1 #ifndef _LINUX_BLKDEV_H
2 #define _LINUX_BLKDEV_H
4 #include <linux/sched.h>
8 #include <linux/major.h>
9 #include <linux/genhd.h>
10 #include <linux/list.h>
11 #include <linux/llist.h>
12 #include <linux/timer.h>
13 #include <linux/workqueue.h>
14 #include <linux/pagemap.h>
15 #include <linux/backing-dev.h>
16 #include <linux/wait.h>
17 #include <linux/mempool.h>
18 #include <linux/bio.h>
19 #include <linux/stringify.h>
20 #include <linux/gfp.h>
21 #include <linux/bsg.h>
22 #include <linux/smp.h>
23 #include <linux/rcupdate.h>
25 #include <asm/scatterlist.h>
28 struct scsi_ioctl_command;
31 struct elevator_queue;
32 struct request_pm_state;
39 #define BLKDEV_MIN_RQ 4
40 #define BLKDEV_MAX_RQ 128 /* Default maximum */
43 * Maximum number of blkcg policies allowed to be registered concurrently.
44 * Defined here to simplify include dependency.
46 #define BLKCG_MAX_POLS 2
49 typedef void (rq_end_io_fn)(struct request *, int);
51 #define BLK_RL_SYNCFULL (1U << 0)
52 #define BLK_RL_ASYNCFULL (1U << 1)
55 struct request_queue *q; /* the queue this rl belongs to */
56 #ifdef CONFIG_BLK_CGROUP
57 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
60 * count[], starved[], and wait[] are indexed by
61 * BLK_RW_SYNC/BLK_RW_ASYNC
66 wait_queue_head_t wait[2];
71 * request command types
73 enum rq_cmd_type_bits {
74 REQ_TYPE_FS = 1, /* fs request */
75 REQ_TYPE_BLOCK_PC, /* scsi command */
76 REQ_TYPE_SENSE, /* sense request */
77 REQ_TYPE_PM_SUSPEND, /* suspend request */
78 REQ_TYPE_PM_RESUME, /* resume request */
79 REQ_TYPE_PM_SHUTDOWN, /* shutdown request */
80 REQ_TYPE_SPECIAL, /* driver defined type */
82 * for ATA/ATAPI devices. this really doesn't belong here, ide should
83 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
84 * private REQ_LB opcodes to differentiate what type of request this is
86 REQ_TYPE_ATA_TASKFILE,
90 #define BLK_MAX_CDB 16
93 * Try to put the fields that are referenced together in the same cacheline.
95 * If you modify this structure, make sure to update blk_rq_init() and
96 * especially blk_mq_rq_ctx_init() to take care of the added fields.
99 struct list_head queuelist;
101 struct call_single_data csd;
102 unsigned long fifo_time;
105 struct request_queue *q;
106 struct blk_mq_ctx *mq_ctx;
109 enum rq_cmd_type_bits cmd_type;
110 unsigned long atomic_flags;
114 /* the following two fields are internal, NEVER access directly */
115 unsigned int __data_len; /* total data len */
116 sector_t __sector; /* sector cursor */
122 * The hash is used inside the scheduler, and killed once the
123 * request reaches the dispatch list. The ipi_list is only used
124 * to queue the request for softirq completion, which is long
125 * after the request has been unhashed (and even removed from
126 * the dispatch list).
129 struct hlist_node hash; /* merge hash */
130 struct list_head ipi_list;
134 * The rb_node is only used inside the io scheduler, requests
135 * are pruned when moved to the dispatch queue. So let the
136 * completion_data share space with the rb_node.
139 struct rb_node rb_node; /* sort/lookup */
140 void *completion_data;
144 * Three pointers are available for the IO schedulers, if they need
145 * more they have to dynamically allocate it. Flush requests are
146 * never put on the IO scheduler. So let the flush fields share
147 * space with the elevator data.
157 struct list_head list;
158 rq_end_io_fn *saved_end_io;
162 struct gendisk *rq_disk;
163 struct hd_struct *part;
164 unsigned long start_time;
165 #ifdef CONFIG_BLK_CGROUP
166 struct request_list *rl; /* rl this rq is alloced from */
167 unsigned long long start_time_ns;
168 unsigned long long io_start_time_ns; /* when passed to hardware */
170 /* Number of scatter-gather DMA addr+len pairs after
171 * physical address coalescing is performed.
173 unsigned short nr_phys_segments;
174 #if defined(CONFIG_BLK_DEV_INTEGRITY)
175 unsigned short nr_integrity_segments;
178 unsigned short ioprio;
180 void *special; /* opaque pointer available for LLD use */
186 * when request is used as a packet command carrier
188 unsigned char __cmd[BLK_MAX_CDB];
190 unsigned short cmd_len;
192 unsigned int extra_len; /* length of alignment and padding */
193 unsigned int sense_len;
194 unsigned int resid_len; /* residual count */
197 unsigned long deadline;
198 struct list_head timeout_list;
199 unsigned int timeout;
203 * completion callback.
