scheduler merge hash */ 118 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 119 /* track IO completion time */ 120 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 121 /* Look at ->special_vec for the actual data payload instead of the 122 bio chain. */ 123 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 124 /* The per-zone write lock is held for this request */ 125 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 126 /* already slept for hybrid poll */ 127 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 128 /* ->timeout has been called, don't expire again */ 129 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 130 131 /* flags that prevent us from merging requests: */ 132 #define RQF_NOMERGE_FLAGS \ 133 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 134 135 /* 136 * Request state for blk-mq. 137 */ 138 enum mq_rq_state { 139 MQ_RQ_IDLE = 0, 140 MQ_RQ_IN_FLIGHT = 1, 141 MQ_RQ_COMPLETE = 2, 142 }; 143 144 /* 145 * Try to put the fields that are referenced together in the same cacheline. 146 * 147 * If you modify this structure, make sure to update blk_rq_init() and 148 * especially blk_mq_rq_ctx_init() to take care of the added fields. 149 */ 150 struct request { 151 struct request_queue *q; 152 struct blk_mq_ctx *mq_ctx; 153 154 int cpu; 155 unsigned int cmd_flags; /* op and common flags */ 156 req_flags_t rq_flags; 157 158 int internal_tag; 159 160 /* the following two fields are internal, NEVER access directly */ 161 unsigned int __data_len; /* total data len */ 162 int tag; 163 sector_t __sector; /* sector cursor */ 164 165 struct bio *bio; 166 struct bio *biotail; 167 168 struct list_head queuelist; 169 170 /* 171 * The hash is used inside the scheduler, and killed once the 172 * request reaches the dispatch list. The ipi_list is only used 173 * to queue the request for softirq completion, which is long 174 * after the request has been unhashed (and even removed from 175 * the dispatch list). 176 */ 177 union { 178 struct hlist_node hash; /* merge hash */ 179 struct list_head ipi_list; 180 }; 181 182 /* 183 * The rb_node is only used inside the io scheduler, requests 184 * are pruned when moved to the dispatch queue. So let the 185 * completion_data share space with the rb_node. 186 */ 187 union { 188 struct rb_node rb_node; /* sort/lookup */ 189 struct bio_vec special_vec; 190 void *completion_data; 191 int error_count; /* for legacy drivers, don't use */ 192 }; 193 194 /* 195 * Three pointers are available for the IO schedulers, if they need 196 * more they have to dynamically allocate it. Flush requests are 197 * never put on the IO scheduler. So let the flush fields share 198 * space with the elevator data. 199 */ 200 union { 201 struct { 202 struct io_cq *icq; 203 void *priv[2]; 204 } elv; 205 206 struct { 207 unsigned int seq; 208 struct list_head list; 209 rq_end_io_fn *saved_end_io; 210 } flush; 211 }; 212 213 struct gendisk *rq_disk; 214 struct hd_struct *part; 215 /* Time that I/O was submitted to the kernel. */ 216 u64 start_time_ns; 217 /* Time that I/O was submitted to the device. */ 218 u64 io_start_time_ns; 219 220 #ifdef CONFIG_BLK_WBT 221 unsigned short wbt_flags; 222 #endif 223 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW 224 unsigned short throtl_size; 225 #endif 226 227 /* 228 * Number of scatter-gather DMA addr+len pairs after 229 * physical address coalescing is performed. 230 */ 231 unsigned short nr_phys_segments; 232 233 #if defined(CONFIG_BLK_DEV_INTEGRITY) 234 unsigned short nr_integrity_segments; 235 #endif 236 237 unsigned short write_hint; 238 unsigned short ioprio; 239 240 void *special; /* opaque pointer available for LLD use */ 241 242 unsigned int extra_len; /* length of alignment and padding */ 243 244 enum mq_rq_state state; 245 refcount_t ref; 246 247 unsigned int timeout; 248 249 /* access through blk_rq_set_deadline, blk_rq_deadline */ 250 unsigned long __deadline; 251 252 struct list_head timeout_list; 253 254 union { 255 struct __call_single_data csd; 256 u64 fifo_time; 257 }; 258 259 /* 260 * completion callback. 261 */ 262 rq_end_io_fn *end_io; 263 void *end_io_data; 264 265 /* for bidi */ 266 struct request *next_rq; 267 268 #ifdef CONFIG_BLK_CGROUP 269 struct request_list *rl; /* rl this rq is alloced from */ 270 #endif 271 }; 272 273 static inline bool blk_op_is_scsi(unsigned int op) 274 { 275 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 276 } 277 278 static inline bool blk_op_is_private(unsigned int op) 279 { 280 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 281 } 282 283 static inline bool blk_rq_is_scsi(struct request *rq) 284 { 285 return blk_op_is_scsi(req_op(rq)); 286 } 287 288 static inline bool blk_rq_is_private(struct request *rq) 289 { 290 return blk_op_is_private(req_op(rq)); 291 } 292 293 static inline bool blk_rq_is_passthrough(struct request *rq) 294 { 295 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 296 } 297 298 static inline bool bio_is_passthrough(struct bio *bio) 299 { 300 unsigned op = bio_op(bio); 301 302 return blk_op_is_scsi(op) || blk_op_is_private(op); 303 } 304 305 static inline unsigned short req_get_ioprio(struct request *req) 306 { 307 return req->ioprio; 308 } 309 310 #include <linux/elevator.h> 311 312 struct blk_queue_ctx; 313 314 typedef void (request_fn_proc) (struct request_queue *q); 315 typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); 316 typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); 317 typedef int (prep_rq_fn) (struct request_queue *, struct request *); 318 typedef void (unprep_rq_fn) (struct request_queue *, struct request *); 319 320 struct bio_vec; 321 typedef void (softirq_done_fn)(struct request *); 322 typedef int (dma_drain_needed_fn)(struct request *); 323 typedef int (lld_busy_fn) (struct request_queue *q); 324 typedef int (bsg_job_fn) (struct bsg_job *); 325 typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t); 326 typedef void (exit_rq_fn)(struct request_queue *, struct request *); 327 328 enum blk_eh_timer_return { 329 BLK_EH_DONE, /* drivers has completed the command */ 330 BLK_EH_RESET_TIMER, /* reset timer and try again */ 331 }; 332 333 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); 334 335 enum blk_queue_state { 336 Queue_down, 337 Queue_up, 338 }; 339 340 struct blk_queue_tag { 341 struct request **tag_index; /* map of busy tags */ 342 unsigned long *tag_map; /* bit map of free/busy tags */ 343 int max_depth; /* what we will send to device */ 344 int real_max_depth; /* what the array can hold */ 345 atomic_t refcnt; /* map can be shared */ 346 int alloc_policy; /* tag allocation policy */ 347 int next_tag; /* next tag */ 348 }; 349 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ 350 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ 351 352 #define BLK_SCSI_MAX_CMDS (256) 353 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 354 355 /* 356 * Zoned block device models (zoned limit). 