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1#ifndef _LINUX_BLKDEV_H
2#define _LINUX_BLKDEV_H
3
4#ifdef CONFIG_BLOCK
5
6#include <linux/sched.h>
7#include <linux/major.h>
8#include <linux/genhd.h>
9#include <linux/list.h>
10#include <linux/timer.h>
11#include <linux/workqueue.h>
12#include <linux/pagemap.h>
13#include <linux/backing-dev.h>
14#include <linux/wait.h>
15#include <linux/mempool.h>
16#include <linux/bio.h>
17#include <linux/module.h>
18#include <linux/stringify.h>
19#include <linux/gfp.h>
20#include <linux/bsg.h>
21#include <linux/smp.h>
22
23#include <asm/scatterlist.h>
24
25struct scsi_ioctl_command;
26
27struct request_queue;
28struct elevator_queue;
29struct request_pm_state;
30struct blk_trace;
31struct request;
32struct sg_io_hdr;
33
34#define BLKDEV_MIN_RQ 4
35#define BLKDEV_MAX_RQ 128 /* Default maximum */
36
37struct request;
38typedef void (rq_end_io_fn)(struct request *, int);
39
40struct request_list {
41 /*
42 * count[], starved[], and wait[] are indexed by
43 * BLK_RW_SYNC/BLK_RW_ASYNC
44 */
45 int count[2];
46 int starved[2];
47 int elvpriv;
48 mempool_t *rq_pool;
49 wait_queue_head_t wait[2];
50};
51
52/*
53 * request command types
54 */
55enum rq_cmd_type_bits {
56 REQ_TYPE_FS = 1, /* fs request */
57 REQ_TYPE_BLOCK_PC, /* scsi command */
58 REQ_TYPE_SENSE, /* sense request */
59 REQ_TYPE_PM_SUSPEND, /* suspend request */
60 REQ_TYPE_PM_RESUME, /* resume request */
61 REQ_TYPE_PM_SHUTDOWN, /* shutdown request */
62 REQ_TYPE_SPECIAL, /* driver defined type */
63 /*
64 * for ATA/ATAPI devices. this really doesn't belong here, ide should
65 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver
66 * private REQ_LB opcodes to differentiate what type of request this is
67 */
68 REQ_TYPE_ATA_TASKFILE,
69 REQ_TYPE_ATA_PC,
70};
71
72#define BLK_MAX_CDB 16
73
74/*
75 * try to put the fields that are referenced together in the same cacheline.
76 * if you modify this structure, be sure to check block/blk-core.c:rq_init()
77 * as well!
78 */
79struct request {
80 struct list_head queuelist;
81 struct call_single_data csd;
82
83 struct request_queue *q;
84
85 unsigned int cmd_flags;
86 enum rq_cmd_type_bits cmd_type;
87 unsigned long atomic_flags;
88
89 int cpu;
90
91 /* the following two fields are internal, NEVER access directly */
92 unsigned int __data_len; /* total data len */
93 sector_t __sector; /* sector cursor */
94
95 struct bio *bio;
96 struct bio *biotail;
97
98 struct hlist_node hash; /* merge hash */
99 /*
100 * The rb_node is only used inside the io scheduler, requests
101 * are pruned when moved to the dispatch queue. So let the
102 * completion_data share space with the rb_node.
103 */
104 union {
105 struct rb_node rb_node; /* sort/lookup */
106 void *completion_data;
107 };
108
109 /*
110 * Three pointers are available for the IO schedulers, if they need
111 * more they have to dynamically allocate it.
112 */
113 void *elevator_private;
114 void *elevator_private2;
115 void *elevator_private3;
116
117 struct gendisk *rq_disk;
118 unsigned long start_time;
119#ifdef CONFIG_BLK_CGROUP
120 unsigned long long start_time_ns;
121 unsigned long long io_start_time_ns; /* when passed to hardware */
122#endif
123 /* Number of scatter-gather DMA addr+len pairs after
124 * physical address coalescing is performed.
125 */
126 unsigned short nr_phys_segments;
127#if defined(CONFIG_BLK_DEV_INTEGRITY)
128 unsigned short nr_integrity_segments;
129#endif
130
131 unsigned short ioprio;
132
133 int ref_count;
134
135 void *special; /* opaque pointer available for LLD use */
136 char *buffer; /* kaddr of the current segment if available */
137
138 int tag;
139 int errors;
140
141 /*
142 * when request is used as a packet command carrier
143 */
144 unsigned char __cmd[BLK_MAX_CDB];
145 unsigned char *cmd;
146 unsigned short cmd_len;
147
148 unsigned int extra_len; /* length of alignment and padding */
149 unsigned int sense_len;
150 unsigned int resid_len; /* residual count */
151 void *sense;
152
153 unsigned long deadline;
154 struct list_head timeout_list;
155 unsigned int timeout;
156 int retries;
157
158 /*
159 * completion callback.
