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CommitLineData
1da177e4
LT
1#ifndef _LINUX_BLKDEV_H
2#define _LINUX_BLKDEV_H
3
85fd0bc9 4#include <linux/sched.h>
e6017571 5#include <linux/sched/clock.h>
85fd0bc9 6
f5ff8422
JA
7#ifdef CONFIG_BLOCK
8
1da177e4
LT
9#include <linux/major.h>
10#include <linux/genhd.h>
11#include <linux/list.h>
320ae51f 12#include <linux/llist.h>
1da177e4
LT
13#include <linux/timer.h>
14#include <linux/workqueue.h>
15#include <linux/pagemap.h>
66114cad 16#include <linux/backing-dev-defs.h>
1da177e4
LT
17#include <linux/wait.h>
18#include <linux/mempool.h>
34c0fd54 19#include <linux/pfn.h>
1da177e4 20#include <linux/bio.h>
1da177e4 21#include <linux/stringify.h>
3e6053d7 22#include <linux/gfp.h>
d351af01 23#include <linux/bsg.h>
c7c22e4d 24#include <linux/smp.h>
548bc8e1 25#include <linux/rcupdate.h>
add703fd 26#include <linux/percpu-refcount.h>
84be456f 27#include <linux/scatterlist.h>
6a0cb1bc 28#include <linux/blkzoned.h>
1da177e4 29
de477254 30struct module;
21b2f0c8
CH
31struct scsi_ioctl_command;
32
1da177e4 33struct request_queue;
1da177e4 34struct elevator_queue;
2056a782 35struct blk_trace;
3d6392cf
JA
36struct request;
37struct sg_io_hdr;
aa387cc8 38struct bsg_job;
3c798398 39struct blkcg_gq;
7c94e1c1 40struct blk_flush_queue;
bbd3e064 41struct pr_ops;
87760e5e 42struct rq_wb;
34dbad5d
OS
43struct blk_queue_stats;
44struct blk_stat_callback;
1da177e4
LT
45
46#define BLKDEV_MIN_RQ 4
47#define BLKDEV_MAX_RQ 128 /* Default maximum */
48
8bd435b3
TH
49/*
50 * Maximum number of blkcg policies allowed to be registered concurrently.
51 * Defined here to simplify include dependency.
52 */
e21b7a0b 53#define BLKCG_MAX_POLS 3
8bd435b3 54
8ffdc655 55typedef void (rq_end_io_fn)(struct request *, int);
1da177e4 56
5b788ce3
TH
57#define BLK_RL_SYNCFULL (1U << 0)
58#define BLK_RL_ASYNCFULL (1U << 1)
59
1da177e4 60struct request_list {
5b788ce3 61 struct request_queue *q; /* the queue this rl belongs to */
a051661c
TH
62#ifdef CONFIG_BLK_CGROUP
63 struct blkcg_gq *blkg; /* blkg this request pool belongs to */
64#endif
1faa16d2
JA
65 /*
66 * count[], starved[], and wait[] are indexed by
67 * BLK_RW_SYNC/BLK_RW_ASYNC
68 */
8a5ecdd4
TH
69 int count[2];
70 int starved[2];
71 mempool_t *rq_pool;
72 wait_queue_head_t wait[2];
5b788ce3 73 unsigned int flags;
1da177e4
LT
74};
75
e8064021
CH
76/*
77 * request flags */
78typedef __u32 __bitwise req_flags_t;
79
80/* elevator knows about this request */
81#define RQF_SORTED ((__force req_flags_t)(1 << 0))
82/* drive already may have started this one */
83#define RQF_STARTED ((__force req_flags_t)(1 << 1))
84/* uses tagged queueing */
85#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
86/* may not be passed by ioscheduler */
87#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
88/* request for flush sequence */
89#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
90/* merge of different types, fail separately */
91#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
92/* track inflight for MQ */
93#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
94/* don't call prep for this one */
95#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
96/* set for "ide_preempt" requests and also for requests for which the SCSI
97 "quiesce" state must be ignored. */
98#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
99/* contains copies of user pages */
100#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
101/* vaguely specified driver internal error. Ignored by the block layer */
102#define RQF_FAILED ((__force req_flags_t)(1 << 10))
103/* don't warn about errors */
104#define RQF_QUIET ((__force req_flags_t)(1 << 11))
105/* elevator private data attached */
106#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
107/* account I/O stat */
108#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
109/* request came from our alloc pool */
110#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
111/* runtime pm request */
112#define RQF_PM ((__force req_flags_t)(1 << 15))
113/* on IO scheduler merge hash */
114#define RQF_HASHED ((__force req_flags_t)(1 << 16))
cf43e6be
JA
115/* IO stats tracking on */
116#define RQF_STATS ((__force req_flags_t)(1 << 17))
f9d03f96
CH
117/* Look at ->special_vec for the actual data payload instead of the
118 bio chain. */
119#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
e8064021
CH
120
121/* flags that prevent us from merging requests: */
122#define RQF_NOMERGE_FLAGS \
f9d03f96 123 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
e8064021 124
1da177e4 125/*
af76e555
CH
126 * Try to put the fields that are referenced together in the same cacheline.
127 *
128 * If you modify this structure, make sure to update blk_rq_init() and
129 * especially blk_mq_rq_ctx_init() to take care of the added fields.
1da177e4
LT
130 */
131struct request {
6897fc22 132 struct list_head queuelist;
320ae51f
JA
133 union {
134 struct call_single_data csd;
9828c2c6 135 u64 fifo_time;
320ae51f 136 };
ff856bad 137
165125e1 138 struct request_queue *q;
320ae51f 139 struct blk_mq_ctx *mq_ctx;
e6a1c874 140
ca93e453 141 int cpu;
ef295ecf 142 unsigned int cmd_flags; /* op and common flags */
e8064021 143 req_flags_t rq_flags;
d486f1f2
JA
144
145 int internal_tag;
146
242f9dcb 147 unsigned long atomic_flags;
1da177e4 148
a2dec7b3 149 /* the following two fields are internal, NEVER access directly */
a2dec7b3 150 unsigned int __data_len; /* total data len */
bd166ef1 151 int tag;
181fdde3 152 sector_t __sector; /* sector cursor */
1da177e4
LT
153
154 struct bio *bio;
155 struct bio *biotail;
156
360f92c2
JA
157 /*
158 * The hash is used inside the scheduler, and killed once the
159 * request reaches the dispatch list. The ipi_list is only used
160 * to queue the request for softirq completion, which is long
161 * after the request has been unhashed (and even removed from
162 * the dispatch list).
163 */
164 union {
165 struct hlist_node hash; /* merge hash */
166 struct list_head ipi_list;
167 };
168
e6a1c874
JA
169 /*
170 * The rb_node is only used inside the io scheduler, requests
171 * are pruned when moved to the dispatch queue. So let the
c186794d 172 * completion_data share space with the rb_node.
e6a1c874
JA
173 */
174 union {
175 struct rb_node rb_node; /* sort/lookup */
f9d03f96 176 struct bio_vec special_vec;
c186794d 177 void *completion_data;
e6a1c874 178 };
9817064b 179
ff7d145f 180 /*
7f1dc8a2 181 * Three pointers are available for the IO schedulers, if they need
c186794d
MS
182 * more they have to dynamically allocate it. Flush requests are
183 * never put on the IO scheduler. So let the flush fields share
a612fddf 184 * space with the elevator data.
ff7d145f 185 */
c186794d 186 union {
a612fddf
TH
187 struct {
188 struct io_cq *icq;
189 void *priv[2];
190 } elv;
191
c186794d
MS
192 struct {
193 unsigned int seq;
194 struct list_head list;
4853abaa 195 rq_end_io_fn *saved_end_io;
c186794d
MS
196 } flush;
197 };
ff7d145f 198
8f34ee75 199 struct gendisk *rq_disk;
09e099d4 200 struct hd_struct *part;
1da177e4 201 unsigned long start_time;
cf43e6be 202 struct blk_issue_stat issue_stat;
9195291e 203#ifdef CONFIG_BLK_CGROUP
a051661c 204 struct request_list *rl; /* rl this rq is alloced from */
9195291e
DS
205 unsigned long long start_time_ns;
206 unsigned long long io_start_time_ns; /* when passed to hardware */
207#endif
1da177e4
LT
208 /* Number of scatter-gather DMA addr+len pairs after
209 * physical address coalescing is performed.
210 */
211 unsigned short nr_phys_segments;
13f05c8d
MP
212#if defined(CONFIG_BLK_DEV_INTEGRITY)
213 unsigned short nr_integrity_segments;
214#endif
1da177e4 215
8f34ee75
JA
216 unsigned short ioprio;
217
1dd5198b
JA
218 unsigned int timeout;
219
731ec497 220 void *special; /* opaque pointer available for LLD use */
1da177e4 221
cdd60262
JA
222 int errors;
223
7a85f889 224 unsigned int extra_len; /* length of alignment and padding */
1da177e4 225
242f9dcb
JA
226 unsigned long deadline;
227 struct list_head timeout_list;
1da177e4 228
1da177e4 229 /*
c00895ab 230 * completion callback.
