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-defs.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>
24 #include <linux/percpu-refcount.h>
25 #include <linux/scatterlist.h>
28 struct scsi_ioctl_command
;
31 struct elevator_queue
;
37 struct blk_flush_queue
;
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_DRV_PRIV
, /* driver defined types from here */
79 #define BLK_MAX_CDB 16
82 * Try to put the fields that are referenced together in the same cacheline.
84 * If you modify this structure, make sure to update blk_rq_init() and
85 * especially blk_mq_rq_ctx_init() to take care of the added fields.
88 struct list_head queuelist
;
90 struct call_single_data csd
;
91 unsigned long fifo_time
;
94 struct request_queue
*q
;
95 struct blk_mq_ctx
*mq_ctx
;
99 unsigned long atomic_flags
;
103 /* the following two fields are internal, NEVER access directly */
104 unsigned int __data_len
; /* total data len */
105 sector_t __sector
; /* sector cursor */
111 * The hash is used inside the scheduler, and killed once the
112 * request reaches the dispatch list. The ipi_list is only used
113 * to queue the request for softirq completion, which is long
114 * after the request has been unhashed (and even removed from
115 * the dispatch list).
118 struct hlist_node hash
; /* merge hash */
119 struct list_head ipi_list
;
123 * The rb_node is only used inside the io scheduler, requests
124 * are pruned when moved to the dispatch queue. So let the
125 * completion_data share space with the rb_node.
128 struct rb_node rb_node
; /* sort/lookup */
129 void *completion_data
;
133 * Three pointers are available for the IO schedulers, if they need
134 * more they have to dynamically allocate it. Flush requests are
135 * never put on the IO scheduler. So let the flush fields share
136 * space with the elevator data.
146 struct list_head list
;
147 rq_end_io_fn
*saved_end_io
;
151 struct gendisk
*rq_disk
;
152 struct hd_struct
*part
;
153 unsigned long start_time
;
154 #ifdef CONFIG_BLK_CGROUP
155 struct request_list
*rl
; /* rl this rq is alloced from */
156 unsigned long long start_time_ns
;
157 unsigned long long io_start_time_ns
; /* when passed to hardware */
159 /* Number of scatter-gather DMA addr+len pairs after
160 * physical address coalescing is performed.
162 unsigned short nr_phys_segments
;
163 #if defined(CONFIG_BLK_DEV_INTEGRITY)
164 unsigned short nr_integrity_segments
;
167 unsigned short ioprio
;
169 void *special
; /* opaque pointer available for LLD use */
175 * when request is used as a packet command carrier
177 unsigned char __cmd
[BLK_MAX_CDB
];
179 unsigned short cmd_len
;
181 unsigned int extra_len
; /* length of alignment and padding */
182 unsigned int sense_len
;
183 unsigned int resid_len
; /* residual count */
186 unsigned long deadline
;
187 struct list_head timeout_list
;
188 unsigned int timeout
;
192 * completion callback.
194 rq_end_io_fn
*end_io
;
198 struct request
*next_rq
;
201 static inline unsigned short req_get_ioprio(struct request
*req
)
206 #include <linux/elevator.h>
208 struct blk_queue_ctx
;
210 typedef void (request_fn_proc
) (struct request_queue
*q
);
211 typedef void (make_request_fn
) (struct request_queue
*q
, struct bio
*bio
);
212 typedef int (prep_rq_fn
) (struct request_queue
*, struct request
*);
213 typedef void (unprep_rq_fn
) (struct request_queue
*, struct request
*);
216 typedef void (softirq_done_fn
)(struct request
*);
217 typedef int (dma_drain_needed_fn
)(struct request
*);
218 typedef int (lld_busy_fn
) (struct request_queue
*q
);
219 typedef int (bsg_job_fn
) (struct bsg_job
*);
221 enum blk_eh_timer_return
{
227 typedef enum blk_eh_timer_return (rq_timed_out_fn
)(struct request
*);
229 enum blk_queue_state
{
234 struct blk_queue_tag
{
235 struct request
**tag_index
; /* map of busy tags */
236 unsigned long *tag_map
; /* bit map of free/busy tags */
237 int busy
; /* current depth */
238 int max_depth
; /* what we will send to device */
239 int real_max_depth
; /* what the array can hold */
240 atomic_t refcnt
; /* map can be shared */
241 int alloc_policy
; /* tag allocation policy */
242 int next_tag
; /* next tag */
244 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
245 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
247 #define BLK_SCSI_MAX_CMDS (256)
248 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
250 struct queue_limits
{
251 unsigned long bounce_pfn
;
252 unsigned long seg_boundary_mask
;
253 unsigned long virt_boundary_mask
;
255 unsigned int max_hw_sectors
;
256 unsigned int chunk_sectors
;
257 unsigned int max_sectors
;
258 unsigned int max_segment_size
;
259 unsigned int physical_block_size
;
260 unsigned int alignment_offset
;
263 unsigned int max_discard_sectors
;
264 unsigned int max_hw_discard_sectors
;
265 unsigned int max_write_same_sectors
;
266 unsigned int discard_granularity
;
267 unsigned int discard_alignment
;
269 unsigned short logical_block_size
;
270 unsigned short max_segments
;
271 unsigned short max_integrity_segments
;
273 unsigned char misaligned
;
274 unsigned char discard_misaligned
;
275 unsigned char cluster
;
276 unsigned char discard_zeroes_data
;
277 unsigned char raid_partial_stripes_expensive
;
280 struct request_queue
{
282 * Together with queue_head for cacheline sharing
284 struct list_head queue_head
;
285 struct request
*last_merge
;
286 struct elevator_queue
*elevator
;
287 int nr_rqs
[2]; /* # allocated [a]sync rqs */
288 int nr_rqs_elvpriv
; /* # allocated rqs w/ elvpriv */
291 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
292 * is used, root blkg allocates from @q->root_rl and all other
293 * blkgs from their own blkg->rl. Which one to use should be
294 * determined using bio_request_list().