160 */
161 rq_end_io_fn *end_io;
162 void *end_io_data;
163
164 /* for bidi */
165 struct request *next_rq;
166};
167
168static inline unsigned short req_get_ioprio(struct request *req)
169{
170 return req->ioprio;
171}
172
173/*
174 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME
175 * requests. Some step values could eventually be made generic.
176 */
177struct request_pm_state
178{
179 /* PM state machine step value, currently driver specific */
180 int pm_step;
181 /* requested PM state value (S1, S2, S3, S4, ...) */
182 u32 pm_state;
183 void* data; /* for driver use */
184};
185
186#include <linux/elevator.h>
187
188typedef void (request_fn_proc) (struct request_queue *q);
189typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
190typedef int (prep_rq_fn) (struct request_queue *, struct request *);
191typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
192typedef void (unplug_fn) (struct request_queue *);
193
194struct bio_vec;
195struct bvec_merge_data {
196 struct block_device *bi_bdev;
197 sector_t bi_sector;
198 unsigned bi_size;
199 unsigned long bi_rw;
200};
201typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
202 struct bio_vec *);
203typedef void (softirq_done_fn)(struct request *);
204typedef int (dma_drain_needed_fn)(struct request *);
205typedef int (lld_busy_fn) (struct request_queue *q);
206
207enum blk_eh_timer_return {
208 BLK_EH_NOT_HANDLED,
209 BLK_EH_HANDLED,
210 BLK_EH_RESET_TIMER,
211};
212
213typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
214
215enum blk_queue_state {
216 Queue_down,
217 Queue_up,
218};
219
220struct blk_queue_tag {
221 struct request **tag_index; /* map of busy tags */
222 unsigned long *tag_map; /* bit map of free/busy tags */
223 int busy; /* current depth */
224 int max_depth; /* what we will send to device */
225 int real_max_depth; /* what the array can hold */
226 atomic_t refcnt; /* map can be shared */
227};
228
229#define BLK_SCSI_MAX_CMDS (256)
230#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
231
232struct queue_limits {
233 unsigned long bounce_pfn;
234 unsigned long seg_boundary_mask;
235
236 unsigned int max_hw_sectors;
237 unsigned int max_sectors;
238 unsigned int max_segment_size;
239 unsigned int physical_block_size;
240 unsigned int alignment_offset;
241 unsigned int io_min;
242 unsigned int io_opt;
243 unsigned int max_discard_sectors;
244 unsigned int discard_granularity;
245 unsigned int discard_alignment;
246
247 unsigned short logical_block_size;
248 unsigned short max_segments;
249 unsigned short max_integrity_segments;
250
251 unsigned char misaligned;
252 unsigned char discard_misaligned;
253 unsigned char no_cluster;
254 signed char discard_zeroes_data;
255};
256
257struct request_queue
258{
259 /*
260 * Together with queue_head for cacheline sharing
261 */
262 struct list_head queue_head;
263 struct request *last_merge;
264 struct elevator_queue *elevator;
265
266 /*
267 * the queue request freelist, one for reads and one for writes
268 */
269 struct request_list rq;
270
271 request_fn_proc *request_fn;
272 make_request_fn *make_request_fn;
273 prep_rq_fn *prep_rq_fn;
274 unprep_rq_fn *unprep_rq_fn;
275 unplug_fn *unplug_fn;
276 merge_bvec_fn *merge_bvec_fn;
277 softirq_done_fn *softirq_done_fn;
278 rq_timed_out_fn *rq_timed_out_fn;
279 dma_drain_needed_fn *dma_drain_needed;
280 lld_busy_fn *lld_busy_fn;
281
282 /*
283 * Dispatch queue sorting
284 */
285 sector_t end_sector;
286 struct request *boundary_rq;
287
288 /*
289 * Auto-unplugging state
290 */
291 struct timer_list unplug_timer;
292 int unplug_thresh; /* After this many requests */
293 unsigned long unplug_delay; /* After this many jiffies */
294 struct work_struct unplug_work;
295
296 struct backing_dev_info backing_dev_info;
297
298 /*
299 * The queue owner gets to use this for whatever they like.
300 * ll_rw_blk doesn't touch it.
301 */
302 void *queuedata;
303
304 /*
305 * queue needs bounce pages for pages above this limit
306 */
307 gfp_t bounce_gfp;
308
309 /*
310 * various queue flags, see QUEUE_* below
311 */
312 unsigned long queue_flags;
313
314 /*
315 * protects queue structures from reentrancy. ->__queue_lock should
316 * _never_ be used directly, it is queue private. always use
317 * ->queue_lock.