1da177e4
LT
231 */
232 rq_end_io_fn *end_io;
233 void *end_io_data;
abae1fde
FT
234
235 /* for bidi */
236 struct request *next_rq;
1da177e4
LT
237};
238
aebf526b
CH
239static inline bool blk_rq_is_scsi(struct request *rq)
240{
241 return req_op(rq) == REQ_OP_SCSI_IN || req_op(rq) == REQ_OP_SCSI_OUT;
242}
243
244static inline bool blk_rq_is_private(struct request *rq)
245{
246 return req_op(rq) == REQ_OP_DRV_IN || req_op(rq) == REQ_OP_DRV_OUT;
247}
248
57292b58
CH
249static inline bool blk_rq_is_passthrough(struct request *rq)
250{
aebf526b 251 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
57292b58
CH
252}
253
766ca442
FLVC
254static inline unsigned short req_get_ioprio(struct request *req)
255{
256 return req->ioprio;
257}
258
1da177e4
LT
259#include <linux/elevator.h>
260
320ae51f
JA
261struct blk_queue_ctx;
262
165125e1 263typedef void (request_fn_proc) (struct request_queue *q);
dece1635 264typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
165125e1 265typedef int (prep_rq_fn) (struct request_queue *, struct request *);
28018c24 266typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
1da177e4
LT
267
268struct bio_vec;
ff856bad 269typedef void (softirq_done_fn)(struct request *);
2fb98e84 270typedef int (dma_drain_needed_fn)(struct request *);
ef9e3fac 271typedef int (lld_busy_fn) (struct request_queue *q);
aa387cc8 272typedef int (bsg_job_fn) (struct bsg_job *);
6d247d7f
CH
273typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t);
274typedef void (exit_rq_fn)(struct request_queue *, struct request *);
1da177e4 275
242f9dcb
JA
276enum blk_eh_timer_return {
277 BLK_EH_NOT_HANDLED,
278 BLK_EH_HANDLED,
279 BLK_EH_RESET_TIMER,
280};
281
282typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
283
1da177e4
LT
284enum blk_queue_state {
285 Queue_down,
286 Queue_up,
287};
288
1da177e4
LT
289struct blk_queue_tag {
290 struct request **tag_index; /* map of busy tags */
291 unsigned long *tag_map; /* bit map of free/busy tags */
1da177e4 292 int max_depth; /* what we will send to device */
ba025082 293 int real_max_depth; /* what the array can hold */
1da177e4 294 atomic_t refcnt; /* map can be shared */
ee1b6f7a
SL
295 int alloc_policy; /* tag allocation policy */
296 int next_tag; /* next tag */
1da177e4 297};
ee1b6f7a
SL
298#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
299#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
1da177e4 300
abf54393
FT
301#define BLK_SCSI_MAX_CMDS (256)
302#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
303
797476b8
DLM
304/*
305 * Zoned block device models (zoned limit).
306 */
307enum blk_zoned_model {
308 BLK_ZONED_NONE, /* Regular block device */
309 BLK_ZONED_HA, /* Host-aware zoned block device */
310 BLK_ZONED_HM, /* Host-managed zoned block device */
311};
312
025146e1
MP
313struct queue_limits {
314 unsigned long bounce_pfn;
315 unsigned long seg_boundary_mask;
03100aad 316 unsigned long virt_boundary_mask;
025146e1
MP
317
318 unsigned int max_hw_sectors;
ca369d51 319 unsigned int max_dev_sectors;
762380ad 320 unsigned int chunk_sectors;
025146e1
MP
321 unsigned int max_sectors;
322 unsigned int max_segment_size;
c72758f3
MP
323 unsigned int physical_block_size;
324 unsigned int alignment_offset;
325 unsigned int io_min;
326 unsigned int io_opt;
67efc925 327 unsigned int max_discard_sectors;
0034af03 328 unsigned int max_hw_discard_sectors;
4363ac7c 329 unsigned int max_write_same_sectors;
a6f0788e 330 unsigned int max_write_zeroes_sectors;
86b37281
MP
331 unsigned int discard_granularity;
332 unsigned int discard_alignment;
025146e1
MP
333
334 unsigned short logical_block_size;
8a78362c 335 unsigned short max_segments;
13f05c8d 336 unsigned short max_integrity_segments;
1e739730 337 unsigned short max_discard_segments;
025146e1 338
c72758f3 339 unsigned char misaligned;
86b37281 340 unsigned char discard_misaligned;
e692cb66 341 unsigned char cluster;
c78afc62 342 unsigned char raid_partial_stripes_expensive;
797476b8 343 enum blk_zoned_model zoned;
025146e1
MP
344};
345
6a0cb1bc
HR
346#ifdef CONFIG_BLK_DEV_ZONED
347
348struct blk_zone_report_hdr {
349 unsigned int nr_zones;
350 u8 padding[60];
351};
352
353extern int blkdev_report_zones(struct block_device *bdev,
354 sector_t sector, struct blk_zone *zones,
355 unsigned int *nr_zones, gfp_t gfp_mask);
356extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
357 sector_t nr_sectors, gfp_t gfp_mask);
358
3ed05a98
ST
359extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
360 unsigned int cmd, unsigned long arg);
361extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
362 unsigned int cmd, unsigned long arg);
363
364#else /* CONFIG_BLK_DEV_ZONED */
365
366static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
367 fmode_t mode, unsigned int cmd,
368 unsigned long arg)
369{
370 return -ENOTTY;
371}
372
373static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
374 fmode_t mode, unsigned int cmd,
375 unsigned long arg)
376{
377 return -ENOTTY;
378}
379
6a0cb1bc
HR
380#endif /* CONFIG_BLK_DEV_ZONED */
381
d7b76301 382struct request_queue {
1da177e4
LT
383 /*
384 * Together with queue_head for cacheline sharing
385 */
386 struct list_head queue_head;
387 struct request *last_merge;
b374d18a 388 struct elevator_queue *elevator;
8a5ecdd4
TH
389 int nr_rqs[2]; /* # allocated [a]sync rqs */
390 int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
1da177e4 391
34dbad5d 392 struct blk_queue_stats *stats;
87760e5e
JA
393 struct rq_wb *rq_wb;
394
1da177e4 395 /*
a051661c
TH
396 * If blkcg is not used, @q->root_rl serves all requests. If blkcg
397 * is used, root blkg allocates from @q->root_rl and all other
398 * blkgs from their own blkg->rl. Which one to use should be
399 * determined using bio_request_list().
1da177e4 400 */
a051661c 401 struct request_list root_rl;
1da177e4
LT
402
403 request_fn_proc *request_fn;
1da177e4
LT
404 make_request_fn *make_request_fn;
405 prep_rq_fn *prep_rq_fn;
28018c24 406 unprep_rq_fn *unprep_rq_fn;
ff856bad 407 softirq_done_fn *softirq_done_fn;
242f9dcb 408 rq_timed_out_fn *rq_timed_out_fn;
2fb98e84 409 dma_drain_needed_fn *dma_drain_needed;
ef9e3fac 410 lld_busy_fn *lld_busy_fn;
6d247d7f
CH
411 init_rq_fn *init_rq_fn;
412 exit_rq_fn *exit_rq_fn;
1da177e4 413
f8a5b122 414 const struct blk_mq_ops *mq_ops;
320ae51f
JA
415
416 unsigned int *mq_map;
417
418 /* sw queues */
e6cdb092 419 struct blk_mq_ctx __percpu *queue_ctx;
320ae51f
JA
420 unsigned int nr_queues;
421
d278d4a8
JA
422 unsigned int queue_depth;
423
320ae51f
JA
424 /* hw dispatch queues */
425 struct blk_mq_hw_ctx **queue_hw_ctx;
426 unsigned int nr_hw_queues;
427
8922e16c
TH
428 /*
429 * Dispatch queue sorting
430 */
1b47f531 431 sector_t end_sector;
8922e16c 432 struct request *boundary_rq;
8922e16c 433
1da177e4 434 /*
3cca6dc1 435 * Delayed queue handling
1da177e4 436 */
3cca6dc1 437 struct delayed_work delay_work;
1da177e4 438
dc3b17cc 439 struct backing_dev_info *backing_dev_info;
1da177e4
LT
440
441 /*
442 * The queue owner gets to use this for whatever they like.
443 * ll_rw_blk doesn't touch it.
444 */
445 void *queuedata;
446
1da177e4 447 /*
d7b76301 448 * various queue flags, see QUEUE_* below
1da177e4 449 */
d7b76301 450 unsigned long queue_flags;
1da177e4 451
a73f730d
TH
452 /*
453 * ida allocated id for this queue. Used to index queues from
454 * ioctx.
455 */
456 int id;
457
1da177e4 458 /*
d7b76301 459 * queue needs bounce pages for pages above this limit
1da177e4 460 */
d7b76301 461 gfp_t bounce_gfp;
1da177e4
LT
462
463 /*
152587de
JA
464 * protects queue structures from reentrancy. ->__queue_lock should
465 * _never_ be used directly, it is queue private. always use
466 * ->queue_lock.
