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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux-block.git] / include / linux / blkdev.h
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_BLKDEV_H
3#define _LINUX_BLKDEV_H
4
5#include <linux/sched.h>
6#include <linux/sched/clock.h>
7
8#ifdef CONFIG_BLOCK
9
10#include <linux/major.h>
11#include <linux/genhd.h>
12#include <linux/list.h>
13#include <linux/llist.h>
14#include <linux/timer.h>
15#include <linux/workqueue.h>
16#include <linux/pagemap.h>
17#include <linux/backing-dev-defs.h>
18#include <linux/wait.h>
19#include <linux/mempool.h>
20#include <linux/pfn.h>
21#include <linux/bio.h>
22#include <linux/stringify.h>
23#include <linux/gfp.h>
24#include <linux/bsg.h>
25#include <linux/smp.h>
26#include <linux/rcupdate.h>
27#include <linux/percpu-refcount.h>
28#include <linux/scatterlist.h>
29#include <linux/blkzoned.h>
30
31struct module;
32struct scsi_ioctl_command;
33
34struct request_queue;
35struct elevator_queue;
36struct blk_trace;
37struct request;
38struct sg_io_hdr;
39struct bsg_job;
40struct blkcg_gq;
41struct blk_flush_queue;
42struct pr_ops;
43struct rq_qos;
44struct blk_queue_stats;
45struct blk_stat_callback;
46
47#define BLKDEV_MIN_RQ 4
48#define BLKDEV_MAX_RQ 128 /* Default maximum */
49
50/* Must be consistent with blk_mq_poll_stats_bkt() */
51#define BLK_MQ_POLL_STATS_BKTS 16
52
53/*
54 * Maximum number of blkcg policies allowed to be registered concurrently.
55 * Defined here to simplify include dependency.
56 */
57#define BLKCG_MAX_POLS 5
58
59typedef void (rq_end_io_fn)(struct request *, blk_status_t);
60
61#define BLK_RL_SYNCFULL (1U << 0)
62#define BLK_RL_ASYNCFULL (1U << 1)
63
64struct request_list {
65 struct request_queue *q; /* the queue this rl belongs to */
66#ifdef CONFIG_BLK_CGROUP
67 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
68#endif
69 /*
70 * count[], starved[], and wait[] are indexed by
71 * BLK_RW_SYNC/BLK_RW_ASYNC
72 */
73 int count[2];
74 int starved[2];
75 mempool_t *rq_pool;
76 wait_queue_head_t wait[2];
77 unsigned int flags;
78};
79
80/*
81 * request flags */
82typedef __u32 __bitwise req_flags_t;
83
84/* elevator knows about this request */
85#define RQF_SORTED ((__force req_flags_t)(1 << 0))
86/* drive already may have started this one */
87#define RQF_STARTED ((__force req_flags_t)(1 << 1))
88/* uses tagged queueing */
89#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
90/* may not be passed by ioscheduler */
91#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
92/* request for flush sequence */
93#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
94/* merge of different types, fail separately */
95#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
96/* track inflight for MQ */
97#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
98/* don't call prep for this one */
99#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
100/* set for "ide_preempt" requests and also for requests for which the SCSI
101 "quiesce" state must be ignored. */
102#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
103/* contains copies of user pages */
104#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
105/* vaguely specified driver internal error. Ignored by the block layer */
106#define RQF_FAILED ((__force req_flags_t)(1 << 10))
107/* don't warn about errors */
108#define RQF_QUIET ((__force req_flags_t)(1 << 11))
109/* elevator private data attached */
110#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
111/* account into disk and partition IO statistics */
112#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
113/* request came from our alloc pool */
114#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
115/* runtime pm request */
116#define RQF_PM ((__force req_flags_t)(1 << 15))
117/* on IO scheduler merge hash */
118#define RQF_HASHED ((__force req_flags_t)(1 << 16))
119/* track IO completion time */
120#define RQF_STATS ((__force req_flags_t)(1 << 17))
121/* Look at ->special_vec for the actual data payload instead of the
122 bio chain. */
123#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
124/* The per-zone write lock is held for this request */
125#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
126/* already slept for hybrid poll */
127#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20))
128/* ->timeout has been called, don't expire again */
129#define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21))
130
131/* flags that prevent us from merging requests: */
132#define RQF_NOMERGE_FLAGS \
133 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
134
135/*
136 * Request state for blk-mq.
137 */
138enum mq_rq_state {
139 MQ_RQ_IDLE = 0,
140 MQ_RQ_IN_FLIGHT = 1,
141 MQ_RQ_COMPLETE = 2,
142};
143
144/*
145 * Try to put the fields that are referenced together in the same cacheline.
146 *
147 * If you modify this structure, make sure to update blk_rq_init() and
148 * especially blk_mq_rq_ctx_init() to take care of the added fields.
149 */
150struct request {
151 struct request_queue *q;
152 struct blk_mq_ctx *mq_ctx;
153
154 int cpu;
155 unsigned int cmd_flags; /* op and common flags */
156 req_flags_t rq_flags;
157
158 int internal_tag;
159
160 /* the following two fields are internal, NEVER access directly */
161 unsigned int __data_len; /* total data len */
162 int tag;
163 sector_t __sector; /* sector cursor */
164
165 struct bio *bio;
166 struct bio *biotail;
167
168 struct list_head queuelist;
169
170 /*
171 * The hash is used inside the scheduler, and killed once the
172 * request reaches the dispatch list. The ipi_list is only used
173 * to queue the request for softirq completion, which is long
174 * after the request has been unhashed (and even removed from
175 * the dispatch list).
176 */
177 union {
178 struct hlist_node hash; /* merge hash */
179 struct list_head ipi_list;
180 };
181
182 /*
183 * The rb_node is only used inside the io scheduler, requests
184 * are pruned when moved to the dispatch queue. So let the
185 * completion_data share space with the rb_node.
186 */
187 union {
188 struct rb_node rb_node; /* sort/lookup */
189 struct bio_vec special_vec;
190 void *completion_data;
191 int error_count; /* for legacy drivers, don't use */
192 };
193
194 /*
195 * Three pointers are available for the IO schedulers, if they need
196 * more they have to dynamically allocate it. Flush requests are
197 * never put on the IO scheduler. So let the flush fields share
198 * space with the elevator data.
199 */
200 union {
201 struct {
202 struct io_cq *icq;
203 void *priv[2];
204 } elv;
205
206 struct {
207 unsigned int seq;
208 struct list_head list;
209 rq_end_io_fn *saved_end_io;
210 } flush;
211 };
212
213 struct gendisk *rq_disk;
214 struct hd_struct *part;
215 /* Time that I/O was submitted to the kernel. */
216 u64 start_time_ns;
217 /* Time that I/O was submitted to the device. */
218 u64 io_start_time_ns;
219
220#ifdef CONFIG_BLK_WBT
221 unsigned short wbt_flags;
222#endif
223#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
224 unsigned short throtl_size;
225#endif
226
227 /*
228 * Number of scatter-gather DMA addr+len pairs after
229 * physical address coalescing is performed.