205 rq_end_io_fn *end_io;
209 struct request *next_rq;
212 static inline unsigned short req_get_ioprio(struct request *req)
218 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
219 * requests. Some step values could eventually be made generic.
221 struct request_pm_state
223 /* PM state machine step value, currently driver specific */
225 /* requested PM state value (S1, S2, S3, S4, ...) */
227 void* data; /* for driver use */
230 #include <linux/elevator.h>
232 struct blk_queue_ctx;
234 typedef void (request_fn_proc) (struct request_queue *q);
235 typedef void (make_request_fn) (struct request_queue *q, struct bio *bio);
236 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
237 typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
240 struct bvec_merge_data {
241 struct block_device *bi_bdev;
246 typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
248 typedef void (softirq_done_fn)(struct request *);
249 typedef int (dma_drain_needed_fn)(struct request *);
250 typedef int (lld_busy_fn) (struct request_queue *q);
251 typedef int (bsg_job_fn) (struct bsg_job *);
253 enum blk_eh_timer_return {
259 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
261 enum blk_queue_state {
266 struct blk_queue_tag {
267 struct request **tag_index; /* map of busy tags */
268 unsigned long *tag_map; /* bit map of free/busy tags */
269 int busy; /* current depth */
270 int max_depth; /* what we will send to device */
271 int real_max_depth; /* what the array can hold */
272 atomic_t refcnt; /* map can be shared */
275 #define BLK_SCSI_MAX_CMDS (256)
276 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
278 struct queue_limits {
279 unsigned long bounce_pfn;
280 unsigned long seg_boundary_mask;
282 unsigned int max_hw_sectors;
283 unsigned int max_sectors;
284 unsigned int max_segment_size;
285 unsigned int physical_block_size;
286 unsigned int alignment_offset;
289 unsigned int max_discard_sectors;
290 unsigned int max_write_same_sectors;
291 unsigned int discard_granularity;
292 unsigned int discard_alignment;
294 unsigned short logical_block_size;
295 unsigned short max_segments;
296 unsigned short max_integrity_segments;
298 unsigned char misaligned;
299 unsigned char discard_misaligned;
300 unsigned char cluster;
301 unsigned char discard_zeroes_data;
302 unsigned char raid_partial_stripes_expensive;
305 struct request_queue {
307 * Together with queue_head for cacheline sharing
309 struct list_head queue_head;
310 struct request *last_merge;
311 struct elevator_queue *elevator;
312 int nr_rqs[2]; /* # allocated [a]sync rqs */
313 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
316 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
317 * is used, root blkg allocates from @q->root_rl and all other
318 * blkgs from their own blkg->rl. Which one to use should be
319 * determined using bio_request_list().
321 struct request_list root_rl;
323 request_fn_proc *request_fn;
324 make_request_fn *make_request_fn;
325 prep_rq_fn *prep_rq_fn;
326 unprep_rq_fn *unprep_rq_fn;
327 merge_bvec_fn *merge_bvec_fn;
328 softirq_done_fn *softirq_done_fn;
329 rq_timed_out_fn *rq_timed_out_fn;
330 dma_drain_needed_fn *dma_drain_needed;
331 lld_busy_fn *lld_busy_fn;
333 struct blk_mq_ops *mq_ops;
335 unsigned int *mq_map;
338 struct blk_mq_ctx *queue_ctx;
339 unsigned int nr_queues;
341 /* hw dispatch queues */
342 struct blk_mq_hw_ctx **queue_hw_ctx;
343 unsigned int nr_hw_queues;
346 * Dispatch queue sorting
349 struct request *boundary_rq;
352 * Delayed queue handling
354 struct delayed_work delay_work;
356 struct backing_dev_info backing_dev_info;
359 * The queue owner gets to use this for whatever they like.
360 * ll_rw_blk doesn't touch it.