357 */ 358 enum blk_zoned_model { 359 BLK_ZONED_NONE, /* Regular block device */ 360 BLK_ZONED_HA, /* Host-aware zoned block device */ 361 BLK_ZONED_HM, /* Host-managed zoned block device */ 362 }; 363 364 struct queue_limits { 365 unsigned long bounce_pfn; 366 unsigned long seg_boundary_mask; 367 unsigned long virt_boundary_mask; 368 369 unsigned int max_hw_sectors; 370 unsigned int max_dev_sectors; 371 unsigned int chunk_sectors; 372 unsigned int max_sectors; 373 unsigned int max_segment_size; 374 unsigned int physical_block_size; 375 unsigned int alignment_offset; 376 unsigned int io_min; 377 unsigned int io_opt; 378 unsigned int max_discard_sectors; 379 unsigned int max_hw_discard_sectors; 380 unsigned int max_write_same_sectors; 381 unsigned int max_write_zeroes_sectors; 382 unsigned int discard_granularity; 383 unsigned int discard_alignment; 384 385 unsigned short logical_block_size; 386 unsigned short max_segments; 387 unsigned short max_integrity_segments; 388 unsigned short max_discard_segments; 389 390 unsigned char misaligned; 391 unsigned char discard_misaligned; 392 unsigned char cluster; 393 unsigned char raid_partial_stripes_expensive; 394 enum blk_zoned_model zoned; 395 }; 396 397 #ifdef CONFIG_BLK_DEV_ZONED 398 399 extern unsigned int blkdev_nr_zones(struct block_device *bdev); 400 extern int blkdev_report_zones(struct block_device *bdev, 401 sector_t sector, struct blk_zone *zones, 402 unsigned int *nr_zones, gfp_t gfp_mask); 403 extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, 404 sector_t nr_sectors, gfp_t gfp_mask); 405 extern int blk_revalidate_disk_zones(struct gendisk *disk); 406 407 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 408 unsigned int cmd, unsigned long arg); 409 extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, 410 unsigned int cmd, unsigned long arg); 411 412 #else /* CONFIG_BLK_DEV_ZONED */ 413 414 static inline unsigned int blkdev_nr_zones(struct block_device *bdev) 415 { 416 return 0; 417 } 418 419 static inline int blk_revalidate_disk_zones(struct gendisk *disk) 420 { 421 return 0; 422 } 423 424 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 425 fmode_t mode, unsigned int cmd, 426 unsigned long arg) 427 { 428 return -ENOTTY; 429 } 430 431 static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, 432 fmode_t mode, unsigned int cmd, 433 unsigned long arg) 434 { 435 return -ENOTTY; 436 } 437 438 #endif /* CONFIG_BLK_DEV_ZONED */ 439 440 struct request_queue { 441 /* 442 * Together with queue_head for cacheline sharing 443 */ 444 struct list_head queue_head; 445 struct request *last_merge; 446 struct elevator_queue *elevator; 447 int nr_rqs[2]; /* # allocated [a]sync rqs */ 448 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ 449 450 struct blk_queue_stats *stats; 451 struct rq_qos *rq_qos; 452 453 /* 454 * If blkcg is not used, @q->root_rl serves all requests. If blkcg 455 * is used, root blkg allocates from @q->root_rl and all other 456 * blkgs from their own blkg->rl. Which one to use should be 457 * determined using bio_request_list(). 458 */ 459 struct request_list root_rl; 460 461 request_fn_proc *request_fn; 462 make_request_fn *make_request_fn; 463 poll_q_fn *poll_fn; 464 prep_rq_fn *prep_rq_fn; 465 unprep_rq_fn *unprep_rq_fn; 466 softirq_done_fn *softirq_done_fn; 467 rq_timed_out_fn *rq_timed_out_fn; 468 dma_drain_needed_fn *dma_drain_needed; 469 lld_busy_fn *lld_busy_fn; 470 /* Called just after a request is allocated */ 471 init_rq_fn *init_rq_fn; 472 /* Called just before a request is freed */ 473 exit_rq_fn *exit_rq_fn; 474 /* Called from inside blk_get_request() */ 475 void (*initialize_rq_fn)(struct request *rq); 476 477 const struct blk_mq_ops *mq_ops; 478 479 unsigned int *mq_map; 480 481 /* sw queues */ 482 struct blk_mq_ctx __percpu *queue_ctx; 483 unsigned int nr_queues; 484 485 unsigned int queue_depth; 486 487 /* hw dispatch queues */ 488 struct blk_mq_hw_ctx **queue_hw_ctx; 489 unsigned int nr_hw_queues; 490 491 /* 492 * Dispatch queue sorting 493 */ 494 sector_t end_sector; 495 struct request *boundary_rq; 496 497 /* 498 * Delayed queue handling 499 */ 500 struct delayed_work delay_work; 501 502 struct backing_dev_info *backing_dev_info; 503 504 /* 505 * The queue owner gets to use this for whatever they like. 506 * ll_rw_blk doesn't touch it. 507 */ 508 void *queuedata; 509 510 /* 511 * various queue flags, see QUEUE_* below 512 */ 513 unsigned long queue_flags; 514 /* 515 * Number of contexts that have called blk_set_pm_only(). If this 516 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are 517 * processed. 518 */ 519 atomic_t pm_only; 520 521 /* 522 * ida allocated id for this queue. Used to index queues from 523 * ioctx. 524 */ 525 int id; 526 527 /* 528 * queue needs bounce pages for pages above this limit 529 */ 530 gfp_t bounce_gfp; 531 532 /* 533 * protects queue structures from reentrancy. ->__queue_lock should 534 * _never_ be used directly, it is queue private. always use 535 * ->queue_lock. 536 */ 537 spinlock_t __queue_lock; 538 spinlock_t *queue_lock; 539 540 /* 541 * queue kobject 542 */ 543 struct kobject kobj; 544 545 /* 546 * mq queue kobject 547 */ 548 struct kobject mq_kobj; 549 550 #ifdef CONFIG_BLK_DEV_INTEGRITY 551 struct blk_integrity integrity; 552 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 553 554 #ifdef CONFIG_PM 555 struct device *dev; 556 int rpm_status; 557 unsigned int nr_pending; 558 #endif 559 560 /* 561 * queue settings 562 */ 563 unsigned long nr_requests; /* Max # of requests */ 564 unsigned int nr_congestion_on; 565 unsigned int nr_congestion_off; 566 unsigned int nr_batching; 567 568 unsigned int dma_drain_size; 569 void *dma_drain_buffer; 570 unsigned int dma_pad_mask; 571 unsigned int dma_alignment; 572 573 struct blk_queue_tag *queue_tags; 574 575 unsigned int nr_sorted; 576 unsigned int in_flight[2]; 577 578 /* 579 * Number of active block driver functions for which blk_drain_queue() 580 * must wait. Must be incremented around functions that unlock the 581 * queue_lock internally, e.g. scsi_request_fn(). 582 */ 583 unsigned int request_fn_active; 584 585 unsigned int rq_timeout; 586 int poll_nsec; 587 588 struct blk_stat_callback *poll_cb; 589 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; 590 591 struct timer_list timeout; 592 struct work_struct timeout_work; 593 struct list_head timeout_list; 594 595 struct list_head icq_list; 596 #ifdef CONFIG_BLK_CGROUP 597 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 598 struct blkcg_gq *root_blkg; 599 struct list_head blkg_list; 600 #endif 601 602 struct queue_limits limits; 603 604 #ifdef CONFIG_BLK_DEV_ZONED 605 /* 606 * Zoned block device information for request dispatch control. 607 * nr_zones is the total number of zones of the device. This is always 608 * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones 609 * bits which indicates if a zone is conventional (bit clear) or 610 * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones 611 * bits which indicates if a zone is write locked, that is, if a write 612 * request targeting the zone was dispatched. All three fields are 613 * initialized by the low level device driver (e.g. scsi/sd.c). 614 * Stacking drivers (device mappers) may or may not initialize 615 * these fields. 616 * 617 * Reads of this information must be protected with blk_queue_enter() / 618 * blk_queue_exit(). Modifying this information is only allowed while 619 * no requests are being processed. See also blk_mq_freeze_queue() and 620 * blk_mq_unfreeze_queue(). 