230 */
231 unsigned short nr_phys_segments;
232
233#if defined(CONFIG_BLK_DEV_INTEGRITY)
234 unsigned short nr_integrity_segments;
235#endif
236
237 unsigned short write_hint;
238 unsigned short ioprio;
239
240 void *special; /* opaque pointer available for LLD use */
241
242 unsigned int extra_len; /* length of alignment and padding */
243
244 enum mq_rq_state state;
245 refcount_t ref;
246
247 unsigned int timeout;
248
249 /* access through blk_rq_set_deadline, blk_rq_deadline */
250 unsigned long __deadline;
251
252 struct list_head timeout_list;
253
254 union {
255 struct __call_single_data csd;
256 u64 fifo_time;
257 };
258
259 /*
260 * completion callback.
261 */
262 rq_end_io_fn *end_io;
263 void *end_io_data;
264
265 /* for bidi */
266 struct request *next_rq;
267
268#ifdef CONFIG_BLK_CGROUP
269 struct request_list *rl; /* rl this rq is alloced from */
270#endif
271};
272
273static inline bool blk_op_is_scsi(unsigned int op)
274{
275 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
276}
277
278static inline bool blk_op_is_private(unsigned int op)
279{
280 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
281}
282
283static inline bool blk_rq_is_scsi(struct request *rq)
284{
285 return blk_op_is_scsi(req_op(rq));
286}
287
288static inline bool blk_rq_is_private(struct request *rq)
289{
290 return blk_op_is_private(req_op(rq));
291}
292
293static inline bool blk_rq_is_passthrough(struct request *rq)
294{
295 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
296}
297
298static inline bool bio_is_passthrough(struct bio *bio)
299{
300 unsigned op = bio_op(bio);
301
302 return blk_op_is_scsi(op) || blk_op_is_private(op);
303}
304
305static inline unsigned short req_get_ioprio(struct request *req)
306{
307 return req->ioprio;
308}
309
310#include <linux/elevator.h>
311
312struct blk_queue_ctx;
313
314typedef void (request_fn_proc) (struct request_queue *q);
315typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
316typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t);
317typedef int (prep_rq_fn) (struct request_queue *, struct request *);
318typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
319
320struct bio_vec;
321typedef void (softirq_done_fn)(struct request *);
322typedef int (dma_drain_needed_fn)(struct request *);
323typedef int (lld_busy_fn) (struct request_queue *q);
324typedef int (bsg_job_fn) (struct bsg_job *);
325typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
326typedef void (exit_rq_fn)(struct request_queue *, struct request *);
327
328enum blk_eh_timer_return {
329 BLK_EH_DONE, /* drivers has completed the command */
330 BLK_EH_RESET_TIMER, /* reset timer and try again */
331};
332
333typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
334
335enum blk_queue_state {
336 Queue_down,
337 Queue_up,
338};
339
340struct blk_queue_tag {
341 struct request **tag_index; /* map of busy tags */
342 unsigned long *tag_map; /* bit map of free/busy tags */
343 int max_depth; /* what we will send to device */
344 int real_max_depth; /* what the array can hold */
345 atomic_t refcnt; /* map can be shared */
346 int alloc_policy; /* tag allocation policy */
347 int next_tag; /* next tag */
348};
349#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
350#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
351
352#define BLK_SCSI_MAX_CMDS (256)
353#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
354
355/*
356 * Zoned block device models (zoned limit).
357 */
358enum blk_zoned_model {
359 BLK_ZONED_NONE, /* Regular block device */
360 BLK_ZONED_HA, /* Host-aware zoned block device */
361 BLK_ZONED_HM, /* Host-managed zoned block device */
362};
363
364struct queue_limits {
365 unsigned long bounce_pfn;
366 unsigned long seg_boundary_mask;
367 unsigned long virt_boundary_mask;
368
369 unsigned int max_hw_sectors;
370 unsigned int max_dev_sectors;
371 unsigned int chunk_sectors;
372 unsigned int max_sectors;
373 unsigned int max_segment_size;
374 unsigned int physical_block_size;
375 unsigned int alignment_offset;
376 unsigned int io_min;
377 unsigned int io_opt;
378 unsigned int max_discard_sectors;
379 unsigned int max_hw_discard_sectors;
380 unsigned int max_write_same_sectors;
381 unsigned int max_write_zeroes_sectors;
382 unsigned int discard_granularity;
383 unsigned int discard_alignment;
384
385 unsigned short logical_block_size;
386 unsigned short max_segments;
387 unsigned short max_integrity_segments;
388 unsigned short max_discard_segments;
389
390 unsigned char misaligned;
391 unsigned char discard_misaligned;
392 unsigned char cluster;
393 unsigned char raid_partial_stripes_expensive;
394 enum blk_zoned_model zoned;
395};
396
397#ifdef CONFIG_BLK_DEV_ZONED
398
399extern unsigned int blkdev_nr_zones(struct block_device *bdev);
400extern 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);
403extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
404 sector_t nr_sectors, gfp_t gfp_mask);
405extern int blk_revalidate_disk_zones(struct gendisk *disk);
406
407extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
408 unsigned int cmd, unsigned long arg);
409extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
410 unsigned int cmd, unsigned long arg);
411
412#else /* CONFIG_BLK_DEV_ZONED */
413
414static inline unsigned int blkdev_nr_zones(struct block_device *bdev)
415{
416 return 0;
417}
418
419static inline int blk_revalidate_disk_zones(struct gendisk *disk)
420{
421 return 0;
422}
423
424static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
425 fmode_t mode, unsigned int cmd,
426 unsigned long arg)
427{
428 return -ENOTTY;
429}
430
431static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
432 fmode_t mode, unsigned int cmd,
433 unsigned long arg)
434{
435 return -ENOTTY;
436}
437
438#endif /* CONFIG_BLK_DEV_ZONED */
439
440struct request_queue {
441 /*
442 * Together with queue_head for cacheline sharing
443 */
444 struct list_head queue_head;
445 struct request *last_merge;
446 struct elevator_queue *elevator;
447 int nr_rqs[2]; /* # allocated [a]sync rqs */
448 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
449
450 struct blk_queue_stats *stats;
451 struct rq_qos *rq_qos;
452
453 /*
454 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
455 * is used, root blkg allocates from @q->root_rl and all other
456 * blkgs from their own blkg->rl. Which one to use should be
457 * determined using bio_request_list().