318 */
319 spinlock_t __queue_lock;
320 spinlock_t *queue_lock;
321
322 /*
323 * queue kobject
324 */
325 struct kobject kobj;
326
327 /*
328 * queue settings
329 */
330 unsigned long nr_requests; /* Max # of requests */
331 unsigned int nr_congestion_on;
332 unsigned int nr_congestion_off;
333 unsigned int nr_batching;
334
335 void *dma_drain_buffer;
336 unsigned int dma_drain_size;
337 unsigned int dma_pad_mask;
338 unsigned int dma_alignment;
339
340 struct blk_queue_tag *queue_tags;
341 struct list_head tag_busy_list;
342
343 unsigned int nr_sorted;
344 unsigned int in_flight[2];
345
346 unsigned int rq_timeout;
347 struct timer_list timeout;
348 struct list_head timeout_list;
349
350 struct queue_limits limits;
351
352 /*
353 * sg stuff
354 */
355 unsigned int sg_timeout;
356 unsigned int sg_reserved_size;
357 int node;
358#ifdef CONFIG_BLK_DEV_IO_TRACE
359 struct blk_trace *blk_trace;
360#endif
361 /*
362 * for flush operations
363 */
364 unsigned int flush_flags;
365 unsigned int flush_seq;
366 int flush_err;
367 struct request flush_rq;
368 struct request *orig_flush_rq;
369 struct list_head pending_flushes;
370
371 struct mutex sysfs_lock;
372
373#if defined(CONFIG_BLK_DEV_BSG)
374 struct bsg_class_device bsg_dev;
375#endif
376
377#ifdef CONFIG_BLK_DEV_THROTTLING
378 /* Throttle data */
379 struct throtl_data *td;
380#endif
381};
382
383#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
384#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
385#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
386#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
387#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
388#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
389#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
390#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */
391#define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */
392#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
393#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
394#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
395#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
396#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
397#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
398#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
399#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */
400#define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */
401#define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */
402#define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */
403#define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */
404
405#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
406 (1 << QUEUE_FLAG_CLUSTER) | \
407 (1 << QUEUE_FLAG_STACKABLE) | \
408 (1 << QUEUE_FLAG_SAME_COMP) | \
409 (1 << QUEUE_FLAG_ADD_RANDOM))
410
411static inline int queue_is_locked(struct request_queue *q)
412{
413#ifdef CONFIG_SMP
414 spinlock_t *lock = q->queue_lock;
415 return lock && spin_is_locked(lock);
416#else
417 return 1;
418#endif
419}
420
421static inline void queue_flag_set_unlocked(unsigned int flag,
422 struct request_queue *q)
423{
424 __set_bit(flag, &q->queue_flags);
425}
426
427static inline int queue_flag_test_and_clear(unsigned int flag,
428 struct request_queue *q)
429{
430 WARN_ON_ONCE(!queue_is_locked(q));
431
432 if (test_bit(flag, &q->queue_flags)) {
433 __clear_bit(flag, &q->queue_flags);
434 return 1;
435 }
436
437 return 0;
438}
439
440static inline int queue_flag_test_and_set(unsigned int flag,
441 struct request_queue *q)
442{
443 WARN_ON_ONCE(!queue_is_locked(q));
444
445 if (!test_bit(flag, &q->queue_flags)) {
446 __set_bit(flag, &q->queue_flags);
447 return 0;
448 }
449
450 return 1;
451}
452
453static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
454{
455 WARN_ON_ONCE(!queue_is_locked(q));
456 __set_bit(flag, &q->queue_flags);
457}
458
459static inline void queue_flag_clear_unlocked(unsigned int flag,
460 struct request_queue *q)
461{
462 __clear_bit(flag, &q->queue_flags);
463}
464
465static inline int queue_in_flight(struct request_queue *q)
466{
467 return q->in_flight[0] + q->in_flight[1];
468}
469
470static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
471{
472 WARN_ON_ONCE(!queue_is_locked(q));
473 __clear_bit(flag, &q->queue_flags);
474}
475
476#define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
477#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
478#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
479#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
480#define blk_queue_noxmerges(q) \
481 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
482#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
483#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
484#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
485#define blk_queue_stackable(q) \
486 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
487#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
488#define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
489 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
490
491#define blk_noretry_request(rq) \
492 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
493 REQ_FAILFAST_DRIVER))
494
495#define blk_account_rq(rq) \
496 (((rq)->cmd_flags & REQ_STARTED) && \
497 ((rq)->cmd_type == REQ_TYPE_FS || \
498 ((rq)->cmd_flags & REQ_DISCARD)))
499
500#define blk_pm_request(rq) \
501 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \
502 (rq)->cmd_type == REQ_TYPE_PM_RESUME)
503
504#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
505#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
506/* rq->queuelist of dequeued request must be list_empty() */
507#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
508
509#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
510
511#define rq_data_dir(rq) ((rq)->cmd_flags & 1)
512
513/*
514 * We regard a request as sync, if either a read or a sync write
515 */
516static inline bool rw_is_sync(unsigned int rw_flags)
517{
518 return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
519}
520
521static inline bool rq_is_sync(struct request *rq)
522{
523 return rw_is_sync(rq->cmd_flags);
524}
525
526static inline int blk_queue_full(struct request_queue *q, int sync)
527{
528 if (sync)
529 return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags);
530 return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags);
531}
532
533static inline void blk_set_queue_full(struct request_queue *q, int sync)
534{
535 if (sync)
536 queue_flag_set(QUEUE_FLAG_SYNCFULL, q);
537 else
538 queue_flag_set(QUEUE_FLAG_ASYNCFULL, q);
539}
540
541static inline void blk_clear_queue_full(struct request_queue *q, int sync)
542{
543 if (sync)
544 queue_flag_clear(QUEUE_FLAG_SYNCFULL, q);
545 else
546 queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q);
547}
548
549
550/*
551 * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may
552 * it already be started by driver.
