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1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H |
3 | |
4 | #include <linux/sched.h> |
5 | |
6 | #ifdef CONFIG_BLOCK |
7 | |
8 | #include <linux/major.h> |
9 | #include <linux/genhd.h> |
10 | #include <linux/list.h> |
11 | #include <linux/timer.h> |
12 | #include <linux/workqueue.h> |
13 | #include <linux/pagemap.h> |
14 | #include <linux/backing-dev.h> |
15 | #include <linux/wait.h> |
16 | #include <linux/mempool.h> |
17 | #include <linux/bio.h> |
18 | #include <linux/stringify.h> |
19 | #include <linux/gfp.h> |
20 | #include <linux/bsg.h> |
21 | #include <linux/smp.h> |
22 | #include <linux/rcupdate.h> |
23 | |
24 | #include <asm/scatterlist.h> |
25 | |
26 | struct module; |
27 | struct scsi_ioctl_command; |
28 | |
29 | struct request_queue; |
30 | struct elevator_queue; |
31 | struct request_pm_state; |
32 | struct blk_trace; |
33 | struct request; |
34 | struct sg_io_hdr; |
35 | struct bsg_job; |
36 | struct blkcg_gq; |
37 | |
38 | #define BLKDEV_MIN_RQ 4 |
39 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
40 | |
41 | /* |
42 | * Maximum number of blkcg policies allowed to be registered concurrently. |
43 | * Defined here to simplify include dependency. |
44 | */ |
45 | #define BLKCG_MAX_POLS 2 |
46 | |
47 | struct request; |
48 | typedef void (rq_end_io_fn)(struct request *, int); |
49 | |
50 | #define BLK_RL_SYNCFULL (1U << 0) |
51 | #define BLK_RL_ASYNCFULL (1U << 1) |
52 | |
53 | struct request_list { |
54 | struct request_queue *q; /* the queue this rl belongs to */ |
55 | #ifdef CONFIG_BLK_CGROUP |
56 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
57 | #endif |
58 | /* |
59 | * count[], starved[], and wait[] are indexed by |
60 | * BLK_RW_SYNC/BLK_RW_ASYNC |
61 | */ |
62 | int count[2]; |
63 | int starved[2]; |
64 | mempool_t *rq_pool; |
65 | wait_queue_head_t wait[2]; |
66 | unsigned int flags; |
67 | }; |
68 | |
69 | /* |
70 | * request command types |
71 | */ |
72 | enum rq_cmd_type_bits { |
73 | REQ_TYPE_FS = 1, /* fs request */ |
74 | REQ_TYPE_BLOCK_PC, /* scsi command */ |
75 | REQ_TYPE_SENSE, /* sense request */ |
76 | REQ_TYPE_PM_SUSPEND, /* suspend request */ |
77 | REQ_TYPE_PM_RESUME, /* resume request */ |
78 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
79 | REQ_TYPE_SPECIAL, /* driver defined type */ |
80 | /* |
81 | * for ATA/ATAPI devices. this really doesn't belong here, ide should |
82 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
83 | * private REQ_LB opcodes to differentiate what type of request this is |
84 | */ |
85 | REQ_TYPE_ATA_TASKFILE, |
86 | REQ_TYPE_ATA_PC, |
87 | }; |
88 | |
89 | #define BLK_MAX_CDB 16 |
90 | |
91 | /* |
92 | * try to put the fields that are referenced together in the same cacheline. |
93 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
94 | * as well! |
95 | */ |
96 | struct request { |
97 | struct list_head queuelist; |
98 | struct call_single_data csd; |
99 | |
100 | struct request_queue *q; |
101 | |
102 | unsigned int cmd_flags; |
103 | enum rq_cmd_type_bits cmd_type; |
104 | unsigned long atomic_flags; |
105 | |
106 | int cpu; |
107 | |
108 | /* the following two fields are internal, NEVER access directly */ |
109 | unsigned int __data_len; /* total data len */ |
110 | sector_t __sector; /* sector cursor */ |
111 | |
112 | struct bio *bio; |
113 | struct bio *biotail; |
114 | |
115 | struct hlist_node hash; /* merge hash */ |
116 | /* |
117 | * The rb_node is only used inside the io scheduler, requests |
118 | * are pruned when moved to the dispatch queue. So let the |
119 | * completion_data share space with the rb_node. |
120 | */ |
121 | union { |
122 | struct rb_node rb_node; /* sort/lookup */ |
123 | void *completion_data; |
124 | }; |
125 | |
126 | /* |
127 | * Three pointers are available for the IO schedulers, if they need |
128 | * more they have to dynamically allocate it. Flush requests are |
129 | * never put on the IO scheduler. So let the flush fields share |
130 | * space with the elevator data. |
131 | */ |
132 | union { |
133 | struct { |
134 | struct io_cq *icq; |
135 | void *priv[2]; |
136 | } elv; |
137 | |
138 | struct { |
139 | unsigned int seq; |
140 | struct list_head list; |
141 | rq_end_io_fn *saved_end_io; |
142 | } flush; |
143 | }; |
144 | |
145 | struct gendisk *rq_disk; |
146 | struct hd_struct *part; |
147 | unsigned long start_time; |
148 | #ifdef CONFIG_BLK_CGROUP |
149 | struct request_list *rl; /* rl this rq is alloced from */ |
150 | unsigned long long start_time_ns; |
151 | unsigned long long io_start_time_ns; /* when passed to hardware */ |
152 | #endif |
153 | /* Number of scatter-gather DMA addr+len pairs after |
154 | * physical address coalescing is performed. |
155 | */ |
156 | unsigned short nr_phys_segments; |
157 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
158 | unsigned short nr_integrity_segments; |
159 | #endif |
160 | |
161 | unsigned short ioprio; |
162 | |
163 | int ref_count; |
164 | |
165 | void *special; /* opaque pointer available for LLD use */ |
166 | char *buffer; /* kaddr of the current segment if available */ |
167 | |
168 | int tag; |
169 | int errors; |
170 | |
171 | /* |
172 | * when request is used as a packet command carrier |
173 | */ |
174 | unsigned char __cmd[BLK_MAX_CDB]; |
175 | unsigned char *cmd; |
176 | unsigned short cmd_len; |
177 | |
178 | unsigned int extra_len; /* length of alignment and padding */ |
179 | unsigned int sense_len; |
180 | unsigned int resid_len; /* residual count */ |
181 | void *sense; |
182 | |
183 | unsigned long deadline; |
184 | struct list_head timeout_list; |
185 | unsigned int timeout; |
186 | int retries; |
187 | |
188 | /* |
189 | * completion callback. |
190 | */ |
191 | rq_end_io_fn *end_io; |
192 | void *end_io_data; |
193 | |
194 | /* for bidi */ |
195 | struct request *next_rq; |
196 | }; |
197 | |
198 | static inline unsigned short req_get_ioprio(struct request *req) |
199 | { |
200 | return req->ioprio; |
201 | } |
202 | |
203 | /* |
204 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
205 | * requests. Some step values could eventually be made generic. |
206 | */ |
207 | struct request_pm_state |
208 | { |
209 | /* PM state machine step value, currently driver specific */ |
210 | int pm_step; |
211 | /* requested PM state value (S1, S2, S3, S4, ...) */ |
212 | u32 pm_state; |
213 | void* data; /* for driver use */ |
214 | }; |
215 | |
216 | #include <linux/elevator.h> |
217 | |
218 | typedef void (request_fn_proc) (struct request_queue *q); |
219 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