458 */
459 struct request_list root_rl;
460
461 request_fn_proc *request_fn;
462 make_request_fn *make_request_fn;
463 poll_q_fn *poll_fn;
464 prep_rq_fn *prep_rq_fn;
465 unprep_rq_fn *unprep_rq_fn;
466 softirq_done_fn *softirq_done_fn;
467 rq_timed_out_fn *rq_timed_out_fn;
468 dma_drain_needed_fn *dma_drain_needed;
469 lld_busy_fn *lld_busy_fn;
470 /* Called just after a request is allocated */
471 init_rq_fn *init_rq_fn;
472 /* Called just before a request is freed */
473 exit_rq_fn *exit_rq_fn;
474 /* Called from inside blk_get_request() */
475 void (*initialize_rq_fn)(struct request *rq);
476
477 const struct blk_mq_ops *mq_ops;
478
479 unsigned int *mq_map;
480
481 /* sw queues */
482 struct blk_mq_ctx __percpu *queue_ctx;
483 unsigned int nr_queues;
484
485 unsigned int queue_depth;
486
487 /* hw dispatch queues */
488 struct blk_mq_hw_ctx **queue_hw_ctx;
489 unsigned int nr_hw_queues;
490
491 /*
492 * Dispatch queue sorting
493 */
494 sector_t end_sector;
495 struct request *boundary_rq;
496
497 /*
498 * Delayed queue handling
499 */
500 struct delayed_work delay_work;
501
502 struct backing_dev_info *backing_dev_info;
503
504 /*
505 * The queue owner gets to use this for whatever they like.
506 * ll_rw_blk doesn't touch it.
507 */
508 void *queuedata;
509
510 /*
511 * various queue flags, see QUEUE_* below
512 */
513 unsigned long queue_flags;
514 /*
515 * Number of contexts that have called blk_set_pm_only(). If this
516 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
517 * processed.
518 */
519 atomic_t pm_only;
520
521 /*
522 * ida allocated id for this queue. Used to index queues from
523 * ioctx.
524 */
525 int id;
526
527 /*
528 * queue needs bounce pages for pages above this limit
529 */
530 gfp_t bounce_gfp;
531
532 /*
533 * protects queue structures from reentrancy. ->__queue_lock should
534 * _never_ be used directly, it is queue private. always use
535 * ->queue_lock.
536 */
537 spinlock_t __queue_lock;
538 spinlock_t *queue_lock;
539
540 /*
541 * queue kobject
542 */
543 struct kobject kobj;
544
545 /*
546 * mq queue kobject
547 */
548 struct kobject mq_kobj;
549
550#ifdef CONFIG_BLK_DEV_INTEGRITY
551 struct blk_integrity integrity;
552#endif /* CONFIG_BLK_DEV_INTEGRITY */
553
554#ifdef CONFIG_PM
555 struct device *dev;
556 int rpm_status;
557 unsigned int nr_pending;
558#endif
559
560 /*
561 * queue settings
562 */
563 unsigned long nr_requests; /* Max # of requests */
564 unsigned int nr_congestion_on;
565 unsigned int nr_congestion_off;
566 unsigned int nr_batching;
567
568 unsigned int dma_drain_size;
569 void *dma_drain_buffer;
570 unsigned int dma_pad_mask;
571 unsigned int dma_alignment;
572
573 struct blk_queue_tag *queue_tags;
574
575 unsigned int nr_sorted;
576 unsigned int in_flight[2];
577
578 /*
579 * Number of active block driver functions for which blk_drain_queue()
580 * must wait. Must be incremented around functions that unlock the
581 * queue_lock internally, e.g. scsi_request_fn().
582 */
583 unsigned int request_fn_active;
584
585 unsigned int rq_timeout;
586 int poll_nsec;
587
588 struct blk_stat_callback *poll_cb;
589 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS];
590
591 struct timer_list timeout;
592 struct work_struct timeout_work;
593 struct list_head timeout_list;
594
595 struct list_head icq_list;
596#ifdef CONFIG_BLK_CGROUP
597 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
598 struct blkcg_gq *root_blkg;
599 struct list_head blkg_list;
600#endif
601
602 struct queue_limits limits;
603
604#ifdef CONFIG_BLK_DEV_ZONED
605 /*
606 * Zoned block device information for request dispatch control.
607 * nr_zones is the total number of zones of the device. This is always
608 * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones
609 * bits which indicates if a zone is conventional (bit clear) or
610 * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones
611 * bits which indicates if a zone is write locked, that is, if a write
612 * request targeting the zone was dispatched. All three fields are
613 * initialized by the low level device driver (e.g. scsi/sd.c).
614 * Stacking drivers (device mappers) may or may not initialize
615 * these fields.
616 *
617 * Reads of this information must be protected with blk_queue_enter() /
618 * blk_queue_exit(). Modifying this information is only allowed while
619 * no requests are being processed. See also blk_mq_freeze_queue() and
620 * blk_mq_unfreeze_queue().
621 */
622 unsigned int nr_zones;
623 unsigned long *seq_zones_bitmap;
624 unsigned long *seq_zones_wlock;
625#endif /* CONFIG_BLK_DEV_ZONED */
626
627 /*
628 * sg stuff
629 */
630 unsigned int sg_timeout;
631 unsigned int sg_reserved_size;
632 int node;
633#ifdef CONFIG_BLK_DEV_IO_TRACE
634 struct blk_trace *blk_trace;
635 struct mutex blk_trace_mutex;
636#endif
637 /*
638 * for flush operations
639 */
640 struct blk_flush_queue *fq;
641
642 struct list_head requeue_list;
643 spinlock_t requeue_lock;
644 struct delayed_work requeue_work;
645
646 struct mutex sysfs_lock;
647
648 int bypass_depth;
649 atomic_t mq_freeze_depth;
650
651#if defined(CONFIG_BLK_DEV_BSG)
652 bsg_job_fn *bsg_job_fn;
653 struct bsg_class_device bsg_dev;
654#endif
655
656#ifdef CONFIG_BLK_DEV_THROTTLING
657 /* Throttle data */
658 struct throtl_data *td;
659#endif
660 struct rcu_head rcu_head;
661 wait_queue_head_t mq_freeze_wq;
662 struct percpu_ref q_usage_counter;
663 struct list_head all_q_node;
664
665 struct blk_mq_tag_set *tag_set;
666 struct list_head tag_set_list;
667 struct bio_set bio_split;
668
669#ifdef CONFIG_BLK_DEBUG_FS
670 struct dentry *debugfs_dir;
671 struct dentry *sched_debugfs_dir;
672#endif
673
674 bool mq_sysfs_init_done;
675
676 size_t cmd_size;
677 void *rq_alloc_data;
678
679 struct work_struct release_work;
680
681#define BLK_MAX_WRITE_HINTS 5
682 u64 write_hints[BLK_MAX_WRITE_HINTS];
683};
684
685#define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */
686#define QUEUE_FLAG_STOPPED 1 /* queue is stopped */
687#define QUEUE_FLAG_DYING 2 /* queue being torn down */
688#define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */
689#define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */
690#define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */
691#define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */
692#define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */
693#define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */
694#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
695#define QUEUE_FLAG_IO_STAT 10 /* do disk/partitions IO accounting */
696#define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */
697#define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */
698#define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */
699#define QUEUE_FLAG_SECERASE 14 /* supports secure erase */
700#define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */
701#define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */
702#define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */
703#define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/
704#define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */
705#define QUEUE_FLAG_WC 20 /* Write back caching */
706#define QUEUE_FLAG_FUA 21 /* device supports FUA writes */
707#define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */
708#define QUEUE_FLAG_DAX 23 /* device supports DAX */
709#define QUEUE_FLAG_STATS 24 /* track IO start and completion times */
710#define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */
711#define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */
712#define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */
713#define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */
714#define QUEUE_FLAG_PCI_P2PDMA 29 /* device supports PCI p2p requests */
715
716#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
717 (1 << QUEUE_FLAG_SAME_COMP) | \
718 (1 << QUEUE_FLAG_ADD_RANDOM))
719
720#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
721 (1 << QUEUE_FLAG_SAME_COMP) | \
722 (1 << QUEUE_FLAG_POLL))
723
724void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
725void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
726bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
727bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q);
728
729#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
730#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
731#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
732#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
733#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
734#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
735#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
736#define blk_queue_noxmerges(q) \
737 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
738#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
739#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
740#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
741#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
742#define blk_queue_secure_erase(q) \
743 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
744#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
745#define blk_queue_scsi_passthrough(q) \
746 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
747#define blk_queue_pci_p2pdma(q) \
748 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
749
750#define blk_noretry_request(rq) \
751 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
752 REQ_FAILFAST_DRIVER))
753#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
754#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
755#define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
756
757extern void blk_set_pm_only(struct request_queue *q);
758extern void blk_clear_pm_only(struct request_queue *q);
759
760static inline int queue_in_flight(struct request_queue *q)
761{
762 return q->in_flight[0] + q->in_flight[1];
763}
764
765static inline bool blk_account_rq(struct request *rq)
766{
767 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
768}
769
770#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
771#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
772/* rq->queuelist of dequeued request must be list_empty() */
773#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
774
775#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
776
777#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
778
779/*
780 * Driver can handle struct request, if it either has an old style
781 * request_fn defined, or is blk-mq based.