553 */
554#define RQ_NOMERGE_FLAGS \
555 (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER | \
556 REQ_FLUSH | REQ_FUA)
557#define rq_mergeable(rq) \
558 (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
559 (((rq)->cmd_flags & REQ_DISCARD) || \
560 (rq)->cmd_type == REQ_TYPE_FS))
561
562/*
563 * q->prep_rq_fn return values
564 */
565#define BLKPREP_OK 0 /* serve it */
566#define BLKPREP_KILL 1 /* fatal error, kill */
567#define BLKPREP_DEFER 2 /* leave on queue */
568
569extern unsigned long blk_max_low_pfn, blk_max_pfn;
570
571/*
572 * standard bounce addresses:
573 *
574 * BLK_BOUNCE_HIGH : bounce all highmem pages
575 * BLK_BOUNCE_ANY : don't bounce anything
576 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary
577 */
578
579#if BITS_PER_LONG == 32
580#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
581#else
582#define BLK_BOUNCE_HIGH -1ULL
583#endif
584#define BLK_BOUNCE_ANY (-1ULL)
585#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
586
587/*
588 * default timeout for SG_IO if none specified
589 */
590#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
591#define BLK_MIN_SG_TIMEOUT (7 * HZ)
592
593#ifdef CONFIG_BOUNCE
594extern int init_emergency_isa_pool(void);
595extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
596#else
597static inline int init_emergency_isa_pool(void)
598{
599 return 0;
600}
601static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
602{
603}
604#endif /* CONFIG_MMU */
605
606struct rq_map_data {
607 struct page **pages;
608 int page_order;
609 int nr_entries;
610 unsigned long offset;
611 int null_mapped;
612 int from_user;
613};
614
615struct req_iterator {
616 int i;
617 struct bio *bio;
618};
619
620/* This should not be used directly - use rq_for_each_segment */
621#define for_each_bio(_bio) \
622 for (; _bio; _bio = _bio->bi_next)
623#define __rq_for_each_bio(_bio, rq) \
624 if ((rq->bio)) \
625 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
626
627#define rq_for_each_segment(bvl, _rq, _iter) \
628 __rq_for_each_bio(_iter.bio, _rq) \
629 bio_for_each_segment(bvl, _iter.bio, _iter.i)
630
631#define rq_iter_last(rq, _iter) \
632 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1)
633
634#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
635# error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
636#endif
637#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
638extern void rq_flush_dcache_pages(struct request *rq);
639#else
640static inline void rq_flush_dcache_pages(struct request *rq)
641{
642}
643#endif
644
645extern int blk_register_queue(struct gendisk *disk);
646extern void blk_unregister_queue(struct gendisk *disk);
647extern void register_disk(struct gendisk *dev);
648extern void generic_make_request(struct bio *bio);
649extern void blk_rq_init(struct request_queue *q, struct request *rq);
650extern void blk_put_request(struct request *);
651extern void __blk_put_request(struct request_queue *, struct request *);
652extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
653extern struct request *blk_make_request(struct request_queue *, struct bio *,
654 gfp_t);
655extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
656extern void blk_requeue_request(struct request_queue *, struct request *);
657extern void blk_add_request_payload(struct request *rq, struct page *page,
658 unsigned int len);
659extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
660extern int blk_lld_busy(struct request_queue *q);
661extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
662 struct bio_set *bs, gfp_t gfp_mask,
663 int (*bio_ctr)(struct bio *, struct bio *, void *),
664 void *data);
665extern void blk_rq_unprep_clone(struct request *rq);
666extern int blk_insert_cloned_request(struct request_queue *q,
667 struct request *rq);
668extern void blk_plug_device(struct request_queue *);
669extern void blk_plug_device_unlocked(struct request_queue *);
670extern int blk_remove_plug(struct request_queue *);
671extern void blk_recount_segments(struct request_queue *, struct bio *);
672extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
673 unsigned int, void __user *);
674extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
675 struct scsi_ioctl_command __user *);
676
677/*
678 * A queue has just exitted congestion. Note this in the global counter of
679 * congested queues, and wake up anyone who was waiting for requests to be
680 * put back.