220 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
221 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
222 | |
223 | struct bio_vec; |
224 | struct bvec_merge_data { |
225 | struct block_device *bi_bdev; |
226 | sector_t bi_sector; |
227 | unsigned bi_size; |
228 | unsigned long bi_rw; |
229 | }; |
230 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
231 | struct bio_vec *); |
232 | typedef void (softirq_done_fn)(struct request *); |
233 | typedef int (dma_drain_needed_fn)(struct request *); |
234 | typedef int (lld_busy_fn) (struct request_queue *q); |
235 | typedef int (bsg_job_fn) (struct bsg_job *); |
236 | |
237 | enum blk_eh_timer_return { |
238 | BLK_EH_NOT_HANDLED, |
239 | BLK_EH_HANDLED, |
240 | BLK_EH_RESET_TIMER, |
241 | }; |
242 | |
243 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
244 | |
245 | enum blk_queue_state { |
246 | Queue_down, |
247 | Queue_up, |
248 | }; |
249 | |
250 | struct blk_queue_tag { |
251 | struct request **tag_index; /* map of busy tags */ |
252 | unsigned long *tag_map; /* bit map of free/busy tags */ |
253 | int busy; /* current depth */ |
254 | int max_depth; /* what we will send to device */ |
255 | int real_max_depth; /* what the array can hold */ |
256 | atomic_t refcnt; /* map can be shared */ |
257 | }; |
258 | |
259 | #define BLK_SCSI_MAX_CMDS (256) |
260 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
261 | |
262 | struct queue_limits { |
263 | unsigned long bounce_pfn; |
264 | unsigned long seg_boundary_mask; |
265 | |
266 | unsigned int max_hw_sectors; |
267 | unsigned int max_sectors; |
268 | unsigned int max_segment_size; |
269 | unsigned int physical_block_size; |
270 | unsigned int alignment_offset; |
271 | unsigned int io_min; |
272 | unsigned int io_opt; |
273 | unsigned int max_discard_sectors; |
274 | unsigned int max_write_same_sectors; |
275 | unsigned int discard_granularity; |
276 | unsigned int discard_alignment; |
277 | |
278 | unsigned short logical_block_size; |
279 | unsigned short max_segments; |
280 | unsigned short max_integrity_segments; |
281 | |
282 | unsigned char misaligned; |
283 | unsigned char discard_misaligned; |
284 | unsigned char cluster; |
285 | unsigned char discard_zeroes_data; |
286 | }; |
287 | |
288 | struct request_queue { |
289 | /* |
290 | * Together with queue_head for cacheline sharing |
291 | */ |
292 | struct list_head queue_head; |
293 | struct request *last_merge; |
294 | struct elevator_queue *elevator; |
295 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
296 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
297 | |
298 | /* |
299 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
300 | * is used, root blkg allocates from @q->root_rl and all other |
301 | * blkgs from their own blkg->rl. Which one to use should be |
302 | * determined using bio_request_list(). |
303 | */ |
304 | struct request_list root_rl; |
305 | |
306 | request_fn_proc *request_fn; |
307 | make_request_fn *make_request_fn; |
308 | prep_rq_fn *prep_rq_fn; |
309 | unprep_rq_fn *unprep_rq_fn; |
310 | merge_bvec_fn *merge_bvec_fn; |
311 | softirq_done_fn *softirq_done_fn; |
312 | rq_timed_out_fn *rq_timed_out_fn; |
313 | dma_drain_needed_fn *dma_drain_needed; |
314 | lld_busy_fn *lld_busy_fn; |
315 | |
316 | /* |
317 | * Dispatch queue sorting |
318 | */ |
319 | sector_t end_sector; |
320 | struct request *boundary_rq; |
321 | |
322 | /* |
323 | * Delayed queue handling |
324 | */ |
325 | struct delayed_work delay_work; |
326 | |
327 | struct backing_dev_info backing_dev_info; |
328 | |
329 | /* |
330 | * The queue owner gets to use this for whatever they like. |
331 | * ll_rw_blk doesn't touch it. |
332 | */ |
333 | void *queuedata; |
334 | |
335 | /* |
336 | * various queue flags, see QUEUE_* below |
337 | */ |
338 | unsigned long queue_flags; |
339 | |
340 | /* |
341 | * ida allocated id for this queue. Used to index queues from |
342 | * ioctx. |
343 | */ |
344 | int id; |
345 | |
346 | /* |
347 | * queue needs bounce pages for pages above this limit |
348 | */ |
349 | gfp_t bounce_gfp; |
350 | |
351 | /* |
352 | * protects queue structures from reentrancy. ->__queue_lock should |
353 | * _never_ be used directly, it is queue private. always use |
354 | * ->queue_lock. |
355 | */ |
356 | spinlock_t __queue_lock; |
357 | spinlock_t *queue_lock; |
358 | |
359 | /* |
360 | * queue kobject |
361 | */ |
362 | struct kobject kobj; |
363 | |
364 | #ifdef CONFIG_PM_RUNTIME |
365 | struct device *dev; |
366 | int rpm_status; |
367 | unsigned int nr_pending; |
368 | #endif |
369 | |
370 | /* |
371 | * queue settings |
372 | */ |
373 | unsigned long nr_requests; /* Max # of requests */ |
374 | unsigned int nr_congestion_on; |
375 | unsigned int nr_congestion_off; |
376 | unsigned int nr_batching; |
377 | |
378 | unsigned int dma_drain_size; |
379 | void *dma_drain_buffer; |
380 | unsigned int dma_pad_mask; |
381 | unsigned int dma_alignment; |
382 | |
383 | struct blk_queue_tag *queue_tags; |
384 | struct list_head tag_busy_list; |
385 | |
386 | unsigned int nr_sorted; |
387 | unsigned int in_flight[2]; |
388 | /* |
389 | * Number of active block driver functions for which blk_drain_queue() |
390 | * must wait. Must be incremented around functions that unlock the |
391 | * queue_lock internally, e.g. scsi_request_fn(). |
392 | */ |
393 | unsigned int request_fn_active; |
394 | |
395 | unsigned int rq_timeout; |
396 | struct timer_list timeout; |
397 | struct list_head timeout_list; |
398 | |
399 | struct list_head icq_list; |
400 | #ifdef CONFIG_BLK_CGROUP |
401 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
402 | struct blkcg_gq *root_blkg; |
403 | struct list_head blkg_list; |
404 | #endif |
405 | |
406 | struct queue_limits limits; |
407 | |
408 | /* |
409 | * sg stuff |
410 | */ |
411 | unsigned int sg_timeout; |
412 | unsigned int sg_reserved_size; |
413 | int node; |
414 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
415 | struct blk_trace *blk_trace; |
416 | #endif |
417 | /* |
418 | * for flush operations |
419 | */ |
420 | unsigned int flush_flags; |
421 | unsigned int flush_not_queueable:1; |
422 | unsigned int flush_queue_delayed:1; |
423 | unsigned int flush_pending_idx:1; |
424 | unsigned int flush_running_idx:1; |
425 | unsigned long flush_pending_since; |
426 | struct list_head flush_queue[2]; |
427 | struct list_head flush_data_in_flight; |
428 | struct request flush_rq; |
429 | |
430 | struct mutex sysfs_lock; |
431 | |
432 | int bypass_depth; |
433 | |
434 | #if defined(CONFIG_BLK_DEV_BSG) |
435 | bsg_job_fn *bsg_job_fn; |
436 | int bsg_job_size; |
437 | struct bsg_class_device bsg_dev; |
438 | #endif |