621 */ 622 unsigned int nr_zones; 623 unsigned long *seq_zones_bitmap; 624 unsigned long *seq_zones_wlock; 625 #endif /* CONFIG_BLK_DEV_ZONED */ 626 627 /* 628 * sg stuff 629 */ 630 unsigned int sg_timeout; 631 unsigned int sg_reserved_size; 632 int node; 633 #ifdef CONFIG_BLK_DEV_IO_TRACE 634 struct blk_trace *blk_trace; 635 struct mutex blk_trace_mutex; 636 #endif 637 /* 638 * for flush operations 639 */ 640 struct blk_flush_queue *fq; 641 642 struct list_head requeue_list; 643 spinlock_t requeue_lock; 644 struct delayed_work requeue_work; 645 646 struct mutex sysfs_lock; 647 648 int bypass_depth; 649 atomic_t mq_freeze_depth; 650 651 #if defined(CONFIG_BLK_DEV_BSG) 652 bsg_job_fn *bsg_job_fn; 653 struct bsg_class_device bsg_dev; 654 #endif 655 656 #ifdef CONFIG_BLK_DEV_THROTTLING 657 /* Throttle data */ 658 struct throtl_data *td; 659 #endif 660 struct rcu_head rcu_head; 661 wait_queue_head_t mq_freeze_wq; 662 struct percpu_ref q_usage_counter; 663 struct list_head all_q_node; 664 665 struct blk_mq_tag_set *tag_set; 666 struct list_head tag_set_list; 667 struct bio_set bio_split; 668 669 #ifdef CONFIG_BLK_DEBUG_FS 670 struct dentry *debugfs_dir; 671 struct dentry *sched_debugfs_dir; 672 #endif 673 674 bool mq_sysfs_init_done; 675 676 size_t cmd_size; 677 void *rq_alloc_data; 678 679 struct work_struct release_work; 680 681 #define BLK_MAX_WRITE_HINTS 5 682 u64 write_hints[BLK_MAX_WRITE_HINTS]; 683 }; 684 685 #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */ 686 #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */ 687 #define QUEUE_FLAG_DYING 2 /* queue being torn down */ 688 #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */ 689 #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */ 690 #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */ 691 #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */ 692 #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */ 693 #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */ 694 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 695 #define QUEUE_FLAG_IO_STAT 10 /* do disk/partitions IO accounting */ 696 #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */ 697 #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */ 698 #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */ 699 #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */ 700 #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */ 701 #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */ 702 #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */ 703 #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/ 704 #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */ 705 #define QUEUE_FLAG_WC 20 /* Write back caching */ 706 #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */ 707 #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */ 708 #define QUEUE_FLAG_DAX 23 /* device supports DAX */ 709 #define QUEUE_FLAG_STATS 24 /* track IO start and completion times */ 710 #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */ 711 #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ 712 #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ 713 #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ 714 #define QUEUE_FLAG_PCI_P2PDMA 29 /* device supports PCI p2p requests */ 715 716 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 717 (1 << QUEUE_FLAG_SAME_COMP) | \ 718 (1 << QUEUE_FLAG_ADD_RANDOM)) 719 720 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 721 (1 << QUEUE_FLAG_SAME_COMP) | \ 722 (1 << QUEUE_FLAG_POLL)) 723 724 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 725 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 726 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 727 bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); 728 729 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) 730 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 731 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 732 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 733 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) 734 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 735 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 736 #define blk_queue_noxmerges(q) \ 737 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 738 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 739 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 740 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 741 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 742 #define blk_queue_secure_erase(q) \ 743 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 744 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 745 #define blk_queue_scsi_passthrough(q) \ 746 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 747 #define blk_queue_pci_p2pdma(q) \ 748 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 749 750 #define blk_noretry_request(rq) \ 751 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 752 REQ_FAILFAST_DRIVER)) 753 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 754 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 755 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 756 757 extern void blk_set_pm_only(struct request_queue *q); 758 extern void blk_clear_pm_only(struct request_queue *q); 759 760 static inline int queue_in_flight(struct request_queue *q) 761 { 762 return q->in_flight[0] + q->in_flight[1]; 763 } 764 765 static inline bool blk_account_rq(struct request *rq) 766 { 767 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 768 } 769 770 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) 771 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) 772 /* rq->queuelist of dequeued request must be list_empty() */ 773 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) 774 775 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 776 777 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 778 779 /* 780 * Driver can handle struct request, if it either has an old style 781 * request_fn defined, or is blk-mq based. 782 */ 783 static inline bool queue_is_rq_based(struct request_queue *q) 784 { 785 return q->request_fn || q->mq_ops; 786 } 787 788 static inline unsigned int blk_queue_cluster(struct request_queue *q) 789 { 790 return q->limits.cluster; 791 } 792 793 static inline enum blk_zoned_model 794 blk_queue_zoned_model(struct request_queue *q) 795 { 796 return q->limits.zoned; 797 } 798 799 static inline bool blk_queue_is_zoned(struct request_queue *q) 800 { 801 switch (blk_queue_zoned_model(q)) { 802 case BLK_ZONED_HA: 803 case BLK_ZONED_HM: 804 return true; 805 default: 806 return false; 807 } 808 } 809 810 static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) 811 { 812 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 813 } 814 815 #ifdef CONFIG_BLK_DEV_ZONED 816 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 817 { 818 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 819 } 820 821 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 822 sector_t sector) 823 { 824 if (!blk_queue_is_zoned(q)) 825 return 0; 826 return sector >> ilog2(q->limits.chunk_sectors); 827 } 828 829 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 830 sector_t sector) 831 { 832 if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap) 833 return false; 834 return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap); 835 } 836 #else /* CONFIG_BLK_DEV_ZONED */ 837 