681 */
682static inline void blk_clear_queue_congested(struct request_queue *q, int sync)
683{
684 clear_bdi_congested(&q->backing_dev_info, sync);
685}
686
687/*
688 * A queue has just entered congestion. Flag that in the queue's VM-visible
689 * state flags and increment the global gounter of congested queues.
690 */
691static inline void blk_set_queue_congested(struct request_queue *q, int sync)
692{
693 set_bdi_congested(&q->backing_dev_info, sync);
694}
695
696extern void blk_start_queue(struct request_queue *q);
697extern void blk_stop_queue(struct request_queue *q);
698extern void blk_sync_queue(struct request_queue *q);
699extern void __blk_stop_queue(struct request_queue *q);
700extern void __blk_run_queue(struct request_queue *);
701extern void blk_run_queue(struct request_queue *);
702extern int blk_rq_map_user(struct request_queue *, struct request *,
703 struct rq_map_data *, void __user *, unsigned long,
704 gfp_t);
705extern int blk_rq_unmap_user(struct bio *);
706extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
707extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
708 struct rq_map_data *, struct sg_iovec *, int,
709 unsigned int, gfp_t);
710extern int blk_execute_rq(struct request_queue *, struct gendisk *,
711 struct request *, int);
712extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
713 struct request *, int, rq_end_io_fn *);
714extern void blk_unplug(struct request_queue *q);
715
716static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
717{
718 return bdev->bd_disk->queue;
719}
720
721/*
722 * blk_rq_pos() : the current sector
723 * blk_rq_bytes() : bytes left in the entire request
724 * blk_rq_cur_bytes() : bytes left in the current segment
725 * blk_rq_err_bytes() : bytes left till the next error boundary
726 * blk_rq_sectors() : sectors left in the entire request
727 * blk_rq_cur_sectors() : sectors left in the current segment
728 */
729static inline sector_t blk_rq_pos(const struct request *rq)
730{
731 return rq->__sector;
732}
733
734static inline unsigned int blk_rq_bytes(const struct request *rq)
735{
736 return rq->__data_len;
737}
738
739static inline int blk_rq_cur_bytes(const struct request *rq)
740{
741 return rq->bio ? bio_cur_bytes(rq->bio) : 0;
742}
743
744extern unsigned int blk_rq_err_bytes(const struct request *rq);
745
746static inline unsigned int blk_rq_sectors(const struct request *rq)
747{
748 return blk_rq_bytes(rq) >> 9;
749}
750
751static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
752{
753 return blk_rq_cur_bytes(rq) >> 9;
754}
755
756/*
757 * Request issue related functions.
758 */
759extern struct request *blk_peek_request(struct request_queue *q);
760extern void blk_start_request(struct request *rq);
761extern struct request *blk_fetch_request(struct request_queue *q);
762
763/*
764 * Request completion related functions.
765 *
766 * blk_update_request() completes given number of bytes and updates
767 * the request without completing it.
768 *
769 * blk_end_request() and friends. __blk_end_request() must be called
770 * with the request queue spinlock acquired.
771 *
772 * Several drivers define their own end_request and call
773 * blk_end_request() for parts of the original function.
774 * This prevents code duplication in drivers.