439 | |
440 | #ifdef CONFIG_BLK_CGROUP |
441 | struct list_head all_q_node; |
442 | #endif |
443 | #ifdef CONFIG_BLK_DEV_THROTTLING |
444 | /* Throttle data */ |
445 | struct throtl_data *td; |
446 | #endif |
447 | struct rcu_head rcu_head; |
448 | }; |
449 | |
450 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
451 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ |
452 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
453 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ |
454 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
455 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
456 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
457 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
458 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
459 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
460 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ |
461 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ |
462 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
463 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
464 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ |
465 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ |
466 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ |
467 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ |
468 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
469 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
470 | |
471 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
472 | (1 << QUEUE_FLAG_STACKABLE) | \ |
473 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
474 | (1 << QUEUE_FLAG_ADD_RANDOM)) |
475 | |
476 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
477 | { |
478 | if (q->queue_lock) |
479 | lockdep_assert_held(q->queue_lock); |
480 | } |
481 | |
482 | static inline void queue_flag_set_unlocked(unsigned int flag, |
483 | struct request_queue *q) |
484 | { |
485 | __set_bit(flag, &q->queue_flags); |
486 | } |
487 | |
488 | static inline int queue_flag_test_and_clear(unsigned int flag, |
489 | struct request_queue *q) |
490 | { |
491 | queue_lockdep_assert_held(q); |
492 | |
493 | if (test_bit(flag, &q->queue_flags)) { |
494 | __clear_bit(flag, &q->queue_flags); |
495 | return 1; |
496 | } |
497 | |
498 | return 0; |
499 | } |
500 | |
501 | static inline int queue_flag_test_and_set(unsigned int flag, |
502 | struct request_queue *q) |
503 | { |
504 | queue_lockdep_assert_held(q); |
505 | |
506 | if (!test_bit(flag, &q->queue_flags)) { |
507 | __set_bit(flag, &q->queue_flags); |
508 | return 0; |
509 | } |
510 | |
511 | return 1; |
512 | } |
513 | |
514 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
515 | { |
516 | queue_lockdep_assert_held(q); |
517 | __set_bit(flag, &q->queue_flags); |
518 | } |
519 | |
520 | static inline void queue_flag_clear_unlocked(unsigned int flag, |
521 | struct request_queue *q) |
522 | { |
523 | __clear_bit(flag, &q->queue_flags); |
524 | } |
525 | |
526 | static inline int queue_in_flight(struct request_queue *q) |
527 | { |
528 | return q->in_flight[0] + q->in_flight[1]; |
529 | } |
530 | |
531 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
532 | { |
533 | queue_lockdep_assert_held(q); |
534 | __clear_bit(flag, &q->queue_flags); |
535 | } |
536 | |
537 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
538 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
539 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
540 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
541 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
542 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
543 | #define blk_queue_noxmerges(q) \ |
544 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) |
545 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
546 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
547 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
548 | #define blk_queue_stackable(q) \ |
549 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
550 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
551 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
552 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) |
553 | |
554 | #define blk_noretry_request(rq) \ |
555 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ |
556 | REQ_FAILFAST_DRIVER)) |
557 | |
558 | #define blk_account_rq(rq) \ |
559 | (((rq)->cmd_flags & REQ_STARTED) && \ |
560 | ((rq)->cmd_type == REQ_TYPE_FS)) |
561 | |
562 | #define blk_pm_request(rq) \ |
563 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
564 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) |
565 | |
566 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
567 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
568 | /* rq->queuelist of dequeued request must be list_empty() */ |
569 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) |
570 | |
571 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
572 | |
573 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
574 | |
575 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
576 | { |
577 | return q->limits.cluster; |
578 | } |
579 | |
580 | /* |
581 | * We regard a request as sync, if either a read or a sync write |
582 | */ |
583 | static inline bool rw_is_sync(unsigned int rw_flags) |
584 | { |
585 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
586 | } |
587 | |
588 | static inline bool rq_is_sync(struct request *rq) |
589 | { |
590 | return rw_is_sync(rq->cmd_flags); |
591 | } |
592 | |
593 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
594 | { |
595 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
596 | |
597 | return rl->flags & flag; |
598 | } |
599 | |
600 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
601 | { |
602 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
603 | |
604 | rl->flags |= flag; |
605 | } |
606 | |
607 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
608 | { |
609 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
610 | |
611 | rl->flags &= ~flag; |
612 | } |
613 | |
614 | static inline bool rq_mergeable(struct request *rq) |
615 | { |
616 | if (rq->cmd_type != REQ_TYPE_FS) |
617 | return false; |
618 | |
619 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
620 | return false; |
621 | |
622 | return true; |
623 | } |
624 | |
625 | static inline bool blk_check_merge_flags(unsigned int flags1, |
626 | unsigned int flags2) |
627 | { |
628 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) |
629 | return false; |
630 | |
631 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) |
632 | return false; |
633 | |
634 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
