1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BLKDEV_H
3 #define _LINUX_BLKDEV_H
5 #include <linux/sched.h>
6 #include <linux/sched/clock.h>
10 #include <linux/major.h>
11 #include <linux/genhd.h>
12 #include <linux/list.h>
13 #include <linux/llist.h>
14 #include <linux/timer.h>
15 #include <linux/workqueue.h>
16 #include <linux/pagemap.h>
17 #include <linux/backing-dev-defs.h>
18 #include <linux/wait.h>
19 #include <linux/mempool.h>
20 #include <linux/pfn.h>
21 #include <linux/bio.h>
22 #include <linux/stringify.h>
23 #include <linux/gfp.h>
24 #include <linux/bsg.h>
25 #include <linux/smp.h>
26 #include <linux/rcupdate.h>
27 #include <linux/percpu-refcount.h>
28 #include <linux/scatterlist.h>
29 #include <linux/blkzoned.h>
32 struct scsi_ioctl_command;
35 struct elevator_queue;
41 struct blk_flush_queue;
44 struct blk_queue_stats;
45 struct blk_stat_callback;
47 #define BLKDEV_MIN_RQ 4
48 #define BLKDEV_MAX_RQ 128 /* Default maximum */
50 /* Must be consistent with blk_mq_poll_stats_bkt() */
51 #define BLK_MQ_POLL_STATS_BKTS 16
54 * Maximum number of blkcg policies allowed to be registered concurrently.
55 * Defined here to simplify include dependency.
57 #define BLKCG_MAX_POLS 5
59 typedef void (rq_end_io_fn)(struct request *, blk_status_t);
61 #define BLK_RL_SYNCFULL (1U << 0)
62 #define BLK_RL_ASYNCFULL (1U << 1)
65 struct request_queue *q; /* the queue this rl belongs to */
66 #ifdef CONFIG_BLK_CGROUP
67 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
70 * count[], starved[], and wait[] are indexed by
71 * BLK_RW_SYNC/BLK_RW_ASYNC
76 wait_queue_head_t wait[2];
82 typedef __u32 __bitwise req_flags_t;
84 /* elevator knows about this request */
85 #define RQF_SORTED ((__force req_flags_t)(1 << 0))
86 /* drive already may have started this one */
87 #define RQF_STARTED ((__force req_flags_t)(1 << 1))
88 /* uses tagged queueing */
89 #define RQF_QUEUED ((__force req_flags_t)(1 << 2))
90 /* may not be passed by ioscheduler */
91 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
92 /* request for flush sequence */
93 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
94 /* merge of different types, fail separately */
95 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
96 /* track inflight for MQ */
97 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
98 /* don't call prep for this one */
99 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
100 /* set for "ide_preempt" requests and also for requests for which the SCSI
101 "quiesce" state must be ignored. */
102 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
103 /* contains copies of user pages */
104 #define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
105 /* vaguely specified driver internal error. Ignored by the block layer */
106 #define RQF_FAILED ((__force req_flags_t)(1 << 10))
107 /* don't warn about errors */
108 #define RQF_QUIET ((__force req_flags_t)(1 << 11))
109 /* elevator private data attached */
110 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
111 /* account into disk and partition IO statistics */
112 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
113 /* request came from our alloc pool */
114 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
115 /* runtime pm request */
116 #define RQF_PM ((__force req_flags_t)(1 << 15))
117 /* on IO scheduler merge hash */
118 #define RQF_HASHED ((__force req_flags_t)(1 << 16))
119 /* track IO completion time */
120 #define RQF_STATS ((__force req_flags_t)(1 << 17))
121 /* Look at ->special_vec for the actual data payload instead of the
123 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
124 /* The per-zone write lock is held for this request */
125 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
126 /* already slept for hybrid poll */
127 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
128 /* ->timeout has been called, don't expire again */
129 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
131 /* flags that prevent us from merging requests: */
132 #define RQF_NOMERGE_FLAGS \
133 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
136 * Request state for blk-mq.
145 * Try to put the fields that are referenced together in the same cacheline.
147 * If you modify this structure, make sure to update blk_rq_init() and
148 * especially blk_mq_rq_ctx_init() to take care of the added fields.
151 struct request_queue *q;
152 struct blk_mq_ctx *mq_ctx;
155 unsigned int cmd_flags; /* op and common flags */
156 req_flags_t rq_flags;
160 /* the following two fields are internal, NEVER access directly */
161 unsigned int __data_len; /* total data len */
163 sector_t __sector; /* sector cursor */
168 struct list_head queuelist;
171 * The hash is used inside the scheduler, and killed once the
172 * request reaches the dispatch list. The ipi_list is only used
173 * to queue the request for softirq completion, which is long
174 * after the request has been unhashed (and even removed from
175 * the dispatch list).
178 struct hlist_node hash; /* merge hash */
179 struct list_head ipi_list;
183 * The rb_node is only used inside the io scheduler, requests
184 * are pruned when moved to the dispatch queue. So let the
185 * completion_data share space with the rb_node.
188 struct rb_node rb_node; /* sort/lookup */
189 struct bio_vec special_vec;
190 void *completion_data;
191 int error_count; /* for legacy drivers, don't use */
195 * Three pointers are available for the IO schedulers, if they need
196 * more they have to dynamically allocate it. Flush requests are
197 * never put on the IO scheduler. So let the flush fields share
198 * space with the elevator data.
208 struct list_head list;
209 rq_end_io_fn *saved_end_io;
213 struct gendisk *rq_disk;
214 struct hd_struct *part;
215 /* Time that I/O was submitted to the kernel. */
217 /* Time that I/O was submitted to the device. */
218 u64 io_start_time_ns;
220 #ifdef CONFIG_BLK_WBT
221 unsigned short wbt_flags;
223 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
224 unsigned short throtl_size;
228 * Number of scatter-gather DMA addr+len pairs after
229 * physical address coalescing is performed.