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 838 { 839 return 0; 840 } 841 #endif /* CONFIG_BLK_DEV_ZONED */ 842 843 static inline bool rq_is_sync(struct request *rq) 844 { 845 return op_is_sync(rq->cmd_flags); 846 } 847 848 static inline bool blk_rl_full(struct request_list *rl, bool sync) 849 { 850 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; 851 852 return rl->flags & flag; 853 } 854 855 static inline void blk_set_rl_full(struct request_list *rl, bool sync) 856 { 857 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; 858 859 rl->flags |= flag; 860 } 861 862 static inline void blk_clear_rl_full(struct request_list *rl, bool sync) 863 { 864 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; 865 866 rl->flags &= ~flag; 867 } 868 869 static inline bool rq_mergeable(struct request *rq) 870 { 871 if (blk_rq_is_passthrough(rq)) 872 return false; 873 874 if (req_op(rq) == REQ_OP_FLUSH) 875 return false; 876 877 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 878 return false; 879 880 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 881 return false; 882 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 883 return false; 884 885 return true; 886 } 887 888 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 889 { 890 if (bio_page(a) == bio_page(b) && 891 bio_offset(a) == bio_offset(b)) 892 return true; 893 894 return false; 895 } 896 897 static inline unsigned int blk_queue_depth(struct request_queue *q) 898 { 899 if (q->queue_depth) 900 return q->queue_depth; 901 902 return q->nr_requests; 903 } 904 905 /* 906 * q->prep_rq_fn return values 907 */ 908 enum { 909 BLKPREP_OK, /* serve it */ 910 BLKPREP_KILL, /* fatal error, kill, return -EIO */ 911 BLKPREP_DEFER, /* leave on queue */ 912 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ 913 }; 914 915 extern unsigned long blk_max_low_pfn, blk_max_pfn; 916 917 /* 918 * standard bounce addresses: 919 * 920 * BLK_BOUNCE_HIGH : bounce all highmem pages 921 * BLK_BOUNCE_ANY : don't bounce anything 922 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 923 */ 924 925 #if BITS_PER_LONG == 32 926 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 927 #else 928 #define BLK_BOUNCE_HIGH -1ULL 929 #endif 930 #define BLK_BOUNCE_ANY (-1ULL) 931 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 932 933 /* 934 * default timeout for SG_IO if none specified 935 */ 936 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 937 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 938 939 struct rq_map_data { 940 struct page **pages; 941 int page_order; 942 int nr_entries; 943 unsigned long offset; 944 int null_mapped; 945 int from_user; 946 }; 947 948 struct req_iterator { 949 struct bvec_iter iter; 950 struct bio *bio; 951 }; 952 953 /* This should not be used directly - use rq_for_each_segment */ 954 #define for_each_bio(_bio) \ 955 for (; _bio; _bio = _bio->bi_next) 956 #define __rq_for_each_bio(_bio, rq) \ 957 if ((rq->bio)) \ 958 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 959 960 #define rq_for_each_segment(bvl, _rq, _iter) \ 961 __rq_for_each_bio(_iter.bio, _rq) \ 962 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 963 964 #define rq_iter_last(bvec, _iter) \ 965 (_iter.bio->bi_next == NULL && \ 966 bio_iter_last(bvec, _iter.iter)) 967 968 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 969 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 970 #endif 971 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 972 extern void rq_flush_dcache_pages(struct request *rq); 973 #else 974 static inline void rq_flush_dcache_pages(struct request *rq) 975 { 976 } 977 #endif 978 979 extern int blk_register_queue(struct gendisk *disk); 980 extern void blk_unregister_queue(struct gendisk *disk); 981 extern blk_qc_t generic_make_request(struct bio *bio); 982 extern blk_qc_t direct_make_request(struct bio *bio); 983 extern void blk_rq_init(struct request_queue *q, struct request *rq); 984 extern void blk_init_request_from_bio(struct request *req, struct bio *bio); 985 extern void blk_put_request(struct request *); 986 extern void __blk_put_request(struct request_queue *, struct request *); 987 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 988 blk_mq_req_flags_t flags); 989 extern void blk_requeue_request(struct request_queue *, struct request *); 990 extern int blk_lld_busy(struct request_queue *q); 991 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 992 struct bio_set *bs, gfp_t gfp_mask, 993 int (*bio_ctr)(struct bio *, struct bio *, void *), 994 void *data); 995 extern void blk_rq_unprep_clone(struct request *rq); 996 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 997 struct request *rq); 998 extern int blk_rq_append_bio(struct request *rq, struct bio **bio); 999 extern void blk_delay_queue(struct request_queue *, unsigned long); 1000 extern void blk_queue_split(struct request_queue *, struct bio **); 1001 extern void blk_recount_segments(struct request_queue *, struct bio *); 1002 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 1003 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 1004 unsigned int, void __user *); 1005 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 1006 unsigned int, void __user *); 1007 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 1008 struct scsi_ioctl_command __user *); 1009 1010 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 1011 extern void blk_queue_exit(struct request_queue *q); 1012 extern void blk_start_queue(struct request_queue *q); 1013 extern void blk_start_queue_async(struct request_queue *q); 1014 extern void blk_stop_queue(struct request_queue *q); 1015 extern void blk_sync_queue(struct request_queue *q); 1016 extern void __blk_stop_queue(struct request_queue *q); 1017 extern void __blk_run_queue(struct request_queue *q); 1018 extern void __blk_run_queue_uncond(struct request_queue *q); 1019 extern void blk_run_queue(struct request_queue *); 1020 extern void blk_run_queue_async(struct request_queue *q); 1021 extern int blk_rq_map_user(struct request_queue *, struct request *, 1022 struct rq_map_data *, void __user *, unsigned long, 1023 gfp_t); 1024 extern int blk_rq_unmap_user(struct bio *); 1025 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 1026 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 1027 struct rq_map_data *, const struct iov_iter *, 1028 gfp_t); 1029 extern void blk_execute_rq(struct request_queue *, struct gendisk *, 1030 struct request *, int); 1031 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 1032 struct request *, int, rq_end_io_fn *); 1033 1034 int blk_status_to_errno(blk_status_t status); 1035 blk_status_t errno_to_blk_status(int errno); 1036 1037 bool blk_poll(struct request_queue *q, blk_qc_t cookie); 1038 1039 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 1040 { 1041 return bdev->bd_disk->queue; /* this is never NULL */ 1042 } 1043 1044 /* 1045 * The basic unit of block I/O is a sector. It is used in a number of contexts 1046 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 1047 * bytes. Variables of type sector_t represent an offset or size that is a 1048 * multiple of 512 bytes. Hence these two constants. 