635 | return false; |
636 | |
637 | return true; |
638 | } |
639 | |
640 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
641 | { |
642 | if (bio_data(a) == bio_data(b)) |
643 | return true; |
644 | |
645 | return false; |
646 | } |
647 | |
648 | /* |
649 | * q->prep_rq_fn return values |
650 | */ |
651 | #define BLKPREP_OK 0 /* serve it */ |
652 | #define BLKPREP_KILL 1 /* fatal error, kill */ |
653 | #define BLKPREP_DEFER 2 /* leave on queue */ |
654 | |
655 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
656 | |
657 | /* |
658 | * standard bounce addresses: |
659 | * |
660 | * BLK_BOUNCE_HIGH : bounce all highmem pages |
661 | * BLK_BOUNCE_ANY : don't bounce anything |
662 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary |
663 | */ |
664 | |
665 | #if BITS_PER_LONG == 32 |
666 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
667 | #else |
668 | #define BLK_BOUNCE_HIGH -1ULL |
669 | #endif |
670 | #define BLK_BOUNCE_ANY (-1ULL) |
671 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
672 | |
673 | /* |
674 | * default timeout for SG_IO if none specified |
675 | */ |
676 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) |
677 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
678 | |
679 | #ifdef CONFIG_BOUNCE |
680 | extern int init_emergency_isa_pool(void); |
681 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
682 | #else |
683 | static inline int init_emergency_isa_pool(void) |
684 | { |
685 | return 0; |
686 | } |
687 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
688 | { |
689 | } |
690 | #endif /* CONFIG_MMU */ |
691 | |
692 | struct rq_map_data { |
693 | struct page **pages; |
694 | int page_order; |
695 | int nr_entries; |
696 | unsigned long offset; |
697 | int null_mapped; |
698 | int from_user; |
699 | }; |
700 | |
701 | struct req_iterator { |
702 | int i; |
703 | struct bio *bio; |
704 | }; |
705 | |
706 | /* This should not be used directly - use rq_for_each_segment */ |
707 | #define for_each_bio(_bio) \ |
708 | for (; _bio; _bio = _bio->bi_next) |
709 | #define __rq_for_each_bio(_bio, rq) \ |
710 | if ((rq->bio)) \ |
711 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
712 | |
713 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
714 | __rq_for_each_bio(_iter.bio, _rq) \ |
715 | bio_for_each_segment(bvl, _iter.bio, _iter.i) |
716 | |
717 | #define rq_iter_last(rq, _iter) \ |
718 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
719 | |
720 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
721 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" |
722 | #endif |
723 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
724 | extern void rq_flush_dcache_pages(struct request *rq); |
725 | #else |
726 | static inline void rq_flush_dcache_pages(struct request *rq) |
727 | { |
728 | } |
729 | #endif |
730 | |
731 | extern int blk_register_queue(struct gendisk *disk); |
732 | extern void blk_unregister_queue(struct gendisk *disk); |
733 | extern void generic_make_request(struct bio *bio); |
734 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
735 | extern void blk_put_request(struct request *); |
736 | extern void __blk_put_request(struct request_queue *, struct request *); |
737 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
738 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
739 | gfp_t); |
740 | extern void blk_requeue_request(struct request_queue *, struct request *); |
741 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
742 | unsigned int len); |
743 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
744 | extern int blk_lld_busy(struct request_queue *q); |
745 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
746 | struct bio_set *bs, gfp_t gfp_mask, |
747 | int (*bio_ctr)(struct bio *, struct bio *, void *), |
748 | void *data); |
749 | extern void blk_rq_unprep_clone(struct request *rq); |
750 | extern int blk_insert_cloned_request(struct request_queue *q, |
751 | struct request *rq); |
752 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
753 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
754 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
755 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
756 | unsigned int, void __user *); |
757 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
758 | unsigned int, void __user *); |
759 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
760 | struct scsi_ioctl_command __user *); |
761 | |
762 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
763 | |
764 | /* |
765 | * A queue has just exitted congestion. Note this in the global counter of |
766 | * congested queues, and wake up anyone who was waiting for requests to be |
767 | * put back. |
768 | */ |
769 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
770 | { |
771 | clear_bdi_congested(&q->backing_dev_info, sync); |
772 | } |
773 | |
774 | /* |
775 | * A queue has just entered congestion. Flag that in the queue's VM-visible |
776 | * state flags and increment the global gounter of congested queues. |
777 | */ |
778 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
779 | { |
780 | set_bdi_congested(&q->backing_dev_info, sync); |
781 | } |
782 | |
783 | extern void blk_start_queue(struct request_queue *q); |
784 | extern void blk_stop_queue(struct request_queue *q); |
785 | extern void blk_sync_queue(struct request_queue *q); |
786 | extern void __blk_stop_queue(struct request_queue *q); |
787 | extern void __blk_run_queue(struct request_queue *q); |
788 | extern void blk_run_queue(struct request_queue *); |
789 | extern void blk_run_queue_async(struct request_queue *q); |
790 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
791 | struct rq_map_data *, void __user *, unsigned long, |
792 | gfp_t); |
793 | extern int blk_rq_unmap_user(struct bio *); |
794 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
795 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, |
796 | struct rq_map_data *, struct sg_iovec *, int, |
797 | unsigned int, gfp_t); |
798 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
799 | struct request *, int); |
800 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
801 | struct request *, int, rq_end_io_fn *); |
802 | |
803 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
804 | { |
805 | return bdev->bd_disk->queue; |
806 | } |
807 | |
808 | /* |
809 | * blk_rq_pos() : the current sector |
810 | * blk_rq_bytes() : bytes left in the entire request |
811 | * blk_rq_cur_bytes() : bytes left in the current segment |
812 | * blk_rq_err_bytes() : bytes left till the next error boundary |