231 unsigned short nr_phys_segments;
233 #if defined(CONFIG_BLK_DEV_INTEGRITY)
234 unsigned short nr_integrity_segments;
237 unsigned short write_hint;
238 unsigned short ioprio;
240 void *special; /* opaque pointer available for LLD use */
242 unsigned int extra_len; /* length of alignment and padding */
244 enum mq_rq_state state;
247 unsigned int timeout;
249 /* access through blk_rq_set_deadline, blk_rq_deadline */
250 unsigned long __deadline;
252 struct list_head timeout_list;
255 struct __call_single_data csd;
260 * completion callback.
262 rq_end_io_fn *end_io;
266 struct request *next_rq;
268 #ifdef CONFIG_BLK_CGROUP
269 struct request_list *rl; /* rl this rq is alloced from */
273 static inline bool blk_op_is_scsi(unsigned int op)
275 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
278 static inline bool blk_op_is_private(unsigned int op)
280 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
283 static inline bool blk_rq_is_scsi(struct request *rq)
285 return blk_op_is_scsi(req_op(rq));
288 static inline bool blk_rq_is_private(struct request *rq)
290 return blk_op_is_private(req_op(rq));
293 static inline bool blk_rq_is_passthrough(struct request *rq)
295 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
298 static inline bool bio_is_passthrough(struct bio *bio)
300 unsigned op = bio_op(bio);
302 return blk_op_is_scsi(op) || blk_op_is_private(op);
305 static inline unsigned short req_get_ioprio(struct request *req)
310 #include <linux/elevator.h>
312 struct blk_queue_ctx;
314 typedef void (request_fn_proc) (struct request_queue *q);
315 typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
316 typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t);
317 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
318 typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
321 typedef void (softirq_done_fn)(struct request *);
322 typedef int (dma_drain_needed_fn)(struct request *);
323 typedef int (lld_busy_fn) (struct request_queue *q);
324 typedef int (bsg_job_fn) (struct bsg_job *);
325 typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
326 typedef void (exit_rq_fn)(struct request_queue *, struct request *);
328 enum blk_eh_timer_return {
329 BLK_EH_DONE, /* drivers has completed the command */
330 BLK_EH_RESET_TIMER, /* reset timer and try again */
333 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
335 enum blk_queue_state {
340 struct blk_queue_tag {
341 struct request **tag_index; /* map of busy tags */
342 unsigned long *tag_map; /* bit map of free/busy tags */
343 int max_depth; /* what we will send to device */
344 int real_max_depth; /* what the array can hold */
345 atomic_t refcnt; /* map can be shared */
346 int alloc_policy; /* tag allocation policy */
347 int next_tag; /* next tag */
349 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
350 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
352 #define BLK_SCSI_MAX_CMDS (256)
353 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
356 * Zoned block device models (zoned limit).
358 enum blk_zoned_model {
359 BLK_ZONED_NONE, /* Regular block device */
360 BLK_ZONED_HA, /* Host-aware zoned block device */
361 BLK_ZONED_HM, /* Host-managed zoned block device */
364 struct queue_limits {
365 unsigned long bounce_pfn;
366 unsigned long seg_boundary_mask;
367 unsigned long virt_boundary_mask;
369 unsigned int max_hw_sectors;
370 unsigned int max_dev_sectors;
371 unsigned int chunk_sectors;
372 unsigned int max_sectors;
373 unsigned int max_segment_size;
374 unsigned int physical_block_size;
375 unsigned int alignment_offset;
378 unsigned int max_discard_sectors;
379 unsigned int max_hw_discard_sectors;
380 unsigned int max_write_same_sectors;
381 unsigned int max_write_zeroes_sectors;
382 unsigned int discard_granularity;
383 unsigned int discard_alignment;
385 unsigned short logical_block_size;
386 unsigned short max_segments;
387 unsigned short max_integrity_segments;
388 unsigned short max_discard_segments;
390 unsigned char misaligned;
391 unsigned char discard_misaligned;
392 unsigned char cluster;
393 unsigned char raid_partial_stripes_expensive;
394 enum blk_zoned_model zoned;
397 #ifdef CONFIG_BLK_DEV_ZONED
399 extern unsigned int blkdev_nr_zones(struct block_device *bdev);
400 extern int blkdev_report_zones(struct block_device *bdev,
401 sector_t sector, struct blk_zone *zones,
402 unsigned int *nr_zones, gfp_t gfp_mask);
403 extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
404 sector_t nr_sectors, gfp_t gfp_mask);
405 extern int blk_revalidate_disk_zones(struct gendisk *disk);
407 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
408 unsigned int cmd, unsigned long arg);
409 extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
410 unsigned int cmd, unsigned long arg);
412 #else /* CONFIG_BLK_DEV_ZONED */
414 static inline unsigned int blkdev_nr_zones(struct block_device *bdev)
419 static inline int blk_revalidate_disk_zones(struct gendisk *disk)
424 static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
425 fmode_t mode, unsigned int cmd,
431 static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
432 fmode_t mode, unsigned int cmd,
438 #endif /* CONFIG_BLK_DEV_ZONED */
440 struct request_queue {
442 * Together with queue_head for cacheline sharing
444 struct list_head queue_head;
445 struct request *last_merge;
446 struct elevator_queue *elevator;
447 int nr_rqs[2]; /* # allocated [a]sync rqs */
448 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
450 struct blk_queue_stats *stats;
451 struct rq_qos *rq_qos;
454 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
455 * is used, root blkg allocates from @q->root_rl and all other
456 * blkgs from their own blkg->rl. Which one to use should be
457 * determined using bio_request_list().