365 * various queue flags, see QUEUE_* below
367 unsigned long queue_flags;
370 * ida allocated id for this queue. Used to index queues from
376 * queue needs bounce pages for pages above this limit
381 * protects queue structures from reentrancy. ->__queue_lock should
382 * _never_ be used directly, it is queue private. always use
385 spinlock_t __queue_lock;
386 spinlock_t *queue_lock;
396 struct kobject mq_kobj;
398 #ifdef CONFIG_PM_RUNTIME
401 unsigned int nr_pending;
407 unsigned long nr_requests; /* Max # of requests */
408 unsigned int nr_congestion_on;
409 unsigned int nr_congestion_off;
410 unsigned int nr_batching;
412 unsigned int dma_drain_size;
413 void *dma_drain_buffer;
414 unsigned int dma_pad_mask;
415 unsigned int dma_alignment;
417 struct blk_queue_tag *queue_tags;
418 struct list_head tag_busy_list;
420 unsigned int nr_sorted;
421 unsigned int in_flight[2];
423 * Number of active block driver functions for which blk_drain_queue()
424 * must wait. Must be incremented around functions that unlock the
425 * queue_lock internally, e.g. scsi_request_fn().
427 unsigned int request_fn_active;
429 unsigned int rq_timeout;
430 struct timer_list timeout;
431 struct list_head timeout_list;
433 struct list_head icq_list;
434 #ifdef CONFIG_BLK_CGROUP
435 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
436 struct blkcg_gq *root_blkg;
437 struct list_head blkg_list;
440 struct queue_limits limits;
445 unsigned int sg_timeout;
446 unsigned int sg_reserved_size;
448 #ifdef CONFIG_BLK_DEV_IO_TRACE
449 struct blk_trace *blk_trace;
452 * for flush operations
454 unsigned int flush_flags;
455 unsigned int flush_not_queueable:1;
456 unsigned int flush_queue_delayed:1;
457 unsigned int flush_pending_idx:1;
458 unsigned int flush_running_idx:1;
459 unsigned long flush_pending_since;
460 struct list_head flush_queue[2];
461 struct list_head flush_data_in_flight;
462 struct request *flush_rq;
463 spinlock_t mq_flush_lock;
465 struct list_head requeue_list;
466 spinlock_t requeue_lock;
467 struct work_struct requeue_work;
469 struct mutex sysfs_lock;
473 #if defined(CONFIG_BLK_DEV_BSG)
474 bsg_job_fn *bsg_job_fn;
476 struct bsg_class_device bsg_dev;
479 #ifdef CONFIG_BLK_DEV_THROTTLING
481 struct throtl_data *td;
483 struct rcu_head rcu_head;
484 wait_queue_head_t mq_freeze_wq;
485 struct percpu_counter mq_usage_counter;
486 struct list_head all_q_node;
488 struct blk_mq_tag_set *tag_set;
489 struct list_head tag_set_list;
492 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
493 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
494 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
495 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
496 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
497 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
498 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
499 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
500 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
501 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
502 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
503 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
504 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
505 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
506 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
507 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
508 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
509 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
510 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
511 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
512 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
513 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
515 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
516 (1 << QUEUE_FLAG_STACKABLE) | \
517 (1 << QUEUE_FLAG_SAME_COMP) | \
518 (1 << QUEUE_FLAG_ADD_RANDOM))
520 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
521 (1 << QUEUE_FLAG_SAME_COMP))
523 static inline void queue_lockdep_assert_held(struct request_queue *q)
526 lockdep_assert_held(q->queue_lock);
529 static inline void queue_flag_set_unlocked(unsigned int flag,
530 struct request_queue *q)
532 __set_bit(flag, &q->queue_flags);
535 static inline int queue_flag_test_and_clear(unsigned int flag,
536 struct request_queue *q)
538 queue_lockdep_assert_held(q);
540 if (test_bit(flag, &q->queue_flags)) {
541 __clear_bit(flag, &q->queue_flags);
548 static inline int queue_flag_test_and_set(unsigned int flag,
549 struct request_queue *q)
551 queue_lockdep_assert_held(q);
553 if (!test_bit(flag, &q->queue_flags)) {
554 __set_bit(flag, &q->queue_flags);
561 static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
563 queue_lockdep_assert_held(q);
564 __set_bit(flag, &q->queue_flags);
567 static inline void queue_flag_clear_unlocked(unsigned int flag,
568 struct request_queue *q)
570 __clear_bit(flag, &q->queue_flags);
573 static inline int queue_in_flight(struct request_queue *q)
575 return q->in_flight[0] + q->in_flight[1];
578 static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
580 queue_lockdep_assert_held(q);
581 __clear_bit(flag, &q->queue_flags);
584 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
585 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
586 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
587 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
588 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
589 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
590 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
591 #define blk_queue_noxmerges(q) \
592 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
593 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
594 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
595 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
596 #define blk_queue_stackable(q) \
597 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
598 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
599 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
600 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
602 #define blk_noretry_request(rq) \
603 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
604 REQ_FAILFAST_DRIVER))
606 #define blk_account_rq(rq) \
607 (((rq)->cmd_flags & REQ_STARTED) && \
608 ((rq)->cmd_type == REQ_TYPE_FS))
610 #define blk_pm_request(rq) \
611 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
612 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
614 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
615 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
616 /* rq->queuelist of dequeued request must be list_empty() */
617 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
619 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
621 #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0)
624 * Driver can handle struct request, if it either has an old style
625 * request_fn defined, or is blk-mq based.