296 struct request_list root_rl
;
298 request_fn_proc
*request_fn
;
299 make_request_fn
*make_request_fn
;
300 prep_rq_fn
*prep_rq_fn
;
301 unprep_rq_fn
*unprep_rq_fn
;
302 softirq_done_fn
*softirq_done_fn
;
303 rq_timed_out_fn
*rq_timed_out_fn
;
304 dma_drain_needed_fn
*dma_drain_needed
;
305 lld_busy_fn
*lld_busy_fn
;
307 struct blk_mq_ops
*mq_ops
;
309 unsigned int *mq_map
;
312 struct blk_mq_ctx __percpu
*queue_ctx
;
313 unsigned int nr_queues
;
315 /* hw dispatch queues */
316 struct blk_mq_hw_ctx
**queue_hw_ctx
;
317 unsigned int nr_hw_queues
;
320 * Dispatch queue sorting
323 struct request
*boundary_rq
;
326 * Delayed queue handling
328 struct delayed_work delay_work
;
330 struct backing_dev_info backing_dev_info
;
333 * The queue owner gets to use this for whatever they like.
334 * ll_rw_blk doesn't touch it.
339 * various queue flags, see QUEUE_* below
341 unsigned long queue_flags
;
344 * ida allocated id for this queue. Used to index queues from
350 * queue needs bounce pages for pages above this limit
355 * protects queue structures from reentrancy. ->__queue_lock should
356 * _never_ be used directly, it is queue private. always use
359 spinlock_t __queue_lock
;
360 spinlock_t
*queue_lock
;
370 struct kobject mq_kobj
;
372 #ifdef CONFIG_BLK_DEV_INTEGRITY
373 struct blk_integrity integrity
;
374 #endif /* CONFIG_BLK_DEV_INTEGRITY */
379 unsigned int nr_pending
;
385 unsigned long nr_requests
; /* Max # of requests */
386 unsigned int nr_congestion_on
;
387 unsigned int nr_congestion_off
;
388 unsigned int nr_batching
;
390 unsigned int dma_drain_size
;
391 void *dma_drain_buffer
;
392 unsigned int dma_pad_mask
;
393 unsigned int dma_alignment
;
395 struct blk_queue_tag
*queue_tags
;
396 struct list_head tag_busy_list
;
398 unsigned int nr_sorted
;
399 unsigned int in_flight
[2];
401 * Number of active block driver functions for which blk_drain_queue()
402 * must wait. Must be incremented around functions that unlock the
403 * queue_lock internally, e.g. scsi_request_fn().
405 unsigned int request_fn_active
;
407 unsigned int rq_timeout
;
408 struct timer_list timeout
;
409 struct list_head timeout_list
;
411 struct list_head icq_list
;
412 #ifdef CONFIG_BLK_CGROUP
413 DECLARE_BITMAP (blkcg_pols
, BLKCG_MAX_POLS
);
414 struct blkcg_gq
*root_blkg
;
415 struct list_head blkg_list
;
418 struct queue_limits limits
;
423 unsigned int sg_timeout
;
424 unsigned int sg_reserved_size
;
426 #ifdef CONFIG_BLK_DEV_IO_TRACE
427 struct blk_trace
*blk_trace
;
430 * for flush operations
432 unsigned int flush_flags
;
433 unsigned int flush_not_queueable
:1;
434 struct blk_flush_queue
*fq
;
436 struct list_head requeue_list
;
437 spinlock_t requeue_lock
;
438 struct work_struct requeue_work
;
440 struct mutex sysfs_lock
;
443 atomic_t mq_freeze_depth
;
445 #if defined(CONFIG_BLK_DEV_BSG)
446 bsg_job_fn
*bsg_job_fn
;
448 struct bsg_class_device bsg_dev
;
451 #ifdef CONFIG_BLK_DEV_THROTTLING
453 struct throtl_data
*td
;
455 struct rcu_head rcu_head
;
456 wait_queue_head_t mq_freeze_wq
;
457 struct percpu_ref q_usage_counter
;
458 struct list_head all_q_node
;
460 struct blk_mq_tag_set
*tag_set
;
461 struct list_head tag_set_list
;
462 struct bio_set
*bio_split
;
464 bool mq_sysfs_init_done
;
467 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
468 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
469 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
470 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
471 #define QUEUE_FLAG_DYING 5 /* queue being torn down */
472 #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
473 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
474 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
475 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
476 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
477 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
478 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
479 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
480 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
481 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
482 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
483 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
484 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
485 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
486 #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
487 #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
488 #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
490 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
491 (1 << QUEUE_FLAG_STACKABLE) | \
492 (1 << QUEUE_FLAG_SAME_COMP) | \
493 (1 << QUEUE_FLAG_ADD_RANDOM))
495 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
496 (1 << QUEUE_FLAG_STACKABLE) | \
497 (1 << QUEUE_FLAG_SAME_COMP))
499 static inline void queue_lockdep_assert_held(struct request_queue
*q
)
502 lockdep_assert_held(q
->queue_lock
);
505 static inline void queue_flag_set_unlocked(unsigned int flag
,
506 struct request_queue
*q
)
508 __set_bit(flag
, &q
->queue_flags
);
511 static inline int queue_flag_test_and_clear(unsigned int flag
,
512 struct request_queue
*q
)
514 queue_lockdep_assert_held(q
);
516 if (test_bit(flag
, &q
->queue_flags
)) {
517 __clear_bit(flag
, &q
->queue_flags
);
524 static inline int queue_flag_test_and_set(unsigned int flag
,
525 struct request_queue
*q
)
527 queue_lockdep_assert_held(q
);
529 if (!test_bit(flag
, &q
->queue_flags
)) {
530 __set_bit(flag
, &q
->queue_flags
);
537 static inline void queue_flag_set(unsigned int flag
, struct request_queue
*q
)
539 queue_lockdep_assert_held(q
);
540 __set_bit(flag
, &q
->queue_flags
);
543 static inline void queue_flag_clear_unlocked(unsigned int flag
,
544 struct request_queue
*q
)
546 __clear_bit(flag
, &q
->queue_flags
);
549 static inline int queue_in_flight(struct request_queue
*q
)
551 return q
->in_flight
[0] + q
->in_flight
[1];
554 static inline void queue_flag_clear(unsigned int flag
, struct request_queue
*q
)
556 queue_lockdep_assert_held(q
);
557 __clear_bit(flag
, &q
->queue_flags
);
560 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
561 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
562 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
563 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
564 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
565 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
566 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
567 #define blk_queue_noxmerges(q) \
568 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
569 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
570 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
571 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
572 #define blk_queue_stackable(q) \
573 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
574 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
575 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
576 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
578 #define blk_noretry_request(rq) \
579 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
580 REQ_FAILFAST_DRIVER))
582 #define blk_account_rq(rq) \
583 (((rq)->cmd_flags & REQ_STARTED) && \
584 ((rq)->cmd_type == REQ_TYPE_FS))
586 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
587 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
588 /* rq->queuelist of dequeued request must be list_empty() */
589 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
591 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
593 #define rq_data_dir(rq) ((int)((rq)->cmd_flags & 1))
596 * Driver can handle struct request, if it either has an old style
597 * request_fn defined, or is blk-mq based.