1da177e4 467 */
152587de 468 spinlock_t __queue_lock;
1da177e4
LT
469 spinlock_t *queue_lock;
470
471 /*
472 * queue kobject
473 */
474 struct kobject kobj;
475
320ae51f
JA
476 /*
477 * mq queue kobject
478 */
479 struct kobject mq_kobj;
480
ac6fc48c
DW
481#ifdef CONFIG_BLK_DEV_INTEGRITY
482 struct blk_integrity integrity;
483#endif /* CONFIG_BLK_DEV_INTEGRITY */
484
47fafbc7 485#ifdef CONFIG_PM
6c954667
LM
486 struct device *dev;
487 int rpm_status;
488 unsigned int nr_pending;
489#endif
490
1da177e4
LT
491 /*
492 * queue settings
493 */
494 unsigned long nr_requests; /* Max # of requests */
495 unsigned int nr_congestion_on;
496 unsigned int nr_congestion_off;
497 unsigned int nr_batching;
498
fa0ccd83 499 unsigned int dma_drain_size;
d7b76301 500 void *dma_drain_buffer;
e3790c7d 501 unsigned int dma_pad_mask;
1da177e4
LT
502 unsigned int dma_alignment;
503
504 struct blk_queue_tag *queue_tags;
6eca9004 505 struct list_head tag_busy_list;
1da177e4 506
15853af9 507 unsigned int nr_sorted;
0a7ae2ff 508 unsigned int in_flight[2];
cf43e6be 509
24faf6f6
BVA
510 /*
511 * Number of active block driver functions for which blk_drain_queue()
512 * must wait. Must be incremented around functions that unlock the
513 * queue_lock internally, e.g. scsi_request_fn().
514 */
515 unsigned int request_fn_active;
1da177e4 516
242f9dcb 517 unsigned int rq_timeout;
64f1c21e 518 int poll_nsec;
34dbad5d
OS
519
520 struct blk_stat_callback *poll_cb;
521 struct blk_rq_stat poll_stat[2];
522
242f9dcb 523 struct timer_list timeout;
287922eb 524 struct work_struct timeout_work;
242f9dcb
JA
525 struct list_head timeout_list;
526
a612fddf 527 struct list_head icq_list;
4eef3049 528#ifdef CONFIG_BLK_CGROUP
a2b1693b 529 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
3c798398 530 struct blkcg_gq *root_blkg;
03aa264a 531 struct list_head blkg_list;
4eef3049 532#endif
a612fddf 533
025146e1
MP
534 struct queue_limits limits;
535
1da177e4
LT
536 /*
537 * sg stuff
538 */
539 unsigned int sg_timeout;
540 unsigned int sg_reserved_size;
1946089a 541 int node;
6c5c9341 542#ifdef CONFIG_BLK_DEV_IO_TRACE
2056a782 543 struct blk_trace *blk_trace;
6c5c9341 544#endif
1da177e4 545 /*
4913efe4 546 * for flush operations
1da177e4 547 */
7c94e1c1 548 struct blk_flush_queue *fq;
483f4afc 549
6fca6a61
CH
550 struct list_head requeue_list;
551 spinlock_t requeue_lock;
2849450a 552 struct delayed_work requeue_work;
6fca6a61 553
483f4afc 554 struct mutex sysfs_lock;
d351af01 555
d732580b 556 int bypass_depth;
4ecd4fef 557 atomic_t mq_freeze_depth;
d732580b 558
d351af01 559#if defined(CONFIG_BLK_DEV_BSG)
aa387cc8
MC
560 bsg_job_fn *bsg_job_fn;
561 int bsg_job_size;
d351af01
FT
562 struct bsg_class_device bsg_dev;
563#endif
e43473b7
VG
564
565#ifdef CONFIG_BLK_DEV_THROTTLING
566 /* Throttle data */
567 struct throtl_data *td;
568#endif
548bc8e1 569 struct rcu_head rcu_head;
320ae51f 570 wait_queue_head_t mq_freeze_wq;
3ef28e83 571 struct percpu_ref q_usage_counter;
320ae51f 572 struct list_head all_q_node;
0d2602ca
JA
573
574 struct blk_mq_tag_set *tag_set;
575 struct list_head tag_set_list;
54efd50b 576 struct bio_set *bio_split;
4593fdbe 577
03796c14 578#ifdef CONFIG_BLK_DEBUG_FS
07e4fead
OS
579 struct dentry *debugfs_dir;
580 struct dentry *mq_debugfs_dir;
581#endif
582
4593fdbe 583 bool mq_sysfs_init_done;
6d247d7f
CH
584
585 size_t cmd_size;
586 void *rq_alloc_data;
1da177e4
LT
587};
588
1da177e4
LT
589#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
590#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
1faa16d2
JA
591#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
592#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
3f3299d5 593#define QUEUE_FLAG_DYING 5 /* queue being torn down */
d732580b 594#define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
c21e6beb
JA
595#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
596#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
5757a6d7 597#define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
c21e6beb
JA
598#define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
599#define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
600#define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
88e740f1 601#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
c21e6beb
JA
602#define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
603#define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
604#define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
605#define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
288dab8a 606#define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
5757a6d7 607#define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
c246e80d 608#define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
320ae51f 609#define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
05f1dd53 610#define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
05229bee 611#define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
93e9d8e8
JA
612#define QUEUE_FLAG_WC 23 /* Write back caching */
613#define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
c888a8f9 614#define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
163d4baa 615#define QUEUE_FLAG_DAX 26 /* device supports DAX */
cf43e6be 616#define QUEUE_FLAG_STATS 27 /* track rq completion times */
65f619d2
JA
617#define QUEUE_FLAG_POLL_STATS 28 /* collecting stats for hybrid polling */
618#define QUEUE_FLAG_REGISTERED 29 /* queue has been registered to a disk */
bc58ba94
JA
619
620#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
01e97f6b 621 (1 << QUEUE_FLAG_STACKABLE) | \
e2e1a148
JA
622 (1 << QUEUE_FLAG_SAME_COMP) | \
623 (1 << QUEUE_FLAG_ADD_RANDOM))
797e7dbb 624
94eddfbe 625#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
ad9cf3bb 626 (1 << QUEUE_FLAG_STACKABLE) | \
8e0b60b9
CH
627 (1 << QUEUE_FLAG_SAME_COMP) | \
628 (1 << QUEUE_FLAG_POLL))
94eddfbe 629
8bcb6c7d 630static inline void queue_lockdep_assert_held(struct request_queue *q)
8f45c1a5 631{
8bcb6c7d
AK
632 if (q->queue_lock)
633 lockdep_assert_held(q->queue_lock);
8f45c1a5
LT
634}
635
75ad23bc
NP
636static inline void queue_flag_set_unlocked(unsigned int flag,
637 struct request_queue *q)
638{
639 __set_bit(flag, &q->queue_flags);
640}
641
e48ec690
JA
642static inline int queue_flag_test_and_clear(unsigned int flag,
643 struct request_queue *q)
644{
8bcb6c7d 645 queue_lockdep_assert_held(q);
e48ec690
JA
646
647 if (test_bit(flag, &q->queue_flags)) {
648 __clear_bit(flag, &q->queue_flags);
649 return 1;
650 }
651
652 return 0;
653}
654
655static inline int queue_flag_test_and_set(unsigned int flag,
656 struct request_queue *q)
657{
8bcb6c7d 658 queue_lockdep_assert_held(q);
e48ec690
JA
659
660 if (!test_bit(flag, &q->queue_flags)) {
661 __set_bit(flag, &q->queue_flags);
662 return 0;
663 }
664
665 return 1;
666}
667
75ad23bc
NP
668static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
669{
8bcb6c7d 670 queue_lockdep_assert_held(q);
75ad23bc
NP
671 __set_bit(flag, &q->queue_flags);
672}
673
674static inline void queue_flag_clear_unlocked(unsigned int flag,
675 struct request_queue *q)
676{
677 __clear_bit(flag, &q->queue_flags);
678}
679
0a7ae2ff
JA
680static inline int queue_in_flight(struct request_queue *q)
681{
682 return q->in_flight[0] + q->in_flight[1];
683}
684
75ad23bc
NP
685static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
686{
8bcb6c7d 687 queue_lockdep_assert_held(q);
75ad23bc
NP
688 __clear_bit(flag, &q->queue_flags);
689}
690
1da177e4
LT
691#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
692#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
3f3299d5 693#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
c246e80d 694#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
d732580b 695#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
320ae51f 696#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
ac9fafa1 697#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
488991e2
AB
698#define blk_queue_noxmerges(q) \
699 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
a68bbddb 700#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
bc58ba94 701#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
e2e1a148 702#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
4ee5eaf4
KU
703#define blk_queue_stackable(q) \
704 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
c15227de 705#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
288dab8a
CH
706#define blk_queue_secure_erase(q) \
707 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
163d4baa 708#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
1da177e4 709
33659ebb
CH
710#define blk_noretry_request(rq) \
711 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
712 REQ_FAILFAST_DRIVER))
713
57292b58
CH
714static inline bool blk_account_rq(struct request *rq)
715{
716 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
717}
33659ebb 718
ab780f1e 719#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
abae1fde 720#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
336cdb40
KU
721/* rq->queuelist of dequeued request must be list_empty() */
722#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
1da177e4
LT
723
724#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
725
4e1b2d52 726#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
1da177e4 727
49fd524f
JA
728/*
729 * Driver can handle struct request, if it either has an old style
730 * request_fn defined, or is blk-mq based.