627 static inline bool queue_is_rq_based(struct request_queue *q)
629 return q->request_fn || q->mq_ops;
632 static inline unsigned int blk_queue_cluster(struct request_queue *q)
634 return q->limits.cluster;
638 * We regard a request as sync, if either a read or a sync write
640 static inline bool rw_is_sync(unsigned int rw_flags)
642 return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
645 static inline bool rq_is_sync(struct request *rq)
647 return rw_is_sync(rq->cmd_flags);
650 static inline bool blk_rl_full(struct request_list *rl, bool sync)
652 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
654 return rl->flags & flag;
657 static inline void blk_set_rl_full(struct request_list *rl, bool sync)
659 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
664 static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
666 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
671 static inline bool rq_mergeable(struct request *rq)
673 if (rq->cmd_type != REQ_TYPE_FS)
676 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
682 static inline bool blk_check_merge_flags(unsigned int flags1,
685 if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD))
688 if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE))
691 if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME))
697 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
699 if (bio_data(a) == bio_data(b))
706 * q->prep_rq_fn return values
708 #define BLKPREP_OK 0 /* serve it */
709 #define BLKPREP_KILL 1 /* fatal error, kill */
710 #define BLKPREP_DEFER 2 /* leave on queue */
712 extern unsigned long blk_max_low_pfn, blk_max_pfn;
715 * standard bounce addresses:
717 * BLK_BOUNCE_HIGH : bounce all highmem pages
718 * BLK_BOUNCE_ANY : don't bounce anything
719 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
722 #if BITS_PER_LONG == 32
723 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
725 #define BLK_BOUNCE_HIGH -1ULL
727 #define BLK_BOUNCE_ANY (-1ULL)
728 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
731 * default timeout for SG_IO if none specified
733 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
734 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
737 extern int init_emergency_isa_pool(void);
738 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
740 static inline int init_emergency_isa_pool(void)
744 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
747 #endif /* CONFIG_MMU */
753 unsigned long offset;
758 struct req_iterator {
759 struct bvec_iter iter;
763 /* This should not be used directly - use rq_for_each_segment */
764 #define for_each_bio(_bio) \
765 for (; _bio; _bio = _bio->bi_next)
766 #define __rq_for_each_bio(_bio, rq) \
768 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
770 #define rq_for_each_segment(bvl, _rq, _iter) \
771 __rq_for_each_bio(_iter.bio, _rq) \
772 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
774 #define rq_iter_last(bvec, _iter) \
775 (_iter.bio->bi_next == NULL && \
776 bio_iter_last(bvec, _iter.iter))
778 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
779 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
781 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
782 extern void rq_flush_dcache_pages(struct request *rq);
784 static inline void rq_flush_dcache_pages(struct request *rq)
789 extern int blk_register_queue(struct gendisk *disk);
790 extern void blk_unregister_queue(struct gendisk *disk);
791 extern void generic_make_request(struct bio *bio);
792 extern void blk_rq_init(struct request_queue *q, struct request *rq);
793 extern void blk_put_request(struct request *);
794 extern void __blk_put_request(struct request_queue *, struct request *);
795 extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
796 extern struct request *blk_make_request(struct request_queue *, struct bio *,
798 extern void blk_requeue_request(struct request_queue *, struct request *);
799 extern void blk_add_request_payload(struct request *rq, struct page *page,
801 extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
802 extern int blk_lld_busy(struct request_queue *q);
803 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
804 struct bio_set *bs, gfp_t gfp_mask,
805 int (*bio_ctr)(struct bio *, struct bio *, void *),
807 extern void blk_rq_unprep_clone(struct request *rq);
808 extern int blk_insert_cloned_request(struct request_queue *q,
810 extern void blk_delay_queue(struct request_queue *, unsigned long);
811 extern void blk_recount_segments(struct request_queue *, struct bio *);
812 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
813 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
814 unsigned int, void __user *);
815 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
816 unsigned int, void __user *);
817 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
818 struct scsi_ioctl_command __user *);
820 extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
823 * A queue has just exitted congestion. Note this in the global counter of
824 * congested queues, and wake up anyone who was waiting for requests to be
827 static inline void blk_clear_queue_congested(struct request_queue *q, int sync)
829 clear_bdi_congested(&q->backing_dev_info, sync);
833 * A queue has just entered congestion. Flag that in the queue's VM-visible
834 * state flags and increment the global gounter of congested queues.