599 static inline bool queue_is_rq_based(struct request_queue
*q
)
601 return q
->request_fn
|| q
->mq_ops
;
604 static inline unsigned int blk_queue_cluster(struct request_queue
*q
)
606 return q
->limits
.cluster
;
610 * We regard a request as sync, if either a read or a sync write
612 static inline bool rw_is_sync(unsigned int rw_flags
)
614 return !(rw_flags
& REQ_WRITE
) || (rw_flags
& REQ_SYNC
);
617 static inline bool rq_is_sync(struct request
*rq
)
619 return rw_is_sync(rq
->cmd_flags
);
622 static inline bool blk_rl_full(struct request_list
*rl
, bool sync
)
624 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
626 return rl
->flags
& flag
;
629 static inline void blk_set_rl_full(struct request_list
*rl
, bool sync
)
631 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
636 static inline void blk_clear_rl_full(struct request_list
*rl
, bool sync
)
638 unsigned int flag
= sync
? BLK_RL_SYNCFULL
: BLK_RL_ASYNCFULL
;
643 static inline bool rq_mergeable(struct request
*rq
)
645 if (rq
->cmd_type
!= REQ_TYPE_FS
)
648 if (rq
->cmd_flags
& REQ_NOMERGE_FLAGS
)
654 static inline bool blk_check_merge_flags(unsigned int flags1
,
657 if ((flags1
& REQ_DISCARD
) != (flags2
& REQ_DISCARD
))
660 if ((flags1
& REQ_SECURE
) != (flags2
& REQ_SECURE
))
663 if ((flags1
& REQ_WRITE_SAME
) != (flags2
& REQ_WRITE_SAME
))
669 static inline bool blk_write_same_mergeable(struct bio
*a
, struct bio
*b
)
671 if (bio_data(a
) == bio_data(b
))
678 * q->prep_rq_fn return values
680 #define BLKPREP_OK 0 /* serve it */
681 #define BLKPREP_KILL 1 /* fatal error, kill */
682 #define BLKPREP_DEFER 2 /* leave on queue */
684 extern unsigned long blk_max_low_pfn
, blk_max_pfn
;
687 * standard bounce addresses:
689 * BLK_BOUNCE_HIGH : bounce all highmem pages
690 * BLK_BOUNCE_ANY : don't bounce anything
691 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
694 #if BITS_PER_LONG == 32
695 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
697 #define BLK_BOUNCE_HIGH -1ULL
699 #define BLK_BOUNCE_ANY (-1ULL)
700 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
703 * default timeout for SG_IO if none specified
705 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
706 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
709 extern int init_emergency_isa_pool(void);
710 extern void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
);
712 static inline int init_emergency_isa_pool(void)
716 static inline void blk_queue_bounce(struct request_queue
*q
, struct bio
**bio
)
719 #endif /* CONFIG_MMU */
725 unsigned long offset
;
730 struct req_iterator
{
731 struct bvec_iter iter
;
735 /* This should not be used directly - use rq_for_each_segment */
736 #define for_each_bio(_bio) \
737 for (; _bio; _bio = _bio->bi_next)
738 #define __rq_for_each_bio(_bio, rq) \
740 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
742 #define rq_for_each_segment(bvl, _rq, _iter) \
743 __rq_for_each_bio(_iter.bio, _rq) \
744 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
746 #define rq_iter_last(bvec, _iter) \
747 (_iter.bio->bi_next == NULL && \
748 bio_iter_last(bvec, _iter.iter))
750 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
751 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
753 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
754 extern void rq_flush_dcache_pages(struct request
*rq
);
756 static inline void rq_flush_dcache_pages(struct request
*rq
)
761 extern int blk_register_queue(struct gendisk
*disk
);
762 extern void blk_unregister_queue(struct gendisk
*disk
);
763 extern void generic_make_request(struct bio
*bio
);
764 extern void blk_rq_init(struct request_queue
*q
, struct request
*rq
);
765 extern void blk_put_request(struct request
*);
766 extern void __blk_put_request(struct request_queue
*, struct request
*);
767 extern struct request
*blk_get_request(struct request_queue
*, int, gfp_t
);
768 extern struct request
*blk_make_request(struct request_queue
*, struct bio
*,
770 extern void blk_rq_set_block_pc(struct request
*);
771 extern void blk_requeue_request(struct request_queue
*, struct request
*);
772 extern void blk_add_request_payload(struct request
*rq
, struct page
*page
,
774 extern int blk_rq_check_limits(struct request_queue
*q
, struct request
*rq
);
775 extern int blk_lld_busy(struct request_queue
*q
);
776 extern int blk_rq_prep_clone(struct request
*rq
, struct request
*rq_src
,
777 struct bio_set
*bs
, gfp_t gfp_mask
,
778 int (*bio_ctr
)(struct bio
*, struct bio
*, void *),
780 extern void blk_rq_unprep_clone(struct request
*rq
);
781 extern int blk_insert_cloned_request(struct request_queue
*q
,
783 extern void blk_delay_queue(struct request_queue
*, unsigned long);