731 */
732static inline bool queue_is_rq_based(struct request_queue *q)
733{
734 return q->request_fn || q->mq_ops;
735}
736
e692cb66
MP
737static inline unsigned int blk_queue_cluster(struct request_queue *q)
738{
739 return q->limits.cluster;
740}
741
797476b8
DLM
742static inline enum blk_zoned_model
743blk_queue_zoned_model(struct request_queue *q)
744{
745 return q->limits.zoned;
746}
747
748static inline bool blk_queue_is_zoned(struct request_queue *q)
749{
750 switch (blk_queue_zoned_model(q)) {
751 case BLK_ZONED_HA:
752 case BLK_ZONED_HM:
753 return true;
754 default:
755 return false;
756 }
757}
758
f99e8648 759static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
6a0cb1bc
HR
760{
761 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
762}
763
1faa16d2
JA
764static inline bool rq_is_sync(struct request *rq)
765{
ef295ecf 766 return op_is_sync(rq->cmd_flags);
1faa16d2
JA
767}
768
5b788ce3 769static inline bool blk_rl_full(struct request_list *rl, bool sync)
1da177e4 770{
5b788ce3
TH
771 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
772
773 return rl->flags & flag;
1da177e4
LT
774}
775
5b788ce3 776static inline void blk_set_rl_full(struct request_list *rl, bool sync)
1da177e4 777{
5b788ce3
TH
778 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
779
780 rl->flags |= flag;
1da177e4
LT
781}
782
5b788ce3 783static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
1da177e4 784{
5b788ce3
TH
785 unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
786
787 rl->flags &= ~flag;
1da177e4
LT
788}
789
e2a60da7
MP
790static inline bool rq_mergeable(struct request *rq)
791{
57292b58 792 if (blk_rq_is_passthrough(rq))
e2a60da7 793 return false;
1da177e4 794
3a5e02ce
MC
795 if (req_op(rq) == REQ_OP_FLUSH)
796 return false;
797
a6f0788e
CK
798 if (req_op(rq) == REQ_OP_WRITE_ZEROES)
799 return false;
800
e2a60da7 801 if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
e8064021
CH
802 return false;
803 if (rq->rq_flags & RQF_NOMERGE_FLAGS)
e2a60da7
MP
804 return false;
805
806 return true;
807}
1da177e4 808
4363ac7c
MP
809static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
810{
811 if (bio_data(a) == bio_data(b))
812 return true;
813
814 return false;
815}
816
d278d4a8
JA
817static inline unsigned int blk_queue_depth(struct request_queue *q)
818{
819 if (q->queue_depth)
820 return q->queue_depth;
821
822 return q->nr_requests;
823}
824
1da177e4
LT
825/*
826 * q->prep_rq_fn return values
827 */
0fb5b1fb
MP
828enum {
829 BLKPREP_OK, /* serve it */
830 BLKPREP_KILL, /* fatal error, kill, return -EIO */
831 BLKPREP_DEFER, /* leave on queue */
832 BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
833};
1da177e4
LT
834
835extern unsigned long blk_max_low_pfn, blk_max_pfn;
836
837/*
838 * standard bounce addresses:
839 *
840 * BLK_BOUNCE_HIGH : bounce all highmem pages
841 * BLK_BOUNCE_ANY : don't bounce anything
842 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
843 */
2472892a
AK
844
845#if BITS_PER_LONG == 32
1da177e4 846#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
2472892a
AK
847#else
848#define BLK_BOUNCE_HIGH -1ULL
849#endif
850#define BLK_BOUNCE_ANY (-1ULL)
bfe17231 851#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
1da177e4 852
3d6392cf
JA
853/*
854 * default timeout for SG_IO if none specified
855 */
856#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
f2f1fa78 857#define BLK_MIN_SG_TIMEOUT (7 * HZ)
3d6392cf 858
2a7326b5 859#ifdef CONFIG_BOUNCE
1da177e4 860extern int init_emergency_isa_pool(void);
165125e1 861extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
1da177e4
LT
862#else
863static inline int init_emergency_isa_pool(void)
864{
865 return 0;
866}
165125e1 867static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
1da177e4
LT
868{
869}
870#endif /* CONFIG_MMU */
871
152e283f
FT
872struct rq_map_data {
873 struct page **pages;
874 int page_order;
875 int nr_entries;
56c451f4 876 unsigned long offset;
97ae77a1 877 int null_mapped;
ecb554a8 878 int from_user;
152e283f
FT
879};
880
5705f702 881struct req_iterator {
7988613b 882 struct bvec_iter iter;
5705f702
N
883 struct bio *bio;
884};
885
886/* This should not be used directly - use rq_for_each_segment */
1e428079
JA
887#define for_each_bio(_bio) \
888 for (; _bio; _bio = _bio->bi_next)
5705f702 889#define __rq_for_each_bio(_bio, rq) \
1da177e4
LT
890 if ((rq->bio)) \
891 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
892
5705f702
N
893#define rq_for_each_segment(bvl, _rq, _iter) \
894 __rq_for_each_bio(_iter.bio, _rq) \
7988613b 895 bio_for_each_segment(bvl, _iter.bio, _iter.iter)
5705f702 896
4550dd6c 897#define rq_iter_last(bvec, _iter) \
7988613b 898 (_iter.bio->bi_next == NULL && \
4550dd6c 899 bio_iter_last(bvec, _iter.iter))
5705f702 900
2d4dc890
IL
901#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
902# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
903#endif
904#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
905extern void rq_flush_dcache_pages(struct request *rq);
906#else
907static inline void rq_flush_dcache_pages(struct request *rq)
908{
909}
910#endif
911
2af3a815
TK
912#ifdef CONFIG_PRINTK
913#define vfs_msg(sb, level, fmt, ...) \
914 __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
915#else
916#define vfs_msg(sb, level, fmt, ...) \
917do { \
918 no_printk(fmt, ##__VA_ARGS__); \
919 __vfs_msg(sb, "", " "); \
920} while (0)
921#endif
922
1da177e4
LT
923extern int blk_register_queue(struct gendisk *disk);
924extern void blk_unregister_queue(struct gendisk *disk);
dece1635 925extern blk_qc_t generic_make_request(struct bio *bio);
2a4aa30c 926extern void blk_rq_init(struct request_queue *q, struct request *rq);
1da177e4 927extern void blk_put_request(struct request *);
165125e1 928extern void __blk_put_request(struct request_queue *, struct request *);
165125e1 929extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
165125e1 930extern void blk_requeue_request(struct request_queue *, struct request *);
ef9e3fac 931extern int blk_lld_busy(struct request_queue *q);
78d8e58a
MS
932extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
933 struct bio_set *bs, gfp_t gfp_mask,
934 int (*bio_ctr)(struct bio *, struct bio *, void *),
935 void *data);
936extern void blk_rq_unprep_clone(struct request *rq);
82124d60
KU
937extern int blk_insert_cloned_request(struct request_queue *q,
938 struct request *rq);
98d61d5b 939extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
3cca6dc1 940extern void blk_delay_queue(struct request_queue *, unsigned long);
54efd50b
KO
941extern void blk_queue_split(struct request_queue *, struct bio **,
942 struct bio_set *);
165125e1 943extern void blk_recount_segments(struct request_queue *, struct bio *);
0bfc96cb 944extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
577ebb37
PB
945extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
946 unsigned int, void __user *);
74f3c8af
AV
947extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
948 unsigned int, void __user *);
e915e872
AV
949extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
950 struct scsi_ioctl_command __user *);
3fcfab16 951
6f3b0e8b 952extern int blk_queue_enter(struct request_queue *q, bool nowait);
2e6edc95 953extern void blk_queue_exit(struct request_queue *q);
165125e1 954extern void blk_start_queue(struct request_queue *q);
21491412 955extern void blk_start_queue_async(struct request_queue *q);
165125e1 956extern void blk_stop_queue(struct request_queue *q);
1da177e4 957extern void blk_sync_queue(struct request_queue *q);
165125e1 958extern void __blk_stop_queue(struct request_queue *q);
24ecfbe2 959extern void __blk_run_queue(struct request_queue *q);
a7928c15 960extern void __blk_run_queue_uncond(struct request_queue *q);
165125e1 961extern void blk_run_queue(struct request_queue *);
c21e6beb 962extern void blk_run_queue_async(struct request_queue *q);
6a83e74d 963extern void blk_mq_quiesce_queue(struct request_queue *q);
a3bce90e 964extern int blk_rq_map_user(struct request_queue *, struct request *,
152e283f
FT
965 struct rq_map_data *, void __user *, unsigned long,
966 gfp_t);
8e5cfc45 967extern int blk_rq_unmap_user(struct bio *);
165125e1
JA
968extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
969extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
26e49cfc
KO
970 struct rq_map_data *, const struct iov_iter *,
971 gfp_t);
165125e1 972extern int blk_execute_rq(struct request_queue *, struct gendisk *,
994ca9a1 973 struct request *, int);
165125e1 974extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
15fc858a 975 struct request *, int, rq_end_io_fn *);
6e39b69e 976
bbd7bb70 977bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
05229bee 978
165125e1 979static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
1da177e4 980{
ff9ea323 981 return bdev->bd_disk->queue; /* this is never NULL */
1da177e4
LT
982}
983
5efccd17 984/*
80a761fd
TH
985 * blk_rq_pos() : the current sector
986 * blk_rq_bytes() : bytes left in the entire request
987 * blk_rq_cur_bytes() : bytes left in the current segment
988 * blk_rq_err_bytes() : bytes left till the next error boundary
989 * blk_rq_sectors() : sectors left in the entire request
990 * blk_rq_cur_sectors() : sectors left in the current segment
5efccd17 991 */
5b93629b
TH
992static inline sector_t blk_rq_pos(const struct request *rq)
993{
a2dec7b3 994 return rq->__sector;
2e46e8b2
TH
995}
996
997static inline unsigned int blk_rq_bytes(const struct request *rq)
998{
a2dec7b3 999 return rq->__data_len;
5b93629b
TH
1000}
1001
2e46e8b2
TH
1002static inline int blk_rq_cur_bytes(const struct request *rq)
1003{
1004 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
1005}
5efccd17 1006
80a761fd
TH
1007extern unsigned int blk_rq_err_bytes(const struct request *rq);
1008
5b93629b
TH
1009static inline unsigned int blk_rq_sectors(const struct request *rq)
1010{
2e46e8b2 1011 return blk_rq_bytes(rq) >> 9;
5b93629b
TH
1012}
1013
1014static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
1015{
2e46e8b2 1016 return blk_rq_cur_bytes(rq) >> 9;
5b93629b
TH
1017}
1018
2e3258ec
CH
1019/*
1020 * Some commands like WRITE SAME have a payload or data transfer size which
1021 * is different from the size of the request. Any driver that supports such
1022 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
1023 * calculate the data transfer size.