836 static inline void blk_set_queue_congested(struct request_queue *q, int sync)
838 set_bdi_congested(&q->backing_dev_info, sync);
841 extern void blk_start_queue(struct request_queue *q);
842 extern void blk_stop_queue(struct request_queue *q);
843 extern void blk_sync_queue(struct request_queue *q);
844 extern void __blk_stop_queue(struct request_queue *q);
845 extern void __blk_run_queue(struct request_queue *q);
846 extern void blk_run_queue(struct request_queue *);
847 extern void blk_run_queue_async(struct request_queue *q);
848 extern int blk_rq_map_user(struct request_queue *, struct request *,
849 struct rq_map_data *, void __user *, unsigned long,
851 extern int blk_rq_unmap_user(struct bio *);
852 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
853 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
854 struct rq_map_data *, const struct sg_iovec *,
855 int, unsigned int, gfp_t);
856 extern int blk_execute_rq(struct request_queue *, struct gendisk *,
857 struct request *, int);
858 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
859 struct request *, int, rq_end_io_fn *);
861 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
863 return bdev->bd_disk->queue;
867 * blk_rq_pos() : the current sector
868 * blk_rq_bytes() : bytes left in the entire request
869 * blk_rq_cur_bytes() : bytes left in the current segment
870 * blk_rq_err_bytes() : bytes left till the next error boundary
871 * blk_rq_sectors() : sectors left in the entire request
872 * blk_rq_cur_sectors() : sectors left in the current segment
874 static inline sector_t blk_rq_pos(const struct request *rq)
879 static inline unsigned int blk_rq_bytes(const struct request *rq)
881 return rq->__data_len;
884 static inline int blk_rq_cur_bytes(const struct request *rq)
886 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
889 extern unsigned int blk_rq_err_bytes(const struct request *rq);
891 static inline unsigned int blk_rq_sectors(const struct request *rq)
893 return blk_rq_bytes(rq) >> 9;
896 static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
898 return blk_rq_cur_bytes(rq) >> 9;
901 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
902 unsigned int cmd_flags)
904 if (unlikely(cmd_flags & REQ_DISCARD))
905 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
907 if (unlikely(cmd_flags & REQ_WRITE_SAME))
908 return q->limits.max_write_same_sectors;
910 return q->limits.max_sectors;
913 static inline unsigned int blk_rq_get_max_sectors(struct request *rq)
915 struct request_queue *q = rq->q;
917 if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC))
918 return q->limits.max_hw_sectors;
920 return blk_queue_get_max_sectors(q, rq->cmd_flags);
923 static inline unsigned int blk_rq_count_bios(struct request *rq)
925 unsigned int nr_bios = 0;
928 __rq_for_each_bio(bio, rq)
935 * Request issue related functions.
937 extern struct request *blk_peek_request(struct request_queue *q);
938 extern void blk_start_request(struct request *rq);
939 extern struct request *blk_fetch_request(struct request_queue *q);
942 * Request completion related functions.
944 * blk_update_request() completes given number of bytes and updates
945 * the request without completing it.
947 * blk_end_request() and friends. __blk_end_request() must be called
948 * with the request queue spinlock acquired.
950 * Several drivers define their own end_request and call
951 * blk_end_request() for parts of the original function.
952 * This prevents code duplication in drivers.
954 extern bool blk_update_request(struct request *rq, int error,
955 unsigned int nr_bytes);
956 extern void blk_finish_request(struct request *rq, int error);
957 extern bool blk_end_request(struct request *rq, int error,
958 unsigned int nr_bytes);
959 extern void blk_end_request_all(struct request *rq, int error);
960 extern bool blk_end_request_cur(struct request *rq, int error);
961 extern bool blk_end_request_err(struct request *rq, int error);
962 extern bool __blk_end_request(struct request *rq, int error,
963 unsigned int nr_bytes);
964 extern void __blk_end_request_all(struct request *rq, int error);
965 extern bool __blk_end_request_cur(struct request *rq, int error);
966 extern bool __blk_end_request_err(struct request *rq, int error);
968 extern void blk_complete_request(struct request *);
969 extern void __blk_complete_request(struct request *);
970 extern void blk_abort_request(struct request *);
971 extern void blk_unprep_request(struct request *);
974 * Access functions for manipulating queue properties
976 extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
977 spinlock_t *lock, int node_id);
978 extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
979 extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
980 request_fn_proc *, spinlock_t *);
981 extern void blk_cleanup_queue(struct request_queue *);
982 extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
983 extern void blk_queue_bounce_limit(struct request_queue *, u64);
984 extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int);
985 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
986 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
987 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
988 extern void blk_queue_max_discard_sectors(struct request_queue *q,
989 unsigned int max_discard_sectors);
990 extern void blk_queue_max_write_same_sectors(struct request_queue *q,
991 unsigned int max_write_same_sectors);
992 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
993 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
994 extern void blk_queue_alignment_offset(struct request_queue *q,
995 unsigned int alignment);
996 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
997 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