459 struct request_list root_rl;
461 request_fn_proc *request_fn;
462 make_request_fn *make_request_fn;
464 prep_rq_fn *prep_rq_fn;
465 unprep_rq_fn *unprep_rq_fn;
466 softirq_done_fn *softirq_done_fn;
467 rq_timed_out_fn *rq_timed_out_fn;
468 dma_drain_needed_fn *dma_drain_needed;
469 lld_busy_fn *lld_busy_fn;
470 /* Called just after a request is allocated */
471 init_rq_fn *init_rq_fn;
472 /* Called just before a request is freed */
473 exit_rq_fn *exit_rq_fn;
474 /* Called from inside blk_get_request() */
475 void (*initialize_rq_fn)(struct request *rq);
477 const struct blk_mq_ops *mq_ops;
479 unsigned int *mq_map;
482 struct blk_mq_ctx __percpu *queue_ctx;
483 unsigned int nr_queues;
485 unsigned int queue_depth;
487 /* hw dispatch queues */
488 struct blk_mq_hw_ctx **queue_hw_ctx;
489 unsigned int nr_hw_queues;
492 * Dispatch queue sorting
495 struct request *boundary_rq;
498 * Delayed queue handling
500 struct delayed_work delay_work;
502 struct backing_dev_info *backing_dev_info;
505 * The queue owner gets to use this for whatever they like.
506 * ll_rw_blk doesn't touch it.
511 * various queue flags, see QUEUE_* below
513 unsigned long queue_flags;
515 * Number of contexts that have called blk_set_pm_only(). If this
516 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
522 * ida allocated id for this queue. Used to index queues from
528 * queue needs bounce pages for pages above this limit
533 * protects queue structures from reentrancy. ->__queue_lock should
534 * _never_ be used directly, it is queue private. always use
537 spinlock_t __queue_lock;
538 spinlock_t *queue_lock;
548 struct kobject mq_kobj;
550 #ifdef CONFIG_BLK_DEV_INTEGRITY
551 struct blk_integrity integrity;
552 #endif /* CONFIG_BLK_DEV_INTEGRITY */
557 unsigned int nr_pending;
563 unsigned long nr_requests; /* Max # of requests */
564 unsigned int nr_congestion_on;
565 unsigned int nr_congestion_off;
566 unsigned int nr_batching;
568 unsigned int dma_drain_size;
569 void *dma_drain_buffer;
570 unsigned int dma_pad_mask;
571 unsigned int dma_alignment;
573 struct blk_queue_tag *queue_tags;
575 unsigned int nr_sorted;
576 unsigned int in_flight[2];
579 * Number of active block driver functions for which blk_drain_queue()
580 * must wait. Must be incremented around functions that unlock the
581 * queue_lock internally, e.g. scsi_request_fn().
583 unsigned int request_fn_active;
585 unsigned int rq_timeout;
588 struct blk_stat_callback *poll_cb;
589 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
591 struct timer_list timeout;
592 struct work_struct timeout_work;
593 struct list_head timeout_list;
595 struct list_head icq_list;
596 #ifdef CONFIG_BLK_CGROUP
597 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
598 struct blkcg_gq *root_blkg;
599 struct list_head blkg_list;
602 struct queue_limits limits;
604 #ifdef CONFIG_BLK_DEV_ZONED
606 * Zoned block device information for request dispatch control.
607 * nr_zones is the total number of zones of the device. This is always
608 * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
609 * bits which indicates if a zone is conventional (bit clear) or
610 * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
611 * bits which indicates if a zone is write locked, that is, if a write
612 * request targeting the zone was dispatched. All three fields are
613 * initialized by the low level device driver (e.g. scsi/sd.c).
614 * Stacking drivers (device mappers) may or may not initialize
617 * Reads of this information must be protected with blk_queue_enter() /
618 * blk_queue_exit(). Modifying this information is only allowed while
619 * no requests are being processed. See also blk_mq_freeze_queue() and
620 * blk_mq_unfreeze_queue().