775 */
776extern bool blk_update_request(struct request *rq, int error,
777 unsigned int nr_bytes);
778extern bool blk_end_request(struct request *rq, int error,
779 unsigned int nr_bytes);
780extern void blk_end_request_all(struct request *rq, int error);
781extern bool blk_end_request_cur(struct request *rq, int error);
782extern bool blk_end_request_err(struct request *rq, int error);
783extern bool __blk_end_request(struct request *rq, int error,
784 unsigned int nr_bytes);
785extern void __blk_end_request_all(struct request *rq, int error);
786extern bool __blk_end_request_cur(struct request *rq, int error);
787extern bool __blk_end_request_err(struct request *rq, int error);
788
789extern void blk_complete_request(struct request *);
790extern void __blk_complete_request(struct request *);
791extern void blk_abort_request(struct request *);
792extern void blk_abort_queue(struct request_queue *);
793extern void blk_unprep_request(struct request *);
794
795/*
796 * Access functions for manipulating queue properties
797 */
798extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
799 spinlock_t *lock, int node_id);
800extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *,
801 request_fn_proc *,
802 spinlock_t *, int node_id);
803extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
804extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
805 request_fn_proc *, spinlock_t *);
806extern void blk_cleanup_queue(struct request_queue *);
807extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
808extern void blk_queue_bounce_limit(struct request_queue *, u64);
809extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
810extern void blk_queue_max_segments(struct request_queue *, unsigned short);
811extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
812extern void blk_queue_max_discard_sectors(struct request_queue *q,
813 unsigned int max_discard_sectors);
814extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
815extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
816extern void blk_queue_alignment_offset(struct request_queue *q,
817 unsigned int alignment);
818extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
819extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
820extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
821extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
822extern void blk_set_default_limits(struct queue_limits *lim);
823extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
824 sector_t offset);
825extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
826 sector_t offset);
827extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
828 sector_t offset);
829extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
830extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
831extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
832extern int blk_queue_dma_drain(struct request_queue *q,
833 dma_drain_needed_fn *dma_drain_needed,
834 void *buf, unsigned int size);
835extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
836extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
837extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
838extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
839extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
840extern void blk_queue_dma_alignment(struct request_queue *, int);
841extern void blk_queue_update_dma_alignment(struct request_queue *, int);
842extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
843extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
844extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
845extern void blk_queue_flush(struct request_queue *q, unsigned int flush);
846extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
847
848extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
849extern void blk_dump_rq_flags(struct request *, char *);
850extern void generic_unplug_device(struct request_queue *);
851extern long nr_blockdev_pages(void);
852
853int blk_get_queue(struct request_queue *);
854struct request_queue *blk_alloc_queue(gfp_t);
855struct request_queue *blk_alloc_queue_node(gfp_t, int);
856extern void blk_put_queue(struct request_queue *);
857
858/*
859 * tag stuff
860 */
861#define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
862extern int blk_queue_start_tag(struct request_queue *, struct request *);
863extern struct request *blk_queue_find_tag(struct request_queue *, int);
864extern void blk_queue_end_tag(struct request_queue *, struct request *);
865extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *);
866extern void blk_queue_free_tags(struct request_queue *);
867extern int blk_queue_resize_tags(struct request_queue *, int);
868extern void blk_queue_invalidate_tags(struct request_queue *);
869extern struct blk_queue_tag *blk_init_tags(int);
870extern void blk_free_tags(struct blk_queue_tag *);
871
872static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
873 int tag)
874{
875 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
876 return NULL;
877 return bqt->tag_index[tag];
878}
879
880#define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */
881
882extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
883extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
884 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
885extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
886 sector_t nr_sects, gfp_t gfp_mask);
887static inline int sb_issue_discard(struct super_block *sb, sector_t block,
888 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
889{
890 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
891 nr_blocks << (sb->s_blocksize_bits - 9),