784 extern void blk_queue_split(struct request_queue
*, struct bio
**,
786 extern void blk_recount_segments(struct request_queue
*, struct bio
*);
787 extern int scsi_verify_blk_ioctl(struct block_device
*, unsigned int);
788 extern int scsi_cmd_blk_ioctl(struct block_device
*, fmode_t
,
789 unsigned int, void __user
*);
790 extern int scsi_cmd_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
791 unsigned int, void __user
*);
792 extern int sg_scsi_ioctl(struct request_queue
*, struct gendisk
*, fmode_t
,
793 struct scsi_ioctl_command __user
*);
795 extern void blk_start_queue(struct request_queue
*q
);
796 extern void blk_stop_queue(struct request_queue
*q
);
797 extern void blk_sync_queue(struct request_queue
*q
);
798 extern void __blk_stop_queue(struct request_queue
*q
);
799 extern void __blk_run_queue(struct request_queue
*q
);
800 extern void __blk_run_queue_uncond(struct request_queue
*q
);
801 extern void blk_run_queue(struct request_queue
*);
802 extern void blk_run_queue_async(struct request_queue
*q
);
803 extern int blk_rq_map_user(struct request_queue
*, struct request
*,
804 struct rq_map_data
*, void __user
*, unsigned long,
806 extern int blk_rq_unmap_user(struct bio
*);
807 extern int blk_rq_map_kern(struct request_queue
*, struct request
*, void *, unsigned int, gfp_t
);
808 extern int blk_rq_map_user_iov(struct request_queue
*, struct request
*,
809 struct rq_map_data
*, const struct iov_iter
*,
811 extern int blk_execute_rq(struct request_queue
*, struct gendisk
*,
812 struct request
*, int);
813 extern void blk_execute_rq_nowait(struct request_queue
*, struct gendisk
*,
814 struct request
*, int, rq_end_io_fn
*);
816 static inline struct request_queue
*bdev_get_queue(struct block_device
*bdev
)
818 return bdev
->bd_disk
->queue
; /* this is never NULL */
822 * blk_rq_pos() : the current sector
823 * blk_rq_bytes() : bytes left in the entire request
824 * blk_rq_cur_bytes() : bytes left in the current segment
825 * blk_rq_err_bytes() : bytes left till the next error boundary
826 * blk_rq_sectors() : sectors left in the entire request
827 * blk_rq_cur_sectors() : sectors left in the current segment
829 static inline sector_t
blk_rq_pos(const struct request
*rq
)
834 static inline unsigned int blk_rq_bytes(const struct request
*rq
)
836 return rq
->__data_len
;
839 static inline int blk_rq_cur_bytes(const struct request
*rq
)
841 return rq
->bio
? bio_cur_bytes(rq
->bio
) : 0;
844 extern unsigned int blk_rq_err_bytes(const struct request
*rq
);
846 static inline unsigned int blk_rq_sectors(const struct request
*rq
)
848 return blk_rq_bytes(rq
) >> 9;
851 static inline unsigned int blk_rq_cur_sectors(const struct request
*rq
)
853 return blk_rq_cur_bytes(rq
) >> 9;
856 static inline unsigned int blk_queue_get_max_sectors(struct request_queue
*q
,
857 unsigned int cmd_flags
)
859 if (unlikely(cmd_flags
& REQ_DISCARD
))
860 return min(q
->limits
.max_discard_sectors
, UINT_MAX
>> 9);
862 if (unlikely(cmd_flags
& REQ_WRITE_SAME
))
863 return q
->limits
.max_write_same_sectors
;
865 return q
->limits
.max_sectors
;
869 * Return maximum size of a request at given offset. Only valid for
870 * file system requests.
872 static inline unsigned int blk_max_size_offset(struct request_queue
*q
,
875 if (!q
->limits
.chunk_sectors
)
876 return q
->limits
.max_sectors
;
878 return q
->limits
.chunk_sectors
-
879 (offset
& (q
->limits
.chunk_sectors
- 1));
882 static inline unsigned int blk_rq_get_max_sectors(struct request
*rq
)
884 struct request_queue
*q
= rq
->q
;
886 if (unlikely(rq
->cmd_type
== REQ_TYPE_BLOCK_PC
))
887 return q
->limits
.max_hw_sectors
;
889 if (!q
->limits
.chunk_sectors
|| (rq
->cmd_flags
& REQ_DISCARD
))
890 return blk_queue_get_max_sectors(q
, rq
->cmd_flags
);
892 return min(blk_max_size_offset(q
, blk_rq_pos(rq
)),
893 blk_queue_get_max_sectors(q
, rq
->cmd_flags
));
896 static inline unsigned int blk_rq_count_bios(struct request
*rq
)
898 unsigned int nr_bios
= 0;
901 __rq_for_each_bio(bio
, rq
)
908 * Request issue related functions.
910 extern struct request
*blk_peek_request(struct request_queue
*q
);
911 extern void blk_start_request(struct request
*rq
);
912 extern struct request
*blk_fetch_request(struct request_queue
*q
);
915 * Request completion related functions.
917 * blk_update_request() completes given number of bytes and updates
918 * the request without completing it.
920 * blk_end_request() and friends. __blk_end_request() must be called
921 * with the request queue spinlock acquired.
923 * Several drivers define their own end_request and call
924 * blk_end_request() for parts of the original function.
925 * This prevents code duplication in drivers.