998 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
999 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1000 extern void blk_set_default_limits(struct queue_limits *lim);
1001 extern void blk_set_stacking_limits(struct queue_limits *lim);
1002 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1004 extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1006 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1008 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1009 extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1010 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1011 extern int blk_queue_dma_drain(struct request_queue *q,
1012 dma_drain_needed_fn *dma_drain_needed,
1013 void *buf, unsigned int size);
1014 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1015 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1016 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1017 extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1018 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
1019 extern void blk_queue_dma_alignment(struct request_queue *, int);
1020 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1021 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1022 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1023 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1024 extern void blk_queue_flush(struct request_queue *q, unsigned int flush);
1025 extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1026 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
1028 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1029 extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio,
1030 struct scatterlist *sglist);
1031 extern void blk_dump_rq_flags(struct request *, char *);
1032 extern long nr_blockdev_pages(void);
1034 bool __must_check blk_get_queue(struct request_queue *);
1035 struct request_queue *blk_alloc_queue(gfp_t);
1036 struct request_queue *blk_alloc_queue_node(gfp_t, int);
1037 extern void blk_put_queue(struct request_queue *);
1040 * block layer runtime pm functions
1042 #ifdef CONFIG_PM_RUNTIME
1043 extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1044 extern int blk_pre_runtime_suspend(struct request_queue *q);
1045 extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1046 extern void blk_pre_runtime_resume(struct request_queue *q);
1047 extern void blk_post_runtime_resume(struct request_queue *q, int err);
1049 static inline void blk_pm_runtime_init(struct request_queue *q,
1050 struct device *dev) {}
1051 static inline int blk_pre_runtime_suspend(struct request_queue *q)
1055 static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1056 static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1057 static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
1061 * blk_plug permits building a queue of related requests by holding the I/O
1062 * fragments for a short period. This allows merging of sequential requests
1063 * into single larger request. As the requests are moved from a per-task list to
1064 * the device's request_queue in a batch, this results in improved scalability
1065 * as the lock contention for request_queue lock is reduced.
1067 * It is ok not to disable preemption when adding the request to the plug list
1068 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1069 * the plug list when the task sleeps by itself. For details, please see
1070 * schedule() where blk_schedule_flush_plug() is called.
1073 struct list_head list; /* requests */
1074 struct list_head mq_list; /* blk-mq requests */
1075 struct list_head cb_list; /* md requires an unplug callback */
1077 #define BLK_MAX_REQUEST_COUNT 16
1080 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1081 struct blk_plug_cb {
1082 struct list_head list;
1083 blk_plug_cb_fn callback;
1086 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1087 void *data, int size);
1088 extern void blk_start_plug(struct blk_plug *);
1089 extern void blk_finish_plug(struct blk_plug *);
1090 extern void blk_flush_plug_list(struct blk_plug *, bool);
1092 static inline void blk_flush_plug(struct task_struct *tsk)
1094 struct blk_plug *plug = tsk->plug;
1097 blk_flush_plug_list(plug, false);
1100 static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1102 struct blk_plug *plug = tsk->plug;
1105 blk_flush_plug_list(plug, true);
1108 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1110 struct blk_plug *plug = tsk->plug;
1113 (!list_empty(&plug->list) ||
1114 !list_empty(&plug->mq_list) ||
1115 !list_empty(&plug->cb_list));
1121 #define blk_rq_tagged(rq) \
1122 ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED))
1123 extern int blk_queue_start_tag(struct request_queue *, struct request *);
1124 extern struct request *blk_queue_find_tag(struct request_queue *, int);
1125 extern void blk_queue_end_tag(struct request_queue *, struct request *);
1126 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *);
1127 extern void blk_queue_free_tags(struct request_queue *);
1128 extern int blk_queue_resize_tags(struct request_queue *, int);
1129 extern void blk_queue_invalidate_tags(struct request_queue *);
1130 extern struct blk_queue_tag *blk_init_tags(int);
1131 extern void blk_free_tags(struct blk_queue_tag *);
1133 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1136 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1138 return bqt->tag_index[tag];
1141 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1143 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1144 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1145 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1146 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1147 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1148 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1149 sector_t nr_sects, gfp_t gfp_mask);