1049 */ 1050 #ifndef SECTOR_SHIFT 1051 #define SECTOR_SHIFT 9 1052 #endif 1053 #ifndef SECTOR_SIZE 1054 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 1055 #endif 1056 1057 /* 1058 * blk_rq_pos() : the current sector 1059 * blk_rq_bytes() : bytes left in the entire request 1060 * blk_rq_cur_bytes() : bytes left in the current segment 1061 * blk_rq_err_bytes() : bytes left till the next error boundary 1062 * blk_rq_sectors() : sectors left in the entire request 1063 * blk_rq_cur_sectors() : sectors left in the current segment 1064 */ 1065 static inline sector_t blk_rq_pos(const struct request *rq) 1066 { 1067 return rq->__sector; 1068 } 1069 1070 static inline unsigned int blk_rq_bytes(const struct request *rq) 1071 { 1072 return rq->__data_len; 1073 } 1074 1075 static inline int blk_rq_cur_bytes(const struct request *rq) 1076 { 1077 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 1078 } 1079 1080 extern unsigned int blk_rq_err_bytes(const struct request *rq); 1081 1082 static inline unsigned int blk_rq_sectors(const struct request *rq) 1083 { 1084 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 1085 } 1086 1087 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 1088 { 1089 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 1090 } 1091 1092 #ifdef CONFIG_BLK_DEV_ZONED 1093 static inline unsigned int blk_rq_zone_no(struct request *rq) 1094 { 1095 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1096 } 1097 1098 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1099 { 1100 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1101 } 1102 #endif /* CONFIG_BLK_DEV_ZONED */ 1103 1104 /* 1105 * Some commands like WRITE SAME have a payload or data transfer size which 1106 * is different from the size of the request. Any driver that supports such 1107 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1108 * calculate the data transfer size. 1109 */ 1110 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1111 { 1112 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1113 return rq->special_vec.bv_len; 1114 return blk_rq_bytes(rq); 1115 } 1116 1117 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1118 int op) 1119 { 1120 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1121 return min(q->limits.max_discard_sectors, 1122 UINT_MAX >> SECTOR_SHIFT); 1123 1124 if (unlikely(op == REQ_OP_WRITE_SAME)) 1125 return q->limits.max_write_same_sectors; 1126 1127 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1128 return q->limits.max_write_zeroes_sectors; 1129 1130 return q->limits.max_sectors; 1131 } 1132 1133 /* 1134 * Return maximum size of a request at given offset. Only valid for 1135 * file system requests. 1136 */ 1137 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1138 sector_t offset) 1139 { 1140 if (!q->limits.chunk_sectors) 1141 return q->limits.max_sectors; 1142 1143 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - 1144 (offset & (q->limits.chunk_sectors - 1)))); 1145 } 1146 1147 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1148 sector_t offset) 1149 { 1150 struct request_queue *q = rq->q; 1151 1152 if (blk_rq_is_passthrough(rq)) 1153 return q->limits.max_hw_sectors; 1154 1155 if (!q->limits.chunk_sectors || 1156 req_op(rq) == REQ_OP_DISCARD || 1157 req_op(rq) == REQ_OP_SECURE_ERASE) 1158 return blk_queue_get_max_sectors(q, req_op(rq)); 1159 1160 return min(blk_max_size_offset(q, offset), 1161 blk_queue_get_max_sectors(q, req_op(rq))); 1162 } 1163 1164 static inline unsigned int blk_rq_count_bios(struct request *rq) 1165 { 1166 unsigned int nr_bios = 0; 1167 struct bio *bio; 1168 1169 __rq_for_each_bio(bio, rq) 1170 nr_bios++; 1171 1172 return nr_bios; 1173 } 1174 1175 /* 1176 * Request issue related functions. 1177 */ 1178 extern struct request *blk_peek_request(struct request_queue *q); 1179 extern void blk_start_request(struct request *rq); 1180 extern struct request *blk_fetch_request(struct request_queue *q); 1181 1182 void blk_steal_bios(struct bio_list *list, struct request *rq); 1183 1184 /* 1185 * Request completion related functions. 1186 * 1187 * blk_update_request() completes given number of bytes and updates 1188 * the request without completing it. 1189 * 1190 * blk_end_request() and friends. __blk_end_request() must be called 1191 * with the request queue spinlock acquired. 1192 * 1193 * Several drivers define their own end_request and call 1194 * blk_end_request() for parts of the original function. 1195 * This prevents code duplication in drivers. 1196 */ 1197 extern bool blk_update_request(struct request *rq, blk_status_t error, 1198 unsigned int nr_bytes); 1199 extern void blk_finish_request(struct request *rq, blk_status_t error); 1200 extern bool blk_end_request(struct request *rq, blk_status_t error, 1201 unsigned int nr_bytes); 1202 extern void blk_end_request_all(struct request *rq, blk_status_t error); 1203 extern bool __blk_end_request(struct request *rq, blk_status_t error, 1204 unsigned int nr_bytes); 1205 extern void __blk_end_request_all(struct request *rq, blk_status_t error); 1206 extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); 1207 1208 extern void blk_complete_request(struct request *); 1209 extern void __blk_complete_request(struct request *); 1210 extern void blk_abort_request(struct request *); 1211 extern void blk_unprep_request(struct request *); 1212 1213 /* 1214 * Access functions for manipulating queue properties 1215 */ 1216 extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, 1217 spinlock_t *lock, int node_id); 1218 extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); 1219 extern int blk_init_allocated_queue(struct request_queue *); 1220 extern void blk_cleanup_queue(struct request_queue *); 1221 extern void blk_queue_make_request(struct request_queue *, make_request_fn *); 1222 extern void blk_queue_bounce_limit(struct request_queue *, u64); 1223 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1224 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1225 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1226 extern void blk_queue_max_discard_segments(struct request_queue *, 1227 unsigned short); 1228 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1229 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1230 unsigned int max_discard_sectors); 1231 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1232 unsigned int max_write_same_sectors); 1233 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1234 unsigned int max_write_same_sectors); 1235 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); 1236 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1237 extern void blk_queue_alignment_offset(struct request_queue *q, 1238 unsigned int alignment); 1239 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1240 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1241 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1242 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1243 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1244 extern void blk_set_default_limits(struct queue_limits *lim); 1245 extern void blk_set_stacking_limits(struct queue_limits *lim); 1246 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1247 sector_t offset); 1248 extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, 1249 sector_t offset); 1250 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1251 sector_t offset); 1252 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); 