782 */
783static inline bool queue_is_rq_based(struct request_queue *q)
784{
785 return q->request_fn || q->mq_ops;
786}
787
788static inline unsigned int blk_queue_cluster(struct request_queue *q)
789{
790 return q->limits.cluster;
791}
792
793static inline enum blk_zoned_model
794blk_queue_zoned_model(struct request_queue *q)
795{
796 return q->limits.zoned;
797}
798
799static inline bool blk_queue_is_zoned(struct request_queue *q)
800{
801 switch (blk_queue_zoned_model(q)) {
802 case BLK_ZONED_HA:
803 case BLK_ZONED_HM:
804 return true;
805 default:
806 return false;
807 }
808}
809
810static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
811{
812 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
813}
814
815#ifdef CONFIG_BLK_DEV_ZONED
816static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
817{
818 return blk_queue_is_zoned(q) ? q->nr_zones : 0;
819}
820
821static inline unsigned int blk_queue_zone_no(struct request_queue *q,
822 sector_t sector)
823{
824 if (!blk_queue_is_zoned(q))
825 return 0;
826 return sector >> ilog2(q->limits.chunk_sectors);
827}
828
829static inline bool blk_queue_zone_is_seq(struct request_queue *q,
830 sector_t sector)
831{
832 if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap)
833 return false;
834 return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
835}
836#else /* CONFIG_BLK_DEV_ZONED */
837static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
838{
839 return 0;
840}
841#endif /* CONFIG_BLK_DEV_ZONED */
842
843static inline bool rq_is_sync(struct request *rq)
844{
845 return op_is_sync(rq->cmd_flags);
846}
847
848static inline bool blk_rl_full(struct request_list *rl, bool sync)
849{
850 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
851
852 return rl->flags & flag;
853}
854
855static inline void blk_set_rl_full(struct request_list *rl, bool sync)
856{
857 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
858
859 rl->flags |= flag;
860}
861
862static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
863{
864 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
865
866 rl->flags &= ~flag;
867}
868
869static inline bool rq_mergeable(struct request *rq)
870{
871 if (blk_rq_is_passthrough(rq))
872 return false;
873
874 if (req_op(rq) == REQ_OP_FLUSH)
875 return false;
876
877 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
878 return false;
879
880 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
881 return false;
882 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
883 return false;
884
885 return true;
886}
887
888static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
889{
890 if (bio_page(a) == bio_page(b) &&
891 bio_offset(a) == bio_offset(b))
892 return true;
893
894 return false;
895}
896
897static inline unsigned int blk_queue_depth(struct request_queue *q)
898{
899 if (q->queue_depth)
900 return q->queue_depth;
901
902 return q->nr_requests;
903}
904
905/*
906 * q->prep_rq_fn return values
907 */
908enum {
909 BLKPREP_OK, /* serve it */
910 BLKPREP_KILL, /* fatal error, kill, return -EIO */
911 BLKPREP_DEFER, /* leave on queue */
912 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
913};
914
915extern unsigned long blk_max_low_pfn, blk_max_pfn;
916
917/*
918 * standard bounce addresses:
919 *
920 * BLK_BOUNCE_HIGH : bounce all highmem pages
921 * BLK_BOUNCE_ANY : don't bounce anything
922 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
923 */
924
925#if BITS_PER_LONG == 32
926#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
927#else
928#define BLK_BOUNCE_HIGH -1ULL
929#endif
930#define BLK_BOUNCE_ANY (-1ULL)
931#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
932
933/*
934 * default timeout for SG_IO if none specified
935 */
936#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
937#define BLK_MIN_SG_TIMEOUT (7 * HZ)
938
939struct rq_map_data {
940 struct page **pages;
941 int page_order;
942 int nr_entries;
943 unsigned long offset;
944 int null_mapped;
945 int from_user;
946};
947
948struct req_iterator {
949 struct bvec_iter iter;
950 struct bio *bio;
951};
952
953/* This should not be used directly - use rq_for_each_segment */
954#define for_each_bio(_bio) \
955 for (; _bio; _bio = _bio->bi_next)
956#define __rq_for_each_bio(_bio, rq) \
957 if ((rq->bio)) \
958 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
959
960#define rq_for_each_segment(bvl, _rq, _iter) \
961 __rq_for_each_bio(_iter.bio, _rq) \
962 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
963
964#define rq_iter_last(bvec, _iter) \
965 (_iter.bio->bi_next == NULL && \
966 bio_iter_last(bvec, _iter.iter))
967
968#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
969# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
970#endif
971#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
972extern void rq_flush_dcache_pages(struct request *rq);
973#else
974static inline void rq_flush_dcache_pages(struct request *rq)
975{
976}
977#endif
978
979extern int blk_register_queue(struct gendisk *disk);
980extern void blk_unregister_queue(struct gendisk *disk);
981extern blk_qc_t generic_make_request(struct bio *bio);
982extern blk_qc_t direct_make_request(struct bio *bio);
983extern void blk_rq_init(struct request_queue *q, struct request *rq);
984extern void blk_init_request_from_bio(struct request *req, struct bio *bio);
985extern void blk_put_request(struct request *);
986extern void __blk_put_request(struct request_queue *, struct request *);
987extern struct request *blk_get_request(struct request_queue *, unsigned int op,
988 blk_mq_req_flags_t flags);
989extern void blk_requeue_request(struct request_queue *, struct request *);
990extern int blk_lld_busy(struct request_queue *q);
991extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
992 struct bio_set *bs, gfp_t gfp_mask,
993 int (*bio_ctr)(struct bio *, struct bio *, void *),
994 void *data);
995extern void blk_rq_unprep_clone(struct request *rq);
996extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
997 struct request *rq);
998extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
999extern void blk_delay_queue(struct request_queue *, unsigned long);
1000extern void blk_queue_split(struct request_queue *, struct bio **);
1001extern void blk_recount_segments(struct request_queue *, struct bio *);
1002extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
1003extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
1004 unsigned int, void __user *);
1005extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