622 unsigned int nr_zones;
623 unsigned long *seq_zones_bitmap;
624 unsigned long *seq_zones_wlock;
625 #endif /* CONFIG_BLK_DEV_ZONED */
630 unsigned int sg_timeout;
631 unsigned int sg_reserved_size;
633 #ifdef CONFIG_BLK_DEV_IO_TRACE
634 struct blk_trace *blk_trace;
635 struct mutex blk_trace_mutex;
638 * for flush operations
640 struct blk_flush_queue *fq;
642 struct list_head requeue_list;
643 spinlock_t requeue_lock;
644 struct delayed_work requeue_work;
646 struct mutex sysfs_lock;
649 atomic_t mq_freeze_depth;
651 #if defined(CONFIG_BLK_DEV_BSG)
652 bsg_job_fn *bsg_job_fn;
653 struct bsg_class_device bsg_dev;
656 #ifdef CONFIG_BLK_DEV_THROTTLING
658 struct throtl_data *td;
660 struct rcu_head rcu_head;
661 wait_queue_head_t mq_freeze_wq;
662 struct percpu_ref q_usage_counter;
663 struct list_head all_q_node;
665 struct blk_mq_tag_set *tag_set;
666 struct list_head tag_set_list;
667 struct bio_set bio_split;
669 #ifdef CONFIG_BLK_DEBUG_FS
670 struct dentry *debugfs_dir;
671 struct dentry *sched_debugfs_dir;
674 bool mq_sysfs_init_done;
679 struct work_struct release_work;
681 #define BLK_MAX_WRITE_HINTS 5
682 u64 write_hints[BLK_MAX_WRITE_HINTS];
685 #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
686 #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
687 #define QUEUE_FLAG_DYING 2 /* queue being torn down */
688 #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
689 #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */
690 #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
691 #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
692 #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
693 #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
694 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
695 #define QUEUE_FLAG_IO_STAT 10 /* do disk/partitions IO accounting */
696 #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */
697 #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */
698 #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */
699 #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */
700 #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */
701 #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */
702 #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */
703 #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/
704 #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */
705 #define QUEUE_FLAG_WC 20 /* Write back caching */
706 #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */
707 #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */
708 #define QUEUE_FLAG_DAX 23 /* device supports DAX */
709 #define QUEUE_FLAG_STATS 24 /* track IO start and completion times */
710 #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */
711 #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */
712 #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
713 #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
714 #define QUEUE_FLAG_PCI_P2PDMA 29 /* device supports PCI p2p requests */
716 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
717 (1 << QUEUE_FLAG_SAME_COMP) | \
718 (1 << QUEUE_FLAG_ADD_RANDOM))
720 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
721 (1 << QUEUE_FLAG_SAME_COMP) | \
722 (1 << QUEUE_FLAG_POLL))
724 void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
725 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
726 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
727 bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q);
729 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
730 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
731 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
732 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
733 #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
734 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
735 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
736 #define blk_queue_noxmerges(q) \
737 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
738 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
739 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
740 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
741 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
742 #define blk_queue_secure_erase(q) \
743 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
744 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
745 #define blk_queue_scsi_passthrough(q) \
746 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
747 #define blk_queue_pci_p2pdma(q) \
748 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
750 #define blk_noretry_request(rq) \
751 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
752 REQ_FAILFAST_DRIVER))
753 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
754 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
755 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
757 extern void blk_set_pm_only(struct request_queue *q);
758 extern void blk_clear_pm_only(struct request_queue *q);
760 static inline int queue_in_flight(struct request_queue *q)
762 return q->in_flight[0] + q->in_flight[1];
765 static inline bool blk_account_rq(struct request *rq)
767 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
770 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
771 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
772 /* rq->queuelist of dequeued request must be list_empty() */
773 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
775 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
777 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
780 * Driver can handle struct request, if it either has an old style
781 * request_fn defined, or is blk-mq based.
783 static inline bool queue_is_rq_based(struct request_queue *q)
785 return q->request_fn || q->mq_ops;
788 static inline unsigned int blk_queue_cluster(struct request_queue *q)
790 return q->limits.cluster;
793 static inline enum blk_zoned_model
794 blk_queue_zoned_model(struct request_queue *q)
796 return q->limits.zoned;
799 static inline bool blk_queue_is_zoned(struct request_queue *q)
801 switch (blk_queue_zoned_model(q)) {
810 static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
812 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
815 #ifdef CONFIG_BLK_DEV_ZONED
816 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
818 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
821 static inline unsigned int blk_queue_zone_no(struct request_queue *q,
824 if (!blk_queue_is_zoned(q))
826 return sector >> ilog2(q->limits.chunk_sectors);
829 static inline bool blk_queue_zone_is_seq(struct request_queue *q,
832 if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap)
834 return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
836 #else /* CONFIG_BLK_DEV_ZONED */
837 static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
841 #endif /* CONFIG_BLK_DEV_ZONED */
843 static inline bool rq_is_sync(struct request *rq)
845 return op_is_sync(rq->cmd_flags);
848 static inline bool blk_rl_full(struct request_list *rl, bool sync)
850 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
852 return rl->flags & flag;
855 static inline void blk_set_rl_full(struct request_list *rl, bool sync)
857 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
862 static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
864 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
869 static inline bool rq_mergeable(struct request *rq)
871 if (blk_rq_is_passthrough(rq))
874 if (req_op(rq) == REQ_OP_FLUSH)
877 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
880 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
882 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
888 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
890 if (bio_page(a) == bio_page(b) &&
891 bio_offset(a) == bio_offset(b))
897 static inline unsigned int blk_queue_depth(struct request_queue *q)
900 return q->queue_depth;
902 return q->nr_requests;
906 * q->prep_rq_fn return values
909 BLKPREP_OK, /* serve it */
910 BLKPREP_KILL, /* fatal error, kill, return -EIO */
911 BLKPREP_DEFER, /* leave on queue */
912 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