1253 extern void blk_queue_dma_pad(struct request_queue *, unsigned int); 1254 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1255 extern int blk_queue_dma_drain(struct request_queue *q, 1256 dma_drain_needed_fn *dma_drain_needed, 1257 void *buf, unsigned int size); 1258 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); 1259 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1260 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1261 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); 1262 extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); 1263 extern void blk_queue_dma_alignment(struct request_queue *, int); 1264 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1265 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); 1266 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); 1267 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1268 extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); 1269 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1270 1271 /* 1272 * Number of physical segments as sent to the device. 1273 * 1274 * Normally this is the number of discontiguous data segments sent by the 1275 * submitter. But for data-less command like discard we might have no 1276 * actual data segments submitted, but the driver might have to add it's 1277 * own special payload. In that case we still return 1 here so that this 1278 * special payload will be mapped. 1279 */ 1280 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1281 { 1282 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1283 return 1; 1284 return rq->nr_phys_segments; 1285 } 1286 1287 /* 1288 * Number of discard segments (or ranges) the driver needs to fill in. 1289 * Each discard bio merged into a request is counted as one segment. 1290 */ 1291 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1292 { 1293 return max_t(unsigned short, rq->nr_phys_segments, 1); 1294 } 1295 1296 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); 1297 extern void blk_dump_rq_flags(struct request *, char *); 1298 extern long nr_blockdev_pages(void); 1299 1300 bool __must_check blk_get_queue(struct request_queue *); 1301 struct request_queue *blk_alloc_queue(gfp_t); 1302 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, 1303 spinlock_t *lock); 1304 extern void blk_put_queue(struct request_queue *); 1305 extern void blk_set_queue_dying(struct request_queue *); 1306 1307 /* 1308 * blk_plug permits building a queue of related requests by holding the I/O 1309 * fragments for a short period. This allows merging of sequential requests 1310 * into single larger request. As the requests are moved from a per-task list to 1311 * the device's request_queue in a batch, this results in improved scalability 1312 * as the lock contention for request_queue lock is reduced. 1313 * 1314 * It is ok not to disable preemption when adding the request to the plug list 1315 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1316 * the plug list when the task sleeps by itself. For details, please see 1317 * schedule() where blk_schedule_flush_plug() is called. 1318 */ 1319 struct blk_plug { 1320 struct list_head list; /* requests */ 1321 struct list_head mq_list; /* blk-mq requests */ 1322 struct list_head cb_list; /* md requires an unplug callback */ 1323 }; 1324 #define BLK_MAX_REQUEST_COUNT 16 1325 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1326 1327 struct blk_plug_cb; 1328 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1329 struct blk_plug_cb { 1330 struct list_head list; 1331 blk_plug_cb_fn callback; 1332 void *data; 1333 }; 1334 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1335 void *data, int size); 1336 extern void blk_start_plug(struct blk_plug *); 1337 extern void blk_finish_plug(struct blk_plug *); 1338 extern void blk_flush_plug_list(struct blk_plug *, bool); 1339 1340 static inline void blk_flush_plug(struct task_struct *tsk) 1341 { 1342 struct blk_plug *plug = tsk->plug; 1343 1344 if (plug) 1345 blk_flush_plug_list(plug, false); 1346 } 1347 1348 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1349 { 1350 struct blk_plug *plug = tsk->plug; 1351 1352 if (plug) 1353 blk_flush_plug_list(plug, true); 1354 } 1355 1356 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1357 { 1358 struct blk_plug *plug = tsk->plug; 1359 1360 return plug && 1361 (!list_empty(&plug->list) || 1362 !list_empty(&plug->mq_list) || 1363 !list_empty(&plug->cb_list)); 1364 } 1365 1366 /* 1367 * tag stuff 1368 */ 1369 extern int blk_queue_start_tag(struct request_queue *, struct request *); 1370 extern struct request *blk_queue_find_tag(struct request_queue *, int); 1371 extern void blk_queue_end_tag(struct request_queue *, struct request *); 1372 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); 1373 extern void blk_queue_free_tags(struct request_queue *); 1374 extern int blk_queue_resize_tags(struct request_queue *, int); 1375 extern struct blk_queue_tag *blk_init_tags(int, int); 1376 extern void blk_free_tags(struct blk_queue_tag *); 1377 1378 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, 1379 int tag) 1380 { 1381 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) 1382 return NULL; 1383 return bqt->tag_index[tag]; 1384 } 1385 1386 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); 1387 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1388 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1389 1390 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1391 1392 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1393 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1394 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1395 sector_t nr_sects, gfp_t gfp_mask, int flags, 1396 struct bio **biop); 1397 1398 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1399 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1400 1401 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1402 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1403 unsigned flags); 1404 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1405 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1406 1407 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1408 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1409 { 1410 return blkdev_issue_discard(sb->s_bdev, 1411 block << (sb->s_blocksize_bits - 1412 SECTOR_SHIFT), 1413 nr_blocks << (sb->s_blocksize_bits - 1414 SECTOR_SHIFT), 1415 gfp_mask, flags); 1416 } 1417 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1418 sector_t nr_blocks, gfp_t gfp_mask) 1419 { 1420 return blkdev_issue_zeroout(sb->s_bdev, 1421 block << (sb->s_blocksize_bits - 1422 SECTOR_SHIFT), 1423 nr_blocks << (sb->s_blocksize_bits - 1424 SECTOR_SHIFT), 1425 gfp_mask, 0); 1426 } 1427 1428 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1429 1430 enum blk_default_limits { 1431 BLK_MAX_SEGMENTS = 128, 1432 BLK_SAFE_MAX_SECTORS = 255, 1433 BLK_DEF_MAX_SECTORS = 2560, 1434 BLK_MAX_SEGMENT_SIZE = 65536, 1435 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1436 }; 1437 1438 static inline unsigned long queue_segment_boundary(struct request_queue *q) 1439 { 1440 return q->limits.seg_boundary_mask; 1441 } 1442 1443 static inline unsigned long queue_virt_boundary(struct request_queue *q) 1444 { 1445 return