892 gfp_mask, flags);
893}
894
895extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
896
897enum blk_default_limits {
898 BLK_MAX_SEGMENTS = 128,
899 BLK_SAFE_MAX_SECTORS = 255,
900 BLK_DEF_MAX_SECTORS = 1024,
901 BLK_MAX_SEGMENT_SIZE = 65536,
902 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
903};
904
905#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
906
907static inline unsigned long queue_bounce_pfn(struct request_queue *q)
908{
909 return q->limits.bounce_pfn;
910}
911
912static inline unsigned long queue_segment_boundary(struct request_queue *q)
913{
914 return q->limits.seg_boundary_mask;
915}
916
917static inline unsigned int queue_max_sectors(struct request_queue *q)
918{
919 return q->limits.max_sectors;
920}
921
922static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
923{
924 return q->limits.max_hw_sectors;
925}
926
927static inline unsigned short queue_max_segments(struct request_queue *q)
928{
929 return q->limits.max_segments;
930}
931
932static inline unsigned int queue_max_segment_size(struct request_queue *q)
933{
934 return q->limits.max_segment_size;
935}
936
937static inline unsigned short queue_logical_block_size(struct request_queue *q)
938{
939 int retval = 512;
940
941 if (q && q->limits.logical_block_size)
942 retval = q->limits.logical_block_size;
943
944 return retval;
945}
946
947static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
948{
949 return queue_logical_block_size(bdev_get_queue(bdev));
950}
951
952static inline unsigned int queue_physical_block_size(struct request_queue *q)
953{
954 return q->limits.physical_block_size;
955}
956
957static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
958{
959 return queue_physical_block_size(bdev_get_queue(bdev));
960}
961
962static inline unsigned int queue_io_min(struct request_queue *q)
963{
964 return q->limits.io_min;
965}
966
967static inline int bdev_io_min(struct block_device *bdev)
968{
969 return queue_io_min(bdev_get_queue(bdev));
970}
971
972static inline unsigned int queue_io_opt(struct request_queue *q)
973{
974 return q->limits.io_opt;
975}
976
977static inline int bdev_io_opt(struct block_device *bdev)
978{
979 return queue_io_opt(bdev_get_queue(bdev));
980}
981
982static inline int queue_alignment_offset(struct request_queue *q)
983{
984 if (q->limits.misaligned)
985 return -1;
986
987 return q->limits.alignment_offset;
988}
989
990static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
991{
992 unsigned int granularity = max(lim->physical_block_size, lim->io_min);
993 unsigned int alignment = (sector << 9) & (granularity - 1);
994
995 return (granularity + lim->alignment_offset - alignment)
996 & (granularity - 1);
997}
998
999static inline int bdev_alignment_offset(struct block_device *bdev)
1000{
1001 struct request_queue *q = bdev_get_queue(bdev);
1002
1003 if (q->limits.misaligned)
1004 return -1;
1005
1006 if (bdev != bdev->bd_contains)
1007 return bdev->bd_part->alignment_offset;
1008
1009 return q->limits.alignment_offset;
1010}
1011
1012static inline int queue_discard_alignment(struct request_queue *q)
1013{
1014 if (q->limits.discard_misaligned)
1015 return -1;
1016
1017 return q->limits.discard_alignment;
1018}
1019
1020static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1021{
1022 unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
1023
1024 return (lim->discard_granularity + lim->discard_alignment - alignment)
1025 & (lim->discard_granularity - 1);
1026}
1027
1028static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
1029{
1030 if (q->limits.discard_zeroes_data == 1)
1031 return 1;
1032
1033 return 0;
1034}
1035
1036static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
1037{
1038 return queue_discard_zeroes_data(bdev_get_queue(bdev));
1039}
1040
1041static inline int queue_dma_alignment(struct request_queue *q)
1042{
1043 return q ? q->dma_alignment : 511;
1044}
1045
1046static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1047 unsigned int len)
1048{
1049 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1050 return !(addr & alignment) && !(len & alignment);
1051}
1052
1053/* assumes size > 256 */
1054static inline unsigned int blksize_bits(unsigned int size)
1055{
1056 unsigned int bits = 8;
1057 do {
1058 bits++;
1059 size >>= 1;
1060 } while (size > 256);
1061 return bits;
1062}
1063
1064static inline unsigned int block_size(struct block_device *bdev)
1065{
1066 return bdev->bd_block_size;
1067}
1068
1069typedef struct {struct page *v;} Sector;
1070
1071unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);
1072
1073static inline void put_dev_sector(Sector p)
1074{
1075 page_cache_release(p.v);
1076}
1077
1078struct work_struct;
1079int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
1080int kblockd_schedule_delayed_work(struct request_queue *q, struct delayed_work *dwork, unsigned long delay);
1081
1082#ifdef CONFIG_BLK_CGROUP
1083/*
1084 * This should not be using sched_clock(). A real patch is in progress
1085 * to fix this up, until that is in place we need to disable preemption
1086 * around sched_clock() in this function and set_io_start_time_ns().
1087 */
1088static inline void set_start_time_ns(struct request *req)
1089{
1090 preempt_disable();
1091 req->start_time_ns = sched_clock();
1092 preempt_enable();
1093}
1094
1095static inline void set_io_start_time_ns(struct request *req)
1096{
1097 preempt_disable();
1098 req->io_start_time_ns = sched_clock();
1099 preempt_enable();
1100}
1101
1102static inline uint64_t rq_start_time_ns(struct request *req)
1103{
1104 return req->start_time_ns;
1105}
1106