915 extern unsigned long blk_max_low_pfn, blk_max_pfn;
918 * standard bounce addresses:
920 * BLK_BOUNCE_HIGH : bounce all highmem pages
921 * BLK_BOUNCE_ANY : don't bounce anything
922 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
925 #if BITS_PER_LONG == 32
926 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
928 #define BLK_BOUNCE_HIGH -1ULL
930 #define BLK_BOUNCE_ANY (-1ULL)
931 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
934 * default timeout for SG_IO if none specified
936 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
937 #define BLK_MIN_SG_TIMEOUT (7 * HZ)
943 unsigned long offset;
948 struct req_iterator {
949 struct bvec_iter iter;
953 /* This should not be used directly - use rq_for_each_segment */
954 #define for_each_bio(_bio) \
955 for (; _bio; _bio = _bio->bi_next)
956 #define __rq_for_each_bio(_bio, rq) \
958 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
960 #define rq_for_each_segment(bvl, _rq, _iter) \
961 __rq_for_each_bio(_iter.bio, _rq) \
962 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
964 #define rq_iter_last(bvec, _iter) \
965 (_iter.bio->bi_next == NULL && \
966 bio_iter_last(bvec, _iter.iter))
968 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
969 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
971 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
972 extern void rq_flush_dcache_pages(struct request *rq);
974 static inline void rq_flush_dcache_pages(struct request *rq)
979 extern int blk_register_queue(struct gendisk *disk);
980 extern void blk_unregister_queue(struct gendisk *disk);
981 extern blk_qc_t generic_make_request(struct bio *bio);
982 extern blk_qc_t direct_make_request(struct bio *bio);
983 extern void blk_rq_init(struct request_queue *q, struct request *rq);
984 extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
985 extern void blk_put_request(struct request *);
986 extern void __blk_put_request(struct request_queue *, struct request *);
987 extern struct request *blk_get_request(struct request_queue *, unsigned int op,
988 blk_mq_req_flags_t flags);
989 extern void blk_requeue_request(struct request_queue *, struct request *);
990 extern int blk_lld_busy(struct request_queue *q);
991 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
992 struct bio_set *bs, gfp_t gfp_mask,
993 int (*bio_ctr)(struct bio *, struct bio *, void *),
995 extern void blk_rq_unprep_clone(struct request *rq);
996 extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
998 extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
999 extern void blk_delay_queue(struct request_queue *, unsigned long);
1000 extern void blk_queue_split(struct request_queue *, struct bio **);
1001 extern void blk_recount_segments(struct request_queue *, struct bio *);
1002 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
1003 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
1004 unsigned int, void __user *);
1005 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
1006 unsigned int, void __user *);
1007 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
1008 struct scsi_ioctl_command __user *);
1010 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
1011 extern void blk_queue_exit(struct request_queue *q);
1012 extern void blk_start_queue(struct request_queue *q);
1013 extern void blk_start_queue_async(struct request_queue *q);
1014 extern void blk_stop_queue(struct request_queue *q);
1015 extern void blk_sync_queue(struct request_queue *q);
1016 extern void __blk_stop_queue(struct request_queue *q);
1017 extern void __blk_run_queue(struct request_queue *q);
1018 extern void __blk_run_queue_uncond(struct request_queue *q);
1019 extern void blk_run_queue(struct request_queue *);
1020 extern void blk_run_queue_async(struct request_queue *q);
1021 extern int blk_rq_map_user(struct request_queue *, struct request *,
1022 struct rq_map_data *, void __user *, unsigned long,
1024 extern int blk_rq_unmap_user(struct bio *);
1025 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
1026 extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
1027 struct rq_map_data *, const struct iov_iter *,
1029 extern void blk_execute_rq(struct request_queue *, struct gendisk *,
1030 struct request *, int);
1031 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
1032 struct request *, int, rq_end_io_fn *);
1034 int blk_status_to_errno(blk_status_t status);
1035 blk_status_t errno_to_blk_status(int errno);
1037 bool blk_poll(struct request_queue *q, blk_qc_t cookie);
1039 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
1041 return bdev->bd_disk->queue; /* this is never NULL */
1045 * The basic unit of block I/O is a sector. It is used in a number of contexts
1046 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
1047 * bytes. Variables of type sector_t represent an offset or size that is a
1048 * multiple of 512 bytes. Hence these two constants.
1050 #ifndef SECTOR_SHIFT
1051 #define SECTOR_SHIFT 9
1054 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
1058 * blk_rq_pos() : the current sector
1059 * blk_rq_bytes() : bytes left in the entire request
1060 * blk_rq_cur_bytes() : bytes left in the current segment
1061 * blk_rq_err_bytes() : bytes left till the next error boundary
1062 * blk_rq_sectors() : sectors left in the entire request
1063 * blk_rq_cur_sectors() : sectors left in the current segment
1065 static inline sector_t blk_rq_pos(const struct request *rq)
1067 return rq->__sector;
1070 static inline unsigned int blk_rq_bytes(const struct request *rq)
1072 return rq->__data_len;
1075 static inline int blk_rq_cur_bytes(const struct request *rq)
1077 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1080 extern unsigned int blk_rq_err_bytes(const struct request *rq);
1082 static inline unsigned int blk_rq_sectors(const struct request *rq)
1084 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
1087 static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1089 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
1092 #ifdef CONFIG_BLK_DEV_ZONED
1093 static inline unsigned int blk_rq_zone_no(struct request *rq)
1095 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1098 static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1100 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1102 #endif /* CONFIG_BLK_DEV_ZONED */
1105 * Some commands like WRITE SAME have a payload or data transfer size which
1106 * is different from the size of the request. Any driver that supports such
1107 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1108 * calculate the data transfer size.
1110 static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1112 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1113 return rq->special_vec.bv_len;
1114 return blk_rq_bytes(rq);
1117 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1120 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1121 return min(q->limits.max_discard_sectors,
1122 UINT_MAX >> SECTOR_SHIFT);
1124 if (unlikely(op == REQ_OP_WRITE_SAME))
1125 return q->limits.max_write_same_sectors;
1127 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1128 return q->limits.max_write_zeroes_sectors;
1130 return q->limits.max_sectors;
1134 * Return maximum size of a request at given offset. Only valid for
1135 * file system requests.
1137 static inline unsigned int blk_max_size_offset(struct request_queue *q,
1140 if (!q->limits.chunk_sectors)
1141 return q->limits.max_sectors;
1143 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
1144 (offset & (q->limits.chunk_sectors - 1))));
1147 static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1150 struct request_queue *q = rq->q;
1152 if (blk_rq_is_passthrough(rq))
1153 return q->limits.max_hw_sectors;
1155 if (!q->limits.chunk_sectors ||
1156 req_op(rq) == REQ_OP_DISCARD ||
1157 req_op(rq) == REQ_OP_SECURE_ERASE)
1158 return blk_queue_get_max_sectors(q, req_op(rq));
1160 return min(blk_max_size_offset(q, offset),
1161 blk_queue_get_max_sectors(q, req_op(rq)));
1164 static inline unsigned int blk_rq_count_bios(struct request *rq)
1166 unsigned int nr_bios = 0;
1169 __rq_for_each_bio(bio, rq)
1176 * Request issue related functions.
