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