1150 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1151 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1153 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1154 nr_blocks << (sb->s_blocksize_bits - 9),
1157 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1158 sector_t nr_blocks, gfp_t gfp_mask)
1160 return blkdev_issue_zeroout(sb->s_bdev,
1161 block << (sb->s_blocksize_bits - 9),
1162 nr_blocks << (sb->s_blocksize_bits - 9),
1166 extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
1168 enum blk_default_limits {
1169 BLK_MAX_SEGMENTS = 128,
1170 BLK_SAFE_MAX_SECTORS = 255,
1171 BLK_DEF_MAX_SECTORS = 1024,
1172 BLK_MAX_SEGMENT_SIZE = 65536,
1173 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1176 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1178 static inline unsigned long queue_bounce_pfn(struct request_queue *q)
1180 return q->limits.bounce_pfn;
1183 static inline unsigned long queue_segment_boundary(struct request_queue *q)
1185 return q->limits.seg_boundary_mask;
1188 static inline unsigned int queue_max_sectors(struct request_queue *q)
1190 return q->limits.max_sectors;
1193 static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1195 return q->limits.max_hw_sectors;
1198 static inline unsigned short queue_max_segments(struct request_queue *q)
1200 return q->limits.max_segments;
1203 static inline unsigned int queue_max_segment_size(struct request_queue *q)
1205 return q->limits.max_segment_size;
1208 static inline unsigned short queue_logical_block_size(struct request_queue *q)
1212 if (q && q->limits.logical_block_size)
1213 retval = q->limits.logical_block_size;
1218 static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1220 return queue_logical_block_size(bdev_get_queue(bdev));
1223 static inline unsigned int queue_physical_block_size(struct request_queue *q)
1225 return q->limits.physical_block_size;
1228 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1230 return queue_physical_block_size(bdev_get_queue(bdev));
1233 static inline unsigned int queue_io_min(struct request_queue *q)
1235 return q->limits.io_min;
1238 static inline int bdev_io_min(struct block_device *bdev)
1240 return queue_io_min(bdev_get_queue(bdev));
1243 static inline unsigned int queue_io_opt(struct request_queue *q)
1245 return q->limits.io_opt;
1248 static inline int bdev_io_opt(struct block_device *bdev)
1250 return queue_io_opt(bdev_get_queue(bdev));
1253 static inline int queue_alignment_offset(struct request_queue *q)
1255 if (q->limits.misaligned)
1258 return q->limits.alignment_offset;
1261 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1263 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1264 unsigned int alignment = (sector << 9) & (granularity - 1);
1266 return (granularity + lim->alignment_offset - alignment)
1267 & (granularity - 1);
1270 static inline int bdev_alignment_offset(struct block_device *bdev)
1272 struct request_queue *q = bdev_get_queue(bdev);
1274 if (q->limits.misaligned)
1277 if (bdev != bdev->bd_contains)
1278 return bdev->bd_part->alignment_offset;
1280 return q->limits.alignment_offset;
1283 static inline int queue_discard_alignment(struct request_queue *q)
1285 if (q->limits.discard_misaligned)
1288 return q->limits.discard_alignment;
1291 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1293 unsigned int alignment, granularity, offset;
1295 if (!lim->max_discard_sectors)
1298 /* Why are these in bytes, not sectors? */
1299 alignment = lim->discard_alignment >> 9;
1300 granularity = lim->discard_granularity >> 9;
1304 /* Offset of the partition start in 'granularity' sectors */
1305 offset = sector_div(sector, granularity);
1307 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1308 offset = (granularity + alignment - offset) % granularity;
1310 /* Turn it back into bytes, gaah */
1314 static inline int bdev_discard_alignment(struct block_device *bdev)
1316 struct request_queue *q = bdev_get_queue(bdev);
1318 if (bdev != bdev->bd_contains)
1319 return bdev->bd_part->discard_alignment;
1321 return q->limits.discard_alignment;
1324 static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
1326 if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1)
1332 static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
1334 return queue_discard_zeroes_data(bdev_get_queue(bdev));
1337 static inline unsigned int bdev_write_same(struct block_device *bdev)
1339 struct request_queue *q = bdev_get_queue(bdev);
1342 return q->limits.max_write_same_sectors;
1347 static inline int queue_dma_alignment(struct request_queue *q)
1349 return q ? q->dma_alignment : 511;
1352 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1355 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1356 return !(addr & alignment) && !(len & alignment);
1359 /* assumes size > 256 */
1360 static inline unsigned int blksize_bits(unsigned int size)
1362 unsigned int bits = 8;
1366 } while (size > 256);
1370 static inline unsigned int block_size(struct block_device *bdev)
1372 return bdev->bd_block_size;
1375 static inline bool queue_flush_queueable(struct request_queue *q)
1377 return !q->flush_not_queueable;
1380 typedef struct {struct page *v;} Sector;
1382 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1384 static inline void put_dev_sector(Sector p)
1386 page_cache_release(p.v);
1390 int kblockd_schedule_work(struct work_struct *work);
1391 int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
1392 int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1394 #ifdef CONFIG_BLK_CGROUP
1396 * This should not be using sched_clock(). A real patch is in progress
1397 * to fix this up, until that is in place we need to disable preemption
1398 * around sched_clock() in this function and set_io_start_time_ns().