1024 */
1025static inline unsigned int blk_rq_payload_bytes(struct request *rq)
1026{
1027 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1028 return rq->special_vec.bv_len;
1029 return blk_rq_bytes(rq);
1030}
1031
f31dc1cd 1032static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
8fe0d473 1033 int op)
f31dc1cd 1034{
7afafc8a 1035 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
871dd928 1036 return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
f31dc1cd 1037
8fe0d473 1038 if (unlikely(op == REQ_OP_WRITE_SAME))
4363ac7c
MP
1039 return q->limits.max_write_same_sectors;
1040
a6f0788e
CK
1041 if (unlikely(op == REQ_OP_WRITE_ZEROES))
1042 return q->limits.max_write_zeroes_sectors;
1043
f31dc1cd
MP
1044 return q->limits.max_sectors;
1045}
1046
762380ad
JA
1047/*
1048 * Return maximum size of a request at given offset. Only valid for
1049 * file system requests.
1050 */
1051static inline unsigned int blk_max_size_offset(struct request_queue *q,
1052 sector_t offset)
1053{
1054 if (!q->limits.chunk_sectors)
736ed4de 1055 return q->limits.max_sectors;
762380ad
JA
1056
1057 return q->limits.chunk_sectors -
1058 (offset & (q->limits.chunk_sectors - 1));
1059}
1060
17007f39
DLM
1061static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
1062 sector_t offset)
f31dc1cd
MP
1063{
1064 struct request_queue *q = rq->q;
1065
57292b58 1066 if (blk_rq_is_passthrough(rq))
f31dc1cd
MP
1067 return q->limits.max_hw_sectors;
1068
7afafc8a
AH
1069 if (!q->limits.chunk_sectors ||
1070 req_op(rq) == REQ_OP_DISCARD ||
1071 req_op(rq) == REQ_OP_SECURE_ERASE)
8fe0d473 1072 return blk_queue_get_max_sectors(q, req_op(rq));
762380ad 1073
17007f39 1074 return min(blk_max_size_offset(q, offset),
8fe0d473 1075 blk_queue_get_max_sectors(q, req_op(rq)));
f31dc1cd
MP
1076}
1077
75afb352
JN
1078static inline unsigned int blk_rq_count_bios(struct request *rq)
1079{
1080 unsigned int nr_bios = 0;
1081 struct bio *bio;
1082
1083 __rq_for_each_bio(bio, rq)
1084 nr_bios++;
1085
1086 return nr_bios;
1087}
1088
5dc8b362
AM
1089/*
1090 * blk_rq_set_prio - associate a request with prio from ioc
1091 * @rq: request of interest
1092 * @ioc: target iocontext
1093 *
1094 * Assocate request prio with ioc prio so request based drivers
1095 * can leverage priority information.
1096 */
1097static inline void blk_rq_set_prio(struct request *rq, struct io_context *ioc)
1098{
1099 if (ioc)
1100 rq->ioprio = ioc->ioprio;
1101}
1102
9934c8c0
TH
1103/*
1104 * Request issue related functions.
1105 */
1106extern struct request *blk_peek_request(struct request_queue *q);
1107extern void blk_start_request(struct request *rq);
1108extern struct request *blk_fetch_request(struct request_queue *q);
1109
1da177e4 1110/*
2e60e022
TH
1111 * Request completion related functions.
1112 *
1113 * blk_update_request() completes given number of bytes and updates
1114 * the request without completing it.
1115 *
f06d9a2b
TH
1116 * blk_end_request() and friends. __blk_end_request() must be called
1117 * with the request queue spinlock acquired.
1da177e4
LT
1118 *
1119 * Several drivers define their own end_request and call
3bcddeac
KU
1120 * blk_end_request() for parts of the original function.
1121 * This prevents code duplication in drivers.
1da177e4 1122 */
2e60e022
TH
1123extern bool blk_update_request(struct request *rq, int error,
1124 unsigned int nr_bytes);
12120077 1125extern void blk_finish_request(struct request *rq, int error);
b1f74493
FT
1126extern bool blk_end_request(struct request *rq, int error,
1127 unsigned int nr_bytes);
1128extern void blk_end_request_all(struct request *rq, int error);
b1f74493
FT
1129extern bool __blk_end_request(struct request *rq, int error,
1130 unsigned int nr_bytes);
1131extern void __blk_end_request_all(struct request *rq, int error);
1132extern bool __blk_end_request_cur(struct request *rq, int error);
2e60e022 1133
ff856bad 1134extern void blk_complete_request(struct request *);
242f9dcb
JA
1135extern void __blk_complete_request(struct request *);
1136extern void blk_abort_request(struct request *);
28018c24 1137extern void blk_unprep_request(struct request *);
ff856bad 1138
1da177e4
LT
1139/*
1140 * Access functions for manipulating queue properties
1141 */
165125e1 1142extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
1946089a 1143 spinlock_t *lock, int node_id);
165125e1 1144extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
5ea708d1 1145extern int blk_init_allocated_queue(struct request_queue *);
165125e1
JA
1146extern void blk_cleanup_queue(struct request_queue *);
1147extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
1148extern void blk_queue_bounce_limit(struct request_queue *, u64);
086fa5ff 1149extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
762380ad 1150extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
8a78362c 1151extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1e739730
CH
1152extern void blk_queue_max_discard_segments(struct request_queue *,
1153 unsigned short);
165125e1 1154extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
67efc925
CH
1155extern void blk_queue_max_discard_sectors(struct request_queue *q,
1156 unsigned int max_discard_sectors);
4363ac7c
MP
1157extern void blk_queue_max_write_same_sectors(struct request_queue *q,
1158 unsigned int max_write_same_sectors);
a6f0788e
CK
1159extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
1160 unsigned int max_write_same_sectors);
e1defc4f 1161extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
892b6f90 1162extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
c72758f3
MP
1163extern void blk_queue_alignment_offset(struct request_queue *q,
1164 unsigned int alignment);
7c958e32 1165extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
c72758f3 1166extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
3c5820c7 1167extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
c72758f3 1168extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
d278d4a8 1169extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
e475bba2 1170extern void blk_set_default_limits(struct queue_limits *lim);
b1bd055d 1171extern void blk_set_stacking_limits(struct queue_limits *lim);
c72758f3
MP
1172extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
1173 sector_t offset);
17be8c24
MP
1174extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
1175 sector_t offset);
c72758f3
MP
1176extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
1177 sector_t offset);
165125e1 1178extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
e3790c7d 1179extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
27f8221a 1180extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
2fb98e84
TH
1181extern int blk_queue_dma_drain(struct request_queue *q,
1182 dma_drain_needed_fn *dma_drain_needed,
1183 void *buf, unsigned int size);
ef9e3fac 1184extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
165125e1 1185extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
03100aad 1186extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
165125e1 1187extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
28018c24 1188extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
165125e1 1189extern void blk_queue_dma_alignment(struct request_queue *, int);
11c3e689 1190extern void blk_queue_update_dma_alignment(struct request_queue *, int);
165125e1 1191extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
242f9dcb
JA
1192extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
1193extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
f3876930 1194extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
93e9d8e8 1195extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1da177e4 1196
1e739730
CH
1197/*
1198 * Number of physical segments as sent to the device.
1199 *
1200 * Normally this is the number of discontiguous data segments sent by the
1201 * submitter. But for data-less command like discard we might have no
1202 * actual data segments submitted, but the driver might have to add it's
1203 * own special payload. In that case we still return 1 here so that this
1204 * special payload will be mapped.
1205 */
f9d03f96
CH
1206static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
1207{
1208 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1209 return 1;
1210 return rq->nr_phys_segments;
1211}
1212
1e739730
CH
1213/*
1214 * Number of discard segments (or ranges) the driver needs to fill in.
1215 * Each discard bio merged into a request is counted as one segment.