1006 unsigned int, void __user *);
1007extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
1008 struct scsi_ioctl_command __user *);
1009
1010extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
1011extern void blk_queue_exit(struct request_queue *q);
1012extern void blk_start_queue(struct request_queue *q);
1013extern void blk_start_queue_async(struct request_queue *q);
1014extern void blk_stop_queue(struct request_queue *q);
1015extern void blk_sync_queue(struct request_queue *q);
1016extern void __blk_stop_queue(struct request_queue *q);
1017extern void __blk_run_queue(struct request_queue *q);
1018extern void __blk_run_queue_uncond(struct request_queue *q);
1019extern void blk_run_queue(struct request_queue *);
1020extern void blk_run_queue_async(struct request_queue *q);
1021extern int blk_rq_map_user(struct request_queue *, struct request *,
1022 struct rq_map_data *, void __user *, unsigned long,
1023 gfp_t);
1024extern int blk_rq_unmap_user(struct bio *);
1025extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
1026extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
1027 struct rq_map_data *, const struct iov_iter *,
1028 gfp_t);
1029extern void blk_execute_rq(struct request_queue *, struct gendisk *,
1030 struct request *, int);
1031extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
1032 struct request *, int, rq_end_io_fn *);
1033
1034int blk_status_to_errno(blk_status_t status);
1035blk_status_t errno_to_blk_status(int errno);
1036
1037bool blk_poll(struct request_queue *q, blk_qc_t cookie);
1038
1039static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
1040{
1041 return bdev->bd_disk->queue; /* this is never NULL */
1042}
1043
1044/*
1045 * The basic unit of block I/O is a sector. It is used in a number of contexts
1046 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
1047 * bytes. Variables of type sector_t represent an offset or size that is a
1048 * multiple of 512 bytes. Hence these two constants.
1049 */
1050#ifndef SECTOR_SHIFT
1051#define SECTOR_SHIFT 9
1052#endif
1053#ifndef SECTOR_SIZE
1054#define SECTOR_SIZE (1 << SECTOR_SHIFT)
1055#endif
1056
1057/*
1058 * blk_rq_pos() : the current sector
1059 * blk_rq_bytes() : bytes left in the entire request
1060 * blk_rq_cur_bytes() : bytes left in the current segment
1061 * blk_rq_err_bytes() : bytes left till the next error boundary
1062 * blk_rq_sectors() : sectors left in the entire request
1063 * blk_rq_cur_sectors() : sectors left in the current segment
1064 */
1065static inline sector_t blk_rq_pos(const struct request *rq)
1066{
1067 return rq->__sector;
1068}
1069
1070static inline unsigned int blk_rq_bytes(const struct request *rq)
1071{
1072 return rq->__data_len;
1073}
1074
1075static inline int blk_rq_cur_bytes(const struct request *rq)
1076{
1077 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1078}
1079
1080extern unsigned int blk_rq_err_bytes(const struct request *rq);
1081
1082static inline unsigned int blk_rq_sectors(const struct request *rq)
1083{
1084 return blk_rq_bytes(rq) >> SECTOR_SHIFT;
1085}
1086
1087static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1088{
1089 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
1090}
1091
1092#ifdef CONFIG_BLK_DEV_ZONED
1093static inline unsigned int blk_rq_zone_no(struct request *rq)
1094{
1095 return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
1096}
1097
1098static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
1099{
1100 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
1101}
1102#endif /* CONFIG_BLK_DEV_ZONED */
1103
1104/*
1105 * Some commands like WRITE SAME have a payload or data transfer size which
1106 * is different from the size of the request. Any driver that supports such
1107 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1108 * calculate the data transfer size.
1109 */
1110static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1111{
1112 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1113 return rq->special_vec.bv_len;
1114 return blk_rq_bytes(rq);
1115}
1116
1117static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
1118 int op)
1119{
1120 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
1121 return min(q->limits.max_discard_sectors,
1122 UINT_MAX >> SECTOR_SHIFT);
1123
1124 if (unlikely(op == REQ_OP_WRITE_SAME))
1125 return q->limits.max_write_same_sectors;
1126
1127 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1128 return q->limits.max_write_zeroes_sectors;
1129
1130 return q->limits.max_sectors;
1131}
1132
1133/*
1134 * Return maximum size of a request at given offset. Only valid for
1135 * file system requests.
1136 */
1137static inline unsigned int blk_max_size_offset(struct request_queue *q,
1138 sector_t offset)
1139{
1140 if (!q->limits.chunk_sectors)
1141 return q->limits.max_sectors;
1142
1143 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
1144 (offset & (q->limits.chunk_sectors - 1))));
1145}
1146
1147static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1148 sector_t offset)
1149{
1150 struct request_queue *q = rq->q;
1151
1152 if (blk_rq_is_passthrough(rq))
1153 return q->limits.max_hw_sectors;
1154
1155 if (!q->limits.chunk_sectors ||
1156 req_op(rq) == REQ_OP_DISCARD ||
1157 req_op(rq) == REQ_OP_SECURE_ERASE)
1158 return blk_queue_get_max_sectors(q, req_op(rq));
1159
1160 return min(blk_max_size_offset(q, offset),
1161 blk_queue_get_max_sectors(q, req_op(rq)));
1162}
1163
1164static inline unsigned int blk_rq_count_bios(struct request *rq)
1165{
1166 unsigned int nr_bios = 0;
1167 struct bio *bio;
1168
1169 __rq_for_each_bio(bio, rq)
1170 nr_bios++;
1171
1172 return nr_bios;
1173}
1174
1175/*
1176 * Request issue related functions.
1177 */
1178extern struct request *blk_peek_request(struct request_queue *q);
1179extern void blk_start_request(struct request *rq);
1180extern struct request *blk_fetch_request(struct request_queue *q);
1181
1182void blk_steal_bios(struct bio_list *list, struct request *rq);
1183
1184/*
1185 * Request completion related functions.
1186 *
1187 * blk_update_request() completes given number of bytes and updates
1188 * the request without completing it.
1189 *
1190 * blk_end_request() and friends. __blk_end_request() must be called
1191 * with the request queue spinlock acquired.
1192 *
1193 * Several drivers define their own end_request and call
1194 * blk_end_request() for parts of the original function.
1195 * This prevents code duplication in drivers.