1178 extern struct request *blk_peek_request(struct request_queue *q);
1179 extern void blk_start_request(struct request *rq);
1180 extern struct request *blk_fetch_request(struct request_queue *q);
1182 void blk_steal_bios(struct bio_list *list, struct request *rq);
1185 * Request completion related functions.
1187 * blk_update_request() completes given number of bytes and updates
1188 * the request without completing it.
1190 * blk_end_request() and friends. __blk_end_request() must be called
1191 * with the request queue spinlock acquired.
1193 * Several drivers define their own end_request and call
1194 * blk_end_request() for parts of the original function.
1195 * This prevents code duplication in drivers.
1197 extern bool blk_update_request(struct request *rq, blk_status_t error,
1198 unsigned int nr_bytes);
1199 extern void blk_finish_request(struct request *rq, blk_status_t error);
1200 extern bool blk_end_request(struct request *rq, blk_status_t error,
1201 unsigned int nr_bytes);
1202 extern void blk_end_request_all(struct request *rq, blk_status_t error);
1203 extern bool __blk_end_request(struct request *rq, blk_status_t error,
1204 unsigned int nr_bytes);
1205 extern void __blk_end_request_all(struct request *rq, blk_status_t error);
1206 extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
1208 extern void blk_complete_request(struct request *);
1209 extern void __blk_complete_request(struct request *);
1210 extern void blk_abort_request(struct request *);
1211 extern void blk_unprep_request(struct request *);
1214 * Access functions for manipulating queue properties
1216 extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
1217 spinlock_t *lock, int node_id);
1218 extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
1219 extern int blk_init_allocated_queue(struct request_queue *);
1220 extern void blk_cleanup_queue(struct request_queue *);
1221 extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1222 extern void blk_queue_bounce_limit(struct request_queue *, u64);
1223 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1224 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1225 extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1226 extern void blk_queue_max_discard_segments(struct request_queue *,
1228 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1229 extern void blk_queue_max_discard_sectors(struct request_queue *q,
1230 unsigned int max_discard_sectors);
1231 extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1232 unsigned int max_write_same_sectors);
1233 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1234 unsigned int max_write_same_sectors);
1235 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1236 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1237 extern void blk_queue_alignment_offset(struct request_queue *q,
1238 unsigned int alignment);
1239 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1240 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1241 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1242 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1243 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1244 extern void blk_set_default_limits(struct queue_limits *lim);
1245 extern void blk_set_stacking_limits(struct queue_limits *lim);
1246 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1248 extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1250 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1252 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1253 extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1254 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1255 extern int blk_queue_dma_drain(struct request_queue *q,
1256 dma_drain_needed_fn *dma_drain_needed,
1257 void *buf, unsigned int size);
1258 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1259 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1260 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1261 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1262 extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1263 extern void blk_queue_dma_alignment(struct request_queue *, int);
1264 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1265 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1266 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1267 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1268 extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1269 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1272 * Number of physical segments as sent to the device.
1274 * Normally this is the number of discontiguous data segments sent by the
1275 * submitter. But for data-less command like discard we might have no
1276 * actual data segments submitted, but the driver might have to add it's
1277 * own special payload. In that case we still return 1 here so that this
1278 * special payload will be mapped.
1280 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1282 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1284 return rq->nr_phys_segments;
1288 * Number of discard segments (or ranges) the driver needs to fill in.
1289 * Each discard bio merged into a request is counted as one segment.
1291 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1293 return max_t(unsigned short, rq->nr_phys_segments, 1);
1296 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1297 extern void blk_dump_rq_flags(struct request *, char *);
1298 extern long nr_blockdev_pages(void);
1300 bool __must_check blk_get_queue(struct request_queue *);
1301 struct request_queue *blk_alloc_queue(gfp_t);
1302 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
1304 extern void blk_put_queue(struct request_queue *);
1305 extern void blk_set_queue_dying(struct request_queue *);
1308 * blk_plug permits building a queue of related requests by holding the I/O
1309 * fragments for a short period. This allows merging of sequential requests
1310 * into single larger request. As the requests are moved from a per-task list to
1311 * the device's request_queue in a batch, this results in improved scalability
1312 * as the lock contention for request_queue lock is reduced.
1314 * It is ok not to disable preemption when adding the request to the plug list
1315 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1316 * the plug list when the task sleeps by itself. For details, please see
1317 * schedule() where blk_schedule_flush_plug() is called.