q->limits.virt_boundary_mask; 1446 } 1447 1448 static inline unsigned int queue_max_sectors(struct request_queue *q) 1449 { 1450 return q->limits.max_sectors; 1451 } 1452 1453 static inline unsigned int queue_max_hw_sectors(struct request_queue *q) 1454 { 1455 return q->limits.max_hw_sectors; 1456 } 1457 1458 static inline unsigned short queue_max_segments(struct request_queue *q) 1459 { 1460 return q->limits.max_segments; 1461 } 1462 1463 static inline unsigned short queue_max_discard_segments(struct request_queue *q) 1464 { 1465 return q->limits.max_discard_segments; 1466 } 1467 1468 static inline unsigned int queue_max_segment_size(struct request_queue *q) 1469 { 1470 return q->limits.max_segment_size; 1471 } 1472 1473 static inline unsigned short queue_logical_block_size(struct request_queue *q) 1474 { 1475 int retval = 512; 1476 1477 if (q && q->limits.logical_block_size) 1478 retval = q->limits.logical_block_size; 1479 1480 return retval; 1481 } 1482 1483 static inline unsigned short bdev_logical_block_size(struct block_device *bdev) 1484 { 1485 return queue_logical_block_size(bdev_get_queue(bdev)); 1486 } 1487 1488 static inline unsigned int queue_physical_block_size(struct request_queue *q) 1489 { 1490 return q->limits.physical_block_size; 1491 } 1492 1493 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1494 { 1495 return queue_physical_block_size(bdev_get_queue(bdev)); 1496 } 1497 1498 static inline unsigned int queue_io_min(struct request_queue *q) 1499 { 1500 return q->limits.io_min; 1501 } 1502 1503 static inline int bdev_io_min(struct block_device *bdev) 1504 { 1505 return queue_io_min(bdev_get_queue(bdev)); 1506 } 1507 1508 static inline unsigned int queue_io_opt(struct request_queue *q) 1509 { 1510 return q->limits.io_opt; 1511 } 1512 1513 static inline int bdev_io_opt(struct block_device *bdev) 1514 { 1515 return queue_io_opt(bdev_get_queue(bdev)); 1516 } 1517 1518 static inline int queue_alignment_offset(struct request_queue *q) 1519 { 1520 if (q->limits.misaligned) 1521 return -1; 1522 1523 return q->limits.alignment_offset; 1524 } 1525 1526 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1527 { 1528 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1529 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1530 << SECTOR_SHIFT; 1531 1532 return (granularity + lim->alignment_offset - alignment) % granularity; 1533 } 1534 1535 static inline int bdev_alignment_offset(struct block_device *bdev) 1536 { 1537 struct request_queue *q = bdev_get_queue(bdev); 1538 1539 if (q->limits.misaligned) 1540 return -1; 1541 1542 if (bdev != bdev->bd_contains) 1543 return bdev->bd_part->alignment_offset; 1544 1545 return q->limits.alignment_offset; 1546 } 1547 1548 static inline int queue_discard_alignment(struct request_queue *q) 1549 { 1550 if (q->limits.discard_misaligned) 1551 return -1; 1552 1553 return q->limits.discard_alignment; 1554 } 1555 1556 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1557 { 1558 unsigned int alignment, granularity, offset; 1559 1560 if (!lim->max_discard_sectors) 1561 return 0; 1562 1563 /* Why are these in bytes, not sectors? */ 1564 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1565 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1566 if (!granularity) 1567 return 0; 1568 1569 /* Offset of the partition start in 'granularity' sectors */ 1570 offset = sector_div(sector, granularity); 1571 1572 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1573 offset = (granularity + alignment - offset) % granularity; 1574 1575 /* Turn it back into bytes, gaah */ 1576 return offset << SECTOR_SHIFT; 1577 } 1578 1579 static inline int bdev_discard_alignment(struct block_device *bdev) 1580 { 1581 struct request_queue *q = bdev_get_queue(bdev); 1582 1583 if (bdev != bdev->bd_contains) 1584 return bdev->bd_part->discard_alignment; 1585 1586 return q->limits.discard_alignment; 1587 } 1588 1589 static inline unsigned int bdev_write_same(struct block_device *bdev) 1590 { 1591 struct request_queue *q = bdev_get_queue(bdev); 1592 1593 if (q) 1594 return q->limits.max_write_same_sectors; 1595 1596 return 0; 1597 } 1598 1599 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1600 { 1601 struct request_queue *q = bdev_get_queue(bdev); 1602 1603 if (q) 1604 return q->limits.max_write_zeroes_sectors; 1605 1606 return 0; 1607 } 1608 1609 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1610 { 1611 struct request_queue *q = bdev_get_queue(bdev); 1612 1613 if (q) 1614 return blk_queue_zoned_model(q); 1615 1616 return BLK_ZONED_NONE; 1617 } 1618 1619 static inline bool bdev_is_zoned(struct block_device *bdev) 1620 { 1621 struct request_queue *q = bdev_get_queue(bdev); 1622 1623 if (q) 1624 return blk_queue_is_zoned(q); 1625 1626 return false; 1627 } 1628 1629 static inline unsigned int bdev_zone_sectors(struct block_device *bdev) 1630 { 1631 struct request_queue *q = bdev_get_queue(bdev); 1632 1633 if (q) 1634 return blk_queue_zone_sectors(q); 1635 return 0; 1636 } 1637 1638 static inline int queue_dma_alignment(struct request_queue *q) 1639 { 1640 return q ? q->dma_alignment : 511; 1641 } 1642 1643 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1644 unsigned int len) 1645 { 1646 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1647 return !(addr & alignment) && !(len & alignment); 1648 } 1649 1650 /* assumes size > 256 */ 1651 static inline unsigned int blksize_bits(unsigned int size) 1652 { 1653 unsigned int bits = 8; 1654 do { 1655 bits++; 1656 size >>= 1; 1657 } while (size > 256); 1658 return bits; 1659 } 1660 1661 static inline unsigned int block_size(struct block_device *bdev) 1662 { 1663 return bdev->bd_block_size; 1664 } 1665 1666 static inline bool queue_flush_queueable(struct request_queue *q) 1667 { 1668 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); 1669 } 1670 1671 typedef struct {struct page *v;} Sector; 1672 1673 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); 1674 1675 static inline void put_dev_sector(Sector p) 1676 { 1677 put_page(p.v); 1678 } 1679 1680 int kblockd_schedule_work(struct work_struct *work); 1681 int kblockd_schedule_work_on(int cpu, struct work_struct *work); 1682 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1683 1684 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1685 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1686 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1687 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1688 1689 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1690 1691 enum blk_integrity_flags { 1692 BLK_INTEGRITY_VERIFY = 1 << 0, 1693 BLK_INTEGRITY_GENERATE = 1 << 1, 1694 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1695 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1696 }; 1697 1698 struct blk_integrity_iter { 1699 void *prot_buf; 1700 void *data_buf; 1701 sector_t seed; 1702 unsigned int data_size; 1703 unsigned short interval; 1704 const char *disk_name; 1705 }; 1706 1707 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1708 1709 struct blk_integrity_profile { 1710 integrity_processing_fn *generate_fn; 1711 integrity_processing_fn *verify_fn; 1712 const char *name; 1713 }; 1714 1715 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1716 extern void blk_integrity_unregister(struct gendisk *); 1717 