927 extern bool blk_update_request(struct request
*rq
, int error
,
928 unsigned int nr_bytes
);
929 extern void blk_finish_request(struct request
*rq
, int error
);
930 extern bool blk_end_request(struct request
*rq
, int error
,
931 unsigned int nr_bytes
);
932 extern void blk_end_request_all(struct request
*rq
, int error
);
933 extern bool blk_end_request_cur(struct request
*rq
, int error
);
934 extern bool blk_end_request_err(struct request
*rq
, int error
);
935 extern bool __blk_end_request(struct request
*rq
, int error
,
936 unsigned int nr_bytes
);
937 extern void __blk_end_request_all(struct request
*rq
, int error
);
938 extern bool __blk_end_request_cur(struct request
*rq
, int error
);
939 extern bool __blk_end_request_err(struct request
*rq
, int error
);
941 extern void blk_complete_request(struct request
*);
942 extern void __blk_complete_request(struct request
*);
943 extern void blk_abort_request(struct request
*);
944 extern void blk_unprep_request(struct request
*);
947 * Access functions for manipulating queue properties
949 extern struct request_queue
*blk_init_queue_node(request_fn_proc
*rfn
,
950 spinlock_t
*lock
, int node_id
);
951 extern struct request_queue
*blk_init_queue(request_fn_proc
*, spinlock_t
*);
952 extern struct request_queue
*blk_init_allocated_queue(struct request_queue
*,
953 request_fn_proc
*, spinlock_t
*);
954 extern void blk_cleanup_queue(struct request_queue
*);
955 extern void blk_queue_make_request(struct request_queue
*, make_request_fn
*);
956 extern void blk_queue_bounce_limit(struct request_queue
*, u64
);
957 extern void blk_limits_max_hw_sectors(struct queue_limits
*, unsigned int);
958 extern void blk_queue_max_hw_sectors(struct request_queue
*, unsigned int);
959 extern void blk_queue_chunk_sectors(struct request_queue
*, unsigned int);
960 extern void blk_queue_max_segments(struct request_queue
*, unsigned short);
961 extern void blk_queue_max_segment_size(struct request_queue
*, unsigned int);
962 extern void blk_queue_max_discard_sectors(struct request_queue
*q
,
963 unsigned int max_discard_sectors
);
964 extern void blk_queue_max_write_same_sectors(struct request_queue
*q
,
965 unsigned int max_write_same_sectors
);
966 extern void blk_queue_logical_block_size(struct request_queue
*, unsigned short);
967 extern void blk_queue_physical_block_size(struct request_queue
*, unsigned int);
968 extern void blk_queue_alignment_offset(struct request_queue
*q
,
969 unsigned int alignment
);
970 extern void blk_limits_io_min(struct queue_limits
*limits
, unsigned int min
);
971 extern void blk_queue_io_min(struct request_queue
*q
, unsigned int min
);
972 extern void blk_limits_io_opt(struct queue_limits
*limits
, unsigned int opt
);
973 extern void blk_queue_io_opt(struct request_queue
*q
, unsigned int opt
);
974 extern void blk_set_default_limits(struct queue_limits
*lim
);
975 extern void blk_set_stacking_limits(struct queue_limits
*lim
);
976 extern int blk_stack_limits(struct queue_limits
*t
, struct queue_limits
*b
,
978 extern int bdev_stack_limits(struct queue_limits
*t
, struct block_device
*bdev
,
980 extern void disk_stack_limits(struct gendisk
*disk
, struct block_device
*bdev
,
982 extern void blk_queue_stack_limits(struct request_queue
*t
, struct request_queue
*b
);
983 extern void blk_queue_dma_pad(struct request_queue
*, unsigned int);
984 extern void blk_queue_update_dma_pad(struct request_queue
*, unsigned int);
985 extern int blk_queue_dma_drain(struct request_queue
*q
,
986 dma_drain_needed_fn
*dma_drain_needed
,
987 void *buf
, unsigned int size
);
988 extern void blk_queue_lld_busy(struct request_queue
*q
, lld_busy_fn
*fn
);
989 extern void blk_queue_segment_boundary(struct request_queue
*, unsigned long);
990 extern void blk_queue_virt_boundary(struct request_queue
*, unsigned long);
991 extern void blk_queue_prep_rq(struct request_queue
*, prep_rq_fn
*pfn
);
992 extern void blk_queue_unprep_rq(struct request_queue
*, unprep_rq_fn
*ufn
);
993 extern void blk_queue_dma_alignment(struct request_queue
*, int);
994 extern void blk_queue_update_dma_alignment(struct request_queue
*, int);
995 extern void blk_queue_softirq_done(struct request_queue
*, softirq_done_fn
*);
996 extern void blk_queue_rq_timed_out(struct request_queue
*, rq_timed_out_fn
*);
997 extern void blk_queue_rq_timeout(struct request_queue
*, unsigned int);
998 extern void blk_queue_flush(struct request_queue
*q
, unsigned int flush
);
999 extern void blk_queue_flush_queueable(struct request_queue
*q
, bool queueable
);
1000 extern struct backing_dev_info
*blk_get_backing_dev_info(struct block_device
*bdev
);
1002 extern int blk_rq_map_sg(struct request_queue
*, struct request
*, struct scatterlist
*);
1003 extern void blk_dump_rq_flags(struct request
*, char *);
1004 extern long nr_blockdev_pages(void);
1006 bool __must_check
blk_get_queue(struct request_queue
*);
1007 struct request_queue
*blk_alloc_queue(gfp_t
);
1008 struct request_queue
*blk_alloc_queue_node(gfp_t
, int);
1009 extern void blk_put_queue(struct request_queue
*);
1010 extern void blk_set_queue_dying(struct request_queue
*);
1013 * block layer runtime pm functions
1016 extern void blk_pm_runtime_init(struct request_queue
*q
, struct device
*dev
);
1017 extern int blk_pre_runtime_suspend(struct request_queue
*q
);
1018 extern void blk_post_runtime_suspend(struct request_queue
*q
, int err
);
1019 extern void blk_pre_runtime_resume(struct request_queue
*q
);
1020 extern void blk_post_runtime_resume(struct request_queue
*q
, int err
);
1022 static inline void blk_pm_runtime_init(struct request_queue
*q
,
1023 struct device
*dev
) {}
1024 static inline int blk_pre_runtime_suspend(struct request_queue
*q
)
1028 static inline void blk_post_runtime_suspend(struct request_queue
*q
, int err
) {}
1029 static inline void blk_pre_runtime_resume(struct request_queue
*q
) {}
1030 static inline void blk_post_runtime_resume(struct request_queue
*q
, int err
) {}
1034 * blk_plug permits building a queue of related requests by holding the I/O
1035 * fragments for a short period. This allows merging of sequential requests
1036 * into single larger request. As the requests are moved from a per-task list to
1037 * the device's request_queue in a batch, this results in improved scalability
1038 * as the lock contention for request_queue lock is reduced.
1040 * It is ok not to disable preemption when adding the request to the plug list
1041 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1042 * the plug list when the task sleeps by itself. For details, please see
1043 * schedule() where blk_schedule_flush_plug() is called.