1196 */
1197extern bool blk_update_request(struct request *rq, blk_status_t error,
1198 unsigned int nr_bytes);
1199extern void blk_finish_request(struct request *rq, blk_status_t error);
1200extern bool blk_end_request(struct request *rq, blk_status_t error,
1201 unsigned int nr_bytes);
1202extern void blk_end_request_all(struct request *rq, blk_status_t error);
1203extern bool __blk_end_request(struct request *rq, blk_status_t error,
1204 unsigned int nr_bytes);
1205extern void __blk_end_request_all(struct request *rq, blk_status_t error);
1206extern bool __blk_end_request_cur(struct request *rq, blk_status_t error);
1207
1208extern void blk_complete_request(struct request *);
1209extern void __blk_complete_request(struct request *);
1210extern void blk_abort_request(struct request *);
1211extern void blk_unprep_request(struct request *);
1212
1213/*
1214 * Access functions for manipulating queue properties
1215 */
1216extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
1217 spinlock_t *lock, int node_id);
1218extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
1219extern int blk_init_allocated_queue(struct request_queue *);
1220extern void blk_cleanup_queue(struct request_queue *);
1221extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1222extern void blk_queue_bounce_limit(struct request_queue *, u64);
1223extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1224extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1225extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1226extern void blk_queue_max_discard_segments(struct request_queue *,
1227 unsigned short);
1228extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1229extern void blk_queue_max_discard_sectors(struct request_queue *q,
1230 unsigned int max_discard_sectors);
1231extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1232 unsigned int max_write_same_sectors);
1233extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1234 unsigned int max_write_same_sectors);
1235extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1236extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1237extern void blk_queue_alignment_offset(struct request_queue *q,
1238 unsigned int alignment);
1239extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1240extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1241extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1242extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1243extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1244extern void blk_set_default_limits(struct queue_limits *lim);
1245extern void blk_set_stacking_limits(struct queue_limits *lim);
1246extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1247 sector_t offset);
1248extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1249 sector_t offset);
1250extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1251 sector_t offset);
1252extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1253extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
1254extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1255extern int blk_queue_dma_drain(struct request_queue *q,
1256 dma_drain_needed_fn *dma_drain_needed,
1257 void *buf, unsigned int size);
1258extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
1259extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1260extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1261extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
1262extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
1263extern void blk_queue_dma_alignment(struct request_queue *, int);
1264extern void blk_queue_update_dma_alignment(struct request_queue *, int);
1265extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
1266extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1267extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1268extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
1269extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1270
1271/*
1272 * Number of physical segments as sent to the device.
1273 *
1274 * Normally this is the number of discontiguous data segments sent by the
1275 * submitter. But for data-less command like discard we might have no
1276 * actual data segments submitted, but the driver might have to add it's
1277 * own special payload. In that case we still return 1 here so that this
1278 * special payload will be mapped.
1279 */
1280static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1281{
1282 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1283 return 1;
1284 return rq->nr_phys_segments;
1285}
1286
1287/*
1288 * Number of discard segments (or ranges) the driver needs to fill in.
1289 * Each discard bio merged into a request is counted as one segment.
1290 */
1291static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1292{
1293 return max_t(unsigned short, rq->nr_phys_segments, 1);
1294}
1295
1296extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1297extern void blk_dump_rq_flags(struct request *, char *);
1298extern long nr_blockdev_pages(void);
1299
1300bool __must_check blk_get_queue(struct request_queue *);
1301struct request_queue *blk_alloc_queue(gfp_t);
1302struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
1303 spinlock_t *lock);
1304extern void blk_put_queue(struct request_queue *);
1305extern void blk_set_queue_dying(struct request_queue *);
1306
1307/*
1308 * blk_plug permits building a queue of related requests by holding the I/O
1309 * fragments for a short period. This allows merging of sequential requests
1310 * into single larger request. As the requests are moved from a per-task list to
1311 * the device's request_queue in a batch, this results in improved scalability
1312 * as the lock contention for request_queue lock is reduced.
1313 *
1314 * It is ok not to disable preemption when adding the request to the plug list
1315 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1316 * the plug list when the task sleeps by itself. For details, please see
1317 * schedule() where blk_schedule_flush_plug() is called.
1318 */
1319struct blk_plug {
1320 struct list_head list; /* requests */
1321 struct list_head mq_list; /* blk-mq requests */
1322 struct list_head cb_list; /* md requires an unplug callback */
1323};
1324#define BLK_MAX_REQUEST_COUNT 16
1325#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1326
1327struct blk_plug_cb;
1328typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1329struct blk_plug_cb {
1330 struct list_head list;
1331 blk_plug_cb_fn callback;
1332 void *data;
1333};
1334extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1335 void *data, int size);
1336extern void blk_start_plug(struct blk_plug *);
1337extern void blk_finish_plug(struct blk_plug *);
1338extern void blk_flush_plug_list(struct blk_plug *, bool);
1339
1340static inline void blk_flush_plug(struct task_struct *tsk)
1341{
1342 struct blk_plug *plug = tsk->plug;
1343
1344 if (plug)
1345 blk_flush_plug_list(plug, false);
1346}
1347
1348static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1349{
1350 struct blk_plug *plug = tsk->plug;
1351
1352 if (plug)
1353 blk_flush_plug_list(plug, true);
1354}
1355
1356static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1357{
1358 struct blk_plug *plug = tsk->plug;
1359
1360 return plug &&
1361 (!list_empty(&plug->list) ||
1362 !list_empty(&plug->mq_list) ||
1363 !list_empty(&plug->cb_list));
1364}
1365
1366/*
1367 * tag stuff
1368 */
1369extern int blk_queue_start_tag(struct request_queue *, struct request *);
1370extern struct request *blk_queue_find_tag(struct request_queue *, int);
1371extern void blk_queue_end_tag(struct request_queue *, struct request *);
1372extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
1373extern void blk_queue_free_tags(struct request_queue *);
1374extern int blk_queue_resize_tags(struct request_queue *, int);
1375extern struct blk_queue_tag *blk_init_tags(int, int);
1376extern void blk_free_tags(struct blk_queue_tag *);
1377
1378static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1379 int tag)
1380{
1381 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1382 return NULL;
1383 return bqt->tag_index[tag];
1384}
1385
1386extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1387extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1388 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1389
1390#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
1391
1392extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1393 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1394extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1395 sector_t nr_sects, gfp_t gfp_mask, int flags,
1396 struct bio **biop);
1397
1398#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
1399#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
1400
1401extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1402 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1403 unsigned flags);
1404extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1405 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1406
1407static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1408 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
1409{
1410 return blkdev_issue_discard(sb->s_bdev,
1411 block << (sb->s_blocksize_bits -
1412 SECTOR_SHIFT),
1413 nr_blocks << (sb->s_blocksize_bits -
1414 SECTOR_SHIFT),
1415 gfp_mask, flags);
1416}
1417static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1418 sector_t nr_blocks, gfp_t gfp_mask)