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1718 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1719 struct scatterlist *); 1720 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1721 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, 1722 struct request *); 1723 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, 1724 struct bio *); 1725 1726 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1727 { 1728 struct blk_integrity *bi = &disk->queue->integrity; 1729 1730 if (!bi->profile) 1731 return NULL; 1732 1733 return bi; 1734 } 1735 1736 static inline 1737 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1738 { 1739 return blk_get_integrity(bdev->bd_disk); 1740 } 1741 1742 static inline bool blk_integrity_rq(struct request *rq) 1743 { 1744 return rq->cmd_flags & REQ_INTEGRITY; 1745 } 1746 1747 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1748 unsigned int segs) 1749 { 1750 q->limits.max_integrity_segments = segs; 1751 } 1752 1753 static inline unsigned short 1754 queue_max_integrity_segments(struct request_queue *q) 1755 { 1756 return q->limits.max_integrity_segments; 1757 } 1758 1759 /** 1760 * bio_integrity_intervals - Return number of integrity intervals for a bio 1761 * @bi: blk_integrity profile for device 1762 * @sectors: Size of the bio in 512-byte sectors 1763 * 1764 * Description: The block layer calculates everything in 512 byte 1765 * sectors but integrity metadata is done in terms of the data integrity 1766 * interval size of the storage device. Convert the block layer sectors 1767 * to the appropriate number of integrity intervals. 1768 */ 1769 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1770 unsigned int sectors) 1771 { 1772 return sectors >> (bi->interval_exp - 9); 1773 } 1774 1775 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1776 unsigned int sectors) 1777 { 1778 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1779 } 1780 1781 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1782 1783 struct bio; 1784 struct block_device; 1785 struct gendisk; 1786 struct blk_integrity; 1787 1788 static inline int blk_integrity_rq(struct request *rq) 1789 { 1790 return 0; 1791 } 1792 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1793 struct bio *b) 1794 { 1795 return 0; 1796 } 1797 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1798 struct bio *b, 1799 struct scatterlist *s) 1800 { 1801 return 0; 1802 } 1803 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1804 { 1805 return NULL; 1806 } 1807 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1808 { 1809 return NULL; 1810 } 1811 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1812 { 1813 return 0; 1814 } 1815 static inline void blk_integrity_register(struct gendisk *d, 1816 struct blk_integrity *b) 1817 { 1818 } 1819 static inline void blk_integrity_unregister(struct gendisk *d) 1820 { 1821 } 1822 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1823 unsigned int segs) 1824 { 1825 } 1826 static inline unsigned short queue_max_integrity_segments(struct request_queue *q) 1827 { 1828 return 0; 1829 } 1830 static inline bool blk_integrity_merge_rq(struct request_queue *rq, 1831 struct request *r1, 1832 struct request *r2) 1833 { 1834 return true; 1835 } 1836 static inline bool blk_integrity_merge_bio(struct request_queue *rq, 1837 struct request *r, 1838 struct bio *b) 1839 { 1840 return true; 1841 } 1842 1843 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1844 unsigned int sectors) 1845 { 1846 return 0; 1847 } 1848 1849 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1850 unsigned int sectors) 1851 { 1852 return 0; 1853 } 1854 1855 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1856 1857 struct block_device_operations { 1858 int (*open) (struct block_device *, fmode_t); 1859 void (*release) (struct gendisk *, fmode_t); 1860 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1861 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1862 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1863 unsigned int (*check_events) (struct gendisk *disk, 1864 unsigned int clearing); 1865 /* ->media_changed() is DEPRECATED, use ->check_events() instead */ 1866 int (*media_changed) (struct gendisk *); 1867 void (*unlock_native_capacity) (struct gendisk *); 1868 int (*revalidate_disk) (struct gendisk *); 1869 int (*getgeo)(struct block_device *, struct hd_geometry *); 1870 /* this callback is with swap_lock and sometimes page table lock held */ 1871 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1872 int (*report_zones)(struct gendisk *, sector_t sector, 1873 struct blk_zone *zones, unsigned int *nr_zones, 1874 gfp_t gfp_mask); 1875 struct module *owner; 1876 const struct pr_ops *pr_ops; 1877 }; 1878 1879 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1880 unsigned long); 1881 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1882 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1883 struct writeback_control *); 1884 1885 #ifdef CONFIG_BLK_DEV_ZONED 1886 bool blk_req_needs_zone_write_lock(struct request *rq); 1887 void __blk_req_zone_write_lock(struct request *rq); 1888 void __blk_req_zone_write_unlock(struct request *rq); 1889 1890 static inline void blk_req_zone_write_lock(struct request *rq) 1891 { 1892 if (blk_req_needs_zone_write_lock(rq)) 1893 __blk_req_zone_write_lock(rq); 1894 } 1895 1896 static inline void blk_req_zone_write_unlock(struct request *rq) 1897 { 1898 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1899 __blk_req_zone_write_unlock(rq); 1900 } 1901 1902 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1903 { 1904 return rq->q->seq_zones_wlock && 1905 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1906 } 1907 1908 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1909 { 1910 if (!blk_req_needs_zone_write_lock(rq)) 1911 return true; 1912 return !blk_req_zone_is_write_locked(rq); 1913 } 1914 #else 1915 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1916 { 1917 return false; 1918 } 1919 1920 static inline void blk_req_zone_write_lock(struct request *rq) 1921 { 1922 } 1923 1924 static inline void blk_req_zone_write_unlock(struct request *rq) 1925 { 1926 } 1927 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1928 { 1929 return false; 1930 } 1931 1932 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1933 { 1934 return true; 1935 } 1936 #endif /* CONFIG_BLK_DEV_ZONED */ 1937 1938 #else /* CONFIG_BLOCK */ 1939 1940 struct block_device; 1941 1942 /* 1943 * stubs for when the block layer is configured out 1944 */ 1945 #define buffer_heads_over_limit 0 1946 1947 static inline long nr_blockdev_pages(void) 1948 { 1949 return 0; 1950 } 1951 1952 struct blk_plug { 1953 }; 1954 1955 static inline void blk_start_plug(struct blk_plug *plug) 1956 { 1957 } 1958 1959 static inline void blk_finish_plug(struct blk_plug *plug) 1960 { 1961 } 1962 1963 static inline void blk_flush_plug(struct task_struct *task) 1964 { 1965 } 1966 1967 static inline void blk_schedule_flush_plug(struct task_struct *task) 1968 { 1969 } 1970 1971 1972 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1973 { 1974 return false; 1975 } 1976 1977 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, 1978 sector_t *error_sector) 1979 { 1980 return 0; 1981 } 1982 1983 #endif /* CONFIG_BLOCK */ 1984 1985 #endif 1986