813 | * blk_rq_sectors() : sectors left in the entire request |
814 | * blk_rq_cur_sectors() : sectors left in the current segment |
815 | */ |
816 | static inline sector_t blk_rq_pos(const struct request *rq) |
817 | { |
818 | return rq->__sector; |
819 | } |
820 | |
821 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
822 | { |
823 | return rq->__data_len; |
824 | } |
825 | |
826 | static inline int blk_rq_cur_bytes(const struct request *rq) |
827 | { |
828 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; |
829 | } |
830 | |
831 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
832 | |
833 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
834 | { |
835 | return blk_rq_bytes(rq) >> 9; |
836 | } |
837 | |
838 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
839 | { |
840 | return blk_rq_cur_bytes(rq) >> 9; |
841 | } |
842 | |
843 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
844 | unsigned int cmd_flags) |
845 | { |
846 | if (unlikely(cmd_flags & REQ_DISCARD)) |
847 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
848 | |
849 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
850 | return q->limits.max_write_same_sectors; |
851 | |
852 | return q->limits.max_sectors; |
853 | } |
854 | |
855 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
856 | { |
857 | struct request_queue *q = rq->q; |
858 | |
859 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) |
860 | return q->limits.max_hw_sectors; |
861 | |
862 | return blk_queue_get_max_sectors(q, rq->cmd_flags); |
863 | } |
864 | |
865 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
866 | { |
867 | unsigned int nr_bios = 0; |
868 | struct bio *bio; |
869 | |
870 | __rq_for_each_bio(bio, rq) |
871 | nr_bios++; |
872 | |
873 | return nr_bios; |
874 | } |
875 | |
876 | /* |
877 | * Request issue related functions. |
878 | */ |
879 | extern struct request *blk_peek_request(struct request_queue *q); |
880 | extern void blk_start_request(struct request *rq); |
881 | extern struct request *blk_fetch_request(struct request_queue *q); |
882 | |
883 | /* |
884 | * Request completion related functions. |
885 | * |
886 | * blk_update_request() completes given number of bytes and updates |
887 | * the request without completing it. |
888 | * |
889 | * blk_end_request() and friends. __blk_end_request() must be called |
890 | * with the request queue spinlock acquired. |
891 | * |
892 | * Several drivers define their own end_request and call |
893 | * blk_end_request() for parts of the original function. |
894 | * This prevents code duplication in drivers. |
895 | */ |
896 | extern bool blk_update_request(struct request *rq, int error, |
897 | unsigned int nr_bytes); |
898 | extern bool blk_end_request(struct request *rq, int error, |
899 | unsigned int nr_bytes); |
900 | extern void blk_end_request_all(struct request *rq, int error); |
901 | extern bool blk_end_request_cur(struct request *rq, int error); |
902 | extern bool blk_end_request_err(struct request *rq, int error); |
903 | extern bool __blk_end_request(struct request *rq, int error, |
904 | unsigned int nr_bytes); |
905 | extern void __blk_end_request_all(struct request *rq, int error); |
906 | extern bool __blk_end_request_cur(struct request *rq, int error); |
907 | extern bool __blk_end_request_err(struct request *rq, int error); |
908 | |
909 | extern void blk_complete_request(struct request *); |
910 | extern void __blk_complete_request(struct request *); |
911 | extern void blk_abort_request(struct request *); |
912 | extern void blk_unprep_request(struct request *); |
913 | |
914 | /* |
915 | * Access functions for manipulating queue properties |
916 | */ |
917 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
918 | spinlock_t *lock, int node_id); |
919 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
920 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
921 | request_fn_proc *, spinlock_t *); |
922 | extern void blk_cleanup_queue(struct request_queue *); |
923 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); |
924 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
925 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
926 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
927 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
928 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
929 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
930 | unsigned int max_discard_sectors); |
931 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
932 | unsigned int max_write_same_sectors); |
933 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
934 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
935 | extern void blk_queue_alignment_offset(struct request_queue *q, |
936 | unsigned int alignment); |
937 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
938 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
939 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
940 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
941 | extern void blk_set_default_limits(struct queue_limits *lim); |
942 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
943 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
944 | sector_t offset); |
945 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
946 | sector_t offset); |
947 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
948 | sector_t offset); |
949 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
950 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
951 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
952 | extern int blk_queue_dma_drain(struct request_queue *q, |
953 | dma_drain_needed_fn *dma_drain_needed, |
954 | void *buf, unsigned int size); |
955 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
956 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
957 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
958 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
959 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
960 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
961 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
962 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
963 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
964 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
965 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
966 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
967 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
968 | |
969 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
970 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
971 | struct scatterlist *sglist); |
972 | extern void blk_dump_rq_flags(struct request *, char *); |