1216 */
1217static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
1218{
1219 return max_t(unsigned short, rq->nr_phys_segments, 1);
1220}
1221
165125e1 1222extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
1da177e4 1223extern void blk_dump_rq_flags(struct request *, char *);
1da177e4 1224extern long nr_blockdev_pages(void);
1da177e4 1225
09ac46c4 1226bool __must_check blk_get_queue(struct request_queue *);
165125e1
JA
1227struct request_queue *blk_alloc_queue(gfp_t);
1228struct request_queue *blk_alloc_queue_node(gfp_t, int);
1229extern void blk_put_queue(struct request_queue *);
3f21c265 1230extern void blk_set_queue_dying(struct request_queue *);
1da177e4 1231
6c954667
LM
1232/*
1233 * block layer runtime pm functions
1234 */
47fafbc7 1235#ifdef CONFIG_PM
6c954667
LM
1236extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
1237extern int blk_pre_runtime_suspend(struct request_queue *q);
1238extern void blk_post_runtime_suspend(struct request_queue *q, int err);
1239extern void blk_pre_runtime_resume(struct request_queue *q);
1240extern void blk_post_runtime_resume(struct request_queue *q, int err);
d07ab6d1 1241extern void blk_set_runtime_active(struct request_queue *q);
6c954667
LM
1242#else
1243static inline void blk_pm_runtime_init(struct request_queue *q,
1244 struct device *dev) {}
1245static inline int blk_pre_runtime_suspend(struct request_queue *q)
1246{
1247 return -ENOSYS;
1248}
1249static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
1250static inline void blk_pre_runtime_resume(struct request_queue *q) {}
1251static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
9a05e754 1252static inline void blk_set_runtime_active(struct request_queue *q) {}
6c954667
LM
1253#endif
1254
316cc67d 1255/*
75df7136
SJ
1256 * blk_plug permits building a queue of related requests by holding the I/O
1257 * fragments for a short period. This allows merging of sequential requests
1258 * into single larger request. As the requests are moved from a per-task list to
1259 * the device's request_queue in a batch, this results in improved scalability
1260 * as the lock contention for request_queue lock is reduced.
1261 *
1262 * It is ok not to disable preemption when adding the request to the plug list
1263 * or when attempting a merge, because blk_schedule_flush_list() will only flush
1264 * the plug list when the task sleeps by itself. For details, please see
1265 * schedule() where blk_schedule_flush_plug() is called.
316cc67d 1266 */
73c10101 1267struct blk_plug {
75df7136 1268 struct list_head list; /* requests */
320ae51f 1269 struct list_head mq_list; /* blk-mq requests */
75df7136 1270 struct list_head cb_list; /* md requires an unplug callback */
73c10101 1271};
55c022bb 1272#define BLK_MAX_REQUEST_COUNT 16
50d24c34 1273#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
55c022bb 1274
9cbb1750 1275struct blk_plug_cb;
74018dc3 1276typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
048c9374
N
1277struct blk_plug_cb {
1278 struct list_head list;
9cbb1750
N
1279 blk_plug_cb_fn callback;
1280 void *data;
048c9374 1281};
9cbb1750
N
1282extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
1283 void *data, int size);
73c10101
JA
1284extern void blk_start_plug(struct blk_plug *);
1285extern void blk_finish_plug(struct blk_plug *);
f6603783 1286extern void blk_flush_plug_list(struct blk_plug *, bool);
73c10101
JA
1287
1288static inline void blk_flush_plug(struct task_struct *tsk)
1289{
1290 struct blk_plug *plug = tsk->plug;
1291
a237c1c5
JA
1292 if (plug)
1293 blk_flush_plug_list(plug, false);
1294}
1295
1296static inline void blk_schedule_flush_plug(struct task_struct *tsk)
1297{
1298 struct blk_plug *plug = tsk->plug;
1299
88b996cd 1300 if (plug)
f6603783 1301 blk_flush_plug_list(plug, true);
73c10101
JA
1302}
1303
1304static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1305{
1306 struct blk_plug *plug = tsk->plug;
1307
320ae51f
JA
1308 return plug &&
1309 (!list_empty(&plug->list) ||
1310 !list_empty(&plug->mq_list) ||
1311 !list_empty(&plug->cb_list));
73c10101
JA
1312}
1313
1da177e4
LT
1314/*
1315 * tag stuff
1316 */
165125e1
JA
1317extern int blk_queue_start_tag(struct request_queue *, struct request *);
1318extern struct request *blk_queue_find_tag(struct request_queue *, int);
1319extern void blk_queue_end_tag(struct request_queue *, struct request *);
ee1b6f7a 1320extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
165125e1
JA
1321extern void blk_queue_free_tags(struct request_queue *);
1322extern int blk_queue_resize_tags(struct request_queue *, int);
1323extern void blk_queue_invalidate_tags(struct request_queue *);
ee1b6f7a 1324extern struct blk_queue_tag *blk_init_tags(int, int);
492dfb48 1325extern void blk_free_tags(struct blk_queue_tag *);
1da177e4 1326
f583f492
DS
1327static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
1328 int tag)
1329{
1330 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
1331 return NULL;
1332 return bqt->tag_index[tag];
1333}
dd3932ed 1334
ee472d83
CH
1335extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
1336extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
1337 sector_t nr_sects, gfp_t gfp_mask, struct page *page);
e950fdf7
CH
1338
1339#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
dd3932ed 1340
fbd9b09a
DM
1341extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1342 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
38f25255 1343extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
288dab8a 1344 sector_t nr_sects, gfp_t gfp_mask, int flags,
469e3216 1345 struct bio **biop);
ee472d83
CH
1346
1347#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
cb365b96 1348#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
ee472d83 1349
e73c23ff
CK
1350extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1351 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
ee472d83 1352 unsigned flags);
3f14d792 1353extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
ee472d83
CH
1354 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);
1355
2cf6d26a
CH
1356static inline int sb_issue_discard(struct super_block *sb, sector_t block,
1357 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
fb2dce86 1358{
2cf6d26a
CH
1359 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
1360 nr_blocks << (sb->s_blocksize_bits - 9),
1361 gfp_mask, flags);
fb2dce86 1362}
e6fa0be6 1363static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
a107e5a3 1364 sector_t nr_blocks, gfp_t gfp_mask)
e6fa0be6
LC
1365{
1366 return blkdev_issue_zeroout(sb->s_bdev,
1367 block << (sb->s_blocksize_bits - 9),
1368 nr_blocks << (sb->s_blocksize_bits - 9),
ee472d83 1369 gfp_mask, 0);
e6fa0be6 1370}
1da177e4 1371
018e0446 1372extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
0b07de85 1373
eb28d31b
MP
1374enum blk_default_limits {
1375 BLK_MAX_SEGMENTS = 128,
1376 BLK_SAFE_MAX_SECTORS = 255,
d2be537c 1377 BLK_DEF_MAX_SECTORS = 2560,
eb28d31b
MP
1378 BLK_MAX_SEGMENT_SIZE = 65536,
1379 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
1380};
0e435ac2 1381
1da177e4
LT
1382#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
1383
ae03bf63
MP
1384static inline unsigned long queue_bounce_pfn(struct request_queue *q)
1385{
025146e1 1386 return q->limits.bounce_pfn;
ae03bf63
MP
1387}
1388
1389static inline unsigned long queue_segment_boundary(struct request_queue *q)
1390{
025146e1 1391 return q->limits.seg_boundary_mask;
ae03bf63
MP
1392}
1393
03100aad
KB
1394static inline unsigned long queue_virt_boundary(struct request_queue *q)
1395{
1396 return q->limits.virt_boundary_mask;
1397}
1398
ae03bf63
MP
1399static inline unsigned int queue_max_sectors(struct request_queue *q)
1400{
025146e1 1401 return q->limits.max_sectors;
ae03bf63
MP
1402}
1403
1404static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
1405{
025146e1 1406 return q->limits.max_hw_sectors;
ae03bf63
MP
1407}
1408
8a78362c 1409static inline unsigned short queue_max_segments(struct request_queue *q)
ae03bf63 1410{
8a78362c 1411 return q->limits.max_segments;
ae03bf63
MP
1412}
1413
1e739730
CH
1414static inline unsigned short queue_max_discard_segments(struct request_queue *q)
1415{
1416 return q->limits.max_discard_segments;
1417}
1418
ae03bf63
MP
1419static inline unsigned int queue_max_segment_size(struct request_queue *q)
1420{
025146e1 1421 return q->limits.max_segment_size;
ae03bf63
MP
1422}
1423
e1defc4f 1424static inline unsigned short queue_logical_block_size(struct request_queue *q)