1046 struct list_head list
; /* requests */
1047 struct list_head mq_list
; /* blk-mq requests */
1048 struct list_head cb_list
; /* md requires an unplug callback */
1050 #define BLK_MAX_REQUEST_COUNT 16
1053 typedef void (*blk_plug_cb_fn
)(struct blk_plug_cb
*, bool);
1054 struct blk_plug_cb
{
1055 struct list_head list
;
1056 blk_plug_cb_fn callback
;
1059 extern struct blk_plug_cb
*blk_check_plugged(blk_plug_cb_fn unplug
,
1060 void *data
, int size
);
1061 extern void blk_start_plug(struct blk_plug
*);
1062 extern void blk_finish_plug(struct blk_plug
*);
1063 extern void blk_flush_plug_list(struct blk_plug
*, bool);
1065 static inline void blk_flush_plug(struct task_struct
*tsk
)
1067 struct blk_plug
*plug
= tsk
->plug
;
1070 blk_flush_plug_list(plug
, false);
1073 static inline void blk_schedule_flush_plug(struct task_struct
*tsk
)
1075 struct blk_plug
*plug
= tsk
->plug
;
1078 blk_flush_plug_list(plug
, true);
1081 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1083 struct blk_plug
*plug
= tsk
->plug
;
1086 (!list_empty(&plug
->list
) ||
1087 !list_empty(&plug
->mq_list
) ||
1088 !list_empty(&plug
->cb_list
));
1094 extern int blk_queue_start_tag(struct request_queue
*, struct request
*);
1095 extern struct request
*blk_queue_find_tag(struct request_queue
*, int);
1096 extern void blk_queue_end_tag(struct request_queue
*, struct request
*);
1097 extern int blk_queue_init_tags(struct request_queue
*, int, struct blk_queue_tag
*, int);
1098 extern void blk_queue_free_tags(struct request_queue
*);
1099 extern int blk_queue_resize_tags(struct request_queue
*, int);
1100 extern void blk_queue_invalidate_tags(struct request_queue
*);
1101 extern struct blk_queue_tag
*blk_init_tags(int, int);
1102 extern void blk_free_tags(struct blk_queue_tag
*);
1104 static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag
*bqt
,
1107 if (unlikely(bqt
== NULL
|| tag
>= bqt
->real_max_depth
))
1109 return bqt
->tag_index
[tag
];
1112 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
1114 extern int blkdev_issue_flush(struct block_device
*, gfp_t
, sector_t
*);
1115 extern int blkdev_issue_discard(struct block_device
*bdev
, sector_t sector
,
1116 sector_t nr_sects
, gfp_t gfp_mask
, unsigned long flags
);
1117 extern int blkdev_issue_write_same(struct block_device
*bdev
, sector_t sector
,
1118 sector_t nr_sects
, gfp_t gfp_mask
, struct page
*page
);
1119 extern int blkdev_issue_zeroout(struct block_device
*bdev
, sector_t sector
,
1120 sector_t nr_sects
, gfp_t gfp_mask
, bool discard
);
1121 static inline int sb_issue_discard(struct super_block
*sb
, sector_t block
,
1122 sector_t nr_blocks
, gfp_t gfp_mask
, unsigned long flags
)
1124 return blkdev_issue_discard(sb
->s_bdev
, block
<< (sb
->s_blocksize_bits
- 9),
1125 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1128 static inline int sb_issue_zeroout(struct super_block
*sb
, sector_t block
,
1129 sector_t nr_blocks
, gfp_t gfp_mask
)
1131 return blkdev_issue_zeroout(sb
->s_bdev
,
1132 block
<< (sb
->s_blocksize_bits
- 9),
1133 nr_blocks
<< (sb
->s_blocksize_bits
- 9),
1137 extern int blk_verify_command(unsigned char *cmd
, fmode_t has_write_perm
);
1139 enum blk_default_limits
{
1140 BLK_MAX_SEGMENTS
= 128,
1141 BLK_SAFE_MAX_SECTORS
= 255,
1142 BLK_DEF_MAX_SECTORS
= 2560,
1143 BLK_MAX_SEGMENT_SIZE
= 65536,
1144 BLK_SEG_BOUNDARY_MASK
= 0xFFFFFFFFUL
,
1147 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1149 static inline unsigned long queue_bounce_pfn(struct request_queue
*q
)
1151 return q
->limits
.bounce_pfn
;
1154 static inline unsigned long queue_segment_boundary(struct request_queue
*q
)
1156 return q
->limits
.seg_boundary_mask
;
1159 static inline unsigned long queue_virt_boundary(struct request_queue
*q
)
1161 return q
->limits
.virt_boundary_mask
;
1164 static inline unsigned int queue_max_sectors(struct request_queue
*q
)
1166 return q
->limits
.max_sectors
;
1169 static inline unsigned int queue_max_hw_sectors(struct request_queue
*q
)
1171 return q
->limits
.max_hw_sectors
;
1174 static inline unsigned short queue_max_segments(struct request_queue
*q
)
1176 return q
->limits
.max_segments
;
1179 static inline unsigned int queue_max_segment_size(struct request_queue
*q
)
1181 return q
->limits
.max_segment_size
;
1184 static inline unsigned short queue_logical_block_size(struct request_queue
*q
)
1188 if (q
&& q
->limits
.logical_block_size
)
1189 retval
= q
->limits
.logical_block_size
;
1194 static inline unsigned short bdev_logical_block_size(struct block_device
*bdev
)
1196 return queue_logical_block_size(bdev_get_queue(bdev
));
1199 static inline unsigned int queue_physical_block_size(struct request_queue
*q
)
1201 return q
->limits
.physical_block_size
;
1204 static inline unsigned int bdev_physical_block_size(struct block_device
*bdev
)
1206 return queue_physical_block_size(bdev_get_queue(bdev
));
1209 static inline unsigned int queue_io_min(struct request_queue
*q