1400 static inline void set_start_time_ns(struct request *req)
1403 req->start_time_ns = sched_clock();
1407 static inline void set_io_start_time_ns(struct request *req)
1410 req->io_start_time_ns = sched_clock();
1414 static inline uint64_t rq_start_time_ns(struct request *req)
1416 return req->start_time_ns;
1419 static inline uint64_t rq_io_start_time_ns(struct request *req)
1421 return req->io_start_time_ns;
1424 static inline void set_start_time_ns(struct request *req) {}
1425 static inline void set_io_start_time_ns(struct request *req) {}
1426 static inline uint64_t rq_start_time_ns(struct request *req)
1430 static inline uint64_t rq_io_start_time_ns(struct request *req)
1436 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1437 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1438 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1439 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1441 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1443 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1444 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1446 struct blk_integrity_exchg {
1450 unsigned int data_size;
1451 unsigned short sector_size;
1452 const char *disk_name;
1455 typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
1456 typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
1457 typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
1458 typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
1460 struct blk_integrity {
1461 integrity_gen_fn *generate_fn;
1462 integrity_vrfy_fn *verify_fn;
1463 integrity_set_tag_fn *set_tag_fn;
1464 integrity_get_tag_fn *get_tag_fn;
1466 unsigned short flags;
1467 unsigned short tuple_size;
1468 unsigned short sector_size;
1469 unsigned short tag_size;
1473 struct kobject kobj;
1476 extern bool blk_integrity_is_initialized(struct gendisk *);
1477 extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
1478 extern void blk_integrity_unregister(struct gendisk *);
1479 extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1480 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1481 struct scatterlist *);
1482 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1483 extern int blk_integrity_merge_rq(struct request_queue *, struct request *,
1485 extern int blk_integrity_merge_bio(struct request_queue *, struct request *,
1489 struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1491 return bdev->bd_disk->integrity;
1494 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1496 return disk->integrity;
1499 static inline int blk_integrity_rq(struct request *rq)
1501 if (rq->bio == NULL)
1504 return bio_integrity(rq->bio);
1507 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1510 q->limits.max_integrity_segments = segs;
1513 static inline unsigned short
1514 queue_max_integrity_segments(struct request_queue *q)
1516 return q->limits.max_integrity_segments;
1519 #else /* CONFIG_BLK_DEV_INTEGRITY */
1522 struct block_device;
1524 struct blk_integrity;
1526 static inline int blk_integrity_rq(struct request *rq)
1530 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1535 static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1537 struct scatterlist *s)
1541 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1545 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1549 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1553 static inline int blk_integrity_register(struct gendisk *d,
1554 struct blk_integrity *b)
1558 static inline void blk_integrity_unregister(struct gendisk *d)
1561 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1565 static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1569 static inline int blk_integrity_merge_rq(struct request_queue *rq,
1575 static inline int blk_integrity_merge_bio(struct request_queue *rq,
1581 static inline bool blk_integrity_is_initialized(struct gendisk *g)
1586 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1588 struct block_device_operations {
1589 int (*open) (struct block_device *, fmode_t);
1590 void (*release) (struct gendisk *, fmode_t);
1591 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1592 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1593 int (*direct_access) (struct block_device *, sector_t,
1594 void **, unsigned long *);
1595 unsigned int (*check_events) (struct gendisk *disk,
1596 unsigned int clearing);
1597 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1598 int (*media_changed) (struct gendisk *);
1599 void (*unlock_native_capacity) (struct gendisk *);
1600 int (*revalidate_disk) (struct gendisk *);
1601 int (*getgeo)(struct block_device *, struct hd_geometry *);
1602 /* this callback is with swap_lock and sometimes page table lock held */
1603 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1604 struct module *owner;
1607 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1609 #else /* CONFIG_BLOCK */
1611 * stubs for when the block layer is configured out
1613 #define buffer_heads_over_limit 0
1615 static inline long nr_blockdev_pages(void)
1623 static inline void blk_start_plug(struct blk_plug *plug)
1627 static inline void blk_finish_plug(struct blk_plug *plug)
1631 static inline void blk_flush_plug(struct task_struct *task)
1635 static inline void blk_schedule_flush_plug(struct task_struct *task)
1640 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1645 #endif /* CONFIG_BLOCK */