1da177e4
LT
1425{
1426 int retval = 512;
1427
025146e1
MP
1428 if (q && q->limits.logical_block_size)
1429 retval = q->limits.logical_block_size;
1da177e4
LT
1430
1431 return retval;
1432}
1433
e1defc4f 1434static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
1da177e4 1435{
e1defc4f 1436 return queue_logical_block_size(bdev_get_queue(bdev));
1da177e4
LT
1437}
1438
c72758f3
MP
1439static inline unsigned int queue_physical_block_size(struct request_queue *q)
1440{
1441 return q->limits.physical_block_size;
1442}
1443
892b6f90 1444static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
ac481c20
MP
1445{
1446 return queue_physical_block_size(bdev_get_queue(bdev));
1447}
1448
c72758f3
MP
1449static inline unsigned int queue_io_min(struct request_queue *q)
1450{
1451 return q->limits.io_min;
1452}
1453
ac481c20
MP
1454static inline int bdev_io_min(struct block_device *bdev)
1455{
1456 return queue_io_min(bdev_get_queue(bdev));
1457}
1458
c72758f3
MP
1459static inline unsigned int queue_io_opt(struct request_queue *q)
1460{
1461 return q->limits.io_opt;
1462}
1463
ac481c20
MP
1464static inline int bdev_io_opt(struct block_device *bdev)
1465{
1466 return queue_io_opt(bdev_get_queue(bdev));
1467}
1468
c72758f3
MP
1469static inline int queue_alignment_offset(struct request_queue *q)
1470{
ac481c20 1471 if (q->limits.misaligned)
c72758f3
MP
1472 return -1;
1473
ac481c20 1474 return q->limits.alignment_offset;
c72758f3
MP
1475}
1476
e03a72e1 1477static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
81744ee4
MP
1478{
1479 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
b8839b8c 1480 unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
81744ee4 1481
b8839b8c 1482 return (granularity + lim->alignment_offset - alignment) % granularity;
c72758f3
MP
1483}
1484
ac481c20
MP
1485static inline int bdev_alignment_offset(struct block_device *bdev)
1486{
1487 struct request_queue *q = bdev_get_queue(bdev);
1488
1489 if (q->limits.misaligned)
1490 return -1;
1491
1492 if (bdev != bdev->bd_contains)
1493 return bdev->bd_part->alignment_offset;
1494
1495 return q->limits.alignment_offset;
1496}
1497
86b37281
MP
1498static inline int queue_discard_alignment(struct request_queue *q)
1499{
1500 if (q->limits.discard_misaligned)
1501 return -1;
1502
1503 return q->limits.discard_alignment;
1504}
1505
e03a72e1 1506static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
86b37281 1507{
59771079 1508 unsigned int alignment, granularity, offset;
dd3d145d 1509
a934a00a
MP
1510 if (!lim->max_discard_sectors)
1511 return 0;
1512
59771079
LT
1513 /* Why are these in bytes, not sectors? */
1514 alignment = lim->discard_alignment >> 9;
1515 granularity = lim->discard_granularity >> 9;
1516 if (!granularity)
1517 return 0;
1518
1519 /* Offset of the partition start in 'granularity' sectors */
1520 offset = sector_div(sector, granularity);
1521
1522 /* And why do we do this modulus *again* in blkdev_issue_discard()? */
1523 offset = (granularity + alignment - offset) % granularity;
1524
1525 /* Turn it back into bytes, gaah */
1526 return offset << 9;
86b37281
MP
1527}
1528
c6e66634
PB
1529static inline int bdev_discard_alignment(struct block_device *bdev)
1530{
1531 struct request_queue *q = bdev_get_queue(bdev);
1532
1533 if (bdev != bdev->bd_contains)
1534 return bdev->bd_part->discard_alignment;
1535
1536 return q->limits.discard_alignment;
1537}
1538
4363ac7c
MP
1539static inline unsigned int bdev_write_same(struct block_device *bdev)
1540{
1541 struct request_queue *q = bdev_get_queue(bdev);
1542
1543 if (q)
1544 return q->limits.max_write_same_sectors;
1545
1546 return 0;
1547}
1548
a6f0788e
CK
1549static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
1550{
1551 struct request_queue *q = bdev_get_queue(bdev);
1552
1553 if (q)
1554 return q->limits.max_write_zeroes_sectors;
1555
1556 return 0;
1557}
1558
797476b8
DLM
1559static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
1560{
1561 struct request_queue *q = bdev_get_queue(bdev);
1562
1563 if (q)
1564 return blk_queue_zoned_model(q);
1565
1566 return BLK_ZONED_NONE;
1567}
1568
1569static inline bool bdev_is_zoned(struct block_device *bdev)
1570{
1571 struct request_queue *q = bdev_get_queue(bdev);
1572
1573 if (q)
1574 return blk_queue_is_zoned(q);
1575
1576 return false;
1577}
1578
f99e8648 1579static inline unsigned int bdev_zone_sectors(struct block_device *bdev)
6a0cb1bc
HR
1580{
1581 struct request_queue *q = bdev_get_queue(bdev);
1582
1583 if (q)
f99e8648 1584 return blk_queue_zone_sectors(q);
6a0cb1bc
HR
1585
1586 return 0;
1587}
1588
165125e1 1589static inline int queue_dma_alignment(struct request_queue *q)
1da177e4 1590{
482eb689 1591 return q ? q->dma_alignment : 511;
1da177e4
LT
1592}
1593
14417799 1594static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
87904074
FT
1595 unsigned int len)
1596{
1597 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
14417799 1598 return !(addr & alignment) && !(len & alignment);
87904074
FT
1599}
1600
1da177e4
LT
1601/* assumes size > 256 */
1602static inline unsigned int blksize_bits(unsigned int size)
1603{
1604 unsigned int bits = 8;
1605 do {
1606 bits++;
1607 size >>= 1;
1608 } while (size > 256);
1609 return bits;
1610}
1611
2befb9e3 1612static inline unsigned int block_size(struct block_device *bdev)
1da177e4
LT
1613{
1614 return bdev->bd_block_size;
1615}
1616
f3876930 1617static inline bool queue_flush_queueable(struct request_queue *q)
1618{
c888a8f9 1619 return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
f3876930 1620}
1621
1da177e4
LT
1622typedef struct {struct page *v;} Sector;
1623
1624unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1625
1626static inline void put_dev_sector(Sector p)
1627{
09cbfeaf 1628 put_page(p.v);
1da177e4
LT
1629}
1630
e0af2917
ML
1631static inline bool __bvec_gap_to_prev(struct request_queue *q,
1632 struct bio_vec *bprv, unsigned int offset)
1633{
1634 return offset ||
1635 ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
1636}
1637
03100aad
KB
1638/*
1639 * Check if adding a bio_vec after bprv with offset would create a gap in
1640 * the SG list. Most drivers don't care about this, but some do.
1641 */
1642static inline bool bvec_gap_to_prev(struct request_queue *q,
1643 struct bio_vec *bprv, unsigned int offset)
1644{
1645 if (!queue_virt_boundary(q))
1646 return false;
e0af2917 1647 return __bvec_gap_to_prev(q, bprv, offset);
03100aad
KB
1648}
1649
729204ef
ML
1650/*
1651 * Check if the two bvecs from two bios can be merged to one segment.
1652 * If yes, no need to check gap between the two bios since the 1st bio
1653 * and the 1st bvec in the 2nd bio can be handled in one segment.
1654 */
1655static inline bool bios_segs_mergeable(struct request_queue *q,
1656 struct bio *prev, struct bio_vec *prev_last_bv,
1657 struct bio_vec *next_first_bv)
1658{
1659 if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
1660 return false;
1661 if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
1662 return false;
1663 if (prev->bi_seg_back_size + next_first_bv->bv_len >
1664 queue_max_segment_size(q))
1665 return false;
1666 return true;
1667}
1668
5e7c4274
JA
1669static inline bool bio_will_gap(struct request_queue *q, struct bio *prev,
1670 struct bio *next)
1671{
25e71a99
ML
1672 if (bio_has_data(prev) && queue_virt_boundary(q)) {
1673 struct bio_vec pb, nb;
1674
1675 bio_get_last_bvec(prev, &pb);
1676 bio_get_first_bvec(next, &nb);
5e7c4274 1677
729204ef
ML
1678 if (!bios_segs_mergeable(q, prev, &pb, &nb))
1679 return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
25e71a99
ML
1680 }
1681
1682 return false;
5e7c4274
JA
1683}
1684
1685static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
1686{
1687 return bio_will_gap(req->q, req->biotail, bio);
1688}
1689
1690static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
1691{
1692 return bio_will_gap(req->q, bio, req->bio);
1693}
1694
59c3d45e 1695int kblockd_schedule_work(struct work_struct *work);
ee63cfa7 1696int kblockd_schedule_work_on(int cpu, struct work_struct *work);
59c3d45e 1697int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
8ab14595 1698int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
1da177e4 1699
9195291e 1700#ifdef CONFIG_BLK_CGROUP
28f4197e
JA
1701/*
1702 * This should not be using sched_clock(). A real patch is in progress
1703 * to fix this up, until that is in place we need to disable preemption
1704 * around sched_clock() in this function and set_io_start_time_ns().