973 | extern long nr_blockdev_pages(void); |
974 | |
975 | bool __must_check blk_get_queue(struct request_queue *); |
976 | struct request_queue *blk_alloc_queue(gfp_t); |
977 | struct request_queue *blk_alloc_queue_node(gfp_t, int); |
978 | extern void blk_put_queue(struct request_queue *); |
979 | |
980 | /* |
981 | * block layer runtime pm functions |
982 | */ |
983 | #ifdef CONFIG_PM_RUNTIME |
984 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
985 | extern int blk_pre_runtime_suspend(struct request_queue *q); |
986 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); |
987 | extern void blk_pre_runtime_resume(struct request_queue *q); |
988 | extern void blk_post_runtime_resume(struct request_queue *q, int err); |
989 | #else |
990 | static inline void blk_pm_runtime_init(struct request_queue *q, |
991 | struct device *dev) {} |
992 | static inline int blk_pre_runtime_suspend(struct request_queue *q) |
993 | { |
994 | return -ENOSYS; |
995 | } |
996 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} |
997 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} |
998 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} |
999 | #endif |
1000 | |
1001 | /* |
1002 | * blk_plug permits building a queue of related requests by holding the I/O |
1003 | * fragments for a short period. This allows merging of sequential requests |
1004 | * into single larger request. As the requests are moved from a per-task list to |
1005 | * the device's request_queue in a batch, this results in improved scalability |
1006 | * as the lock contention for request_queue lock is reduced. |
1007 | * |
1008 | * It is ok not to disable preemption when adding the request to the plug list |
1009 | * or when attempting a merge, because blk_schedule_flush_list() will only flush |
1010 | * the plug list when the task sleeps by itself. For details, please see |
1011 | * schedule() where blk_schedule_flush_plug() is called. |
1012 | */ |
1013 | struct blk_plug { |
1014 | unsigned long magic; /* detect uninitialized use-cases */ |
1015 | struct list_head list; /* requests */ |
1016 | struct list_head cb_list; /* md requires an unplug callback */ |
1017 | }; |
1018 | #define BLK_MAX_REQUEST_COUNT 16 |
1019 | |
1020 | struct blk_plug_cb; |
1021 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
1022 | struct blk_plug_cb { |
1023 | struct list_head list; |
1024 | blk_plug_cb_fn callback; |
1025 | void *data; |
1026 | }; |
1027 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1028 | void *data, int size); |
1029 | extern void blk_start_plug(struct blk_plug *); |
1030 | extern void blk_finish_plug(struct blk_plug *); |
1031 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
1032 | |
1033 | static inline void blk_flush_plug(struct task_struct *tsk) |
1034 | { |
1035 | struct blk_plug *plug = tsk->plug; |
1036 | |
1037 | if (plug) |
1038 | blk_flush_plug_list(plug, false); |
1039 | } |
1040 | |
1041 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) |
1042 | { |
1043 | struct blk_plug *plug = tsk->plug; |
1044 | |
1045 | if (plug) |
1046 | blk_flush_plug_list(plug, true); |
1047 | } |
1048 | |
1049 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1050 | { |
1051 | struct blk_plug *plug = tsk->plug; |
1052 | |
1053 | return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); |
1054 | } |
1055 | |
1056 | /* |
1057 | * tag stuff |
1058 | */ |
1059 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
1060 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1061 | extern struct request *blk_queue_find_tag(struct request_queue *, int); |
1062 | extern void blk_queue_end_tag(struct request_queue *, struct request *); |
1063 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); |
1064 | extern void blk_queue_free_tags(struct request_queue *); |
1065 | extern int blk_queue_resize_tags(struct request_queue *, int); |
1066 | extern void blk_queue_invalidate_tags(struct request_queue *); |
1067 | extern struct blk_queue_tag *blk_init_tags(int); |
1068 | extern void blk_free_tags(struct blk_queue_tag *); |
1069 | |
1070 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1071 | int tag) |
1072 | { |
1073 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) |
1074 | return NULL; |
1075 | return bqt->tag_index[tag]; |
1076 | } |
1077 | |
1078 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ |
1079 | |
1080 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1081 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1082 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); |
1083 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1084 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); |
1085 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1086 | sector_t nr_sects, gfp_t gfp_mask); |
1087 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1088 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) |
1089 | { |
1090 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1091 | nr_blocks << (sb->s_blocksize_bits - 9), |
1092 | gfp_mask, flags); |
1093 | } |
1094 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
1095 | sector_t nr_blocks, gfp_t gfp_mask) |
1096 | { |
1097 | return blkdev_issue_zeroout(sb->s_bdev, |
1098 | block << (sb->s_blocksize_bits - 9), |
1099 | nr_blocks << (sb->s_blocksize_bits - 9), |
1100 | gfp_mask); |
1101 | } |
1102 | |
1103 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
1104 | |
1105 | enum blk_default_limits { |
1106 | BLK_MAX_SEGMENTS = 128, |
1107 | BLK_SAFE_MAX_SECTORS = 255, |
1108 | BLK_DEF_MAX_SECTORS = 1024, |
1109 | BLK_MAX_SEGMENT_SIZE = 65536, |
1110 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, |
1111 | }; |
1112 | |
1113 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1114 | |
1115 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1116 | { |
1117 | return q->limits.bounce_pfn; |
1118 | } |
1119 | |
1120 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
1121 | { |
1122 | return q->limits.seg_boundary_mask; |
1123 | } |
1124 | |
1125 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1126 | { |
1127 | return q->limits.max_sectors; |
1128 | } |
1129 | |
1130 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) |
1131 | { |
1132 | return q->limits.max_hw_sectors; |
1133 | } |
1134 | |
1135 | static inline unsigned short queue_max_segments(struct request_queue *q) |
1136 | { |
1137 | return q->limits.max_segments; |
1138 | } |
1139 | |
1140 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
1141 | { |
1142 | return q->limits.max_segment_size; |
1143 | } |
1144 | |
1145 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1146 | { |