1419{
1420 return blkdev_issue_zeroout(sb->s_bdev,
1421 block << (sb->s_blocksize_bits -
1422 SECTOR_SHIFT),
1423 nr_blocks << (sb->s_blocksize_bits -
1424 SECTOR_SHIFT),
1425 gfp_mask, 0);
1426}
1427
1428extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1429
1430enum blk_default_limits {
1431 BLK_MAX_SEGMENTS = 128,
1432 BLK_SAFE_MAX_SECTORS = 255,
1433 BLK_DEF_MAX_SECTORS = 2560,
1434 BLK_MAX_SEGMENT_SIZE = 65536,
1435 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1436};
1437
1438static inline unsigned long queue_segment_boundary(struct request_queue *q)
1439{
1440 return q->limits.seg_boundary_mask;
1441}
1442
1443static inline unsigned long queue_virt_boundary(struct request_queue *q)
1444{
1445 return q->limits.virt_boundary_mask;
1446}
1447
1448static inline unsigned int queue_max_sectors(struct request_queue *q)
1449{
1450 return q->limits.max_sectors;
1451}
1452
1453static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1454{
1455 return q->limits.max_hw_sectors;
1456}
1457
1458static inline unsigned short queue_max_segments(struct request_queue *q)
1459{
1460 return q->limits.max_segments;
1461}
1462
1463static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1464{
1465 return q->limits.max_discard_segments;
1466}
1467
1468static inline unsigned int queue_max_segment_size(struct request_queue *q)
1469{
1470 return q->limits.max_segment_size;
1471}
1472
1473static inline unsigned short queue_logical_block_size(struct request_queue *q)
1474{
1475 int retval = 512;
1476
1477 if (q && q->limits.logical_block_size)
1478 retval = q->limits.logical_block_size;
1479
1480 return retval;
1481}
1482
1483static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1484{
1485 return queue_logical_block_size(bdev_get_queue(bdev));
1486}
1487
1488static inline unsigned int queue_physical_block_size(struct request_queue *q)
1489{
1490 return q->limits.physical_block_size;
1491}
1492
1493static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
1494{
1495 return queue_physical_block_size(bdev_get_queue(bdev));
1496}
1497
1498static inline unsigned int queue_io_min(struct request_queue *q)
1499{
1500 return q->limits.io_min;
1501}
1502
1503static inline int bdev_io_min(struct block_device *bdev)
1504{
1505 return queue_io_min(bdev_get_queue(bdev));
1506}
1507
1508static inline unsigned int queue_io_opt(struct request_queue *q)
1509{
1510 return q->limits.io_opt;
1511}
1512
1513static inline int bdev_io_opt(struct block_device *bdev)
1514{
1515 return queue_io_opt(bdev_get_queue(bdev));
1516}
1517
1518static inline int queue_alignment_offset(struct request_queue *q)
1519{
1520 if (q->limits.misaligned)
1521 return -1;
1522
1523 return q->limits.alignment_offset;
1524}
1525
1526static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1527{
1528 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1529 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
1530 << SECTOR_SHIFT;
1531
1532 return (granularity + lim->alignment_offset - alignment) % granularity;
1533}
1534
1535static inline int bdev_alignment_offset(struct block_device *bdev)
1536{
1537 struct request_queue *q = bdev_get_queue(bdev);
1538
1539 if (q->limits.misaligned)
1540 return -1;
1541
1542 if (bdev != bdev->bd_contains)
1543 return bdev->bd_part->alignment_offset;
1544
1545 return q->limits.alignment_offset;
1546}
1547
1548static inline int queue_discard_alignment(struct request_queue *q)
1549{
1550 if (q->limits.discard_misaligned)
1551 return -1;
1552
1553 return q->limits.discard_alignment;
1554}
1555
1556static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1557{
1558 unsigned int alignment, granularity, offset;
1559
1560 if (!lim->max_discard_sectors)
1561 return 0;
1562
1563 /* Why are these in bytes, not sectors? */
1564 alignment = lim->discard_alignment >> SECTOR_SHIFT;
1565 granularity = lim->discard_granularity >> SECTOR_SHIFT;
1566 if (!granularity)
1567 return 0;
1568
1569 /* Offset of the partition start in 'granularity' sectors */
1570 offset = sector_div(sector, granularity);
1571
1572 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1573 offset = (granularity + alignment - offset) % granularity;
1574
1575 /* Turn it back into bytes, gaah */
1576 return offset << SECTOR_SHIFT;
1577}
1578
1579static inline int bdev_discard_alignment(struct block_device *bdev)
1580{
1581 struct request_queue *q = bdev_get_queue(bdev);
1582
1583 if (bdev != bdev->bd_contains)
1584 return bdev->bd_part->discard_alignment;
1585
1586 return q->limits.discard_alignment;
1587}
1588
1589static inline unsigned int bdev_write_same(struct block_device *bdev)
1590{
1591 struct request_queue *q = bdev_get_queue(bdev);
1592
1593 if (q)
1594 return q->limits.max_write_same_sectors;
1595
1596 return 0;
1597}
1598
1599static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1600{
1601 struct request_queue *q = bdev_get_queue(bdev);
1602
1603 if (q)
1604 return q->limits.max_write_zeroes_sectors;
1605
1606 return 0;
1607}
1608
1609static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1610{
1611 struct request_queue *q = bdev_get_queue(bdev);
1612
1613 if (q)
1614 return blk_queue_zoned_model(q);
1615
1616 return BLK_ZONED_NONE;
1617}
1618
1619static inline bool bdev_is_zoned(struct block_device *bdev)
1620{
1621 struct request_queue *q = bdev_get_queue(bdev);
1622
1623 if (q)
1624 return blk_queue_is_zoned(q);
1625
1626 return false;
1627}
1628
1629static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
1630{
1631 struct request_queue *q = bdev_get_queue(bdev);
1632
1633 if (q)
1634 return blk_queue_zone_sectors(q);
1635 return 0;
1636}
1637
1638static inline int queue_dma_alignment(struct request_queue *q)
1639{
1640 return q ? q->dma_alignment : 511;
1641}
1642
1643static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1644 unsigned int len)
1645{
1646 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1647 return !(addr & alignment) && !(len & alignment);
1648}
1649
1650/* assumes size > 256 */
1651static inline unsigned int blksize_bits(unsigned int size)
1652{
1653 unsigned int bits = 8;
1654 do {
1655 bits++;
1656 size >>= 1;
1657 } while (size > 256);
1658 return bits;
1659}
1660
1661static inline unsigned int block_size(struct block_device *bdev)
1662{
1663 return bdev->bd_block_size;
1664}
1665
1666static inline bool queue_flush_queueable(struct request_queue *q)
1667{
1668 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
1669}
1670
1671typedef struct {struct page *v;} Sector;
1672
1673unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1674
1675static inline void put_dev_sector(Sector p)
1676{
1677 put_page(p.v);
1678}
1679
1680int kblockd_schedule_work(struct work_struct *work);
1681int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1682int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1683
1684#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1685 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1686#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1687 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1688
1689#if defined(CONFIG_BLK_DEV_INTEGRITY)
1690
1691enum blk_integrity_flags {
1692 BLK_INTEGRITY_VERIFY = 1 << 0,
1693 BLK_INTEGRITY_GENERATE = 1 << 1,
1694 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
1695 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
1696};
1697
1698struct blk_integrity_iter {
1699 void *prot_buf;
1700 void *data_buf;
1701 sector_t seed;
1702 unsigned int data_size;
1703 unsigned short interval;
1704 const char *disk_name;
1705};
1706
1707typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1708
1709struct blk_integrity_profile {
1710 integrity_processing_fn *generate_fn;
1711 integrity_processing_fn *verify_fn;
1712 const char *name;
1713};
1714
1715extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1716extern void blk_integrity_unregister(struct gendisk *);
1717extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1718extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1719 struct scatterlist *);
1720extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1721extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1722 struct request *);
1723extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1724 struct bio *);
1725
1726static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1727{
1728 struct blk_integrity *bi = &disk->queue->integrity;
1729
1730 if (!bi->profile)
1731 return NULL;
1732
1733 return bi;
1734}
1735
1736static inline
1737struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1738{
1739 return blk_get_integrity(bdev->bd_disk);
1740}
1741
1742static inline bool blk_integrity_rq(struct request *rq)
1743{
1744 return rq->cmd_flags & REQ_INTEGRITY;
1745}
1746
1747static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1748 unsigned int segs)
1749{
1750 q->limits.max_integrity_segments = segs;
1751}
1752
1753static inline unsigned short
1754queue_max_integrity_segments(struct request_queue *q)
1755{
1756 return q->limits.max_integrity_segments;
1757}
1758
1759/**
1760 * bio_integrity_intervals - Return number of integrity intervals for a bio
1761 * @bi: blk_integrity profile for device
1762 * @sectors: Size of the bio in 512-byte sectors
1763 *
1764 * Description: The block layer calculates everything in 512 byte
1765 * sectors but integrity metadata is done in terms of the data integrity
1766 * interval size of the storage device. Convert the block layer sectors
1767 * to the appropriate number of integrity intervals.