1705 */
9195291e
DS
1706static inline void set_start_time_ns(struct request *req)
1707{
28f4197e 1708 preempt_disable();
9195291e 1709 req->start_time_ns = sched_clock();
28f4197e 1710 preempt_enable();
9195291e
DS
1711}
1712
1713static inline void set_io_start_time_ns(struct request *req)
1714{
28f4197e 1715 preempt_disable();
9195291e 1716 req->io_start_time_ns = sched_clock();
28f4197e 1717 preempt_enable();
9195291e 1718}
84c124da
DS
1719
1720static inline uint64_t rq_start_time_ns(struct request *req)
1721{
1722 return req->start_time_ns;
1723}
1724
1725static inline uint64_t rq_io_start_time_ns(struct request *req)
1726{
1727 return req->io_start_time_ns;
1728}
9195291e
DS
1729#else
1730static inline void set_start_time_ns(struct request *req) {}
1731static inline void set_io_start_time_ns(struct request *req) {}
84c124da
DS
1732static inline uint64_t rq_start_time_ns(struct request *req)
1733{
1734 return 0;
1735}
1736static inline uint64_t rq_io_start_time_ns(struct request *req)
1737{
1738 return 0;
1739}
9195291e
DS
1740#endif
1741
1da177e4
LT
1742#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1743 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1744#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1745 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1746
7ba1ba12
MP
1747#if defined(CONFIG_BLK_DEV_INTEGRITY)
1748
8288f496
MP
1749enum blk_integrity_flags {
1750 BLK_INTEGRITY_VERIFY = 1 << 0,
1751 BLK_INTEGRITY_GENERATE = 1 << 1,
3aec2f41 1752 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
aae7df50 1753 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
8288f496 1754};
7ba1ba12 1755
18593088 1756struct blk_integrity_iter {
7ba1ba12
MP
1757 void *prot_buf;
1758 void *data_buf;
3be91c4a 1759 sector_t seed;
7ba1ba12 1760 unsigned int data_size;
3be91c4a 1761 unsigned short interval;
7ba1ba12
MP
1762 const char *disk_name;
1763};
1764
18593088 1765typedef int (integrity_processing_fn) (struct blk_integrity_iter *);
7ba1ba12 1766
0f8087ec
MP
1767struct blk_integrity_profile {
1768 integrity_processing_fn *generate_fn;
1769 integrity_processing_fn *verify_fn;
1770 const char *name;
1771};
7ba1ba12 1772
25520d55 1773extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
7ba1ba12 1774extern void blk_integrity_unregister(struct gendisk *);
ad7fce93 1775extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
13f05c8d
MP
1776extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1777 struct scatterlist *);
1778extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
4eaf99be
MP
1779extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
1780 struct request *);
1781extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
1782 struct bio *);
7ba1ba12 1783
25520d55 1784static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
b04accc4 1785{
ac6fc48c 1786 struct blk_integrity *bi = &disk->queue->integrity;
25520d55
MP
1787
1788 if (!bi->profile)
1789 return NULL;
1790
1791 return bi;
b04accc4
JA
1792}
1793
25520d55
MP
1794static inline
1795struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
b02739b0 1796{
25520d55 1797 return blk_get_integrity(bdev->bd_disk);
b02739b0
MP
1798}
1799
180b2f95 1800static inline bool blk_integrity_rq(struct request *rq)
7ba1ba12 1801{
180b2f95 1802 return rq->cmd_flags & REQ_INTEGRITY;
7ba1ba12
MP
1803}
1804
13f05c8d
MP
1805static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1806 unsigned int segs)
1807{
1808 q->limits.max_integrity_segments = segs;
1809}
1810
1811static inline unsigned short
1812queue_max_integrity_segments(struct request_queue *q)
1813{
1814 return q->limits.max_integrity_segments;
1815}
1816
7f39add3
SG
1817static inline bool integrity_req_gap_back_merge(struct request *req,
1818 struct bio *next)
1819{
1820 struct bio_integrity_payload *bip = bio_integrity(req->bio);
1821 struct bio_integrity_payload *bip_next = bio_integrity(next);
1822
1823 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1824 bip_next->bip_vec[0].bv_offset);
1825}
1826
1827static inline bool integrity_req_gap_front_merge(struct request *req,
1828 struct bio *bio)
1829{
1830 struct bio_integrity_payload *bip = bio_integrity(bio);
1831 struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
1832
1833 return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
1834 bip_next->bip_vec[0].bv_offset);
1835}
1836
7ba1ba12
MP
1837#else /* CONFIG_BLK_DEV_INTEGRITY */
1838
fd83240a
SR
1839struct bio;
1840struct block_device;
1841struct gendisk;
1842struct blk_integrity;
1843
1844static inline int blk_integrity_rq(struct request *rq)
1845{
1846 return 0;
1847}
1848static inline int blk_rq_count_integrity_sg(struct request_queue *q,
1849 struct bio *b)
1850{
1851 return 0;
1852}
1853static inline int blk_rq_map_integrity_sg(struct request_queue *q,
1854 struct bio *b,
1855 struct scatterlist *s)
1856{
1857 return 0;
1858}
1859static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
1860{
61a04e5b 1861 return NULL;
fd83240a
SR
1862}
1863static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1864{
1865 return NULL;
1866}
1867static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
1868{
1869 return 0;
1870}
25520d55 1871static inline void blk_integrity_register(struct gendisk *d,
fd83240a
SR
1872 struct blk_integrity *b)
1873{
fd83240a
SR
1874}
1875static inline void blk_integrity_unregister(struct gendisk *d)
1876{
1877}
1878static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1879 unsigned int segs)
1880{
1881}
1882static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
1883{
1884 return 0;
1885}
4eaf99be
MP
1886static inline bool blk_integrity_merge_rq(struct request_queue *rq,
1887 struct request *r1,
1888 struct request *r2)
fd83240a 1889{
cb1a5ab6 1890 return true;
fd83240a 1891}
4eaf99be
MP
1892static inline bool blk_integrity_merge_bio(struct request_queue *rq,
1893 struct request *r,
1894 struct bio *b)
fd83240a 1895{
cb1a5ab6 1896 return true;
fd83240a 1897}
25520d55 1898
7f39add3
SG
1899static inline bool integrity_req_gap_back_merge(struct request *req,
1900 struct bio *next)
1901{
1902 return false;
1903}
1904static inline bool integrity_req_gap_front_merge(struct request *req,
1905 struct bio *bio)
1906{
1907 return false;
1908}
7ba1ba12
MP
1909
1910#endif /* CONFIG_BLK_DEV_INTEGRITY */
1911
b2e0d162
DW
1912/**
1913 * struct blk_dax_ctl - control and output parameters for ->direct_access
1914 * @sector: (input) offset relative to a block_device
1915 * @addr: (output) kernel virtual address for @sector populated by driver
1916 * @pfn: (output) page frame number for @addr populated by driver
1917 * @size: (input) number of bytes requested
1918 */
1919struct blk_dax_ctl {
1920 sector_t sector;
7a9eb206 1921 void *addr;
b2e0d162 1922 long size;
34c0fd54 1923 pfn_t pfn;
b2e0d162
DW
1924};
1925
08f85851 1926struct block_device_operations {
d4430d62 1927 int (*open) (struct block_device *, fmode_t);
db2a144b 1928 void (*release) (struct gendisk *, fmode_t);
c11f0c0b 1929 int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
d4430d62
AV
1930 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1931 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
7a9eb206
DW
1932 long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *,
1933 long);
77ea887e
TH
1934 unsigned int (*check_events) (struct gendisk *disk,
1935 unsigned int clearing);
1936 /* ->media_changed() is DEPRECATED, use ->check_events() instead */
08f85851 1937 int (*media_changed) (struct gendisk *);
c3e33e04 1938 void (*unlock_native_capacity) (struct gendisk *);
08f85851
AV
1939 int (*revalidate_disk) (struct gendisk *);
1940 int (*getgeo)(struct block_device *, struct hd_geometry *);
b3a27d05
NG
1941 /* this callback is with swap_lock and sometimes page table lock held */
1942 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
08f85851 1943 struct module *owner;
bbd3e064 1944 const struct pr_ops *pr_ops;
08f85851
AV
1945};
1946
633a08b8
AV
1947extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1948 unsigned long);
47a191fd
MW
1949extern int bdev_read_page(struct block_device *, sector_t, struct page *);
1950extern int bdev_write_page(struct block_device *, sector_t, struct page *,
1951 struct writeback_control *);
b2e0d162 1952extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
2d96afc8 1953extern int bdev_dax_supported(struct super_block *, int);
a8078b1f 1954extern bool bdev_dax_capable(struct block_device *);
9361401e 1955#else /* CONFIG_BLOCK */
ac13a829
FF
1956
1957struct block_device;
1958
9361401e
DH
1959/*
1960 * stubs for when the block layer is configured out
1961 */
1962#define buffer_heads_over_limit 0
1963
9361401e
DH
1964static inline long nr_blockdev_pages(void)
1965{
1966 return 0;
1967}
1968
1f940bdf
JA
1969struct blk_plug {
1970};
1971
1972static inline void blk_start_plug(struct blk_plug *plug)
73c10101
JA
1973{
1974}
1975
1f940bdf 1976static inline void blk_finish_plug(struct blk_plug *plug)
73c10101
JA
1977{
1978}
1979
1f940bdf 1980static inline void blk_flush_plug(struct task_struct *task)
73c10101
JA
1981{
1982}
1983
a237c1c5
JA
1984static inline void blk_schedule_flush_plug(struct task_struct *task)
1985{
1986}
1987
1988
73c10101
JA
1989static inline bool blk_needs_flush_plug(struct task_struct *tsk)
1990{
1991 return false;
1992}
1993
ac13a829
FF
1994static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
1995 sector_t *error_sector)
1996{
1997 return 0;
1998}
1999
9361401e
DH
2000#endif /* CONFIG_BLOCK */
2001
1da177e4 2002#endif