1147 | int retval = 512; |
1148 | |
1149 | if (q && q->limits.logical_block_size) |
1150 | retval = q->limits.logical_block_size; |
1151 | |
1152 | return retval; |
1153 | } |
1154 | |
1155 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1156 | { |
1157 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1158 | } |
1159 | |
1160 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1161 | { |
1162 | return q->limits.physical_block_size; |
1163 | } |
1164 | |
1165 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
1166 | { |
1167 | return queue_physical_block_size(bdev_get_queue(bdev)); |
1168 | } |
1169 | |
1170 | static inline unsigned int queue_io_min(struct request_queue *q) |
1171 | { |
1172 | return q->limits.io_min; |
1173 | } |
1174 | |
1175 | static inline int bdev_io_min(struct block_device *bdev) |
1176 | { |
1177 | return queue_io_min(bdev_get_queue(bdev)); |
1178 | } |
1179 | |
1180 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1181 | { |
1182 | return q->limits.io_opt; |
1183 | } |
1184 | |
1185 | static inline int bdev_io_opt(struct block_device *bdev) |
1186 | { |
1187 | return queue_io_opt(bdev_get_queue(bdev)); |
1188 | } |
1189 | |
1190 | static inline int queue_alignment_offset(struct request_queue *q) |
1191 | { |
1192 | if (q->limits.misaligned) |
1193 | return -1; |
1194 | |
1195 | return q->limits.alignment_offset; |
1196 | } |
1197 | |
1198 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
1199 | { |
1200 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
1201 | unsigned int alignment = (sector << 9) & (granularity - 1); |
1202 | |
1203 | return (granularity + lim->alignment_offset - alignment) |
1204 | & (granularity - 1); |
1205 | } |
1206 | |
1207 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1208 | { |
1209 | struct request_queue *q = bdev_get_queue(bdev); |
1210 | |
1211 | if (q->limits.misaligned) |
1212 | return -1; |
1213 | |
1214 | if (bdev != bdev->bd_contains) |
1215 | return bdev->bd_part->alignment_offset; |
1216 | |
1217 | return q->limits.alignment_offset; |
1218 | } |
1219 | |
1220 | static inline int queue_discard_alignment(struct request_queue *q) |
1221 | { |
1222 | if (q->limits.discard_misaligned) |
1223 | return -1; |
1224 | |
1225 | return q->limits.discard_alignment; |
1226 | } |
1227 | |
1228 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
1229 | { |
1230 | unsigned int alignment, granularity, offset; |
1231 | |
1232 | if (!lim->max_discard_sectors) |
1233 | return 0; |
1234 | |
1235 | /* Why are these in bytes, not sectors? */ |
1236 | alignment = lim->discard_alignment >> 9; |
1237 | granularity = lim->discard_granularity >> 9; |
1238 | if (!granularity) |
1239 | return 0; |
1240 | |
1241 | /* Offset of the partition start in 'granularity' sectors */ |
1242 | offset = sector_div(sector, granularity); |
1243 | |
1244 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
1245 | offset = (granularity + alignment - offset) % granularity; |
1246 | |
1247 | /* Turn it back into bytes, gaah */ |
1248 | return offset << 9; |
1249 | } |
1250 | |
1251 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1252 | { |
1253 | struct request_queue *q = bdev_get_queue(bdev); |
1254 | |
1255 | if (bdev != bdev->bd_contains) |
1256 | return bdev->bd_part->discard_alignment; |
1257 | |
1258 | return q->limits.discard_alignment; |
1259 | } |
1260 | |
1261 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1262 | { |
1263 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
1264 | return 1; |
1265 | |
1266 | return 0; |
1267 | } |
1268 | |
1269 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) |
1270 | { |
1271 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); |
1272 | } |
1273 | |
1274 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1275 | { |
1276 | struct request_queue *q = bdev_get_queue(bdev); |
1277 | |
1278 | if (q) |
1279 | return q->limits.max_write_same_sectors; |
1280 | |
1281 | return 0; |
1282 | } |
1283 | |
1284 | static inline int queue_dma_alignment(struct request_queue *q) |
1285 | { |
1286 | return q ? q->dma_alignment : 511; |
1287 | } |
1288 | |
1289 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
1290 | unsigned int len) |
1291 | { |
1292 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
1293 | return !(addr & alignment) && !(len & alignment); |
1294 | } |
1295 | |
1296 | /* assumes size > 256 */ |
1297 | static inline unsigned int blksize_bits(unsigned int size) |
1298 | { |
1299 | unsigned int bits = 8; |
1300 | do { |
1301 | bits++; |
1302 | size >>= 1; |
1303 | } while (size > 256); |
1304 | return bits; |
1305 | } |
1306 | |
1307 | static inline unsigned int block_size(struct block_device *bdev) |
1308 | { |
1309 | return bdev->bd_block_size; |
1310 | } |
1311 | |
1312 | static inline bool queue_flush_queueable(struct request_queue *q) |
1313 | { |
1314 | return !q->flush_not_queueable; |
1315 | } |
1316 | |
1317 | typedef struct {struct page *v;} Sector; |
1318 | |
1319 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |
1320 | |
1321 | static inline void put_dev_sector(Sector p) |
1322 | { |
1323 | page_cache_release(p.v); |
1324 | } |
1325 | |
1326 | struct work_struct; |
1327 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1328 | |
1329 | #ifdef CONFIG_BLK_CGROUP |
1330 | /* |
1331 | * This should not be using sched_clock(). A real patch is in progress |
1332 | * to fix this up, until that is in place we need to disable preemption |
1333 | * around sched_clock() in this function and set_io_start_time_ns(). |
1334 | */ |
1335 | static inline void set_start_time_ns(struct request *req) |
1336 | { |
1337 | preempt_disable(); |
1338 | req->start_time_ns = sched_clock(); |
1339 | preempt_enable(); |
1340 | } |
1341 | |
1342 | static inline void set_io_start_time_ns(struct request *req) |
1343 | { |
1344 | preempt_disable(); |
1345 | req->io_start_time_ns = sched_clock(); |
1346 | preempt_enable(); |
1347 | } |
1348 | |
1349 | static inline uint64_t rq_start_time_ns(struct request *req) |
1350 | { |
1351 | return req->start_time_ns; |
1352 | } |
1353 | |
1354 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
1355 | { |
1356 | return req->io_start_time_ns; |
1357 | } |
1358 | #else |
1359 | static inline void set_start_time_ns(struct request *req) {} |
1360 | static inline void set_io_start_time_ns(struct request *req) {} |
1361 | static inline uint64_t rq_start_time_ns(struct request *req) |
1362 | { |
1363 | return 0; |
1364 | } |
1365 | static inline uint64_t rq_io_start_time_ns(struct request *req) |
1366 | { |
1367 | return 0; |
1368 | } |
1369 | #endif |