1320 struct list_head list; /* requests */
1321 struct list_head mq_list; /* blk-mq requests */
1322 struct list_head cb_list; /* md requires an unplug callback */
1324 #define BLK_MAX_REQUEST_COUNT 16
1325 #define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1328 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1329 struct blk_plug_cb {
1330 struct list_head list;
1331 blk_plug_cb_fn callback;
1334 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1335 void *data, int size);
1336 extern void blk_start_plug(struct blk_plug *);
1337 extern void blk_finish_plug(struct blk_plug *);
1338 extern void blk_flush_plug_list(struct blk_plug *, bool);
1340 static inline void blk_flush_plug(struct task_struct *tsk)
1342 struct blk_plug *plug = tsk->plug;
1345 blk_flush_plug_list(plug, false);
1348 static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1350 struct blk_plug *plug = tsk->plug;
1353 blk_flush_plug_list(plug, true);
1356 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1358 struct blk_plug *plug = tsk->plug;
1361 (!list_empty(&plug->list) ||
1362 !list_empty(&plug->mq_list) ||
1363 !list_empty(&plug->cb_list));
1369 extern int blk_queue_start_tag(struct request_queue *, struct request *);
1370 extern struct request *blk_queue_find_tag(struct request_queue *, int);
1371 extern void blk_queue_end_tag(struct request_queue *, struct request *);
1372 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
1373 extern void blk_queue_free_tags(struct request_queue *);
1374 extern int blk_queue_resize_tags(struct request_queue *, int);
1375 extern struct blk_queue_tag *blk_init_tags(int, int);
1376 extern void blk_free_tags(struct blk_queue_tag *);
1378 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1381 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1383 return bqt->tag_index[tag];
1386 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1387 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1388 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1390 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1392 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1393 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1394 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1395 sector_t nr_sects, gfp_t gfp_mask, int flags,
1398 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1399 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1401 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1402 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1404 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1405 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1407 static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1408 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1410 return blkdev_issue_discard(sb->s_bdev,
1411 block << (sb->s_blocksize_bits -
1413 nr_blocks << (sb->s_blocksize_bits -
1417 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1418 sector_t nr_blocks, gfp_t gfp_mask)
1420 return blkdev_issue_zeroout(sb->s_bdev,
1421 block << (sb->s_blocksize_bits -
1423 nr_blocks << (sb->s_blocksize_bits -
1428 extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1430 enum blk_default_limits {
1431 BLK_MAX_SEGMENTS = 128,
1432 BLK_SAFE_MAX_SECTORS = 255,
1433 BLK_DEF_MAX_SECTORS = 2560,
1434 BLK_MAX_SEGMENT_SIZE = 65536,
1435 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1438 static inline unsigned long queue_segment_boundary(struct request_queue *q)
1440 return q->limits.seg_boundary_mask;
1443 static inline unsigned long queue_virt_boundary(struct request_queue *q)
1445 return q->limits.virt_boundary_mask;
1448 static inline unsigned int queue_max_sectors(struct request_queue *q)
1450 return q->limits.max_sectors;
1453 static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1455 return q->limits.max_hw_sectors;
1458 static inline unsigned short queue_max_segments(struct request_queue *q)
1460 return q->limits.max_segments;
1463 static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1465 return q->limits.max_discard_segments;
1468 static inline unsigned int queue_max_segment_size(struct request_queue *q)
1470 return q->limits.max_segment_size;
1473 static inline unsigned short queue_logical_block_size(struct request_queue *q)
1477 if (q && q->limits.logical_block_size)
1478 retval = q->limits.logical_block_size;
1483 static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1485 return queue_logical_block_size(bdev_get_queue(bdev));
1488 static inline unsigned int queue_physical_block_size(struct request_queue *q)
1490 return q->limits.physical_block_size;
1493 static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1495 return queue_physical_block_size(bdev_get_queue(bdev));
1498 static inline unsigned int queue_io_min(struct request_queue *q)
1500 return q->limits.io_min;
1503 static inline int bdev_io_min(struct block_device *bdev)
1505 return queue_io_min(bdev_get_queue(bdev));
1508 static inline unsigned int queue_io_opt(struct request_queue *q)
1510 return q->limits.io_opt;
1513 static inline int bdev_io_opt(struct block_device *bdev)
1515 return queue_io_opt(bdev_get_queue(bdev));
1518 static inline int queue_alignment_offset(struct request_queue *q)
1520 if (q->limits.misaligned)
1523 return q->limits.alignment_offset;
1526 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1528 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1529 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1532 return (granularity + lim->alignment_offset - alignment) % granularity;
1535 static inline int bdev_alignment_offset(struct block_device *bdev)
1537 struct request_queue *q = bdev_get_queue(bdev);
1539 if (q->limits.misaligned)
1542 if (bdev != bdev->bd_contains)
1543 return bdev->bd_part->alignment_offset;
1545 return q->limits.alignment_offset;
1548 static inline int queue_discard_alignment(struct request_queue *q)
1550 if (q->limits.discard_misaligned)
1553 return q->limits.discard_alignment;
1556 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1558 unsigned int alignment, granularity, offset;
1560 if (!lim->max_discard_sectors)
1563 /* Why are these in bytes, not sectors? */
1564 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1565 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1569 /* Offset of the partition start in 'granularity' sectors */
1570 offset = sector_div(sector, granularity);
1572 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1573 offset = (granularity + alignment - offset) % granularity;
1575 /* Turn it back into bytes, gaah */
1576 return offset << SECTOR_SHIFT;
1579 static inline int bdev_discard_alignment(struct block_device *bdev)
1581 struct request_queue *q = bdev_get_queue(bdev);
1583 if (bdev != bdev->bd_contains)
1584 return bdev->bd_part->discard_alignment;
1586 return q->limits.discard_alignment;
1589 static inline unsigned int bdev_write_same(struct block_device *bdev)
1591 struct request_queue *q = bdev_get_queue(bdev);
1594 return q->limits.max_write_same_sectors;
1599 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1601 struct request_queue *q = bdev_get_queue(bdev);
1604 return q->limits.max_write_zeroes_sectors;
1609 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1611 struct request_queue *q = bdev_get_queue(bdev);
1614 return blk_queue_zoned_model(q);
1616 return BLK_ZONED_NONE;
1619 static inline bool bdev_is_zoned(struct block_device *bdev)
1621 struct request_queue *q = bdev_get_queue(bdev);
1624 return blk_queue_is_zoned(q);
1629 static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
1631 struct request_queue *q = bdev_get_queue(bdev);
1634 return blk_queue_zone_sectors(q);