)
1211 return q
->limits
.io_min
;
1214 static inline int bdev_io_min(struct block_device
*bdev
)
1216 return queue_io_min(bdev_get_queue(bdev
));
1219 static inline unsigned int queue_io_opt(struct request_queue
*q
)
1221 return q
->limits
.io_opt
;
1224 static inline int bdev_io_opt(struct block_device
*bdev
)
1226 return queue_io_opt(bdev_get_queue(bdev
));
1229 static inline int queue_alignment_offset(struct request_queue
*q
)
1231 if (q
->limits
.misaligned
)
1234 return q
->limits
.alignment_offset
;
1237 static inline int queue_limit_alignment_offset(struct queue_limits
*lim
, sector_t sector
)
1239 unsigned int granularity
= max(lim
->physical_block_size
, lim
->io_min
);
1240 unsigned int alignment
= sector_div(sector
, granularity
>> 9) << 9;
1242 return (granularity
+ lim
->alignment_offset
- alignment
) % granularity
;
1245 static inline int bdev_alignment_offset(struct block_device
*bdev
)
1247 struct request_queue
*q
= bdev_get_queue(bdev
);
1249 if (q
->limits
.misaligned
)
1252 if (bdev
!= bdev
->bd_contains
)
1253 return bdev
->bd_part
->alignment_offset
;
1255 return q
->limits
.alignment_offset
;
1258 static inline int queue_discard_alignment(struct request_queue
*q
)
1260 if (q
->limits
.discard_misaligned
)
1263 return q
->limits
.discard_alignment
;
1266 static inline int queue_limit_discard_alignment(struct queue_limits
*lim
, sector_t sector
)
1268 unsigned int alignment
, granularity
, offset
;
1270 if (!lim
->max_discard_sectors
)
1273 /* Why are these in bytes, not sectors? */
1274 alignment
= lim
->discard_alignment
>> 9;
1275 granularity
= lim
->discard_granularity
>> 9;
1279 /* Offset of the partition start in 'granularity' sectors */
1280 offset
= sector_div(sector
, granularity
);
1282 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1283 offset
= (granularity
+ alignment
- offset
) % granularity
;
1285 /* Turn it back into bytes, gaah */
1289 static inline int bdev_discard_alignment(struct block_device
*bdev
)
1291 struct request_queue
*q
= bdev_get_queue(bdev
);
1293 if (bdev
!= bdev
->bd_contains
)
1294 return bdev
->bd_part
->discard_alignment
;
1296 return q
->limits
.discard_alignment
;
1299 static inline unsigned int queue_discard_zeroes_data(struct request_queue
*q
)
1301 if (q
->limits
.max_discard_sectors
&& q
->limits
.discard_zeroes_data
== 1)
1307 static inline unsigned int bdev_discard_zeroes_data(struct block_device
*bdev
)
1309 return queue_discard_zeroes_data(bdev_get_queue(bdev
));
1312 static inline unsigned int bdev_write_same(struct block_device
*bdev
)
1314 struct request_queue
*q
= bdev_get_queue(bdev
);
1317 return q
->limits
.max_write_same_sectors
;
1322 static inline int queue_dma_alignment(struct request_queue
*q
)
1324 return q
? q
->dma_alignment
: 511;
1327 static inline int blk_rq_aligned(struct request_queue
*q
, unsigned long addr
,
1330 unsigned int alignment
= queue_dma_alignment(q
) | q
->dma_pad_mask
;
1331 return !(addr
& alignment
) && !(len
& alignment
);
1334 /* assumes size > 256 */
1335 static inline unsigned int blksize_bits(unsigned int size
)
1337 unsigned int bits
= 8;
1341 } while (size
> 256);
1345 static inline unsigned int block_size(struct block_device
*bdev
)
1347 return bdev
->bd_block_size
;
1350 static inline bool queue_flush_queueable(struct request_queue
*q
)
1352 return !q
->flush_not_queueable
;
1355 typedef struct {struct page
*v
;} Sector
;
1357 unsigned char *read_dev_sector(struct block_device
*, sector_t
, Sector
*);
1359 static inline void put_dev_sector(Sector p
)
1361 page_cache_release(p
.v
);
1365 * Check if adding a bio_vec after bprv with offset would create a gap in
1366 * the SG list. Most drivers don't care about this, but some do.
1368 static inline bool bvec_gap_to_prev(struct request_queue
*q
,
1369 struct bio_vec
*bprv
, unsigned int offset
)
1371 if (!queue_virt_boundary(q
))
1374 ((bprv
->bv_offset
+ bprv
->bv_len
) & queue_virt_boundary(q
));
1377 static inline bool bio_will_gap(struct request_queue
*q
, struct bio
*prev
,
1380 if (!bio_has_data(prev
))
1383 return bvec_gap_to_prev(q
, &prev
->bi_io_vec
[prev
->bi_vcnt
- 1],
1384 next
->bi_io_vec
[0].bv_offset
);
1387 static inline bool req_gap_back_merge(struct request
*req
, struct bio
*bio
)
1389 return bio_will_gap(req
->q
, req
->biotail
, bio
);
1392 static inline bool req_gap_front_merge(struct request
*req
, struct bio
*bio
)
1394 return bio_will_gap(req
->q
, bio
, req
->bio
);
1398 int kblockd_schedule_work(struct work_struct
*work
);
1399 int kblockd_schedule_delayed_work(struct delayed_work
*dwork
, unsigned long delay
);
1400 int kblockd_schedule_delayed_work_on(int cpu
, struct delayed_work
*dwork
, unsigned long delay
);
1402 #ifdef CONFIG_BLK_CGROUP
1404 * This should not be using sched_clock(). A real patch is in progress
1405 * to fix this up, until that is in place we need to disable preemption
1406 * around sched_clock() in this function and set_io_start_time_ns().