1370 | |
1371 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1372 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) |
1373 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ |
1374 | MODULE_ALIAS("block-major-" __stringify(major) "-*") |
1375 | |
1376 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1377 | |
1378 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1379 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
1380 | |
1381 | struct blk_integrity_exchg { |
1382 | void *prot_buf; |
1383 | void *data_buf; |
1384 | sector_t sector; |
1385 | unsigned int data_size; |
1386 | unsigned short sector_size; |
1387 | const char *disk_name; |
1388 | }; |
1389 | |
1390 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
1391 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
1392 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
1393 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
1394 | |
1395 | struct blk_integrity { |
1396 | integrity_gen_fn *generate_fn; |
1397 | integrity_vrfy_fn *verify_fn; |
1398 | integrity_set_tag_fn *set_tag_fn; |
1399 | integrity_get_tag_fn *get_tag_fn; |
1400 | |
1401 | unsigned short flags; |
1402 | unsigned short tuple_size; |
1403 | unsigned short sector_size; |
1404 | unsigned short tag_size; |
1405 | |
1406 | const char *name; |
1407 | |
1408 | struct kobject kobj; |
1409 | }; |
1410 | |
1411 | extern bool blk_integrity_is_initialized(struct gendisk *); |
1412 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1413 | extern void blk_integrity_unregister(struct gendisk *); |
1414 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
1415 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1416 | struct scatterlist *); |
1417 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); |
1418 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, |
1419 | struct request *); |
1420 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, |
1421 | struct bio *); |
1422 | |
1423 | static inline |
1424 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
1425 | { |
1426 | return bdev->bd_disk->integrity; |
1427 | } |
1428 | |
1429 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1430 | { |
1431 | return disk->integrity; |
1432 | } |
1433 | |
1434 | static inline int blk_integrity_rq(struct request *rq) |
1435 | { |
1436 | if (rq->bio == NULL) |
1437 | return 0; |
1438 | |
1439 | return bio_integrity(rq->bio); |
1440 | } |
1441 | |
1442 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1443 | unsigned int segs) |
1444 | { |
1445 | q->limits.max_integrity_segments = segs; |
1446 | } |
1447 | |
1448 | static inline unsigned short |
1449 | queue_max_integrity_segments(struct request_queue *q) |
1450 | { |
1451 | return q->limits.max_integrity_segments; |
1452 | } |
1453 | |
1454 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1455 | |
1456 | struct bio; |
1457 | struct block_device; |
1458 | struct gendisk; |
1459 | struct blk_integrity; |
1460 | |
1461 | static inline int blk_integrity_rq(struct request *rq) |
1462 | { |
1463 | return 0; |
1464 | } |
1465 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, |
1466 | struct bio *b) |
1467 | { |
1468 | return 0; |
1469 | } |
1470 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, |
1471 | struct bio *b, |
1472 | struct scatterlist *s) |
1473 | { |
1474 | return 0; |
1475 | } |
1476 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) |
1477 | { |
1478 | return 0; |
1479 | } |
1480 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1481 | { |
1482 | return NULL; |
1483 | } |
1484 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
1485 | { |
1486 | return 0; |
1487 | } |
1488 | static inline int blk_integrity_register(struct gendisk *d, |
1489 | struct blk_integrity *b) |
1490 | { |
1491 | return 0; |
1492 | } |
1493 | static inline void blk_integrity_unregister(struct gendisk *d) |
1494 | { |
1495 | } |
1496 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1497 | unsigned int segs) |
1498 | { |
1499 | } |
1500 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) |
1501 | { |
1502 | return 0; |
1503 | } |
1504 | static inline int blk_integrity_merge_rq(struct request_queue *rq, |
1505 | struct request *r1, |
1506 | struct request *r2) |
1507 | { |
1508 | return 0; |
1509 | } |
1510 | static inline int blk_integrity_merge_bio(struct request_queue *rq, |
1511 | struct request *r, |
1512 | struct bio *b) |
1513 | { |
1514 | return 0; |
1515 | } |
1516 | static inline bool blk_integrity_is_initialized(struct gendisk *g) |
1517 | { |
1518 | return 0; |
1519 | } |
1520 | |
1521 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1522 | |
1523 | struct block_device_operations { |
1524 | int (*open) (struct block_device *, fmode_t); |
1525 | void (*release) (struct gendisk *, fmode_t); |
1526 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1527 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1528 | int (*direct_access) (struct block_device *, sector_t, |
1529 | void **, unsigned long *); |
1530 | unsigned int (*check_events) (struct gendisk *disk, |
1531 | unsigned int clearing); |
1532 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ |
1533 | int (*media_changed) (struct gendisk *); |
1534 | void (*unlock_native_capacity) (struct gendisk *); |
1535 | int (*revalidate_disk) (struct gendisk *); |
1536 | int (*getgeo)(struct block_device *, struct hd_geometry *); |
1537 | /* this callback is with swap_lock and sometimes page table lock held */ |
1538 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); |
1539 | struct module *owner; |
1540 | }; |
1541 | |
1542 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1543 | unsigned long); |
1544 | #else /* CONFIG_BLOCK */ |
1545 | /* |
1546 | * stubs for when the block layer is configured out |
1547 | */ |
1548 | #define buffer_heads_over_limit 0 |
1549 | |
1550 | static inline long nr_blockdev_pages(void) |
1551 | { |
1552 | return 0; |
1553 | } |
1554 | |
1555 | struct blk_plug { |
1556 | }; |
1557 | |
1558 | static inline void blk_start_plug(struct blk_plug *plug) |
1559 | { |
1560 | } |
1561 | |
1562 | static inline void blk_finish_plug(struct blk_plug *plug) |
1563 | { |
1564 | } |
1565 | |
1566 | static inline void blk_flush_plug(struct task_struct *task) |
1567 | { |
1568 | } |
1569 | |
1570 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1571 | { |
1572 | } |
1573 | |
1574 | |
1575 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1576 | { |
1577 | return false; |
1578 | } |
1579 | |
1580 | #endif /* CONFIG_BLOCK */ |
1581 | |
1582 | #endif |
1583 |
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