1638 static inline int queue_dma_alignment(struct request_queue *q)
1640 return q ? q->dma_alignment : 511;
1643 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1646 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1647 return !(addr & alignment) && !(len & alignment);
1650 /* assumes size > 256 */
1651 static inline unsigned int blksize_bits(unsigned int size)
1653 unsigned int bits = 8;
1657 } while (size > 256);
1661 static inline unsigned int block_size(struct block_device *bdev)
1663 return bdev->bd_block_size;
1666 static inline bool queue_flush_queueable(struct request_queue *q)
1668 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
1671 typedef struct {struct page *v;} Sector;
1673 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1675 static inline void put_dev_sector(Sector p)
1680 int kblockd_schedule_work(struct work_struct *work);
1681 int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1682 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1684 #define MODULE_ALIAS_BLOCKDEV(major,minor) \
1685 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1686 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1687 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1689 #if defined(CONFIG_BLK_DEV_INTEGRITY)
1691 enum blk_integrity_flags {
1692 BLK_INTEGRITY_VERIFY = 1 << 0,
1693 BLK_INTEGRITY_GENERATE = 1 << 1,
1694 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1695 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1698 struct blk_integrity_iter {
1702 unsigned int data_size;
1703 unsigned short interval;
1704 const char *disk_name;
1707 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1709 struct blk_integrity_profile {
1710 integrity_processing_fn *generate_fn;
1711 integrity_processing_fn *verify_fn;
1715 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1716 extern void blk_integrity_unregister(struct gendisk *);
1717 extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1718 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1719 struct scatterlist *);
1720 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1721 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1723 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1726 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1728 struct blk_integrity *bi = &disk->queue->integrity;
1737 struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1739 return blk_get_integrity(bdev->bd_disk);
1742 static inline bool blk_integrity_rq(struct request *rq)
1744 return rq->cmd_flags & REQ_INTEGRITY;
1747 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1750 q->limits.max_integrity_segments = segs;
1753 static inline unsigned short
1754 queue_max_integrity_segments(struct request_queue *q)
1756 return q->limits.max_integrity_segments;
1760 * bio_integrity_intervals - Return number of integrity intervals for a bio
1761 * @bi: blk_integrity profile for device
1762 * @sectors: Size of the bio in 512-byte sectors
1764 * Description: The block layer calculates everything in 512 byte
1765 * sectors but integrity metadata is done in terms of the data integrity
1766 * interval size of the storage device. Convert the block layer sectors
1767 * to the appropriate number of integrity intervals.
1769 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1770 unsigned int sectors)
1772 return sectors >> (bi->interval_exp - 9);
1775 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1776 unsigned int sectors)
1778 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1781 #else /* CONFIG_BLK_DEV_INTEGRITY */
1784 struct block_device;
1786 struct blk_integrity;
1788 static inline int blk_integrity_rq(struct request *rq)
1792 static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1797 static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1799 struct scatterlist *s)
1803 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1807 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1811 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1815 static inline void blk_integrity_register(struct gendisk *d,
1816 struct blk_integrity *b)
1819 static inline void blk_integrity_unregister(struct gendisk *d)
1822 static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1826 static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1830 static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1836 static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1843 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1844 unsigned int sectors)
1849 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1850 unsigned int sectors)
1855 #endif /* CONFIG_BLK_DEV_INTEGRITY */
1857 struct block_device_operations {
1858 int (*open) (struct block_device *, fmode_t);
1859 void (*release) (struct gendisk *, fmode_t);
1860 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1861 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1862 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1863 unsigned int (*check_events) (struct gendisk *disk,
1864 unsigned int clearing);
1865 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1866 int (*media_changed) (struct gendisk *);
1867 void (*unlock_native_capacity) (struct gendisk *);
1868 int (*revalidate_disk) (struct gendisk *);
1869 int (*getgeo)(struct block_device *, struct hd_geometry *);
1870 /* this callback is with swap_lock and sometimes page table lock held */
1871 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1872 int (*report_zones)(struct gendisk *, sector_t sector,
1873 struct blk_zone *zones, unsigned int *nr_zones,
1875 struct module *owner;
1876 const struct pr_ops *pr_ops;
1879 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1881 extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1882 extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1883 struct writeback_control *);
1885 #ifdef CONFIG_BLK_DEV_ZONED
1886 bool blk_req_needs_zone_write_lock(struct request *rq);
1887 void __blk_req_zone_write_lock(struct request *rq);
1888 void __blk_req_zone_write_unlock(struct request *rq);
1890 static inline void blk_req_zone_write_lock(struct request *rq)
1892 if (blk_req_needs_zone_write_lock(rq))
1893 __blk_req_zone_write_lock(rq);
1896 static inline void blk_req_zone_write_unlock(struct request *rq)
1898 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1899 __blk_req_zone_write_unlock(rq);
1902 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1904 return rq->q->seq_zones_wlock &&
1905 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1908 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1910 if (!blk_req_needs_zone_write_lock(rq))
1912 return !blk_req_zone_is_write_locked(rq);
1915 static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1920 static inline void blk_req_zone_write_lock(struct request *rq)
1924 static inline void blk_req_zone_write_unlock(struct request *rq)
1927 static inline bool blk_req_zone_is_write_locked(struct request *rq)
1932 static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1936 #endif /* CONFIG_BLK_DEV_ZONED */
1938 #else /* CONFIG_BLOCK */
1940 struct block_device;
1943 * stubs for when the block layer is configured out
1945 #define buffer_heads_over_limit 0
1947 static inline long nr_blockdev_pages(void)
1955 static inline void blk_start_plug(struct blk_plug *plug)
1959 static inline void blk_finish_plug(struct blk_plug *plug)
1963 static inline void blk_flush_plug(struct task_struct *task)
1967 static inline void blk_schedule_flush_plug(struct task_struct *task)
1972 static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1977 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1978 sector_t *error_sector)
1983 #endif /* CONFIG_BLOCK */