1408 static inline void set_start_time_ns(struct request
*req
)
1411 req
->start_time_ns
= sched_clock();
1415 static inline void set_io_start_time_ns(struct request
*req
)
1418 req
->io_start_time_ns
= sched_clock();
1422 static inline uint64_t rq_start_time_ns(struct request
*req
)
1424 return req
->start_time_ns
;
1427 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1429 return req
->io_start_time_ns
;
1432 static inline void set_start_time_ns(struct request
*req
) {}
1433 static inline void set_io_start_time_ns(struct request
*req
) {}
1434 static inline uint64_t rq_start_time_ns(struct request
*req
)
1438 static inline uint64_t rq_io_start_time_ns(struct request
*req
)
1444 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1445 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1446 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1447 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1449 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1451 enum blk_integrity_flags
{
1452 BLK_INTEGRITY_VERIFY
= 1 << 0,
1453 BLK_INTEGRITY_GENERATE
= 1 << 1,
1454 BLK_INTEGRITY_DEVICE_CAPABLE
= 1 << 2,
1455 BLK_INTEGRITY_IP_CHECKSUM
= 1 << 3,
1458 struct blk_integrity_iter
{
1462 unsigned int data_size
;
1463 unsigned short interval
;
1464 const char *disk_name
;
1467 typedef int (integrity_processing_fn
) (struct blk_integrity_iter
*);
1469 struct blk_integrity_profile
{
1470 integrity_processing_fn
*generate_fn
;
1471 integrity_processing_fn
*verify_fn
;
1475 extern void blk_integrity_register(struct gendisk
*, struct blk_integrity
*);
1476 extern void blk_integrity_unregister(struct gendisk
*);
1477 extern int blk_integrity_compare(struct gendisk
*, struct gendisk
*);
1478 extern int blk_rq_map_integrity_sg(struct request_queue
*, struct bio
*,
1479 struct scatterlist
*);
1480 extern int blk_rq_count_integrity_sg(struct request_queue
*, struct bio
*);
1481 extern bool blk_integrity_merge_rq(struct request_queue
*, struct request
*,
1483 extern bool blk_integrity_merge_bio(struct request_queue
*, struct request
*,
1486 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1488 struct blk_integrity
*bi
= &disk
->queue
->integrity
;
1497 struct blk_integrity
*bdev_get_integrity(struct block_device
*bdev
)
1499 return blk_get_integrity(bdev
->bd_disk
);
1502 static inline bool blk_integrity_rq(struct request
*rq
)
1504 return rq
->cmd_flags
& REQ_INTEGRITY
;
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 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1522 struct bio_integrity_payload
*bip
= bio_integrity(req
->bio
);
1523 struct bio_integrity_payload
*bip_next
= bio_integrity(next
);
1525 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1526 bip_next
->bip_vec
[0].bv_offset
);
1529 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1532 struct bio_integrity_payload
*bip
= bio_integrity(bio
);
1533 struct bio_integrity_payload
*bip_next
= bio_integrity(req
->bio
);
1535 return bvec_gap_to_prev(req
->q
, &bip
->bip_vec
[bip
->bip_vcnt
- 1],
1536 bip_next
->bip_vec
[0].bv_offset
);
1539 #else /* CONFIG_BLK_DEV_INTEGRITY */
1542 struct block_device
;
1544 struct blk_integrity
;
1546 static inline int blk_integrity_rq(struct request
*rq
)
1550 static inline int blk_rq_count_integrity_sg(struct request_queue
*q
,
1555 static inline int blk_rq_map_integrity_sg(struct request_queue
*q
,
1557 struct scatterlist
*s
)
1561 static inline struct blk_integrity
*bdev_get_integrity(struct block_device
*b
)
1565 static inline struct blk_integrity
*blk_get_integrity(struct gendisk
*disk
)
1569 static inline int blk_integrity_compare(struct gendisk
*a
, struct gendisk
*b
)
1573 static inline void blk_integrity_register(struct gendisk
*d
,
1574 struct blk_integrity
*b
)
1577 static inline void blk_integrity_unregister(struct gendisk
*d
)
1580 static inline void blk_queue_max_integrity_segments(struct request_queue
*q
,
1584 static inline unsigned short queue_max_integrity_segments(struct request_queue
*q
)
1588 static inline bool blk_integrity_merge_rq(struct request_queue
*rq
,
1594 static inline bool blk_integrity_merge_bio(struct request_queue
*rq
,
1601 static inline bool integrity_req_gap_back_merge(struct request
*req
,
1606 static inline bool integrity_req_gap_front_merge(struct request
*req
,
1612 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1614 struct block_device_operations
{
1615 int (*open
) (struct block_device
*, fmode_t
);
1616 void (*release
) (struct gendisk
*, fmode_t
);
1617 int (*rw_page
)(struct block_device
*, sector_t
, struct page
*, int rw
);
1618 int (*ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1619 int (*compat_ioctl
) (struct block_device
*, fmode_t
, unsigned, unsigned long);
1620 long (*direct_access
)(struct block_device
*, sector_t
, void __pmem
**,
1621 unsigned long *pfn
);
1622 unsigned int (*check_events
) (struct gendisk
*disk
,
1623 unsigned int clearing
);
1624 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1625 int (*media_changed
) (struct gendisk
*);
1626 void (*unlock_native_capacity
) (struct gendisk
*);
1627 int (*revalidate_disk
) (struct gendisk
*);
1628 int (*getgeo
)(struct block_device
*, struct hd_geometry
*);
1629 /* this callback is with swap_lock and sometimes page table lock held */
1630 void (*swap_slot_free_notify
) (struct block_device
*, unsigned long);
1631 struct module
*owner
;
1634 extern int __blkdev_driver_ioctl(struct block_device
*, fmode_t
, unsigned int,
1636 extern int bdev_read_page(struct block_device
*, sector_t
, struct page
*);
1637 extern int bdev_write_page(struct block_device
*, sector_t
, struct page
*,
1638 struct writeback_control
*);
1639 extern long bdev_direct_access(struct block_device
*, sector_t
,
1640 void __pmem
**addr
, unsigned long *pfn
, long size
);
1641 #else /* CONFIG_BLOCK */
1643 struct block_device
;
1646 * stubs for when the block layer is configured out
1648 #define buffer_heads_over_limit 0
1650 static inline long nr_blockdev_pages(void)
1658 static inline void blk_start_plug(struct blk_plug
*plug
)
1662 static inline void blk_finish_plug(struct blk_plug
*plug
)
1666 static inline void blk_flush_plug(struct task_struct
*task
)
1670 static inline void blk_schedule_flush_plug(struct task_struct
*task
)
1675 static inline bool blk_needs_flush_plug(struct task_struct
*tsk
)
1680 static inline int blkdev_issue_flush(struct block_device
*bdev
, gfp_t gfp_mask
,
1681 sector_t
*error_sector
)
1686 #endif /* CONFIG_BLOCK */