1107static inline uint64_t rq_io_start_time_ns(struct request *req)
1108{
1109 return req->io_start_time_ns;
1110}
1111#else
1112static inline void set_start_time_ns(struct request *req) {}
1113static inline void set_io_start_time_ns(struct request *req) {}
1114static inline uint64_t rq_start_time_ns(struct request *req)
1115{
1116 return 0;
1117}
1118static inline uint64_t rq_io_start_time_ns(struct request *req)
1119{
1120 return 0;
1121}
1122#endif
1123
1124#ifdef CONFIG_BLK_DEV_THROTTLING
1125extern int blk_throtl_init(struct request_queue *q);
1126extern void blk_throtl_exit(struct request_queue *q);
1127extern int blk_throtl_bio(struct request_queue *q, struct bio **bio);
1128extern void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay);
1129extern void throtl_shutdown_timer_wq(struct request_queue *q);
1130#else /* CONFIG_BLK_DEV_THROTTLING */
1131static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio)
1132{
1133 return 0;
1134}
1135
1136static inline int blk_throtl_init(struct request_queue *q) { return 0; }
1137static inline int blk_throtl_exit(struct request_queue *q) { return 0; }
1138static inline void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay) {}
1139static inline void throtl_shutdown_timer_wq(struct request_queue *q) {}
1140#endif /* CONFIG_BLK_DEV_THROTTLING */
1141
1142#define MODULE_ALIAS_BLOCKDEV(major,minor) \
1143 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
1144#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
1145 MODULE_ALIAS("block-major-" __stringify(major) "-*")
1146
1147#if defined(CONFIG_BLK_DEV_INTEGRITY)
1148
1149#define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */
1150#define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */
1151
1152struct blk_integrity_exchg {
1153 void *prot_buf;
1154 void *data_buf;
1155 sector_t sector;
1156 unsigned int data_size;
1157 unsigned short sector_size;
1158 const char *disk_name;
1159};
1160
1161typedef void (integrity_gen_fn) (struct blk_integrity_exchg *);
1162typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *);
1163typedef void (integrity_set_tag_fn) (void *, void *, unsigned int);
1164typedef void (integrity_get_tag_fn) (void *, void *, unsigned int);
1165
1166struct blk_integrity {
1167 integrity_gen_fn *generate_fn;
1168 integrity_vrfy_fn *verify_fn;
1169 integrity_set_tag_fn *set_tag_fn;
1170 integrity_get_tag_fn *get_tag_fn;
1171
1172 unsigned short flags;
1173 unsigned short tuple_size;
1174 unsigned short sector_size;
1175 unsigned short tag_size;
1176
1177 const char *name;
1178
1179 struct kobject kobj;
1180};
1181
1182extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
1183extern void blk_integrity_unregister(struct gendisk *);
1184extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1185extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
1186 struct scatterlist *);
1187extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1188extern int blk_integrity_merge_rq(struct request_queue *, struct request *,
1189 struct request *);
1190extern int blk_integrity_merge_bio(struct request_queue *, struct request *,
1191 struct bio *);
1192
1193static inline
1194struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1195{
1196 return bdev->bd_disk->integrity;
1197}
1198
1199static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1200{
1201 return disk->integrity;
1202}
1203
1204static inline int blk_integrity_rq(struct request *rq)
1205{
1206 if (rq->bio == NULL)
1207 return 0;
1208
1209 return bio_integrity(rq->bio);
1210}
1211
1212static inline void blk_queue_max_integrity_segments(struct request_queue *q,
1213 unsigned int segs)
1214{
1215 q->limits.max_integrity_segments = segs;
1216}
1217
1218static inline unsigned short
1219queue_max_integrity_segments(struct request_queue *q)
1220{
1221 return q->limits.max_integrity_segments;
1222}
1223
1224#else /* CONFIG_BLK_DEV_INTEGRITY */
1225
1226#define blk_integrity_rq(rq) (0)
1227#define blk_rq_count_integrity_sg(a, b) (0)
1228#define blk_rq_map_integrity_sg(a, b, c) (0)
1229#define bdev_get_integrity(a) (0)
1230#define blk_get_integrity(a) (0)
1231#define blk_integrity_compare(a, b) (0)
1232#define blk_integrity_register(a, b) (0)
1233#define blk_integrity_unregister(a) do { } while (0);
1234#define blk_queue_max_integrity_segments(a, b) do { } while (0);
1235#define queue_max_integrity_segments(a) (0)
1236#define blk_integrity_merge_rq(a, b, c) (0)
1237#define blk_integrity_merge_bio(a, b, c) (0)
1238
1239#endif /* CONFIG_BLK_DEV_INTEGRITY */
1240
1241struct block_device_operations {
1242 int (*open) (struct block_device *, fmode_t);
1243 int (*release) (struct gendisk *, fmode_t);
1244 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1245 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1246 int (*direct_access) (struct block_device *, sector_t,
1247 void **, unsigned long *);
1248 int (*media_changed) (struct gendisk *);
1249 void (*unlock_native_capacity) (struct gendisk *);
1250 int (*revalidate_disk) (struct gendisk *);
1251 int (*getgeo)(struct block_device *, struct hd_geometry *);
1252 /* this callback is with swap_lock and sometimes page table lock held */
1253 void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1254 struct module *owner;
1255};
1256
1257extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
1258 unsigned long);
1259#else /* CONFIG_BLOCK */
1260/*
1261 * stubs for when the block layer is configured out
1262 */
1263#define buffer_heads_over_limit 0
1264
1265static inline long nr_blockdev_pages(void)
1266{
1267 return 0;
1268}
1269
1270#endif /* CONFIG_BLOCK */
1271
1272#endif
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