1768 */
1769static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1770 unsigned int sectors)
1771{
1772 return sectors >> (bi->interval_exp - 9);
1773}
1774
1775static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1776 unsigned int sectors)
1777{
1778 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
1779}
1780
1781#else /* CONFIG_BLK_DEV_INTEGRITY */
1782
1783struct bio;
1784struct block_device;
1785struct gendisk;
1786struct blk_integrity;
1787
1788static inline int blk_integrity_rq(struct request *rq)
1789{
1790 return 0;
1791}
1792static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1793 struct bio *b)
1794{
1795 return 0;
1796}
1797static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1798 struct bio *b,
1799 struct scatterlist *s)
1800{
1801 return 0;
1802}
1803static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1804{
1805 return NULL;
1806}
1807static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1808{
1809 return NULL;
1810}
1811static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1812{
1813 return 0;
1814}
1815static inline void blk_integrity_register(struct gendisk *d,
1816 struct blk_integrity *b)
1817{
1818}
1819static inline void blk_integrity_unregister(struct gendisk *d)
1820{
1821}
1822static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1823 unsigned int segs)
1824{
1825}
1826static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1827{
1828 return 0;
1829}
1830static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1831 struct request *r1,
1832 struct request *r2)
1833{
1834 return true;
1835}
1836static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1837 struct request *r,
1838 struct bio *b)
1839{
1840 return true;
1841}
1842
1843static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
1844 unsigned int sectors)
1845{
1846 return 0;
1847}
1848
1849static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
1850 unsigned int sectors)
1851{
1852 return 0;
1853}
1854
1855#endif /* CONFIG_BLK_DEV_INTEGRITY */
1856
1857struct block_device_operations {
1858 int (*open) (struct block_device *, fmode_t);
1859 void (*release) (struct gendisk *, fmode_t);
1860 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
1861 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1862 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1863 unsigned int (*check_events) (struct gendisk *disk,
1864 unsigned int clearing);
1865 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
1866 int (*media_changed) (struct gendisk *);
1867 void (*unlock_native_capacity) (struct gendisk *);
1868 int (*revalidate_disk) (struct gendisk *);
1869 int (*getgeo)(struct block_device *, struct hd_geometry *);
1870 /* this callback is with swap_lock and sometimes page table lock held */
1871 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1872 int (*report_zones)(struct gendisk *, sector_t sector,
1873 struct blk_zone *zones, unsigned int *nr_zones,
1874 gfp_t gfp_mask);
1875 struct module *owner;
1876 const struct pr_ops *pr_ops;
1877};
1878
1879extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1880 unsigned long);
1881extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1882extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1883 struct writeback_control *);
1884
1885#ifdef CONFIG_BLK_DEV_ZONED
1886bool blk_req_needs_zone_write_lock(struct request *rq);
1887void __blk_req_zone_write_lock(struct request *rq);
1888void __blk_req_zone_write_unlock(struct request *rq);
1889
1890static inline void blk_req_zone_write_lock(struct request *rq)
1891{
1892 if (blk_req_needs_zone_write_lock(rq))
1893 __blk_req_zone_write_lock(rq);
1894}
1895
1896static inline void blk_req_zone_write_unlock(struct request *rq)
1897{
1898 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
1899 __blk_req_zone_write_unlock(rq);
1900}
1901
1902static inline bool blk_req_zone_is_write_locked(struct request *rq)
1903{
1904 return rq->q->seq_zones_wlock &&
1905 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
1906}
1907
1908static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1909{
1910 if (!blk_req_needs_zone_write_lock(rq))
1911 return true;
1912 return !blk_req_zone_is_write_locked(rq);
1913}
1914#else
1915static inline bool blk_req_needs_zone_write_lock(struct request *rq)
1916{
1917 return false;
1918}
1919
1920static inline void blk_req_zone_write_lock(struct request *rq)
1921{
1922}
1923
1924static inline void blk_req_zone_write_unlock(struct request *rq)
1925{
1926}
1927static inline bool blk_req_zone_is_write_locked(struct request *rq)
1928{
1929 return false;
1930}
1931
1932static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
1933{
1934 return true;
1935}
1936#endif /* CONFIG_BLK_DEV_ZONED */
1937
1938#else /* CONFIG_BLOCK */
1939
1940struct block_device;
1941
1942/*
1943 * stubs for when the block layer is configured out
1944 */
1945#define buffer_heads_over_limit 0
1946
1947static inline long nr_blockdev_pages(void)
1948{
1949 return 0;
1950}
1951
1952struct blk_plug {
1953};
1954
1955static inline void blk_start_plug(struct blk_plug *plug)
1956{
1957}
1958
1959static inline void blk_finish_plug(struct blk_plug *plug)
1960{
1961}
1962
1963static inline void blk_flush_plug(struct task_struct *task)
1964{
1965}
1966
1967static inline void blk_schedule_flush_plug(struct task_struct *task)
1968{
1969}
1970
1971
1972static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1973{
1974 return false;
1975}
1976
1977static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1978 sector_t *error_sector)
1979{
1980 return 0;
1981}
1982
1983#endif /* CONFIG_BLOCK */
1984
1985#endif
Linux 6.x block layer and io_uring tree(s)